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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:11:47 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:11:47 +0000
commit758f820bcc0f68aeebac1717e537ca13a320b909 (patch)
tree48111ece75cf4f98316848b37a7e26356e00669e /src/mknod.c
parentInitial commit. (diff)
downloadcoreutils-758f820bcc0f68aeebac1717e537ca13a320b909.tar.xz
coreutils-758f820bcc0f68aeebac1717e537ca13a320b909.zip
Adding upstream version 9.1.upstream/9.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/mknod.c')
-rw-r--r--src/mknod.c280
1 files changed, 280 insertions, 0 deletions
diff --git a/src/mknod.c b/src/mknod.c
new file mode 100644
index 0000000..f47c4eb
--- /dev/null
+++ b/src/mknod.c
@@ -0,0 +1,280 @@
+/* mknod -- make special files
+ 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/>. */
+
+/* Written by 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"
+#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;
+ 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);
+ }
+ }
+
+ 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 (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, "") != 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, "") != 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 (set_security_context, 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 (set_security_context, 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;
+}