4761 lines
154 KiB
C
4761 lines
154 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "mdns.h"
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#include "mdns_private.h"
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#include "mdns_networking.h"
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#include <string.h>
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#ifdef MDNS_ENABLE_DEBUG
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void mdns_debug_packet(const uint8_t * data, size_t len);
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#endif
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static const char * MDNS_DEFAULT_DOMAIN = "local";
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static const char * MDNS_SUB_STR = "_sub";
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mdns_server_t * _mdns_server = NULL;
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static volatile TaskHandle_t _mdns_service_task_handle = NULL;
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static SemaphoreHandle_t _mdns_service_semaphore = NULL;
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static void _mdns_search_finish_done();
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static mdns_search_once_t * _mdns_search_find_from(mdns_search_once_t * search, mdns_name_t * name, uint16_t type, tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol);
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static void _mdns_search_result_add_ip(mdns_search_once_t * search, const char * hostname, ip_addr_t * ip, tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol);
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static void _mdns_search_result_add_srv(mdns_search_once_t * search, const char * hostname, uint16_t port, tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol);
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static void _mdns_search_result_add_txt(mdns_search_once_t * search, mdns_txt_item_t * txt, size_t txt_count, tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol);
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static mdns_result_t * _mdns_search_result_add_ptr(mdns_search_once_t * search, const char * instance, tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol);
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static inline bool _str_null_or_empty(const char * str){
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return (str == NULL || *str == 0);
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}
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/*
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* @brief Appends/increments a number to name/instance in case of collision
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* */
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static char * _mdns_mangle_name(char* in) {
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char *p = strrchr(in, '-');
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int suffix = 0;
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if (p == NULL) {
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//No - in ``in``
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suffix = 2;
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} else {
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char *endp = NULL;
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suffix = strtol(p + 1, &endp, 10);
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if (*endp != 0) {
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//suffix is not numerical
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suffix = 2;
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p = NULL; //so we append -suffix to the entire string
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}
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}
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char *ret;
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if (p == NULL) {
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//need to add -2 to string
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ret = malloc(strlen(in) + 3);
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if (ret == NULL) {
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return NULL;
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}
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sprintf(ret, "%s-2", in);
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} else {
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ret = malloc(strlen(in) + 2); //one extra byte in case 9-10 or 99-100 etc
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strcpy(ret, in);
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int baseLen = p - in; //length of 'bla' in 'bla-123'
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//overwrite suffix with new suffix
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sprintf(ret + baseLen, "-%d", suffix + 1);
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}
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return ret;
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}
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/**
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* @brief finds service from given service type
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* @param server the server
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* @param service service type to match
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* @param proto proto to match
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*
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* @return the service item if found or NULL on error
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*/
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static mdns_srv_item_t * _mdns_get_service_item(const char * service, const char * proto)
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{
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mdns_srv_item_t * s = _mdns_server->services;
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while (s) {
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if (!strcasecmp(s->service->service, service) && !strcasecmp(s->service->proto, proto)) {
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return s;
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}
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s = s->next;
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}
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return NULL;
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}
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esp_err_t _mdns_send_rx_action(mdns_rx_packet_t * packet)
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{
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mdns_action_t * action = NULL;
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action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
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if (!action) {
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return ESP_ERR_NO_MEM;
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}
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action->type = ACTION_RX_HANDLE;
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action->data.rx_handle.packet = packet;
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if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
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free(action);
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return ESP_ERR_NO_MEM;
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}
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return ESP_OK;
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}
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/**
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* @brief Get the service name of a service
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*/
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static const char * _mdns_get_service_instance_name(mdns_service_t * service)
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{
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if (service && !_str_null_or_empty(service->instance)) {
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return service->instance;
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}
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if (_mdns_server && !_str_null_or_empty(_mdns_server->instance)) {
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return _mdns_server->instance;
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}
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if (_mdns_server && !_str_null_or_empty(_mdns_server->hostname)) {
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return _mdns_server->hostname;
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}
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return NULL;
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}
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/**
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* @brief reads MDNS FQDN into mdns_name_t structure
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* FQDN is in format: [hostname.|[instance.]_service._proto.]local.
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*
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* @param packet MDNS packet
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* @param start Starting point of FQDN
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* @param name mdns_name_t structure to populate
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* @param buf temporary char buffer
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*
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* @return the address after the parsed FQDN in the packet or NULL on error
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*/
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static const uint8_t * _mdns_read_fqdn(const uint8_t * packet, const uint8_t * start, mdns_name_t * name, char * buf)
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{
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size_t index = 0;
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while (start[index]) {
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if (name->parts == 4) {
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return NULL;
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}
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uint8_t len = start[index++];
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if (len < 0xC0) {
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if (len > 63) {
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//length can not be more than 63
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return NULL;
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}
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uint8_t i;
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for (i=0; i<len; i++) {
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buf[i] = start[index++];
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}
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buf[len] = '\0';
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if (name->parts == 1 && buf[0] != '_'
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&& (strcasecmp(buf, MDNS_DEFAULT_DOMAIN) != 0)
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&& (strcasecmp(buf, "ip6") != 0)
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&& (strcasecmp(buf, "in-addr") != 0)) {
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strlcat(name->host, ".", sizeof(name->host));
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strlcat(name->host, buf, sizeof(name->host));
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} else if (strcasecmp(buf, MDNS_SUB_STR) == 0) {
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name->sub = 1;
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} else {
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char* mdns_name_ptrs[]={name->host, name->service, name->proto, name->domain};
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memcpy(mdns_name_ptrs[name->parts++], buf, len+1);
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}
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} else {
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size_t address = (((uint16_t)len & 0x3F) << 8) | start[index++];
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if ((packet + address) >= start) {
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//reference address can not be after where we are
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return NULL;
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}
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if (_mdns_read_fqdn(packet, packet + address, name, buf)) {
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return start + index;
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}
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return NULL;
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}
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}
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return start + index + 1;
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}
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/**
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* @brief sets uint16_t value in a packet
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*
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* @param packet MDNS packet
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* @param index offset of uint16_t value
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* @param value the value to set
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*/
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static inline void _mdns_set_u16(uint8_t * packet, uint16_t index, uint16_t value)
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{
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if ((index + 1) >= MDNS_MAX_PACKET_SIZE) {
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return;
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}
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packet[index] = (value >> 8) & 0xFF;
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packet[index+1] = value & 0xFF;
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}
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/**
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* @brief appends byte in a packet, incrementing the index
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*
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* @param packet MDNS packet
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* @param index offset in the packet
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* @param value the value to set
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*
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* @return length of added data: 0 on error or 1 on success
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*/
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static inline uint8_t _mdns_append_u8(uint8_t * packet, uint16_t * index, uint8_t value)
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{
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if (*index >= MDNS_MAX_PACKET_SIZE) {
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return 0;
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}
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packet[*index] = value;
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*index += 1;
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return 1;
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}
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/**
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* @brief appends uint16_t in a packet, incrementing the index
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*
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* @param packet MDNS packet
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* @param index offset in the packet
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* @param value the value to set
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*
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* @return length of added data: 0 on error or 2 on success
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*/
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static inline uint8_t _mdns_append_u16(uint8_t * packet, uint16_t * index, uint16_t value)
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{
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if ((*index + 1) >= MDNS_MAX_PACKET_SIZE) {
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return 0;
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}
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_mdns_append_u8(packet, index, (value >> 8) & 0xFF);
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_mdns_append_u8(packet, index, value & 0xFF);
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return 2;
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}
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/**
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* @brief appends uint32_t in a packet, incrementing the index
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*
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* @param packet MDNS packet
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* @param index offset in the packet
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* @param value the value to set
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*
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* @return length of added data: 0 on error or 4 on success
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*/
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static inline uint8_t _mdns_append_u32(uint8_t * packet, uint16_t * index, uint32_t value)
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{
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if ((*index + 3) >= MDNS_MAX_PACKET_SIZE) {
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return 0;
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}
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_mdns_append_u8(packet, index, (value >> 24) & 0xFF);
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_mdns_append_u8(packet, index, (value >> 16) & 0xFF);
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_mdns_append_u8(packet, index, (value >> 8) & 0xFF);
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_mdns_append_u8(packet, index, value & 0xFF);
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return 4;
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}
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/**
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* @brief appends answer type, class, ttl and data length to a packet, incrementing the index
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*
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* @param packet MDNS packet
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* @param index offset in the packet
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* @param type answer type
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* @param ttl answer ttl
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*
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* @return length of added data: 0 on error or 10 on success
