Annotation of src/usr.bin/id/id.c, Revision 1.8
1.8 ! aaron 1: /* $OpenBSD: id.c,v 1.7 1999/07/23 19:24:33 aaron 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";*/
1.8 ! aaron 44: static char rcsid[] = "$OpenBSD: id.c,v 1.7 1999/07/23 19:24:33 aaron 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>
1.6 mickey 56: #include <err.h>
1.1 deraadt 57:
58: void current __P((void));
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;
1.4 deraadt 156: uid_t eid, rid;
1.1 deraadt 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)
1.6 mickey 165: err(1, "getlogin");
1.1 deraadt 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)
1.4 deraadt 176: if ((pw = getpwuid(eid)))
1.7 aaron 177: (void)printf("euid\t%s\n", pw->pw_name);
1.1 deraadt 178: else
1.7 aaron 179: (void)printf("euid\t%u\n", eid);
1.1 deraadt 180: if ((rid = getgid()) != (eid = getegid()))
1.4 deraadt 181: if ((gr = getgrgid(rid)))
1.1 deraadt 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;
1.4 deraadt 195: int cnt, ngroups;
196: uid_t id, eid;
197: gid_t groups[NGROUPS], gid, lastgid;
1.1 deraadt 198: char *fmt;
199:
200: id = getuid();
201: (void)printf("uid=%u", id);
1.4 deraadt 202: if ((pw = getpwuid(id)))
1.1 deraadt 203: (void)printf("(%s)", pw->pw_name);
204: if ((eid = geteuid()) != id) {
205: (void)printf(" euid=%u", eid);
1.4 deraadt 206: if ((pw = getpwuid(eid)))
1.1 deraadt 207: (void)printf("(%s)", pw->pw_name);
208: }
209: id = getgid();
210: (void)printf(" gid=%u", id);
1.4 deraadt 211: if ((gr = getgrgid(id)))
1.1 deraadt 212: (void)printf("(%s)", gr->gr_name);
213: if ((eid = getegid()) != id) {
214: (void)printf(" egid=%u", eid);
1.4 deraadt 215: if ((gr = getgrgid(eid)))
1.1 deraadt 216: (void)printf("(%s)", gr->gr_name);
217: }
1.4 deraadt 218: if ((ngroups = getgroups(NGROUPS, groups))) {
219: for (fmt = " groups=%u", lastgid = (gid_t)-1, cnt = 0; cnt < ngroups;
220: fmt = ", %u", lastgid = gid) {
221: gid = groups[cnt++];
222: if (lastgid == gid)
1.1 deraadt 223: continue;
1.4 deraadt 224: (void)printf(fmt, gid);
225: if ((gr = getgrgid(gid)))
1.1 deraadt 226: (void)printf("(%s)", gr->gr_name);
227: }
228: }
229: (void)printf("\n");
230: }
231:
232: void
233: user(pw)
234: register struct passwd *pw;
235: {
236: register struct group *gr;
1.4 deraadt 237: register char *fmt;
1.1 deraadt 238: int cnt, id, lastid, ngroups, groups[NGROUPS + 1];
239:
240: id = pw->pw_uid;
241: (void)printf("uid=%u(%s)", id, pw->pw_name);
242: (void)printf(" gid=%u", pw->pw_gid);
1.4 deraadt 243: if ((gr = getgrgid(pw->pw_gid)))
1.1 deraadt 244: (void)printf("(%s)", gr->gr_name);
245: ngroups = NGROUPS + 1;
246: (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
247: fmt = " groups=%u";
248: for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
249: if (lastid == (id = groups[cnt]))
250: continue;
251: (void)printf(fmt, id);
1.8 ! aaron 252: fmt = ", %u";
1.4 deraadt 253: if ((gr = getgrgid(id)))
1.1 deraadt 254: (void)printf("(%s)", gr->gr_name);
255: lastid = id;
256: }
257: (void)printf("\n");
258: }
259:
260: void
261: group(pw, nflag)
262: struct passwd *pw;
263: int nflag;
264: {
265: struct group *gr;
266: int cnt, id, lastid, ngroups;
267: gid_t groups[NGROUPS + 1];
268: char *fmt;
269:
270: if (pw) {
271: ngroups = NGROUPS + 1;
272: (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
273: } else {
274: groups[0] = getgid();
275: ngroups = getgroups(NGROUPS, groups + 1) + 1;
276: }
277: fmt = nflag ? "%s" : "%u";
278: for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
279: if (lastid == (id = groups[cnt]))
280: continue;
281: if (nflag) {
1.4 deraadt 282: if ((gr = getgrgid(id)))
1.1 deraadt 283: (void)printf(fmt, gr->gr_name);
284: else
285: (void)printf(*fmt == ' ' ? " %u" : "%u",
286: id);
287: fmt = " %s";
288: } else {
289: (void)printf(fmt, id);
290: fmt = " %u";
291: }
292: lastid = id;
293: }
294: (void)printf("\n");
295: }
296:
297: struct passwd *
298: who(u)
299: char *u;
300: {
301: struct passwd *pw;
1.4 deraadt 302: uid_t id;
1.1 deraadt 303: char *ep;
304:
305: /*
306: * Translate user argument into a pw pointer. First, try to
307: * get it as specified. If that fails, try it as a number.
308: */
1.4 deraadt 309: if ((pw = getpwnam(u)))
1.1 deraadt 310: return(pw);
1.4 deraadt 311: id = strtoul(u, &ep, 10);
1.1 deraadt 312: if (*u && !*ep && (pw = getpwuid(id)))
313: return(pw);
1.6 mickey 314: errx(1, "%s: No such user", u);
1.1 deraadt 315: /* NOTREACHED */
316: }
317:
318: void
319: usage()
320: {
1.6 mickey 321: (void)fprintf(stderr, "usage: id [user]\n"
322: " id -G [-n] [user]\n"
323: " id -g [-nr] [user]\n"
1.7 aaron 324: " id -p\n"
1.6 mickey 325: " id -u [-nr] [user]\n");
1.1 deraadt 326: exit(1);
327: }
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