1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char copyright[] = 10 "@(#) Copyright (c) 1991, 1993\n\ 11 The Regents of the University of California. All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)id.c 8.3 (Berkeley) 04/28/95"; 16 #endif /* not lint */ 17 18 #include <sys/param.h> 19 20 #include <errno.h> 21 #include <grp.h> 22 #include <pwd.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <unistd.h> 27 28 void current __P((void)); 29 void err __P((const char *, ...)); 30 void pretty __P((struct passwd *)); 31 void group __P((struct passwd *, int)); 32 void usage __P((void)); 33 void user __P((struct passwd *)); 34 struct passwd * 35 who __P((char *)); 36 37 int 38 main(argc, argv) 39 int argc; 40 char *argv[]; 41 { 42 struct group *gr; 43 struct passwd *pw; 44 int Gflag, ch, gflag, id, nflag, pflag, rflag, uflag; 45 46 Gflag = gflag = nflag = pflag = rflag = uflag = 0; 47 while ((ch = getopt(argc, argv, "Ggnpru")) != EOF) 48 switch(ch) { 49 case 'G': 50 Gflag = 1; 51 break; 52 case 'g': 53 gflag = 1; 54 break; 55 case 'n': 56 nflag = 1; 57 break; 58 case 'p': 59 pflag = 1; 60 break; 61 case 'r': 62 rflag = 1; 63 break; 64 case 'u': 65 uflag = 1; 66 break; 67 case '?': 68 default: 69 usage(); 70 } 71 argc -= optind; 72 argv += optind; 73 74 switch(Gflag + gflag + pflag + uflag) { 75 case 1: 76 break; 77 case 0: 78 if (!nflag && !rflag) 79 break; 80 /* FALLTHROUGH */ 81 default: 82 usage(); 83 } 84 85 pw = *argv ? who(*argv) : NULL; 86 87 if (gflag) { 88 id = pw ? pw->pw_gid : rflag ? getgid() : getegid(); 89 if (nflag && (gr = getgrgid(id))) 90 (void)printf("%s\n", gr->gr_name); 91 else 92 (void)printf("%u\n", id); 93 exit(0); 94 } 95 96 if (uflag) { 97 id = pw ? pw->pw_uid : rflag ? getuid() : geteuid(); 98 if (nflag && (pw = getpwuid(id))) 99 (void)printf("%s\n", pw->pw_name); 100 else 101 (void)printf("%u\n", id); 102 exit(0); 103 } 104 105 if (Gflag) { 106 group(pw, nflag); 107 exit(0); 108 } 109 110 if (pflag) { 111 pretty(pw); 112 exit(0); 113 } 114 115 if (pw) 116 user(pw); 117 else 118 current(); 119 exit(0); 120 } 121 122 void 123 pretty(pw) 124 struct passwd *pw; 125 { 126 struct group *gr; 127 u_int eid, rid; 128 char *login; 129 130 if (pw) { 131 (void)printf("uid\t%s\n", pw->pw_name); 132 (void)printf("groups\t"); 133 group(pw, 1); 134 } else { 135 if ((login = getlogin()) == NULL) 136 err("getlogin: %s", strerror(errno)); 137 138 pw = getpwuid(rid = getuid()); 139 if (pw == NULL || strcmp(login, pw->pw_name)) 140 (void)printf("login\t%s\n", login); 141 if (pw) 142 (void)printf("uid\t%s\n", pw->pw_name); 143 else 144 (void)printf("uid\t%u\n", rid); 145 146 if ((eid = geteuid()) != rid) 147 if (pw = getpwuid(eid)) 148 (void)printf("euid\t%s", pw->pw_name); 149 else 150 (void)printf("euid\t%u", eid); 151 if ((rid = getgid()) != (eid = getegid())) 152 if (gr = getgrgid(rid)) 153 (void)printf("rgid\t%s\n", gr->gr_name); 154 else 155 (void)printf("rgid\t%u\n", rid); 156 (void)printf("groups\t"); 157 group(NULL, 1); 158 } 159 } 160 161 void 162 current() 163 { 164 struct group *gr; 165 struct passwd *pw; 166 int cnt, id, eid, lastid, ngroups; 167 gid_t groups[NGROUPS]; 168 char *fmt; 169 170 id = getuid(); 171 (void)printf("uid=%u", id); 172 if (pw = getpwuid(id)) 173 (void)printf("(%s)", pw->pw_name); 174 if ((eid = geteuid()) != id) { 175 (void)printf(" euid=%u", eid); 176 if (pw = getpwuid(eid)) 