From ec88b1f1080f9adffbe1c4c05c38c01e758f124b Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 19 Mar 2017 12:48:06 +0000
Subject: [PATCH] wip

---
 PROTOCOL | 28 +++++++++++++++-----
 server   | 79 +++++++++++++++++++++++++++++++++++++++++++++-----------
 2 files changed, 85 insertions(+), 22 deletions(-)

diff --git a/PROTOCOL b/PROTOCOL
index 9969e61..330c01f 100644
--- a/PROTOCOL
+++ b/PROTOCOL
@@ -11,12 +11,23 @@ It's a multipart/form-data.
 Authentication: for now, plaintext password
 
 Sever side configuration:
- Per user but normally global
-  MAX_MAX_BATCH_DOWN MAX_MAX_QUEUE_TIME
- Global
-  MTU
- Per user
-  PASSWORD
+
+ [<client-ipaddr>] or [default]
+ max_batch_down
+ max_queue_time
+ max_request_time
+ password
+
+ [global]
+ max_batch_down
+ max_queue_time
+ max_request_time
+
+ [virtual]
+ network	    # required
+ server		    # default is first host in network (eg <network>.1)
+ mtu                # default is 1500
+ 
 
 Client side configuration;
  MAX_BATCH_DOWN MAX_QUEUE_TIME PASSWORD
@@ -24,4 +35,7 @@ Client side configuration;
 Routing assistance: none needed; secnet polypath will DTRT
 
 Client form parameters:
- I MBD MQT P D
+ i		ip address (textual)
+ p		password
+ d              data (SLIP format)
+ mbd mqt mrt	config updates
diff --git a/server b/server
index fcf7a81..1a9049b 100755
--- a/server
+++ b/server
@@ -6,43 +6,92 @@ from twisted.web.server import NOT_DONE_YET
 from twisted.internet import reactor
 
 import ConfigParser
-
-import cgi
+import ipaddress
 
 clients = { }
 
 def ipaddress(input):
   try:
-    r = IPv4Address(input)
+    r = ipaddress.IPv4Address(input)
   except AddressValueError:
-    r = IPv6Address(input)
+    r = ipaddress.IPv6Address(input)
   return r
 
 def ipnetwork(input):
   try:
-    r = IPv4Network(input)
+    r = ipaddress.IPv4Network(input)
   except NetworkValueError:
-    r = IPv6Network(input)
+    r = ipaddress.IPv6Network(input)
   return r
 
+defcfg = u'''
+[default]
+max_batch_down: 65536
+max_queue_time: 10
+max_request_time: 54
+
+[global]
+max_batch_down: 262144
+max_queue_time: 121
+max_request_time: 121
+'''
+
+class Client():
+  def __init__(ip, cs):
+    # instance data members
+    self._ip = ip
+    self._cs = cs
+    self.pw = cfg.get(cs, 'password')
+    # plus:
+    #  .cfg[<config-key>]
+    self.cfg = { }
+    for k in ('max_batch_down','max_queue_time','max_request_time'):
+      req = cfg.getint(cs, k)
+      limit = cfg.getint('global',k)
+      self.cfg[k] = min(req, limit)
+
+    def process_arriving_data(d):
+      
+
 def process_cfg():
   global network
   global ourself
 
-  network = ipnetwork(cfg.get('virtual','network')
+  network = ipnetwork(cfg.get('virtual','network'))
   try:
     ourself = cfg.get('virtual','server')
   except ConfigParser.NoOptionError:
     ourself = network.hosts().next()
 
-  
-
-class Client():
-  def __init__(ip):
-  # instance data members
-  #  ._ip
-    self._ip = IPv4Address(ip)
-    clients 
+  for cs in cfg.sections():
+    if not (':' in cs or '.' in cs): continue
+    ci = ipaddress(cs)
+    if ci not in network:
+      raise ValueError('client %s not in network' % ci)
+    if ci in clients:
+      raise ValueError('multiple client cfg sections for %s' % ci)
+    clients[ci] = Client(ci, cs)
 
 class FormPage(Resource):
   def render_POST(self, request):
+    # find client, update config, etc.
+    ci = ipaddress(request.args['i'])
+    c = clients[ci]
+    pw = request.args['pw']
+    if pw != c.pw: raise ValueError('bad password')
+
+    # update config
+    for r, w in (('mbd', 'max_batch_down'),
+                 ('mqt', 'max_queue_time'),
+                 ('mrt', 'max_request_time')):
+      try: v = request.args[r]
+      except KeyError: continue
+      v = int(v)
+      c.cfg[w] = v
+
+    try: d = request.args['d']
+    except KeyError: d = ''
+
+    c.process_arriving_data(d)
+
+    reactor.
-- 
2.30.2