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Commit | Line | Data |
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28f540f4 | 1 | /* |
28f540f4 RM |
2 | * Copyright (c) 1985, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
e33b89df | 4 | * |
28f540f4 RM |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
28f540f4 RM |
13 | * 4. Neither the name of the University nor the names of its contributors |
14 | * may be used to endorse or promote products derived from this software | |
15 | * without specific prior written permission. | |
e33b89df | 16 | * |
28f540f4 RM |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
b43b13ac UD |
28 | */ |
29 | ||
30 | /* | |
28f540f4 | 31 | * Portions Copyright (c) 1993 by Digital Equipment Corporation. |
e33b89df | 32 | * |
28f540f4 RM |
33 | * Permission to use, copy, modify, and distribute this software for any |
34 | * purpose with or without fee is hereby granted, provided that the above | |
35 | * copyright notice and this permission notice appear in all copies, and that | |
36 | * the name of Digital Equipment Corporation not be used in advertising or | |
37 | * publicity pertaining to distribution of the document or software without | |
38 | * specific, written prior permission. | |
e33b89df | 39 | * |
28f540f4 RM |
40 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
41 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES | |
42 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT | |
43 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL | |
44 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR | |
45 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
46 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
47 | * SOFTWARE. | |
b43b13ac UD |
48 | */ |
49 | ||
50 | /* | |
51 | * Portions Copyright (c) 1996-1999 by Internet Software Consortium. | |
52 | * | |
53 | * Permission to use, copy, modify, and distribute this software for any | |
54 | * purpose with or without fee is hereby granted, provided that the above | |
55 | * copyright notice and this permission notice appear in all copies. | |
56 | * | |
57 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS | |
58 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES | |
59 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE | |
60 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL | |
61 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR | |
62 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
63 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
64 | * SOFTWARE. | |
28f540f4 RM |
65 | */ |
66 | ||
df21c858 | 67 | #include <sys/types.h> |
28f540f4 RM |
68 | #include <sys/param.h> |
69 | #include <netinet/in.h> | |
70 | #include <arpa/nameser.h> | |
3d61b63c | 71 | #include <netdb.h> |
28f540f4 | 72 | #include <resolv.h> |
b43b13ac UD |
73 | #include <stdio.h> |
74 | #include <string.h> | |
f890a59b | 75 | #include <sys/time.h> |
28f540f4 | 76 | |
b43b13ac UD |
77 | /* Options. Leave them on. */ |
78 | /* #define DEBUG */ | |
79 | ||
e33b89df | 80 | # include <hp-timing.h> |
e054f494 | 81 | # include <stdint.h> |
e33b89df UD |
82 | # if HP_TIMING_AVAIL |
83 | # define RANDOM_BITS(Var) { uint64_t v64; HP_TIMING_NOW (v64); Var = v64; } | |
84 | # endif | |
e33b89df | 85 | |
28f540f4 RM |
86 | /* |
87 | * Form all types of queries. | |
88 | * Returns the size of the result or -1. | |
89 | */ | |
90 | int | |
b43b13ac UD |
91 | res_nmkquery(res_state statp, |
92 | int op, /* opcode of query */ | |
93 | const char *dname, /* domain name */ | |
94 | int class, int type, /* class and type of query */ | |
95 | const u_char *data, /* resource record data */ | |
96 | int datalen, /* length of data */ | |
97 | const u_char *newrr_in, /* new rr for modify or append */ | |
98 | u_char *buf, /* buffer to put query */ | |
99 | int buflen) /* size of buffer */ | |
28f540f4 | 100 | { |
2e09a79a JM |
101 | HEADER *hp; |
102 | u_char *cp; | |
103 | int n; | |
28f540f4 RM |
104 | u_char *dnptrs[20], **dpp, **lastdnptr; |
105 | ||
106 | #ifdef DEBUG | |
b43b13ac UD |
107 | if (statp->options & RES_DEBUG) |
108 | printf(";; res_nmkquery(%s, %s, %s, %s)\n", | |
109 | _res_opcodes[op], dname, p_class(class), p_type(type)); | |
28f540f4 | 110 | #endif |
28f540f4 RM |
111 | /* |
112 | * Initialize header fields. | |
113 | */ | |
114 | if ((buf == NULL) || (buflen < HFIXEDSZ)) | |
115 | return (-1); | |
b43b13ac | 116 | memset(buf, 0, HFIXEDSZ); |
28f540f4 | 117 | hp = (HEADER *) buf; |
e33b89df UD |
118 | /* We randomize the IDs every time. The old code just |
119 | incremented by one after the initial randomization which | |
