K0RB4K/ctf10k-rpn
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K0RB4K 2022-10-22 13:46:37 +02:00
parent c73d4db733
commit 553d93f38a
7 changed files with 0 additions and 102 deletions
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5
.idea/.gitignore vendored
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# Default ignored files
/shelf/
/workspace.xml
# Editor-based HTTP Client requests
/httpRequests/

12
.idea/ctf10k-rpn.iml
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<?xml version="1.0" encoding="UTF-8"?>
<module type="WEB_MODULE" version="4">
<component name="NewModuleRootManager">
<content url="file://$MODULE_DIR$">
<excludeFolder url="file://$MODULE_DIR$/temp" />
<excludeFolder url="file://$MODULE_DIR$/.tmp" />
<excludeFolder url="file://$MODULE_DIR$/tmp" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>

6
.idea/jsLibraryMappings.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="JavaScriptLibraryMappings">
<includedPredefinedLibrary name="Node.js Core" />
</component>
</project>

8
.idea/modules.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ProjectModuleManager">
<modules>
<module fileurl="file://$PROJECT_DIR$/.idea/ctf10k-rpn.iml" filepath="$PROJECT_DIR$/.idea/ctf10k-rpn.iml" />
</modules>
</component>
</project>

6
.idea/vcs.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$" vcs="Git" />
</component>
</project>

59
main.js
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const Net = require('net');
const port = 8002
const host = "ctf10k.root-me.org"
const client = new Net.Socket
client.on('data', (data) => {
console.log("received data:\n", data.toString())
regex =/(?<equation>^\d+.*$)/m
let message = regex.exec(data.toString()).groups["equation"]
console.log("equation:", message)
let response = interpretRPN(message)
console.log("response:", response)
let buf = Buffer.from(response+"\n")
client.write(buf)
})
client.on('end', () => {
console.log("connection terminated by remote host")
})
client.connect({port: port, host: host}, () => {
console.log("connected")
})
function interpretRPN(message){
const operators = ['-', '+', 'x', '/']
let elements = message.split(' ')
for (let i = 0; i < elements.length; i++) {
if (operators.includes(elements[i])) {
let operation = elements.slice(i-2, i+1)
let result = computeOperation(operation)
elements.splice(i-2, 3, result)
i = 0
}
}
return elements.toString()
}
function computeOperation(operation) {
switch (operation[2]) {
case '-':
return BigInt(operation[0]) - BigInt(operation[1])
case 'x':
return BigInt(operation[0]) * BigInt(operation[1])
case '/':
return BigInt(operation[0]) / BigInt(operation[1])
case '+':
return BigInt(operation[0]) + BigInt(operation[1])
}
}
// const example = "994 611 + 357 733 + 82 543 - x x 740 + 136 x 996 +"
// console.log("response:", interpretRPN(example))

6
package.json
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{
"name": "ctf10k-rpn",
"version": "1.0.0",
"dependencies": {
}
}