xref: /onnv-gate/usr/src/lib/libresolv2/common/nameser/ns_rdata.c (revision 11038:74b12212b8a2)
1*11038SRao.Shoaib@Sun.COM /*
2*11038SRao.Shoaib@Sun.COM  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
3*11038SRao.Shoaib@Sun.COM  * Use is subject to license terms.
4*11038SRao.Shoaib@Sun.COM  */
5*11038SRao.Shoaib@Sun.COM 
6*11038SRao.Shoaib@Sun.COM 
7*11038SRao.Shoaib@Sun.COM /*
8*11038SRao.Shoaib@Sun.COM  * Copyright (C) 2009  Internet Systems Consortium, Inc. ("ISC")
9*11038SRao.Shoaib@Sun.COM  *
10*11038SRao.Shoaib@Sun.COM  * Permission to use, copy, modify, and/or distribute this software for any
11*11038SRao.Shoaib@Sun.COM  * purpose with or without fee is hereby granted, provided that the above
12*11038SRao.Shoaib@Sun.COM  * copyright notice and this permission notice appear in all copies.
13*11038SRao.Shoaib@Sun.COM  *
14*11038SRao.Shoaib@Sun.COM  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
15*11038SRao.Shoaib@Sun.COM  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
16*11038SRao.Shoaib@Sun.COM  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
17*11038SRao.Shoaib@Sun.COM  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
18*11038SRao.Shoaib@Sun.COM  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
19*11038SRao.Shoaib@Sun.COM  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
20*11038SRao.Shoaib@Sun.COM  * PERFORMANCE OF THIS SOFTWARE.
21*11038SRao.Shoaib@Sun.COM  */
22*11038SRao.Shoaib@Sun.COM 
23*11038SRao.Shoaib@Sun.COM #ifndef lint
24*11038SRao.Shoaib@Sun.COM static const char rcsid[] = "$Id: ns_rdata.c,v 1.2 2009/01/23 23:49:15 tbox Exp $";
25*11038SRao.Shoaib@Sun.COM #endif
26*11038SRao.Shoaib@Sun.COM 
27*11038SRao.Shoaib@Sun.COM #include "port_before.h"
28*11038SRao.Shoaib@Sun.COM 
29*11038SRao.Shoaib@Sun.COM #if __OpenBSD__
30*11038SRao.Shoaib@Sun.COM #include <sys/types.h>
31*11038SRao.Shoaib@Sun.COM #endif
32*11038SRao.Shoaib@Sun.COM #include <netinet/in.h>
33*11038SRao.Shoaib@Sun.COM #include <arpa/nameser.h>
34*11038SRao.Shoaib@Sun.COM 
35*11038SRao.Shoaib@Sun.COM #include <errno.h>
36*11038SRao.Shoaib@Sun.COM #include <resolv.h>
37*11038SRao.Shoaib@Sun.COM #include <string.h>
38*11038SRao.Shoaib@Sun.COM 
39*11038SRao.Shoaib@Sun.COM #include "port_after.h"
40*11038SRao.Shoaib@Sun.COM 
41*11038SRao.Shoaib@Sun.COM #define CONSUME_SRC \
42*11038SRao.Shoaib@Sun.COM 	do { \
