1 | /* |
2 | * Copyright (c) 1995-1999 by Internet Software Consortium. |
3 | * |
4 | * Permission to use, copy, modify, and distribute this software for any |
5 | * purpose with or without fee is hereby granted, provided that the above |
6 | * copyright notice and this permission notice appear in all copies. |
7 | * |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
9 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
10 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
11 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
12 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
13 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
14 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
15 | * SOFTWARE. |
16 | */ |
17 | |
18 | #if defined(LIBC_SCCS) && !defined(lint) |
19 | static const char rcsid[] = "$BINDId: res_data.c,v 8.17 1999/10/13 17:11:31 vixie Exp $" ; |
20 | #endif /* LIBC_SCCS and not lint */ |
21 | |
22 | #include <sys/types.h> |
23 | #include <sys/param.h> |
24 | #include <sys/socket.h> |
25 | #include <sys/time.h> |
26 | |
27 | #include <netinet/in.h> |
28 | #include <arpa/inet.h> |
29 | #include <arpa/nameser.h> |
30 | |
31 | #include <ctype.h> |
32 | #include <netdb.h> |
33 | #include <resolv.h> |
34 | #ifdef BIND_UPDATE |
35 | #include <res_update.h> |
36 | #endif |
37 | #include <stdio.h> |
38 | #include <stdlib.h> |
39 | #include <string.h> |
40 | #include <unistd.h> |
41 | |
42 | const char *_res_opcodes[] = { |
43 | "QUERY" , |
44 | "IQUERY" , |
45 | "CQUERYM" , |
46 | "CQUERYU" , /* experimental */ |
47 | "NOTIFY" , /* experimental */ |
48 | "UPDATE" , |
49 | "6" , |
50 | "7" , |
51 | "8" , |
52 | "9" , |
53 | "10" , |
54 | "11" , |
55 | "12" , |
56 | "13" , |
57 | "ZONEINIT" , |
58 | "ZONEREF" , |
59 | }; |
60 | libresolv_hidden_data_def (_res_opcodes) |
61 | |
62 | #ifdef BIND_UPDATE |
63 | const char *_res_sectioncodes[] attribute_hidden = { |
64 | "ZONE" , |
65 | "PREREQUISITES" , |
66 | "UPDATE" , |
67 | "ADDITIONAL" , |
68 | }; |
69 | #endif |
70 | |
71 | #ifndef __BIND_NOSTATIC |
72 | #ifdef _LIBC |
73 | /* The definition has been moved to res_libc.c. */ |
74 | #else |
75 | #undef _res |
76 | struct __res_state _res |
77 | # if defined(__BIND_RES_TEXT) |
78 | = { RES_TIMEOUT, } /* Motorola, et al. */ |
79 | # endif |
80 | ; |
81 | #endif |
82 | |
83 | /* Proto. */ |
84 | #ifndef _LIBC |
85 | int res_ourserver_p(const res_state, const struct sockaddr_in *); |
86 | void res_pquery(const res_state, const u_char *, int, FILE *); |
87 | #endif |
88 | |
89 | #ifndef _LIBC |
90 | /* Moved to res_libc.c since res_init() should go into libc.so but the |
91 | rest of this file not. */ |
92 | int |
93 | res_init(void) { |
94 | extern int __res_vinit(res_state, int); |
95 | |
96 | /* |
97 | * These three fields used to be statically initialized. This made |
98 | * it hard to use this code in a shared library. It is necessary, |
99 | * now that we're doing dynamic initialization here, that we preserve |
100 | * the old semantics: if an application modifies one of these three |
101 | * fields of _res before res_init() is called, res_init() will not |
102 | * alter them. Of course, if an application is setting them to |
103 | * _zero_ before calling res_init(), hoping to override what used |
104 | * to be the static default, we can't detect it and unexpected results |
105 | * will follow. Zero for any of these fields would make no sense, |
106 | * so one can safely assume that the applications were already getting |
107 | * unexpected results. |
108 | * |
109 | * _res.options is tricky since some apps were known to diddle the bits |
