2 * Copyright (C) 2004, 2005, 2007, 2008 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2003 Internet Software Consortium.
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.
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.
18 /* $Id: net.c,v 1.40 2008-07-04 05:52:31 each Exp $ */
22 #include <sys/types.h>
24 #if defined(HAVE_SYS_SYSCTL_H)
25 #if defined(HAVE_SYS_PARAM_H)
26 #include <sys/param.h>
28 #include <sys/sysctl.h>
38 #include <isc/strerror.h>
39 #include <isc/string.h>
43 * Definitions about UDP port range specification. This is a total mess of
44 * portability variants: some use sysctl (but the sysctl names vary), some use
45 * system-specific interfaces, some have the same interface for IPv4 and IPv6,
46 * some separate them, etc...
50 * The last resort defaults: use all non well known port space
52 #ifndef ISC_NET_PORTRANGELOW
53 #define ISC_NET_PORTRANGELOW 1024
54 #endif /* ISC_NET_PORTRANGELOW */
55 #ifndef ISC_NET_PORTRANGEHIGH
56 #define ISC_NET_PORTRANGEHIGH 65535
57 #endif /* ISC_NET_PORTRANGEHIGH */
59 #ifdef HAVE_SYSCTLBYNAME
64 #if defined(__FreeBSD__) || defined(__APPLE__) || defined(__DragonFly__)
65 #define USE_SYSCTL_PORTRANGE
66 #define SYSCTL_V4PORTRANGE_LOW "net.inet.ip.portrange.hifirst"
67 #define SYSCTL_V4PORTRANGE_HIGH "net.inet.ip.portrange.hilast"
68 #define SYSCTL_V6PORTRANGE_LOW "net.inet.ip.portrange.hifirst"
69 #define SYSCTL_V6PORTRANGE_HIGH "net.inet.ip.portrange.hilast"
73 #define USE_SYSCTL_PORTRANGE
74 #define SYSCTL_V4PORTRANGE_LOW "net.inet.ip.anonportmin"
75 #define SYSCTL_V4PORTRANGE_HIGH "net.inet.ip.anonportmax"
76 #define SYSCTL_V6PORTRANGE_LOW "net.inet6.ip6.anonportmin"
77 #define SYSCTL_V6PORTRANGE_HIGH "net.inet6.ip6.anonportmax"
80 #else /* !HAVE_SYSCTLBYNAME */
83 #define USE_SYSCTL_PORTRANGE
84 #define SYSCTL_V4PORTRANGE_LOW { CTL_NET, PF_INET, IPPROTO_IP, \
85 IPCTL_IPPORT_HIFIRSTAUTO }
86 #define SYSCTL_V4PORTRANGE_HIGH { CTL_NET, PF_INET, IPPROTO_IP, \
87 IPCTL_IPPORT_HILASTAUTO }
89 #define SYSCTL_V6PORTRANGE_LOW SYSCTL_V4PORTRANGE_LOW
90 #define SYSCTL_V6PORTRANGE_HIGH SYSCTL_V4PORTRANGE_HIGH
93 #endif /* HAVE_SYSCTLBYNAME */
95 #if defined(ISC_PLATFORM_HAVEIPV6)
96 # if defined(ISC_PLATFORM_NEEDIN6ADDRANY)
97 const struct in6_addr isc_net_in6addrany = IN6ADDR_ANY_INIT;
100 # if defined(ISC_PLATFORM_NEEDIN6ADDRLOOPBACK)
101 const struct in6_addr isc_net_in6addrloop = IN6ADDR_LOOPBACK_INIT;
104 # if defined(WANT_IPV6)
105 static isc_once_t once_ipv6only = ISC_ONCE_INIT;
108 # if defined(ISC_PLATFORM_HAVEIN6PKTINFO)
109 static isc_once_t once_ipv6pktinfo = ISC_ONCE_INIT;
111 #endif /* ISC_PLATFORM_HAVEIPV6 */
113 static isc_once_t once = ISC_ONCE_INIT;
115 static isc_result_t ipv4_result = ISC_R_NOTFOUND;
116 static isc_result_t ipv6_result = ISC_R_NOTFOUND;
117 static isc_result_t unix_result = ISC_R_NOTFOUND;
118 static isc_result_t ipv6only_result = ISC_R_NOTFOUND;
119 static isc_result_t ipv6pktinfo_result = ISC_R_NOTFOUND;
122 try_proto(int domain) {
124 isc_result_t result = ISC_R_SUCCESS;
125 char strbuf[ISC_STRERRORSIZE];
127 s = socket(domain, SOCK_STREAM, 0);
133 #ifdef EPROTONOSUPPORT
134 case EPROTONOSUPPORT:
139 return (ISC_R_NOTFOUND);
141 isc__strerror(errno, strbuf, sizeof(strbuf));
142 UNEXPECTED_ERROR(__FILE__, __LINE__,
144 isc_msgcat_get(isc_msgcat,
149 return (ISC_R_UNEXPECTED);
153 #ifdef ISC_PLATFORM_HAVEIPV6
155 #ifdef ISC_PLATFORM_HAVEIN6PKTINFO
156 if (domain == PF_INET6) {
157 struct sockaddr_in6 sin6;
161 * Check to see if IPv6 is broken, as is common on Linux.
