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id.c revision 1.5 
      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 #ifndef lint
     35 static char copyright[] =
     36 "@(#) 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 /* from: static char sccsid[] = "@(#)id.c	8.2 (Berkeley) 2/16/94"; */
     42 static char *rcsid = "$Id: id.c,v 1.5 1994/05/05 23:24:47 cgd Exp $";
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 
     47 #include <errno.h>
     48 #include <grp.h>
     49 #include <pwd.h>
     50 #include <stdio.h>
     51 #include <stdlib.h>
     52 #include <string.h>
     53 #include <unistd.h>
     54 
     55 void	current __P((void));
     56 void	err __P((const char *, ...));
     57 void	pretty __P((struct passwd *));
     58 void	group __P((struct passwd *, int));
     59 void	usage __P((void));
     60 void	user __P((struct passwd *));
     61 struct passwd *
     62 	who __P((char *));
     63 
     64 int
     65 main(argc, argv)
     66 	int argc;
     67 	char *argv[];
     68 {
     69 	struct group *gr;
     70 	struct passwd *pw;
     71 	int Gflag, ch, gflag, id, nflag, pflag, rflag, uflag;
     72 
     73 	Gflag = gflag = nflag = pflag = rflag = uflag = 0;
     74 	while ((ch = getopt(argc, argv, "Ggnpru")) != EOF)
     75 		switch(ch) {
     76 		case 'G':
     77 			Gflag = 1;
     78 			break;
     79 		case 'g':
     80 			gflag = 1;
     81 			break;
     82 		case 'n':
     83 			nflag = 1;
     84 			break;
     85 		case 'p':
     86 			pflag = 1;
     87 			break;
     88 		case 'r':
     89 			rflag = 1;
     90 			break;
     91 		case 'u':
     92 			uflag = 1;
     93 			break;
     94 		case '?':
     95 		default:
     96 			usage();
     97 		}
     98 	argc -= optind;
     99 	argv += optind;
    100 
    101 	switch(Gflag + gflag + pflag + uflag) {
    102 	case 1:
    103 		break;
    104 	case 0:
    105 		if (!nflag && !rflag)
    106 			break;
    107 		/* FALLTHROUGH */
    108 	default:
    109 		usage();
    110 	}
    111 
    112 	pw = *argv ? who(*argv) : NULL;
    113 
    114 	if (gflag) {
    115 		id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
    116 		if (nflag && (gr = getgrgid(id)))
    117 			(void)printf("%s\n", gr->gr_name);
    118 		else
    119 			(void)printf("%u\n", id);
    120 		exit(0);
    121 	}
    122 
    123 	if (uflag) {
    124 		id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
    125 		if (nflag && (pw = getpwuid(id)))
    126 			(void)printf("%s\n", pw->pw_name);
    127 		else
    128 			(void)printf("%u\n", id);
    129 		exit(0);
    130 	}
    131 
    132 	if (Gflag) {
    133 		group(pw, nflag);
    134 		exit(0);
    135 	}
    136 
    137 	if (pflag) {
    138 		pretty(pw);
    139 		exit(0);
    140 	}
    141 
    142 	if (pw)
    143 		user(pw);
    144 	else
    145 		current();
    146 	exit(0);
    147 }
    148 
    149 void
    150 pretty(pw)
    151 	struct passwd *pw;
    152 {
    153 	struct group *gr;
    154 	u_int eid, rid;
    155 	char *login;
    156 
    157 	if (pw) {
    158 		(void)printf("uid\t%s\n", pw->pw_name);
    159 		(void)printf("groups\t");
    160 		group(pw, 1);
    161 	} else {
    162 		if ((login = getlogin()) == NULL)
    163 			err("getlogin: %s", strerror(errno));
    164 
    165 		pw = getpwuid(rid = getuid());
    166 		if (pw == NULL || strcmp(login, pw->pw_name))
    167 			(void)printf("login\t%s\n", login);
    168 		if (pw)
    169 			(void)printf("uid\t%s\n", pw->pw_name);
    170 		else
    171 			(void)printf("uid\t%u\n", rid);
    172 
    173 		if ((eid = geteuid()) != rid)
    174 			if (pw = getpwuid(eid))
    175 				(void)printf("euid\t%s", pw->pw_name);
    176 			else
    177 				(void)printf("euid\t%u", eid);
    178 		if ((rid = getgid()) != (eid = getegid()))
    179 			if (gr = getgrgid(rid))
    180 				(void)printf("rgid\t%s\n", gr->gr_name);
    181 			else
    182 				(void)printf("rgid\t%u\n", rid);
    183 		(void)printf("groups\t");
    184 		group(NULL, 1);
    185 	}
    186 }
    187 
    188 void
    189 current()
    190 {
    191 	struct group *gr;
    192 	struct passwd *pw;
    193 	int cnt, id, eid, lastid, ngroups;
    194 	gid_t groups[NGROUPS];
    195 	char *fmt;
    196 
    197 	id = getuid();
    198 	(void)printf("uid=%u", id);
    199 	if (pw = getpwuid(id))
