Commit e08daaff authored by Bob Halley's avatar Bob Halley
Browse files

add

parent ae27cfab
/*
* Copyright (C) 1999 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.
*/
#include <config.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <isc/assertions.h>
#include <isc/error.h>
#include <isc/net.h>
#include <isc/once.h>
static isc_once_t once = ISC_ONCE_INIT;
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;
s = socket(domain, SOCK_STREAM, 0);
if (s == -1) {
switch (errno) {
#ifdef EAFNOSUPPORT
case EAFNOSUPPORT:
#endif
#ifdef EINVAL
case EINVAL:
#endif
return (ISC_R_NOTFOUND);
default:
UNEXPECTED_ERROR(__FILE__, __LINE__,
"socket() failed: %s",
strerror(errno));
return (ISC_R_UNEXPECTED);
}
}
close (s);
return (ISC_R_SUCCESS);
}
static void
initialize_action(void) {
ipv4_result = try_proto(PF_INET);
#ifdef ISC_NET_HAVEIPV6
ipv6_result = try_proto(PF_INET6);
#endif
}
static void
initialize(void) {
RUNTIME_CHECK(isc_once_do(&once, initialize_action) == ISC_R_SUCCESS);
}
isc_result_t
isc_net_haveipv4(void) {
/*
* Check if the system's kernel supports IPv4.
*/
initialize();
return (ipv4_result);
}
isc_result_t
isc_net_haveipv6(void) {
/*
* Check if the system's kernel supports IPv6.
*/
initialize();
return (ipv6_result);
}
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