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netdata/libnetdata/socket/socket.c

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// SPDX-License-Identifier: GPL-3.0-or-later
#include "../libnetdata.h"
// --------------------------------------------------------------------------------------------------------------------
// various library calls
#ifdef __gnu_linux__
#define LARGE_SOCK_SIZE 33554431 // don't ask why - I found it at brubeck source - I guess it is just a large number
#else
#define LARGE_SOCK_SIZE 4096
#endif
int sock_setnonblock(int fd) {
int flags;
flags = fcntl(fd, F_GETFL);
flags |= O_NONBLOCK;
int ret = fcntl(fd, F_SETFL, flags);
if(ret < 0)
error("Failed to set O_NONBLOCK on socket %d", fd);
return ret;
}
int sock_delnonblock(int fd) {
int flags;
flags = fcntl(fd, F_GETFL);
flags &= ~O_NONBLOCK;
int ret = fcntl(fd, F_SETFL, flags);
if(ret < 0)
error("Failed to remove O_NONBLOCK on socket %d", fd);
return ret;
}
int sock_setreuse(int fd, int reuse) {
int ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
if(ret == -1)
error("Failed to set SO_REUSEADDR on socket %d", fd);
return ret;
}
int sock_setreuse_port(int fd, int reuse) {
int ret;
#ifdef SO_REUSEPORT
ret = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &reuse, sizeof(reuse));
if(ret == -1 && errno != ENOPROTOOPT)
error("failed to set SO_REUSEPORT on socket %d", fd);
#else
ret = -1;
#endif
return ret;
}
int sock_enlarge_in(int fd) {
int ret, bs = LARGE_SOCK_SIZE;
ret = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bs, sizeof(bs));
if(ret == -1)
error("Failed to set SO_RCVBUF on socket %d", fd);
return ret;
}
int sock_enlarge_out(int fd) {
int ret, bs = LARGE_SOCK_SIZE;
ret = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &bs, sizeof(bs));
if(ret == -1)
error("Failed to set SO_SNDBUF on socket %d", fd);
return ret;
}
// --------------------------------------------------------------------------------------------------------------------
char *strdup_client_description(int family, const char *protocol, const char *ip, uint16_t port) {
char buffer[100 + 1];
switch(family) {
case AF_INET:
snprintfz(buffer, 100, "%s:%s:%d", protocol, ip, port);
break;
case AF_INET6:
default:
snprintfz(buffer, 100, "%s:[%s]:%d", protocol, ip, port);
break;
case AF_UNIX:
snprintfz(buffer, 100, "%s:%s", protocol, ip);
break;
}
return strdupz(buffer);
}
// --------------------------------------------------------------------------------------------------------------------
// listening sockets
int create_listen_socket_unix(const char *path, int listen_backlog) {
int sock;
debug(D_LISTENER, "LISTENER: UNIX creating new listening socket on path '%s'", path);
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if(sock < 0) {
error("LISTENER: UNIX socket() on path '%s' failed.", path);
return -1;
}
sock_setnonblock(sock);
sock_enlarge_in(sock);
struct sockaddr_un name;
memset(&name, 0, sizeof(struct sockaddr_un));
name.sun_family = AF_UNIX;
strncpy(name.sun_path, path, sizeof(name.sun_path)-1);
errno = 0;
if (unlink(path) == -1 && errno != ENOENT)
error("LISTENER: failed to remove existing (probably obsolete or left-over) file on UNIX socket path '%s'.", path);
if(bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {
close(sock);
error("LISTENER: UNIX bind() on path '%s' failed.", path);
return -1;
}
// we have to chmod this to 0777 so that the client will be able
// to read from and write to this socket.
if(chmod(path, 0777) == -1)
error("LISTENER: failed to chmod() socket file '%s'.", path);
if(listen(sock, listen_backlog) < 0) {
close(sock);
error("LISTENER: UNIX listen() on path '%s' failed.", path);
return -1;
}
debug(D_LISTENER, "LISTENER: Listening on UNIX path '%s'", path);
return sock;
}
int create_listen_socket4(int socktype, const char *ip, uint16_t port, int listen_backlog) {
int sock;
debug(D_LISTENER, "LISTENER: IPv4 creating new listening socket on ip '%s' port %d, socktype %d", ip, port, socktype);
sock = socket(AF_INET, socktype, 0);
if(sock < 0) {
error("LISTENER: IPv4 socket() on ip '%s' port %d, socktype %d failed.", ip, port, socktype);
return -1;
}
sock_setreuse(sock, 1);
sock_setreuse_port(sock, 1);
sock_setnonblock(sock);
sock_enlarge_in(sock);
struct sockaddr_in name;
memset(&name, 0, sizeof(struct sockaddr_in));
name.sin_family = AF_INET;
name.sin_port = htons (port);
int ret = inet_pton(AF_INET, ip, (void *)&name.sin_addr.s_addr);
if(ret != 1) {
error("LISTENER: Failed to convert IP '%s' to a valid IPv4 address.", ip);
close(sock);
return -1;
}
if(bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {
close(sock);
error("LISTENER: IPv4 bind() on ip '%s' port %d, socktype %d failed.", ip, port, socktype);
return -1;
}
if(socktype == SOCK_STREAM && listen(sock, listen_backlog) < 0) {
close(sock);
error("LISTENER: IPv4 listen() on ip '%s' port %d, socktype %d failed.", ip, port, socktype);
return -1;
}
debug(D_LISTENER, "LISTENER: Listening on IPv4 ip '%s' port %d, socktype %d", ip, port, socktype);
return sock;
}
int create_listen_socket6(int socktype, uint32_t scope_id, const char *ip, int port, int listen_backlog) {
int sock;
int ipv6only = 1;
debug(D_LISTENER, "LISTENER: IPv6 creating new listening socket on ip '%s' port %d, socktype %d", ip, port, socktype);
