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id.c revision 1.17 
      1 /*-
      2  * Copyright (c) 1991, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 #ifndef lint
     36 __COPYRIGHT("@(#) Copyright (c) 1991, 1993\n\
     37 	The Regents of the University of California.  All rights reserved.\n");
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 #if 0
     42 static char sccsid[] = "@(#)id.c	8.3 (Berkeley) 4/28/95";
     43 #else
     44 __RCSID("$NetBSD: id.c,v 1.17 2001/01/05 03:08:23 itohy Exp $");
     45 #endif
     46 #endif /* not lint */
     47 
     48 #include <sys/param.h>
     49 
     50 #include <err.h>
     51 #include <errno.h>
     52 #include <grp.h>
     53 #include <pwd.h>
     54 #include <stdio.h>
     55 #include <stdlib.h>
     56 #include <string.h>
     57 #include <unistd.h>
     58 
     59 int	main __P((int, char **));
     60 
     61 static void	current __P((void));
     62 static void	pretty __P((struct passwd *));
     63 static void	group __P((struct passwd *, int));
     64 static void	usage __P((void));
     65 static void	user __P((struct passwd *));
     66 static struct passwd *who __P((char *));
     67 
     68 static int maxgroups;
     69 static gid_t *groups;
     70 
     71 int
     72 main(argc, argv)
     73 	int argc;
     74 	char *argv[];
     75 {
     76 	struct group *gr;
     77 	struct passwd *pw;
     78 	int ch, id;
     79 	int Gflag, gflag, nflag, pflag, rflag, uflag;
     80 	extern const char *__progname;
     81 
     82 	Gflag = gflag = nflag = pflag = rflag = uflag = 0;
     83 
     84 	if (!strcmp(__progname, "groups")) {
     85 		Gflag = 1;
     86 		nflag = 1;
     87 	} else if (!strcmp(__progname, "whoami")) {
     88 		uflag = 1;
     89 		nflag = 1;
     90 	}
     91 
     92 	while ((ch = getopt(argc, argv, "Ggnpru")) != -1)
     93 		switch(ch) {
     94 		case 'G':
     95 			Gflag = 1;
     96 			break;
     97 		case 'g':
     98 			gflag = 1;
     99 			break;
    100 		case 'n':
    101 			nflag = 1;
    102 			break;
    103 		case 'p':
    104 			pflag = 1;
    105 			break;
    106 		case 'r':
    107 			rflag = 1;
    108 			break;
    109 		case 'u':
    110 			uflag = 1;
    111 			break;
    112 		case '?':
    113 		default:
    114 			usage();
    115 		}
    116 	argc -= optind;
    117 	argv += optind;
    118 
    119 	switch(Gflag + gflag + pflag + uflag) {
    120 	case 1:
    121 		break;
    122 	case 0:
    123 		if (!nflag && !rflag)
    124 			break;
    125 		/* FALLTHROUGH */
    126 	default:
    127 		usage();
    128 	}
    129 
    130 	pw = *argv ? who(*argv) : NULL;
    131 
    132 	maxgroups = sysconf(_SC_NGROUPS_MAX);
    133 	if ((groups = malloc((maxgroups + 1) * sizeof(gid_t))) == NULL)
    134 		err(1, NULL);
    135 
    136 	if (gflag) {
    137 		id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
    138 		if (nflag && (gr = getgrgid(id)))
    139 			(void)printf("%s\n", gr->gr_name);
    140 		else
    141 			(void)printf("%u\n", id);
    142 		goto done;
    143 	}
    144 
    145 	if (uflag) {
    146 		id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
    147 		if (nflag && (pw = getpwuid(id)))
    148 			(void)printf("%s\n", pw->pw_name);
    149 		else
    150 			(void)printf("%u\n", id);
    151 		goto done;
    152 	}
    153 
    154 	if (Gflag) {
    155 		group(pw, nflag);
    156 		goto done;
    157 	}
    158 
    159 	if (pflag) {
    160 		pretty(pw);
    161 		goto done;
    162 	}
    163 
    164 	if (pw)
    165 		user(pw);
    166 	else
    167 		current();
    168 done:
    169 	free(groups);
    170 	return(0);
    171 }
    172 
    173 static void
    174 pretty(pw)
    175 	struct passwd *pw;
    176 {
    177 	struct group *gr;
    178 	u_int eid, rid;
    179 	char *login;
    180 
    181 	if (pw) {
    182 		(void)printf("uid\t%s\n", pw->pw_name);
    183 		(void)printf("groups\t");
    184 		group(pw, 1);
    185 	} else {
    186 		if ((login = getlogin()) == NULL)
    187 			err(1, "getlogin");
    188 
    189 		pw = getpwuid(rid = getuid());
    190 		if (pw == NULL || strcmp(login, pw->pw_name))
    191 			(void)printf("login\t%s\n", login);
    192 		if (pw)
    193 			(void)printf("uid\t%s\n", pw->pw_name);
    194 		else
    195 			(void)printf("uid\t%u\n", rid);
    196 
    197 		if ((eid = geteuid()) != rid) {
    198 			if ((pw = getpwuid(eid)) != NULL)
    199 				(void)printf("euid\t%s\n", pw->pw_name);
    200 			else
