Annotation of src/lib/libc/resolv/res_data.c, Revision 1.12
1.12 ! christos 1: /* $NetBSD: res_data.c,v 1.1.1.4 2009/04/12 16:35:47 christos Exp $ */
1.1 christos 2:
3: /*
4: * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5: * Copyright (c) 1995-1999 by Internet Software Consortium.
6: *
7: * Permission to use, copy, modify, and distribute this software for any
8: * purpose with or without fee is hereby granted, provided that the above
9: * copyright notice and this permission notice appear in all copies.
10: *
11: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
12: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
14: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
17: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18: */
19:
1.4 christos 20: #include <sys/cdefs.h>
1.1 christos 21: #if defined(LIBC_SCCS) && !defined(lint)
1.4 christos 22: #ifdef notdef
1.12 ! christos 23: static const char rcsid[] = "Id: res_data.c,v 1.7 2008/12/11 09:59:00 marka Exp";
1.4 christos 24: #else
1.12 ! christos 25: __RCSID("$NetBSD: res_data.c,v 1.11 2008/06/21 20:41:48 christos Exp $");
1.4 christos 26: #endif
1.1 christos 27: #endif /* LIBC_SCCS and not lint */
28:
29: #include "port_before.h"
30:
1.5 christos 31: #include "namespace.h"
1.1 christos 32: #include <sys/types.h>
33: #include <sys/param.h>
34: #include <sys/socket.h>
35: #include <sys/time.h>
36:
37: #include <netinet/in.h>
38: #include <arpa/inet.h>
39: #include <arpa/nameser.h>
40:
41: #include <ctype.h>
42: #include <netdb.h>
43: #include <resolv.h>
44: #include <res_update.h>
45: #include <stdio.h>
46: #include <stdlib.h>
47: #include <string.h>
48: #include <unistd.h>
49:
50: #include "port_after.h"
1.5 christos 51:
52: #ifdef __weak_alias
53: __weak_alias(res_init,_res_init)
54: __weak_alias(res_mkquery,_res_mkquery)
1.7 christos 55: __weak_alias(res_query,_res_query)
56: __weak_alias(res_search,_res_search)
57: __weak_alias(res_send,__res_send)
58: __weak_alias(res_close,__res_close)
59: /* XXX: these leaked in the old bind8 libc */
60: __weak_alias(res_querydomain,__res_querydomain)
1.5 christos 61: __weak_alias(res_send_setqhook,__res_send_setqhook)
62: __weak_alias(res_send_setrhook,__res_send_setrhook)
1.7 christos 63: #if 0
64: __weak_alias(p_query,__p_query)
65: __weak_alias(fp_query,__fp_query)
66: __weak_alias(fp_nquery,__fp_nquery)
1.5 christos 67: __weak_alias(res_isourserver,__res_isourserver)
68: __weak_alias(res_opt,_res_opt)
69: __weak_alias(hostalias,__hostalias)
70: #endif
1.6 christos 71: #endif
1.5 christos 72:
1.1 christos 73: const char *_res_opcodes[] = {
74: "QUERY",
75: "IQUERY",
76: "CQUERYM",
1.9 christos 77: "CQUERYU", /*%< experimental */
78: "NOTIFY", /*%< experimental */
1.1 christos 79: "UPDATE",
80: "6",
81: "7",
82: "8",
83: "9",
84: "10",
85: "11",
86: "12",
87: "13",
88: "ZONEINIT",
89: "ZONEREF",
90: };
91:
92: #ifdef BIND_UPDATE
93: const char *_res_sectioncodes[] = {
94: "ZONE",
95: "PREREQUISITES",
96: "UPDATE",
97: "ADDITIONAL",
98: };
99: #endif
100:
1.8 christos 101: #ifndef __BIND_NOSTATIC
102: extern struct __res_state _nres;
1.1 christos 103:
104: /* Proto. */
105:
1.2 christos 106: int res_ourserver_p(const res_state, const struct sockaddr *);
1.1 christos 107:
108: int
109: res_init(void) {
1.8 christos 110: int rv;
1.1 christos 111: extern int __res_vinit(res_state, int);
1.8 christos 112: #ifdef COMPAT__RES
113: /*
114: * Compatibility with program that were accessing _res directly
115: * to set options. We keep another struct res that is the same
116: * size as the original res structure, and then copy fields to
117: * it so that we achieve the same initialization
118: */
119: extern void *__res_get_old_state(void);
120: extern void __res_put_old_state(void *);
121: res_state ores = __res_get_old_state();
122:
123: if (ores->options != 0)
124: _nres.options = ores->options;
125: if (ores->retrans != 0)
126: _nres.retrans = ores->retrans;
127: if (ores->retry != 0)
128: _nres.retry = ores->retry;
129: #endif
1.1 christos 130:
131: /*
132: * These three fields used to be statically initialized. This made
133: * it hard to use this code in a shared library. It is necessary,
134: * now that we're doing dynamic initialization here, that we preserve
135: * the old semantics: if an application modifies one of these three
136: * fields of _res before res_init() is called, res_init() will not
137: * alter them. Of course, if an application is setting them to
138: * _zero_ before calling res_init(), hoping to override what used
139: * to be the static default, we can't detect it and unexpected results
140: * will follow. Zero for any of these fields would make no sense,
141: * so one can safely assume that the applications were already getting
142: * unexpected results.
