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{ randomBytes } from 'crypto'\nimport { Errors } from 'ilp-packet'\nimport { create as createLogger } from '../common/log'\nconst log = createLogger('route-broadcaster')\nimport { find } from 'lodash'\nimport RoutingTable from './routing-table'\nimport ForwardingRoutingTable, { RouteUpdate } from './forwarding-routing-table'\nimport Accounts from './accounts'\nimport Config from './config'\nimport Peer from '../routing/peer'\nimport { canDragonFilter } from '../routing/dragon'\nimport { Relation, getRelationPriority } from '../routing/relation'\nimport {\n formatRoutingTableAsJson,\n formatRouteAsJson,\n formatForwardingRoutingTableAsJson\n} from '../routing/utils'\nimport {\n Route,\n IncomingRoute\n} from '../types/routing'\nimport reduct = require('reduct')\nimport { sha256, hmac } from '../lib/utils'\nimport {\n CcpRouteControlRequest,\n CcpRouteUpdateRequest\n} from 'ilp-protocol-ccp'\nconst { BadRequestError } = Errors\n\nexport default class RouteBroadcaster {\n private deps: reduct.Injector\n // Local routing table, used for actually routing packets\n private localRoutingTable: RoutingTable\n // Master routing table, used for routes that we broadcast\n private forwardingRoutingTable: ForwardingRoutingTable\n\n private accounts: Accounts\n private config: Config\n\n private peers: Map<string, Peer>\n private localRoutes: Map<string, Route>\n private routingSecret: Buffer\n private untrackCallbacks: Map<string, () => void> = new Map()\n\n constructor (deps: reduct.Injector) {\n this.deps = deps\n this.localRoutingTable = deps(RoutingTable)\n this.forwardingRoutingTable = deps(ForwardingRoutingTable)\n this.accounts = deps(Accounts)\n this.config = deps(Config)\n\n if (this.config.routingSecret) {\n log.info('loaded routing secret from config.')\n this.routingSecret = Buffer.from(this.config.routingSecret, 'base64')\n } else {\n log.info('generated random routing secret.')\n this.routingSecret = randomBytes(32)\n }\n\n this.peers = new Map() // peerId:string -> peer:Peer\n this.localRoutes = new Map()\n }\n\n start () {\n this.reloadLocalRoutes()\n\n for (const accountId of this.accounts.getAccountIds()) {\n this.track(accountId)\n }\n }\n\n stop () {\n for (const accountId of this.peers.keys()) {\n this.remove(accountId)\n }\n }\n\n track (accountId: string) {\n if (this.untrackCallbacks.has(accountId)) {\n // Already tracked\n return\n }\n\n const plugin = this.accounts.getPlugin(accountId)\n\n const connectHandler = () => {\n if (!plugin.isConnected()) {\n // some plugins don't set `isConnected() = true` before emitting the\n // connect event, setImmediate has a good chance of working.\n log.error('(!!!) plugin emitted connect, but then returned false for isConnected, broken plugin. account=%s', accountId)\n setImmediate(() => this.add(accountId))\n } else {\n this.add(accountId)\n }\n }\n const disconnectHandler = () => {\n this.remove(accountId)\n }\n\n plugin.on('connect', connectHandler)\n plugin.on('disconnect', disconnectHandler)\n\n this.untrackCallbacks.set(accountId, () => {\n plugin.removeListener('connect', connectHandler)\n plugin.removeListener('disconnect', disconnectHandler)\n })\n\n this.add(accountId)\n }\n\n untrack (accountId: string) {\n this.remove(accountId)\n\n const callback = this.untrackCallbacks.get(accountId)\n\n if (callback) {\n callback()\n }\n }\n\n add (accountId: string) {\n const accountInfo = this.accounts.getInfo(accountId)\n\n let sendRoutes\n if (typeof accountInfo.sendRoutes === 'boolean') {\n sendRoutes = accountInfo.sendRoutes\n } else if (accountInfo.relation !== 'child') {\n sendRoutes = true\n } else {\n sendRoutes = false\n }\n\n let receiveRoutes\n if (typeof accountInfo.receiveRoutes === 'boolean') {\n receiveRoutes = accountInfo.receiveRoutes\n } else if (accountInfo.relation !