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/*
* Copyright (C) 1999-2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: net.c,v 1.25 2001/11/30 01:59:45 gson Exp $ */
#include <config.h>
#include <errno.h>
#include <unistd.h>
#include <isc/net.h>
#include <isc/strerror.h>
#include <isc/string.h>
#include <isc/util.h>
#if defined(ISC_PLATFORM_HAVEIPV6) && defined(ISC_PLATFORM_NEEDIN6ADDRANY)
const struct in6_addr isc_net_in6addrany = IN6ADDR_ANY_INIT;
#endif
static isc_boolean_t once = ISC_FALSE;
static isc_result_t ipv4_result = ISC_R_NOTFOUND;
static isc_result_t ipv6_result = ISC_R_NOTFOUND;
static isc_result_t
try_proto(int domain) {
int s;
isc_result_t result = ISC_R_SUCCESS;
char strbuf[ISC_STRERRORSIZE];
s = socket(domain, SOCK_STREAM, 0);
if (s == -1) {
switch (errno) {
#ifdef EAFNOSUPPORT
case EAFNOSUPPORT:
#endif
#ifdef EPROTONOSUPPORT
case EPROTONOSUPPORT:
#endif
#ifdef EINVAL
case EINVAL:
#endif
return (ISC_R_NOTFOUND);
default:
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"socket() %s failed",
strbuf);
return (ISC_R_UNEXPECTED);
}
}
#ifdef ISC_PLATFORM_HAVEIPV6
#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
if (domain == PF_INET6) {
struct sockaddr_in6 sin6;
unsigned int len;
/*
* Check to see if IPv6 is broken, as is common on Linux.
*/
len = sizeof(sin6);
if (getsockname(s, (struct sockaddr *)&sin6, (void *)&len) < 0)
{
result = ISC_R_NOTFOUND;
} else {
if (len == sizeof(struct sockaddr_in6))
result = ISC_R_SUCCESS;
else {
result = ISC_R_NOTFOUND;
}
}
}
#endif
#endif
(void)close(s);
return (result);
}
static void
initialize_action(void) {
ipv4_result = try_proto(PF_INET);
#ifdef ISC_PLATFORM_HAVEIPV6
#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
ipv6_result = try_proto(PF_INET6);
#endif
#endif
}
static void
initialize(void) {
if(once == ISC_FALSE) {
initialize_action();
once = ISC_TRUE;
}
}
isc_result_t
isc_net_probeipv4(void) {
initialize();
return (ipv4_result);
}
isc_result_t
isc_net_probeipv6(void) {
initialize();
return (ipv6_result);
}
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