blob: 466ef5c064249c21b714fe472759f96cf4717c77
| 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * mknod implementation for busybox |
| 4 | * |
| 5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org> |
| 6 | * |
| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 8 | */ |
| 9 | //config:config MKNOD |
| 10 | //config: bool "mknod" |
| 11 | //config: default y |
| 12 | //config: help |
| 13 | //config: mknod is used to create FIFOs or block/character special |
| 14 | //config: files with the specified names. |
| 15 | |
| 16 | //applet:IF_MKNOD(APPLET_NOEXEC(mknod, mknod, BB_DIR_BIN, BB_SUID_DROP, mknod)) |
| 17 | |
| 18 | //kbuild:lib-$(CONFIG_MKNOD) += mknod.o |
| 19 | |
| 20 | /* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */ |
| 21 | |
| 22 | //usage:#define mknod_trivial_usage |
| 23 | //usage: "[-m MODE] " IF_SELINUX("[-Z] ") "NAME TYPE MAJOR MINOR" |
| 24 | //usage:#define mknod_full_usage "\n\n" |
| 25 | //usage: "Create a special file (block, character, or pipe)\n" |
| 26 | //usage: "\n -m MODE Creation mode (default a=rw)" |
| 27 | //usage: IF_SELINUX( |
| 28 | //usage: "\n -Z Set security context" |
| 29 | //usage: ) |
| 30 | //usage: "\nTYPE:" |
| 31 | //usage: "\n b Block device" |
| 32 | //usage: "\n c or u Character device" |
| 33 | //usage: "\n p Named pipe (MAJOR and MINOR are ignored)" |
| 34 | //usage: |
| 35 | //usage:#define mknod_example_usage |
| 36 | //usage: "$ mknod /dev/fd0 b 2 0\n" |
| 37 | //usage: "$ mknod -m 644 /tmp/pipe p\n" |
| 38 | |
| 39 | #include <sys/sysmacros.h> // For makedev |
| 40 | |
| 41 | #include "libbb.h" |
| 42 | #include "libcoreutils/coreutils.h" |
| 43 | |
| 44 | /* This is a NOEXEC applet. Be very careful! */ |
| 45 | |
| 46 | static const char modes_chars[] ALIGN1 = { 'p', 'c', 'u', 'b', 0, 1, 1, 2 }; |
| 47 | static const mode_t modes_cubp[] = { S_IFIFO, S_IFCHR, S_IFBLK }; |
| 48 | |
| 49 | int mknod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 50 | int mknod_main(int argc, char **argv) |
| 51 | { |
| 52 | mode_t mode; |
| 53 | dev_t dev; |
| 54 | const char *name; |
| 55 | |
| 56 | mode = getopt_mk_fifo_nod(argv); |
| 57 | argv += optind; |
| 58 | argc -= optind; |
| 59 | |
| 60 | if (argc >= 2) { |
| 61 | name = strchr(modes_chars, argv[1][0]); |
| 62 | if (name != NULL) { |
| 63 | mode |= modes_cubp[(int)(name[4])]; |
| 64 | |
| 65 | dev = 0; |
| 66 | if (*name != 'p') { |
| 67 | argc -= 2; |
| 68 | if (argc == 2) { |
| 69 | /* Autodetect what the system supports; these macros should |
| 70 | * optimize out to two constants. */ |
| 71 | dev = makedev(xatoul_range(argv[2], 0, major(UINT_MAX)), |
| 72 | xatoul_range(argv[3], 0, minor(UINT_MAX))); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | if (argc == 2) { |
| 77 | name = *argv; |
| 78 | if (mknod(name, mode, dev) == 0) { |
| 79 | return EXIT_SUCCESS; |
| 80 | } |
| 81 | bb_simple_perror_msg_and_die(name); |
| 82 | } |
| 83 | } |
| 84 | } |
| 85 | bb_show_usage(); |
| 86 | } |
| 87 |