285 lines
8.2 KiB
C
285 lines
8.2 KiB
C
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/*
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* MDNS Server Networking
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*
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*/
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#include <string.h>
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#include "mdns_networking.h"
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extern mdns_server_t * _mdns_server;
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/*
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* MDNS Server Networking
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*
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*/
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/**
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* @brief the receive callback of the raw udp api. Packets are received here
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*
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*/
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static void _udp_recv(void *arg, struct udp_pcb *upcb, struct pbuf *pb, const ip_addr_t *raddr, uint16_t rport)
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{
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uint8_t i;
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while (pb != NULL) {
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struct pbuf * this_pb = pb;
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pb = pb->next;
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this_pb->next = NULL;
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mdns_rx_packet_t * packet = (mdns_rx_packet_t *)malloc(sizeof(mdns_rx_packet_t));
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if (!packet) {
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//missed packet - no memory
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pbuf_free(this_pb);
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continue;
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}
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packet->tcpip_if = TCPIP_ADAPTER_IF_MAX;
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packet->pb = this_pb;
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packet->src_port = rport;
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memcpy(&packet->src, raddr, sizeof(ip_addr_t));
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packet->dest.type = packet->src.type;
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if (packet->src.type == IPADDR_TYPE_V4) {
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packet->ip_protocol = MDNS_IP_PROTOCOL_V4;
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struct ip_hdr * iphdr = (struct ip_hdr *)(((uint8_t *)(packet->pb->payload)) - UDP_HLEN - IP_HLEN);
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packet->dest.u_addr.ip4.addr = iphdr->dest.addr;
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} else {
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packet->ip_protocol = MDNS_IP_PROTOCOL_V6;
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struct ip6_hdr * ip6hdr = (struct ip6_hdr *)(((uint8_t *)(packet->pb->payload)) - UDP_HLEN - IP6_HLEN);
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memcpy(&packet->dest.u_addr.ip6.addr, (uint8_t *)ip6hdr->dest.addr, 16);
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}
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packet->multicast = ip_addr_ismulticast(&(packet->dest));
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//lwip does not return the proper pcb if you have more than one for the same multicast address (but different interfaces)
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struct netif * netif = NULL;
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void * nif = NULL;
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struct udp_pcb * pcb = NULL;
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for (i=0; i<TCPIP_ADAPTER_IF_MAX; i++) {
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pcb = _mdns_server->interfaces[i].pcbs[packet->ip_protocol].pcb;
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tcpip_adapter_get_netif (i, &nif);
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netif = (struct netif *)nif;
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if (pcb && netif && netif == ip_current_input_netif ()) {
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if (packet->src.type == IPADDR_TYPE_V4) {
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if ((packet->src.u_addr.ip4.addr & netif->netmask.u_addr.ip4.addr) != (netif->ip_addr.u_addr.ip4.addr & netif->netmask.u_addr.ip4.addr)) {
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//packet source is not in the same subnet
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pcb = NULL;
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break;
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}
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}
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packet->tcpip_if = i;
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break;
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}
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pcb = NULL;
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}
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if (!pcb || !_mdns_server || !_mdns_server->action_queue
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|| _mdns_send_rx_action(packet) != ESP_OK) {
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pbuf_free(this_pb);
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free(packet);
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}
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}
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}
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/**
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* @brief Stop PCB Main code
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*/
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static void _udp_pcb_deinit(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
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{
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if (!_mdns_server) {
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return;
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}
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mdns_pcb_t * _pcb = &_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol];
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if (_pcb->pcb) {
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_pcb->state = PCB_OFF;
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udp_recv(_pcb->pcb, NULL, NULL);
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udp_disconnect(_pcb->pcb);
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udp_remove(_pcb->pcb);
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free(_pcb->probe_services);
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_pcb->pcb = NULL;
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_pcb->probe_ip = false;
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_pcb->probe_services = NULL;
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_pcb->probe_services_len = 0;
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_pcb->probe_running = false;
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_pcb->failed_probes = 0;
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}
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}
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/**
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* @brief Start PCB V4
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*/
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static esp_err_t _udp_pcb_v4_init(tcpip_adapter_if_t tcpip_if)
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{
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tcpip_adapter_ip_info_t if_ip_info;
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if (!_mdns_server || _mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].pcb) {
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return ESP_ERR_INVALID_STATE;
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}
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if (tcpip_adapter_get_ip_info(tcpip_if, &if_ip_info) || if_ip_info.ip.addr == 0) {
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return ESP_ERR_INVALID_ARG;
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}
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ip_addr_t interface_addr = IPADDR4_INIT(if_ip_info.ip.addr);
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ip_addr_t multicast_addr;
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IP_ADDR4(&multicast_addr, 224, 0, 0, 251);
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if (igmp_joingroup((const struct ip4_addr *)&interface_addr.u_addr.ip4, (const struct ip4_addr *)&multicast_addr.u_addr.ip4)) {
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return ESP_ERR_INVALID_STATE;
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}
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struct udp_pcb * pcb = udp_new_ip_type(IPADDR_TYPE_V4);
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if (!pcb) {
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return ESP_ERR_NO_MEM;
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}
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if (udp_bind(pcb, &interface_addr, MDNS_SERVICE_PORT) != 0) {
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udp_remove(pcb);
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return ESP_ERR_INVALID_STATE;
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}
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pcb->mcast_ttl = 1;
