8 import twisted
.internet
9 import twisted
.internet
.endpoints
10 from twisted
.web
.server
import NOT_DONE_YET
11 from twisted
.logger
import LogLevel
13 #import twisted.web.server import Site
14 #from twisted.web.resource import Resource
16 from optparse
import OptionParser
17 from configparser
import ConfigParser
18 from configparser
import NoOptionError
28 max_batch_down = 65536
31 target_requests_outstanding = 3
40 ipif = userv root ipif %(host)s,%(relay)s,%(mtu)s,slip %(network)s
45 max_batch_down = 262144
47 max_request_time = 121
48 target_requests_outstanding = 10
51 #---------- error handling ----------
54 print('CRASH ', err
, file=sys
.stderr
)
56 except twisted
.internet
.error
.ReactorNotRunning
: pass
58 def crash_on_defer(defer
):
59 defer
.addErrback(lambda err
: crash(err
))
61 def crash_on_critical(event
):
62 if event
.get('log_level') >= LogLevel
.critical
:
63 crash(twisted
.logger
.formatEvent(event
))
65 #---------- "router" ----------
67 def route(packet
, saddr
, daddr
):
68 print('TRACE ', saddr
, daddr
, packet
)
69 try: client
= clients
[daddr
]
70 except KeyError: dclient
= None
71 if dclient
is not None:
72 dclient
.queue_outbound(packet
)
73 elif saddr
.is_link_local
or daddr
.is_link_local
:
74 log_discard(packet
, saddr
, daddr
, 'link-local')
75 elif daddr
== host
or daddr
not in network
:
76 print('TRACE INBOUND ', saddr
, daddr
, packet
)
79 log_discard(packet
, saddr
, daddr
, 'relay')
81 log_discard(packet
, saddr
, daddr
, 'no client')
83 def log_discard(packet
, saddr
, daddr
, why
):
84 print('DROP ', saddr
, daddr
, why
)
85 # syslog.syslog(syslog.LOG_DEBUG,
86 # 'discarded packet %s -> %s (%s)' % (saddr, daddr, why))
88 #---------- client ----------
91 def __init__(self
, ip
, cs
):
92 # instance data members
95 self
.pw
= cfg
.get(cs
, 'password')
96 self
._rq
= collections
.deque() # requests
97 # self._pq = PacketQueue(...)
102 # .target_requests_outstanding
103 for k
in ('max_batch_down','max_queue_time','max_request_time',
104 'target_requests_outstanding'):
105 req
= cfg
.getint(cs
, k
)
106 limit
= cfg
.getint('limits',k
)
107 self
.__dict__
[k
] = min(req
, limit
)
108 self
._pq
= PacketQueue(self
.max_queue_time
)
110 def process_arriving_data(self
, d
):
111 for packet
in slip
.decode(d
):
112 (saddr
, daddr
) = packet_addrs(packet
)
113 if saddr
!= self
._ip
:
114 raise ValueError('wrong source address %s' % saddr
)
115 route(packet
, saddr
, daddr
)
117 def _req_cancel(self
, request
):
120 def _req_error(self
, err
, request
):
121 self
._req_cancel(request
)
123 def queue_outbound(self
, packet
):
124 self
._pq
.append(packet
)
126 def http_request(self
, request
):
127 request
.setHeader('Content-Type','application/octet-stream')
128 reactor
.callLater(self
.max_request_time
, self
._req_cancel
, request
)
129 request
.notifyFinish().addErrback(self
._req_error
, request
)
130 self
._rq
.append(request
)
131 self
._check_outbound()
133 def _check_outbound(self
):
135 try: request
= self
._rq
[0]
136 except IndexError: request
= None
137 if request
and request
.finished
:
141 if not self
._pq
.nonempty():
142 # no packets, oh well
149 # request, and also some non-expired packets
151 packet
= self
.pq
.popleft()
152 if packet
is None: break
154 encoded
= slip
.encode(packet
)
156 if request
.sentLength
> 0:
157 if (request
.sentLength
+ len(slip
.delimiter
)
158 + len(encoded
) > self
.max_batch_down
):
160 request
.write(slip
.delimiter
)
162 request
.write(encoded
)
165 assert(request
.sentLength
)
168 # round again, looking for more to do
170 while len(self
._rq
) > self
.target_requests_outstanding
:
171 request
= self
._rq
.popleft()
174 class IphttpResource(twisted
.web
.resource
.Resource
):
176 def render_POST(self
, request
):
177 # find client, update config, etc.
178 ci
= ipaddr(request
.args
['i'])
180 pw
= request
.args
['pw']
181 if pw
!= c
.pw
: raise ValueError('bad password')
184 for r
, w
in (('mbd', 'max_batch_down'),
185 ('mqt', 'max_queue_time'),
186 ('mrt', 'max_request_time'),
187 ('tro', 'target_requests_outstanding')):
188 try: v
= request
.args
[r
]
189 except KeyError: continue
193 try: d
= request
.args
['d']
194 except KeyError: d
= ''
196 c
.process_arriving_data(d
)
197 c
.new_request(request
)
199 def render_GET(self
, request
):
200 return b
'<html><body>hippotat</body></html>'
203 resource
= IphttpResource()
204 site
= twisted
.web
.server
.Site(resource
)
205 for addrspec
in cfg
.get('server','addrs').split():
207 addr
= ipaddress
.IPv4Address(addrspec
)
208 endpointfactory
= twisted
.internet
.endpoints
.TCP4ServerEndpoint
209 except AddressValueError
:
210 addr
= ipaddress
.IPv6Address(addrspec
)
211 endpointfactory
= twisted
.internet
.endpoints
.TCP6ServerEndpoint
212 ep
= endpointfactory(reactor
, cfg
.getint('server','port'), addr
)
213 crash_on_defer(ep
.listen(site
))
215 #---------- config and setup ----------
223 network
= ipnetwork(cfg
.get('virtual','network'))
224 if network
.num_addresses
< 3 + 2:
225 raise ValueError('network needs at least 2^3 addresses')
228 host
= cfg
.get('virtual','host')
229 except NoOptionError
:
230 host
= next(network
.hosts())
233 relay
= cfg
.get('virtual','relay')
234 except NoOptionError
:
235 for search
in network
.hosts():
236 if search
== host
: continue
240 for cs
in cfg
.sections():
241 if not (':' in cs
or '.' in cs
): continue
243 if ci
not in network
:
244 raise ValueError('client %s not in network' % ci
)
246 raise ValueError('multiple client cfg sections for %s' % ci
)
247 clients
[ci
] = Client(ci
, cs
)
250 mtu
= cfg
.get('virtual','mtu')
253 for k
in ('host','relay','mtu','network'):
254 iic_vars
[k
] = globals()[k
]
256 ipif_command
= cfg
.get('server','ipif', vars=iic_vars
)
262 op
.add_option('-c', '--config', dest
='configfile',
263 default
='/etc/hippottd/server.conf')
265 (opts
, args
) = op
.parse_args()
266 if len(args
): op
.error('no non-option arguments please')
268 twisted
.logger
.globalLogPublisher
.addObserver(crash_on_critical
)
271 cfg
.read_string(defcfg
)
272 cfg
.read(opts
.configfile
)
275 start_ipif(ipif_command
, route
)
280 print('CRASHED (end)', file=sys
.stderr
)