1 /* $NetBSD: getaddrinfo.c,v 1.1.1.1 2011/04/13 18:15:41 elric Exp $ */
2
3 /*
4 * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <config.h>
37
38 #include <krb5/roken.h>
39
40 /*
41 * uses hints->ai_socktype and hints->ai_protocol
42 */
43
44 static int
get_port_protocol_socktype(const char * servname,const struct addrinfo * hints,int * port,int * protocol,int * socktype)45 get_port_protocol_socktype (const char *servname,
46 const struct addrinfo *hints,
47 int *port,
48 int *protocol,
49 int *socktype)
50 {
51 struct servent *se;
52 const char *proto_str = NULL;
53
54 *socktype = 0;
55
56 if (hints != NULL && hints->ai_protocol != 0) {
57 struct protoent *protoent = getprotobynumber (hints->ai_protocol);
58
59 if (protoent == NULL)
60 return EAI_SOCKTYPE; /* XXX */
61
62 proto_str = protoent->p_name;
63 *protocol = protoent->p_proto;
64 }
65
66 if (hints != NULL)
67 *socktype = hints->ai_socktype;
68
69 if (*socktype == SOCK_STREAM) {
70 se = getservbyname (servname, proto_str ? proto_str : "tcp");
71 if (proto_str == NULL)
72 *protocol = IPPROTO_TCP;
73 } else if (*socktype == SOCK_DGRAM) {
74 se = getservbyname (servname, proto_str ? proto_str : "udp");
75 if (proto_str == NULL)
76 *protocol = IPPROTO_UDP;
77 } else if (*socktype == 0) {
78 if (proto_str != NULL) {
79 se = getservbyname (servname, proto_str);
80 } else {
81 se = getservbyname (servname, "tcp");
82 *protocol = IPPROTO_TCP;
83 *socktype = SOCK_STREAM;
84 if (se == NULL) {
85 se = getservbyname (servname, "udp");
86 *protocol = IPPROTO_UDP;
87 *socktype = SOCK_DGRAM;
88 }
89 }
90 } else
91 return EAI_SOCKTYPE;
92
93 if (se == NULL) {
94 char *endstr;
95
96 *port = htons(strtol (servname, &endstr, 10));
97 if (servname == endstr)
98 return EAI_NONAME;
99 } else {
100 *port = se->s_port;
101 }
102 return 0;
103 }
104
105 static int
add_one(int port,int protocol,int socktype,struct addrinfo *** ptr,int (* func)(struct addrinfo *,void * data,int port),void * data,char * canonname)106 add_one (int port, int protocol, int socktype,
107 struct addrinfo ***ptr,
108 int (*func)(struct addrinfo *, void *data, int port),
109 void *data,
110 char *canonname)
111 {
112 struct addrinfo *a;
113 int ret;
114
115 a = malloc (sizeof (*a));
116 if (a == NULL)
117 return EAI_MEMORY;
118 memset (a, 0, sizeof(*a));
119 a->ai_flags = 0;
120 a->ai_next = NULL;
121 a->ai_protocol = protocol;
122 a->ai_socktype = socktype;
123 a->ai_canonname = canonname;
124 ret = (*func)(a, data, port);
125 if (ret) {
126 free (a);
127 return ret;
128 }
129 **ptr = a;
130 *ptr = &a->ai_next;
131 return 0;
132 }
133
134 static int
const_v4(struct addrinfo * a,void * data,int port)135 const_v4 (struct addrinfo *a, void *data, int port)
136 {
137 struct sockaddr_in *sin4;
138 struct in_addr *addr = (struct in_addr *)data;
139
140 a->ai_family = PF_INET;
141 a->ai_addrlen = sizeof(*sin4);
142 a->ai_addr = malloc (sizeof(*sin4));
143 if (a->ai_addr == NULL)
144 return EAI_MEMORY;
145 sin4 = (struct sockaddr_in *)a->ai_addr;
146 memset (sin4, 0, sizeof(*sin4));
147 sin4->sin_family = AF_INET;
148 sin4->sin_port = port;
149 sin4->sin_addr = *addr;
150 return 0;
151 }
152
153 #ifdef HAVE_IPV6
154 static int
const_v6(struct addrinfo * a,void * data,int port)155 const_v6 (struct addrinfo *a, void *data, int port)
156 {
157 struct sockaddr_in6 *sin6;
158 struct in6_addr *addr = (struct in6_addr *)data;