143: *
1.8 christos 144: * _nres.options is tricky since some apps were known to diddle the bits
1.1 christos 145: * before res_init() was first called. We can't replicate that semantic
146: * with dynamic initialization (they may have turned bits off that are
147: * set in RES_DEFAULT). Our solution is to declare such applications
148: * "broken". They could fool us by setting RES_INIT but none do (yet).
149: */
1.8 christos 150: if (!_nres.retrans)
151: _nres.retrans = RES_TIMEOUT;
152: if (!_nres.retry)
153: _nres.retry = 4;
154: if (!(_nres.options & RES_INIT))
155: _nres.options = RES_DEFAULT;
1.1 christos 156:
157: /*
158: * This one used to initialize implicitly to zero, so unless the app
159: * has set it to something in particular, we can randomize it now.
160: */
1.8 christos 161: if (!_nres.id)
1.12 ! christos 162: _nres.id = res_nrandomid(&_nres);
1.1 christos 163:
1.8 christos 164: rv = __res_vinit(&_nres, 1);
165: #ifdef COMPAT__RES
166: __res_put_old_state(&_nres);
167: #endif
168: return rv;
1.1 christos 169: }
170:
171: void
172: p_query(const u_char *msg) {
173: fp_query(msg, stdout);
174: }
175:
176: void
177: fp_query(const u_char *msg, FILE *file) {
178: fp_nquery(msg, PACKETSZ, file);
179: }
180:
181: void
182: fp_nquery(const u_char *msg, int len, FILE *file) {
1.8 christos 183: if ((_nres.options & RES_INIT) == 0U && res_init() == -1)
1.1 christos 184: return;
185:
1.8 christos 186: res_pquery(&_nres, msg, len, file);
1.1 christos 187: }
188:
189: int
1.9 christos 190: res_mkquery(int op, /*!< opcode of query */
191: const char *dname, /*!< domain name */
192: int class, int type, /*!< class and type of query */
193: const u_char *data, /*!< resource record data */
194: int datalen, /*!< length of data */
195: const u_char *newrr_in, /*!< new rr for modify or append */
196: u_char *buf, /*!< buffer to put query */
197: int buflen) /*!< size of buffer */
1.1 christos 198: {
1.8 christos 199: if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
200: RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
1.1 christos 201: return (-1);
202: }
1.8 christos 203: return (res_nmkquery(&_nres, op, dname, class, type,
1.1 christos 204: data, datalen,
205: newrr_in, buf, buflen));
206: }
207:
1.2 christos 208: #ifdef _LIBRESOLV
1.1 christos 209: int
210: res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
1.8 christos 211: if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
212: RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
1.1 christos 213: return (-1);
214: }
215:
1.8 christos 216: return (res_nmkupdate(&_nres, rrecp_in, buf, buflen));
1.1 christos 217: }
1.2 christos 218: #endif
1.1 christos 219:
220: int
1.9 christos 221: res_query(const char *name, /*!< domain name */
222: int class, int type, /*!< class and type of query */
223: u_char *answer, /*!< buffer to put answer */
224: int anslen) /*!< size of answer buffer */
1.1 christos 225: {
1.8 christos 226: if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
227: RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
1.1 christos 228: return (-1);
229: }
1.8 christos 230: return (res_nquery(&_nres, name, class, type, answer, anslen));
1.1 christos 231: }
232:
233: void
234: res_send_setqhook(res_send_qhook hook) {
1.8 christos 235: _nres.qhook = hook;
1.1 christos 236: }
237:
238: void
239: res_send_setrhook(res_send_rhook hook) {
1.8 christos 240: _nres.rhook = hook;
1.1 christos 241: }
242:
243: int
244: res_isourserver(const struct sockaddr_in *inp) {
1.8 christos 245: return (res_ourserver_p(&_nres, (const struct sockaddr *)(const void *)inp));
1.1 christos 246: }
247:
248: int
249: res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