sock = socket(AF_INET6, socktype, 0);
if (sock < 0) {
error("LISTENER: IPv6 socket() on ip '%s' port %d, socktype %d, failed.", ip, port, socktype);
return -1;
}
sock_setreuse(sock, 1);
sock_setreuse_port(sock, 1);
sock_setnonblock(sock);
sock_enlarge_in(sock);
/* IPv6 only */
if(setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&ipv6only, sizeof(ipv6only)) != 0)
error("LISTENER: Cannot set IPV6_V6ONLY on ip '%s' port %d, socktype %d.", ip, port, socktype);
struct sockaddr_in6 name;
memset(&name, 0, sizeof(struct sockaddr_in6));
name.sin6_family = AF_INET6;
name.sin6_port = htons ((uint16_t) port);
name.sin6_scope_id = scope_id;
int ret = inet_pton(AF_INET6, ip, (void *)&name.sin6_addr.s6_addr);
if(ret != 1) {
error("LISTENER: Failed to convert IP '%s' to a valid IPv6 address.", ip);
close(sock);
return -1;
}
name.sin6_scope_id = scope_id;
if (bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {
close(sock);
error("LISTENER: IPv6 bind() on ip '%s' port %d, socktype %d failed.", ip, port, socktype);
return -1;
}
if (socktype == SOCK_STREAM && listen(sock, listen_backlog) < 0) {
close(sock);
error("LISTENER: IPv6 listen() on ip '%s' port %d, socktype %d failed.", ip, port, socktype);
return -1;
}
debug(D_LISTENER, "LISTENER: Listening on IPv6 ip '%s' port %d, socktype %d", ip, port, socktype);
return sock;
}
static inline int listen_sockets_add(LISTEN_SOCKETS *sockets, int fd, int family, int socktype, const char *protocol, const char *ip, uint16_t port, int acl_flags) {
if(sockets->opened >= MAX_LISTEN_FDS) {
error("LISTENER: Too many listening sockets. Failed to add listening %s socket at ip '%s' port %d, protocol %s, socktype %d", protocol, ip, port, protocol, socktype);
close(fd);
return -1;
}
sockets->fds[sockets->opened] = fd;
sockets->fds_types[sockets->opened] = socktype;
sockets->fds_families[sockets->opened] = family;
sockets->fds_names[sockets->opened] = strdup_client_description(family, protocol, ip, port);
sockets->fds_acl_flags[sockets->opened] = acl_flags;
sockets->opened++;
return 0;
}
int listen_sockets_check_is_member(LISTEN_SOCKETS *sockets, int fd) {
size_t i;
for(i = 0; i < sockets->opened ;i++)
if(sockets->fds[i] == fd) return 1;
return 0;
}
static inline void listen_sockets_init(LISTEN_SOCKETS *sockets) {
size_t i;
for(i = 0; i < MAX_LISTEN_FDS ;i++) {
sockets->fds[i] = -1;
sockets->fds_names[i] = NULL;
sockets->fds_types[i] = -1;
}
sockets->opened = 0;
sockets->failed = 0;
}
void listen_sockets_close(LISTEN_SOCKETS *sockets) {
size_t i;
for(i = 0; i < sockets->opened ;i++) {
close(sockets->fds[i]);
sockets->fds[i] = -1;
freez(sockets->fds_names[i]);
sockets->fds_names[i] = NULL;
sockets->fds_types[i] = -1;
}
sockets->opened = 0;
sockets->failed = 0;
}
WEB_CLIENT_ACL read_acl(char *st) {
if (!strcmp(st,"dashboard")) return WEB_CLIENT_ACL_DASHBOARD;
if (!strcmp(st,"registry")) return WEB_CLIENT_ACL_REGISTRY;
if (!strcmp(st,"badges")) return WEB_CLIENT_ACL_BADGE;
if (!strcmp(st,"management")) return WEB_CLIENT_ACL_MGMT;
if (!strcmp(st,"streaming")) return WEB_CLIENT_ACL_STREAMING;
if (!strcmp(st,"netdata.conf")) return WEB_CLIENT_ACL_NETDATACONF;
return WEB_CLIENT_ACL_NONE;
}
static inline int bind_to_this(LISTEN_SOCKETS *sockets, const char *definition, uint16_t default_port, int listen_backlog) {
int added = 0;
WEB_CLIENT_ACL acl_flags = WEB_CLIENT_ACL_NONE;
struct addrinfo hints;
struct addrinfo *result = NULL, *rp = NULL;
char buffer[strlen(definition) + 1];
strcpy(buffer, definition);
char buffer2[10 + 1];
snprintfz(buffer2, 10, "%d", default_port);
char *ip = buffer, *port = buffer2, *interface = "", *portconfig;;
int protocol = IPPROTO_TCP, socktype = SOCK_STREAM;
const char *protocol_str = "tcp";
int unix_socket=0;
if(strncmp(ip, "tcp:", 4) == 0) {
ip += 4;
protocol = IPPROTO_TCP;
socktype = SOCK_STREAM;
protocol_str = "tcp";
}
else if(strncmp(ip, "udp:", 4) == 0) {
ip += 4;
protocol = IPPROTO_UDP;
socktype = SOCK_DGRAM;
protocol_str = "udp";
}
else if(strncmp(ip, "unix:", 5) == 0) {
ip += 5;
socktype = SOCK_STREAM;
protocol_str = "unix";
unix_socket=1;
}
char *e = ip;
if(*e == '[') {
e = ++ip;
while(*e && *e != ']') e++;
if(*e == ']') {
*e = '\0';
e++;
}
}
else {
while(*e && *e != ':' && *e != '%' && *e != '=') e++;
}
if(*e == '%') {
*e = '\0';
e++;
interface = e;
while(*e && *e != ':' && *e != '=') e++;
}
if(*e == ':') {
port = e + 1;
*e = '\0';
while(*e && *e != '=') e++;
}
if(*e == '=') {
*e='\0';
e++;
portconfig = e;
while (*e != '\0') {
if (*e == '|') {
*e = '\0';
acl_flags |= read_acl(portconfig);
e++;
portconfig = e;
continue;
}
e++;
}
acl_flags |= read_acl(portconfig);
} else {
acl_flags = WEB_CLIENT_ACL_DASHBOARD | WEB_CLIENT_ACL_REGISTRY | WEB_CLIENT_ACL_BADGE | WEB_CLIENT_ACL_MGMT | WEB_CLIENT_ACL_NETDATACONF | WEB_CLIENT_ACL_STREAMING;
}
if (unix_socket) {
int fd = create_listen_socket_unix(port, listen_backlog);
if (fd == -1) {
error("LISTENER: Cannot create unix socket '%s'", port);
sockets->failed++;
} else {
listen_sockets_add(sockets, fd, AF_UNIX, socktype, protocol_str, port, 0, acl_flags);
added++;
}
return added;
}
uint32_t scope_id = 0;
if(*interface) {
scope_id = if_nametoindex(interface);
if(!scope_id)
error("LISTENER: Cannot find a network interface named '%s'. Continuing with limiting the network interface", interface);
