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ssh-bridge: 在 Linux 虚拟机中转发消息的简单实现 (UNIX socket)

  • 2026-06-30 01:29:19
ssh-bridge: 在 Linux 虚拟机中转发消息的简单实现 (UNIX socket)

注: 代码是 AI (豆包) 写的 (然后有少量人工修改), 并经过手动功能测试.

如果有 2 个 SSH 连接到同一个 Linux 虚拟机, 那么这 2 个之间, 如何方便的互相发送消息呢 ?

本文就来编写一个简单的小小的程序, 来实现这个功能.

这里是 (希望消除 稀缺 的) 穷人小水滴, 专注于 穷人友好型 低成本技术. (本文为 93 号作品. )


相关文章:

参考资料:

  • • https://man.archlinux.org/man/ssh.1
  • • https://developer.mozilla.org/en-US/docs/Web/API/TransformStream
  • • https://docs.deno.com/api/deno/~/Deno.Conn
  • • https://docs.deno.com/api/deno/~/Deno.stdin
  • • https://docs.deno.com/api/deno/~/Deno.mkdir
  • • https://jsr.io/@std/streams/doc/~/TextLineStream
  • • https://jsr.io/@std/path
  • • https://github.com/denoland/deno/discussions/23495

目录

  • • 1 主要设计
  • • 2 测试运行
  • • 3 总结与展望
  • • 附录 1 源代码
  • • 附录 2 cat-dir.sh

1 主要设计

主要设计目标是尽量简单, 轻量.

程序采用 C/S 结构, 也就是分为 客户端 (client) 和 服务端 (server) 2 部分.

其中服务端作为 systemd user service 启动运行, 在 UNIX socket $XDG_RUNTIME_DIR/ssh-bridge/server 监听, 比如: /run/user/1000/ssh-bridge/server

客户端连接到同一个地址. 这个目录有合适的默认权限控制, 只有同一个普通用户 (user) 才能访问.

进程间通信协议是简单的 单行文本 协议, 也就是每一行是一条消息 (用换行字符 \n 分隔).

每一行的格式为:

channel:{"json":"data"}

前面是 通道 名, 后面是 JSON 格式的任意数据.

服务端简单的把收到的每一条消息, 都 广播 发送给所有连接的客户端. 服务端只做消息格式检查 (JSON 格式是否正确), 此外不做任何处理.

客户端使用命令行参数 --pub 指定允许发布的通道, --sub 指定接收的通道. 客户端自己做消息过滤处理, 把进程的 stdin 收到的消息发送给服务端, 把来自服务端的消息发送到 stdout.

没错, 这是一个通过简单广播实现的 发布/订阅 模型, 喵呜 !~~

2 测试运行

首先, 配置好到 Linux 虚拟机的 ssh 连接, 比如:

> ssh arch202605ai1
Welcome to fish, the friendly interactive shell
Type helpfor instructions on how to use fish
ai1@arch202605ai1 ~> 

并且安装 deno:

ai1@arch202605ai1 ~> deno --version
deno 2.7.14 (stable, release, x86_64-unknown-linux-gnu)
v8 14.7.173.20-rusty
typescript 5.9.2

然后从 npm 下载代码: https://www.npmjs.com/package/vm-ssh-bridge


好了, 你已经把所需代码下载到虚拟机中了, 下面是安装步骤:

cd ssh-bridge/
mkdir -p ~/.ssh-bridge/
cp bin/sb-server.js bin/sb-client.js ~/.ssh-bridge/
mkdir -p ~/.config/systemd/user/
cp systemd-user/sb-server.service ~/.config/systemd/user/
systemctl --user daemon-reload
systemctl --user start sb-server

然后用一下命令查看服务端运行是否正常:

systemctl --user status sb-server

好, 接下来在本机 (不是上面连接到的 虚拟机) 进行测试:

> ssh arch202605ai1 "deno run --allow-env --allow-read --allow-write ~/.ssh-bridge/sb-client.js"
default: {"test":666}
default: {"test":666}

其中 default: {"test":666} 是手动输入的, 下一行是来自 服务端 的回显.

