/src/network/tcp.c
C | 296 lines | 206 code | 49 blank | 41 comment | 71 complexity | 25d12b9c6ca02f87945dcc4b19152957 MD5 | raw file
- /*****************************************************************************
- * tcp.c:
- *****************************************************************************
- * Copyright (C) 2004-2005 VLC authors and VideoLAN
- * Copyright (C) 2005-2006 Rémi Denis-Courmont
- *
- * Authors: Laurent Aimar <fenrir@videolan.org>
- * 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 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 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 Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser 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 <unistd.h>
- #include <vlc_network.h>
- #include <vlc_interrupt.h>
- /*****************************************************************************
- * SocksNegotiate:
- *****************************************************************************
- * Negotiate authentication with a SOCKS server.
- *****************************************************************************/
- static int SocksNegotiate( vlc_object_t *p_obj,
- int fd, int i_socks_version,
- const char *psz_socks_user,
- const char *psz_socks_passwd )
- {
- uint8_t buffer[128+2*256];
- int i_len;
- bool b_auth = false;
- if( i_socks_version != 5 )
- return VLC_SUCCESS;
- /* We negotiate authentication */
- buffer[0] = i_socks_version; /* SOCKS version */
- if( psz_socks_user != NULL && psz_socks_passwd != NULL )
- {
- buffer[1] = 2; /* Number of methods */
- buffer[2] = 0x00; /* - No auth required */
- buffer[3] = 0x02; /* - USer/Password */
- i_len = 4;
- b_auth = true;
- }
- else
- {
- buffer[1] = 1; /* Number of methods */
- buffer[2] = 0x00; /* - No auth required */
- i_len = 3;
- }
- if( net_Write( p_obj, fd, buffer, i_len ) != i_len )
- return VLC_EGENERIC;
- if( net_Read( p_obj, fd, buffer, 2) != 2 )
- return VLC_EGENERIC;
- msg_Dbg( p_obj, "socks: v=%d method=%x", buffer[0], buffer[1] );
- if( buffer[1] == 0x00 )
- {
- msg_Dbg( p_obj, "socks: no authentication required" );
- }
- else if( buffer[1] == 0x02 )
- {
- if( psz_socks_user == NULL || psz_socks_passwd == NULL )
- {
- msg_Err( p_obj, "socks: server mandates authentication but "
- "a username and/or password was not supplied" );
- return VLC_EGENERIC;
- }
- int const i_user = strlen( psz_socks_user );
- int const i_pasw = strlen( psz_socks_passwd );
- if( i_user > 255 || i_pasw > 255 )
- {
- msg_Err( p_obj, "socks: rejecting username and/or password due to "
- "violation of RFC1929 (longer than 255 bytes)" );
- return VLC_EGENERIC;
- }
- msg_Dbg( p_obj, "socks: username/password authentication" );
- buffer[0] = i_socks_version; /* Version */
- buffer[1] = i_user; /* User length */
- memcpy( &buffer[2], psz_socks_user, i_user );
- buffer[2+i_user] = i_pasw; /* Password length */
- memcpy( &buffer[2+i_user+1], psz_socks_passwd, i_pasw );
- i_len = 3 + i_user + i_pasw;
- if( net_Write( p_obj, fd, buffer, i_len ) != i_len )
- return VLC_EGENERIC;
- if( net_Read( p_obj, fd, buffer, 2 ) != 2 )
- return VLC_EGENERIC;
- msg_Dbg( p_obj, "socks: v=%d status=%x", buffer[0], buffer[1] );
- if( buffer[1] != 0x00 )
- {
- msg_Err( p_obj, "socks: authentication rejected" );
- return VLC_EGENERIC;
- }
- }
- else
- {
- if( b_auth )
- msg_Err( p_obj, "socks: unsupported authentication method %x",
- buffer[0] );
- else
- msg_Err( p_obj, "socks: authentication needed" );
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * SocksHandshakeTCP:
- *****************************************************************************
