| 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 | def lt(dest): |
| 21 | log_data(DBG.ROUTE, packet, 'route: %s -> %s: %s' % (saddr,daddr,dest)) |
| 22 | try: dclient = clients[daddr] |
| 23 | except KeyError: dclient = None |
| 24 | if dclient is not None: |
| 25 | lt('client') |
| 26 | dclient.queue_outbound(packet) |
| 27 | elif daddr == c.server or daddr not in c.network: |
| 28 | lt('inbound') |
| 29 | queue_inbound(packet) |
| 30 | elif daddr == relay: |
| 31 | lt('discard relay') |
| 32 | log_discard(packet, saddr, daddr, 'relay') |
| 33 | else: |
| 34 | lt('discard no-client') |
| 35 | log_discard(packet, saddr, daddr, 'no-client') |
| 36 | |
| 37 | #---------- client ---------- |
| 38 | |
| 39 | class Client(): |
| 40 | def __init__(self, ip, cs, pw): |
| 41 | # instance data members |
| 42 | self._ip = ip |
| 43 | self._cs = cs |
| 44 | self.pw = pw |
| 45 | self._rq = collections.deque() # requests |
| 46 | # self._pq = PacketQueue(...) |
| 47 | # plus from config: |
| 48 | # .max_batch_down |
| 49 | # .max_queue_time |
| 50 | # .max_request_time |
| 51 | # .target_requests_outstanding |
| 52 | |
| 53 | if ip not in c.network: |
| 54 | raise ValueError('client %s not in network' % ip) |
| 55 | |
| 56 | for k in ('max_batch_down','max_queue_time','max_request_time', |
| 57 | 'target_requests_outstanding'): |
| 58 | req = cfg.getint(cs, k) |
| 59 | limit = cfg.getint('limits',k) |
| 60 | self.__dict__[k] = min(req, limit) |
| 61 | |
| 62 | self._pq = PacketQueue(self.max_queue_time) |
| 63 | |
| 64 | if ip in clients: |
| 65 | raise ValueError('multiple client cfg sections for %s' % ip) |
| 66 | clients[ip] = self |
| 67 | |
| 68 | log_debug('DBG.INIT', 'new client %s' % self) |
| 69 | |
| 70 | def process_arriving_data(self, d): |
| 71 | log_data(DBG.FLOW, d, 'client req data: %s' % saddr=self._ip) |
| 72 | for packet in slip.decode(d): |
| 73 | (saddr, daddr) = packet_addrs(packet) |
| 74 | if saddr != self._ip: |
| 75 | raise ValueError('wrong source address %s' % saddr) |
| 76 | route(packet, saddr, daddr) |
| 77 | |
| 78 | def _req_cancel(self, request): |
| 79 | log_httpreq(DBG.HTTPCTRL, request, 'cancel') |
| 80 | request.finish() |
| 81 | |
| 82 | def _req_error(self, err, request): |
| 83 | log_httpreq(DBG.HTTPCTRL, request, 'error %s' % err) |
| 84 | self._req_cancel(request) |
| 85 | |
| 86 | def queue_outbound(self, packet): |
| 87 | self._pq.append(packet) |
| 88 | self._check_outbound() |
| 89 | |
| 90 | def new_request(self, request): |
| 91 | request.setHeader('Content-Type','application/octet-stream') |
| 92 | reactor.callLater(self.max_request_time, self._req_cancel, request) |
| 93 | request.notifyFinish().addErrback(self._req_error, request) |
| 94 | self._rq.append(request) |
| 95 | self._check_outbound() |
| 96 | |
| 97 | def _check_outbound(self): |
| 98 | log_httpreq(DBG.HTTPCTRL, None, 'CHKO') |
| 99 | while True: |
| 100 | try: request = self._rq[0] |
| 101 | except IndexError: request = None |
| 102 | if request and request.finished: |
| 103 | log_httpreq(DBG.HTTP_CTRL, request, 'CHKO request finished, discard') |
| 104 | self._rq.popleft() |
| 105 | continue |
| 106 | |
| 107 | if not self._pq.nonempty(): |
| 108 | # no packets, oh well |
| 109 | log_httpreq(DBG.HTTP_CTRL, request, 'CHKO no packets, OUT-DONE') |
| 110 | break |
| 111 | |
| 112 | if request is None: |
