Add a "No Reassembly" profile.

Add a script that disables all of our desegmentation and reassembly
preferences and use it to create a "No Reassembly" profile.

Change-Id: Icd0b72e9e271a511e637acde9018f3aae018e589
Reviewed-on: https://code.wireshark.org/review/30799
Reviewed-by: Anders Broman <a.broman58@gmail.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/tools/make-no-reassembly-profile.py b/tools/make-no-reassembly-profile.py
new file mode 100755
index 0000000000..97f3ba98d7
--- /dev/null
+++ b/tools/make-no-reassembly-profile.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Generate preferences for a "No Reassembly" profile.
+# By Gerald Combs <gerald@wireshark.org>
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+'''Generate preferences for a "No Reassembly" profile.'''
+
+import argparse
+import os.path
+import re
+import subprocess
+import sys
+
+def main():
+    if sys.version_info[0] < 3:
+        print("This requires Python 3")
+        sys.exit(2)
+
+    parser = argparse.ArgumentParser(description='No reassembly profile generator')
+    parser.add_argument('-p', '--program-path', default=os.path.curdir, help='Path to TShark.')
+    parser.add_argument('-v', '--verbose', action='store_const', const=True, default=False, help='Verbose output.')
+    args = parser.parse_args()
+
+    this_dir = os.path.dirname(__file__)
+    profile_path = os.path.join(this_dir, '..', 'profiles', 'No Reassembly', 'preferences')
+
+    tshark_path = os.path.join(args.program_path, 'tshark')
+    if not os.path.isfile(tshark_path):
+        print('tshark not found at {}\n'.format(tshark_path))
+        parser.print_usage()
+        sys.exit(1)
+
+    rd_pref_re = re.compile('^#\s*(.*(reassembl|desegment)):')
+    nr_prefs = []
+    prefs_changed = 0
+    cp = subprocess.run([tshark_path, '-G', 'defaultprefs'], stdout=subprocess.PIPE, check=True, encoding='utf-8')
+    for pref_line in cp.stdout.split('\n'):
+        nr_prefs.append(pref_line)
+        m = rd_pref_re.search(pref_line)
+        if m:
+            pref = m.group(1) + ': FALSE'
+            if args.verbose is True:
+                print(pref_line + '\n' + pref)
+            nr_prefs.append(pref)
+            prefs_changed += 1
+
+    if len(nr_prefs) < 5000:
+        print("Too few preference lines.")
+        sys.exit(1)
+
+    if len(nr_prefs) < 50:
+        print("Too few changed preferences.")
+        sys.exit(1)
+
+    with open(profile_path, 'w') as profile_f:
+        for pref_line in nr_prefs:
+            profile_f.write(pref_line + '\n')
+
+if __name__ == '__main__':
+    main()