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/* mkfifo -- make fifo's (named pipes)
Copyright (C) 1990-2020 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* David MacKenzie <djm@ai.mit.edu> */
#include <config.h>
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include <selinux/label.h>
#include "system.h"
#include "die.h"
#include "error.h"
#include "modechange.h"
#include "quote.h"
#include "selinux.h"
#include "smack.h"
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "mkfifo"
#define AUTHORS proper_name ("David MacKenzie")
static struct option const longopts[] =
{
{GETOPT_SELINUX_CONTEXT_OPTION_DECL},
{"mode", required_argument, NULL, 'm'},
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{NULL, 0, NULL, 0}
};
void
usage (int status)
{
if (status != EXIT_SUCCESS)
emit_try_help ();
else
{
printf (_("Usage: %s [OPTION]... NAME...\n"), program_name);
fputs (_("\
Create named pipes (FIFOs) with the given NAMEs.\n\
"), stdout);
emit_mandatory_arg_note ();
fputs (_("\
-m, --mode=MODE set file permission bits to MODE, not a=rw - umask\n\
"), stdout);
fputs (_("\
-Z set the SELinux security context to default type\n\
--context[=CTX] like -Z, or if CTX is specified then set the SELinux\n\
or SMACK security context to CTX\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
emit_ancillary_info (PROGRAM_NAME);
}
exit (status);
}
int
main (int argc, char **argv)
{
mode_t newmode;
char const *specified_mode = NULL;
int exit_status = EXIT_SUCCESS;
int optc;
char const *scontext = NULL;
struct selabel_handle *set_security_context = NULL;
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
while ((optc = getopt_long (argc, argv, "m:Z", longopts, NULL)) != -1)
{
switch (optc)
{
case 'm':
specified_mode = optarg;
break;
case 'Z':
if (is_smack_enabled ())
{
/* We don't yet support -Z to restore context with SMACK. */
scontext = optarg;
}
else if (is_selinux_enabled () > 0)
{
if (optarg)
scontext = optarg;
else
{
set_security_context = selabel_open (SELABEL_CTX_FILE,
NULL, 0);
if (! set_security_context)
error (0, errno, _("warning: ignoring --context"));
}
}
else if (optarg)
{
error (0, 0,
_("warning: ignoring --context; "
"it requires an SELinux/SMACK-enabled kernel"));
}
break;
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
default:
usage (EXIT_FAILURE);
}
}
if (optind == argc)
{
error (0, 0, _("missing operand"));
usage (EXIT_FAILURE);
}
if (scontext)
{
int ret = 0;
if (is_smack_enabled ())
ret = smack_set_label_for_self (scontext);
else
ret = setfscreatecon (scontext);
if (ret < 0)
die (EXIT_FAILURE, errno,
_("failed to set default file creation context to %s"),
quote (scontext));
}
newmode = MODE_RW_UGO;
if (specified_mode)
{
mode_t umask_value;
struct mode_change *change = mode_compile (specified_mode);
if (!change)
die (EXIT_FAILURE, 0, _("invalid mode"));
umask_value = umask (0);
umask (umask_value);
newmode = mode_adjust (newmode, false, umask_value, change, NULL);
free (change);
if (newmode & ~S_IRWXUGO)
die (EXIT_FAILURE, 0,
_("mode must specify only file permission bits"));
}
for (; optind < argc; ++optind)
{
if (set_security_context)
defaultcon (set_security_context, argv[optind], S_IFIFO);
if (mkfifo (argv[optind], newmode) != 0)
{
error (0, errno, _("cannot create fifo %s"), quoteaf (argv[optind]));
exit_status = EXIT_FAILURE;
}
else if (specified_mode && lchmod (argv[optind], newmode) != 0)
{
error (0, errno, _("cannot set permissions of %s"),
quoteaf (argv[optind]));
exit_status = EXIT_FAILURE;
}
}
return exit_status;
}
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