net.c revision 293896 
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)
51const struct in6_addr isc_net_in6addrany = IN6ADDR_ANY_INIT;
52#endif
53
54#if defined(ISC_PLATFORM_NEEDIN6ADDRLOOPBACK)
55const struct in6_addr isc_net_in6addrloop = IN6ADDR_LOOPBACK_INIT;
56#endif
57
58
59static isc_once_t 	once = ISC_ONCE_INIT;
60static isc_once_t 	once_ipv6only = ISC_ONCE_INIT;
61static isc_once_t 	once_ipv6pktinfo = ISC_ONCE_INIT;
62static isc_result_t	ipv4_result = ISC_R_NOTFOUND;
63static isc_result_t	ipv6_result = ISC_R_NOTFOUND;
64static isc_result_t	ipv6only_result = ISC_R_NOTFOUND;
65static isc_result_t	ipv6pktinfo_result = ISC_R_NOTFOUND;
66
67void InitSockets(void);
68
69static isc_result_t
70try_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
101static void
102initialize_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
114static void
115initialize(void) {
116	RUNTIME_CHECK(isc_once_do(&once, initialize_action) == ISC_R_SUCCESS);
117}
118
119isc_result_t
120isc_net_probeipv4(void) {
121	initialize();
122	return (ipv4_result);
123}
124
125isc_result_t
126isc_net_probeipv6(void) {
127	initialize();
128	return (ipv6_result);
129}
130
131isc_result_t
132isc_net_probeunix(void) {
133	return (ISC_R_NOTFOUND);
134}
135
136#ifdef ISC_PLATFORM_HAVEIPV6
137#ifdef WANT_IPV6
138static void
139try_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
205close:
206	closesocket(s);
207	return;
208#endif /* IPV6_V6ONLY */
209}
210
211static void
212initialize_ipv6only(void) {
213	RUNTIME_CHECK(isc_once_do(&once_ipv6only,
214				  try_ipv6only) == ISC_R_SUCCESS);
215}
216
217static void
218try_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
260close:
261	closesocket(s);
262	return;
263}
264
265static void
266initialize_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
273isc_result_t
274isc_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
285isc_result_t
286isc_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
297isc_result_t
298isc_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
313void
314isc_net_disableipv4(void) {
315	initialize();
316	if (ipv4_result == ISC_R_SUCCESS)
317		ipv4_result = ISC_R_DISABLED;
318}
319
320void
321isc_net_disableipv6(void) {
322	initialize();
323	if (ipv6_result == ISC_R_SUCCESS)
324		ipv6_result = ISC_R_DISABLED;
325}
326
327void
328isc_net_enableipv4(void) {
329	initialize();
330	if (ipv4_result == ISC_R_DISABLED)
331		ipv4_result = ISC_R_SUCCESS;
332}
333
334void
335isc_net_enableipv6(void) {
336	initialize();
337	if (ipv6_result == ISC_R_DISABLED)
338		ipv6_result = ISC_R_SUCCESS;
339}
340