getnetnamadr.c revision 1.10
1 /* $NetBSD: getnetnamadr.c,v 1.10 1999/01/19 04:10:23 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 1.10 1999/01/19 04:10:23 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 <ctype.h> 63 #include <errno.h> 64 #include <netdb.h> 65 #include <nsswitch.h> 66 #include <resolv.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 71 #ifdef YP 72 #include <rpc/rpc.h> 73 #include <rpcsvc/yp_prot.h> 74 #include <rpcsvc/ypclnt.h> 75 #endif 76 77 #ifdef __weak_alias 78 __weak_alias(getnetbyaddr,_getnetbyaddr); 79 __weak_alias(getnetbyname,_getnetbyname); 80 #endif 81 82 extern int h_errno; 83 extern int _net_stayopen; 84 85 #if defined(mips) && defined(SYSTYPE_BSD43) 86 extern int errno; 87 #endif 88 89 #define BYADDR 0 90 #define BYNAME 1 91 #define MAXALIASES 35 92 93 #if PACKETSZ > 1024 94 #define MAXPACKET PACKETSZ 95 #else 96 #define MAXPACKET 1024 97 #endif 98 99 typedef union { 100 HEADER hdr; 101 u_char buf[MAXPACKET]; 102 } querybuf; 103 104 typedef union { 105 long al; 106 char ac; 107 } align; 108 109 #ifdef YP 110 static char *__ypdomain; 111 static char *__ypcurrent; 112 static int __ypcurrentlen; 113 #endif 114 115 static struct netent net_entry; 116 static char *net_aliases[MAXALIASES]; 117 118 static struct netent *getnetanswer __P((querybuf *, int, int)); 119 int _getnetbyaddr __P((void *, void *, va_list)); 120 int _getnetbyname __P((void *, void *, va_list)); 121 int _dns_getnetbyaddr __P((void *, void *, va_list)); 122 int _dns_getnetbyname __P((void *, void *, va_list)); 123 #ifdef YP 124 int _yp_getnetbyaddr __P((void *, void *, va_list)); 125 int _yp_getnetbyname __P((void *, void *, va_list)); 126 struct netent *_ypnetent __P((char *)); 127 #endif 128 129 static struct netent * 130 getnetanswer(answer, anslen, net_i) 131 querybuf *answer; 132 int anslen; 133 int net_i; 134 { 135 136 HEADER *hp; 137 u_char *cp; 138 int n; 139 u_char *eom; 140 int type, class, buflen, ancount, qdcount, haveanswer, i, nchar; 141 char aux1[30], aux2[30], ans[30], *in, *st, *pauxt, *bp, **ap, 142 *paux1 = &aux1[0], *paux2 = &aux2[0], flag = 0; 143 static char netbuf[PACKETSZ]; 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 buflen = 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 cp += __dn_skipname(cp, eom) + QFIXEDSZ; 175 ap = net_aliases; 176 *ap = NULL; 177 net_entry.n_aliases = net_aliases; 178 haveanswer = 0; 179 while (--ancount >= 0 && cp < eom) { 180 n = dn_expand(answer->buf, eom, cp, bp, buflen); 181 if ((n < 0) || !res_dnok(bp)) 182 break; 183 cp += n; 184 ans[0] = '\0'; 185 (void)strcpy(&ans[0], bp); 186 GETSHORT(type, cp); 187 GETSHORT(class, cp); 188 cp += INT32SZ; /* TTL */ 189 GETSHORT(n, cp); 190 if (class == C_IN && type == T_PTR) { 191 n = dn_expand(answer->buf, eom, cp, bp, buflen); 192 if ((n < 0) || !res_hnok(bp)) { 193 cp += n; 194 return (NULL); 