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authorLennart Weller <lhw@ring0.de>2017-01-24 15:21:09 +0000
committerLennart Weller <lhw@ring0.de>2017-01-24 15:21:09 +0000
commit3ed3b02ed96ddab1c084811f3579b3a2aec83e04 (patch)
tree7a61ab288ae47800c4f11be5677d6ad8288dcd98 /src/socket.c
parentNew upstream version 1.4.0+dfsg (diff)
downloadnetdata-3ed3b02ed96ddab1c084811f3579b3a2aec83e04.tar.xz
netdata-3ed3b02ed96ddab1c084811f3579b3a2aec83e04.zip
New upstream version 1.5.0+dfsgupstream/1.5.0+dfsg
Diffstat (limited to 'src/socket.c')
-rw-r--r--src/socket.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/src/socket.c b/src/socket.c
new file mode 100644
index 000000000..643811e44
--- /dev/null
+++ b/src/socket.c
@@ -0,0 +1,179 @@
+#include "common.h"
+
+// connect_to()
+//
+// 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(const char *definition, int default_port, struct timeval *timeout) {
+ struct addrinfo hints;
+ struct addrinfo *ai_head = NULL, *ai = NULL;
+
+ 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;
+ }
+
+ 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;
+
+ 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;
+ 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;
+ 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(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);
+
+ if(connect(fd, ai->ai_addr, ai->ai_addrlen) < 0) {
+ error("Failed to connect to '%s', port '%s'", hostBfr, servBfr);
+ close(fd);
+ fd = -1;
+ }
+
+ debug(D_CONNECT_TO, "Connected to '%s' on port '%s'.", hostBfr, servBfr);
+ }
+ }
+
+ freeaddrinfo(ai_head);
+
+ return fd;
+}