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124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*
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* Copyright (C) 1999-2001 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 INTERNET SOFTWARE CONSORTIUM
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: net.c,v 1.25 2001/11/30 01:59:45 gson 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/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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static isc_boolean_t once = ISC_FALSE;
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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
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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() %s failed",
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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 ISC_PLATFORM_HAVEIN6PKTINFO
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if (domain == PF_INET6) {
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struct sockaddr_in6 sin6;
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unsigned int 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, (void *)&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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(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 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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}
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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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