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 CACHING_TEXT N_("Caching value in ms")
  59 #define CACHING_LONGTEXT N_( \
  60     "Caching value for FTP streams. This " \
  61     "value should be set in milliseconds." )
  62 #define USER_TEXT N_("FTP user name")
  63 #define USER_LONGTEXT N_("User name that will " \
  64     "be used for the connection.")
  65 #define PASS_TEXT N_("FTP password")
  66 #define PASS_LONGTEXT N_("Password that will be " \
  67     "used for the connection.")
  68 #define ACCOUNT_TEXT N_("FTP account")
  69 #define ACCOUNT_LONGTEXT N_("Account that will be " \
  70     "used for the connection.")
  71
  72 vlc_module_begin ()
  73     set_shortname( "FTP" )
  74     set_description( N_("FTP input") )
  75     set_capability( "access", 0 )
  76     set_category( CAT_INPUT )
  77     set_subcategory( SUBCAT_INPUT_ACCESS )
  78     add_integer( "ftp-caching", 2 * DEFAULT_PTS_DELAY / 1000, NULL,
  79                  CACHING_TEXT, CACHING_LONGTEXT, true )
  80         change_safe()
  81     add_string( "ftp-user", "anonymous", USER_TEXT, USER_LONGTEXT,
  82                 false )
  83     add_string( "ftp-pwd", "anonymous@example.com", PASS_TEXT,
  84                 PASS_LONGTEXT, false )
  85     add_string( "ftp-account", "anonymous", ACCOUNT_TEXT,
  86                 ACCOUNT_LONGTEXT, false )
  87     add_shortcut( "ftp" )
  88     set_callbacks( InOpen, InClose )
  89
  90     add_submodule ()
  91         set_shortname( "FTP" )
  92         set_description( N_("FTP upload output") )
  93         set_capability( "sout access", 0 )
  94         set_category( CAT_SOUT )
  95         set_subcategory( SUBCAT_SOUT_ACO )
  96         add_shortcut( "ftp" )
  97         set_callbacks( OutOpen, OutClose )
  98 vlc_module_end ()
  99
 100 /*****************************************************************************
 101  * Local prototypes
 102  *****************************************************************************/
 103 static ssize_t Read( access_t *, uint8_t *, size_t );
 104 static ssize_t Write( sout_access_out_t *, block_t * );
 105 static int Seek( access_t *, uint64_t );
 106 static int OutSeek( sout_access_out_t *, off_t );
 107 static int Control( access_t *, int, va_list );
 108
 109 struct access_sys_t
 110 {
 111     vlc_url_t  url;
 112
 113     int        fd_cmd;
 114     int        fd_data;
 115
 116     char       sz_epsv_ip[NI_MAXNUMERICHOST];
 117     bool       out;
 118     bool       directory;
 119 };
 120 #define GET_OUT_SYS( p_this ) \
 121     ((access_sys_t *)(((sout_access_out_t *)(p_this))->p_sys))
 122
 123 static int ftp_SendCommand( vlc_object_t *, access_sys_t *, const char *, ... );
 124 static int ftp_ReadCommand( vlc_object_t *, access_sys_t *, int *, char ** );
 125 static int ftp_StartStream( vlc_object_t *, access_sys_t *, uint64_t );
 126 static int ftp_StopStream ( vlc_object_t *, access_sys_t * );
 127
 128 static int Login( vlc_object_t *p_access, access_sys_t *p_sys )
 129 {
 130     int i_answer;
 131     char *psz;
 132
 133     /* *** Open a TCP connection with server *** */
 134     int fd = p_sys->fd_cmd = net_ConnectTCP( p_access, p_sys->url.psz_host,
 135                                              p_sys->url.i_port );
 136     if( fd == -1 )
 137     {
 138         msg_Err( p_access, "connection failed" );
 139         dialog_Fatal( p_access, _("Network interaction failed"), "%s",
 140                         _("VLC could not connect with the given server.") );
 141         return -1;
 142     }
 143
 144     while( ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) == 1 );
 145
 146     if( i_answer / 100 != 2 )
 147     {
 148         msg_Err( p_access, "connection rejected" );
 149         dialog_Fatal( p_access, _("Network interaction failed"), "%s",
 150                         _("VLC's connection to the given server was rejected.") );
 151         return -1;
 152     }
 153
 154     msg_Dbg( p_access, "connection accepted (%d)", i_answer );
 155
 156     if( p_sys->url.psz_username && *p_sys->url.psz_username )
 157         psz = strdup( p_sys->url.psz_username );