    200 		(void)printf("(%s)", pw->pw_name);
    201 	if ((eid = geteuid()) != id) {
    202 		(void)printf(" euid=%u", eid);
    203 		if (pw = getpwuid(eid))
    204 			(void)printf("(%s)", pw->pw_name);
    205 	}
    206 	id = getgid();
    207 	(void)printf(" gid=%u", id);
    208 	if (gr = getgrgid(id))
    209 		(void)printf("(%s)", gr->gr_name);
    210 	if ((eid = getegid()) != id) {
    211 		(void)printf(" egid=%u", eid);
    212 		if (gr = getgrgid(eid))
    213 			(void)printf("(%s)", gr->gr_name);
    214 	}
    215 	if (ngroups = getgroups(NGROUPS, groups)) {
    216 		for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups;
    217 		    fmt = ", %u", lastid = id) {
    218 			id = groups[cnt++];
    219 			if (lastid == id)
    220 				continue;
    221 			(void)printf(fmt, id);
    222 			if (gr = getgrgid(id))
    223 				(void)printf("(%s)", gr->gr_name);
    224 		}
    225 	}
    226 	(void)printf("\n");
    227 }
    228 
    229 void
    230 user(pw)
    231 	register struct passwd *pw;
    232 {
    233 	register struct group *gr;
    234 	register char *fmt, **p;
    235 	int cnt, id, lastid, ngroups, groups[NGROUPS + 1];
    236 
    237 	id = pw->pw_uid;
    238 	(void)printf("uid=%u(%s)", id, pw->pw_name);
    239 	(void)printf(" gid=%u", pw->pw_gid);
    240 	if (gr = getgrgid(pw->pw_gid))
    241 		(void)printf("(%s)", gr->gr_name);
    242 	ngroups = NGROUPS + 1;
    243 	(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
    244 	fmt = " groups=%u";
    245 	for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
    246 		if (lastid == (id = groups[cnt]))
    247 			continue;
    248 		(void)printf(fmt, id);
    249 		fmt = " %u";
    250 		if (gr = getgrgid(id))
    251 			(void)printf("(%s)", gr->gr_name);
    252 		lastid = id;
    253 	}
    254 	(void)printf("\n");
    255 }
    256 
    257 void
    258 group(pw, nflag)
    259 	struct passwd *pw;
    260 	int nflag;
    261 {
    262 	struct group *gr;
    263 	int cnt, id, lastid, ngroups;
    264 	gid_t groups[NGROUPS + 1];
    265 	char *fmt;
    266 
    267 	if (pw) {
    268 		ngroups = NGROUPS + 1;
    269 		(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
    270 	} else {
    271 		groups[0] = getgid();
    272 		ngroups = getgroups(NGROUPS, groups + 1) + 1;
    273 	}
    274 	fmt = nflag ? "%s" : "%u";
    275 	for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
    276 		if (lastid == (id = groups[cnt]))
    277 			continue;
    278 		if (nflag) {
    279 			if (gr = getgrgid(id))
    280 				(void)printf(fmt, gr->gr_name);
    281 			else
    282 				(void)printf(*fmt == ' ' ? " %u" : "%u",
    283 				    id);
    284 			fmt = " %s";
    285 		} else {
    286 			(void)printf(fmt, id);
    287 			fmt = " %u";
    288 		}
    289 		lastid = id;
    290 	}
    291 	(void)printf("\n");
    292 }
    293 
    294 struct passwd *
    295 who(u)
    296 	char *u;
    297 {
    298 	struct passwd *pw;
    299 	long id;
    300 	char *ep;
    301 
    302 	/*
    303 	 * Translate user argument into a pw pointer.  First, try to
    304 	 * get it as specified.  If that fails, try it as a number.
    305 	 */
    306 	if (pw = getpwnam(u))
    307 		return(pw);
    308 	id = strtol(u, &ep, 10);
    309 	if (*u && !*ep && (pw = getpwuid(id)))
    310 		return(pw);
    311 	err("%s: No such user", u);
    312 	/* NOTREACHED */
    313 }
    314 
    315 #if __STDC__
    316 #include <stdarg.h>
    317 #else
    318 #include <varargs.h>
    319 #endif
    320 
    321 void
    322 #if __STDC__
    323 err(const char *fmt, ...)
    324 #else
    325 err(fmt, va_alist)
    326 	char *fmt;
    327         va_dcl
    328 #endif
    329 {
    330 	va_list ap;
    331 #if __STDC__
    332 	va_start(ap, fmt);
    333 #else
    334 	va_start(ap);
    335 #endif
    336 	(void)fprintf(stderr, "id: ");
    337 	(void)vfprintf(stderr, fmt, ap);
    338 	va_end(ap);
    339 	(void)fprintf(stderr, "\n");
    340 	exit(1);
    341 	/* NOTREACHED */
    342 }
    343 
    344 void
    345 usage()
    346 {
    347 	(void)fprintf(stderr, "usage: id [user]\n");
    348 	(void)fprintf(stderr, "       id -G [-n] [user]\n");
    349 	(void)fprintf(stderr, "       id -g [-nr] [user]\n");
    350 	(void)fprintf(stderr, "       id -u [-nr] [user]\n");
    351 	exit(1);
    352 }
    353