How to get ip address from C application

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Miloserdin Oleg Contact options for registered users 's Avatar (by Gravatar) posted on
May 21, 2010, 4:52 pm
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I'm interesting how to get IP address from C application. I've used
gethostname() and gethostbyname() in my application. I've edited /etc/hosts
file to add board's hostname and IP address. My board is connected to server
which using DHCP. If I remove added lines from /etc/hosts gethostbyname()
function returns error.
How can I get IP address from my application without using /etc/hosts
editing?

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Atilla Contact options for registered users 's Avatar (by Gravatar) posted on
May 21, 2010, 1:56 pm
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Re: How to get ip address from C application

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You either need to run a dhcp client on your device(like dhclient or udhcpcd) or
  implement your own DHCP client in your software.

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Grant Edwards Contact options for registered users 's Avatar (by Gravatar) posted on
May 21, 2010, 2:27 pm
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Re: How to get ip address from C application

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You're going to have to explain what you mean by "get IP address".

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Again, what do you mean by "get IP address"?

The following function will "get IP address":

char *foo(void)
{
   return "129.168.32.98";
}

Unless you you can tell us what IP address you want to get, that's as
good a solution as any.

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steve_schefter Contact options for registered users 's Avatar (by Gravatar) posted on
May 21, 2010, 2:58 pm
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Re: How to get ip address from C application
Hi Miloserdin.

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There are a few options to get your address.  You can use
popen("ifconfig eth0"...) and parse the output.  Or you can use an
SIOCGIFADDR ioctl on a socket (google SIOCGIFADDR for the details).

     Steve

David Brown Contact options for registered users 's Avatar (by Gravatar) posted on
May 21, 2010, 3:19 pm
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Re: How to get ip address from C application
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You can try to set up a socket and use getsockname() - I've done that
with Python, so I guess the C code can use the same principle.

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