Exemple #1
0
        /*
         *      public static bool operator<(MXRecord record1, MXRecord record2)
         *      {
         *          if (record1._preference > record2._preference) return false;
         *          if (record1._domainName > record2._domainName) return false;
         *          return false;
         *      }
         *
         *      public static bool operator>(MXRecord record1, MXRecord record2)
         *      {
         *          if (record1._preference < record2._preference) return false;
         *          if (record1._domainName < record2._domainName) return false;
         *          return false;
         *      }
         */

        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 != _preference)
            {
                return(false);
            }

            // and so must the domain name
            if (mxOther._domainName != _domainName)
            {
                return(false);
            }

            // its a match
            return(true);
        }
Exemple #2
0
        /// <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);
        }
Exemple #3
0
		/// <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;
		}
Exemple #4
0
        /// <summary>
        /// Implements the IComparable interface so that we can sort the MX records by their
        /// lowest preference
        /// </summary>
        /// <param name="other">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 < _preference)
            {
                return(1);
            }
            if (mxOther._preference > _preference)
            {
                return(-1);
            }

            // order mail servers of same preference by name
            return(-mxOther._domainName.CompareTo(_domainName));
        }
Exemple #5
0
        /// <summary>
        ///     Construct a resource record from a pointer to a byte array
        /// </summary>
        /// <param name="pointer">the position in the byte array of the record</param>
        internal ResourceRecord(Pointer pointer)
        {
            // extract the domain, question type, question class and Ttl
            Domain = pointer.ReadDomain();
            Type   = (DnsType)pointer.ReadShort();
            Class  = (DnsClass)pointer.ReadShort();
            Ttl    = pointer.ReadInt();

            // the next short is the record length, we only use it for unrecognized record types
            int recordLength = pointer.ReadShort();

            // and create the appropriate RDATA record based on the dnsType
            switch (Type)
            {
            case DnsType.NS:
                Record = new NSRecord(pointer);
                break;

            case DnsType.MX:
                Record = new MXRecord(pointer);
                break;

            case DnsType.ANAME:
                Record = new ANameRecord(pointer);
                break;

            case DnsType.CNAME:
                Record = new CNameRecord(pointer);
                break;

            case DnsType.SOA:
                Record = new SoaRecord(pointer);
                break;

            case DnsType.TXT:
                Record = new TXTRecord(pointer, recordLength);
                break;

            default:
            {
                // move the pointer over this unrecognized record
                pointer.Seek(recordLength);
                break;
            }
            }
        }