From 6fc85c49ab44929695cb2b120e8a680d5cab6729 Mon Sep 17 00:00:00 2001
From: Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
Date: Thu, 5 Jun 2014 09:35:38 +0000
Subject: [PATCH] added function to compare struct sockaddr's

git-svn-id: https://zerberus.eonerc.rwth-aachen.de:8443/svn/s2ss/trunk@59 8ec27952-4edc-4aab-86aa-e87bb2611832
---
 include/utils.h | 14 ++++++++++++++
 src/utils.c     | 23 +++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/include/utils.h b/include/utils.h
index 85c7b1611..12d9bce2e 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -15,6 +15,7 @@
 
 struct config;
 struct sockaddr_in;
+struct sockaddr;
 
 /// The log level which is passed as first argument to print()
 enum log_level
@@ -55,6 +56,19 @@ int resolve_addr(const char *addr, struct sockaddr_in *sa, int flags);
  */
 void init_realtime(struct config *g);
 
+/** Compare two socket addresses based on their family and address.
+ *
+ * Only the family and the address is compared.
+ * Port numbers etc are ignored.
+ *
+ * @param a First address
+ * @param b Second address
+ * @return
+ *  - 0 if the addresses are equal
+ *  - otherwise they are not equal
+ */
+int sockaddr_cmp(struct sockaddr *a, struct sockaddr *b);
+
 /// Check assertion and exit if failed.
 #define assert(exp) do { \
 	if (!(exp)) { \
diff --git a/src/utils.c b/src/utils.c
index 72c4852ee..a753d1a93 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -90,6 +90,29 @@ int resolve_addr(const char *addr, struct sockaddr_in *sa, int flags)
 	return 0;
 }
 
+int sockaddr_cmp(struct sockaddr *a, struct sockaddr *b)
+{
+	if (a->sa_family == b->sa_family) {
+		switch (a->sa_family) {
+			case AF_INET: {
+				struct sockaddr_in *ai = (struct sockaddr_in *) a;
+				struct sockaddr_in *bi = (struct sockaddr_in *) b;
+
+				return memcmp(&ai->sin_addr, &bi->sin_addr, sizeof(struct in_addr));
+			}
+
+			case AF_INET6: {
+				struct sockaddr_in6 *ai = (struct sockaddr_in6 *) a;
+				struct sockaddr_in6 *bi = (struct sockaddr_in6 *) b;
+
+				return memcmp(&ai->sin6_addr, &bi->sin6_addr, sizeof(struct in6_addr));
+			}
+		}
+	}
+
+	return -1;
+}
+
 static cpu_set_t to_cpu_set_t(int set)
 {
 	cpu_set_t cset;