1*00b67f09SDavid van Moolenbroek /* $NetBSD: getnameinfo.c,v 1.7 2015/07/08 17:28:59 christos Exp $ */
2*00b67f09SDavid van Moolenbroek
3*00b67f09SDavid van Moolenbroek /*
4*00b67f09SDavid van Moolenbroek * Copyright (C) 2009, 2011-2014 Internet Systems Consortium, Inc. ("ISC")
5*00b67f09SDavid van Moolenbroek *
6*00b67f09SDavid van Moolenbroek * Permission to use, copy, modify, and/or distribute this software for any
7*00b67f09SDavid van Moolenbroek * purpose with or without fee is hereby granted, provided that the above
8*00b67f09SDavid van Moolenbroek * copyright notice and this permission notice appear in all copies.
9*00b67f09SDavid van Moolenbroek *
10*00b67f09SDavid van Moolenbroek * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
11*00b67f09SDavid van Moolenbroek * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
12*00b67f09SDavid van Moolenbroek * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
13*00b67f09SDavid van Moolenbroek * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
14*00b67f09SDavid van Moolenbroek * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
15*00b67f09SDavid van Moolenbroek * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
16*00b67f09SDavid van Moolenbroek * PERFORMANCE OF THIS SOFTWARE.
17*00b67f09SDavid van Moolenbroek */
18*00b67f09SDavid van Moolenbroek
19*00b67f09SDavid van Moolenbroek /* Id */
20*00b67f09SDavid van Moolenbroek
21*00b67f09SDavid van Moolenbroek /*! \file */
22*00b67f09SDavid van Moolenbroek
23*00b67f09SDavid van Moolenbroek /*
24*00b67f09SDavid van Moolenbroek * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
25*00b67f09SDavid van Moolenbroek * All rights reserved.
26*00b67f09SDavid van Moolenbroek *
27*00b67f09SDavid van Moolenbroek * Redistribution and use in source and binary forms, with or without
28*00b67f09SDavid van Moolenbroek * modification, are permitted provided that the following conditions
29*00b67f09SDavid van Moolenbroek * are met:
30*00b67f09SDavid van Moolenbroek * 1. Redistributions of source code must retain the above copyright
31*00b67f09SDavid van Moolenbroek * notice, this list of conditions and the following disclaimer.
32*00b67f09SDavid van Moolenbroek * 2. Redistributions in binary form must reproduce the above copyright
33*00b67f09SDavid van Moolenbroek * notice, this list of conditions and the following disclaimer in the
34*00b67f09SDavid van Moolenbroek * documentation and/or other materials provided with the distribution.
35*00b67f09SDavid van Moolenbroek * 3. Neither the name of the project nor the names of its contributors
36*00b67f09SDavid van Moolenbroek * may be used to endorse or promote products derived from this software
37*00b67f09SDavid van Moolenbroek * without specific prior written permission.
38*00b67f09SDavid van Moolenbroek *
39*00b67f09SDavid van Moolenbroek * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
40*00b67f09SDavid van Moolenbroek * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41*00b67f09SDavid van Moolenbroek * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
42*00b67f09SDavid van Moolenbroek * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
43*00b67f09SDavid van Moolenbroek * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
44*00b67f09SDavid van Moolenbroek * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
45*00b67f09SDavid van Moolenbroek * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46*00b67f09SDavid van Moolenbroek * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
47*00b67f09SDavid van Moolenbroek * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
48*00b67f09SDavid van Moolenbroek * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
49*00b67f09SDavid van Moolenbroek * SUCH DAMAGE.
50*00b67f09SDavid van Moolenbroek */
51*00b67f09SDavid van Moolenbroek
52*00b67f09SDavid van Moolenbroek /**
53*00b67f09SDavid van Moolenbroek * getnameinfo() returns the hostname for the struct sockaddr sa which is
54*00b67f09SDavid van Moolenbroek * salen bytes long. The hostname is of length hostlen and is returned via
55*00b67f09SDavid van Moolenbroek * *host. The maximum length of the hostname is 1025 bytes: #NI_MAXHOST.
