getnetnamadr.c revision 1.19.4.4
1 /* $NetBSD: getnetnamadr.c,v 1.19.4.4 2002/11/14 14:37:17 itojun Exp $ */ 2 3 /* Copyright (c) 1993 Carlos Leandro and Rui Salgueiro 4 * Dep. Matematica Universidade de Coimbra, Portugal, Europe 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 */ 10 /* 11 * Copyright (c) 1983, 1993 12 * The Regents of the University of California. All rights reserved. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 */ 42 43 #include <sys/cdefs.h> 44 #if defined(LIBC_SCCS) && !defined(lint) 45 #if 0 46 static char sccsid[] = "@(#)getnetbyaddr.c 8.1 (Berkeley) 6/4/93"; 47 static char sccsid_[] = "from getnetnamadr.c 1.4 (Coimbra) 93/06/03"; 48 static char rcsid[] = "Id: getnetnamadr.c,v 8.8 1997/06/01 20:34:37 vixie Exp "; 49 #else 50 __RCSID("$NetBSD: getnetnamadr.c,v 1.19.4.4 2002/11/14 14:37:17 itojun Exp $"); 51 #endif 52 #endif /* LIBC_SCCS and not lint */ 53 54 #include "namespace.h" 55 #include <sys/types.h> 56 #include <sys/param.h> 57 #include <sys/socket.h> 58 #include <netinet/in.h> 59 #include <arpa/inet.h> 60 #include <arpa/nameser.h> 61 62 #include <assert.h> 63 #include <ctype.h> 64 #include <errno.h> 65 #include <netdb.h> 66 #include <nsswitch.h> 67 #include <resolv.h> 68 #include <stdio.h> 69 #include <stdlib.h> 70 #include <string.h> 71 72 #ifdef __STDC__ 73 #include <stdarg.h> 74 #else 75 #include <varargs.h> 76 #endif 77 78 #ifdef YP 79 #include <rpc/rpc.h> 80 #include <rpcsvc/yp_prot.h> 81 #include <rpcsvc/ypclnt.h> 82 #endif 83 84 #ifdef __weak_alias 85 __weak_alias(getnetbyaddr,_getnetbyaddr) 86 __weak_alias(getnetbyname,_getnetbyname) 87 #endif 88 89 extern int _net_stayopen; 90 91 #define BYADDR 0 92 #define BYNAME 1 93 #define MAXALIASES 35 94 95 #define MAXPACKET (64*1024) 96 97 typedef union { 98 HEADER hdr; 99 u_char buf[MAXPACKET]; 100 } querybuf; 101 102 typedef union { 103 long al; 104 char ac; 105 } align; 106 107 #ifdef YP 108 static char *__ypdomain; 109 static char *__ypcurrent; 110 static int __ypcurrentlen; 111 #endif 112 113 static struct netent net_entry; 114 static char *net_aliases[MAXALIASES]; 115 116 static struct netent *getnetanswer __P((querybuf *, int, int)); 117 int _files_getnetbyaddr __P((void *, void *, va_list)); 118 int _files_getnetbyname __P((void *, void *, va_list)); 119 int _dns_getnetbyaddr __P((void *, void *, va_list)); 120 int _dns_getnetbyname __P((void *, void *, va_list)); 121 #ifdef YP 122 int _yp_getnetbyaddr __P((void *, void *, va_list)); 123 int _yp_getnetbyname __P((void *, void *, va_list)); 124 struct netent *_ypnetent __P((char *)); 125 #endif 126 127 static struct netent * 128 getnetanswer(answer, anslen, net_i) 129 querybuf *answer; 130 int anslen; 131 int net_i; 132 { 133 HEADER *hp; 134 u_char *cp; 135 int n; 136 u_char *eom; 137 int type, class, ancount, qdcount, haveanswer, i, nchar; 138 char