modules/access/ftp.c

   1 /*****************************************************************************
   2  * ftp.c: FTP input module
   3  *****************************************************************************
   4  * Copyright (C) 2001-2006 the VideoLAN team
   5  * Copyright © 2006 Rémi Denis-Courmont
   6  * $Id$
   7  *
   8  * Authors: Laurent Aimar <fenrir@via.ecp.fr> - original code
   9  *          Rémi Denis-Courmont <rem # videolan.org> - EPSV support
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35
  36 #include <assert.h>
  37
  38 #include <vlc_access.h>
  39 #include <vlc_dialog.h>
  40
  41 #include <vlc_network.h>
  42 #include <vlc_url.h>
  43 #include <vlc_sout.h>
  44 #include <vlc_charset.h>
  45
  46 #ifndef IPPORT_FTP
  47 # define IPPORT_FTP 21u
  48 #endif
  49
  50 /*****************************************************************************
  51  * Module descriptor
  52  *****************************************************************************/
  53 static int   InOpen ( vlc_object_t * );
  54 static void  InClose( vlc_object_t * );
  55 static int  OutOpen ( vlc_object_t * );
  56 static void OutClose( vlc_object_t * );
  57
  58 #define USER_TEXT N_("FTP user name")
  59 #define USER_LONGTEXT N_("User name that will " \
  60     "be used for the connection.")
  61 #define PASS_TEXT N_("FTP password")
  62 #define PASS_LONGTEXT N_("Password that will be " \
  63     "used for the connection.")
  64 #define ACCOUNT_TEXT N_("FTP account")
  65 #define ACCOUNT_LONGTEXT N_("Account that will be " \
  66     "used for the connection.")
  67
  68 vlc_module_begin ()
  69     set_shortname( "FTP" )
  70     set_description( N_("FTP input") )
  71     set_capability( "access", 0 )
  72     set_category( CAT_INPUT )
  73     set_subcategory( SUBCAT_INPUT_ACCESS )
  74     add_string( "ftp-user", "anonymous", USER_TEXT, USER_LONGTEXT,
  75                 false )
  76     add_string( "ftp-pwd", "anonymous@example.com", PASS_TEXT,
  77                 PASS_LONGTEXT, false )
  78     add_string( "ftp-account", "anonymous", ACCOUNT_TEXT,
  79                 ACCOUNT_LONGTEXT, false )
  80     add_shortcut( "ftp" )
  81     set_callbacks( InOpen, InClose )
  82
  83     add_submodule ()
  84         set_shortname( "FTP" )
  85         set_description( N_("FTP upload output") )
  86         set_capability( "sout access", 0 )
  87         set_category( CAT_SOUT )
  88         set_subcategory( SUBCAT_SOUT_ACO )
  89         add_shortcut( "ftp" )
  90         set_callbacks( OutOpen, OutClose )
  91 vlc_module_end ()
  92
  93 /*****************************************************************************
  94  * Local prototypes
  95  *****************************************************************************/
  96 static ssize_t Read( access_t *, uint8_t *, size_t );
  97 static ssize_t Write( sout_access_out_t *, block_t * );
  98 static int Seek( access_t *, uint64_t );
  99 static int OutSeek( sout_access_out_t *, off_t );
 100 static int Control( access_t *, int, va_list );
 101
 102 struct access_sys_t
 103 {
 104     vlc_url_t  url;
 105
 106     int        fd_cmd;
 107     int        fd_data;
 108
 109     char       sz_epsv_ip[NI_MAXNUMERICHOST];
 110     bool       out;
 111     bool       directory;
 112 };
 113 #define GET_OUT_SYS( p_this ) \
 114     ((access_sys_t *)(((sout_access_out_t *)(p_this))->p_sys))
 115
 116 static int ftp_SendCommand( vlc_object_t *, access_sys_t *, const char *, ... );
 117 static int ftp_ReadCommand( vlc_object_t *, access_sys_t *, int *, char ** );
 118 static int ftp_StartStream( vlc_object_t *, access_sys_t *, uint64_t );
 119 static int ftp_StopStream ( vlc_object_t *, access_sys_t * );
 120
 121 static int Login( vlc_object_t *p_access, access_sys_t *p_sys )
 122 {
 123     int i_answer;
 124     char *psz;
 125
 126     /* *** Open a TCP connection with server *** */
 127     int fd = p_sys->fd_cmd = net_ConnectTCP( p_access, p_sys->url.psz_host,
 128                                              p_sys->url.i_port );
 129     if( fd == -1 )
 130     {
 131         msg_Err( p_access, "connection failed" );
 132         dialog_Fatal( p_access, _("Network interaction failed"), "%s",
 133                         _("VLC could not connect with the given server.") );
 134         return -1;
 135     }
 136
 137     while( ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) == 1 );
