getpwent.c revision 1.11
1 /* 2 * Copyright (c) 1988 The Regents of the University of California. 3 * 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 #if defined(LIBC_SCCS) && !defined(lint) 35 /*static char *sccsid = "from: @(#)getpwent.c 5.21 (Berkeley) 3/14/91";*/ 36 static char *rcsid = "$Id: getpwent.c,v 1.11 1994/03/09 10:10:29 deraadt Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <sys/param.h> 40 #include <fcntl.h> 41 #include <db.h> 42 #include <syslog.h> 43 #include <pwd.h> 44 #include <utmp.h> 45 #include <errno.h> 46 #include <unistd.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <limits.h> 50 #ifdef YP 51 #include <stdio.h> 52 #include <rpc/rpc.h> 53 #include <rpcsvc/yp_prot.h> 54 #include <rpcsvc/ypclnt.h> 55 #endif 56 57 static struct passwd _pw_passwd; /* password structure */ 58 static DB *_pw_db; /* password database */ 59 static int _pw_keynum; /* key counter */ 60 static int _pw_stayopen; /* keep fd's open */ 61 static int __hashpw(), __initdb(); 62 63 #ifdef YP 64 static char *__ypcurrent, *__ypdomain; 65 static int __ypcurrentlen, __ypmode=0; 66 static char line[1024]; 67 68 static int 69 __ypparse(pw, s) 70 struct passwd *pw; 71 char *s; 72 { 73 char *bp, *cp; 74 75 bp = s; 76 pw->pw_name = strsep(&bp, ":\n"); 77 pw->pw_passwd = strsep(&bp, ":\n"); 78 if (!(cp = strsep(&bp, ":\n"))) 79 return 1; 80 pw->pw_uid = atoi(cp); 81 if (!(cp = strsep(&bp, ":\n"))) 82 return 0; 83 pw->pw_gid = atoi(cp); 84 pw->pw_change = 0; 85 pw->pw_class = ""; 86 pw->pw_gecos = strsep(&bp, ":\n"); 87 pw->pw_dir = strsep(&bp, ":\n"); 88 pw->pw_shell = strsep(&bp, ":\n"); 89 pw->pw_expire = 0; 90 return 0; 91 } 92 #endif 93 94 struct passwd * 95 getpwent() 96 { 97 DBT key; 98 char bf[sizeof(_pw_keynum) + 1]; 99 #ifdef YP 100 char *bp, *cp; 101 #endif 102 103 if (!_pw_db && !__initdb()) 104 return((struct passwd *)NULL); 105 106 #ifdef YP 107 again: 108 if(__ypmode) { 109 char *key, *data; 110 int keylen, datalen; 111 int r; 112 113 if(!__ypdomain) { 114 if( _yp_check(&__ypdomain) == 0) { 115 __ypmode = 0; 116 goto again; 117 } 118 } 119 if(__ypcurrent) { 120 r = yp_next(__ypdomain, "passwd.byname", 121 __ypcurrent, __ypcurrentlen, 122 &key, &keylen, &data, &datalen); 123 free(__ypcurrent); 124 __ypcurrent = NULL; 125 /*printf("yp_next %d\n", r);*/ 126 switch(r) { 127 case 0: 128 break; 129 default: 130 __ypcurrent = NULL; 131 __ypmode = 0; 132 free(data); 133 data = NULL; 134 goto again; 135 } 136 __ypcurrent = key; 137 __ypcurrentlen = keylen; 138 bcopy(data, line, datalen); 139 free(data); 140 data = NULL; 141 } else { 142 r = yp_first(__ypdomain, "passwd.byname", 143 &__ypcurrent, &__ypcurrentlen, 144 &data, &datalen); 145 /*printf("yp_first %d\n", r);*/ 146 switch(r) { 147 case 0: 148 break; 149 default: 150 __ypmode = 0; 151 free(data); 152 goto again; 153 } 154 bcopy(data, line, datalen); 155 free(data); 156 data = NULL; 157 } 158 line[datalen] = '\0'; 159 /*printf("line = %s\n", line);*/ 160 bp = line; 161 goto parse; 162 } 163 #endif 164 165 ++_pw_keynum; 166 bf[0] = _PW_KEYBYNUM; 167 bcopy((char *)&_pw_keynum, bf + 1, sizeof(_pw_keynum)); 168 key.data = (u_char *)bf; 169 key.size = sizeof(_pw_keynum) + 1; 170 if(__hashpw(&key)) { 171 #ifdef YP 172 if(strcmp(_pw_passwd.pw_name, "+") == 0) { 173 __ypmode = 1; 174 goto again; 175 } 176 #endif 177 return &_pw_passwd; 178 } 179 return (struct passwd *)NULL; 180 181 #ifdef YP 182 parse: 183 _pw_passwd.pw_name = strsep(&bp, ":\n"); 184 _pw_passwd.pw_passwd = strsep(&bp, ":\n"); 185 if (!