1*9525b14bSRao Shoaib /*
2*9525b14bSRao Shoaib * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
3*9525b14bSRao Shoaib * Use is subject to license terms.
4*9525b14bSRao Shoaib */
5*9525b14bSRao Shoaib
6*9525b14bSRao Shoaib
7*9525b14bSRao Shoaib /*
8*9525b14bSRao Shoaib * Copyright (C) 2009 Internet Systems Consortium, Inc. ("ISC")
9*9525b14bSRao Shoaib *
10*9525b14bSRao Shoaib * Permission to use, copy, modify, and/or distribute this software for any
11*9525b14bSRao Shoaib * purpose with or without fee is hereby granted, provided that the above
12*9525b14bSRao Shoaib * copyright notice and this permission notice appear in all copies.
13*9525b14bSRao Shoaib *
14*9525b14bSRao Shoaib * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
15*9525b14bSRao Shoaib * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
16*9525b14bSRao Shoaib * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
17*9525b14bSRao Shoaib * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
18*9525b14bSRao Shoaib * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
19*9525b14bSRao Shoaib * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
20*9525b14bSRao Shoaib * PERFORMANCE OF THIS SOFTWARE.
21*9525b14bSRao Shoaib */
22*9525b14bSRao Shoaib
23*9525b14bSRao Shoaib #include "port_before.h"
24*9525b14bSRao Shoaib
25*9525b14bSRao Shoaib #if __OpenBSD__
26*9525b14bSRao Shoaib #include <sys/types.h>
27*9525b14bSRao Shoaib #endif
28*9525b14bSRao Shoaib #include <netinet/in.h>
29*9525b14bSRao Shoaib #include <arpa/nameser.h>
30*9525b14bSRao Shoaib
31*9525b14bSRao Shoaib #include <errno.h>
32*9525b14bSRao Shoaib #include <resolv.h>
33*9525b14bSRao Shoaib #include <string.h>
34*9525b14bSRao Shoaib
35*9525b14bSRao Shoaib #include "port_after.h"
36*9525b14bSRao Shoaib
37*9525b14bSRao Shoaib #define CONSUME_SRC \
38*9525b14bSRao Shoaib do { \
39*9525b14bSRao Shoaib rdata += n, rdlen -= n; \
40*9525b14bSRao Shoaib } while (0)
41*9525b14bSRao Shoaib
42*9525b14bSRao Shoaib #define CONSUME_DST \
43*9525b14bSRao Shoaib do { \
44*9525b14bSRao Shoaib nrdata += n, nrdsiz -= n, nrdlen += n; \
45*9525b14bSRao Shoaib } while (0)
46*9525b14bSRao Shoaib
47*9525b14bSRao Shoaib #define UNPACK_DNAME \
48*9525b14bSRao Shoaib do { \
49*9525b14bSRao Shoaib size_t t; \
50*9525b14bSRao Shoaib \
51*9525b14bSRao Shoaib if ((n = ns_name_unpack2(msg,eom,rdata,nrdata,nrdsiz,&t))<0) {\
52*9525b14bSRao Shoaib errno = EMSGSIZE; \
53*9525b14bSRao Shoaib return (-1); \
54*9525b14bSRao Shoaib } \
55*9525b14bSRao Shoaib CONSUME_SRC; \
56*9525b14bSRao Shoaib n = t; \
57*9525b14bSRao Shoaib CONSUME_DST; \
58*9525b14bSRao Shoaib } while (0)
59*9525b14bSRao Shoaib
60*9525b14bSRao Shoaib #define UNPACK_SOME(x) \
61*9525b14bSRao Shoaib do { \
62*9525b14bSRao Shoaib n = (x); \
63*9525b14bSRao Shoaib if ((size_t)n > rdlen || (size_t)n > nrdsiz) { \
64*9525b14bSRao Shoaib errno = EMSGSIZE; \
65*9525b14bSRao Shoaib return (-1); \
66*9525b14bSRao Shoaib } \
67*9525b14bSRao Shoaib memcpy(nrdata, rdata, n); \
68*9525b14bSRao Shoaib CONSUME_SRC; CONSUME_DST; \
