Annotation of src/usr.bin/id/id.c, Revision 1.13
1.13 ! deraadt 1: /* $OpenBSD: id.c,v 1.12 2003/06/03 02:56:09 millert 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.
1.12 millert 15: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
32: #ifndef lint
33: static char copyright[] =
34: "@(#) Copyright (c) 1991, 1993\n\
35: The Regents of the University of California. All rights reserved.\n";
36: #endif /* not lint */
37:
38: #ifndef lint
39: /*static char sccsid[] = "@(#)id.c 8.3 (Berkeley) 4/28/95";*/
1.13 ! deraadt 40: static char rcsid[] = "$OpenBSD: id.c,v 1.12 2003/06/03 02:56:09 millert Exp $";
1.1 deraadt 41: #endif /* not lint */
42:
43: #include <sys/param.h>
44:
45: #include <errno.h>
46: #include <grp.h>
47: #include <pwd.h>
48: #include <stdio.h>
49: #include <stdlib.h>
50: #include <string.h>
51: #include <unistd.h>
1.6 mickey 52: #include <err.h>
1.1 deraadt 53:
1.11 millert 54: void current(void);
55: void pretty(struct passwd *);
56: void group(struct passwd *, int);
57: void usage(void);
58: void user(struct passwd *);
1.1 deraadt 59: struct passwd *
1.11 millert 60: who(char *);
1.1 deraadt 61:
62: int
1.13 ! deraadt 63: main(int argc, char *argv[])
1.1 deraadt 64: {
65: struct group *gr;
66: struct passwd *pw;
67: int Gflag, ch, gflag, id, nflag, pflag, rflag, uflag;
68:
69: Gflag = gflag = nflag = pflag = rflag = uflag = 0;
1.3 millert 70: while ((ch = getopt(argc, argv, "Ggnpru")) != -1)
1.1 deraadt 71: switch(ch) {
72: case 'G':
73: Gflag = 1;
74: break;
75: case 'g':
76: gflag = 1;
77: break;
78: case 'n':
79: nflag = 1;
80: break;
81: case 'p':
82: pflag = 1;
83: break;
84: case 'r':
85: rflag = 1;
86: break;
87: case 'u':
88: uflag = 1;
89: break;
90: case '?':
91: default:
92: usage();
93: }
94: argc -= optind;
95: argv += optind;
96:
97: switch(Gflag + gflag + pflag + uflag) {
98: case 1:
99: break;
100: case 0:
101: if (!nflag && !rflag)
102: break;
103: /* FALLTHROUGH */
104: default:
105: usage();
106: }
107:
108: pw = *argv ? who(*argv) : NULL;
109:
110: if (gflag) {
111: id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
112: if (nflag && (gr = getgrgid(id)))
113: (void)printf("%s\n", gr->gr_name);
114: else
115: (void)printf("%u\n", id);
116: exit(0);
117: }
118:
119: if (uflag) {
120: id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
121: if (nflag && (pw = getpwuid(id)))
122: (void)printf("%s\n", pw->pw_name);
123: else
124: (void)printf("%u\n", id);
125: exit(0);
126: }
127:
128: if (Gflag) {
129: group(pw, nflag);
130: exit(0);
131: }
132:
133: if (pflag) {
134: pretty(pw);
135: exit(0);
136: }
137:
138: if (pw)
139: user(pw);
140: else
141: current();
142: exit(0);
143: }
144:
145: void
1.13 ! deraadt 146: pretty(struct passwd *pw)
1.1 deraadt 147: {
148: struct group *gr;
1.4 deraadt 149: uid_t eid, rid;
1.1 deraadt 150: char *login;
151:
152: if (pw) {
153: (void)printf("uid\t%s\n", pw->pw_name);
154: (void)printf("groups\t");
155: group(pw, 1);
156: } else {
157: if ((login = getlogin()) == NULL)
1.6 mickey 158: err(1, "getlogin");
1.1 deraadt 159:
160: pw = getpwuid(rid = getuid());
161: if (pw == NULL || strcmp(login, pw->pw_name))
162: (void)printf("login\t%s\n", login);
163: if (pw)
164: (void)printf("uid\t%s\n", pw->pw_name);
165: else
166: (void)printf("uid\t%u\n", rid);
167:
1.9 deraadt 168: if ((eid = geteuid()) != rid) {
1.4 deraadt 169: if ((pw = getpwuid(eid)))
1.7 aaron 170: (void)printf("euid\t%s\n", pw->pw_name);
1.1 deraadt 171: else
1.7 aaron 172: (void)printf("euid\t%u\n", eid);
1.9 deraadt 173: }
174: if ((rid = getgid()) != (eid = getegid())) {
1.4 deraadt 175: if ((gr = getgrgid(rid)))
1.1 deraadt 176: (void)printf("rgid\t%s\n", gr->gr_name);
177: else
178: (void)printf("rgid\t%u\n", rid);
1.9 deraadt 179: }
1.1 deraadt 180: (void)printf("groups\t");
181: group(NULL, 1);
182: }
183: }
184:
185: void
1.13 ! deraadt 186: current(void)
