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1.3 ! millert 1: /* $OpenBSD: id.c,v 1.2 1996/06/26 05:34:24 deraadt Exp $ */
1.2 deraadt 2:
1.1 deraadt 3: /*-
4: * Copyright (c) 1991, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: static char copyright[] =
38: "@(#) Copyright (c) 1991, 1993\n\
39: The Regents of the University of California. All rights reserved.\n";
40: #endif /* not lint */
41:
42: #ifndef lint
43: /*static char sccsid[] = "@(#)id.c 8.3 (Berkeley) 4/28/95";*/
1.3 ! millert 44: static char rcsid[] = "$OpenBSD: id.c,v 1.2 1996/06/26 05:34:24 deraadt Exp $";
1.1 deraadt 45: #endif /* not lint */
46:
47: #include <sys/param.h>
48:
49: #include <errno.h>
50: #include <grp.h>
51: #include <pwd.h>
52: #include <stdio.h>
53: #include <stdlib.h>
54: #include <string.h>
55: #include <unistd.h>
56:
57: void current __P((void));
58: void err __P((const char *, ...));
59: void pretty __P((struct passwd *));
60: void group __P((struct passwd *, int));
61: void usage __P((void));
62: void user __P((struct passwd *));
63: struct passwd *
64: who __P((char *));
65:
66: int
67: main(argc, argv)
68: int argc;
69: char *argv[];
70: {
71: struct group *gr;
72: struct passwd *pw;
73: int Gflag, ch, gflag, id, nflag, pflag, rflag, uflag;
74:
75: Gflag = gflag = nflag = pflag = rflag = uflag = 0;
1.3 ! millert 76: while ((ch = getopt(argc, argv, "Ggnpru")) != -1)
1.1 deraadt 77: switch(ch) {
78: case 'G':
79: Gflag = 1;
80: break;
81: case 'g':
82: gflag = 1;
83: break;
84: case 'n':
85: nflag = 1;
86: break;
87: case 'p':
88: pflag = 1;
89: break;
90: case 'r':
91: rflag = 1;
92: break;
93: case 'u':
94: uflag = 1;
95: break;
96: case '?':
97: default:
98: usage();
99: }
100: argc -= optind;
101: argv += optind;
102:
103: switch(Gflag + gflag + pflag + uflag) {
104: case 1:
105: break;
106: case 0:
107: if (!nflag && !rflag)
108: break;
109: /* FALLTHROUGH */
110: default:
111: usage();
112: }
113:
114: pw = *argv ? who(*argv) : NULL;
115:
116: if (gflag) {
117: id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
118: if (nflag && (gr = getgrgid(id)))
119: (void)printf("%s\n", gr->gr_name);
120: else
121: (void)printf("%u\n", id);
122: exit(0);
123: }
124:
125: if (uflag) {
126: id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
127: if (nflag && (pw = getpwuid(id)))
128: (void)printf("%s\n", pw->pw_name);
129: else
130: (void)printf("%u\n", id);
131: exit(0);
132: }
133:
134: if (Gflag) {
135: group(pw, nflag);
136: exit(0);
137: }
138:
139: if (pflag) {
140: pretty(pw);
141: exit(0);
142: }
143:
144: if (pw)
145: user(pw);
146: else
147: current();
148: exit(0);
149: }
150:
151: void
152: pretty(pw)
153: struct passwd *pw;
154: {
155: struct group *gr;
156: u_int eid, rid;
157: char *login;
158:
159: if (pw) {
160: (void)printf("uid\t%s\n", pw->pw_name);
161: (void)printf("groups\t");
162: group(pw, 1);
163: } else {
164: if ((login = getlogin()) == NULL)
165: err("getlogin: %s", strerror(errno));
166:
167: pw = getpwuid(rid = getuid());
168: if (pw == NULL || strcmp(login, pw->pw_name))
169: (void)printf("login\t%s\n", login);
170: if (pw)
171: (void)printf("uid\t%s\n", pw->pw_name);
172: else
173: (void)printf("uid\t%u\n", rid);
174:
175: if ((eid = geteuid()) != rid)
176: if (pw = getpwuid(eid))
177: (void)printf("euid\t%s", pw->pw_name);
178: else
179: (void)printf("euid\t%u", eid);
180: if ((rid = getgid()) != (eid = getegid()))
181: if (gr = getgrgid(rid))
182: (void)printf("rgid\t%s\n", gr->gr_name);
183: else
184: (void)printf("rgid\t%u\n", rid);
185: (void)printf("groups\t");
186: group(NULL, 1);
187: }
188: }
189:
190: void
191: current()
192: {
193: struct group *gr;
194: struct passwd *pw;
195: int cnt, id, eid, lastid, ngroups;
196: gid_t groups[NGROUPS];