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*/
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static inline uint8_t _mdns_append_type(uint8_t * packet, uint16_t * index, uint8_t type, bool flush, uint32_t ttl)
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{
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if ((*index + 10) >= MDNS_MAX_PACKET_SIZE) {
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return 0;
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}
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uint16_t clas = MDNS_CLASS_IN;
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if (flush) {
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clas = MDNS_CLASS_IN_FLUSH_CACHE;
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}
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if (type == MDNS_ANSWER_PTR) {
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_mdns_append_u16(packet, index, MDNS_TYPE_PTR);
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_mdns_append_u16(packet, index, clas);
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} else if (type == MDNS_ANSWER_TXT) {
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_mdns_append_u16(packet, index, MDNS_TYPE_TXT);
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_mdns_append_u16(packet, index, clas);
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} else if (type == MDNS_ANSWER_SRV) {
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_mdns_append_u16(packet, index, MDNS_TYPE_SRV);
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_mdns_append_u16(packet, index, clas);
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} else if (type == MDNS_ANSWER_A) {
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_mdns_append_u16(packet, index, MDNS_TYPE_A);
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_mdns_append_u16(packet, index, clas);
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} else if (type == MDNS_ANSWER_AAAA) {
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_mdns_append_u16(packet, index, MDNS_TYPE_AAAA);
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_mdns_append_u16(packet, index, clas);
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} else {
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return 0;
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}
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_mdns_append_u32(packet, index, ttl);
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_mdns_append_u16(packet, index, 0);
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return 10;
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}
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/**
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* @brief appends single string to a packet, incrementing the index
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*
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* @param packet MDNS packet
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* @param index offset in the packet
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* @param string the string to append
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*
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* @return length of added data: 0 on error or length of the string + 1 on success
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*/
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static inline uint8_t _mdns_append_string(uint8_t * packet, uint16_t * index, const char * string)
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{
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uint8_t len = strlen(string);
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if ((*index + len + 1) >= MDNS_MAX_PACKET_SIZE) {
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return 0;
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}
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_mdns_append_u8(packet, index, len);
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memcpy(packet + *index, string, len);
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*index += len;
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return len + 1;
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}
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/**
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* @brief appends FQDN to a packet, incrementing the index and
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* compressing the output if previous occurrence of the string (or part of it) has been found
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*
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* @param packet MDNS packet
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* @param index offset in the packet
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* @param strings string array containing the parts of the FQDN
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* @param count number of strings in the array
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*
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* @return length of added data: 0 on error or length on success
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*/
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static uint16_t _mdns_append_fqdn(uint8_t * packet, uint16_t * index, const char * strings[], uint8_t count)
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{
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if (!count) {
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//empty string so terminate
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return _mdns_append_u8(packet, index, 0);
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}
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mdns_name_t name;
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static char buf[MDNS_NAME_BUF_LEN];
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uint8_t len = strlen(strings[0]);
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//try to find first the string length in the packet (if it exists)
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uint8_t * len_location = (uint8_t *)memchr(packet, (char)len, *index);
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while (len_location) {
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//check if the string after len_location is the string that we are looking for
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if (memcmp(len_location+1, strings[0], len)) { //not continuing with our string
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search_next:
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//try and find the length byte further in the packet
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len_location = (uint8_t *)memchr(len_location+1, (char)len, *index - (len_location+1 - packet));
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continue;
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}
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//seems that we might have found the string that we are looking for
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//read the destination into name and compare
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name.parts = 0;
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name.sub = 0;
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name.host[0] = 0;
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name.service[0] = 0;
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name.proto[0] = 0;
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name.domain[0] = 0;
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const uint8_t * content = _mdns_read_fqdn(packet, len_location, &name, buf);
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if (!content) {
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//not a readable fqdn?
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return 0;
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}
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if (name.parts == count) {
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uint8_t i;
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for (i=0; i<count; i++) {
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if (strcasecmp(strings[i], (const char *)&name + (i * (MDNS_NAME_BUF_LEN)))) {
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//not our string! let's search more
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goto search_next;
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}
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}
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//we actually have found the string
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break;
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} else {
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goto search_next;
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}
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}
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//string is not yet in the packet, so let's add it
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if (!len_location) {
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uint8_t written = _mdns_append_string(packet, index, strings[0]);
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if (!written) {
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return 0;
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}
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//run the same for the other strings in the name
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return written + _mdns_append_fqdn(packet, index, &strings[1], count - 1);
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}
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//we have found the string so let's insert a pointer to it instead
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uint16_t offset = len_location - packet;
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offset |= MDNS_NAME_REF;
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return _mdns_append_u16(packet, index, offset);
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}
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/**
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* @brief appends PTR record for service to a packet, incrementing the index
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*
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* @param packet MDNS packet
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* @param index offset in the packet
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* @param server the server that is hosting the service
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* @param service the service to add record for
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*
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* @return length of added data: 0 on error or length on success
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*/
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static uint16_t _mdns_append_ptr_record(uint8_t * packet, uint16_t * index, const char * instance, const char * service, const char * proto, bool flush, bool bye)
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{
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const char * str[4];
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uint16_t record_length = 0;
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uint8_t part_length;
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str[0] = instance;
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str[1] = service;
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str[2] = proto;
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str[3] = MDNS_DEFAULT_DOMAIN;
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part_length = _mdns_append_fqdn(packet, index, str + 1, 3);
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if (!part_length) {
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return 0;
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}
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record_length += part_length;
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part_length = _mdns_append_type(packet, index, MDNS_ANSWER_PTR, false, bye?0:MDNS_ANSWER_PTR_TTL);
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if (!part_length) {
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return 0;
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}
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record_length += part_length;
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uint16_t data_len_location = *index - 2;
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part_length = _mdns_append_fqdn(packet, index, str, 4);
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if (!part_length) {
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return 0;
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}
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_mdns_set_u16(packet, data_len_location, part_length);
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record_length += part_length;
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return record_length;
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}
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/**
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* @brief appends DNS-SD PTR record for service to a packet, incrementing the index
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*
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* @param packet MDNS packet
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* @param index offset in the packet
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* @param server the server that is hosting the service
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* @param service the service to add record for
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*
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* @return length of added data: 0 on error or length on success
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*/
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static uint16_t _mdns_append_sdptr_record(uint8_t * packet, uint16_t * index, mdns_service_t * service, bool flush, bool bye)
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{
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const char * str[3];
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const char * sd_str[4];
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uint16_t record_length = 0;
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uint8_t part_length;
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sd_str[0] = (char*)"_services";
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sd_str[1] = (char*)"_dns-sd";
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sd_str[2] = (char*)"_udp";
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sd_str[3] = MDNS_DEFAULT_DOMAIN;
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str[0] = service->service;
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str[1] = service->proto;
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str[2] = MDNS_DEFAULT_DOMAIN;
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|
|
part_length = _mdns_append_fqdn(packet, index, sd_str, 4);
|
|
|
|
record_length += part_length;
|
|
|
|
part_length = _mdns_append_type(packet, index, MDNS_ANSWER_PTR, flush, MDNS_ANSWER_PTR_TTL);
|
|
if (!part_length) {
|
|
return 0;
|
|
}
|
|
record_length += part_length;
|
|
|
|
uint16_t data_len_location = *index - 2;
|
|
part_length = _mdns_append_fqdn(packet, index, str, 3);
|
|
if (!part_length) {
|
|
return 0;
|
|
}
|
|
_mdns_set_u16(packet, data_len_location, part_length);
|
|
record_length += part_length;
|
|
return record_length;
|
|
}
|
|
|
|
/**
|
|
* @brief appends TXT record for service to a packet, incrementing the index
|
|
*
|
|
* @param packet MDNS packet
|
|
* @param index offset in the packet
|
|
* @param server the server that is hosting the service
|
|
* @param service the service to add record for
|
|
*
|
|
* @return length of added data: 0 on error or length on success
|
|
*/
|
|
static uint16_t _mdns_append_txt_record(uint8_t * packet, uint16_t * index, mdns_service_t * service, bool flush, bool bye)
|
|
{
|
|
const char * str[4];
|
|
uint16_t record_length = 0;
|
|
uint8_t part_length;
|
|
|
|
str[0] = _mdns_get_service_instance_name(service);
|
|
str[1] = service->service;
|
|
str[2] = service->proto;
|
|
str[3] = MDNS_DEFAULT_DOMAIN;
|
|
|
|
if (!str[0]) {
|
|
return 0;
|
|
}
|
|
|
|
part_length = _mdns_append_fqdn(packet, index, str, 4);
|
|
if (!part_length) {
|
|
return 0;
|
|
}
|
|
record_length += part_length;
|
|
|
|
part_length = _mdns_append_type(packet, index, MDNS_ANSWER_TXT, flush, bye?0:MDNS_ANSWER_TXT_TTL);
|
|
if (!part_length) {
|
|
return 0;
|
|
}
|
|
record_length += part_length;
|
|
|
|
uint16_t data_len_location = *index - 2;
|
|
uint16_t data_len = 0;
|
|
|
|
char * tmp;
|
|
mdns_txt_linked_item_t * txt = service->txt;
|
|
while (txt) {
|
|
tmp = (char *)malloc(2 + strlen(txt->key) + strlen(txt->value));
|
|
if (tmp) {
|
|
sprintf(tmp, "%s=%s", txt->key, txt->value);
|
|
uint8_t l = _mdns_append_string(packet, index, tmp);
|
|
free(tmp);
|
|
if (!l) {
|
|
return 0;
|
|
}
|
|
data_len += l;
|
|
}
|
|
txt = txt->next;
|
|
}
|
|
if (!data_len) {
|
|
data_len = 1;
|
|
packet[*index] = 0;
|
|
*index = *index + 1;
|
|
}
|
|
_mdns_set_u16(packet, data_len_location, data_len);
|
|
record_length += data_len;
|
|
return record_length;
|
|
}
|
|
|
|
/**
|
|
* @brief appends SRV record for service to a packet, incrementing the index
|
|
*
|
|
* @param packet MDNS packet
|
|
* @param index offset in the packet
|
|
* @param server the server that is hosting the service
|
|
* @param service the service to add record for
|
|
*
|
|
* @return length of added data: 0 on error or length on success
|
|
*/
|
|
static uint16_t _mdns_append_srv_record(uint8_t * packet, uint16_t * index, mdns_service_t * service, bool flush, bool bye)
|
|
{
|
|
const char * str[4];
|
|
uint16_t record_length = 0;
|
|
uint8_t part_length;
|
|
|
|
str[0] = _mdns_get_service_instance_name(service);
|
|
str[1] = service->service;
|
|
str[2] = service->proto;
|
|
str[3] = MDNS_DEFAULT_DOMAIN;
|
|
|
|
if (!str[0]) {
|
|
return 0;
|
|
}
|
|
|
|
part_length = _mdns_append_fqdn(packet, index, str, 4);
|
|
if (!part_length) {
|
|
return 0;
|
|
}
|
|
record_length += part_length;
|
|
|
|
part_length = _mdns_append_type(packet, index, MDNS_ANSWER_SRV, flush, bye?0:MDNS_ANSWER_SRV_TTL);
|
|
if (!part_length) {
|
|
return 0;
|
|
}
|
|
record_length += part_length;
|
|
|
|
uint16_t data_len_location = *index - 2;
|
|
|
|
part_length = 0;
|
|
part_length += _mdns_append_u16(packet, index, service->priority);
|
|
part_length += _mdns_append_u16(packet, index, service->weight);
|
|
part_length += _mdns_append_u16(packet, index, service->port);
|
|
if (part_length != 6) {
|
|
return 0;
|
|
}
|
|
|
|
str[0] = _mdns_server->hostname;
|
|
str[1] = MDNS_DEFAULT_DOMAIN;
|
|
|
|
if (_str_null_or_empty(str[0])) {
|
|
return 0;
|
|
}
|
|
|
|
part_length = _mdns_append_fqdn(packet, index, str, 2);
|
|
if (!part_length) {
|
|
return 0;
|
|
}
|
|
_mdns_set_u16(packet, data_len_location, part_length + 6);
|
|
|
|
record_length += part_length + 6;
|
|
return record_length;
|
|
}
|
|
|
|
/**
|
|
* @brief appends A record to a packet, incrementing the index
|
|
*
|
|
* @param packet MDNS packet
|
|
* @param index offset in the packet
|
|