然后在另一个新的终端中运行:

> ssh arch202605ai1 "deno run --allow-env --allow-read --allow-write ~/.ssh-bridge/sb-client.js --pub test"
test: {"ok":2333}
test: {"ok":2333}

此时前一个终端会看到:

> ssh arch202605ai1 "deno run --allow-env --allow-read --allow-write ~/.ssh-bridge/sb-client.js"
default: {"test":666}
default: {"test":666}
test: {"ok":2333}

成功通过 ssh 转发了消息, 撒花 ~

3 总结与展望

本文使用 AI 写了一个很简单的程序代码, 实现了通过 SSH 在同一个 Linux 虚拟机中转发消息的功能.

这不仅测试了 AI 写代码的能力, 也了解了 订阅/发布 这种常见的模型. 是一次很愉快的玩耍哟 ~

附录 1 源代码

可以从 npm 获取完整源代码: https://www.npmjs.com/package/vm-ssh-bridge

  • • 文件 ssh-bridge/src/util.ts:
import * as path from"@std/path";
import { TextLineStream } from"@std/streams/text-line-stream";

exportinterfaceMessage {
channelstring;
dataunknown;
}

exportfunctionparseLine(linestring): Message | undefined {
try {
// first `:`
const i = line.indexOf(":");
if (i > 0) {
const channel = line.slice(0, i);
const jsonStr = line.slice(i + 1);
return {
        channel,
dataJSON.parse(jsonStr),
      };
    }
  } catch (e) {
// ignore
console.error("bad line", line);
console.log(e);
  }
}

exportfunctionformatMessage(channelstringdataunknown): string {
const jsonStr = JSON.stringify(data);
return`${channel}${jsonStr}\n`;
}

// UNIX socket: $XDG_RUNTIME_DIR/ssh-bridge/server
exportfunctiongetSocketPath(): [stringstring] {
const runtimeDir = Deno.env.get("XDG_RUNTIME_DIR");
if (!runtimeDir) {
console.error("XDG_RUNTIME_DIR environment variable is not set");
Deno.exit(1);
  }

const dir = path.join(runtimeDir, "ssh-bridge");
const socketPath = path.join(dir, "server");

return [socketPath, dir];
}

exportasyncfunctionreadLines(
readableReadableStream<Uint8Array<ArrayBuffer>>,
): AsyncGenerator<string> {
const s = readable.pipeThrough<string>(newTextDecoderStream()).pipeThrough<
string
  >(newTextLineStream());
forawait (const i of s) {
yield i;
  }
}
  • • 文件 ssh-bridge/src/sb-server.ts:
// sb-server.js
import { formatMessage, getSocketPath, parseLine, readLines } from"./util.ts";

const connections = newSet<Deno.Conn>();

asyncfunctionhandleConnection(connDeno.Conn) {
  connections.add(conn);
const encoder = newTextEncoder();

try {
forawait (const line ofreadLines(conn.readable)) {
const msg = parseLine(line);
if (!msg) continue;

const outputLine = formatMessage(msg.channel, msg.data);
const buf = encoder.encode(outputLine);

for (const writer of connections) {
try {
// NO `await` here, do not block !
          writer.write(buf);
        } catch (e) {
// ignore
console.error(e);
        }
      }
    }
  } catch (e) {
// ignore
console.error(e);
  }

// clean up
  connections.delete(conn);
try {
    conn.close();
  } catch (e) {
// ignore
console.error(e);
  }
}

asyncfunctionmain() {
const [socketPath, dir] = getSocketPath();

awaitDeno.mkdir(dir, { recursivetrue });
try {
awaitDeno.remove(socketPath);
  } catch (e) {
// ignore
console.error(e);
  }

const listener = Deno.listen({ path: socketPath, transport"unix" });
console.log(`Listening on ${socketPath}`);

forawait (const conn of listener) {
handleConnection(conn);
  }
}

awaitmain();
  • • 文件 ssh-bridge/src/sb-client.ts:
// sb-client.js
import { formatMessage, getSocketPath, parseLine, readLines } from"./util.ts";

