| 1 | #!/usr/bin/python3 |
| 2 | |
| 3 | from hippotat import * |
| 4 | |
| 5 | import os |
| 6 | |
| 7 | import twisted.internet |
| 8 | from twisted.web.server import NOT_DONE_YET |
| 9 | |
| 10 | #import twisted.web.server import Site |
| 11 | #from twisted.web.resource import Resource |
| 12 | |
| 13 | import syslog |
| 14 | |
| 15 | clients = { } |
| 16 | |
| 17 | #---------- "router" ---------- |
| 18 | |
| 19 | def route(packet, saddr, daddr): |
| 20 | print('TRACE ', saddr, daddr, packet) |
| 21 | try: dclient = clients[daddr] |
| 22 | except KeyError: dclient = None |
| 23 | if dclient is not None: |
| 24 | dclient.queue_outbound(packet) |
| 25 | elif daddr == c.server or daddr not in c.network: |
| 26 | print('TRACE INBOUND ', saddr, daddr, packet) |
| 27 | queue_inbound(packet) |
| 28 | elif daddr == relay: |
| 29 | log_discard(packet, saddr, daddr, 'relay') |
| 30 | else: |
| 31 | log_discard(packet, saddr, daddr, 'no client') |
| 32 | |
| 33 | #---------- client ---------- |
| 34 | |
| 35 | class Client(): |
| 36 | def __init__(self, ip, cs, pw): |
| 37 | # instance data members |
| 38 | self._ip = ip |
| 39 | self._cs = cs |
| 40 | self.pw = pw |
| 41 | self._rq = collections.deque() # requests |
| 42 | # self._pq = PacketQueue(...) |
| 43 | # plus from config: |
| 44 | # .max_batch_down |
| 45 | # .max_queue_time |
| 46 | # .max_request_time |
| 47 | # .target_requests_outstanding |
| 48 | |
| 49 | if ip not in c.network: |
| 50 | raise ValueError('client %s not in network' % ip) |
| 51 | |
| 52 | for k in ('max_batch_down','max_queue_time','max_request_time', |
| 53 | 'target_requests_outstanding'): |
| 54 | req = cfg.getint(cs, k) |
| 55 | limit = cfg.getint('limits',k) |
| 56 | self.__dict__[k] = min(req, limit) |
| 57 | |
| 58 | self._pq = PacketQueue(self.max_queue_time) |
| 59 | |
| 60 | if ip in clients: |
| 61 | raise ValueError('multiple client cfg sections for %s' % ip) |
| 62 | clients[ip] = self |
| 63 | |
| 64 | def process_arriving_data(self, d): |
| 65 | for packet in slip.decode(d): |
| 66 | (saddr, daddr) = packet_addrs(packet) |
| 67 | if saddr != self._ip: |
| 68 | raise ValueError('wrong source address %s' % saddr) |
| 69 | route(packet, saddr, daddr) |
| 70 | |
| 71 | def _req_cancel(self, request): |
| 72 | request.finish() |
| 73 | |
| 74 | def _req_error(self, err, request): |
| 75 | self._req_cancel(request) |
| 76 | |
| 77 | def queue_outbound(self, packet): |
| 78 | self._pq.append(packet) |
| 79 | self._check_outbound() |
| 80 | |
| 81 | def http_request(self, request): |
| 82 | request.setHeader('Content-Type','application/octet-stream') |
| 83 | reactor.callLater(self.max_request_time, self._req_cancel, request) |
| 84 | request.notifyFinish().addErrback(self._req_error, request) |
| 85 | self._rq.append(request) |
| 86 | self._check_outbound() |
| 87 | |
| 88 | def _check_outbound(self): |
| 89 | while True: |
| 90 | try: request = self._rq[0] |
| 91 | except IndexError: request = None |
| 92 | if request and request.finished: |
| 93 | self._rq.popleft() |
| 94 | continue |
| 95 | |
| 96 | if not self._pq.nonempty(): |
| 97 | # no packets, oh well |
| 98 | continue |
| 99 | |
| 100 | if request is None: |
| 101 | # no request |
| 102 | break |
| 103 | |
| 104 | # request, and also some non-expired packets |
| 105 | self._pq.process((lambda: request.sentLength), |
| 106 | request.write, |
| 107 | self.max_batch_down) |
| 108 | |
| 109 | assert(request.sentLength) |
| 110 | self._rq.popleft() |
| 111 | request.finish() |
| 112 | # round again, looking for more to do |
| 113 | |
| 114 | while len(self._rq) > self.target_requests_outstanding: |
| 115 | request = self._rq.popleft() |
| 116 | request.finish() |
| 117 | |
| 118 | def process_request(request): |
| 119 | # find client, update config, etc. |
| 120 | metadata = request.args['m'] |
| 121 | (ci_s, pw, tro) = metadata.split(b'\n')[0:3] |
| 122 | ci = ipaddr(ci_s) |
| 123 | cl = clients[ci] |
| 124 | if pw != cl.pw: raise ValueError('bad password') |
| 125 | |
| 126 | if pw != cl.target_requests_outstanding: |
| 127 | raise ... |
| 128 | |
| 129 | try: d = request.args['d'] |
| 130 | except KeyError: d = '' |
| 131 | |
| 132 | cl.process_arriving_data(d) |
| 133 | cl.new_request(request) |
| 134 | |
| 135 | class IphttpResource(twisted.web.resource.Resource): |
| 136 | isLeaf = True |
| 137 | def render_POST(self, request): |
| 138 | try: process_request(request) |
| 139 | except Exception as e: |
| 140 | request.setHeader('Content-Type','text/plain; charset="utf-8"') |
| 141 | request.setResponseCode(400) |
| 142 | request.write(str(e).encode('utf-8')) |
| 143 | request.finish |
| 144 | |
| 145 | def render_GET(self, request): |
| 146 | return b'<html><body>hippotat</body></html>' |
| 147 | |
| 148 | def start_http(): |
| 149 | resource = IphttpResource() |
| 150 | site = twisted.web.server.Site(resource) |
| 151 | for sa in c.saddrs: |
| 152 | ep = sa.make_endpoint() |
| 153 | crash_on_defer(ep.listen(site)) |
| 154 | |
| 155 | #---------- config and setup ---------- |
| 156 | |
| 157 | def process_cfg(): |
| 158 | process_cfg_common_always() |
| 159 | process_cfg_server() |
| 160 | process_cfg_network() |
| 161 | |
| 162 | try: |
| 163 | c.relay = cfg.get('virtual','relay') |
| 164 | except NoOptionError: |
| 165 | for search in c.network.hosts(): |
| 166 | if search == c.server: continue |
| 167 | c.relay = search |
| 168 | break |
| 169 | |
| 170 | process_cfg_saddrs() |
| 171 | process_cfg_clients(Client) |
| 172 | |
| 173 | process_cfg_ipif('server', |
| 174 | (('local','server'), |
| 175 | ('peer', 'relay'), |
| 176 | ('rnets','network'))) |
| 177 | |
| 178 | common_startup() |
| 179 | process_cfg() |
| 180 | start_ipif(c.ipif_command, route) |
| 181 | start_http() |
| 182 | common_run() |