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 30 #include <sys/cdefs.h> 31 #ifndef lint 32 __COPYRIGHT("@(#) Copyright (c) 1991, 1993\n\ 33 The Regents of the University of California. All rights reserved.\n"); 34 #endif /* not lint */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)id.c 8.3 (Berkeley) 4/28/95"; 39 #else 40 __RCSID("$NetBSD: id.c,v 1.24 2004/11/22 17:31:38 peter Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 46 #include <err.h> 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 static void current(void); 56 static void pretty(struct passwd *); 57 static void group(struct passwd *, int); 58 static void usage(void); 59 static void user(struct passwd *); 60 static struct passwd *who(char *); 61 62 static int maxgroups; 63 static gid_t *groups; 64 65 int 66 main(int argc, char *argv[]) 67 { 68 struct group *gr; 69 struct passwd *pw; 70 int ch, id; 71 int Gflag, gflag, nflag, pflag, rflag, uflag; 72 73 Gflag = gflag = nflag = pflag = rflag = uflag = 0; 74 75 if (strcmp(getprogname(), "groups") == 0) { 76 Gflag = 1; 77 nflag = 1; 78 } else if (strcmp(getprogname(), "whoami") == 0) { 79 uflag = 1; 80 nflag = 1; 81 } 82 83 while ((ch = getopt(argc, argv, "Ggnpru")) != -1) 84 switch (ch) { 85 case 'G': 86 Gflag = 1; 87 break; 88 case 'g': 89 gflag = 1; 90 break; 91 case 'n': 92 nflag = 1; 93 break; 94 case 'p': 95 pflag = 1; 96 break; 97 case 'r': 98 rflag = 1; 99 break; 100 case 'u': 101 uflag = 1; 102 break; 103 case '?': 104 default: 105 usage(); 106 } 107 argc -= optind; 108 argv += optind; 109 110 switch (Gflag + 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 maxgroups = sysconf(_SC_NGROUPS_MAX); 124 if ((groups = malloc((maxgroups + 1) * sizeof(gid_t))) == NULL) 125 err(1, NULL); 126 127 if (gflag) { 128 id = pw ? pw->pw_gid : rflag ? getgid() : getegid(); 129 if (nflag && (gr = getgrgid(id))) 130 (void)printf("%s\n", gr->gr_name); 131 else 132 (void)printf("%u\n", id); 133 goto done; 134 } 135 136 if (uflag) { 137 id = pw ? pw->pw_uid : rflag ? getuid() : geteuid(); 138 if (nflag && (pw = getpwuid(id))) 139 (void)printf("%s\n", pw->pw_name); 140 else 141 (void)printf("%u\n", id); 142 goto done; 143 } 144 145 if (Gflag) { 146 group(pw, nflag); 147 goto done; 148 } 149 150 if (pflag) { 151 pretty(pw); 152 goto done; 153 } 154 155 if (pw) 156 user(pw); 157 else 158 current(); 159 done: 160 free(groups); 161 162 return 0; 163 } 164 165 static void 166 pretty(struct passwd *pw) 167 { 168 struct group *gr; 169 u_int eid, rid; 170 char *login; 171 172 if (pw) { 173 (void)printf("uid\t%s\n", pw->pw_name); 174 (void)printf("groups\t"); 175 group(pw, 1); 176 } else { 177 if ((login = getlogin()) == NULL) 178 err(1, "getlogin"); 179 180 pw = getpwuid(rid = getuid()); 181 if (pw == NULL || strcmp(login, pw->pw_name)) 182 (void)printf("login\t%s\n", login); 183 if (pw) 184 (void)printf("uid\t%s\n", pw->pw_name); 185 else 186 (void)printf("uid\t%u\n", rid); 187 188 if ((eid = geteuid()) != rid) { 189 if ((pw = getpwuid(eid)) != NULL) 190 (void)printf("euid\t%s\n", pw->pw_name); 191 else 192 (void)printf("euid\t%u\n", eid); 193 } 194 if ((rid = getgid()) != (eid = getegid())) { 195 if ((gr = getgrgid(rid)) != NULL) 196 (void)printf("rgid\t%s\n", gr->gr_name); 197 else 198 (void)printf("rgid\t%u\n", rid); 199 } 200 (void)printf("groups\t"); 201 group(NULL, 1); 202 } 203 } 204 205 static void 206 current(void) 207 { 208 struct group *gr; 209 struct passwd *pw; 210 int cnt, id, eid, lastid, ngroups; 