    201 				(void)printf("euid\t%u\n", eid);
    202 		}
    203 		if ((rid = getgid()) != (eid = getegid())) {
    204 			if ((gr = getgrgid(rid)) != NULL)
    205 				(void)printf("rgid\t%s\n", gr->gr_name);
    206 			else
    207 				(void)printf("rgid\t%u\n", rid);
    208 		}
    209 		(void)printf("groups\t");
    210 		group(NULL, 1);
    211 	}
    212 }
    213 
    214 static void
    215 current()
    216 {
    217 	struct group *gr;
    218 	struct passwd *pw;
    219 	int cnt, id, eid, lastid, ngroups;
    220 	char *fmt;
    221 
    222 	id = getuid();
    223 	(void)printf("uid=%u", id);
    224 	if ((pw = getpwuid(id)) != NULL)
    225 		(void)printf("(%s)", pw->pw_name);
    226 	if ((eid = geteuid()) != id) {
    227 		(void)printf(" euid=%u", eid);
    228 		if ((pw = getpwuid(eid)) != NULL)
    229 			(void)printf("(%s)", pw->pw_name);
    230 	}
    231 	id = getgid();
    232 	(void)printf(" gid=%u", id);
    233 	if ((gr = getgrgid(id)) != NULL)
    234 		(void)printf("(%s)", gr->gr_name);
    235 	if ((eid = getegid()) != id) {
    236 		(void)printf(" egid=%u", eid);
    237 		if ((gr = getgrgid(eid)) != NULL)
    238 			(void)printf("(%s)", gr->gr_name);
    239 	}
    240 	if ((ngroups = getgroups(maxgroups, groups)) != NULL) {
    241 		for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups;
    242 		    fmt = ",%u", lastid = id, cnt++) {
    243 			id = groups[cnt];
    244 			if (lastid == id)
    245 				continue;
    246 			(void)printf(fmt, id);
    247 			if ((gr = getgrgid(id)) != NULL)
    248 				(void)printf("(%s)", gr->gr_name);
    249 		}
    250 	}
    251 	(void)printf("\n");
    252 }
    253 
    254 static void
    255 user(pw)
    256 	struct passwd *pw;
    257 {
    258 	struct group *gr;
    259 	char *fmt;
    260 	int cnt, id, lastid, ngroups;
    261 
    262 	id = pw->pw_uid;
    263 	(void)printf("uid=%u(%s)", id, pw->pw_name);
    264 	(void)printf(" gid=%lu", (u_long)pw->pw_gid);
    265 	if ((gr = getgrgid(pw->pw_gid)) != NULL)
    266 		(void)printf("(%s)", gr->gr_name);
    267 	ngroups = maxgroups + 1;
    268 	(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
    269 	for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups;
    270 	    fmt=",%u", lastid = id, cnt++) {
    271 		id = groups[cnt];
    272 		if (lastid == id)
    273 			continue;
    274 		(void)printf(fmt, id);
    275 		if ((gr = getgrgid(id)) != NULL)
    276 			(void)printf("(%s)", gr->gr_name);
    277 	}
    278 	(void)printf("\n");
    279 }
    280 
    281 static void
    282 group(pw, nflag)
    283 	struct passwd *pw;
    284 	int nflag;
    285 {
    286 	struct group *gr;
    287 	int cnt, id, lastid, ngroups;
    288 	char *fmt;
    289 
    290 	if (pw) {
    291 		ngroups = maxgroups;
    292 		(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
    293 	} else {
    294 		groups[0] = getgid();
    295 		ngroups = getgroups(maxgroups, groups + 1) + 1;
    296 	}
    297 	fmt = nflag ? "%s" : "%u";
    298 	for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
    299 		if (lastid == (id = groups[cnt]))
    300 			continue;
    301 		if (nflag) {
    302 			if ((gr = getgrgid(id)) != NULL)
    303 				(void)printf(fmt, gr->gr_name);
    304 			else
    305 				(void)printf(*fmt == ' ' ? " %u" : "%u",
    306 				    id);
    307 			fmt = " %s";
    308 		} else {
    309 			(void)printf(fmt, id);
    310 			fmt = " %u";
    311 		}
    312 		lastid = id;
    313 	}
    314 	(void)printf("\n");
    315 }
    316 
    317 struct passwd *
    318 who(u)
    319 	char *u;
    320 {
    321 	struct passwd *pw;
    322 	long id;
    323 	char *ep;
    324 
    325 	/*
    326 	 * Translate user argument into a pw pointer.  First, try to
    327 	 * get it as specified.  If that fails, try it as a number.
    328 	 */
    329 	if ((pw = getpwnam(u)) != NULL)
    330 		return(pw);
    331 	id = strtol(u, &ep, 10);
    332 	if (*u && !*ep && (pw = getpwuid(id)))
    333 		return(pw);
    334 	errx(1, "%s: No such user", u);
    335 	/* NOTREACHED */
    336 	return (NULL);
    337 }
    338 
    339 void
    340 usage()
    341 {
    342 	(void)fprintf(stderr, "usage: id [user]\n");
    343 	(void)fprintf(stderr, "       id -G [-n] [user]\n");
    344 	(void)fprintf(stderr, "       id -g [-nr] [user]\n");
    345 	(void)fprintf(stderr, "       id -p\n");
    346 	(void)fprintf(stderr, "       id -u [-nr] [user]\n");
    347 	exit(1);
    348 }
    349