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-rw-r--r--gl/getaddrinfo.c417
1 files changed, 417 insertions, 0 deletions
diff --git a/gl/getaddrinfo.c b/gl/getaddrinfo.c
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1/* Get address information (partial implementation).
2 Copyright (C) 1997, 2001, 2002, 2004, 2005, 2006 Free Software
3 Foundation, Inc.
4 Contributed by Simon Josefsson <simon@josefsson.org>.
5
6 This program 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, or (at your option)
9 any later version.
10
11 This program 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.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
19
20#include <config.h>
21
22#include "getaddrinfo.h"
23
24#if HAVE_NETINET_IN_H
25# include <netinet/in.h>
26#endif
27
28/* Get calloc. */
29#include <stdlib.h>
30
31/* Get memcpy. */
32#include <string.h>
33
34#include <stdbool.h>
35
36#include "gettext.h"
37#define _(String) gettext (String)
38#define N_(String) String
39
40#include "inet_ntop.h"
41#include "snprintf.h"
42#include "strdup.h"
43
44/* BeOS has AF_INET, but not PF_INET. */
45#ifndef PF_INET
46# define PF_INET AF_INET
47#endif
48/* BeOS also lacks PF_UNSPEC. */
49#ifndef PF_UNSPEC
50# define PF_UNSPEC 0
51#endif
52
53#if defined _WIN32 || defined __WIN32__
54# define WIN32_NATIVE
55#endif
56
57#ifdef WIN32_NATIVE
58typedef int (WSAAPI *getaddrinfo_func) (const char*, const char*,
59 const struct addrinfo*,
60 struct addrinfo**);
61typedef void (WSAAPI *freeaddrinfo_func) (struct addrinfo*);
62typedef int (WSAAPI *getnameinfo_func) (const struct sockaddr*,
63 socklen_t, char*, DWORD,
64 char*, DWORD, int);
65
66static getaddrinfo_func getaddrinfo_ptr = NULL;
67static freeaddrinfo_func freeaddrinfo_ptr = NULL;
68static getnameinfo_func getnameinfo_ptr = NULL;
69
70static int
71use_win32_p (void)
72{
73 static int done = 0;
74 HMODULE h;
75
76 if (done)
77 return getaddrinfo_ptr ? 1 : 0;
78
79 done = 1;
80
81 h = GetModuleHandle ("ws2_32.dll");
82
83 if (h)
84 {
85 getaddrinfo_ptr = (getaddrinfo_func) GetProcAddress (h, "getaddrinfo");
86 freeaddrinfo_ptr = (freeaddrinfo_func) GetProcAddress (h, "freeaddrinfo");
87 getnameinfo_ptr = (getnameinfo_func) GetProcAddress (h, "getnameinfo");
88 }
89
90 /* If either is missing, something is odd. */
91 if (!getaddrinfo_ptr || !freeaddrinfo_ptr || !getnameinfo_ptr)
92 {
93 getaddrinfo_ptr = NULL;
94 freeaddrinfo_ptr = NULL;
95 getnameinfo_ptr = NULL;
96 return 0;
97 }
98
99 return 1;
100}
101#endif
102
103static inline bool
104validate_family (int family)
105{
106 /* FIXME: Support more families. */
107#if HAVE_IPV4
108 if (family == PF_INET)
109 return true;
110#endif
111#if HAVE_IPV6
112 if (family == PF_INET6)
113 return true;
114#endif
115 if (family == PF_UNSPEC)
116 return true;
117 return false;
118}
119
120/* Translate name of a service location and/or a service name to set of
121 socket addresses. */
122int
123getaddrinfo (const char *restrict nodename,
124 const char *restrict servname,
125 const struct addrinfo *restrict hints,
126 struct addrinfo **restrict res)
127{
128 struct addrinfo *tmp;
