File: | src/usr.bin/id/id.c |
Warning: | line 212, column 28 Although the value stored to 'eid' is used in the enclosing expression, the value is never actually read from 'eid' |
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1 | /* $OpenBSD: id.c,v 1.28 2017/05/30 15:29:53 tedu Exp $ */ |
2 | |
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. Neither the name of the University nor the names of its contributors |
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 | #include <sys/types.h> |
33 | #include <sys/socket.h> /* getrtable() lives here */ |
34 | |
35 | #include <err.h> |
36 | #include <errno(*__errno()).h> |
37 | #include <grp.h> |
38 | #include <pwd.h> |
39 | #include <stdio.h> |
40 | #include <stdlib.h> |
41 | #include <string.h> |
42 | #include <unistd.h> |
43 | #include <limits.h> |
44 | #include <login_cap.h> |
45 | |
46 | void current(void); |
47 | void pretty(struct passwd *); |
48 | void group(struct passwd *, int); |
49 | void usage(void); |
50 | void user(struct passwd *); |
51 | struct passwd * |
52 | who(char *); |
53 | |
54 | int |
55 | main(int argc, char *argv[]) |
56 | { |
57 | struct group *gr; |
58 | struct passwd *pw; |
59 | int ch, cflag, Gflag, gflag, nflag, pflag, Rflag, rflag, uflag; |
60 | uid_t uid; |
61 | gid_t gid; |
62 | const char *opts; |
63 | |
64 | if (pledge("stdio getpw", NULL((void *)0)) == -1) |
65 | err(1, "pledge"); |
66 | |
67 | cflag = Gflag = gflag = nflag = pflag = Rflag = rflag = uflag = 0; |
68 | |
69 | if (strcmp(getprogname(), "groups") == 0) { |
70 | Gflag = 1; |
71 | nflag = 1; |
72 | opts = ""; |
73 | if (argc > 2) |
74 | usage(); |
75 | } else if (strcmp(getprogname(), "whoami") == 0) { |
76 | uflag = 1; |
77 | nflag = 1; |
78 | opts = ""; |
79 | if (argc > 1) |
80 | usage(); |
81 | } else |
82 | opts = "cGgnpRru"; |
83 | |
84 | while ((ch = getopt(argc, argv, opts)) != -1) |
85 | switch(ch) { |
86 | case 'c': |
87 | cflag = 1; |
88 | break; |
89 | case 'G': |
90 | Gflag = 1; |
91 | break; |
92 | case 'g': |
93 | gflag = 1; |
94 | break; |
95 | case 'n': |
96 | nflag = 1; |
97 | break; |
98 | case 'p': |
99 | pflag = 1; |
100 | break; |
101 | case 'R': |
102 | Rflag = 1; |
103 | break; |
104 | case 'r': |
105 | rflag = 1; |
106 | break; |
107 | case 'u': |
108 | uflag = 1; |
109 | break; |
110 | case '?': |
111 | default: |
112 | usage(); |
113 | } |
114 | argc -= optind; |
115 | argv += optind; |
116 | |
117 | switch (cflag + Gflag + gflag + pflag + Rflag + uflag) { |
118 | case 1: |
119 | break; |
120 | case 0: |
121 | if (!nflag && !rflag) |
122 | break; |
123 | /* FALLTHROUGH */ |
124 | default: |
125 | usage(); |
126 | } |
127 | |
128 | if (strcmp(opts, "") != 0 && argc > 1) |
129 | usage(); |
130 | |
131 | if (Rflag) { |
132 | printf("%d\n", getrtable()); |
133 | exit(0); |
134 | } |
135 | |
136 | pw = *argv ? who(*argv) : NULL((void *)0); |
137 | |
138 | if (cflag) { |
139 | if (pw == NULL((void *)0)) |
140 | pw = getpwuid(getuid()); |
141 | if (pw != NULL((void *)0) && pw->pw_class != NULL((void *)0) && *pw->pw_class != '\0') |
142 | (void)printf("%s\n", pw->pw_class); |
143 | else |
144 | (void)printf("%s\n", LOGIN_DEFCLASS"default"); |
145 | exit(0); |
146 | } |
147 | |
148 | if (gflag) { |
149 | gid = pw ? pw->pw_gid : rflag ? getgid() : getegid(); |
