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41 lines
No EOL
1.4 KiB
Python
41 lines
No EOL
1.4 KiB
Python
# -*- coding: utf-8 -*-
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# 此模块用于解析 SRV 记录，返回值为 IP 和 解析类型(srv 或者 normal)
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import dns.resolver
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def dns_lookup(ip):
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# 因为第一次解析是面向于 SRV 的，所以需要做是否带端口号的判断
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if ':' in ip:
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type = f'normal'
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return ip, type
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# 自定义 DNS 解析器
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resolver = dns.resolver.Resolver()
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resolver.nameservers = ['223.5.5.5', '223.6.6.6'] # 添加备用DNS
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resolver.timeout = 5 # 单次查询超时时间
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resolver.lifetime = 10 # 总解析时间限制
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try:
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print(f'正在解析 SRV 记录: _minecraft._tcp.{ip}')
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answers = resolver.resolve(f'_minecraft._tcp.{ip}', 'SRV')
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# address 的源输出末端有沟槽的 "."，去掉它
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address = str(answers[0].target).rstrip('.')
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port = answers[0].port
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# 拼接端口号,赋值 SRV
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ip = f'{address}:{port}'
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print(f'解析出 SRV 地址: {ip}')
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type = f'srv'
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return ip, type
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except dns.resolver.NoAnswer:
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print(f'无法解析SRV记录: _minecraft._tcp.{ip} (DNS服务器无答应)')
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except dns.resolver.NXDOMAIN:
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print(f'域名不存在SRV记录: _minecraft._tcp.{ip}')
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except (dns.resolver.Timeout, dns.resolver.LifetimeTimeout):
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print(f'DNS解析超时: {ip}')
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except Exception as e:
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print(f'DNS解析出现未知错误: {e}')
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type = f'normal'
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return ip, type |