Exemplo n.º 1
0
  /**
   * Looks up Records in the Zone. This follows CNAMEs and wildcards.
   *
   * @param name The name to look up
   * @param type The type to look up
   * @return A SetResponse object
   * @see SetResponse
   */
  public SetResponse findRecords(Name name, short type) {
    SetResponse zr = null;

    Object o = findSets(name, type);
    if (o == null) {
      /* The name does not exist */
      if (name.isWild()) return SetResponse.ofType(SetResponse.NXDOMAIN);

      int labels = name.labels() - origin.labels();
      if (labels == 0) return SetResponse.ofType(SetResponse.NXDOMAIN);
      if (hasWild) {
        SetResponse sr;
        Name tname = name;
        do {
          sr = findRecords(tname.wild(1), type);
          if (!sr.isNXDOMAIN()) return sr;
          tname = new Name(tname, 1);
        } while (labels-- >= 1);
        return sr;
      } else return SetResponse.ofType(SetResponse.NXDOMAIN);
    }

    if (o instanceof TypeMap) {
      /* The name exists but the type does not. */
      return SetResponse.ofType(SetResponse.NXRRSET);
    }

    Object[] objects;
    RRset rrset;

    if (o instanceof RRset) {
      objects = null;
      rrset = (RRset) o;
    } else {
      objects = (Object[]) o;
      rrset = (RRset) objects[0];
    }