150 | if (nflag && (gr = getgrgid(gid))) |
151 | (void)printf("%s\n", gr->gr_name); |
152 | else |
153 | (void)printf("%u\n", gid); |
154 | exit(0); |
155 | } |
156 | |
157 | if (uflag) { |
158 | uid = pw ? pw->pw_uid : rflag ? getuid() : geteuid(); |
159 | if (nflag && (pw = getpwuid(uid))) |
160 | (void)printf("%s\n", pw->pw_name); |
161 | else |
162 | (void)printf("%u\n", uid); |
163 | exit(0); |
164 | } |
165 | |
166 | if (Gflag) { |
167 | group(pw, nflag); |
168 | exit(0); |
169 | } |
170 | |
171 | if (pflag) { |
172 | pretty(pw); |
173 | exit(0); |
174 | } |
175 | |
176 | if (pw) |
177 | user(pw); |
178 | else |
179 | current(); |
180 | exit(0); |
181 | } |
182 | |
183 | void |
184 | pretty(struct passwd *pw) |
185 | { |
186 | struct group *gr; |
187 | uid_t eid, rid; |
188 | char *login; |
189 | |
190 | if (pw) { |
191 | (void)printf("uid\t%s\n", pw->pw_name); |
192 | (void)printf("groups\t"); |
193 | group(pw, 1); |
194 | } else { |
195 | if ((login = getlogin()) == NULL((void *)0)) |
196 | err(1, "getlogin"); |
197 | |
198 | pw = getpwuid(rid = getuid()); |
199 | if (pw == NULL((void *)0) || strcmp(login, pw->pw_name)) |
200 | (void)printf("login\t%s\n", login); |
201 | if (pw) |
202 | (void)printf("uid\t%s\n", pw->pw_name); |
203 | else |
204 | (void)printf("uid\t%u\n", rid); |
205 | |
206 | if ((eid = geteuid()) != rid) { |
207 | if ((pw = getpwuid(eid))) |
208 | (void)printf("euid\t%s\n", pw->pw_name); |
209 | else |
210 | (void)printf("euid\t%u\n", eid); |
211 | } |
212 | if ((rid = getgid()) != (eid = getegid())) { |
Although the value stored to 'eid' is used in the enclosing expression, the value is never actually read from 'eid' | |
213 | if ((gr = getgrgid(rid))) |
214 | (void)printf("rgid\t%s\n", gr->gr_name); |
215 | else |
216 | (void)printf("rgid\t%u\n", rid); |
217 | } |
218 | (void)printf("groups\t"); |
219 | group(NULL((void *)0), 1); |
220 | } |
221 | if (pw != NULL((void *)0) && pw->pw_class != NULL((void *)0) && *pw->pw_class != '\0') |
222 | (void)printf("class\t%s\n", pw->pw_class); |
223 | } |
224 | |
225 | void |
226 | current(void) |
227 | { |
228 | struct group *gr; |
229 | struct passwd *pw; |
230 | int cnt, ngroups; |
231 | uid_t uid, euid; |
232 | gid_t groups[NGROUPS_MAX16], gid, egid, lastgid; |
233 | char *prefix; |
234 | |
235 | uid = getuid(); |
236 | (void)printf("uid=%u", uid); |
237 | if ((pw = getpwuid(uid))) |
238 | (void)printf("(%s)", pw->pw_name); |
239 | if ((euid = geteuid()) != uid) { |
240 | (void)printf(" euid=%u", euid); |
241 | if ((pw = getpwuid(euid))) |
242 | (void)printf("(%s)", pw->pw_name); |
243 | } |
244 | gid = getgid(); |
245 | (void)printf(" gid=%u", gid); |
246 | if ((gr = getgrgid(gid))) |
247 | (void)printf("(%s)", gr->gr_name); |
248 | if ((egid = getegid()) != gid) { |
249 | (void)printf(" egid=%u", egid); |
250 | if ((gr = getgrgid(egid))) |
251 | (void)printf("(%s)", gr->gr_name); |
252 | } |
253 | if ((ngroups = getgroups(NGROUPS_MAX16, groups))) { |
254 | for (prefix = " groups=", lastgid = (gid_t)-1, cnt = 0; |
255 | cnt < ngroups; prefix = ", ", lastgid = gid) { |
256 | gid = groups[cnt++]; |
257 | if (lastgid == gid) |
258 | continue; |
259 | (void)printf("%s%u", prefix, gid); |
260 | if ((gr = getgrgid(gid))) |
