2 * Copyright 2009 Oracle. All rights reserved.
4 * This file is part of nfs-utils.
6 * nfs-utils is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * nfs-utils is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with nfs-utils. If not, see <http://www.gnu.org/licenses/>.
28 #include <sys/types.h>
29 #include <sys/socket.h>
36 #include <arpa/inet.h>
42 #ifndef HAVE_DECL_AI_ADDRCONFIG
43 #define AI_ADDRCONFIG 0
47 * statd_present_address - convert sockaddr to presentation address
48 * @sap: pointer to socket address to convert
49 * @buf: pointer to buffer to fill in
50 * @buflen: length of buffer
52 * Convert the passed-in sockaddr-style address to presentation format.
53 * The presentation format address is placed in @buf and is
56 * Returns true if successful; otherwise false.
58 * getnameinfo(3) is preferred, since it can parse IPv6 scope IDs.
59 * An alternate version of statd_present_address() is available to
60 * handle older glibcs that do not have getnameinfo(3).
62 #ifdef HAVE_GETNAMEINFO
64 statd_present_address(const struct sockaddr *sap, char *buf, const size_t buflen)
69 salen = nfs_sockaddr_length(sap);
71 xlog(D_GENERAL, "%s: unsupported address family",
76 error = getnameinfo(sap, salen, buf, (socklen_t)buflen,
77 NULL, 0, NI_NUMERICHOST);
79 xlog(D_GENERAL, "%s: getnameinfo(3): %s",
80 __func__, gai_strerror(error));
85 #else /* !HAVE_GETNAMEINFO */
87 statd_present_address(const struct sockaddr *sap, char *buf, const size_t buflen)
89 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
91 if (sin->sin_family != AF_INET) {
92 xlog(D_GENERAL, "%s: unsupported address family", __func__);
96 /* ensure '\0' termination */
97 memset(buf, 0, buflen);
99 if (inet_ntop(AF_INET, (char *)&sin->sin_addr,
100 buf, (socklen_t)buflen) == NULL) {
101 xlog(D_GENERAL, "%s: inet_ntop(3): %m", __func__);
106 #endif /* !HAVE_GETNAMEINFO */
109 * Look up the hostname; report exceptional errors. Caller must
110 * call freeaddrinfo(3) if a valid addrinfo is returned.
113 static struct addrinfo *
114 get_addrinfo(const char *hostname, const struct addrinfo *hint)
116 struct addrinfo *ai = NULL;
119 error = getaddrinfo(hostname, NULL, hint, &ai);
126 xlog(D_GENERAL, "%s: failed to resolve host %s: %s",
127 __func__, hostname, gai_strerror(error));
133 #ifdef HAVE_GETNAMEINFO
135 get_nameinfo(const struct sockaddr *sap, const socklen_t salen,
136 /*@out@*/ char *buf, const socklen_t buflen)
140 error = getnameinfo(sap, salen, buf, buflen, NULL, 0, NI_NAMEREQD);
142 xlog(D_GENERAL, "%s: failed to resolve address: %s",
143 __func__, gai_strerror(error));
149 #else /* !HAVE_GETNAMEINFO */
151 get_nameinfo(const struct sockaddr *sap,
152 __attribute__ ((unused)) const socklen_t salen,
153 /*@out@*/ char *buf, socklen_t buflen)
155 struct sockaddr_in *sin = (struct sockaddr_in *)(char *)sap;
158 if (sin->sin_family != AF_INET) {
159 xlog(D_GENERAL, "%s: unknown address family: %d",
164 hp = gethostbyaddr((const char *)&(sin->sin_addr.s_addr),
165 sizeof(struct in_addr), AF_INET);
167 xlog(D_GENERAL, "%s: failed to resolve address: %m", __func__);
171 strncpy(buf, hp->h_name, (size_t)buflen);
174 #endif /* !HAVE_GETNAMEINFO */
177 * statd_canonical_name - choose file name for monitor record files
178 * @hostname: C string containing hostname or presentation address
180 * Returns a '\0'-terminated ASCII string containing a fully qualified
181 * canonical hostname, or NULL if @hostname does not have a reverse
182 * mapping. Caller must free the result with free(3).
184 * Incoming hostnames are looked up to determine the canonical hostname,
185 * and incoming presentation addresses are converted to canonical
188 * We won't monitor peers that don't have a reverse map. The canonical
189 * name gives us a key for our monitor list.
193 statd_canonical_name(const char *hostname)
195 struct addrinfo hint = {
196 #ifdef IPV6_SUPPORTED
197 .ai_family = AF_UNSPEC,
198 #else /* !IPV6_SUPPORTED */
199 .ai_family = AF_INET,
200 #endif /* !IPV6_SUPPORTED */
201 .ai_flags = AI_NUMERICHOST,
202 .ai_protocol = (int)IPPROTO_UDP,
204 char buf[NI_MAXHOST];
207 ai = get_addrinfo(hostname, &hint);
209 /* @hostname was a presentation address */
211 result = get_nameinfo(ai->ai_addr, ai->ai_addrlen,
212 buf, (socklen_t)sizeof(buf));
219 /* @hostname was a hostname */
220 hint.ai_flags = AI_CANONNAME;
221 ai = get_addrinfo(hostname, &hint);
224 strcpy(buf, ai->ai_canonname);
231 * statd_matchhostname - check if two hostnames are equivalent
232 * @hostname1: C string containing hostname
233 * @hostname2: C string containing hostname
235 * Returns true if the hostnames are the same, the hostnames resolve
236 * to the same canonical name, or the hostnames resolve to at least
237 * one address that is the same. False is returned if the hostnames
238 * do not match in any of these ways, if either hostname contains
239 * wildcard characters, if either hostname is a netgroup name, or
240 * if an error occurs.
243 statd_matchhostname(const char *hostname1, const char *hostname2)
245 struct addrinfo *ai1, *ai2, *results1 = NULL, *results2 = NULL;
246 struct addrinfo hint = {
247 .ai_family = AF_UNSPEC,
248 .ai_flags = AI_CANONNAME,
249 .ai_protocol = (int)IPPROTO_UDP,
251 _Bool result = false;
253 if (strcasecmp(hostname1, hostname2) == 0) {
258 results1 = get_addrinfo(hostname1, &hint);
259 if (results1 == NULL)
261 results2 = get_addrinfo(hostname2, &hint);
262 if (results2 == NULL)
265 if (strcasecmp(results1->ai_canonname, results2->ai_canonname) == 0) {
270 for (ai1 = results1; ai1 != NULL; ai1 = ai1->ai_next)
271 for (ai2 = results2; ai2 != NULL; ai2 = ai2->ai_next)
272 if (nfs_compare_sockaddr(ai1->ai_addr, ai2->ai_addr)) {
278 freeaddrinfo(results2);
279 freeaddrinfo(results1);
281 xlog(D_CALL, "%s: hostnames %s", __func__,
282 (result ? "matched" : "did not match"));