| 113 | # no request |
| 114 | log_httpreq(DBG.HTTP_CTRL, request, 'CHKO no request, OUT-DONE') |
| 115 | break |
| 116 | |
| 117 | log_httpreq(DBG.HTTP_CTRL, request, 'CHKO processing') |
| 118 | # request, and also some non-expired packets |
| 119 | self._pq.process((lambda: request.sentLength), |
| 120 | request.write, |
| 121 | self.max_batch_down) |
| 122 | |
| 123 | assert(request.sentLength) |
| 124 | self._rq.popleft() |
| 125 | request.finish() |
| 126 | log_httpreq(DBG.HTTP, request, 'complete') |
| 127 | # round again, looking for more to do |
| 128 | |
| 129 | while len(self._rq) > self.target_requests_outstanding: |
| 130 | request = self._rq.popleft() |
| 131 | log_httpreq(DBG.HTTP, request, 'CHKO above target, returning empty') |
| 132 | request.finish() |
| 133 | |
| 134 | def process_request(request, desca): |
| 135 | # find client, update config, etc. |
| 136 | metadata = request.args['m'] |
| 137 | metadata = metadata.split(b'\n') |
| 138 | (ci_s, pw, tro) = metadata.split(b'\n')[0:3] |
| 139 | desca['m'] = [ci_s, tro] |
| 140 | ci = ipaddr(ci_s) |
| 141 | desca['ci'] = ci |
| 142 | cl = clients[ci] |
| 143 | if pw != cl.pw: raise ValueError('bad password') |
| 144 | desca['pwok'=True] |
| 145 | |
| 146 | if tro != cl.target_requests_outstanding: |
| 147 | raise ValueError('tro must be %d' % cl.target_requests_outstanding) |
| 148 | |
| 149 | try: |
| 150 | d = request.args['d'] |
| 151 | desca['d'] = d |
| 152 | except KeyError: d = '' |
| 153 | |
| 154 | cl.process_arriving_data(d) |
| 155 | cl.new_request(request) |
| 156 | |
| 157 | class IphttpResource(twisted.web.resource.Resource): |
| 158 | isLeaf = True |
| 159 | def render_POST(self, request): |
| 160 | desca = {'d': None} |
| 161 | try: process_request(request, desca) |
| 162 | except Exception as e: |
| 163 | emsg = str(e).encode('utf-8') |
| 164 | log_http(desca, 'EXCEPTION ' + emsg) |
| 165 | request.setHeader('Content-Type','text/plain; charset="utf-8"') |
| 166 | request.setResponseCode(400) |
| 167 | return emsg |
| 168 | log_http(desca, '... [%s]' % id(request)) |
| 169 | return NOT_DONE_YET |
| 170 | |
| 171 | def render_GET(self, request): |
| 172 | log_debug(DBG.HTTP, 'GET request') |
| 173 | return b'<html><body>hippotat</body></html>' |
| 174 | |
| 175 | def start_http(): |
| 176 | resource = IphttpResource() |
| 177 | site = twisted.web.server.Site(resource) |
| 178 | for sa in c.saddrs: |
| 179 | ep = sa.make_endpoint() |
| 180 | crash_on_defer(ep.listen(site)) |
| 181 | log_debug(DBG.INIT, 'listening on %s' % sa) |
| 182 | |
| 183 | #---------- config and setup ---------- |
| 184 | |
| 185 | def process_cfg(): |
| 186 | process_cfg_common_always() |
| 187 | process_cfg_server() |
| 188 | process_cfg_network() |
| 189 | |
| 190 | try: |
| 191 | c.relay = cfg.get('virtual','relay') |
| 192 | except NoOptionError: |
| 193 | for search in c.network.hosts(): |
| 194 | if search == c.server: continue |
| 195 | c.relay = search |
| 196 | break |
| 197 | |
| 198 | process_cfg_saddrs() |
| 199 | process_cfg_clients(Client) |
| 200 | |
| 201 | process_cfg_ipif('server', |
| 202 | (('local','server'), |
| 203 | ('peer', 'relay'), |
| 204 | ('rnets','network'))) |
| 205 | |
| 206 | common_startup() |
| 207 | process_cfg() |
| 208 | start_ipif(c.ipif_command, route) |
| 209 | start_http() |
| 210 | common_run() |