Fetch an indication of whether the interface supports capturing in

monitor mode at the same time that we fetch its list of link-layer
types.  Support fetching that list in monitor mode, as the list may be
different in regular and monitor mode.  If the interface supports
monitor mode, when printing the list of link-layer types, indicate
whether they're fetched in monitor mode or not, as tcpdump 4.1.x does.

svn path=/trunk/; revision=32789

1 files changed, 15 insertions, 4 deletions

diff --git a/capture_ifinfo.h b/capture_ifinfo.h
index 28ebb5c701..e0cec1db7f 100644
--- a/capture_ifinfo.h
+++ b/capture_ifinfo.h
@@ -67,8 +67,17 @@ extern GList *capture_interface_list(int *err, char **err_str);
 void free_interface_list(GList *if_list);
 
 /*
- * The list of data link types returned by "get_pcap_linktype_list()" and
- * "capture_pcap_linktype_list()" is a list of these structures.
+ * "get_if_capabilities()" and "capture_if_capabilities()" return a pointer
+ * to an allocated instance of this structure.  "free_if_capabilities()"
+ * frees the returned instance.
+ */
+typedef struct {
+	gboolean	can_set_rfmon;	/* TRUE if can be put into monitor mode */
+	GList		*data_link_types;	/* GList of data_link_info_t's */
+} if_capabilities_t;
+
+/*
+ * Information about data link types.
  */
 typedef struct {
 	int	dlt;            /* e.g. DLT_EN10MB (which is 1) */
@@ -79,9 +88,11 @@ typedef struct {
 /**
  * Fetch the linktype list for the specified interface from a child process.
  */
-extern GList *capture_pcap_linktype_list(const char *devname, char **err_str);
+extern if_capabilities_t *
+capture_get_if_capabilities(const char *devname, gboolean monitor_mode,
+                            char **err_str);
 
-void free_pcap_linktype_list(GList *linktype_list);
+void free_if_capabilities(if_capabilities_t *caps);
 
 #endif /* HAVE_LIBPCAP */