2 * Copyright (C) 2009, 2011, 2012 Internet Systems Consortium, Inc. ("ISC")
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
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22 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
23 * All rights reserved.
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26 * modification, are permitted provided that the following conditions
28 * 1. Redistributions of source code must retain the above copyright
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30 * 2. Redistributions in binary form must reproduce the above copyright
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34 * may be used to endorse or promote products derived from this software
35 * without specific prior written permission.
37 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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40 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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43 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
45 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
46 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * getnameinfo() returns the hostname for the struct sockaddr sa which is
52 * salen bytes long. The hostname is of length hostlen and is returned via
53 * *host. The maximum length of the hostname is 1025 bytes: #NI_MAXHOST.
55 * The name of the service associated with the port number in sa is
56 * returned in *serv. It is servlen bytes long. The maximum length of the
57 * service name is #NI_MAXSERV - 32 bytes.
59 * The flags argument sets the following bits:
62 * A fully qualified domain name is not required for local hosts.
63 * The local part of the fully qualified domain name is returned
67 * Return the address in numeric form, as if calling inet_ntop(),
68 * instead of a host name.
71 * A name is required. If the hostname cannot be found in the DNS
72 * and this flag is set, a non-zero error code is returned. If the
73 * hostname is not found and the flag is not set, the address is
74 * returned in numeric form.
77 * The service name is returned as a digit string representing the
81 * Specifies that the service being looked up is a datagram
82 * service, and causes getservbyport() to be called with a second
83 * argument of "udp" instead of its default of "tcp". This is
84 * required for the few ports (512-514) that have different
85 * services for UDP and TCP.
87 * \section getnameinfo_return Return Values
89 * getnameinfo() returns 0 on success or a non-zero error code if
92 * \section getname_see See Also
94 * RFC3493, getservbyport(),
95 * getnamebyaddr(). inet_ntop().
103 #include <isc/netaddr.h>
104 #include <isc/print.h>
105 #include <isc/sockaddr.h>
106 #include <isc/util.h>
108 #include <dns/byaddr.h>
109 #include <dns/client.h>
110 #include <dns/fixedname.h>
111 #include <dns/name.h>
112 #include <dns/rdata.h>
113 #include <dns/rdataset.h>
114 #include <dns/rdatastruct.h>
115 #include <dns/result.h>
117 #include <irs/context.h>
118 #include <irs/netdb.h>
122 /*% afd structure definition */
129 * First entry is linked last...
131 { AF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in) },
132 { AF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6) },
137 * The test against 0 is there to keep the Solaris compiler
138 * from complaining about "end-of-loop code not reached".
141 do { result = (code); \
142 if (result != 0) goto cleanup; \
146 getnameinfo(const struct sockaddr *sa, socklen_t salen, char *host,
147 IRS_GETNAMEINFO_BUFLEN_T hostlen, char *serv,
148 IRS_GETNAMEINFO_BUFLEN_T servlen, IRS_GETNAMEINFO_FLAGS_T flags)
152 unsigned short port = 0;
153 #ifdef IRS_PLATFORM_HAVESALEN
157 const void *addr = NULL;
163 char numserv[sizeof("65000")];
164 char numaddr[sizeof("abcd:abcd:abcd:abcd:abcd:abcd:255.255.255.255")
165 + 1 + sizeof("4294967295")];
167 int result = SUCCESS;
172 #ifdef IRS_PLATFORM_HAVESALEN
178 family = sa->sa_family;
179 for (i = 0; afdl[i].a_af; i++)
180 if (afdl[i].a_af == family) {
187 if (salen != afd->a_socklen)
192 port = ((const struct sockaddr_in *)sa)->sin_port;
193 addr = &((const struct sockaddr_in *)sa)->sin_addr.s_addr;
197 port = ((const struct sockaddr_in6 *)sa)->sin6_port;
198 addr = ((const struct sockaddr_in6 *)sa)->sin6_addr.s6_addr;
204 proto = (flags & NI_DGRAM) ? "udp" : "tcp";
206 if (serv == NULL || servlen == 0U) {
208 * Caller does not want service.
210 } else if ((flags & NI_NUMERICSERV) != 0 ||
211 (sp = getservbyport(port, proto)) == NULL) {
212 snprintf(numserv, sizeof(numserv), "%d", ntohs(port));
213 if ((strlen(numserv) + 1) > servlen)
215 strcpy(serv, numserv);
217 if ((strlen(sp->s_name) + 1) > servlen)
219 strcpy(serv, sp->s_name);
223 switch (sa->sa_family) {
225 v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
226 if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
227 flags |= NI_NUMERICHOST;
228 v4a >>= IN_CLASSA_NSHIFT;
229 if (v4a == 0 || v4a == IN_LOOPBACKNET)
230 flags |= NI_NUMERICHOST;
234 pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr[0];
235 if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
236 flags |= NI_NUMERICHOST;
241 if (host == NULL || hostlen == 0U) {
243 * do nothing in this case.