* @param server the server
|
|
* @param ip the IP address to add
|
|
*
|
|
* @return length of added data: 0 on error or length on success
|
|
*/
|
|
static uint16_t _mdns_append_a_record(uint8_t * packet, uint16_t * index, uint32_t ip, bool flush, bool bye)
|
|
{
|
|
const char * str[2];
|
|
uint16_t record_length = 0;
|
|
uint8_t part_length;
|
|
|
|
str[0] = _mdns_server->hostname;
|
|
str[1] = MDNS_DEFAULT_DOMAIN;
|
|
|
|
if (_str_null_or_empty(str[0])) {
|
|
return 0;
|
|
}
|
|
|
|
|
|
part_length = _mdns_append_fqdn(packet, index, str, 2);
|
|
if (!part_length) {
|
|
return 0;
|
|
}
|
|
record_length += part_length;
|
|
|
|
part_length = _mdns_append_type(packet, index, MDNS_ANSWER_A, flush, bye?0:MDNS_ANSWER_A_TTL);
|
|
if (!part_length) {
|
|
return 0;
|
|
}
|
|
record_length += part_length;
|
|
|
|
uint16_t data_len_location = *index - 2;
|
|
|
|
if ((*index + 3) >= MDNS_MAX_PACKET_SIZE) {
|
|
return 0;
|
|
}
|
|
_mdns_append_u8(packet, index, ip & 0xFF);
|
|
_mdns_append_u8(packet, index, (ip >> 8) & 0xFF);
|
|
_mdns_append_u8(packet, index, (ip >> 16) & 0xFF);
|
|
_mdns_append_u8(packet, index, (ip >> 24) & 0xFF);
|
|
_mdns_set_u16(packet, data_len_location, 4);
|
|
|
|
record_length += 4;
|
|
return record_length;
|
|
}
|
|
|
|
/**
|
|
* @brief appends AAAA record to a packet, incrementing the index
|
|
*
|
|
* @param packet MDNS packet
|
|
* @param index offset in the packet
|
|
* @param ipv6 the IPv6 address to add
|
|
*
|
|
* @return length of added data: 0 on error or length on success
|
|
*/
|
|
static uint16_t _mdns_append_aaaa_record(uint8_t * packet, uint16_t * index, uint8_t * ipv6, bool flush, bool bye)
|
|
{
|
|
const char * str[2];
|
|
uint16_t record_length = 0;
|
|
uint8_t part_length;
|
|
|
|
str[0] = _mdns_server->hostname;
|
|
str[1] = MDNS_DEFAULT_DOMAIN;
|
|
|
|
if (_str_null_or_empty(str[0])) {
|
|
return 0;
|
|
}
|
|
|
|
|
|
part_length = _mdns_append_fqdn(packet, index, str, 2);
|
|
if (!part_length) {
|
|
return 0;
|
|
}
|
|
record_length += part_length;
|
|
|
|
part_length = _mdns_append_type(packet, index, MDNS_ANSWER_AAAA, flush, bye?0:MDNS_ANSWER_AAAA_TTL);
|
|
if (!part_length) {
|
|
return 0;
|
|
}
|
|
record_length += part_length;
|
|
|
|
uint16_t data_len_location = *index - 2;
|
|
|
|
if ((*index + 15) >= MDNS_MAX_PACKET_SIZE) {
|
|
return 0;
|
|
}
|
|
|
|
part_length = sizeof(ip6_addr_t);
|
|
memcpy(packet + *index, ipv6, part_length);
|
|
*index += part_length;
|
|
_mdns_set_u16(packet, data_len_location, part_length);
|
|
record_length += part_length;
|
|
return record_length;
|
|
}
|
|
|
|
/**
|
|
* @brief Append question to packet
|
|
*/
|
|
static uint16_t _mdns_append_question(uint8_t * packet, uint16_t * index, mdns_out_question_t * q)
|
|
{
|
|
const char * str[4];
|
|
uint8_t str_index = 0;
|
|
uint8_t part_length;
|
|
if (q->host) {
|
|
str[str_index++] = q->host;
|
|
}
|
|
if (q->service) {
|
|
str[str_index++] = q->service;
|
|
}
|
|
if (q->proto) {
|
|
str[str_index++] = q->proto;
|
|
}
|
|
if (q->domain) {
|
|
str[str_index++] = q->domain;
|
|
}
|
|
|
|
part_length = _mdns_append_fqdn(packet, index, str, str_index);
|
|
if (!part_length) {
|
|
return 0;
|
|
}
|
|
|
|
part_length += _mdns_append_u16(packet, index, q->type);
|
|
part_length += _mdns_append_u16(packet, index, q->unicast?0x8001:0x0001);
|
|
return part_length;
|
|
}
|
|
|
|
/**
|
|
* @brief Helper to get either ETH or STA if the other is provided
|
|
* Used when two interfaces are on the same subnet
|
|
*/
|
|
static tcpip_adapter_if_t _mdns_get_other_if (tcpip_adapter_if_t tcpip_if)
|
|
{
|
|
if (tcpip_if == TCPIP_ADAPTER_IF_STA) {
|
|
return TCPIP_ADAPTER_IF_ETH;
|
|
} else if (tcpip_if == TCPIP_ADAPTER_IF_ETH) {
|
|
return TCPIP_ADAPTER_IF_STA;
|
|
}
|
|
return TCPIP_ADAPTER_IF_MAX;
|
|
}
|
|
|
|
/**
|
|
* @brief Check if interface is duplicate (two interfaces on the same subnet)
|
|
*/
|
|
static bool _mdns_if_is_dup(tcpip_adapter_if_t tcpip_if)
|
|
{
|
|
tcpip_adapter_if_t other_if = _mdns_get_other_if (tcpip_if);
|
|
if (other_if == TCPIP_ADAPTER_IF_MAX) {
|
|
return false;
|
|
}
|
|
if (_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].state == PCB_DUP
|
|
|| _mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].state == PCB_DUP
|
|
|| _mdns_server->interfaces[other_if].pcbs[MDNS_IP_PROTOCOL_V4].state == PCB_DUP
|
|
|| _mdns_server->interfaces[other_if].pcbs[MDNS_IP_PROTOCOL_V6].state == PCB_DUP
|
|
) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @brief Check if IPv6 address is NULL
|
|
*/
|
|
static bool _ipv6_address_is_zero(ip6_addr_t ip6)
|
|
{
|
|
uint8_t i;
|
|
uint8_t * data = (uint8_t *)ip6.addr;
|
|
for (i=0; i<16; i++) {
|
|
if (data[i]) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @brief Append answer to packet
|
|
*
|
|
* @return number of answers added to the packet
|
|
*/
|
|
static uint8_t _mdns_append_answer(uint8_t * packet, uint16_t * index, mdns_out_answer_t * answer, tcpip_adapter_if_t tcpip_if)
|
|
{
|
|
if (answer->type == MDNS_TYPE_PTR) {
|
|
|
|
if (answer->service) {
|
|
return _mdns_append_ptr_record(packet, index,
|
|
_mdns_get_service_instance_name(answer->service),
|
|
answer->service->service, answer->service->proto,
|
|
answer->flush, answer->bye) > 0;
|
|
} else {
|
|
return _mdns_append_ptr_record(packet, index,
|
|
answer->custom_instance, answer->custom_service, answer->custom_proto,
|
|
answer->flush, answer->bye) > 0;
|
|
}
|
|
} else if (answer->type == MDNS_TYPE_SRV) {
|
|
return _mdns_append_srv_record(packet, index, answer->service, answer->flush, answer->bye) > 0;
|
|
} else if (answer->type == MDNS_TYPE_TXT) {
|
|
return _mdns_append_txt_record(packet, index, answer->service, answer->flush, answer->bye) > 0;
|
|
} else if (answer->type == MDNS_TYPE_SDPTR) {
|
|
return _mdns_append_sdptr_record(packet, index, answer->service, answer->flush, answer->bye) > 0;
|
|
} else if (answer->type == MDNS_TYPE_A) {
|
|
tcpip_adapter_ip_info_t if_ip_info;
|
|
if (!_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].pcb && _mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].state != PCB_DUP) {
|
|
return 0;
|
|
}
|
|
if (tcpip_adapter_get_ip_info(tcpip_if, &if_ip_info)) {
|
|
return 0;
|
|
}
|
|
if (_mdns_append_a_record(packet, index, if_ip_info.ip.addr, answer->flush, answer->bye) <= 0) {
|
|
return 0;
|
|
}
|
|
if (!_mdns_if_is_dup(tcpip_if)) {
|
|
return 1;
|
|
}
|
|
tcpip_adapter_if_t other_if = _mdns_get_other_if (tcpip_if);
|
|
if (tcpip_adapter_get_ip_info(other_if, &if_ip_info)) {
|
|
return 1;
|
|
}
|
|
if (_mdns_append_a_record(packet, index, if_ip_info.ip.addr, answer->flush, answer->bye) > 0) {
|
|
return 2;
|
|
}
|
|
return 1;
|
|
} else if (answer->type == MDNS_TYPE_AAAA) {
|
|
struct ip6_addr if_ip6;
|
|
if (!_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].pcb && _mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].state != PCB_DUP) {
|
|
return 0;
|
|
}
|
|
if (tcpip_adapter_get_ip6_linklocal(tcpip_if, &if_ip6)) {
|
|
return 0;
|
|
}
|
|
if (_ipv6_address_is_zero(if_ip6)) {
|
|
return 0;
|
|
}
|
|
if (_mdns_append_aaaa_record(packet, index, (uint8_t*)if_ip6.addr, answer->flush, answer->bye) <= 0) {
|
|
return 0;
|
|
}
|
|
if (!_mdns_if_is_dup(tcpip_if)) {
|
|
return 1;
|
|
}
|
|
tcpip_adapter_if_t other_if = _mdns_get_other_if (tcpip_if);
|
|
if (tcpip_adapter_get_ip6_linklocal(other_if, &if_ip6)) {
|
|
return 1;
|
|
}
|
|
if (_mdns_append_aaaa_record(packet, index, (uint8_t*)if_ip6.addr, answer->flush, answer->bye) > 0) {
|
|
return 2;
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief sends a packet
|
|
*
|
|
* @param p the packet
|
|
*/
|
|
static void _mdns_dispatch_tx_packet(mdns_tx_packet_t * p)
|
|
{
|
|
static uint8_t packet[MDNS_MAX_PACKET_SIZE];
|
|
uint16_t index = MDNS_HEAD_LEN;
|
|
memset(packet, 0, MDNS_HEAD_LEN);
|
|
mdns_out_question_t * q;
|
|
mdns_out_answer_t * a;
|
|
uint8_t count;
|
|
|
|
_mdns_set_u16(packet, MDNS_HEAD_FLAGS_OFFSET, p->flags);
|
|
|
|
count = 0;
|
|
q = p->questions;
|
|
while (q) {
|
|
if (_mdns_append_question(packet, &index, q)) {
|
|
count++;
|
|
}
|
|
q = q->next;
|
|
}
|
|
_mdns_set_u16(packet, MDNS_HEAD_QUESTIONS_OFFSET, count);
|
|
|
|
count = 0;
|
|
a = p->answers;
|
|
while (a) {
|
|
count += _mdns_append_answer(packet, &index, a, p->tcpip_if);
|
|
a = a->next;
|
|
}
|
|
_mdns_set_u16(packet, MDNS_HEAD_ANSWERS_OFFSET, count);
|
|
|
|
count = 0;
|
|
a = p->servers;
|
|
while (a) {
|
|
count += _mdns_append_answer(packet, &index, a, p->tcpip_if);
|
|
a = a->next;
|
|
}
|
|
_mdns_set_u16(packet, MDNS_HEAD_SERVERS_OFFSET, count);
|
|
|
|
count = 0;
|
|
a = p->additional;
|
|
while (a) {
|
|
count += _mdns_append_answer(packet, &index, a, p->tcpip_if);
|
|
a = a->next;
|
|
}
|
|
_mdns_set_u16(packet, MDNS_HEAD_ADDITIONAL_OFFSET, count);
|
|
|
|
#ifdef MDNS_ENABLE_DEBUG
|
|
_mdns_dbg_printf("\nTX[%u][%u]: ", p->tcpip_if, p->ip_protocol);
|
|
if (p->dst.type == IPADDR_TYPE_V4) {
|
|
_mdns_dbg_printf("To: " IPSTR ":%u, ", IP2STR(&p->dst.u_addr.ip4), p->port);
|
|
} else {
|
|
_mdns_dbg_printf("To: " IPV6STR ":%u, ", IPV62STR(p->dst.u_addr.ip6), p->port);
|
|
}
|
|
mdns_debug_packet(packet, index);
|
|
#endif
|
|
|
|
_mdns_udp_pcb_write(p->tcpip_if, p->ip_protocol, &p->dst, p->port, packet, index);
|
|
}
|
|
|
|
/**
|
|
* @brief frees a packet
|
|
*
|
|
* @param packet the packet
|
|
*/
|
|
static void _mdns_free_tx_packet(mdns_tx_packet_t * packet)
|
|
{
|
|
if (!packet) {
|
|
return;
|
|
}
|
|
queueFree(mdns_out_question_t, packet->questions);
|
|
queueFree(mdns_out_answer_t, packet->answers);
|
|
queueFree(mdns_out_answer_t, packet->servers);
|
|
queueFree(mdns_out_answer_t, packet->additional);
|
|
free(packet);
|
|
}
|
|
|
|
/**
|
|
* @brief schedules a packet to be sent after given milliseconds
|
|
*
|
|
* @param packet the packet
|
|
* @param ms_after number of milliseconds after which the packet should be dispatched
|
|
*/
|
|
static void _mdns_schedule_tx_packet(mdns_tx_packet_t * packet, uint32_t ms_after)
|
|
{
|
|
if (!packet) {
|
|
return;
|
|
}
|
|
packet->send_at = (xTaskGetTickCount() * portTICK_PERIOD_MS) + ms_after;
|
|
packet->next = NULL;
|
|
if (!_mdns_server->tx_queue_head || _mdns_server->tx_queue_head->send_at > packet->send_at) {
|
|
packet->next = _mdns_server->tx_queue_head;
|
|
_mdns_server->tx_queue_head = packet;
|
|
return;
|
|
}
|
|
mdns_tx_packet_t * q = _mdns_server->tx_queue_head;
|
|
while (q->next && q->next->send_at <= packet->send_at) {
|
|
q = q->next;
|
|
}
|
|
packet->next = q->next;
|
|
q->next = packet;
|
|
}
|
|
|
|
/**
|
|
* @brief free all packets scheduled for sending
|
|
*/
|
|
static void _mdns_clear_tx_queue_head()
|
|
{
|
|
mdns_tx_packet_t * q;
|
|
while (_mdns_server->tx_queue_head) {
|
|
q = _mdns_server->tx_queue_head;
|
|
_mdns_server->tx_queue_head = _mdns_server->tx_queue_head->next;
|
|
_mdns_free_tx_packet(q);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief clear packets scheduled for sending on a specific interface
|
|
*
|
|
* @param tcpip_if the interface
|
|
* @param ip_protocol pcb type V4/V6
|
|
*/
|
|
static void _mdns_clear_pcb_tx_queue_head(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
mdns_tx_packet_t * q, * p;
|
|
while (_mdns_server->tx_queue_head && _mdns_server->tx_queue_head->tcpip_if == tcpip_if && _mdns_server->tx_queue_head->ip_protocol == ip_protocol) {
|
|
q = _mdns_server->tx_queue_head;
|
|
_mdns_server->tx_queue_head = _mdns_server->tx_queue_head->next;
|
|
_mdns_free_tx_packet(q);
|
|
}
|
|
if (_mdns_server->tx_queue_head) {
|
|
q = _mdns_server->tx_queue_head;
|
|
while (q->next) {
|
|
if (q->next->tcpip_if == tcpip_if && q->next->ip_protocol == ip_protocol) {
|
|
p = q->next;
|
|
q->next = p->next;
|
|
_mdns_free_tx_packet(p);
|
|
} else {
|
|
q = q->next;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief get the next packet scheduled for sending on a specific interface
|
|
*
|
|
* @param tcpip_if the interface
|
|
* @param ip_protocol pcb type V4/V6
|
|
*/
|
|
static mdns_tx_packet_t * _mdns_get_next_pcb_packet(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
mdns_tx_packet_t * q = _mdns_server->tx_queue_head;
|
|
while (q) {
|
|
if (q->tcpip_if == tcpip_if && q->ip_protocol == ip_protocol) {
|
|
return q;
|
|
}
|
|
q = q->next;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* @brief Find, remove and free answer from the scheduled packets
|
|
*/
|
|
static void _mdns_remove_scheduled_answer(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, uint16_t type, mdns_srv_item_t * service)
|
|
{
|
|
mdns_srv_item_t s = {NULL, NULL};
|
|
if (!service) {
|
|
service = &s;
|
|
}
|
|
mdns_tx_packet_t * q = _mdns_server->tx_queue_head;
|
|
while (q) {
|
|
if (q->tcpip_if == tcpip_if && q->ip_protocol == ip_protocol && q->distributed) {
|
|
mdns_out_answer_t * a = q->answers;
|
|
if (a->type == type && a->service == service->service) {
|
|
q->answers = q->answers->next;
|
|
free(a);
|
|
} else {
|
|
while (a->next) {
|
|
if (a->next->type == type && a->next->service == service->service) {
|
|
mdns_out_answer_t * b = a->next;
|
|
a->next = b->next;
|
|
free(b);
|
|
break;
|
|
}
|
|
a = a->next;
|
|
}
|
|
}
|
|
}
|
|
q = q->next;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Remove and free answer from answer list (destination)
|
|
*/
|
|
static void _mdns_dealloc_answer(mdns_out_answer_t ** destnation, uint16_t type, mdns_srv_item_t * service)
|
|
{
|
|
mdns_out_answer_t * d = *destnation;
|
|
if (!d) {
|
|
return;
|
|
}
|
|
mdns_srv_item_t s = {NULL, NULL};
|
|
if (!service) {
|
|
service = &s;
|
|
}
|
|
if (d->type == type && d->service == service->service) {
|
|
*destnation = d->next;
|
|
free(d);
|
|
return;
|
|
}
|
|
while (d->next) {
|
|
mdns_out_answer_t * a = d->next;
|
|
if (a->type == type && a->service == service->service) {
|
|
d->next = a->next;
|
|
free(a);
|
|
return;
|
|
}
|
|
d = d->next;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Allocate new answer and add it to answer list (destination)
|
|
*/
|
|
static bool _mdns_alloc_answer(mdns_out_answer_t ** destnation, uint16_t type, mdns_service_t * service, bool flush, bool bye)
|
|
{
|
|
mdns_out_answer_t * d = *destnation;
|
|
while (d) {
|
|
if (d->type == type && d->service == service) {
|
|
return true;
|
|
}
|
|
d = d->next;
|
|
}
|
|
|
|
mdns_out_answer_t * a = (mdns_out_answer_t *)malloc(sizeof(mdns_out_answer_t));
|
|
if (!a) {
|
|
return false;
|
|
}
|
|
a->type = type;
|
|
a->service = service;
|
|
a->bye = bye;
|
|
a->flush = flush;
|
|
a->next = NULL;
|
|
queueToEnd(mdns_out_answer_t, *destnation, a);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @brief Allocate new packet for sending
|
|
*/
|
|
static mdns_tx_packet_t * _mdns_alloc_packet_default(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
mdns_tx_packet_t * packet = (mdns_tx_packet_t*)malloc(sizeof(mdns_tx_packet_t));
|
|
if (!packet) {
|
|
return NULL;
|
|
}
|
|
memset((uint8_t*)packet, 0, sizeof(mdns_tx_packet_t));
|
|
packet->tcpip_if = tcpip_if;
|
|
packet->ip_protocol = ip_protocol;
|
|
packet->port = MDNS_SERVICE_PORT;
|
|
if (ip_protocol == MDNS_IP_PROTOCOL_V4) {
|
|
IP_ADDR4(&packet->dst, 224, 0, 0, 251);
|
|
} else {
|
|
ip_addr_t addr = IPADDR6_INIT(0x000002ff, 0, 0, 0xfb000000);
|
|
memcpy(&packet->dst, &addr, sizeof(ip_addr_t));
|
|
}
|
|
return packet;
|
|
}
|
|
|
|
/**
|
|
* @brief Create answer packet to questions from parsed packet
|
|
*/
|
|
static void _mdns_create_answer_from_parsed_packet(mdns_parsed_packet_t * parsed_packet)
|
|
{
|
|
if (!parsed_packet->questions) {
|
|
return;
|
|
}
|
|
bool send_flush = parsed_packet->src_port == MDNS_SERVICE_PORT;
|
|
bool unicast = false;
|
|
bool shared = false;
|
|
mdns_tx_packet_t * packet = _mdns_alloc_packet_default(parsed_packet->tcpip_if, parsed_packet->ip_protocol);
|
|
if (!packet) {
|
|
return;
|
|
}
|
|
packet->flags = MDNS_FLAGS_AUTHORITATIVE;
|
|
packet->distributed = parsed_packet->distributed;
|
|
|
|
mdns_parsed_question_t * q = parsed_packet->questions;
|
|
while (q) {
|
|
mdns_srv_item_t * service = NULL;
|
|
if (q->service && q->proto) {
|
|
service = _mdns_get_service_item(q->service, q->proto);
|
|
if (!service) {
|
|
continue;
|
|
}
|
|
}
|
|
if (q->unicast) {
|
|
unicast = true;
|
|
}
|
|
if (service) {
|
|
if (q->type == MDNS_TYPE_PTR || q->type == MDNS_TYPE_ANY) {
|
|
if (q->type == MDNS_TYPE_PTR) {
|
|
shared = true;
|
|
}
|
|
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_PTR, service->service, false, false)
|
|
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SRV, service->service, send_flush, false)
|
|
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_TXT, service->service, send_flush, false)
|
|
|| !_mdns_alloc_answer(shared?&packet->additional:&packet->answers, MDNS_TYPE_A, NULL, send_flush, false)
|
|
|| !_mdns_alloc_answer(shared?&packet->additional:&packet->answers, MDNS_TYPE_AAAA, NULL, send_flush, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return;
|
|
}
|
|
} else if (q->type == MDNS_TYPE_SRV) {
|
|
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SRV, service->service, send_flush, false)
|
|
|| !_mdns_alloc_answer(&packet->additional, MDNS_TYPE_A, NULL, send_flush, false)
|
|
|| !_mdns_alloc_answer(&packet->additional, MDNS_TYPE_AAAA, NULL, send_flush, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return;
|
|
}
|
|
} else if (q->type == MDNS_TYPE_TXT) {
|
|
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_TXT, service->service, send_flush, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return;
|
|
}
|
|
} else if (q->type == MDNS_TYPE_SDPTR) {
|
|
shared = true;
|
|
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_PTR, service->service, false, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return;
|
|
}
|
|
}
|
|
} else {
|
|
if (q->type == MDNS_TYPE_ANY || q->type == MDNS_TYPE_A || q->type == MDNS_TYPE_AAAA) {
|
|
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_A, NULL, send_flush, false)
|
|
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_AAAA, NULL, send_flush, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return;
|
|
}
|
|
} else if (!_mdns_alloc_answer(&packet->answers, q->type, NULL, send_flush, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return;
|
|
}
|
|
}
|
|
q = q->next;
|
|
}
|
|
if (unicast || !send_flush) {
|
|
memcpy(&packet->dst, &parsed_packet->src, sizeof(ip_addr_t));
|
|
packet->port = parsed_packet->src_port;
|
|
}
|
|
|
|
static uint8_t share_step = 0;
|
|
if (shared) {
|
|
_mdns_schedule_tx_packet(packet, 25 + (share_step * 25));
|
|
share_step = (share_step + 1) & 0x03;
|
|
} else {
|
|
_mdns_dispatch_tx_packet(packet);
|
|
_mdns_free_tx_packet(packet);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Check if question is already in the list
|
|
*/
|
|
static bool _mdns_question_exists(mdns_out_question_t * needle, mdns_out_question_t * haystack)
|
|
{
|
|
while (haystack) {
|
|
if (haystack->type == needle->type
|
|
&& haystack->host == needle->host
|
|
&& haystack->service == needle->service
|
|
&& haystack->proto == needle->proto) {
|
|
return true;
|
|
}
|
|
haystack = haystack->next;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @brief Create probe packet for particular services on particular PCB
|
|
*/
|
|
static mdns_tx_packet_t * _mdns_create_probe_packet(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, mdns_srv_item_t * services[], size_t len, bool first, bool include_ip)
|
|
{
|
|
mdns_tx_packet_t * packet = _mdns_alloc_packet_default(tcpip_if, ip_protocol);
|
|
if (!packet) {
|
|
return NULL;
|
|
}
|
|
|
|
size_t i;
|
|
for (i=0; i<len; i++) {
|
|
mdns_out_question_t * q = (mdns_out_question_t *)malloc(sizeof(mdns_out_question_t));
|
|
if (!q) {
|
|
_mdns_free_tx_packet(packet);
|
|
return NULL;
|
|
}
|
|
q->next = NULL;
|
|
q->unicast = first;
|
|
q->type = MDNS_TYPE_ANY;
|
|
q->host = _mdns_get_service_instance_name(services[i]->service);
|
|
