dist/server/ip-tools.js.map

{
  "version": 3,
  "sources": ["../../server/ip-tools.ts"],
  "sourcesContent": ["/**\n * IP Tools\n * Pokemon Showdown - http://pokemonshowdown.com/\n *\n * IPTools file has various tools for IP parsing and IP-based blocking.\n *\n * These include DNSBLs: DNS-based blackhole lists, which list IPs known for\n * running proxies, spamming, or other abuse.\n *\n * We also maintain our own database of datacenter IP ranges (usually\n * proxies). These are taken from https://github.com/client9/ipcat\n * but include our own database as well.\n *\n * @license MIT\n */\n\nconst BLOCKLISTS = ['sbl.spamhaus.org', 'rbl.efnetrbl.org'];\nconst HOSTS_FILE = 'config/hosts.csv';\nconst PROXIES_FILE = 'config/proxies.csv';\n\nimport * as dns from 'dns';\nimport { FS, Net, Utils } from '../lib';\n\nexport interface AddressRange {\n\tminIP: number;\n\tmaxIP: number;\n\thost?: string;\n}\n\nfunction removeNohost(hostname: string) {\n\t// Convert from old domain.tld.type-nohost format to new domain.tld?/type format\n\tif (hostname?.includes('-nohost')) {\n\t\tconst parts = hostname.split('.');\n\t\tconst suffix = parts.pop();\n\t\treturn `${parts.join('.')}?/${suffix?.replace('-nohost', '')}`;\n\t}\n\treturn hostname;\n}\n\nexport const IPTools = new class {\n\treadonly dnsblCache = new Map<string, string | null>([\n\t\t['127.0.0.1', null],\n\t]);\n\n\treadonly connectionTestCache = new Map<string, boolean>();\n\n\treadonly ipRegex = /^(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])$/;\n\treadonly ipRangeRegex = /^(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9]|\\*)){0,2}\\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9]|\\*)$/;\n\treadonly hostRegex = /^.+\\..{2,}$/;\n\n\tasync lookup(ip: string) {\n\t\tconst [dnsbl, host] = await Promise.all([\n\t\t\tIPTools.queryDnsbl(ip),\n\t\t\tIPTools.getHost(ip),\n\t\t]);\n\t\tconst shortHost = this.shortenHost(host);\n\t\tconst hostType = this.getHostType(shortHost, ip);\n\t\treturn { dnsbl, host, shortHost, hostType };\n\t}\n\n\tqueryDnsblLoop(ip: string, callback: (val: string | null) => void, reversedIpDot: string, index: number) {\n\t\tif (index >= BLOCKLISTS.length) {\n\t\t\t// not in any blocklist\n\t\t\tIPTools.dnsblCache.set(ip, null);\n\t\t\tcallback(null);\n\t\t\treturn;\n\t\t}\n\t\tconst blocklist = BLOCKLISTS[index];\n\t\tdns.lookup(reversedIpDot + blocklist, 4, (err, res) => {\n\t\t\tif (!err) {\n\t\t\t\t// blocked\n\t\t\t\tIPTools.dnsblCache.set(ip, blocklist);\n\t\t\t\tcallback(blocklist);\n\t\t\t\treturn;\n\t\t\t}\n\t\t\t// not blocked, try next blocklist\n\t\t\tIPTools.queryDnsblLoop(ip, callback, reversedIpDot, index + 1);\n\t\t});\n\t}\n\n\t/**\n\t * IPTools.queryDnsbl(ip, callback)\n\t *\n\t * Calls callb\n\t * ack(blocklist), where blocklist is the blocklist domain\n\t * if the passed IP is in a blocklist, or null if the IP is not in\n\t * any blocklist.\n\t *\n\t * Return value matches isBlocked when treated as a boolean.