244 * in case you are wondering if "&&" is more correct than
245 * "||" here: RFC3493 says that host == NULL or hostlen == 0
246 * means that the caller does not want the result.
248 } else if ((flags & NI_NUMERICHOST) != 0) {
249 if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
252 #if defined(IRS_HAVE_SIN6_SCOPE_ID)
253 if (afd->a_af == AF_INET6 &&
254 ((const struct sockaddr_in6 *)sa)->sin6_scope_id) {
255 char *p = numaddr + strlen(numaddr);
256 const char *stringscope = NULL;
257 #ifdef VENDOR_SPECIFIC
259 * Vendors may want to add support for
260 * non-numeric scope identifier.
264 if (stringscope == NULL) {
265 snprintf(p, sizeof(numaddr) - (p - numaddr),
267 ((const struct sockaddr_in6 *)sa)->sin6_scope_id);
269 snprintf(p, sizeof(numaddr) - (p - numaddr),
270 "%%%s", stringscope);
274 if (strlen(numaddr) + 1 > hostlen)
276 strcpy(host, numaddr);
278 isc_netaddr_t netaddr;
279 dns_fixedname_t ptrfname;
281 irs_context_t *irsctx = NULL;
282 dns_client_t *client;
283 isc_boolean_t found = ISC_FALSE;
284 dns_namelist_t answerlist;
285 dns_rdataset_t *rdataset;
286 isc_region_t hostregion;
287 char hoststr[1024]; /* is this enough? */
288 isc_result_t iresult;
290 /* Get IRS context and the associated DNS client object */
291 iresult = irs_context_get(&irsctx);
292 if (iresult != ISC_R_SUCCESS)
294 client = irs_context_getdnsclient(irsctx);
296 /* Make query name */
297 isc_netaddr_fromsockaddr(&netaddr, (const isc_sockaddr_t *)sa);
298 dns_fixedname_init(&ptrfname);
299 ptrname = dns_fixedname_name(&ptrfname);
300 iresult = dns_byaddr_createptrname2(&netaddr, 0, ptrname);
301 if (iresult != ISC_R_SUCCESS)
304 /* Get the PTR RRset */
305 ISC_LIST_INIT(answerlist);
306 iresult = dns_client_resolve(client, ptrname,
309 DNS_CLIENTRESOPT_ALLOWRUN,
314 * a 'non-existent' error is not necessarily fatal for
317 case DNS_R_NCACHENXDOMAIN:
318 case DNS_R_NCACHENXRRSET:
320 case DNS_R_SIGINVALID:
321 case DNS_R_SIGEXPIRED:
322 case DNS_R_SIGFUTURE:
323 case DNS_R_KEYUNAUTHORIZED:
324 case DNS_R_MUSTBESECURE:
325 case DNS_R_COVERINGNSEC:
326 case DNS_R_NOTAUTHORITATIVE:
327 case DNS_R_NOVALIDKEY:
328 case DNS_R_NOVALIDDS:
329 case DNS_R_NOVALIDSIG:
330 ERR(EAI_INSECUREDATA);
335 /* Parse the answer for the hostname */
336 for (ptrname = ISC_LIST_HEAD(answerlist); ptrname != NULL;
337 ptrname = ISC_LIST_NEXT(ptrname, link)) {
338 for (rdataset = ISC_LIST_HEAD(ptrname->list);
340 rdataset = ISC_LIST_NEXT(rdataset, link)) {
341 if (!dns_rdataset_isassociated(rdataset))
343 if (rdataset->type != dns_rdatatype_ptr)
346 for (iresult = dns_rdataset_first(rdataset);
347 iresult == ISC_R_SUCCESS;
348 iresult = dns_rdataset_next(rdataset)) {
350 dns_rdata_ptr_t rdata_ptr;
353 dns_rdata_init(&rdata);
354 dns_rdataset_current(rdataset, &rdata);
355 dns_rdata_tostruct(&rdata, &rdata_ptr,
358 isc_buffer_init(&b, hoststr,
361 dns_name_totext(&rdata_ptr.ptr,
363 dns_rdata_freestruct(&rdata_ptr);
364 if (iresult == ISC_R_SUCCESS) {
366 * We ignore the rest of the
368 * getnameinfo() can return
369 * at most one hostname.
372 isc_buffer_usedregion(
381 dns_client_freeresanswer(client, &answerlist);
383 if ((flags & NI_NOFQDN) != 0) {
384 p = strchr(hoststr, '.');
388 if (hostregion.length + 1 > hostlen)
390 snprintf(host, hostlen, "%.*s",
391 (int)hostregion.length,
392 (char *)hostregion.base);
394 if ((flags & NI_NAMEREQD) != 0)
396 if (inet_ntop(afd->a_af, addr, numaddr,
397 sizeof(numaddr)) == NULL)
399 if ((strlen(numaddr) + 1) > hostlen)
401 strcpy(host, numaddr);