1.8 christos 250: if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
1.1 christos 251: /* errno should have been set by res_init() in this case. */
252: return (-1);
253: }
254:
1.8 christos 255: return (res_nsend(&_nres, buf, buflen, ans, anssiz));
1.1 christos 256: }
257:
1.2 christos 258: #ifdef _LIBRESOLV
1.1 christos 259: int
260: res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
261: u_char *ans, int anssiz)
262: {
1.8 christos 263: if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
1.1 christos 264: /* errno should have been set by res_init() in this case. */
265: return (-1);
266: }
267:
1.8 christos 268: return (res_nsendsigned(&_nres, buf, buflen, key, ans, anssiz));
1.1 christos 269: }
1.2 christos 270: #endif
1.1 christos 271:
272: void
273: res_close(void) {
1.8 christos 274: res_nclose(&_nres);
1.1 christos 275: }
276:
1.2 christos 277: #ifdef _LIBRESOLV
1.1 christos 278: int
279: res_update(ns_updrec *rrecp_in) {
1.8 christos 280: if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
281: RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
1.1 christos 282: return (-1);
283: }
284:
1.8 christos 285: return (res_nupdate(&_nres, rrecp_in, NULL));
1.1 christos 286: }
1.2 christos 287: #endif
1.1 christos 288:
289: int
1.9 christos 290: res_search(const char *name, /*!< domain name */
291: int class, int type, /*!< class and type of query */
292: u_char *answer, /*!< buffer to put answer */
293: int anslen) /*!< size of answer */
1.1 christos 294: {
1.8 christos 295: if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
296: RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
1.1 christos 297: return (-1);
298: }
299:
1.8 christos 300: return (res_nsearch(&_nres, name, class, type, answer, anslen));
1.1 christos 301: }
302:
303: int
304: res_querydomain(const char *name,
305: const char *domain,
1.9 christos 306: int class, int type, /*!< class and type of query */
307: u_char *answer, /*!< buffer to put answer */
308: int anslen) /*!< size of answer */
1.1 christos 309: {
1.8 christos 310: if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
311: RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
1.1 christos 312: return (-1);
313: }
314:
1.8 christos 315: return (res_nquerydomain(&_nres, name, domain,
1.1 christos 316: class, type,
317: answer, anslen));
318: }
319:
1.2 christos 320: int
321: res_opt(int a, u_char *b, int c, int d)
322: {
1.8 christos 323: return res_nopt(&_nres, a, b, c, d);
1.2 christos 324: }
325:
1.12 ! christos 326: u_int
! 327: res_randomid(void) {
! 328: if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
! 329: RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
! 330: return (-1);
! 331: }
! 332:
! 333: return (res_nrandomid(&_nres));
! 334: }
! 335:
1.1 christos 336: const char *
337: hostalias(const char *name) {
338: static char abuf[MAXDNAME];
339:
1.8 christos 340: return (res_hostalias(&_nres, name, abuf, sizeof abuf));
1.1 christos 341: }
342:
343: #ifdef ultrix
344: int
345: local_hostname_length(const char *hostname) {
346: int len_host, len_domain;
347:
1.8 christos 348: if (!*_nres.defdname)
1.1 christos 349: res_init();
350: len_host = strlen(hostname);
1.8 christos 351: len_domain = strlen(_nres.defdname);
1.1 christos 352: if (len_host > len_domain &&
1.8 christos 353: !strcasecmp(hostname + len_host - len_domain, _nres.defdname) &&
1.1 christos 354: hostname[len_host - len_domain - 1] == '.')
355: return (len_host - len_domain - 1);
356: return (0);
357: }
358: #endif /*ultrix*/
359:
360: #endif
1.9 christos 361:
362: /*! \file */
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