56*00b67f09SDavid van Moolenbroek *
57*00b67f09SDavid van Moolenbroek * The name of the service associated with the port number in sa is
58*00b67f09SDavid van Moolenbroek * returned in *serv. It is servlen bytes long. The maximum length of the
59*00b67f09SDavid van Moolenbroek * service name is #NI_MAXSERV - 32 bytes.
60*00b67f09SDavid van Moolenbroek *
61*00b67f09SDavid van Moolenbroek * The flags argument sets the following bits:
62*00b67f09SDavid van Moolenbroek *
63*00b67f09SDavid van Moolenbroek * \li #NI_NOFQDN:
64*00b67f09SDavid van Moolenbroek * A fully qualified domain name is not required for local hosts.
65*00b67f09SDavid van Moolenbroek * The local part of the fully qualified domain name is returned
66*00b67f09SDavid van Moolenbroek * instead.
67*00b67f09SDavid van Moolenbroek *
68*00b67f09SDavid van Moolenbroek * \li #NI_NUMERICHOST
69*00b67f09SDavid van Moolenbroek * Return the address in numeric form, as if calling inet_ntop(),
70*00b67f09SDavid van Moolenbroek * instead of a host name.
71*00b67f09SDavid van Moolenbroek *
72*00b67f09SDavid van Moolenbroek * \li #NI_NAMEREQD
73*00b67f09SDavid van Moolenbroek * A name is required. If the hostname cannot be found in the DNS
74*00b67f09SDavid van Moolenbroek * and this flag is set, a non-zero error code is returned. If the
75*00b67f09SDavid van Moolenbroek * hostname is not found and the flag is not set, the address is
76*00b67f09SDavid van Moolenbroek * returned in numeric form.
77*00b67f09SDavid van Moolenbroek *
78*00b67f09SDavid van Moolenbroek * \li #NI_NUMERICSERV
79*00b67f09SDavid van Moolenbroek * The service name is returned as a digit string representing the
80*00b67f09SDavid van Moolenbroek * port number.
81*00b67f09SDavid van Moolenbroek *
82*00b67f09SDavid van Moolenbroek * \li #NI_DGRAM
83*00b67f09SDavid van Moolenbroek * Specifies that the service being looked up is a datagram
84*00b67f09SDavid van Moolenbroek * service, and causes getservbyport() to be called with a second
85*00b67f09SDavid van Moolenbroek * argument of "udp" instead of its default of "tcp". This is
86*00b67f09SDavid van Moolenbroek * required for the few ports (512-514) that have different
87*00b67f09SDavid van Moolenbroek * services for UDP and TCP.
88*00b67f09SDavid van Moolenbroek *
89*00b67f09SDavid van Moolenbroek * \section getnameinfo_return Return Values
90*00b67f09SDavid van Moolenbroek *
91*00b67f09SDavid van Moolenbroek * getnameinfo() returns 0 on success or a non-zero error code if
92*00b67f09SDavid van Moolenbroek * an error occurs.
93*00b67f09SDavid van Moolenbroek *
94*00b67f09SDavid van Moolenbroek * \section getname_see See Also
95*00b67f09SDavid van Moolenbroek *
96*00b67f09SDavid van Moolenbroek * RFC3493, getservbyport(),
97*00b67f09SDavid van Moolenbroek * getnamebyaddr(). inet_ntop().