129 int port = 0;
130 struct hostent *he;
131 void *storage;
132 size_t size;
133#if HAVE_IPV6
134 struct v6_pair {
135 struct addrinfo addrinfo;
136 struct sockaddr_in6 sockaddr_in6;
137 };
138#endif
139#if HAVE_IPV4
140 struct v4_pair {
141 struct addrinfo addrinfo;
142 struct sockaddr_in sockaddr_in;
143 };
144#endif
145
146#ifdef WIN32_NATIVE
147 if (use_win32_p ())
148 return getaddrinfo_ptr (nodename, servname, hints, res);
149#endif
150
151 if (hints && (hints->ai_flags & ~(AI_CANONNAME|AI_PASSIVE)))
152 /* FIXME: Support more flags. */
153 return EAI_BADFLAGS;
154
155 if (hints && !validate_family (hints->ai_family))
156 return EAI_FAMILY;
157
158 if (hints &&
159 hints->ai_socktype != SOCK_STREAM && hints->ai_socktype != SOCK_DGRAM)
160 /* FIXME: Support other socktype. */
161 return EAI_SOCKTYPE; /* FIXME: Better return code? */
162
163 if (!nodename)
164 {
165 if (!(hints->ai_flags & AI_PASSIVE))
166 return EAI_NONAME;
167
168#ifdef HAVE_IPV6
169 nodename = (hints->ai_family == AF_INET6) ? "::" : "0.0.0.0";
170#else
171 nodename = "0.0.0.0";
172#endif
173 }
174
175 if (servname)
176 {
177 struct servent *se = NULL;
178 const char *proto =
179 (hints && hints->ai_socktype == SOCK_DGRAM) ? "udp" : "tcp";
180
181 if (!(hints->ai_flags & AI_NUMERICSERV))
182 /* FIXME: Use getservbyname_r if available. */
183 se = getservbyname (servname, proto);
184
185 if (!se)
186 {
187 char *c;
188 if (!(*servname >= '0' && *servname <= '9'))
189 return EAI_NONAME;
190 port = strtoul (servname, &c, 10);
191 if (*c || port > 0xffff)
192 return EAI_NONAME;
193 port = htons (port);
194 }
195 else
196 port = se->s_port;
197 }
198
199 /* FIXME: Use gethostbyname_r if available. */
200 he = gethostbyname (nodename);
201 if (!he || he->h_addr_list[0] == NULL)
202 return EAI_NONAME;
203
204 switch (he->h_addrtype)
205 {
206#if HAVE_IPV6
207 case PF_INET6:
208 size = sizeof (struct v6_pair);
209 break;
210#endif
211
212#if HAVE_IPV4
213 case PF_INET:
214 size = sizeof (struct v4_pair);
215 break;
216#endif
217
218 default:
219 return EAI_NODATA;
220 }
221
222 storage = calloc (1, size);
223 if (!storage)
224 return EAI_MEMORY;
225
226 switch (he->h_addrtype)
227 {
228#if HAVE_IPV6
229 case PF_INET6:
230 {
231 struct v6_pair *p = storage;
232 struct sockaddr_in6 *sinp = &p->sockaddr_in6;
233 tmp = &p->addrinfo;
234
235 if (port)
236 sinp->sin6_port = port;
237
238 if (he->h_length != sizeof (sinp->sin6_addr))
239 {
240 free (storage);
241 return EAI_SYSTEM; /* FIXME: Better return code? Set errno? */
242 }
243
244 memcpy (&sinp->sin6_addr, he->h_addr_list[0], sizeof sinp->sin6_addr);
245
246 tmp->ai_addr = (struct sockaddr *) sinp;
247 tmp->ai_addrlen = sizeof *sinp;
248 }
249 break;
250#endif
251
252#if HAVE_IPV4
253 case PF_INET:
254 {
255 struct v4_pair *p = storage;
256 struct sockaddr_in *sinp = &p->sockaddr_in;
257 tmp = &p->addrinfo;
258
259 if (port)
260 sinp->sin_port = port;
261
262 if (he->h_length != sizeof (sinp->sin_addr))
263 {
264 free (storage);
265 return EAI_SYSTEM; /* FIXME: Better return code? Set errno? */
266 }
267
268 memcpy (&sinp->sin_addr, he->h_addr_list[0], sizeof sinp->sin_addr);