120 | still predictable if the application does multiple | |
121 | requests. */ | |
e33b89df UD |
122 | int randombits; |
123 | do | |
124 | { | |
03eeff83 | 125 | #ifdef RANDOM_BITS |
e33b89df | 126 | RANDOM_BITS (randombits); |
03eeff83 | 127 | #else |
e33b89df UD |
128 | struct timeval tv; |
129 | __gettimeofday (&tv, NULL); | |
29e11320 | 130 | randombits = (tv.tv_sec << 8) ^ tv.tv_usec; |
03eeff83 | 131 | #endif |
e33b89df | 132 | } |
3feb8efa | 133 | while ((randombits & 0xffff) == 0); |
e33b89df | 134 | statp->id = (statp->id + randombits) & 0xffff; |
03eeff83 | 135 | hp->id = statp->id; |
28f540f4 | 136 | hp->opcode = op; |
b43b13ac | 137 | hp->rd = (statp->options & RES_RECURSE) != 0; |
28f540f4 RM |
138 | hp->rcode = NOERROR; |
139 | cp = buf + HFIXEDSZ; | |
140 | buflen -= HFIXEDSZ; | |
141 | dpp = dnptrs; | |
142 | *dpp++ = buf; | |
143 | *dpp++ = NULL; | |
144 | lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; | |
145 | /* | |
146 | * perform opcode specific processing | |
147 | */ | |
148 | switch (op) { | |
28f540f4 | 149 | case NS_NOTIFY_OP: |
bce16467 UD |
150 | if ((buflen -= QFIXEDSZ + (data == NULL ? 0 : RRFIXEDSZ)) < 0) |
151 | return (-1); | |
152 | goto compose; | |
153 | ||
154 | case QUERY: | |
28f540f4 RM |
155 | if ((buflen -= QFIXEDSZ) < 0) |
156 | return (-1); | |
bce16467 | 157 | compose: |
be1c55f2 UD |
158 | n = ns_name_compress(dname, cp, buflen, |
159 | (const u_char **) dnptrs, | |
160 | (const u_char **) lastdnptr); | |
161 | if (n < 0) | |
28f540f4 RM |
162 | return (-1); |
163 | cp += n; | |
164 | buflen -= n; | |
bce16467 UD |
165 | NS_PUT16 (type, cp); |
166 | NS_PUT16 (class, cp); | |
28f540f4 RM |
167 | hp->qdcount = htons(1); |
168 | if (op == QUERY || data == NULL) | |
169 | break; | |
170 | /* | |
171 | * Make an additional record for completion domain. | |
172 | */ | |
be1c55f2 UD |
173 | n = ns_name_compress((char *)data, cp, buflen, |
174 | (const u_char **) dnptrs, | |
175 | (const u_char **) lastdnptr); | |
a1ffb40e | 176 | if (__glibc_unlikely (n < 0)) |
28f540f4 RM |
177 | return (-1); |
178 | cp += n; | |
179 | buflen -= n; | |
bce16467 UD |
180 | NS_PUT16 (T_NULL, cp); |
181 | NS_PUT16 (class, cp); | |
182 | NS_PUT32 (0, cp); | |
183 | NS_PUT16 (0, cp); | |
28f540f4 RM |
184 | hp->arcount = htons(1); |
185 | break; | |
186 | ||
187 | case IQUERY: | |
188 | /* | |
189 | * Initialize answer section | |
190 | */ | |
a1ffb40e | 191 | if (__glibc_unlikely (buflen < 1 + RRFIXEDSZ + datalen)) |
28f540f4 RM |
192 | return (-1); |
193 | *cp++ = '\0'; /* no domain name */ | |
bce16467 UD |
194 | NS_PUT16 (type, cp); |
195 | NS_PUT16 (class, cp); | |
196 | NS_PUT32 (0, cp); | |
197 | NS_PUT16 (datalen, cp); | |
28f540f4 | 198 | if (datalen) { |
b43b13ac | 199 | memcpy(cp, data, datalen); |
28f540f4 RM |
200 | cp += datalen; |
201 | } | |
202 | hp->ancount = htons(1); | |
203 | break; | |
204 | ||
28f540f4 RM |
205 | default: |
206 | return (-1); | |
207 | } | |
208 | return (cp - buf); | |
209 | } | |
6f9d8e68 | 210 | libresolv_hidden_def (res_nmkquery) |
2bbb7d5b UD |
211 | |
212 | ||
213 | /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ | |
214 | #ifndef T_OPT | |
215 | #define T_OPT 41 | |
216 | #endif | |
217 | ||
218 | int | |
219 | __res_nopt(res_state statp, | |
220 | int n0, /* current offset in buffer */ | |
221 | u_char *buf, /* buffer to put query */ | |
222 | int buflen, /* size of buffer */ | |
223 | int anslen) /* UDP answer buffer size */ | |
224 | { | |
225 | u_int16_t flags = 0; | |
226 | ||
227 | #ifdef DEBUG | |
228 | if ((statp->options & RES_DEBUG) != 0U) | |
229 | printf(";; res_nopt()\n"); | |
230 | #endif | |
231 | ||
232 | HEADER *hp = (HEADER *) buf; | |
233 | u_char *cp = buf + n0; | |
234 | u_char *ep = buf + buflen; | |
235 | ||
236 | if ((ep - cp) < 1 + RRFIXEDSZ) | |
237 | return -1; | |
238 | ||
239 | *cp++ = 0; /* "." */ | |
240 | ||
0073dd2d | 241 | NS_PUT16(T_OPT, cp); /* TYPE */ |
1c0ab5bd | 242 | NS_PUT16(MIN(anslen, 0xffff), cp); /* CLASS = UDP payload size */ |
2bbb7d5b UD |
243 | *cp++ = NOERROR; /* extended RCODE */ |
244 | *cp++ = 0; /* EDNS version */ | |
2d0671cb AT |
245 | |
246 | if (statp->options & RES_USE_DNSSEC) { | |
247 | #ifdef DEBUG | |
248 | if (statp->options & RES_DEBUG) | |
249 | printf(";; res_opt()... ENDS0 DNSSEC\n"); | |
250 | #endif | |
251 | flags |= NS_OPT_DNSSEC_OK; | |
252 | } | |
253 | ||
0073dd2d UD |
254 | NS_PUT16(flags, cp); |
255 | NS_PUT16(0, cp); /* RDLEN */ | |
2bbb7d5b UD |
256 | hp->arcount = htons(ntohs(hp->arcount) + 1); |
257 | ||
258 | return cp - buf; | |
259 | } | |
260 | libresolv_hidden_def (__res_nopt) |