public override bool Equals(object obj) { // this object isn't null if (obj == null) { return(false); } // must be of same type if (this.GetType() != obj.GetType()) { return(false); } MXRecord mxOther = (MXRecord)obj; // preference must match if (mxOther._preference != this._preference) { return(false); } // and so must the domain name if (mxOther._domainName != this._domainName) { return(false); } // its a match return(true); }
/// <summary> /// Shorthand form to make MX querying easier, essentially wraps up the retreival /// of the MX records, and sorts them by preference /// </summary> /// <param name="domain"> domain name to retreive MX RRs for </param> /// <param name="dnsServer"> the server we're going to ask </param> /// <returns> An array of MXRecords </returns> public static MXRecord[] MXLookup(string domain, IPAddress dnsServer) { // check the inputs if (domain == null) { throw new ArgumentNullException("domain"); } if (dnsServer == null) { throw new ArgumentNullException("dnsServer"); } // create a request for this Request request = new Request(); // add one question - the MX IN lookup for the supplied domain request.AddQuestion(new Question(domain, DnsType.MX, DnsClass.IN)); // fire it off Response response = Lookup(request, dnsServer); // if we didn't get a response, then return null if (response == null) { return(null); } // create a growable array of MX records ArrayList resourceRecords = new ArrayList(); // add each of the answers to the array foreach (Answer answer in response.Answers) { // if the answer is an MX record if (answer.Record.GetType() == typeof(MXRecord)) { // add it to our array resourceRecords.Add(answer.Record); } } // create array of MX records MXRecord[] mxRecords = new MXRecord[resourceRecords.Count]; // copy from the array list resourceRecords.CopyTo(mxRecords); // sort into lowest preference order Array.Sort(mxRecords); // and return return(mxRecords); }
/// <summary> /// Implements the IComparable interface so that we can sort the MX records by their /// lowest preference /// </summary> /// <param name="obj"> the other MxRecord to compare against </param> /// <returns> 1, 0, -1 </returns> public int CompareTo(object obj) { MXRecord mxOther = (MXRecord)obj; // we want to be able to sort them by preference if (mxOther._preference < this._preference) { return(1); } if (mxOther._preference > this._preference) { return(-1); } // order mail servers of same preference by name return(-mxOther._domainName.CompareTo(this._domainName)); }
/// <summary> /// Shorthand form to make MX querying easier, essentially wraps up the retreival /// of the MX records, and sorts them by preference /// </summary> /// <param name="domain"> domain name to retreive MX RRs for </param> /// <param name="dnsServer"> the server we're going to ask </param> /// <returns> An array of MXRecords </returns> public static MXRecord[] MXLookup(string domain, IPAddress dnsServer) { // check the inputs if (domain == null) throw new ArgumentNullException("domain"); if (dnsServer == null) throw new ArgumentNullException("dnsServer"); // create a request for this Request request = new Request(); // add one question - the MX IN lookup for the supplied domain request.AddQuestion(new Question(domain, DnsType.MX, DnsClass.IN)); // fire it off Response response = Lookup(request, dnsServer); // if we didn't get a response, then return null if (response == null) return null; // create a growable array of MX records ArrayList resourceRecords = new ArrayList(); // add each of the answers to the array foreach (Answer answer in response.Answers) { // if the answer is an MX record if (answer.Record.GetType() == typeof (MXRecord)) { // add it to our array resourceRecords.Add(answer.Record); } } // create array of MX records MXRecord[] mxRecords = new MXRecord[resourceRecords.Count]; // copy from the array list resourceRecords.CopyTo(mxRecords); // sort into lowest preference order Array.Sort(mxRecords); // and return return mxRecords; }