\n\t */\n\tqueryDnsbl(ip: string) {\n\t\tif (!Config.dnsbl) return Promise.resolve(null);\n\t\tif (IPTools.dnsblCache.has(ip)) {\n\t\t\treturn Promise.resolve(IPTools.dnsblCache.get(ip) || null);\n\t\t}\n\t\tconst reversedIpDot = ip.split('.').reverse().join('.') + '.';\n\t\treturn new Promise<string | null>((resolve, reject) => {\n\t\t\tIPTools.queryDnsblLoop(ip, resolve, reversedIpDot, 0);\n\t\t});\n\t}\n\n\t/*********************************************************\n\t * IP parsing\n\t *********************************************************/\n\n\tipToNumber(ip: string) {\n\t\tip = ip.trim();\n\t\tif (ip.includes(':') && !ip.includes('.')) {\n\t\t\t// IPv6, which PS does not support\n\t\t\treturn null;\n\t\t}\n\t\tif (ip.startsWith('::ffff:')) ip = ip.slice(7);\n\t\telse if (ip.startsWith('::')) ip = ip.slice(2);\n\t\tlet num = 0;\n\t\tconst parts = ip.split('.');\n\t\tif (parts.length !== 4) return null;\n\t\tfor (const part of parts) {\n\t\t\tnum *= 256;\n\n\t\t\tconst partAsInt = Utils.parseExactInt(part);\n\t\t\tif (isNaN(partAsInt) || partAsInt < 0 || partAsInt > 255) return null;\n\t\t\tnum += partAsInt;\n\t\t}\n\t\treturn num;\n\t}\n\n\tnumberToIP(num: number) {\n\t\tconst ipParts: string[] = [];\n\t\tif (num < 0 || num >= 256 ** 4 || num !== Math.trunc(num)) return null;\n\t\twhile (num) {\n\t\t\tconst part = num % 256;\n\t\t\tnum = (num - part) / 256;\n\t\t\tipParts.unshift(part.toString());\n\t\t}\n\t\twhile (ipParts.length < 4) ipParts.unshift('0');\n\t\tif (ipParts.length !== 4) return null;\n\t\treturn ipParts.join('.');\n\t}\n\n\tgetCidrRange(cidr: string): AddressRange | null {\n\t\tif (!cidr) return null;\n\t\tconst index = cidr.indexOf('/');\n\t\tif (index <= 0) {\n\t\t\tconst ip = IPTools.ipToNumber(cidr);\n\t\t\tif (ip === null) return null;\n\t\t\treturn { minIP: ip, maxIP: ip };\n\t\t}\n\t\tconst low = IPTools.ipToNumber(cidr.slice(0, index));\n\t\tconst bits = Utils.parseExactInt(cidr.slice(index + 1));\n\t\t// fun fact: IPTools fails if bits <= 1 because JavaScript\n\t\t// does << with signed int32s.\n\t\tif (low === null || !bits || bits < 2 || bits > 32) return null;\n\t\tconst high = low + (1 << (32 - bits)) - 1;\n\t\treturn { minIP: low, maxIP: high };\n\t}\n\t/** Is this an IP range supported by `stringToRange`? Note that exact IPs are also valid IP ranges. */\n\tisValidRange(range: string): boolean {\n\t\treturn IPTools.stringToRange(range) !== null;\n\t}\n\tstringToRange(this: void, range: string | null): AddressRange | null {\n\t\tif (!range) return null;\n\t\tif (range.endsWith('*')) {\n\t\t\tconst parts = range.replace('.*', '').split('.');\n\t\t\tif (parts.length > 3) return null;\n\t\t\tconst [a, b, c] = parts;\n\t\t\tconst minIP = IPTools.ipToNumber(`${a || '0'}.${b || '0'}.${c || '0'}.0`);\n\t\t\tconst maxIP = IPTools.ipToNumber(`${a || '255'}.${b || '255'}.