 158     else
 159         psz = var_InheritString( p_access, "ftp-user" );
 160     if( !psz )
 161         return -1;
 162
 163     if( ftp_SendCommand( p_access, p_sys, "USER %s", psz ) < 0 ||
 164         ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) < 0 )
 165     {
 166         free( psz );
 167         return -1;
 168     }
 169     free( psz );
 170
 171     switch( i_answer / 100 )
 172     {
 173         case 2:
 174             msg_Dbg( p_access, "user accepted" );
 175             break;
 176         case 3:
 177             msg_Dbg( p_access, "password needed" );
 178             if( p_sys->url.psz_password && *p_sys->url.psz_password )
 179                 psz = strdup( p_sys->url.psz_password );
 180             else
 181                 psz = var_InheritString( p_access, "ftp-pwd" );
 182             if( !psz )
 183                 return -1;
 184
 185             if( ftp_SendCommand( p_access, p_sys, "PASS %s", psz ) < 0 ||
 186                 ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) < 0 )
 187             {
 188                 free( psz );
 189                 return -1;
 190             }
 191             free( psz );
 192
 193             switch( i_answer / 100 )
 194             {
 195                 case 2:
 196                     msg_Dbg( p_access, "password accepted" );
 197                     break;
 198                 case 3:
 199                     msg_Dbg( p_access, "account needed" );
 200                     psz = var_InheritString( p_access, "ftp-account" );
 201                     if( ftp_SendCommand( p_access, p_sys, "ACCT %s",
 202                                          psz ) < 0 ||
 203                         ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) < 0 )
 204                     {
 205                         free( psz );
 206                         return -1;
 207                     }
 208                     free( psz );
 209
 210                     if( i_answer / 100 != 2 )
 211                     {
 212                         msg_Err( p_access, "account rejected" );
 213                         dialog_Fatal( p_access,
 214                                       _("Network interaction failed"),
 215                                       "%s", _("Your account was rejected.") );
 216                         return -1;
 217                     }
 218                     msg_Dbg( p_access, "account accepted" );
 219                     break;
 220
 221                 default:
 222                     msg_Err( p_access, "password rejected" );
 223                     dialog_Fatal( p_access, _("Network interaction failed"),
 224                                   "%s",  _("Your password was rejected.") );
 225                     return -1;
 226             }
 227             break;
 228         default:
 229             msg_Err( p_access, "user rejected" );
 230             dialog_Fatal( p_access, _("Network interaction failed"), "%s",
 231                         _("Your connection attempt to the server was rejected.") );
 232             return -1;
 233     }
 234
 235     return 0;
 236 }
 237
 238 static int Connect( vlc_object_t *p_access, access_sys_t *p_sys )
 239 {
 240     if( Login( p_access, p_sys ) < 0 )
 241         return -1;
 242
 243     /* Extended passive mode */
 244     if( ftp_SendCommand( p_access, p_sys, "EPSV ALL" ) < 0 )
 245     {
 246         msg_Err( p_access, "cannot request extended passive mode" );
 247         net_Close( p_sys->fd_cmd );
 248         return -1;
 249     }
 250
 251     if( ftp_ReadCommand( p_access, p_sys, NULL, NULL ) == 2 )
 252     {
 253         if( net_GetPeerAddress( p_sys->fd_cmd, p_sys->sz_epsv_ip, NULL ) )
 254         {
 255             net_Close( p_sys->fd_cmd );
 256             return -1;
 257         }
 258     }
 259     else
 260     {
 261         /* If ESPV ALL fails, we fallback to PASV.
 262          * We have to restart the connection in case there is a NAT that
 263          * understands EPSV ALL in the way, and hence won't allow PASV on
 264          * the initial connection.