43*11038SRao.Shoaib@Sun.COM 		rdata += n, rdlen -= n; \
44*11038SRao.Shoaib@Sun.COM 	} while (0)
45*11038SRao.Shoaib@Sun.COM 
46*11038SRao.Shoaib@Sun.COM #define CONSUME_DST \
47*11038SRao.Shoaib@Sun.COM 	do { \
48*11038SRao.Shoaib@Sun.COM 		nrdata += n, nrdsiz -= n, nrdlen += n; \
49*11038SRao.Shoaib@Sun.COM 	} while (0)
50*11038SRao.Shoaib@Sun.COM 
51*11038SRao.Shoaib@Sun.COM #define UNPACK_DNAME \
52*11038SRao.Shoaib@Sun.COM 	do { \
53*11038SRao.Shoaib@Sun.COM 		size_t t; \
54*11038SRao.Shoaib@Sun.COM 		\
55*11038SRao.Shoaib@Sun.COM 		if ((n = ns_name_unpack2(msg,eom,rdata,nrdata,nrdsiz,&t))<0) {\
56*11038SRao.Shoaib@Sun.COM 			errno = EMSGSIZE; \
57*11038SRao.Shoaib@Sun.COM 			return (-1); \
58*11038SRao.Shoaib@Sun.COM 		} \
59*11038SRao.Shoaib@Sun.COM 		CONSUME_SRC; \
60*11038SRao.Shoaib@Sun.COM 		n = t; \
61*11038SRao.Shoaib@Sun.COM 		CONSUME_DST; \
62*11038SRao.Shoaib@Sun.COM 	} while (0)
63*11038SRao.Shoaib@Sun.COM 
64*11038SRao.Shoaib@Sun.COM #define UNPACK_SOME(x) \
65*11038SRao.Shoaib@Sun.COM 	do { \
66*11038SRao.Shoaib@Sun.COM 		n = (x); \
67*11038SRao.Shoaib@Sun.COM 		if ((size_t)n > rdlen || (size_t)n > nrdsiz) { \
68*11038SRao.Shoaib@Sun.COM 			errno = EMSGSIZE; \
69*11038SRao.Shoaib@Sun.COM 			return (-1); \
70*11038SRao.Shoaib@Sun.COM 		} \
71*11038SRao.Shoaib@Sun.COM 		memcpy(nrdata, rdata, n); \
72*11038SRao.Shoaib@Sun.COM 		CONSUME_SRC; CONSUME_DST; \
73*11038SRao.Shoaib@Sun.COM 	} while (0)
74*11038SRao.Shoaib@Sun.COM 
75*11038SRao.Shoaib@Sun.COM #define	UNPACK_REST(x) \
76*11038SRao.Shoaib@Sun.COM 	do { \
77*11038SRao.Shoaib@Sun.COM 		n = (x); \
78*11038SRao.Shoaib@Sun.COM 		if ((size_t)n != rdlen) { \
79*11038SRao.Shoaib@Sun.COM 			errno = EMSGSIZE; \
80*11038SRao.Shoaib@Sun.COM 			return (-1); \
81*11038SRao.Shoaib@Sun.COM 		} \
82*11038SRao.Shoaib@Sun.COM 		memcpy(nrdata, rdata, n); \
83*11038SRao.Shoaib@Sun.COM 		CONSUME_SRC; CONSUME_DST; \
84*11038SRao.Shoaib@Sun.COM 	} while (0)
85*11038SRao.Shoaib@Sun.COM 
86*11038SRao.Shoaib@Sun.COM 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)87*11038SRao.Shoaib@Sun.COM ns_rdata_unpack(const u_char *msg, const u_char *eom,
88*11038SRao.Shoaib@Sun.COM 		ns_type type, const u_char *rdata, size_t rdlen,
89*11038SRao.Shoaib@Sun.COM 		u_char *nrdata, size_t nrdsiz)
90*11038SRao.Shoaib@Sun.COM {
91*11038SRao.Shoaib@Sun.COM 	size_t nrdlen = 0;
92*11038SRao.Shoaib@Sun.COM 	int n;
93*11038SRao.Shoaib@Sun.COM 