aux1[MAXDNAME], aux2[MAXDNAME], ans[MAXDNAME]; 139 char *in, *st, *pauxt, *bp, **ap; 140 char *paux1 = &aux1[0], *paux2 = &aux2[0], *ep; 141 static char netbuf[PACKETSZ]; 142 143 _DIAGASSERT(answer != NULL); 144 145 /* 146 * find first satisfactory answer 147 * 148 * answer --> +------------+ ( MESSAGE ) 149 * | Header | 150 * +------------+ 151 * | Question | the question for the name server 152 * +------------+ 153 * | Answer | RRs answering the question 154 * +------------+ 155 * | Authority | RRs pointing toward an authority 156 * | Additional | RRs holding additional information 157 * +------------+ 158 */ 159 eom = answer->buf + anslen; 160 hp = &answer->hdr; 161 ancount = ntohs(hp->ancount); /* #/records in the answer section */ 162 qdcount = ntohs(hp->qdcount); /* #/entries in the question section */ 163 bp = netbuf; 164 ep = netbuf + sizeof(netbuf); 165 cp = answer->buf + HFIXEDSZ; 166 if (!qdcount) { 167 if (hp->aa) 168 h_errno = HOST_NOT_FOUND; 169 else 170 h_errno = TRY_AGAIN; 171 return (NULL); 172 } 173 while (qdcount-- > 0) { 174 n = __dn_skipname(cp, eom); 175 if (n < 0 || (cp + n + QFIXEDSZ) > eom) { 176 h_errno = NO_RECOVERY; 177 return(NULL); 178 } 179 cp += n + QFIXEDSZ; 180 } 181 ap = net_aliases; 182 *ap = NULL; 183 net_entry.n_aliases = net_aliases; 184 haveanswer = 0; 185 while (--ancount >= 0 && cp < eom) { 186 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 187 if ((n < 0) || !res_dnok(bp)) 188 break; 189 cp += n; 190 ans[0] = '\0'; 191 (void)strlcpy(ans, bp, sizeof(ans)); 192 GETSHORT(type, cp); 193 GETSHORT(class, cp); 194 cp += INT32SZ; /* TTL */ 195 GETSHORT(n, cp); 196 if (class == C_IN && type == T_PTR) { 197 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 198 if ((n < 0) || !res_hnok(bp)) { 199 cp += n; 200 return (NULL); 201 } 202 cp += n; 203 *ap++ = bp; 204 bp += strlen(bp) + 1; 205 net_entry.n_addrtype = 206 (class == C_IN) ? AF_INET : AF_UNSPEC; 207 haveanswer++; 208 } 209 } 210 if (haveanswer) { 211 *ap = NULL; 212 switch (net_i) { 213 case BYADDR: 214 net_entry.n_name = *net_entry.n_aliases; 215 net_entry.n_net = 0L; 216 break; 217 case BYNAME: 218 ap = net_entry.n_aliases; 219 next_alias: 220 in = *ap++; 221 if (in == NULL) { 222 h_errno = HOST_NOT_FOUND; 223 return (NULL); 224 } 225 net_entry.n_name = ans; 226 aux2[0] = '\0'; 227 for (i = 0; i < 4; i++) { 228 for (st = in, nchar = 0; 229 isdigit((unsigned char)*st); 230 st++, nchar++) 231 ; 232 if (*st != '.' || nchar == 0 || nchar > 3) 233 goto next_alias; 234 if (i != 0) 235 nchar++; 236 (void)strlcpy(paux1, in, (size_t)nchar); 237 paux1[nchar] = '\0'; 238 pauxt = paux2; 239 paux2 = strcat(paux1, paux2); 240 paux1 = pauxt; 241 in = ++st; 242 } 243 net_entry.n_net = inet_network(paux2); 244 break; 245 } 246 if (strcasecmp(in, "IN-ADDR.ARPA") != 0) 247 goto next_alias; 248 net_entry.n_aliases++; 