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Top Forums Programming C program : how to list interfaces with a valid IP ? Post 302158632 by *ptr on Wednesday 16th of January 2008 01:58:22 AM
Old 01-16-2008
Hi

You can use the "system" function from C, and you can call ifconfig like commands (i'm not sure that such command exist on UN*X, but it is possible). In that way you can list the interfaces. If you pipe the command with grep, you can also filter out which interfaces has a valid IP address.

Hope it helps
 

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inet_type(4)                                                       File Formats                                                       inet_type(4)

NAME
inet_type - default Internet protocol type SYNOPSIS
/etc/default/inet_type DESCRIPTION
The inet_type file defines the default IP protocol to use. Currently this file is only used by the ifconfig(1M) and netstat(1M) commands. The inet_type file can contain a number of <variable>=<value> lines. Currently, the only variable defined is DEFAULT_IP, which can be assigned a value of IP_VERSION4, IP_VERSION6, or BOTH. The output displayed by the ifconfig and netstat commands can be controlled by the value of DEFAULT_IP set in inet_type file. By default, both commands display the IPv4 and IPv6 information available on the system. The user can choose to suppress display of IPv6 information by setting the value of DEFAULT_IP. The following shows the possible values for DEFAULT_IP and the resulting ifconfig and netstat output that will be displayed: IP_VERSION4 Displays only IPv4 related information. The output displayed is backward compatible with older versions of the ifconfig(1M) and netstat(1M) commands. IP_VERSION6 Displays both IPv4 and IPv6 related information for ifconfig and netstat. BOTH Displays both IPv4 and IPv6 related information for ifconfig and netstat. The command-line options to the ifconfig and netstat commands override the effect of DEFAULT_IP as set in the inet_type file. For example, even if the value of DEFAULT_IP is IP_VERSION4, the command example% ifconfig -a6 will display all IPv6 interfaces. EXAMPLES
Example 1: Suppressing IPv6 Related Output This is what the inet_type file must contain if you want to suppress IPv6 related output: DEFAULT_IP=IP_VERSION4 SEE ALSO
ifconfig(1M), netstat(1M) SunOS 5.10 16 Jun 1999 inet_type(4)
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