8 import twisted
.internet
9 import twisted
.internet
.endpoints
10 from twisted
.web
.server
import NOT_DONE_YET
12 #import twisted.web.server import Site
13 #from twisted.web.resource import Resource
21 max_batch_down = 65536
24 target_requests_outstanding = 3
33 ipif = userv root ipif %(host)s,%(relay)s,%(mtu)s,slip %(network)s
38 max_batch_down = 262144
40 max_request_time = 121
41 target_requests_outstanding = 10
44 #---------- "router" ----------
46 def route(packet
, saddr
, daddr
):
47 print('TRACE ', saddr
, daddr
, packet
)
48 try: client
= clients
[daddr
]
49 except KeyError: dclient
= None
50 if dclient
is not None:
51 dclient
.queue_outbound(packet
)
52 elif saddr
.is_link_local
or daddr
.is_link_local
:
53 log_discard(packet
, saddr
, daddr
, 'link-local')
54 elif daddr
== host
or daddr
not in network
:
55 print('TRACE INBOUND ', saddr
, daddr
, packet
)
58 log_discard(packet
, saddr
, daddr
, 'relay')
60 log_discard(packet
, saddr
, daddr
, 'no client')
62 def log_discard(packet
, saddr
, daddr
, why
):
63 print('DROP ', saddr
, daddr
, why
)
64 # syslog.syslog(syslog.LOG_DEBUG,
65 # 'discarded packet %s -> %s (%s)' % (saddr, daddr, why))
67 #---------- client ----------
70 def __init__(self
, ip
, cs
):
71 # instance data members
74 self
.pw
= cfg
.get(cs
, 'password')
75 self
._rq
= collections
.deque() # requests
76 # self._pq = PacketQueue(...)
81 # .target_requests_outstanding
82 for k
in ('max_batch_down','max_queue_time','max_request_time',
83 'target_requests_outstanding'):
84 req
= cfg
.getint(cs
, k
)
85 limit
= cfg
.getint('limits',k
)
86 self
.__dict__
[k
] = min(req
, limit
)
87 self
._pq
= PacketQueue(self
.max_queue_time
)
89 def process_arriving_data(self
, d
):
90 for packet
in slip
.decode(d
):
91 (saddr
, daddr
) = packet_addrs(packet
)
93 raise ValueError('wrong source address %s' % saddr
)
94 route(packet
, saddr
, daddr
)
96 def _req_cancel(self
, request
):
99 def _req_error(self
, err
, request
):
100 self
._req_cancel(request
)
102 def queue_outbound(self
, packet
):
103 self
._pq
.append(packet
)
105 def http_request(self
, request
):
106 request
.setHeader('Content-Type','application/octet-stream')
107 reactor
.callLater(self
.max_request_time
, self
._req_cancel
, request
)
108 request
.notifyFinish().addErrback(self
._req_error
, request
)
109 self
._rq
.append(request
)
110 self
._check_outbound()
112 def _check_outbound(self
):
114 try: request
= self
._rq
[0]
115 except IndexError: request
= None
116 if request
and request
.finished
:
120 if not self
._pq
.nonempty():
121 # no packets, oh well
128 # request, and also some non-expired packets
130 packet
= self
.pq
.popleft()
131 if packet
is None: break
133 encoded
= slip
.encode(packet
)
135 if request
.sentLength
> 0:
136 if (request
.sentLength
+ len(slip
.delimiter
)
137 + len(encoded
) > self
.max_batch_down
):
139 request
.write(slip
.delimiter
)
141 request
.write(encoded
)
144 assert(request
.sentLength
)
147 # round again, looking for more to do
149 while len(self
._rq
) > self
.target_requests_outstanding
:
150 request
= self
._rq
.popleft()
153 class IphttpResource(twisted
.web
.resource
.Resource
):
155 def render_POST(self
, request
):
156 # find client, update config, etc.
157 ci
= ipaddr(request
.args
['i'])
159 pw
= request
.args
['pw']
160 if pw
!= c
.pw
: raise ValueError('bad password')
163 for r
, w
in (('mbd', 'max_batch_down'),
164 ('mqt', 'max_queue_time'),
165 ('mrt', 'max_request_time'),
166 ('tro', 'target_requests_outstanding')):
167 try: v
= request
.args
[r
]
168 except KeyError: continue
172 try: d
= request
.args
['d']
173 except KeyError: d
= ''
175 c
.process_arriving_data(d
)
176 c
.new_request(request
)
178 def render_GET(self
, request
):
179 return b
'<html><body>hippotat</body></html>'
182 resource
= IphttpResource()
183 site
= twisted
.web
.server
.Site(resource
)
184 for addrspec
in cfg
.get('server','addrs').split():
186 addr
= ipaddress
.IPv4Address(addrspec
)
187 endpointfactory
= twisted
.internet
.endpoints
.TCP4ServerEndpoint
188 except AddressValueError
:
189 addr
= ipaddress
.IPv6Address(addrspec
)
190 endpointfactory
= twisted
.internet
.endpoints
.TCP6ServerEndpoint
191 ep
= endpointfactory(reactor
, cfg
.getint('server','port'), addr
)
192 crash_on_defer(ep
.listen(site
))
194 #---------- config and setup ----------
202 network
= ipnetwork(cfg
.get('virtual','network'))
203 if network
.num_addresses
< 3 + 2:
204 raise ValueError('network needs at least 2^3 addresses')
207 host
= cfg
.get('virtual','host')
208 except NoOptionError
:
209 host
= next(network
.hosts())
212 relay
= cfg
.get('virtual','relay')
213 except NoOptionError
:
214 for search
in network
.hosts():
215 if search
== host
: continue
219 for cs
in cfg
.sections():
220 if not (':' in cs
or '.' in cs
): continue
222 if ci
not in network
:
223 raise ValueError('client %s not in network' % ci
)
225 raise ValueError('multiple client cfg sections for %s' % ci
)
226 clients
[ci
] = Client(ci
, cs
)
229 mtu
= cfg
.get('virtual','mtu')
232 for k
in ('host','relay','mtu','network'):
233 iic_vars
[k
] = globals()[k
]
235 ipif_command
= cfg
.get('server','ipif', vars=iic_vars
)
238 common_startup(defcfg
)
240 start_ipif(ipif_command
, route
)