 265          */
 266         msg_Info( p_access, "FTP Extended passive mode disabled" );
 267         net_Close( p_sys->fd_cmd );
 268
 269         if( Login( p_access, p_sys ) )
 270         {
 271             net_Close( p_sys->fd_cmd );
 272             return -1;
 273         }
 274     }
 275
 276     /* check binary mode support */
 277     if( ftp_SendCommand( p_access, p_sys, "TYPE I" ) < 0 ||
 278         ftp_ReadCommand( p_access, p_sys, NULL, NULL ) != 2 )
 279     {
 280         msg_Err( p_access, "cannot set binary transfer mode" );
 281         net_Close( p_sys->fd_cmd );
 282         return -1;
 283     }
 284
 285     return 0;
 286 }
 287
 288
 289 static int parseURL( vlc_url_t *url, const char *path )
 290 {
 291     if( path == NULL )
 292         return VLC_EGENERIC;
 293
 294     /* *** Parse URL and get server addr/port and path *** */
 295     while( *path == '/' )
 296         path++;
 297
 298     vlc_UrlParse( url, path, 0 );
 299
 300     if( url->psz_host == NULL || *url->psz_host == '\0' )
 301         return VLC_EGENERIC;
 302
 303     if( url->i_port <= 0 )
 304         url->i_port = IPPORT_FTP; /* default port */
 305
 306     if( url->psz_path == NULL )
 307         return VLC_SUCCESS;
 308     /* FTP URLs are relative to user's default directory (RFC1738 §3.2)
 309     For absolute path use ftp://foo.bar//usr/local/etc/filename */
 310     /* FIXME: we should issue a series of CWD, one per slash */
 311     if( url->psz_path )
 312     {
 313         assert( url->psz_path[0] == '/' );
 314         url->psz_path++;
 315     }
 316
 317     char *type = strstr( url->psz_path, ";type=" );
 318     if( type )
 319     {
 320         *type = '\0';
 321         if( strchr( "iI", type[6] ) == NULL )
 322             return VLC_EGENERIC; /* ASCII and directory not supported */
 323     }
 324     decode_URI( url->psz_path );
 325     /* FIXME: check for UTF-8 support, otherwise only ASCII is allowed */
 326     EnsureUTF8( url->psz_path );
 327     return VLC_SUCCESS;
 328 }
 329
 330
 331 /****************************************************************************
 332  * Open: connect to ftp server and ask for file
 333  ****************************************************************************/
 334 static int InOpen( vlc_object_t *p_this )
 335 {
 336     access_t     *p_access = (access_t*)p_this;
 337     access_sys_t *p_sys;
 338     char         *psz_arg;
 339
 340     /* Init p_access */
 341     STANDARD_READ_ACCESS_INIT
 342     p_sys->fd_data = -1;
 343     p_sys->out = false;
 344     p_sys->directory = false;
 345
 346     if( parseURL( &p_sys->url, p_access->psz_location ) )
 347         goto exit_error;
 348
 349     if( Connect( p_this, p_sys ) )
 350         goto exit_error;
 351
 352     /* get size */
 353     if( p_sys->url.psz_path == NULL )
 354         p_sys->directory = true;
 355     else
 356     if( ftp_SendCommand( p_this, p_sys, "SIZE %s", p_sys->url.psz_path ) < 0 )
 357         goto error;
 358     else
 359     if ( ftp_ReadCommand( p_this, p_sys, NULL, &psz_arg ) == 2 )
 360     {
 361         p_access->info.i_size = atoll( &psz_arg[4] );
 362         free( psz_arg );
 363         msg_Dbg( p_access, "file size: %"PRIu64, p_access->info.i_size );
 364     }
 365     else
 366     if( ftp_SendCommand( p_this, p_sys, "CWD %s", p_sys->url.psz_path ) < 0 )
 367         goto error;
 368     else
 369     if( ftp_ReadCommand( p_this, p_sys, NULL, NULL ) != 2 )
 370     {
 371         msg_Err( p_access, "file or directory does not exist" );
 372         goto error;
 373     }
 374     else
 375         p_sys->directory = true;
 376
 377     /* Start the 'stream' */
 378     if( ftp_StartStream( p_this, p_sys, 0 ) < 0 )
 379     {
 380         msg_Err( p_access, "cannot retrieve file" );
 381         net_Close( p_sys->fd_cmd );
 382         goto exit_error;
 383     }
 384
 385     /* Update default_pts to a suitable value for ftp access */
 386     var_Create( p_access, "ftp-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 387
 388     return VLC_SUCCESS;
 389
 390 error:
 391     net_Close( p_sys->fd_cmd );
 392 exit_error:
 393     vlc_UrlClean( &p_sys->url );
 394     free( p_sys );
 395     return VLC_EGENERIC;
 396 }
 397
