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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1991, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)id.c 8.2 (Berkeley) 2/16/94 31 * $FreeBSD: src/usr.bin/id/id.c,v 1.12.2.3 2001/12/20 12:09:03 ru Exp $ 32 */ 33 34 #include <sys/param.h> 35 36 #include <err.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 44 static void current(void); 45 static void pline(struct passwd *); 46 static void pretty(struct passwd *); 47 static void group(struct passwd *, int); 48 static void usage(void); 49 static void user(struct passwd *); 50 static struct passwd * 51 who(char *); 52 53 int isgroups, iswhoami; 54 55 int 56 main(int argc, char **argv) 57 { 58 struct group *gr; 59 struct passwd *pw; 60 int Gflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag; 61 const char *myname; 62 63 Gflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0; 64 65 myname = strrchr(argv[0], '/'); 66 myname = (myname != NULL) ? myname + 1 : argv[0]; 67 if (strcmp(myname, "groups") == 0) { 68 isgroups = 1; 69 Gflag = nflag = 1; 70 } 71 else if (strcmp(myname, "whoami") == 0) { 72 iswhoami = 1; 73 uflag = nflag = 1; 74 } 75 76 while ((ch = getopt(argc, argv, 77 (isgroups || iswhoami) ? "" : "PGgnpru")) != -1) 78 switch(ch) { 79 case 'G': 80 Gflag = 1; 81 break; 82 case 'P': 83 Pflag = 1; 84 break; 85 case 'g': 86 gflag = 1; 87 break; 88 case 'n': 89 nflag = 1; 90 break; 91 case 'p': 92 pflag = 1; 93 break; 94 case 'r': 95 rflag = 1; 96 break; 97 case 'u': 98 uflag = 1; 99 break; 100 case '?': 101 default: 102 usage(); 103 } 104 argc -= optind; 105 argv += optind; 106 107 if (iswhoami && argc > 0) 108 usage(); 109 110 switch(Gflag + Pflag + gflag + pflag + uflag) { 111 case 1: 112 break; 113 case 0: 114 if (!nflag && !rflag) 115 break; 116 /* FALLTHROUGH */ 117 default: 118 usage(); 119 } 120 121 pw = *argv ? who(*argv) : NULL; 122 123 if (gflag) { 124 id = pw ? pw->pw_gid : rflag ? getgid() : getegid(); 125 if (nflag && (gr = getgrgid(id))) 126 printf("%s\n", gr->gr_name); 127 else 128 printf("%u\n", id); 129 exit(0); 130 } 131 132 if (uflag) { 133 id = pw ? pw->pw_uid : rflag ? getuid() : geteuid(); 134 if (nflag && (pw = getpwuid(id))) 135 printf("%s\n", pw->pw_name); 136 else 137 printf("%u\n", id); 138 exit(0); 139 } 140 141 if (Gflag) { 142 group(pw, nflag); 143 exit(0); 144 } 145 146 if (Pflag) { 147 pline(pw); 148 exit(0); 149 } 150 151 if (pflag) { 152 pretty(pw); 153 exit(0); 154 } 155 156 if (pw) 157 user(pw); 158 else 159 current(); 160 exit(0); 161 } 162 163 static void 164 pretty(struct passwd *pw) 165 { 166 struct group *gr; 167 u_int eid, rid; 168 char *login; 169 170 if (pw) { 171 printf("uid\t%s\n", pw->pw_name); 172 printf("groups\t"); 173 group(pw, 1); 174 } else { 175 if ((login = getlogin()) == NULL) 176 err(1, "getlogin"); 177 178 pw = getpwuid(rid = getuid()); 179 if (pw == NULL || strcmp(login, pw->pw_name)) 180 printf("login\t%s\n", login); 181 if (pw) 182 printf("uid\t%s\n", pw->pw_name); 183 else 184 printf("uid\t%u\n", rid); 185 186 if ((eid = geteuid()) != rid) { 187 if ((pw = getpwuid(eid))) 188 printf("euid\t%s\n", pw->pw_name); 189 else 190 printf("euid\t%u\n", eid); 191 } 192 if ((rid = getgid()) != (eid = getegid())) { 193 if ((gr = getgrgid(rid))) 194 printf("rgid\t%s\n", gr->gr_name); 195 else 196 printf("rgid\t%u\n", rid); 197 } 198 printf("groups\t"); 199 group(NULL, 1); 200 } 201 } 202 203 static void 204 current(void) 205 { 206 struct group *gr; 207 struct passwd *pw; 208 int cnt, id, eid, lastid, ngroups; 209 gid_t groups[NGROUPS]; 210 