src/mkfifo.c

   1 /* mkfifo -- make fifo's (named pipes)
   2    Copyright (C) 1990-2016 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 "selinux.h"
  30 #include "smack.h"
  31
  32 /* The official name of this program (e.g., no 'g' prefix).  */
  33 #define PROGRAM_NAME "mkfifo"
  34
  35 #define AUTHORS proper_name ("David MacKenzie")
  36
  37 static struct option const longopts[] =
  38 {
  39   {GETOPT_SELINUX_CONTEXT_OPTION_DECL},
  40   {"mode", required_argument, NULL, 'm'},
  41   {GETOPT_HELP_OPTION_DECL},
  42   {GETOPT_VERSION_OPTION_DECL},
  43   {NULL, 0, NULL, 0}
  44 };
  45
  46 void
  47 usage (int status)
  48 {
  49   if (status != EXIT_SUCCESS)
  50     emit_try_help ();
  51   else
  52     {
  53       printf (_("Usage: %s [OPTION]... NAME...\n"), program_name);
  54       fputs (_("\
  55 Create named pipes (FIFOs) with the given NAMEs.\n\
  56 "), stdout);
  57
  58       emit_mandatory_arg_note ();
  59
  60       fputs (_("\
  61   -m, --mode=MODE    set file permission bits to MODE, not a=rw - umask\n\
  62 "), stdout);
  63       fputs (_("\
  64   -Z                   set the SELinux security context to default type\n\
  65       --context[=CTX]  like -Z, or if CTX is specified then set the SELinux\n\
  66                          or SMACK security context to CTX\n\
  67 "), stdout);
  68       fputs (HELP_OPTION_DESCRIPTION, stdout);
  69       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  70       emit_ancillary_info (PROGRAM_NAME);
  71     }
  72   exit (status);
  73 }
  74
  75 int
  76 main (int argc, char **argv)
  77 {
  78   mode_t newmode;
  79   char const *specified_mode = NULL;
  80   int exit_status = EXIT_SUCCESS;
  81   int optc;
  82   char const *scontext = NULL;
  83   bool set_security_context = false;
  84
  85   initialize_main (&argc, &argv);
  86   set_program_name (argv[0]);
  87   setlocale (LC_ALL, "");
  88   bindtextdomain (PACKAGE, LOCALEDIR);
  89   textdomain (PACKAGE);
  90
  91   atexit (close_stdout);
  92
  93   while ((optc = getopt_long (argc, argv, "m:Z", longopts, NULL)) != -1)
  94     {
  95       switch (optc)
  96         {
  97         case 'm':
  98           specified_mode = optarg;
  99           break;
 100         case 'Z':
 101           if (is_smack_enabled ())
 102             {
 103               /* We don't yet support -Z to restore context with SMACK.  */
 104               scontext = optarg;
 105             }
 106           else if (is_selinux_enabled () > 0)
 107             {
 108               if (optarg)
 109                 scontext = optarg;
 110               else
 111                 set_security_context = true;
 112             }
 113           else if (optarg)
 114             {
 115               error (0, 0,
 116                      _("warning: ignoring --context; "
 117                        "it requires an SELinux/SMACK-enabled kernel"));
 118             }
 119           break;
 120         case_GETOPT_HELP_CHAR;
 121         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 122         default:
 123           usage (EXIT_FAILURE);
 124         }
 125     }
 126
 127   if (optind == argc)
 128     {
 129       error (0, 0, _("missing operand"));
 130       usage (EXIT_FAILURE);
 131     }
 132
 133   if (scontext)
 134     {
 135       int ret = 0;
 136       if (is_smack_enabled ())
 137         ret = smack_set_label_for_self (scontext);
 138       else
 139         ret = setfscreatecon (se_const (scontext));
 140
 141       if (ret < 0)
 142         error (EXIT_FAILURE, errno,
 143                _("failed to set default file creation context to %s"),
 144                quote (scontext));
 145     }
 146
 147   newmode = MODE_RW_UGO;
 148   if (specified_mode)
 149     {
 150       mode_t umask_value;
 151       struct mode_change *change = mode_compile (specified_mode);
 152       if (!change)
 153         error (EXIT_FAILURE, 0, _("invalid mode"));
 154       umask_value = umask (0);
 155       umask (umask_value);
 156       newmode = mode_adjust (newmode, false, umask_value, change, NULL);
 157       free (change);
 158       if (newmode & ~S_IRWXUGO)
 159         error (EXIT_FAILURE, 0,
 160                _("mode must specify only file permission bits"));
 161     }
 162
 163   for (; optind < argc; ++optind)
 164     {
 165       if (set_security_context)
 166         defaultcon (argv[optind], S_IFIFO);
 167       if (mkfifo (argv[optind], newmode) != 0)
 168         {
 169           error (0, errno, _("cannot create fifo %s"), quoteaf (argv[optind]));
 170           exit_status = EXIT_FAILURE;
 171         }
 172       else if (specified_mode && lchmod (argv[optind], newmode) != 0)
 173         {
 174           error (0, errno, _("cannot set permissions of %s"),
 175                  quoteaf (argv[optind]));
 176           exit_status = EXIT_FAILURE;
 177         }
 178     }
 179
 180   return exit_status;
 181 }