{"id":15634941,"url":"https://github.com/zfl9/dns2tcp","last_synced_at":"2025-05-07T13:01:36.202Z","repository":{"id":102041632,"uuid":"205379462","full_name":"zfl9/dns2tcp","owner":"zfl9","description":"将 dns 查询从 udp 转为 tcp 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dns2tcp\n\n一个 DNS 实用工具，用于将 DNS 查询从 UDP 转为 TCP。\n\n当然有很多 DNS 工具都可以实现这个功能，比如 pdnsd、dnsforwarder；但如果你只是想使用其 UDP 转 TCP 功能（比如配合 dnsmasq，将 dnsmasq 向上游发出的 DNS 查询从 UDP 转为 TCP），那么 dns2tcp 可能是更好的选择。\n\n`dns2tcp` 设计的非常简洁以及易用，它不需要任何配置文件，在命令行参数中指定一个 **本地 UDP 监听地址** 以及一个 **远程 DNS 服务器地址**（该 DNS 服务器支持 TCP 查询）即可，没有任何多余功能。\n\n## 如何编译\n\n\u003e 为了方便使用，[releases](https://github.com/zfl9/dns2tcp/releases) 页面发布了 linux 下常见架构的 musl 静态链接二进制。\n\n```bash\ngit clone https://github.com/zfl9/dns2tcp\ncd dns2tcp\nmake \u0026\u0026 sudo make install\n```\n\ndns2tcp 默认安装到 `/usr/local/bin/dns2tcp`，可安装到其它目录，如 `make install DESTDIR=/opt/local/bin`。\n\n交叉编译时只需指定 CC 变量，如 `make CC=aarch64-linux-gnu-gcc`（若报错，请先执行 `make clean`，然后再试）。\n\n## 如何运行\n\n```bash\n# sh/bash 可以不加引号，zsh 必须加引号，防止#被转义\n# UPDATE: 从 v1.1.1 版本开始可以省略端口号，默认是 53\ndns2tcp -L \"127.0.0.1#5353\" -R \"8.8.8.8#53\"\n\n# 如果想在后台运行，可以这样做：\n(dns2tcp -L \"127.0.0.1#5353\" -R \"8.8.8.8#53\" \u003c/dev/null \u0026\u003e\u003e/var/log/dns2tcp.log \u0026)\n```\n\n- `-L` 选项指定本地监听地址，该监听地址接受 UDP 协议的 DNS 查询。\n- `-R` 选项指定远程 DNS 服务器地址，该 DNS 服务器应支持 TCP 查询。\n\n## 小技巧\n\n借助 iptables，将本机发往 8.8.8.8:53 的 UDP 查询请求，强行重定向至本机 dns2tcp 监听端口，这样就可以不用修改原有 dns 组件的配置，无感转换为 TCP 查询。还是上面那个例子，在启动 dns2tcp 之后，再执行如下 iptables 命令：\n\n```bash\n# 将目标地址为 8.8.8.8:53/udp 的包重定向至 dns2tcp 监听端口，实现透明 udp2tcp 转换\niptables -t nat -A OUTPUT -p udp -d 8.8.8.8 --dport 53 -j REDIRECT --to-ports 5353\n```\n\n你可以在本机使用 `dig @8.8.8.8 baidu.com` 测试，观察 dns2tcp 日志（带上 -v），就会发现走 TCP 出去了。\n\n## 全部参数\n\n```console\nusage: dns2tcp \u003c-L listen\u003e \u003c-R remote\u003e [options...]\n -L \u003cip[#port]\u003e          udp listen address, port default to 53\n -R \u003cip[#port]\u003e          tcp remote address, port default to 53\n -l \u003cip[#port]\u003e          tcp local address, port default to 0\n -s \u003csyncnt\u003e             set TCP_SYNCNT option for tcp socket\n -6                      set IPV6_V6ONLY option for udp socket\n -r                      set SO_REUSEPORT option for udp socket\n -v                      print verbose log, used for debugging\n -V                      print version number of dns2tcp and exit\n -h                      print help information of dns2tcp and exit\nbug report: https://github.com/zfl9/dns2tcp. email: zfl9.com@gmail.com\n```\n\n`-l`：设置`TCP`连接的本地地址（源地址），`0地址`或`0端口`表示由系统选择。\n\n`-s`：对`TCP`套接字设置`TCP_SYNCNT`，该选项值将影响`TCP`的连接超时时间。\n\n`-6`：对`UDP`套接字设置`IPV6_V6ONLY`，建议始终启用，把 v4 和 v6 监听严格区分开。\n\n`-r`：对`UDP`套接字设置`SO_REUSEPORT`，用于多进程负载均衡，Linux 3.9+ 开始可用。\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fzfl9%2Fdns2tcp","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fzfl9%2Fdns2tcp","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fzfl9%2Fdns2tcp/lists"}