98*00b67f09SDavid van Moolenbroek */
99*00b67f09SDavid van Moolenbroek
100*00b67f09SDavid van Moolenbroek #include <config.h>
101*00b67f09SDavid van Moolenbroek
102*00b67f09SDavid van Moolenbroek #include <stdio.h>
103*00b67f09SDavid van Moolenbroek #include <string.h>
104*00b67f09SDavid van Moolenbroek
105*00b67f09SDavid van Moolenbroek #include <isc/netaddr.h>
106*00b67f09SDavid van Moolenbroek #include <isc/print.h>
107*00b67f09SDavid van Moolenbroek #include <isc/sockaddr.h>
108*00b67f09SDavid van Moolenbroek #include <isc/util.h>
109*00b67f09SDavid van Moolenbroek
110*00b67f09SDavid van Moolenbroek #include <dns/byaddr.h>
111*00b67f09SDavid van Moolenbroek #include <dns/client.h>
112*00b67f09SDavid van Moolenbroek #include <dns/fixedname.h>
113*00b67f09SDavid van Moolenbroek #include <dns/name.h>
114*00b67f09SDavid van Moolenbroek #include <dns/rdata.h>
115*00b67f09SDavid van Moolenbroek #include <dns/rdataset.h>
116*00b67f09SDavid van Moolenbroek #include <dns/rdatastruct.h>
117*00b67f09SDavid van Moolenbroek #include <dns/result.h>
118*00b67f09SDavid van Moolenbroek
119*00b67f09SDavid van Moolenbroek #include <irs/context.h>
120*00b67f09SDavid van Moolenbroek #include <irs/netdb.h>
121*00b67f09SDavid van Moolenbroek
122*00b67f09SDavid van Moolenbroek #define SUCCESS 0
123*00b67f09SDavid van Moolenbroek
124*00b67f09SDavid van Moolenbroek /*% afd structure definition */
125*00b67f09SDavid van Moolenbroek static struct afd {
126*00b67f09SDavid van Moolenbroek int a_af;
127*00b67f09SDavid van Moolenbroek size_t a_addrlen;
128*00b67f09SDavid van Moolenbroek size_t a_socklen;
129*00b67f09SDavid van Moolenbroek } afdl [] = {
130*00b67f09SDavid van Moolenbroek /*!
131*00b67f09SDavid van Moolenbroek * First entry is linked last...
132*00b67f09SDavid van Moolenbroek */
133*00b67f09SDavid van Moolenbroek { AF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in) },
134*00b67f09SDavid van Moolenbroek { AF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6) },
135*00b67f09SDavid van Moolenbroek {0, 0, 0},
136*00b67f09SDavid van Moolenbroek };
137*00b67f09SDavid van Moolenbroek
138*00b67f09SDavid van Moolenbroek /*!
139*00b67f09SDavid van Moolenbroek * The test against 0 is there to keep the Solaris compiler
140*00b67f09SDavid van Moolenbroek * from complaining about "end-of-loop code not reached".
141*00b67f09SDavid van Moolenbroek */
142*00b67f09SDavid van Moolenbroek #define ERR(code) \
143*00b67f09SDavid van Moolenbroek do { result = (code); \
144*00b67f09SDavid van Moolenbroek if (result != 0) goto cleanup; \
145*00b67f09SDavid van Moolenbroek } while (/*CONSTCOND*/0)
146*00b67f09SDavid van Moolenbroek
147*00b67f09SDavid van Moolenbroek int
getnameinfo(const struct sockaddr * sa,IRS_GETNAMEINFO_SOCKLEN_T salen,char * host,IRS_GETNAMEINFO_BUFLEN_T hostlen,char * serv,IRS_GETNAMEINFO_BUFLEN_T servlen,IRS_GETNAMEINFO_FLAGS_T flags)148*00b67f09SDavid van Moolenbroek getnameinfo(const struct sockaddr *sa, IRS_GETNAMEINFO_SOCKLEN_T salen,
149*00b67f09SDavid van Moolenbroek char *host, IRS_GETNAMEINFO_BUFLEN_T hostlen,
150*00b67f09SDavid van Moolenbroek char *serv, IRS_GETNAMEINFO_BUFLEN_T servlen,
151*00b67f09SDavid van Moolenbroek IRS_GETNAMEINFO_FLAGS_T flags)