164 if (getsockname(s, (struct sockaddr *)&sin6, (void *)&len) < 0)
166 isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
167 ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
168 "retrieving the address of an IPv6 "
169 "socket from the kernel failed.");
170 isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
171 ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
172 "IPv6 is not supported.");
173 result = ISC_R_NOTFOUND;
175 if (len == sizeof(struct sockaddr_in6))
176 result = ISC_R_SUCCESS;
178 isc_log_write(isc_lctx,
179 ISC_LOGCATEGORY_GENERAL,
180 ISC_LOGMODULE_SOCKET,
182 "IPv6 structures in kernel and "
183 "user space do not match.");
184 isc_log_write(isc_lctx,
185 ISC_LOGCATEGORY_GENERAL,
186 ISC_LOGMODULE_SOCKET,
188 "IPv6 is not supported.");
189 result = ISC_R_NOTFOUND;
203 initialize_action(void) {
204 ipv4_result = try_proto(PF_INET);
205 #ifdef ISC_PLATFORM_HAVEIPV6
207 #ifdef ISC_PLATFORM_HAVEIN6PKTINFO
208 ipv6_result = try_proto(PF_INET6);
212 #ifdef ISC_PLATFORM_HAVESYSUNH
213 unix_result = try_proto(PF_UNIX);
219 RUNTIME_CHECK(isc_once_do(&once, initialize_action) == ISC_R_SUCCESS);
223 isc_net_probeipv4(void) {
225 return (ipv4_result);
229 isc_net_probeipv6(void) {
231 return (ipv6_result);
235 isc_net_probeunix(void) {
237 return (unix_result);
240 #ifdef ISC_PLATFORM_HAVEIPV6
246 char strbuf[ISC_STRERRORSIZE];
250 result = isc_net_probeipv6();
251 if (result != ISC_R_SUCCESS) {
252 ipv6only_result = result;
257 ipv6only_result = ISC_R_NOTFOUND;
260 /* check for TCP sockets */
261 s = socket(PF_INET6, SOCK_STREAM, 0);
263 isc__strerror(errno, strbuf, sizeof(strbuf));
264 UNEXPECTED_ERROR(__FILE__, __LINE__,
266 isc_msgcat_get(isc_msgcat,
271 ipv6only_result = ISC_R_UNEXPECTED;
276 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
277 ipv6only_result = ISC_R_NOTFOUND;
283 /* check for UDP sockets */
284 s = socket(PF_INET6, SOCK_DGRAM, 0);
286 isc__strerror(errno, strbuf, sizeof(strbuf));
287 UNEXPECTED_ERROR(__FILE__, __LINE__,
289 isc_msgcat_get(isc_msgcat,
294 ipv6only_result = ISC_R_UNEXPECTED;
299 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
300 ipv6only_result = ISC_R_NOTFOUND;
306 ipv6only_result = ISC_R_SUCCESS;
311 #endif /* IPV6_V6ONLY */
315 initialize_ipv6only(void) {
316 RUNTIME_CHECK(isc_once_do(&once_ipv6only,
317 try_ipv6only) == ISC_R_SUCCESS);
319 #endif /* WANT_IPV6 */
321 #ifdef ISC_PLATFORM_HAVEIN6PKTINFO
323 try_ipv6pktinfo(void) {
325 char strbuf[ISC_STRERRORSIZE];
329 result = isc_net_probeipv6();
330 if (result != ISC_R_SUCCESS) {
331 ipv6pktinfo_result = result;
335 /* we only use this for UDP sockets */
336 s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
338 isc__strerror(errno, strbuf, sizeof(strbuf));
339 UNEXPECTED_ERROR(__FILE__, __LINE__,
341 isc_msgcat_get(isc_msgcat,
346 ipv6pktinfo_result = ISC_R_UNEXPECTED;
350 #ifdef IPV6_RECVPKTINFO
351 optname = IPV6_RECVPKTINFO;
353 optname = IPV6_PKTINFO;
356 if (setsockopt(s, IPPROTO_IPV6, optname, &on, sizeof(on)) < 0) {
357 ipv6pktinfo_result = ISC_R_NOTFOUND;
362 ipv6pktinfo_result = ISC_R_SUCCESS;
370 initialize_ipv6pktinfo(void) {
371 RUNTIME_CHECK(isc_once_do(&once_ipv6pktinfo,
