first commit, no tests or docs yet of course

.gitignore

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+node_modules

README.md

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+#IP Carefully
+
+Creates HTTP or HTTPS agents for node.js that can filter based on IP.
+Accepts whitelists or blacklists.
+
+
+```javascript
+
+const IPCarefully = require('ipcarefully');
+const https = IPCarefully.https({ type: 'blacklist', iplist: ['127.0.0.1'], agent: { maxSockets: 5 });
+
+https.get('localhost'); //Will throw an error
+```

index.js

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+'use strict';
+
+const IPRangeCheck = require('ip-range-check');
+const Http = require('http');
+const Https = require('https');
+const Dns = require('dns');
+
+class Lookup {
+
+  constructor(settings) {
+
+    assert(this.type === 'whitelist' || this.type === 'blacklist', 'type must be whitelist or blacklist');
+    this.type = settings.type;
+    this.iplist = settings.iplist;
+  },
+
+  filter(hostname, options, callback) {
+
+    if (arguments.length ===2) {
+      callback = options;
+      options = {};
+    }
+
+    Dns.lookup(hostname, options, (err, address, family) => {
+
+      if (err) {
+        callback(err);
+        return;
+      }
+
+      const ip_test = IPRangeCheck(address, this.iplist);
+
+      if (ip_test && this.type === 'whitelist') { //IP on whitelist, pass
+        callback(err, address, family);
+        return;
+      }
+      if (!ip_test && this.type === 'blacklist') { //IP not on blacklist, pass
+        callback(err, address, family);
+        return;
+      }
+      //Fail
+      callback(new Error(`Connection to IP ${address} not allowed`));
+      return;
+    });
+  }
+
+};
+
+exports.http = function (settings) {
+
+  const httpAgent = new Http.Agent(settings.agent);
+  const lookup = new (Lookup(settings));
+
+  httpAgent._oldCreateConnection_ = httpAgent.createConnection;
+  httpAgent.createConnection = function (options) {
+
+    options.lookup = lookup.filter;
+    return this._oldCreateConnection_(...arguments);
+  };
+
+  return httpAgent;
+};
+
+exports.https = function (options) {
+
+  const httpsAgent = new Https.Agent(settings.agent);
+  const lookup = new (Lookup(settings));
+
+  httpsAgent._oldCreateConnection_ = httpsAgent.createConnection;
+  httpsAgent.createConnection = function (options) {
+
+    options.lookup = lookup.filter;
+    return this._oldCreateConnection_(...arguments);
+  };
+
+  return httpsAgent;
+};

package.json

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+{
+  "name": "ipcarefully",
+  "version": "1.0.0",
+  "description": "Creates HTTP or HTTPS agents for node.js that can filter based on IP",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "ip",
+    "filter",
+    "http",
+    "https",
+    "agent"
+  ],
+  "author": "Gar <[email protected]>",
+  "license": "MIT",
+  "dependencies": {
+    "ip-range-check": "0.0.2"
+  }
+}