lib/fuzzing/decode_ndr_X_crash: guess the pipe from filename

Usually we are dealing with a filename that tells you what the pipe is,
and there is no reason for this debug helper not to be convenient

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15625

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
(cherry picked from commit 8b6a584170eeb5082a188879be88e5f414b0be81)

diff --git a/lib/fuzzing/decode_ndr_X_crash b/lib/fuzzing/decode_ndr_X_crash
index 63c3cd747d701bb7386a944161c14a247b498068..d90e7efe122331c070d6a1db3de5a5cadde771bb 100755 (executable)
--- a/lib/fuzzing/decode_ndr_X_crash
+++ b/lib/fuzzing/decode_ndr_X_crash
@@ -61,8 +61,9 @@ def process_one_file(f):
 
 def main():
     parser = argparse.ArgumentParser()
-    parser.add_argument('-p', '--pipe', default='$PIPE',
-                        help='pipe name (for output command line)')
+    parser.add_argument('-p', '--pipe', default=None,
+                        help=('pipe name (for output command line, '
+                              'default is a guess or "$PIPE")'))
     parser.add_argument('-t', '--type', default=None, choices=TYPES,
                         help='restrict to this type')
     parser.add_argument('-o', '--opnum', default=None, type=int,
@@ -91,6 +92,13 @@ def main():
         sys.exit(1)
 
     for fn in args.FILES:
+        if pipe is None:
+            m = re.search(r'clusterfuzz-testcase.+-fuzz_ndr_([a-z]+)', fn)
+            if m is None:
+                pipe = '$PIPE'
+            else:
+                pipe = m.group(1)
+
         if args.crash_filter is not None:
             if not re.search(args.crash_filter, fn):
                 print_if_verbose(f"skipping {fn}")