152*00b67f09SDavid van Moolenbroek {
153*00b67f09SDavid van Moolenbroek struct afd *afd = NULL;
154*00b67f09SDavid van Moolenbroek struct servent *sp;
155*00b67f09SDavid van Moolenbroek unsigned short port = 0;
156*00b67f09SDavid van Moolenbroek #ifdef IRS_PLATFORM_HAVESALEN
157*00b67f09SDavid van Moolenbroek size_t len;
158*00b67f09SDavid van Moolenbroek #endif
159*00b67f09SDavid van Moolenbroek int family, i;
160*00b67f09SDavid van Moolenbroek const void *addr = NULL;
161*00b67f09SDavid van Moolenbroek char *p;
162*00b67f09SDavid van Moolenbroek #if 0
163*00b67f09SDavid van Moolenbroek unsigned long v4a;
164*00b67f09SDavid van Moolenbroek unsigned char pfx;
165*00b67f09SDavid van Moolenbroek #endif
166*00b67f09SDavid van Moolenbroek char numserv[sizeof("65000")];
167*00b67f09SDavid van Moolenbroek char numaddr[sizeof("abcd:abcd:abcd:abcd:abcd:abcd:255.255.255.255")
168*00b67f09SDavid van Moolenbroek + 1 + sizeof("4294967295")];
169*00b67f09SDavid van Moolenbroek const char *proto;
170*00b67f09SDavid van Moolenbroek int result = SUCCESS;
171*00b67f09SDavid van Moolenbroek
172*00b67f09SDavid van Moolenbroek if (sa == NULL)
173*00b67f09SDavid van Moolenbroek ERR(EAI_FAIL);
174*00b67f09SDavid van Moolenbroek
175*00b67f09SDavid van Moolenbroek #ifdef IRS_PLATFORM_HAVESALEN
176*00b67f09SDavid van Moolenbroek len = sa->sa_len;
177*00b67f09SDavid van Moolenbroek if (len != salen)
178*00b67f09SDavid van Moolenbroek ERR(EAI_FAIL);
179*00b67f09SDavid van Moolenbroek #endif
180*00b67f09SDavid van Moolenbroek
181*00b67f09SDavid van Moolenbroek family = sa->sa_family;
182*00b67f09SDavid van Moolenbroek for (i = 0; afdl[i].a_af; i++)
183*00b67f09SDavid van Moolenbroek if (afdl[i].a_af == family) {
184*00b67f09SDavid van Moolenbroek afd = &afdl[i];
185*00b67f09SDavid van Moolenbroek goto found;
186*00b67f09SDavid van Moolenbroek }
187*00b67f09SDavid van Moolenbroek ERR(EAI_FAMILY);
188*00b67f09SDavid van Moolenbroek
189*00b67f09SDavid van Moolenbroek found:
190*00b67f09SDavid van Moolenbroek if (salen != afd->a_socklen)
191*00b67f09SDavid van Moolenbroek ERR(EAI_FAIL);
192*00b67f09SDavid van Moolenbroek
193*00b67f09SDavid van Moolenbroek switch (family) {
194*00b67f09SDavid van Moolenbroek case AF_INET:
195*00b67f09SDavid van Moolenbroek port = ((const struct sockaddr_in *)sa)->sin_port;
196*00b67f09SDavid van Moolenbroek addr = &((const struct sockaddr_in *)sa)->sin_addr.s_addr;
197*00b67f09SDavid van Moolenbroek break;
198*00b67f09SDavid van Moolenbroek
199*00b67f09SDavid van Moolenbroek case AF_INET6:
200*00b67f09SDavid van Moolenbroek port = ((const struct sockaddr_in6 *)sa)->sin6_port;
201*00b67f09SDavid van Moolenbroek addr = ((const struct sockaddr_in6 *)sa)->sin6_addr.s6_addr;
202*00b67f09SDavid van Moolenbroek break;
203*00b67f09SDavid van Moolenbroek
204*00b67f09SDavid van Moolenbroek default:
205*00b67f09SDavid van Moolenbroek INSIST(0);
206*00b67f09SDavid van Moolenbroek }
207*00b67f09SDavid van Moolenbroek proto = (flags & NI_DGRAM) ? "udp" : "tcp";
208*00b67f09SDavid van Moolenbroek
209*00b67f09SDavid van Moolenbroek if (serv == NULL || servlen == 0U) {
210*00b67f09SDavid van Moolenbroek /*
211*00b67f09SDavid van Moolenbroek * Caller does not want service.
