313 lines
9.1 KiB
C
313 lines
9.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* public domain -- Dave 'Kill a Cop' Cinege <dcinege@psychosis.com>
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*
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* makedevs
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* Make ranges of device files quickly.
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* known bugs: can't deal with alpha ranges
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*/
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//config:config MAKEDEVS
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//config: bool "makedevs (9.3 kb)"
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//config: default y
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//config: help
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//config: 'makedevs' is a utility used to create a batch of devices with
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//config: one command.
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//config:
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//config: There are two choices for command line behaviour, the interface
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//config: as used by LEAF/Linux Router Project, or a device table file.
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//config:
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//config: 'leaf' is traditionally what busybox follows, it allows multiple
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//config: devices of a particluar type to be created per command.
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//config: e.g. /dev/hda[0-9]
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//config: Device properties are passed as command line arguments.
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//config:
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//config: 'table' reads device properties from a file or stdin, allowing
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//config: a batch of unrelated devices to be made with one command.
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//config: User/group names are allowed as an alternative to uid/gid.
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//config:
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//config:choice
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//config: prompt "Choose makedevs behaviour"
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//config: depends on MAKEDEVS
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//config: default FEATURE_MAKEDEVS_TABLE
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//config:
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//config:config FEATURE_MAKEDEVS_LEAF
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//config: bool "leaf"
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//config:
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//config:config FEATURE_MAKEDEVS_TABLE
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//config: bool "table"
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//config:
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//config:endchoice
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//applet:IF_MAKEDEVS(APPLET(makedevs, BB_DIR_SBIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_MAKEDEVS) += makedevs.o
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//usage:#if ENABLE_FEATURE_MAKEDEVS_LEAF
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//usage:#define makedevs_trivial_usage
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//usage: "NAME TYPE MAJOR MINOR FIRST LAST [s]"
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//usage:#define makedevs_full_usage "\n\n"
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//usage: "Create a range of block or character special files"
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//usage: "\n"
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//usage: "\nTYPE is:"
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//usage: "\n b Block device"
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//usage: "\n c Character device"
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//usage: "\n f FIFO, MAJOR and MINOR are ignored"
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//usage: "\n"
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//usage: "\nFIRST..LAST specify numbers appended to NAME."
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//usage: "\nIf 's' is the last argument, the base device is created as well."
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//usage: "\n"
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//usage: "\nExamples:"
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//usage: "\n makedevs /dev/ttyS c 4 66 2 63 -> ttyS2-ttyS63"
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//usage: "\n makedevs /dev/hda b 3 0 0 8 s -> hda,hda1-hda8"
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//usage:
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//usage:#define makedevs_example_usage
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//usage: "# makedevs /dev/ttyS c 4 66 2 63\n"
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//usage: "[creates ttyS2-ttyS63]\n"
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//usage: "# makedevs /dev/hda b 3 0 0 8 s\n"
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//usage: "[creates hda,hda1-hda8]\n"
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//usage:#endif
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//usage:
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//usage:#if ENABLE_FEATURE_MAKEDEVS_TABLE
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//usage:#define makedevs_trivial_usage
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//usage: "[-d device_table] rootdir"
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//usage:#define makedevs_full_usage "\n\n"
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//usage: "Create a range of special files as specified in a device table.\n"
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//usage: "Device table entries take the form of:\n"
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//usage: "<name> <type> <mode> <uid> <gid> <major> <minor> <start> <inc> <count>\n"
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//usage: "Where name is the file name, type can be one of:\n"
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//usage: " f Regular file\n"
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//usage: " d Directory\n"
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//usage: " c Character device\n"
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//usage: " b Block device\n"
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//usage: " p Fifo (named pipe)\n"
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//usage: "uid is the user id for the target file, gid is the group id for the\n"
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//usage: "target file. The rest of the entries (major, minor, etc) apply to\n"
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//usage: "to device special files. A '-' may be used for blank entries."
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//usage:
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//usage:#define makedevs_example_usage
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//usage: "For example:\n"
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//usage: "<name> <type> <mode><uid><gid><major><minor><start><inc><count>\n"
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//usage: "/dev d 755 0 0 - - - - -\n"
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//usage: "/dev/console c 666 0 0 5 1 - - -\n"
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//usage: "/dev/null c 666 0 0 1 3 0 0 -\n"
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//usage: "/dev/zero c 666 0 0 1 5 0 0 -\n"
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//usage: "/dev/hda b 640 0 0 3 0 0 0 -\n"
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//usage: "/dev/hda b 640 0 0 3 1 1 1 15\n\n"
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//usage: "Will Produce:\n"
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//usage: "/dev\n"
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//usage: "/dev/console\n"
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//usage: "/dev/null\n"
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//usage: "/dev/zero\n"
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//usage: "/dev/hda\n"
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//usage: "/dev/hda[0-15]\n"
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//usage:#endif
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#include "libbb.h"
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#if ENABLE_FEATURE_MAKEDEVS_LEAF
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/*
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makedevs NAME TYPE MAJOR MINOR FIRST LAST [s]
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TYPEs:
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b Block device
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c Character device
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f FIFO
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FIRST..LAST specify numbers appended to NAME.
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If 's' is the last argument, the base device is created as well.