94*11038SRao.Shoaib@Sun.COM 	switch (type) {
95*11038SRao.Shoaib@Sun.COM 	case ns_t_a:
96*11038SRao.Shoaib@Sun.COM 		UNPACK_REST(NS_INADDRSZ);
97*11038SRao.Shoaib@Sun.COM 		break;
98*11038SRao.Shoaib@Sun.COM 	case ns_t_aaaa:
99*11038SRao.Shoaib@Sun.COM 		UNPACK_REST(NS_IN6ADDRSZ);
100*11038SRao.Shoaib@Sun.COM 		break;
101*11038SRao.Shoaib@Sun.COM 	case ns_t_cname:
102*11038SRao.Shoaib@Sun.COM 	case ns_t_mb:
103*11038SRao.Shoaib@Sun.COM 	case ns_t_mg:
104*11038SRao.Shoaib@Sun.COM 	case ns_t_mr:
105*11038SRao.Shoaib@Sun.COM 	case ns_t_ns:
106*11038SRao.Shoaib@Sun.COM 	case ns_t_ptr:
107*11038SRao.Shoaib@Sun.COM 	case ns_t_dname:
108*11038SRao.Shoaib@Sun.COM 		UNPACK_DNAME;
109*11038SRao.Shoaib@Sun.COM 		break;
110*11038SRao.Shoaib@Sun.COM 	case ns_t_soa:
111*11038SRao.Shoaib@Sun.COM 		UNPACK_DNAME;
112*11038SRao.Shoaib@Sun.COM 		UNPACK_DNAME;
113*11038SRao.Shoaib@Sun.COM 		UNPACK_SOME(NS_INT32SZ * 5);
114*11038SRao.Shoaib@Sun.COM 		break;
115*11038SRao.Shoaib@Sun.COM 	case ns_t_mx:
116*11038SRao.Shoaib@Sun.COM 	case ns_t_afsdb:
117*11038SRao.Shoaib@Sun.COM 	case ns_t_rt:
118*11038SRao.Shoaib@Sun.COM 		UNPACK_SOME(NS_INT16SZ);
119*11038SRao.Shoaib@Sun.COM 		UNPACK_DNAME;
120*11038SRao.Shoaib@Sun.COM 		break;
121*11038SRao.Shoaib@Sun.COM 	case ns_t_px:
122*11038SRao.Shoaib@Sun.COM 		UNPACK_SOME(NS_INT16SZ);
123*11038SRao.Shoaib@Sun.COM 		UNPACK_DNAME;
124*11038SRao.Shoaib@Sun.COM 		UNPACK_DNAME;
125*11038SRao.Shoaib@Sun.COM 		break;
126*11038SRao.Shoaib@Sun.COM 	case ns_t_srv:
127*11038SRao.Shoaib@Sun.COM 		UNPACK_SOME(NS_INT16SZ * 3);
128*11038SRao.Shoaib@Sun.COM 		UNPACK_DNAME;
129*11038SRao.Shoaib@Sun.COM 		break;
130*11038SRao.Shoaib@Sun.COM 	case ns_t_minfo:
131*11038SRao.Shoaib@Sun.COM 	case ns_t_rp:
132*11038SRao.Shoaib@Sun.COM 		UNPACK_DNAME;
133*11038SRao.Shoaib@Sun.COM 		UNPACK_DNAME;
134*11038SRao.Shoaib@Sun.COM 		break;
135*11038SRao.Shoaib@Sun.COM 	default:
136*11038SRao.Shoaib@Sun.COM 		UNPACK_SOME(rdlen);
137*11038SRao.Shoaib@Sun.COM 		break;
138*11038SRao.Shoaib@Sun.COM 	}
139*11038SRao.Shoaib@Sun.COM 	if (rdlen > 0) {
140*11038SRao.Shoaib@Sun.COM 		errno = EMSGSIZE;
141*11038SRao.Shoaib@Sun.COM 		return (-1);
142*11038SRao.Shoaib@Sun.COM 	}
143*11038SRao.Shoaib@Sun.COM 	return (nrdlen);
144*11038SRao.Shoaib@Sun.COM }
145*11038SRao.Shoaib@Sun.COM 
146*11038SRao.Shoaib@Sun.COM #define	EQUAL_CONSUME \
147*11038SRao.Shoaib@Sun.COM 	do { \