195 } 196 cp += n; 197 *ap++ = bp; 198 bp += strlen(bp) + 1; 199 net_entry.n_addrtype = 200 (class == C_IN) ? AF_INET : AF_UNSPEC; 201 haveanswer++; 202 } 203 } 204 if (haveanswer) { 205 *ap = NULL; 206 switch (net_i) { 207 case BYADDR: 208 net_entry.n_name = *net_entry.n_aliases; 209 net_entry.n_net = 0L; 210 break; 211 case BYNAME: 212 in = *net_entry.n_aliases; 213 net_entry.n_name = &ans[0]; 214 aux2[0] = '\0'; 215 for (i = 0; i < 4; i++) { 216 for (st = in, nchar = 0; 217 *st != '.'; 218 st++, nchar++) 219 ; 220 if (nchar != 1 || *in != '0' || flag) { 221 flag = 1; 222 (void)strncpy(paux1, 223 (i==0) ? in : in-1, 224 (size_t)((i==0) ? nchar : nchar+1)); 225 paux1[(i==0) ? nchar : nchar+1] = '\0'; 226 pauxt = paux2; 227 paux2 = strcat(paux1, paux2); 228 paux1 = pauxt; 229 } 230 in = ++st; 231 } 232 net_entry.n_net = inet_network(paux2); 233 break; 234 } 235 net_entry.n_aliases++; 236 return (&net_entry); 237 } 238 h_errno = TRY_AGAIN; 239 return (NULL); 240 } 241 242 int 243 _getnetbyaddr(rv, cb_data, ap) 244 void *rv; 245 void *cb_data; 246 va_list ap; 247 { 248 struct netent *p; 249 unsigned long net; 250 int type; 251 252 net = va_arg(ap, unsigned long); 253 type = va_arg(ap, int); 254 255 setnetent(_net_stayopen); 256 while ((p = getnetent()) != NULL) 257 if (p->n_addrtype == type && p->n_net == net) 258 break; 259 if (!_net_stayopen) 260 endnetent(); 261 *((struct netent **)rv) = p; 262 if (p==NULL) { 263 h_errno = HOST_NOT_FOUND; 264 return NS_NOTFOUND; 265 } 266 return NS_SUCCESS; 267 } 268 269 int 270 _dns_getnetbyaddr(rv, cb_data, ap) 271 void *rv; 272 void *cb_data; 273 va_list ap; 274 { 275 unsigned int netbr[4]; 276 int nn, anslen; 277 querybuf buf; 278 char qbuf[MAXDNAME]; 279 unsigned long net2; 280 struct netent *np; 281 unsigned long net; 282 int type; 283 284 net = va_arg(ap, unsigned long); 285 type = va_arg(ap, int); 286 287 if (type != AF_INET) 288 return NS_UNAVAIL; 289 290 for (nn = 4, net2 = net; net2; net2 >>= 8) 291 netbr[--nn] = (unsigned int)(net2 & 0xff); 292 switch (nn) { 293 default: 294 return NS_UNAVAIL; 295 case 3: /* Class A */ 296 sprintf(qbuf, "0.0.0.%u.in-addr.arpa", netbr[3]); 297 break; 298 case 2: /* Class B */ 299 sprintf(qbuf, "0.0.%u.%u.in-addr.arpa", netbr[3], netbr[2]); 300 break; 301 case 1: /* Class C */ 302 sprintf(qbuf, "0.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2], 303 netbr[1]); 304 break; 305 case 0: /* Class D - E */ 306 sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2], 307 netbr[1], netbr[0]); 308 break; 309 } 310 anslen = res_query(qbuf, C_IN, T_PTR, (u_char *)(void *)&buf, 311 sizeof(buf)); 312 if (anslen < 0) { 313 #ifdef DEBUG 314 if (_res.options & RES_DEBUG) 315 printf("res_query failed\n"); 316 #endif 317 return NS_NOTFOUND; 318 } 319 np = getnetanswer(&buf, anslen, BYADDR); 320 if (np) { 321 /* maybe net should be unsigned? */ 322 