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# -*- test-case-name: twisted.names.test.test_hosts -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ hosts(5) support. """ from twisted.internet import defer from twisted.internet.abstract import isIPAddress, isIPv6Address from twisted.names import common, dns from twisted.python import failure from twisted.python.compat import nativeString from twisted.python.filepath import FilePath def searchFileForAll(hostsFile, name): """ Search the given file, which is in hosts(5) standard format, for addresses associated with a given name. @param hostsFile: The name of the hosts(5)-format file to search. @type hostsFile: L{FilePath} @param name: The name to search for. @type name: C{bytes} @return: L{None} if the name is not found in the file, otherwise a C{str} giving the address in the file associated with the name. """ results = [] try: lines = hostsFile.getContent().splitlines() except BaseException: return results name = name.lower() for line in lines: idx = line.find(b"#") if idx != -1: line = line[:idx] if not line: continue parts = line.split() if name.lower() in [s.lower() for s in parts[1:]]: try: maybeIP = nativeString(parts[0]) except ValueError: # Not ASCII. continue if isIPAddress(maybeIP) or isIPv6Address(maybeIP): results.append(maybeIP) return results def searchFileFor(file, name): """ Grep given file, which is in hosts(5) standard format, for an address entry with a given name. @param file: The name of the hosts(5)-format file to search. @type file: C{str} or C{bytes} @param name: The name to search for. @type name: C{bytes} @return: L{None} if the name is not found in the file, otherwise a C{str} giving the first address in the file associated with the name. """ addresses = searchFileForAll(FilePath(file), name) if addresses: return addresses[0] return None class Resolver(common.ResolverBase): """ A resolver that services hosts(5) format files. """ def __init__(self, file=b"/etc/hosts", ttl=60 * 60): common.ResolverBase.__init__(self) self.file = file self.ttl = ttl def _aRecords(self, name): """ Return a tuple of L{dns.RRHeader} instances for all of the IPv4 addresses in the hosts file. """ return tuple( dns.RRHeader(name, dns.A, dns.IN, self.ttl, dns.Record_A(addr, self.ttl)) for addr in searchFileForAll(FilePath(self.file), name) if isIPAddress(addr) ) def _aaaaRecords(self, name): """ Return a tuple of L{dns.RRHeader} instances for all of the IPv6 addresses in the hosts file. """ return tuple( dns.RRHeader( name, dns.AAAA, dns.IN, self.ttl, dns.Record_AAAA(addr, self.ttl) ) for addr in searchFileForAll(FilePath(self.file), name) if isIPv6Address(addr) ) def _respond(self, name, records): """ Generate a response for the given name containing the given result records, or a failure if there are no result records. @param name: The DNS name the response is for. @type name: C{str} @param records: A tuple of L{dns.RRHeader} instances giving the results that will go into the response. @return: A L{Deferred} which will fire with a three-tuple of result records, authority records, and additional records, or which will fail with L{dns.DomainError} if there are no result records. """ if records: return defer.succeed((records, (), ())) return defer.fail(failure.Failure(dns.DomainError(name))) def lookupAddress(self, name, timeout=None): """ Read any IPv4 addresses from C{self.file} and return them as L{Record_A} instances. """ name = dns.domainString(name) return self._respond(name, self._aRecords(name)) def lookupIPV6Address(self, name, timeout=None): """ Read any IPv6 addresses from C{self.file} and return them as L{Record_AAAA} instances. """ name = dns.domainString(name) return self._respond(name, self._aaaaRecords(name)) # Someday this should include IPv6 addresses too, but that will cause # problems if users of the API (mainly via getHostByName) aren't updated to # know about IPv6 first. # FIXME - getHostByName knows about IPv6 now. lookupAllRecords = lookupAddress