211 const char *fmt; 212 213 id = getuid(); 214 (void)printf("uid=%u", id); 215 if ((pw = getpwuid(id)) != NULL) 216 (void)printf("(%s)", pw->pw_name); 217 if ((eid = geteuid()) != id) { 218 (void)printf(" euid=%u", eid); 219 if ((pw = getpwuid(eid)) != NULL) 220 (void)printf("(%s)", pw->pw_name); 221 } 222 id = getgid(); 223 (void)printf(" gid=%u", id); 224 if ((gr = getgrgid(id)) != NULL) 225 (void)printf("(%s)", gr->gr_name); 226 if ((eid = getegid()) != id) { 227 (void)printf(" egid=%u", eid); 228 if ((gr = getgrgid(eid)) != NULL) 229 (void)printf("(%s)", gr->gr_name); 230 } 231 if ((ngroups = getgroups(maxgroups, groups)) != 0) { 232 for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups; 233 fmt = ",%u", lastid = id, cnt++) { 234 id = groups[cnt]; 235 if (lastid == id) 236 continue; 237 (void)printf(fmt, id); 238 if ((gr = getgrgid(id)) != NULL) 239 (void)printf("(%s)", gr->gr_name); 240 } 241 } 242 (void)printf("\n"); 243 } 244 245 static void 246 user(struct passwd *pw) 247 { 248 struct group *gr; 249 const char *fmt; 250 int cnt, id, lastid, ngroups; 251 252 id = pw->pw_uid; 253 (void)printf("uid=%u(%s)", id, pw->pw_name); 254 (void)printf(" gid=%lu", (u_long)pw->pw_gid); 255 if ((gr = getgrgid(pw->pw_gid)) != NULL) 256 (void)printf("(%s)", gr->gr_name); 257 ngroups = maxgroups + 1; 258 (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); 259 for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups; 260 fmt=",%u", lastid = id, cnt++) { 261 id = groups[cnt]; 262 if (lastid == id) 263 continue; 264 (void)printf(fmt, id); 265 if ((gr = getgrgid(id)) != NULL) 266 (void)printf("(%s)", gr->gr_name); 267 } 268 (void)printf("\n"); 269 } 270 271 static void 272 group(struct passwd *pw, int nflag) 273 { 274 struct group *gr; 275 int cnt, id, lastid, ngroups; 276 const char *fmt; 277 278 if (pw) { 279 ngroups = maxgroups; 280 (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); 281 } else { 282 groups[0] = getgid(); 283 ngroups = getgroups(maxgroups, groups + 1) + 1; 284 } 285 fmt = nflag ? "%s" : "%u"; 286 for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) { 287 if (lastid == (id = groups[cnt])) 288 continue; 289 if (nflag) { 290 if ((gr = getgrgid(id)) != NULL) 291 (void)printf(fmt, gr->gr_name); 292 else 293 (void)printf(*fmt == ' ' ? " %u" : "%u", 294 id); 295 fmt = " %s"; 296 } else { 297 (void)printf(fmt, id); 298 fmt = " %u"; 299 } 300 lastid = id; 301 } 302 (void)printf("\n"); 303 } 304 305 static struct passwd * 306 who(char *u) 307 { 308 struct passwd *pw; 309 long id; 310 char *ep; 311 312 /* 313 * Translate user argument into a pw pointer. First, try to 314 * get it as specified. If that fails, try it as a number. 315 */ 316 if ((pw = getpwnam(u)) != NULL) 317 return pw; 318 id = strtol(u, &ep, 10); 319 if (*u && !*ep && (pw = getpwuid(id))) 320 return pw; 321 errx(1, "%s: No such user", u); 322 /* NOTREACHED */ 323 return NULL; 324 } 325 326 static void 327 usage(void) 328 { 329 330 if (strcmp(getprogname(), "groups") == 0) { 331 (void)fprintf(stderr, "usage: groups [user]\n"); 332 } else if (strcmp(getprogname(), "whoami") == 0) { 333 (void)fprintf(stderr, "usage: whoami\n"); 334 } else { 335 (void)fprintf(stderr, "usage: id [user]\n"); 336 (void)fprintf(stderr, " id -G [-n] [user]\n"); 337 (void)fprintf(stderr, " id -g [-nr] [user]\n"); 338 (void)fprintf(stderr, " id -p [user]\n"); 339 (void)fprintf(stderr, " id -u [-nr] [user]\n"); 340 } 341 exit(1); 342 } 343