source: trunk/server/source4/heimdal/lib/roken/getaddrinfo.c

Last change on this file was 745, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.0
File size: 10.5 KB
Line 
1/*
2 * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
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.
16 *
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.
20 *
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
31 * SUCH DAMAGE.
32 */
33
34#include <config.h>
35
36#include "roken.h"
37
38/*
39 * uses hints->ai_socktype and hints->ai_protocol
40 */
41
42static int
43get_port_protocol_socktype (const char *servname,
44 const struct addrinfo *hints,
45 int *port,
46 int *protocol,
47 int *socktype)
48{
49 struct servent *se;
50 const char *proto_str = NULL;
51
52 *socktype = 0;
53
54 if (hints != NULL && hints->ai_protocol != 0) {
55 struct protoent *protoent = getprotobynumber (hints->ai_protocol);
56
57 if (protoent == NULL)
58 return EAI_SOCKTYPE; /* XXX */
59
60 proto_str = protoent->p_name;
61 *protocol = protoent->p_proto;
62 }
63
64 if (hints != NULL)
65 *socktype = hints->ai_socktype;
66
67 if (*socktype == SOCK_STREAM) {
68 se = getservbyname (servname, proto_str ? proto_str : "tcp");
69 if (proto_str == NULL)
70 *protocol = IPPROTO_TCP;
71 } else if (*socktype == SOCK_DGRAM) {
72 se = getservbyname (servname, proto_str ? proto_str : "udp");
73 if (proto_str == NULL)
74 *protocol = IPPROTO_UDP;
75 } else if (*socktype == 0) {
76 if (proto_str != NULL) {
77 se = getservbyname (servname, proto_str);
78 } else {
79 se = getservbyname (servname, "tcp");
80 *protocol = IPPROTO_TCP;
81 *socktype = SOCK_STREAM;
82 if (se == NULL) {
83 se = getservbyname (servname, "udp");
84 *protocol = IPPROTO_UDP;
85 *socktype = SOCK_DGRAM;
86 }
87 }
88 } else
89 return EAI_SOCKTYPE;
90
91 if (se == NULL) {
92 char *endstr;
93
94 *port = htons(strtol (servname, &endstr, 10));
95 if (servname == endstr)
96 return EAI_NONAME;
97 } else {
98 *port = se->s_port;
99 }
100 return 0;
101}
102
103static int
104add_one (int port, int protocol, int socktype,
105 struct addrinfo ***ptr,
106 int (*func)(struct addrinfo *, void *data, int port),
107 void *data,
108 char *canonname)
109{
110 struct addrinfo *a;
111 int ret;
112
113 a = malloc (sizeof (*a));
114 if (a == NULL)
115 return EAI_MEMORY;
116 memset (a, 0, sizeof(*a));
117 a->ai_flags = 0;
118 a->ai_next = NULL;
119 a->ai_protocol = protocol;
120 a->ai_socktype = socktype;
121 a->ai_canonname = canonname;
122 ret = (*func)(a, data, port);
123 if (ret) {
124 free (a);
125 return ret;
126 }
127 **ptr = a;
128 *ptr = &a->ai_next;
129 return 0;
130}
131
132static int
133const_v4 (struct addrinfo *a, void *data, int port)
134{
135 struct sockaddr_in *sin4;
136 struct in_addr *addr = (struct in_addr *)data;
137
138 a->ai_family = PF_INET;
139 a->ai_addrlen = sizeof(*sin4);
140 a->ai_addr = malloc (sizeof(*sin4));
141 if (a->ai_addr == NULL)
142 return EAI_MEMORY;
143 sin4 = (struct sockaddr_in *)a->ai_addr;
144 memset (sin4, 0, sizeof(*sin4));
145 sin4->sin_family = AF_INET;
146 sin4->sin_port = port;
147 sin4->sin_addr = *addr;
148 return 0;
149}
150
151#ifdef HAVE_IPV6
152static int
