Need to write a program to execute a list of system commands

This is a discussion on Need to write a program to execute a list of system commands within the C Programming forums, part of the General Programming Boards category; Hi guys, I am new to C and I am currently working on IPsec running on a linux box. In ...

  1. #1
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    Need to write a program to execute a list of system commands

    Hi guys,

    I am new to C and I am currently working on IPsec running on a linux box.

    In order to setup an IPsec connection I need to execute a list of commands such as the following:

    $ ipsec whack --name new
    $ ipsec whack --listen
    $ isec whack --initiate


    Now I want to combine all these into a single program so that whenever I run that program all the above commands get executed. Now I know that it is easier to do in shell scripting but then I won't be able to include my input data, i.e., I need to specify between which 2 hosts the connection is to be made.

    I give this information in the command line, for eg, say runprog 190.175.1.1 190 175.2.2 where the connection is setup between the 2 ip addresses.

    Hence I need to get this information from the command line and include it in the ipsec commands.

    The list of ipsec commands I'll need to execute manually in order to do this will be:

    $ ipsec pluto
    $ ipsec whack --name new --host 190.175.1.1 --to --host 190.175.2.2 --psk
    $ ipsec whack --listen
    $ ipsec whack --initiate


    Looking forward to any help possible. Thanks in advance.

  2. #2
    CSharpener vart's Avatar
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    still I think it is easier to do with the shell script...

    But if you want to write a C program - look at the argv/argc arguments of the main()
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

  3. #3
    Registered User
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    Quote Originally Posted by mdthahir View Post
    Hi guys,

    I am new to C and I am currently working on IPsec running on a linux box.

    In order to setup an IPsec connection I need to execute a list of commands such as the following:

    $ ipsec whack --name new
    $ ipsec whack --listen
    $ isec whack --initiate


    Now I want to combine all these into a single program so that whenever I run that program all the above commands get executed. Now I know that it is easier to do in shell scripting but then I won't be able to include my input data, i.e., I need to specify between which 2 hosts the connection is to be made.

    I give this information in the command line, for eg, say runprog 190.175.1.1 190 175.2.2 where the connection is setup between the 2 ip addresses.

    Hence I need to get this information from the command line and include it in the ipsec commands.

    The list of ipsec commands I'll need to execute manually in order to do this will be:

    $ ipsec pluto
    $ ipsec whack --name new --host 190.175.1.1 --to --host 190.175.2.2 --psk
    $ ipsec whack --listen
    $ ipsec whack --initiate


    Looking forward to any help possible. Thanks in advance.
    You can still do this with a shell script. Probably easier than in a C program.

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