ftp.c
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上传日期:2009-03-27
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- /*****************************************************************************
- * ftp.c: FTP input module
- *****************************************************************************
- * Copyright (C) 2001-2004 VideoLAN
- * $Id: ftp.c 8606 2004-08-31 18:32:54Z hartman $
- *
- * Authors: Laurent Aimar <fenrir@via.ecp.fr>
- *
- * 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #include <stdlib.h>
- #include <vlc/vlc.h>
- #include <vlc/input.h>
- #include "network.h"
- /*****************************************************************************
- * Module descriptor
- *****************************************************************************/
- static int Open ( vlc_object_t * );
- static void Close( vlc_object_t * );
- #define CACHING_TEXT N_("Caching value in ms")
- #define CACHING_LONGTEXT N_(
- "Allows you to modify the default caching value for FTP streams. This "
- "value should be set in millisecond units." )
- #define USER_TEXT N_("FTP user name")
- #define USER_LONGTEXT N_("Allows you to modify the user name that will "
- "be used for the connection.")
- #define PASS_TEXT N_("FTP password")
- #define PASS_LONGTEXT N_("Allows you to modify the password that will be "
- "used for the connection.")
- #define ACCOUNT_TEXT N_("FTP account")
- #define ACCOUNT_LONGTEXT N_("Allows you to modify the account that will be "
- "used for the connection.")
- vlc_module_begin();
- set_description( _("FTP input") );
- set_capability( "access2", 0 );
- add_integer( "ftp-caching", 2 * DEFAULT_PTS_DELAY / 1000, NULL,
- CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
- add_string( "ftp-user", "anonymous", NULL, USER_TEXT, USER_LONGTEXT,
- VLC_FALSE );
- add_string( "ftp-pwd", "anonymous@dummy.org", NULL, PASS_TEXT,
- PASS_LONGTEXT, VLC_FALSE );
- add_string( "ftp-account", "anonymous", NULL, ACCOUNT_TEXT,
- ACCOUNT_LONGTEXT, VLC_FALSE );
- add_shortcut( "ftp" );
- set_callbacks( Open, Close );
- vlc_module_end();
- /*****************************************************************************
- * Local prototypes
- *****************************************************************************/
- static int Read( access_t *, uint8_t *, int );
- static int Seek( access_t *, int64_t );
- static int Control( access_t *, int, va_list );
- struct access_sys_t
- {
- vlc_url_t url;
- int fd_cmd;
- int fd_data;
- };
- static int ftp_SendCommand( access_t *, char *, ... );
- static int ftp_ReadCommand( access_t *, int *, char ** );
- static int ftp_StartStream( access_t *, int64_t );
- static int ftp_StopStream ( access_t *);
- /****************************************************************************
- * Open: connect to ftp server and ask for file
- ****************************************************************************/
- static int Open( vlc_object_t *p_this )
- {
- access_t *p_access = (access_t*)p_this;
- access_sys_t *p_sys;
- char *psz;
- int i_answer;
- char *psz_arg;
- /* Init p_access */
- p_access->pf_read = Read;
- p_access->pf_block = NULL;
- p_access->pf_seek = Seek;
- p_access->pf_control = Control;
- p_access->info.i_update = 0;
- p_access->info.i_size = 0;
- p_access->info.i_pos = 0;
- p_access->info.b_eof = VLC_FALSE;
- p_access->info.i_title = 0;
- p_access->info.i_seekpoint = 0;
- p_access->p_sys = p_sys = malloc( sizeof( access_sys_t ) );
- memset( p_sys, 0, sizeof( access_sys_t ) );
- p_sys->fd_cmd = -1;
- p_sys->fd_data = -1;
- /* *** Parse URL and get server addr/port and path *** */
- psz = p_access->psz_path;
- while( *psz == '/' )
- {
- psz++;
- }
- vlc_UrlParse( &p_sys->url, psz, 0 );
