send_file-linux.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 <sys/sendfile.h>
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24
  25
  26 /*
  27  * RETR command implementation usin Linux sendfile() to minimize memory copies.
  28  * Due to the nature of the system call, it is not even necessary to perform the
  29  * initial seek in case a REST command was issued.
  30  */
  31 void send_file (void)
  32 {
  33         int    f, l, e;
  34         off_t  size, completed;
  35
  36         completed      = SS.file_offset;
  37         SS.file_offset = 0;
  38
  39         f = open_file(&size);
  40         if (f == -1)
  41                 return;
  42
  43         e = open_data_channel();
  44         if (e == -1)
  45         {
  46                 close(f);
  47                 return;
  48         }
  49
  50         reply_c("150 Sending file content.\r\n");
  51
  52         /* Main transfer loop */
  53         while (completed < size && e != -1)
  54         {
  55                 debug("Offset is %lld", (long long) completed);
  56                 e = sendfile(SS.data_sk, f, &completed, INT_MAX);
  57         }
  58
  59         if (e != -1)
  60                 reply_c("226 File content sent.\r\n");
  61         else
  62         {
  63                 error("Sending file %s", SS.aux);
  64                 reply_c("426 Connection closed, transfer aborted.\r\n");
  65         }
  66
  67         close(f);
  68         closesocket(SS.data_sk);
  69         SS.data_sk = -1;
  70 }
  71