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-rw-r--r--libc/inet/check_pf.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/libc/inet/check_pf.c b/libc/inet/check_pf.c
new file mode 100644
index 000000000..b6c93783a
--- /dev/null
+++ b/libc/inet/check_pf.c
@@ -0,0 +1,65 @@
+/* Determine protocol families for which interfaces exist. Generic version.
+ Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <features.h>
+#include <ifaddrs.h>
+#include <netdb.h>
+
+
+void
+attribute_hidden
+__check_pf (bool *seen_ipv4, bool *seen_ipv6)
+{
+ *seen_ipv4 = false;
+ *seen_ipv6 = false;
+#if __UCLIBC_SUPPORT_AI_ADDRCONFIG__
+ {
+ /* Get the interface list via getifaddrs. */
+ struct ifaddrs *ifa = NULL;
+ struct ifaddrs *runp;
+ if (getifaddrs (&ifa) != 0)
+ {
+ /* We cannot determine what interfaces are available. Be
+ optimistic. */
+ *seen_ipv4 = true;
+#if __UCLIBC_HAS_IPV6__
+ *seen_ipv6 = true;
+#endif /* __UCLIBC_HAS_IPV6__ */
+ return;
+ }
+
+ for (runp = ifa; runp != NULL; runp = runp->ifa_next)
+ if (runp->ifa_addr->sa_family == PF_INET)
+ *seen_ipv4 = true;
+#if __UCLIBC_HAS_IPV6__
+ else if (runp->ifa_addr->sa_family == PF_INET6)
+ *seen_ipv6 = true;
+#endif /* __UCLIBC_HAS_IPV6__ */
+
+ (void) freeifaddrs (ifa);
+ }
+#else
+ /* AI_ADDRCONFIG is disabled, assume both ipv4 and ipv6 available. */
+ *seen_ipv4 = true;
+#if __UCLIBC_HAS_IPV6__
+ *seen_ipv6 = true;
+#endif /* __UCLIBC_HAS_IPV6__ */
+
+#endif /* __UCLIBC_SUPPORT_AI_ADDRCONFIG__ */
+}