q->service = services[i]->service->service;
|
|
q->proto = services[i]->service->proto;
|
|
q->domain = MDNS_DEFAULT_DOMAIN;
|
|
if (!q->host || _mdns_question_exists(q, packet->questions)) {
|
|
free(q);
|
|
} else {
|
|
queueToEnd(mdns_out_question_t, packet->questions, q);
|
|
}
|
|
|
|
if (!q->host || !_mdns_alloc_answer(&packet->servers, MDNS_TYPE_SRV, services[i]->service, false, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if (include_ip && !_str_null_or_empty(_mdns_server->hostname)) {
|
|
mdns_out_question_t * q = (mdns_out_question_t *)malloc(sizeof(mdns_out_question_t));
|
|
if (!q) {
|
|
_mdns_free_tx_packet(packet);
|
|
return NULL;
|
|
}
|
|
q->next = NULL;
|
|
q->unicast = first;
|
|
q->type = MDNS_TYPE_ANY;
|
|
q->host = _mdns_server->hostname;
|
|
q->service = NULL;
|
|
q->proto = NULL;
|
|
q->domain = MDNS_DEFAULT_DOMAIN;
|
|
if (_mdns_question_exists(q, packet->questions)) {
|
|
free(q);
|
|
} else {
|
|
queueToEnd(mdns_out_question_t, packet->questions, q);
|
|
}
|
|
|
|
if (_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].pcb) {
|
|
if (!_mdns_alloc_answer(&packet->servers, MDNS_TYPE_A, NULL, false, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if (_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].pcb) {
|
|
if (!_mdns_alloc_answer(&packet->servers, MDNS_TYPE_AAAA, NULL, false, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
return packet;
|
|
}
|
|
|
|
/**
|
|
* @brief Create announce packet for particular services on particular PCB
|
|
*/
|
|
static mdns_tx_packet_t * _mdns_create_announce_packet(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, mdns_srv_item_t * services[], size_t len, bool include_ip)
|
|
{
|
|
mdns_tx_packet_t * packet = _mdns_alloc_packet_default(tcpip_if, ip_protocol);
|
|
if (!packet) {
|
|
return NULL;
|
|
}
|
|
packet->flags = MDNS_FLAGS_AUTHORITATIVE;
|
|
|
|
uint8_t i;
|
|
for (i=0; i<len; i++) {
|
|
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SDPTR, services[i]->service, false, false)
|
|
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_PTR, services[i]->service, false, false)
|
|
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SRV, services[i]->service, true, false)
|
|
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_TXT, services[i]->service, true, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return NULL;
|
|
}
|
|
}
|
|
if (include_ip) {
|
|
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_A, NULL, true, false)
|
|
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_AAAA, NULL, true, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return NULL;
|
|
}
|
|
}
|
|
return packet;
|
|
}
|
|
|
|
/**
|
|
* @brief Convert probe packet to announce
|
|
*/
|
|
static mdns_tx_packet_t * _mdns_create_announce_from_probe(mdns_tx_packet_t * probe)
|
|
{
|
|
|
|
mdns_tx_packet_t * packet = _mdns_alloc_packet_default(probe->tcpip_if, probe->ip_protocol);
|
|
if (!packet) {
|
|
return NULL;
|
|
}
|
|
packet->flags = MDNS_FLAGS_AUTHORITATIVE;
|
|
|
|
mdns_out_answer_t * s = probe->servers;
|
|
while (s) {
|
|
if (s->type == MDNS_TYPE_SRV) {
|
|
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SDPTR, s->service, false, false)
|
|
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_PTR, s->service, false, false)
|
|
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_SRV, s->service, true, false)
|
|
|| !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_TXT, s->service, true, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return NULL;
|
|
}
|
|
|
|
} else if (s->type == MDNS_TYPE_A || s->type == MDNS_TYPE_AAAA) {
|
|
if (!_mdns_alloc_answer(&packet->answers, s->type, NULL, true, false)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
s = s->next;
|
|
}
|
|
return packet;
|
|
}
|
|
|
|
/**
|
|
* @brief Send by for particular services on particular PCB
|
|
*/
|
|
static void _mdns_pcb_send_bye(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, mdns_srv_item_t ** services, size_t len, bool include_ip)
|
|
{
|
|
mdns_tx_packet_t * packet = _mdns_alloc_packet_default(tcpip_if, ip_protocol);
|
|
if (!packet) {
|
|
return;
|
|
}
|
|
size_t i;
|
|
for (i=0; i<len; i++) {
|
|
if (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_PTR, services[i]->service, true, true)) {
|
|
_mdns_free_tx_packet(packet);
|
|
return;
|
|
}
|
|
}
|
|
if (include_ip && (!_mdns_alloc_answer(&packet->answers, MDNS_TYPE_A, NULL, true, true) || !_mdns_alloc_answer(&packet->answers, MDNS_TYPE_AAAA, NULL, true, true))) {
|
|
_mdns_free_tx_packet(packet);
|
|
return;
|
|
}
|
|
_mdns_dispatch_tx_packet(packet);
|
|
_mdns_free_tx_packet(packet);
|
|
}
|
|
|
|
/**
|
|
* @brief Send probe for particular services on particular PCB
|
|
*/
|
|
static void _mdns_init_pcb_probe(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, mdns_srv_item_t ** services, size_t len, bool probe_ip)
|
|
{
|
|
mdns_pcb_t * pcb = &_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol];
|
|
size_t services_final_len = len;
|
|
|
|
_mdns_clear_pcb_tx_queue_head(tcpip_if, ip_protocol);
|
|
|
|
if (_str_null_or_empty(_mdns_server->hostname)) {
|
|
pcb->state = PCB_RUNNING;
|
|
return;
|
|
}
|
|
|
|
if (PCB_STATE_IS_PROBING(pcb)) {
|
|
services_final_len += pcb->probe_services_len;
|
|
}
|
|
mdns_srv_item_t ** _services = NULL;
|
|
if (services_final_len) {
|
|
_services = (mdns_srv_item_t **)malloc(sizeof(mdns_srv_item_t *) * services_final_len);
|
|
if (!_services) {
|
|
return;
|
|
}
|
|
|
|
size_t i;
|
|
for (i=0; i<len; i++) {
|
|
_services[i] = services[i];
|
|
}
|
|
if (pcb->probe_services) {
|
|
for (i=0; i<pcb->probe_services_len; i++) {
|
|
_services[len+i] = pcb->probe_services[i];
|
|
}
|
|
free(pcb->probe_services);
|
|
}
|
|
}
|
|
|
|
probe_ip = pcb->probe_ip || probe_ip;
|
|
|
|
pcb->probe_ip = false;
|
|
pcb->probe_services = NULL;
|
|
pcb->probe_services_len = 0;
|
|
pcb->probe_running = false;
|
|
|
|
mdns_tx_packet_t * packet = _mdns_create_probe_packet(tcpip_if, ip_protocol, _services, services_final_len, true, probe_ip);
|
|
if (!packet) {
|
|
free(_services);
|
|
return;
|
|
}
|
|
|
|
pcb->probe_ip = probe_ip;
|
|
pcb->probe_services = _services;
|
|
pcb->probe_services_len = services_final_len;
|
|
pcb->probe_running = true;
|
|
_mdns_schedule_tx_packet(packet, ((pcb->failed_probes > 5)?1000:120) + (esp_random() & 0x7F));
|
|
pcb->state = PCB_PROBE_1;
|
|
}
|
|
|
|
/**
|
|
* @brief Restart the responder on particular PCB
|
|
*/
|
|
static void _mdns_restart_pcb(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
size_t srv_count = 0;
|
|
mdns_srv_item_t * a = _mdns_server->services;
|
|
while (a) {
|
|
srv_count++;
|
|
a = a->next;
|
|
}
|
|
mdns_srv_item_t * services[srv_count];
|
|
size_t i = 0;
|
|
a = _mdns_server->services;
|
|
while (a) {
|
|
services[i++] = a;
|
|
a = a->next;
|
|
}
|
|
_mdns_init_pcb_probe(tcpip_if, ip_protocol, services, srv_count, true);
|
|
}
|
|
|
|
/**
|
|
* @brief Send by for particular services
|
|
*/
|
|
static void _mdns_send_bye(mdns_srv_item_t ** services, size_t len, bool include_ip)
|
|
{
|
|
uint8_t i, j;
|
|
if (_str_null_or_empty(_mdns_server->hostname)) {
|
|
return;
|
|
}
|
|
|
|
for (i=0; i<TCPIP_ADAPTER_IF_MAX; i++) {
|
|
for (j=0; j<MDNS_IP_PROTOCOL_MAX; j++) {
|
|
if (_mdns_server->interfaces[i].pcbs[j].pcb && _mdns_server->interfaces[i].pcbs[j].state == PCB_RUNNING) {
|
|
_mdns_pcb_send_bye((tcpip_adapter_if_t)i, (mdns_ip_protocol_t)j, services, len, include_ip);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Send announcement on particular PCB
|
|
*/
|
|
static void _mdns_announce_pcb(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, mdns_srv_item_t ** services, size_t len, bool include_ip)
|
|
{
|
|
mdns_pcb_t * _pcb = &_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol];
|
|
size_t i;
|
|
if (_pcb->pcb) {
|
|
if (PCB_STATE_IS_PROBING(_pcb)) {
|
|
_mdns_init_pcb_probe(tcpip_if, ip_protocol, services, len, include_ip);
|
|
} else if (PCB_STATE_IS_ANNOUNCING(_pcb)) {
|
|
mdns_tx_packet_t * p = _mdns_get_next_pcb_packet(tcpip_if, ip_protocol);
|
|
if (p) {
|
|
for (i=0; i<len; i++) {
|
|
if (!_mdns_alloc_answer(&p->answers, MDNS_TYPE_SDPTR, services[i]->service, false, false)
|
|
|| !_mdns_alloc_answer(&p->answers, MDNS_TYPE_PTR, services[i]->service, false, false)
|
|
|| !_mdns_alloc_answer(&p->answers, MDNS_TYPE_SRV, services[i]->service, true, false)
|
|
|| !_mdns_alloc_answer(&p->answers, MDNS_TYPE_TXT, services[i]->service, true, false)) {
|
|
break;
|
|
}
|
|
}
|
|
if (include_ip) {
|
|
_mdns_dealloc_answer(&p->additional, MDNS_TYPE_A, NULL);
|
|
_mdns_dealloc_answer(&p->additional, MDNS_TYPE_AAAA, NULL);
|
|
_mdns_alloc_answer(&p->answers, MDNS_TYPE_A, NULL, true, false);
|
|
_mdns_alloc_answer(&p->answers, MDNS_TYPE_AAAA, NULL, true, false);
|
|
}
|
|
_pcb->state = PCB_ANNOUNCE_1;
|
|
}
|
|
} else if (_pcb->state == PCB_RUNNING) {
|
|
|
|
if (_str_null_or_empty(_mdns_server->hostname)) {
|
|
return;
|
|
}
|
|
|
|
_pcb->state = PCB_ANNOUNCE_1;
|
|
mdns_tx_packet_t * p = _mdns_create_announce_packet(tcpip_if, ip_protocol, services, len, include_ip);
|
|
if (p) {
|
|
_mdns_schedule_tx_packet(p, 0);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Send probe on all active PCBs
|
|
*/
|
|
static void _mdns_probe_all_pcbs(mdns_srv_item_t ** services, size_t len, bool probe_ip, bool clear_old_probe)
|
|
{
|
|
uint8_t i, j;
|
|
for (i=0; i<TCPIP_ADAPTER_IF_MAX; i++) {
|
|
for (j=0; j<MDNS_IP_PROTOCOL_MAX; j++) {
|
|
if (_mdns_server->interfaces[i].pcbs[j].pcb) {
|
|
mdns_pcb_t * _pcb = &_mdns_server->interfaces[i].pcbs[j];
|
|
if (clear_old_probe) {
|
|
free(_pcb->probe_services);
|
|
_pcb->probe_services = NULL;
|
|
_pcb->probe_services_len = 0;
|
|
_pcb->probe_running = false;
|
|
}
|
|
_mdns_init_pcb_probe((tcpip_adapter_if_t)i, (mdns_ip_protocol_t)j, services, len, probe_ip);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Send announcement on all active PCBs
|
|
*/
|
|
static void _mdns_announce_all_pcbs(mdns_srv_item_t ** services, size_t len, bool include_ip)
|
|
{
|
|
uint8_t i, j;
|
|
for (i=0; i<TCPIP_ADAPTER_IF_MAX; i++) {
|
|
for (j=0; j<MDNS_IP_PROTOCOL_MAX; j++) {
|
|
_mdns_announce_pcb((tcpip_adapter_if_t)i, (mdns_ip_protocol_t)j, services, len, include_ip);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Restart the responder on all active PCBs
|
|
*/
|
|
static void _mdns_send_final_bye(bool include_ip)
|
|
{
|
|
//collect all services and start probe
|
|
size_t srv_count = 0;
|
|
mdns_srv_item_t * a = _mdns_server->services;
|
|
while (a) {
|
|
if (!a->service->instance) {
|
|
srv_count++;
|
|
}
|
|
a = a->next;
|
|
}
|
|
if (!srv_count) {
|
|
return;
|
|
}
|
|
mdns_srv_item_t * services[srv_count];
|
|
size_t i = 0;
|
|
a = _mdns_server->services;
|
|
while (a) {
|
|
if (!a->service->instance) {
|
|
services[i++] = a;
|
|
}
|
|
a = a->next;
|
|
}
|
|
_mdns_send_bye(services, srv_count, include_ip);
|
|
}
|
|
|
|
/**
|
|
* @brief Stop the responder on all services without instance
|
|
*/
|
|
static void _mdns_send_bye_all_pcbs_no_instance()
|
|
{
|
|
size_t srv_count = 0;
|
|
mdns_srv_item_t * a = _mdns_server->services;
|
|
while (a) {
|
|
if (!a->service->instance) {
|
|
srv_count++;
|
|
}
|
|
a = a->next;
|
|
}
|
|
if (!srv_count) {
|
|
return;
|
|
}
|
|
mdns_srv_item_t * services[srv_count];
|
|
size_t i = 0;
|
|
a = _mdns_server->services;
|
|
while (a) {
|
|
if (!a->service->instance) {
|
|
services[i++] = a;
|
|
}
|
|
a = a->next;
|
|
}
|
|
_mdns_send_bye(services, srv_count, false);
|
|
}
|
|
|
|
/**
|
|
* @brief Restart the responder on all services without instance
|
|
*/
|
|
static void _mdns_restart_all_pcbs_no_instance()
|
|
{
|
|
size_t srv_count = 0;
|
|
mdns_srv_item_t * a = _mdns_server->services;
|
|
while (a) {
|
|
if (!a->service->instance) {
|
|
srv_count++;
|
|
}
|
|
a = a->next;
|
|
}
|
|
if (!srv_count) {
|
|
return;
|
|
}
|
|
mdns_srv_item_t * services[srv_count];
|
|
size_t i = 0;
|
|
a = _mdns_server->services;
|
|
while (a) {
|
|
if (!a->service->instance) {
|
|
services[i++] = a;
|
|
}
|
|
a = a->next;
|
|
}
|
|
_mdns_probe_all_pcbs(services, srv_count, false, true);
|
|
}
|
|
|
|
/**
|
|
* @brief Restart the responder on all active PCBs
|
|
*/
|
|
static void _mdns_restart_all_pcbs()
|
|
{
|
|
_mdns_clear_tx_queue_head();
|
|
size_t srv_count = 0;
|
|
mdns_srv_item_t * a = _mdns_server->services;
|
|
while (a) {
|
|
srv_count++;
|
|
a = a->next;
|
|
}
|
|
mdns_srv_item_t * services[srv_count];
|
|
size_t l = 0;
|
|
a = _mdns_server->services;
|
|
while (a) {
|
|
services[l++] = a;
|
|
a = a->next;
|
|
}
|
|
|
|
_mdns_probe_all_pcbs(services, srv_count, true, true);
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* @brief creates/allocates new text item list
|
|
* @param num_items service number of txt items or 0
|
|
* @param txt service txt items array or NULL
|
|
*
|
|
* @return pointer to the linked txt item list or NULL
|
|
*/
|
|
static mdns_txt_linked_item_t * _mdns_allocate_txt(size_t num_items, mdns_txt_item_t txt[])
|
|
{
|
|
mdns_txt_linked_item_t * new_txt = NULL;
|
|
size_t i = 0;
|
|
if (num_items) {
|
|
for (i=0; i<num_items; i++) {
|
|
mdns_txt_linked_item_t * new_item = (mdns_txt_linked_item_t *)malloc(sizeof(mdns_txt_linked_item_t));
|
|
if (!new_item) {
|
|
break;
|
|
}
|
|
new_item->key = strdup(txt[i].key);
|
|
if (!new_item->key) {
|
|
free(new_item);
|
|
break;
|
|
}
|
|
new_item->value = strdup(txt[i].value);
|
|
if (!new_item->value) {
|
|
free((char *)new_item->key);
|
|
free(new_item);
|
|
break;
|
|
}
|
|
new_item->next = new_txt;
|
|
new_txt = new_item;
|
|
}
|
|
}
|
|
return new_txt;
|
|
}
|
|
|
|
/**
|
|
* @brief creates/allocates new service
|
|
* @param service service type
|
|
* @param proto service proto
|
|
* @param port service port
|
|
* @param instance service instance
|
|
* @param num_items service number of txt items or 0
|
|
* @param txt service txt items array or NULL
|
|
*
|
|
* @return pointer to the service or NULL on error
|
|
*/
|
|
static mdns_service_t * _mdns_create_service(const char * service, const char * proto, uint16_t port, const char * instance, size_t num_items, mdns_txt_item_t txt[])
|
|
{
|
|
mdns_service_t * s = (mdns_service_t *)malloc(sizeof(mdns_service_t));
|
|
if (!s) {
|
|
return NULL;
|
|
}
|
|
|
|
mdns_txt_linked_item_t * new_txt = _mdns_allocate_txt(num_items, txt);
|
|
if (num_items && new_txt == NULL) {
|
|
free(s);
|
|
return NULL;
|
|
}
|
|
|
|
s->priority = 0;
|
|
s->weight = 0;
|
|
s->instance = instance?strndup(instance, MDNS_NAME_BUF_LEN - 1):NULL;
|
|
s->txt = new_txt;
|
|
s->port = port;
|
|
|
|
s->service = strndup(service, MDNS_NAME_BUF_LEN - 1);
|
|
if (!s->service) {
|
|
free(s);
|
|
return NULL;
|
|
}
|
|
|
|
s->proto = strndup(proto, MDNS_NAME_BUF_LEN - 1);
|
|
if (!s->proto) {
|
|
free((char *)s->service);
|
|
free(s);
|
|
return NULL;
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
/**
|
|
* @brief Remove and free service answer from answer list (destination)
|
|
*/
|
|
static void _mdns_dealloc_scheduled_service_answers(mdns_out_answer_t ** destination, mdns_service_t * service)
|
|
{
|
|
mdns_out_answer_t * d = *destination;
|
|
if (!d) {
|
|
return;
|
|
}
|
|
while (d && d->service == service) {
|
|
*destination = d->next;
|
|
free(d);
|
|
d = *destination;
|
|
}
|
|
while (d && d->next) {
|
|
mdns_out_answer_t * a = d->next;
|
|
if (a->service == service) {
|
|
d->next = a->next;
|
|
free(a);
|
|
} else {
|
|
d = d->next;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Find, remove and free answers and scheduled packets for service
|
|
*/
|
|
static void _mdns_remove_scheduled_service_packets(mdns_service_t * service)
|
|
{
|
|
mdns_tx_packet_t * p = NULL;
|
|
mdns_tx_packet_t * q = _mdns_server->tx_queue_head;
|
|
while (q) {
|
|
bool had_answers = (q->answers != NULL);
|
|
|
|
_mdns_dealloc_scheduled_service_answers(&(q->answers), service);
|
|
_mdns_dealloc_scheduled_service_answers(&(q->additional), service);
|
|
_mdns_dealloc_scheduled_service_answers(&(q->servers), service);
|
|
|
|
|
|
mdns_pcb_t * _pcb = &_mdns_server->interfaces[q->tcpip_if].pcbs[q->ip_protocol];
|
|
if(_pcb->pcb) {
|
|
if (PCB_STATE_IS_PROBING(_pcb)) {
|
|
uint8_t i;
|
|
//check if we are probing this service
|
|
for (i=0; i<_pcb->probe_services_len; i++) {
|
|
mdns_srv_item_t * s = _pcb->probe_services[i];
|
|
if (s->service == service){
|
|
break;
|
|
}
|
|
}
|
|
if (i < _pcb->probe_services_len) {
|
|
if (_pcb->probe_services_len > 1) {
|
|
uint8_t n;
|
|
for (n=(i+1); n<_pcb->probe_services_len; n++) {
|
|
_pcb->probe_services[n-1] = _pcb->probe_services[n];
|
|
}
|
|
_pcb->probe_services_len--;
|
|
} else {
|
|
_pcb->probe_services_len = 0;
|
|
free(_pcb->probe_services);
|
|
_pcb->probe_services = NULL;
|
|
if (!_pcb->probe_ip) {
|
|
_pcb->probe_running = false;
|
|
_pcb->state = PCB_RUNNING;
|
|
}
|
|
}
|
|
|
|
if (q->questions) {
|
|
mdns_out_question_t * qsn = NULL;
|
|
mdns_out_question_t * qs = q->questions;
|
|
if (qs->type == MDNS_TYPE_ANY
|
|
&& qs->service && strcmp(qs->service, service->service) == 0
|
|
&& qs->proto && strcmp(qs->proto, service->proto) == 0)
|
|
{
|
|
q->questions = q->questions->next;
|
|
free(qs);
|
|
} else while (qs->next) {
|
|
qsn = qs->next;
|
|
if (qsn->type == MDNS_TYPE_ANY
|
|
&& qsn->service && strcmp(qsn->service, service->service) == 0
|
|
&& qsn->proto && strcmp(qsn->proto, service->proto) == 0)
|
|
{
|
|
qs->next = qsn->next;
|
|
free(qsn);
|
|
break;
|
|
}
|
|
qs = qs->next;
|
|
}
|
|
}
|
|
}
|
|
} else if (PCB_STATE_IS_ANNOUNCING(_pcb)) {
|
|
//if answers were cleared, set to running
|
|
if (had_answers && q->answers == NULL) {
|
|
_pcb->state = PCB_RUNNING;
|
|
}
|
|
}
|
|
}
|
|
|
|
p = q;
|
|
q = q->next;
|
|
if(!p->questions && !p->answers && !p->additional && !p->servers){
|
|
queueDetach(mdns_tx_packet_t, _mdns_server->tx_queue_head, p);
|
|
_mdns_free_tx_packet(p);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief free service memory
|
|
*
|
|
* @param service the service
|
|
*/
|
|
static void _mdns_free_service(mdns_service_t * service)
|
|
{
|
|
if (!service) {
|
|
return;
|
|
}
|
|
_mdns_remove_scheduled_service_packets(service);
|
|
free((char *)service->instance);
|
|
free((char *)service->service);
|
|
free((char *)service->proto);
|
|
while (service->txt) {
|
|
mdns_txt_linked_item_t * s = service->txt;
|
|
service->txt = service->txt->next;
|
|
free((char *)s->key);
|
|
free((char *)s->value);
|
|
free(s);
|
|
}
|
|
free(service->txt);
|
|
free(service);
|
|
}
|
|
|
|
|
|
/*
|
|
* Received Packet Handling
|
|
* */
|
|
|
|
/**
|
|
* @brief Detect SRV collision
|
|
*/
|
|
static int _mdns_check_srv_collision(mdns_service_t * service, uint16_t priority, uint16_t weight, uint16_t port, const char * host, const char * domain)
|
|
{
|
|
if (_str_null_or_empty(_mdns_server->hostname)) {
|
|
return 0;
|
|
}
|
|
|
|
size_t our_host_len = strlen(_mdns_server->hostname);
|
|
size_t our_len = 14 + our_host_len;
|
|
|
|
size_t their_host_len = strlen(host);
|
|
size_t their_domain_len = strlen(domain);
|
|
size_t their_len = 9 + their_host_len + their_domain_len;
|
|
|
|
if (their_len > our_len) {
|
|
return 1;//they win
|
|
} else if (their_len < our_len) {
|
|
return -1;//we win
|
|
}
|
|
|
|
uint16_t our_index = 0;
|
|
uint8_t our_data[our_len];
|
|
_mdns_append_u16(our_data, &our_index, service->priority);
|
|
_mdns_append_u16(our_data, &our_index, service->weight);
|
|
_mdns_append_u16(our_data, &our_index, service->port);
|
|
our_data[our_index++] = our_host_len;
|
|
memcpy(our_data + our_index, _mdns_server->hostname, our_host_len);
|
|
our_index += our_host_len;
|
|
our_data[our_index++] = 5;
|
|
memcpy(our_data + our_index, MDNS_DEFAULT_DOMAIN, 5);
|
|
our_index += 5;
|
|
our_data[our_index++] = 0;
|
|
|
|
uint16_t their_index = 0;
|
|
uint8_t their_data[their_len];
|
|
_mdns_append_u16(their_data, &their_index, priority);
|
|
_mdns_append_u16(their_data, &their_index, weight);