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Examples:
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makedevs /dev/ttyS c 4 66 2 63 -> ttyS2-ttyS63
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makedevs /dev/hda b 3 0 0 8 s -> hda,hda1-hda8
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*/
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int makedevs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int makedevs_main(int argc, char **argv)
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{
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mode_t mode;
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char *basedev, *type, *nodname, *buf;
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int Smajor, Sminor, S, E;
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if (argc < 7 || argv[1][0] == '-')
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bb_show_usage();
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basedev = argv[1];
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buf = xasprintf("%s%u", argv[1], (unsigned)-1);
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type = argv[2];
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Smajor = xatoi_positive(argv[3]);
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Sminor = xatoi_positive(argv[4]);
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S = xatoi_positive(argv[5]);
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E = xatoi_positive(argv[6]);
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nodname = argv[7] ? basedev : buf;
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mode = 0660;
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switch (type[0]) {
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case 'c':
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mode |= S_IFCHR;
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break;
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case 'b':
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mode |= S_IFBLK;
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break;
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case 'f':
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mode |= S_IFIFO;
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break;
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default:
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bb_show_usage();
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}
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while (S <= E) {
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sprintf(buf, "%s%u", basedev, S);
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/* if mode != S_IFCHR and != S_IFBLK,
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* third param in mknod() ignored */
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if (mknod(nodname, mode, makedev(Smajor, Sminor)) != 0
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&& errno != EEXIST
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) {
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bb_perror_msg("can't create '%s'", nodname);
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}
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/*if (nodname == basedev)*/ /* ex. /dev/hda - to /dev/hda1 ... */
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nodname = buf;
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S++;
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Sminor++;
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}
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return 0;
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}
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#elif ENABLE_FEATURE_MAKEDEVS_TABLE
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/* Licensed under GPLv2 or later, see file LICENSE in this source tree. */
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int makedevs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int makedevs_main(int argc UNUSED_PARAM, char **argv)
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{
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parser_t *parser;
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char *line = (char *)"-";
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int ret = EXIT_SUCCESS;
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opt_complementary = "=1"; /* exactly one param */
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getopt32(argv, "d:", &line);
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argv += optind;
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xchdir(*argv); /* ensure root dir exists */
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umask(0);
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printf("rootdir=%s\ntable=", *argv);
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if (NOT_LONE_DASH(line)) {
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printf("'%s'\n", line);
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} else {
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puts("<stdin>");
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}
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parser = config_open(line);
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while (config_read(parser, &line, 1, 1, "# \t", PARSE_NORMAL)) {
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int linenum;
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char type;
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unsigned mode = 0755;
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unsigned major = 0;
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unsigned minor = 0;
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unsigned count = 0;
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unsigned increment = 0;
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unsigned start = 0;
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char user[41];
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char group[41];
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char *full_name;
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int name_len;
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uid_t uid;
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gid_t gid;
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linenum = parser->lineno;
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if ((1 > sscanf(line, "%*s%n %c %o %40s %40s %u %u %u %u %u",
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&name_len, &type, &mode, user, group,
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&major, &minor, &start, &increment, &count))
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|| ((unsigned)(major | minor | start | count | increment) > 255)
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) {
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bb_error_msg("invalid line %d: '%s'", linenum, line);
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ret = EXIT_FAILURE;
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continue;
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}
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gid = (*group) ? get_ug_id(group, xgroup2gid) : getgid();
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uid = (*user) ? get_ug_id(user, xuname2uid) : getuid();
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line[name_len] = '\0';
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full_name = line;
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/* We are already in the right root dir,
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* so make absolute paths relative */
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if ('/' == full_name[0])
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full_name++;
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if (type == 'd') {
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bb_make_directory(full_name, mode | S_IFDIR, FILEUTILS_RECUR);
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if (chown(full_name, uid, gid) == -1) {
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chown_fail:
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bb_perror_msg("line %d: can't chown %s", linenum, full_name);
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ret = EXIT_FAILURE;
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continue;
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}
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if (chmod(full_name, mode) < 0) {
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chmod_fail:
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bb_perror_msg("line %d: can't chmod %s", linenum, full_name);
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ret = EXIT_FAILURE;
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continue;
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}
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} else if (type == 'f') {
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struct stat st;
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if ((stat(full_name, &st) < 0 || !S_ISREG(st.st_mode))) {
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bb_perror_msg("line %d: regular file '%s' does not exist", linenum, full_name);
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ret = EXIT_FAILURE;
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continue;
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}
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if (chown(full_name, uid, gid) < 0)
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goto chown_fail;
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if (chmod(full_name, mode) < 0)
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goto chmod_fail;
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} else {
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unsigned i;
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if (type == 'p') {
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mode |= S_IFIFO;
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} else if (type == 'c') {
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mode |= S_IFCHR;
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} else if (type == 'b') {
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mode |= S_IFBLK;
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} else {
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bb_error_msg("line %d: unsupported file type %c", linenum, type);
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ret = EXIT_FAILURE;
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continue;
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}
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if (count != 0)
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count--;
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for (i = 0; i <= count; i++) {
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dev_t rdev;
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char *nameN = full_name;
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if (count != 0)
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nameN = xasprintf("%s%u", full_name, start + i);
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rdev = makedev(major, minor + i * increment);
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if (mknod(nameN, mode, rdev) != 0
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&& errno != EEXIST
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) {
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bb_perror_msg("line %d: can't create node %s", linenum, nameN);
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ret = EXIT_FAILURE;
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} else if (chown(nameN, uid, gid) < 0) {
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bb_perror_msg("line %d: can't chown %s", linenum, nameN);
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ret = EXIT_FAILURE;
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} else if (chmod(nameN, mode) < 0) {
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bb_perror_msg("line %d: can't chmod %s", linenum, nameN);
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ret = EXIT_FAILURE;
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}
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if (count != 0)
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free(nameN);
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}
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}
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}
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if (ENABLE_FEATURE_CLEAN_UP)
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config_close(parser);
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return ret;
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}
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#else
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# error makedevs configuration error, either leaf or table must be selected
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#endif
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