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pcb->remote_port = MDNS_SERVICE_PORT;
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ip_addr_copy(pcb->multicast_ip, interface_addr);
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ip_addr_copy(pcb->remote_ip, multicast_addr);
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_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].pcb = pcb;
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_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].failed_probes = 0;
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udp_recv(pcb, &_udp_recv, _mdns_server);
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return ESP_OK;
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}
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/**
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* @brief Start PCB V6
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*/
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static esp_err_t _udp_pcb_v6_init(tcpip_adapter_if_t tcpip_if)
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{
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ip_addr_t multicast_addr = IPADDR6_INIT(0x000002ff, 0, 0, 0xfb000000);
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ip_addr_t interface_addr;
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interface_addr.type = IPADDR_TYPE_V6;
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if (!_mdns_server || _mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].pcb) {
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return ESP_ERR_INVALID_STATE;
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}
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if (tcpip_adapter_get_ip6_linklocal(tcpip_if, &interface_addr.u_addr.ip6)) {
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return ESP_ERR_INVALID_ARG;
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}
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if (mld6_joingroup(&(interface_addr.u_addr.ip6), &(multicast_addr.u_addr.ip6))) {
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return ESP_ERR_INVALID_STATE;
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}
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struct udp_pcb * pcb = udp_new_ip_type(IPADDR_TYPE_V6);
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if (!pcb) {
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return ESP_ERR_NO_MEM;
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}
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if (udp_bind(pcb, &interface_addr, MDNS_SERVICE_PORT) != 0) {
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udp_remove(pcb);
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return ESP_ERR_INVALID_STATE;
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}
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pcb->remote_port = MDNS_SERVICE_PORT;
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ip_addr_copy(pcb->remote_ip, multicast_addr);
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_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].pcb = pcb;
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_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].failed_probes = 0;
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udp_recv(pcb, &_udp_recv, _mdns_server);
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return ESP_OK;
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}
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/**
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* @brief Start PCB Main code
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*/
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static esp_err_t _udp_pcb_init(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
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{
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if (ip_protocol == MDNS_IP_PROTOCOL_V4) {
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return _udp_pcb_v4_init(tcpip_if);
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} else if (ip_protocol == MDNS_IP_PROTOCOL_V6) {
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return _udp_pcb_v6_init(tcpip_if);
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}
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return ESP_ERR_INVALID_ARG;
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}
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typedef struct {
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struct tcpip_api_call call;
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tcpip_adapter_if_t tcpip_if;
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mdns_ip_protocol_t ip_protocol;
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esp_err_t err;
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} mdns_api_call_t;
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/**
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* @brief Start PCB from LwIP thread
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*/
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static err_t _mdns_pcb_init_api(struct tcpip_api_call *api_call_msg)
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{
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mdns_api_call_t * msg = (mdns_api_call_t *)api_call_msg;
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msg->err = _udp_pcb_init(msg->tcpip_if, msg->ip_protocol);
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return msg->err;
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}
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/**
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* @brief Stop PCB from LwIP thread
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*/
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static err_t _mdns_pcb_deinit_api(struct tcpip_api_call *api_call_msg)
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{
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mdns_api_call_t * msg = (mdns_api_call_t *)api_call_msg;
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_udp_pcb_deinit(msg->tcpip_if, msg->ip_protocol);
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msg->err = ESP_OK;
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return ESP_OK;
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}
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/*
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* Non-static functions below are
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* - _mdns prefixed
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* - commented in mdns_networking.h header
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*/
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esp_err_t _mdns_pcb_init(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
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{
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mdns_api_call_t msg = {
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.tcpip_if = tcpip_if,
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.ip_protocol = ip_protocol
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};
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tcpip_api_call(_mdns_pcb_init_api, (struct tcpip_api_call*)&msg);
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return msg.err;
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}
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esp_err_t _mdns_pcb_deinit(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
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{
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mdns_api_call_t msg = {
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.tcpip_if = tcpip_if,
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.ip_protocol = ip_protocol
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};
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tcpip_api_call(_mdns_pcb_deinit_api, (struct tcpip_api_call*)&msg);
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return msg.err;
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}
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size_t _mdns_udp_pcb_write(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, const ip_addr_t *ip, uint16_t port, uint8_t * data, size_t len)
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{
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struct netif * netif = NULL;
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void * nif = NULL;
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esp_err_t err = tcpip_adapter_get_netif(tcpip_if, &nif);
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netif = (struct netif *)nif;
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if (err) {
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return 0;
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}
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struct pbuf* pbt = pbuf_alloc(PBUF_TRANSPORT, len, PBUF_RAM);
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if (pbt == NULL) {
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return 0;
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}
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memcpy((uint8_t *)pbt->payload, data, len);
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err = udp_sendto_if (_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].pcb, pbt, ip, port, netif);
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pbuf_free(pbt);
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if (err) {
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return 0;
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}
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return len;
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}
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