getnetnamadr.c revision 1.20.4.2
1 /* $NetBSD: getnetnamadr.c,v 1.20.4.2 2002/08/17 15:45:39 lukem 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 1.20.4.2 2002/08/17 15:45:39 lukem 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 #if PACKETSZ > 1024 96 #define MAXPACKET PACKETSZ 97 #else 98 #define MAXPACKET 1024 99 #endif 100 101 typedef union { 102 HEADER hdr; 103 u_char buf[MAXPACKET]; 104 } querybuf; 105 106 typedef union { 107 long al; 108 char ac; 109 } align; 110 111 #ifdef YP 112 static char *__ypdomain; 113 static char *__ypcurrent; 114 static int __ypcurrentlen; 115 #endif 116 117 static struct netent net_entry; 118 static char *net_aliases[MAXALIASES]; 119 120 static struct netent *getnetanswer __P((querybuf *, int, int)); 121 int _files_getnetbyaddr __P((void *, void *, va_list)); 122 int _files_getnetbyname __P((void *, void *, va_list)); 123 int _dns_getnetbyaddr __P((void *, void *, va_list)); 124 int _dns_getnetbyname __P((void *, void *, va_list)); 125 #ifdef YP 126 int _yp_getnetbyaddr __P((void *, void *, va_list)); 127 int _yp_getnetbyname __P((void *, void *, va_list)); 128 struct netent *_ypnetent __P((char *)); 129 #endif 130 131 static struct netent * 132 getnetanswer(answer, anslen, net_i) 133 querybuf *answer; 134 int anslen; 135 int net_i; 136 { 137 HEADER *hp; 138 u_char *cp; 139 int n; 140 u_char *eom; 141 int type, class, ancount, qdcount, haveanswer, i, nchar; 142 char aux1[30], aux2[30], ans[30], *in, *st, *pauxt, *bp, **ap, 143 *paux1 = &aux1[0], *paux2 = &aux2[0], flag = 0, *ep; 144 static char netbuf[PACKETSZ]; 145 146 _DIAGASSERT(answer != NULL); 147 148 /* 149 * find first satisfactory answer 150 * 151 * answer --> +------------+ ( MESSAGE ) 152 * | Header | 153 * +------------+ 154 * | Question | the question for the name server 155 * +------------+ 156 * | Answer | RRs answering the question 157 * +------------+ 158 * | Authority | RRs pointing toward an authority 159 * | Additional | RRs holding additional information 160 * +------------+ 161 */ 162 eom = answer->buf + anslen; 163 hp = &answer->hdr; 164 ancount = ntohs(hp->ancount); /* #/records in the answer section */ 165 qdcount = ntohs(hp->qdcount); /* #/entries in the question section */ 166 bp = netbuf; 167 ep = netbuf + sizeof(netbuf); 168 cp = answer->buf + HFIXEDSZ; 169 if (!qdcount) { 170 if (hp->aa) 171 h_errno = HOST_NOT_FOUND; 172 else 173 h_errno = TRY_AGAIN; 174 return (NULL); 175 } 176 while (qdcount-- > 0) 177 cp += __dn_skipname(cp, eom) + QFIXEDSZ; 178 ap = net_aliases; 179 *ap = NULL; 180 net_entry.n_aliases = net_aliases; 181 haveanswer = 0; 182 while (--ancount >= 0 && cp < eom) { 183 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 184 if ((n < 0) || !res_dnok(bp)) 185 break; 186 cp += n; 187 ans[0] = '\0'; 188 (void)strcpy(&ans[0], bp); 189 GETSHORT(type, cp); 190 GETSHORT(class, cp); 191 cp += INT32SZ; /* TTL */ 192 GETSHORT(n, cp); 193 if (class == C_IN && type == T_PTR) { 194 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 195 if ((n < 0) || !res_hnok(bp)) { 196 cp += n; 