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import java.net.*;

import java.io.*;

import java.util.*;

import org.xbill.DNS.*;

/** @author Brian Wellington <[email protected]> */

public class update {

Message query, response;

Resolver res;

String server = null;

Name zone = Name.root;

long defaultTTL;

int defaultClass = DClass.IN;

PrintStream log = null;

void

print(Object o) {

System.out.println(o);

if (log != null)

log.println(o);

}

public Message

newMessage() {

Message msg = new Message();

msg.getHeader().setOpcode(Opcode.UPDATE);

return msg;

}

public

update(InputStream in) throws IOException {

List inputs = new LinkedList();

List istreams = new LinkedList();

query = newMessage();

InputStreamReader isr = new InputStreamReader(in);

BufferedReader br = new BufferedReader(isr);

inputs.add(br);

istreams.add(in);

while (true) {

try {

String line = null;

do {

InputStream is;

is = (InputStream)istreams.get(0);

br = (BufferedReader)inputs.get(0);

if (is == System.in)

System.out.print("> ");

line = br.readLine();

if (line == null) {

br.close();

inputs.remove(0);

istreams.remove(0);

if (inputs.isEmpty())

return;

}

} while (line == null);

if (log != null)

log.println("> " + line);

if (line.length() == 0 || line.charAt(0) == '#')

continue;

/* Allows cut and paste from other update sessions */

if (line.charAt(0) == '>')

line = line.substring(1);

Tokenizer st = new Tokenizer(line);

Tokenizer.Token token = st.get();

if (token.isEOL())

continue;

String operation = token.value;

if (operation.equals("server")) {

server = st.getString();

res = new SimpleResolver(server);

token = st.get();

if (token.isString()) {

String portstr = token.value;

res.setPort(Short.parseShort(portstr));

}

else if (operation.equals("key")) {

String keyname = st.getString();

String keydata = st.getString();

if (res == null)

res = new SimpleResolver(server);

res.setTSIGKey(new TSIG(keyname, keydata));

}

else if (operation.equals("edns")) {

if (res == null)

res = new SimpleResolver(server);

res.setEDNS(st.getUInt16());

}

else if (operation.equals("port")) {

if (res == null)

res = new SimpleResolver(server);

res.setPort(st.getUInt16());

}

else if (operation.equals("tcp")) {

if (res == null)

res = new SimpleResolver(server);

res.setTCP(true);

}

else if (operation.equals("class")) {

String classStr = st.getString();

int newClass = DClass.value(classStr);

if (newClass > 0)

defaultClass = newClass;

else

print("Invalid class " + classStr);

}

else if (operation.equals("ttl"))

defaultTTL = st.getTTL();

else if (operation.equals("origin") ||

operation.equals("zone"))

{

zone = st.getName(Name.root);

}

else if (operation.equals("require"))

doRequire(st);

else if (operation.equals("prohibit"))

doProhibit(st);

else if (operation.equals("add"))

doAdd(st);

else if (operation.equals("delete"))

doDelete(st);

else if (operation.equals("glue"))

doGlue(st);

else if (operation.equals("help") ||

operation.equals("?"))

{

token = st.get();

if (token.isString())

help(token.value);

else

help(null);

}

else if (operation.equals("echo"))

print(line.substring(4).trim());

else if (operation.equals("send")) {

sendUpdate();

query = newMessage();

}

else if (operation.equals("show")) {

print(query);

}

else if (operation.equals("clear"))

query = newMessage();

else if (operation.equals("query"))

doQuery(st);

else if (operation.equals("quit") ||

operation.equals("q"))

{

if (log != null)

log.close();

Iterator it = inputs.iterator();

while (it.hasNext()) {

BufferedReader tbr;

tbr = (BufferedReader) it.next();

tbr.close();

}

System.exit(0);

}

else if (operation.equals("file"))

doFile(st, inputs, istreams);

else if (operation.equals("log"))

doLog(st);

else if (operation.equals("assert")) {

if (doAssert(st) == false)

return;

