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/*****************************************************************************
* tcp.c: network socket abstractions
*****************************************************************************
* Copyright (C) 2010-2013 M2X BV
*
* Authors: Jean-Paul Saman <jpsaman@videolan.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#if defined(HAVE_INTTYPES_H)
# include <inttypes.h>
#elif defined(HAVE_STDINT_H)
# include <stdint.h>
#endif
#include <sys/time.h>
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
# include <netinet/in.h>
# include <net/if.h>
# if defined(WIN32)
# include <netinet/if_ether.h>
# endif
# include <netdb.h>
# include <netinet/ip.h>
# include <netinet/udp.h>
# include <arpa/inet.h>
#endif
#ifndef SOCK_CLOEXEC
# include <fcntl.h>
#endif
#include "tcp.h"
#ifdef HAVE_SYS_SOCKET_H
#ifndef SOCK_CLOEXEC
# include <stdbool.h>
static bool set_fdsocketclosexec(int s)
{
int flags = fcntl(s, F_GETFD);
if (flags != -1)
{
if (fcntl(s, F_SETFD, flags | FD_CLOEXEC) != -1)
{
return true;
}
}
perror("tcp socket error");
return false;
}
#endif
int tcp_close(int fd)
{
int result = 0;
result = shutdown(fd, SHUT_RDWR);
if (result < 0)
perror("tcp shutdown error");
return result;
}
int tcp_open(const char *ipaddress, int port)
{
int s_ctl = -1;
int result = -1;
if (!ipaddress) return -1;
/* only support ipv4 */
struct addrinfo hints, *addr;
char *psz_service;
if ((port > 65535) || (port < 0))
{
fprintf(stderr, "tcp error: invalid port %d specified\n", port);
return -1;
}
if (asprintf(&psz_service, "%d", port) < 0)
return -1;
memset (&hints, 0, sizeof (hints));
hints.ai_family = AF_INET; /* use AF_INET6 for ipv6 */
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
hints.ai_flags = AI_CANONNAME | 0;
result = getaddrinfo(ipaddress, psz_service, &hints, &addr);
if (result < 0)
{
fprintf(stderr, "tcp address error: %s\n", gai_strerror(result));
free(psz_service);
return -1;
}
for (struct addrinfo *ptr = addr; ptr != NULL; ptr = ptr->ai_next )
{
int sflags = 0;
#ifdef SOCK_CLOEXEC
sflags = SOCK_CLOEXEC;
#endif
s_ctl = socket(ptr->ai_family, ptr->ai_socktype | sflags, ptr->ai_protocol);
if (s_ctl < 0)
{
perror("tcp socket error");
continue;
}
#ifndef SOCK_CLOEXEC
if (!set_fdsocketclosexec(s_ctl))
{
close(s_ctl);
s_ctl = -1;
continue;
}
#endif
if (setsockopt (s_ctl, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int)) < 0)
perror("tcp setsockopt error");
result = connect( s_ctl, ptr->ai_addr, ptr->ai_addrlen );
if (result < 0)
{
close(s_ctl);
s_ctl = -1;
perror( "tcp connect error" );
continue;
}
break; /* success */
}
freeaddrinfo(addr);
free(psz_service);
return s_ctl;
}
ssize_t tcp_read(int fd, void *buf, size_t count)
{
ssize_t err;
again:
err = recv(fd, buf, count, MSG_WAITALL);
if (err < 0)
{
switch(errno)
{
case EINTR:
case EAGAIN:
goto again;
case ECONNREFUSED:
fprintf(stderr, "remote host refused connection\n");
break;
case ENOTCONN:
fprintf(stderr, "connection not established\n");
break;
default:
fprintf(stderr, "recv error: %s\n", strerror(errno));
return -1;
}
}
return err;
}
#endif
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