finding local ip

hi all

how do i find out the ip address of the local machine programatically?

thanks shyam

On 20 Feb 2006 06:13:54 -0800, shyam wrote:
> hi all
>
> how do i find out the ip address of the local machine programatically?

You could parse it from
ifconfig
or ping -c 1 $(hostname)

I have a question for you. Your header has "Windows NT 5.0"
What is the Microsoft name of your operating system (NT, SE, XP Home,...) ?

shyam wrote:
> hi all
>
> how do i find out the ip address of the local machine programatically?
>
> thanks shyam
>
$hostname
$ping [what was given off by the hostname command]

poly-p man

i am looking for a way to do it using the unix socket functions

On 20 Feb 2006 06:29:12 -0800, shyam wrote:
> i am looking for a way to do it using the unix socket functions

Answer my question and I will give another answer.

Your header has "Windows NT 5.0"
What is the Microsoft name of your operating system (NT, SE, XP Home,...) ?

In article <(E-Mail Removed)>,
(E-Mail Removed) says...
> On 20 Feb 2006 06:29:12 -0800, shyam wrote:
> > i am looking for a way to do it using the unix socket functions
>
> Answer my question and I will give another answer.
>
> Your header has "Windows NT 5.0"
> What is the Microsoft name of your operating system (NT, SE, XP Home,...) ?

Well, NT 5.0 is technically Windows 2000, but I can't remember what the
development name was (I know it wasn't Chicago or Longhorn though).

--
AG

Remove removes from address to remove anti-spam measures.
-----------------------------------------------------------------------
Alan Gauton E-Mail agauton @ postmaster.co.uk

Never for me the lowered banner, never the last endeavour!
(Damon Hill - 16th June 1999)

ya its windows 2000

On Mon, 20 Feb 2006 14:46:22 -0000, Alan Gauton wrote:
> In article <(E-Mail Removed)>,
>>
>> Your header has "Windows NT 5.0"
>> What is the Microsoft name of your operating system (NT, SE, XP Home,...) ?
>
> Well, NT 5.0 is technically Windows 2000, but I can't remember what the

Ah, Windows 2000 is what I was after.

Thank you.

On 20 Feb 2006 06:48:58 -0800, shyam wrote:
> ya its windows 2000

apropos gethost
man -k gethost

shyam wrote:

> i am looking for a way to do it using the unix socket functions
>

Try using

socket(AF_INET,SOCK_DGRAM,0)
....

addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = 0;

bind( fd,(struct sockaddr*)&addr, sizeof(struct sockaddr_in) )
....


addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_aton( ip-address of your DNS server );
addr.sin_port = 53;

connect( fd, (struct sockaddr*)&addr, sizeof(struct sockaddr_in) )
....
# yes you can connect a UDP socket, but no IP packets are transmitted
# then kernel finds the interface to use when sending to your DNS server
# the IP address of your DNS server is in /etc/resolv.conf
# but you should have problems finding /etc/resolv.conf in WinXX

getsockname( fd, (struct sockaddr*)addr, &retlen )

printf( "%s\n", inet_ntoa(addr.sin_adr.s_addr) );

# should then be the ip address if the interface


Not tested!

This is one solution, maybe not the best and will give you the
IP-address used when communicating with your DNS server.
There may be more IP-addresses assigned to your box, depending
on the number of NICs.

man socket
man bind
man connect
man getsockname
man inet_ntoa

should lead you further (on *x* systems, but not *X* like WinXP)

HTH
Toni