| File: | src/usr.bin/id/id.c |
| Warning: | line 213, 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 1.30 2023/05/30 16:44:16 op 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 | default: |
| 111 | usage(); |
| 112 | } |
| 113 | argc -= optind; |
| 114 | argv += optind; |
| 115 | |
| 116 | switch (cflag + Gflag + gflag + pflag + Rflag + uflag) { |
| 117 | case 1: |
| 118 | break; |
| 119 | case 0: |
| 120 | if (!nflag && !rflag) |
| 121 | break; |
| 122 | /* FALLTHROUGH */ |
| 123 | default: |
| 124 | usage(); |
| 125 | } |
| 126 | |
| 127 | if (strcmp(opts, "") != 0 && argc > 1) |
| 128 | usage(); |
| 129 | |
| 130 | if (Rflag) { |
| 131 | if (argc != 0) |
| 132 | usage(); |
| 133 | printf("%d\n", getrtable()); |
| 134 | exit(0); |
| 135 | } |
| 136 | |
| 137 | pw = *argv ? who(*argv) : NULL((void *)0); |
| 138 | |
| 139 | if (cflag) { |
| 140 | if (pw == NULL((void *)0)) |
| 141 | pw = getpwuid(getuid()); |
| 142 | if (pw != NULL((void *)0) && pw->pw_class != NULL((void *)0) && *pw->pw_class != '\0') |
| 143 | (void)printf("%s\n", pw->pw_class); |
| 144 | else |
| 145 | (void)printf("%s\n", LOGIN_DEFCLASS"default"); |
| 146 | exit(0); |
| 147 | } |
| 148 | |
| 149 | if (gflag) { |
| 150 | gid = pw ? pw->pw_gid : rflag ? getgid() : getegid(); |
| 151 | if (nflag && (gr = getgrgid(gid))) |
| 152 | (void)printf("%s\n", gr->gr_name); |
| 153 | else |
| 154 | (void)printf("%u\n", gid); |
| 155 | exit(0); |
| 156 | } |
| 157 | |
| 158 | if (uflag) { |
| 159 | uid = pw ? pw->pw_uid : rflag ? getuid() : geteuid(); |
| 160 | if (nflag && (pw = getpwuid(uid))) |
| 161 | (void)printf("%s\n", pw->pw_name); |
| 162 | else |
| 163 | (void)printf("%u\n", uid); |
| 164 | exit(0); |
| 165 | } |
| 166 | |
| 167 | if (Gflag) { |
| 168 | group(pw, nflag); |
| 169 | exit(0); |
| 170 | } |
| 171 | |
| 172 | if (pflag) { |
| 173 | pretty(pw); |
| 174 | exit(0); |
| 175 | } |
| 176 | |
| 177 | if (pw) |
| 178 | user(pw); |
| 179 | else |
| 180 | current(); |
| 181 | exit(0); |
| 182 | } |
| 183 | |
| 184 | void |
| 185 | pretty(struct passwd *pw) |
| 186 | { |
| 187 | struct group *gr; |
| 188 | uid_t eid, rid; |
| 189 | char *login; |
| 190 | |
| 191 | if (pw) { |
| 192 | (void)printf("uid\t%s\n", pw->pw_name); |
| 193 | (void)printf("groups\t"); |
| 194 | group(pw, 1); |
| 195 | } else { |
| 196 | if ((login = getlogin()) == NULL((void *)0)) |
| 197 | err(1, "getlogin"); |
| 198 | |
| 199 | pw = getpwuid(rid = getuid()); |
| 200 | if (pw == NULL((void *)0) || strcmp(login, pw->pw_name)) |
| 201 | (void)printf("login\t%s\n", login); |
| 202 | if (pw) |
| 203 | (void)printf("uid\t%s\n", pw->pw_name); |
| 204 | else |
| 205 | (void)printf("uid\t%u\n", rid); |
| 206 | |
