add isc_sockaddr_equal()

lib/isc/sockaddr.c

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 1999  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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM 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.
+ */
+
+#include <config.h>
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <isc/types.h>
+#include <isc/assertions.h>
+#include <isc/error.h>
+#include <isc/sockaddr.h>
+
+isc_boolean_t
+isc_sockaddr_equal(isc_sockaddr_t *a, isc_sockaddr_t *b)
+{
+	struct sockaddr *sa, *sb;
+
+	sa = (struct sockaddr *)&a->type;
+	sb = (struct sockaddr *)&b->type;
+
+	if (sa->sa_family != sb->sa_family)
+		return (ISC_FALSE);
+
+#ifdef HAVE_SA_LEN
+	if (sa->sa_len != sb->sa_len)
+		return (ISC_FALSE);
+	if (memcmp(sa->sa_data, sb->sa_data, sa->sa_len) != 0)
+		return (ISC_FALSE);
+#else
+	switch (sa->sa_family) {
+	case AF_INET: {
+		struct sockaddr_in *sina, *sinb;
+
+		sina = (struct sockaddr_in)sa;
+		sinb = (struct sockaddr_in)sb;
+
+		if (sina->sin_port != sinb->sin_port)
+			return (ISC_FALSE);
+		if (memcmp(&sina->sin_addr, &sinb->sin_addr, 4) != 0)
+			return (ISC_FALSE);
+
+		return (ISC_TRUE);
+	}
+	default:
+		INSIST("Unknown socket protocol");
+		break;
+	}
+
+#endif
+
+	UNEXPECTED_ERROR(__FILE__, __LINE__, "Cannot happen");
+	return (ISC_FALSE);
+}