- * Open a TCP connection using a SOCKS server and return a handle (RFC 1928)
- *****************************************************************************/
- static int SocksHandshakeTCP( vlc_object_t *p_obj,
- int fd,
- int i_socks_version,
- const char *psz_user, const char *psz_passwd,
- const char *psz_host, int i_port )
- {
- uint8_t buffer[128+2*256];
- if( i_socks_version != 4 && i_socks_version != 5 )
- {
- msg_Warn( p_obj, "invalid socks protocol version %d", i_socks_version );
- i_socks_version = 5;
- }
- if( i_socks_version == 5 &&
- SocksNegotiate( p_obj, fd, i_socks_version,
- psz_user, psz_passwd ) )
- return VLC_EGENERIC;
- if( i_socks_version == 4 )
- {
- /* v4 only support ipv4 */
- static const struct addrinfo hints = {
- .ai_family = AF_INET,
- .ai_socktype = SOCK_STREAM,
- .ai_protocol = IPPROTO_TCP,
- .ai_flags = AI_IDN,
- };
- struct addrinfo *res;
- if (vlc_getaddrinfo_i11e(psz_host, 0, &hints, &res))
- return VLC_EGENERIC;
- buffer[0] = i_socks_version;
- buffer[1] = 0x01; /* CONNECT */
- SetWBE( &buffer[2], i_port ); /* Port */
- memcpy (&buffer[4], /* Address */
- &((struct sockaddr_in *)(res->ai_addr))->sin_addr, 4);
- freeaddrinfo (res);
- buffer[8] = 0; /* Empty user id */
- if( net_Write( p_obj, fd, buffer, 9 ) != 9 )
- return VLC_EGENERIC;
- if( net_Read( p_obj, fd, buffer, 8 ) != 8 )
- return VLC_EGENERIC;
- msg_Dbg( p_obj, "socks: v=%d cd=%d",
- buffer[0], buffer[1] );
- if( buffer[1] != 90 )
- return VLC_EGENERIC;
- }
- else if( i_socks_version == 5 )
- {
- int i_hlen = __MIN(strlen( psz_host ), 255);
- int i_len;
- buffer[0] = i_socks_version; /* Version */
- buffer[1] = 0x01; /* Cmd: connect */
- buffer[2] = 0x00; /* Reserved */
- buffer[3] = 3; /* ATYP: for now domainname */
- buffer[4] = i_hlen;
- memcpy( &buffer[5], psz_host, i_hlen );
- SetWBE( &buffer[5+i_hlen], i_port );
- i_len = 5 + i_hlen + 2;
- if( net_Write( p_obj, fd, buffer, i_len ) != i_len )
- return VLC_EGENERIC;
- /* Read the header */
- if( net_Read( p_obj, fd, buffer, 5 ) != 5 )
- return VLC_EGENERIC;
- msg_Dbg( p_obj, "socks: v=%d rep=%d atyp=%d",
- buffer[0], buffer[1], buffer[3] );
- if( buffer[1] != 0x00 )
- {
- msg_Err( p_obj, "socks: CONNECT request failed" );
- return VLC_EGENERIC;
- }
- /* Read the remaining bytes */
- if( buffer[3] == 0x01 )
- i_len = 4-1 + 2;
- else if( buffer[3] == 0x03 )
- i_len = buffer[4] + 2;
- else if( buffer[3] == 0x04 )
- i_len = 16-1+2;
- else
- return VLC_EGENERIC;
- if( net_Read( p_obj, fd, buffer, i_len ) != i_len )
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- int (net_ConnectTCP)(vlc_object_t *obj, const char *host, int serv)
- {
- const char *realhost;
- int realserv;
- char *socks = var_InheritString(obj, "socks");
- if (socks != NULL)
- {
- realhost = socks;
- char *p = strchr(socks, ':');
- if (p != NULL)
- {
- *(p++) = '\0';
- realserv = atoi(p);
- }
- else
- realserv = 1080;
- msg_Dbg(obj, "net: connecting to %s port %d (SOCKS) "
- "for %s port %d", realhost, realserv, host, serv);
- }
- else
- {
- msg_Dbg(obj, "net: connecting to %s port %d", host, serv);
- realhost = host;
- realserv = serv;
- }
- int fd = net_Connect(obj, realhost, realserv, SOCK_STREAM, IPPROTO_TCP);
- if (socks != NULL && fd != -1)
- {
- /* NOTE: psz_socks already free'd! */
- char *user = var_InheritString(obj, "socks-user");
- char *pwd = var_InheritString(obj, "socks-pwd");
- if (SocksHandshakeTCP(obj, fd, 5, user, pwd, host, serv))
- {
- msg_Err(obj, "SOCKS handshake failed");
- net_Close(fd);
- fd = -1;
- }
- free(pwd);
- free(user);
- }
- return fd;
- }