|
|
_mdns_append_u16(their_data, &their_index, port);
|
|
their_data[their_index++] = their_host_len;
|
|
memcpy(their_data + their_index, host, their_host_len);
|
|
their_index += their_host_len;
|
|
their_data[their_index++] = their_domain_len;
|
|
memcpy(their_data + their_index, domain, their_domain_len);
|
|
their_index += their_domain_len;
|
|
their_data[their_index++] = 0;
|
|
|
|
int ret = memcmp(our_data, their_data, our_len);
|
|
if (ret > 0) {
|
|
return -1;//we win
|
|
} else if (ret < 0) {
|
|
return 1;//they win
|
|
}
|
|
return 0;//same
|
|
}
|
|
|
|
/**
|
|
* @brief Detect TXT collision
|
|
*/
|
|
static int _mdns_check_txt_collision(mdns_service_t * service, const uint8_t * data, size_t len)
|
|
{
|
|
size_t data_len = 1;
|
|
if (len == 1 && service->txt) {
|
|
return -1;//we win
|
|
} else if (len > 1 && !service->txt) {
|
|
return 1;//they win
|
|
} else if (len == 1 && !service->txt) {
|
|
return 0;//same
|
|
}
|
|
|
|
mdns_txt_linked_item_t * txt = service->txt;
|
|
while (txt) {
|
|
data_len += 2 + strlen(service->txt->key) + strlen(service->txt->value);
|
|
txt = txt->next;
|
|
}
|
|
|
|
if (len > data_len) {
|
|
return 1;//they win
|
|
} else if (len < data_len) {
|
|
return -1;//we win
|
|
}
|
|
|
|
uint8_t ours[len];
|
|
uint16_t index = 0;
|
|
char * tmp;
|
|
|
|
txt = service->txt;
|
|
while (txt) {
|
|
tmp = (char *)malloc(2 + strlen(txt->key) + strlen(txt->value));
|
|
if (tmp) {
|
|
sprintf(tmp, "%s=%s", txt->key, txt->value);
|
|
_mdns_append_string(ours, &index, tmp);
|
|
free(tmp);
|
|
}
|
|
txt = txt->next;
|
|
}
|
|
|
|
int ret = memcmp(ours, data, len);
|
|
if (ret > 0) {
|
|
return -1;//we win
|
|
} else if (ret < 0) {
|
|
return 1;//they win
|
|
}
|
|
return 0;//same
|
|
}
|
|
|
|
/**
|
|
* @brief Set interface as duplicate if another is found on the same subnet
|
|
*/
|
|
static void _mdns_dup_interface(tcpip_adapter_if_t tcpip_if)
|
|
{
|
|
uint8_t i;
|
|
tcpip_adapter_if_t other_if = _mdns_get_other_if (tcpip_if);
|
|
for (i=0; i<MDNS_IP_PROTOCOL_MAX; i++) {
|
|
if (_mdns_server->interfaces[other_if].pcbs[i].pcb) {
|
|
//stop this interface and mark as dup
|
|
if (_mdns_server->interfaces[tcpip_if].pcbs[i].pcb) {
|
|
_mdns_clear_pcb_tx_queue_head(tcpip_if, i);
|
|
_mdns_pcb_deinit(tcpip_if, i);
|
|
}
|
|
_mdns_server->interfaces[tcpip_if].pcbs[i].state = PCB_DUP;
|
|
_mdns_announce_pcb(other_if, i, NULL, 0, true);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Detect IPv4 address collision
|
|
*/
|
|
static int _mdns_check_a_collision(ip4_addr_t * ip, tcpip_adapter_if_t tcpip_if)
|
|
{
|
|
tcpip_adapter_ip_info_t if_ip_info;
|
|
tcpip_adapter_ip_info_t other_ip_info;
|
|
if (!ip->addr) {
|
|
return 1;//denial! they win
|
|
}
|
|
if (tcpip_adapter_get_ip_info(tcpip_if, &if_ip_info)) {
|
|
return 1;//they win
|
|
}
|
|
|
|
int ret = memcmp((uint8_t*)&if_ip_info.ip.addr, (uint8_t*)&ip->addr, sizeof(ip4_addr_t));
|
|
if (ret > 0) {
|
|
return -1;//we win
|
|
} else if (ret < 0) {
|
|
//is it the other interface?
|
|
tcpip_adapter_if_t other_if = _mdns_get_other_if (tcpip_if);
|
|
if (other_if == TCPIP_ADAPTER_IF_MAX) {
|
|
return 1;//AP interface! They win
|
|
}
|
|
if (tcpip_adapter_get_ip_info(other_if, &other_ip_info)) {
|
|
return 1;//IPv4 not active! They win
|
|
}
|
|
if (ip->addr != other_ip_info.ip.addr) {
|
|
return 1;//IPv4 not ours! They win
|
|
}
|
|
_mdns_dup_interface(tcpip_if);
|
|
return 2;//they win
|
|
}
|
|
return 0;//same
|
|
}
|
|
|
|
/**
|
|
* @brief Detect IPv6 address collision
|
|
*/
|
|
static int _mdns_check_aaaa_collision(ip6_addr_t * ip, tcpip_adapter_if_t tcpip_if)
|
|
{
|
|
struct ip6_addr if_ip6;
|
|
struct ip6_addr other_ip6;
|
|
if (_ipv6_address_is_zero(*ip)) {
|
|
return 1;//denial! they win
|
|
}
|
|
if (tcpip_adapter_get_ip6_linklocal(tcpip_if, &if_ip6)) {
|
|
return 1;//they win
|
|
}
|
|
int ret = memcmp((uint8_t*)&if_ip6.addr, (uint8_t*)ip->addr, sizeof(ip6_addr_t));
|
|
if (ret > 0) {
|
|
return -1;//we win
|
|
} else if (ret < 0) {
|
|
//is it the other interface?
|
|
tcpip_adapter_if_t other_if = _mdns_get_other_if (tcpip_if);
|
|
if (other_if == TCPIP_ADAPTER_IF_MAX) {
|
|
return 1;//AP interface! They win
|
|
}
|
|
if (tcpip_adapter_get_ip6_linklocal(other_if, &other_ip6)) {
|
|
return 1;//IPv6 not active! They win
|
|
}
|
|
if (memcmp((uint8_t*)&other_ip6.addr, (uint8_t*)ip->addr, sizeof(ip6_addr_t))) {
|
|
return 1;//IPv6 not ours! They win
|
|
}
|
|
_mdns_dup_interface(tcpip_if);
|
|
return 2;//they win
|
|
}
|
|
return 0;//same
|
|
}
|
|
|
|
/**
|
|
* @brief Check if parsed name is discovery
|
|
*/
|
|
static bool _mdns_name_is_discovery(mdns_name_t * name, uint16_t type)
|
|
{
|
|
return (
|
|
(name->host && name->host[0] && !strcasecmp(name->host, "_services"))
|
|
&& (name->service && name->service[0] && !strcasecmp(name->service, "_dns-sd"))
|
|
&& (name->proto && name->proto[0] && !strcasecmp(name->proto, "_udp"))
|
|
&& (name->domain && name->domain[0] && !strcasecmp(name->domain, MDNS_DEFAULT_DOMAIN))
|
|
&& type == MDNS_TYPE_PTR
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @brief Check if the parsed name is ours (matches service or host name)
|
|
*/
|
|
static bool _mdns_name_is_ours(mdns_name_t * name)
|
|
{
|
|
//domain have to be "local"
|
|
if (_str_null_or_empty(name->domain) || strcasecmp(name->domain, MDNS_DEFAULT_DOMAIN)) {
|
|
return false;
|
|
}
|
|
|
|
//if service and proto are empty, host must match out hostname
|
|
if (_str_null_or_empty(name->service) && _str_null_or_empty(name->proto)) {
|
|
if (!_str_null_or_empty(name->host)
|
|
&& !_str_null_or_empty(_mdns_server->hostname)
|
|
&& strcasecmp(name->host, _mdns_server->hostname) == 0)
|
|
{
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
//if service or proto is empty, name is invalid
|
|
if (_str_null_or_empty(name->service) || _str_null_or_empty(name->proto)) {
|
|
return false;
|
|
}
|
|
|
|
//find the service
|
|
mdns_srv_item_t * service = _mdns_get_service_item(name->service, name->proto);
|
|
if (!service) {
|
|
return false;
|
|
}
|
|
|
|
//if host is empty and we have service, we have success
|
|
if (_str_null_or_empty(name->host)) {
|
|
return true;
|
|
}
|
|
|
|
//OK we have host in the name. find what is the instance of the service
|
|
const char * instance = _mdns_get_service_instance_name(service->service);
|
|
if (instance == NULL) {
|
|
return false;
|
|
}
|
|
|
|
//compare the instance against the name
|
|
if (strcasecmp(name->host, instance) == 0) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @brief read uint16_t from a packet
|
|
* @param packet the packet
|
|
* @param index index in the packet where the value starts
|
|
*
|
|
* @return the value
|
|
*/
|
|
static inline uint16_t _mdns_read_u16(const uint8_t * packet, uint16_t index)
|
|
{
|
|
return (uint16_t)(packet[index]) << 8 | packet[index+1];
|
|
}
|
|
|
|
/**
|
|
* @brief read uint32_t from a packet
|
|
* @param packet the packet
|
|
* @param index index in the packet where the value starts
|
|
*
|
|
* @return the value
|
|
*/
|
|
static inline uint32_t _mdns_read_u32(const uint8_t * packet, uint16_t index)
|
|
{
|
|
return (uint32_t)(packet[index]) << 24 | (uint32_t)(packet[index+1]) << 16 | (uint32_t)(packet[index+2]) << 8 | packet[index+3];
|
|
}
|
|
|
|
/**
|
|
* @brief reads and formats MDNS FQDN into mdns_name_t structure
|
|
*
|
|
* @param packet MDNS packet
|
|
* @param start Starting point of FQDN
|
|
* @param name mdns_name_t structure to populate
|
|
*
|
|
* @return the address after the parsed FQDN in the packet or NULL on error
|
|
*/
|
|
static const uint8_t * _mdns_parse_fqdn(const uint8_t * packet, const uint8_t * start, mdns_name_t * name)
|
|
{
|
|
name->parts = 0;
|
|
name->sub = 0;
|
|
name->host[0] = 0;
|
|
name->service[0] = 0;
|
|
name->proto[0] = 0;
|
|
name->domain[0] = 0;
|
|
|
|
static char buf[MDNS_NAME_BUF_LEN];
|
|
|
|
const uint8_t * next_data = (uint8_t*)_mdns_read_fqdn(packet, start, name, buf);
|
|
if (!next_data) {
|
|
return 0;
|
|
}
|
|
if (!name->parts) {
|
|
return next_data;
|
|
}
|
|
if (name->parts == 3) {
|
|
memmove((uint8_t*)name + (MDNS_NAME_BUF_LEN), (uint8_t*)name, 3*(MDNS_NAME_BUF_LEN));
|
|
name->host[0] = 0;
|
|
} else if (name->parts == 2) {
|
|
memmove((uint8_t*)(name->domain), (uint8_t*)(name->service), (MDNS_NAME_BUF_LEN));
|
|
name->service[0] = 0;
|
|
name->proto[0] = 0;
|
|
}
|
|
if (strcasecmp(name->domain, MDNS_DEFAULT_DOMAIN) == 0 || strcasecmp(name->domain, "arpa") == 0) {
|
|
return next_data;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Called from parser to check if question matches particular service
|
|
*/
|
|
static bool _mdns_question_matches(mdns_parsed_question_t * question, uint16_t type, mdns_srv_item_t * service)
|
|
{
|
|
if (question->type != type) {
|
|
return false;
|
|
}
|
|
if (type == MDNS_TYPE_A || type == MDNS_TYPE_AAAA) {
|
|
return true;
|
|
} else if (type == MDNS_TYPE_PTR || type == MDNS_TYPE_SDPTR) {
|
|
if (!strcasecmp(service->service->service, question->service)
|
|
&& !strcasecmp(service->service->proto, question->proto)
|
|
&& !strcasecmp(MDNS_DEFAULT_DOMAIN, question->domain)) {
|
|
return true;
|
|
}
|
|
} else if (type == MDNS_TYPE_SRV || type == MDNS_TYPE_TXT) {
|
|
const char * name = _mdns_get_service_instance_name(service->service);
|
|
if (name && question->host && !strcasecmp(name, question->host)
|
|
&& !strcasecmp(service->service->service, question->service)
|
|
&& !strcasecmp(service->service->proto, question->proto)
|
|
&& !strcasecmp(MDNS_DEFAULT_DOMAIN, question->domain)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @brief Removes saved question from parsed data
|
|
*/
|
|
static void _mdns_remove_parsed_question(mdns_parsed_packet_t * parsed_packet, uint16_t type, mdns_srv_item_t * service)
|
|
{
|
|
mdns_parsed_question_t * q = parsed_packet->questions;
|
|
|
|
if (_mdns_question_matches(q, type, service)) {
|
|
parsed_packet->questions = q->next;
|
|
free(q->host);
|
|
free(q->service);
|
|
free(q->proto);
|
|
free(q->domain);
|
|
free(q);
|
|
return;
|
|
}
|
|
|
|
while (q->next) {
|
|
mdns_parsed_question_t * p = q->next;
|
|
if (_mdns_question_matches(p, type, service)) {
|
|
q->next = p->next;
|
|
free(p->host);
|
|
free(p->service);
|
|
free(p->proto);
|
|
free(p->domain);
|
|
free(p);
|
|
return;
|
|
}
|
|
q = q->next;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Get number of items in TXT parsed data
|
|
*/
|
|
static int _mdns_txt_items_count_get(const uint8_t * data, size_t len)
|
|
{
|
|
if (len == 1) {
|
|
return 0;
|
|
}
|
|
|
|
int num_items = 0;
|
|
uint16_t i=0;
|
|
size_t partLen = 0;
|
|
|
|
while (i < len) {
|
|
partLen = data[i++];
|
|
if (!partLen) {
|
|
break;
|
|
}
|
|
if ((i+partLen) > len) {
|
|
return -1;//error
|
|
}
|
|
i+=partLen;
|
|
num_items++;
|
|
}
|
|
return num_items;
|
|
}
|
|
|
|
/**
|
|
* @brief Get the length of TXT item's key name
|
|
*/
|
|
static int _mdns_txt_item_name_get_len(const uint8_t * data, size_t len)
|
|
{
|
|
int i;
|
|
if (*data == '=') {
|
|
return -1;
|
|
}
|
|
for (i = 0; i < len; i++) {
|
|
if (data[i] == '=') {
|
|
return i;
|
|
}
|
|
}
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* @brief Create TXT result array from parsed TXT data
|
|
*/
|
|
static void _mdns_result_txt_create(const uint8_t * data, size_t len, mdns_txt_item_t ** out_txt, size_t * out_count)
|
|
{
|
|
*out_txt = NULL;
|
|
*out_count = 0;
|
|
uint16_t i=0, y;
|
|
size_t partLen = 0;
|
|
int num_items = _mdns_txt_items_count_get(data, len);
|
|
if (num_items < 0) {
|
|
return;//error
|
|
}
|
|
|
|
if (!num_items) {
|
|
return;
|
|
}
|
|
|
|
mdns_txt_item_t * txt = (mdns_txt_item_t *)malloc(sizeof(mdns_txt_item_t) * num_items);
|
|
memset(txt, 0, sizeof(mdns_txt_item_t) * num_items);
|
|
size_t txt_num = 0;
|
|
|
|
while (i < len) {
|
|
partLen = data[i++];
|
|
if (!partLen) {
|
|
break;
|
|
}
|
|
|
|
if ((i+partLen) > len) {
|
|
goto handle_error;//error
|
|
}
|
|
|
|
int name_len = _mdns_txt_item_name_get_len(data+i, partLen);
|
|
if (name_len < 0) {//invalid item (no name)
|
|
i += partLen;
|
|
continue;
|
|
}
|
|
char * key = (char *)malloc(name_len + 1);
|
|
if (!key) {
|
|
goto handle_error;//error
|
|
}
|
|
|
|
mdns_txt_item_t * t = &txt[txt_num++];
|
|
|
|
memcpy(key, data + i, name_len);
|
|
key[name_len] = 0;
|
|
i += name_len + 1;
|
|
t->key = key;
|
|
|
|
int value_len = partLen - name_len - 1;
|
|
if (value_len > 0) {
|
|
char * value = (char *)malloc(value_len + 1);
|
|
memcpy(value, data + i, value_len);
|
|
value[value_len] = 0;
|
|
i += value_len;
|
|
t->value = value;
|
|
}
|
|
}
|
|
|
|
*out_txt = txt;
|
|
*out_count = txt_num;
|
|
return;
|
|
|
|
handle_error :
|
|
for (y=0; y<txt_num; y++) {
|
|
mdns_txt_item_t * t = &txt[y];
|
|
free((char *)t->key);
|
|
free((char *)t->value);
|
|
}
|
|
free(txt);
|
|
}
|
|
|
|
/**
|
|
* @brief Duplicate string or return error
|
|
*/
|
|
static esp_err_t _mdns_strdup_check(char ** out, char * in)
|
|
{
|
|
if (in && in[0]) {
|
|
*out = strdup(in);
|
|
if (!*out) {
|
|
return ESP_FAIL;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
*out = NULL;
|
|
return ESP_OK;
|
|
}
|
|
|
|
/**
|
|
* @brief main packet parser
|
|
*
|
|
* @param packet the packet
|
|
*/
|
|
void mdns_parse_packet(mdns_rx_packet_t * packet)
|
|
{
|
|
static mdns_name_t n;
|
|
mdns_header_t header;
|
|
const uint8_t * data = (const uint8_t*)packet->pb->payload;
|
|
size_t len = packet->pb->len;
|
|
const uint8_t * content = data + MDNS_HEAD_LEN;
|
|
bool do_not_reply = false;
|
|
mdns_search_once_t * search_result = NULL;
|
|
|
|
#ifdef MDNS_ENABLE_DEBUG
|
|
_mdns_dbg_printf("\nRX[%u][%u]: ", packet->tcpip_if, (uint32_t)packet->ip_protocol);
|
|
if (packet->src.type == IPADDR_TYPE_V4) {
|
|
_mdns_dbg_printf("From: " IPSTR ":%u, To: " IPSTR ", ", IP2STR(&packet->src.u_addr.ip4), packet->src_port, IP2STR(&packet->dest.u_addr.ip4));
|
|
} else {
|
|
_mdns_dbg_printf("From: " IPV6STR ":%u, To: " IPV6STR ", ", IPV62STR(packet->src.u_addr.ip6), packet->src_port, IPV62STR(packet->dest.u_addr.ip6));
|
|
}
|
|
mdns_debug_packet(data, len);
|
|
#endif
|
|
|
|
mdns_parsed_packet_t * parsed_packet = (mdns_parsed_packet_t *)malloc(sizeof(mdns_parsed_packet_t));
|
|
if (!parsed_packet) {
|
|
return;
|
|
}
|
|
memset(parsed_packet, 0, sizeof(mdns_parsed_packet_t));
|
|
|
|
mdns_name_t * name = &n;
|
|
memset(name, 0, sizeof(mdns_name_t));
|
|
|
|
header.id = _mdns_read_u16(data, MDNS_HEAD_ID_OFFSET);
|
|
header.flags.value = _mdns_read_u16(data, MDNS_HEAD_FLAGS_OFFSET);
|
|
header.questions = _mdns_read_u16(data, MDNS_HEAD_QUESTIONS_OFFSET);
|
|
header.answers = _mdns_read_u16(data, MDNS_HEAD_ANSWERS_OFFSET);
|
|
header.servers = _mdns_read_u16(data, MDNS_HEAD_SERVERS_OFFSET);
|
|
header.additional = _mdns_read_u16(data, MDNS_HEAD_ADDITIONAL_OFFSET);
|
|
|
|
if (header.flags.value == MDNS_FLAGS_AUTHORITATIVE && packet->src_port != MDNS_SERVICE_PORT) {
|
|
free(parsed_packet);
|
|
return;
|
|
}
|
|
|
|
//if we have not set the hostname, we can not answer questions
|
|
if (header.questions && _str_null_or_empty(_mdns_server->hostname)) {
|
|
free(parsed_packet);
|
|
return;
|
|
}
|
|
|
|
parsed_packet->tcpip_if = packet->tcpip_if;
|
|
parsed_packet->ip_protocol = packet->ip_protocol;
|
|
parsed_packet->multicast = packet->multicast;
|
|
parsed_packet->authoritative = header.flags.value == MDNS_FLAGS_AUTHORITATIVE;
|
|
parsed_packet->distributed = header.flags.value == MDNS_FLAGS_DISTRIBUTED;
|
|
ip_addr_copy(parsed_packet->src, packet->src);
|
|
parsed_packet->src_port = packet->src_port;
|
|
|
|
if (header.questions) {
|
|
uint8_t qs = header.questions;
|
|
|
|
while (qs--) {
|
|
content = _mdns_parse_fqdn(data, content, name);
|
|
if (!content) {
|
|
header.answers = 0;
|
|
header.additional = 0;
|
|
header.servers = 0;
|
|
goto clear_rx_packet;//error
|
|
}
|
|
|
|
uint16_t type = _mdns_read_u16(content, MDNS_TYPE_OFFSET);
|
|
uint16_t clas = _mdns_read_u16(content, MDNS_CLASS_OFFSET);
|
|
bool unicast = !!(clas & 0x8000);
|
|
clas &= 0x7FFF;
|
|
content = content + 4;
|
|
|
|
if (clas != 0x0001) {//bad class
|
|
continue;
|
|
}
|
|
|
|
if (_mdns_name_is_discovery(name, type)) {
|
|
//service discovery
|
|
parsed_packet->discovery = true;
|
|
mdns_srv_item_t * a = _mdns_server->services;
|
|
while (a) {
|
|
mdns_parsed_question_t * question = (mdns_parsed_question_t *)malloc(sizeof(mdns_parsed_question_t));
|
|
if (!question) {
|
|
goto clear_rx_packet;
|
|
}
|
|
question->next = parsed_packet->questions;
|
|
parsed_packet->questions = question;
|
|
|
|
question->unicast = unicast;
|
|
question->type = MDNS_TYPE_SDPTR;
|
|
question->host = NULL;
|
|
question->service = strdup(a->service->service);
|
|
question->proto = strdup(a->service->proto);
|
|
question->domain = strdup(MDNS_DEFAULT_DOMAIN);
|
|
if (!question->service || !question->proto || !question->domain) {
|
|
goto clear_rx_packet;
|
|
}
|
|
a = a->next;
|
|
}
|
|
continue;
|
|
} else if (name->sub || !_mdns_name_is_ours(name)) {
|
|
continue;
|
|
}
|
|
|
|
if (type == MDNS_TYPE_ANY) {
|
|
parsed_packet->probe = true;
|
|
}
|
|
|
|
mdns_parsed_question_t * question = (mdns_parsed_question_t *)malloc(sizeof(mdns_parsed_question_t));
|
|
if (!question) {
|
|
goto clear_rx_packet;
|
|
}
|
|
question->next = parsed_packet->questions;
|
|
parsed_packet->questions = question;
|
|
|
|
question->unicast = unicast;
|
|
question->type = type;
|
|
if (_mdns_strdup_check(&(question->host), name->host)
|
|
|| _mdns_strdup_check(&(question->service), name->service)
|
|
|| _mdns_strdup_check(&(question->proto), name->proto)
|
|
|| _mdns_strdup_check(&(question->domain), name->domain)) {
|
|
goto clear_rx_packet;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (header.questions && !parsed_packet->questions && !parsed_packet->discovery) {
|
|
goto clear_rx_packet;
|
|
} else if (header.answers || header.servers || header.additional) {
|
|
uint16_t recordIndex = 0;
|
|
|
|
while (content < (data + len)) {
|
|
|
|
content = _mdns_parse_fqdn(data, content, name);
|
|
if (!content) {
|
|
goto clear_rx_packet;//error
|
|
}
|
|
|
|
uint16_t type = _mdns_read_u16(content, MDNS_TYPE_OFFSET);
|
|
uint16_t clas = _mdns_read_u16(content, MDNS_CLASS_OFFSET);
|
|
uint32_t ttl = _mdns_read_u32(content, MDNS_TTL_OFFSET);
|
|
uint16_t data_len = _mdns_read_u16(content, MDNS_LEN_OFFSET);
|
|
const uint8_t * data_ptr = content + MDNS_DATA_OFFSET;
|
|
clas &= 0x7FFF;
|
|
|
|
content = data_ptr + data_len;
|
|
if (content > (data + len)) {
|
|
goto clear_rx_packet;
|
|
}
|
|
|
|
bool discovery = false;
|
|
bool ours = false;
|
|
mdns_srv_item_t * service = NULL;
|
|
mdns_parsed_recort_type_t record_type = MDNS_ANSWER;
|
|
|
|
if (recordIndex >= (header.answers + header.servers)) {
|
|
record_type = MDNS_EXTRA;
|
|
} else if (recordIndex >= (header.answers)) {
|
|
record_type = MDNS_NS;
|
|
}
|
|
recordIndex++;
|
|
|
|
if (type == MDNS_TYPE_NSEC || type == MDNS_TYPE_OPT) {
|
|
//skip NSEC and OPT
|
|
continue;
|
|
}
|
|
|
|
if (parsed_packet->discovery && _mdns_name_is_discovery(name, type)) {
|
|
discovery = true;
|
|
} else if (!name->sub && _mdns_name_is_ours(name)) {
|
|
ours = true;
|
|
if (name->service && name->service[0] && name->proto && name->proto[0]) {
|
|
service = _mdns_get_service_item(name->service, name->proto);
|
|
}
|
|
} else {
|
|
if (header.questions || !parsed_packet->authoritative || record_type == MDNS_NS) {
|
|
//skip this record
|
|
continue;
|
|
}
|
|
search_result = _mdns_search_find_from(_mdns_server->search_once, name, type, packet->tcpip_if, packet->ip_protocol);
|
|
}
|
|
|
|
if (type == MDNS_TYPE_PTR) {
|
|
if (!_mdns_parse_fqdn(data, data_ptr, name)) {
|
|
continue;//error
|
|
}
|
|
if (search_result) {
|
|
_mdns_search_result_add_ptr(search_result, name->host, packet->tcpip_if, packet->ip_protocol);
|
|
} else if ((discovery || ours) && !name->sub && _mdns_name_is_ours(name)) {
