/* $Id: connecthostport.c,v 1.15 2015/10/09 16:26:19 nanard Exp $ */
/* Project : miniupnp
* Author : Thomas Bernard
* Copyright (c) 2010-2017 Thomas Bernard
* This software is subject to the conditions detailed in the
* LICENCE file provided in this distribution. */
/* use getaddrinfo() or gethostbyname()
* uncomment the following line in order to use gethostbyname() */
#ifdef NO_GETADDRINFO
#define USE_GETHOSTBYNAME
#endif
#include <string.h>
#include <stdio.h>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#include <io.h>
#define MAXHOSTNAMELEN 64
#define snprintf _snprintf
#define herror
#define socklen_t int
#else /* #ifdef _WIN32 */
#include <unistd.h>
#include <sys/types.h>
#ifdef MINIUPNPC_SET_SOCKET_TIMEOUT
#include <sys/time.h>
#endif /* #ifdef MINIUPNPC_SET_SOCKET_TIMEOUT */
#include <sys/param.h>
#include <sys/select.h>
#include <errno.h>
#define closesocket close
#include <netdb.h>
#include <netinet/in.h>
/* defining MINIUPNPC_IGNORE_EINTR enable the ignore of interruptions
* during the connect() call */
#define MINIUPNPC_IGNORE_EINTR
#include <sys/socket.h>
#include <sys/select.h>
#endif /* #else _WIN32 */
/* definition of PRINT_SOCKET_ERROR */
#ifdef _WIN32
#define PRINT_SOCKET_ERROR(x) fprintf(stderr, "Socket error: %s, %d\n", x, WSAGetLastError());
#else
#define PRINT_SOCKET_ERROR(x) perror(x)
#endif
#if defined(__amigaos__) || defined(__amigaos4__)
#define herror(A) printf("%s\n", A)
#endif
#include "connecthostport.h"
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif
/* connecthostport()
* return a socket connected (TCP) to the host and port
* or -1 in case of error */
int connecthostport(const char * host, unsigned short port,
unsigned int scope_id)
{
int s, n;
#ifdef USE_GETHOSTBYNAME
struct sockaddr_in dest;
struct hostent *hp;
#else /* #ifdef USE_GETHOSTBYNAME */
char tmp_host[MAXHOSTNAMELEN+1];
char port_str[8];
struct addrinfo *ai, *p;
struct addrinfo hints;
#endif /* #ifdef USE_GETHOSTBYNAME */
#ifdef MINIUPNPC_SET_SOCKET_TIMEOUT
struct timeval timeout;
#endif /* #ifdef MINIUPNPC_SET_SOCKET_TIMEOUT */
#ifdef USE_GETHOSTBYNAME
hp = gethostbyname(host);
if(hp == NULL)
{
herror(host);
return -1;
}
memcpy(&dest.sin_addr, hp->h_addr, sizeof(dest.sin_addr));
memset(dest.sin_zero, 0, sizeof(dest.sin_zero));
s = socket(PF_INET, SOCK_STREAM, 0);
if(s < 0)
{
PRINT_SOCKET_ERROR("socket");
return -1;
}
#ifdef MINIUPNPC_SET_SOCKET_TIMEOUT
/* setting a 3 seconds timeout for the connect() call */
timeout.tv_sec = 3;
timeout.tv_usec = 0;
if(setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(struct timeval)) < 0)
{
PRINT_SOCKET_ERROR("setsockopt SO_RCVTIMEO");
}
timeout.tv_sec = 3;
timeout.tv_usec = 0;
if(setsockopt(s, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(struct timeval)) < 0)
{
PRINT_SOCKET_ERROR("setsockopt SO_SNDTIMEO");
}
#endif /* #ifdef MINIUPNPC_SET_SOCKET_TIMEOUT */
dest.sin_family = AF_INET;
dest.sin_port = htons(port);
n = connect(s, (struct sockaddr *)&dest, sizeof(struct sockaddr_in));
#ifdef MINIUPNPC_IGNORE_EINTR
/* EINTR The system call was interrupted by a signal that was caught
* EINPROGRESS The socket is nonblocking and the connection cannot
* be completed immediately. */
while(n < 0 && (errno == EINTR || errno == EINPROGRESS))