177 (void)printf("(%s)", pw->pw_name); 178 } 179 id = getgid(); 180 (void)printf(" gid=%u", id); 181 if (gr = getgrgid(id)) 182 (void)printf("(%s)", gr->gr_name); 183 if ((eid = getegid()) != id) { 184 (void)printf(" egid=%u", eid); 185 if (gr = getgrgid(eid)) 186 (void)printf("(%s)", gr->gr_name); 187 } 188 if (ngroups = getgroups(NGROUPS, groups)) { 189 for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups; 190 fmt = ", %u", lastid = id) { 191 id = groups[cnt++]; 192 if (lastid == id) 193 continue; 194 (void)printf(fmt, id); 195 if (gr = getgrgid(id)) 196 (void)printf("(%s)", gr->gr_name); 197 } 198 } 199 (void)printf("\n"); 200 } 201 202 void 203 user(pw) 204 register struct passwd *pw; 205 { 206 register struct group *gr; 207 register char *fmt, **p; 208 int cnt, id, lastid, ngroups, groups[NGROUPS + 1]; 209 210 id = pw->pw_uid; 211 (void)printf("uid=%u(%s)", id, pw->pw_name); 212 (void)printf(" gid=%u", pw->pw_gid); 213 if (gr = getgrgid(pw->pw_gid)) 214 (void)printf("(%s)", gr->gr_name); 215 ngroups = NGROUPS + 1; 216 (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); 217 fmt = " groups=%u"; 218 for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) { 219 if (lastid == (id = groups[cnt])) 220 continue; 221 (void)printf(fmt, id); 222 fmt = " %u"; 223 if (gr = getgrgid(id)) 224 (void)printf("(%s)", gr->gr_name); 225 lastid = id; 226 } 227 (void)printf("\n"); 228 } 229 230 void 231 group(pw, nflag) 232 struct passwd *pw; 233 int nflag; 234 { 235 struct group *gr; 236 int cnt, id, lastid, ngroups; 237 gid_t groups[NGROUPS + 1]; 238 char *fmt; 239 240 if (pw) { 241 ngroups = NGROUPS + 1; 242 (void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups); 243 } else { 244 groups[0] = getgid(); 245 ngroups = getgroups(NGROUPS, groups + 1) + 1; 246 } 247 fmt = nflag ? "%s" : "%u"; 248 for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) { 249 if (lastid == (id = groups[cnt])) 250 continue; 251 if (nflag) { 252 if (gr = getgrgid(id)) 253 (void)printf(fmt, gr->gr_name); 254 else 255 (void)printf(*fmt == ' ' ? " %u" : "%u", 256 id); 257 fmt = " %s"; 258 } else { 259 (void)printf(fmt, id); 260 fmt = " %u"; 261 } 262 lastid = id; 263 } 264 (void)printf("\n"); 265 } 266 267 struct passwd * 268 who(u) 269 char *u; 270 { 271 struct passwd *pw; 272 long id; 273 char *ep; 274 275 /* 276 * Translate user argument into a pw pointer. First, try to 277 * get it as specified. If that fails, try it as a number. 278 */ 279 if (pw = getpwnam(u)) 280 return(pw); 281 id = strtol(u, &ep, 10); 282 if (*u && !*ep && (pw = getpwuid(id))) 283 return(pw); 284 err("%s: No such user", u); 285 /* NOTREACHED */ 286 } 287 288 #if __STDC__ 289 #include <stdarg.h> 290 #else 291 #include <varargs.h> 292 #endif 293 294 void 295 #if __STDC__ 296 err(const char *fmt, ...) 297 #else 298 err(fmt, va_alist) 299 char *fmt; 300 va_dcl 301 #endif 302 { 303 va_list ap; 304 #if __STDC__ 305 va_start(ap, fmt); 306 #else 307 va_start(ap); 308 #endif 309 (void)fprintf(stderr, "id: "); 310 (void)vfprintf(stderr, fmt, ap); 311 va_end(ap); 312 (void)fprintf(stderr, "\n"); 313 exit(1); 314 /* NOTREACHED */ 315 } 316 317 void 318 usage() 319 { 320 (void)fprintf(stderr, "usage: id [user]\n"); 321 (void)fprintf(stderr, " id -G [-n] [user]\n"); 322 (void)fprintf(stderr, " id -g [-nr] [user]\n"); 323 (void)fprintf(stderr, " id -u [-nr] [user]\n"); 324 exit(1); 325 } 326