|
|
if (discovery) {
|
|
service = _mdns_get_service_item(name->service, name->proto);
|
|
_mdns_remove_parsed_question(parsed_packet, MDNS_TYPE_SDPTR, service);
|
|
} else if (parsed_packet->questions && !parsed_packet->probe) {
|
|
_mdns_remove_parsed_question(parsed_packet, type, service);
|
|
} else {
|
|
//check if TTL is more than half of the full TTL value (4500)
|
|
if (ttl > 2250) {
|
|
_mdns_remove_scheduled_answer(packet->tcpip_if, packet->ip_protocol, type, service);
|
|
}
|
|
}
|
|
}
|
|
} else if (type == MDNS_TYPE_SRV) {
|
|
mdns_result_t * result = NULL;
|
|
if (search_result && search_result->type == MDNS_TYPE_PTR) {
|
|
result = search_result->result;
|
|
while (result) {
|
|
if (packet->tcpip_if == result->tcpip_if
|
|
&& packet->ip_protocol == result->ip_protocol
|
|
&& result->instance_name && !strcmp(name->host, result->instance_name)) {
|
|
break;
|
|
}
|
|
result = result->next;
|
|
}
|
|
if (!result) {
|
|
result = _mdns_search_result_add_ptr(search_result, name->host, packet->tcpip_if, packet->ip_protocol);
|
|
if (!result) {
|
|
continue;//error
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!_mdns_parse_fqdn(data, data_ptr + MDNS_SRV_FQDN_OFFSET, name)) {
|
|
continue;//error
|
|
}
|
|
uint16_t priority = _mdns_read_u16(data_ptr, MDNS_SRV_PRIORITY_OFFSET);
|
|
uint16_t weight = _mdns_read_u16(data_ptr, MDNS_SRV_WEIGHT_OFFSET);
|
|
uint16_t port = _mdns_read_u16(data_ptr, MDNS_SRV_PORT_OFFSET);
|
|
|
|
if (search_result) {
|
|
if (search_result->type == MDNS_TYPE_PTR) {
|
|
result->port = port;
|
|
result->hostname = strdup(name->host);
|
|
} else {
|
|
_mdns_search_result_add_srv(search_result, name->host, port, packet->tcpip_if, packet->ip_protocol);
|
|
}
|
|
} else if (ours) {
|
|
if (parsed_packet->questions && !parsed_packet->probe) {
|
|
_mdns_remove_parsed_question(parsed_packet, type, service);
|
|
continue;
|
|
} else if (parsed_packet->distributed) {
|
|
_mdns_remove_scheduled_answer(packet->tcpip_if, packet->ip_protocol, type, service);
|
|
continue;
|
|
}
|
|
//detect collision (-1=won, 0=none, 1=lost)
|
|
int col = 0;
|
|
if (clas > 1) {
|
|
col = 1;
|
|
} else if (!clas) {
|
|
col = -1;
|
|
} else {
|
|
col = _mdns_check_srv_collision(service->service, priority, weight, port, name->host, name->domain);
|
|
}
|
|
if (col && (parsed_packet->probe || parsed_packet->authoritative)) {
|
|
if (col > 0 || !port) {
|
|
do_not_reply = true;
|
|
if (_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
|
|
_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].failed_probes++;
|
|
if (!_str_null_or_empty(service->service->instance)) {
|
|
char * new_instance = _mdns_mangle_name((char *)service->service->instance);
|
|
if (new_instance) {
|
|
free((char *)service->service->instance);
|
|
service->service->instance = new_instance;
|
|
}
|
|
_mdns_probe_all_pcbs(&service, 1, false, false);
|
|
} else if (!_str_null_or_empty(_mdns_server->instance)) {
|
|
char * new_instance = _mdns_mangle_name((char *)_mdns_server->instance);
|
|
if (new_instance) {
|
|
free((char *)_mdns_server->instance);
|
|
_mdns_server->instance = new_instance;
|
|
}
|
|
_mdns_restart_all_pcbs_no_instance();
|
|
} else {
|
|
char * new_host = _mdns_mangle_name((char *)_mdns_server->hostname);
|
|
if (new_host) {
|
|
free((char *)_mdns_server->hostname);
|
|
_mdns_server->hostname = new_host;
|
|
}
|
|
_mdns_restart_all_pcbs();
|
|
}
|
|
} else {
|
|
_mdns_pcb_send_bye(packet->tcpip_if, packet->ip_protocol, &service, 1, false);
|
|
_mdns_init_pcb_probe(packet->tcpip_if, packet->ip_protocol, &service, 1, false);
|
|
}
|
|
}
|
|
} else if (ttl > 60 && !col && !parsed_packet->authoritative && !parsed_packet->probe && !parsed_packet->questions) {
|
|
_mdns_remove_scheduled_answer(packet->tcpip_if, packet->ip_protocol, type, service);
|
|
}
|
|
}
|
|
} else if (type == MDNS_TYPE_TXT) {
|
|
if (search_result) {
|
|
mdns_txt_item_t * txt = NULL;
|
|
size_t txt_count = 0;
|
|
_mdns_result_txt_create(data_ptr, data_len, &txt, &txt_count);
|
|
if (!txt_count) {
|
|
continue;
|
|
}
|
|
|
|
mdns_result_t * result = NULL;
|
|
if (search_result->type == MDNS_TYPE_PTR) {
|
|
result = search_result->result;
|
|
while (result) {
|
|
if (packet->tcpip_if == result->tcpip_if
|
|
&& packet->ip_protocol == result->ip_protocol
|
|
&& result->instance_name && !strcmp(name->host, result->instance_name)) {
|
|
break;
|
|
}
|
|
result = result->next;
|
|
}
|
|
if (!result) {
|
|
result = _mdns_search_result_add_ptr(search_result, name->host, packet->tcpip_if, packet->ip_protocol);
|
|
if (!result) {
|
|
continue;//error
|
|
}
|
|
}
|
|
if (!result->txt) {
|
|
result->txt = txt;
|
|
result->txt_count = txt_count;
|
|
}
|
|
} else {
|
|
_mdns_search_result_add_txt(search_result, txt, txt_count, packet->tcpip_if, packet->ip_protocol);
|
|
}
|
|
} else if (ours) {
|
|
if (parsed_packet->questions && !parsed_packet->probe) {
|
|
_mdns_remove_parsed_question(parsed_packet, type, service);
|
|
continue;
|
|
}
|
|
//detect collision (-1=won, 0=none, 1=lost)
|
|
int col = 0;
|
|
if (clas > 1) {
|
|
col = 1;
|
|
} else if (!clas) {
|
|
col = -1;
|
|
} else {
|
|
col = _mdns_check_txt_collision(service->service, data_ptr, data_len);
|
|
}
|
|
if (col && !_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
|
|
do_not_reply = true;
|
|
_mdns_init_pcb_probe(packet->tcpip_if, packet->ip_protocol, &service, 1, true);
|
|
} else if (ttl > 2250 && !col && !parsed_packet->authoritative && !parsed_packet->probe && !parsed_packet->questions && !_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
|
|
_mdns_remove_scheduled_answer(packet->tcpip_if, packet->ip_protocol, type, service);
|
|
}
|
|
}
|
|
|
|
} else if (type == MDNS_TYPE_AAAA) {//ipv6
|
|
ip_addr_t ip6;
|
|
ip6.type = IPADDR_TYPE_V6;
|
|
memcpy(ip6.u_addr.ip6.addr, data_ptr, 16);
|
|
if (search_result) {
|
|
//check for more applicable searches (PTR & A/AAAA at the same time)
|
|
while (search_result) {
|
|
_mdns_search_result_add_ip(search_result, name->host, &ip6, packet->tcpip_if, packet->ip_protocol);
|
|
search_result = _mdns_search_find_from(search_result->next, name, type, packet->tcpip_if, packet->ip_protocol);
|
|
}
|
|
} else if (ours) {
|
|
if (parsed_packet->questions && !parsed_packet->probe) {
|
|
_mdns_remove_parsed_question(parsed_packet, type, NULL);
|
|
continue;
|
|
}
|
|
//detect collision (-1=won, 0=none, 1=lost)
|
|
int col = 0;
|
|
if (clas > 1) {
|
|
col = 1;
|
|
} else if (!clas) {
|
|
col = -1;
|
|
} else {
|
|
col = _mdns_check_aaaa_collision(&(ip6.u_addr.ip6), packet->tcpip_if);
|
|
}
|
|
if (col == 2) {
|
|
goto clear_rx_packet;
|
|
} else if (col == 1) {
|
|
do_not_reply = true;
|
|
if (_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
|
|
if (col && (parsed_packet->probe || parsed_packet->authoritative)) {
|
|
_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].failed_probes++;
|
|
char * new_host = _mdns_mangle_name((char *)_mdns_server->hostname);
|
|
if (new_host) {
|
|
free((char *)_mdns_server->hostname);
|
|
_mdns_server->hostname = new_host;
|
|
}
|
|
_mdns_restart_all_pcbs();
|
|
}
|
|
} else {
|
|
_mdns_init_pcb_probe(packet->tcpip_if, packet->ip_protocol, NULL, 0, true);
|
|
}
|
|
} else if (ttl > 60 && !col && !parsed_packet->authoritative && !parsed_packet->probe && !parsed_packet->questions && !_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
|
|
_mdns_remove_scheduled_answer(packet->tcpip_if, packet->ip_protocol, type, NULL);
|
|
}
|
|
}
|
|
|
|
} else if (type == MDNS_TYPE_A) {
|
|
ip_addr_t ip;
|
|
ip.type = IPADDR_TYPE_V4;
|
|
memcpy(&(ip.u_addr.ip4.addr), data_ptr, 4);
|
|
if (search_result) {
|
|
//check for more applicable searches (PTR & A/AAAA at the same time)
|
|
while (search_result) {
|
|
_mdns_search_result_add_ip(search_result, name->host, &ip, packet->tcpip_if, packet->ip_protocol);
|
|
search_result = _mdns_search_find_from(search_result->next, name, type, packet->tcpip_if, packet->ip_protocol);
|
|
}
|
|
} else if (ours) {
|
|
if (parsed_packet->questions && !parsed_packet->probe) {
|
|
_mdns_remove_parsed_question(parsed_packet, type, NULL);
|
|
continue;
|
|
}
|
|
//detect collision (-1=won, 0=none, 1=lost)
|
|
int col = 0;
|
|
if (clas > 1) {
|
|
col = 1;
|
|
} else if (!clas) {
|
|
col = -1;
|
|
} else {
|
|
col = _mdns_check_a_collision(&(ip.u_addr.ip4), packet->tcpip_if);
|
|
}
|
|
if (col == 2) {
|
|
goto clear_rx_packet;
|
|
} else if (col == 1) {
|
|
do_not_reply = true;
|
|
if (_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
|
|
if (col && (parsed_packet->probe || parsed_packet->authoritative)) {
|
|
_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].failed_probes++;
|
|
char * new_host = _mdns_mangle_name((char *)_mdns_server->hostname);
|
|
if (new_host) {
|
|
free((char *)_mdns_server->hostname);
|
|
_mdns_server->hostname = new_host;
|
|
}
|
|
_mdns_restart_all_pcbs();
|
|
}
|
|
} else {
|
|
_mdns_init_pcb_probe(packet->tcpip_if, packet->ip_protocol, NULL, 0, true);
|
|
}
|
|
} else if (ttl > 60 && !col && !parsed_packet->authoritative && !parsed_packet->probe && !parsed_packet->questions && !_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
|
|
_mdns_remove_scheduled_answer(packet->tcpip_if, packet->ip_protocol, type, NULL);
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
//end while
|
|
if (parsed_packet->authoritative) {
|
|
_mdns_search_finish_done();
|
|
}
|
|
}
|
|
|
|
if (!do_not_reply && _mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].state > PCB_PROBE_3 && (parsed_packet->questions || parsed_packet->discovery)) {
|
|
_mdns_create_answer_from_parsed_packet(parsed_packet);
|
|
}
|
|
|
|
|
|
clear_rx_packet:
|
|
while (parsed_packet->questions) {
|
|
mdns_parsed_question_t * question = parsed_packet->questions;
|
|
parsed_packet->questions = parsed_packet->questions->next;
|
|
free(question->host);
|
|
free(question->service);
|
|
free(question->proto);
|
|
free(question->domain);
|
|
free(question);
|
|
}
|
|
free(parsed_packet);
|
|
}
|
|
|
|
/**
|
|
* @brief Enable mDNS interface
|
|
*/
|
|
void _mdns_enable_pcb(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
if (!_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].pcb) {
|
|
if (_mdns_pcb_init(tcpip_if, ip_protocol)) {
|
|
return;
|
|
}
|
|
}
|
|
_mdns_restart_pcb(tcpip_if, ip_protocol);
|
|
}
|
|
|
|
/**
|
|
* @brief Disable mDNS interface
|
|
*/
|
|
void _mdns_disable_pcb(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
if (_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].pcb) {
|
|
_mdns_clear_pcb_tx_queue_head(tcpip_if, ip_protocol);
|
|
_mdns_pcb_deinit(tcpip_if, ip_protocol);
|
|
tcpip_adapter_if_t other_if = _mdns_get_other_if (tcpip_if);
|
|
if (other_if != TCPIP_ADAPTER_IF_MAX && _mdns_server->interfaces[other_if].pcbs[ip_protocol].state == PCB_DUP) {
|
|
_mdns_server->interfaces[other_if].pcbs[ip_protocol].state = PCB_OFF;
|
|
_mdns_enable_pcb(other_if, ip_protocol);
|
|
}
|
|
}
|
|
_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].state = PCB_OFF;
|
|
}
|
|
|
|
/**
|
|
* @brief Dispatch interface changes based on system events
|
|
*/
|
|
void _mdns_handle_system_event(system_event_id_t event, tcpip_adapter_if_t interface)
|
|
{
|
|
if (!_mdns_server) {
|
|
return;
|
|
}
|
|
|
|
tcpip_adapter_dhcp_status_t dcst;
|
|
switch(event) {
|
|
case SYSTEM_EVENT_STA_CONNECTED:
|
|
if (!tcpip_adapter_dhcpc_get_status(TCPIP_ADAPTER_IF_STA, &dcst)) {
|
|
if (dcst != TCPIP_ADAPTER_DHCP_STARTED) {
|
|
_mdns_enable_pcb(TCPIP_ADAPTER_IF_STA, MDNS_IP_PROTOCOL_V4);
|
|
}
|
|
}
|
|
break;
|
|
case SYSTEM_EVENT_STA_GOT_IP:
|
|
_mdns_enable_pcb(TCPIP_ADAPTER_IF_STA, MDNS_IP_PROTOCOL_V4);
|
|
_mdns_announce_pcb(TCPIP_ADAPTER_IF_STA, MDNS_IP_PROTOCOL_V6, NULL, 0, true);
|
|
break;
|
|
case SYSTEM_EVENT_STA_DISCONNECTED:
|
|
_mdns_disable_pcb(TCPIP_ADAPTER_IF_STA, MDNS_IP_PROTOCOL_V4);
|
|
_mdns_disable_pcb(TCPIP_ADAPTER_IF_STA, MDNS_IP_PROTOCOL_V6);
|
|
break;
|
|
case SYSTEM_EVENT_AP_START:
|
|
_mdns_enable_pcb(TCPIP_ADAPTER_IF_AP, MDNS_IP_PROTOCOL_V4);
|
|
break;
|
|
case SYSTEM_EVENT_AP_STOP:
|
|
_mdns_disable_pcb(TCPIP_ADAPTER_IF_AP, MDNS_IP_PROTOCOL_V4);
|
|
_mdns_disable_pcb(TCPIP_ADAPTER_IF_AP, MDNS_IP_PROTOCOL_V6);
|
|
break;
|
|
case SYSTEM_EVENT_GOT_IP6:
|
|
_mdns_enable_pcb(interface, MDNS_IP_PROTOCOL_V6);
|
|
_mdns_announce_pcb(interface, MDNS_IP_PROTOCOL_V4, NULL, 0, true);
|
|
break;
|
|
case SYSTEM_EVENT_ETH_CONNECTED:
|
|
if (!tcpip_adapter_dhcpc_get_status(TCPIP_ADAPTER_IF_ETH, &dcst)) {
|
|
if (dcst != TCPIP_ADAPTER_DHCP_STARTED) {
|
|
_mdns_enable_pcb(TCPIP_ADAPTER_IF_ETH, MDNS_IP_PROTOCOL_V4);
|
|
}
|
|
}
|
|
break;
|
|
case SYSTEM_EVENT_ETH_GOT_IP:
|
|
_mdns_enable_pcb(TCPIP_ADAPTER_IF_ETH, MDNS_IP_PROTOCOL_V4);
|
|
break;
|
|
case SYSTEM_EVENT_ETH_DISCONNECTED:
|
|
_mdns_disable_pcb(TCPIP_ADAPTER_IF_ETH, MDNS_IP_PROTOCOL_V4);
|
|
_mdns_disable_pcb(TCPIP_ADAPTER_IF_ETH, MDNS_IP_PROTOCOL_V6);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* MDNS Search
|
|
* */
|
|
|
|
/**
|
|
* @brief Free search structure (except the results)
|
|
*/
|
|
static void _mdns_search_free(mdns_search_once_t * search)
|
|
{
|
|
free(search->instance);
|
|
free(search->service);
|
|
free(search->proto);
|
|
vSemaphoreDelete(search->lock);
|
|
free(search);
|
|
}
|
|
|
|
/**
|
|
* @brief Allocate new search structure
|
|
*/
|
|
static mdns_search_once_t * _mdns_search_init(const char * name, const char * service, const char * proto, uint16_t type, uint32_t timeout, uint8_t max_results)
|
|
{
|
|
mdns_search_once_t * search = (mdns_search_once_t *)malloc(sizeof(mdns_search_once_t));
|
|
if (!search) {
|
|
return NULL;
|
|
}
|
|
memset(search, 0, sizeof(mdns_search_once_t));
|
|
|
|
search->lock = xSemaphoreCreateMutex();
|
|
if (!search->lock) {
|
|
free(search);
|
|
return NULL;
|
|
}
|
|
|
|
if (!_str_null_or_empty(name)) {
|
|
search->instance = strndup(name, MDNS_NAME_BUF_LEN-1);
|
|
if (!search->instance) {
|
|
_mdns_search_free(search);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if (!_str_null_or_empty(service)) {
|
|
search->service = strndup(service, MDNS_NAME_BUF_LEN-1);
|
|
if (!search->service) {
|
|
_mdns_search_free(search);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if (!_str_null_or_empty(proto)) {
|
|
search->proto = strndup(proto, MDNS_NAME_BUF_LEN-1);
|
|
if (!search->proto) {
|
|
_mdns_search_free(search);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
search->type = type;
|
|
search->timeout = timeout;
|
|
search->num_results = 0;
|
|
search->max_results = max_results;
|
|
search->result = NULL;
|
|
search->state = SEARCH_INIT;
|
|
search->sent_at = 0;
|
|
search->started_at = xTaskGetTickCount() * portTICK_PERIOD_MS;
|
|
search->next = NULL;
|
|
|
|
xSemaphoreTake(search->lock, 0);
|
|
|
|
return search;
|
|
}
|
|
|
|
/**
|
|
* @brief Mark search as finished and remove it from search chain
|
|
*/
|
|
static void _mdns_search_finish(mdns_search_once_t * search)
|
|
{
|
|
search->state = SEARCH_OFF;
|
|
queueDetach(mdns_search_once_t, _mdns_server->search_once, search);
|
|
xSemaphoreGive(search->lock);
|
|
}
|
|
|
|
/**
|
|
* @brief Add new search to the search chain
|
|
*/
|
|
static void _mdns_search_add(mdns_search_once_t * search)
|
|
{
|
|
search->next = _mdns_server->search_once;
|
|
_mdns_server->search_once = search;
|
|
}
|
|
|
|
/**
|
|
* @brief Called from parser to finish any searches that have reached maximum results
|
|
*/
|
|
static void _mdns_search_finish_done()
|
|
{
|
|
mdns_search_once_t * search = _mdns_server->search_once;
|
|
mdns_search_once_t * s = NULL;
|
|
while (search) {
|
|
s = search;
|
|
search = search->next;
|
|
if (s->max_results && s->num_results >= s->max_results) {
|
|
_mdns_search_finish(s);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Create linked IP (copy) from parsed one
|
|
*/
|
|
static mdns_ip_addr_t * _mdns_result_addr_create_ip(ip_addr_t * ip)
|
|
{
|
|
mdns_ip_addr_t * a = (mdns_ip_addr_t *)malloc(sizeof(mdns_ip_addr_t));
|
|
if (!a) {
|
|
return NULL;
|
|
}
|
|
memset(a, 0 , sizeof(mdns_ip_addr_t));
|
|
a->addr.type = ip->type;
|
|
if (ip->type == IPADDR_TYPE_V6) {
|
|
memcpy(a->addr.u_addr.ip6.addr, ip->u_addr.ip6.addr, 16);
|
|
} else {
|
|
a->addr.u_addr.ip4.addr = ip->u_addr.ip4.addr;
|
|
}
|
|
return a;
|
|
}
|
|
|
|
/**
|
|
* @brief Chain new IP to search result
|
|
*/
|
|
static void _mdns_result_add_ip(mdns_result_t * r, ip_addr_t * ip)
|
|
{
|
|
mdns_ip_addr_t * a = r->addr;
|
|
while (a) {
|
|
if (a->addr.type == ip->type) {
|
|
if (a->addr.type == IPADDR_TYPE_V4 && a->addr.u_addr.ip4.addr == ip->u_addr.ip4.addr) {
|
|
return;
|
|
}
|
|
if (a->addr.type == IPADDR_TYPE_V6 && !memcmp(a->addr.u_addr.ip6.addr, ip->u_addr.ip6.addr, 16)) {
|
|
return;
|
|
}
|
|
}
|
|
a = a->next;
|
|
}
|
|
a = _mdns_result_addr_create_ip(ip);
|
|
if (!a) {
|
|
return;
|
|
}
|
|
a->next = r->addr;
|
|
r->addr = a;
|
|
}
|
|
|
|
/**
|
|
* @brief Called from parser to add A/AAAA data to search result
|
|
*/
|
|
static void _mdns_search_result_add_ip(mdns_search_once_t * search, const char * hostname, ip_addr_t * ip, tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
mdns_result_t * r = NULL;
|
|
mdns_ip_addr_t * a = NULL;
|
|
|
|
if ((search->type == MDNS_TYPE_A && ip->type == IPADDR_TYPE_V4)
|
|
|| (search->type == MDNS_TYPE_AAAA && ip->type == IPADDR_TYPE_V6)
|
|
|| search->type == MDNS_TYPE_ANY) {
|
|
r = search->result;
|
|
while (r) {
|
|
if (r->tcpip_if == tcpip_if && r->ip_protocol == ip_protocol) {
|
|
_mdns_result_add_ip(r, ip);
|
|
return;
|
|
}
|
|
r = r->next;
|
|
}
|
|
if (!search->max_results || search->num_results < search->max_results) {
|
|
r = (mdns_result_t *)malloc(sizeof(mdns_result_t));
|
|
if (!r) {
|
|
return;
|
|
}
|
|
|
|
memset(r, 0 , sizeof(mdns_result_t));
|
|
|
|
a = _mdns_result_addr_create_ip(ip);
|
|
if (!a) {
|
|
free(r);
|
|
return;
|
|
}
|
|
a->next = r->addr;
|
|
r->addr = a;
|
|
r->tcpip_if = tcpip_if;
|
|
r->ip_protocol = ip_protocol;
|
|
r->next = search->result;
|
|
search->result = r;
|
|
search->num_results++;
|
|
}
|
|
} else if (search->type == MDNS_TYPE_PTR) {
|
|
r = search->result;
|
|
while (r) {
|
|
if (r->tcpip_if == tcpip_if && r->ip_protocol == ip_protocol && !_str_null_or_empty(r->hostname) && !strcasecmp(hostname, r->hostname)) {
|
|
_mdns_result_add_ip(r, ip);
|
|
break;
|
|
}
|
|
r = r->next;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Called from parser to add PTR data to search result
|
|
*/
|
|
static mdns_result_t * _mdns_search_result_add_ptr(mdns_search_once_t * search, const char * instance, tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
mdns_result_t * r = search->result;
|
|
while (r) {
|
|
if (r->tcpip_if == tcpip_if && r->ip_protocol == ip_protocol && !_str_null_or_empty(r->instance_name) && !strcasecmp(instance, r->instance_name)) {
|
|
return r;
|
|
}
|
|
r = r->next;
|
|
}
|
|
if (!search->max_results || search->num_results < search->max_results) {
|
|
r = (mdns_result_t *)malloc(sizeof(mdns_result_t));
|
|
if (!r) {
|
|
return NULL;
|
|
}
|
|
|
|
memset(r, 0 , sizeof(mdns_result_t));
|
|
r->instance_name = strdup(instance);
|
|
if (!r->instance_name) {
|
|
free(r);
|
|
return NULL;
|
|
}
|
|
|
|
r->tcpip_if = tcpip_if;
|
|
r->ip_protocol = ip_protocol;
|
|
r->next = search->result;
|
|
search->result = r;
|
|
search->num_results++;
|
|
return r;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* @brief Called from parser to add SRV data to search result
|
|
*/
|
|
static void _mdns_search_result_add_srv(mdns_search_once_t * search, const char * hostname, uint16_t port, tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
mdns_result_t * r = search->result;
|
|
while (r) {
|
|
if (r->tcpip_if == tcpip_if && r->ip_protocol == ip_protocol && !_str_null_or_empty(r->hostname) && !strcasecmp(hostname, r->hostname)) {
|
|
return;
|
|
}
|
|
r = r->next;
|
|
}
|
|
if (!search->max_results || search->num_results < search->max_results) {
