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-rw-r--r--lib/isc/unix/net.c367
1 files changed, 367 insertions, 0 deletions
diff --git a/lib/isc/unix/net.c b/lib/isc/unix/net.c
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+++ b/lib/isc/unix/net.c
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+/*
+ * Copyright (C) 2004, 2005, 2007 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 1.29.18.6 2007/09/13 23:46:26 tbox Exp $ */
+
+#include <config.h>
+
+#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>
+
+#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);
+}
+
+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;
+}
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