249 return (&net_entry); 250 } 251 h_errno = TRY_AGAIN; 252 return (NULL); 253 } 254 255 /*ARGSUSED*/ 256 int 257 _files_getnetbyaddr(rv, cb_data, ap) 258 void *rv; 259 void *cb_data; 260 va_list ap; 261 { 262 struct netent *p; 263 unsigned long net; 264 int type; 265 266 _DIAGASSERT(rv != NULL); 267 268 net = va_arg(ap, unsigned long); 269 type = va_arg(ap, int); 270 271 setnetent(_net_stayopen); 272 while ((p = getnetent()) != NULL) 273 if (p->n_addrtype == type && p->n_net == net) 274 break; 275 if (!_net_stayopen) 276 endnetent(); 277 *((struct netent **)rv) = p; 278 if (p==NULL) { 279 h_errno = HOST_NOT_FOUND; 280 return NS_NOTFOUND; 281 } 282 return NS_SUCCESS; 283 } 284 285 /*ARGSUSED*/ 286 int 287 _dns_getnetbyaddr(rv, cb_data, ap) 288 void *rv; 289 void *cb_data; 290 va_list ap; 291 { 292 unsigned int netbr[4]; 293 int nn, anslen; 294 querybuf *buf; 295 char qbuf[MAXDNAME]; 296 unsigned long net2; 297 struct netent *np; 298 unsigned long net; 299 int type; 300 301 _DIAGASSERT(rv != NULL); 302 303 net = va_arg(ap, unsigned long); 304 type = va_arg(ap, int); 305 306 if (type != AF_INET) 307 return NS_UNAVAIL; 308 309 for (nn = 4, net2 = net; net2; net2 >>= 8) 310 netbr[--nn] = (unsigned int)(net2 & 0xff); 311 switch (nn) { 312 default: 313 return NS_UNAVAIL; 314 case 3: /* Class A */ 315 snprintf(qbuf, sizeof(qbuf), "0.0.0.%u.in-addr.arpa", netbr[3]); 316 break; 317 case 2: /* Class B */ 318 snprintf(qbuf, sizeof(qbuf), "0.0.%u.%u.in-addr.arpa", 319 netbr[3], netbr[2]); 320 break; 321 case 1: /* Class C */ 322 snprintf(qbuf, sizeof(qbuf), "0.%u.%u.%u.in-addr.arpa", 323 netbr[3], netbr[2], netbr[1]); 324 break; 325 case 0: /* Class D - E */ 326 snprintf(qbuf, sizeof(qbuf), "%u.%u.%u.%u.in-addr.arpa", 327 netbr[3], netbr[2], netbr[1], netbr[0]); 328 break; 329 } 330 buf = malloc(sizeof(*buf)); 331 if (buf == NULL) { 332 h_errno = NETDB_INTERNAL; 333 return NS_NOTFOUND; 334 } 335 anslen = res_query(qbuf, C_IN, T_PTR, buf->buf, sizeof(buf->buf)); 336 if (anslen < 0) { 337 free(buf); 338 #ifdef DEBUG 339 if (_res.options & RES_DEBUG) 340 printf("res_query failed\n"); 341 #endif 342 return NS_NOTFOUND; 343 } 344 np = getnetanswer(buf, anslen, BYADDR); 345 free(buf); 346 if (np) { 347 /* maybe net should be unsigned? */ 348 unsigned long u_net = net; 349 350 /* Strip trailing zeros */ 351 while ((u_net & 0xff) == 0 && u_net != 0) 352 u_net >>= 8; 353 np->n_net = u_net; 354 } 355 *((struct netent **)rv) = np; 356 if (np == NULL) { 357 h_errno = HOST_NOT_FOUND; 358 return NS_NOTFOUND; 359 } 360 return NS_SUCCESS; 361 } 362 363 364 struct netent * 365 getnetbyaddr(net, net_type) 366 u_long net; 367 int net_type; 368 { 369 struct netent *np; 370 static const ns_dtab dtab[] = { 371 NS_FILES_CB(_files_getnetbyaddr, NULL) 372 { NSSRC_DNS, _dns_getnetbyaddr, NULL }, /* force -DHESIOD */ 373 