Link the dialog cell into internally generated requests from the dial…

…og module

Fixes #839

modules/dialog/dlg_req_within.c

@@ -133,6 +133,10 @@ dlg_t * build_dlg_t(struct dlg_cell * cell, int dst_leg, int src_leg)
 	td->state= DLG_CONFIRMED;
 	td->send_sock = cell->legs[dst_leg].bind_addr;
 
+	/* link the dialog cell here - it will eventually be linked
+	 * within the upcoming created transaction */
+	td->dialog_ctx = cell;
+
 	return td;
 
 error:
@@ -200,6 +204,10 @@ dlg_t * build_dialog_info(struct dlg_cell * cell, int dst_leg, int src_leg,char
 	td->state= DLG_CONFIRMED;
 	td->send_sock = cell->legs[dst_leg].bind_addr;
 
+	/* link the dialog cell here - it will eventually be linked
+	 * within the upcoming created transaction */
+	td->dialog_ctx = cell;
+
 	return td;
 
 error:

modules/tm/dlg.h

@@ -104,6 +104,7 @@ typedef struct dlg {
 				 * prevent repeated analyzing of the dialog data
 				 */
 	struct socket_info* send_sock;
+	void *dialog_ctx;       /* backpointer to dialog ctx */
 	struct usr_avp *avps;
 } dlg_t;
 

modules/tm/uac.c

@@ -236,6 +236,11 @@ int t_uac(str* method, str* headers, str* body, dlg_t* dialog,
 		goto error2;
 	}
 
+	/* if we have a dialog ctx, link it to the newly created transaction
+	 * we might need it later for accessing dialog specific info */
+	if (dialog->dialog_ctx)
+		new_cell->dialog_ctx = dialog->dialog_ctx;
+
 	/* pass the transaction flags from dialog to transaction */
 	new_cell->flags |= dialog->T_flags;