}
if(!*ip || *ip == '*' || !strcmp(ip, "any") || !strcmp(ip, "all"))
ip = NULL;
if(!*port)
port = buffer2;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
hints.ai_socktype = socktype;
hints.ai_flags = AI_PASSIVE; /* For wildcard IP address */
hints.ai_protocol = protocol;
hints.ai_canonname = NULL;
hints.ai_addr = NULL;
hints.ai_next = NULL;
int r = getaddrinfo(ip, port, &hints, &result);
if (r != 0) {
error("LISTENER: getaddrinfo('%s', '%s'): %s\n", ip, port, gai_strerror(r));
return -1;
}
for (rp = result; rp != NULL; rp = rp->ai_next) {
int fd = -1;
int family;
char rip[INET_ADDRSTRLEN + INET6_ADDRSTRLEN] = "INVALID";
uint16_t rport = default_port;
family = rp->ai_addr->sa_family;
switch (family) {
case AF_INET: {
struct sockaddr_in *sin = (struct sockaddr_in *) rp->ai_addr;
inet_ntop(AF_INET, &sin->sin_addr, rip, INET_ADDRSTRLEN);
rport = ntohs(sin->sin_port);
// info("Attempting to listen on IPv4 '%s' ('%s'), port %d ('%s'), socktype %d", rip, ip, rport, port, socktype);
fd = create_listen_socket4(socktype, rip, rport, listen_backlog);
break;
}
case AF_INET6: {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) rp->ai_addr;
inet_ntop(AF_INET6, &sin6->sin6_addr, rip, INET6_ADDRSTRLEN);
rport = ntohs(sin6->sin6_port);
// info("Attempting to listen on IPv6 '%s' ('%s'), port %d ('%s'), socktype %d", rip, ip, rport, port, socktype);
fd = create_listen_socket6(socktype, scope_id, rip, rport, listen_backlog);
break;
}
default:
debug(D_LISTENER, "LISTENER: Unknown socket family %d", family);
break;
}
if (fd == -1) {
error("LISTENER: Cannot bind to ip '%s', port %d", rip, rport);
sockets->failed++;
}
else {
listen_sockets_add(sockets, fd, family, socktype, protocol_str, rip, rport, acl_flags);
added++;
}
}
freeaddrinfo(result);
return added;
}
int listen_sockets_setup(LISTEN_SOCKETS *sockets) {
listen_sockets_init(sockets);
sockets->backlog = (int) appconfig_get_number(sockets->config, sockets->config_section, "listen backlog", sockets->backlog);
long long int old_port = sockets->default_port;
long long int new_port = appconfig_get_number(sockets->config, sockets->config_section, "default port", sockets->default_port);
if(new_port < 1 || new_port > 65535) {
error("LISTENER: Invalid listen port %lld given. Defaulting to %lld.", new_port, old_port);
sockets->default_port = (uint16_t) appconfig_set_number(sockets->config, sockets->config_section, "default port", old_port);
}
else sockets->default_port = (uint16_t)new_port;
debug(D_OPTIONS, "LISTENER: Default listen port set to %d.", sockets->default_port);
char *s = appconfig_get(sockets->config, sockets->config_section, "bind to", sockets->default_bind_to);
while(*s) {
char *e = s;
// skip separators, moving both s(tart) and e(nd)
while(isspace(*e) || *e == ',') s = ++e;
// move e(nd) to the first separator
while(*e && !isspace(*e) && *e != ',') e++;
// is there anything?
if(!*s || s == e) break;
char buf[e - s + 1];
strncpyz(buf, s, e - s);
bind_to_this(sockets, buf, sockets->default_port, sockets->backlog);
s = e;
}
if(sockets->failed) {
size_t i;
for(i = 0; i < sockets->opened ;i++)
info("LISTENER: Listen socket %s opened successfully.", sockets->fds_names[i]);
}
return (int)sockets->opened;
}
// --------------------------------------------------------------------------------------------------------------------
// connect to another host/port
// connect_to_this_unix()
// path the path of the unix socket
// timeout the timeout for establishing a connection
static inline int connect_to_unix(const char *path, struct timeval *timeout) {
int fd = socket(AF_UNIX, SOCK_STREAM, 0);
if(fd == -1) {
error("Failed to create UNIX socket() for '%s'", path);
return -1;
}
if(timeout) {
if(setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (char *) timeout, sizeof(struct timeval)) < 0)
error("Failed to set timeout on UNIX socket '%s'", path);
}
struct sockaddr_un addr;
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, path, sizeof(addr.sun_path)-1);
if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) == -1) {
error("Cannot connect to UNIX socket on path '%s'.", path);
close(fd);
return -1;
}
debug(D_CONNECT_TO, "Connected to UNIX socket on path '%s'.", path);
return fd;
}
// connect_to_this_ip46()
// protocol IPPROTO_TCP, IPPROTO_UDP
// socktype SOCK_STREAM, SOCK_DGRAM
// host the destination hostname or IP address (IPv4 or IPv6) to connect to
// if it resolves to many IPs, all are tried (IPv4 and IPv6)
// scope_id the if_index id of the interface to use for connecting (0 = any)
// (used only under IPv6)
// service the service name or port to connect to
// timeout the timeout for establishing a connection
static inline int connect_to_this_ip46(int protocol, int socktype, const char *host, uint32_t scope_id, const char *service, struct timeval *timeout) {
struct addrinfo hints;
struct addrinfo *ai_head = NULL, *ai = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC; /* Allow IPv4 or IPv6 */
hints.ai_socktype = socktype;
hints.ai_protocol = protocol;
int ai_err = getaddrinfo(host, service, &hints, &ai_head);
if (ai_err != 0) {
error("Cannot resolve host '%s', port '%s': %s", host, service, gai_strerror(ai_err));
return -1;
}
