pv: added $rv returning protocol version

- return the string representing the protocol version in first line of
  request/reply

modules_k/pv/pv.c

@@ -303,6 +303,9 @@ static pv_export_t mod_pvs[] = {
 	{{"ruri.user", (sizeof("ruri.user")-1)}, /* */
 		PVT_RURI_USERNAME, pv_get_ruri_attr, pv_set_ruri_user,
 		0, 0, pv_init_iname, 1},
+	{{"rv", (sizeof("rv")-1)}, /* */
+		PVT_OTHER, pv_get_version, 0,
+		0, 0, 0, 0},
 	{{"Ri", (sizeof("Ri")-1)}, /* */
 		PVT_OTHER, pv_get_rcvip, 0,
 		0, 0, 0, 0},

modules_k/pv/pv_core.c

@@ -127,6 +127,22 @@ int pv_get_method(struct sip_msg *msg, pv_param_t *param,
 			get_cseq(msg)->method_id);
 }
 
+int pv_get_version(struct sip_msg *msg, pv_param_t *param,
+		pv_value_t *res)
+{
+	if(msg==NULL)
+		return -1;
+
+	if(msg->first_line.type == SIP_REQUEST)
+	{
+		return pv_get_strval(msg, param, res,
+				&msg->first_line.u.request.version);
+	}
+
+	return pv_get_strval(msg, param, res,
+				&msg->first_line.u.reply.version);
+}
+
 int pv_get_status(struct sip_msg *msg, pv_param_t *param,
 		pv_value_t *res)
 {

modules_k/pv/pv_core.h

@@ -190,6 +190,9 @@ int pv_get_scriptvar(struct sip_msg *msg,  pv_param_t *param,
 int pv_get_true(struct sip_msg *msg, pv_param_t *param,
 		pv_value_t *res);
 
+int pv_get_version(struct sip_msg *msg, pv_param_t *param,
+		pv_value_t *res);
+
 /********* end PV get functions *********/
 
 /********* start PV set functions *********/