197: char *fmt;
198:
199: id = getuid();
200: (void)printf("uid=%u", id);
201: if (pw = getpwuid(id))
202: (void)printf("(%s)", pw->pw_name);
203: if ((eid = geteuid()) != id) {
204: (void)printf(" euid=%u", eid);
205: if (pw = getpwuid(eid))
206: (void)printf("(%s)", pw->pw_name);
207: }
208: id = getgid();
209: (void)printf(" gid=%u", id);
210: if (gr = getgrgid(id))
211: (void)printf("(%s)", gr->gr_name);
212: if ((eid = getegid()) != id) {
213: (void)printf(" egid=%u", eid);
214: if (gr = getgrgid(eid))
215: (void)printf("(%s)", gr->gr_name);
216: }
217: if (ngroups = getgroups(NGROUPS, groups)) {
218: for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups;
219: fmt = ", %u", lastid = id) {
220: id = groups[cnt++];
221: if (lastid == id)
222: continue;
223: (void)printf(fmt, id);
224: if (gr = getgrgid(id))
225: (void)printf("(%s)", gr->gr_name);
226: }
227: }
228: (void)printf("\n");
229: }
230:
231: void
232: user(pw)
233: register struct passwd *pw;
234: {
235: register struct group *gr;
236: register char *fmt, **p;
237: int cnt, id, lastid, ngroups, groups[NGROUPS + 1];
238:
239: id = pw->pw_uid;
240: (void)printf("uid=%u(%s)", id, pw->pw_name);
241: (void)printf(" gid=%u", pw->pw_gid);
242: if (gr = getgrgid(pw->pw_gid))
243: (void)printf("(%s)", gr->gr_name);
244: ngroups = NGROUPS + 1;
245: (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
246: fmt = " groups=%u";
247: for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
248: if (lastid == (id = groups[cnt]))
249: continue;
250: (void)printf(fmt, id);
251: fmt = " %u";
252: if (gr = getgrgid(id))
253: (void)printf("(%s)", gr->gr_name);
254: lastid = id;
255: }
256: (void)printf("\n");
257: }
258:
259: void
260: group(pw, nflag)
261: struct passwd *pw;
262: int nflag;
263: {
264: struct group *gr;
265: int cnt, id, lastid, ngroups;
266: gid_t groups[NGROUPS + 1];
267: char *fmt;
268:
269: if (pw) {
270: ngroups = NGROUPS + 1;
271: (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
272: } else {
273: groups[0] = getgid();
274: ngroups = getgroups(NGROUPS, groups + 1) + 1;
275: }
276: fmt = nflag ? "%s" : "%u";
277: for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
278: if (lastid == (id = groups[cnt]))
279: continue;
280: if (nflag) {
281: if (gr = getgrgid(id))
282: (void)printf(fmt, gr->gr_name);
283: else
284: (void)printf(*fmt == ' ' ? " %u" : "%u",
285: id);
286: fmt = " %s";
287: } else {
288: (void)printf(fmt, id);
289: fmt = " %u";
290: }
291: lastid = id;
292: }
293: (void)printf("\n");
294: }
295:
296: struct passwd *
297: who(u)
298: char *u;
299: {
300: struct passwd *pw;
301: long id;
302: char *ep;
303:
304: /*
305: * Translate user argument into a pw pointer. First, try to
306: * get it as specified. If that fails, try it as a number.
307: */
308: if (pw = getpwnam(u))
309: return(pw);
310: id = strtol(u, &ep, 10);
311: if (*u && !*ep && (pw = getpwuid(id)))
312: return(pw);
313: err("%s: No such user", u);
314: /* NOTREACHED */
315: }
316:
317: #if __STDC__
318: #include <stdarg.h>
319: #else
320: #include <varargs.h>
321: #endif
322:
323: void
324: #if __STDC__
325: err(const char *fmt, ...)
326: #else
327: err(fmt, va_alist)
328: char *fmt;
329: va_dcl
330: #endif
331: {
332: va_list ap;
333: #if __STDC__
334: va_start(ap, fmt);
335: #else
336: va_start(ap);
337: #endif
338: (void)fprintf(stderr, "id: ");
339: (void)vfprintf(stderr, fmt, ap);
340: va_end(ap);
341: (void)fprintf(stderr, "\n");
342: exit(1);
343: /* NOTREACHED */
344: }
345:
346: void
347: usage()
348: {
349: (void)fprintf(stderr, "usage: id [user]\n");
350: (void)fprintf(stderr, " id -G [-n] [user]\n");
351: (void)fprintf(stderr, " id -g [-nr] [user]\n");
352: (void)fprintf(stderr, " id -u [-nr] [user]\n");
353: exit(1);
354: }