197 return (NULL); 198 } 199 cp += n; 200 *ap++ = bp; 201 bp += strlen(bp) + 1; 202 net_entry.n_addrtype = 203 (class == C_IN) ? AF_INET : AF_UNSPEC; 204 haveanswer++; 205 } 206 } 207 if (haveanswer) { 208 *ap = NULL; 209 switch (net_i) { 210 case BYADDR: 211 net_entry.n_name = *net_entry.n_aliases; 212 net_entry.n_net = 0L; 213 break; 214 case BYNAME: 215 in = *net_entry.n_aliases; 216 net_entry.n_name = &ans[0]; 217 aux2[0] = '\0'; 218 for (i = 0; i < 4; i++) { 219 for (st = in, nchar = 0; 220 *st != '.'; 221 st++, nchar++) 222 ; 223 if (nchar != 1 || *in != '0' || flag) { 224 flag = 1; 225 (void)strncpy(paux1, 226 (i==0) ? in : in-1, 227 (size_t)((i==0) ? nchar : nchar+1)); 228 paux1[(i==0) ? nchar : nchar+1] = '\0'; 229 pauxt = paux2; 230 paux2 = strcat(paux1, paux2); 231 paux1 = pauxt; 232 } 233 in = ++st; 234 } 235 net_entry.n_net = inet_network(paux2); 236 break; 237 } 238 net_entry.n_aliases++; 239 return (&net_entry); 240 } 241 h_errno = TRY_AGAIN; 242 return (NULL); 243 } 244 245 /*ARGSUSED*/ 246 int 247 _files_getnetbyaddr(rv, cb_data, ap) 248 void *rv; 249 void *cb_data; 250 va_list ap; 251 { 252 struct netent *p; 253 unsigned long net; 254 int type; 255 256 _DIAGASSERT(rv != NULL); 257 258 net = va_arg(ap, unsigned long); 259 type = va_arg(ap, int); 260 261 setnetent(_net_stayopen); 262 while ((p = getnetent()) != NULL) 263 if (p->n_addrtype == type && p->n_net == net) 264 break; 265 if (!_net_stayopen) 266 endnetent(); 267 *((struct netent **)rv) = p; 268 if (p==NULL) { 269 h_errno = HOST_NOT_FOUND; 270 return NS_NOTFOUND; 271 } 272 return NS_SUCCESS; 273 } 274 275 /*ARGSUSED*/ 276 int 277 _dns_getnetbyaddr(rv, cb_data, ap) 278 void *rv; 279 void *cb_data; 280 va_list ap; 281 { 282 unsigned int netbr[4]; 283 int nn, anslen; 284 querybuf buf; 285 char qbuf[MAXDNAME]; 286 unsigned long net2; 287 struct netent *np; 288 unsigned long net; 289 int type; 290 291 _DIAGASSERT(rv != NULL); 292 293 net = va_arg(ap, unsigned long); 294 type = va_arg(ap, int); 295 296 if (type != AF_INET) 297 return NS_UNAVAIL; 298 299 for (nn = 4, net2 = net; net2; net2 >>= 8) 300 netbr[--nn] = (unsigned int)(net2 & 0xff); 301 switch (nn) { 302 default: 303 return NS_UNAVAIL; 304 case 3: /* Class A */ 305 snprintf(qbuf, sizeof(qbuf), "0.0.0.%u.in-addr.arpa", netbr[3]); 306 break; 307 case 2: /* Class B */ 308 snprintf(qbuf, sizeof(qbuf), "0.0.%u.%u.in-addr.arpa", 309 netbr[3], netbr[2]); 310 break; 311 case 1: /* Class C */ 312 snprintf(qbuf, sizeof(qbuf), "0.%u.%u.%u.in-addr.arpa", 313 netbr[3], netbr[2], netbr[1]); 314 break; 315 case 0: /* Class D - E */ 316 snprintf(qbuf, sizeof(qbuf), "%u.%u.%u.