1.1 deraadt 187: {
188: struct group *gr;
189: struct passwd *pw;
1.4 deraadt 190: int cnt, ngroups;
191: uid_t id, eid;
192: gid_t groups[NGROUPS], gid, lastgid;
1.1 deraadt 193: char *fmt;
194:
195: id = getuid();
196: (void)printf("uid=%u", id);
1.4 deraadt 197: if ((pw = getpwuid(id)))
1.1 deraadt 198: (void)printf("(%s)", pw->pw_name);
199: if ((eid = geteuid()) != id) {
200: (void)printf(" euid=%u", eid);
1.4 deraadt 201: if ((pw = getpwuid(eid)))
1.1 deraadt 202: (void)printf("(%s)", pw->pw_name);
203: }
204: id = getgid();
205: (void)printf(" gid=%u", id);
1.4 deraadt 206: if ((gr = getgrgid(id)))
1.1 deraadt 207: (void)printf("(%s)", gr->gr_name);
208: if ((eid = getegid()) != id) {
209: (void)printf(" egid=%u", eid);
1.4 deraadt 210: if ((gr = getgrgid(eid)))
1.1 deraadt 211: (void)printf("(%s)", gr->gr_name);
212: }
1.4 deraadt 213: if ((ngroups = getgroups(NGROUPS, groups))) {
214: for (fmt = " groups=%u", lastgid = (gid_t)-1, cnt = 0; cnt < ngroups;
215: fmt = ", %u", lastgid = gid) {
216: gid = groups[cnt++];
217: if (lastgid == gid)
1.1 deraadt 218: continue;
1.4 deraadt 219: (void)printf(fmt, gid);
220: if ((gr = getgrgid(gid)))
1.1 deraadt 221: (void)printf("(%s)", gr->gr_name);
222: }
223: }
224: (void)printf("\n");
225: }
226:
227: void
1.13 ! deraadt 228: user(struct passwd *pw)
1.1 deraadt 229: {
1.10 mpech 230: struct group *gr;
231: char *fmt;
1.1 deraadt 232: int cnt, id, lastid, ngroups, groups[NGROUPS + 1];
233:
234: id = pw->pw_uid;
235: (void)printf("uid=%u(%s)", id, pw->pw_name);
236: (void)printf(" gid=%u", pw->pw_gid);
1.4 deraadt 237: if ((gr = getgrgid(pw->pw_gid)))
1.1 deraadt 238: (void)printf("(%s)", gr->gr_name);
239: ngroups = NGROUPS + 1;
240: (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
241: fmt = " groups=%u";
242: for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
243: if (lastid == (id = groups[cnt]))
244: continue;
245: (void)printf(fmt, id);
1.8 aaron 246: fmt = ", %u";
1.4 deraadt 247: if ((gr = getgrgid(id)))
1.1 deraadt 248: (void)printf("(%s)", gr->gr_name);
249: lastid = id;
250: }
251: (void)printf("\n");
252: }
253:
254: void
1.13 ! deraadt 255: group(struct passwd *pw, int nflag)
1.1 deraadt 256: {
257: struct group *gr;
258: int cnt, id, lastid, ngroups;
259: gid_t groups[NGROUPS + 1];
260: char *fmt;
261:
262: if (pw) {
263: ngroups = NGROUPS + 1;
264: (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
265: } else {
266: groups[0] = getgid();
267: ngroups = getgroups(NGROUPS, groups + 1) + 1;
268: }
269: fmt = nflag ? "%s" : "%u";
270: for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
271: if (lastid == (id = groups[cnt]))
272: continue;
273: if (nflag) {
1.4 deraadt 274: if ((gr = getgrgid(id)))
1.1 deraadt 275: (void)printf(fmt, gr->gr_name);
276: else
277: (void)printf(*fmt == ' ' ? " %u" : "%u",
278: id);
279: fmt = " %s";
280: } else {
281: (void)printf(fmt, id);
282: fmt = " %u";
283: }
284: lastid = id;
285: }
286: (void)printf("\n");
287: }
288:
289: struct passwd *
1.13 ! deraadt 290: who(char *u)
1.1 deraadt 291: {
292: struct passwd *pw;
1.4 deraadt 293: uid_t id;
1.1 deraadt 294: char *ep;
295:
296: /*
297: * Translate user argument into a pw pointer. First, try to
298: * get it as specified. If that fails, try it as a number.
299: */
1.4 deraadt 300: if ((pw = getpwnam(u)))
1.1 deraadt 301: return(pw);
1.4 deraadt 302: id = strtoul(u, &ep, 10);
1.1 deraadt 303: if (*u && !*ep && (pw = getpwuid(id)))
304: return(pw);
1.6 mickey 305: errx(1, "%s: No such user", u);
1.1 deraadt 306: /* NOTREACHED */
307: }
308:
309: void
1.13 ! deraadt 310: usage(void)
1.1 deraadt 311: {
1.6 mickey 312: (void)fprintf(stderr, "usage: id [user]\n"
313: " id -G [-n] [user]\n"
314: " id -g [-nr] [user]\n"
1.7 aaron 315: " id -p\n"
1.6 mickey 316: " id -u [-nr] [user]\n");
1.1 deraadt 317: exit(1);
318: }
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