shell bypass 403
#!/usr/bin/env node
var net = require('net');
var opts = require('commander');
var Throttle = require('../src/throttle.js').Throttle;
function parseAddr(addr) {
var result = /^(([^:]*):)?(\d+)$/.exec(addr);
if (!result)
return null;
return {
host: result[2],
port: result[3]
};
}
function parseInteger(s) {
if (!/^\d+$/.test(s))
return undefined;
return parseInt(s, 10);
}
function runProxy(localAddr, remoteAddr, downRate, upRate) {
var server = net.createServer(function(local) {
var remote = net.createConnection(remoteAddr);
var localThrottle = new Throttle({rate: upRate});
var remoteThrottle = new Throttle({rate: downRate});
local.pipe(localThrottle).pipe(remote);
local.on('error', function() {
remote.destroy();
local.destroy();
});
remote.pipe(remoteThrottle).pipe(local);
remote.on('error', function() {
local.destroy();
remote.destroy();
});
});
server.listen(localAddr.port, localAddr.host);
}
function main() {
var localAddr, remoteAddr, downRate, upRate;
opts
.option('-l, --localaddr <addr>', 'local address, default 0.0.0.0:8080')
.option('-r, --remoteaddr <addr>', 'remote address, default localhost:80')
.option('-d, --downstream <bps>', 'downstream bandwidth', parseInteger)
.option('-u, --upstream <bps>', 'upstream bandwidth, default equal to downstream', parseInteger)
.parse(process.argv);
if (opts.localaddr !== undefined) {
localAddr = parseAddr(opts.localaddr);
if (!localAddr)
opts.help();
} else
localAddr = {host: undefined, port: 8080};
if (opts.remoteaddr !== undefined) {
remoteAddr = parseAddr(opts.remoteaddr);
if (!remoteAddr)
opts.help();
} else
remoteAddr = {host: undefined, port: 80};
if (opts.downstream === undefined)
opts.help();
downRate = opts.downstream;
if (opts.upstream !== undefined)
upRate = opts.upstream;
else
upRate = downRate;
runProxy(localAddr, remoteAddr, downRate, upRate);
}
main();