}

else if (operation.equals("sleep")) {

long interval = st.getUInt32();

try {

Thread.sleep(interval);

}

catch (InterruptedException e) {

}

else if (operation.equals("date")) {

Date now = new Date();

token = st.get();

if (token.isString() &&

token.value.equals("-ms"))

print(Long.toString(now.getTime()));

else

print(now);

}

else

print("invalid keyword: " + operation);

}

catch (TextParseException tpe) {

System.out.println(tpe.getMessage());

}

catch (InterruptedIOException iioe) {

System.out.println("Operation timed out");

}

catch (SocketException se) {

System.out.println("Socket error");

}

catch (IOException ioe) {

System.out.println(ioe);

}

void

sendUpdate() throws IOException {

if (query.getHeader().getCount(Section.UPDATE) == 0) {

print("Empty update message. Ignoring.");

return;

}

if (query.getHeader().getCount(Section.ZONE) == 0) {

Name updzone;

updzone = zone;

int dclass = defaultClass;

if (updzone == null) {

Record [] recs = query.getSectionArray(Section.UPDATE);

for (int i = 0; i < recs.length; i++) {

if (updzone == null)

updzone = new Name(recs[i].getName(),

1);

if (recs[i].getDClass() != DClass.NONE &&

recs[i].getDClass() != DClass.ANY)

{

dclass = recs[i].getDClass();

break;

}

Record soa = Record.newRecord(updzone, Type.SOA, dclass);

query.addRecord(soa, Section.ZONE);

}

if (res == null)

res = new SimpleResolver(server);

response = res.send(query);

print(response);

}

* <name> [ttl] [class] <type> <data>

* Ignore the class, if present.

Record

parseRR(Tokenizer st, int classValue, long TTLValue)

throws IOException

{

Name name = st.getName(zone);

long ttl;

int type;

Record record;

String s = st.getString();

try {

ttl = TTL.parseTTL(s);

s = st.getString();

}

catch (NumberFormatException e) {

ttl = TTLValue;

}

if (DClass.value(s) >= 0) {

classValue = DClass.value(s);

s = st.getString();

}

if ((type = Type.value(s)) < 0)

throw new IOException("Invalid type: " + s);

record = Record.fromString(name, type, classValue, ttl, st, zone);

if (record != null)

return (record);

else

throw new IOException("Parse error");

}

void

doRequire(Tokenizer st) throws IOException {

Tokenizer.Token token;

Name name;

Record record;

int type;

name = st.getName(zone);

token = st.get();

if (token.isString()) {

if ((type = Type.value(token.value)) < 0)

throw new IOException("Invalid type: " + token.value);

token = st.get();

boolean iseol = token.isEOL();

st.unget();

if (!iseol) {

record = Record.fromString(name, type, defaultClass,

0, st, zone);

} else

record = Record.newRecord(name, type,

DClass.ANY, 0);

} else

record = Record.newRecord(name, Type.ANY, DClass.ANY, 0);

query.addRecord(record, Section.PREREQ);

print(record);

}

void

doProhibit(Tokenizer st) throws IOException {

Tokenizer.Token token;

Name name;

Record record;

int type;

name = st.getName(zone);

token = st.get();

if (token.isString()) {

if ((type = Type.value(token.value)) < 0)

throw new IOException("Invalid type: " + token.value);

} else

type = Type.ANY;

record = Record.newRecord(name, type, DClass.NONE, 0);

query.addRecord(record, Section.PREREQ);

print(record);

}

void

doAdd(Tokenizer st) throws IOException {

Record record = parseRR(st, defaultClass, defaultTTL);

query.addRecord(record, Section.UPDATE);

print(record);

}

void

doDelete(Tokenizer st) throws IOException {

Tokenizer.Token token;

String s;

Name name;

Record record;

int type;

name = st.getName(zone);

token = st.get();

if (token.isString()) {

s = token.value;

if (DClass.value(s) >= 0) {

s = st.getString();

}

if ((type = Type.value(s)) < 0)

throw new IOException("Invalid type: " + s);

token = st.get();

boolean iseol = token.isEOL();

st.unget();

if (!iseol) {

record = Record.fromString(name, type, DClass.NONE,

0, st, zone);

