getnameinfo.c revision d7201de09b85929a86b157f4b2d91667c68c6b52
d7201de09b85929a86b157f4b2d91667c68c6b52Automatic Updater * Copyright (C) 2009 Internet Systems Consortium, Inc. ("ISC")
d7201de09b85929a86b157f4b2d91667c68c6b52Automatic Updater * Permission to use, copy, modify, and/or distribute this software for any
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * purpose with or without fee is hereby granted, provided that the above
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * copyright notice and this permission notice appear in all copies.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * PERFORMANCE OF THIS SOFTWARE.
d7201de09b85929a86b157f4b2d91667c68c6b52Automatic Updater/* $Id: getnameinfo.c,v 1.4 2009/09/02 23:48:02 tbox Exp $ */
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * All rights reserved.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * Redistribution and use in source and binary forms, with or without
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * modification, are permitted provided that the following conditions
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * 1. Redistributions of source code must retain the above copyright
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * notice, this list of conditions and the following disclaimer.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * 2. Redistributions in binary form must reproduce the above copyright
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * notice, this list of conditions and the following disclaimer in the
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * documentation and/or other materials provided with the distribution.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * 3. Neither the name of the project nor the names of its contributors
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * may be used to endorse or promote products derived from this software
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * without specific prior written permission.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * SUCH DAMAGE.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * getnameinfo() returns the hostname for the struct sockaddr sa which is
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * salen bytes long. The hostname is of length hostlen and is returned via
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * *host. The maximum length of the hostname is 1025 bytes: #NI_MAXHOST.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * The name of the service associated with the port number in sa is
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * returned in *serv. It is servlen bytes long. The maximum length of the
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * service name is #NI_MAXSERV - 32 bytes.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * The flags argument sets the following bits:
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * \li #NI_NOFQDN:
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * A fully qualified domain name is not required for local hosts.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * The local part of the fully qualified domain name is returned
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * \li #NI_NUMERICHOST
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * Return the address in numeric form, as if calling inet_ntop(),
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * instead of a host name.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * \li #NI_NAMEREQD
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * A name is required. If the hostname cannot be found in the DNS
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * and this flag is set, a non-zero error code is returned. If the
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * hostname is not found and the flag is not set, the address is
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * returned in numeric form.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * \li #NI_NUMERICSERV
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * The service name is returned as a digit string representing the
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * port number.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * \li #NI_DGRAM
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * Specifies that the service being looked up is a datagram
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * service, and causes getservbyport() to be called with a second
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * argument of "udp" instead of its default of "tcp". This is
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * required for the few ports (512-514) that have different
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * services for UDP and TCP.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * \section getnameinfo_return Return Values
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * getnameinfo() returns 0 on success or a non-zero error code if
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * an error occurs.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * \section getname_see See Also
d7201de09b85929a86b157f4b2d91667c68c6b52Automatic Updater * RFC3493, getservbyport(),
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * getnamebyaddr(). inet_ntop().
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉/*% afd structure definition */
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉static struct afd {
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * First entry is linked last...
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 { AF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in) },
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 { AF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6) },
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * The test against 0 is there to keep the Solaris compiler
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * from complaining about "end-of-loop code not reached".
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉getnameinfo(const struct sockaddr *sa, socklen_t salen, char *host,
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 IRS_GETNAMEINFO_BUFLEN_T hostlen, char *serv,
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 IRS_GETNAMEINFO_BUFLEN_T servlen, IRS_GETNAMEINFO_FLAGS_T flags)
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 unsigned short port;
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 unsigned long v4a;
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 unsigned char pfx;
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 char numaddr[sizeof("abcd:abcd:abcd:abcd:abcd:abcd:255.255.255.255")
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 port = ((const struct sockaddr_in *)sa)->sin_port;
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 addr = &((const struct sockaddr_in *)sa)->sin_addr.s_addr;
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 port = ((const struct sockaddr_in6 *)sa)->sin6_port;
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 addr = ((const struct sockaddr_in6 *)sa)->sin6_addr.s6_addr;
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 proto = (flags & NI_DGRAM) ? "udp" : "tcp";
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * Caller does not want service.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 } else if ((flags & NI_NUMERICSERV) != 0 ||
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 (sp = getservbyport(port, proto)) == NULL) {
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 snprintf(numserv, sizeof(numserv), "%d", ntohs(port));
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr[0];
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * do nothing in this case.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * in case you are wondering if "&&" is more correct than
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * "||" here: RFC3493 says that host == NULL or hostlen == 0
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * means that the caller does not want the result.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 } else if ((flags & NI_NUMERICHOST) != 0) {
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 ((const struct sockaddr_in6 *)sa)->sin6_scope_id) {
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * Vendors may want to add support for
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * non-numeric scope identifier.
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 snprintf(p, sizeof(numaddr) - (p - numaddr),
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 ((const struct sockaddr_in6 *)sa)->sin6_scope_id);
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 snprintf(p, sizeof(numaddr) - (p - numaddr),
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 char hoststr[1024]; /* is this enough? */
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 /* Get IRS context and the associated DNS client object */
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 client = irs_context_getdnsclient(irsctx);
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 /* Make query name */
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 isc_netaddr_fromsockaddr(&netaddr, (const isc_sockaddr_t *)sa);
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 iresult = dns_byaddr_createptrname2(&netaddr, 0, ptrname);
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 /* Get the PTR RRset */
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 iresult = dns_client_resolve(client, ptrname,
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * a 'non-existent' error is not necessarily fatal for
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * getnameinfo().
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 /* Parse the answer for the hostname */
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 for (ptrname = ISC_LIST_HEAD(answerlist); ptrname != NULL;
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 ptrname = ISC_LIST_NEXT(ptrname, link)) {
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 for (rdataset = ISC_LIST_HEAD(ptrname->list);
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 rdataset = ISC_LIST_NEXT(rdataset, link)) {
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 if (!dns_rdataset_isassociated(rdataset))
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 for (iresult = dns_rdataset_first(rdataset);
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * We ignore the rest of the
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * answer. After all,
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * getnameinfo() can return
307d2084502eddc7ce921e5ce439aec3531d90e0Tatuya JINMEI 神明達哉 * at most one hostname.