110 | * before res_init() was first called. We can't replicate that semantic |
111 | * with dynamic initialization (they may have turned bits off that are |
112 | * set in RES_DEFAULT). Our solution is to declare such applications |
113 | * "broken". They could fool us by setting RES_INIT but none do (yet). |
114 | */ |
115 | if (!_res.retrans) |
116 | _res.retrans = RES_TIMEOUT; |
117 | if (!_res.retry) |
118 | _res.retry = 4; |
119 | if (!(_res.options & RES_INIT)) |
120 | _res.options = RES_DEFAULT; |
121 | |
122 | /* |
123 | * This one used to initialize implicitly to zero, so unless the app |
124 | * has set it to something in particular, we can randomize it now. |
125 | */ |
126 | if (!_res.id) |
127 | _res.id = res_randomid(); |
128 | |
129 | return (__res_vinit(&_res, 1)); |
130 | } |
131 | #endif |
132 | |
133 | void |
134 | p_query(const u_char *msg) { |
135 | fp_query(msg, stdout); |
136 | } |
137 | |
138 | void |
139 | fp_query(const u_char *msg, FILE *file) { |
140 | fp_nquery(msg, PACKETSZ, file); |
141 | } |
142 | libresolv_hidden_def (fp_query) |
143 | |
144 | void |
145 | fp_nquery(const u_char *msg, int len, FILE *file) { |
146 | if (__res_maybe_init (&_res, 0) == -1) |
147 | return; |
148 | |
149 | res_pquery(&_res, msg, len, file); |
150 | } |
151 | libresolv_hidden_def (fp_nquery) |
152 | |
153 | int |
154 | res_mkquery(int op, /* opcode of query */ |
155 | const char *dname, /* domain name */ |
156 | int class, int type, /* class and type of query */ |
157 | const u_char *data, /* resource record data */ |
158 | int datalen, /* length of data */ |
159 | const u_char *newrr_in, /* new rr for modify or append */ |
160 | u_char *buf, /* buffer to put query */ |
161 | int buflen) /* size of buffer */ |
162 | { |
163 | if (__res_maybe_init (&_res, 1) == -1) { |
164 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
165 | return (-1); |
166 | } |
167 | return (res_nmkquery(&_res, op, dname, class, type, |
168 | data, datalen, |
169 | newrr_in, buf, buflen)); |
170 | } |
171 | |
172 | #ifdef BIND_UPDATE |
173 | int |
174 | res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { |
175 | if (__res_maybe_init (&_res, 1) == -1) { |
176 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
177 | return (-1); |
178 | } |
179 | |
180 | return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); |
181 | } |
182 | #endif |
183 | |
184 | int |
185 | res_query(const char *name, /* domain name */ |
186 | int class, int type, /* class and type of query */ |
187 | u_char *answer, /* buffer to put answer */ |
188 | int anslen) /* size of answer buffer */ |
189 | { |
190 | if (__res_maybe_init (&_res, 1) == -1) { |
191 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
192 | return (-1); |
193 | } |
194 | return (res_nquery(&_res, name, class, type, answer, anslen)); |
195 | } |
196 | |
197 | void |
198 | res_send_setqhook(res_send_qhook hook) { |
199 | _res.qhook = hook; |
200 | } |
201 | |
202 | void |
203 | res_send_setrhook(res_send_rhook hook) { |
204 | _res.rhook = hook; |
205 | } |
206 | |
207 | int |
208 | res_isourserver(const struct sockaddr_in *inp) { |
209 | return (res_ourserver_p(&_res, (const struct sockaddr_in6 *) inp)); |
210 | } |
211 | |
212 | int |
213 | res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { |
214 | if (__res_maybe_init (&_res, 1) == -1) { |
215 | /* errno should have been set by res_init() in this case. */ |
216 | return (-1); |
217 | } |
218 | |
219 | return (res_nsend(&_res, buf, buflen, ans, anssiz)); |
220 | } |
221 | |
222 | #ifndef _LIBC |
223 | int |