 138
 139     if( i_answer / 100 != 2 )
 140     {
 141         msg_Err( p_access, "connection rejected" );
 142         dialog_Fatal( p_access, _("Network interaction failed"), "%s",
 143                         _("VLC's connection to the given server was rejected.") );
 144         return -1;
 145     }
 146
 147     msg_Dbg( p_access, "connection accepted (%d)", i_answer );
 148
 149     if( p_sys->url.psz_username && *p_sys->url.psz_username )
 150         psz = strdup( p_sys->url.psz_username );
 151     else
 152         psz = var_InheritString( p_access, "ftp-user" );
 153     if( !psz )
 154         return -1;
 155
 156     if( ftp_SendCommand( p_access, p_sys, "USER %s", psz ) < 0 ||
 157         ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) < 0 )
 158     {
 159         free( psz );
 160         return -1;
 161     }
 162     free( psz );
 163
 164     switch( i_answer / 100 )
 165     {
 166         case 2:
 167             msg_Dbg( p_access, "user accepted" );
 168             break;
 169         case 3:
 170             msg_Dbg( p_access, "password needed" );
 171             if( p_sys->url.psz_password && *p_sys->url.psz_password )
 172                 psz = strdup( p_sys->url.psz_password );
 173             else
 174                 psz = var_InheritString( p_access, "ftp-pwd" );
 175             if( !psz )
 176                 return -1;
 177
 178             if( ftp_SendCommand( p_access, p_sys, "PASS %s", psz ) < 0 ||
 179                 ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) < 0 )
 180             {
 181                 free( psz );
 182                 return -1;
 183             }
 184             free( psz );
 185
 186             switch( i_answer / 100 )
 187             {
 188                 case 2:
 189                     msg_Dbg( p_access, "password accepted" );
 190                     break;
 191                 case 3:
 192                     msg_Dbg( p_access, "account needed" );
 193                     psz = var_InheritString( p_access, "ftp-account" );
 194                     if( ftp_SendCommand( p_access, p_sys, "ACCT %s",
 195                                          psz ) < 0 ||
 196                         ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) < 0 )
 197                     {
 198                         free( psz );
 199                         return -1;
 200                     }
 201                     free( psz );
 202
 203                     if( i_answer / 100 != 2 )
 204                     {
 205                         msg_Err( p_access, "account rejected" );
 206                         dialog_Fatal( p_access,
 207                                       _("Network interaction failed"),
 208                                       "%s", _("Your account was rejected.") );
 209                         return -1;
 210                     }
 211                     msg_Dbg( p_access, "account accepted" );
 212                     break;
 213
 214                 default:
 215                     msg_Err( p_access, "password rejected" );
 216                     dialog_Fatal( p_access, _("Network interaction failed"),
 217                                   "%s",  _("Your password was rejected.") );
 218                     return -1;
 219             }
 220             break;
 221         default:
 222             msg_Err( p_access, "user rejected" );
 223             dialog_Fatal( p_access, _("Network interaction failed"), "%s",
 224                         _("Your connection attempt to the server was rejected.") );
 225             return -1;
 226     }
 227
 228     return 0;
 229 }
 230
 231 static int Connect( vlc_object_t *p_access, access_sys_t *p_sys )
 232 {
 233     if( Login( p_access, p_sys ) < 0 )
 234         return -1;
 235
 236     /* Extended passive mode */
 237     if( ftp_SendCommand( p_access, p_sys, "EPSV ALL" ) < 0 )
 238     {
 239         msg_Err( p_access, "cannot request extended passive mode" );
 240         net_Close( p_sys->fd_cmd );
 241         return -1;
 242     }
 243
 244     if( ftp_ReadCommand( p_access, p_sys, NULL, NULL ) == 2 )
 245     {
 246         if( net_GetPeerAddress( p_sys->fd_cmd, p_sys->sz_epsv_ip, NULL ) )
 247         {
 248             net_Close( p_sys->fd_cmd );
 249             return -1;
 250         }
 251     }
 252     else
 253     {
 254         /* If ESPV ALL fails, we fallback to PASV.
