send_file-generic.c

   1 /*
   2  * User FTP Server,  Share folders over FTP without being root.
   3  * Copyright (C) 2008  Isaac Jurado
   4  *
   5  * This program is free software; you can redistribute it and/or modify it under
   6  * the terms of the GNU General Public License as published by the Free Software
   7  * Foundation; either version 2 of the License, or (at your option) any later
   8  * version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  12  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  13  * details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  18  */
  19
  20 #include "uftps.h"
  21 #include <unistd.h>
  22 #include <fcntl.h>
  23
  24 /*
  25  * Generic RETR command implementation.
  26  */
  27 void send_file (void)
  28 {
  29         int    f, b, e;
  30         off_t  size, progress = 0;
  31
  32         f = open_file(&size);
  33         if (f == -1)
  34                 return;
  35
  36         /* Apply a possible previous REST command */
  37         if (SS.file_offset > 0)
  38         {
  39                 progress = lseek(f, SS.file_offset, SEEK_SET);
  40                 if (progress == -1)
  41                 {
  42                         error("Seeking file %s", SS.arg);
  43                         reply_c("450 Could not restart transfer.\r\n");
  44                         close(f);
  45                         return;
  46                 }
  47         }
  48
  49         e = open_data_channel();
  50         if (e == -1)
  51         {
  52                 close(f);
  53                 return;
  54         }
  55
  56         reply_c("150 Sending file content.\r\n");
  57
  58         /*
  59          * Main transfer loop.  We use the auxiliary buffer to temporarily store
  60          * chunks of file.
  61          */
  62         while (progress < size)
  63         {
  64                 b = read(f, SS.aux, LINE_SIZE);
  65                 if (b == -1)
  66                         break;  /* Cannot show a useful error message here */
  67
  68                 e = data_reply(SS.aux, b);
  69                 if (e == -1)
  70                         break;
  71
  72                 progress += b;
  73         }
  74
  75         if (b != -1 && e != -1)
  76                 reply_c("226 File content sent.\r\n");
  77         else
  78                 reply_c("426 Something happened, transfer aborted.\r\n");
  79
  80         close(f);
  81         close(SS.data_sk);
  82         SS.data_sk     = -1;
  83         SS.file_offset = 0;
  84 }
  85