153const_v6 (struct addrinfo *a, void *data, int port)
154{
155 struct sockaddr_in6 *sin6;
156 struct in6_addr *addr = (struct in6_addr *)data;
157
158 a->ai_family = PF_INET6;
159 a->ai_addrlen = sizeof(*sin6);
160 a->ai_addr = malloc (sizeof(*sin6));
161 if (a->ai_addr == NULL)
162 return EAI_MEMORY;
163 sin6 = (struct sockaddr_in6 *)a->ai_addr;
164 memset (sin6, 0, sizeof(*sin6));
165 sin6->sin6_family = AF_INET6;
166 sin6->sin6_port = port;
167 sin6->sin6_addr = *addr;
168 return 0;
169}
170#endif
171
172/* this is mostly a hack for some versions of AIX that has a prototype
173 for in6addr_loopback but no actual symbol in libc */
174#if defined(HAVE_IPV6) && !defined(HAVE_IN6ADDR_LOOPBACK) && defined(IN6ADDR_LOOPBACK_INIT)
175#define in6addr_loopback _roken_in6addr_loopback
176struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
177#endif
178
179static int
180get_null (const struct addrinfo *hints,
181 int port, int protocol, int socktype,
182 struct addrinfo **res)
183{
184 struct in_addr v4_addr;
185#ifdef HAVE_IPV6
186 struct in6_addr v6_addr;
187#endif
188 struct addrinfo *first = NULL;
189 struct addrinfo **current = &first;
190 int family = PF_UNSPEC;
191 int ret;
192
193 if (hints != NULL)
194 family = hints->ai_family;
195
196 if (hints && hints->ai_flags & AI_PASSIVE) {
197 v4_addr.s_addr = INADDR_ANY;
198#ifdef HAVE_IPV6
199 v6_addr = in6addr_any;
200#endif
201 } else {
202 v4_addr.s_addr = htonl(INADDR_LOOPBACK);
203#ifdef HAVE_IPV6
204 v6_addr = in6addr_loopback;
205#endif
206 }
207
208#ifdef HAVE_IPV6
209 if (family == PF_INET6 || family == PF_UNSPEC) {
210 ret = add_one (port, protocol, socktype,
211 &current, const_v6, &v6_addr, NULL);
212 }
213#endif
214 if (family == PF_INET || family == PF_UNSPEC) {
215 ret = add_one (port, protocol, socktype,
216 &current, const_v4, &v4_addr, NULL);
217 }
218 *res = first;
219 return 0;
220}
221
222static int
223add_hostent (int port, int protocol, int socktype,
224 struct addrinfo ***current,
225 int (*func)(struct addrinfo *, void *data, int port),
226 struct hostent *he, int *flags)
227{
228 int ret;
229 char *canonname = NULL;
230 char **h;
231
232 if (*flags & AI_CANONNAME) {
233 struct hostent *he2 = NULL;
234 const char *tmp_canon;
235
236 tmp_canon = hostent_find_fqdn (he);
237 if (strchr (tmp_canon, '.') == NULL) {
238 int error;
239
240 he2 = getipnodebyaddr (he->h_addr_list[0], he->h_length,
241 he->h_addrtype, &error);
242 if (he2 != NULL) {
243 const char *tmp = hostent_find_fqdn (he2);
244
245 if (strchr (tmp, '.') != NULL)
246 tmp_canon = tmp;
247 }
248 }
249
250 canonname = strdup (tmp_canon);
251 if (he2 != NULL)
252 freehostent (he2);
253 if (canonname == NULL)
254 return EAI_MEMORY;
255 }
256
257 for (h = he->h_addr_list; *h != NULL; ++h) {
258 ret = add_one (port, protocol, socktype,
259 current, func, *h, canonname);
260 if (ret)
261 return ret;
262 if (*flags & AI_CANONNAME) {
263 *flags &= ~AI_CANONNAME;
264 canonname = NULL;
265 }
266 }
267 return 0;
268}
269
270static int
271get_number (const char *nodename,
272 const struct addrinfo *hints,
273 int port, int protocol, int socktype,
274 struct addrinfo **res)
275{
276 struct addrinfo *first = NULL;