 255          * We have to restart the connection in case there is a NAT that
 256          * understands EPSV ALL in the way, and hence won't allow PASV on
 257          * the initial connection.
 258          */
 259         msg_Info( p_access, "FTP Extended passive mode disabled" );
 260         net_Close( p_sys->fd_cmd );
 261
 262         if( Login( p_access, p_sys ) )
 263         {
 264             net_Close( p_sys->fd_cmd );
 265             return -1;
 266         }
 267     }
 268
 269     /* check binary mode support */
 270     if( ftp_SendCommand( p_access, p_sys, "TYPE I" ) < 0 ||
 271         ftp_ReadCommand( p_access, p_sys, NULL, NULL ) != 2 )
 272     {
 273         msg_Err( p_access, "cannot set binary transfer mode" );
 274         net_Close( p_sys->fd_cmd );
 275         return -1;
 276     }
 277
 278     return 0;
 279 }
 280
 281
 282 static int parseURL( vlc_url_t *url, const char *path )
 283 {
 284     if( path == NULL )
 285         return VLC_EGENERIC;
 286
 287     /* *** Parse URL and get server addr/port and path *** */
 288     while( *path == '/' )
 289         path++;
 290
 291     vlc_UrlParse( url, path, 0 );
 292
 293     if( url->psz_host == NULL || *url->psz_host == '\0' )
 294         return VLC_EGENERIC;
 295
 296     if( url->i_port <= 0 )
 297         url->i_port = IPPORT_FTP; /* default port */
 298
 299     if( url->psz_path == NULL )
 300         return VLC_SUCCESS;
 301     /* FTP URLs are relative to user's default directory (RFC1738 §3.2)
 302     For absolute path use ftp://foo.bar//usr/local/etc/filename */
 303     /* FIXME: we should issue a series of CWD, one per slash */
 304     if( url->psz_path )
 305     {
 306         assert( url->psz_path[0] == '/' );
 307         url->psz_path++;
 308     }
 309
 310     char *type = strstr( url->psz_path, ";type=" );
 311     if( type )
 312     {
 313         *type = '\0';
 314         if( strchr( "iI", type[6] ) == NULL )
 315             return VLC_EGENERIC; /* ASCII and directory not supported */
 316     }
 317     decode_URI( url->psz_path );
 318     /* FIXME: check for UTF-8 support, otherwise only ASCII is allowed */
 319     EnsureUTF8( url->psz_path );
 320     return VLC_SUCCESS;
 321 }
 322
 323
 324 /****************************************************************************
 325  * Open: connect to ftp server and ask for file
 326  ****************************************************************************/
 327 static int InOpen( vlc_object_t *p_this )
 328 {
 329     access_t     *p_access = (access_t*)p_this;
 330     access_sys_t *p_sys;
 331     char         *psz_arg;
 332
 333     /* Init p_access */
 334     STANDARD_READ_ACCESS_INIT
 335     p_sys->fd_data = -1;
 336     p_sys->out = false;
 337     p_sys->directory = false;
 338
 339     if( parseURL( &p_sys->url, p_access->psz_location ) )
 340         goto exit_error;
 341
 342     if( Connect( p_this, p_sys ) )
 343         goto exit_error;
 344
 345     /* get size */
 346     if( p_sys->url.psz_path == NULL )
 347         p_sys->directory = true;
 348     else
 349     if( ftp_SendCommand( p_this, p_sys, "SIZE %s", p_sys->url.psz_path ) < 0 )
 350         goto error;
 351     else
 352     if ( ftp_ReadCommand( p_this, p_sys, NULL, &psz_arg ) == 2 )