261 | (void)printf("(%s)", gr->gr_name); |
262 | } |
263 | } |
264 | (void)printf("\n"); |
265 | } |
266 | |
267 | void |
268 | user(struct passwd *pw) |
269 | { |
270 | gid_t gid, groups[NGROUPS_MAX16 + 1]; |
271 | int cnt, ngroups; |
272 | uid_t uid; |
273 | struct group *gr; |
274 | char *prefix; |
275 | |
276 | uid = pw->pw_uid; |
277 | (void)printf("uid=%u(%s)", uid, pw->pw_name); |
278 | (void)printf(" gid=%u", pw->pw_gid); |
279 | if ((gr = getgrgid(pw->pw_gid))) |
280 | (void)printf("(%s)", gr->gr_name); |
281 | ngroups = NGROUPS_MAX16 + 1; |
282 | (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); |
283 | prefix = " groups="; |
284 | for (cnt = 0; cnt < ngroups;) { |
285 | gid = groups[cnt]; |
286 | (void)printf("%s%u", prefix, gid); |
287 | prefix = ", "; |
288 | if ((gr = getgrgid(gid))) |
289 | (void)printf("(%s)", gr->gr_name); |
290 | /* Skip same gid entries. */ |
291 | while (++cnt < ngroups && gid == groups[cnt]) |
292 | ; |
293 | } |
294 | (void)printf("\n"); |
295 | } |
296 | |
297 | void |
298 | group(struct passwd *pw, int nflag) |
299 | { |
300 | int cnt, ngroups; |
301 | gid_t gid, groups[NGROUPS_MAX16 + 1]; |
302 | struct group *gr; |
303 | char *prefix; |
304 | |
305 | if (pw) { |
306 | ngroups = NGROUPS_MAX16 + 1; |
307 | (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); |
308 | } else { |
309 | groups[0] = getgid(); |
310 | ngroups = getgroups(NGROUPS_MAX16, groups + 1) + 1; |
311 | } |
312 | prefix = ""; |
313 | for (cnt = 0; cnt < ngroups;) { |
314 | gid = groups[cnt]; |
315 | if (nflag) { |
316 | if ((gr = getgrgid(gid))) |
317 | (void)printf("%s%s", prefix, gr->gr_name); |
318 | else |
319 | (void)printf("%s%u", prefix, gid); |
320 | } else { |
321 | (void)printf("%s%u", prefix, gid); |
322 | } |
323 | prefix = " "; |
324 | /* Skip same gid entries. */ |
325 | while (++cnt < ngroups && gid == groups[cnt]) |
326 | ; |
327 | } |
328 | (void)printf("\n"); |
329 | } |
330 | |
331 | struct passwd * |
332 | who(char *u) |
333 | { |
334 | struct passwd *pw; |
335 | uid_t uid; |
336 | const char *errstr; |
337 | |
338 | /* |
339 | * Translate user argument into a pw pointer. First, try to |
340 | * get it as specified. If that fails, try it as a number. |
341 | */ |
342 | if ((pw = getpwnam(u))) |
343 | return(pw); |
344 | uid = strtonum(u, 0, UID_MAX(2147483647 *2U +1U), &errstr); |
345 | if (!errstr && (pw = getpwuid(uid))) |
346 | return(pw); |
347 | errx(1, "%s: No such user", u); |
348 | /* NOTREACHED */ |
349 | } |
350 | |
351 | void |
352 | usage(void) |
353 | { |
354 | if (strcmp(getprogname(), "groups") == 0) { |
355 | (void)fprintf(stderr(&__sF[2]), "usage: groups [user]\n"); |
356 | } else if (strcmp(getprogname(), "whoami") == 0) { |
357 | (void)fprintf(stderr(&__sF[2]), "usage: whoami\n"); |
358 | } else { |
359 | (void)fprintf(stderr(&__sF[2]), "usage: id [user]\n"); |
360 | (void)fprintf(stderr(&__sF[2]), " id -c [user]\n"); |
361 | (void)fprintf(stderr(&__sF[2]), " id -G [-n] [user]\n"); |
362 | (void)fprintf(stderr(&__sF[2]), " id -g [-nr] [user]\n"); |
363 | (void)fprintf(stderr(&__sF[2]), " id -p [user]\n"); |
364 | (void)fprintf(stderr(&__sF[2]), " id -R\n"); |
365 | (void)fprintf(stderr(&__sF[2]), " id -u [-nr] [user]\n"); |
366 | } |
367 | exit(1); |
368 | } |