Avoid stack overflow when handling nested captures

The C code uses recursion to handle nested captures, so a too deep
nesting could create a stack overflow. The fix limits the handling
of nested captures to 'MAXRECLEVEL' (default is 200 levels).

1 files changed, 1 insertions, 0 deletions

diff --git a/lpcap.h b/lpcap.h
index bf52b67..dc10d69 100644
--- a/lpcap.h
+++ b/lpcap.h
@@ -44,6 +44,7 @@ typedef struct CapState {
   int ptop;  /* index of last argument to 'match' */
   const char *s;  /* original string */
   int valuecached;  /* value stored in cache slot */
+  int reclevel;  /* recursion level */
 } CapState;