159
160 a->ai_family = PF_INET6;
161 a->ai_addrlen = sizeof(*sin6);
162 a->ai_addr = malloc (sizeof(*sin6));
163 if (a->ai_addr == NULL)
164 return EAI_MEMORY;
165 sin6 = (struct sockaddr_in6 *)a->ai_addr;
166 memset (sin6, 0, sizeof(*sin6));
167 sin6->sin6_family = AF_INET6;
168 sin6->sin6_port = port;
169 sin6->sin6_addr = *addr;
170 return 0;
171 }
172 #endif
173
174 /* this is mostly a hack for some versions of AIX that has a prototype
175 for in6addr_loopback but no actual symbol in libc */
176 #if defined(HAVE_IPV6) && !defined(HAVE_IN6ADDR_LOOPBACK) && defined(IN6ADDR_LOOPBACK_INIT)
177 #define in6addr_loopback _roken_in6addr_loopback
178 struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
179 #endif
180
181 static int
get_null(const struct addrinfo * hints,int port,int protocol,int socktype,struct addrinfo ** res)182 get_null (const struct addrinfo *hints,
183 int port, int protocol, int socktype,
184 struct addrinfo **res)
185 {
186 struct in_addr v4_addr;
187 #ifdef HAVE_IPV6
188 struct in6_addr v6_addr;
189 #endif
190 struct addrinfo *first = NULL;
191 struct addrinfo **current = &first;
192 int family = PF_UNSPEC;
193 int ret;
194
195 if (hints != NULL)
196 family = hints->ai_family;
197
198 if (hints && hints->ai_flags & AI_PASSIVE) {
199 v4_addr.s_addr = INADDR_ANY;
200 #ifdef HAVE_IPV6
201 v6_addr = in6addr_any;
202 #endif
203 } else {
204 v4_addr.s_addr = htonl(INADDR_LOOPBACK);
205 #ifdef HAVE_IPV6
206 v6_addr = in6addr_loopback;
207 #endif
208 }
209
210 #ifdef HAVE_IPV6
211 if (family == PF_INET6 || family == PF_UNSPEC) {
212 ret = add_one (port, protocol, socktype,
213 ¤t, const_v6, &v6_addr, NULL);
214 }
215 #endif
216 if (family == PF_INET || family == PF_UNSPEC) {
217 ret = add_one (port, protocol, socktype,
218 ¤t, const_v4, &v4_addr, NULL);
219 }
220 *res = first;
221 return 0;
222 }
223
224 static int
add_hostent(int port,int protocol,int socktype,struct addrinfo *** current,int (* func)(struct addrinfo *,void * data,int port),struct hostent * he,int * flags)225 add_hostent (int port, int protocol, int socktype,
226 struct addrinfo ***current,
227 int (*func)(struct addrinfo *, void *data, int port),
228 struct hostent *he, int *flags)
229 {
230 int ret;
231 char *canonname = NULL;
232 char **h;
233
234 if (*flags & AI_CANONNAME) {
235 struct hostent *he2 = NULL;
236 const char *tmp_canon;
237
238 tmp_canon = hostent_find_fqdn (he);
239 if (strchr (tmp_canon, '.') == NULL) {
240 int error;
241
242 he2 = getipnodebyaddr (he->h_addr_list[0], he->h_length,
243 he->h_addrtype, &error);
244 if (he2 != NULL) {
245 const char *tmp = hostent_find_fqdn (he2);
246
247 if (strchr (tmp, '.') != NULL)
248 tmp_canon = tmp;
249 }
250 }
251
252 canonname = strdup (tmp_canon);
253 if (he2 != NULL)
254 freehostent (he2);
255 if (canonname == NULL)
256 return EAI_MEMORY;
257 }
258
259 for (h = he->h_addr_list; *h != NULL; ++h) {
260 ret = add_one (port, protocol, socktype,
261 current, func, *h, canonname);
262 if (ret)
263 return ret;
264 if (*flags & AI_CANONNAME) {
265 *flags &= ~AI_CANONNAME;
266 canonname = NULL;
267 }
268 }
269 return 0;
270 }
271
272 static int
get_number(const char * nodename,const struct addrinfo * hints,int port,int protocol,int socktype,struct addrinfo ** res)273 get_number (const char *nodename,
274 const struct addrinfo *hints,
275 int port, int protocol, int socktype,
