TCP/IP Networking in Java

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reply The initial time-out value used by the client can be set explicitly using the setDNSTimeout method
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public static boolean setDNSTimeout(int dnsTimeout)
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The dnsTimeout value is speci ed in milliseconds, but values of at least 1 second (1000 milliseconds) or greater should be speci ed If a non-zero time-out value is speci ed, the DNS client will send the request and wait for up to dnsTimeout milliseconds for a response from the server If no response is received, it will not retry the request If the time-out value is set to zero, a fallback and retry procedure will take effect The DNS client will retry after a 2-second period and double the time-out value until it reaches 16 seconds This produces a maximum four retries before the DNS client nally gives up If during the creation of a new instance of InetAddress a forward lookup fails, either due to a time-out or another DNS server error, an UnknownHostException is thrown If, however, an error occurs trying to perform a reverse lookup, no exception is thrown, since the IP address is all that is required to communicate with the remote host The class DNSClient in the comdalsemitininetdns package implements TINI s DNS client It exposes public methods for performing both forward and reverse lookups
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public String[] getByName(String name) public String[] getByIP(String ip)
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The getByName method performs a forward lookup, taking a host name as input It returns an array of Strings encoded in dotted-decimal notation representing all of the IP addresses that map to that name4 The getByIP method takes as input a String representation of the IP address encoded in dotted-decimal notation It returns an array of strings representing all of the host names that map to the input IP address These methods can be used directly for name resolution without adding entries to the DNS cache maintained internally by InetAddress You can interact with the raw (without going through InetAddress) DNS client using the slush command nslookup It takes either an IP address in dotted-decimal notation or a host name as a command line parameter and performs either a forward or reverse lookup, depending on the input It is a simple matter to create our own nslookup application using just the InetAddress class The DNSTest application is shown in Listing 52 It takes the same command line input as the nslookup command
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4 A host name can have multiple IP addresses, and multiple host names can map to the same IP address
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HTTP Listing 52 DNSTest
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import javanetInetAddress; import javanetUnknownHostException; class DNSTest { public static void main(String[] args) { if (argslength != 1) { Systemoutprintln("Usage: java DNSTesttini name"); Systemexit(1); } try { InetAddress[] names = InetAddressgetAllByName(args[0]); for (int i = 0; i < nameslength; i++) { Systemoutprintln(names[i]toString()); } } catch (UnknownHostException uhe) { Systemoutprintln("Lookup error:" + uhegetMessage()); } } }
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The getAllByName method is used to generate an array of all DNS entries for the given input They are displayed using the InetAddresstoString method, which generates a String containing both the host name and IP address Before this example is run on a TINI, the primary DNS server IP address must be set The following output shows the IP address of the iButton Web server
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TINI /> java DNSTesttini wwwibuttoncom wwwibuttoncom/1983123121
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If we run DNSTest again but this time supply a bogus host name, getAllByName will be unable to resolve the name to an IP address and will throw an UnknownHostException
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TINI /> java DNSTesttini bogusainttherecom Lookup error:Could not find an entry for bogusainttherecom
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The class HTTPServer in the comdalsemitininethttp package implements a very simple HTTP server It supports only HTTP GET requests and serves up static information contained within les at or below a speci ed root directory It is not intended to be a dedicated Web server application but rather provide HTTP serving capability that an application can launch and forget about HTTPServer offers reasonable performance, and the overhead it imposes on an application is relatively small The basic idea is that the server should not detract much from the application s foreground processing requirements
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