277 struct addrinfo **current = &first;
278 int family = PF_UNSPEC;
279 int ret;
280
281 if (hints != NULL) {
282 family = hints->ai_family;
283 }
284
285#ifdef HAVE_IPV6
286 if (family == PF_INET6 || family == PF_UNSPEC) {
287 struct in6_addr v6_addr;
288
289 if (inet_pton (PF_INET6, nodename, &v6_addr) == 1) {
290 ret = add_one (port, protocol, socktype,
291 &current, const_v6, &v6_addr, NULL);
292 *res = first;
293 return ret;
294 }
295 }
296#endif
297 if (family == PF_INET || family == PF_UNSPEC) {
298 struct in_addr v4_addr;
299
300 if (inet_pton (PF_INET, nodename, &v4_addr) == 1) {
301 ret = add_one (port, protocol, socktype,
302 &current, const_v4, &v4_addr, NULL);
303 *res = first;
304 return ret;
305 }
306 }
307 return EAI_NONAME;
308}
309
310static int
311get_nodes (const char *nodename,
312 const struct addrinfo *hints,
313 int port, int protocol, int socktype,
314 struct addrinfo **res)
315{
316 struct addrinfo *first = NULL;
317 struct addrinfo **current = &first;
318 int family = PF_UNSPEC;
319 int flags = 0;
320 int ret = EAI_NONAME;
321 int error;
322
323 if (hints != NULL) {
324 family = hints->ai_family;
325 flags = hints->ai_flags;
326 }
327
328#ifdef HAVE_IPV6
329 if (family == PF_INET6 || family == PF_UNSPEC) {
330 struct hostent *he;
331
332 he = getipnodebyname (nodename, PF_INET6, 0, &error);
333
334 if (he != NULL) {
335 ret = add_hostent (port, protocol, socktype,
336 &current, const_v6, he, &flags);
337 freehostent (he);
338 }
339 }
340#endif
341 if (family == PF_INET || family == PF_UNSPEC) {
342 struct hostent *he;
343
344 he = getipnodebyname (nodename, PF_INET, 0, &error);
345
346 if (he != NULL) {
347 ret = add_hostent (port, protocol, socktype,
348 &current, const_v4, he, &flags);
349 freehostent (he);
350 }
351 }
352 *res = first;
353 return ret;
354}
355
356/*
357 * hints:
358 *
359 * struct addrinfo {
360 * int ai_flags;
361 * int ai_family;
362 * int ai_socktype;
363 * int ai_protocol;
364 * ...
365 * };
366 */
367
368ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
369getaddrinfo(const char *nodename,
370 const char *servname,
371 const struct addrinfo *hints,
372 struct addrinfo **res)
373{
374 int ret;
375 int port = 0;
376 int protocol = 0;
377 int socktype = 0;
378
379 *res = NULL;
380
381 if (servname == NULL && nodename == NULL)
382 return EAI_NONAME;
383
384 if (hints != NULL
385 && hints->ai_family != PF_UNSPEC
386 && hints->ai_family != PF_INET
387#ifdef HAVE_IPV6
388 && hints->ai_family != PF_INET6
389#endif
390 )
391 return EAI_FAMILY;
392
393 if (servname != NULL) {
394 ret = get_port_protocol_socktype (servname, hints,
395 &port, &protocol, &socktype);
396 if (ret)
397 return ret;
398 }
399 if (nodename != NULL) {
400 ret = get_number (nodename, hints, port, protocol, socktype, res);
401 if (ret) {
402 if(hints && hints->ai_flags & AI_NUMERICHOST)
403 ret = EAI_NONAME;
404 else
405 ret = get_nodes (nodename, hints, port, protocol, socktype,
406 res);
407 }
408 } else {
409 ret = get_null (hints, port, protocol, socktype, res);
410 }
411 if (ret)
412 freeaddrinfo (*res);
413 return ret;
414}
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