312 lines
6.4 KiB
C
312 lines
6.4 KiB
C
/*
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* Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 1999-2003 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: net.c,v 1.22.2.2.10.7 2004/04/29 01:31:22 marka Exp $ */
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#include <config.h>
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#include <errno.h>
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#include <unistd.h>
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#include <isc/net.h>
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#include <isc/once.h>
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#include <isc/strerror.h>
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#include <isc/string.h>
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#include <isc/util.h>
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#if defined(ISC_PLATFORM_HAVEIPV6) && defined(ISC_PLATFORM_NEEDIN6ADDRANY)
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const struct in6_addr isc_net_in6addrany = IN6ADDR_ANY_INIT;
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#endif
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#if defined(ISC_PLATFORM_HAVEIPV6) && defined(ISC_PLATFORM_NEEDIN6ADDRLOOPBACK)
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const struct in6_addr isc_net_in6addrloop = IN6ADDR_LOOPBACK_INIT;
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#endif
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static isc_boolean_t once = ISC_FALSE;
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static isc_once_t once_ipv6only = ISC_ONCE_INIT;
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static isc_once_t once_ipv6pktinfo = ISC_ONCE_INIT;
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static isc_result_t ipv4_result = ISC_R_NOTFOUND;
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static isc_result_t ipv6_result = ISC_R_NOTFOUND;
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static isc_result_t ipv6only_result = ISC_R_NOTFOUND;
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static isc_result_t ipv6pktinfo_result = ISC_R_NOTFOUND;
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static isc_result_t
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try_proto(int domain) {
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int s;
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isc_result_t result = ISC_R_SUCCESS;
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char strbuf[ISC_STRERRORSIZE];
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s = socket(domain, SOCK_STREAM, 0);
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if (s == -1) {
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switch (errno) {
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#ifdef EAFNOSUPPORT
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case EAFNOSUPPORT:
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#endif
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#ifdef EPROTONOSUPPORT
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case EPROTONOSUPPORT:
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#endif
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#ifdef EINVAL
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case EINVAL:
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#endif
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return (ISC_R_NOTFOUND);
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default:
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isc__strerror(errno, strbuf, sizeof(strbuf));
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"socket() failed: %s",
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strbuf);
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return (ISC_R_UNEXPECTED);
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}
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}
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#ifdef ISC_PLATFORM_HAVEIPV6
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#ifdef WANT_IPV6
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#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
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if (domain == PF_INET6) {
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struct sockaddr_in6 sin6;
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GETSOCKNAME_SOCKLEN_TYPE len;
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/*
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* Check to see if IPv6 is broken, as is common on Linux.
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*/
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len = sizeof(sin6);
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if (getsockname(s, (struct sockaddr *)&sin6, &len) < 0)
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{
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result = ISC_R_NOTFOUND;
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} else {
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if (len == sizeof(struct sockaddr_in6))
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result = ISC_R_SUCCESS;
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else {
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result = ISC_R_NOTFOUND;
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}
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}
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}
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#endif
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#endif
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#endif
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(void)close(s);
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return (result);
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}
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static void
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initialize_action(void) {
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ipv4_result = try_proto(PF_INET);
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#ifdef ISC_PLATFORM_HAVEIPV6
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#ifdef WANT_IPV6
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#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
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ipv6_result = try_proto(PF_INET6);
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#endif
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#endif
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#endif
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}
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static void
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initialize(void) {
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if(once == ISC_FALSE) {
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initialize_action();
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once = ISC_TRUE;
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}
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}
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isc_result_t
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isc_net_probeipv4(void) {
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initialize();
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return (ipv4_result);
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}
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isc_result_t
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isc_net_probeipv6(void) {
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initialize();
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return (ipv6_result);
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}
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#ifdef ISC_PLATFORM_HAVEIPV6
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#ifdef WANT_IPV6
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static void
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try_ipv6only(void) {
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#ifdef IPV6_V6ONLY
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int s, on;
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char strbuf[ISC_STRERRORSIZE];
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#endif
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isc_result_t result;
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result = isc_net_probeipv6();
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if (result != ISC_R_SUCCESS) {
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ipv6only_result = result;
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return;
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}
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#ifndef IPV6_V6ONLY
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ipv6only_result = ISC_R_NOTFOUND;
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return;
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#else
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/* check for TCP sockets */
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s = socket(PF_INET6, SOCK_STREAM, 0);
