core: execute event_route[core:receive-parse-error] block on error of initial sip message parsing

- note that the SIP message is broken in this case, but it gets access
  to source and local socket addresses (ip, port, proto, af) as well as
  the whole message buffer and its size

events.c

@@ -27,11 +27,46 @@
 
 #include "dprint.h"
 #include "mem/mem.h"
+#include "route.h"
 #include "events.h"
 
 static sr_event_cb_t _sr_events_list;
 static int _sr_events_inited = 0;
 
+typedef struct _sr_core_ert {
+	int init_parse_error;
+} sr_core_ert_t;
+
+static sr_core_ert_t _sr_core_ert_list;
+
+/**
+ *
+ */
+void sr_core_ert_init(void)
+{
+	memset(&_sr_core_ert_list, 0, sizeof(sr_core_ert_t));
+	/* 0 - is not a valid index in event_route blocks list */
+	_sr_core_ert_list.init_parse_error = route_get(&event_rt,
+											"core:receive-parse-error");
+	if(_sr_core_ert_list.init_parse_error>=0
+			&& event_rt.rlist[_sr_core_ert_list.init_parse_error]!=NULL) {
+		_sr_core_ert_list.init_parse_error = -1;
+	}
+}
+
+/**
+ *
+ */
+void sr_core_ert_run(sip_msg_t *msg, int e)
+{
+	switch(e) {
+		case SR_CORE_ERT_RECEIVE_PARSE_ERROR:
+			if(likely(_sr_core_ert_list.init_parse_error<=0))
+				return;
+		break;
+	}
+}
+
 /**
  *
  */

events.h

@@ -59,4 +59,12 @@ int sr_event_register_cb(int type, sr_event_cb_f f);
 int sr_event_exec(int type, void *data);
 int sr_event_enabled(int type);
 
+
+/* shortcut types for core event routes */
+/* initial parsing error in message receive function */
+#define SR_CORE_ERT_RECEIVE_PARSE_ERROR		1
+
+void sr_core_ert_init(void);
+void sr_core_ert_run(sip_msg_t *msg, int e);
+
 #endif

main.c

@@ -145,6 +145,7 @@
 #include "script_cb.h"
 #include "nonsip_hooks.h"
 #include "ut.h"
+#include "events.h"
 #include "signals.h"
 #ifdef USE_RAW_SOCKS
 #include "raw_sock.h"
@@ -2253,6 +2254,9 @@ try_again:
 	if (pv_reinit_buffer()<0)
 		goto error;
 
+	/* init lookup for core event routes */
+	sr_core_ert_init();
+
 	if (dont_fork_cnt)
 		dont_fork = dont_fork_cnt;	/* override by command line */
 

receive.c

@@ -146,6 +146,7 @@ int receive_msg(char* buf, unsigned int len, struct receive_info* rcv_info)
 				"core parsing of SIP message failed (%s:%d/%d)\n",
 				ip_addr2a(&msg->rcv.src_ip), (int)msg->rcv.src_port,
 				(int)msg->rcv.proto);
+		sr_core_ert_run(msg, SR_CORE_ERT_RECEIVE_PARSE_ERROR);
 		goto error02;
 	}
 	DBG("After parse_msg...\n");