1 /* id -- print real and effective UIDs and GIDs
2 Copyright (C) 1989, 1991 Free Software Foundation.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
18 /* Written by Arnold Robbins, arnold@audiofax.com.
19 Major rewrite by David MacKenzie, djm@gnu.ai.mit.edu. */
22 #if defined (CONFIG_BROKETS)
23 /* We use <config.h> instead of "config.h" so that a compilation
24 using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
25 (which it would do because it found this file in $srcdir). */
34 #include <sys/types.h>
44 #if !defined(NGROUPS_MAX) || NGROUPS_MAX < 1
45 #define NGROUPS_MAX sysconf (_SC_NGROUPS_MAX)
46 #endif /* !NGROUPS_MAX */
48 #else /* not _POSIX_VERSION */
49 struct passwd *getpwuid ();
50 struct group *getgrgid ();
55 #include <sys/param.h>
56 #if !defined(NGROUPS_MAX) && defined(NGROUPS)
57 #define NGROUPS_MAX NGROUPS
58 #endif /* not NGROUPS_MAX and NGROUPS */
59 #endif /* not _POSIX_VERSION */
65 static void print_user ();
66 static void print_group ();
67 static void print_group_list ();
68 static void print_full_info ();
71 /* The name this program was run with. */
74 /* If nonzero, output only the group ID(s). -g */
75 static int just_group = 0;
77 /* If nonzero, output user/group name instead of ID number. -n */
78 static int use_name = 0;
80 /* If nonzero, output real UID/GID instead of default effective UID/GID. -r */
81 static int use_real = 0;
83 /* If nonzero, output only the user ID(s). -u */
84 static int just_user = 0;
86 /* If nonzero, output only the supplementary groups. -G */
87 static int just_group_list = 0;
89 /* The real and effective IDs of the user to print. */
90 static uid_t ruid, euid;
91 static gid_t rgid, egid;
93 /* The number of errors encountered so far. */
94 static int problems = 0;
96 /* If non-zero, display usage information and exit. */
99 /* If non-zero, print the version on standard output and exit. */
100 static int show_version;
102 static struct option const longopts[] =
104 {"group", no_argument, NULL, 'g'},
105 {"groups", no_argument, NULL, 'G'},
106 {"help", no_argument, &show_help, 1},
107 {"name", no_argument, NULL, 'n'},
108 {"real", no_argument, NULL, 'r'},
109 {"user", no_argument, NULL, 'u'},
110 {"version", no_argument, &show_version, 1},
121 program_name = argv[0];
123 while ((optc = getopt_long (argc, argv, "gnruG", longopts, (int *) 0))
152 printf ("%s\n", version_string);
159 if (just_user + just_group + just_group_list > 1)
160 error (1, 0, "cannot print only user and only group");
162 if (just_user + just_group + just_group_list == 0 && (use_real || use_name))
163 error (1, 0, "cannot print only names or real IDs in default format");
165 if (argc - optind > 1)
168 if (argc - optind == 1)
170 struct passwd *pwd = getpwnam (argv[optind]);
172 error (1, 0, "%s: No such user", argv[optind]);
173 ruid = euid = pwd->pw_uid;
174 rgid = egid = pwd->pw_gid;
185 print_user (use_real ? ruid : euid);
187 print_group (use_real ? rgid : egid);
188 else if (just_group_list)
189 print_group_list (argv[optind]);
191 print_full_info (argv[optind]);
194 exit (problems != 0);
197 /* Print the name or value of user ID UID. */
203 struct passwd *pwd = NULL;
207 pwd = getpwuid (uid);
213 printf ("%u", (unsigned) uid);
215 printf ("%s", pwd->pw_name);
218 /* Print the name or value of group ID GID. */
224 struct group *grp = NULL;
228 grp = getgrgid (gid);
234 printf ("%u", (unsigned) gid);
236 printf ("%s", grp->gr_name);
239 /* Print all of the distinct groups the user is in . */
242 print_group_list (username)
258 groups = (GETGROUPS_T *) xmalloc (NGROUPS_MAX * sizeof (GETGROUPS_T));
260 ngroups = getgroups (NGROUPS_MAX, groups);
262 ngroups = getugroups (NGROUPS_MAX, groups, username);
265 error (0, errno, "cannot get supplemental group list");
271 for (i = 0; i < ngroups; i++)
272 if (groups[i] != rgid && groups[i] != egid)
275 print_group (groups[i]);
282 /* Print all of the info about the user's user and group IDs. */
285 print_full_info (username)
291 printf ("uid=%u", (unsigned) ruid);
292 pwd = getpwuid (ruid);
296 printf ("(%s)", pwd->pw_name);
298 printf (" gid=%u", (unsigned) rgid);
299 grp = getgrgid (rgid);
303 printf ("(%s)", grp->gr_name);
307 printf (" euid=%u", (unsigned) euid);
308 pwd = getpwuid (euid);
312 printf ("(%s)", pwd->pw_name);
317 printf (" egid=%u", (unsigned) egid);
318 grp = getgrgid (egid);
322 printf ("(%s)", grp->gr_name);
331 groups = (GETGROUPS_T *) xmalloc (NGROUPS_MAX * sizeof (GETGROUPS_T));
333 ngroups = getgroups (NGROUPS_MAX, groups);
335 ngroups = getugroups (NGROUPS_MAX, groups, username);
338 error (0, errno, "cannot get supplemental group list");
345 fputs (" groups=", stdout);
346 for (i = 0; i < ngroups; i++)
350 printf ("%u", (unsigned) groups[i]);
351 grp = getgrgid (groups[i]);
355 printf ("(%s)", grp->gr_name);
366 fprintf (status == 0 ? stdout : stderr, "\
367 Usage: %s [OPTION]... [USERNAME]\n\
372 fprintf (stderr, "Try `%s --help' for more information.\n",
378 -g, --group print only the group ID\n\
379 -n, --name print a name instead of a number, for -ugG\n\
380 -r, --real print the real ID instead of effective ID, for -ugG\n\
381 -u, --user print only the user ID\n\
382 -G, --groups print only the supplementary groups\n\
383 --help display this help and exit\n\
384 --version output version information and exit\n\
386 Without any OPTION, print some useful set of identified information.\n\