int fd = -1;
for (ai = ai_head; ai != NULL && fd == -1; ai = ai->ai_next) {
if (ai->ai_family == PF_INET6) {
struct sockaddr_in6 *pSadrIn6 = (struct sockaddr_in6 *) ai->ai_addr;
if(pSadrIn6->sin6_scope_id == 0) {
pSadrIn6->sin6_scope_id = scope_id;
}
}
char hostBfr[NI_MAXHOST + 1];
char servBfr[NI_MAXSERV + 1];
getnameinfo(ai->ai_addr,
ai->ai_addrlen,
hostBfr,
sizeof(hostBfr),
servBfr,
sizeof(servBfr),
NI_NUMERICHOST | NI_NUMERICSERV);
debug(D_CONNECT_TO, "Address info: host = '%s', service = '%s', ai_flags = 0x%02X, ai_family = %d (PF_INET = %d, PF_INET6 = %d), ai_socktype = %d (SOCK_STREAM = %d, SOCK_DGRAM = %d), ai_protocol = %d (IPPROTO_TCP = %d, IPPROTO_UDP = %d), ai_addrlen = %lu (sockaddr_in = %lu, sockaddr_in6 = %lu)",
hostBfr,
servBfr,
(unsigned int)ai->ai_flags,
ai->ai_family,
PF_INET,
PF_INET6,
ai->ai_socktype,
SOCK_STREAM,
SOCK_DGRAM,
ai->ai_protocol,
IPPROTO_TCP,
IPPROTO_UDP,
(unsigned long)ai->ai_addrlen,
(unsigned long)sizeof(struct sockaddr_in),
(unsigned long)sizeof(struct sockaddr_in6));
switch (ai->ai_addr->sa_family) {
case PF_INET: {
struct sockaddr_in *pSadrIn = (struct sockaddr_in *)ai->ai_addr;
(void)pSadrIn;
debug(D_CONNECT_TO, "ai_addr = sin_family: %d (AF_INET = %d, AF_INET6 = %d), sin_addr: '%s', sin_port: '%s'",
pSadrIn->sin_family,
AF_INET,
AF_INET6,
hostBfr,
servBfr);
break;
}
case PF_INET6: {
struct sockaddr_in6 *pSadrIn6 = (struct sockaddr_in6 *) ai->ai_addr;
(void)pSadrIn6;
debug(D_CONNECT_TO,"ai_addr = sin6_family: %d (AF_INET = %d, AF_INET6 = %d), sin6_addr: '%s', sin6_port: '%s', sin6_flowinfo: %u, sin6_scope_id: %u",
pSadrIn6->sin6_family,
AF_INET,
AF_INET6,
hostBfr,
servBfr,
pSadrIn6->sin6_flowinfo,
pSadrIn6->sin6_scope_id);
break;
}
default: {
debug(D_CONNECT_TO, "Unknown protocol family %d.", ai->ai_family);
continue;
}
}
fd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if(fd != -1) {
if(timeout) {
if(setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (char *) timeout, sizeof(struct timeval)) < 0)
error("Failed to set timeout on the socket to ip '%s' port '%s'", hostBfr, servBfr);
}
errno = 0;
if(connect(fd, ai->ai_addr, ai->ai_addrlen) < 0) {
if(errno == EALREADY || errno == EINPROGRESS) {
info("Waiting for connection to ip %s port %s to be established", hostBfr, servBfr);
fd_set fds;
FD_ZERO(&fds);
FD_SET(0, &fds);
int rc = select (1, NULL, &fds, NULL, timeout);
if(rc > 0 && FD_ISSET(fd, &fds)) {
info("connect() to ip %s port %s completed successfully", hostBfr, servBfr);
}
else if(rc == -1) {
error("Failed to connect to '%s', port '%s'. select() returned %d", hostBfr, servBfr, rc);
close(fd);
fd = -1;
}
else {
error("Timed out while connecting to '%s', port '%s'. select() returned %d", hostBfr, servBfr, rc);
close(fd);
fd = -1;
}
}
else {
error("Failed to connect to '%s', port '%s'", hostBfr, servBfr);
close(fd);
fd = -1;
}
}
if(fd != -1)
debug(D_CONNECT_TO, "Connected to '%s' on port '%s'.", hostBfr, servBfr);
}
}
freeaddrinfo(ai_head);
return fd;
}
// connect_to_this()
//
// definition format:
//
// [PROTOCOL:]IP[%INTERFACE][:PORT]
//
// PROTOCOL = tcp or udp
// IP = IPv4 or IPv6 IP or hostname, optionally enclosed in [] (required for IPv6)
// INTERFACE = for IPv6 only, the network interface to use
// PORT = port number or service name
int connect_to_this(const char *definition, int default_port, struct timeval *timeout) {
char buffer[strlen(definition) + 1];
strcpy(buffer, definition);
char default_service[10 + 1];
snprintfz(default_service, 10, "%d", default_port);
char *host = buffer, *service = default_service, *interface = "";
int protocol = IPPROTO_TCP, socktype = SOCK_STREAM;
uint32_t scope_id = 0;
if(strncmp(host, "tcp:", 4) == 0) {
host += 4;
protocol = IPPROTO_TCP;
socktype = SOCK_STREAM;
}
else if(strncmp(host, "udp:", 4) == 0) {
host += 4;
protocol = IPPROTO_UDP;
socktype = SOCK_DGRAM;
}
else if(strncmp(host, "unix:", 5) == 0) {
char *path = host + 5;
return connect_to_unix(path, timeout);
}
char *e = host;
if(*e == '[') {
e = ++host;
while(*e && *e != ']') e++;
if(*e == ']') {
*e = '\0';
e++;
}
}
else {
while(*e && *e != ':' && *e != '%') e++;
}
if(*e == '%') {
*e = '\0';
e++;
interface = e;
while(*e && *e != ':') e++;
}
if(*e == ':') {
*e = '\0';
e++;
service = e;
}
debug(D_CONNECT_TO, "Attempting connection to host = '%s', service = '%s', interface = '%s', protocol = %d (tcp = %d, udp = %d)", host, service, interface, protocol, IPPROTO_TCP, IPPROTO_UDP);
if(!*host) {
error("Definition '%s' does not specify a host.", definition);
return -1;
}
if(*interface) {
scope_id = if_nametoindex(interface);
if(!scope_id)
error("Cannot find a network interface named '%s'. Continuing with limiting the network interface", interface);
}
if(!*service)
service = default_service;
return connect_to_this_ip46(protocol, socktype, host, scope_id, service, timeout);
}
int connect_to_one_of(const char *destination, int default_port, struct timeval *timeout, size_t *reconnects_counter, char *connected_to, size_t connected_to_size) {
int sock = -1;
const char *s = destination;
while(*s) {
const char *e = s;
// skip separators, moving both s(tart) and e(nd)
while(isspace(*e) || *e == ',') s = ++e;
// move e(nd) to the first separator
while(*e && !isspace(*e) && *e != ',') e++;
// is there anything?