212*00b67f09SDavid van Moolenbroek */
213*00b67f09SDavid van Moolenbroek } else if ((flags & NI_NUMERICSERV) != 0 ||
214*00b67f09SDavid van Moolenbroek (sp = getservbyport(port, proto)) == NULL) {
215*00b67f09SDavid van Moolenbroek snprintf(numserv, sizeof(numserv), "%d", ntohs(port));
216*00b67f09SDavid van Moolenbroek if ((strlen(numserv) + 1) > servlen)
217*00b67f09SDavid van Moolenbroek ERR(EAI_OVERFLOW);
218*00b67f09SDavid van Moolenbroek strcpy(serv, numserv);
219*00b67f09SDavid van Moolenbroek } else {
220*00b67f09SDavid van Moolenbroek if ((strlen(sp->s_name) + 1) > servlen)
221*00b67f09SDavid van Moolenbroek ERR(EAI_OVERFLOW);
222*00b67f09SDavid van Moolenbroek strcpy(serv, sp->s_name);
223*00b67f09SDavid van Moolenbroek }
224*00b67f09SDavid van Moolenbroek
225*00b67f09SDavid van Moolenbroek #if 0
226*00b67f09SDavid van Moolenbroek switch (sa->sa_family) {
227*00b67f09SDavid van Moolenbroek case AF_INET:
228*00b67f09SDavid van Moolenbroek v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
229*00b67f09SDavid van Moolenbroek if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
230*00b67f09SDavid van Moolenbroek flags |= NI_NUMERICHOST;
231*00b67f09SDavid van Moolenbroek v4a >>= IN_CLASSA_NSHIFT;
232*00b67f09SDavid van Moolenbroek if (v4a == 0 || v4a == IN_LOOPBACKNET)
233*00b67f09SDavid van Moolenbroek flags |= NI_NUMERICHOST;
234*00b67f09SDavid van Moolenbroek break;
235*00b67f09SDavid van Moolenbroek
236*00b67f09SDavid van Moolenbroek case AF_INET6:
237*00b67f09SDavid van Moolenbroek pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr[0];
238*00b67f09SDavid van Moolenbroek if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
239*00b67f09SDavid van Moolenbroek flags |= NI_NUMERICHOST;
240*00b67f09SDavid van Moolenbroek break;
241*00b67f09SDavid van Moolenbroek }
242*00b67f09SDavid van Moolenbroek #endif
243*00b67f09SDavid van Moolenbroek
244*00b67f09SDavid van Moolenbroek if (host == NULL || hostlen == 0U) {
245*00b67f09SDavid van Moolenbroek /*
246*00b67f09SDavid van Moolenbroek * do nothing in this case.
247*00b67f09SDavid van Moolenbroek * in case you are wondering if "&&" is more correct than
248*00b67f09SDavid van Moolenbroek * "||" here: RFC3493 says that host == NULL or hostlen == 0
249*00b67f09SDavid van Moolenbroek * means that the caller does not want the result.
250*00b67f09SDavid van Moolenbroek */
251*00b67f09SDavid van Moolenbroek } else if ((flags & NI_NUMERICHOST) != 0) {
252*00b67f09SDavid van Moolenbroek if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
253*00b67f09SDavid van Moolenbroek == NULL)
254*00b67f09SDavid van Moolenbroek ERR(EAI_SYSTEM);
255*00b67f09SDavid van Moolenbroek #if defined(IRS_HAVE_SIN6_SCOPE_ID)
256*00b67f09SDavid van Moolenbroek if (afd->a_af == AF_INET6 &&
257*00b67f09SDavid van Moolenbroek ((const struct sockaddr_in6 *)sa)->sin6_scope_id) {
258*00b67f09SDavid van Moolenbroek char *p = numaddr + strlen(numaddr);
259*00b67f09SDavid van Moolenbroek const char *stringscope = NULL;
260*00b67f09SDavid van Moolenbroek #ifdef VENDOR_SPECIFIC
261*00b67f09SDavid van Moolenbroek /*
262*00b67f09SDavid van Moolenbroek * Vendors may want to add support for
263*00b67f09SDavid van Moolenbroek * non-numeric scope identifier.
