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 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 /*static char sccsid[] = "from: @(#)id.c 8.2 (Berkeley) 2/16/94";*/ 42 static char *rcsid = "$Id: id.c,v 1.6 1994/10/06 15:43:08 mycroft Exp $"; 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 47 #include <errno.h> 48 #include <grp.h> 49 #include <pwd.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 void current __P((void)); 56 void err __P((const char *, ...)); 57 void pretty __P((struct passwd *)); 58 void group __P((struct passwd *, int)); 59 void usage __P((void)); 60 void user __P((struct passwd *)); 61 struct passwd * 62 who __P((char *)); 63 64 int 65 main(argc, argv) 66 int argc; 67 char *argv[]; 68 { 69 struct group *gr; 70 struct passwd *pw; 71 int Gflag, ch, gflag, id, nflag, pflag, rflag, uflag; 72 73 Gflag = gflag = nflag = pflag = rflag = uflag = 0; 74 while ((ch = getopt(argc, argv, "Ggnpru")) != EOF) 75 switch(ch) { 76 case 'G': 77 Gflag = 1; 78 break; 79 case 'g': 80 gflag = 1; 81 break; 82 case 'n': 83 nflag = 1; 84 break; 85 case 'p': 86 pflag = 1; 87 break; 88 case 'r': 89 rflag = 1; 90 break; 91 case 'u': 92 uflag = 1; 93 break; 94 case '?': 95 default: 96 usage(); 97 } 98 argc -= optind; 99 argv += optind; 100 101 switch(Gflag + gflag + pflag + uflag) { 102 case 1: 103 break; 104 case 0: 105 if (!nflag && !rflag) 106 break; 107 /* FALLTHROUGH */ 108 default: 109 usage(); 110 } 111 112 pw = *argv ? who(*argv) : NULL; 113 114 if (gflag) { 115 id = pw ? pw->pw_gid : rflag ? getgid() : getegid(); 116 if (nflag && (gr = getgrgid(id))) 117 (void)printf("%s\n", gr->gr_name); 118 else 119 (void)printf("%u\n", id); 120 exit(0); 121 } 122 123 if (uflag) { 124 id = pw ? pw->pw_uid : rflag ? getuid() : geteuid(); 125 if (nflag && (pw = getpwuid(id))) 126 (void)printf("%s\n", pw->pw_name); 127 else 128 (void)printf("%u\n", id); 129 exit(0); 130 } 131 132 if (Gflag) { 133 group(pw, nflag); 134 exit(0); 135 } 136 137 if (pflag) { 138 pretty(pw); 139 exit(0); 140 } 141 142 if (pw) 143 user(pw); 144 else 145 current(); 146 exit(0); 147 } 148 149 void 150 pretty(pw) 151 struct passwd *pw; 152 { 153 struct group *gr; 154 u_int eid, rid; 155 char *login; 156 157 if (pw) { 158 (void)printf("uid\t%s\n", pw->pw_name); 159 (void)printf("groups\t"); 160 group(pw, 1); 161 } else { 162 if ((login = getlogin()) == NULL) 163 err("getlogin: %s", strerror(errno)); 164 165 pw = getpwuid(rid = getuid()); 166 if (pw == NULL || strcmp(login, pw->pw_name)) 167 (void)printf("login\t%s\n", login); 168 if (pw) 169 (void)printf("uid\t%s\n", pw->pw_name); 170 else 171 (void)printf("uid\t%u\n", rid); 172 173 if ((eid = geteuid()) != rid) 174 if (pw = getpwuid(eid)) 175 (void)printf("euid\t%s", pw->pw_name); 176 else 177 (void)printf("euid\t%u", eid); 178 if ((rid = getgid()) != (eid = getegid())) 179 if (gr = getgrgid(rid)) 180 (void)printf("rgid\t%s\n", gr->gr_name); 181 else 182 (void)printf("rgid\t%u\n", rid); 183 (void)printf("groups\t"); 184 group(NULL, 1); 185 } 186 } 187 188 void 189 current() 190 { 191 struct group *gr; 192 struct passwd *pw; 193 int cnt, id, eid, lastid, ngroups; 194 gid_t groups[NGROUPS]; 195 char *fmt; 196 197 id = getuid(); 198 (void)printf("uid=%u", id); 199 if (pw = getpwuid(id)) 200 (void)printf("(%s)", pw->pw_name); 201 if ((eid = geteuid()) != id) { 202 (void)printf(" euid=%u", eid); 203 if (pw = getpwuid(eid)) 204 (void)printf("(%s)", pw->pw_name); 205 } 206 id = getgid(); 207 (void)printf(" gid=%u", id); 208 if (gr = getgrgid(id)) 209 (void)printf("(%s)", gr->gr_name); 210 if ((eid = getegid()) != id) { 211 (void)printf(" egid=%u", eid); 212 if (gr = getgrgid(eid)) 213 (void)printf("(%s)", gr->gr_name); 214 } 215 if (ngroups = getgroups(NGROUPS, groups)) { 216 for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups; 217 fmt = ", %u", lastid = id) { 218 id = groups[cnt++]; 219 if (lastid == id) 220 continue; 221 (void)printf(fmt, id); 222 if (gr = getgrgid(id)) 223 (void)printf("(%s)", gr->gr_name); 224 } 225 } 226 (void)printf("\n"); 227 } 228 229 void 230 user(pw) 231 register struct passwd *pw; 232 { 233 register struct group *gr; 234 register char *fmt, **p; 235 int cnt, id, lastid, ngroups, groups[NGROUPS + 1]; 236 237 id = pw->pw_uid; 238 (void)printf("uid=%u(%s)", id, pw->pw_name); 239 (void)printf(" gid=%u", pw->pw_gid); 240 if (gr = getgrgid(pw->pw_gid)) 241 (void)printf("(%s)", gr->gr_name); 242 ngroups = NGROUPS + 1; 243 (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); 244 fmt = " groups=%u"; 245 for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) { 246 if (lastid == (id = groups[cnt])) 247 continue; 248 (void)printf(fmt, id); 249 fmt = " %u"; 250 if (gr = getgrgid(id)) 251 (void)printf("(%s)", gr->gr_name); 252 lastid = id; 253 } 254 (void)printf("\n"); 255 } 256 257 void 258 group(pw, nflag) 259 struct passwd *pw; 260 int nflag; 261 { 262 struct group *gr; 263 int cnt, id, lastid, ngroups; 264 gid_t groups[NGROUPS + 1]; 265 char *fmt; 266 267 if (pw) { 268 ngroups = NGROUPS + 1; 269 (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); 270 } else { 271 groups[0] = getgid(); 272 ngroups = getgroups(NGROUPS, groups + 1) + 1; 273 } 274 fmt = nflag ? "%s" : "%u"; 275 for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) { 276 if (lastid == (id = groups[cnt])) 277 continue; 278 if (nflag) { 279 if (gr = getgrgid(id)) 280 (void)printf(fmt, gr->gr_name); 281 else 282 (void)printf(*fmt == ' ' ? " %u" : "%u", 283 id); 284 fmt = " %s"; 285 } else { 286 (void)printf(fmt, id); 287 fmt = " %u"; 288 } 289 lastid = id; 290 } 291 (void)printf("\n"); 292 } 293 294 struct passwd * 295 who(u) 296 char *u; 297 { 298 struct passwd *pw; 299 long id; 300 char *ep; 301 302 /* 303 * Translate user argument into a pw pointer. First, try to 304 * get it as specified. If that fails, try it as a number. 305 */ 306 if (pw = getpwnam(u)) 307 return(pw); 308 id = strtol(u, &ep, 10); 309 if (*u && !*ep && (pw = getpwuid(id))) 310 return(pw); 311 err("%s: No such user", u); 312 /* NOTREACHED */ 313 } 314 315 #if __STDC__ 316 #include <stdarg.h> 317 #else 318 #include <varargs.h> 319 #endif 320 321 void 322 #if __STDC__ 323 err(const char *fmt, ...) 324 #else 325 err(fmt, va_alist) 326 char *fmt; 327 va_dcl 328 #endif 329 { 330 va_list ap; 331 #if __STDC__ 332 va_start(ap, fmt); 333 #else 334 va_start(ap); 335 #endif 336 (void)fprintf(stderr, "id: "); 337 (void)vfprintf(stderr, fmt, ap); 338 va_end(ap); 339 (void)fprintf(stderr, "\n"); 340 exit(1); 341 /* NOTREACHED */ 342 } 343 344 void 345 usage() 346 { 347 (void)fprintf(stderr, "usage: id [user]\n"); 348 (void)fprintf(stderr, " id -G [-n] [user]\n"); 349 (void)fprintf(stderr, " id -g [-nr] [user]\n"); 350 (void)fprintf(stderr, " id -u [-nr] [user]\n"); 351 exit(1); 352 } 353