148*11038SRao.Shoaib@Sun.COM 		rdata1 += n, rdlen1 -= n; \
149*11038SRao.Shoaib@Sun.COM 		rdata2 += n, rdlen2 -= n; \
150*11038SRao.Shoaib@Sun.COM 	} while (0)
151*11038SRao.Shoaib@Sun.COM 
152*11038SRao.Shoaib@Sun.COM #define	EQUAL_DNAME \
153*11038SRao.Shoaib@Sun.COM 	do { \
154*11038SRao.Shoaib@Sun.COM 		ssize_t n; \
155*11038SRao.Shoaib@Sun.COM 		\
156*11038SRao.Shoaib@Sun.COM 		if (rdlen1 != rdlen2) \
157*11038SRao.Shoaib@Sun.COM 			return (0); \
158*11038SRao.Shoaib@Sun.COM 		n = ns_name_eq(rdata1, rdlen1, rdata2, rdlen2); \
159*11038SRao.Shoaib@Sun.COM 		if (n <= 0) \
160*11038SRao.Shoaib@Sun.COM 			return (n); \
161*11038SRao.Shoaib@Sun.COM 		n = rdlen1; \
162*11038SRao.Shoaib@Sun.COM 		EQUAL_CONSUME; \
163*11038SRao.Shoaib@Sun.COM 	} while (0)
164*11038SRao.Shoaib@Sun.COM 
165*11038SRao.Shoaib@Sun.COM #define	EQUAL_SOME(x) \
166*11038SRao.Shoaib@Sun.COM 	do { \
167*11038SRao.Shoaib@Sun.COM 		size_t n = (x); \
168*11038SRao.Shoaib@Sun.COM 		\
169*11038SRao.Shoaib@Sun.COM 		if (n > rdlen1 || n > rdlen2) { \
170*11038SRao.Shoaib@Sun.COM 			errno = EMSGSIZE; \
171*11038SRao.Shoaib@Sun.COM 			return (-1); \
172*11038SRao.Shoaib@Sun.COM 		} \
173*11038SRao.Shoaib@Sun.COM 		if (memcmp(rdata1, rdata2, n) != 0) \
174*11038SRao.Shoaib@Sun.COM 			return (0); \
175*11038SRao.Shoaib@Sun.COM 		EQUAL_CONSUME; \
176*11038SRao.Shoaib@Sun.COM 	} while (0)
177*11038SRao.Shoaib@Sun.COM 
178*11038SRao.Shoaib@Sun.COM int
ns_rdata_equal(ns_type type,const u_char * rdata1,size_t rdlen1,const u_char * rdata2,size_t rdlen2)179*11038SRao.Shoaib@Sun.COM ns_rdata_equal(ns_type type,
180*11038SRao.Shoaib@Sun.COM 	       const u_char *rdata1, size_t rdlen1,
181*11038SRao.Shoaib@Sun.COM 	       const u_char *rdata2, size_t rdlen2)
182*11038SRao.Shoaib@Sun.COM {
183*11038SRao.Shoaib@Sun.COM 	switch (type) {
184*11038SRao.Shoaib@Sun.COM 	case ns_t_cname:
185*11038SRao.Shoaib@Sun.COM 	case ns_t_mb:
186*11038SRao.Shoaib@Sun.COM 	case ns_t_mg:
187*11038SRao.Shoaib@Sun.COM 	case ns_t_mr:
188*11038SRao.Shoaib@Sun.COM 	case ns_t_ns:
189*11038SRao.Shoaib@Sun.COM 	case ns_t_ptr:
190*11038SRao.Shoaib@Sun.COM 	case ns_t_dname:
191*11038SRao.Shoaib@Sun.COM 		EQUAL_DNAME;
192*11038SRao.Shoaib@Sun.COM 		break;
193*11038SRao.Shoaib@Sun.COM 	case ns_t_soa:
194*11038SRao.Shoaib@Sun.COM 		/* "There can be only one." --Highlander */
195*11038SRao.Shoaib@Sun.COM 		break;
