Port sniffer #15
Port sniffer #15
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assmass13
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@assmass13 good job!
However your commit affects demo files added by @AMashoshyna :
- removes
submissions/amashoshyna/port-sniffer/index.js - renames
submissions/amashoshyna/port-sniffer/README.md
The above means these files will be no longer available for future contributors which is not really nice.
Please fix the issue.
assmass13
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@assmass13 thank you for updating the code base. Please avoid force pushing branches as this destroys the history. |
| exit(0); | ||
| } else if ( | ||
| args.indexOf('--host') === -1 || | ||
| !args[args.indexOf('--host') + 1] |
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What if we have
node sniffer.js --host --ports '80-90'| } | ||
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| return args.reduce((result, item, index, arr) => { | ||
| if (item.indexOf('--') === 0 && arr[index + 1]) { |
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item.indexOf('--') === 0=>
item.startsWith('--')| const parsedArgs = parseArgs(processArgs); | ||
| const address = await getAddress(parsedArgs['--host']); | ||
| const portLimits = | ||
| '--ports' in parsedArgs |
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be careful with that:
'length' in []
// true
'includes' in []
// true|
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| return args.reduce((result, item, index, arr) => { | ||
| if (item.indexOf('--') === 0 && arr[index + 1]) { | ||
| return { ...result, [item]: arr[index + 1] }; |
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maybe write to result object without useless symbols ?
{ ...result, [item.slice(2)]: arr[index + 1] }
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| function getPortLimits(portsRange) { | ||
| const arePortsValid = ports => | ||
| ports.length === 2 && |
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Its better to move it to module scope, cause this function doesn't use closure variables.
| for (let port = startPort; port < endPort; port += 1) { | ||
| openPorts.push(scanAddressPort(address, port)); | ||
| } | ||
| return Promise.all(openPorts).then(values => values.filter(Number.isFinite)); |
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Bad idea, you may get a lot opened sockets at once, which, believe me, is not what we want to have. It may consume a lot of system resources.
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Resolve it with batches or sequentially
| }); | ||
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| socket.on('timeout', () => { | ||
| resolve(false); |
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Its a bad practice to return different datatypes from one function. In this case boolean and number. Use null for that.
| async function getAddress(host) { | ||
| return new Promise((resolve, reject) => { | ||
| dns.lookup(host, (err, address) => { | ||
| if (err) reject(err); |
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| function exit(code) { | ||
| process.exit(code); | ||
| } |
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Maybe if you have helpers already you can do following ?
function writeFatal(str) {
rocess.stdout.write(str);
process.exit(1);
}
function writeSuccess(str) {
rocess.stdout.write(str);
process.exit(0);
}
| function getPortLimits(portsRange) { | ||
| const arePortsValid = ports => | ||
| ports.length === 2 && | ||
| ports[0] >= defaultPortLimits.startPort && |
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btw, ports[0] never be lower then 0 cause you got ports.split('-')
| const parsedArgs = parseArgs(processArgs); | ||
| const address = await getAddress(parsedArgs['--host']); | ||
| const portLimits = | ||
| '--ports' in parsedArgs |
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be careful with that:
'length' in []
// true
'includes' in []
// true
Port sniffer is developed.