/*
* Copyright (C) 2004, 2005, 2007, 2008 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2003 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC 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 1.40 2008/07/04 05:52:31 each Exp $ */
#include <config.h>
#include <sys/types.h>
#if defined(HAVE_SYS_SYSCTL_H)
#if defined(HAVE_SYS_PARAM_H)
#include <sys/param.h>
#endif
#include <sys/sysctl.h>
#endif
#include <errno.h>
#include <unistd.h>
#include <isc/log.h>
#include <isc/msgs.h>
#include <isc/net.h>
#include <isc/once.h>
#include <isc/strerror.h>
#include <isc/string.h>
#include <isc/util.h>
/*%
* Definitions about UDP port range specification. This is a total mess of
* portability variants: some use sysctl (but the sysctl names vary), some use
* system-specific interfaces, some have the same interface for IPv4 and IPv6,
* some separate them, etc...
*/
/*%
* The last resort defaults: use all non well known port space
*/
#ifndef ISC_NET_PORTRANGELOW
#define ISC_NET_PORTRANGELOW 1024
#endif /* ISC_NET_PORTRANGELOW */
#ifndef ISC_NET_PORTRANGEHIGH
#define ISC_NET_PORTRANGEHIGH 65535
#endif /* ISC_NET_PORTRANGEHIGH */
#ifdef HAVE_SYSCTLBYNAME
/*%
* sysctl variants
*/
#if defined(__FreeBSD__) || defined(__APPLE__) || defined(__DragonFly__)
#define USE_SYSCTL_PORTRANGE
#define SYSCTL_V4PORTRANGE_LOW "net.inet.ip.portrange.hifirst"
#define SYSCTL_V4PORTRANGE_HIGH "net.inet.ip.portrange.hilast"
#define SYSCTL_V6PORTRANGE_LOW "net.inet.ip.portrange.hifirst"
#define SYSCTL_V6PORTRANGE_HIGH "net.inet.ip.portrange.hilast"
#endif
#ifdef __NetBSD__
#define USE_SYSCTL_PORTRANGE
#define SYSCTL_V4PORTRANGE_LOW "net.inet.ip.anonportmin"
#define SYSCTL_V4PORTRANGE_HIGH "net.inet.ip.anonportmax"
#define SYSCTL_V6PORTRANGE_LOW "net.inet6.ip6.anonportmin"
#define SYSCTL_V6PORTRANGE_HIGH "net.inet6.ip6.anonportmax"
#endif
#else /* !HAVE_SYSCTLBYNAME */
#ifdef __OpenBSD__
#define USE_SYSCTL_PORTRANGE
#define SYSCTL_V4PORTRANGE_LOW { CTL_NET, PF_INET, IPPROTO_IP, \
IPCTL_IPPORT_HIFIRSTAUTO }
#define SYSCTL_V4PORTRANGE_HIGH { CTL_NET, PF_INET, IPPROTO_IP, \
IPCTL_IPPORT_HILASTAUTO }
/* Same for IPv6 */
#define SYSCTL_V6PORTRANGE_LOW SYSCTL_V4PORTRANGE_LOW
#define SYSCTL_V6PORTRANGE_HIGH SYSCTL_V4PORTRANGE_HIGH
#endif
#endif /* HAVE_SYSCTLBYNAME */
#if defined(ISC_PLATFORM_HAVEIPV6)
# if defined(ISC_PLATFORM_NEEDIN6ADDRANY)
const struct in6_addr isc_net_in6addrany = IN6ADDR_ANY_INIT;
# endif
# if defined(ISC_PLATFORM_NEEDIN6ADDRLOOPBACK)
const struct in6_addr isc_net_in6addrloop = IN6ADDR_LOOPBACK_INIT;
# endif
# if defined(WANT_IPV6)
static isc_once_t once_ipv6only = ISC_ONCE_INIT;
# endif
# if defined(ISC_PLATFORM_HAVEIN6PKTINFO)
static isc_once_t once_ipv6pktinfo = ISC_ONCE_INIT;
# endif
#endif /* ISC_PLATFORM_HAVEIPV6 */
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 unix_result = ISC_R_NOTFOUND;
static isc_result_t ipv6only_result = ISC_R_NOTFOUND;
static isc_result_t ipv6pktinfo_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: %s",
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_GENERAL,
ISC_MSG_FAILED,
"failed"),
strbuf);
return (ISC_R_UNEXPECTED);
}
}
#ifdef ISC_PLATFORM_HAVEIPV6
#ifdef WANT_IPV6
#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)
{
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
"retrieving the address of an IPv6 "
"socket from the kernel failed.");
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
