1 | "use strict";
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2 |
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3 | const net = require("net");
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4 | const os = require("os");
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5 | const execa = require("execa");
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6 |
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7 | const args = {
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8 | v4: ["-4", "r"],
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9 | v6: ["-6", "r"],
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10 | };
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11 |
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12 | const parse = (stdout, family) => {
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13 | let result;
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14 |
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15 | (stdout || "").trim().split("\n").some(line => {
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16 | const results = /default( via .+?)?( dev .+?)( |$)/.exec(line) || [];
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17 | const gateway = (results[1] || "").substring(5);
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18 | const iface = (results[2] || "").substring(5);
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19 | if (gateway && net.isIP(gateway)) {
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20 | result = {gateway, interface: (iface ? iface : null)};
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21 | return true;
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22 | } else if (iface && !gateway) {
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23 | const interfaces = os.networkInterfaces();
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24 | const addresses = interfaces[iface];
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25 | if (!addresses || !addresses.length) return;
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26 |
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27 | addresses.some(addr => {
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28 | if (addr.family.substring(2) === family && net.isIP(addr.address)) {
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29 | result = {gateway: addr.address, interface: (iface ? iface : null)};
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30 | return true;
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31 | }
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32 | });
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33 | }
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34 | });
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35 |
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36 | if (!result) {
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37 | throw new Error("Unable to determine default gateway");
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38 | }
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39 |
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40 | return result;
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41 | };
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42 |
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43 | const promise = family => {
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44 | return execa.stdout("ip", args[family]).then(stdout => {
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45 | return parse(stdout, family);
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46 | });
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47 | };
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48 |
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49 | const sync = family => {
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50 | const result = execa.sync("ip", args[family]);
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51 | return parse(result.stdout, family);
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52 | };
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53 |
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54 | module.exports.v4 = () => promise("v4");
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55 | module.exports.v6 = () => promise("v6");
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56 |
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57 | module.exports.v4.sync = () => sync("v4");
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58 | module.exports.v6.sync = () => sync("v6");
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