 353     {
 354         p_access->info.i_size = atoll( &psz_arg[4] );
 355         free( psz_arg );
 356         msg_Dbg( p_access, "file size: %"PRIu64, p_access->info.i_size );
 357     }
 358     else
 359     if( ftp_SendCommand( p_this, p_sys, "CWD %s", p_sys->url.psz_path ) < 0 )
 360         goto error;
 361     else
 362     if( ftp_ReadCommand( p_this, p_sys, NULL, NULL ) != 2 )
 363     {
 364         msg_Err( p_access, "file or directory does not exist" );
 365         goto error;
 366     }
 367     else
 368         p_sys->directory = true;
 369
 370     /* Start the 'stream' */
 371     if( ftp_StartStream( p_this, p_sys, 0 ) < 0 )
 372     {
 373         msg_Err( p_access, "cannot retrieve file" );
 374         net_Close( p_sys->fd_cmd );
 375         goto exit_error;
 376     }
 377
 378     return VLC_SUCCESS;
 379
 380 error:
 381     net_Close( p_sys->fd_cmd );
 382 exit_error:
 383     vlc_UrlClean( &p_sys->url );
 384     free( p_sys );
 385     return VLC_EGENERIC;
 386 }
 387
 388 static int OutOpen( vlc_object_t *p_this )
 389 {
 390     sout_access_out_t *p_access = (sout_access_out_t *)p_this;
 391     access_sys_t      *p_sys;
 392
 393     p_sys = calloc( 1, sizeof( *p_sys ) );
 394     if( !p_sys )
 395         return VLC_ENOMEM;
 396
 397     /* Init p_access */
 398     p_sys->fd_data = -1;
 399     p_sys->out = true;
 400
 401     if( parseURL( &p_sys->url, p_access->psz_path ) )
 402         goto exit_error;
 403     if( p_sys->url.psz_path == NULL )
 404     {
 405         msg_Err( p_this, "no filename specified" );
 406         goto exit_error;
 407     }
 408
 409     if( Connect( p_this, p_sys ) )
 410         goto exit_error;
 411
 412     /* Start the 'stream' */
 413     if( ftp_StartStream( p_this, p_sys, 0 ) < 0 )
 414     {
 415         msg_Err( p_access, "cannot store file" );
 416         net_Close( p_sys->fd_cmd );
 417         goto exit_error;
 418     }
 419
 420     p_access->pf_seek = OutSeek;
 421     p_access->pf_write = Write;
 422     p_access->p_sys = (void *)p_sys;
 423
 424     return VLC_SUCCESS;
 425
 426 exit_error:
 427     vlc_UrlClean( &p_sys->url );
 428     free( p_sys );
 429     return VLC_EGENERIC;
 430 }
 431
 432 /*****************************************************************************
 433  * Close: free unused data structures
 434  *****************************************************************************/
 435 static void Close( vlc_object_t *p_access, access_sys_t *p_sys )
 436 {
 437     msg_Dbg( p_access, "stopping stream" );
 438     ftp_StopStream( p_access, p_sys );
 439
 440     if( ftp_SendCommand( p_access, p_sys, "QUIT" ) < 0 )
 441     {
 442         msg_Warn( p_access, "cannot quit" );
 443     }
 444     else
 445     {
 446         ftp_ReadCommand( p_access, p_sys, NULL, NULL );
 447     }
 448     net_Close( p_sys->fd_cmd );
 449
 450     /* free memory */
 451     vlc_UrlClean( &p_sys->url );
 452     free( p_sys );
 453 }
 454
 455 static void InClose( vlc_object_t *p_this )
 456 {
 457     Close( p_this, ((access_t *)p_this)->p_sys);
 458 }
 459
 460 static void OutClose( vlc_object_t *p_this )
 461 {
 462     Close( p_this, GET_OUT_SYS(p_this));
 463 }
 464
 465