== 'child') {\n receiveRoutes = true\n } else {\n receiveRoutes = false\n }\n\n if (!sendRoutes && !receiveRoutes) {\n log.warn('not sending/receiving routes for peer, set sendRoutes/receiveRoutes to override. accountId=%s', accountId)\n return\n }\n\n const existingPeer = this.peers.get(accountId)\n if (existingPeer) {\n // Every time we reconnect, we'll send a new route control message to make\n // sure they are still sending us routes.\n const receiver = existingPeer.getReceiver()\n\n if (receiver) {\n receiver.sendRouteControl()\n } else {\n log.warn('unable to send route control message, receiver object undefined. peer=%s', existingPeer)\n }\n\n return\n }\n\n const plugin = this.accounts.getPlugin(accountId)\n\n if (plugin.isConnected()) {\n log.trace('add peer. accountId=%s sendRoutes=%s receiveRoutes=%s', accountId, sendRoutes, receiveRoutes)\n const peer = new Peer({ deps: this.deps, accountId, sendRoutes, receiveRoutes })\n this.peers.set(accountId, peer)\n const receiver = peer.getReceiver()\n if (receiver) {\n receiver.sendRouteControl()\n }\n this.reloadLocalRoutes()\n }\n }\n\n remove (accountId: string) {\n const peer = this.peers.get(accountId)\n\n if (!peer) {\n return\n }\n\n const sender = peer.getSender()\n const receiver = peer.getReceiver()\n\n log.trace('remove peer. peerId=' + accountId)\n if (sender) {\n sender.stop()\n }\n\n // We have to remove the peer before calling updatePrefix on each of its\n // advertised prefixes in order to find the next best route.\n this.peers.delete(accountId)\n if (receiver) {\n for (let prefix of receiver.getPrefixes()) {\n this.updatePrefix(prefix)\n }\n }\n if (this.getAccountRelation(accountId) === 'child') {\n this.updatePrefix(this.accounts.getChildAddress(accountId))\n }\n }\n\n handleRouteControl (sourceAccount: string, routeControl: CcpRouteControlRequest) {\n const peer = this.peers.get(sourceAccount)\n\n if (!peer) {\n log.debug('received route control message from non-peer. sourceAccount=%s', sourceAccount)\n throw new BadRequestError('cannot process route control messages from non-peers.')\n }\n\n const sender = peer.getSender()\n\n if (!sender) {\n log.debug('received route control message from peer not authorized to receive routes from us (sendRoutes=false). sourceAccount=%s', sourceAccount)\n throw new BadRequestError('rejecting route control message, we are configured not to send routes to you.')\n }\n\n sender.handleRouteControl(routeControl)\n }\n\n handleRouteUpdate (sourceAccount: string, routeUpdate: CcpRouteUpdateRequest) {\n const peer = this.peers.get(sourceAccount)\n\n if (!peer) {\n log.debug('received route update from non-peer. sourceAccount=%s', sourceAccount)\n throw new BadRequestError('cannot process route update messages from non-peers.')\n }\n\n const receiver = peer.getReceiver()\n\n if (!receiver) {\n log.debug('received route update from peer not authorized to advertise routes to us (receiveRoutes=false). sourceAccount=%s', sourceAccount)\n throw new BadRequestError('rejecting route update, we are configured not to receive routes from you.')\n }\n\n // Apply import filters\n // TODO Route filters should be much more configurable\n // TODO We shouldn't modify this object in place\n routeUpdate.newRoutes = routeUpdate.newRoutes\n // Filter incoming routes that aren't part of the current global prefix or\n // cover the entire global prefix (i.e. the default route.)