2 * Issues to be discussed:
3 * - Thread safe-ness must be checked
6 #if ( defined(__linux__) || defined(__linux) || defined(LINUX) )
9 # define IF_NAMESIZE IFNAMSIZ
11 # define IF_NAMESIZE 16
17 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
18 * All rights reserved.
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
28 * 3. All advertising materials mentioning features or use of this software
29 * must display the following acknowledgement:
30 * This product includes software developed by WIDE Project and
32 * 4. Neither the name of the project nor the names of its contributors
33 * may be used to endorse or promote products derived from this software
34 * without specific prior written permission.
36 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
39 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
49 #include <port_before.h>
51 #include <sys/types.h>
52 #include <sys/socket.h>
54 #include <netinet/in.h>
55 #include <arpa/nameser.h>
56 #include <arpa/inet.h>
64 #include <port_after.h>
67 * Note that a_off will be dynamically adjusted so that to be consistent
68 * with the definition of sockaddr_in{,6}.
69 * The value presented below is just a guess.
77 /* first entry is linked last... */
78 {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
79 offsetof(struct sockaddr_in, sin_addr)},
80 {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
81 offsetof(struct sockaddr_in6, sin6_addr)},
93 static int ip6_parsenumeric __P((const struct sockaddr *, const char *, char *,
95 #ifdef HAVE_SIN6_SCOPE_ID
96 static int ip6_sa2str __P((const struct sockaddr_in6 *, char *, size_t, int));
100 getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
101 const struct sockaddr *sa;
121 const struct sockaddr_in6 *sin6;
128 if (len != salen) return EAI_FAIL;
131 family = sa->sa_family;
132 for (i = 0; afdl[i].a_af; i++)
133 if (afdl[i].a_af == family) {
140 if (salen != afd->a_socklen) return EAI_FAIL;
142 port = ((const struct sockinet *)sa)->si_port; /*%< network byte order */
143 addr = (const char *)sa + afd->a_off;
145 if (serv == NULL || servlen == 0U) {
147 * rfc2553bis says that serv == NULL or servlen == 0 means that
148 * the caller does not want the result.
150 } else if (flags & NI_NUMERICSERV) {
151 sprintf(numserv, "%d", ntohs(port));
152 if (strlen(numserv) > servlen)
154 strcpy(serv, numserv);
156 sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp");
158 if (strlen(sp->s_name) + 1 > servlen)
160 strcpy(serv, sp->s_name);
165 switch (sa->sa_family) {
167 if (ntohl(*(const u_int32_t *)addr) >> IN_CLASSA_NSHIFT == 0)
168 flags |= NI_NUMERICHOST;
171 sin6 = (const struct sockaddr_in6 *)sa;
172 switch (sin6->sin6_addr.s6_addr[0]) {
174 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
176 else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
179 flags |= NI_NUMERICHOST;
182 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
183 flags |= NI_NUMERICHOST;
184 else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
185 flags |= NI_NUMERICHOST;
190 if (host == NULL || hostlen == 0U) {
192 * rfc2553bis says that host == NULL or hostlen == 0 means that
193 * the caller does not want the result.
195 } else if (flags & NI_NUMERICHOST) {
198 hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
201 if (flags & NI_NOFQDN) {
202 p = strchr(hp->h_name, '.');
205 if (strlen(hp->h_name) + 1 > hostlen)
207 strcpy(host, hp->h_name);
209 if (flags & NI_NAMEREQD)
217 if ((error = ip6_parsenumeric(sa, addr, host,
225 if (inet_ntop(afd->a_af, addr, numaddr,
226 sizeof(numaddr)) == NULL)
228 if (strlen(numaddr) + 1 > hostlen)
230 strcpy(host, numaddr);
238 ip6_parsenumeric(const struct sockaddr *sa, const char *addr, char *host,
239 size_t hostlen, int flags)
244 #ifndef HAVE_SIN6_SCOPE_ID
249 if (inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr))
253 numaddrlen = strlen(numaddr);
254 if (numaddrlen + 1 > hostlen) /*%< don't forget terminator */
256 strcpy(host, numaddr);
258 #ifdef HAVE_SIN6_SCOPE_ID
259 if (((const struct sockaddr_in6 *)sa)->sin6_scope_id) {
260 char scopebuf[MAXHOSTNAMELEN]; /*%< XXX */
263 /* ip6_sa2str never fails */
264 scopelen = ip6_sa2str((const struct sockaddr_in6 *)sa,
265 scopebuf, sizeof(scopebuf), flags);
267 if (scopelen + 1 + numaddrlen + 1 > hostlen)
270 /* construct <numeric-addr><delim><scopeid> */
271 memcpy(host + numaddrlen + 1, scopebuf,
273 host[numaddrlen] = SCOPE_DELIMITER;
274 host[numaddrlen + 1 + scopelen] = '\0';
281 #ifdef HAVE_SIN6_SCOPE_ID
284 ip6_sa2str(const struct sockaddr_in6 *sa6, char *buf,
285 size_t bufsiz, int flags)
287 #ifdef USE_IFNAMELINKID
288 unsigned int ifindex = (unsigned int)sa6->sin6_scope_id;
289 const struct in6_addr *a6 = &sa6->sin6_addr;
293 #ifdef NI_NUMERICSCOPE
294 if (flags & NI_NUMERICSCOPE) {
295 sprintf(tmp, "%u", sa6->sin6_scope_id);
297 strncpy(buf, tmp, bufsiz - 1);
298 buf[bufsiz - 1] = '\0';
304 #ifdef USE_IFNAMELINKID
306 * For a link-local address, convert the index to an interface
307 * name, assuming a one-to-one mapping between links and interfaces.
308 * Note, however, that this assumption is stronger than the
309 * specification of the scoped address architecture; the
310 * specficication says that more than one interfaces can belong to
314 /* if_indextoname() does not take buffer size. not a good api... */
315 if ((IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) &&
316 bufsiz >= IF_NAMESIZE) {
317 char *p = if_indextoname(ifindex, buf);
325 sprintf(tmp, "%u", sa6->sin6_scope_id);
327 strncpy(buf, tmp, bufsiz - 1);
328 buf[bufsiz - 1] = '\0';