108 DnsName findZoneName(DnsName fqdn, int rrclass, boolean recursion)
109 throws NamingException {
110
111 fqdn = (DnsName) fqdn.clone();
112 while (fqdn.size() > 1) { // while below root
113 ResourceRecords rrs = null;
114 try {
115 rrs = query(fqdn, rrclass, ResourceRecord.TYPE_SOA,
116 recursion, false);
117 } catch (NameNotFoundException e) {
118 throw e;
119 } catch (NamingException e) {
120 // Ignore error and keep searching up the tree.
121 }
122 if (rrs != null) {
123 if (rrs.answer.size() > 0) { // found zone's SOA
124 return fqdn;
125 }
126 // Look for an SOA record giving the zone's top node.
127 for (int i = 0; i < rrs.authority.size(); i++) {
128 ResourceRecord rr = (ResourceRecord)
129 rrs.authority.elementAt(i);
130 if (rr.getType() == ResourceRecord.TYPE_SOA) {
131 DnsName zone = rr.getName();
132 if (fqdn.endsWith(zone)) {
133 return zone;
134 }
135 }
136 }
137 }
138 fqdn.remove(fqdn.size() - 1); // one step rootward
139 }
140 return fqdn; // no SOA found below root, so
141 // return root
142 }
143
144 /*
145 * Finds a zone's SOA record. Returns null if no SOA is found (in
146 * which case "zone" is not actually a zone).
147 * If recursion is true, recursion is requested on the query.
148 */
149 ResourceRecord findSoa(DnsName zone, int rrclass, boolean recursion)
150 throws NamingException {
151
152 ResourceRecords rrs = query(zone, rrclass, ResourceRecord.TYPE_SOA,
153 recursion, false);
154 for (int i = 0; i < rrs.answer.size(); i++) {
155 ResourceRecord rr = (ResourceRecord) rrs.answer.elementAt(i);
156 if (rr.getType() == ResourceRecord.TYPE_SOA) {
157 return rr;
158 }
159 }
160 return null;
161 }
162
163 /*
164 * Finds the name servers of a zone. <tt>zone</tt> is a fully-qualified
165 * domain name at the top of a zone.
166 * If recursion is true, recursion is requested on the query.
167 */
168 private String[] findNameServers(DnsName zone, boolean recursion)
169 throws NamingException {
170
171 // %%% As an optimization, could look in authority section of
172 // findZoneName() response first.
173 ResourceRecords rrs =
174 query(zone, ResourceRecord.CLASS_INTERNET, ResourceRecord.TYPE_NS,
175 recursion, false);
176 String[] ns = new String[rrs.answer.size()];
177 for (int i = 0; i < ns.length; i++) {
178 ResourceRecord rr = (ResourceRecord)
179 rrs.answer.elementAt(i);
180 if (rr.getType() != ResourceRecord.TYPE_NS) {
181 throw new CommunicationException("Corrupted DNS message");
182 }
183 ns[i] = (String) rr.getRdata();
184
185 // Server name will be passed to InetAddress.getByName(), which
186 // may not be able to handle a trailing dot.
187 // assert ns[i].endsWith(".");
188 ns[i] = ns[i].substring(0, ns[i].length() - 1);
189 }
190 return ns;
191 }
192 }
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108 DnsName findZoneName(DnsName fqdn, int rrclass, boolean recursion)
109 throws NamingException {
110
111 fqdn = (DnsName) fqdn.clone();
112 while (fqdn.size() > 1) { // while below root
113 ResourceRecords rrs = null;
114 try {
115 rrs = query(fqdn, rrclass, ResourceRecord.TYPE_SOA,
116 recursion, false);
117 } catch (NameNotFoundException e) {
118 throw e;
119 } catch (NamingException e) {
120 // Ignore error and keep searching up the tree.
121 }
122 if (rrs != null) {
123 if (rrs.answer.size() > 0) { // found zone's SOA
124 return fqdn;
125 }
126 // Look for an SOA record giving the zone's top node.
127 for (int i = 0; i < rrs.authority.size(); i++) {
128 ResourceRecord rr = rrs.authority.elementAt(i);
129 if (rr.getType() == ResourceRecord.TYPE_SOA) {
130 DnsName zone = rr.getName();
131 if (fqdn.endsWith(zone)) {
132 return zone;
133 }
134 }
135 }
136 }
137 fqdn.remove(fqdn.size() - 1); // one step rootward
138 }
139 return fqdn; // no SOA found below root, so
140 // return root
141 }
142
143 /*
144 * Finds a zone's SOA record. Returns null if no SOA is found (in
145 * which case "zone" is not actually a zone).
146 * If recursion is true, recursion is requested on the query.
147 */
148 ResourceRecord findSoa(DnsName zone, int rrclass, boolean recursion)
149 throws NamingException {
150
151 ResourceRecords rrs = query(zone, rrclass, ResourceRecord.TYPE_SOA,
152 recursion, false);
153 for (int i = 0; i < rrs.answer.size(); i++) {
154 ResourceRecord rr = rrs.answer.elementAt(i);
155 if (rr.getType() == ResourceRecord.TYPE_SOA) {
156 return rr;
157 }
158 }
159 return null;
160 }
161
162 /*
163 * Finds the name servers of a zone. <tt>zone</tt> is a fully-qualified
164 * domain name at the top of a zone.
165 * If recursion is true, recursion is requested on the query.
166 */
167 private String[] findNameServers(DnsName zone, boolean recursion)
168 throws NamingException {
169
170 // %%% As an optimization, could look in authority section of
171 // findZoneName() response first.
172 ResourceRecords rrs =
173 query(zone, ResourceRecord.CLASS_INTERNET, ResourceRecord.TYPE_NS,
174 recursion, false);
175 String[] ns = new String[rrs.answer.size()];
176 for (int i = 0; i < ns.length; i++) {
177 ResourceRecord rr = rrs.answer.elementAt(i);
178 if (rr.getType() != ResourceRecord.TYPE_NS) {
179 throw new CommunicationException("Corrupted DNS message");
180 }
181 ns[i] = (String) rr.getRdata();
182
183 // Server name will be passed to InetAddress.getByName(), which
184 // may not be able to handle a trailing dot.
185 // assert ns[i].endsWith(".");
186 ns[i] = ns[i].substring(0, ns[i].length() - 1);
187 }
188 return ns;
189 }
190 }
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