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TCP/IP: Determine IP# for PPP interface on WIN32

Posted on 1998-07-29
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Last Modified: 2010-03-05
The following code will provide you with the IP# on the primary Ethernet Card in Win95. However, it won't let you find out your current PPP IP#.

Extra Special points for anyone who can tell me how to find ALL IP#'s on the machine (ex. 2 PPP connects + 2 ethernet cards) - using PERL not winipcfg :-)

Thanks,
Timothy


use Sys::Hostname;
print "start of an IP Poster in PERL\n";
print join '.', unpack 'C4', gethostbyname hostname;
print "\n" . hostname;
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Question by:tcolson
3 Comments
 

Expert Comment

by:ijduggan
ID: 1208876
Is it possible for you to just parse the output of the netstat program?

"netstat -n"  returns data on current connections. You could try something like:

my %connections;
open(NETSTAT, "netstat -n |");
while(<NETSTAT>) {


process netstat data


}

Does netstat provide you with enough information to do what you want?

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Author Comment

by:tcolson
ID: 1208877
IJDUGGAN wrote:
>Does netstat provide you with enough information
>to do what you want?
Unfortunately no - Netstat provides you with currently active connections on specific ports. So, for example, right now I'm connected to my ISP...and every 5 minutes my email client polls for mail -> during this time:
C:\WINDOWS>netstat
Active Connections
  Proto  Local Address          Foreign Address        State
  TCP    homebrew:1045          popserver.somewhere.com:pop3  TIME_WAIT

However, after this connection has closed:
C:\WINDOWS>netstat
Active Connections
  Proto  Local Address          Foreign Address        State

-> No data. But I am still connected to my ISP...so there must be another way to find the IP#.

Perhaps the answer lies in finding out where WINIPCFG gets its information from??? This stuff must be in the registry somewhere, eh?

Thanks,
TLC

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by:
b2pi earned 100 total points
ID: 1208878
It's doable... but somewhat difficult.  You'll rely heavily on the registry module, and I'll assume you know how to use that.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NetBT\Adapters
has subkeys that are a list of all the adapters. Those that are active will have NameServer and NameServerBackup values (but those will be blank)

On my machine, I've got
HKLM\CurrentControlSet\Services\NetBT\Adapters\El90x1
and
HKLM\CurrentControlSet\Services\NetBT\Adapters\NdisWan6

Then, go to
HKLM\CurrentControlSet\Services\X\Parameters\Tcpip
(Where X is one of the listed subkeys above, for instance El90x1, above)
and look at the value IPAddress for for the IPAddress.

So, that's of moderate difficulty?
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