69*9525b14bSRao Shoaib } while (0)
70*9525b14bSRao Shoaib
71*9525b14bSRao Shoaib #define UNPACK_REST(x) \
72*9525b14bSRao Shoaib do { \
73*9525b14bSRao Shoaib n = (x); \
74*9525b14bSRao Shoaib if ((size_t)n != rdlen) { \
75*9525b14bSRao Shoaib errno = EMSGSIZE; \
76*9525b14bSRao Shoaib return (-1); \
77*9525b14bSRao Shoaib } \
78*9525b14bSRao Shoaib memcpy(nrdata, rdata, n); \
79*9525b14bSRao Shoaib CONSUME_SRC; CONSUME_DST; \
80*9525b14bSRao Shoaib } while (0)
81*9525b14bSRao Shoaib
82*9525b14bSRao Shoaib ssize_t
ns_rdata_unpack(const u_char * msg,const u_char * eom,ns_type type,const u_char * rdata,size_t rdlen,u_char * nrdata,size_t nrdsiz)83*9525b14bSRao Shoaib ns_rdata_unpack(const u_char *msg, const u_char *eom,
84*9525b14bSRao Shoaib ns_type type, const u_char *rdata, size_t rdlen,
85*9525b14bSRao Shoaib u_char *nrdata, size_t nrdsiz)
86*9525b14bSRao Shoaib {
87*9525b14bSRao Shoaib size_t nrdlen = 0;
88*9525b14bSRao Shoaib int n;
89*9525b14bSRao Shoaib
90*9525b14bSRao Shoaib switch (type) {
91*9525b14bSRao Shoaib case ns_t_a:
92*9525b14bSRao Shoaib UNPACK_REST(NS_INADDRSZ);
93*9525b14bSRao Shoaib break;
94*9525b14bSRao Shoaib case ns_t_aaaa:
95*9525b14bSRao Shoaib UNPACK_REST(NS_IN6ADDRSZ);
96*9525b14bSRao Shoaib break;
97*9525b14bSRao Shoaib case ns_t_cname:
98*9525b14bSRao Shoaib case ns_t_mb:
99*9525b14bSRao Shoaib case ns_t_mg:
100*9525b14bSRao Shoaib case ns_t_mr:
101*9525b14bSRao Shoaib case ns_t_ns:
102*9525b14bSRao Shoaib case ns_t_ptr:
103*9525b14bSRao Shoaib case ns_t_dname:
104*9525b14bSRao Shoaib UNPACK_DNAME;
105*9525b14bSRao Shoaib break;
106*9525b14bSRao Shoaib case ns_t_soa:
107*9525b14bSRao Shoaib UNPACK_DNAME;
108*9525b14bSRao Shoaib UNPACK_DNAME;
109*9525b14bSRao Shoaib UNPACK_SOME(NS_INT32SZ * 5);
110*9525b14bSRao Shoaib break;
111*9525b14bSRao Shoaib case ns_t_mx:
112*9525b14bSRao Shoaib case ns_t_afsdb:
113*9525b14bSRao Shoaib case ns_t_rt:
114*9525b14bSRao Shoaib UNPACK_SOME(NS_INT16SZ);
115*9525b14bSRao Shoaib UNPACK_DNAME;
116*9525b14bSRao Shoaib break;
117*9525b14bSRao Shoaib case ns_t_px:
118*9525b14bSRao Shoaib UNPACK_SOME(NS_INT16SZ);
119*9525b14bSRao Shoaib UNPACK_DNAME;
120*9525b14bSRao Shoaib UNPACK_DNAME;
121*9525b14bSRao Shoaib break;
122*9525b14bSRao Shoaib case ns_t_srv:
123*9525b14bSRao Shoaib UNPACK_SOME(NS_INT16SZ * 3);
124*9525b14bSRao Shoaib UNPACK_DNAME;
125*9525b14bSRao Shoaib break;
126*9525b14bSRao Shoaib case ns_t_minfo:
127*9525b14bSRao Shoaib case ns_t_rp:
128*9525b14bSRao Shoaib UNPACK_DNAME;
129*9525b14bSRao Shoaib UNPACK_DNAME;
130*9525b14bSRao Shoaib break;
131*9525b14bSRao Shoaib default:
132*9525b14bSRao Shoaib UNPACK_SOME(rdlen);
133*9525b14bSRao Shoaib break;
134*9525b14bSRao Shoaib }
135*9525b14bSRao Shoaib if (rdlen > 0) {
136*9525b14bSRao Shoaib errno = EMSGSIZE;
137*9525b14bSRao Shoaib return (-1);
138*9525b14bSRao Shoaib }
139*9525b14bSRao Shoaib return (nrdlen);
140*9525b14bSRao Shoaib }
141*9525b14bSRao Shoaib
142*9525b14bSRao Shoaib #define EQUAL_CONSUME \
143*9525b14bSRao Shoaib do { \
144*9525b14bSRao Shoaib rdata1 += n, rdlen1 -= n; \