if(!*s || s == e) break;
char buf[e - s + 1];
strncpyz(buf, s, e - s);
if(reconnects_counter) *reconnects_counter += 1;
sock = connect_to_this(buf, default_port, timeout);
if(sock != -1) {
if(connected_to && connected_to_size) {
strncpy(connected_to, buf, connected_to_size);
connected_to[connected_to_size - 1] = '\0';
}
break;
}
s = e;
}
return sock;
}
// --------------------------------------------------------------------------------------------------------------------
// helpers to send/receive data in one call, in blocking mode, with a timeout
ssize_t recv_timeout(int sockfd, void *buf, size_t len, int flags, int timeout) {
for(;;) {
struct pollfd fd = {
.fd = sockfd,
.events = POLLIN,
.revents = 0
};
errno = 0;
int retval = poll(&fd, 1, timeout * 1000);
if(retval == -1) {
// failed
if(errno == EINTR || errno == EAGAIN)
continue;
return -1;
}
if(!retval) {
// timeout
return 0;
}
if(fd.events & POLLIN) break;
}
return recv(sockfd, buf, len, flags);
}
ssize_t send_timeout(int sockfd, void *buf, size_t len, int flags, int timeout) {
for(;;) {
struct pollfd fd = {
.fd = sockfd,
.events = POLLOUT,
.revents = 0
};
errno = 0;
int retval = poll(&fd, 1, timeout * 1000);
if(retval == -1) {
// failed
if(errno == EINTR || errno == EAGAIN)
continue;
return -1;
}
if(!retval) {
// timeout
return 0;
}
if(fd.events & POLLOUT) break;
}
return send(sockfd, buf, len, flags);
}
// --------------------------------------------------------------------------------------------------------------------
// accept4() replacement for systems that do not have one
#ifndef HAVE_ACCEPT4
int accept4(int sock, struct sockaddr *addr, socklen_t *addrlen, int flags) {
int fd = accept(sock, addr, addrlen);
int newflags = 0;
if (fd < 0) return fd;
if (flags & SOCK_NONBLOCK) {
newflags |= O_NONBLOCK;
flags &= ~SOCK_NONBLOCK;
}
#ifdef SOCK_CLOEXEC
#ifdef O_CLOEXEC
if (flags & SOCK_CLOEXEC) {
newflags |= O_CLOEXEC;
flags &= ~SOCK_CLOEXEC;
}
#endif
#endif
if (flags) {
close(fd);
errno = EINVAL;
return -1;
}
if (fcntl(fd, F_SETFL, newflags) < 0) {
int saved_errno = errno;
close(fd);
errno = saved_errno;
return -1;
}
return fd;
}
#endif
// --------------------------------------------------------------------------------------------------------------------
// accept_socket() - accept a socket and store client IP and port
int accept_socket(int fd, int flags, char *client_ip, size_t ipsize, char *client_port, size_t portsize, SIMPLE_PATTERN *access_list) {
struct sockaddr_storage sadr;
socklen_t addrlen = sizeof(sadr);
int nfd = accept4(fd, (struct sockaddr *)&sadr, &addrlen, flags);
if (likely(nfd >= 0)) {
if (getnameinfo((struct sockaddr *)&sadr, addrlen, client_ip, (socklen_t)ipsize, client_port, (socklen_t)portsize, NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
error("LISTENER: cannot getnameinfo() on received client connection.");
strncpyz(client_ip, "UNKNOWN", ipsize - 1);
strncpyz(client_port, "UNKNOWN", portsize - 1);
}
client_ip[ipsize - 1] = '\0';
client_port[portsize - 1] = '\0';
switch (((struct sockaddr *)&sadr)->sa_family) {
case AF_UNIX:
debug(D_LISTENER, "New UNIX domain web client from %s on socket %d.", client_ip, fd);
// set the port - certain versions of libc return garbage on unix sockets
strncpy(client_port, "UNIX", portsize);
client_port[portsize - 1] = '\0';
break;
case AF_INET:
debug(D_LISTENER, "New IPv4 web client from %s port %s on socket %d.", client_ip, client_port, fd);
break;
case AF_INET6:
if (strncmp(client_ip, "::ffff:", 7) == 0) {
memmove(client_ip, &client_ip[7], strlen(&client_ip[7]) + 1);
debug(D_LISTENER, "New IPv4 web client from %s port %s on socket %d.", client_ip, client_port, fd);
}
else
debug(D_LISTENER, "New IPv6 web client from %s port %s on socket %d.", client_ip, client_port, fd);
break;
default:
debug(D_LISTENER, "New UNKNOWN web client from %s port %s on socket %d.", client_ip, client_port, fd);
break;
}
if(access_list) {
if(!strcmp(client_ip, "127.0.0.1") || !strcmp(client_ip, "::1")) {
strncpy(client_ip, "localhost", ipsize);
client_ip[ipsize - 1] = '\0';
}
if(unlikely(!simple_pattern_matches(access_list, client_ip))) {
errno = 0;
debug(D_LISTENER, "Permission denied for client '%s', port '%s'", client_ip, client_port);
error("DENIED ACCESS to client '%s'", client_ip);
close(nfd);
nfd = -1;
errno = EPERM;
}
}
}
#ifdef HAVE_ACCEPT4
else if(errno == ENOSYS)
error("netdata has been compiled with the assumption that the system has the accept4() call, but it is not here. Recompile netdata like this: ./configure --disable-accept4 ...");
#endif
return nfd;
}
// --------------------------------------------------------------------------------------------------------------------
// poll() based listener
// this should be the fastest possible listener for up to 100 sockets
// above 100, an epoll() interface is needed on Linux
#define POLL_FDS_INCREASE_STEP 10
inline POLLINFO *poll_add_fd(POLLJOB *p
, int fd
, int socktype
, WEB_CLIENT_ACL port_acl
, uint32_t flags
, const char *client_ip
, const char *client_port
, void *(*add_callback)(POLLINFO * /*pi*/, short int * /*events*/, void * /*data*/)
, void (*del_callback)(POLLINFO * /*pi*/)
