net.c revision 258945 
1/*
2 * Copyright (C) 2004, 2005, 2007, 2008  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: net.c,v 1.18 2008/08/08 05:06:49 marka Exp $ */
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, (char *)&on, sizeof(on)) < 0) {
174		ipv6only_result = ISC_R_NOTFOUND;
175		goto close;
176	}
177
178	closesocket(s);
179
180	/* check for UDP sockets */
181	s = socket(PF_INET6, SOCK_DGRAM, 0);
182	if (s == INVALID_SOCKET) {
183		isc__strerror(errno, strbuf, sizeof(strbuf));
184		UNEXPECTED_ERROR(__FILE__, __LINE__,
185				 "socket() %s: %s",
186				 isc_msgcat_get(isc_msgcat,
187						ISC_MSGSET_GENERAL,
188						ISC_MSG_FAILED,
189						"failed"),
190				 strbuf);
191		ipv6only_result = ISC_R_UNEXPECTED;
192		return;
193	}
194
195	on = 1;
196	if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&on, sizeof(on)) < 0) {
197		ipv6only_result = ISC_R_NOTFOUND;
198		goto close;
199	}
200
201	ipv6only_result = ISC_R_SUCCESS;
202
203close:
204	closesocket(s);
205	return;
206#endif /* IPV6_V6ONLY */
207}
208
209static void
210initialize_ipv6only(void) {
211	RUNTIME_CHECK(isc_once_do(&once_ipv6only,
212				  try_ipv6only) == ISC_R_SUCCESS);
213}
214
215static void
216try_ipv6pktinfo(void) {
217	int s, on;
218	char strbuf[ISC_STRERRORSIZE];
219	isc_result_t result;
220	int optname;
221
222	result = isc_net_probeipv6();
223	if (result != ISC_R_SUCCESS) {
224		ipv6pktinfo_result = result;
225		return;
226	}
227
228	/* we only use this for UDP sockets */
229	s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
230	if (s == INVALID_SOCKET) {
231		isc__strerror(errno, strbuf, sizeof(strbuf));
232		UNEXPECTED_ERROR(__FILE__, __LINE__,
233				 "socket() %s: %s",
234				 isc_msgcat_get(isc_msgcat,
235						ISC_MSGSET_GENERAL,
236						ISC_MSG_FAILED,
237						"failed"),
238				 strbuf);
239		ipv6pktinfo_result = ISC_R_UNEXPECTED;
240		return;
241	}
242
243#ifdef IPV6_RECVPKTINFO
244	optname = IPV6_RECVPKTINFO;
245#else
246	optname = IPV6_PKTINFO;
247#endif
248	on = 1;
249	if (setsockopt(s, IPPROTO_IPV6, optname, (const char *) &on,
250		       sizeof(on)) < 0) {
251		ipv6pktinfo_result = ISC_R_NOTFOUND;
252		goto close;
253	}
254
255	ipv6pktinfo_result = ISC_R_SUCCESS;
256
257close:
258	closesocket(s);
259	return;
260}
261
262static void
263initialize_ipv6pktinfo(void) {
264	RUNTIME_CHECK(isc_once_do(&once_ipv6pktinfo,
265				  try_ipv6pktinfo) == ISC_R_SUCCESS);
266}
267#endif /* WANT_IPV6 */
268#endif /* ISC_PLATFORM_HAVEIPV6 */
269
270isc_result_t
271isc_net_probe_ipv6only(void) {
272#ifdef ISC_PLATFORM_HAVEIPV6
273#ifdef WANT_IPV6
274	initialize_ipv6only();
275#else
276	ipv6only_result = ISC_R_NOTFOUND;
277#endif
278#endif
279	return (ipv6only_result);
280}
281
282isc_result_t
283isc_net_probe_ipv6pktinfo(void) {
284#ifdef ISC_PLATFORM_HAVEIPV6
285#ifdef WANT_IPV6
286	initialize_ipv6pktinfo();
287#else
288	ipv6pktinfo_result = ISC_R_NOTFOUND;
289#endif
290#endif
291	return (ipv6pktinfo_result);
292}
293
294isc_result_t
295isc_net_getudpportrange(int af, in_port_t *low, in_port_t *high) {
296	int result = ISC_R_FAILURE;
297
298	REQUIRE(low != NULL && high != NULL);
299
300	UNUSED(af);
301
302	if (result != ISC_R_SUCCESS) {
303		*low = ISC_NET_PORTRANGELOW;
304		*high = ISC_NET_PORTRANGEHIGH;
305	}
306
307	return (ISC_R_SUCCESS);	/* we currently never fail in this function */
308}
309
310void
311isc_net_disableipv4(void) {
312	initialize();
313	if (ipv4_result == ISC_R_SUCCESS)
314		ipv4_result = ISC_R_DISABLED;
315}
316
317void
318isc_net_disableipv6(void) {
319	initialize();
320	if (ipv6_result == ISC_R_SUCCESS)
321		ipv6_result = ISC_R_DISABLED;
322}
323
324void
325isc_net_enableipv4(void) {
326	initialize();
327	if (ipv4_result == ISC_R_DISABLED)
328		ipv4_result = ISC_R_SUCCESS;
329}
330
331void
332isc_net_enableipv6(void) {
333	initialize();
334	if (ipv6_result == ISC_R_DISABLED)
335		ipv6_result = ISC_R_SUCCESS;
336}
337