264*00b67f09SDavid van Moolenbroek */
265*00b67f09SDavid van Moolenbroek stringscope = foo;
266*00b67f09SDavid van Moolenbroek #endif
267*00b67f09SDavid van Moolenbroek if (stringscope == NULL) {
268*00b67f09SDavid van Moolenbroek snprintf(p, sizeof(numaddr) - (p - numaddr),
269*00b67f09SDavid van Moolenbroek "%%%u",
270*00b67f09SDavid van Moolenbroek ((const struct sockaddr_in6 *)sa)->sin6_scope_id);
271*00b67f09SDavid van Moolenbroek } else {
272*00b67f09SDavid van Moolenbroek snprintf(p, sizeof(numaddr) - (p - numaddr),
273*00b67f09SDavid van Moolenbroek "%%%s", stringscope);
274*00b67f09SDavid van Moolenbroek }
275*00b67f09SDavid van Moolenbroek }
276*00b67f09SDavid van Moolenbroek #endif
277*00b67f09SDavid van Moolenbroek if (strlen(numaddr) + 1 > hostlen)
278*00b67f09SDavid van Moolenbroek ERR(EAI_OVERFLOW);
279*00b67f09SDavid van Moolenbroek strcpy(host, numaddr);
280*00b67f09SDavid van Moolenbroek } else {
281*00b67f09SDavid van Moolenbroek isc_netaddr_t netaddr;
282*00b67f09SDavid van Moolenbroek dns_fixedname_t ptrfname;
283*00b67f09SDavid van Moolenbroek dns_name_t *ptrname;
284*00b67f09SDavid van Moolenbroek irs_context_t *irsctx = NULL;
285*00b67f09SDavid van Moolenbroek dns_client_t *client;
286*00b67f09SDavid van Moolenbroek isc_boolean_t found = ISC_FALSE;
287*00b67f09SDavid van Moolenbroek dns_namelist_t answerlist;
288*00b67f09SDavid van Moolenbroek dns_rdataset_t *rdataset;
289*00b67f09SDavid van Moolenbroek isc_region_t hostregion;
290*00b67f09SDavid van Moolenbroek char hoststr[1024]; /* is this enough? */
291*00b67f09SDavid van Moolenbroek isc_result_t iresult;
292*00b67f09SDavid van Moolenbroek
293*00b67f09SDavid van Moolenbroek /* Get IRS context and the associated DNS client object */
294*00b67f09SDavid van Moolenbroek iresult = irs_context_get(&irsctx);
295*00b67f09SDavid van Moolenbroek if (iresult != ISC_R_SUCCESS)
296*00b67f09SDavid van Moolenbroek ERR(EAI_FAIL);
297*00b67f09SDavid van Moolenbroek client = irs_context_getdnsclient(irsctx);
298*00b67f09SDavid van Moolenbroek
299*00b67f09SDavid van Moolenbroek /* Make query name */
300*00b67f09SDavid van Moolenbroek isc_netaddr_fromsockaddr(&netaddr, (const isc_sockaddr_t *)sa);
301*00b67f09SDavid van Moolenbroek dns_fixedname_init(&ptrfname);
302*00b67f09SDavid van Moolenbroek ptrname = dns_fixedname_name(&ptrfname);
303*00b67f09SDavid van Moolenbroek iresult = dns_byaddr_createptrname2(&netaddr, 0, ptrname);
304*00b67f09SDavid van Moolenbroek if (iresult != ISC_R_SUCCESS)
305*00b67f09SDavid van Moolenbroek ERR(EAI_FAIL);
306*00b67f09SDavid van Moolenbroek
307*00b67f09SDavid van Moolenbroek /* Get the PTR RRset */
308*00b67f09SDavid van Moolenbroek ISC_LIST_INIT(answerlist);
309*00b67f09SDavid van Moolenbroek iresult = dns_client_resolve(client, ptrname,
310*00b67f09SDavid van Moolenbroek dns_rdataclass_in,
311*00b67f09SDavid van Moolenbroek dns_rdatatype_ptr,
312*00b67f09SDavid van Moolenbroek DNS_CLIENTRESOPT_ALLOWRUN,
313*00b67f09SDavid van Moolenbroek &answerlist);
314*00b67f09SDavid van Moolenbroek switch (iresult) {
315*00b67f09SDavid van Moolenbroek case ISC_R_SUCCESS:
316*00b67f09SDavid van Moolenbroek /*
317*00b67f09SDavid van Moolenbroek * a 'non-existent' error is not necessarily fatal for
318*00b67f09SDavid van Moolenbroek * getnameinfo().