${c || '255'}.255`);\n\t\t\tif (minIP === null || maxIP === null) return null;\n\t\t\treturn { minIP, maxIP };\n\t\t}\n\t\tconst index = range.indexOf('-');\n\t\tif (index <= 0) {\n\t\t\tif (range.includes('/')) return IPTools.getCidrRange(range);\n\t\t\tconst ip = IPTools.ipToNumber(range);\n\t\t\tif (ip === null) return null;\n\n\t\t\treturn { maxIP: ip, minIP: ip };\n\t\t}\n\t\tconst minIP = IPTools.ipToNumber(range.slice(0, index));\n\t\tconst maxIP = IPTools.ipToNumber(range.slice(index + 1));\n\n\t\tif (minIP === null || maxIP === null || maxIP < minIP) return null;\n\t\treturn { minIP, maxIP };\n\t}\n\trangeToString(range: AddressRange, sep = '-') {\n\t\treturn `${this.numberToIP(range.minIP)}${sep}${this.numberToIP(range.maxIP)}`;\n\t}\n\n\t/******************************\n\t * Range management functions *\n\t ******************************/\n\n\tcheckPattern(patterns: AddressRange[], num: number | null) {\n\t\tif (num === null) return false;\n\t\tfor (const pattern of patterns) {\n\t\t\tif (num >= pattern.minIP && num <= pattern.maxIP) {\n\t\t\t\treturn true;\n\t\t\t}\n\t\t}\n\t\treturn false;\n\t}\n\n\t/**\n\t * Returns a checker function for the passed IP range or array of\n\t * ranges. The checker function returns true if its passed IP is\n\t * in the range.\n\t */\n\tchecker(rangeString: string | string[]): (ip: string) => boolean {\n\t\tif (!rangeString?.length) return () => false;\n\t\tlet ranges: AddressRange[] = [];\n\t\tif (typeof rangeString === 'string') {\n\t\t\tconst rangePatterns = IPTools.stringToRange(rangeString);\n\t\t\tif (rangePatterns) ranges = [rangePatterns];\n\t\t} else {\n\t\t\tranges = rangeString.map(IPTools.stringToRange).filter(x => x) as AddressRange[];\n\t\t}\n\t\treturn (ip: string) => {\n\t\t\tconst ipNumber = IPTools.ipToNumber(ip);\n\t\t\treturn IPTools.checkPattern(ranges, ipNumber);\n\t\t};\n\t}\n\n\t/**\n\t * Proxy and host management functions\n\t */\n\tranges: (AddressRange & { host: string })[] = [];\n\tsingleIPOpenProxies = new Set<string>();\n\ttorProxyIps = new Set<string>();\n\tproxyHosts = new Set<string>();\n\tresidentialHosts = new Set<string>();\n\tmobileHosts = new Set<string>();\n\tasync loadHostsAndRanges() {\n\t\tconst data = await FS(HOSTS_FILE).readIfExists() + await FS(PROXIES_FILE).readIfExists();\n\t\t// Strip carriage returns for Windows compatibility\n\t\tconst rows = data.split('\\n').map(row => row.replace('\\r', ''));\n\t\tconst ranges = [];\n\t\tfor (const row of rows) {\n\t\t\tif (!row) continue;\n\t\t\tlet [type, hostOrLowIP, highIP, host] = row.split(',');\n\t\t\tif (!hostOrLowIP) continue;\n\t\t\t// Handle legacy data format\n\t\t\thost = removeNohost(host);\n\t\t\thostOrLowIP = removeNohost(hostOrLowIP);\n\n\t\t\tswitch (type) {\n\t\t\tcase 'IP':\n\t\t\t\tIPTools.singleIPOpenProxies.add(hostOrLowIP);\n\t\t\t\tbreak;\n\t\t\tcase 'HOST':\n\t\t\t\tIPTools.proxyHosts.add(hostOrLowIP);\n\t\t\t\tbreak;\n\t\t\tcase 'RESIDENTIAL':\n\t\t\t\tIPTools.residentialHosts.add(hostOrLowIP);\n\t\t\t\tbreak;\n\t\t\tcase 'MOBILE':\n\t\t\t\tIPTools.mobileHosts.add(hostOrLowIP);\n\t\t\t\tbreak;\n\t\t\tcase 'RANGE':\n\t\t\t\tif (!host) continue;\n\n\t\t\t\tconst minIP = IPTools.ipToNumber(hostOrLowIP);\n\t\t\t\tif (minIP === null) {\n\t\t\t\t\tMonitor.error(`Bad IP address in host or proxy file: '${hostOrLowIP}'`);\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\t\t\t\tconst maxIP = IPTools.ipToNumber(highIP);\n\t\t\t\tif (maxIP === null) {\n\t\t\t\t\tMonitor.error(`Bad IP address in host or proxy file: '${highIP}'`);\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tconst range = { host: IPTools.urlToHost(host), maxIP, minIP };\n\t\t\t\tif (range.maxIP < range.minIP) throw new Error(`Bad range at ${hostOrLowIP}.