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 __P((int, char *[])); 59 void current __P((void)); 60 void pline __P((struct passwd *)); 61 void pretty __P((struct passwd *)); 62 void group __P((struct passwd *, int)); 63 void usage __P((void)); 64 void user __P((struct passwd *)); 65 struct passwd * 66 who __P((char *)); 67 68 int 69 main(argc, argv) 70 int argc; 71 char *argv[]; 72 { 73 struct group *gr; 74 struct passwd *pw; 75 int Gflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag; 76 77 Gflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0; 78 while ((ch = getopt(argc, argv, "PGgnpru")) != -1) 79 switch(ch) { 80 case 'G': 81 Gflag = 1; 82 break; 83 case 'P': 84 Pflag = 1; 85 break; 86 case 'g': 87 gflag = 1; 88 break; 89 case 'n': 90 nflag = 1; 91 break; 92 case 'p': 93 pflag = 1; 94 break; 95 case 'r': 96 rflag = 1; 97 break; 98 case 'u': 99 uflag = 1; 100 break; 101 case '?': 102 default: 103 usage(); 104 } 105 argc -= optind; 106 argv += optind; 107 108 switch(Gflag + Pflag + gflag + pflag + uflag) { 109 case 1: 110 break; 111 case 0: 112 if (!nflag && !rflag) 113 break; 114 /* FALLTHROUGH */ 115 default: 116 usage(); 117 } 118 119 pw = *argv ? who(*argv) : NULL; 120 121 if (gflag) { 122 id = pw ? pw->pw_gid : rflag ? getgid() : getegid(); 123 if (nflag && (gr = getgrgid(id))) 124 (void)printf("%s\n", gr->gr_name); 125 else 126 (void)printf("%u\n", id); 127 exit(0); 128 } 129 130 if (uflag) { 131 id = pw ? pw->pw_uid : rflag ? getuid() : geteuid(); 132 if (nflag && (pw = getpwuid(id))) 133 (void)printf("%s\n", pw->pw_name); 134 else 135 (void)printf("%u\n", id); 136 exit(0); 137 } 138 139 if (Gflag) { 140 group(pw, nflag); 141 exit(0); 142 } 143 144 if (Pflag) { 145 pline(pw); 146 exit(0); 147 } 148 149 if (pflag) { 150 pretty(pw); 151 exit(0); 152 } 153 154 if (pw) 155 user(pw); 156 else 157 current(); 158 exit(0); 159 } 160 161 void 162 pretty(pw) 163 struct passwd *pw; 164 { 165 struct group *gr; 166 u_int eid, rid; 167 char *login; 168 169 if (pw) { 170 (void)printf("uid\t%s\n", pw->pw_name); 171 (void)printf("groups\t"); 172 group(pw, 1); 173 } else { 174 if ((login = getlogin()) == NULL) 175 err(1, "getlogin"); 176 177 pw = getpwuid(rid = getuid()); 178 if (pw == NULL || strcmp(login, pw->pw_name)) 179 (void)printf("login\t%s\n", login); 180 if (pw) 181 (void)printf("uid\t%s\n", pw->pw_name); 182 else 183 (void)printf("uid\t%u\n", rid); 184 185 if ((eid = geteuid()) != rid) { 186 if ((pw = getpwuid(eid))) 187 (void)printf("euid\t%s\n", pw->pw_name); 188 else 189 (void)printf("euid\t%u\n", eid); 190 } 191 if ((rid = getgid()) != (eid = getegid())) { 192 if ((gr = getgrgid(rid))) 193 (void)printf("rgid\t%s\n", gr->gr_name); 194 else 195 (void)printf("rgid\t%u\n", rid); 196 } 197 (void)printf("groups\t"); 198 group(NULL, 1); 199 } 200 } 201 202 void 203 current() 204 { 205 struct group *gr; 206 struct passwd *pw; 207 int cnt, id, eid, lastid, ngroups; 208 gid_t groups[NGROUPS]; 209 const char *fmt; 210 211 id = getuid(); 212 (void)printf("uid=%u", id); 213 if ((pw = getpwuid(id))) 214 (void)printf("(%s)", pw->pw_name); 215 if ((eid = geteuid()) != id) { 216 (void)printf(" euid=%u", eid); 217 if ((pw = getpwuid(eid))) 218 (void)printf("(%s)", pw->pw_name); 219 } 220 id = getgid(); 