X-Git-Url: https://git.distorted.org.uk/~mdw/tripe/blobdiff_plain/fd42a1e558d856a1933385d7ed60e5fbe490f413..b7e1e18b57c30555f65a2548e0f1f186200c0ea8:/keys/tripe-keys.in

diff --git a/keys/tripe-keys.in b/keys/tripe-keys.in
index 1e56282b..b0dbf945 100644
--- a/keys/tripe-keys.in
+++ b/keys/tripe-keys.in
@@ -30,7 +30,7 @@
 import catacomb as C
 import os as OS
 import sys as SYS
-import sre as RX
+import re as RX
 import getopt as O
 import shutil as SH
 import filecmp as FC
@@ -143,6 +143,7 @@ def run(args):
       nargs += a[1:].split()
   args = nargs
   print '+ %s' % ' '.join(args)
+  SYS.stdout.flush()
   rc = OS.spawnvp(OS.P_WAIT, args[0], args)
   if rc != 0:
     raise SubprocessError, rc
@@ -473,6 +474,30 @@ def cmd_clean(args):
       zap(i)
 
 ###--------------------------------------------------------------------------
+### Commands: mtu
+
+def cmd_mtu(args):
+  mtu, = (lambda mtu = '1500': (mtu,))(*args)
+  mtu = int(mtu)
+
+  blksz = C.gcciphers[conf['cipher']].blksz
+
+  index = conf['mac'].find('/')
+  if index == -1:
+    tagsz = C.gcmacs[conf['mac']].tagsz
+  else:
+    tagsz = int(conf['mac'][index + 1:])/8
+
+  mtu -= 20                             # Minimum IP header
+  mtu -= 8                              # UDP header
+  mtu -= 1                              # TrIPE packet type octet
+  mtu -= tagsz                          # MAC tag
+  mtu -= 4                              # Sequence number
+  mtu -= blksz                          # Initialization vector
+
+  print mtu
+
+###--------------------------------------------------------------------------
 ### Main driver.
 
 ## Exceptions.
@@ -484,6 +509,7 @@ commands = {'help': (cmd_help, 0, 1, ''),
             'upload': (cmd_upload, 0, 0, ''),
             'update': (cmd_update, 0, 0, ''),
             'clean': (cmd_clean, 0, 0, ''),
+            'mtu': (cmd_mtu, 0, 1, '[PATH-MTU]'),
             'generate': (cmd_generate, 1, 1, 'TAG'),
             'rebuild': (cmd_rebuild, 0, 0, '')}