, int (*rcv_callback)(POLLINFO * /*pi*/, short int * /*events*/)
, int (*snd_callback)(POLLINFO * /*pi*/, short int * /*events*/)
, void *data
) {
debug(D_POLLFD, "POLLFD: ADD: request to add fd %d, slots = %zu, used = %zu, min = %zu, max = %zu, next free = %zd", fd, p->slots, p->used, p->min, p->max, p->first_free?(ssize_t)p->first_free->slot:(ssize_t)-1);
if(unlikely(fd < 0)) return NULL;
//if(p->limit && p->used >= p->limit) {
// info("Max sockets limit reached (%zu sockets), dropping connection", p->used);
// close(fd);
// return NULL;
//}
if(unlikely(!p->first_free)) {
size_t new_slots = p->slots + POLL_FDS_INCREASE_STEP;
debug(D_POLLFD, "POLLFD: ADD: increasing size (current = %zu, new = %zu, used = %zu, min = %zu, max = %zu)", p->slots, new_slots, p->used, p->min, p->max);
p->fds = reallocz(p->fds, sizeof(struct pollfd) * new_slots);
p->inf = reallocz(p->inf, sizeof(POLLINFO) * new_slots);
// reset all the newly added slots
ssize_t i;
for(i = new_slots - 1; i >= (ssize_t)p->slots ; i--) {
debug(D_POLLFD, "POLLFD: ADD: resetting new slot %zd", i);
p->fds[i].fd = -1;
p->fds[i].events = 0;
p->fds[i].revents = 0;
p->inf[i].p = p;
p->inf[i].slot = (size_t)i;
p->inf[i].flags = 0;
p->inf[i].socktype = -1;
p->inf[i].port_acl = -1;
p->inf[i].client_ip = NULL;
p->inf[i].client_port = NULL;
p->inf[i].del_callback = p->del_callback;
p->inf[i].rcv_callback = p->rcv_callback;
p->inf[i].snd_callback = p->snd_callback;
p->inf[i].data = NULL;
// link them so that the first free will be earlier in the array
// (we loop decrementing i)
p->inf[i].next = p->first_free;
p->first_free = &p->inf[i];
}
p->slots = new_slots;
}
POLLINFO *pi = p->first_free;
p->first_free = p->first_free->next;
debug(D_POLLFD, "POLLFD: ADD: selected slot %zu, next free is %zd", pi->slot, p->first_free?(ssize_t)p->first_free->slot:(ssize_t)-1);
struct pollfd *pf = &p->fds[pi->slot];
pf->fd = fd;
pf->events = POLLIN;
pf->revents = 0;
pi->fd = fd;
pi->p = p;
pi->socktype = socktype;
pi->port_acl = port_acl;
pi->flags = flags;
pi->next = NULL;
pi->client_ip = strdupz(client_ip);
pi->client_port = strdupz(client_port);
pi->del_callback = del_callback;
pi->rcv_callback = rcv_callback;
pi->snd_callback = snd_callback;
pi->connected_t = now_boottime_sec();
pi->last_received_t = 0;
pi->last_sent_t = 0;
pi->last_sent_t = 0;
pi->recv_count = 0;
pi->send_count = 0;
netdata_thread_disable_cancelability();
p->used++;
if(unlikely(pi->slot > p->max))
p->max = pi->slot;
if(pi->flags & POLLINFO_FLAG_CLIENT_SOCKET) {
pi->data = add_callback(pi, &pf->events, data);
}
if(pi->flags & POLLINFO_FLAG_SERVER_SOCKET) {
p->min = pi->slot;
}
netdata_thread_enable_cancelability();
debug(D_POLLFD, "POLLFD: ADD: completed, slots = %zu, used = %zu, min = %zu, max = %zu, next free = %zd", p->slots, p->used, p->min, p->max, p->first_free?(ssize_t)p->first_free->slot:(ssize_t)-1);
return pi;
}
inline void poll_close_fd(POLLINFO *pi) {
POLLJOB *p = pi->p;
struct pollfd *pf = &p->fds[pi->slot];
debug(D_POLLFD, "POLLFD: DEL: request to clear slot %zu (fd %d), old next free was %zd", pi->slot, pf->fd, p->first_free?(ssize_t)p->first_free->slot:(ssize_t)-1);
if(unlikely(pf->fd == -1)) return;
netdata_thread_disable_cancelability();
if(pi->flags & POLLINFO_FLAG_CLIENT_SOCKET) {
pi->del_callback(pi);
if(likely(!(pi->flags & POLLINFO_FLAG_DONT_CLOSE))) {
if(close(pf->fd) == -1)
error("Failed to close() poll_events() socket %d", pf->fd);
}
}
pf->fd = -1;
pf->events = 0;
pf->revents = 0;
pi->fd = -1;
pi->socktype = -1;
pi->flags = 0;
pi->data = NULL;
pi->del_callback = NULL;
pi->rcv_callback = NULL;
pi->snd_callback = NULL;
freez(pi->client_ip);
pi->client_ip = NULL;
freez(pi->client_port);
pi->client_port = NULL;
pi->next = p->first_free;
p->first_free = pi;
p->used--;
if(unlikely(p->max == pi->slot)) {
p->max = p->min;
ssize_t i;
for(i = (ssize_t)pi->slot; i > (ssize_t)p->min ;i--) {
if (unlikely(p->fds[i].fd != -1)) {
p->max = (size_t)i;
break;
}
}
}
netdata_thread_enable_cancelability();
debug(D_POLLFD, "POLLFD: DEL: completed, slots = %zu, used = %zu, min = %zu, max = %zu, next free = %zd", p->slots, p->used, p->min, p->max, p->first_free?(ssize_t)p->first_free->slot:(ssize_t)-1);
}
void *poll_default_add_callback(POLLINFO *pi, short int *events, void *data) {
(void)pi;
(void)events;
(void)data;
// error("POLLFD: internal error: poll_default_add_callback() called");
return NULL;
}
void poll_default_del_callback(POLLINFO *pi) {
if(pi->data)
error("POLLFD: internal error: del_callback_default() called with data pointer - possible memory leak");
}
int poll_default_rcv_callback(POLLINFO *pi, short int *events) {
*events |= POLLIN;
char buffer[1024 + 1];
ssize_t rc;
do {
rc = recv(pi->fd, buffer, 1024, MSG_DONTWAIT);
if (rc < 0) {
// read failed
if (errno != EWOULDBLOCK && errno != EAGAIN) {
error("POLLFD: poll_default_rcv_callback(): recv() failed with %zd.", rc);
return -1;
}
} else if (rc) {
// data received
info("POLLFD: internal error: poll_default_rcv_callback() is discarding %zd bytes received on socket %d", rc, pi->fd);
}
} while (rc != -1);
return 0;
}
int poll_default_snd_callback(POLLINFO *pi, short int *events) {