 398 static int OutOpen( vlc_object_t *p_this )
 399 {
 400     sout_access_out_t *p_access = (sout_access_out_t *)p_this;
 401     access_sys_t      *p_sys;
 402
 403     p_sys = calloc( 1, sizeof( *p_sys ) );
 404     if( !p_sys )
 405         return VLC_ENOMEM;
 406
 407     /* Init p_access */
 408     p_sys->fd_data = -1;
 409     p_sys->out = true;
 410
 411     if( parseURL( &p_sys->url, p_access->psz_path ) )
 412         goto exit_error;
 413     if( p_sys->url.psz_path == NULL )
 414     {
 415         msg_Err( p_this, "no filename specified" );
 416         goto exit_error;
 417     }
 418
 419     if( Connect( p_this, p_sys ) )
 420         goto exit_error;
 421
 422     /* Start the 'stream' */
 423     if( ftp_StartStream( p_this, p_sys, 0 ) < 0 )
 424     {
 425         msg_Err( p_access, "cannot store file" );
 426         net_Close( p_sys->fd_cmd );
 427         goto exit_error;
 428     }
 429
 430     p_access->pf_seek = OutSeek;
 431     p_access->pf_write = Write;
 432     p_access->p_sys = (void *)p_sys;
 433
 434     return VLC_SUCCESS;
 435
 436 exit_error:
 437     vlc_UrlClean( &p_sys->url );
 438     free( p_sys );
 439     return VLC_EGENERIC;
 440 }
 441
 442 /*****************************************************************************
 443  * Close: free unused data structures
 444  *****************************************************************************/
 445 static void Close( vlc_object_t *p_access, access_sys_t *p_sys )
 446 {
 447     msg_Dbg( p_access, "stopping stream" );
 448     ftp_StopStream( p_access, p_sys );
 449
 450     if( ftp_SendCommand( p_access, p_sys, "QUIT" ) < 0 )
 451     {
 452         msg_Warn( p_access, "cannot quit" );
 453     }
 454     else
 455     {
 456         ftp_ReadCommand( p_access, p_sys, NULL, NULL );
 457     }
 458     net_Close( p_sys->fd_cmd );
 459
 460     /* free memory */
 461     vlc_UrlClean( &p_sys->url );
 462     free( p_sys );
 463 }
 464
 465 static void InClose( vlc_object_t *p_this )
 466 {
 467     Close( p_this, ((access_t *)p_this)->p_sys);
 468 }
 469
 470 static void OutClose( vlc_object_t *p_this )
 471 {
 472     Close( p_this, GET_OUT_SYS(p_this));
 473 }
 474
 475
 476 /*****************************************************************************
 477  * Seek: try to go at the right place
 478  *****************************************************************************/
 479 static int _Seek( vlc_object_t *p_access, access_sys_t *p_sys, uint64_t i_pos )
 480 {
 481     msg_Dbg( p_access, "seeking to %"PRIu64, i_pos );
 482
 483     ftp_StopStream( (vlc_object_t *)p_access, p_sys );
 484     if( ftp_StartStream( (vlc_object_t *)p_access, p_sys, i_pos ) < 0 )
 485         return VLC_EGENERIC;
 486
 487     return VLC_SUCCESS;
 488 }
 489
 490 static int Seek( access_t *p_access, uint64_t i_pos )
 491 {
 492     int val = _Seek( (vlc_object_t *)p_access, p_access->p_sys, i_pos );
 493     if( val )
 494         return val;
 495
 496     p_access->info.b_eof = false;
 497     p_access->info.i_pos = i_pos;
 498
 499     return VLC_SUCCESS;
 500 }
 501
 502 static int OutSeek( sout_access_out_t *p_access, off_t i_pos )
 503 {
 504     return _Seek( (vlc_object_t *)p_access, GET_OUT_SYS( p_access ), i_pos);
 505 }
 506
 507 /*****************************************************************************
 508  * Read:
 509  *****************************************************************************/
 510 static ssize_t Read( access_t *p_access, uint8_t *p_buffer, size_t i_len )
 511 {
 512     access_sys_t *p_sys = p_access->p_sys;
 513
 514     assert( p_sys->fd_data != -1 );
 515     assert( !p_sys->out );
 516
 517     if( p_access->info.b_eof )
 518         return 0;
 519
 520     if( p_sys->directory )
 521     {
 522         char *psz_line = net_Gets( p_access, p_sys->fd_data, NULL );
 523         if( !psz_line )
 524         {
 525             p_access->info.b_eof = true;
 526             return 0;
 527         }
 528         else
 529         {
 530             snprintf( (char*)p_buffer, i_len, "ftp://%s:%d/%s/%s\n",
 531                       p_sys->url.psz_host, p_sys->url.i_port,
 532                       p_sys->url.psz_path, psz_line );
 533             free( psz_line );
