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* Copyright 2009 Oracle. All rights reserved.
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* This file is part of nfs-utils.
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* nfs-utils is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* nfs-utils is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with nfs-utils. If not, see <http://www.gnu.org/licenses/>.
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#ifndef HAVE_DECL_AI_ADDRCONFIG
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#define AI_ADDRCONFIG 0
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* statd_present_address - convert sockaddr to presentation address
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* @sap: pointer to socket address to convert
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* @buf: pointer to buffer to fill in
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* @buflen: length of buffer
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* Convert the passed-in sockaddr-style address to presentation format.
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* The presentation format address is placed in @buf and is
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* Returns true if successful; otherwise false.
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* getnameinfo(3) is preferred, since it can parse IPv6 scope IDs.
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* An alternate version of statd_present_address() is available to
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* handle older glibcs that do not have getnameinfo(3).
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#ifdef HAVE_GETNAMEINFO
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statd_present_address(const struct sockaddr *sap, char *buf, const size_t buflen)
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salen = nfs_sockaddr_length(sap);
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xlog(D_GENERAL, "%s: unsupported address family",
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error = getnameinfo(sap, salen, buf, (socklen_t)buflen,
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NULL, 0, NI_NUMERICHOST);
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xlog(D_GENERAL, "%s: getnameinfo(3): %s",
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__func__, gai_strerror(error));
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#else /* !HAVE_GETNAMEINFO */
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statd_present_address(const struct sockaddr *sap, char *buf, const size_t buflen)
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const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
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if (sin->sin_family != AF_INET) {
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xlog(D_GENERAL, "%s: unsupported address family", __func__);
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/* ensure '\0' termination */
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memset(buf, 0, buflen);
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if (inet_ntop(AF_INET, (char *)&sin->sin_addr,
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buf, (socklen_t)buflen) == NULL) {
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xlog(D_GENERAL, "%s: inet_ntop(3): %m", __func__);
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#endif /* !HAVE_GETNAMEINFO */
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* Look up the hostname; report exceptional errors. Caller must
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* call freeaddrinfo(3) if a valid addrinfo is returned.
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static struct addrinfo *
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get_addrinfo(const char *hostname, const struct addrinfo *hint)
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struct addrinfo *ai = NULL;
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error = getaddrinfo(hostname, NULL, hint, &ai);
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xlog(D_GENERAL, "%s: failed to resolve host %s: %s",
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__func__, hostname, gai_strerror(error));
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#ifdef HAVE_GETNAMEINFO
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get_nameinfo(const struct sockaddr *sap, const socklen_t salen,
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/*@out@*/ char *buf, const socklen_t buflen)
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error = getnameinfo(sap, salen, buf, buflen, NULL, 0, NI_NAMEREQD);
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xlog(D_GENERAL, "%s: failed to resolve address: %s",
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__func__, gai_strerror(error));
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#else /* !HAVE_GETNAMEINFO */
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get_nameinfo(const struct sockaddr *sap,
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__attribute__ ((unused)) const socklen_t salen,
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/*@out@*/ char *buf, socklen_t buflen)
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struct sockaddr_in *sin = (struct sockaddr_in *)(char *)sap;
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if (sin->sin_family != AF_INET) {
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xlog(D_GENERAL, "%s: unknown address family: %d",
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hp = gethostbyaddr((const char *)&(sin->sin_addr.s_addr),
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sizeof(struct in_addr), AF_INET);
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xlog(D_GENERAL, "%s: failed to resolve address: %m", __func__);
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strncpy(buf, hp->h_name, (size_t)buflen);
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#endif /* !HAVE_GETNAMEINFO */
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* statd_canonical_name - choose file name for monitor record files
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* @hostname: C string containing hostname or presentation address
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* Returns a '\0'-terminated ASCII string containing a fully qualified
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* canonical hostname, or NULL if @hostname does not have a reverse
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* mapping. Caller must free the result with free(3).
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* Incoming hostnames are looked up to determine the canonical hostname,
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* and incoming presentation addresses are converted to canonical
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* We won't monitor peers that don't have a reverse map. The canonical
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* name gives us a key for our monitor list.
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statd_canonical_name(const char *hostname)
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struct addrinfo hint = {
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#ifdef IPV6_SUPPORTED
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.ai_family = AF_UNSPEC,
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#else /* !IPV6_SUPPORTED */
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.ai_family = AF_INET,
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#endif /* !IPV6_SUPPORTED */
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.ai_flags = AI_NUMERICHOST,
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.ai_protocol = (int)IPPROTO_UDP,
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char buf[NI_MAXHOST];
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ai = get_addrinfo(hostname, &hint);
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/* @hostname was a presentation address */
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result = get_nameinfo(ai->ai_addr, ai->ai_addrlen,
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buf, (socklen_t)sizeof(buf));
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/* @hostname was a hostname */
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hint.ai_flags = AI_CANONNAME;
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ai = get_addrinfo(hostname, &hint);
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strcpy(buf, ai->ai_canonname);
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* statd_matchhostname - check if two hostnames are equivalent
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* @hostname1: C string containing hostname
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* @hostname2: C string containing hostname
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* Returns true if the hostnames are the same, the hostnames resolve
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* to the same canonical name, or the hostnames resolve to at least
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* one address that is the same. False is returned if the hostnames
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* do not match in any of these ways, if either hostname contains
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* wildcard characters, if either hostname is a netgroup name, or
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* if an error occurs.
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statd_matchhostname(const char *hostname1, const char *hostname2)
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struct addrinfo *ai1, *ai2, *results1 = NULL, *results2 = NULL;
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struct addrinfo hint = {
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.ai_family = AF_UNSPEC,
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.ai_flags = AI_CANONNAME,
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.ai_protocol = (int)IPPROTO_UDP,
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_Bool result = false;
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if (strcasecmp(hostname1, hostname2) == 0) {
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results1 = get_addrinfo(hostname1, &hint);
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if (results1 == NULL)
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results2 = get_addrinfo(hostname2, &hint);
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if (results2 == NULL)
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if (strcasecmp(results1->ai_canonname, results2->ai_canonname) == 0) {
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for (ai1 = results1; ai1 != NULL; ai1 = ai1->ai_next)
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for (ai2 = results2; ai2 != NULL; ai2 = ai2->ai_next)
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if (nfs_compare_sockaddr(ai1->ai_addr, ai2->ai_addr)) {
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freeaddrinfo(results2);
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freeaddrinfo(results1);
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xlog(D_CALL, "%s: hostnames %s", __func__,
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(result ? "matched" : "did not match"));