Assignment 2

1. Download the source code from the author's website. Extract the source code files into your local machine with the following command:

   % tar xvfz unpv12e.tar.gz

   A directory unpv12e will be created. In directory ./unpv12e/intro, you can find the souce code for the daytime server. Starting from daytimetcpsrv3.c and daytimetcpcli3.c, you are required to build your own daytime server and client.

   Some requirements should be followed:

   1. No user defined header files, such as unp.h, should be used.
   2. A makefile should be supplied to build the server and the client. The makefile should compile the souce code files and generate two executables: daytimetcpsrv3 for the server, and daytimetcpcli3 for the client. The target to build the application is daytime, which means one can type the following command to build the application:

      % make daytime

2. Write a program to accomplish the domain name resolution. The program has the following syntax:

   % gethost [-r] name

   When there's no option, this program prints all the IP addresses for a host whose name is specified by name in the command.

   When option -r is present, the program accepts an IP address in the dotted notation form and prints all the domain names for this IP address.

   Your program should detect all possible invalid names.

   You should share the makefile of the above daytime application. The target to build the executable is gethost. The source code file should be gethost.c, or gethost.cc. The name of the executable should be gethost.

• The due date is 9/20.

• Grading policy: (1) 50 (2) 50

• Two or three students work on one project. No more than two students from Computer Science Department are allowed in one group.

• Both the hard copy and the electronic copy should be submitted for each group. Do not submit multiple copies from individuals in the same group.

  The hard copy should have a cover sheet that contains you names, account names, course title, assignment number, and etc. The submission should also include a file called README that contains the following information:

  • Instructions to build your application programs
  • Instructions to test the programs
  • Each member's contribution to this project. The description should be very specific. Vague accounts, such as Each member contributed evenly in the project, should be avioded. Instead, you should give the detailed description of your work in the project. One such example is:
    John Castro wrote host.c (line 1 to 120) on Sep 12,
    Jennifer Lipkin debugged host.c and fixed 3 bugs, and so on.

• The submission ID for the handin program is 2. To submit your assignment with the handin program, type:

  ~cs742/bin/handin 2 files-to-submit

  The following files should be submitted:

  README Makefile gethost.c daytimetcpsrv3.c daytimetcpcli3.c

  Once again please make sure that you are in the student list.

• Necessary comments should be included in your programs.