example: iterate GUIDs

examples/dnguids.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+#
+# Iterate GUIDs and display one per line.
+
+import sys
+
+import dnfile
+
+
+def show_guids(fname):
+    # parse .NET executable
+    dn = dnfile.dnPE(fname, clr_lazy_load=True)
+    # if no CLR data found, do nothing
+    if not hasattr(dn, "net"):
+        return
+
+    # get the (first) GUID stream
+    g: dnfile.stream.GuidHeap = dn.net.metadata.streams.get(b"#GUID", None)
+    if g:
+        # get size of the stream
+        size = g.sizeof() // 16
+        print(f"INFO: size={size}")
+        offset = 1
+        # while there is still data in the stream
+        while offset <= size:
+            # read the guid
+            item = g.get(offset)
+            if item is None:
+                rva = g.rva + (offset * 16)
+                print(f"Bad GUID: rva=0x{rva:08x}")
+                break
+
+            print(item)
+            # continue to next entry
+            offset += 1
+
+
+# for each filepath provided on command-line
+for fname in sys.argv[1:]:
+    show_guids(fname)