319*00b67f09SDavid van Moolenbroek */
320*00b67f09SDavid van Moolenbroek case DNS_R_NCACHENXDOMAIN:
321*00b67f09SDavid van Moolenbroek case DNS_R_NCACHENXRRSET:
322*00b67f09SDavid van Moolenbroek break;
323*00b67f09SDavid van Moolenbroek case DNS_R_SIGINVALID:
324*00b67f09SDavid van Moolenbroek case DNS_R_SIGEXPIRED:
325*00b67f09SDavid van Moolenbroek case DNS_R_SIGFUTURE:
326*00b67f09SDavid van Moolenbroek case DNS_R_KEYUNAUTHORIZED:
327*00b67f09SDavid van Moolenbroek case DNS_R_MUSTBESECURE:
328*00b67f09SDavid van Moolenbroek case DNS_R_COVERINGNSEC:
329*00b67f09SDavid van Moolenbroek case DNS_R_NOTAUTHORITATIVE:
330*00b67f09SDavid van Moolenbroek case DNS_R_NOVALIDKEY:
331*00b67f09SDavid van Moolenbroek case DNS_R_NOVALIDDS:
332*00b67f09SDavid van Moolenbroek case DNS_R_NOVALIDSIG:
333*00b67f09SDavid van Moolenbroek ERR(EAI_INSECUREDATA);
334*00b67f09SDavid van Moolenbroek break;
335*00b67f09SDavid van Moolenbroek default:
336*00b67f09SDavid van Moolenbroek ERR(EAI_FAIL);
337*00b67f09SDavid van Moolenbroek }
338*00b67f09SDavid van Moolenbroek
339*00b67f09SDavid van Moolenbroek /* Parse the answer for the hostname */
340*00b67f09SDavid van Moolenbroek for (ptrname = ISC_LIST_HEAD(answerlist); ptrname != NULL;
341*00b67f09SDavid van Moolenbroek ptrname = ISC_LIST_NEXT(ptrname, link)) {
342*00b67f09SDavid van Moolenbroek for (rdataset = ISC_LIST_HEAD(ptrname->list);
343*00b67f09SDavid van Moolenbroek rdataset != NULL;
344*00b67f09SDavid van Moolenbroek rdataset = ISC_LIST_NEXT(rdataset, link)) {
345*00b67f09SDavid van Moolenbroek if (!dns_rdataset_isassociated(rdataset))
346*00b67f09SDavid van Moolenbroek continue;
347*00b67f09SDavid van Moolenbroek if (rdataset->type != dns_rdatatype_ptr)
348*00b67f09SDavid van Moolenbroek continue;
349*00b67f09SDavid van Moolenbroek
350*00b67f09SDavid van Moolenbroek for (iresult = dns_rdataset_first(rdataset);
351*00b67f09SDavid van Moolenbroek iresult == ISC_R_SUCCESS;
352*00b67f09SDavid van Moolenbroek iresult = dns_rdataset_next(rdataset)) {
353*00b67f09SDavid van Moolenbroek dns_rdata_t rdata;
354*00b67f09SDavid van Moolenbroek dns_rdata_ptr_t rdata_ptr;
355*00b67f09SDavid van Moolenbroek isc_buffer_t b;
356*00b67f09SDavid van Moolenbroek
357*00b67f09SDavid van Moolenbroek dns_rdata_init(&rdata);
358*00b67f09SDavid van Moolenbroek dns_rdataset_current(rdataset, &rdata);
359*00b67f09SDavid van Moolenbroek dns_rdata_tostruct(&rdata, &rdata_ptr,
360*00b67f09SDavid van Moolenbroek NULL);
361*00b67f09SDavid van Moolenbroek
362*00b67f09SDavid van Moolenbroek isc_buffer_init(&b, hoststr,
363*00b67f09SDavid van Moolenbroek sizeof(hoststr));
364*00b67f09SDavid van Moolenbroek iresult =
365*00b67f09SDavid van Moolenbroek dns_name_totext(&rdata_ptr.ptr,
366*00b67f09SDavid van Moolenbroek ISC_TRUE, &b);
367*00b67f09SDavid van Moolenbroek dns_rdata_freestruct(&rdata_ptr);
368*00b67f09SDavid van Moolenbroek if (iresult == ISC_R_SUCCESS) {
369*00b67f09SDavid van Moolenbroek /*
370*00b67f09SDavid van Moolenbroek * We ignore the rest of the
371*00b67f09SDavid van Moolenbroek * answer. After all,
372*00b67f09SDavid van Moolenbroek * getnameinfo() can return
373*00b67f09SDavid van Moolenbroek * at most one hostname.