%u.in-addr.arpa", 317 netbr[3], netbr[2], netbr[1], netbr[0]); 318 break; 319 } 320 anslen = res_query(qbuf, C_IN, T_PTR, (u_char *)(void *)&buf, 321 sizeof(buf)); 322 if (anslen < 0) { 323 #ifdef DEBUG 324 if (_res.options & RES_DEBUG) 325 printf("res_query failed\n"); 326 #endif 327 return NS_NOTFOUND; 328 } 329 np = getnetanswer(&buf, anslen, BYADDR); 330 if (np) { 331 /* maybe net should be unsigned? */ 332 unsigned long u_net = net; 333 334 /* Strip trailing zeros */ 335 while ((u_net & 0xff) == 0 && u_net != 0) 336 u_net >>= 8; 337 np->n_net = u_net; 338 } 339 *((struct netent **)rv) = np; 340 if (np == NULL) { 341 h_errno = HOST_NOT_FOUND; 342 return NS_NOTFOUND; 343 } 344 return NS_SUCCESS; 345 } 346 347 348 struct netent * 349 getnetbyaddr(net, net_type) 350 u_long net; 351 int net_type; 352 { 353 struct netent *np; 354 static const ns_dtab dtab[] = { 355 NS_FILES_CB(_files_getnetbyaddr, NULL) 356 { NSSRC_DNS, _dns_getnetbyaddr, NULL }, /* force -DHESIOD */ 357 NS_NIS_CB(_yp_getnetbyaddr, NULL) 358 { 0 } 359 }; 360 361 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 362 h_errno = NETDB_INTERNAL; 363 return (NULL); 364 } 365 366 np = NULL; 367 h_errno = NETDB_INTERNAL; 368 if (nsdispatch(&np, dtab, NSDB_NETWORKS, "getnetbyaddr", __nsdefaultsrc, 369 net, net_type) != NS_SUCCESS) 370 return (NULL); 371 h_errno = NETDB_SUCCESS; 372 return (np); 373 } 374 375 /*ARGSUSED*/ 376 int 377 _files_getnetbyname(rv, cb_data, ap) 378 void *rv; 379 void *cb_data; 380 va_list ap; 381 { 382 struct netent *p; 383 char **cp; 384 const char *name; 385 386 _DIAGASSERT(rv != NULL); 387 388 name = va_arg(ap, const char *); 389 setnetent(_net_stayopen); 390 while ((p = getnetent()) != NULL) { 391 if (strcasecmp(p->n_name, name) == 0) 392 break; 393 for (cp = p->n_aliases; *cp != 0; cp++) 394 if (strcasecmp(*cp, name) == 0) 395 goto found; 396 } 397 found: 398 if (!_net_stayopen) 399 endnetent(); 400 *((struct netent **)rv) = p; 401 if (p==NULL) { 402 h_errno = HOST_NOT_FOUND; 403 return NS_NOTFOUND; 404 } 405 return NS_SUCCESS; 406 } 407 408 /*ARGSUSED*/ 409 int 410 _dns_getnetbyname(rv, cb_data, ap) 411 void *rv; 412 void *cb_data; 413 va_list ap; 414 { 415 int anslen; 416 querybuf buf; 417 char qbuf[MAXDNAME]; 418 struct netent *np; 419 const char *net; 420 421 _DIAGASSERT(rv != NULL); 422 423 net = va_arg(ap, const char *); 424 strcpy(&qbuf[0], net); 425 anslen = res_search(qbuf, C_IN, T_PTR, (u_char *)(void *)&buf, 426 sizeof(buf)); 427 if (anslen < 0) { 428 #ifdef DEBUG 429 if (_res.options & RES_DEBUG) 430 printf("res_query failed\n"); 431 #endif 432 return NS_NOTFOUND; 433 } 434 np = getnetanswer(&buf, anslen, BYNAME); 435 436 *((struct netent **)rv) = np; 437 if (np == NULL) { 438 h_errno = HOST_NOT_FOUND; 439 return NS_NOTFOUND; 440 } 441 return NS_SUCCESS; 442 } 443 444 struct netent * 445 getnetbyname(net) 446 const char *net; 447 { 448 struct netent *np; 449 static const ns_dtab dtab[] = { 450 NS_FILES_CB(_files_getnetbyname, NULL) 451 { NSSRC_DNS, _dns_getnetbyname, NULL }, /* force -DHESIOD */ 452 NS_NIS_CB(_yp_getnetbyname, NULL) 453 { 0 } 454 }; 455 456 _DIAGASSERT(net != NULL); 457 458 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 459 h_errno = NETDB_INTERNAL; 460 return (NULL); 461 } 462 463 np = NULL; 464 h_errno = NETDB_INTERNAL; 465 if (nsdispatch(&np, dtab, NSDB_NETWORKS, "getnetbyname", __nsdefaultsrc, 466 net) != NS_SUCCESS) 467 return (NULL); 468 h_errno = NETDB_SUCCESS; 469 return (np); 470 } 471 472 #ifdef YP 473 /*ARGSUSED*/ 474 int 475 _yp_getnetbyaddr(rv, cb_data, ap) 476 void *rv; 477 void *cb_data; 478 va_list ap; 479 { 480 struct netent *np; 481 char qbuf[MAXDNAME]; 482 unsigned int netbr[4]; 483 unsigned long net, net2; 484 int type, r; 485 486 _DIAGASSERT(rv != NULL); 487 488 net = va_arg(ap, unsigned long); 489 type = va_arg(ap, int); 490 491 if (type != AF_INET) 492 return NS_UNAVAIL; 493 494 if (!