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Diffstat (limited to 'src/mkfifo.c')
| -rw-r--r-- | src/mkfifo.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/mkfifo.c b/src/mkfifo.c new file mode 100644 index 0000000..85c7050 --- /dev/null +++ b/src/mkfifo.c @@ -0,0 +1,187 @@ +/* mkfifo -- make fifo's (named pipes) + Copyright (C) 1990-2022 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; +} |