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