"IPv6 is not supported.");
result = ISC_R_NOTFOUND;
} else {
if (len == sizeof(struct sockaddr_in6))
result = ISC_R_SUCCESS;
else {
isc_log_write(isc_lctx,
ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET,
ISC_LOG_ERROR,
"IPv6 structures in kernel and "
"user space do not match.");
isc_log_write(isc_lctx,
ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET,
ISC_LOG_ERROR,
"IPv6 is not supported.");
result = ISC_R_NOTFOUND;
}
}
}
#endif
#endif
#endif
(void)close(s);
return (result);
}
static void
initialize_action(void) {
ipv4_result = try_proto(PF_INET);
#ifdef ISC_PLATFORM_HAVEIPV6
#ifdef WANT_IPV6
#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
ipv6_result = try_proto(PF_INET6);
#endif
#endif
#endif
#ifdef ISC_PLATFORM_HAVESYSUNH
unix_result = try_proto(PF_UNIX);
#endif
}
static void
initialize(void) {
RUNTIME_CHECK(isc_once_do(&once, initialize_action) == ISC_R_SUCCESS);
}
isc_result_t
isc_net_probeipv4(void) {
initialize();
return (ipv4_result);
}
isc_result_t
isc_net_probeipv6(void) {
initialize();
return (ipv6_result);
}
isc_result_t
isc_net_probeunix(void) {
initialize();
return (unix_result);
}
#ifdef ISC_PLATFORM_HAVEIPV6
#ifdef WANT_IPV6
static void
try_ipv6only(void) {
#ifdef IPV6_V6ONLY
int s, on;
char strbuf[ISC_STRERRORSIZE];
#endif
isc_result_t result;
result = isc_net_probeipv6();
if (result != ISC_R_SUCCESS) {
ipv6only_result = result;
return;
}
#ifndef IPV6_V6ONLY
ipv6only_result = ISC_R_NOTFOUND;
return;
#else
/* check for TCP sockets */
s = socket(PF_INET6, SOCK_STREAM, 0);
if (s == -1) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"socket() %s: %s",
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_GENERAL,
ISC_MSG_FAILED,
"failed"),
strbuf);
ipv6only_result = ISC_R_UNEXPECTED;
return;
}
on = 1;
if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
ipv6only_result = ISC_R_NOTFOUND;
goto close;
}
close(s);
/* check for UDP sockets */
s = socket(PF_INET6, SOCK_DGRAM, 0);
if (s == -1) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"socket() %s: %s",
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_GENERAL,
ISC_MSG_FAILED,
"failed"),
strbuf);
ipv6only_result = ISC_R_UNEXPECTED;
return;
}
on = 1;
if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
ipv6only_result = ISC_R_NOTFOUND;
goto close;
}
close(s);
ipv6only_result = ISC_R_SUCCESS;
close:
close(s);
return;
#endif /* IPV6_V6ONLY */
}
static void
initialize_ipv6only(void) {
RUNTIME_CHECK(isc_once_do(&once_ipv6only,
try_ipv6only) == ISC_R_SUCCESS);
}
#endif /* WANT_IPV6 */
#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
static void
try_ipv6pktinfo(void) {
int s, on;
char strbuf[ISC_STRERRORSIZE];
isc_result_t result;
int optname;
result = isc_net_probeipv6();
if (result != ISC_R_SUCCESS) {
ipv6pktinfo_result = result;
return;
}
/* we only use this for UDP sockets */
s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if (s == -1) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"socket() %s: %s",
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_GENERAL,
ISC_MSG_FAILED,
"failed"),
strbuf);
ipv6pktinfo_result = ISC_R_UNEXPECTED;
return;
}
#ifdef IPV6_RECVPKTINFO
optname = IPV6_RECVPKTINFO;
#else
optname = IPV6_PKTINFO;
#endif
on = 1;
if (setsockopt(s, IPPROTO_IPV6, optname, &on, sizeof(on)) < 0) {
ipv6pktinfo_result = ISC_R_NOTFOUND;
goto close;
}
close(s);
ipv6pktinfo_result = ISC_R_SUCCESS;
close:
close(s);
return;
}
static void