(cp = strsep(&bp, ":\n"))) 186 goto again; 187 _pw_passwd.pw_uid = atoi(cp); 188 if (!(cp = strsep(&bp, ":\n"))) 189 goto again; 190 _pw_passwd.pw_gid = atoi(cp); 191 _pw_passwd.pw_change = 0; 192 _pw_passwd.pw_class = ""; 193 _pw_passwd.pw_gecos = strsep(&bp, ":\n"); 194 _pw_passwd.pw_dir = strsep(&bp, ":\n"); 195 _pw_passwd.pw_shell = strsep(&bp, ":\n"); 196 _pw_passwd.pw_expire = 0; 197 return &_pw_passwd; 198 #endif 199 } 200 201 struct passwd * 202 getpwnam(name) 203 const char *name; 204 { 205 DBT key; 206 int len, rval; 207 char bf[UT_NAMESIZE + 1]; 208 209 if (!_pw_db && !__initdb()) 210 return((struct passwd *)NULL); 211 212 #ifdef YP 213 bf[0] = _PW_KEYBYNAME; 214 len = strlen("+"); 215 bcopy("+", bf + 1, MIN(len, UT_NAMESIZE)); 216 key.data = (u_char *)bf; 217 key.size = len + 1; 218 219 /* 220 * If there is a user called "+", then YP is active. In that 221 * case we must sequence through the passwd file in sequence. 222 */ 223 if ( __hashpw(&key)) { 224 int r; 225 226 for(_pw_keynum=1; _pw_keynum; _pw_keynum++) { 227 bf[0] = _PW_KEYBYNUM; 228 bcopy((char *)&_pw_keynum, bf + 1, sizeof(_pw_keynum)); 229 key.data = (u_char *)bf; 230 key.size = sizeof(_pw_keynum) + 1; 231 if(__hashpw(&key) == 0) 232 break; 233 if(strcmp(_pw_passwd.pw_name, "+") == 0) { 234 if(!__ypdomain) { 235 if(_yp_check(&__ypdomain) == 0) { 236 continue; 237 } 238 } 239 if(__ypcurrent) { 240 free(__ypcurrent); 241 __ypcurrent = NULL; 242 } 243 r = yp_match(__ypdomain, "passwd.byname", 244 name, strlen(name), 245 &__ypcurrent, &__ypcurrentlen); 246 switch(r) { 247 case 0: 248 break; 249 default: 250 free(__ypcurrent); 251 __ypcurrent = NULL; 252 continue; 253 } 254 bcopy(__ypcurrent, line, __ypcurrentlen); 255 line[__ypcurrentlen] = '\0'; 256 if(__ypparse(&_pw_passwd, line)) 257 continue; 258 } 259 if( strcmp(_pw_passwd.pw_name, name) == 0) { 260 if (!_pw_stayopen) { 261 (void)(_pw_db->close)(_pw_db); 262 _pw_db = (DB *)NULL; 263 } 264 return &_pw_passwd; 265 } 266 continue; 267 } 268 if (!_pw_stayopen) { 269 (void)(_pw_db->close)(_pw_db); 270 _pw_db = (DB *)NULL; 271 } 272 return (struct passwd *)NULL; 273 } 274 #endif /* YP */ 275 276 bf[0] = _PW_KEYBYNAME; 277 len = strlen(name); 278 bcopy(name, bf + 1, MIN(len, UT_NAMESIZE)); 279 key.data = (u_char *)bf; 280 key.size = len + 1; 281 rval = __hashpw(&key); 282 283 if (!_pw_stayopen) { 284 (void)(_pw_db->close)(_pw_db); 285 _pw_db = (DB *)NULL; 286 } 287 return(rval ? &_pw_passwd : (struct passwd *)NULL); 288 } 289 290 struct passwd * 291 #ifdef __STDC__ 292 getpwuid(uid_t uid) 293 #else 294 getpwuid(uid) 295 int uid; 296 #endif 297 { 298 DBT key; 299 char bf[sizeof(_pw_keynum) + 1]; 300 int keyuid, rval, len; 301 302 if (!_pw_db && !__initdb()) 303 return((struct passwd *)NULL); 304 305 #ifdef YP 306 bf[0] = _PW_KEYBYNAME; 307 len = strlen("+"); 308 bcopy("+", bf + 1, MIN(len, UT_NAMESIZE)); 309 key.data = (u_char *)bf; 310 key.size = len + 1; 311 312 /* 313 * If there is a user called "+", then YP is active. In that 314 * case we must sequence through the passwd file in sequence. 