{
socklen_t len;
fd_set wset;
int err;
FD_ZERO(&wset);
FD_SET(s, &wset);
if((n = select(s + 1, NULL, &wset, NULL, NULL)) == -1 && errno == EINTR)
continue;
/*len = 0;*/
/*n = getpeername(s, NULL, &len);*/
len = sizeof(err);
if(getsockopt(s, SOL_SOCKET, SO_ERROR, &err, &len) < 0) {
PRINT_SOCKET_ERROR("getsockopt");
closesocket(s);
return -1;
}
if(err != 0) {
errno = err;
n = -1;
}
}
#endif /* #ifdef MINIUPNPC_IGNORE_EINTR */
if(n<0)
{
PRINT_SOCKET_ERROR("connect");
closesocket(s);
return -1;
}
#else /* #ifdef USE_GETHOSTBYNAME */
/* use getaddrinfo() instead of gethostbyname() */
memset(&hints, 0, sizeof(hints));
/* hints.ai_flags = AI_ADDRCONFIG; */
#ifdef AI_NUMERICSERV
hints.ai_flags = AI_NUMERICSERV;
#endif
hints.ai_socktype = SOCK_STREAM;
hints.ai_family = AF_UNSPEC; /* AF_INET, AF_INET6 or AF_UNSPEC */
/* hints.ai_protocol = IPPROTO_TCP; */
snprintf(port_str, sizeof(port_str), "%hu", port);
if(host[0] == '[')
{
/* literal ip v6 address */
int i, j;
for(i = 0, j = 1; host[j] && (host[j] != ']') && i < MAXHOSTNAMELEN; i++, j++)
{
tmp_host[i] = host[j];
if(0 == memcmp(host+j, "%25", 3)) /* %25 is just url encoding for '%' */
j+=2; /* skip "25" */
}
tmp_host[i] = '\0';
}
else
{
strncpy(tmp_host, host, MAXHOSTNAMELEN);
}
tmp_host[MAXHOSTNAMELEN] = '\0';
n = getaddrinfo(tmp_host, port_str, &hints, &ai);
if(n != 0)
{
#ifdef _WIN32
fprintf(stderr, "getaddrinfo() error : %d\n", n);
#else
fprintf(stderr, "getaddrinfo() error : %s\n", gai_strerror(n));
#endif
return -1;
}
s = -1;
for(p = ai; p; p = p->ai_next)
{
s = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
if(s < 0)
continue;
if(p->ai_addr->sa_family == AF_INET6 && scope_id > 0) {
struct sockaddr_in6 * addr6 = (struct sockaddr_in6 *)p->ai_addr;
addr6->sin6_scope_id = scope_id;
}
#ifdef MINIUPNPC_SET_SOCKET_TIMEOUT
/* setting a 3 seconds timeout for the connect() call */
timeout.tv_sec = 3;
timeout.tv_usec = 0;
if(setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(struct timeval)) < 0)
{
PRINT_SOCKET_ERROR("setsockopt");
}
timeout.tv_sec = 3;
timeout.tv_usec = 0;
if(setsockopt(s, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(struct timeval)) < 0)
{
PRINT_SOCKET_ERROR("setsockopt");
}
#endif /* #ifdef MINIUPNPC_SET_SOCKET_TIMEOUT */
n = connect(s, p->ai_addr, p->ai_addrlen);
#ifdef MINIUPNPC_IGNORE_EINTR
/* EINTR The system call was interrupted by a signal that was caught
* EINPROGRESS The socket is nonblocking and the connection cannot
* be completed immediately. */
while(n < 0 && (errno == EINTR || errno == EINPROGRESS))
{
socklen_t len;
fd_set wset;
int err;
FD_ZERO(&wset);
FD_SET(s, &wset);
if((n = select(s + 1, NULL, &wset, NULL, NULL)) == -1 && errno == EINTR)
continue;
/*len = 0;*/
/*n = getpeername(s, NULL, &len);*/
len = sizeof(err);
if(getsockopt(s, SOL_SOCKET, SO_ERROR, &err, &len) < 0) {
PRINT_SOCKET_ERROR("getsockopt");
closesocket(s);
freeaddrinfo(ai);
return -1;
}
if(err != 0) {
errno = err;
n = -1;
}
}
#endif /* #ifdef MINIUPNPC_IGNORE_EINTR */
if(n < 0)
{
closesocket(s);
continue;
}
else
{
break;
}
}
freeaddrinfo(ai);
if(s < 0)
{
PRINT_SOCKET_ERROR("socket");
return -1;
}
if(n < 0)
{
PRINT_SOCKET_ERROR("connect");
return -1;
}
#endif /* #ifdef USE_GETHOSTBYNAME */
return s;
}