NS_NIS_CB(_yp_getnetbyaddr, NULL) 374 { 0 } 375 }; 376 377 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 378 h_errno = NETDB_INTERNAL; 379 return (NULL); 380 } 381 382 np = NULL; 383 h_errno = NETDB_INTERNAL; 384 if (nsdispatch(&np, dtab, NSDB_NETWORKS, "getnetbyaddr", __nsdefaultsrc, 385 net, net_type) != NS_SUCCESS) 386 return (NULL); 387 h_errno = NETDB_SUCCESS; 388 return (np); 389 } 390 391 /*ARGSUSED*/ 392 int 393 _files_getnetbyname(rv, cb_data, ap) 394 void *rv; 395 void *cb_data; 396 va_list ap; 397 { 398 struct netent *p; 399 char **cp; 400 const char *name; 401 402 _DIAGASSERT(rv != NULL); 403 404 name = va_arg(ap, const char *); 405 setnetent(_net_stayopen); 406 while ((p = getnetent()) != NULL) { 407 if (strcasecmp(p->n_name, name) == 0) 408 break; 409 for (cp = p->n_aliases; *cp != 0; cp++) 410 if (strcasecmp(*cp, name) == 0) 411 goto found; 412 } 413 found: 414 if (!_net_stayopen) 415 endnetent(); 416 *((struct netent **)rv) = p; 417 if (p==NULL) { 418 h_errno = HOST_NOT_FOUND; 419 return NS_NOTFOUND; 420 } 421 return NS_SUCCESS; 422 } 423 424 /*ARGSUSED*/ 425 int 426 _dns_getnetbyname(rv, cb_data, ap) 427 void *rv; 428 void *cb_data; 429 va_list ap; 430 { 431 int anslen; 432 querybuf *buf; 433 char qbuf[MAXDNAME]; 434 struct netent *np; 435 const char *net; 436 437 _DIAGASSERT(rv != NULL); 438 439 net = va_arg(ap, const char *); 440 strlcpy(&qbuf[0], net, sizeof(qbuf)); 441 buf = malloc(sizeof(*buf)); 442 if (buf == NULL) { 443 h_errno = NETDB_INTERNAL; 444 return NS_NOTFOUND; 445 } 446 anslen = res_search(qbuf, C_IN, T_PTR, buf->buf, sizeof(buf->buf)); 447 if (anslen < 0) { 448 free(buf); 449 #ifdef DEBUG 450 if (_res.options & RES_DEBUG) 451 printf("res_search failed\n"); 452 #endif 453 return NS_NOTFOUND; 454 } 455 np = getnetanswer(buf, anslen, BYNAME); 456 free(buf); 457 *((struct netent **)rv) = np; 458 if (np == NULL) { 459 h_errno = HOST_NOT_FOUND; 460 return NS_NOTFOUND; 461 } 462 return NS_SUCCESS; 463 } 464 465 struct netent * 466 getnetbyname(net) 467 const char *net; 468 { 469 struct netent *np; 470 static const ns_dtab dtab[] = { 471 NS_FILES_CB(_files_getnetbyname, NULL) 472 { NSSRC_DNS, _dns_getnetbyname, NULL }, /* force -DHESIOD */ 473 NS_NIS_CB(_yp_getnetbyname, NULL) 474 { 0 } 475 }; 476 477 _DIAGASSERT(net != NULL); 478 479 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 480 h_errno = NETDB_INTERNAL; 481 return (NULL); 482 } 483 484 np = NULL; 485 h_errno = NETDB_INTERNAL; 486 if (nsdispatch(&np, dtab, NSDB_NETWORKS, "getnetbyname", __nsdefaultsrc, 487 net) != NS_SUCCESS) 488 return (NULL); 489 h_errno = NETDB_SUCCESS; 490 return (np); 491 } 492 493 #ifdef YP 494 /*ARGSUSED*/ 495 int 496 _yp_getnetbyaddr(rv, cb_data, ap) 497 void *rv; 498 void *cb_data; 499 va_list ap; 500 { 501 struct netent *np; 502 char qbuf[MAXDNAME]; 503 unsigned int netbr[4]; 504 unsigned long net, net2; 505 int type, r; 506 507 _DIAGASSERT(rv != NULL); 508 509 net = va_arg(ap, unsigned long); 510 type = va_arg(ap, int); 511 512 if (type != AF_INET) 513 return NS_UNAVAIL; 514 515 if (!