Examples with Name org.xbill.DNS.Name used on opensource projects

Example 11 with Name

use of org.xbill.DNS.Name in project GNS by MobilityFirst.

the class NameResolution method getARecordsFromAField.

/**
   * retrieve all A records from A field of a JSON object
   * 
   * @return
   */
private static JSONArray getARecordsFromAField(JSONObject fieldResponseJson, String nameToResolve) {
    JSONArray aList = new JSONArray();
    /**
       * Format of A record in GNS:
       * {
       * 	"A":
       * 		{
       * 			"record": String[ip1, ip2, ...],
       * 			"ttl": int
       * 		}
       * }
       */
    if (fieldResponseJson.has("A")) {
        JSONArray records = null;
        int ttl = 60;
        try {
            JSONObject recordObj = fieldResponseJson.getJSONObject("A");
            records = recordObj.getJSONArray(ManagedDNSServiceProxy.RECORD_FIELD);
            ttl = recordObj.getInt(ManagedDNSServiceProxy.TTL_FIELD);
        } catch (JSONException e) {
            // something is wrong with the JSON object, return null
            e.printStackTrace();
            return null;
        }
        // The records may contain multiple ip addresses
        for (int i = 0; i < records.length(); i++) {
            try {
                String ip = records.getString(i);
                ARecord gnsARecord = new ARecord(new Name(nameToResolve), DClass.IN, ttl, InetAddress.getByName(ip));
                aList.put(gnsARecord);
            } catch (JSONException | TextParseException | UnknownHostException e) {
                // do nothing, just trash this record
                e.printStackTrace();
            }
        }
    } else {
        // there is no A record in the original GNS record, so return null
        return null;
    }
    return aList;
}

Example 12 with Name

use of org.xbill.DNS.Name in project GNS by MobilityFirst.

the class NameResolution method lookupDnsCache.

/**
   * Look up the local dns server cache.
   * Returns a {@link Message}.
   *
   * @param query
   * @param dnsCache
   * @return a Message
   */
public static Message lookupDnsCache(Message query, Cache dnsCache) {
    // check for queries we can't handle
    int type = query.getQuestion().getType();
    // Was the query legitimate or implemented?
    if (!Type.isRR(type) && type != Type.ANY) {
        return errorMessage(query, Rcode.NOTIMP);
    }
    // extract the domain (guid) and field from the query
    final Name requestedName = query.getQuestion().getName();
    final byte[] rawName = requestedName.toWire();
    final String lookupName = querytoStringForGNS(rawName);
    NameResolution.getLogger().log(Level.FINER, "Looking up name in cache: {0}", lookupName);
    SetResponse lookupresult = dnsCache.lookupRecords(requestedName, Type.ANY, Credibility.NORMAL);
    if (lookupresult.isSuccessful()) {
        Message response = new Message(query.getHeader().getID());
        response.getHeader().setFlag(Flags.QR);
        if (query.getHeader().getFlag(Flags.RD)) {
            response.getHeader().setFlag(Flags.RA);
        }
        response.addRecord(query.getQuestion(), Section.QUESTION);
        response.getHeader().setFlag(Flags.AA);
        ArrayList<Name> cnameNames = new ArrayList<>();
        // Write the response
        for (RRset rrset : lookupresult.answers()) {
            NameResolution.getLogger().log(Level.FINE, "{0}\n", rrset.toString());
            Iterator<?> rrItr = rrset.rrs();
            while (rrItr.hasNext()) {
                Record curRecord = (Record) rrItr.next();
                response.addRecord(curRecord, Section.ANSWER);
                if (curRecord.getType() == Type.CNAME) {
                    cnameNames.add(((CNAMERecord) curRecord).getAlias());
                }
            }
        }
        if (cnameNames.isEmpty()) {
            return response;
        }
        // For all CNAMES in the response, add their A records
        for (Name cname : cnameNames) {
            NameResolution.getLogger().log(Level.FINE, "Looking up CNAME in cache: {0}", cname.toString());
            SetResponse lookUpResult = dnsCache.lookupRecords(cname, Type.ANY, Credibility.NORMAL);
            if (lookUpResult.isSuccessful()) {
                for (RRset rrset : lookUpResult.answers()) {
                    NameResolution.getLogger().log(Level.FINE, "{0}\n", rrset.toString());
                    Iterator<?> rrItr = rrset.rrs();
                    while (rrItr.hasNext()) {
                        Record curRecord = (Record) rrItr.next();
                        response.addRecord(curRecord, Section.ANSWER);
                    }
                }
            }
        }
        return response;
    } else {
        return errorMessage(query, Rcode.NOTIMP);
    }
}

Example 13 with Name

use of org.xbill.DNS.Name in project GNS by MobilityFirst.

the class NameResolution method getMXRecordsFromMXField.