    if (name.equals(rrset.getName())) {
      if (type != Type.CNAME && type != Type.ANY && rrset.getType() == Type.CNAME)
        zr = new SetResponse(SetResponse.CNAME, rrset);
      else if (rrset.getType() == Type.NS && !name.equals(origin))
        zr = new SetResponse(SetResponse.DELEGATION, rrset);
      else {
        zr = new SetResponse(SetResponse.SUCCESSFUL);
        zr.addRRset(rrset);
        if (objects != null) {
          for (int i = 1; i < objects.length; i++) zr.addRRset((RRset) objects[i]);
        }
      }
    } else {
      if (rrset.getType() == Type.CNAME) return SetResponse.ofType(SetResponse.NXDOMAIN);
      else if (rrset.getType() == Type.DNAME) {
        zr = new SetResponse(SetResponse.DNAME, rrset);
      } else if (rrset.getType() == Type.NS) {
        zr = new SetResponse(SetResponse.DELEGATION, rrset);
      }
    }
    return zr;
  }
Exemplo n.º 2
0
 private synchronized void addRRset(Name name, RRset rrset) {
   if (!hasWild && name.isWild()) hasWild = true;
   Object types = data.get(name);
   if (types == null) {
     data.put(name, rrset);
     return;
   }
   int rtype = rrset.getType();
   if (types instanceof List) {
     List list = (List) types;
     for (int i = 0; i < list.size(); i++) {
       RRset set = (RRset) list.get(i);
       if (set.getType() == rtype) {
         list.set(i, rrset);
         return;
       }
     }
     list.add(rrset);
   } else {
     RRset set = (RRset) types;
     if (set.getType() == rtype) data.put(name, rrset);
     else {
       LinkedList list = new LinkedList();
       list.add(set);
       list.add(rrset);
       data.put(name, list);
     }
   }
 }
Exemplo n.º 3
0
 private synchronized RRset oneRRset(Object types, int type) {
   if (type == Type.ANY) throw new IllegalArgumentException("oneRRset(ANY)");
   if (types instanceof List) {
     List list = (List) types;
     for (int i = 0; i < list.size(); i++) {
       RRset set = (RRset) list.get(i);
       if (set.getType() == type) return set;
     }
   } else {
     RRset set = (RRset) types;
     if (set.getType() == type) return set;
   }
   return null;
 }
Exemplo n.º 4
0
 /**
  * Returns an array containing all records in the given section grouped into RRsets.
  *
  * @see RRset
  * @see Section
  */
 public RRset[] getSectionRRsets(int section) {
   if (sections[section] == null) return emptyRRsetArray;
   List sets = new LinkedList();
   Record[] recs = getSectionArray(section);
   Set hash = new HashSet();
   for (int i = 0; i < recs.length; i++) {
     Name name = recs[i].getName();
     boolean newset = true;
     if (hash.contains(name)) {
       for (int j = sets.size() - 1; j >= 0; j--) {
         RRset set = (RRset) sets.get(j);
         if (set.getType() == recs[i].getRRsetType()
             && set.getDClass() == recs[i].getDClass()
             && set.getName().equals(name)) {
           set.addRR(recs[i]);
           newset = false;
           break;
         }
       }
     }
     if (newset) {
       RRset set = new RRset(recs[i]);
       sets.add(set);
       hash.add(name);
     }
   }
   return (RRset[]) sets.toArray(new RRset[sets.size()]);
 }
Exemplo n.º 5
0
 /**
  * Adds an RRset to the Cache.
  *
  * @param r The RRset to be added
  * @param cred The credibility of these records
  * @param o The source of this RRset (this could be a Message, for example)
  * @see RRset
  */
 public void addRRset(RRset rrset, byte cred) {
   Name name = rrset.getName();
   short type = rrset.getType();
   if (verifier != null) rrset.setSecurity(verifier.verify(rrset, this));
   if (secure && rrset.getSecurity() < DNSSEC.Secure) return;
   Element element = (Element) findExactSet(name, type);
   if (element == null || cred > element.credibility)
     addSet(name, type, new PositiveElement(rrset, cred));
 }
Exemplo n.º 6
0
 private synchronized void removeRRset(Name name, int type) {
   Object types = data.get(name);
   if (types == null) {
     return;
   }
   if (types instanceof List) {
     List list = (List) types;
     for (int i = 0; i < list.size(); i++) {
       RRset set = (RRset) list.get(i);
       if (set.getType() == type) {
         list.remove(i);
         if (list.size() == 0) data.remove(name);
         return;
       }
     }
   } else {
     RRset set = (RRset) types;
     if (set.getType() != type) return;
     data.remove(name);
   }
 }
Exemplo n.º 7
0
 public Object next() {
   if (sentLastSOA) return null;
   if (!sentFirstSOA) {
     sentFirstSOA = true;
     return (RRset) findExactSet(origin, Type.SOA);
   }
   if (!sentNS) {
     sentNS = true;
     return getNS();
   }
   if (!sentOrigin) {
     if (currentName == null) {
       currentName = getOrigin();
       TypeMap tm = findName(currentName);
       current = (Object[]) tm.getAll();
       count = 0;
     }
     while (count < current.length) {
       RRset rrset = (RRset) current[count];
       if (rrset.getType() != Type.SOA && rrset.getType() != Type.NS) return current[count++];
       count++;
     }
     current = null;
     sentOrigin = true;
   }
   if (current != null && count < current.length) return current[count++];
   while (znames.hasNext()) {
     Name currentName = (Name) znames.next();
     if (currentName.equals(getOrigin())) continue;
     TypeMap tm = findName(currentName);
     current = (Object[]) tm.getAll();
     count = 0;
     if (count < current.length) return current[count++];
   }
   sentLastSOA = true;
   RRset rrset = new RRset();
   rrset.addRR(getSOA());
   return rrset;
 }
Exemplo n.º 8
0
  private void verifyRecords(Cache tcache) {
    Iterator it;

    it = tcache.names();
    while (it.hasNext()) {
      Name name = (Name) it.next();
      Object[] elements = findExactSets(name);
      for (int i = 0; i < elements.length; i++) {
        Element element = (Element) elements[i];
        if (element instanceof PositiveElement) continue;
        RRset rrset = ((PositiveElement) element).rrset;

        /* for now, ignore negative cache entries */
        if (rrset == null) continue;
        if (verifier != null) rrset.setSecurity(verifier.verify(rrset, this));
        if (rrset.getSecurity() < DNSSEC.Secure) continue;
        addSet(name, rrset.getType(), element);
      }
    }
  }
Exemplo n.º 9
0
 public short getType() {
   return rrset.getType();
 }
Exemplo n.º 10
0
  /**
   * Looks up Records in the Cache. This follows CNAMEs and handles negatively cached data.
   *
   * @param name The name to look up
   * @param type The type to look up
   * @param minCred The minimum acceptable credibility
   * @return A SetResponse object
   * @see SetResponse
   * @see Credibility
   */
  public SetResponse lookupRecords(Name name, short type, byte minCred) {
    SetResponse cr = null;
    boolean verbose = Options.check("verbosecache");
    Object o = lookup(name, type);

    if (verbose) logLookup(name, type, "Starting");

    if (o == null || o == NXRRSET) {
      /*
       * The name exists, but the type was not found.  Or, the
       * name does not exist and no parent does either.  Punt.
       */
      if (verbose) logLookup(name, type, "no information found");
      return SetResponse.ofType(SetResponse.UNKNOWN);
    }