315 */ 316 if ( __hashpw(&key)) { 317 char uidbuf[20]; 318 int r; 319 320 for(_pw_keynum=1; _pw_keynum; _pw_keynum++) { 321 bf[0] = _PW_KEYBYNUM; 322 bcopy((char *)&_pw_keynum, bf + 1, sizeof(_pw_keynum)); 323 key.data = (u_char *)bf; 324 key.size = sizeof(_pw_keynum) + 1; 325 if(__hashpw(&key) == 0) 326 break; 327 if(strcmp(_pw_passwd.pw_name, "+") == 0) { 328 if(!__ypdomain) { 329 if(_yp_check(&__ypdomain) == 0) { 330 continue; 331 } 332 } 333 if(__ypcurrent) { 334 free(__ypcurrent); 335 __ypcurrent = NULL; 336 } 337 sprintf(uidbuf, "%d", uid); 338 r = yp_match(__ypdomain, "passwd.byuid", 339 uidbuf, strlen(uidbuf), 340 &__ypcurrent, &__ypcurrentlen); 341 switch(r) { 342 case 0: 343 break; 344 default: 345 free(__ypcurrent); 346 __ypcurrent = NULL; 347 continue; 348 } 349 bcopy(__ypcurrent, line, __ypcurrentlen); 350 line[__ypcurrentlen] = '\0'; 351 if(__ypparse(&_pw_passwd, line)) 352 continue; 353 } 354 if( _pw_passwd.pw_uid == uid) { 355 if (!_pw_stayopen) { 356 (void)(_pw_db->close)(_pw_db); 357 _pw_db = (DB *)NULL; 358 } 359 return &_pw_passwd; 360 } 361 continue; 362 } 363 if (!_pw_stayopen) { 364 (void)(_pw_db->close)(_pw_db); 365 _pw_db = (DB *)NULL; 366 } 367 return (struct passwd *)NULL; 368 } 369 #endif /* YP */ 370 371 bf[0] = _PW_KEYBYUID; 372 keyuid = uid; 373 bcopy(&keyuid, bf + 1, sizeof(keyuid)); 374 key.data = (u_char *)bf; 375 key.size = sizeof(keyuid) + 1; 376 rval = __hashpw(&key); 377 378 if (!_pw_stayopen) { 379 (void)(_pw_db->close)(_pw_db); 380 _pw_db = (DB *)NULL; 381 } 382 return(rval ? &_pw_passwd : (struct passwd *)NULL); 383 } 384 385 int 386 setpassent(stayopen) 387 int stayopen; 388 { 389 _pw_keynum = 0; 390 _pw_stayopen = stayopen; 391 #ifdef YP 392 __ypmode = 0; 393 if(__ypcurrent) 394 free(__ypcurrent); 395 __ypcurrent = NULL; 396 #endif 397 return(1); 398 } 399 400 void 401 setpwent() 402 { 403 (void) setpassent(0); 404 } 405 406 void 407 endpwent() 408 { 409 _pw_keynum = 0; 410 if (_pw_db) { 411 (void)(_pw_db->close)(_pw_db); 412 _pw_db = (DB *)NULL; 413 } 414 #ifdef YP 415 __ypmode = 0; 416 if(__ypcurrent) 417 free(__ypcurrent); 418 __ypcurrent = NULL; 419 #endif 420 } 421 422 static int 423 __initdb() 424 { 425 static int warned; 426 char *p; 427 428 p = (geteuid()) ? _PATH_MP_DB : _PATH_SMP_DB; 429 _pw_db = dbopen(p, O_RDONLY, 0, DB_HASH, NULL); 430 if (_pw_db) 431 return(1); 432 if (!warned) 433 syslog(LOG_ERR, "%s: %m", p); 434 warned = 1; 435 return(0); 436 } 437 438 static int 439 __hashpw(key) 440 DBT *key; 441 { 442 register char *p, *t; 443 static u_int max; 444 static char *line; 445 DBT data; 446 447 if ((_pw_db->get)(_pw_db, key, &data, 0)) 448 return(0); 449 p = (char *)data.data; 450 if (data.size > max && !(line = realloc(line, max += 1024))) 451 return(0); 452 453 t = line; 454 #define EXPAND(e) e = t; while (*t++ = *p++); 455 EXPAND(_pw_passwd.pw_name); 456 EXPAND(_pw_passwd.pw_passwd); 457 bcopy(p, (char *)&_pw_passwd.pw_uid, sizeof(int)); 458 p += sizeof(int); 459 bcopy(p, (char *)&_pw_passwd.pw_gid, sizeof(int)); 460 p += sizeof(int); 461 bcopy(p, (char *)&_pw_passwd.pw_change, sizeof(time_t)); 462 p += sizeof(time_t); 463 EXPAND(_pw_passwd.pw_class); 464 EXPAND(_pw_passwd.pw_gecos); 465 EXPAND(_pw_passwd.pw_dir); 466 EXPAND(_pw_passwd.pw_shell); 467 bcopy(p, (char *)&_pw_passwd.pw_expire, sizeof(time_t)); 468 p += sizeof(time_t); 469 return(1); 470 } 471
Indexes created Tue Sep 23 21:09:50 GMT 2025