/* * Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC") * Copyright (C) 1999-2003 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 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 1.22.2.2.10.7 2004/04/29 01:31:22 marka Exp $ */ #include #include #include #include #include #include #include #include #if defined(ISC_PLATFORM_HAVEIPV6) && defined(ISC_PLATFORM_NEEDIN6ADDRANY) const struct in6_addr isc_net_in6addrany = IN6ADDR_ANY_INIT; #endif #if defined(ISC_PLATFORM_HAVEIPV6) && defined(ISC_PLATFORM_NEEDIN6ADDRLOOPBACK) const struct in6_addr isc_net_in6addrloop = IN6ADDR_LOOPBACK_INIT; #endif static isc_boolean_t once = ISC_FALSE; static isc_once_t once_ipv6only = ISC_ONCE_INIT; static isc_once_t once_ipv6pktinfo = 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 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() failed: %s", strbuf); return (ISC_R_UNEXPECTED); } } #ifdef ISC_PLATFORM_HAVEIPV6 #ifdef WANT_IPV6 #ifdef ISC_PLATFORM_HAVEIN6PKTINFO if (domain == PF_INET6) { struct sockaddr_in6 sin6; GETSOCKNAME_SOCKLEN_TYPE len; /* * Check to see if IPv6 is broken, as is common on Linux. */ len = sizeof(sin6); if (getsockname(s, (struct sockaddr *)&sin6, &len) < 0) { result = ISC_R_NOTFOUND; } else { if (len == sizeof(struct sockaddr_in6)) result = ISC_R_SUCCESS; else { 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 } 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); } #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() failed: %s", 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() failed: %s", 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); } 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() failed: %s", 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 /* WANT_IPV6 */ #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 WANT_IPV6 initialize_ipv6pktinfo(); #else ipv6pktinfo_result = ISC_R_NOTFOUND; #endif #endif return (ipv6pktinfo_result); } 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; }