GIDForums  

Go Back   GIDForums > Computer Programming Forums > C Programming Language
Reload this Page Probing for TCP connections
User Name
Password
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

 
 
Thread Tools Search this Thread Rate Thread
  #1  
Old 14-Feb-2008, 10:28
kterry kterry is offline
New Member
  
Join Date: Feb 2008
Posts: 2
kterry is on a distinguished road

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
New Member
  
Join Date: Feb 2008
Posts: 2
kterry is on a distinguished road

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.
 
 
« Previous Thread | Next Thread »

Recent GIDBlogToyota - 2008 November Promotion by Nihal

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
hardware probing using c program helpmeforlinux C Programming Language 0 29-Sep-2006 01:29
mysql_pconnect: Too many connections error agligich MySQL / PHP Forum 6 09-Aug-2005 10:16
Determining the connections in apache mkbijoy Apache Web Server Forum 2 23-Nov-2004 22:11
Http connections mail_as C Programming Language 1 03-Jul-2004 13:16
MySQL persistant connections or not? JdS Web Hosting Forum 0 02-Jun-2002 06:49

Network Sites: GIDNetwork · GIDWebHosts · GIDSearch · Learning Journal by J de Silva, The

All times are GMT -6. The time now is 06:15.

Contact Us - GIDForums™ - Archive - Top

vBulletin, Copyright © 2000 - 2008, Jelsoft Enterprises Ltd.