unsigned long u_net = net; 323 324 /* Strip trailing zeros */ 325 while ((u_net & 0xff) == 0 && u_net != 0) 326 u_net >>= 8; 327 np->n_net = u_net; 328 } 329 *((struct netent **)rv) = np; 330 if (np == NULL) { 331 h_errno = HOST_NOT_FOUND; 332 return NS_NOTFOUND; 333 } 334 return NS_SUCCESS; 335 } 336 337 338 struct netent * 339 getnetbyaddr(net, net_type) 340 u_long net; 341 int net_type; 342 { 343 struct netent *np; 344 static ns_dtab dtab[] = { 345 NS_FILES_CB(_getnetbyaddr, NULL), 346 { NSSRC_DNS, _dns_getnetbyaddr, NULL }, /* force -DHESIOD */ 347 NS_NIS_CB(_yp_getnetbyaddr, NULL), 348 { NULL, NULL, NULL } 349 }; 350 351 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 352 h_errno = NETDB_INTERNAL; 353 return (NULL); 354 } 355 356 np = NULL; 357 h_errno = NETDB_INTERNAL; 358 if (nsdispatch(&np, dtab, NSDB_NETWORKS, net, net_type) != NS_SUCCESS) 359 return (NULL); 360 h_errno = NETDB_SUCCESS; 361 return (np); 362 } 363 364 int 365 _getnetbyname(rv, cb_data, ap) 366 void *rv; 367 void *cb_data; 368 va_list ap; 369 { 370 struct netent *p; 371 char **cp; 372 const char *name; 373 374 name = va_arg(ap, const char *); 375 setnetent(_net_stayopen); 376 while ((p = getnetent()) != NULL) { 377 if (strcasecmp(p->n_name, name) == 0) 378 break; 379 for (cp = p->n_aliases; *cp != 0; cp++) 380 if (strcasecmp(*cp, name) == 0) 381 goto found; 382 } 383 found: 384 if (!_net_stayopen) 385 endnetent(); 386 *((struct netent **)rv) = p; 387 if (p==NULL) { 388 h_errno = HOST_NOT_FOUND; 389 return NS_NOTFOUND; 390 } 391 return NS_SUCCESS; 392 } 393 394 int 395 _dns_getnetbyname(rv, cb_data, ap) 396 void *rv; 397 void *cb_data; 398 va_list ap; 399 { 400 int anslen; 401 querybuf buf; 402 char qbuf[MAXDNAME]; 403 struct netent *np; 404 const char *net; 405 406 net = va_arg(ap, const char *); 407 strcpy(&qbuf[0], net); 408 anslen = res_search(qbuf, C_IN, T_PTR, (u_char *)(void *)&buf, 409 sizeof(buf)); 410 if (anslen < 0) { 411 #ifdef DEBUG 412 if (_res.options & RES_DEBUG) 413 printf("res_query failed\n"); 414 #endif 415 return NS_NOTFOUND; 416 } 417 np = getnetanswer(&buf, anslen, BYNAME); 418 419 *((struct netent **)rv) = np; 420 if (np == NULL) { 421 h_errno = HOST_NOT_FOUND; 422 return NS_NOTFOUND; 423 } 424 return NS_SUCCESS; 425 } 426 427 struct netent * 428 getnetbyname(net) 429 const char *net; 430 { 431 struct netent *np; 432 static ns_dtab dtab[] = { 433 NS_FILES_CB(_getnetbyname, NULL), 434 { NSSRC_DNS, _dns_getnetbyname, NULL }, /* force -DHESIOD */ 435 NS_NIS_CB(_yp_getnetbyname, NULL), 436 { NULL, NULL, NULL } 437 }; 438 439 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 440 h_errno = NETDB_INTERNAL; 441 return (NULL); 442 } 443 444 np = NULL; 445 h_errno = NETDB_INTERNAL; 446 if (nsdispatch(&np, dtab, NSDB_NETWORKS, net) != NS_SUCCESS) 447 return (NULL); 448 h_errno = NETDB_SUCCESS; 449 return (np); 450 } 451 452 #ifdef YP 453 454 int 455 _yp_getnetbyaddr(rv, cb_data, ap) 456 void *rv; 457 void *cb_data; 458 va_list ap; 459 { 460 struct netent *np; 461 char qbuf[MAXDNAME]; 462 unsigned int netbr[4]; 463 unsigned long net, net2; 464 int type, r; 465 466 net = va_arg(ap, unsigned long); 467 type = va_arg(ap, int); 468 469 if (type != AF_INET) 470 return NS_UNAVAIL; 471 472 if (!