1 /*
2 * Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2003 Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 /* $Id: net.c,v 1.22.2.2.10.7 2004/04/29 01:31:22 marka Exp $ */
19
20 #include <config.h>
21
22 #include <errno.h>
23 #include <unistd.h>
24
25 #include <isc/net.h>
26 #include <isc/once.h>
27 #include <isc/strerror.h>
28 #include <isc/string.h>
29 #include <isc/util.h>
30
31 #if defined(ISC_PLATFORM_HAVEIPV6) && defined(ISC_PLATFORM_NEEDIN6ADDRANY)
32 const struct in6_addr isc_net_in6addrany = IN6ADDR_ANY_INIT;
33 #endif
34
35 #if defined(ISC_PLATFORM_HAVEIPV6) && defined(ISC_PLATFORM_NEEDIN6ADDRLOOPBACK)
36 const struct in6_addr isc_net_in6addrloop = IN6ADDR_LOOPBACK_INIT;
37 #endif
38
39 static isc_boolean_t once = ISC_FALSE;
40 static isc_once_t once_ipv6only = ISC_ONCE_INIT;
41 static isc_once_t once_ipv6pktinfo = ISC_ONCE_INIT;
42 static isc_result_t ipv4_result = ISC_R_NOTFOUND;
43 static isc_result_t ipv6_result = ISC_R_NOTFOUND;
44 static isc_result_t ipv6only_result = ISC_R_NOTFOUND;
45 static isc_result_t ipv6pktinfo_result = ISC_R_NOTFOUND;
46
47 static isc_result_t
try_proto(int domain)48 try_proto(int domain) {
49 int s;
50 isc_result_t result = ISC_R_SUCCESS;
51 char strbuf[ISC_STRERRORSIZE];
52
53 s = socket(domain, SOCK_STREAM, 0);
54 if (s == -1) {
55 switch (errno) {
56 #ifdef EAFNOSUPPORT
57 case EAFNOSUPPORT:
58 #endif
59 #ifdef EPROTONOSUPPORT
60 case EPROTONOSUPPORT:
61 #endif
62 #ifdef EINVAL
63 case EINVAL:
64 #endif
65 return (ISC_R_NOTFOUND);
66 default:
67 isc__strerror(errno, strbuf, sizeof(strbuf));
68 UNEXPECTED_ERROR(__FILE__, __LINE__,
69 "socket() failed: %s",
70 strbuf);
71 return (ISC_R_UNEXPECTED);
72 }
73 }
74
75 #ifdef ISC_PLATFORM_HAVEIPV6
76 #ifdef WANT_IPV6
77 #ifdef ISC_PLATFORM_HAVEIN6PKTINFO
78 if (domain == PF_INET6) {
79 struct sockaddr_in6 sin6;
80 GETSOCKNAME_SOCKLEN_TYPE len;
81
82 /*
83 * Check to see if IPv6 is broken, as is common on Linux.
84 */
85 len = sizeof(sin6);
86 if (getsockname(s, (struct sockaddr *)&sin6, &len) < 0)
87 {
88 result = ISC_R_NOTFOUND;
89 } else {
90 if (len == sizeof(struct sockaddr_in6))
91 result = ISC_R_SUCCESS;
92 else {
93 result = ISC_R_NOTFOUND;
94 }
95 }
96 }
97 #endif
98 #endif
99 #endif
100
101 (void)close(s);
102
103 return (result);
104 }
105
106 static void
initialize_action(void)107 initialize_action(void) {
108 ipv4_result = try_proto(PF_INET);
109 #ifdef ISC_PLATFORM_HAVEIPV6
110 #ifdef WANT_IPV6
111 #ifdef ISC_PLATFORM_HAVEIN6PKTINFO
112 ipv6_result = try_proto(PF_INET6);
113 #endif
114 #endif
115 #endif
116 }
117
118 static void
initialize(void)119 initialize(void) {
120 if(once == ISC_FALSE) {
121 initialize_action();
122 once = ISC_TRUE;
123 }
124 }
125
126 isc_result_t
isc_net_probeipv4(void)127 isc_net_probeipv4(void) {
128 initialize();
129 return (ipv4_result);
130 }
131
132 isc_result_t
isc_net_probeipv6(void)133 isc_net_probeipv6(void) {
134 initialize();
135 return (ipv6_result);
136 }
137
138 #ifdef ISC_PLATFORM_HAVEIPV6
139 #ifdef WANT_IPV6
140 static void
try_ipv6only(void)141 try_ipv6only(void) {
142 #ifdef IPV6_V6ONLY
143 int s, on;
144 char strbuf[ISC_STRERRORSIZE];
145 #endif
146 isc_result_t result;
147
148 result = isc_net_probeipv6();
149 if (result != ISC_R_SUCCESS) {
150 ipv6only_result = result;
151 return;
152 }
153
154 #ifndef IPV6_V6ONLY
155 ipv6only_result = ISC_R_NOTFOUND;
156 return;
157 #else
158 /* check for TCP sockets */
159 s = socket(PF_INET6, SOCK_STREAM, 0);
160 if (s == -1) {
