tcp.c

VLC Player Source Code

/*****************************************************************************
 * tcp.c:
 *****************************************************************************
 * Copyright (C) 2004-2005 the VideoLAN team
 * Copyright (C) 2005-2006 Rémi Denis-Courmont
 * $Id$
 *
 * Authors: Laurent Aimar <[e-mail]>
 *          Rémi Denis-Courmont <rem # videolan.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>

#include <errno.h>
#include <assert.h>

#ifdef HAVE_FCNTL_H
#   include <fcntl.h>
#endif
#ifdef HAVE_SYS_TIME_H
#    include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
#   include <unistd.h>
#endif
#ifdef HAVE_POLL
# include <poll.h>
#endif

#include <vlc_network.h>
#if defined (WIN32) || defined (UNDER_CE)
#   undef EINPROGRESS
#   define EINPROGRESS WSAEWOULDBLOCK
#   undef EINTR
#   define EINTR WSAEINTR
#   undef ETIMEDOUT
#   define ETIMEDOUT WSAETIMEDOUT
#endif

static int SocksNegotiate( vlc_object_t *, int fd, int i_socks_version,
                           const char *psz_user, const char *psz_passwd );
static int SocksHandshakeTCP( vlc_object_t *,
                              int fd, int i_socks_version,
                              const char *psz_user, const char *psz_passwd,
                              const char *psz_host, int i_port );
extern int net_Socket( vlc_object_t *p_this, int i_family, int i_socktype,
                       int i_protocol );

/*****************************************************************************
 * __net_Connect:
 *****************************************************************************
 * Open a network connection.
 * @return socket handler or -1 on error.
 *****************************************************************************/
int __net_Connect( vlc_object_t *p_this, const char *psz_host, int i_port,
                   int type, int proto )
{
    struct addrinfo hints, *res, *ptr;
    const char      *psz_realhost;
    char            *psz_socks;
    int             i_realport, i_val, i_handle = -1;

    int evfd = vlc_object_waitpipe (p_this);
    if (evfd == -1)
        return -1;

    memset( &hints, 0, sizeof( hints ) );
    hints.ai_socktype = SOCK_STREAM;

    psz_socks = var_CreateGetNonEmptyString( p_this, "socks" );
    if( psz_socks != NULL )
    {
        char *psz = strchr( psz_socks, ':' );

        if( psz )
            *psz++ = '\0';

        psz_realhost = psz_socks;
        i_realport = ( psz != NULL ) ? atoi( psz ) : 1080;
        hints.ai_flags &= ~AI_NUMERICHOST;

        msg_Dbg( p_this, "net: connecting to %s port %d (SOCKS) "
                 "for %s port %d", psz_realhost, i_realport,
                 psz_host, i_port );

        /* We only implement TCP with SOCKS */
        switch( type )
        {
            case 0:
                type = SOCK_STREAM;
            case SOCK_STREAM:
                break;
            default:
                msg_Err( p_this, "Socket type not supported through SOCKS" );
                free( psz_socks );
                return -1;
        }
        switch( proto )
        {
            case 0:
                proto = IPPROTO_TCP;
            case IPPROTO_TCP:
                break;
            default:
                msg_Err( p_this, "Transport not supported through SOCKS" );
                free( psz_socks );
                return -1;
        }
    }
    else
    {
        psz_realhost = psz_host;
        i_realport = i_port;

        msg_Dbg( p_this, "net: connecting to %s port %d", psz_realhost,
                 i_realport );
    }

    i_val = vlc_getaddrinfo( p_this, psz_realhost, i_realport, &hints, &res );
    free( psz_socks );

    if( i_val )
    {
        msg_Err( p_this, "cannot resolve %s port %d : %s", psz_realhost,
                 i_realport, vlc_gai_strerror( i_val ) );
        return -1;
    }

    for( ptr = res; ptr != NULL; ptr = ptr->ai_next )
    {
        int fd = net_Socket( p_this, ptr->ai_family, type ?: ptr->ai_socktype,
                             proto ?: ptr->ai_protocol );
        if( fd == -1 )
        {
            msg_Dbg( p_this, "socket error: %m" );
            continue;
        }

        if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) )
        {
            int timeout, val;

            if( net_errno != EINPROGRESS && net_errno != EINTR )
            {
                msg_Err( p_this, "connection failed: %m" );
                goto next_ai;
            }
            msg_Dbg( p_this, "connection: %m" );

            timeout = var_CreateGetInteger (p_this, "ipv4-timeout");
            if (timeout < 0)
            {
                msg_Err( p_this, "invalid negative value for ipv4-timeout" );
                timeout = 0;
            }

            struct pollfd ufd[2] = {
                { .fd = fd,   .events = POLLOUT },
                { .fd = evfd, .events = POLLIN },
            };

            do
                /* NOTE: timeout screwed up if we catch a signal (EINTR) */
                val = poll (ufd, sizeof (ufd) / sizeof (ufd[0]), timeout);
            while ((val == -1) && (net_errno == EINTR));

            switch (val)
            {
                 case -1: /* error */
                     msg_Err (p_this, "connection polling error: %m");
                     goto next_ai;

                 case 0: /* timeout */
                     msg_Warn (p_this, "connection timed out");
                     goto next_ai;

                 default: /* something happended */
                     if (ufd[1].revents)
                         goto next_ai; /* LibVLC object killed */
            }

            /* There is NO WAY around checking SO_ERROR.
             * Don't ifdef it out!!! */
            if (getsockopt (fd, SOL_SOCKET, SO_ERROR, &val,
                            &(socklen_t){ sizeof (val) }) || val)
            {
                errno = val;
                msg_Err (p_this, "connection failed: %m");
                goto next_ai;
            }
        }

        msg_Dbg( p_this, "connection succeeded (socket = %d)", fd );
        i_handle = fd; /* success! */
        break;

next_ai: /* failure */
        net_Close( fd );
        continue;
    }

    vlc_freeaddrinfo( res );

    if( i_handle == -1 )
        return -1;

    if( psz_socks != NULL )
    {
        /* NOTE: psz_socks already free'd! */
        char *psz_user = var_CreateGetNonEmptyString( p_this, "socks-user" );
        char *psz_pwd  = var_CreateGetNonEmptyString( p_this, "socks-pwd" );

        if( SocksHandshakeTCP( p_this, i_handle, 5, psz_user, psz_pwd,
                               psz_host, i_port ) )
        {
            msg_Err( p_this, "SOCKS handshake failed" );
            net_Close( i_handle );
            i_handle = -1;
        }

        free( psz_user );
        free( psz_pwd );
    }

    return i_handle;
}


int net_AcceptSingle (vlc_object_t *obj, int lfd)
{
    int fd;
    do
        fd = accept (lfd, NULL, NULL);
    while (fd == -1 && errno == EINTR);

    if (fd == -1)
    {
        if (net_errno != EAGAIN)
            msg_Err (obj, "accept failed (from socket %d): %m", lfd);
        return -1;
    }

    msg_Dbg (obj, "accepted socket %d (from socket %d)", fd, lfd);
    net_SetupSocket (fd);
    return fd;
}


/*****************************************************************************
 * __net_Accept:
 *****************************************************************************
 * Accept a connection on a set of listening sockets and return it
 *****************************************************************************/