const char *fmt; 211 212 id = getuid(); 213 printf("uid=%u", id); 214 if ((pw = getpwuid(id))) 215 printf("(%s)", pw->pw_name); 216 if ((eid = geteuid()) != id) { 217 printf(" euid=%u", eid); 218 if ((pw = getpwuid(eid))) 219 printf("(%s)", pw->pw_name); 220 } 221 id = getgid(); 222 printf(" gid=%u", id); 223 if ((gr = getgrgid(id))) 224 printf("(%s)", gr->gr_name); 225 if ((eid = getegid()) != id) { 226 printf(" egid=%u", eid); 227 if ((gr = getgrgid(eid))) 228 printf("(%s)", gr->gr_name); 229 } 230 if ((ngroups = getgroups(NGROUPS, groups))) { 231 for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups; 232 fmt = ", %u", lastid = id) { 233 id = groups[cnt++]; 234 if (lastid == id) 235 continue; 236 printf(fmt, id); 237 if ((gr = getgrgid(id))) 238 printf("(%s)", gr->gr_name); 239 } 240 } 241 printf("\n"); 242 } 243 244 static void 245 user(struct passwd *pw) 246 { 247 struct group *gr; 248 const char *fmt; 249 int cnt, ngroups; 250 gid_t gid, lastgid, groups[NGROUPS + 1]; 251 252 printf("uid=%u(%s)", pw->pw_uid, pw->pw_name); 253 gid = pw->pw_gid; 254 printf(" gid=%u", gid); 255 if ((gr = getgrgid(gid))) 256 printf("(%s)", gr->gr_name); 257 ngroups = NGROUPS + 1; 258 getgrouplist(pw->pw_name, gid, groups, &ngroups); 259 fmt = " groups=%u"; 260 for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) { 261 if (lastgid == (gid = groups[cnt])) 262 continue; 263 printf(fmt, gid); 264 fmt = ", %u"; 265 if ((gr = getgrgid(gid))) 266 printf("(%s)", gr->gr_name); 267 lastgid = gid; 268 } 269 printf("\n"); 270 } 271 272 static void 273 group(struct passwd *pw, int nflag) 274 { 275 struct group *gr; 276 int cnt, id, lastid, ngroups; 277 gid_t groups[NGROUPS + 1]; 278 const char *fmt; 279 280 if (pw) { 281 ngroups = NGROUPS + 1; 282 getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); 283 } else { 284 groups[0] = getgid(); 285 ngroups = getgroups(NGROUPS, groups + 1) + 1; 286 } 287 fmt = nflag ? "%s" : "%u"; 288 for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) { 289 if (lastid == (id = groups[cnt])) 290 continue; 291 if (nflag) { 292 if ((gr = getgrgid(id))) 293 printf(fmt, gr->gr_name); 294 else 295 printf(*fmt == ' ' ? " %u" : "%u", 296 id); 297 fmt = " %s"; 298 } else { 299 printf(fmt, id); 300 fmt = " %u"; 301 } 302 lastid = id; 303 } 304 printf("\n"); 305 } 306 307 static struct passwd * 308 who(char *u) 309 { 310 struct passwd *pw; 311 long id; 312 char *ep; 313 314 /* 315 * Translate user argument into a pw pointer. First, try to 316 * get it as specified. If that fails, try it as a number. 317 */ 318 if ((pw = getpwnam(u))) 319 return(pw); 320 id = strtol(u, &ep, 10); 321 if (*u && !*ep && (pw = getpwuid(id))) 322 return(pw); 323 errx(1, "%s: no such user", u); 324 /* NOTREACHED */ 325 } 326 327 static void 328 pline(struct passwd *pw) 329 { 330 u_int rid; 331 332 if (!pw) { 333 if ((pw = getpwuid(rid = getuid())) == NULL) 334 err(1, "getpwuid"); 335 } 336 337 printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name, 338 pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class, 339 (long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos, 340 pw->pw_dir, pw->pw_shell); 341 } 342 343 344 static void 345 usage(void) 346 { 347 348 if (isgroups) 349 fprintf(stderr, "usage: groups [user]\n"); 350 else if (iswhoami) 351 fprintf(stderr, "usage: whoami\n"); 352 else 353 fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n", 354 "usage: id [user]", 355 " id -G [-n] [user]", 356 " id -P [user]", 357 " id -g [-nr] [user]", 358 " id -p [user]", 359 " id -u [-nr] [user]"); 360 exit(1); 361 } 362