initialize_ipv6pktinfo(void) {
RUNTIME_CHECK(isc_once_do(&once_ipv6pktinfo,
try_ipv6pktinfo) == ISC_R_SUCCESS);
}
#endif /* ISC_PLATFORM_HAVEIN6PKTINFO */
#endif /* ISC_PLATFORM_HAVEIPV6 */
isc_result_t
isc_net_probe_ipv6only(void) {
#ifdef ISC_PLATFORM_HAVEIPV6
#ifdef WANT_IPV6
initialize_ipv6only();
#else
ipv6only_result = ISC_R_NOTFOUND;
#endif
#endif
return (ipv6only_result);
}
isc_result_t
isc_net_probe_ipv6pktinfo(void) {
#ifdef ISC_PLATFORM_HAVEIPV6
#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
#ifdef WANT_IPV6
initialize_ipv6pktinfo();
#else
ipv6pktinfo_result = ISC_R_NOTFOUND;
#endif
#endif
#endif
return (ipv6pktinfo_result);
}
#if defined(USE_SYSCTL_PORTRANGE)
#if defined(HAVE_SYSCTLBYNAME)
static isc_result_t
getudpportrange_sysctl(int af, in_port_t *low, in_port_t *high) {
int port_low, port_high;
size_t portlen;
const char *sysctlname_lowport, *sysctlname_hiport;
if (af == AF_INET) {
sysctlname_lowport = SYSCTL_V4PORTRANGE_LOW;
sysctlname_hiport = SYSCTL_V4PORTRANGE_HIGH;
} else {
sysctlname_lowport = SYSCTL_V6PORTRANGE_LOW;
sysctlname_hiport = SYSCTL_V6PORTRANGE_HIGH;
}
portlen = sizeof(portlen);
if (sysctlbyname(sysctlname_lowport, &port_low, &portlen,
NULL, 0) < 0) {
return (ISC_R_FAILURE);
}
portlen = sizeof(portlen);
if (sysctlbyname(sysctlname_hiport, &port_high, &portlen,
NULL, 0) < 0) {
return (ISC_R_FAILURE);
}
if ((port_low & ~0xffff) != 0 || (port_high & ~0xffff) != 0)
return (ISC_R_RANGE);
*low = (in_port_t)port_low;
*high = (in_port_t)port_high;
return (ISC_R_SUCCESS);
}
#else /* !HAVE_SYSCTLBYNAME */
static isc_result_t
getudpportrange_sysctl(int af, in_port_t *low, in_port_t *high) {
int mib_lo4[4] = SYSCTL_V4PORTRANGE_LOW;
int mib_hi4[4] = SYSCTL_V4PORTRANGE_HIGH;
int mib_lo6[4] = SYSCTL_V6PORTRANGE_LOW;
int mib_hi6[4] = SYSCTL_V6PORTRANGE_HIGH;
int *mib_lo, *mib_hi, miblen;
int port_low, port_high;
size_t portlen;
if (af == AF_INET) {
mib_lo = mib_lo4;
mib_hi = mib_hi4;
miblen = sizeof(mib_lo4) / sizeof(mib_lo4[0]);
} else {
mib_lo = mib_lo6;
mib_hi = mib_hi6;
miblen = sizeof(mib_lo6) / sizeof(mib_lo6[0]);
}
portlen = sizeof(portlen);
if (sysctl(mib_lo, miblen, &port_low, &portlen, NULL, 0) < 0) {
return (ISC_R_FAILURE);
}
portlen = sizeof(portlen);
if (sysctl(mib_hi, miblen, &port_high, &portlen, NULL, 0) < 0) {
return (ISC_R_FAILURE);
}
if ((port_low & ~0xffff) != 0 || (port_high & ~0xffff) != 0)
return (ISC_R_RANGE);
*low = (in_port_t) port_low;
*high = (in_port_t) port_high;
return (ISC_R_SUCCESS);
}
#endif /* HAVE_SYSCTLBYNAME */
#endif /* USE_SYSCTL_PORTRANGE */
isc_result_t
isc_net_getudpportrange(int af, in_port_t *low, in_port_t *high) {
int result = ISC_R_FAILURE;
REQUIRE(low != NULL && high != NULL);
#if defined(USE_SYSCTL_PORTRANGE)
result = getudpportrange_sysctl(af, low, high);
#else
UNUSED(af);
#endif
if (result != ISC_R_SUCCESS) {
*low = ISC_NET_PORTRANGELOW;
*high = ISC_NET_PORTRANGEHIGH;
}
return (ISC_R_SUCCESS); /* we currently never fail in this function */
}
void
isc_net_disableipv4(void) {
initialize();
if (ipv4_result == ISC_R_SUCCESS)
ipv4_result = ISC_R_DISABLED;
}
void
isc_net_disableipv6(void) {
initialize();
if (ipv6_result == ISC_R_SUCCESS)
ipv6_result = ISC_R_DISABLED;
}
void
isc_net_enableipv4(void) {
initialize();
if (ipv4_result == ISC_R_DISABLED)
ipv4_result = ISC_R_SUCCESS;
}
void
isc_net_enableipv6(void) {
initialize();
if (ipv6_result == ISC_R_DISABLED)
ipv6_result = ISC_R_SUCCESS;
}
