4 signal
.signal(signal
.SIGINT
, signal
.SIG_DFL
)
9 import twisted
.internet
10 import twisted
.internet
.endpoints
11 from twisted
.web
.server
import NOT_DONE_YET
12 from twisted
.logger
import LogLevel
14 #import twisted.web.server import Site
15 #from twisted.web.resource import Resource
17 from optparse
import OptionParser
18 from configparser
import ConfigParser
19 from configparser
import NoOptionError
25 from hippotat
import *
31 max_batch_down = 65536
34 target_requests_outstanding = 3
43 ipif = userv root ipif %(host)s,%(relay)s,%(mtu)s,slip %(network)s
48 max_batch_down = 262144
50 max_request_time = 121
51 target_requests_outstanding = 10
54 #---------- error handling ----------
57 print('CRASH ', err
, file=sys
.stderr
)
59 except twisted
.internet
.error
.ReactorNotRunning
: pass
61 def crash_on_defer(defer
):
62 defer
.addErrback(lambda err
: crash(err
))
64 def crash_on_critical(event
):
65 if event
.get('log_level') >= LogLevel
.critical
:
66 crash(twisted
.logger
.formatEvent(event
))
68 #---------- "router" ----------
70 def route(packet
, saddr
, daddr
):
71 print('TRACE ', saddr
, daddr
, packet
)
72 try: client
= clients
[daddr
]
73 except KeyError: dclient
= None
74 if dclient
is not None:
75 dclient
.queue_outbound(packet
)
76 elif saddr
.is_link_local
or daddr
.is_link_local
:
77 log_discard(packet
, saddr
, daddr
, 'link-local')
78 elif daddr
== host
or daddr
not in network
:
79 print('TRACE INBOUND ', saddr
, daddr
, packet
)
82 log_discard(packet
, saddr
, daddr
, 'relay')
84 log_discard(packet
, saddr
, daddr
, 'no client')
86 def log_discard(packet
, saddr
, daddr
, why
):
87 print('DROP ', saddr
, daddr
, why
)
88 # syslog.syslog(syslog.LOG_DEBUG,
89 # 'discarded packet %s -> %s (%s)' % (saddr, daddr, why))
91 #---------- client ----------
94 def __init__(self
, ip
, cs
):
95 # instance data members
98 self
.pw
= cfg
.get(cs
, 'password')
99 self
._rq
= collections
.deque() # requests
100 # self._pq = PacketQueue(...)
105 # .target_requests_outstanding
106 for k
in ('max_batch_down','max_queue_time','max_request_time',
107 'target_requests_outstanding'):
108 req
= cfg
.getint(cs
, k
)
109 limit
= cfg
.getint('limits',k
)
110 self
.__dict__
[k
] = min(req
, limit
)
111 self
._pq
= PacketQueue(self
.max_queue_time
)
113 def process_arriving_data(self
, d
):
114 for packet
in slip
.decode(d
):
115 (saddr
, daddr
) = packet_addrs(packet
)
116 if saddr
!= self
._ip
:
117 raise ValueError('wrong source address %s' % saddr
)
118 route(packet
, saddr
, daddr
)
120 def _req_cancel(self
, request
):
123 def _req_error(self
, err
, request
):
124 self
._req_cancel(request
)
126 def queue_outbound(self
, packet
):
127 self
._pq
.append(packet
)
129 def http_request(self
, request
):
130 request
.setHeader('Content-Type','application/octet-stream')
131 reactor
.callLater(self
.max_request_time
, self
._req_cancel
, request
)
132 request
.notifyFinish().addErrback(self
._req_error
, request
)
133 self
._rq
.append(request
)
134 self
._check_outbound()
136 def _check_outbound(self
):
138 try: request
= self
._rq
[0]
139 except IndexError: request
= None
140 if request
and request
.finished
:
144 if not self
._pq
.nonempty():
145 # no packets, oh well
152 # request, and also some non-expired packets
154 packet
= self
.pq
.popleft()
155 if packet
is None: break
157 encoded
= slip
.encode(packet
)
159 if request
.sentLength
> 0:
160 if (request
.sentLength
+ len(slip
.delimiter
)
161 + len(encoded
) > self
.max_batch_down
):
163 request
.write(slip
.delimiter
)
165 request
.write(encoded
)
168 assert(request
.sentLength
)
171 # round again, looking for more to do
173 while len(self
._rq
) > self
.target_requests_outstanding
:
174 request
= self
._rq
.popleft()
177 class IphttpResource(twisted
.web
.resource
.Resource
):
179 def render_POST(self
, request
):
180 # find client, update config, etc.
181 ci
= ipaddr(request
.args
['i'])
183 pw
= request
.args
['pw']
184 if pw
!= c
.pw
: raise ValueError('bad password')
187 for r
, w
in (('mbd', 'max_batch_down'),
188 ('mqt', 'max_queue_time'),
189 ('mrt', 'max_request_time'),
190 ('tro', 'target_requests_outstanding')):
191 try: v
= request
.args
[r
]
192 except KeyError: continue
196 try: d
= request
.args
['d']
197 except KeyError: d
= ''
199 c
.process_arriving_data(d
)
200 c
.new_request(request
)
202 def render_GET(self
, request
):
203 return b
'<html><body>hippotat</body></html>'
206 resource
= IphttpResource()
207 site
= twisted
.web
.server
.Site(resource
)
208 for addrspec
in cfg
.get('server','addrs').split():
210 addr
= ipaddress
.IPv4Address(addrspec
)
211 endpointfactory
= twisted
.internet
.endpoints
.TCP4ServerEndpoint
212 except AddressValueError
:
213 addr
= ipaddress
.IPv6Address(addrspec
)
214 endpointfactory
= twisted
.internet
.endpoints
.TCP6ServerEndpoint
215 ep
= endpointfactory(reactor
, cfg
.getint('server','port'), addr
)
216 crash_on_defer(ep
.listen(site
))
218 #---------- config and setup ----------
226 network
= ipnetwork(cfg
.get('virtual','network'))
227 if network
.num_addresses
< 3 + 2:
228 raise ValueError('network needs at least 2^3 addresses')
231 host
= cfg
.get('virtual','host')
232 except NoOptionError
:
233 host
= next(network
.hosts())
236 relay
= cfg
.get('virtual','relay')
237 except NoOptionError
:
238 for search
in network
.hosts():
239 if search
== host
: continue
243 for cs
in cfg
.sections():
244 if not (':' in cs
or '.' in cs
): continue
246 if ci
not in network
:
247 raise ValueError('client %s not in network' % ci
)
249 raise ValueError('multiple client cfg sections for %s' % ci
)
250 clients
[ci
] = Client(ci
, cs
)
253 mtu
= cfg
.get('virtual','mtu')
256 for k
in ('host','relay','mtu','network'):
257 iic_vars
[k
] = globals()[k
]
259 ipif_command
= cfg
.get('server','ipif', vars=iic_vars
)
265 op
.add_option('-c', '--config', dest
='configfile',
266 default
='/etc/hippottd/server.conf')
268 (opts
, args
) = op
.parse_args()
269 if len(args
): op
.error('no non-option arguments please')
271 twisted
.logger
.globalLogPublisher
.addObserver(crash_on_critical
)
274 cfg
.read_string(defcfg
)
275 cfg
.read(opts
.configfile
)
278 start_ipif(ipif_command
, route
)
283 print('CRASHED (end)', file=sys
.stderr
)