 534             return strlen( (const char *)p_buffer );
 535         }
 536     }
 537     else
 538     {
 539         int i_read = net_Read( p_access, p_sys->fd_data, NULL,
 540                                p_buffer, i_len, false );
 541         if( i_read == 0 )
 542             p_access->info.b_eof = true;
 543         else if( i_read > 0 )
 544             p_access->info.i_pos += i_read;
 545
 546         return i_read;
 547     }
 548 }
 549
 550 /*****************************************************************************
 551  * Write:
 552  *****************************************************************************/
 553 static ssize_t Write( sout_access_out_t *p_access, block_t *p_buffer )
 554 {
 555     access_sys_t *p_sys = GET_OUT_SYS(p_access);
 556     size_t i_write = 0;
 557
 558     assert( p_sys->fd_data != -1 );
 559
 560     while( p_buffer != NULL )
 561     {
 562         block_t *p_next = p_buffer->p_next;;
 563
 564         i_write += net_Write( p_access, p_sys->fd_data, NULL,
 565                               p_buffer->p_buffer, p_buffer->i_buffer );
 566         block_Release( p_buffer );
 567
 568         p_buffer = p_next;
 569     }
 570
 571     return i_write;
 572 }
 573
 574 /*****************************************************************************
 575  * Control:
 576  *****************************************************************************/
 577 static int Control( access_t *p_access, int i_query, va_list args )
 578 {
 579     bool    *pb_bool;
 580     int64_t *pi_64;
 581
 582     switch( i_query )
 583     {
 584         /* */
 585         case ACCESS_CAN_SEEK:
 586             pb_bool = (bool*)va_arg( args, bool* );
 587             *pb_bool = !p_access->p_sys->directory;
 588             break;
 589         case ACCESS_CAN_FASTSEEK:
 590             pb_bool = (bool*)va_arg( args, bool* );
 591             *pb_bool = false;
 592             break;
 593         case ACCESS_CAN_PAUSE:
 594             pb_bool = (bool*)va_arg( args, bool* );
 595             *pb_bool = true;    /* FIXME */
 596             break;
 597         case ACCESS_CAN_CONTROL_PACE:
 598             pb_bool = (bool*)va_arg( args, bool* );
 599             *pb_bool = true;    /* FIXME */
 600             break;
 601
 602         /* */
 603         case ACCESS_GET_PTS_DELAY:
 604             pi_64 = (int64_t*)va_arg( args, int64_t * );
 605             *pi_64 = var_GetInteger( p_access, "ftp-caching" ) * INT64_C(1000);
 606             break;
 607
 608         /* */
 609         case ACCESS_SET_PAUSE_STATE:
 610             pb_bool = (bool*)va_arg( args, bool* );
 611             if ( !pb_bool )
 612               return Seek( p_access, p_access->info.i_pos );
 613             break;
 614
 615         case ACCESS_GET_TITLE_INFO:
 616         case ACCESS_SET_TITLE:
 617         case ACCESS_SET_SEEKPOINT:
 618         case ACCESS_SET_PRIVATE_ID_STATE:
 619         case ACCESS_GET_CONTENT_TYPE:
 620         case ACCESS_GET_META:
 621             return VLC_EGENERIC;
 622
 623         default:
 624             msg_Warn( p_access, "unimplemented query in control: %d", i_query);
 625             return VLC_EGENERIC;
 626
 627     }
 628     return VLC_SUCCESS;
 629 }
 630
 631 /*****************************************************************************
 632  * ftp_*:
 633  *****************************************************************************/
 634 static int ftp_SendCommand( vlc_object_t *p_access, access_sys_t *p_sys,
 635                             const char *psz_fmt, ... )
 636 {
 637     va_list      args;
 638     char         *psz_cmd;
 639
 640     va_start( args, psz_fmt );
 641     if( vasprintf( &psz_cmd, psz_fmt, args ) == -1 )
 642         return VLC_EGENERIC;
 643
 644     va_end( args );
 645
 646     msg_Dbg( p_access, "ftp_SendCommand:\"%s\"", psz_cmd);
 647
 648     if( net_Printf( p_access, p_sys->fd_cmd, NULL, "%s\r\n", psz_cmd ) < 0 )
 649     {
 650         msg_Err( p_access, "failed to send command" );
 651         return VLC_EGENERIC;
 652     }
 653     return VLC_SUCCESS;
 654 }
 655
 656 /* TODO support this s**t :
 657  RFC 959 allows the client to send certain TELNET strings at any moment,
 658  even in the middle of a request:
 659
 660  * \377\377.