} else

record = Record.newRecord(name, type, DClass.ANY, 0);

}

else

record = Record.newRecord(name, Type.ANY, DClass.ANY, 0);

query.addRecord(record, Section.UPDATE);

print(record);

}

void

doGlue(Tokenizer st) throws IOException {

Record record = parseRR(st, defaultClass, defaultTTL);

query.addRecord(record, Section.ADDITIONAL);

print(record);

}

void

doQuery(Tokenizer st) throws IOException {

Record rec;

Tokenizer.Token token;

Name name = null;

int type = Type.A;

int dclass = defaultClass;

name = st.getName(zone);

token = st.get();

if (token.isString()) {

type = Type.value(token.value);

if (type < 0)

throw new IOException("Invalid type");

token = st.get();

if (token.isString()) {

dclass = DClass.value(token.value);

if (dclass < 0)

throw new IOException("Invalid class");

}

rec = Record.newRecord(name, type, dclass);

Message newQuery = Message.newQuery(rec);

if (res == null)

res = new SimpleResolver(server);

response = res.send(newQuery);

print(response);

}

void

doFile(Tokenizer st, List inputs, List istreams) throws IOException {

String s = st.getString();

InputStream is;

try {

if (s.equals("-"))

is = System.in;

else

is = new FileInputStream(s);

istreams.add(0, is);

inputs.add(0, new BufferedReader(new InputStreamReader(is)));

}

catch (FileNotFoundException e) {

print(s + " not found");

}

void

doLog(Tokenizer st) throws IOException {

String s = st.getString();

try {

FileOutputStream fos = new FileOutputStream(s);

log = new PrintStream(fos);

}

catch (Exception e) {

print("Error opening " + s);

}

boolean

doAssert(Tokenizer st) throws IOException {

String field = st.getString();

String expected = st.getString();

String value = null;

boolean flag = true;

int section;

if (response == null) {

print("No response has been received");

return true;

}

if (field.equalsIgnoreCase("rcode")) {

int rcode = response.getHeader().getRcode();

if (rcode != Rcode.value(expected)) {

value = Rcode.string(rcode);

flag = false;

}

else if (field.equalsIgnoreCase("serial")) {

Record [] answers = response.getSectionArray(Section.ANSWER);

if (answers.length < 1 || !(answers[0] instanceof SOARecord))

print("Invalid response (no SOA)");

else {

SOARecord soa = (SOARecord) answers[0];

long serial = soa.getSerial();

if (serial != Long.parseLong(expected)) {

value = Long.toString(serial);

flag = false;

}

else if (field.equalsIgnoreCase("tsig")) {

if (response.isSigned()) {

if (response.isVerified())

value = "ok";

else

value = "failed";

}

else

value = "unsigned";

if (!value.equalsIgnoreCase(expected))

flag = false;

}

else if ((section = Section.value(field)) >= 0) {

int count = response.getHeader().getCount(section);

if (count != Integer.parseInt(expected)) {

value = new Integer(count).toString();

flag = false;

}

else

print("Invalid assertion keyword: " + field);

if (flag == false) {

print("Expected " + field + " " + expected +

", received " + value);

while (true) {

Tokenizer.Token token = st.get();

if (!token.isString())

break;

print(token.value);

}

st.unget();

}

return flag;

}

static void

help(String topic) {

System.out.println();

if (topic == null) {

System.out.println("The following are supported commands:\n" +

"add assert class clear date delete\n" +

"echo edns file glue help key\n" +

"log port prohibit query quit require\n" +

"send server show sleep tcp ttl\n" +

"zone #\n");

return;

}

topic = topic.toLowerCase();

if (topic.equals("add"))

System.out.println(

"add <name> [ttl] [class] <type> <data>\n\n" +

"specify a record to be added\n");

else if (topic.equals("assert"))