 466 /*****************************************************************************
 467  * Seek: try to go at the right place
 468  *****************************************************************************/
 469 static int _Seek( vlc_object_t *p_access, access_sys_t *p_sys, uint64_t i_pos )
 470 {
 471     msg_Dbg( p_access, "seeking to %"PRIu64, i_pos );
 472
 473     ftp_StopStream( (vlc_object_t *)p_access, p_sys );
 474     if( ftp_StartStream( (vlc_object_t *)p_access, p_sys, i_pos ) < 0 )
 475         return VLC_EGENERIC;
 476
 477     return VLC_SUCCESS;
 478 }
 479
 480 static int Seek( access_t *p_access, uint64_t i_pos )
 481 {
 482     int val = _Seek( (vlc_object_t *)p_access, p_access->p_sys, i_pos );
 483     if( val )
 484         return val;
 485
 486     p_access->info.b_eof = false;
 487     p_access->info.i_pos = i_pos;
 488
 489     return VLC_SUCCESS;
 490 }
 491
 492 static int OutSeek( sout_access_out_t *p_access, off_t i_pos )
 493 {
 494     return _Seek( (vlc_object_t *)p_access, GET_OUT_SYS( p_access ), i_pos);
 495 }
 496
 497 /*****************************************************************************
 498  * Read:
 499  *****************************************************************************/
 500 static ssize_t Read( access_t *p_access, uint8_t *p_buffer, size_t i_len )
 501 {
 502     access_sys_t *p_sys = p_access->p_sys;
 503
 504     assert( p_sys->fd_data != -1 );
 505     assert( !p_sys->out );
 506
 507     if( p_access->info.b_eof )
 508         return 0;
 509
 510     if( p_sys->directory )
 511     {
 512         char *psz_line = net_Gets( p_access, p_sys->fd_data, NULL );
 513         if( !psz_line )
 514         {
 515             p_access->info.b_eof = true;
 516             return 0;
 517         }
 518         else
 519         {
 520             snprintf( (char*)p_buffer, i_len, "ftp://%s:%d/%s/%s\n",
 521                       p_sys->url.psz_host, p_sys->url.i_port,
 522                       p_sys->url.psz_path, psz_line );
 523             free( psz_line );
 524             return strlen( (const char *)p_buffer );
 525         }
 526     }
 527     else
 528     {
 529         int i_read = net_Read( p_access, p_sys->fd_data, NULL,
 530                                p_buffer, i_len, false );
 531         if( i_read == 0 )
 532             p_access->info.b_eof = true;
 533         else if( i_read > 0 )
 534             p_access->info.i_pos += i_read;
 535
 536         return i_read;
 537     }
 538 }
 539
 540 /*****************************************************************************
 541  * Write:
 542  *****************************************************************************/
 543 static ssize_t Write( sout_access_out_t *p_access, block_t *p_buffer )
 544 {
 545     access_sys_t *p_sys = GET_OUT_SYS(p_access);
 546     size_t i_write = 0;
 547
 548     assert( p_sys->fd_data != -1 );
 549
 550     while( p_buffer != NULL )
 551     {
 552         block_t *p_next = p_buffer->p_next;;
 553
 554         i_write += net_Write( p_access, p_sys->fd_data, NULL,
 555                               p_buffer->p_buffer, p_buffer->i_buffer );
 556         block_Release( p_buffer );
 557
 558         p_buffer = p_next;
 559     }
 560
 561     return i_write;
 562 }
 563