| 207 | if ((eid = geteuid()) != rid) { |
| 208 | if ((pw = getpwuid(eid))) |
| 209 | (void)printf("euid\t%s\n", pw->pw_name); |
| 210 | else |
| 211 | (void)printf("euid\t%u\n", eid); |
| 212 | } |
| 213 | 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' | |
| 214 | if ((gr = getgrgid(rid))) |
| 215 | (void)printf("rgid\t%s\n", gr->gr_name); |
| 216 | else |
| 217 | (void)printf("rgid\t%u\n", rid); |
| 218 | } |
| 219 | (void)printf("groups\t"); |
| 220 | group(NULL((void *)0), 1); |
| 221 | } |
| 222 | if (pw != NULL((void *)0) && pw->pw_class != NULL((void *)0) && *pw->pw_class != '\0') |
| 223 | (void)printf("class\t%s\n", pw->pw_class); |
| 224 | } |
| 225 | |
| 226 | void |
| 227 | current(void) |
| 228 | { |
| 229 | struct group *gr; |
| 230 | struct passwd *pw; |
| 231 | int cnt, ngroups; |
| 232 | uid_t uid, euid; |
| 233 | gid_t groups[NGROUPS_MAX16], gid, egid, lastgid; |
| 234 | char *prefix; |
| 235 | |
| 236 | uid = getuid(); |
| 237 | (void)printf("uid=%u", uid); |
| 238 | if ((pw = getpwuid(uid))) |
| 239 | (void)printf("(%s)", pw->pw_name); |
| 240 | if ((euid = geteuid()) != uid) { |
| 241 | (void)printf(" euid=%u", euid); |
| 242 | if ((pw = getpwuid(euid))) |
| 243 | (void)printf("(%s)", pw->pw_name); |
| 244 | } |
| 245 | gid = getgid(); |
| 246 | (void)printf(" gid=%u", gid); |
| 247 | if ((gr = getgrgid(gid))) |
| 248 | (void)printf("(%s)", gr->gr_name); |
| 249 | if ((egid = getegid()) != gid) { |
| 250 | (void)printf(" egid=%u", egid); |
| 251 | if ((gr = getgrgid(egid))) |
| 252 | (void)printf("(%s)", gr->gr_name); |
| 253 | } |
| 254 | if ((ngroups = getgroups(NGROUPS_MAX16, groups))) { |
| 255 | for (prefix = " groups=", lastgid = (gid_t)-1, cnt = 0; |
| 256 | cnt < ngroups; prefix = ", ", lastgid = gid) { |
| 257 | gid = groups[cnt++]; |
| 258 | if (lastgid == gid) |
| 259 | continue; |
| 260 | (void)printf("%s%u", prefix, gid); |
| 261 | if ((gr = getgrgid(gid))) |
| 262 | (void)printf("(%s)", gr->gr_name); |
| 263 | } |
| 264 | } |
| 265 | (void)printf("\n"); |
| 266 | } |
| 267 | |
| 268 | void |
| 269 | user(struct passwd *pw) |
| 270 | { |
| 271 | gid_t gid, groups[NGROUPS_MAX16 + 1]; |
| 272 | int cnt, ngroups; |
| 273 | uid_t uid; |
| 274 | struct group *gr; |
| 275 | char *prefix; |
| 276 | |
| 277 | uid = pw->pw_uid; |
| 278 | (void)printf("uid=%u(%s)", uid, pw->pw_name); |
| 279 | (void)printf(" gid=%u", pw->pw_gid); |
| 280 | if ((gr = getgrgid(pw->pw_gid))) |
| 281 | (void)printf("(%s)", gr->gr_name); |
| 282 | ngroups = NGROUPS_MAX16 + 1; |
| 283 | (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); |
| 284 | prefix = " groups="; |
| 285 | for (cnt = 0; cnt < ngroups;) { |
| 286 | gid = groups[cnt]; |
