1 /*
2 * Copyright (C) 2004, 2005, 2007-2009, 2011, 2012 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2003 Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and/or 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 /* $Id$ */
19
20 #include <config.h>
21
22 #include <errno.h>
23 #include <unistd.h>
24
25 #include <isc/log.h>
26 #include <isc/msgs.h>
27 #include <isc/net.h>
28 #include <isc/once.h>
29 #include <isc/strerror.h>
30 #include <isc/string.h>
31 #include <isc/util.h>
32
33 /*%
34 * Definitions about UDP port range specification. This is a total mess of
35 * portability variants: some use sysctl (but the sysctl names vary), some use
36 * system-specific interfaces, some have the same interface for IPv4 and IPv6,
37 * some separate them, etc...
38 */
39
40 /*%
41 * The last resort defaults: use all non well known port space
42 */
43 #ifndef ISC_NET_PORTRANGELOW
44 #define ISC_NET_PORTRANGELOW 1024
45 #endif /* ISC_NET_PORTRANGELOW */
46 #ifndef ISC_NET_PORTRANGEHIGH
47 #define ISC_NET_PORTRANGEHIGH 65535
48 #endif /* ISC_NET_PORTRANGEHIGH */
49
50 #if defined(ISC_PLATFORM_NEEDIN6ADDRANY)
51 const struct in6_addr isc_net_in6addrany = IN6ADDR_ANY_INIT;
52 #endif
53
54 #if defined(ISC_PLATFORM_NEEDIN6ADDRLOOPBACK)
55 const struct in6_addr isc_net_in6addrloop = IN6ADDR_LOOPBACK_INIT;
56 #endif
57
58
59 static isc_once_t once = ISC_ONCE_INIT;
60 static isc_once_t once_ipv6only = ISC_ONCE_INIT;
61 static isc_once_t once_ipv6pktinfo = ISC_ONCE_INIT;
62 static isc_result_t ipv4_result = ISC_R_NOTFOUND;
63 static isc_result_t ipv6_result = ISC_R_NOTFOUND;
64 static isc_result_t ipv6only_result = ISC_R_NOTFOUND;
65 static isc_result_t ipv6pktinfo_result = ISC_R_NOTFOUND;
66
67 void InitSockets(void);
68
69 static isc_result_t
try_proto(int domain)70 try_proto(int domain) {
71 SOCKET s;
72 char strbuf[ISC_STRERRORSIZE];
73 int errval;
74
75 s = socket(domain, SOCK_STREAM, IPPROTO_TCP);
76 if (s == INVALID_SOCKET) {
77 errval = WSAGetLastError();
78 switch (errval) {
79 case WSAEAFNOSUPPORT:
80 case WSAEPROTONOSUPPORT:
81 case WSAEINVAL:
82 return (ISC_R_NOTFOUND);
83 default:
84 isc__strerror(errval, strbuf, sizeof(strbuf));
85 UNEXPECTED_ERROR(__FILE__, __LINE__,
86 "socket() %s: %s",
87 isc_msgcat_get(isc_msgcat,
88 ISC_MSGSET_GENERAL,
89 ISC_MSG_FAILED,
90 "failed"),
91 strbuf);
92 return (ISC_R_UNEXPECTED);
93 }
94 }
95
96 closesocket(s);
97
98 return (ISC_R_SUCCESS);
99 }
100
101 static void
initialize_action(void)102 initialize_action(void) {
103 InitSockets();
104 ipv4_result = try_proto(PF_INET);
105 #ifdef ISC_PLATFORM_HAVEIPV6
106 #ifdef WANT_IPV6
107 #ifdef ISC_PLATFORM_HAVEIN6PKTINFO
108 ipv6_result = try_proto(PF_INET6);
109 #endif
110 #endif
111 #endif
112 }
113
114 static void
initialize(void)115 initialize(void) {
116 RUNTIME_CHECK(isc_once_do(&once, initialize_action) == ISC_R_SUCCESS);
117 }
118
119 isc_result_t
isc_net_probeipv4(void)120 isc_net_probeipv4(void) {
121 initialize();
122 return (ipv4_result);
123 }
124
125 isc_result_t
isc_net_probeipv6(void)126 isc_net_probeipv6(void) {
127 initialize();
128 return (ipv6_result);
129 }
130
131 isc_result_t
isc_net_probeunix(void)132 isc_net_probeunix(void) {
133 return (ISC_R_NOTFOUND);
134 }
135
136 #ifdef ISC_PLATFORM_HAVEIPV6
137 #ifdef WANT_IPV6
138 static void
try_ipv6only(void)139 try_ipv6only(void) {
140 #ifdef IPV6_V6ONLY
141 SOCKET s;
142 int on;
143 char strbuf[ISC_STRERRORSIZE];
144 #endif
145 isc_result_t result;
146
147 result = isc_net_probeipv6();
148 if (result != ISC_R_SUCCESS) {
149 ipv6only_result = result;
150 return;
151 }
152
153 #ifndef IPV6_V6ONLY
154 ipv6only_result = ISC_R_NOTFOUND;
155 return;
156 #else
157 /* check for TCP sockets */
158 s = socket(PF_INET6, SOCK_STREAM, 0);
159 if (s == INVALID_SOCKET) {
160 isc__strerror(errno, strbuf, sizeof(strbuf));
161 UNEXPECTED_ERROR(__FILE__, __LINE__,
162 "socket() %s: %s",
163 isc_msgcat_get(isc_msgcat,
164 ISC_MSGSET_GENERAL,
165 ISC_MSG_FAILED,
166 "failed"),
167 strbuf);
168 ipv6only_result = ISC_R_UNEXPECTED;
169 return;
170 }
