| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini id implementation for busybox |
| * |
| * Copyright (C) 2000 by Randolph Chung <tausq@debian.org> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| */ |
| |
| /* BB_AUDIT SUSv3 _NOT_ compliant -- option -G is not currently supported. */ |
| /* Hacked by Tito Ragusa (C) 2004 to handle usernames of whatever length and to |
| * be more similar to GNU id. |
| */ |
| |
| #include "busybox.h" |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| |
| #ifdef CONFIG_SELINUX |
| #include <selinux/selinux.h> /* for is_selinux_enabled() */ |
| #endif |
| |
| #define PRINT_REAL 1 |
| #define NAME_NOT_NUMBER 2 |
| #define JUST_USER 4 |
| #define JUST_GROUP 8 |
| |
| static short printf_full(unsigned int id, const char *arg, const char prefix) |
| { |
| const char *fmt = "%cid=%u"; |
| short status = EXIT_FAILURE; |
| |
| if (arg) { |
| fmt = "%cid=%u(%s)"; |
| status = EXIT_SUCCESS; |
| } |
| printf(fmt, prefix, id, arg); |
| return status; |
| } |
| |
| int id_main(int argc, char **argv) |
| { |
| struct passwd *p; |
| uid_t uid; |
| gid_t gid; |
| unsigned long flags; |
| short status; |
| |
| /* Don't allow -n -r -nr -ug -rug -nug -rnug */ |
| /* Don't allow more than one username */ |
| opt_complementary = "?1:?:u--g:g--u:r?ug:n?ug"; |
| flags = getopt32(argc, argv, "rnug"); |
| |
| /* This values could be overwritten later */ |
| uid = geteuid(); |
| gid = getegid(); |
| if (flags & PRINT_REAL) { |
| uid = getuid(); |
| gid = getgid(); |
| } |
| |
| if (argv[optind]) { |
| p = getpwnam(argv[optind]); |
| /* xuname2uid is needed because it exits on failure */ |
| uid = xuname2uid(argv[optind]); |
| gid = p->pw_gid; |
| /* in this case PRINT_REAL is the same */ |
| } |
| |
| if (flags & (JUST_GROUP | JUST_USER)) { |
| /* JUST_GROUP and JUST_USER are mutually exclusive */ |
| if (flags & NAME_NOT_NUMBER) { |
| /* bb_getpwuid and bb_getgrgid exit on failure so puts cannot segfault */ |
| puts((flags & JUST_USER) ? bb_getpwuid(NULL, uid, -1 ) : bb_getgrgid(NULL, gid, -1 )); |
| } else { |
| printf("%u\n", (flags & JUST_USER) ? uid : gid); |
| } |
| /* exit */ |
| fflush_stdout_and_exit(EXIT_SUCCESS); |
| } |
| |
| /* Print full info like GNU id */ |
| /* bb_getpwuid doesn't exit on failure here */ |
| status = printf_full(uid, bb_getpwuid(NULL, uid, 0), 'u'); |
| putchar(' '); |
| /* bb_getgrgid doesn't exit on failure here */ |
| status |= printf_full(gid, bb_getgrgid(NULL, gid, 0), 'g'); |
| |
| #ifdef CONFIG_SELINUX |
| if (is_selinux_enabled()) { |
| security_context_t mysid; |
| char context[80]; |
| int len = sizeof(context); |
| |
| getcon(&mysid); |
| context[0] = '\0'; |
| if (mysid) { |
| len = strlen(mysid)+1; |
| safe_strncpy(context, mysid, len); |
| freecon(mysid); |
| } else { |
| safe_strncpy(context, "unknown", 8); |
| } |
| printf(" context=%s", context); |
| } |
| #endif |
| |
| putchar('\n'); |
| fflush_stdout_and_exit(status); |
| } |