*events &= ~POLLOUT;
info("POLLFD: internal error: poll_default_snd_callback(): nothing to send on socket %d", pi->fd);
return 0;
}
void poll_default_tmr_callback(void *timer_data) {
(void)timer_data;
}
static void poll_events_cleanup(void *data) {
POLLJOB *p = (POLLJOB *)data;
size_t i;
for(i = 0 ; i <= p->max ; i++) {
POLLINFO *pi = &p->inf[i];
poll_close_fd(pi);
}
freez(p->fds);
freez(p->inf);
}
static void poll_events_process(POLLJOB *p, POLLINFO *pi, struct pollfd *pf, short int revents, time_t now) {
short int events = pf->events;
int fd = pf->fd;
pf->revents = 0;
size_t i = pi->slot;
if(unlikely(fd == -1)) {
debug(D_POLLFD, "POLLFD: LISTENER: ignoring slot %zu, it does not have an fd", i);
return;
}
debug(D_POLLFD, "POLLFD: LISTENER: processing events for slot %zu (events = %d, revents = %d)", i, events, revents);
if(revents & POLLIN || revents & POLLPRI) {
// receiving data
pi->last_received_t = now;
pi->recv_count++;
if(likely(pi->flags & POLLINFO_FLAG_CLIENT_SOCKET)) {
// read data from client TCP socket
debug(D_POLLFD, "POLLFD: LISTENER: reading data from TCP client slot %zu (fd %d)", i, fd);
pf->events = 0;
if (pi->rcv_callback(pi, &pf->events) == -1) {
poll_close_fd(&p->inf[i]);
return;
}
pf = &p->fds[i];
pi = &p->inf[i];
#ifdef NETDATA_INTERNAL_CHECKS
// this is common - it is used for web server file copies
if(unlikely(!(pf->events & (POLLIN|POLLOUT)))) {
error("POLLFD: LISTENER: after reading, client slot %zu (fd %d) from %s port %s was left without expecting input or output. ", i, fd, pi->client_ip?pi->client_ip:"<undefined-ip>", pi->client_port?pi->client_port:"<undefined-port>");
//poll_close_fd(pi);
//return;
}
#endif
}
else if(likely(pi->flags & POLLINFO_FLAG_SERVER_SOCKET)) {
// new connection
// debug(D_POLLFD, "POLLFD: LISTENER: accepting connections from slot %zu (fd %d)", i, fd);
switch(pi->socktype) {
case SOCK_STREAM: {
// a TCP socket
// we accept the connection
int nfd;
do {
char client_ip[NI_MAXHOST + 1];
char client_port[NI_MAXSERV + 1];
debug(D_POLLFD, "POLLFD: LISTENER: calling accept4() slot %zu (fd %d)", i, fd);
nfd = accept_socket(fd, SOCK_NONBLOCK, client_ip, NI_MAXHOST + 1, client_port, NI_MAXSERV + 1, p->access_list);
if (unlikely(nfd < 0)) {
// accept failed
debug(D_POLLFD, "POLLFD: LISTENER: accept4() slot %zu (fd %d) failed.", i, fd);
if(unlikely(errno == EMFILE)) {
error("POLLFD: LISTENER: too many open files - sleeping for 1ms - used by this thread %zu, max for this thread %zu", p->used, p->limit);
usleep(1000); // 10ms
}
else if(unlikely(errno != EWOULDBLOCK && errno != EAGAIN))
error("POLLFD: LISTENER: accept() failed.");
break;
}
else {
// accept ok
// info("POLLFD: LISTENER: client '[%s]:%s' connected to '%s' on fd %d", client_ip, client_port, sockets->fds_names[i], nfd);
poll_add_fd(p
, nfd
, SOCK_STREAM
, pi->port_acl
, POLLINFO_FLAG_CLIENT_SOCKET
, client_ip
, client_port
, p->add_callback
, p->del_callback
, p->rcv_callback
, p->snd_callback
, NULL
);
// it may have reallocated them, so refresh our pointers
pf = &p->fds[i];
pi = &p->inf[i];
}
} while (nfd >= 0 && (!p->limit || p->used < p->limit));
break;
}
case SOCK_DGRAM: {
// a UDP socket
// we read data from the server socket
debug(D_POLLFD, "POLLFD: LISTENER: reading data from UDP slot %zu (fd %d)", i, fd);
// TODO: access_list is not applied to UDP
// but checking the access list on every UDP packet will destroy
// performance, especially for statsd.
pf->events = 0;
pi->rcv_callback(pi, &pf->events);
break;
}
default: {
error("POLLFD: LISTENER: Unknown socktype %d on slot %zu", pi->socktype, pi->slot);
break;
}
}
}
}
if(unlikely(revents & POLLOUT)) {
// sending data
debug(D_POLLFD, "POLLFD: LISTENER: sending data to socket on slot %zu (fd %d)", i, fd);
pi->last_sent_t = now;
pi->send_count++;
pf->events = 0;
if (pi->snd_callback(pi, &pf->events) == -1) {
poll_close_fd(&p->inf[i]);
return;
}
pf = &p->fds[i];
pi = &p->inf[i];
#ifdef NETDATA_INTERNAL_CHECKS
// this is common - it is used for streaming
if(unlikely(pi->flags & POLLINFO_FLAG_CLIENT_SOCKET && !(pf->events & (POLLIN|POLLOUT)))) {
error("POLLFD: LISTENER: after sending, client slot %zu (fd %d) from %s port %s was left without expecting input or output. ", i, fd, pi->client_ip?pi->client_ip:"<undefined-ip>", pi->client_port?pi->client_port:"<undefined-port>");
//poll_close_fd(pi);
//return;
}
#endif
}
if(unlikely(revents & POLLERR)) {
error("POLLFD: LISTENER: processing POLLERR events for slot %zu fd %d (events = %d, revents = %d)", i, events, revents, fd);
pf->events = 0;
poll_close_fd(pi);
return;
}
if(unlikely(revents & POLLHUP)) {
error("POLLFD: LISTENER: processing POLLHUP events for slot %zu fd %d (events = %d, revents = %d)", i, events, revents, fd);
pf->events = 0;
poll_close_fd(pi);
return;
}
if(unlikely(revents & POLLNVAL)) {
error("POLLFD: LISTENER: processing POLLNVAL events for slot %zu fd %d (events = %d, revents = %d)", i, events, revents, fd);
pf->events = 0;
poll_close_fd(pi);
return;
}
}
void poll_events(LISTEN_SOCKETS *sockets
, void *(*add_callback)(POLLINFO * /*pi*/, short int * /*events*/, void * /*data*/)
, void (*del_callback)(POLLINFO * /*pi*/)
