@c8y/ngx-components
Version:
Angular modules for Cumulocity IoT applications
96 lines • 12.3 kB
JavaScript
export class TelnetNegotiator {
constructor(terminal, termType) {
this.terminal = terminal;
this.termType = termType;
}
setTermType(type) {
this.termType = type;
}
pushStr(str, arr) {
for (let i = 0; i < str.length; i++) {
arr.push(str.charCodeAt(i));
}
}
negotiate(data) {
const arrUint8 = new Uint8Array(data);
const arr = [...arrUint8.values()];
const sendQueue = [];
let stringToDisplay = '';
let chr;
let code;
let value;
while (arr.length > 0) {
chr = arr.shift();
switch (chr) {
case 255: // IAC
code = arr.shift();
value = arr.shift();
switch (code) {
case 253: // DO
if (value === 24) {
// Terminal type
sendQueue.push(255, 251, value);
}
else if (value === 31) {
// NAWS (Negotiate About Window Size)
// client answers WILL NAWS
sendQueue.push(255, 251, 31);
// client sends IAC SB NAWS 0 terminalSize.cols 0 terminalSize.rows IAC SE
sendQueue.push(255, 250, 31, 0, this.terminal.cols, 0, this.terminal.rows, 255, 240);
}
else {
// Refuse other DO requests with a WONT
sendQueue.push(255, 252, value);
}
break;
case 251: // WILL
if (value === 1) {
// Affirm echo with DO
sendQueue.push(255, 253, value);
}
else {
// Reject other WILL offers with a DONT
sendQueue.push(255, 254, value);
}
break;
case 250: // SB (subnegotiation)
if (value === 24) {
// TERM-TYPE subnegotiation
if (arr[0] === 1 && arr[1] === 255 && arr[2] === 240) {
arr.shift();
arr.shift();
arr.shift();
sendQueue.push(255, 250, 24, 0);
this.pushStr(this.termType, sendQueue);
sendQueue.push(255, 240);
}
else {
console.warn('Invalid subnegotiation received' + arr);
}
}
else {
console.warn('Ignoring SB ' + value);
}
break;
case 254: // DONT
case 252: // WONT
default:
break;
}
break;
case 242: // Data Mark (Synch)
code = arr.shift();
value = arr.shift();
break;
default: // everything else
stringToDisplay += String.fromCharCode(chr);
break;
}
}
return {
dataToSend: sendQueue.length ? new Uint8Array(sendQueue) : '',
isOutput: !!stringToDisplay.length
};
}
}
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i < str.length; i++) {\n      arr.push(str.charCodeAt(i));\n    }\n  }\n\n  negotiate(data) {\n    const arrUint8 = new Uint8Array(data);\n    const arr = [...arrUint8.values()];\n\n    const sendQueue = [];\n    let stringToDisplay = '';\n    let chr: number;\n    let code: number;\n    let value: number;\n\n    while (arr.length > 0) {\n      chr = arr.shift();\n      switch (chr) {\n        case 255: // IAC\n          code = arr.shift();\n          value = arr.shift();\n          switch (code) {\n            case 253: // DO\n              if (value === 24) {\n                // Terminal type\n                sendQueue.push(255, 251, value);\n              } else if (value === 31) {\n                // NAWS (Negotiate About Window Size)\n                // client answers WILL NAWS\n                sendQueue.push(255, 251, 31);\n                // client sends IAC SB NAWS 0 terminalSize.cols 0 terminalSize.rows IAC SE\n                sendQueue.push(\n                  255,\n                  250,\n                  31,\n                  0,\n                  this.terminal.cols,\n                  0,\n                  this.terminal.rows,\n                  255,\n                  240\n                );\n              } else {\n                // Refuse other DO requests with a WONT\n                sendQueue.push(255, 252, value);\n              }\n              break;\n            case 251: // WILL\n              if (value === 1) {\n                // Affirm echo with DO\n                sendQueue.push(255, 253, value);\n              } else {\n                // Reject other WILL offers with a DONT\n                sendQueue.push(255, 254, value);\n              }\n              break;\n            case 250: // SB (subnegotiation)\n              if (value === 24) {\n                // TERM-TYPE subnegotiation\n                if (arr[0] === 1 && arr[1] === 255 && arr[2] === 240) {\n                  arr.shift();\n                  arr.shift();\n                  arr.shift();\n                  sendQueue.push(255, 250, 24, 0);\n                  this.pushStr(this.termType, sendQueue);\n                  sendQueue.push(255, 240);\n                } else {\n                  console.warn('Invalid subnegotiation received' + arr);\n                }\n              } else {\n                console.warn('Ignoring SB ' + value);\n              }\n              break;\n            case 254: // DONT\n            case 252: // WONT\n            default:\n              break;\n          }\n          break;\n        case 242: // Data Mark (Synch)\n          code = arr.shift();\n          value = arr.shift();\n          break;\n        default: // everything else\n          stringToDisplay += String.fromCharCode(chr);\n          break;\n      }\n    }\n\n    return {\n      dataToSend: sendQueue.length ? new Uint8Array(sendQueue) : '',\n      isOutput: !!stringToDisplay.length\n    };\n  }\n}\n"]}