`);\n\t\t\t\tranges.push(range);\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\t\tIPTools.ranges = ranges;\n\t\tIPTools.sortRanges();\n\t}\n\n\tsaveHostsAndRanges() {\n\t\tlet hostsData = '';\n\t\tlet proxiesData = '';\n\t\tfor (const ip of IPTools.singleIPOpenProxies) {\n\t\t\tproxiesData += `IP,${ip}\\n`;\n\t\t}\n\t\tfor (const host of IPTools.proxyHosts) {\n\t\t\tproxiesData += `HOST,${host}\\n`;\n\t\t}\n\t\tfor (const host of IPTools.residentialHosts) {\n\t\t\thostsData += `RESIDENTIAL,${host}\\n`;\n\t\t}\n\t\tfor (const host of IPTools.mobileHosts) {\n\t\t\thostsData += `MOBILE,${host}\\n`;\n\t\t}\n\t\tIPTools.sortRanges();\n\t\tfor (const range of IPTools.ranges) {\n\t\t\tconst data = `RANGE,${IPTools.rangeToString(range, ',')}${range.host ? `,${range.host}` : ``}\\n`;\n\t\t\tif (range.host?.endsWith('/proxy')) {\n\t\t\t\tproxiesData += data;\n\t\t\t} else {\n\t\t\t\thostsData += data;\n\t\t\t}\n\t\t}\n\t\tvoid FS(HOSTS_FILE).write(hostsData);\n\t\tvoid FS(PROXIES_FILE).write(proxiesData);\n\t}\n\n\taddOpenProxies(ips: string[]) {\n\t\tfor (const ip of ips) {\n\t\t\tIPTools.singleIPOpenProxies.add(ip);\n\t\t}\n\t\treturn IPTools.saveHostsAndRanges();\n\t}\n\n\taddProxyHosts(hosts: string[]) {\n\t\tfor (const host of hosts) {\n\t\t\tIPTools.proxyHosts.add(host);\n\t\t}\n\t\treturn IPTools.saveHostsAndRanges();\n\t}\n\n\taddMobileHosts(hosts: string[]) {\n\t\tfor (const host of hosts) {\n\t\t\tIPTools.mobileHosts.add(host);\n\t\t}\n\t\treturn IPTools.saveHostsAndRanges();\n\t}\n\n\taddResidentialHosts(hosts: string[]) {\n\t\tfor (const host of hosts) {\n\t\t\tIPTools.residentialHosts.add(host);\n\t\t}\n\t\treturn IPTools.saveHostsAndRanges();\n\t}\n\n\tremoveOpenProxies(ips: string[]) {\n\t\tfor (const ip of ips) {\n\t\t\tIPTools.singleIPOpenProxies.delete(ip);\n\t\t}\n\t\treturn IPTools.saveHostsAndRanges();\n\t}\n\n\tremoveResidentialHosts(hosts: string[]) {\n\t\tfor (const host of hosts) {\n\t\t\tIPTools.residentialHosts.delete(host);\n\t\t}\n\t\treturn IPTools.saveHostsAndRanges();\n\t}\n\n\tremoveProxyHosts(hosts: string[]) {\n\t\tfor (const host of hosts) {\n\t\t\tIPTools.proxyHosts.delete(host);\n\t\t}\n\t\treturn IPTools.saveHostsAndRanges();\n\t}\n\n\tremoveMobileHosts(hosts: string[]) {\n\t\tfor (const host of hosts) {\n\t\t\tIPTools.mobileHosts.delete(host);\n\t\t}\n\t\treturn IPTools.saveHostsAndRanges();\n\t}\n\n\trangeIntersects(a: AddressRange, b: AddressRange) {\n\t\ttry {\n\t\t\tthis.checkRangeConflicts(a, [b]);\n\t\t} catch {\n\t\t\treturn true;\n\t\t}\n\t\treturn false;\n\t}\n\n\tcheckRangeConflicts(insertion: AddressRange, sortedRanges: AddressRange[], widen?: boolean) {\n\t\tif (insertion.maxIP < insertion.minIP) {\n\t\t\tthrow new Error(\n\t\t\t\t`Invalid data for address range ${IPTools.rangeToString(insertion)} (${insertion.host})`\n\t\t\t);\n\t\t}\n\n\t\tlet iMin = 0;\n\t\tlet iMax = sortedRanges.length;\n\t\twhile (iMin < iMax) {\n\t\t\tconst i = Math.floor((iMax + iMin) / 