 661  * \377\376x where x is one byte.
 662  * \377\375x where x is one byte. The server is obliged to send \377\374x
 663  *                                immediately after reading x.
 664  * \377\374x where x is one byte.
 665  * \377\373x where x is one byte. The server is obliged to send \377\376x
 666  *                                immediately after reading x.
 667  * \377x for any other byte x.
 668
 669  These strings are not part of the requests, except in the case \377\377,
 670  where the request contains one \377. */
 671 static int ftp_ReadCommand( vlc_object_t *p_access, access_sys_t *p_sys,
 672                             int *pi_answer, char **ppsz_answer )
 673 {
 674     char         *psz_line;
 675     int          i_answer;
 676
 677     psz_line = net_Gets( p_access, p_sys->fd_cmd, NULL );
 678     if( psz_line == NULL || strlen( psz_line ) < 3 )
 679     {
 680         msg_Err( p_access, "cannot get answer" );
 681         free( psz_line );
 682         if( pi_answer ) *pi_answer    = 500;
 683         if( ppsz_answer ) *ppsz_answer  = NULL;
 684         return -1;
 685     }
 686     msg_Dbg( p_access, "answer=%s", psz_line );
 687
 688     if( psz_line[3] == '-' )    /* Multiple response */
 689     {
 690         char end[4];
 691
 692         memcpy( end, psz_line, 3 );
 693         end[3] = ' ';
 694
 695         for( ;; )
 696         {
 697             char *psz_tmp = net_Gets( p_access, p_sys->fd_cmd, NULL );
 698
 699             if( psz_tmp == NULL )   /* Error */
 700                 break;
 701
 702             if( !strncmp( psz_tmp, end, 4 ) )
 703             {
 704                 free( psz_tmp );
 705                 break;
 706             }
 707             free( psz_tmp );
 708         }
 709     }
 710
 711     i_answer = atoi( psz_line );
 712
 713     if( pi_answer ) *pi_answer = i_answer;
 714     if( ppsz_answer )
 715     {
 716         *ppsz_answer = psz_line;
 717     }
 718     else
 719     {
 720         free( psz_line );
 721     }
 722     return( i_answer / 100 );
 723 }
 724
 725 static int ftp_StartStream( vlc_object_t *p_access, access_sys_t *p_sys,
 726                             uint64_t i_start )
 727 {
 728     char psz_ipv4[16], *psz_ip = p_sys->sz_epsv_ip;
 729     int  i_answer;
 730     char *psz_arg, *psz_parser;
 731     int  i_port;
 732
 733     assert( p_sys->fd_data == -1 );
 734
 735     if( ( ftp_SendCommand( p_access, p_sys, *psz_ip ? "EPSV" : "PASV" ) < 0 )
 736      || ( ftp_ReadCommand( p_access, p_sys, &i_answer, &psz_arg ) != 2 ) )
 737     {
 738         msg_Err( p_access, "cannot set passive mode" );
 739         return VLC_EGENERIC;
 740     }
 741
 742     psz_parser = strchr( psz_arg, '(' );
 743     if( psz_parser == NULL )
 744     {
 745         free( psz_arg );
 746         msg_Err( p_access, "cannot parse passive mode response" );
 747         return VLC_EGENERIC;
 748     }
 749
 750     if( *psz_ip )
 751     {
 752         char psz_fmt[7] = "(|||%u";
 753         psz_fmt[1] = psz_fmt[2] = psz_fmt[3] = psz_parser[1];
 754
 755         if( sscanf( psz_parser, psz_fmt, &i_port ) < 1 )
 756         {
 757             free( psz_arg );
 758             msg_Err( p_access, "cannot parse passive mode response" );
 759             return VLC_EGENERIC;
 760         }
 761     }
 762     else
 763     {
 764         unsigned a1, a2, a3, a4, p1, p2;
 765