269
270 tmp->ai_addr = (struct sockaddr *) sinp;
271 tmp->ai_addrlen = sizeof *sinp;
272 }
273 break;
274#endif
275
276 default:
277 free (storage);
278 return EAI_NODATA;
279 }
280
281 if (hints && hints->ai_flags & AI_CANONNAME)
282 {
283 const char *cn;
284 if (he->h_name)
285 cn = he->h_name;
286 else
287 cn = nodename;
288
289 tmp->ai_canonname = strdup (cn);
290 if (!tmp->ai_canonname)
291 {
292 free (storage);
293 return EAI_MEMORY;
294 }
295 }
296
297 tmp->ai_protocol = (hints) ? hints->ai_protocol : 0;
298 tmp->ai_socktype = (hints) ? hints->ai_socktype : 0;
299 tmp->ai_addr->sa_family = he->h_addrtype;
300 tmp->ai_family = he->h_addrtype;
301
302 /* FIXME: If more than one address, create linked list of addrinfo's. */
303
304 *res = tmp;
305
306 return 0;
307}
308
309/* Free `addrinfo' structure AI including associated storage. */
310void
311freeaddrinfo (struct addrinfo *ai)
312{
313#ifdef WIN32_NATIVE
314 if (use_win32_p ())
315 {
316 freeaddrinfo_ptr (ai);
317 return;
318 }
319#endif
320
321 while (ai)
322 {
323 struct addrinfo *cur;
324
325 cur = ai;
326 ai = ai->ai_next;
327
328 if (cur->ai_canonname) free (cur->ai_canonname);
329 free (cur);
330 }
331}
332
333int getnameinfo(const struct sockaddr *restrict sa, socklen_t salen,
334 char *restrict node, socklen_t nodelen,
335 char *restrict service, socklen_t servicelen,
336 int flags)
337{
338#ifdef WIN32_NATIVE
339 if (use_win32_p ())
340 return getnameinfo_ptr (sa, salen, node, nodelen,
341 service, servicelen, flags);
342#endif
343
344 /* FIXME: Support other flags. */
345 if ((node && nodelen > 0 && !(flags & NI_NUMERICHOST)) ||
346 (service && servicelen > 0 && !(flags & NI_NUMERICHOST)) ||
347 (flags & ~(NI_NUMERICHOST|NI_NUMERICSERV)))
348 return EAI_BADFLAGS;
349
350 if (sa == NULL || salen < sizeof (sa->sa_family))
351 return EAI_FAMILY;
352
353 switch (sa->sa_family)
354 {
355#if HAVE_IPV4
356 case AF_INET:
357 if (salen < sizeof (struct sockaddr_in))
358 return EAI_FAMILY;
359 break;
360#endif
361#if HAVE_IPV6
362 case AF_INET6:
363 if (salen < sizeof (struct sockaddr_in6))
364 return EAI_FAMILY;
365 break;
366#endif
367 default:
368 return EAI_FAMILY;
369 }
370
371 if (node && nodelen > 0 && flags & NI_NUMERICHOST)
372 {
373 switch (sa->sa_family)
374 {
375#if HAVE_IPV4
376 case AF_INET:
377 if (!inet_ntop (AF_INET,
378 &(((const struct sockaddr_in *) sa)->sin_addr),
379 node, nodelen))
380 return EAI_SYSTEM;
381 break;
382#endif
383
384#if HAVE_IPV6
385 case AF_INET6:
386 if (!inet_ntop (AF_INET6,
387 &(((const struct sockaddr_in6 *) sa)->sin6_addr),
388 node, nodelen))
389 return EAI_SYSTEM;
390 break;
391#endif
392
393 default:
394 return EAI_FAMILY;
395 }
396 }
397
398 if (service && servicelen > 0 && flags & NI_NUMERICSERV)
399 switch (sa->sa_family)
400 {
401#if HAVE_IPV4
402 case AF_INET:
403#endif
404#if HAVE_IPV6
405 case AF_INET6:
406#endif
407 {
408 unsigned short int port
409 = ntohs (((const struct sockaddr_in *) sa)->sin_port);
410 if (servicelen <= snprintf (service, servicelen, "%u", port))
411 return EAI_OVERFLOW;
412 }
413 break;
414 }
415
416 return 0;
417}