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405afbd551
Add a simple uuidgen utility that generates RFC 4122 compliant UUIDs (version 4, random). Uses the existing generate_uuid() function from libbb and volume_id_set_uuid() for formatting. Implementation suggested by Ulli. Features: - Generates standard format UUIDs: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx - RFC 4122 version 4 compliant - Minimal implementation (~1.1 kb) - NOFORK applet for efficiency - Uses existing volume_id infrastructure for UUID formatting function old new delta uuidgen_main - 71 +71 applet_names 2862 2870 +8 .rodata 107010 107016 +6 applet_main 1648 1652 +4 applet_suid 103 104 +1 applet_install_loc 206 207 +1 applet_flags 103 104 +1 packed_usage 35952 35941 -11 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 6/1 up/down: 92/-11) Total: 81 bytes Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini uuidgen implementation for busybox
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config UUIDGEN
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//config: bool "uuidgen (1.1 kb)"
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//config: default y
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//config: help
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//config: Generate a UUID (Universally Unique Identifier) in RFC 4122 format.
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//applet:IF_UUIDGEN(APPLET_NOFORK(uuidgen, uuidgen, BB_DIR_USR_BIN, BB_SUID_DROP, uuidgen))
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//kbuild:lib-$(CONFIG_UUIDGEN) += uuidgen.o
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//usage:#define uuidgen_trivial_usage
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//usage: ""
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//usage:#define uuidgen_full_usage "\n\n"
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//usage: "Generate a random UUID"
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/* util-linux 2.41.1:
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* -r, --random generate random-based uuid
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* -t, --time generate time-based uuid
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* -n, --namespace <ns> generate hash-based uuid in this namespace
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* available namespaces: @dns @url @oid @x500
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* -N, --name <name> generate hash-based uuid from this name
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* -m, --md5 generate md5 hash
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* -C, --count <num> generate more uuids in loop
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* -s, --sha1 generate sha1 hash
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* -6, --time-v6 generate time-based v6 uuid
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* -7, --time-v7 generate time-based v7 uuid
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* -x, --hex interpret name as hex string
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* manpage:
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* "By default uuidgen will generate a random-based UUID if a high-quality random number generator is present.
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* Otherwise, it will choose a time-based UUID."
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*/
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#include "libbb.h"
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#include "volume_id/volume_id_internal.h"
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/* This is a NOFORK applet. Be very careful! */
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int uuidgen_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int uuidgen_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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{
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struct volume_id id;
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uint8_t uuid[16];
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/* support/ignore -r (--random) */
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getopt32(argv, "^" "r" "\0" "=0"/* no args!*/);
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generate_uuid(uuid);
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volume_id_set_uuid(&id, uuid, UUID_DCE);
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puts(id.uuid);
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return 0;
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}
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