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  #1  
Old 14-Feb-2008, 10:28
kterry kterry is offline
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Probing for TCP connections

I am writing an application that will look for a specific TCP connection in windows XP. I am very new to C as I am a PHP programmer. Is there a library that I can use or is there some native function to look at the TCP connections on the machine?

Is there a way to just look at netstat data?

This application will make sure some encoding software is connected to a media server at all times. So I just need it to check if the connection is present.

I will be compiling it to use on Windows XP and I will be using C, not C++

Thanks!
  #2  
Old 14-Feb-2008, 11:56
davis
 
Posts: n/a

Re: Probing for TCP connections

Quote:
Originally Posted by kterry
Is there a way to just look at netstat data?

Yes!

Use the IpHelper API and link to iphlpapi.lib

Check out: msdn2.microsoft.com

...to see if that does about what you're trying to accomplish.


:davis:
  #3  
Old 14-Feb-2008, 12:27
davis
 
Posts: n/a

Re: Probing for TCP connections

Also,

If you want, you can write a simple C program that invokes netstat and dumps that info to a text file and then parse the text file...

CPP / C++ / C Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
    size_t done;
    char buffer[BUFSIZ] = {0};
    FILE* fp_input;
    system( "netstat -a > output.txt" );
    fp_input = fopen( "output.txt", "r" );
    if( fp_input != NULL )
    {
        do
        {
            done = fread( buffer, BUFSIZ, 1, fp_input );
            printf( "%s", buffer );
        } while( done > 0 );
        printf( "\r\n" );
        fclose( fp_input );
    }
    return 0;
}

Output:

Code:
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 localhost:mysql         *:*                     LISTEN
tcp        0      0 *:www                   *:*                     LISTEN
tcp        0      0 *:ftp                   *:*                     LISTEN
tcp        0      0 localhost:ipp           *:*                     LISTEN
tcp        0      0 localhost:smtp          *:*                     LISTEN
tcp6       0      0 *:ssh                   *:*                     LISTEN
tcp6       0     52 ::ffff:nnn.nn.nnn.n:ssh ::ffff:nnn.nn.nnn.:2131 ESTABLISHED
udp        0      0 *:32769                 *:*
udp        0      0 *:mdns                  *:*
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node Path
unix  2      [ ACC ]     STREAM     LISTENING     17344    /tmp/.X11-unix/X0
unix  2      [ ACC ]     STREAM     LISTENING     17191    @/var/run/dbus-ZSwXtyhGgP
unix  2      [ ACC ]     STREAM     LISTENING     15124    /var/run/dbus/system_bus_socket
unix  2      [ ACC ]     STREAM     LISTENING     14870    /var/run/acpid.socket
unix  2      [ ACC ]     STREAM     LISTENING     17189    /var/run/sdp
unix  2      [ ]         DGRAM                    8588     @/com/ubuntu/upstart
unix  2      [ ACC ]     STREAM     LISTENING     17205    @/org/bluez/audio
unix  2      [ ]         DGRAM                    8736     @/org/kernel/udev/udevd
unix  2      [ ]         DGRAM                    15212    @/org/freedesktop/hal/udev_event
unix  2      [ ACC ]     STREAM     LISTENING     16529    /var/run/cups/cups.sock
unix  2      [ ACC ]     STREAM     LISTENING     17300    /var/run/gdm_socket
unix  2      [ ACC ]     STREAM     LISTENING     15201    @/var/run/hald/dbus-wjjrwe1FpS
unix  2      [ ACC ]     STREAM     LISTENING     15204    @/var/run/hald/dbus-gZH8KltPsY
unix  11     [ ]         DGRAM                    15034    /dev/log
unix  2      [ ACC ]     STREAM     LISTENING     17107    /var/run/avahi-daemon/socket
unix  2      [ ACC ]     STREAM     LISTENING     16607    /var/run/mysqld/mysqld.sock
unix  2      [ ACC ]     STREAM     LISTENING     15184    @/tmp/dbus-TR3R4juVQD
unix  2      [ ]         DGRAM                    41184
unix  3      [ ]         STREAM     CONNECTED     41181
unix  3      [ ]         STREAM     CONNECTED     41180
unix  3      [ ]         STREAM     CONNECTED     17628    /tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     17627
unix  3      [ ]         STREAM     CONNECTED     17614    /tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     17613
unix  3      [ ]         STREAM     CONNECTED     17355    /var/run/acpid.socket
unix  3      [ ]         STREAM     CONNECTED     17354
unix  3      [ ]         STREAM     CONNECTED     17580    /tmp/.X11-unix/X0
unix  3      [ ]         STREAM     CONNECTED     17348
unix  3      [ ]         STREAM     CONNECTED     17202    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     17201
unix  2      [ ]         DGRAM                    17200
unix  3      [ ]         STREAM     CONNECTED     17199    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     17198
unix  2      [ ]         DGRAM                    17197
unix  3      [ ]         STREAM     CONNECTED     17182    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     17181
unix  2      [ ]         DGRAM                    17165
unix  3      [ ]         STREAM     CONNECTED     17119    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     17118
unix  2      [ ]         DGRAM                    17117
unix  3      [ ]         STREAM     CONNECTED     17110    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     17109
unix  3      [ ]         STREAM     CONNECTED     17104
unix  3      [ ]         STREAM     CONNECTED     17103
unix  2      [ ]         DGRAM                    17101
unix  3      [ ]         STREAM     CONNECTED     17067    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     17066
unix  2      [ ]         DGRAM                    16604
unix  3      [ ]         STREAM     CONNECTED     16516    @/var/run/hald/dbus-wjjrwe1FpS
unix  3      [ ]         STREAM     CONNECTED     16515
unix  3      [ ]         STREAM     CONNECTED     16513    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     16512
unix  3      [ ]         STREAM     CONNECTED     16110    /var/run/acpid.socket
unix  3      [ ]         STREAM     CONNECTED     16109
unix  3      [ ]         STREAM     CONNECTED     16087    @/var/run/hald/dbus-wjjrwe1FpS
unix  3      [ ]         STREAM     CONNECTED     16083
unix  3      [ ]         STREAM     CONNECTED     16086    @/var/run/hald/dbus-wjjrwe1FpS
unix  3      [ ]         STREAM     CONNECTED     15668
unix  3      [ ]         STREAM     CONNECTED     16084    @/var/run/hald/dbus-wjjrwe1FpS
unix  3      [ ]         STREAM     CONNECTED     15654
unix  3      [ ]         STREAM     CONNECTED     16078    @/var/run/hald/dbus-wjjrwe1FpS
unix  3      [ ]         STREAM     CONNECTED     15641
unix  3      [ ]         STREAM     CONNECTED     15207    @/var/run/hald/dbus-gZH8KltPsY
unix  3      [ ]         STREAM     CONNECTED     15206
unix  3      [ ]         STREAM     CONNECTED     15203    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     15202
unix  3      [ ]         STREAM     CONNECTED     15190    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     15189
unix  3      [ ]         STREAM     CONNECTED     15187
unix  3      [ ]         STREAM     CONNECTED     15186
unix  3      [ ]         STREAM     CONNECTED     15188    @/tmp/dbus-TR3R4juVQD
unix  3      [ ]         STREAM     CONNECTED     15185
unix  3      [ ]         STREAM     CONNECTED     15158    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     15157
unix  3      [ ]         STREAM     CONNECTED     15147    /var/run/dbus/system_bus_socket
unix  3      [ ]         STREAM     CONNECTED     15146
unix  2      [ ]         DGRAM                    15142
unix  3      [ ]         STREAM     CONNECTED     15127
unix  3      [ ]         STREAM     CONNECTED     15126
unix  2      [ ]         DGRAM                    15103

..then, you can set up a cron job (`at' under Windoze) to run your app and do whatever it is that you want based on the result of your parsing.


:davis:
  #4  
Old 14-Feb-2008, 12:32
kterry kterry is offline
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Posts: 2
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Re: Probing for TCP connections

The text dump is exactly what i was trying to do! Thanks!

This is making me enjoy C. I want to learn the language now.
 
 
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