374*00b67f09SDavid van Moolenbroek */
375*00b67f09SDavid van Moolenbroek found = ISC_TRUE;
376*00b67f09SDavid van Moolenbroek isc_buffer_usedregion(
377*00b67f09SDavid van Moolenbroek &b, &hostregion);
378*00b67f09SDavid van Moolenbroek goto ptrfound;
379*00b67f09SDavid van Moolenbroek }
380*00b67f09SDavid van Moolenbroek
381*00b67f09SDavid van Moolenbroek }
382*00b67f09SDavid van Moolenbroek }
383*00b67f09SDavid van Moolenbroek }
384*00b67f09SDavid van Moolenbroek ptrfound:
385*00b67f09SDavid van Moolenbroek dns_client_freeresanswer(client, &answerlist);
386*00b67f09SDavid van Moolenbroek if (found) {
387*00b67f09SDavid van Moolenbroek if ((flags & NI_NOFQDN) != 0) {
388*00b67f09SDavid van Moolenbroek p = strchr(hoststr, '.');
389*00b67f09SDavid van Moolenbroek if (p)
390*00b67f09SDavid van Moolenbroek *p = '\0';
391*00b67f09SDavid van Moolenbroek }
392*00b67f09SDavid van Moolenbroek if (hostregion.length + 1 > hostlen)
393*00b67f09SDavid van Moolenbroek ERR(EAI_OVERFLOW);
394*00b67f09SDavid van Moolenbroek snprintf(host, hostlen, "%.*s",
395*00b67f09SDavid van Moolenbroek (int)hostregion.length,
396*00b67f09SDavid van Moolenbroek (char *)hostregion.base);
397*00b67f09SDavid van Moolenbroek } else {
398*00b67f09SDavid van Moolenbroek if ((flags & NI_NAMEREQD) != 0)
399*00b67f09SDavid van Moolenbroek ERR(EAI_NONAME);
400*00b67f09SDavid van Moolenbroek if (inet_ntop(afd->a_af, addr, numaddr,
401*00b67f09SDavid van Moolenbroek sizeof(numaddr)) == NULL)
402*00b67f09SDavid van Moolenbroek ERR(EAI_SYSTEM);
403*00b67f09SDavid van Moolenbroek if ((strlen(numaddr) + 1) > hostlen)
404*00b67f09SDavid van Moolenbroek ERR(EAI_OVERFLOW);
405*00b67f09SDavid van Moolenbroek strcpy(host, numaddr);
406*00b67f09SDavid van Moolenbroek }
407*00b67f09SDavid van Moolenbroek }
408*00b67f09SDavid van Moolenbroek result = SUCCESS;
409*00b67f09SDavid van Moolenbroek
410*00b67f09SDavid van Moolenbroek cleanup:
411*00b67f09SDavid van Moolenbroek return (result);
412*00b67f09SDavid van Moolenbroek }
413