161 isc__strerror(errno, strbuf, sizeof(strbuf));
162 UNEXPECTED_ERROR(__FILE__, __LINE__,
163 "socket() failed: %s",
164 strbuf);
165 ipv6only_result = ISC_R_UNEXPECTED;
166 return;
167 }
168
169 on = 1;
170 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
171 ipv6only_result = ISC_R_NOTFOUND;
172 goto close;
173 }
174
175 close(s);
176
177 /* check for UDP sockets */
178 s = socket(PF_INET6, SOCK_DGRAM, 0);
179 if (s == -1) {
180 isc__strerror(errno, strbuf, sizeof(strbuf));
181 UNEXPECTED_ERROR(__FILE__, __LINE__,
182 "socket() failed: %s",
183 strbuf);
184 ipv6only_result = ISC_R_UNEXPECTED;
185 return;
186 }
187
188 on = 1;
189 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
190 ipv6only_result = ISC_R_NOTFOUND;
191 goto close;
192 }
193
194 close(s);
195
196 ipv6only_result = ISC_R_SUCCESS;
197
198 close:
199 close(s);
200 return;
201 #endif /* IPV6_V6ONLY */
202 }
203
204 static void
initialize_ipv6only(void)205 initialize_ipv6only(void) {
206 RUNTIME_CHECK(isc_once_do(&once_ipv6only,
207 try_ipv6only) == ISC_R_SUCCESS);
208 }
209
210 static void
try_ipv6pktinfo(void)211 try_ipv6pktinfo(void) {
212 int s, on;
213 char strbuf[ISC_STRERRORSIZE];
214 isc_result_t result;
215 int optname;
216
217 result = isc_net_probeipv6();
218 if (result != ISC_R_SUCCESS) {
219 ipv6pktinfo_result = result;
220 return;
221 }
222
223 /* we only use this for UDP sockets */
224 s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
225 if (s == -1) {
226 isc__strerror(errno, strbuf, sizeof(strbuf));
227 UNEXPECTED_ERROR(__FILE__, __LINE__,
228 "socket() failed: %s",
229 strbuf);
230 ipv6pktinfo_result = ISC_R_UNEXPECTED;
231 return;
232 }
233
234 #ifdef IPV6_RECVPKTINFO
235 optname = IPV6_RECVPKTINFO;
236 #else
237 optname = IPV6_PKTINFO;
238 #endif
239 on = 1;
240 if (setsockopt(s, IPPROTO_IPV6, optname, &on, sizeof(on)) < 0) {
241 ipv6pktinfo_result = ISC_R_NOTFOUND;
242 goto close;
243 }
244
245 close(s);
246 ipv6pktinfo_result = ISC_R_SUCCESS;
247
248 close:
249 close(s);
250 return;
251 }
252
253 static void
initialize_ipv6pktinfo(void)254 initialize_ipv6pktinfo(void) {
255 RUNTIME_CHECK(isc_once_do(&once_ipv6pktinfo,
256 try_ipv6pktinfo) == ISC_R_SUCCESS);
257 }
258 #endif /* WANT_IPV6 */
259 #endif /* ISC_PLATFORM_HAVEIPV6 */
260
261 isc_result_t
isc_net_probe_ipv6only(void)262 isc_net_probe_ipv6only(void) {
263 #ifdef ISC_PLATFORM_HAVEIPV6
264 #ifdef WANT_IPV6
265 initialize_ipv6only();
266 #else
267 ipv6only_result = ISC_R_NOTFOUND;
268 #endif
269 #endif
270 return (ipv6only_result);
271 }
272
273 isc_result_t
isc_net_probe_ipv6pktinfo(void)274 isc_net_probe_ipv6pktinfo(void) {
275 #ifdef ISC_PLATFORM_HAVEIPV6
276 #ifdef WANT_IPV6
277 initialize_ipv6pktinfo();
278 #else
279 ipv6pktinfo_result = ISC_R_NOTFOUND;
280 #endif
281 #endif
282 return (ipv6pktinfo_result);
283 }
284
285 void
isc_net_disableipv4(void)286 isc_net_disableipv4(void) {
287 initialize();
288 if (ipv4_result == ISC_R_SUCCESS)
289 ipv4_result = ISC_R_DISABLED;
290 }
291
292 void
isc_net_disableipv6(void)293 isc_net_disableipv6(void) {
294 initialize();
295 if (ipv6_result == ISC_R_SUCCESS)
296 ipv6_result = ISC_R_DISABLED;
297 }
298
299 void
isc_net_enableipv4(void)300 isc_net_enableipv4(void) {
301 initialize();
302 if (ipv4_result == ISC_R_DISABLED)
303 ipv4_result = ISC_R_SUCCESS;
304 }
305
306 void
isc_net_enableipv6(void)307 isc_net_enableipv6(void) {
308 initialize();
309 if (ipv6_result == ISC_R_DISABLED)
310 ipv6_result = ISC_R_SUCCESS;
311 }
312