src/mkfifo.c

   1 /* mkfifo -- make fifo's (named pipes)
   2    Copyright (C) 1990-2013 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 /* David MacKenzie <djm@ai.mit.edu>  */
  18
  19 #include <config.h>
  20 #include <stdio.h>
  21 #include <getopt.h>
  22 #include <sys/types.h>
  23 #include <selinux/selinux.h>
  24
  25 #include "system.h"
  26 #include "error.h"
  27 #include "modechange.h"
  28 #include "quote.h"
  29 #include "smack.h"
  30
  31 /* The official name of this program (e.g., no 'g' prefix).  */
  32 #define PROGRAM_NAME "mkfifo"
  33
  34 #define AUTHORS proper_name ("David MacKenzie")
  35
  36 static struct option const longopts[] =
  37 {
  38   {GETOPT_SELINUX_CONTEXT_OPTION_DECL},
  39   {"mode", required_argument, NULL, 'm'},
  40   {GETOPT_HELP_OPTION_DECL},
  41   {GETOPT_VERSION_OPTION_DECL},
  42   {NULL, 0, NULL, 0}
  43 };
  44
  45 void
  46 usage (int status)
  47 {
  48   if (status != EXIT_SUCCESS)
  49     emit_try_help ();
  50   else
  51     {
  52       printf (_("Usage: %s [OPTION]... NAME...\n"), program_name);
  53       fputs (_("\
  54 Create named pipes (FIFOs) with the given NAMEs.\n\
  55 "), stdout);
  56
  57       emit_mandatory_arg_note ();
  58
  59       fputs (_("\
  60   -m, --mode=MODE    set file permission bits to MODE, not a=rw - umask\n\
  61 "), stdout);
  62       fputs (_("\
  63   -Z, --context=CTX  set the SELinux security context of each NAME to CTX\n\
  64 "), stdout);
  65       fputs (HELP_OPTION_DESCRIPTION, stdout);
  66       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  67       emit_ancillary_info ();
  68     }
  69   exit (status);
  70 }
  71
  72 int
  73 main (int argc, char **argv)
  74 {
  75   mode_t newmode;
  76   char const *specified_mode = NULL;
  77   int exit_status = EXIT_SUCCESS;
  78   int optc;
  79   security_context_t scontext = NULL;
  80
  81   initialize_main (&argc, &argv);
  82   set_program_name (argv[0]);
  83   setlocale (LC_ALL, "");
  84   bindtextdomain (PACKAGE, LOCALEDIR);
  85   textdomain (PACKAGE);
  86
  87   atexit (close_stdout);
  88
  89   while ((optc = getopt_long (argc, argv, "m:Z:", longopts, NULL)) != -1)
  90     {
  91       switch (optc)
  92         {
  93         case 'm':
  94           specified_mode = optarg;
  95           break;
  96         case 'Z':
  97           scontext = optarg;
  98           break;
  99         case_GETOPT_HELP_CHAR;
 100         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 101         default:
 102           usage (EXIT_FAILURE);
 103         }
 104     }
 105
 106   if (optind == argc)
 107     {
 108       error (0, 0, _("missing operand"));
 109       usage (EXIT_FAILURE);
 110     }
 111
 112   if (scontext)
 113     {
 114       int ret = 0;
 115       if (is_smack_enabled ())
 116         ret = smack_set_label_for_self (scontext);
 117       else
 118         ret = setfscreatecon (scontext);
 119
 120       if (ret < 0)
 121         error (EXIT_FAILURE, errno,
 122                _("failed to set default file creation context to %s"),
 123                quote (scontext));
 124     }
 125
 126   newmode = MODE_RW_UGO;
 127   if (specified_mode)
 128     {
 129       mode_t umask_value;
 130       struct mode_change *change = mode_compile (specified_mode);
 131       if (!change)
 132         error (EXIT_FAILURE, 0, _("invalid mode"));
 133       umask_value = umask (0);
 134       umask (umask_value);
 135       newmode = mode_adjust (newmode, false, umask_value, change, NULL);
 136       free (change);
 137       if (newmode & ~S_IRWXUGO)
 138         error (EXIT_FAILURE, 0,
 139                _("mode must specify only file permission bits"));
 140     }
 141
 142   for (; optind < argc; ++optind)
 143     if (mkfifo (argv[optind], newmode) != 0)
 144       {
 145         error (0, errno, _("cannot create fifo %s"), quote (argv[optind]));
 146         exit_status = EXIT_FAILURE;
 147       }
 148     else if (specified_mode && lchmod (argv[optind], newmode) != 0)
 149       {
 150         error (0, errno, _("cannot set permissions of `%s'"),
 151                quote (argv[optind]));
 152         exit_status = EXIT_FAILURE;
 153       }
 154
 155   exit (exit_status);
 156 }