proxylib.py 文件源码

def gethostbyname2(self, hostname):
        try:
            iplist = self.dns_cache[hostname]
        except KeyError:
            if re.match(r'^\d+\.\d+\.\d+\.\d+$', hostname) or ':' in hostname:
                iplist = [hostname]
            elif self.dns_servers:
                try:
                    record = dnslib_resolve_over_udp(hostname, self.dns_servers, timeout=2, blacklist=self.dns_blacklist)
                except socket.gaierror:
                    record = dnslib_resolve_over_tcp(hostname, self.dns_servers, timeout=2, blacklist=self.dns_blacklist)
                iplist = dnslib_record2iplist(record)
            else:
                iplist = socket.gethostbyname_ex(hostname)[-1]
            self.dns_cache[hostname] = iplist
        return iplist