new option to disable fullness checking

On high latency links, the PING/PONG round trip triggered by fullness
checking could kill the bandwidth. Disabling it could result in >10x
bandwidth increase in some setups where the existing latency is already high
and the available bandwidth is also high.

assembler.py

@@ -21,6 +21,7 @@ while 1:
         break
 
 verbose = verbosity
+no_fullness = no_fullness0
 sys.stderr.flush()
 sys.stdout.flush()
 main()

main.py

 #!/usr/bin/env python
 import sys, os, re
-import helpers, options, client, server, firewall, hostwatch
+import helpers, options, client, server, firewall, hostwatch, ssnet
 import compat.ssubprocess as ssubprocess
 from helpers import *
 
@@ -51,6 +51,7 @@ sshuttle --server
 sshuttle --firewall <port> <subnets...>
 sshuttle --hostwatch
 --
+f,disable-fullness turn off fullness checking (could 10x bandwidth on high latency link)
 l,listen=  transproxy to this ip address and port number [127.0.0.1:0]
 H,auto-hosts scan for remote hostnames and update local /etc/hosts
 N,auto-nets  automatically determine subnets to route
@@ -73,7 +74,7 @@ o = options.Options('sshuttle', optspec)
 if opt.daemon:
     opt.syslog = 1
 helpers.verbose = opt.verbose
-
+ssnet.no_fullness = opt.disable_fullness
 try:
     if opt.server:
         if len(extra) != 0:

ssh.py

 import sys, os, re, socket, zlib
 import compat.ssubprocess as ssubprocess
-import helpers
+import helpers, ssnet
 from helpers import *
 
 
@@ -63,8 +63,9 @@ def connect(ssh_cmd, rhostport, python, stderr):
                 import sys;
                 skip_imports=1;
                 verbosity=%d;
+                no_fullness0=%d;
                 exec compile(sys.stdin.read(%d), "assembler.py", "exec")
-                """ % (helpers.verbose or 0, len(content))
+                """ % (helpers.verbose or 0, ssnet.no_fullness or 0, len(content))
     pyscript = re.sub(r'\s+', ' ', pyscript.strip())
 
         

ssnet.py

@@ -35,7 +35,7 @@ cmd_to_name = {
     CMD_HOST_LIST: 'HOST_LIST',
 }
     
-
+no_fullness = 0
 
 def _add(l, elem):
     if not elem in l:
@@ -308,7 +308,7 @@ class Mux(Handler):
         return total
             
     def check_fullness(self):
-        if self.fullness > 32768:
+        if not no_fullness and self.fullness > 32768:
             if not self.too_full:
                 self.send(0, CMD_PING, 'rttest')
             self.too_full = True
@@ -326,6 +326,7 @@ class Mux(Handler):
         debug2(' > channel=%d cmd=%s len=%d (fullness=%d)\n'
                % (channel, cmd_to_name.get(cmd,hex(cmd)),
                   len(data), self.fullness))
+        if not no_fullness:
             self.fullness += len(data)
 
     def got_packet(self, channel, cmd, data):