- if( p_sys->url.psz_host == NULL || *p_sys->url.psz_host == ' ' )
- {
- msg_Err( p_access, "invalid server name" );
- goto exit_error;
- }
- if( p_sys->url.i_port <= 0 )
- {
- p_sys->url.i_port = 21; /* default port */
- }
- /* *** Open a TCP connection with server *** */
- msg_Dbg( p_access, "waiting for connection..." );
- p_sys->fd_cmd = net_OpenTCP( p_access, p_sys->url.psz_host,
- p_sys->url.i_port );
- if( p_sys->fd_cmd < 0 )
- {
- msg_Err( p_access, "failed to connect with server" );
- goto exit_error;
- }
- for( ;; )
- {
- if( ftp_ReadCommand( p_access, &i_answer, NULL ) != 1 )
- {
- break;
- }
- }
- if( i_answer / 100 != 2 )
- {
- msg_Err( p_access, "connection rejected" );
- goto exit_error;
- }
- msg_Dbg( p_access, "connection accepted (%d)", i_answer );
- psz = var_CreateGetString( p_access, "ftp-user" );
- if( ftp_SendCommand( p_access, "USER %s", psz ) < 0 ||
- ftp_ReadCommand( p_access, &i_answer, NULL ) < 0 )
- {
- free( psz );
- goto exit_error;
- }
- free( psz );
- switch( i_answer / 100 )
- {
- case 2:
- msg_Dbg( p_access, "user accepted" );
- break;
- case 3:
- msg_Dbg( p_access, "password needed" );
- psz = var_CreateGetString( p_access, "ftp-pwd" );
- if( ftp_SendCommand( p_access, "PASS %s", psz ) < 0 ||
- ftp_ReadCommand( p_access, &i_answer, NULL ) < 0 )
- {
- free( psz );
- goto exit_error;
- }
- free( psz );
- switch( i_answer / 100 )
- {
- case 2:
- msg_Dbg( p_access, "password accepted" );
- break;
- case 3:
- msg_Dbg( p_access, "account needed" );
- psz = var_CreateGetString( p_access, "ftp-account" );
- if( ftp_SendCommand( p_access, "ACCT %s",
- psz ) < 0 ||
- ftp_ReadCommand( p_access, &i_answer, NULL ) < 0 )
- {
- free( psz );
- goto exit_error;
- }
- free( psz );
- if( i_answer / 100 != 2 )
- {
- msg_Err( p_access, "account rejected" );
- goto exit_error;
- }
- msg_Dbg( p_access, "account accepted" );
- break;
- default:
- msg_Err( p_access, "password rejected" );
- goto exit_error;
- }
- break;
- default:
- msg_Err( p_access, "user rejected" );
- goto exit_error;
- }
- /* binary mode */
- if( ftp_SendCommand( p_access, "TYPE I" ) < 0 ||
- ftp_ReadCommand( p_access, &i_answer, NULL ) != 2 )
- {
- msg_Err( p_access, "cannot set binary transfer mode" );
- goto exit_error;
- }
- /* get size */
- if( ftp_SendCommand( p_access, "SIZE %s", p_sys->url.psz_path ) < 0 ||
- ftp_ReadCommand( p_access, &i_answer, &psz_arg ) != 2 )
- {
- msg_Err( p_access, "cannot get file size" );
- goto exit_error;
- }
- p_access->info.i_size = atoll( &psz_arg[4] );
- free( psz_arg );
- msg_Dbg( p_access, "file size: "I64Fd, p_access->info.i_size );
- /* Start the 'stream' */
- if( ftp_StartStream( p_access, 0 ) < 0 )
- {
- msg_Err( p_access, "cannot retrieve file" );
- goto exit_error;
- }
- /* Update default_pts to a suitable value for ftp access */
- var_Create( p_access, "ftp-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
- return VLC_SUCCESS;
- exit_error:
- if( p_sys->fd_cmd > 0 )
- {
- net_Close( p_sys->fd_cmd );
- }
- vlc_UrlClean( &p_sys->url );
- free( p_sys );
- return VLC_EGENERIC;
- }
- /*****************************************************************************
- * Close: free unused data structures
- *****************************************************************************/
- static void Close( vlc_object_t *p_this )
- {
- access_t *p_access = (access_t*)p_this;
- access_sys_t *p_sys = p_access->p_sys;
- msg_Dbg( p_access, "stopping stream" );
- ftp_StopStream( p_access );
- if( ftp_SendCommand( p_access, "QUIT" ) < 0 )
- {
- msg_Warn( p_access, "cannot quit" );
- }
- else
- {
- ftp_ReadCommand( p_access, NULL, NULL );
- }
- net_Close( p_sys->fd_cmd );
- /* free memory */
- vlc_UrlClean( &p_sys->url );
- free( p_sys );