|
|
r = (mdns_result_t *)malloc(sizeof(mdns_result_t));
|
|
if (!r) {
|
|
return;
|
|
}
|
|
|
|
memset(r, 0 , sizeof(mdns_result_t));
|
|
r->hostname = strdup(hostname);
|
|
if (!r->hostname) {
|
|
free(r);
|
|
return;
|
|
}
|
|
r->port = port;
|
|
r->tcpip_if = tcpip_if;
|
|
r->ip_protocol = ip_protocol;
|
|
r->next = search->result;
|
|
search->result = r;
|
|
search->num_results++;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Called from parser to add TXT data to search result
|
|
*/
|
|
static void _mdns_search_result_add_txt(mdns_search_once_t * search, mdns_txt_item_t * txt, size_t txt_count, tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
int i;
|
|
mdns_result_t * r = search->result;
|
|
while (r) {
|
|
if (r->tcpip_if == tcpip_if && r->ip_protocol == ip_protocol) {
|
|
if (r->txt) {
|
|
return;
|
|
}
|
|
r->txt = txt;
|
|
r->txt_count = txt_count;
|
|
return;
|
|
}
|
|
r = r->next;
|
|
}
|
|
if (!search->max_results || search->num_results < search->max_results) {
|
|
r = (mdns_result_t *)malloc(sizeof(mdns_result_t));
|
|
if (!r) {
|
|
for (i=0; i<txt_count; i++) {
|
|
free((char *)(txt[i].key));
|
|
free((char *)(txt[i].value));
|
|
}
|
|
free(txt);
|
|
return;
|
|
}
|
|
|
|
memset(r, 0 , sizeof(mdns_result_t));
|
|
r->txt = txt;
|
|
r->txt_count = txt_count;
|
|
r->tcpip_if = tcpip_if;
|
|
r->ip_protocol = ip_protocol;
|
|
r->next = search->result;
|
|
search->result = r;
|
|
search->num_results++;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Called from packet parser to find matching running search
|
|
*/
|
|
static mdns_search_once_t * _mdns_search_find_from(mdns_search_once_t * s, mdns_name_t * name, uint16_t type, tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
mdns_result_t * r = NULL;
|
|
while (s) {
|
|
if (s->state == SEARCH_OFF) {
|
|
s = s->next;
|
|
continue;
|
|
}
|
|
|
|
if (type == MDNS_TYPE_A || type == MDNS_TYPE_AAAA) {
|
|
if ((s->type == MDNS_TYPE_ANY && s->service != NULL)
|
|
|| (s->type != MDNS_TYPE_ANY && s->type != type && s->type != MDNS_TYPE_PTR))
|
|
{
|
|
s = s->next;
|
|
continue;
|
|
}
|
|
if (s->type != MDNS_TYPE_PTR) {
|
|
if (!strcasecmp(name->host, s->instance)) {
|
|
return s;
|
|
}
|
|
s = s->next;
|
|
continue;
|
|
}
|
|
r = s->result;
|
|
while (r) {
|
|
if (r->tcpip_if == tcpip_if && r->ip_protocol == ip_protocol && !_str_null_or_empty(r->hostname) && !strcasecmp(name->host, r->hostname)) {
|
|
return s;
|
|
}
|
|
r = r->next;
|
|
}
|
|
s = s->next;
|
|
continue;
|
|
}
|
|
|
|
if (type == MDNS_TYPE_SRV || type == MDNS_TYPE_TXT) {
|
|
if ((s->type == MDNS_TYPE_ANY && s->service == NULL)
|
|
|| (s->type != MDNS_TYPE_ANY && s->type != type && s->type != MDNS_TYPE_PTR))
|
|
{
|
|
s = s->next;
|
|
continue;
|
|
}
|
|
if (strcasecmp(name->service, s->service)
|
|
|| strcasecmp(name->proto, s->proto))
|
|
{
|
|
s = s->next;
|
|
continue;
|
|
}
|
|
if (s->type != MDNS_TYPE_PTR) {
|
|
if (!strcasecmp(name->host, s->instance)) {
|
|
return s;
|
|
}
|
|
s = s->next;
|
|
continue;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
if (type == MDNS_TYPE_PTR && type == s->type && !strcasecmp(name->service, s->service) && !strcasecmp(name->proto, s->proto)) {
|
|
return s;
|
|
}
|
|
|
|
s = s->next;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* @brief Create search packet for partidular interface
|
|
*/
|
|
static mdns_tx_packet_t * _mdns_create_search_packet(mdns_search_once_t * search, tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
mdns_result_t * r = NULL;
|
|
mdns_tx_packet_t * packet = _mdns_alloc_packet_default(tcpip_if, ip_protocol);
|
|
if (!packet) {
|
|
return NULL;
|
|
}
|
|
|
|
mdns_out_question_t * q = (mdns_out_question_t *)malloc(sizeof(mdns_out_question_t));
|
|
if (!q) {
|
|
_mdns_free_tx_packet(packet);
|
|
return NULL;
|
|
}
|
|
q->next = NULL;
|
|
q->unicast = search->type != MDNS_TYPE_PTR;
|
|
q->type = search->type;
|
|
q->host = search->instance;
|
|
q->service = search->service;
|
|
q->proto = search->proto;
|
|
q->domain = MDNS_DEFAULT_DOMAIN;
|
|
queueToEnd(mdns_out_question_t, packet->questions, q);
|
|
|
|
if (search->type == MDNS_TYPE_PTR) {
|
|
r = search->result;
|
|
while (r) {
|
|
//full record on the same interface is available
|
|
if (r->tcpip_if != tcpip_if || r->ip_protocol != ip_protocol || r->instance_name == NULL || r->hostname == NULL || r->addr == NULL) {
|
|
r = r->next;
|
|
continue;
|
|
}
|
|
mdns_out_answer_t * a = (mdns_out_answer_t *)malloc(sizeof(mdns_out_answer_t));
|
|
if (!a) {
|
|
_mdns_free_tx_packet(packet);
|
|
return NULL;
|
|
}
|
|
a->type = MDNS_TYPE_PTR;
|
|
a->service = NULL;
|
|
a->custom_instance = r->instance_name;
|
|
a->custom_service = search->service;
|
|
a->custom_proto = search->proto;
|
|
a->bye = false;
|
|
a->flush = false;
|
|
a->next = NULL;
|
|
queueToEnd(mdns_out_answer_t, packet->answers, a);
|
|
r = r->next;
|
|
}
|
|
}
|
|
|
|
return packet;
|
|
}
|
|
|
|
/**
|
|
* @brief Send search packet to particular interface
|
|
*/
|
|
static void _mdns_search_send_pcb(mdns_search_once_t * search, tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
|
|
{
|
|
mdns_tx_packet_t * packet = NULL;
|
|
if (_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].pcb && _mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].state == PCB_RUNNING) {
|
|
packet = _mdns_create_search_packet(search, tcpip_if, ip_protocol);
|
|
if (!packet) {
|
|
return;
|
|
}
|
|
_mdns_dispatch_tx_packet(packet);
|
|
_mdns_free_tx_packet(packet);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Send search packet to all available interfaces
|
|
*/
|
|
static void _mdns_search_send(mdns_search_once_t * search)
|
|
{
|
|
uint8_t i, j;
|
|
for (i=0; i<TCPIP_ADAPTER_IF_MAX; i++) {
|
|
for (j=0; j<MDNS_IP_PROTOCOL_MAX; j++) {
|
|
_mdns_search_send_pcb(search, (tcpip_adapter_if_t)i, (mdns_ip_protocol_t)j);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void _mdns_tx_handle_packet(mdns_tx_packet_t * p)
|
|
{
|
|
mdns_tx_packet_t * a = NULL;
|
|
mdns_out_question_t * q = NULL;
|
|
mdns_pcb_t * pcb = &_mdns_server->interfaces[p->tcpip_if].pcbs[p->ip_protocol];
|
|
uint32_t send_after = 1000;
|
|
|
|
if (pcb->state == PCB_OFF) {
|
|
_mdns_free_tx_packet(p);
|
|
return;
|
|
}
|
|
_mdns_dispatch_tx_packet(p);
|
|
|
|
switch(pcb->state) {
|
|
case PCB_PROBE_1:
|
|
q = p->questions;
|
|
while (q) {
|
|
q->unicast = false;
|
|
q = q->next;
|
|
}
|
|
//fallthrough
|
|
case PCB_PROBE_2:
|
|
_mdns_schedule_tx_packet(p, 250);
|
|
pcb->state = (mdns_pcb_state_t)((uint8_t)(pcb->state) + 1);
|
|
break;
|
|
case PCB_PROBE_3:
|
|
a = _mdns_create_announce_from_probe(p);
|
|
if (!a) {
|
|
_mdns_schedule_tx_packet(p, 250);
|
|
break;
|
|
}
|
|
pcb->probe_running = false;
|
|
pcb->probe_ip = false;
|
|
pcb->probe_services_len = 0;
|
|
pcb->failed_probes = 0;
|
|
free(pcb->probe_services);
|
|
pcb->probe_services = NULL;
|
|
_mdns_free_tx_packet(p);
|
|
p = a;
|
|
send_after = 250;
|
|
//fallthrough
|
|
case PCB_ANNOUNCE_1:
|
|
//fallthrough
|
|
case PCB_ANNOUNCE_2:
|
|
_mdns_schedule_tx_packet(p, send_after);
|
|
pcb->state = (mdns_pcb_state_t)((uint8_t)(pcb->state) + 1);
|
|
break;
|
|
case PCB_ANNOUNCE_3:
|
|
pcb->state = PCB_RUNNING;
|
|
_mdns_free_tx_packet(p);
|
|
break;
|
|
default:
|
|
_mdns_free_tx_packet(p);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Free action data
|
|
*/
|
|
static void _mdns_free_action(mdns_action_t * action)
|
|
{
|
|
switch(action->type) {
|
|
case ACTION_HOSTNAME_SET:
|
|
free(action->data.hostname);
|
|
break;
|
|
case ACTION_INSTANCE_SET:
|
|
free(action->data.instance);
|
|
break;
|
|
case ACTION_SERVICE_ADD:
|
|
_mdns_free_service(action->data.srv_add.service->service);
|
|
free(action->data.srv_add.service);
|
|
break;
|
|
case ACTION_SERVICE_INSTANCE_SET:
|
|
free(action->data.srv_instance.instance);
|
|
break;
|
|
case ACTION_SERVICE_TXT_REPLACE:
|
|
free(action->data.srv_txt_replace.txt);
|
|
break;
|
|
case ACTION_SERVICE_TXT_SET:
|
|
free(action->data.srv_txt_set.key);
|
|
free(action->data.srv_txt_set.value);
|
|
break;
|
|
case ACTION_SERVICE_TXT_DEL:
|
|
free(action->data.srv_txt_del.key);
|
|
break;
|
|
case ACTION_SEARCH_ADD:
|
|
//fallthrough
|
|
case ACTION_SEARCH_SEND:
|
|
//fallthrough
|
|
case ACTION_SEARCH_END:
|
|
_mdns_search_free(action->data.search_add.search);
|
|
break;
|
|
case ACTION_TX_HANDLE:
|
|
_mdns_free_tx_packet(action->data.tx_handle.packet);
|
|
break;
|
|
case ACTION_RX_HANDLE:
|
|
pbuf_free(action->data.rx_handle.packet->pb);
|
|
free(action->data.rx_handle.packet);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
free(action);
|
|
}
|
|
|
|
/**
|
|
* @brief Called from service thread to execute given action
|
|
*/
|
|
static void _mdns_execute_action(mdns_action_t * action)
|
|
{
|
|
mdns_srv_item_t * a = NULL;
|
|
mdns_service_t * service;
|
|
char * key;
|
|
char * value;
|
|
mdns_txt_linked_item_t * txt, * t;
|
|
|
|
switch(action->type) {
|
|
case ACTION_SYSTEM_EVENT:
|
|
_mdns_handle_system_event(action->data.sys_event.event_id, action->data.sys_event.interface);
|
|
break;
|
|
case ACTION_HOSTNAME_SET:
|
|
_mdns_send_final_bye(true);
|
|
free((char*)_mdns_server->hostname);
|
|
_mdns_server->hostname = action->data.hostname;
|
|
_mdns_restart_all_pcbs();
|
|
|
|
break;
|
|
case ACTION_INSTANCE_SET:
|
|
_mdns_send_bye_all_pcbs_no_instance();
|
|
free((char*)_mdns_server->instance);
|
|
_mdns_server->instance = action->data.instance;
|
|
_mdns_restart_all_pcbs_no_instance();
|
|
|
|
break;
|
|
case ACTION_SERVICE_ADD:
|
|
action->data.srv_add.service->next = _mdns_server->services;
|
|
_mdns_server->services = action->data.srv_add.service;
|
|
_mdns_probe_all_pcbs(&action->data.srv_add.service, 1, false, false);
|
|
|
|
break;
|
|
case ACTION_SERVICE_INSTANCE_SET:
|
|
if (action->data.srv_instance.service->service->instance) {
|
|
_mdns_send_bye(&action->data.srv_instance.service, 1, false);
|
|
free((char*)action->data.srv_instance.service->service->instance);
|
|
}
|
|
action->data.srv_instance.service->service->instance = action->data.srv_instance.instance;
|
|
_mdns_probe_all_pcbs(&action->data.srv_instance.service, 1, false, false);
|
|
|
|
break;
|
|
case ACTION_SERVICE_PORT_SET:
|
|
action->data.srv_port.service->service->port = action->data.srv_port.port;
|
|
_mdns_announce_all_pcbs(&action->data.srv_port.service, 1, true);
|
|
|
|
break;
|
|
case ACTION_SERVICE_TXT_REPLACE:
|
|
service = action->data.srv_txt_replace.service->service;
|
|
txt = service->txt;
|
|
service->txt = NULL;
|
|
while (txt) {
|
|
t = txt;
|
|
txt = txt->next;
|
|
free((char *)t->value);
|
|
free((char *)t->key);
|
|
free(t);
|
|
}
|
|
service->txt = _mdns_allocate_txt(action->data.srv_txt_replace.num_items, action->data.srv_txt_replace.txt);
|
|
_mdns_announce_all_pcbs(&action->data.srv_txt_replace.service, 1, false);
|
|
|
|
break;
|
|
case ACTION_SERVICE_TXT_SET:
|
|
service = action->data.srv_txt_set.service->service;
|
|
key = action->data.srv_txt_set.key;
|
|
value = action->data.srv_txt_set.value;
|
|
txt = service->txt;
|
|
while (txt) {
|
|
if (strcmp(txt->key, key) == 0) {
|
|
free((char *)txt->value);
|
|
free(key);
|
|
txt->value = value;
|
|
break;
|
|
}
|
|
txt = txt->next;
|
|
}
|
|
if (!txt) {
|
|
txt = (mdns_txt_linked_item_t *)malloc(sizeof(mdns_txt_linked_item_t));
|
|
if (!txt) {
|
|
_mdns_free_action(action);
|
|
return;
|
|
}
|
|
txt->key = key;
|
|
txt->value = value;
|
|
txt->next = service->txt;
|
|
service->txt = txt;
|
|
}
|
|
|
|
_mdns_announce_all_pcbs(&action->data.srv_txt_set.service, 1, false);
|
|
|
|
break;
|
|
case ACTION_SERVICE_TXT_DEL:
|
|
service = action->data.srv_txt_del.service->service;
|
|
key = action->data.srv_txt_del.key;
|
|
txt = service->txt;
|
|
if (!txt) {
|
|
break;
|
|
}
|
|
if (strcmp(txt->key, key) == 0) {
|
|
service->txt = txt->next;
|
|
free((char *)txt->key);
|
|
free((char *)txt->value);
|
|
free(txt);
|
|
} else {
|
|
while (txt->next) {
|
|
if (strcmp(txt->next->key, key) == 0) {
|
|
t = txt->next;
|
|
txt->next = t->next;
|
|
free((char *)t->key);
|
|
free((char *)t->value);
|
|
free(t);
|
|
break;
|
|
} else {
|
|
txt = txt->next;
|
|
}
|
|
}
|
|
}
|
|
free(key);
|
|
|
|
_mdns_announce_all_pcbs(&action->data.srv_txt_set.service, 1, false);
|
|
|
|
break;
|
|
case ACTION_SERVICE_DEL:
|
|
a = _mdns_server->services;
|
|
if (_mdns_server->services == action->data.srv_del.service) {
|
|
_mdns_server->services = a->next;
|
|
_mdns_send_bye(&a, 1, false);
|
|
_mdns_free_service(a->service);
|
|
free(a);
|
|
} else {
|
|
while (a->next && a->next != action->data.srv_del.service) {
|
|
a = a->next;
|
|
}
|
|
if (a->next == action->data.srv_del.service) {
|
|
mdns_srv_item_t * b = a->next;
|
|
a->next = a->next->next;
|
|
_mdns_send_bye(&b, 1, false);
|
|
_mdns_free_service(b->service);
|
|
free(b);
|
|
}
|
|
}
|
|
|
|
break;
|
|
case ACTION_SERVICES_CLEAR:
|
|
_mdns_send_final_bye(false);
|
|
a = _mdns_server->services;
|
|
_mdns_server->services = NULL;
|
|
while (a) {
|
|
mdns_srv_item_t * s = a;
|
|
a = a->next;
|
|
_mdns_free_service(s->service);
|
|
free(s);
|
|
}
|
|
|
|
break;
|
|
case ACTION_SEARCH_ADD:
|
|
_mdns_search_add(action->data.search_add.search);
|
|
break;
|
|
case ACTION_SEARCH_SEND:
|
|
_mdns_search_send(action->data.search_add.search);
|
|
break;
|
|
case ACTION_SEARCH_END:
|
|
_mdns_search_finish(action->data.search_add.search);
|
|
break;
|
|
case ACTION_TX_HANDLE:
|
|
_mdns_tx_handle_packet(action->data.tx_handle.packet);
|
|
break;
|
|
case ACTION_RX_HANDLE:
|
|
mdns_parse_packet(action->data.rx_handle.packet);
|
|
pbuf_free(action->data.rx_handle.packet->pb);
|
|
free(action->data.rx_handle.packet);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
free(action);
|
|
}
|
|
|
|
/**
|
|
* @brief Queue search action
|
|
*/
|
|
static esp_err_t _mdns_send_search_action(mdns_action_type_t type, mdns_search_once_t * search)
|
|
{
|
|
mdns_action_t * action = NULL;
|
|
|
|
action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (!action) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
|
|
action->type = type;
|
|
action->data.search_add.search = search;
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
/**
|
|
* @brief Called from timer task to run mDNS responder
|
|
*/
|
|
static void _mdns_scheduler_run()
|
|
{
|
|
mdns_tx_packet_t * p = _mdns_server->tx_queue_head;
|
|
mdns_action_t * action = NULL;
|
|
|
|
if (!p) {
|
|
return;
|
|
}
|
|
MDNS_SERVICE_LOCK();
|
|
if ((int32_t)(p->send_at - (xTaskGetTickCount() * portTICK_PERIOD_MS)) < 0) {
|
|
action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (action) {
|
|
_mdns_server->tx_queue_head = p->next;
|
|
action->type = ACTION_TX_HANDLE;
|
|
action->data.tx_handle.packet = p;
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
free(action);
|
|
_mdns_server->tx_queue_head = p;
|
|
}
|
|
}
|
|
}
|
|
MDNS_SERVICE_UNLOCK();
|
|
}
|
|
|
|
/**
|
|
* @brief Called from timer task to run active searches
|
|
*/
|
|
static void _mdns_search_run()
|
|
{
|
|
mdns_search_once_t * s = _mdns_server->search_once;
|
|
uint32_t now = xTaskGetTickCount() * portTICK_PERIOD_MS;
|
|
if (!s) {
|
|
return;
|
|
}
|
|
MDNS_SERVICE_LOCK();
|
|
while (s) {
|
|
if (s->state != SEARCH_OFF) {
|
|
if (now > (s->started_at + s->timeout)) {
|
|
s->state = SEARCH_OFF;
|
|
if (_mdns_send_search_action(ACTION_SEARCH_END, s) != ESP_OK) {
|
|
s->state = SEARCH_RUNNING;
|
|
}
|
|
} else if (s->state == SEARCH_INIT || (now - s->sent_at) > 1000) {
|
|
s->state = SEARCH_RUNNING;
|
|
s->sent_at = now;
|
|
if (_mdns_send_search_action(ACTION_SEARCH_SEND, s) != ESP_OK) {
|
|
s->sent_at -= 1000;
|
|
}
|
|
}
|
|
}
|
|
s = s->next;
|
|
}
|
|
MDNS_SERVICE_UNLOCK();
|
|
}
|
|
|
|
/**
|
|
* @brief the main MDNS service task. Packets are received and parsed here
|
|
*/
|
|
static void _mdns_service_task(void *pvParameters)
|
|
{
|
|
mdns_action_t * a = NULL;
|
|
for (;;) {
|
|
if (_mdns_server && _mdns_server->action_queue) {
|
|
if (xQueueReceive(_mdns_server->action_queue, &a, portMAX_DELAY) == pdTRUE) {
|
|
if (a->type == ACTION_TASK_STOP) {
|
|
break;
|
|
}
|
|
MDNS_SERVICE_LOCK();
|
|
_mdns_execute_action(a);
|
|
MDNS_SERVICE_UNLOCK();
|
|
}
|
|
} else {
|
|
vTaskDelay(500 * portTICK_PERIOD_MS);
|
|
}
|
|
}
|
|
_mdns_service_task_handle = NULL;
|
|
vTaskDelete(NULL);
|
|
}
|
|
|
|
static void _mdns_timer_cb(void * arg)
|
|
{
|
|
_mdns_scheduler_run();
|
|
_mdns_search_run();
|
|
}
|
|
|
|
static esp_err_t _mdns_start_timer(){
|
|
esp_timer_create_args_t timer_conf = {
|
|
.callback = _mdns_timer_cb,
|
|
.arg = NULL,
|
|
.dispatch_method = ESP_TIMER_TASK,
|
|
.name = "mdns_timer"
|
|
};
|
|
esp_err_t err = esp_timer_create(&timer_conf, &(_mdns_server->timer_handle));
|
|
if (err) {
|
|
return err;
|
|
}
|
|
return esp_timer_start_periodic(_mdns_server->timer_handle, MDNS_TIMER_PERIOD_US);
|
|
}
|
|
|
|
static esp_err_t _mdns_stop_timer(){
|
|
esp_err_t err = ESP_OK;
|
|
if (_mdns_server->timer_handle) {
|
|
err = esp_timer_stop(_mdns_server->timer_handle);
|
|
if (err) {
|
|
return err;
|
|
}
|
|
err = esp_timer_delete(_mdns_server->timer_handle);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* @brief Start the service thread if not running
|
|
*
|
|
* @return
|
|
* - ESP_OK on success
|
|
* - ESP_FAIL on error
|
|
*/
|
|
static esp_err_t _mdns_service_task_start()
|
|
{
|
|
if (!_mdns_service_semaphore) {
|
|
_mdns_service_semaphore = xSemaphoreCreateMutex();
|
|
if (!_mdns_service_semaphore) {
|
|
return ESP_FAIL;
|
|
}
|
|
}
|
|
MDNS_SERVICE_LOCK();
|
|
if (_mdns_start_timer()) {
|
|
MDNS_SERVICE_UNLOCK();
|
|
return ESP_FAIL;
|
|
}
|
|
if (!_mdns_service_task_handle) {
|
|
xTaskCreatePinnedToCore(_mdns_service_task, "mdns", MDNS_SERVICE_STACK_DEPTH, NULL, 1, (TaskHandle_t * const)(&_mdns_service_task_handle), 0);
|
|
if (!_mdns_service_task_handle) {
|
|
MDNS_SERVICE_UNLOCK();
|
|
return ESP_FAIL;
|
|
}
|
|
}
|
|
MDNS_SERVICE_UNLOCK();
|
|
return ESP_OK;
|
|
}
|
|
|
|
/**
|
|
* @brief Stop the service thread
|
|
*
|
|
* @return
|
|
* - ESP_OK
|
|
*/
|
|
static esp_err_t _mdns_service_task_stop()
|
|
{
|
|
MDNS_SERVICE_LOCK();
|
|
_mdns_stop_timer();
|
|
if (_mdns_service_task_handle) {
|
|
mdns_action_t action;
|
|
mdns_action_t * a = &action;
|
|
action.type = ACTION_TASK_STOP;
|
|
if (xQueueSend(_mdns_server->action_queue, &a, (portTickType)0) != pdPASS) {
|
|
vTaskDelete(_mdns_service_task_handle);
|
|
_mdns_service_task_handle = NULL;
|
|
}
|
|
while (_mdns_service_task_handle) {
|
|
vTaskDelay(10 / portTICK_PERIOD_MS);
|
|
}
|
|
}
|
|
MDNS_SERVICE_UNLOCK();
|
|
return ESP_OK;
|
|
}
|
|
|
|
/*
|
|
* Public Methods
|
|
* */
|
|
|
|
esp_err_t mdns_handle_system_event(void *ctx, system_event_t *event)
|
|
{
|
|
if (!_mdns_server) {
|
|
return ESP_OK;
|
|
}
|
|
|
|
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (!action) {
|
|
return ESP_OK;
|
|
}
|
|
action->type = ACTION_SYSTEM_EVENT;
|
|
action->data.sys_event.event_id = event->event_id;
|
|
action->data.sys_event.interface = (event->event_id == SYSTEM_EVENT_GOT_IP6)?event->event_info.got_ip6.if_index:0;
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
free(action);
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
esp_err_t mdns_init()
|
|
{
|
|
esp_err_t err = ESP_OK;
|
|
|
|
if (_mdns_server) {
|
|
return err;
|
|
}
|
|
|
|
_mdns_server = (mdns_server_t *)malloc(sizeof(mdns_server_t));
|
|
if (!_mdns_server) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
memset((uint8_t*)_mdns_server, 0, sizeof(mdns_server_t));
|
|
|
|
_mdns_server->lock = xSemaphoreCreateMutex();
|
|
if (!_mdns_server->lock) {
|
|
err = ESP_ERR_NO_MEM;
|
|
goto free_server;
|
|
}
|
|
|
|
_mdns_server->action_queue = xQueueCreate(MDNS_ACTION_QUEUE_LEN, sizeof(mdns_action_t *));
|
|
if (!_mdns_server->action_queue) {
|
|
err = ESP_ERR_NO_MEM;
|
|
goto free_lock;
|
|
}
|
|
|
|
if (_mdns_service_task_start()) {
|
|
//service start failed!