// TODO --version --help
// --pub XXX --sub AAA --sub BBB
functionparseArgs() {
const args = Deno.args;
const pub = newSet<string>();
const sub = newSet<string>();
let i = 0;

while (i < args.length) {
const arg = args[i];
if (("--pub" == arg) && (i + 1 < args.length)) {
      pub.add(args[i + 1]);
      i += 2;
    } elseif (("--sub" == arg) && (i + 1 < args.length)) {
      sub.add(args[i + 1]);
      i += 2;
    } else {
console.error("ERROR: bad CLI arg: " + arg);
Deno.exit(1);
    }
  }

if (pub.size < 1) {
    pub.add("default");
  }

return { pub, sub };
}

asyncfunctionstdinToServer(connDeno.ConnpubSet<string>) {
const encoder = newTextEncoder();

try {
forawait (const line ofreadLines(Deno.stdin.readable)) {
const msg = parseLine(line);
if (!msg) continue;
if (!pub.has(msg.channel)) continue;

await conn.write(encoder.encode(formatMessage(msg.channel, msg.data)));
    }
  } catch (e) {
// ignore
console.error(e);
  } finally {
    conn.closeWrite();
  }
}

asyncfunctionserverToStdout(connDeno.ConnsubSet<string>) {
const encoder = newTextEncoder();

try {
forawait (const line ofreadLines(conn.readable)) {
const msg = parseLine(line);
if (!msg) continue;

if (sub.size > 0 && !sub.has(msg.channel)) {
continue;
      }

awaitDeno.stdout.write(
        encoder.encode(formatMessage(msg.channel, msg.data)),
      );
    }
  } finally {
    conn.close();
  }
}

asyncfunctionmain() {
const { pub, sub } = parseArgs();

const [socketPath] = getSocketPath();

const conn = awaitDeno.connect({ path: socketPath, transport"unix" });

awaitPromise.all([
stdinToServer(conn, pub),
serverToStdout(conn, sub),
  ]);
}

awaitmain();
  • • 文件 ssh-bridge/systemd-user/sb-server.service:
[Unit]
Description=SSH Bridge Server
After=network.target

[Service]
Type=simple
ExecStart=deno run --allow-env --allow-read --allow-write --allow-net %h/.ssh-bridge/sb-server.js
Restart=always

[Install]
WantedBy=default.target
  • • 文件 ssh-bridge/deno.json:
{
"imports":{
"@std/path":"jsr:@std/path@^1.1.4",
"@std/streams":"jsr:@std/streams@^1.1.0"
}
}

附录 2 cat-dir.sh

这个小脚本也是 AI 写的代码. 功能是把一个目录中的所有文件, 打包成一个文本文件.

比如:

mkdir src
echo"// TODO" > src/1.js
echo"console.log(666);" > src/2.js
> ./cat-dir.sh src src.txt
Done! Output written to src.txt

然后生成的 src.txt 文件内容是:

> cat src/1.js
// TODO

> cat src/2.js
console.log(666);

因为现在大部分 AI (聊天 app) 不支持直接上传 zip 压缩包 (只支持上传 txt 文件). 所以就可以把这个打包成的 txt 方便的上传给 AI 愉快的开始处理啦 ~


  • • 文件 cat-dir.sh:
#!/bin/bash

if [ $# -ne 2 ]; then
echo"Usage: $0 input-dir output.txt"
exit 1
fi

INPUT_DIR="$1"
OUTPUT_FILE="$2"

rm -f "$OUTPUT_FILE"

while IFS= read -r -d $'\0' file; do
echo"> cat $file" >> "$OUTPUT_FILE"
cat"$file" >> "$OUTPUT_FILE"
echo >> "$OUTPUT_FILE"
done < <(find "$INPUT_DIR" -type f -print0)

echo"Done! Output written to $OUTPUT_FILE"

本文使用 CC-BY-SA 4.0 许可发布.

本文使用 微信 Markdown 编辑器 格式化发布: https://github.com/doocs/md

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  1. CONNECT:[ UseTime:0.000567s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000663s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003985s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.012444s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000562s ]
  6. SELECT * FROM `set` [ RunTime:0.000530s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000672s ]
  8. SELECT * FROM `article` WHERE `id` = 491957 LIMIT 1 [ RunTime:0.000559s ]
  9. UPDATE `article` SET `lasttime` = 1783108168 WHERE `id` = 491957 [ RunTime:0.036371s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.001087s ]
  11. SELECT * FROM `article` WHERE `id` < 491957 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005078s ]
  12. SELECT * FROM `article` WHERE `id` > 491957 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000433s ]
  13. SELECT * FROM `article` WHERE `id` < 491957 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000798s ]
  14. SELECT * FROM `article` WHERE `id` < 491957 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000616s ]
  15. SELECT * FROM `article` WHERE `id` < 491957 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002869s ]
0.138291s