- }
- /*****************************************************************************
- * Seek: try to go at the right place
- *****************************************************************************/
- static int Seek( access_t *p_access, int64_t i_pos )
- {
- if( i_pos < 0 )
- {
- return VLC_EGENERIC;
- }
- msg_Dbg( p_access, "seeking to "I64Fd, i_pos );
- ftp_StopStream( p_access );
- if( ftp_StartStream( p_access, i_pos ) < 0 )
- {
- p_access->info.b_eof = VLC_TRUE;
- return VLC_EGENERIC;
- }
- p_access->info.b_eof = VLC_FALSE;
- p_access->info.i_pos = i_pos;
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * Read:
- *****************************************************************************/
- static int Read( access_t *p_access, uint8_t *p_buffer, int i_len )
- {
- access_sys_t *p_sys = p_access->p_sys;
- int i_read;
- if( p_access->info.b_eof )
- return 0;
- i_read = net_Read( p_access, p_sys->fd_data, p_buffer, i_len, VLC_FALSE );
- if( i_read == 0 )
- p_access->info.b_eof = VLC_TRUE;
- else if( i_read > 0 )
- p_access->info.i_pos += i_read;
- return i_read;
- }
- /*****************************************************************************
- * Control:
- *****************************************************************************/
- static int Control( access_t *p_access, int i_query, va_list args )
- {
- vlc_bool_t *pb_bool;
- int *pi_int;
- int64_t *pi_64;
- vlc_value_t val;
- switch( i_query )
- {
- /* */
- case ACCESS_CAN_SEEK:
- pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
- *pb_bool = VLC_TRUE;
- break;
- case ACCESS_CAN_FASTSEEK:
- pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
- *pb_bool = VLC_FALSE;
- break;
- case ACCESS_CAN_PAUSE:
- pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
- *pb_bool = VLC_TRUE; /* FIXME */
- break;
- case ACCESS_CAN_CONTROL_PACE:
- pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
- *pb_bool = VLC_TRUE; /* FIXME */
- break;
- /* */
- case ACCESS_GET_MTU:
- pi_int = (int*)va_arg( args, int * );
- *pi_int = 0;
- break;
- case ACCESS_GET_PTS_DELAY:
- pi_64 = (int64_t*)va_arg( args, int64_t * );
- var_Get( p_access, "ftp-caching", &val );
- *pi_64 = (int64_t)var_GetInteger( p_access, "ftp-caching" ) * I64C(1000);
- break;
- /* */
- case ACCESS_SET_PAUSE_STATE:
- /* Nothing to do */
- break;
- case ACCESS_GET_TITLE_INFO:
- case ACCESS_SET_TITLE:
- case ACCESS_SET_SEEKPOINT:
- case ACCESS_SET_PRIVATE_ID_STATE:
- return VLC_EGENERIC;
- default:
- msg_Warn( p_access, "unimplemented query in control" );
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * ftp_*:
- *****************************************************************************/
- static int ftp_SendCommand( access_t *p_access, char *psz_fmt, ... )
- {
- access_sys_t *p_sys = p_access->p_sys;
- va_list args;
- char *psz_cmd;
- int i_ret;
- va_start( args, psz_fmt );
- vasprintf( &psz_cmd, psz_fmt, args );
- va_end( args );
- msg_Dbg( p_access, "ftp_SendCommand:"%s"", psz_cmd);
- if( ( i_ret = net_Printf( VLC_OBJECT(p_access), p_sys->fd_cmd,
- "%s", psz_cmd ) ) > 0 )
- {
- i_ret = net_Printf( VLC_OBJECT(p_access), p_sys->fd_cmd, "rn" );
- }
- if( i_ret < 0 )
- {
- msg_Err( p_access, "failed to send command" );
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- /* TODO support this s**t :
- RFC 959 allows the client to send certain TELNET strings at any moment,
- even in the middle of a request:
- * 377377.
- * 377376x where x is one byte.
- * 377375x where x is one byte. The server is obliged to send 377374x
- * immediately after reading x.
- * 377374x where x is one byte.
- * 377373x where x is one byte. The server is obliged to send 377376x
- * immediately after reading x.
- * 377x for any other byte x.