| 287 | (void)printf("%s%u", prefix, gid); |
| 288 | prefix = ", "; |
| 289 | if ((gr = getgrgid(gid))) |
| 290 | (void)printf("(%s)", gr->gr_name); |
| 291 | /* Skip same gid entries. */ |
| 292 | while (++cnt < ngroups && gid == groups[cnt]) |
| 293 | ; |
| 294 | } |
| 295 | (void)printf("\n"); |
| 296 | } |
| 297 | |
| 298 | void |
| 299 | group(struct passwd *pw, int nflag) |
| 300 | { |
| 301 | int cnt, ngroups; |
| 302 | gid_t gid, groups[NGROUPS_MAX16 + 1]; |
| 303 | struct group *gr; |
| 304 | char *prefix; |
| 305 | |
| 306 | if (pw) { |
| 307 | ngroups = NGROUPS_MAX16 + 1; |
| 308 | (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); |
| 309 | } else { |
| 310 | groups[0] = getgid(); |
| 311 | ngroups = getgroups(NGROUPS_MAX16, groups + 1) + 1; |
| 312 | } |
| 313 | prefix = ""; |
| 314 | for (cnt = 0; cnt < ngroups;) { |
| 315 | gid = groups[cnt]; |
| 316 | if (nflag) { |
| 317 | if ((gr = getgrgid(gid))) |
| 318 | (void)printf("%s%s", prefix, gr->gr_name); |
| 319 | else |
| 320 | (void)printf("%s%u", prefix, gid); |
| 321 | } else { |
| 322 | (void)printf("%s%u", prefix, gid); |
| 323 | } |
| 324 | prefix = " "; |
| 325 | /* Skip same gid entries. */ |
| 326 | while (++cnt < ngroups && gid == groups[cnt]) |
| 327 | ; |
| 328 | } |
| 329 | (void)printf("\n"); |
| 330 | } |
| 331 | |
| 332 | struct passwd * |
| 333 | who(char *u) |
| 334 | { |
| 335 | struct passwd *pw; |
| 336 | uid_t uid; |
| 337 | const char *errstr; |
| 338 | |
| 339 | /* |
| 340 | * Translate user argument into a pw pointer. First, try to |
| 341 | * get it as specified. If that fails, try it as a number. |
| 342 | */ |
| 343 | if ((pw = getpwnam(u))) |
| 344 | return(pw); |
| 345 | uid = strtonum(u, 0, UID_MAX0xffffffffU, &errstr); |
| 346 | if (!errstr && (pw = getpwuid(uid))) |
| 347 | return(pw); |
| 348 | errx(1, "%s: No such user", u); |
| 349 | /* NOTREACHED */ |
| 350 | } |
| 351 | |
| 352 | void |
| 353 | usage(void) |
| 354 | { |
| 355 | if (strcmp(getprogname(), "groups") == 0) { |
| 356 | (void)fprintf(stderr(&__sF[2]), "usage: groups [user]\n"); |
| 357 | } else if (strcmp(getprogname(), "whoami") == 0) { |
| 358 | (void)fprintf(stderr(&__sF[2]), "usage: whoami\n"); |
| 359 | } else { |
| 360 | (void)fprintf(stderr(&__sF[2]), "usage: id [user]\n"); |
| 361 | (void)fprintf(stderr(&__sF[2]), " id -c [user]\n"); |
| 362 | (void)fprintf(stderr(&__sF[2]), " id -G [-n] [user]\n"); |
| 363 | (void)fprintf(stderr(&__sF[2]), " id -g [-nr] [user]\n"); |
| 364 | (void)fprintf(stderr(&__sF[2]), " id -p [user]\n"); |
| 365 | (void)fprintf(stderr(&__sF[2]), " id -R\n"); |
| 366 | (void)fprintf(stderr(&__sF[2]), " id -u [-nr] [user]\n"); |
| 367 | } |
| 368 | exit(1); |
| 369 | } |