add hw2

node_modules/pac-resolver/dist/isInNet.js

@@ -0,0 +1,42 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const netmask_1 = require("netmask");
+const util_1 = require("./util");
+/**
+ * True iff the IP address of the host matches the specified IP address pattern.
+ *
+ * Pattern and mask specification is done the same way as for SOCKS configuration.
+ *
+ * Examples:
+ *
+ * ``` js
+ * isInNet(host, "198.95.249.79", "255.255.255.255")
+ *   // is true iff the IP address of host matches exactly 198.95.249.79.
+ *
+ * isInNet(host, "198.95.0.0", "255.255.0.0")
+ *   // is true iff the IP address of the host matches 198.95.*.*.
+ * ```
+ *
+ * @param {String} host a DNS hostname, or IP address. If a hostname is passed,
+ *   it will be resoved into an IP address by this function.
+ * @param {String} pattern an IP address pattern in the dot-separated format mask.
+ * @param {String} mask for the IP address pattern informing which parts of the
+ *   IP address should be matched against. 0 means ignore, 255 means match.
+ * @return {Boolean}
+ */
+async function isInNet(host, pattern, mask) {
+    const family = 4;
+    try {
+        const ip = await (0, util_1.dnsLookup)(host, { family });
+        if (typeof ip === 'string') {
+            const netmask = new netmask_1.Netmask(pattern, mask);
+            return netmask.contains(ip);
+        }
+    }
+    catch (err) {
+        // ignore
+    }
+    return false;
+}
+exports.default = isInNet;
+//# sourceMappingURL=isInNet.js.map