- These strings are not part of the requests, except in the case 377377,
- where the request contains one 377. */
- static int ftp_ReadCommand( access_t *p_access,
- int *pi_answer, char **ppsz_answer )
- {
- access_sys_t *p_sys = p_access->p_sys;
- char *psz_line;
- int i_answer;
- psz_line = net_Gets( p_access, p_sys->fd_cmd );
- msg_Dbg( p_access, "answer=%s", psz_line );
- if( psz_line == NULL || strlen( psz_line ) < 3 )
- {
- msg_Err( p_access, "cannot get answer" );
- if( psz_line ) free( psz_line );
- if( pi_answer ) *pi_answer = 500;
- if( ppsz_answer ) *ppsz_answer = NULL;
- return -1;
- }
- if( psz_line[3] == '-' ) /* Multiple response */
- {
- char end[4];
- memcpy( end, psz_line, 3 );
- end[3] = ' ';
- for( ;; )
- {
- char *psz_tmp = net_Gets( p_access, p_sys->fd_cmd );
- if( psz_tmp == NULL ) /* Error */
- break;
- if( !strncmp( psz_tmp, end, 4 ) )
- {
- free( psz_tmp );
- break;
- }
- free( psz_tmp );
- }
- }
- i_answer = atoi( psz_line );
- if( pi_answer ) *pi_answer = i_answer;
- if( ppsz_answer )
- {
- *ppsz_answer = psz_line;
- }
- else
- {
- free( psz_line );
- }
- return( i_answer / 100 );
- }
- static int ftp_StartStream( access_t *p_access, off_t i_start )
- {
- access_sys_t *p_sys = p_access->p_sys;
- char psz_ip[1000];
- int i_answer;
- char *psz_arg, *psz_parser;
- int a1,a2,a3,a4;
- int p1,p2;
- int i_port;
- if( ftp_SendCommand( p_access, "PASV" ) < 0 ||
- ftp_ReadCommand( p_access, &i_answer, &psz_arg ) != 2 )
- {
- msg_Err( p_access, "cannot set passive transfer mode" );
- return VLC_EGENERIC;
- }
- psz_parser = strchr( psz_arg, '(' );
- if( !psz_parser ||
- sscanf( psz_parser, "(%d,%d,%d,%d,%d,%d", &a1, &a2, &a3,
- &a4, &p1, &p2 ) < 6 )
- {
- free( psz_arg );
- msg_Err( p_access, "cannot get ip/port for passive transfer mode" );
- return VLC_EGENERIC;
- }
- free( psz_arg );
- sprintf( psz_ip, "%d.%d.%d.%d", a1, a2, a3, a4 );
- i_port = p1 * 256 + p2;
- msg_Dbg( p_access, "ip:%s port:%d", psz_ip, i_port );
- if( ftp_SendCommand( p_access, "TYPE I" ) < 0 ||
- ftp_ReadCommand( p_access, &i_answer, NULL ) != 2 )
- {
- msg_Err( p_access, "cannot set binary transfer mode" );
- return VLC_EGENERIC;
- }
- if( i_start > 0 )
- {
- if( ftp_SendCommand( p_access, "REST "I64Fu, i_start ) < 0 ||
- ftp_ReadCommand( p_access, &i_answer, NULL ) > 3 )
- {
- msg_Err( p_access, "cannot set restart point" );
- return VLC_EGENERIC;
- }
- }
- msg_Dbg( p_access, "waiting for data connection..." );
- p_sys->fd_data = net_OpenTCP( p_access, psz_ip, i_port );
- if( p_sys->fd_data < 0 )
- {
- msg_Err( p_access, "failed to connect with server" );
- return VLC_EGENERIC;
- }
- msg_Dbg( p_access, "connection with "%s:%d" successful",
- psz_ip, i_port );
- /* "1xx" message */
- if( ftp_SendCommand( p_access, "RETR %s", p_sys->url.psz_path ) < 0 ||
- ftp_ReadCommand( p_access, &i_answer, NULL ) > 2 )
- {
- msg_Err( p_access, "cannot retreive file" );
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- static int ftp_StopStream ( access_t *p_access )
- {
- access_sys_t *p_sys = p_access->p_sys;
- int i_answer;
- if( ftp_SendCommand( p_access, "ABOR" ) < 0 )
- {
- msg_Warn( p_access, "cannot abord file" );
- if( p_sys->fd_data > 0 )
- net_Close( p_sys->fd_data );
- p_sys->fd_data = -1;
- return VLC_EGENERIC;
- }
- if( p_sys->fd_data > 0 )
- {
- net_Close( p_sys->fd_data );
- p_sys->fd_data = -1;
- ftp_ReadCommand( p_access, &i_answer, NULL );
- }
- ftp_ReadCommand( p_access, &i_answer, NULL );
- return VLC_SUCCESS;
- }