summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--src/pgm/inet_lnaof.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/src/pgm/inet_lnaof.c b/src/pgm/inet_lnaof.c
new file mode 100644
index 0000000..e29e3cf
--- /dev/null
+++ b/src/pgm/inet_lnaof.c
@@ -0,0 +1,84 @@
+/* vim:ts=8:sts=8:sw=4:noai:noexpandtab
+ *
+ * Portable implementation of inet_lnaof.
+ *
+ * Copyright (c) 2006-2012 Miru Limited.
+ *
+ * This 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.
+ *
+ * This 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#ifndef _WIN32
+# include <sys/types.h>
+# include <sys/socket.h>
+#endif
+#include <impl/framework.h>
+#include <impl/inet_lnaof.h>
+
+
+//#define INET_LNAOF_DEBUG
+
+/* Equivalent to the description of inet_lnaof(), extract the host
+ * address out of an IP address.
+ * hostaddr = inet_lnaof(addr)
+ *
+ * nb: lnaof = local network address of
+ *
+ * returns TRUE if host address is defined, FALSE if only network address.
+ */
+bool
+pgm_inet_lnaof (
+ struct in_addr* restrict dst, /* host byte order */
+ const struct in_addr* restrict src,
+ const struct in_addr* restrict netmask
+ )
+{
+ bool has_lna = FALSE;
+
+ pgm_assert (NULL != dst);
+ pgm_assert (NULL != src);
+ pgm_assert (NULL != netmask);
+
+ dst->s_addr = src->s_addr & netmask->s_addr;
+ has_lna = (0 != (src->s_addr & ~netmask->s_addr));
+
+ return has_lna;
+}
+
+bool
+pgm_inet6_lnaof (
+ struct in6_addr* restrict dst,
+ const struct in6_addr* restrict src,
+ const struct in6_addr* restrict netmask
+ )
+{
+ bool has_lna = FALSE;
+
+ pgm_assert (NULL != dst);
+ pgm_assert (NULL != src);
+ pgm_assert (NULL != netmask);
+
+ for (unsigned i = 0; i < 16; i++) {
+ dst->s6_addr[i] = src->s6_addr[i] & netmask->s6_addr[i];
+ has_lna |= (0 != (src->s6_addr[i] & !netmask->s6_addr[i]));
+ }
+
+ return has_lna;
+}
+
+/* eof */