221 (void)printf(" gid=%u", id); 222 if ((gr = getgrgid(id))) 223 (void)printf("(%s)", gr->gr_name); 224 if ((eid = getegid()) != id) { 225 (void)printf(" egid=%u", eid); 226 if ((gr = getgrgid(eid))) 227 (void)printf("(%s)", gr->gr_name); 228 } 229 if ((ngroups = getgroups(NGROUPS, groups))) { 230 for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups; 231 fmt = ", %u", lastid = id) { 232 id = groups[cnt++]; 233 if (lastid == id) 234 continue; 235 (void)printf(fmt, id); 236 if ((gr = getgrgid(id))) 237 (void)printf("(%s)", gr->gr_name); 238 } 239 } 240 (void)printf("\n"); 241 } 242 243 void 244 user(pw) 245 struct passwd *pw; 246 { 247 struct group *gr; 248 const char *fmt; 249 int cnt, gid, lastgid, ngroups, groups[NGROUPS + 1]; 250 251 (void)printf("uid=%u(%s)", pw->pw_uid, pw->pw_name); 252 gid = pw->pw_gid; 253 (void)printf(" gid=%u", gid); 254 if ((gr = getgrgid(gid))) 255 (void)printf("(%s)", gr->gr_name); 256 ngroups = NGROUPS + 1; 257 (void) getgrouplist(pw->pw_name, gid, groups, &ngroups); 258 fmt = " groups=%u"; 259 for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) { 260 if (lastgid == (gid = groups[cnt])) 261 continue; 262 (void)printf(fmt, gid); 263 fmt = ", %u"; 264 if ((gr = getgrgid(gid))) 265 (void)printf("(%s)", gr->gr_name); 266 lastgid = gid; 267 } 268 (void)printf("\n"); 269 } 270 271 void 272 group(pw, nflag) 273 struct passwd *pw; 274 int nflag; 275 { 276 struct group *gr; 277 int cnt, id, lastid, ngroups; 278 gid_t groups[NGROUPS + 1]; 279 const char *fmt; 280 281 if (pw) { 282 ngroups = NGROUPS + 1; 283 (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); 284 } else { 285 groups[0] = getgid(); 286 ngroups = getgroups(NGROUPS, groups + 1) + 1; 287 } 288 fmt = nflag ? "%s" : "%u"; 289 for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) { 290 if (lastid == (id = groups[cnt])) 291 continue; 292 if (nflag) { 293 if ((gr = getgrgid(id))) 294 (void)printf(fmt, gr->gr_name); 295 else 296 (void)printf(*fmt == ' ' ? " %u" : "%u", 297 id); 298 fmt = " %s"; 299 } else { 300 (void)printf(fmt, id); 301 fmt = " %u"; 302 } 303 lastid = id; 304 } 305 (void)printf("\n"); 306 } 307 308 struct passwd * 309 who(u) 310 char *u; 311 { 312 struct passwd *pw; 313 long id; 314 char *ep; 315 316 /* 317 * Translate user argument into a pw pointer. First, try to 318 * get it as specified. If that fails, try it as a number. 319 */ 320 if ((pw = getpwnam(u))) 321 return(pw); 322 id = strtol(u, &ep, 10); 323 if (*u && !*ep && (pw = getpwuid(id))) 324 return(pw); 325 errx(1, "%s: no such user", u); 326 /* NOTREACHED */ 327 } 328 329 void 330 pline(pw) 331 struct passwd *pw; 332 { 333 u_int rid; 334 335 if (!pw) { 336 if ((pw = getpwuid(rid = getuid())) == NULL) 337 err(1, "getpwuid"); 338 } 339 340 (void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name, 341 pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class, 342 (long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos, 343 pw->pw_dir, pw->pw_shell); 344 } 345 346 347 void 348 usage() 349 { 350 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n", 351 "usage: id [user]", 352 " id -G [-n] [user]", 353 " id -P [user]", 354 " id -g [-nr] [user]", 355 " id -p [user]", 356 " id -u [-nr] [user]"); 357 exit(1); 358 } 359