    Object[] objects;
    if (o instanceof Element) objects = new Object[] {o};
    else objects = (Object[]) o;

    int nelements = 0;
    for (int i = 0; i < objects.length; i++) {
      Element element = (Element) objects[i];
      if (element.expired()) {
        if (verbose) {
          logLookup(name, type, element.toString());
          logLookup(name, type, "expired: ignoring");
        }
        removeSet(name, type, element);
        objects[i] = null;
      } else if (element.credibility < minCred) {
        if (verbose) {
          logLookup(name, type, element.toString());
          logLookup(name, type, "not credible: ignoring");
        }
        objects[i] = null;
      } else {
        nelements++;
      }
    }
    if (nelements == 0) {
      /* We have data, but can't use it.  Punt. */
      if (verbose) logLookup(name, type, "no useful data found");
      return SetResponse.ofType(SetResponse.UNKNOWN);
    }

    /*
     * We have something at the name.  It could be the answer,
     * a CNAME, DNAME, or NS, or a negative cache entry.
     *
     * Ignore wildcards, since it's pretty unlikely that any will be
     * cached.  The occasional extra query is easily balanced by the
     * reduced number of lookups.
     */

    for (int i = 0; i < objects.length; i++) {
      if (objects[i] == null) continue;
      Element element = (Element) objects[i];
      if (verbose) logLookup(name, type, element.toString());
      RRset rrset = null;
      if (element instanceof PositiveElement) rrset = ((PositiveElement) element).rrset;

      /* Is this a negatively cached entry? */
      if (rrset == null) {
        /*
         * If this is an NXDOMAIN entry, return NXDOMAIN.
         */
        if (element.getType() == 0) {
          if (verbose) logLookup(name, type, "NXDOMAIN");
          return SetResponse.ofType(SetResponse.NXDOMAIN);
        }

        /*
         * If we're not looking for type ANY, return NXRRSET.
         * Otherwise ignore this.
         */
        if (type != Type.ANY) {
          if (verbose) logLookup(name, type, "NXRRSET");
          return SetResponse.ofType(SetResponse.NXRRSET);
        } else {
          if (verbose) logLookup(name, type, "ANY query; " + "ignoring NXRRSET");
          continue;
        }
      }

      short rtype = rrset.getType();
      Name rname = rrset.getName();
      if (name.equals(rname)) {
        if (type != Type.CNAME && type != Type.ANY && rtype == Type.CNAME) {
          if (verbose) logLookup(name, type, "cname");
          return new SetResponse(SetResponse.CNAME, rrset);
        } else if (type != Type.NS && type != Type.ANY && rtype == Type.NS) {
          if (verbose) logLookup(name, type, "exact delegation");
          return new SetResponse(SetResponse.DELEGATION, rrset);
        } else {
          if (verbose) logLookup(name, type, "exact match");
          if (cr == null) cr = new SetResponse(SetResponse.SUCCESSFUL);
          cr.addRRset(rrset);
        }
      } else if (name.subdomain(rname)) {
        if (rtype == Type.DNAME) {
          if (verbose) logLookup(name, type, "dname");
          return new SetResponse(SetResponse.DNAME, rrset);
        } else if (rtype == Type.NS) {
          if (verbose) logLookup(name, type, "parent delegation");
          return new SetResponse(SetResponse.DELEGATION, rrset);
        } else {
          if (verbose)
            logLookup(name, type, "ignoring rrset (" + rname + " " + Type.string(rtype) + ")");
        }
      } else {
        if (verbose)
          logLookup(name, type, "ignoring rrset (" + rname + " " + Type.string(rtype) + ")");
      }
    }

    /*
     * As far as I can tell, the only legitimate time cr will be null is
     * if we queried for ANY and only saw negative responses, but not an
     * NXDOMAIN.  Return UNKNOWN.
     */
    if (cr == null && type == Type.ANY) return SetResponse.ofType(SetResponse.UNKNOWN);
    else if (cr == null)
      throw new IllegalStateException(
          "looking up (" + name + " " + Type.string(type) + "): " + "cr == null.");
    return cr;
  }