171
172 on = 1;
173 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, (const char *)&on,
174 sizeof(on)) < 0) {
175 ipv6only_result = ISC_R_NOTFOUND;
176 goto close;
177 }
178
179 closesocket(s);
180
181 /* check for UDP sockets */
182 s = socket(PF_INET6, SOCK_DGRAM, 0);
183 if (s == INVALID_SOCKET) {
184 isc__strerror(errno, strbuf, sizeof(strbuf));
185 UNEXPECTED_ERROR(__FILE__, __LINE__,
186 "socket() %s: %s",
187 isc_msgcat_get(isc_msgcat,
188 ISC_MSGSET_GENERAL,
189 ISC_MSG_FAILED,
190 "failed"),
191 strbuf);
192 ipv6only_result = ISC_R_UNEXPECTED;
193 return;
194 }
195
196 on = 1;
197 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, (const char *)&on,
198 sizeof(on)) < 0) {
199 ipv6only_result = ISC_R_NOTFOUND;
200 goto close;
201 }
202
203 ipv6only_result = ISC_R_SUCCESS;
204
205 close:
206 closesocket(s);
207 return;
208 #endif /* IPV6_V6ONLY */
209 }
210
211 static void
initialize_ipv6only(void)212 initialize_ipv6only(void) {
213 RUNTIME_CHECK(isc_once_do(&once_ipv6only,
214 try_ipv6only) == ISC_R_SUCCESS);
215 }
216
217 static void
try_ipv6pktinfo(void)218 try_ipv6pktinfo(void) {
219 SOCKET s;
220 int on;
221 char strbuf[ISC_STRERRORSIZE];
222 isc_result_t result;
223 int optname;
224
225 result = isc_net_probeipv6();
226 if (result != ISC_R_SUCCESS) {
227 ipv6pktinfo_result = result;
228 return;
229 }
230
231 /* we only use this for UDP sockets */
232 s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
233 if (s == INVALID_SOCKET) {
234 isc__strerror(errno, strbuf, sizeof(strbuf));
235 UNEXPECTED_ERROR(__FILE__, __LINE__,
236 "socket() %s: %s",
237 isc_msgcat_get(isc_msgcat,
238 ISC_MSGSET_GENERAL,
239 ISC_MSG_FAILED,
240 "failed"),
241 strbuf);
242 ipv6pktinfo_result = ISC_R_UNEXPECTED;
243 return;
244 }
245
246 #ifdef IPV6_RECVPKTINFO
247 optname = IPV6_RECVPKTINFO;
248 #else
249 optname = IPV6_PKTINFO;
250 #endif
251 on = 1;
252 if (setsockopt(s, IPPROTO_IPV6, optname, (const char *) &on,
253 sizeof(on)) < 0) {
254 ipv6pktinfo_result = ISC_R_NOTFOUND;
255 goto close;
256 }
257
258 ipv6pktinfo_result = ISC_R_SUCCESS;
259
260 close:
261 closesocket(s);
262 return;
263 }
264
265 static void
initialize_ipv6pktinfo(void)266 initialize_ipv6pktinfo(void) {
267 RUNTIME_CHECK(isc_once_do(&once_ipv6pktinfo,
268 try_ipv6pktinfo) == ISC_R_SUCCESS);
269 }
270 #endif /* WANT_IPV6 */
271 #endif /* ISC_PLATFORM_HAVEIPV6 */
272
273 isc_result_t
isc_net_probe_ipv6only(void)274 isc_net_probe_ipv6only(void) {
275 #ifdef ISC_PLATFORM_HAVEIPV6
276 #ifdef WANT_IPV6
277 initialize_ipv6only();
278 #else
279 ipv6only_result = ISC_R_NOTFOUND;
280 #endif
281 #endif
282 return (ipv6only_result);
283 }
284
285 isc_result_t
isc_net_probe_ipv6pktinfo(void)286 isc_net_probe_ipv6pktinfo(void) {
287 #ifdef ISC_PLATFORM_HAVEIPV6
288 #ifdef WANT_IPV6
289 initialize_ipv6pktinfo();
290 #else
291 ipv6pktinfo_result = ISC_R_NOTFOUND;
292 #endif
293 #endif
294 return (ipv6pktinfo_result);
295 }
296
297 isc_result_t
isc_net_getudpportrange(int af,in_port_t * low,in_port_t * high)298 isc_net_getudpportrange(int af, in_port_t *low, in_port_t *high) {
299 int result = ISC_R_FAILURE;
300
301 REQUIRE(low != NULL && high != NULL);
302
303 UNUSED(af);
304
305 if (result != ISC_R_SUCCESS) {
306 *low = ISC_NET_PORTRANGELOW;
307 *high = ISC_NET_PORTRANGEHIGH;
308 }
309
310 return (ISC_R_SUCCESS); /* we currently never fail in this function */
311 }
312
313 void
isc_net_disableipv4(void)314 isc_net_disableipv4(void) {
315 initialize();
316 if (ipv4_result == ISC_R_SUCCESS)
317 ipv4_result = ISC_R_DISABLED;
318 }
319
320 void
isc_net_disableipv6(void)321 isc_net_disableipv6(void) {
322 initialize();
323 if (ipv6_result == ISC_R_SUCCESS)
324 ipv6_result = ISC_R_DISABLED;
325 }
326
327 void
isc_net_enableipv4(void)328 isc_net_enableipv4(void) {
329 initialize();
330 if (ipv4_result == ISC_R_DISABLED)
331 ipv4_result = ISC_R_SUCCESS;
332 }
333
334 void
isc_net_enableipv6(void)335 isc_net_enableipv6(void) {
336 initialize();
337 if (ipv6_result == ISC_R_DISABLED)
338 ipv6_result = ISC_R_SUCCESS;
339 }
340