net: sockets: Fix getsockname() for TCP

The local address used for established TCP socket needs to be
dig out from TCP internals and not from context->local.

Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>

Author: jukkar

subsys/net/lib/sockets/sockets.c

@@ -3484,6 +3484,7 @@ int zsock_getsockname_ctx(struct net_context *ctx, struct sockaddr *addr,
 			  socklen_t *addrlen)
 {
 	socklen_t newlen = 0;
+	int ret;
 
 	if (IS_ENABLED(CONFIG_NET_IPV4) && ctx->local.family == AF_INET) {
 		struct sockaddr_in addr4 = { 0 };
@@ -3492,27 +3493,33 @@ int zsock_getsockname_ctx(struct net_context *ctx, struct sockaddr *addr,
 			SET_ERRNO(-EINVAL);
 		}
 
-		addr4.sin_family = AF_INET;
-		addr4.sin_port = net_sin_ptr(&ctx->local)->sin_port;
-		memcpy(&addr4.sin_addr, net_sin_ptr(&ctx->local)->sin_addr,
-		       sizeof(struct in_addr));
 		newlen = sizeof(struct sockaddr_in);
 
+		ret = net_context_get_local_addr(ctx,
+						 (struct sockaddr *)&addr4,
+						 &newlen);
+		if (ret < 0) {
+			SET_ERRNO(-ret);
+		}
+
 		memcpy(addr, &addr4, MIN(*addrlen, newlen));
-	} else if (IS_ENABLED(CONFIG_NET_IPV6) &&
-		   ctx->local.family == AF_INET6) {
+
+	} else if (IS_ENABLED(CONFIG_NET_IPV6) && ctx->local.family == AF_INET6) {
 		struct sockaddr_in6 addr6 = { 0 };
 
 		if (net_sin6_ptr(&ctx->local)->sin6_addr == NULL) {
 			SET_ERRNO(-EINVAL);
 		}
 
-		addr6.sin6_family = AF_INET6;
-		addr6.sin6_port = net_sin6_ptr(&ctx->local)->sin6_port;
-		memcpy(&addr6.sin6_addr, net_sin6_ptr(&ctx->local)->sin6_addr,
-		       sizeof(struct in6_addr));
 		newlen = sizeof(struct sockaddr_in6);
 
+		ret = net_context_get_local_addr(ctx,
+						 (struct sockaddr *)&addr6,
+						 &newlen);
+		if (ret < 0) {
+			SET_ERRNO(-ret);
+		}
+
 		memcpy(addr, &addr6, MIN(*addrlen, newlen));
 	} else {
 		SET_ERRNO(-EINVAL);