372 try_ipv6pktinfo) == ISC_R_SUCCESS);
374 #endif /* ISC_PLATFORM_HAVEIN6PKTINFO */
375 #endif /* ISC_PLATFORM_HAVEIPV6 */
378 isc_net_probe_ipv6only(void) {
379 #ifdef ISC_PLATFORM_HAVEIPV6
381 initialize_ipv6only();
383 ipv6only_result = ISC_R_NOTFOUND;
386 return (ipv6only_result);
390 isc_net_probe_ipv6pktinfo(void) {
391 #ifdef ISC_PLATFORM_HAVEIPV6
392 #ifdef ISC_PLATFORM_HAVEIN6PKTINFO
394 initialize_ipv6pktinfo();
396 ipv6pktinfo_result = ISC_R_NOTFOUND;
400 return (ipv6pktinfo_result);
403 #if defined(USE_SYSCTL_PORTRANGE)
404 #if defined(HAVE_SYSCTLBYNAME)
406 getudpportrange_sysctl(int af, in_port_t *low, in_port_t *high) {
407 int port_low, port_high;
409 const char *sysctlname_lowport, *sysctlname_hiport;
412 sysctlname_lowport = SYSCTL_V4PORTRANGE_LOW;
413 sysctlname_hiport = SYSCTL_V4PORTRANGE_HIGH;
415 sysctlname_lowport = SYSCTL_V6PORTRANGE_LOW;
416 sysctlname_hiport = SYSCTL_V6PORTRANGE_HIGH;
418 portlen = sizeof(portlen);
419 if (sysctlbyname(sysctlname_lowport, &port_low, &portlen,
421 return (ISC_R_FAILURE);
423 portlen = sizeof(portlen);
424 if (sysctlbyname(sysctlname_hiport, &port_high, &portlen,
426 return (ISC_R_FAILURE);
428 if ((port_low & ~0xffff) != 0 || (port_high & ~0xffff) != 0)
429 return (ISC_R_RANGE);
431 *low = (in_port_t)port_low;
432 *high = (in_port_t)port_high;
434 return (ISC_R_SUCCESS);
436 #else /* !HAVE_SYSCTLBYNAME */
438 getudpportrange_sysctl(int af, in_port_t *low, in_port_t *high) {
439 int mib_lo4[4] = SYSCTL_V4PORTRANGE_LOW;
440 int mib_hi4[4] = SYSCTL_V4PORTRANGE_HIGH;
441 int mib_lo6[4] = SYSCTL_V6PORTRANGE_LOW;
442 int mib_hi6[4] = SYSCTL_V6PORTRANGE_HIGH;
443 int *mib_lo, *mib_hi, miblen;
444 int port_low, port_high;
450 miblen = sizeof(mib_lo4) / sizeof(mib_lo4[0]);
454 miblen = sizeof(mib_lo6) / sizeof(mib_lo6[0]);
457 portlen = sizeof(portlen);
458 if (sysctl(mib_lo, miblen, &port_low, &portlen, NULL, 0) < 0) {
459 return (ISC_R_FAILURE);
462 portlen = sizeof(portlen);
463 if (sysctl(mib_hi, miblen, &port_high, &portlen, NULL, 0) < 0) {
464 return (ISC_R_FAILURE);
467 if ((port_low & ~0xffff) != 0 || (port_high & ~0xffff) != 0)
468 return (ISC_R_RANGE);
470 *low = (in_port_t) port_low;
471 *high = (in_port_t) port_high;
473 return (ISC_R_SUCCESS);
475 #endif /* HAVE_SYSCTLBYNAME */
476 #endif /* USE_SYSCTL_PORTRANGE */
479 isc_net_getudpportrange(int af, in_port_t *low, in_port_t *high) {
480 int result = ISC_R_FAILURE;
482 REQUIRE(low != NULL && high != NULL);
484 #if defined(USE_SYSCTL_PORTRANGE)
485 result = getudpportrange_sysctl(af, low, high);
490 if (result != ISC_R_SUCCESS) {
491 *low = ISC_NET_PORTRANGELOW;
492 *high = ISC_NET_PORTRANGEHIGH;
495 return (ISC_R_SUCCESS); /* we currently never fail in this function */
499 isc_net_disableipv4(void) {
501 if (ipv4_result == ISC_R_SUCCESS)
502 ipv4_result = ISC_R_DISABLED;
506 isc_net_disableipv6(void) {
508 if (ipv6_result == ISC_R_SUCCESS)
509 ipv6_result = ISC_R_DISABLED;
513 isc_net_enableipv4(void) {
515 if (ipv4_result == ISC_R_DISABLED)
516 ipv4_result = ISC_R_SUCCESS;
520 isc_net_enableipv6(void) {
522 if (ipv6_result == ISC_R_DISABLED)
523 ipv6_result = ISC_R_SUCCESS;