2);\n\t\t\tif (insertion.minIP > sortedRanges[i].minIP) {\n\t\t\t\tiMin = i + 1;\n\t\t\t} else {\n\t\t\t\tiMax = i;\n\t\t\t}\n\t\t}\n\t\tif (iMin < sortedRanges.length) {\n\t\t\tconst next = sortedRanges[iMin];\n\t\t\tif (insertion.minIP === next.minIP && insertion.maxIP === next.maxIP) {\n\t\t\t\tthrow new Error(`The address range ${IPTools.rangeToString(insertion)} (${insertion.host}) already exists`);\n\t\t\t}\n\t\t\tif (insertion.minIP <= next.minIP && insertion.maxIP >= next.maxIP) {\n\t\t\t\tif (widen) {\n\t\t\t\t\tif (sortedRanges[iMin + 1]?.minIP <= insertion.maxIP) {\n\t\t\t\t\t\tthrow new Error(\"You can only widen one address range at a time.\");\n\t\t\t\t\t}\n\t\t\t\t\treturn iMin;\n\t\t\t\t}\n\t\t\t\tthrow new Error(\n\t\t\t\t\t`Too wide: ${IPTools.rangeToString(insertion)} (${insertion.host})\\n` +\n\t\t\t\t\t`Intersects with: ${IPTools.rangeToString(next)} (${next.host})`\n\t\t\t\t);\n\t\t\t}\n\t\t\tif (insertion.maxIP >= next.minIP) {\n\t\t\t\tthrow new Error(\n\t\t\t\t\t`Could not insert: ${IPTools.rangeToString(insertion)} ${insertion.host}\\n` +\n\t\t\t\t\t`Intersects with: ${IPTools.rangeToString(next)} (${next.host})`\n\t\t\t\t);\n\t\t\t}\n\t\t}\n\t\tif (iMin > 0) {\n\t\t\tconst prev = sortedRanges[iMin - 1];\n\t\t\tif (insertion.minIP >= prev.minIP && insertion.maxIP <= prev.maxIP) {\n\t\t\t\tthrow new Error(\n\t\t\t\t\t`Too narrow: ${IPTools.rangeToString(insertion)} (${insertion.host})\\n` +\n\t\t\t\t\t`Intersects with: ${IPTools.rangeToString(prev)} (${prev.host})`\n\t\t\t\t);\n\t\t\t}\n\t\t\tif (insertion.minIP <= prev.maxIP) {\n\t\t\t\tthrow new Error(\n\t\t\t\t\t`Could not insert: ${IPTools.rangeToString(insertion)} (${insertion.host})\\n` +\n\t\t\t\t\t`Intersects with: ${IPTools.rangeToString(prev)} (${prev.host})`\n\t\t\t\t);\n\t\t\t}\n\t\t}\n\t}\n\n\t/*********************************************************\n\t * Range handling functions\n\t *********************************************************/\n\n\turlToHost(url: string) {\n\t\tif (url.startsWith('http://')) url = url.slice(7);\n\t\tif (url.startsWith('https://')) url = url.slice(8);\n\t\tif (url.startsWith('www.')) url = url.slice(4);\n\t\tconst slashIndex = url.indexOf('/');\n\t\tif (slashIndex > 0 && url[slashIndex - 1] !== '?') url = url.slice(0, slashIndex);\n\t\treturn url;\n\t}\n\n\tsortRanges() {\n\t\tUtils.sortBy(IPTools.ranges, range => range.minIP);\n\t}\n\n\tgetRange(minIP: number, maxIP: number) {\n\t\tfor (const range of IPTools.ranges) {\n\t\t\tif (range.minIP === minIP && range.maxIP === maxIP) return range;\n\t\t}\n\t}\n\n\taddRange(range: AddressRange & { host: string }) {\n\t\tif (IPTools.getRange(range.minIP, range.maxIP)) {\n\t\t\tIPTools.removeRange(range.minIP, range.maxIP);\n\t\t}\n\t\tIPTools.ranges.push(range);\n\t\treturn IPTools.saveHostsAndRanges();\n\t}\n\n\tremoveRange(minIP: number, maxIP: number) {\n\t\tIPTools.ranges = IPTools.ranges.filter(dc => dc.minIP !== minIP || dc.maxIP !== maxIP);\n\t\treturn IPTools.saveHostsAndRanges();\n\t}\n\n\t/**\n\t * Will not reject; IPs with no RDNS entry will resolve to\n\t * '[byte1].[byte2]?/unknown'.