196*11038SRao.Shoaib@Sun.COM 	case ns_t_mx:
197*11038SRao.Shoaib@Sun.COM 	case ns_t_afsdb:
198*11038SRao.Shoaib@Sun.COM 	case ns_t_rt:
199*11038SRao.Shoaib@Sun.COM 		EQUAL_SOME(NS_INT16SZ);
200*11038SRao.Shoaib@Sun.COM 		EQUAL_DNAME;
201*11038SRao.Shoaib@Sun.COM 		break;
202*11038SRao.Shoaib@Sun.COM 	case ns_t_px:
203*11038SRao.Shoaib@Sun.COM 		EQUAL_SOME(NS_INT16SZ);
204*11038SRao.Shoaib@Sun.COM 		EQUAL_DNAME;
205*11038SRao.Shoaib@Sun.COM 		EQUAL_DNAME;
206*11038SRao.Shoaib@Sun.COM 		break;
207*11038SRao.Shoaib@Sun.COM 	case ns_t_srv:
208*11038SRao.Shoaib@Sun.COM 		EQUAL_SOME(NS_INT16SZ * 3);
209*11038SRao.Shoaib@Sun.COM 		EQUAL_DNAME;
210*11038SRao.Shoaib@Sun.COM 		break;
211*11038SRao.Shoaib@Sun.COM 	case ns_t_minfo:
212*11038SRao.Shoaib@Sun.COM 	case ns_t_rp:
213*11038SRao.Shoaib@Sun.COM 		EQUAL_DNAME;
214*11038SRao.Shoaib@Sun.COM 		EQUAL_DNAME;
215*11038SRao.Shoaib@Sun.COM 		break;
216*11038SRao.Shoaib@Sun.COM 	default:
217*11038SRao.Shoaib@Sun.COM 		EQUAL_SOME(rdlen1);
218*11038SRao.Shoaib@Sun.COM 		break;
219*11038SRao.Shoaib@Sun.COM 	}
220*11038SRao.Shoaib@Sun.COM 	if (rdlen1 != 0 || rdlen2 != 0)
221*11038SRao.Shoaib@Sun.COM 		return (0);
222*11038SRao.Shoaib@Sun.COM 	return (1);
223*11038SRao.Shoaib@Sun.COM }
224*11038SRao.Shoaib@Sun.COM 
225*11038SRao.Shoaib@Sun.COM #define REFERS_DNAME \
226*11038SRao.Shoaib@Sun.COM 	do { \
227*11038SRao.Shoaib@Sun.COM 		int n; \
228*11038SRao.Shoaib@Sun.COM 		\
229*11038SRao.Shoaib@Sun.COM 		n = ns_name_eq(rdata, rdlen, nname, NS_MAXNNAME); \
230*11038SRao.Shoaib@Sun.COM 		if (n < 0) \
231*11038SRao.Shoaib@Sun.COM 			return (-1); \
232*11038SRao.Shoaib@Sun.COM 		if (n > 0) \
233*11038SRao.Shoaib@Sun.COM 			return (1); \
234*11038SRao.Shoaib@Sun.COM 		n = dn_skipname(rdata, rdata + rdlen); \
235*11038SRao.Shoaib@Sun.COM 		if (n < 0) \
236*11038SRao.Shoaib@Sun.COM 			return (-1); \
237*11038SRao.Shoaib@Sun.COM 		CONSUME_SRC; \
238*11038SRao.Shoaib@Sun.COM 	} while (0)
239*11038SRao.Shoaib@Sun.COM 
240*11038SRao.Shoaib@Sun.COM #define	REFERS_SOME(x) \
241*11038SRao.Shoaib@Sun.COM 	do { \
242*11038SRao.Shoaib@Sun.COM 		size_t n = (x); \
243*11038SRao.Shoaib@Sun.COM 		\
244*11038SRao.Shoaib@Sun.COM 		if (n > rdlen) { \
245*11038SRao.Shoaib@Sun.COM 			errno = EMSGSIZE; \
246*11038SRao.Shoaib@Sun.COM 			return (-1); \
247*11038SRao.Shoaib@Sun.COM 		} \
248*11038SRao.Shoaib@Sun.COM 		CONSUME_SRC; \