145*9525b14bSRao Shoaib rdata2 += n, rdlen2 -= n; \
146*9525b14bSRao Shoaib } while (0)
147*9525b14bSRao Shoaib
148*9525b14bSRao Shoaib #define EQUAL_DNAME \
149*9525b14bSRao Shoaib do { \
150*9525b14bSRao Shoaib ssize_t n; \
151*9525b14bSRao Shoaib \
152*9525b14bSRao Shoaib if (rdlen1 != rdlen2) \
153*9525b14bSRao Shoaib return (0); \
154*9525b14bSRao Shoaib n = ns_name_eq(rdata1, rdlen1, rdata2, rdlen2); \
155*9525b14bSRao Shoaib if (n <= 0) \
156*9525b14bSRao Shoaib return (n); \
157*9525b14bSRao Shoaib n = rdlen1; \
158*9525b14bSRao Shoaib EQUAL_CONSUME; \
159*9525b14bSRao Shoaib } while (0)
160*9525b14bSRao Shoaib
161*9525b14bSRao Shoaib #define EQUAL_SOME(x) \
162*9525b14bSRao Shoaib do { \
163*9525b14bSRao Shoaib size_t n = (x); \
164*9525b14bSRao Shoaib \
165*9525b14bSRao Shoaib if (n > rdlen1 || n > rdlen2) { \
166*9525b14bSRao Shoaib errno = EMSGSIZE; \
167*9525b14bSRao Shoaib return (-1); \
168*9525b14bSRao Shoaib } \
169*9525b14bSRao Shoaib if (memcmp(rdata1, rdata2, n) != 0) \
170*9525b14bSRao Shoaib return (0); \
171*9525b14bSRao Shoaib EQUAL_CONSUME; \
172*9525b14bSRao Shoaib } while (0)
173*9525b14bSRao Shoaib
174*9525b14bSRao Shoaib int
ns_rdata_equal(ns_type type,const u_char * rdata1,size_t rdlen1,const u_char * rdata2,size_t rdlen2)175*9525b14bSRao Shoaib ns_rdata_equal(ns_type type,
176*9525b14bSRao Shoaib const u_char *rdata1, size_t rdlen1,
177*9525b14bSRao Shoaib const u_char *rdata2, size_t rdlen2)
178*9525b14bSRao Shoaib {
179*9525b14bSRao Shoaib switch (type) {
180*9525b14bSRao Shoaib case ns_t_cname:
181*9525b14bSRao Shoaib case ns_t_mb:
182*9525b14bSRao Shoaib case ns_t_mg:
183*9525b14bSRao Shoaib case ns_t_mr:
184*9525b14bSRao Shoaib case ns_t_ns:
185*9525b14bSRao Shoaib case ns_t_ptr:
186*9525b14bSRao Shoaib case ns_t_dname:
187*9525b14bSRao Shoaib EQUAL_DNAME;
188*9525b14bSRao Shoaib break;
189*9525b14bSRao Shoaib case ns_t_soa:
190*9525b14bSRao Shoaib /* "There can be only one." --Highlander */
191*9525b14bSRao Shoaib break;
192*9525b14bSRao Shoaib case ns_t_mx:
193*9525b14bSRao Shoaib case ns_t_afsdb:
194*9525b14bSRao Shoaib case ns_t_rt:
195*9525b14bSRao Shoaib EQUAL_SOME(NS_INT16SZ);
196*9525b14bSRao Shoaib EQUAL_DNAME;
197*9525b14bSRao Shoaib break;
198*9525b14bSRao Shoaib case ns_t_px:
199*9525b14bSRao Shoaib EQUAL_SOME(NS_INT16SZ);
200*9525b14bSRao Shoaib EQUAL_DNAME;
201*9525b14bSRao Shoaib EQUAL_DNAME;
202*9525b14bSRao Shoaib break;
203*9525b14bSRao Shoaib case ns_t_srv:
204*9525b14bSRao Shoaib EQUAL_SOME(NS_INT16SZ * 3);
205*9525b14bSRao Shoaib EQUAL_DNAME;
206*9525b14bSRao Shoaib break;
207*9525b14bSRao Shoaib case ns_t_minfo:
208*9525b14bSRao Shoaib case ns_t_rp:
209*9525b14bSRao Shoaib EQUAL_DNAME;
210*9525b14bSRao Shoaib EQUAL_DNAME;
211*9525b14bSRao Shoaib break;
212*9525b14bSRao Shoaib default:
213*9525b14bSRao Shoaib EQUAL_SOME(rdlen1);
214*9525b14bSRao Shoaib break;
215*9525b14bSRao Shoaib }
216*9525b14bSRao Shoaib if (rdlen1 != 0 || rdlen2 != 0)
217*9525b14bSRao Shoaib return (0);
218*9525b14bSRao Shoaib return (1);