 564 /*****************************************************************************
 565  * Control:
 566  *****************************************************************************/
 567 static int Control( access_t *p_access, int i_query, va_list args )
 568 {
 569     bool    *pb_bool;
 570     int64_t *pi_64;
 571
 572     switch( i_query )
 573     {
 574         /* */
 575         case ACCESS_CAN_SEEK:
 576             pb_bool = (bool*)va_arg( args, bool* );
 577             *pb_bool = !p_access->p_sys->directory;
 578             break;
 579         case ACCESS_CAN_FASTSEEK:
 580             pb_bool = (bool*)va_arg( args, bool* );
 581             *pb_bool = false;
 582             break;
 583         case ACCESS_CAN_PAUSE:
 584             pb_bool = (bool*)va_arg( args, bool* );
 585             *pb_bool = true;    /* FIXME */
 586             break;
 587         case ACCESS_CAN_CONTROL_PACE:
 588             pb_bool = (bool*)va_arg( args, bool* );
 589             *pb_bool = true;    /* FIXME */
 590             break;
 591
 592         /* */
 593         case ACCESS_GET_PTS_DELAY:
 594             pi_64 = (int64_t*)va_arg( args, int64_t * );
 595             *pi_64 = INT64_C(1000)
 596                    * var_InheritInteger( p_access, "network-caching" );
 597             break;
 598
 599         /* */
 600         case ACCESS_SET_PAUSE_STATE:
 601             pb_bool = (bool*)va_arg( args, bool* );
 602             if ( !pb_bool )
 603               return Seek( p_access, p_access->info.i_pos );
 604             break;
 605
 606         case ACCESS_GET_TITLE_INFO:
 607         case ACCESS_SET_TITLE:
 608         case ACCESS_SET_SEEKPOINT:
 609         case ACCESS_SET_PRIVATE_ID_STATE:
 610         case ACCESS_GET_CONTENT_TYPE:
 611         case ACCESS_GET_META:
 612             return VLC_EGENERIC;
 613
 614         default:
 615             msg_Warn( p_access, "unimplemented query in control: %d", i_query);
 616             return VLC_EGENERIC;
 617
 618     }
 619     return VLC_SUCCESS;
 620 }
 621
 622 /*****************************************************************************
 623  * ftp_*:
 624  *****************************************************************************/
 625 static int ftp_SendCommand( vlc_object_t *p_access, access_sys_t *p_sys,
 626                             const char *psz_fmt, ... )
 627 {
 628     va_list      args;
 629     char         *psz_cmd;
 630
 631     va_start( args, psz_fmt );
 632     if( vasprintf( &psz_cmd, psz_fmt, args ) == -1 )
 633         return VLC_EGENERIC;
 634
 635     va_end( args );
 636
 637     msg_Dbg( p_access, "ftp_SendCommand:\"%s\"", psz_cmd);
 638
 639     if( net_Printf( p_access, p_sys->fd_cmd, NULL, "%s\r\n", psz_cmd ) < 0 )
 640     {
 641         msg_Err( p_access, "failed to send command" );
 642         return VLC_EGENERIC;
 643     }
 644     return VLC_SUCCESS;
 645 }
 646
 647 /* TODO support this s**t :
 648  RFC 959 allows the client to send certain TELNET strings at any moment,
 649  even in the middle of a request:
 650
 651  * \377\377.
 652  * \377\376x where x is one byte.
 653  * \377\375x where x is one byte. The server is obliged to send \377\374x
 654  *                                immediately after reading x.