/**
   * retrieve MX record from MX field of a JSON object
   * the key "MX" contains a list of all MX records
   * the key "A" contains a list of all A records, which must be put into ADDITIONAL section
   * 
   * @return
   */
private static JSONObject getMXRecordsFromMXField(JSONObject fieldResponseJson, String nameToResolve) {
    JSONObject obj = new JSONObject();
    JSONArray mxList = new JSONArray();
    JSONArray aList = new JSONArray();
    if (fieldResponseJson.has("MX")) {
        JSONArray records = null;
        int ttl = 3600;
        try {
            JSONObject mxname = fieldResponseJson.getJSONObject("MX");
            records = mxname.getJSONArray(ManagedDNSServiceProxy.RECORD_FIELD);
            ttl = mxname.getInt(ManagedDNSServiceProxy.TTL_FIELD);
        } catch (JSONException e) {
            // something is wrong with the JSON object, return null
            e.printStackTrace();
            return null;
        }
        NameResolution.getLogger().log(Level.FINE, "Get MX records list: {0}", records.toString());
        // The records may contain multiple NS records
        for (int i = 0; i < records.length(); i++) {
            try {
                JSONArray record = records.getJSONArray(i);
                String pString = record.getString(0);
                int priority = Integer.parseInt(pString);
                String host = record.getString(1);
                // the host must be an absolute name, i.e., ended with a dot
                if (!host.endsWith(".")) {
                    host = host + ".";
                }
                MXRecord mxRecord = new MXRecord(new Name(nameToResolve), DClass.IN, ttl, priority, new Name(host));
                mxList.put(mxRecord);
                if (record.length() == 3) {
                    String address = record.getString(2);
                    ARecord mxARecord = new ARecord(new Name(host), DClass.IN, ttl, InetAddress.getByName(address));
                    aList.put(mxARecord);
                } else {
                // no IP address in the record for the mail server
                }
            } catch (JSONException | TextParseException | UnknownHostException e) {
                // trash this record
                e.printStackTrace();
            }
        }
    }
    try {
        obj.put("MX", mxList);
        obj.put("A", aList);
    } catch (JSONException e) {
        // return a null if JSON operation fails
        return null;
    }
    return obj;
}

Example 14 with Name

use of org.xbill.DNS.Name in project GNS by MobilityFirst.

the class NameResolution method getNSRecordsFromNSField.

/**
   * retrieve all NS records and the corresponding A records from NS field of a JSON object.
   * the key "NS" contains a list of all NS records
   * the key "A" contains a list of all A records, which must be put into ADDITIONAL section
   * 
   */
private static JSONObject getNSRecordsFromNSField(JSONObject fieldResponseJson, String nameToResolve) {
    JSONObject obj = new JSONObject();
    JSONArray aList = new JSONArray();
    JSONArray nsList = new JSONArray();
    /**
       * Format of NS record in GNS:
       * {
       * 	"NS":
       * 		{
       * 			"record":[(ns1, addr1), (ns2, addr2), ...],
       * 			"ttl":int
       * 		}
       * }
       * 
       */
    if (fieldResponseJson.has("NS")) {
        JSONArray records = null;
        int ttl = 3600;
        try {
            JSONObject recordObj = fieldResponseJson.getJSONObject("NS");
            records = recordObj.getJSONArray(ManagedDNSServiceProxy.RECORD_FIELD);
            ttl = recordObj.getInt(ManagedDNSServiceProxy.TTL_FIELD);
        } catch (JSONException e) {
            // something is wrong with the JSON object, return null
            e.printStackTrace();
            return null;
        }
        // The records may contain multiple NS records
        for (int i = 0; i < records.length(); i++) {
            try {
                JSONArray record = records.getJSONArray(i);
                String ns = record.getString(0);
                // It must be an absolute name, i.e., the string must be ended  with a dot, e.g., example.com.
                if (!ns.endsWith(".")) {
                    ns = ns + ".";
                }
                NSRecord nsRecord = new NSRecord(new Name(nameToResolve), DClass.IN, ttl, new Name(ns));
                nsList.put(nsRecord);
                // address can be null as the domain name might use other service as its name server
                if (record.length() == 2) {
                    String address = record.getString(1);
                    ARecord nsARecord = new ARecord(new Name(ns), DClass.IN, ttl, InetAddress.getByName(address));
                    aList.put(nsARecord);
                } else {
                // no IP address in the record for the name server
                }
            } catch (JSONException | TextParseException | UnknownHostException e) {
                // do nothing and trash this record
                e.printStackTrace();
            }
        }
    } else {
    // No NS record, return null
    }
    try {
        obj.put("NS", nsList);
        obj.put("A", aList);
    } catch (JSONException e) {
        // return a null if JSON operation fails
        return null;
    }
    return obj;
}

Example 15 with Name

use of org.xbill.DNS.Name in project opennms by OpenNMS.

the class DNSServer method addTSIG.

public void addTSIG(final String algstr, final String namestr, final String key) throws IOException {
    final Name name = Name.fromString(namestr, Name.root);
    m_TSIGs.put(name, new TSIG(algstr, namestr, key));
}