, int (*rcv_callback)(POLLINFO * /*pi*/, short int * /*events*/)
, int (*snd_callback)(POLLINFO * /*pi*/, short int * /*events*/)
, void (*tmr_callback)(void * /*timer_data*/)
, SIMPLE_PATTERN *access_list
, void *data
, time_t tcp_request_timeout_seconds
, time_t tcp_idle_timeout_seconds
, time_t timer_milliseconds
, void *timer_data
, size_t max_tcp_sockets
) {
if(!sockets || !sockets->opened) {
error("POLLFD: internal error: no listening sockets are opened");
return;
}
if(timer_milliseconds <= 0) timer_milliseconds = 0;
int retval;
POLLJOB p = {
.slots = 0,
.used = 0,
.max = 0,
.limit = max_tcp_sockets,
.fds = NULL,
.inf = NULL,
.first_free = NULL,
.complete_request_timeout = tcp_request_timeout_seconds,
.idle_timeout = tcp_idle_timeout_seconds,
.checks_every = (tcp_idle_timeout_seconds / 3) + 1,
.access_list = access_list,
.timer_milliseconds = timer_milliseconds,
.timer_data = timer_data,
.add_callback = add_callback?add_callback:poll_default_add_callback,
.del_callback = del_callback?del_callback:poll_default_del_callback,
.rcv_callback = rcv_callback?rcv_callback:poll_default_rcv_callback,
.snd_callback = snd_callback?snd_callback:poll_default_snd_callback,
.tmr_callback = tmr_callback?tmr_callback:poll_default_tmr_callback
};
size_t i;
for(i = 0; i < sockets->opened ;i++) {
POLLINFO *pi = poll_add_fd(&p
, sockets->fds[i]
, sockets->fds_types[i]
, sockets->fds_acl_flags[i]
, POLLINFO_FLAG_SERVER_SOCKET
, (sockets->fds_names[i])?sockets->fds_names[i]:"UNKNOWN"
, ""
, p.add_callback
, p.del_callback
, p.rcv_callback
, p.snd_callback
, NULL
);
pi->data = data;
info("POLLFD: LISTENER: listening on '%s'", (sockets->fds_names[i])?sockets->fds_names[i]:"UNKNOWN");
}
int listen_sockets_active = 1;
int timeout_ms = 1000; // in milliseconds
time_t last_check = now_boottime_sec();
usec_t timer_usec = timer_milliseconds * USEC_PER_MS;
usec_t now_usec = 0, next_timer_usec = 0, last_timer_usec = 0;
(void)last_timer_usec;
if(unlikely(timer_usec)) {
now_usec = now_boottime_usec();
next_timer_usec = now_usec - (now_usec % timer_usec) + timer_usec;
}
netdata_thread_cleanup_push(poll_events_cleanup, &p);
while(!netdata_exit) {
if(unlikely(timer_usec)) {
now_usec = now_boottime_usec();
if(unlikely(timer_usec && now_usec >= next_timer_usec)) {
debug(D_POLLFD, "Calling timer callback after %zu usec", (size_t)(now_usec - last_timer_usec));
last_timer_usec = now_usec;
p.tmr_callback(p.timer_data);
now_usec = now_boottime_usec();
next_timer_usec = now_usec - (now_usec % timer_usec) + timer_usec;
}
usec_t dt_usec = next_timer_usec - now_usec;
if(dt_usec < 1000 * USEC_PER_MS)
timeout_ms = 1000;
else
timeout_ms = (int)(dt_usec / USEC_PER_MS);
}
// enable or disable the TCP listening sockets, based on the current number of sockets used and the limit set
if((listen_sockets_active && (p.limit && p.used >= p.limit)) || (!listen_sockets_active && (!p.limit || p.used < p.limit))) {
listen_sockets_active = !listen_sockets_active;
info("%s listening sockets (used TCP sockets %zu, max allowed for this worker %zu)", (listen_sockets_active)?"ENABLING":"DISABLING", p.used, p.limit);
for (i = 0; i <= p.max; i++) {
if(p.inf[i].flags & POLLINFO_FLAG_SERVER_SOCKET && p.inf[i].socktype == SOCK_STREAM) {
p.fds[i].events = (short int) ((listen_sockets_active) ? POLLIN : 0);
}
}
}
debug(D_POLLFD, "POLLFD: LISTENER: Waiting on %zu sockets for %zu ms...", p.max + 1, (size_t)timeout_ms);
retval = poll(p.fds, p.max + 1, timeout_ms);
time_t now = now_boottime_sec();
if(unlikely(retval == -1)) {
error("POLLFD: LISTENER: poll() failed while waiting on %zu sockets.", p.max + 1);
break;
}
else if(unlikely(!retval)) {
debug(D_POLLFD, "POLLFD: LISTENER: poll() timeout.");
}
else {
for (i = 0; i <= p.max; i++) {
struct pollfd *pf = &p.fds[i];
short int revents = pf->revents;
if (unlikely(revents))
poll_events_process(&p, &p.inf[i], pf, revents, now);
}
}
if(unlikely(p.checks_every > 0 && now - last_check > p.checks_every)) {
last_check = now;
// security checks
for(i = 0; i <= p.max; i++) {
POLLINFO *pi = &p.inf[i];
if(likely(pi->flags & POLLINFO_FLAG_CLIENT_SOCKET)) {
if (unlikely(pi->send_count == 0 && p.complete_request_timeout > 0 && (now - pi->connected_t) >= p.complete_request_timeout)) {
info("POLLFD: LISTENER: client slot %zu (fd %d) from %s port %s has not sent a complete request in %zu seconds - closing it. "
, i
, pi->fd
, pi->client_ip ? pi->client_ip : "<undefined-ip>"
, pi->client_port ? pi->client_port : "<undefined-port>"
, (size_t) p.complete_request_timeout
);
poll_close_fd(pi);
}
else if(unlikely(pi->recv_count && p.idle_timeout > 0 && now - ((pi->last_received_t > pi->last_sent_t) ? pi->last_received_t : pi->last_sent_t) >= p.idle_timeout )) {
info("POLLFD: LISTENER: client slot %zu (fd %d) from %s port %s is idle for more than %zu seconds - closing it. "
, i
, pi->fd
, pi->client_ip ? pi->client_ip : "<undefined-ip>"
, pi->client_port ? pi->client_port : "<undefined-port>"
, (size_t) p.idle_timeout
);
poll_close_fd(pi);
}
}
}
}
}
netdata_thread_cleanup_pop(1);
debug(D_POLLFD, "POLLFD: LISTENER: cleanup completed");
}
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