249*11038SRao.Shoaib@Sun.COM 	} while (0)
250*11038SRao.Shoaib@Sun.COM 
251*11038SRao.Shoaib@Sun.COM int
ns_rdata_refers(ns_type type,const u_char * rdata,size_t rdlen,const u_char * nname)252*11038SRao.Shoaib@Sun.COM ns_rdata_refers(ns_type type,
253*11038SRao.Shoaib@Sun.COM 		const u_char *rdata, size_t rdlen,
254*11038SRao.Shoaib@Sun.COM 		const u_char *nname)
255*11038SRao.Shoaib@Sun.COM {
256*11038SRao.Shoaib@Sun.COM 	switch (type) {
257*11038SRao.Shoaib@Sun.COM 	case ns_t_cname:
258*11038SRao.Shoaib@Sun.COM 	case ns_t_mb:
259*11038SRao.Shoaib@Sun.COM 	case ns_t_mg:
260*11038SRao.Shoaib@Sun.COM 	case ns_t_mr:
261*11038SRao.Shoaib@Sun.COM 	case ns_t_ns:
262*11038SRao.Shoaib@Sun.COM 	case ns_t_ptr:
263*11038SRao.Shoaib@Sun.COM 	case ns_t_dname:
264*11038SRao.Shoaib@Sun.COM 		REFERS_DNAME;
265*11038SRao.Shoaib@Sun.COM 		break;
266*11038SRao.Shoaib@Sun.COM 	case ns_t_soa:
267*11038SRao.Shoaib@Sun.COM 		REFERS_DNAME;
268*11038SRao.Shoaib@Sun.COM 		REFERS_DNAME;
269*11038SRao.Shoaib@Sun.COM 		REFERS_SOME(NS_INT32SZ * 5);
270*11038SRao.Shoaib@Sun.COM 		break;
271*11038SRao.Shoaib@Sun.COM 	case ns_t_mx:
272*11038SRao.Shoaib@Sun.COM 	case ns_t_afsdb:
273*11038SRao.Shoaib@Sun.COM 	case ns_t_rt:
274*11038SRao.Shoaib@Sun.COM 		REFERS_SOME(NS_INT16SZ);
275*11038SRao.Shoaib@Sun.COM 		REFERS_DNAME;
276*11038SRao.Shoaib@Sun.COM 		break;
277*11038SRao.Shoaib@Sun.COM 	case ns_t_px:
278*11038SRao.Shoaib@Sun.COM 		REFERS_SOME(NS_INT16SZ);
279*11038SRao.Shoaib@Sun.COM 		REFERS_DNAME;
280*11038SRao.Shoaib@Sun.COM 		REFERS_DNAME;
281*11038SRao.Shoaib@Sun.COM 		break;
282*11038SRao.Shoaib@Sun.COM 	case ns_t_srv:
283*11038SRao.Shoaib@Sun.COM 		REFERS_SOME(NS_INT16SZ * 3);
284*11038SRao.Shoaib@Sun.COM 		REFERS_DNAME;
285*11038SRao.Shoaib@Sun.COM 		break;
286*11038SRao.Shoaib@Sun.COM 	case ns_t_minfo:
287*11038SRao.Shoaib@Sun.COM 	case ns_t_rp:
288*11038SRao.Shoaib@Sun.COM 		REFERS_DNAME;
289*11038SRao.Shoaib@Sun.COM 		REFERS_DNAME;
290*11038SRao.Shoaib@Sun.COM 		break;
291*11038SRao.Shoaib@Sun.COM 	default:
292*11038SRao.Shoaib@Sun.COM 		REFERS_SOME(rdlen);
293*11038SRao.Shoaib@Sun.COM 		break;
294*11038SRao.Shoaib@Sun.COM 	}
295*11038SRao.Shoaib@Sun.COM 	if (rdlen != 0) {
296*11038SRao.Shoaib@Sun.COM 		errno = EMSGSIZE;
297*11038SRao.Shoaib@Sun.COM 		return (-1);
298*11038SRao.Shoaib@Sun.COM 	}
299*11038SRao.Shoaib@Sun.COM 	return (0);
300*11038SRao.Shoaib@Sun.COM }
301