System.out.println(

"assert <field> <value> [msg]\n\n" +

"asserts that the value of the field in the last\n" +

"response matches the value specified. If not,\n" +

"the message is printed (if present) and the\n" +

"program exits. The field may be any of <rcode>,\n" +

"<serial>, <tsig>, <qu>, <an>, <au>, or <ad>.\n");

else if (topic.equals("class"))

System.out.println(

"class <class>\n\n" +

"class of the zone to be updated (default: IN)\n");

else if (topic.equals("clear"))

System.out.println(

"clear\n\n" +

"clears the current update packet\n");

else if (topic.equals("date"))

System.out.println(

"date [-ms]\n\n" +

"prints the current date and time in human readable\n" +

"format or as the number of milliseconds since the\n" +

"epoch");

else if (topic.equals("delete"))

System.out.println(

"delete <name> [ttl] [class] <type> <data> \n" +

"delete <name> <type> \n" +

"delete <name>\n\n" +

"specify a record or set to be deleted, or that\n" +

"all records at a name should be deleted\n");

else if (topic.equals("echo"))

System.out.println(

"echo <text>\n\n" +

"prints the text\n");

else if (topic.equals("edns"))

System.out.println(

"edns <level>\n\n" +

"EDNS level specified when sending messages\n");

else if (topic.equals("file"))

System.out.println(

"file <file>\n\n" +

"opens the specified file as the new input source\n" +

"(- represents stdin)\n");

else if (topic.equals("glue"))

System.out.println(

"glue <name> [ttl] [class] <type> <data>\n\n" +

"specify an additional record\n");

else if (topic.equals("help"))

System.out.println(

"help\n" +

"help [topic]\n\n" +

"prints a list of commands or help about a specific\n" +

"command\n");

else if (topic.equals("key"))

System.out.println(

"key <name> <data>\n\n" +

"TSIG key used to sign messages\n");

else if (topic.equals("log"))

System.out.println(

"log <file>\n\n" +

"opens the specified file and uses it to log output\n");

else if (topic.equals("port"))

System.out.println(

"port <port>\n\n" +

"UDP/TCP port messages are sent to (default: 53)\n");

else if (topic.equals("prohibit"))

System.out.println(

"prohibit <name> <type> \n" +

"prohibit <name>\n\n" +

"require that a set or name is not present\n");

else if (topic.equals("query"))

System.out.println(

"query <name> [type [class]] \n\n" +

"issues a query\n");

else if (topic.equals("q") || topic.equals("quit"))

System.out.println(

"quit\n\n" +

"quits the program\n");

else if (topic.equals("require"))

System.out.println(

"require <name> [ttl] [class] <type> <data> \n" +

"require <name> <type> \n" +

"require <name>\n\n" +

"require that a record, set, or name is present\n");

else if (topic.equals("send"))

System.out.println(

"send\n\n" +

"sends and resets the current update packet\n");

else if (topic.equals("server"))

System.out.println(

"server <name> [port]\n\n" +

"server that receives send updates/queries\n");

else if (topic.equals("show"))

System.out.println(

"show\n\n" +

"shows the current update packet\n");

else if (topic.equals("sleep"))

System.out.println(

"sleep <milliseconds>\n\n" +

"pause for interval before next command\n");

else if (topic.equals("tcp"))

System.out.println(

"tcp\n\n" +

"TCP should be used to send all messages\n");

else if (topic.equals("ttl"))

System.out.println(

"ttl <ttl>\n\n" +

"default ttl of added records (default: 0)\n");

else if (topic.equals("zone") || topic.equals("origin"))

System.out.println(

"zone <zone>\n\n" +

"zone to update (default: .\n");

else if (topic.equals("#"))

System.out.println(

"# <text>\n\n" +

"a comment\n");

else

System.out.println ("Topic '" + topic + "' unrecognized\n");

}

public static void

main(String args[]) throws IOException {

InputStream in = null;

if (args.length >= 1) {

try {

in = new FileInputStream(args[0]);

}

catch (FileNotFoundException e) {

System.out.println(args[0] + " not found.");

System.exit(1);

}

else

in = System.in;

update u = new update(in);

}

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