__ypdomain) { 495 if (_yp_check(&__ypdomain) == 0) 496 return NS_UNAVAIL; 497 } 498 np = NULL; 499 if (__ypcurrent) 500 free(__ypcurrent); 501 __ypcurrent = NULL; 502 for (r = 4, net2 = net; net2; net2 >>= 8) 503 netbr[--r] = (unsigned int)(net2 & 0xff); 504 switch (r) { 505 default: 506 return NS_UNAVAIL; 507 case 3: /* Class A */ 508 snprintf(qbuf, sizeof(qbuf), "%u", netbr[0]); 509 break; 510 case 2: /* Class B */ 511 snprintf(qbuf, sizeof(qbuf), "%u.%u", netbr[0], netbr[1]); 512 break; 513 case 1: /* Class C */ 514 snprintf(qbuf, sizeof(qbuf), "%u.%u.%u", netbr[0], netbr[1], 515 netbr[2]); 516 break; 517 case 0: /* Class D - E */ 518 snprintf(qbuf, sizeof(qbuf), "%u.%u.%u.%u", netbr[0], netbr[1], 519 netbr[2], netbr[3]); 520 break; 521 } 522 r = yp_match(__ypdomain, "networks.byaddr", qbuf, (int)strlen(qbuf), 523 &__ypcurrent, &__ypcurrentlen); 524 if (r == 0) 525 np = _ypnetent(__ypcurrent); 526 527 *((struct netent **)rv) = np; 528 if (np == NULL) { 529 h_errno = HOST_NOT_FOUND; 530 return NS_NOTFOUND; 531 } 532 return NS_SUCCESS; 533 534 } 535 536 int 537 /*ARGSUSED*/ 538 _yp_getnetbyname(rv, cb_data, ap) 539 void *rv; 540 void *cb_data; 541 va_list ap; 542 { 543 struct netent *np; 544 const char *name; 545 int r; 546 547 _DIAGASSERT(rv != NULL); 548 549 name = va_arg(ap, const char *); 550 551 if (!__ypdomain) { 552 if (_yp_check(&__ypdomain) == 0) 553 return NS_UNAVAIL; 554 } 555 np = NULL; 556 if (__ypcurrent) 557 free(__ypcurrent); 558 __ypcurrent = NULL; 559 r = yp_match(__ypdomain, "networks.byname", name, (int)strlen(name), 560 &__ypcurrent, &__ypcurrentlen); 561 if (r == 0) 562 np = _ypnetent(__ypcurrent); 563 564 *((struct netent **)rv) = np; 565 if (np == NULL) { 566 h_errno = HOST_NOT_FOUND; 567 return NS_NOTFOUND; 568 } 569 return NS_SUCCESS; 570 } 571 572 struct netent * 573 _ypnetent(line) 574 char *line; 575 { 576 char *cp, *p, **q; 577 578 _DIAGASSERT(line != NULL); 579 580 net_entry.n_name = line; 581 cp = strpbrk(line, " \t"); 582 if (cp == NULL) 583 return (NULL); 584 *cp++ = '\0'; 585 while (*cp == ' ' || *cp == '\t') 586 cp++; 587 p = strpbrk(cp, " \t"); 588 if (p != NULL) 589 *p++ = '\0'; 590 net_entry.n_net = inet_network(cp); 591 net_entry.n_addrtype = AF_INET; 592 q = net_entry.n_aliases = net_aliases; 593 if (p != NULL) { 594 cp = p; 595 while (cp && *cp) { 596 if (*cp == ' ' || *cp == '\t') { 597 cp++; 598 continue; 599 } 600 if (q < &net_aliases[MAXALIASES - 1]) 601 *q++ = cp; 602 cp = strpbrk(cp, " \t"); 603 if (cp != NULL) 604 *cp++ = '\0'; 605 } 606 } 607 *q = NULL; 608 609 return (&net_entry); 610 } 611 #endif 612
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