Пример #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);
        }
Пример #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);
        }
Пример #3
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));
        }
Пример #4
0
        public MXRecord[] ResolveDomain(string domain)
        {
            lock (sync)
            {
                MXRecord[] ret = new MXRecord[0];

                if (cache.ContainsKey(domain))
                {
                    ret = cache[domain];
                }
                else
                {
                    ret = Resolver.MXLookup(domain, s_dnsServer01);
                    cache.Add(domain, ret);
                }
                return(ret);
            }
        }