 766         if( ( sscanf( psz_parser, "(%u,%u,%u,%u,%u,%u", &a1, &a2, &a3, &a4,
 767                       &p1, &p2 ) < 6 ) || ( a1 > 255 ) || ( a2 > 255 )
 768          || ( a3 > 255 ) || ( a4 > 255 ) || ( p1 > 255 ) || ( p2 > 255 ) )
 769         {
 770             free( psz_arg );
 771             msg_Err( p_access, "cannot parse passive mode response" );
 772             return VLC_EGENERIC;
 773         }
 774
 775         sprintf( psz_ipv4, "%u.%u.%u.%u", a1, a2, a3, a4 );
 776         psz_ip = psz_ipv4;
 777         i_port = (p1 << 8) | p2;
 778     }
 779     free( psz_arg );
 780
 781     msg_Dbg( p_access, "ip:%s port:%d", psz_ip, i_port );
 782
 783     if( ftp_SendCommand( p_access, p_sys, "TYPE I" ) < 0 ||
 784         ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) != 2 )
 785     {
 786         msg_Err( p_access, "cannot set binary transfer mode" );
 787         return VLC_EGENERIC;
 788     }
 789
 790     if( i_start > 0 )
 791     {
 792         if( ftp_SendCommand( p_access, p_sys, "REST %"PRIu64, i_start ) < 0 ||
 793             ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) > 3 )
 794         {
 795             msg_Err( p_access, "cannot set restart offset" );
 796             return VLC_EGENERIC;
 797         }
 798     }
 799
 800     msg_Dbg( p_access, "waiting for data connection..." );
 801     p_sys->fd_data = net_ConnectTCP( p_access, psz_ip, i_port );
 802     if( p_sys->fd_data < 0 )
 803     {
 804         msg_Err( p_access, "failed to connect with server" );
 805         return VLC_EGENERIC;
 806     }
 807     msg_Dbg( p_access, "connection with \"%s:%d\" successful",
 808              psz_ip, i_port );
 809
 810     if( p_sys->directory )
 811     {
 812         if( ftp_SendCommand( p_access, p_sys, "NLST" ) < 0 ||
 813             ftp_ReadCommand( p_access, p_sys, NULL, &psz_arg ) > 2 )
 814         {
 815             msg_Err( p_access, "cannot list directory contents" );
 816         return VLC_EGENERIC;
 817         }
 818     }
 819     else
 820     {
 821         /* "1xx" message */
 822         assert( p_sys->url.psz_path );
 823         if( ftp_SendCommand( p_access, p_sys, "%s %s",
 824                              p_sys->out ? "STOR" : "RETR",
 825                              p_sys->url.psz_path ) < 0
 826          || ftp_ReadCommand( p_access, p_sys, &i_answer, NULL ) > 2 )
 827         {
 828             msg_Err( p_access, "cannot retrieve file" );
 829             return VLC_EGENERIC;
 830         }
 831     }
 832
 833     shutdown( p_sys->fd_data, p_sys->out ? SHUT_RD : SHUT_WR );
 834
 835     return VLC_SUCCESS;
 836 }
 837
 838 static int ftp_StopStream ( vlc_object_t *p_access, access_sys_t *p_sys )
 839 {
 840     if( ftp_SendCommand( p_access, p_sys, "ABOR" ) < 0 )
 841     {
 842         msg_Warn( p_access, "cannot abort file" );
 843         if(  p_sys->fd_data > 0 )
 844             net_Close( p_sys->fd_data );
 845         p_sys->fd_data = -1;
 846         return VLC_EGENERIC;
 847     }
 848
 849     if( p_sys->fd_data != -1 )
 850     {
 851         net_Close( p_sys->fd_data );
 852         p_sys->fd_data = -1;
 853         /* Read the final response from RETR/STOR, i.e. 426 or 226 */
 854         ftp_ReadCommand( p_access, p_sys, NULL, NULL );
 855     }
 856     /* Read the response from ABOR, i.e. 226 or 225 */
 857     ftp_ReadCommand( p_access, p_sys, NULL, NULL );
 858
 859     return VLC_SUCCESS;
 860 }