\n\t */\n\tgetHost(ip: string) {\n\t\treturn new Promise<string>(resolve => {\n\t\t\tif (!ip) {\n\t\t\t\tresolve('');\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst ipNumber = IPTools.ipToNumber(ip);\n\t\t\tif (ipNumber === null) throw new Error(`Bad IP address: '${ip}'`);\n\t\t\tfor (const range of IPTools.ranges) {\n\t\t\t\tif (ipNumber >= range.minIP && ipNumber <= range.maxIP) {\n\t\t\t\t\tresolve(range.host);\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t}\n\t\t\tdns.reverse(ip, (err, hosts) => {\n\t\t\t\tif (err) {\n\t\t\t\t\tresolve(`${ip.split('.').slice(0, 2).join('.')}?/unknown`);\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\tif (!hosts?.[0]) {\n\t\t\t\t\tif (ip.startsWith('50.')) {\n\t\t\t\t\t\tresolve('comcast.net?/res');\n\t\t\t\t\t} else if (ipNumber >= telstraRange.minIP && ipNumber <= telstraRange.maxIP) {\n\t\t\t\t\t\tresolve(telstraRange.host);\n\t\t\t\t\t} else {\n\t\t\t\t\t\tthis.testConnection(ip, result => {\n\t\t\t\t\t\t\tif (result) {\n\t\t\t\t\t\t\t\tresolve(`${ip.split('.').slice(0, 2).join('.')}?/proxy`);\n\t\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\t\tresolve(`${ip.split('.').slice(0, 2).join('.')}?/unknown`);\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t});\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\tresolve(hosts[0]);\n\t\t\t\t}\n\t\t\t});\n\t\t});\n\t}\n\n\t/**\n\t * Does this IP respond to port 80? In theory, proxies are likely to\n\t * respond, while residential connections are likely to reject connections.\n\t *\n\t * Callback is guaranteed to be called exactly once, within a 1000ms\n\t * timeout.\n\t */\n\ttestConnection(ip: string, callback: (result: boolean) => void) {\n\t\tconst cachedValue = this.connectionTestCache.get(ip);\n\t\tif (cachedValue !== undefined) {\n\t\t\treturn callback(cachedValue);\n\t\t}\n\n\t\t// Node.js's documentation does not make this easy to write. I discovered\n\t\t// this behavior by manual testing:\n\n\t\t// A successful connection emits 'connect', which you should react to\n\t\t// with socket.destroy(), which emits 'close'.\n\n\t\t// Some IPs instantly reject connections, emitting 'error' followed\n\t\t// immediately by 'close'.\n\n\t\t// Some IPs just never respond, leaving you to time out. Node will\n\t\t// emit the 'timeout' event, but not actually do anything else, leaving\n\t\t// you to manually use socket.destroy(), which emits 'close'\n\n\t\tlet connected = false;\n\t\tconst socket = require('net').createConnection({\n\t\t\tport: 80,\n\t\t\thost: ip,\n\t\t\ttimeout: 1000,\n\t\t}, () => {\n\t\t\tconnected = true;\n\t\t\tthis.connectionTestCache.set(ip, true);\n\t\t\tsocket.destroy();\n\t\t\treturn callback(true);\n\t\t});\n\t\tsocket.on('error', () => {});\n\t\tsocket.on('timeout', () => socket.destroy());\n\t\tsocket.on('close', () => {\n\t\t\tif (!connected) {\n\t\t\t\tthis.connectionTestCache.set(ip, false);\n\t\t\t\treturn callback(false);\n\t\t\t}\n\t\t});\n\t}\n\n\tshortenHost(host: string) {\n\t\tif (host.split('.').pop()?.includes('/')) return host; // It has a suffix, e.g. leaseweb.com?