|
|
err = ESP_FAIL;
|
|
goto free_all;
|
|
}
|
|
|
|
uint8_t i;
|
|
ip6_addr_t tmp_addr6;
|
|
tcpip_adapter_ip_info_t if_ip_info;
|
|
|
|
for (i=0; i<TCPIP_ADAPTER_IF_MAX; i++) {
|
|
if (!tcpip_adapter_get_ip6_linklocal(i, &tmp_addr6) && !_ipv6_address_is_zero(tmp_addr6)) {
|
|
_mdns_enable_pcb(i, MDNS_IP_PROTOCOL_V6);
|
|
}
|
|
if (!tcpip_adapter_get_ip_info(i, &if_ip_info) && if_ip_info.ip.addr) {
|
|
_mdns_enable_pcb(i, MDNS_IP_PROTOCOL_V4);
|
|
}
|
|
}
|
|
|
|
return ESP_OK;
|
|
|
|
free_all:
|
|
vQueueDelete(_mdns_server->action_queue);
|
|
free_lock:
|
|
vSemaphoreDelete(_mdns_server->lock);
|
|
free_server:
|
|
free(_mdns_server);
|
|
_mdns_server = NULL;
|
|
return err;
|
|
}
|
|
|
|
void mdns_free()
|
|
{
|
|
uint8_t i, j;
|
|
if (!_mdns_server) {
|
|
return;
|
|
}
|
|
_mdns_service_task_stop();
|
|
mdns_service_remove_all(_mdns_server);
|
|
for (i=0; i<TCPIP_ADAPTER_IF_MAX; i++) {
|
|
for (j=0; j<MDNS_IP_PROTOCOL_MAX; j++) {
|
|
_mdns_pcb_deinit(i, j);
|
|
}
|
|
}
|
|
free((char*)_mdns_server->hostname);
|
|
free((char*)_mdns_server->instance);
|
|
if (_mdns_server->action_queue) {
|
|
mdns_action_t * c;
|
|
while (xQueueReceive(_mdns_server->action_queue, &c, 0) == pdTRUE) {
|
|
_mdns_free_action(c);
|
|
}
|
|
vQueueDelete(_mdns_server->action_queue);
|
|
}
|
|
_mdns_clear_tx_queue_head();
|
|
while (_mdns_server->search_once) {
|
|
mdns_search_once_t * h = _mdns_server->search_once;
|
|
_mdns_server->search_once = h->next;
|
|
free(h->instance);
|
|
free(h->service);
|
|
free(h->proto);
|
|
vSemaphoreDelete(h->lock);
|
|
if (h->result) {
|
|
mdns_query_results_free(h->result);
|
|
}
|
|
free(h);
|
|
}
|
|
vSemaphoreDelete(_mdns_server->lock);
|
|
free(_mdns_server);
|
|
_mdns_server = NULL;
|
|
}
|
|
|
|
esp_err_t mdns_hostname_set(const char * hostname)
|
|
{
|
|
if (!_mdns_server) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
if (_str_null_or_empty(hostname) || strlen(hostname) > (MDNS_NAME_BUF_LEN - 1)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
char * new_hostname = strndup(hostname, MDNS_NAME_BUF_LEN - 1);
|
|
if (!new_hostname) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
|
|
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (!action) {
|
|
free(new_hostname);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
action->type = ACTION_HOSTNAME_SET;
|
|
action->data.hostname = new_hostname;
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
free(new_hostname);
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ERR_OK;
|
|
}
|
|
|
|
esp_err_t mdns_instance_name_set(const char * instance)
|
|
{
|
|
if (!_mdns_server) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
if (_str_null_or_empty(instance) || strlen(instance) > (MDNS_NAME_BUF_LEN - 1)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
char * new_instance = strndup(instance, MDNS_NAME_BUF_LEN - 1);
|
|
if (!new_instance) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
|
|
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (!action) {
|
|
free(new_instance);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
action->type = ACTION_INSTANCE_SET;
|
|
action->data.instance = new_instance;
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
free(new_instance);
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ERR_OK;
|
|
}
|
|
|
|
/*
|
|
* MDNS SERVICES
|
|
* */
|
|
|
|
esp_err_t mdns_service_add(const char * instance, const char * service, const char * proto, uint16_t port, mdns_txt_item_t txt[], size_t num_items)
|
|
{
|
|
if (!_mdns_server || _str_null_or_empty(service) || _str_null_or_empty(proto) || !port) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
mdns_srv_item_t * item = _mdns_get_service_item(service, proto);
|
|
if (item) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
|
|
mdns_service_t * s = _mdns_create_service(service, proto, port, instance, num_items, txt);
|
|
if (!s) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
|
|
item = (mdns_srv_item_t *)malloc(sizeof(mdns_srv_item_t));
|
|
if (!item) {
|
|
_mdns_free_service(s);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
|
|
item->service = s;
|
|
item->next = NULL;
|
|
|
|
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (!action) {
|
|
_mdns_free_service(s);
|
|
free(item);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
action->type = ACTION_SERVICE_ADD;
|
|
action->data.srv_add.service = item;
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
_mdns_free_service(s);
|
|
free(item);
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
|
|
uint8_t i = 0;
|
|
while (_mdns_get_service_item(service, proto) == NULL && i++ < 200) {
|
|
vTaskDelay(1);
|
|
}
|
|
if (i >= 200) {
|
|
return ESP_FAIL;
|
|
}
|
|
|
|
return ESP_OK;
|
|
}
|
|
|
|
esp_err_t mdns_service_port_set(const char * service, const char * proto, uint16_t port)
|
|
{
|
|
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto) || !port) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
mdns_srv_item_t * s = _mdns_get_service_item(service, proto);
|
|
if (!s) {
|
|
return ESP_ERR_NOT_FOUND;
|
|
}
|
|
|
|
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (!action) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
action->type = ACTION_SERVICE_PORT_SET;
|
|
action->data.srv_port.service = s;
|
|
action->data.srv_port.port = port;
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
esp_err_t mdns_service_txt_set(const char * service, const char * proto, mdns_txt_item_t txt[], uint8_t num_items)
|
|
{
|
|
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto) || (num_items && txt == NULL)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
mdns_srv_item_t * s = _mdns_get_service_item(service, proto);
|
|
if (!s) {
|
|
return ESP_ERR_NOT_FOUND;
|
|
}
|
|
|
|
mdns_txt_item_t * txt_copy = NULL;
|
|
if (num_items){
|
|
txt_copy = (mdns_txt_item_t *)malloc(num_items * sizeof(mdns_txt_item_t));
|
|
if (!txt_copy) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
memcpy(txt_copy, txt, num_items * sizeof(mdns_txt_item_t));
|
|
}
|
|
|
|
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (!action) {
|
|
free(txt_copy);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
action->type = ACTION_SERVICE_TXT_REPLACE;
|
|
action->data.srv_txt_replace.service = s;
|
|
action->data.srv_txt_replace.num_items = num_items;
|
|
action->data.srv_txt_replace.txt = txt_copy;
|
|
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
free(txt_copy);
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
|
|
esp_err_t mdns_service_txt_item_set(const char * service, const char * proto, const char * key, const char * value)
|
|
{
|
|
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto) || _str_null_or_empty(key) || !value) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
mdns_srv_item_t * s = _mdns_get_service_item(service, proto);
|
|
if (!s) {
|
|
return ESP_ERR_NOT_FOUND;
|
|
}
|
|
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (!action) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
|
|
action->type = ACTION_SERVICE_TXT_SET;
|
|
action->data.srv_txt_set.service = s;
|
|
action->data.srv_txt_set.key = strdup(key);
|
|
if (!action->data.srv_txt_set.key) {
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
action->data.srv_txt_set.value = strdup(value);
|
|
if (!action->data.srv_txt_set.value) {
|
|
free(action->data.srv_txt_set.key);
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
free(action->data.srv_txt_set.key);
|
|
free(action->data.srv_txt_set.value);
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
esp_err_t mdns_service_txt_item_remove(const char * service, const char * proto, const char * key)
|
|
{
|
|
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto) || _str_null_or_empty(key)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
mdns_srv_item_t * s = _mdns_get_service_item(service, proto);
|
|
if (!s) {
|
|
return ESP_ERR_NOT_FOUND;
|
|
}
|
|
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (!action) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
|
|
action->type = ACTION_SERVICE_TXT_DEL;
|
|
action->data.srv_txt_del.service = s;
|
|
action->data.srv_txt_del.key = strdup(key);
|
|
if (!action->data.srv_txt_del.key) {
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
free(action->data.srv_txt_del.key);
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
esp_err_t mdns_service_instance_name_set(const char * service, const char * proto, const char * instance)
|
|
{
|
|
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
if (_str_null_or_empty(instance) || strlen(instance) > (MDNS_NAME_BUF_LEN - 1)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
mdns_srv_item_t * s = _mdns_get_service_item(service, proto);
|
|
if (!s) {
|
|
return ESP_ERR_NOT_FOUND;
|
|
}
|
|
char * new_instance = strndup(instance, MDNS_NAME_BUF_LEN - 1);
|
|
if (!new_instance) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
|
|
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (!action) {
|
|
free(new_instance);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
action->type = ACTION_SERVICE_INSTANCE_SET;
|
|
action->data.srv_instance.service = s;
|
|
action->data.srv_instance.instance = new_instance;
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
free(new_instance);
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
esp_err_t mdns_service_remove(const char * service, const char * proto)
|
|
{
|
|
if (!_mdns_server || !_mdns_server->services || _str_null_or_empty(service) || _str_null_or_empty(proto)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
mdns_srv_item_t * s = _mdns_get_service_item(service, proto);
|
|
if (!s) {
|
|
return ESP_ERR_NOT_FOUND;
|
|
}
|
|
|
|
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (!action) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
action->type = ACTION_SERVICE_DEL;
|
|
action->data.srv_del.service = s;
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
esp_err_t mdns_service_remove_all()
|
|
{
|
|
if (!_mdns_server) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
if (!_mdns_server->services) {
|
|
return ESP_OK;
|
|
}
|
|
|
|
mdns_action_t * action = (mdns_action_t *)malloc(sizeof(mdns_action_t));
|
|
if (!action) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
action->type = ACTION_SERVICES_CLEAR;
|
|
if (xQueueSend(_mdns_server->action_queue, &action, (portTickType)0) != pdPASS) {
|
|
free(action);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
/*
|
|
* MDNS QUERY
|
|
* */
|
|
|
|
void mdns_query_results_free(mdns_result_t * results)
|
|
{
|
|
mdns_result_t * r;
|
|
mdns_ip_addr_t * a;
|
|
int i;
|
|
|
|
while (results) {
|
|
r = results;
|
|
|
|
free((char *)(r->hostname));
|
|
free((char *)(r->instance_name));
|
|
|
|
for (i=0; i<r->txt_count; i++) {
|
|
free((char *)(r->txt[i].key));
|
|
free((char *)(r->txt[i].value));
|
|
}
|
|
free(r->txt);
|
|
|
|
while (r->addr) {
|
|
a = r->addr;
|
|
r->addr = r->addr->next;
|
|
free(a);
|
|
}
|
|
|
|
results = results->next;
|
|
free(r);
|
|
}
|
|
}
|
|
|
|
esp_err_t mdns_query(const char * name, const char * service, const char * proto, uint16_t type, uint32_t timeout, size_t max_results, mdns_result_t ** results)
|
|
{
|
|
mdns_search_once_t * search = NULL;
|
|
|
|
*results = NULL;
|
|
|
|
if (!_mdns_server) {
|
|
return ESP_ERR_INVALID_STATE;
|
|
}
|
|
|
|
if (!timeout || _str_null_or_empty(service) != _str_null_or_empty(proto)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
|
|
search = _mdns_search_init(name, service, proto, type, timeout, max_results);
|
|
if (!search) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
|
|
if (_mdns_send_search_action(ACTION_SEARCH_ADD, search)) {
|
|
_mdns_search_free(search);
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
xSemaphoreTake(search->lock, portMAX_DELAY);
|
|
|
|
*results = search->result;
|
|
_mdns_search_free(search);
|
|
|
|
return ESP_OK;
|
|
}
|
|
|
|
esp_err_t mdns_query_ptr(const char * service, const char * proto, uint32_t timeout, size_t max_results, mdns_result_t ** results)
|
|
{
|
|
if (_str_null_or_empty(service) || _str_null_or_empty(proto)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
|
|
return mdns_query(NULL, service, proto, MDNS_TYPE_PTR, timeout, max_results, results);
|
|
}
|
|
|
|
esp_err_t mdns_query_srv(const char * instance, const char * service, const char * proto, uint32_t timeout, mdns_result_t ** result)
|
|
{
|
|
if (_str_null_or_empty(instance) || _str_null_or_empty(service) || _str_null_or_empty(proto)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
|
|
return mdns_query(instance, service, proto, MDNS_TYPE_SRV, timeout, 1, result);
|
|
}
|
|
|
|
esp_err_t mdns_query_txt(const char * instance, const char * service, const char * proto, uint32_t timeout, mdns_result_t ** result)
|
|
{
|
|
if (_str_null_or_empty(instance) || _str_null_or_empty(service) || _str_null_or_empty(proto)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
|
|
return mdns_query(instance, service, proto, MDNS_TYPE_TXT, timeout, 1, result);
|
|
}
|
|
|
|
esp_err_t mdns_query_a(const char * name, uint32_t timeout, ip4_addr_t * addr)
|
|
{
|
|
mdns_result_t * result = NULL;
|
|
esp_err_t err;
|
|
|
|
if (_str_null_or_empty(name)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
|
|
err = mdns_query(name, NULL, NULL, MDNS_TYPE_A, timeout, 1, &result);
|
|
|
|
if (err) {
|
|
return err;
|
|
}
|
|
|
|
if (!result) {
|
|
return ESP_ERR_NOT_FOUND;
|
|
}
|
|
|
|
mdns_ip_addr_t * a = result->addr;
|
|
while (a) {
|
|
if (a->addr.type == IPADDR_TYPE_V4) {
|
|
addr->addr = a->addr.u_addr.ip4.addr;
|
|
mdns_query_results_free(result);
|
|
return ESP_OK;
|
|
}
|
|
a = a->next;
|
|
}
|
|
|
|
mdns_query_results_free(result);
|
|
return ESP_ERR_NOT_FOUND;
|
|
}
|
|
|
|
esp_err_t mdns_query_aaaa(const char * name, uint32_t timeout, ip6_addr_t * addr)
|
|
{
|
|
mdns_result_t * result = NULL;
|
|
esp_err_t err;
|
|
|
|
if (_str_null_or_empty(name)) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
|
|
err = mdns_query(name, NULL, NULL, MDNS_TYPE_AAAA, timeout, 1, &result);
|
|
|
|
if (err) {
|
|
return err;
|
|
}
|
|
|
|
if (!result) {
|
|
return ESP_ERR_NOT_FOUND;
|
|
}
|
|
|
|
mdns_ip_addr_t * a = result->addr;
|
|
while (a) {
|
|
if (a->addr.type == IPADDR_TYPE_V6) {
|
|
memcpy(addr->addr, a->addr.u_addr.ip6.addr, 16);
|
|
mdns_query_results_free(result);
|
|
return ESP_OK;
|
|
}
|
|
a = a->next;
|
|
}
|
|
|
|
mdns_query_results_free(result);
|
|
return ESP_ERR_NOT_FOUND;
|
|
}
|
|
|
|
#ifdef MDNS_ENABLE_DEBUG
|
|
|
|
void mdns_debug_packet(const uint8_t * data, size_t len)
|
|
{
|
|
static mdns_name_t n;
|
|
mdns_header_t header;
|
|
const uint8_t * content = data + MDNS_HEAD_LEN;
|
|
uint32_t t = xTaskGetTickCount() * portTICK_PERIOD_MS;
|
|
mdns_name_t * name = &n;
|
|
memset(name, 0, sizeof(mdns_name_t));
|
|
|
|
_mdns_dbg_printf("Packet[%u]: ", t);
|
|
|
|
header.id = _mdns_read_u16(data, MDNS_HEAD_ID_OFFSET);
|
|
header.flags.value = _mdns_read_u16(data, MDNS_HEAD_FLAGS_OFFSET);
|
|
header.questions = _mdns_read_u16(data, MDNS_HEAD_QUESTIONS_OFFSET);
|
|
header.answers = _mdns_read_u16(data, MDNS_HEAD_ANSWERS_OFFSET);
|
|
header.servers = _mdns_read_u16(data, MDNS_HEAD_SERVERS_OFFSET);
|
|
header.additional = _mdns_read_u16(data, MDNS_HEAD_ADDITIONAL_OFFSET);
|
|
|
|
_mdns_dbg_printf("%s",
|
|
(header.flags.value == MDNS_FLAGS_AUTHORITATIVE)?"AUTHORITATIVE\n":
|
|
(header.flags.value == MDNS_FLAGS_DISTRIBUTED)?"DISTRIBUTED\n":
|
|
(header.flags.value == 0)?"\n":" "
|
|
);
|
|
if (header.flags.value && header.flags.value != MDNS_FLAGS_AUTHORITATIVE) {
|
|
_mdns_dbg_printf("0x%04X\n", header.flags.value);
|
|
}
|
|
|
|
if (header.questions) {
|
|
uint8_t qs = header.questions;
|
|
|
|
while (qs--) {
|
|
content = _mdns_parse_fqdn(data, content, name);
|
|
if (!content) {
|
|
header.answers = 0;
|
|
header.additional = 0;
|
|
header.servers = 0;
|
|
_mdns_dbg_printf("ERROR: %s:%u\n", __FILE__, __LINE__);
|
|
break;
|
|
}
|
|
|
|
uint16_t type = _mdns_read_u16(content, MDNS_TYPE_OFFSET);
|
|
uint16_t clas = _mdns_read_u16(content, MDNS_CLASS_OFFSET);
|
|
bool unicast = !!(clas & 0x8000);
|
|
clas &= 0x7FFF;
|
|
content = content + 4;
|
|
|
|
_mdns_dbg_printf(" Q: ");
|
|
if (unicast) {
|
|
_mdns_dbg_printf("*U* ");
|
|
}
|
|
if (type == MDNS_TYPE_PTR) {
|
|
_mdns_dbg_printf("%s.%s%s.%s.%s. PTR ", name->host, name->sub?"_sub.":"", name->service, name->proto, name->domain);
|
|
} else if (type == MDNS_TYPE_SRV) {
|
|
_mdns_dbg_printf("%s.%s%s.%s.%s. SRV ", name->host, name->sub?"_sub.":"", name->service, name->proto, name->domain);
|
|
} else if (type == MDNS_TYPE_TXT) {
|
|
_mdns_dbg_printf("%s.%s%s.%s.%s. TXT ", name->host, name->sub?"_sub.":"", name->service, name->proto, name->domain);
|
|
} else if (type == MDNS_TYPE_A) {
|
|
_mdns_dbg_printf("%s.%s. A ", name->host, name->domain);
|
|
} else if (type == MDNS_TYPE_AAAA) {
|
|
_mdns_dbg_printf("%s.%s. AAAA ", name->host, name->domain);
|
|
} else if (type == MDNS_TYPE_NSEC) {
|
|
_mdns_dbg_printf("%s.%s%s.%s.%s. NSEC ", name->host, name->sub?"_sub.":"", name->service, name->proto, name->domain);
|
|
} else if (type == MDNS_TYPE_ANY) {
|
|
_mdns_dbg_printf("%s.%s%s.%s.%s. ANY ", name->host, name->sub?"_sub.":"", name->service, name->proto, name->domain);
|
|
} else {
|
|
_mdns_dbg_printf("%s.%s%s.%s.%s. %04X ", name->host, name->sub?"_sub.":"", name->service, name->proto, name->domain, type);
|
|
}
|
|
|
|
if (clas == 0x0001) {
|
|
_mdns_dbg_printf("IN");
|
|
} else {
|
|
_mdns_dbg_printf("%04X", clas);
|
|
}
|
|
_mdns_dbg_printf("\n");
|
|
}
|
|
}
|
|
|
|
if (header.answers || header.servers || header.additional) {
|
|
uint16_t recordIndex = 0;
|
|
|
|
while (content < (data + len)) {
|
|
|
|
content = _mdns_parse_fqdn(data, content, name);
|
|
if (!content) {
|
|
_mdns_dbg_printf("ERROR: %s:%u\n", __FILE__, __LINE__);
|
|
break;
|
|
}
|
|
|
|
uint16_t type = _mdns_read_u16(content, MDNS_TYPE_OFFSET);
|
|
uint16_t clas = _mdns_read_u16(content, MDNS_CLASS_OFFSET);
|
|
uint32_t ttl = _mdns_read_u32(content, MDNS_TTL_OFFSET);
|
|
uint16_t data_len = _mdns_read_u16(content, MDNS_LEN_OFFSET);
|
|
const uint8_t * data_ptr = content + MDNS_DATA_OFFSET;
|
|
bool flush = !!(clas & 0x8000);
|
|
clas &= 0x7FFF;
|
|
|
|
content = data_ptr + data_len;
|
|
if (content > (data + len)) {
|
|
_mdns_dbg_printf("ERROR: %s:%u\n", __FILE__, __LINE__);
|
|
break;
|
|
}
|
|
|
|
mdns_parsed_recort_type_t record_type = MDNS_ANSWER;
|
|
|
|
if (recordIndex >= (header.answers + header.servers)) {
|
|
record_type = MDNS_EXTRA;
|
|
} else if (recordIndex >= (header.answers)) {
|
|
record_type = MDNS_NS;
|
|
}
|
|
recordIndex++;
|
|
|
|
if (record_type == MDNS_EXTRA) {
|
|
_mdns_dbg_printf(" X");
|
|
} else if (record_type == MDNS_NS) {
|
|
_mdns_dbg_printf(" S");
|
|
} else {
|
|
_mdns_dbg_printf(" A");
|
|
}
|
|
|
|
if (type == MDNS_TYPE_PTR) {
|
|
_mdns_dbg_printf(": %s%s%s.%s.%s. PTR ", name->host, name->host[0]?".":"", name->service, name->proto, name->domain);
|
|
} else if (type == MDNS_TYPE_SRV) {
|
|
_mdns_dbg_printf(": %s.%s.%s.%s. SRV ", name->host, name->service, name->proto, name->domain);
|
|
} else if (type == MDNS_TYPE_TXT) {
|
|
_mdns_dbg_printf(": %s.%s.%s.%s. TXT ", name->host, name->service, name->proto, name->domain);
|
|
} else if (type == MDNS_TYPE_A) {
|
|
_mdns_dbg_printf(": %s.%s. A ", name->host, name->domain);
|
|
} else if (type == MDNS_TYPE_AAAA) {
|
|
_mdns_dbg_printf(": %s.%s. AAAA ", name->host, name->domain);
|
|
} else if (type == MDNS_TYPE_NSEC) {
|
|
_mdns_dbg_printf(": %s.%s.%s.%s. NSEC ", name->host, name->service, name->proto, name->domain);
|
|
} else if (type == MDNS_TYPE_ANY) {
|
|
_mdns_dbg_printf(": %s.%s.%s.%s. ANY ", name->host, name->service, name->proto, name->domain);
|
|
} else if (type == MDNS_TYPE_OPT) {
|
|
_mdns_dbg_printf(": . OPT ");
|
|
} else {
|
|
_mdns_dbg_printf(": %s.%s.%s.%s. %04X ", name->host, name->service, name->proto, name->domain, type);
|
|
}
|
|
|
|
if (clas == 0x0001) {
|
|
_mdns_dbg_printf("IN ");
|
|
} else {
|
|
_mdns_dbg_printf("%04X ", clas);
|
|
}
|
|
if (flush) {
|
|
_mdns_dbg_printf("FLUSH ");
|
|
}
|
|
_mdns_dbg_printf("%u ", ttl);
|
|
_mdns_dbg_printf("[%u] ", data_len);
|
|
if (type == MDNS_TYPE_PTR) {
|
|
if (!_mdns_parse_fqdn(data, data_ptr, name)) {
|
|
_mdns_dbg_printf("ERROR: %s:%u\n", __FILE__, __LINE__);
|
|
continue;
|
|
}
|
|
_mdns_dbg_printf("%s.%s.%s.%s.\n", name->host, name->service, name->proto, name->domain);
|
|
} else if (type == MDNS_TYPE_SRV) {
|
|
if (!_mdns_parse_fqdn(data, data_ptr + MDNS_SRV_FQDN_OFFSET, name)) {
|
|
_mdns_dbg_printf("ERROR: %s:%u\n", __FILE__, __LINE__);
|
|
continue;
|
|
}
|
|
uint16_t priority = _mdns_read_u16(data_ptr, MDNS_SRV_PRIORITY_OFFSET);
|
|
uint16_t weight = _mdns_read_u16(data_ptr, MDNS_SRV_WEIGHT_OFFSET);
|
|
uint16_t port = _mdns_read_u16(data_ptr, MDNS_SRV_PORT_OFFSET);
|
|
_mdns_dbg_printf("%u %u %u %s.%s.\n", priority, weight, port, name->host, name->domain);
|
|
} else if (type == MDNS_TYPE_TXT) {
|
|
uint16_t i=0, y;
|
|
while (i < data_len) {
|
|
uint8_t partLen = data_ptr[i++];
|
|
if ((i+partLen) > data_len) {
|
|
_mdns_dbg_printf("ERROR: %s:%u\n", __FILE__, __LINE__);
|
|
break;
|
|
}
|
|
char txt[partLen+1];
|
|
for (y=0; y<partLen; y++) {
|
|
char d = data_ptr[i++];
|
|
txt[y] = d;
|
|
}
|
|
txt[partLen] = 0;
|
|
_mdns_dbg_printf("%s", txt);
|
|
if (i<data_len) {
|
|
_mdns_dbg_printf("; ");
|
|
}
|
|
}
|
|
_mdns_dbg_printf("\n");
|
|
} else if (type == MDNS_TYPE_AAAA) {
|
|
ip6_addr_t ip6;
|
|
memcpy(&ip6, data_ptr, sizeof(ip6_addr_t));
|
|
_mdns_dbg_printf(IPV6STR "\n", IPV62STR(ip6));
|
|
} else if (type == MDNS_TYPE_A) {
|
|
ip4_addr_t ip;
|
|
memcpy(&ip, data_ptr, sizeof(ip4_addr_t));
|
|
_mdns_dbg_printf(IPSTR "\n", IP2STR(&ip));
|
|
} else if (type == MDNS_TYPE_NSEC) {
|
|
const uint8_t * old_ptr = data_ptr;
|
|
const uint8_t * new_ptr = _mdns_parse_fqdn(data, data_ptr, name);
|
|
if (new_ptr) {
|
|
_mdns_dbg_printf("%s.%s.%s.%s. ", name->host, name->service, name->proto, name->domain);
|
|
size_t diff = new_ptr - old_ptr;
|
|
data_len -= diff;
|
|
data_ptr = new_ptr;
|
|
}
|
|
size_t i;
|
|
for (i=0; i<data_len; i++) {
|
|
_mdns_dbg_printf(" %02x", data_ptr[i]);
|
|
}
|
|
_mdns_dbg_printf("\n");
|
|
} else if (type == MDNS_TYPE_OPT) {
|
|
uint16_t opCode = _mdns_read_u16(data_ptr, 0);
|
|
uint16_t opLen = _mdns_read_u16(data_ptr, 2);
|
|
_mdns_dbg_printf(" Code: %04x Data[%u]:", opCode, opLen);
|
|
size_t i;
|
|
for (i=4; i<data_len; i++) {
|
|
_mdns_dbg_printf(" %02x", data_ptr[i]);
|
|
}
|
|
_mdns_dbg_printf("\n");
|
|
} else {
|
|
size_t i;
|
|
for (i=0; i<data_len; i++) {
|
|
_mdns_dbg_printf(" %02x", data_ptr[i]);
|
|
}
|
|
_mdns_dbg_printf("\n");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|