219*9525b14bSRao Shoaib }
220*9525b14bSRao Shoaib
221*9525b14bSRao Shoaib #define REFERS_DNAME \
222*9525b14bSRao Shoaib do { \
223*9525b14bSRao Shoaib int n; \
224*9525b14bSRao Shoaib \
225*9525b14bSRao Shoaib n = ns_name_eq(rdata, rdlen, nname, NS_MAXNNAME); \
226*9525b14bSRao Shoaib if (n < 0) \
227*9525b14bSRao Shoaib return (-1); \
228*9525b14bSRao Shoaib if (n > 0) \
229*9525b14bSRao Shoaib return (1); \
230*9525b14bSRao Shoaib n = dn_skipname(rdata, rdata + rdlen); \
231*9525b14bSRao Shoaib if (n < 0) \
232*9525b14bSRao Shoaib return (-1); \
233*9525b14bSRao Shoaib CONSUME_SRC; \
234*9525b14bSRao Shoaib } while (0)
235*9525b14bSRao Shoaib
236*9525b14bSRao Shoaib #define REFERS_SOME(x) \
237*9525b14bSRao Shoaib do { \
238*9525b14bSRao Shoaib size_t n = (x); \
239*9525b14bSRao Shoaib \
240*9525b14bSRao Shoaib if (n > rdlen) { \
241*9525b14bSRao Shoaib errno = EMSGSIZE; \
242*9525b14bSRao Shoaib return (-1); \
243*9525b14bSRao Shoaib } \
244*9525b14bSRao Shoaib CONSUME_SRC; \
245*9525b14bSRao Shoaib } while (0)
246*9525b14bSRao Shoaib
247*9525b14bSRao Shoaib int
ns_rdata_refers(ns_type type,const u_char * rdata,size_t rdlen,const u_char * nname)248*9525b14bSRao Shoaib ns_rdata_refers(ns_type type,
249*9525b14bSRao Shoaib const u_char *rdata, size_t rdlen,
250*9525b14bSRao Shoaib const u_char *nname)
251*9525b14bSRao Shoaib {
252*9525b14bSRao Shoaib switch (type) {
253*9525b14bSRao Shoaib case ns_t_cname:
254*9525b14bSRao Shoaib case ns_t_mb:
255*9525b14bSRao Shoaib case ns_t_mg:
256*9525b14bSRao Shoaib case ns_t_mr:
257*9525b14bSRao Shoaib case ns_t_ns:
258*9525b14bSRao Shoaib case ns_t_ptr:
259*9525b14bSRao Shoaib case ns_t_dname:
260*9525b14bSRao Shoaib REFERS_DNAME;
261*9525b14bSRao Shoaib break;
262*9525b14bSRao Shoaib case ns_t_soa:
263*9525b14bSRao Shoaib REFERS_DNAME;
264*9525b14bSRao Shoaib REFERS_DNAME;
265*9525b14bSRao Shoaib REFERS_SOME(NS_INT32SZ * 5);
266*9525b14bSRao Shoaib break;
267*9525b14bSRao Shoaib case ns_t_mx:
268*9525b14bSRao Shoaib case ns_t_afsdb:
269*9525b14bSRao Shoaib case ns_t_rt:
270*9525b14bSRao Shoaib REFERS_SOME(NS_INT16SZ);
271*9525b14bSRao Shoaib REFERS_DNAME;
272*9525b14bSRao Shoaib break;
273*9525b14bSRao Shoaib case ns_t_px:
274*9525b14bSRao Shoaib REFERS_SOME(NS_INT16SZ);
275*9525b14bSRao Shoaib REFERS_DNAME;
276*9525b14bSRao Shoaib REFERS_DNAME;
277*9525b14bSRao Shoaib break;
278*9525b14bSRao Shoaib case ns_t_srv:
279*9525b14bSRao Shoaib REFERS_SOME(NS_INT16SZ * 3);
280*9525b14bSRao Shoaib REFERS_DNAME;
281*9525b14bSRao Shoaib break;
282*9525b14bSRao Shoaib case ns_t_minfo:
283*9525b14bSRao Shoaib case ns_t_rp:
284*9525b14bSRao Shoaib REFERS_DNAME;
285*9525b14bSRao Shoaib REFERS_DNAME;
286*9525b14bSRao Shoaib break;
287*9525b14bSRao Shoaib default:
288*9525b14bSRao Shoaib REFERS_SOME(rdlen);
289*9525b14bSRao Shoaib break;
290*9525b14bSRao Shoaib }
291*9525b14bSRao Shoaib if (rdlen != 0) {
292*9525b14bSRao Shoaib errno = EMSGSIZE;
293*9525b14bSRao Shoaib return (-1);
294*9525b14bSRao Shoaib }
295*9525b14bSRao Shoaib return (0);
296*9525b14bSRao Shoaib }
297