/proxy\n\t\tlet dotLoc = host.lastIndexOf('.');\n\t\tconst tld = host.slice(dotLoc);\n\t\tif (tld === '.uk' || tld === '.au' || tld === '.br') dotLoc = host.lastIndexOf('.', dotLoc - 1);\n\t\tdotLoc = host.lastIndexOf('.', dotLoc - 1);\n\t\treturn host.slice(dotLoc + 1);\n\t}\n\n\t/**\n\t * Host types:\n\t * - 'res' - normal residential ISP\n\t * - 'shared' - like res, but shared among many people: bans will have collateral damage\n\t * - 'mobile' - like res, but unstable IP (IP bans don't work)\n\t * - 'proxy' - datacenters, VPNs, proxy services, other untrustworthy sources\n\t *   (note that bots will usually be hosted on these)\n\t * - 'res?' - likely res, but host not specifically whitelisted\n\t * - 'unknown' - no rdns entry, treat with suspicion\n\t */\n\tgetHostType(host: string, ip: string) {\n\t\tif (Punishments.isSharedIp(ip)) {\n\t\t\treturn 'shared';\n\t\t}\n\t\tif (this.singleIPOpenProxies.has(ip) || this.torProxyIps.has(ip)) {\n\t\t\t// single-IP open proxies\n\t\t\treturn 'proxy';\n\t\t}\n\n\t\tif (/^he\\.net(\\?|)\\/proxy$/.test(host)) {\n\t\t\t// Known to only be VPN services\n\t\t\tif (['74.82.60.', '72.52.87.', '65.49.126.'].some(range => ip.startsWith(range))) {\n\t\t\t\treturn 'proxy';\n\t\t\t}\n\t\t\t// Hurricane Electric has an annoying habit of having residential\n\t\t\t// internet and datacenters on the same IP ranges - we get a lot of\n\t\t\t// legitimate users as well as spammers on VPNs from HE.\n\n\t\t\t// This splits the difference and treats it like any other unknown IP.\n\t\t\treturn 'unknown';\n\t\t}\n\t\t// There were previously special cases for\n\t\t// 'digitalocean.proxy-nohost', 'servihosting.es.proxy-nohost'\n\t\t// DO is commonly used to host bots; I don't know who whitelisted\n\t\t// servihosting but I assume for a similar reason. This isn't actually\n\t\t// tenable; any service that can host bots can and does also host proxies.\n\t\tif (this.proxyHosts.has(host) || host.endsWith('/proxy')) {\n\t\t\treturn 'proxy';\n\t\t}\n\t\tif (this.residentialHosts.has(host) || host.endsWith('/res')) {\n\t\t\treturn 'res';\n\t\t}\n\t\tif (this.mobileHosts.has(host) || host.endsWith('/mobile')) {\n\t\t\treturn 'mobile';\n\t\t}\n\t\tif (/^ip-[0-9]+-[0-9]+-[0-9]+\\.net$/.test(host) || /^ip-[0-9]+-[0-9]+-[0-9]+\\.eu$/.test(host)) {\n\t\t\t// OVH\n\t\t\treturn 'proxy';\n\t\t}\n\n\t\tif (host.endsWith('/unknown')) {\n\t\t\t// rdns entry doesn't exist, and IP doesn't respond to a probe on port 80\n\t\t\treturn 'unknown';\n\t\t}\n\n\t\t// rdns entry exists but is unrecognized\n\t\treturn 'res?';\n\t}\n\tasync updateTorRanges() {\n\t\ttry {\n\t\t\tconst raw = await Net('https://check.torproject.org/torbulkexitlist').get();\n\t\t\tconst torIps = raw.split('\\n');\n\t\t\tfor (const ip of torIps) {\n\t\t\t\tif (this.ipRegex.test(ip)) {\n\t\t\t\t\tthis.torProxyIps.add(ip);\n\t\t\t\t}\n\t\t\t}\n\t\t} catch {}\n\t}\n};\n\nconst telstraRange: AddressRange & { host: string } = {\n\tminIP: IPTools.ipToNumber(\"101.160.0.0\")!,\n\tmaxIP: IPTools.ipToNumber(\"101.191.255.255\")!,\n\thost: 'telstra.net?/res',\n};\n\nexport default IPTools;\n\nvoid IPTools.updateTorRanges();\n"],
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}