\n .filter(route =>\n route.prefix.startsWith(this.getGlobalPrefix()) &&\n route.prefix.length > this.getGlobalPrefix().length\n )\n // Filter incoming routes that include us as a hop (i.e. routing loops)\n .filter(route =>\n !route.path.includes(this.accounts.getOwnAddress())\n )\n\n const changedPrefixes = receiver.handleRouteUpdate(routeUpdate)\n\n let haveRoutesChanged\n for (const prefix of changedPrefixes) {\n haveRoutesChanged = this.updatePrefix(prefix) || haveRoutesChanged\n }\n if (haveRoutesChanged && this.config.routeBroadcastEnabled) {\n // TODO: Should we even trigger an immediate broadcast when routes change?\n // Note that BGP does not do this AFAIK\n for (const peer of this.peers.values()) {\n const sender = peer.getSender()\n if (sender) {\n sender.scheduleRouteUpdate()\n }\n }\n }\n }\n\n reloadLocalRoutes () {\n log.trace('reload local and configured routes.')\n\n this.localRoutes = new Map()\n const localAccounts = this.accounts.getAccountIds()\n\n // Add a route for our own address\n const ownAddress = this.accounts.getOwnAddress()\n this.localRoutes.set(ownAddress, {\n nextHop: '',\n path: [],\n auth: hmac(this.routingSecret, ownAddress)\n })\n\n let defaultRoute = this.config.defaultRoute\n if (defaultRoute === 'auto') {\n defaultRoute = localAccounts.filter(id => this.accounts.getInfo(id).relation === 'parent')[0]\n }\n if (defaultRoute) {\n const globalPrefix = this.getGlobalPrefix()\n this.localRoutes.set(globalPrefix, {\n nextHop: defaultRoute,\n path: [],\n auth: hmac(this.routingSecret, globalPrefix)\n })\n }\n\n for (let accountId of localAccounts) {\n if (this.getAccountRelation(accountId) === 'child') {\n const childAddress = this.accounts.getChildAddress(accountId)\n this.localRoutes.set(childAddress, {\n nextHop: accountId,\n path: [],\n auth: hmac(this.routingSecret, childAddress)\n })\n }\n }\n\n const localPrefixes = Array.from(this.localRoutes.keys())\n const configuredPrefixes = this.config.routes\n ? this.config.routes.map(r => r.targetPrefix)\n : []\n\n for (let prefix of localPrefixes.concat(configuredPrefixes)) {\n this.updatePrefix(prefix)\n }\n }\n\n updatePrefix (prefix: string) {\n const newBest = this.getBestPeerForPrefix(prefix)\n\n return this.updateLocalRoute(prefix, newBest)\n }\n\n getBestPeerForPrefix (prefix: string): Route | undefined {\n // configured routes have highest priority\n const configuredRoute = find(this.config.routes, { targetPrefix: prefix })\n if (configuredRoute) {\n if (this.accounts.exists(configuredRoute.peerId)) {\n return {\n nextHop: configuredRoute.peerId,\n path: [],\n auth: hmac(this.routingSecret, prefix)\n }\n } else {\n log.warn('ignoring configured route, account does not exist. prefix=%s accountId=%s', configuredRoute.targetPrefix, configuredRoute.peerId)\n }\n }\n\n const localRoute = this.localRoutes.get(prefix)\n if (localRoute) {\n return localRoute\n }\n\n const weight = (route: IncomingRoute) => {\n const relation = this.getAccountRelation(route.peer)\n return getRelationPriority(relation)\n }\n\n const bestRoute = Array.from(this.peers.values())\n .map(peer => peer.getReceiver())\n .map(receiver => receiver && receiver.getPrefix(prefix))\n .filter((a): a is IncomingRoute => !!a)\n .sort((a?: IncomingRoute, b?: IncomingRoute) => {\n if (!a && !b) {\n return 0\n } else if (!a) {\n return 1\n } else if (!b) {\n return -1\n }\n\n // First sort by peer weight\n const weightA = weight(a)\n const weightB = weight(b)\n\n if (weightA !== weightB) {\n return weightB - weightA\n }\n\n // Then sort by path length\n const pathA = a.path.length\n const pathB = b.path.length\n\n if (pathA !