__ypdomain) { 516 if (_yp_check(&__ypdomain) == 0) 517 return NS_UNAVAIL; 518 } 519 np = NULL; 520 if (__ypcurrent) 521 free(__ypcurrent); 522 __ypcurrent = NULL; 523 for (r = 4, net2 = net; net2; net2 >>= 8) 524 netbr[--r] = (unsigned int)(net2 & 0xff); 525 switch (r) { 526 default: 527 return NS_UNAVAIL; 528 case 3: /* Class A */ 529 snprintf(qbuf, sizeof(qbuf), "%u", netbr[0]); 530 break; 531 case 2: /* Class B */ 532 snprintf(qbuf, sizeof(qbuf), "%u.%u", netbr[0], netbr[1]); 533 break; 534 case 1: /* Class C */ 535 snprintf(qbuf, sizeof(qbuf), "%u.%u.%u", netbr[0], netbr[1], 536 netbr[2]); 537 break; 538 case 0: /* Class D - E */ 539 snprintf(qbuf, sizeof(qbuf), "%u.%u.%u.%u", netbr[0], netbr[1], 540 netbr[2], netbr[3]); 541 break; 542 } 543 r = yp_match(__ypdomain, "networks.byaddr", qbuf, (int)strlen(qbuf), 544 &__ypcurrent, &__ypcurrentlen); 545 if (r == 0) 546 np = _ypnetent(__ypcurrent); 547 548 *((struct netent **)rv) = np; 549 if (np == NULL) { 550 h_errno = HOST_NOT_FOUND; 551 return NS_NOTFOUND; 552 } 553 return NS_SUCCESS; 554 555 } 556 557 int 558 /*ARGSUSED*/ 559 _yp_getnetbyname(rv, cb_data, ap) 560 void *rv; 561 void *cb_data; 562 va_list ap; 563 { 564 struct netent *np; 565 const char *name; 566 int r; 567 568 _DIAGASSERT(rv != NULL); 569 570 name = va_arg(ap, const char *); 571 572 if (!__ypdomain) { 573 if (_yp_check(&__ypdomain) == 0) 574 return NS_UNAVAIL; 575 } 576 np = NULL; 577 if (__ypcurrent) 578 free(__ypcurrent); 579 __ypcurrent = NULL; 580 r = yp_match(__ypdomain, "networks.byname", name, (int)strlen(name), 581 &__ypcurrent, &__ypcurrentlen); 582 if (r == 0) 583 np = _ypnetent(__ypcurrent); 584 585 *((struct netent **)rv) = np; 586 if (np == NULL) { 587 h_errno = HOST_NOT_FOUND; 588 return NS_NOTFOUND; 589 } 590 return NS_SUCCESS; 591 } 592 593 struct netent * 594 _ypnetent(line) 595 char *line; 596 { 597 char *cp, *p, **q; 598 599 _DIAGASSERT(line != NULL); 600 601 net_entry.n_name = line; 602 cp = strpbrk(line, " \t"); 603 if (cp == NULL) 604 return (NULL); 605 *cp++ = '\0'; 606 while (*cp == ' ' || *cp == '\t') 607 cp++; 608 p = strpbrk(cp, " \t"); 609 if (p != NULL) 610 *p++ = '\0'; 611 net_entry.n_net = inet_network(cp); 612 net_entry.n_addrtype = AF_INET; 613 q = net_entry.n_aliases = net_aliases; 614 if (p != NULL) { 615 cp = p; 616 while (cp && *cp) { 617 if (*cp == ' ' || *cp == '\t') { 618 cp++; 619 continue; 620 } 621 if (q < &net_aliases[MAXALIASES - 1]) 622 *q++ = cp; 623 cp = strpbrk(cp, " \t"); 624 if (cp != NULL) 625 *cp++ = '\0'; 626 } 627 } 628 *q = NULL; 629 630 return (&net_entry); 631 } 632 #endif 633
Indexes created Tue Sep 30 17:09:57 GMT 2025