2 * Copyright (c) 1999 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 RCSID("$Id: getaddrinfo.c,v 1.6 1999/12/20 00:56:44 assar Exp $");
42 * uses hints->ai_socktype and hints->ai_protocol
46 get_port_protocol_socktype (const char *servname,
47 const struct addrinfo *hints,
53 const char *proto_str = NULL;
57 if (hints != NULL && hints->ai_protocol != 0) {
58 struct protoent *protoent = getprotobynumber (hints->ai_protocol);
61 return EAI_SOCKTYPE; /* XXX */
63 proto_str = protoent->p_name;
64 *protocol = protoent->p_proto;
68 *socktype = hints->ai_socktype;
70 if (*socktype == SOCK_STREAM) {
71 se = getservbyname (servname, proto_str ? proto_str : "tcp");
72 if (proto_str == NULL)
73 *protocol = IPPROTO_TCP;
74 } else if (*socktype == SOCK_DGRAM) {
75 se = getservbyname (servname, proto_str ? proto_str : "udp");
76 if (proto_str == NULL)
77 *protocol = IPPROTO_UDP;
78 } else if (*socktype == 0) {
79 if (proto_str != NULL) {
80 se = getservbyname (servname, proto_str);
82 se = getservbyname (servname, "tcp");
83 *protocol = IPPROTO_TCP;
84 *socktype = SOCK_STREAM;
86 se = getservbyname (servname, "udp");
87 *protocol = IPPROTO_UDP;
88 *socktype = SOCK_DGRAM;
97 *port = htons(strtol (servname, &endstr, 10));
98 if (servname == endstr)
107 add_one (int port, int protocol, int socktype,
108 struct addrinfo ***ptr,
109 int (*func)(struct addrinfo *, void *data, int port),
116 a = malloc (sizeof (*a));
119 memset (a, 0, sizeof(*a));
122 a->ai_protocol = protocol;
123 a->ai_socktype = socktype;
124 a->ai_canonname = canonname;
125 ret = (*func)(a, data, port);
136 const_v4 (struct addrinfo *a, void *data, int port)
138 struct sockaddr_in *sin;
139 struct in_addr *addr = (struct in_addr *)data;
141 a->ai_family = PF_INET;
142 a->ai_addrlen = sizeof(*sin);
143 a->ai_addr = malloc (sizeof(*sin));
144 if (a->ai_addr == NULL)
146 sin = (struct sockaddr_in *)a->ai_addr;
147 memset (sin, 0, sizeof(*sin));
148 sin->sin_family = AF_INET;
149 sin->sin_port = port;
150 sin->sin_addr = *addr;
156 const_v6 (struct addrinfo *a, void *data, int port)
158 struct sockaddr_in6 *sin6;
159 struct in6_addr *addr = (struct in6_addr *)data;
161 a->ai_family = PF_INET6;
162 a->ai_addrlen = sizeof(*sin6);
163 a->ai_addr = malloc (sizeof(*sin6));
164 if (a->ai_addr == NULL)
166 sin6 = (struct sockaddr_in6 *)a->ai_addr;
167 memset (sin6, 0, sizeof(*sin6));
168 sin6->sin6_family = AF_INET6;
169 sin6->sin6_port = port;
170 sin6->sin6_addr = *addr;
176 get_null (const struct addrinfo *hints,
177 int port, int protocol, int socktype,
178 struct addrinfo **res)
180 struct in_addr v4_addr;
182 struct in6_addr v6_addr;
184 struct addrinfo *first = NULL;
185 struct addrinfo **current = &first;
186 int family = PF_UNSPEC;
190 family = hints->ai_family;
192 if (hints && hints->ai_flags & AI_PASSIVE) {
193 v4_addr.s_addr = INADDR_ANY;
195 v6_addr = in6addr_any;
198 v4_addr.s_addr = htonl(INADDR_LOOPBACK);
200 v6_addr = in6addr_loopback;
205 if (family == PF_INET6 || family == PF_UNSPEC) {
206 ret = add_one (port, protocol, socktype,
207 ¤t, const_v6, &v6_addr, NULL);
210 if (family == PF_INET || family == PF_UNSPEC) {
211 ret = add_one (port, protocol, socktype,
212 ¤t, const_v4, &v4_addr, NULL);
219 add_hostent (int port, int protocol, int socktype,
220 struct addrinfo ***current,
221 int (*func)(struct addrinfo *, void *data, int port),
222 struct hostent *he, int *flags)
226 char *canonname = NULL;
228 if (*flags & AI_CANONNAME) {
229 canonname = he->h_name;
231 if (strchr (he->h_name, '.') == NULL)
232 for (h = he->h_aliases; *h; ++h) {
233 if (strchr (*h, '.') != NULL) {
238 canonname = strdup (canonname);
239 if (canonname == NULL)
243 for (h = he->h_addr_list; *h != NULL; ++h) {
244 ret = add_one (port, protocol, socktype,
245 current, func, *h, canonname);
248 if (*flags & AI_CANONNAME) {
249 *flags &= ~AI_CANONNAME;
257 get_number (const char *nodename,
258 const struct addrinfo *hints,
259 int port, int protocol, int socktype,
260 struct addrinfo **res)
262 struct addrinfo *first = NULL;
263 struct addrinfo **current = &first;
264 int family = PF_UNSPEC;
268 family = hints->ai_family;
272 if (family == PF_INET6 || family == PF_UNSPEC) {
273 struct in6_addr v6_addr;
275 if (inet_pton (PF_INET6, nodename, &v6_addr) == 1) {
276 ret = add_one (port, protocol, socktype,
277 ¤t, const_v6, &v6_addr, NULL);
283 if (family == PF_INET || family == PF_UNSPEC) {
284 struct in_addr v4_addr;
286 if (inet_pton (PF_INET, nodename, &v4_addr) == 1) {
287 ret = add_one (port, protocol, socktype,
288 ¤t, const_v4, &v4_addr, NULL);
297 get_nodes (const char *nodename,
298 const struct addrinfo *hints,
299 int port, int protocol, int socktype,
300 struct addrinfo **res)
302 struct addrinfo *first = NULL;
303 struct addrinfo **current = &first;
304 int family = PF_UNSPEC;
306 int ret = EAI_NONAME;
310 family = hints->ai_family;
311 flags = hints->ai_flags;
315 if (family == PF_INET6 || family == PF_UNSPEC) {
318 he = getipnodebyname (nodename, PF_INET6, 0, &error);
321 ret = add_hostent (port, protocol, socktype,
322 ¤t, const_v6, he, &flags);
327 if (family == PF_INET || family == PF_UNSPEC) {
330 he = getipnodebyname (nodename, PF_INET, 0, &error);
333 ret = add_hostent (port, protocol, socktype,
334 ¤t, const_v4, he, &flags);
355 getaddrinfo(const char *nodename,
356 const char *servname,
357 const struct addrinfo *hints,
358 struct addrinfo **res)
367 if (servname == NULL && nodename == NULL)
371 && hints->ai_family != PF_UNSPEC
372 && hints->ai_family != PF_INET
374 && hints->ai_family != PF_INET6
379 if (servname != NULL) {
380 ret = get_port_protocol_socktype (servname, hints,
381 &port, &protocol, &socktype);
385 if (nodename != NULL) {
386 ret = get_number (nodename, hints, port, protocol, socktype, res);
388 if(hints && hints->ai_flags & AI_NUMERICHOST)
391 ret = get_nodes (nodename, hints, port, protocol, socktype,
395 ret = get_null (hints, port, protocol, socktype, res);