== pathB) {\n return pathA - pathB\n }\n\n // Finally, tie-break by accountId\n if (a.peer > b.peer) {\n return 1\n } else if (b.peer > a.peer) {\n return -1\n } else {\n return 0\n }\n })[0]\n\n return bestRoute && {\n nextHop: bestRoute.peer,\n path: bestRoute.path,\n auth: bestRoute.auth\n }\n }\n\n getGlobalPrefix () {\n switch (this.config.env) {\n case 'production':\n return 'g'\n case 'test':\n return 'test'\n default:\n throw new Error('invalid value for `env` config. env=' + this.config.env)\n }\n }\n\n getStatus () {\n return {\n routingTableId: this.forwardingRoutingTable.routingTableId,\n currentEpoch: this.forwardingRoutingTable.currentEpoch,\n localRoutingTable: formatRoutingTableAsJson(this.localRoutingTable),\n forwardingRoutingTable: formatForwardingRoutingTableAsJson(this.forwardingRoutingTable),\n routingLog: this.forwardingRoutingTable.log\n .filter(Boolean)\n .map(entry => ({\n ...entry,\n route: entry && entry.route && formatRouteAsJson(entry.route)\n })),\n peers: Array.from(this.peers.values()).reduce((acc, peer) => {\n const sender = peer.getSender()\n const receiver = peer.getReceiver()\n acc[peer.getAccountId()] = {\n send: sender && sender.getStatus(),\n receive: receiver && receiver.getStatus()\n }\n return acc\n }, {})\n }\n }\n\n private updateLocalRoute (prefix: string, route?: Route) {\n const currentBest = this.localRoutingTable.get(prefix)\n const currentNextHop = currentBest && currentBest.nextHop\n const newNextHop = route && route.nextHop\n\n if (newNextHop !== currentNextHop) {\n if (route) {\n log.trace('new best route for prefix. prefix=%s oldBest=%s newBest=%s', prefix, currentNextHop, newNextHop)\n this.localRoutingTable.insert(prefix, route)\n } else {\n log.trace('no more route available for prefix. prefix=%s', prefix)\n this.localRoutingTable.delete(prefix)\n }\n\n this.updateForwardingRoute(prefix, route)\n\n return true\n }\n\n return false\n }\n\n private updateForwardingRoute (prefix: string, route?: Route) {\n if (route) {\n route = {\n ...route,\n path: [this.accounts.getOwnAddress(), ...route.path],\n auth: sha256(route.auth)\n }\n\n if (\n // Routes must start with the global prefix\n !prefix.startsWith(this.getGlobalPrefix()) ||\n\n // Don't publish the default route\n prefix === this.getGlobalPrefix() ||\n\n // Don't advertise local customer routes that we originated. Packets for\n // these destinations should still reach us because we are advertising our\n // own address as a prefix.\n (\n prefix.startsWith(this.accounts.getOwnAddress() + '.') &&\n route.path.length === 1\n ) ||\n\n canDragonFilter(\n this.forwardingRoutingTable,\n this.getAccountRelation,\n prefix,\n route\n )\n ) {\n route = undefined\n }\n }\n\n const currentBest = this.forwardingRoutingTable.get(prefix)\n\n const currentNextHop = currentBest && currentBest.route && currentBest.route.nextHop\n const newNextHop = route && route.nextHop\n\n if (currentNextHop !== newNextHop) {\n const epoch = this.forwardingRoutingTable.currentEpoch++\n const routeUpdate: RouteUpdate = {\n prefix,\n route,\n epoch\n }\n\n this.forwardingRoutingTable.insert(prefix, routeUpdate)\n\n log.trace('logging route update. update=%j', routeUpdate)\n\n if (currentBest) {\n this.forwardingRoutingTable.log[currentBest.epoch] = null\n }\n\n this.forwardingRoutingTable.log[epoch] = routeUpdate\n\n if (route) {\n // We need to re-check any prefixes that start with this prefix to see\n // if we can apply DRAGON filtering.\n //\n // Note that we do this check *after* we have added the new route above.\n const subPrefixes = this.forwardingRoutingTable.getKeysStartingWith(prefix)\n\n for (const subPrefix of subPrefixes) {\n if (subPrefix === prefix) continue\n\n const routeUpdate = this.forwardingRoutingTable.get(subPrefix)\n\n if (!routeUpdate || !routeUpdate.route) continue\n\n this.updateForwardingRoute(subPrefix, routeUpdate.route)\n }\n }\n }\n }\n\n private getAccountRelation = (accountId: string): Relation => {\n return accountId ? this.accounts.getInfo(accountId).relation : 'local'\n }\n}\n"]} |