276 struct addrinfo **res)
277 {
278 struct addrinfo *first = NULL;
279 struct addrinfo **current = &first;
280 int family = PF_UNSPEC;
281 int ret;
282
283 if (hints != NULL) {
284 family = hints->ai_family;
285 }
286
287 #ifdef HAVE_IPV6
288 if (family == PF_INET6 || family == PF_UNSPEC) {
289 struct in6_addr v6_addr;
290
291 if (inet_pton (PF_INET6, nodename, &v6_addr) == 1) {
292 ret = add_one (port, protocol, socktype,
293 ¤t, const_v6, &v6_addr, NULL);
294 *res = first;
295 return ret;
296 }
297 }
298 #endif
299 if (family == PF_INET || family == PF_UNSPEC) {
300 struct in_addr v4_addr;
301
302 if (inet_pton (PF_INET, nodename, &v4_addr) == 1) {
303 ret = add_one (port, protocol, socktype,
304 ¤t, const_v4, &v4_addr, NULL);
305 *res = first;
306 return ret;
307 }
308 }
309 return EAI_NONAME;
310 }
311
312 static int
get_nodes(const char * nodename,const struct addrinfo * hints,int port,int protocol,int socktype,struct addrinfo ** res)313 get_nodes (const char *nodename,
314 const struct addrinfo *hints,
315 int port, int protocol, int socktype,
316 struct addrinfo **res)
317 {
318 struct addrinfo *first = NULL;
319 struct addrinfo **current = &first;
320 int family = PF_UNSPEC;
321 int flags = 0;
322 int ret = EAI_NONAME;
323 int error;
324
325 if (hints != NULL) {
326 family = hints->ai_family;
327 flags = hints->ai_flags;
328 }
329
330 #ifdef HAVE_IPV6
331 if (family == PF_INET6 || family == PF_UNSPEC) {
332 struct hostent *he;
333
334 he = getipnodebyname (nodename, PF_INET6, 0, &error);
335
336 if (he != NULL) {
337 ret = add_hostent (port, protocol, socktype,
338 ¤t, const_v6, he, &flags);
339 freehostent (he);
340 }
341 }
342 #endif
343 if (family == PF_INET || family == PF_UNSPEC) {
344 struct hostent *he;
345
346 he = getipnodebyname (nodename, PF_INET, 0, &error);
347
348 if (he != NULL) {
349 ret = add_hostent (port, protocol, socktype,
350 ¤t, const_v4, he, &flags);
351 freehostent (he);
352 }
353 }
354 *res = first;
355 return ret;
356 }
357
358 /*
359 * hints:
360 *
361 * struct addrinfo {
362 * int ai_flags;
363 * int ai_family;
364 * int ai_socktype;
365 * int ai_protocol;
366 * ...
367 * };
368 */
369
370 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
getaddrinfo(const char * nodename,const char * servname,const struct addrinfo * hints,struct addrinfo ** res)371 getaddrinfo(const char *nodename,
372 const char *servname,
373 const struct addrinfo *hints,
374 struct addrinfo **res)
375 {
376 int ret;
377 int port = 0;
378 int protocol = 0;
379 int socktype = 0;
380
381 *res = NULL;
382
383 if (servname == NULL && nodename == NULL)
384 return EAI_NONAME;
385
386 if (hints != NULL
387 && hints->ai_family != PF_UNSPEC
388 && hints->ai_family != PF_INET
389 #ifdef HAVE_IPV6
390 && hints->ai_family != PF_INET6
391 #endif
392 )
393 return EAI_FAMILY;
394
395 if (servname != NULL) {
396 ret = get_port_protocol_socktype (servname, hints,
397 &port, &protocol, &socktype);
398 if (ret)
399 return ret;
400 }
401 if (nodename != NULL) {
402 ret = get_number (nodename, hints, port, protocol, socktype, res);
403 if (ret) {
404 if(hints && hints->ai_flags & AI_NUMERICHOST)
405 ret = EAI_NONAME;
406 else
407 ret = get_nodes (nodename, hints, port, protocol, socktype,
408 res);
409 }
410 } else {
411 ret = get_null (hints, port, protocol, socktype, res);
412 }
413 if (ret)
414 freeaddrinfo (*res);
415 return ret;
416 }
417