224 | res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, |
225 | u_char *ans, int anssiz) |
226 | { |
227 | if (__res_maybe_init (&_res, 1) == -1) { |
228 | /* errno should have been set by res_init() in this case. */ |
229 | return (-1); |
230 | } |
231 | |
232 | return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); |
233 | } |
234 | #endif |
235 | |
236 | void |
237 | res_close(void) { |
238 | #ifdef _LIBC |
239 | /* |
240 | * Some stupid programs out there call res_close() before res_init(). |
241 | * Since _res._vcsock isn't explicitly initialized, these means that |
242 | * we could do a close(0), which might lead to some security problems. |
243 | * Therefore we check if res_init() was called before by looking at |
244 | * the RES_INIT bit in _res.options. If it hasn't been set we bail out |
245 | * early. */ |
246 | if ((_res.options & RES_INIT) == 0) |
247 | return; |
248 | #endif |
249 | /* We don't free the name server addresses because we never |
250 | did it and it would be done implicitly on shutdown. */ |
251 | __res_iclose(&_res, false); |
252 | } |
253 | |
254 | #ifdef BIND_UPDATE |
255 | int |
256 | res_update(ns_updrec *rrecp_in) { |
257 | if (__res_maybe_init (&_res, 1) == -1) { |
258 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
259 | return (-1); |
260 | } |
261 | |
262 | return (res_nupdate(&_res, rrecp_in, NULL)); |
263 | } |
264 | #endif |
265 | |
266 | int |
267 | res_search(const char *name, /* domain name */ |
268 | int class, int type, /* class and type of query */ |
269 | u_char *answer, /* buffer to put answer */ |
270 | int anslen) /* size of answer */ |
271 | { |
272 | if (__res_maybe_init (&_res, 1) == -1) { |
273 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
274 | return (-1); |
275 | } |
276 | |
277 | return (res_nsearch(&_res, name, class, type, answer, anslen)); |
278 | } |
279 | |
280 | int |
281 | res_querydomain(const char *name, |
282 | const char *domain, |
283 | int class, int type, /* class and type of query */ |
284 | u_char *answer, /* buffer to put answer */ |
285 | int anslen) /* size of answer */ |
286 | { |
287 | if (__res_maybe_init (&_res, 1) == -1) { |
288 | RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); |
289 | return (-1); |
290 | } |
291 | |
292 | return (res_nquerydomain(&_res, name, domain, |
293 | class, type, |
294 | answer, anslen)); |
295 | } |
296 | |
297 | const char * |
298 | hostalias(const char *name) { |
299 | static char abuf[MAXDNAME]; |
300 | |
301 | return (res_hostalias(&_res, name, abuf, sizeof abuf)); |
302 | } |
303 | libresolv_hidden_def (hostalias) |
304 | |
305 | #ifdef ultrix |
306 | int |
307 | local_hostname_length(const char *hostname) { |
308 | int len_host, len_domain; |
309 | |
310 | if (!*_res.defdname) |
311 | res_init(); |
312 | len_host = strlen(hostname); |
313 | len_domain = strlen(_res.defdname); |
314 | if (len_host > len_domain && |
315 | !strcasecmp(hostname + len_host - len_domain, _res.defdname) && |
316 | hostname[len_host - len_domain - 1] == '.') |
317 | return (len_host - len_domain - 1); |
318 | return (0); |
319 | } |
320 | #endif /*ultrix*/ |
321 | |
322 | #endif |
323 | |
324 | |
325 | #include <shlib-compat.h> |
326 | |
327 | #if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2) |
328 | # undef res_mkquery |
329 | # undef res_query |
330 | # undef res_querydomain |
331 | # undef res_search |
332 | weak_alias (__res_mkquery, res_mkquery); |
333 | weak_alias (__res_query, res_query); |
334 | weak_alias (__res_querydomain, res_querydomain); |
335 | weak_alias (__res_search, res_search); |
336 | #endif |
337 | |