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if (s == -1) {
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isc__strerror(errno, strbuf, sizeof(strbuf));
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"socket() failed: %s",
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strbuf);
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ipv6only_result = ISC_R_UNEXPECTED;
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return;
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}
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on = 1;
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if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
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ipv6only_result = ISC_R_NOTFOUND;
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goto close;
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}
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close(s);
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/* check for UDP sockets */
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s = socket(PF_INET6, SOCK_DGRAM, 0);
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if (s == -1) {
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isc__strerror(errno, strbuf, sizeof(strbuf));
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"socket() failed: %s",
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strbuf);
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ipv6only_result = ISC_R_UNEXPECTED;
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return;
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}
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on = 1;
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if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
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ipv6only_result = ISC_R_NOTFOUND;
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goto close;
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}
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close(s);
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ipv6only_result = ISC_R_SUCCESS;
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close:
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close(s);
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return;
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#endif /* IPV6_V6ONLY */
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}
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static void
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initialize_ipv6only(void) {
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RUNTIME_CHECK(isc_once_do(&once_ipv6only,
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try_ipv6only) == ISC_R_SUCCESS);
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}
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static void
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try_ipv6pktinfo(void) {
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int s, on;
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char strbuf[ISC_STRERRORSIZE];
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isc_result_t result;
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int optname;
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result = isc_net_probeipv6();
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if (result != ISC_R_SUCCESS) {
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ipv6pktinfo_result = result;
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return;
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}
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/* we only use this for UDP sockets */
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s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
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if (s == -1) {
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isc__strerror(errno, strbuf, sizeof(strbuf));
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"socket() failed: %s",
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strbuf);
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ipv6pktinfo_result = ISC_R_UNEXPECTED;
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return;
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}
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#ifdef IPV6_RECVPKTINFO
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optname = IPV6_RECVPKTINFO;
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#else
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optname = IPV6_PKTINFO;
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#endif
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on = 1;
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if (setsockopt(s, IPPROTO_IPV6, optname, &on, sizeof(on)) < 0) {
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ipv6pktinfo_result = ISC_R_NOTFOUND;
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goto close;
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}
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close(s);
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ipv6pktinfo_result = ISC_R_SUCCESS;
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close:
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close(s);
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return;
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}
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static void
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initialize_ipv6pktinfo(void) {
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RUNTIME_CHECK(isc_once_do(&once_ipv6pktinfo,
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try_ipv6pktinfo) == ISC_R_SUCCESS);
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}
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#endif /* WANT_IPV6 */
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#endif /* ISC_PLATFORM_HAVEIPV6 */
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isc_result_t
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isc_net_probe_ipv6only(void) {
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#ifdef ISC_PLATFORM_HAVEIPV6
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#ifdef WANT_IPV6
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initialize_ipv6only();
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#else
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ipv6only_result = ISC_R_NOTFOUND;
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#endif
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#endif
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return (ipv6only_result);
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}
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isc_result_t
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isc_net_probe_ipv6pktinfo(void) {
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#ifdef ISC_PLATFORM_HAVEIPV6
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#ifdef WANT_IPV6
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initialize_ipv6pktinfo();
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#else
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ipv6pktinfo_result = ISC_R_NOTFOUND;
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#endif
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#endif
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return (ipv6pktinfo_result);
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}
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void
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isc_net_disableipv4(void) {
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initialize();
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if (ipv4_result == ISC_R_SUCCESS)
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ipv4_result = ISC_R_DISABLED;
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}
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void
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isc_net_disableipv6(void) {
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initialize();
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if (ipv6_result == ISC_R_SUCCESS)
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ipv6_result = ISC_R_DISABLED;
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}
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void
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isc_net_enableipv4(void) {
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initialize();
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if (ipv4_result == ISC_R_DISABLED)
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ipv4_result = ISC_R_SUCCESS;
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}
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void
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isc_net_enableipv6(void) {
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initialize();
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if (ipv6_result == ISC_R_DISABLED)
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ipv6_result = ISC_R_SUCCESS;
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}
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