/contrib/bind9/lib/isc/unix/net.c
C | 524 lines | 418 code | 70 blank | 36 comment | 63 complexity | be39dbb13a407cb2cc7f85e05423c5d9 MD5 | raw file
Possible License(s): MPL-2.0-no-copyleft-exception, BSD-3-Clause, LGPL-2.0, LGPL-2.1, BSD-2-Clause, 0BSD, JSON, AGPL-1.0, GPL-2.0
- /*
- * Copyright (C) 2004, 2005, 2007, 2008, 2012 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.
- */
- /* $Id$ */
- #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;
- }