1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1991, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)id.c 8.2 (Berkeley) 2/16/94"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 #include <sys/param.h> 49 50 #include <err.h> 51 #include <grp.h> 52 #include <pwd.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 int main(int, char *[]); 59 void current(void); 60 void pline(struct passwd *); 61 void pretty(struct passwd *); 62 void group(struct passwd *, int); 63 void usage(void); 64 void user(struct passwd *); 65 struct passwd * 66 who(char *); 67 68 int isgroups, iswhoami; 69 70 int 71 main(argc, argv) 72 int argc; 73 char *argv[]; 74 { 75 struct group *gr; 76 struct passwd *pw; 77 int Gflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag; 78 const char *myname; 79 80 Gflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0; 81 82 myname = strrchr(argv[0], '/'); 83 myname = (myname != NULL) ? myname + 1 : argv[0]; 84 if (strcmp(myname, "groups") == 0) { 85 isgroups = 1; 86 Gflag = nflag = 1; 87 } 88 else if (strcmp(myname, "whoami") == 0) { 89 iswhoami = 1; 90 uflag = nflag = 1; 91 } 92 93 while ((ch = getopt(argc, argv, 94 (isgroups || iswhoami) ? "" : "PGgnpru")) != -1) 95 switch(ch) { 96 case 'G': 97 Gflag = 1; 98 break; 99 case 'P': 100 Pflag = 1; 101 break; 102 case 'g': 103 gflag = 1; 104 break; 105 case 'n': 106 nflag = 1; 107 break; 108 case 'p': 109 pflag = 1; 110 break; 111 case 'r': 112 rflag = 1; 113 break; 114 case 'u': 115 uflag = 1; 116 break; 117 case '?': 118 default: 119 usage(); 120 } 121 argc -= optind; 122 argv += optind; 123 124 if (iswhoami && argc > 0) 125 usage(); 126 127 switch(Gflag + Pflag + gflag + pflag + uflag) { 128 case 1: 129 break; 130 case 0: 131 if (!nflag && !rflag) 132 break; 133 /* FALLTHROUGH */ 134 default: 135 usage(); 136 } 137 138 pw = *argv ? who(*argv) : NULL; 139 140 if (gflag) { 141 id = pw ? pw->pw_gid : rflag ? getgid() : getegid(); 142 if (nflag && (gr = getgrgid(id))) 143 (void)printf("%s\n", gr->gr_name); 144 else 145 (void)printf("%u\n", id); 146 exit(0); 147 } 148 149 if (uflag) { 150 id = pw ? pw->pw_uid : rflag ? getuid() : geteuid(); 151 if (nflag && (pw = getpwuid(id))) 152 (void)printf("%s\n", pw->pw_name); 153 else 154 (void)printf("%u\n", id); 155 exit(0); 156 } 157 158 if (Gflag) { 159 group(pw, nflag); 160 exit(0); 161 } 162 163 if (Pflag) { 164 pline(pw); 165 exit(0); 166 } 167 168 if (pflag) { 169 pretty(pw); 170 exit(0); 171 } 172 173 if (pw) 174 user(pw); 175 else 176 current(); 177 exit(0); 178 } 179 180 void 181 pretty(pw) 182 struct passwd *pw; 183 { 184 struct group *gr; 185 u_int eid, rid; 186 char *login; 187 188 if (pw) { 189 (void)printf("uid\t%s\n", pw->pw_name); 190 (void)printf("groups\t"); 191 group(pw, 1); 192 } else { 193 if ((login = getlogin()) == NULL) 194 err(1, "getlogin"); 195 196 pw = getpwuid(rid = getuid()); 197 if (pw == NULL || strcmp(login, pw->pw_name)) 198 (void)printf("login\t%s\n", login); 199 if (pw) 200 (void)printf("uid\t%s\n", pw->pw_name); 201 else 202 (void)printf("uid\t%u\n", rid); 203 204 if ((eid = geteuid()) != rid) { 205 if ((pw = getpwuid(eid))) 206 (void)printf("euid\t%s\n", pw->pw_name); 207 else 208 (void)printf("euid\t%u\n", eid); 209 } 210 if ((rid = getgid()) != (eid = getegid())) { 211 if ((gr = getgrgid(rid))) 212 (void)printf("rgid\t%s\n", gr->gr_name); 213 else 214 (void)printf("rgid\t%u\n", rid); 215 } 216 (void)printf("groups\t"); 217 group(NULL, 1); 218 } 219 } 220 221 void 222 current() 223 { 224 struct group *gr; 225 struct passwd *pw; 226 int cnt, id, eid, lastid, ngroups; 227 gid_t groups[NGROUPS]; 228 const char *fmt; 229 230 id = getuid(); 231 (void)printf("uid=%u", id); 232 if ((pw = getpwuid(id))) 233 (void)printf("(%s)", pw->pw_name); 234 if ((eid = geteuid()) != id) { 235 (void)printf(" euid=%u", eid); 236 if ((pw = getpwuid(eid))) 237 (void)printf("(%s)", pw->pw_name); 238 } 239 id = getgid(); 240 (void)printf(" gid=%u", id); 241 if ((gr = getgrgid(id))) 242 (void)printf("(%s)", gr->gr_name); 243 if ((eid = getegid()) != id) { 244 (void)printf(" egid=%u", eid); 245 if ((gr = getgrgid(eid))) 246 (void)printf("(%s)", gr->gr_name); 247 } 248 if ((ngroups = getgroups(NGROUPS, groups))) { 249 for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups; 250 fmt = ", %u", lastid = id) { 251 id = groups[cnt++]; 252 if (lastid == id) 253 continue; 254 (void)printf(fmt, id); 255 if ((gr = getgrgid(id))) 256 (void)printf("(%s)", gr->gr_name); 257 } 258 } 259 (void)printf("\n"); 260 } 261 262 void 263 user(pw) 264 struct passwd *pw; 265 { 266 struct group *gr; 267 const char *fmt; 268 int cnt, gid, lastgid, ngroups, groups[NGROUPS + 1]; 269 270 (void)printf("uid=%u(%s)", pw->pw_uid, pw->pw_name); 271 gid = pw->pw_gid; 272 (void)printf(" gid=%u", gid); 273 if ((gr = getgrgid(gid))) 274 (void)printf("(%s)", gr->gr_name); 275 ngroups = NGROUPS + 1; 276 (void) getgrouplist(pw->pw_name, gid, groups, &ngroups); 277 fmt = " groups=%u"; 278 for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) { 279 if (lastgid == (gid = groups[cnt])) 280 continue; 281 (void)printf(fmt, gid); 282 fmt = ", %u"; 283 if ((gr = getgrgid(gid))) 284 (void)printf("(%s)", gr->gr_name); 285 lastgid = gid; 286 } 287 (void)printf("\n"); 288 } 289 290 void 291 group(pw, nflag) 292 struct passwd *pw; 293 int nflag; 294 { 295 struct group *gr; 296 int cnt, id, lastid, ngroups; 297 gid_t groups[NGROUPS + 1]; 298 const char *fmt; 299 300 if (pw) { 301 ngroups = NGROUPS + 1; 302 (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); 303 } else { 304 groups[0] = getgid(); 305 ngroups = getgroups(NGROUPS, groups + 1) + 1; 306 } 307 fmt = nflag ? "%s" : "%u"; 308 for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) { 309 if (lastid == (id = groups[cnt])) 310 continue; 311 if (nflag) { 312 if ((gr = getgrgid(id))) 313 (void)printf(fmt, gr->gr_name); 314 else 315 (void)printf(*fmt == ' ' ? " %u" : "%u", 316 id); 317 fmt = " %s"; 318 } else { 319 (void)printf(fmt, id); 320 fmt = " %u"; 321 } 322 lastid = id; 323 } 324 (void)printf("\n"); 325 } 326 327 struct passwd * 328 who(u) 329 char *u; 330 { 331 struct passwd *pw; 332 long id; 333 char *ep; 334 335 /* 336 * Translate user argument into a pw pointer. First, try to 337 * get it as specified. If that fails, try it as a number. 338 */ 339 if ((pw = getpwnam(u))) 340 return(pw); 341 id = strtol(u, &ep, 10); 342 if (*u && !*ep && (pw = getpwuid(id))) 343 return(pw); 344 errx(1, "%s: no such user", u); 345 /* NOTREACHED */ 346 } 347 348 void 349 pline(pw) 350 struct passwd *pw; 351 { 352 u_int rid; 353 354 if (!pw) { 355 if ((pw = getpwuid(rid = getuid())) == NULL) 356 err(1, "getpwuid"); 357 } 358 359 (void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name, 360 pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class, 361 (long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos, 362 pw->pw_dir, pw->pw_shell); 363 } 364 365 366 void 367 usage() 368 { 369 370 if (isgroups) 371 (void)fprintf(stderr, "usage: groups [user]\n"); 372 else if (iswhoami) 373 (void)fprintf(stderr, "usage: whoami\n"); 374 else 375 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n", 376 "usage: id [user]", 377 " id -G [-n] [user]", 378 " id -P [user]", 379 " id -g [-nr] [user]", 380 " id -p [user]", 381 " id -u [-nr] [user]"); 382 exit(1); 383 } 384