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- /* mknod -- make special files
- Copyright (C) 1990-2018 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/>. */
- /* Written by David MacKenzie <djm@ai.mit.edu> */
- #include <config.h>
- #include <stdio.h>
- #include <getopt.h>
- #include <sys/types.h>
- #include <selinux/selinux.h>
- #include "system.h"
- #include "die.h"
- #include "error.h"
- #include "modechange.h"
- #include "quote.h"
- #include "selinux.h"
- #include "smack.h"
- #include "xstrtol.h"
- /* The official name of this program (e.g., no 'g' prefix). */
- #define PROGRAM_NAME "mknod"
- #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 TYPE [MAJOR MINOR]\n"),
- program_name);
- fputs (_("\
- Create the special file NAME of the given TYPE.\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);
- fputs (_("\
- \n\
- Both MAJOR and MINOR must be specified when TYPE is b, c, or u, and they\n\
- must be omitted when TYPE is p. If MAJOR or MINOR begins with 0x or 0X,\n\
- it is interpreted as hexadecimal; otherwise, if it begins with 0, as octal;\n\
- otherwise, as decimal. TYPE may be:\n\
- "), stdout);
- fputs (_("\
- \n\
- b create a block (buffered) special file\n\
- c, u create a character (unbuffered) special file\n\
- p create a FIFO\n\
- "), stdout);
- printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME);
- emit_ancillary_info (PROGRAM_NAME);
- }
- exit (status);
- }
- int
- main (int argc, char **argv)
- {
- mode_t newmode;
- char const *specified_mode = NULL;
- int optc;
- size_t expected_operands;
- mode_t node_type;
- char const *scontext = NULL;
- bool set_security_context = false;
- 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 = true;
- }
- 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);
- }
- }
- 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"));
- }
- /* If the number of arguments is 0 or 1,
- or (if it's 2 or more and the second one starts with 'p'), then there
- must be exactly two operands. Otherwise, there must be four. */
- expected_operands = (argc <= optind
- || (optind + 1 < argc && argv[optind + 1][0] == 'p')
- ? 2 : 4);
- if (argc - optind < expected_operands)
- {
- if (argc <= optind)
- error (0, 0, _("missing operand"));
- else
- error (0, 0, _("missing operand after %s"), quote (argv[argc - 1]));
- if (expected_operands == 4 && argc - optind == 2)
- fprintf (stderr, "%s\n",
- _("Special files require major and minor device numbers."));
- usage (EXIT_FAILURE);
- }
- if (expected_operands < argc - optind)
- {
- error (0, 0, _("extra operand %s"),
- quote (argv[optind + expected_operands]));
- if (expected_operands == 2 && argc - optind == 4)
- fprintf (stderr, "%s\n",
- _("Fifos do not have major and minor device numbers."));
- usage (EXIT_FAILURE);
- }
- if (scontext)
- {
- int ret = 0;
- if (is_smack_enabled ())
- ret = smack_set_label_for_self (scontext);
- else
- ret = setfscreatecon (se_const (scontext));
- if (ret < 0)
- die (EXIT_FAILURE, errno,
- _("failed to set default file creation context to %s"),
- quote (scontext));
- }
- /* Only check the first character, to allow mnemonic usage like
- 'mknod /dev/rst0 character 18 0'. */
- switch (argv[optind + 1][0])
- {
- case 'b': /* 'block' or 'buffered' */
- #ifndef S_IFBLK
- die (EXIT_FAILURE, 0, _("block special files not supported"));
- #else
- node_type = S_IFBLK;
- #endif
- goto block_or_character;
- case 'c': /* 'character' */
- case 'u': /* 'unbuffered' */
- #ifndef S_IFCHR
- die (EXIT_FAILURE, 0, _("character special files not supported"));
- #else
- node_type = S_IFCHR;
- #endif
- goto block_or_character;
- block_or_character:
- {
- char const *s_major = argv[optind + 2];
- char const *s_minor = argv[optind + 3];
- uintmax_t i_major, i_minor;
- dev_t device;
- if (xstrtoumax (s_major, NULL, 0, &i_major, NULL) != LONGINT_OK
- || i_major != (major_t) i_major)
- die (EXIT_FAILURE, 0,
- _("invalid major device number %s"), quote (s_major));
- if (xstrtoumax (s_minor, NULL, 0, &i_minor, NULL) != LONGINT_OK
- || i_minor != (minor_t) i_minor)
- die (EXIT_FAILURE, 0,
- _("invalid minor device number %s"), quote (s_minor));
- device = makedev (i_major, i_minor);
- #ifdef NODEV
- if (device == NODEV)
- die (EXIT_FAILURE, 0, _("invalid device %s %s"),
- s_major, s_minor);
- #endif
- if (set_security_context)
- defaultcon (argv[optind], node_type);
- if (mknod (argv[optind], newmode | node_type, device) != 0)
- die (EXIT_FAILURE, errno, "%s", quotef (argv[optind]));
- }
- break;
- case 'p': /* 'pipe' */
- if (set_security_context)
- defaultcon (argv[optind], S_IFIFO);
- if (mkfifo (argv[optind], newmode) != 0)
- die (EXIT_FAILURE, errno, "%s", quotef (argv[optind]));
- break;
- default:
- error (0, 0, _("invalid device type %s"), quote (argv[optind + 1]));
- usage (EXIT_FAILURE);
- }
- if (specified_mode && lchmod (argv[optind], newmode) != 0)
- die (EXIT_FAILURE, errno, _("cannot set permissions of %s"),
- quoteaf (argv[optind]));
- return EXIT_SUCCESS;
- }
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