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Add port-sniffer by OperKH #28
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Original file line number | Diff line number | Diff line change |
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const net = require('net'); | ||
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function printFatal (message) { | ||
process.stdout.write(message); | ||
process.exit(1); | ||
} | ||
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function printSuccess (message) { | ||
process.stdout.write(message); | ||
process.exit(0); | ||
} | ||
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function getParamsFromArguments () { | ||
return process.argv | ||
.slice(2) | ||
.join(' ') | ||
.split(/\s?--/) | ||
.reduce(function (acc, str) { | ||
if (!str) return acc; | ||
const [key, value] = str.split(' '); | ||
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if (key === 'ports' && value) { | ||
acc.ports = value.split('-').map(port => parseInt(port, 10)); | ||
} else { | ||
acc[key] = value; | ||
} | ||
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return acc; | ||
}, {}); | ||
} | ||
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function validateParams (params) { | ||
if (Object.hasOwnProperty.call(params, 'help')) { | ||
printSuccessHelp(); | ||
} | ||
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if (!Object.hasOwnProperty.call(params, 'host')) { | ||
printFatal('Host is required, e.g. "--host 8.8.8.8"'); | ||
} | ||
if (!params.host) { | ||
printFatal('Host value must be provided, e.g. "--host 8.8.8.8"'); | ||
} | ||
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if (Object.hasOwnProperty.call(params, 'ports')) { | ||
if (!params.ports) { | ||
printFatal('Ports value must be provided, e.g. "--ports 300-1024"'); | ||
} | ||
if (!Array.isArray(params.ports) || params.ports.length !== 2) { | ||
printFatal('Ports format invalid, must be e.g. "--ports 300-1024"'); | ||
} | ||
const [startPort, endPort] = params.ports; | ||
if (isNaN(startPort) || startPort < 0) { | ||
printFatal('Start port format invalid'); | ||
} | ||
if (isNaN(endPort) || endPort < 0) { | ||
printFatal('End port format invalid'); | ||
} | ||
if (endPort > 65535) { | ||
printFatal('End port must be between 0-65535'); | ||
} | ||
if (startPort > endPort) { | ||
printFatal('End port must be bigger then start port'); | ||
} | ||
} | ||
} | ||
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function printSuccessHelp () { | ||
printSuccess(`NAME | ||
TCP sniffer - scans open ports on specific host. | ||
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OPTIONS | ||
--help | ||
Output a usage message and exit. | ||
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--host | ||
Set a host for scan. | ||
E.g. "--host 127.0.0.1". | ||
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--ports | ||
Set ports to scan. | ||
E.g. "--ports 300-1024". | ||
Default values: 0-65535. | ||
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EXAMPLES | ||
node sniffer.js --host localhost | ||
node sniffer.js --host localhost --ports 300-1024 | ||
`); | ||
} | ||
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function sniffConnectionAvailabilityAsync (port, host) { | ||
return new Promise(function (resolve) { | ||
const socket = new net.Socket(); | ||
socket.setTimeout(300); | ||
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socket.on('connect', function () { | ||
socket.destroy(); | ||
resolve(true); | ||
}); | ||
socket.on('timeout', function () { | ||
socket.destroy(); | ||
resolve(false); | ||
}); | ||
socket.on('error', function () { | ||
socket.destroy(); | ||
resolve(false); | ||
}); | ||
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socket.connect(port, host); | ||
}); | ||
} | ||
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async function scanAsync (host, port, portLimit, availablePorts = []) { | ||
if (port > portLimit) { | ||
return availablePorts; | ||
} | ||
const isPortOpen = await sniffConnectionAvailabilityAsync(port, host); | ||
if (isPortOpen) { | ||
process.stdout.write('.'); | ||
availablePorts.push(port); | ||
} | ||
return scanAsync(host, port + 1, portLimit, availablePorts); | ||
} | ||
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(async function () { | ||
const params = getParamsFromArguments(); | ||
validateParams(params); | ||
const { host, ports = [] } = params; | ||
const [startPort = 0, endPort = 65535] = ports; | ||
const openedPorts = await scanAsync(host, startPort, endPort); | ||
const result = openedPorts.length ? `\n${openedPorts.join(',')} ports are opened` : `\nNo open ports on host: ${host}`; | ||
printSuccess(result); | ||
})(); |
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This function has too much responsibility. Although it is called "getParamsFromArguments", it actually not only gets the parameters, but also processes them. I suggest to split it into several functions.
This might not be a case for this small program, but usually argument parsing is reused and thus should not contain any specific logic.