core: enhance error log for un-parsable msg by adding the source IP a…

…nd port

(cherry picked from commit 57e6092)

receive.c

@@ -88,6 +88,7 @@ int receive_msg(char* buf, unsigned int len, struct receive_info* rcv_info)
 {
 	struct sip_msg* msg;
 	struct timeval start;
+	char *tmp;
 
 	msg=pkg_malloc(sizeof(struct sip_msg));
 	if (msg==0) {
@@ -108,7 +109,8 @@ int receive_msg(char* buf, unsigned int len, struct receive_info* rcv_info)
 	msg->set_global_port=default_global_port;
 
 	if (parse_msg(buf,len, msg)!=0){
-		LM_ERR("parse_msg failed\n");
+		tmp=ip_addr2a(&(rcv_info->src_ip));
+		LM_ERR("Unable to parse msg received from [%s:%d]\n", tmp, rcv_info->src_port);
 		/* if a REQUEST msg was detected (first line was succesfully parsed) we
 		   should trigger the error route */
 		if ( msg->first_line.type==SIP_REQUEST && error_rlist.a!=NULL )