__ypdomain) { 473 if (_yp_check(&__ypdomain) == 0) 474 return NS_UNAVAIL; 475 } 476 np = NULL; 477 if (__ypcurrent) 478 free(__ypcurrent); 479 __ypcurrent = NULL; 480 for (r = 4, net2 = net; net2; net2 >>= 8) 481 netbr[--r] = (unsigned int)(net2 & 0xff); 482 switch (r) { 483 default: 484 return NS_UNAVAIL; 485 case 3: /* Class A */ 486 sprintf(qbuf, "%u", netbr[0]); 487 break; 488 case 2: /* Class B */ 489 sprintf(qbuf, "%u.%u", netbr[0], netbr[1]); 490 break; 491 case 1: /* Class C */ 492 sprintf(qbuf, "%u.%u.%u", netbr[0], netbr[1], netbr[2]); 493 break; 494 case 0: /* Class D - E */ 495 sprintf(qbuf, "%u.%u.%u.%u", netbr[0], netbr[1], netbr[2], 496 netbr[3]); 497 break; 498 } 499 r = yp_match(__ypdomain, "networks.byaddr", qbuf, (int)strlen(qbuf), 500 &__ypcurrent, &__ypcurrentlen); 501 if (r == 0) 502 np = _ypnetent(__ypcurrent); 503 504 *((struct netent **)rv) = np; 505 if (np == NULL) { 506 h_errno = HOST_NOT_FOUND; 507 return NS_NOTFOUND; 508 } 509 return NS_SUCCESS; 510 511 } 512 513 int 514 _yp_getnetbyname(rv, cb_data, ap) 515 void *rv; 516 void *cb_data; 517 va_list ap; 518 { 519 struct netent *np; 520 const char *name; 521 int r; 522 523 name = va_arg(ap, const char *); 524 525 if (!__ypdomain) { 526 if (_yp_check(&__ypdomain) == 0) 527 return NS_UNAVAIL; 528 } 529 np = NULL; 530 if (__ypcurrent) 531 free(__ypcurrent); 532 __ypcurrent = NULL; 533 r = yp_match(__ypdomain, "networks.byname", name, (int)strlen(name), 534 &__ypcurrent, &__ypcurrentlen); 535 if (r == 0) 536 np = _ypnetent(__ypcurrent); 537 538 *((struct netent **)rv) = np; 539 if (np == NULL) { 540 h_errno = HOST_NOT_FOUND; 541 return NS_NOTFOUND; 542 } 543 return NS_SUCCESS; 544 } 545 546 struct netent * 547 _ypnetent(line) 548 char *line; 549 { 550 char *cp, *p, **q; 551 552 net_entry.n_name = line; 553 cp = strpbrk(line, " \t"); 554 if (cp == NULL) 555 return (NULL); 556 *cp++ = '\0'; 557 while (*cp == ' ' || *cp == '\t') 558 cp++; 559 p = strpbrk(cp, " \t"); 560 if (p != NULL) 561 *p++ = '\0'; 562 net_entry.n_net = inet_network(cp); 563 net_entry.n_addrtype = AF_INET; 564 q = net_entry.n_aliases = net_aliases; 565 if (p != NULL) { 566 cp = p; 567 while (cp && *cp) { 568 if (*cp == ' ' || *cp == '\t') { 569 cp++; 570 continue; 571 } 572 if (q < &net_aliases[MAXALIASES - 1]) 573 *q++ = cp; 574 cp = strpbrk(cp, " \t"); 575 if (cp != NULL) 576 *cp++ = '\0'; 577 } 578 } 579 *q = NULL; 580 581 return (&net_entry); 582 } 583 #endif 584
Indexes created Tue Sep 23 20:09:58 GMT 2025