 655  * \377\374x where x is one byte.
 656  * \377\373x where x is one byte. The server is obliged to send \377\376x
 657  *                                immediately after reading x.
 658  * \377x for any other byte x.
 659
 660  These strings are not part of the requests, except in the case \377\377,
 661  where the request contains one \377. */
 662 static int ftp_ReadCommand( vlc_object_t *p_access, access_sys_t *p_sys,
 663                             int *pi_answer, char **ppsz_answer )
 664 {
 665     char         *psz_line;
 666     int          i_answer;
 667
 668     psz_line = net_Gets( p_access, p_sys->fd_cmd, NULL );
 669     if( psz_line == NULL || strlen( psz_line ) < 3 )
 670     {
 671         msg_Err( p_access, "cannot get answer" );
 672         free( psz_line );
 673         if( pi_answer ) *pi_answer    = 500;
 674         if( ppsz_answer ) *ppsz_answer  = NULL;
 675         return -1;
 676     }
 677     msg_Dbg( p_access, "answer=%s", psz_line );
 678
 679     if( psz_line[3] == '-' )    /* Multiple response */
 680     {
 681         char end[4];
 682
 683         memcpy( end, psz_line, 3 );
 684         end[3] = ' ';
 685
 686         for( ;; )
 687         {
 688             char *psz_tmp = net_Gets( p_access, p_sys->fd_cmd, NULL );
 689
 690             if( psz_tmp == NULL )   /* Error */
 691                 break;
 692
 693             if( !strncmp( psz_tmp, end, 4 ) )
 694             {
 695                 free( psz_tmp );
 696                 break;
 697             }
 698             free( psz_tmp );
 699         }
 700     }
 701
 702     i_answer = atoi( psz_line );
 703
 704     if( pi_answer ) *pi_answer = i_answer;
 705     if( ppsz_answer )
 706     {
 707         *ppsz_answer = psz_line;
 708     }
 709     else
 710     {
 711         free( psz_line );
 712     }
 713     return( i_answer / 100 );
 714 }
 715
 716 static int ftp_StartStream( vlc_object_t *p_access, access_sys_t *p_sys,
 717                             uint64_t i_start )
 718 {
 719     char psz_ipv4[16], *psz_ip = p_sys->sz_epsv_ip;
 720     int  i_answer;
 721     char *psz_arg, *psz_parser;
 722     int  i_port;
 723
 724     assert( p_sys->fd_data == -1 );
 725
 726     if( ( ftp_SendCommand( p_access, p_sys, *psz_ip ? "EPSV" : "PASV" ) < 0 )
 727      || ( ftp_ReadCommand( p_access, p_sys, &i_answer, &psz_arg ) != 2 ) )
 728     {
 729         msg_Err( p_access, "cannot set passive mode" );
 730         return VLC_EGENERIC;
 731     }
 732
 733     psz_parser = strchr( psz_arg, '(' );
 734     if( psz_parser == NULL )
 735     {
 736         free( psz_arg );
 737         msg_Err( p_access, "cannot parse passive mode response" );
 738         return VLC_EGENERIC;
 739     }
 740
 741     if( *psz_ip )
 742     {
 743         char psz_fmt[7] = "(|||%u";
 744         psz_fmt[1] = psz_fmt[2] = psz_fmt[3] = psz_parser[1];
 745
 746         if( sscanf( psz_parser, psz_fmt, &i_port ) < 1 )
 747         {
 748             free( psz_arg );
 749             msg_Err( p_access, "cannot parse passive mode response" );
 750             return VLC_EGENERIC;
 751         }
 752     }
 753     else
 754     {
 755         unsigned a1, a2, a3, a4, p1, p2;
 756
 757         if( ( sscanf( psz_parser, "(%u,%u,%u,%u,%u,%u", &a1, &a2, &a3, &a4,
 758                       &p1, &p2 ) < 6 ) || ( a1 > 255 ) || ( a2 > 255 )
