Couple of Socket Questions

nugol · #1 26-Aug-2006, 11:27

I am currently working on some socket programming, created a few programs but here is my question.

Info: Creating telnet server, attempting to add in client functions via the System(function) command

1) Is there a way to take a system function and send the results to the client, i.e.

the result of 'ps -aux' or 'tasklist' and send it to the client, i can currently have it first create a temporary file, then read the file to the client, is there a better way?

2) Does anyone have a link to a tutorial on unix/linux file sending programming? I cannot seem to find anything, unless I want to do with Windows. I take it isnt as easy as send(int, file, bitsize, int)

Thx for everything

davekw7x · #2 26-Aug-2006, 13:03

Quote:

Originally Posted by nugol

1) Is there a way to take a system function and send the results to the client, i.e.

You might consider using a pipe. Here is an example that should work for Linux (gcc compiler):

CPP / C++ / C Code:

#include <stdio.h>
#include <stdlib.h>

int main()
{
    FILE *inpipe;
    char inbuf[1000];

    int i;
    int inchar;
    /*char *command = "ls -l"; */
    char *command = "cat z.txt";

    inpipe = popen(command, "r");
    if (!inpipe) {
        printf("couldn't open pipe %s\n", command);
        return 0;
    }
    else {
        printf("Pipe <%s> opened for reading\n", command);
    }

    for (i = 0; i < sizeof(inbuf) - 1; i++) {
        inchar = fgetc(inpipe);
        if (inchar == EOF) {
            break;
        }
        inbuf[i] = inchar;
    }
    inbuf[i] = 0;
    printf("Number of chars read = %d\n", i);
    printf("inbuf: <%s>\n", inbuf);
    pclose(inpipe);

    return 0;
}

Here's the text file that I used:

Code:

Fourscore and seven years ago our fathers brought forth,
upon this continent, a new nation, conceived in liberty and
dedicated to the proposition that all men are created equal.

Here's the output on my Fedora Core 5 platform:

Code:

Pipe <cat z.txt> opened for reading
Number of chars read = 178
inbuf: <Fourscore and seven years ago our fathers brought forth,
upon this continent, a new nation, conceived in liberty and
dedicated to the proposition that all men are created equal.
>

Note that prototypes for popen() and pclose() are found in the GNU header <stdio.h>, and the functions are linked into my program automatically with the rest of the standard library, but the functions themselves are not part of the C (or C++) standard libraries.

Borland and Microsoft Windows compiler users can try pipes with _popen() and _pclose() instead of popen() and pclose().

Quote:

Originally Posted by nugol

2) Does anyone have a link to a tutorial on unix/linux file sending programming?

If by "file sending" you mean network programming (sockets programming), the answer is, "Yes, and it's a good one!"

Beej's Guide

Regards,

Dave

nugol · #3 26-Aug-2006, 13:38

Thank you for the very detailed help! It helped a lot and the link was awesome, thank you.

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Couple of Socket Questions

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Re: Couple of Socket Questions