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109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini id implementation for busybox
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*
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* Copyright (C) 2000 by Randolph Chung <tausq@debian.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* BB_AUDIT SUSv3 _NOT_ compliant -- option -G is not currently supported. */
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/* Hacked by Tito Ragusa (C) 2004 to handle usernames of whatever length and to
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* be more similar to GNU id.
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*/
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#include "busybox.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#ifdef CONFIG_SELINUX
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#include <selinux/selinux.h> /* for is_selinux_enabled() */
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#endif
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#define PRINT_REAL 1
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#define NAME_NOT_NUMBER 2
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#define JUST_USER 4
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#define JUST_GROUP 8
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static short printf_full(unsigned int id, const char *arg, const char prefix)
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{
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const char *fmt = "%cid=%u";
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short status = EXIT_FAILURE;
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if (arg) {
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fmt = "%cid=%u(%s)";
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status = EXIT_SUCCESS;
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}
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printf(fmt, prefix, id, arg);
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return status;
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}
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int id_main(int argc, char **argv)
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{
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struct passwd *p;
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uid_t uid;
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gid_t gid;
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unsigned long flags;
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short status;
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/* Don't allow -n -r -nr -ug -rug -nug -rnug */
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/* Don't allow more than one username */
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opt_complementary = "?1:?:u--g:g--u:r?ug:n?ug";
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flags = getopt32(argc, argv, "rnug");
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/* This values could be overwritten later */
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uid = geteuid();
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gid = getegid();
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if (flags & PRINT_REAL) {
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uid = getuid();
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gid = getgid();
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}
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if (argv[optind]) {
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p = getpwnam(argv[optind]);
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/* xuname2uid is needed because it exits on failure */
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uid = xuname2uid(argv[optind]);
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gid = p->pw_gid;
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/* in this case PRINT_REAL is the same */
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}
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if (flags & (JUST_GROUP | JUST_USER)) {
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/* JUST_GROUP and JUST_USER are mutually exclusive */
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if (flags & NAME_NOT_NUMBER) {
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/* bb_getpwuid and bb_getgrgid exit on failure so puts cannot segfault */
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puts((flags & JUST_USER) ? bb_getpwuid(NULL, uid, -1 ) : bb_getgrgid(NULL, gid, -1 ));
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} else {
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printf("%u\n", (flags & JUST_USER) ? uid : gid);
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}
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/* exit */
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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/* Print full info like GNU id */
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/* bb_getpwuid doesn't exit on failure here */
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status = printf_full(uid, bb_getpwuid(NULL, uid, 0), 'u');
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putchar(' ');
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/* bb_getgrgid doesn't exit on failure here */
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status |= printf_full(gid, bb_getgrgid(NULL, gid, 0), 'g');
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#ifdef CONFIG_SELINUX
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if (is_selinux_enabled()) {
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security_context_t mysid;
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const char *context;
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context = "unknown";
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getcon(&mysid);
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if (mysid) {
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context = alloca(strlen(mysid) + 1);
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strcpy((char*)context, mysid);
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freecon(mysid);
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}
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printf(" context=%s", context);
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}
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#endif
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putchar('\n');
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fflush_stdout_and_exit(status);
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}
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