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#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;
}
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