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Most of the code you will need to fill in is similar to the code you wrote in the WebServer lab You may want to use the code you have written there to help you To make it easier to debug your program, do not, at first, include the code that opens the socket, but use the following definitions for fromServer and toServer This way, your program sends the commands to the terminal Acting as the SMTP server, you will need to give the correct reply codes When your program works, add the code to open the socket to the server fromServer = new BufferedReader(new InputStreamReader(System in)); toServer = Systemout; The lines for opening and closing the socket, ie, the lines connection = in the constructor and the line connectionclose() in function close(), have been commented out by default Start by completing the function parseReply() You will need this function in many places In the
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function parseReply(), you should use the StringTokenizer-class for parsing the reply strings You can convert a string to an integer as follows: int i = IntegerparseInt(argv[0]); In the function sendCommand(), you should use the function writeBytes() to write the commands to the server The advantage of using writeBytes() instead of write() is that the former automatically converts the strings to bytes which is what the server expects Do not forget to terminate each command with the string CRLF You can throw exceptions like this: throw new Exception(); You do not need to worry about details, since the exceptions in this lab are only used to signal an error, not to give detailed information about what went wrong
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You may want to try the following optional exercises to make your program more sophisticated For these exercises, you will need to modify also the other classes (MailClient, Message, and Envelope)
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Verify sender address Java's System-class contains information about the username and the InetAddress-class contains methods for finding the name of the local host Use these to construct the sender address for the Envelope instead of using the user-supplied value in the From-header Additional headers The generated mails have only four header fields, From, To, Subject, and Date Add other header fields from RFC 822, eg, Message-ID, Keywords Check the RFC for the definitions of the different fields Multiple recipients Currently the program only allows sending mail to a single recipient Modify the user interface to include a Cc-field and modify the program to send mail to both recipients For a more challenging exercise, modify the program to send mail to an arbitrary number of recipients More error checking The provided code assumes that all errors that occur during the SMTP connection are fatal Add code to distinguish between fatal and non-fatal errors and add a mechanism for signaling them to the user Check the RFC to see what the different reply codes mean This exercise may require large modifications to the send(), sendCommand(), and parseReply() functions
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The Domain Name System (DNS) stores information in resource records Normal name to IP-address mappings are stored in type A (Address) resource records Type NS (NameServer) records hold information about nameservers and type MX (Mail eXchange) records tell which server is handling the mail delivery of the domain The server you need to find is the server handling the mail for the domain to which you are sending mail, ie, the MX-host of that domain First, you must find the nameserver of the target domain and then query this nameserver for the MX-host Assuming you were sending mail to the address user@someschooledu you would do the following: 1 Find the address of a nameserver for the top-level domain edu (NS query) 2 Query the nameserver for edu about the nameserver for the domain someschooledu to get the address of Someschool's nameserver (NS query) 3 Query Someschool's nameserver for MX-records for the domain someschooledu (MX query) Ask your local system administrator how to perform DNS queries manually Under Unix you can query DNS manually with the nslookup-command The syntax of the nslookup-command is as follows Note that the argument host can also be a domain Normal query Normal query using a given server NS-query MX-query nslookup host nslookup host server nslookup -type=NS host nslookup -type=MX host
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For the first step, finding the nameserver of the top-level domain, you will need to send your query to one of the 13 DNS root nameservers You can find more information about the DNS root servers in Section DNS - The Internet's Directory Service The root servers are listed in the file root-serverstxt, available from Internic The reply to the MX-query may contain multiple mail exchangers Each of them is preceded by a number which is the preference value for this server Lower preference values indicate preferred servers so you should use the server with the lowest preference value
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