 759          || ( a3 > 255 ) || ( a4 > 255 ) || ( p1 > 255 ) || ( p2 > 255 ) )
 760         {
 761             free( psz_arg );
 762             msg_Err( p_access, "cannot parse passive mode response" );
 763             return VLC_EGENERIC;
 764         }
 765
 766         sprintf( psz_ipv4, "%u.%u.%u.%u", a1, a2, a3, a4 );
 767         psz_ip = psz_ipv4;
 768         i_port = (p1 << 8) | p2;
 769     }
 770     free( psz_arg );
 771
 772     msg_Dbg( p_access, "ip:%s port:%d", psz_ip, i_port );
 773
 774     if( ftp_SendCommand( p_access, p_sys, "TYPE I" ) < 0 ||
 775         ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) != 2 )
 776     {
 777         msg_Err( p_access, "cannot set binary transfer mode" );
 778         return VLC_EGENERIC;
 779     }
 780
 781     if( i_start > 0 )
 782     {
 783         if( ftp_SendCommand( p_access, p_sys, "REST %"PRIu64, i_start ) < 0 ||
 784             ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) > 3 )
 785         {
 786             msg_Err( p_access, "cannot set restart offset" );
 787             return VLC_EGENERIC;
 788         }
 789     }
 790
 791     msg_Dbg( p_access, "waiting for data connection..." );
 792     p_sys->fd_data = net_ConnectTCP( p_access, psz_ip, i_port );
 793     if( p_sys->fd_data < 0 )
 794     {
 795         msg_Err( p_access, "failed to connect with server" );
 796         return VLC_EGENERIC;
 797     }
 798     msg_Dbg( p_access, "connection with \"%s:%d\" successful",
 799              psz_ip, i_port );
 800
 801     if( p_sys->directory )
 802     {
 803         if( ftp_SendCommand( p_access, p_sys, "NLST" ) < 0 ||
 804             ftp_ReadCommand( p_access, p_sys, NULL, &psz_arg ) > 2 )
 805         {
 806             msg_Err( p_access, "cannot list directory contents" );
 807         return VLC_EGENERIC;
 808         }
 809     }
 810     else
 811     {
 812         /* "1xx" message */
 813         assert( p_sys->url.psz_path );
 814         if( ftp_SendCommand( p_access, p_sys, "%s %s",
 815                              p_sys->out ? "STOR" : "RETR",
 816                              p_sys->url.psz_path ) < 0
 817          || ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) > 2 )
 818         {
 819             msg_Err( p_access, "cannot retrieve file" );
 820             return VLC_EGENERIC;
 821         }
 822     }
 823
 824     shutdown( p_sys->fd_data, p_sys->out ? SHUT_RD : SHUT_WR );
 825
 826     return VLC_SUCCESS;
 827 }
 828
 829 static int ftp_StopStream ( vlc_object_t *p_access, access_sys_t *p_sys )
 830 {
 831     if( ftp_SendCommand( p_access, p_sys, "ABOR" ) < 0 )
 832     {
 833         msg_Warn( p_access, "cannot abort file" );
 834         if(  p_sys->fd_data > 0 )
 835             net_Close( p_sys->fd_data );
 836         p_sys->fd_data = -1;
 837         return VLC_EGENERIC;
 838     }
 839
 840     if( p_sys->fd_data != -1 )
 841     {
 842         net_Close( p_sys->fd_data );
 843         p_sys->fd_data = -1;
 844         /* Read the final response from RETR/STOR, i.e. 426 or 226 */
 845         ftp_ReadCommand( p_access, p_sys, NULL, NULL );
 846     }
 847     /* Read the response from ABOR, i.e. 226 or 225 */
 848     ftp_ReadCommand( p_access, p_sys, NULL, NULL );
 849
 850     return VLC_SUCCESS;
 851 }