root
48 lines
2.8 KiB
JavaScript
48 lines
2.8 KiB
JavaScript
#!/usr/bin/env node
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import net from "node:net";
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const [proxyHost, proxyPortRaw, targetHost, targetPortRaw] = process.argv.slice(2);
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const proxyPort = Number.parseInt(proxyPortRaw || "", 10);
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const targetPort = Number.parseInt(targetPortRaw || "", 10);
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if (!proxyHost || !Number.isInteger(proxyPort) || !targetHost || !Number.isInteger(targetPort)) {
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console.error("hwlab git-mirror proxy-connect: invalid ProxyCommand arguments");
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process.exit(64);
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}
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let settled = false;
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let tunnelEstablished = false;
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function finish(code, message) {
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if (settled) return;
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settled = true;
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if (message) console.error("hwlab git-mirror proxy-connect: " + message);
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process.exit(code);
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}
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const socket = net.createConnection({ host: proxyHost, port: proxyPort });
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let buffer = Buffer.alloc(0);
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socket.setTimeout(15000, () => { socket.destroy(); finish(65, "timeout connecting via " + proxyHost + ":" + proxyPort + " to " + targetHost + ":" + targetPort); });
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socket.on("connect", () => socket.write("CONNECT " + targetHost + ":" + targetPort + " HTTP/1.1\r\nHost: " + targetHost + ":" + targetPort + "\r\nProxy-Connection: Keep-Alive\r\n\r\n"));
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socket.on("error", (error) => finish(tunnelEstablished ? 69 : 66, (tunnelEstablished ? "tunnel socket error: " : "tcp error connecting to proxy: ") + (error && error.message ? error.message : String(error))));
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socket.on("close", () => { if (!tunnelEstablished) finish(68, "proxy closed before CONNECT completed via " + proxyHost + ":" + proxyPort + " to " + targetHost + ":" + targetPort); else finish(0); });
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function onData(chunk) {
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buffer = Buffer.concat([buffer, chunk]);
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const headerEnd = buffer.indexOf("\r\n\r\n");
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if (headerEnd === -1 && buffer.length < 8192) return;
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if (headerEnd === -1) { socket.destroy(); finish(68, "proxy response header exceeded 8192 bytes before CONNECT status via " + proxyHost + ":" + proxyPort + " to " + targetHost + ":" + targetPort); return; }
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const head = buffer.slice(0, headerEnd + 4).toString("latin1");
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const statusLine = head.split("\r\n", 1)[0] || "";
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const statusCode = Number.parseInt(statusLine.split(" ")[1] || "", 10);
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if (!statusLine.startsWith("HTTP/1.") || !Number.isInteger(statusCode) || statusCode < 200 || statusCode > 299) {
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const safeStatus = statusLine.replace(/[^\x20-\x7e]/g, "?").slice(0, 160);
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socket.destroy();
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finish(67, "proxy CONNECT failed via " + proxyHost + ":" + proxyPort + " to " + targetHost + ":" + targetPort + ": " + safeStatus);
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return;
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}
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socket.off("data", onData);
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socket.setTimeout(0);
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tunnelEstablished = true;
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const rest = buffer.slice(headerEnd + 4);
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if (rest.length) process.stdout.write(rest);
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process.stdin.on("error", () => {});
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process.stdout.on("error", () => {});
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process.stdin.pipe(socket);
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socket.pipe(process.stdout);
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}
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socket.on("data", onData); |