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#!/bin/bash
# Authors: Steven Shiau <steven _at_ clonezilla org>, Ceasar Sun <ceasar _at_ nchc org tw>
# License: GPL
# Description: Get the IP address of network card interface
# Load DRBL setting and functions
DRBL_SCRIPT_PATH="${DRBL_SCRIPT_PATH:-/usr/share/drbl}"
. $DRBL_SCRIPT_PATH/sbin/drbl-conf-functions
ethx=$1
export LC_ALL=C
Usage() {
echo "Get the IP address of network card interface"
echo "Usage:"
echo "$(basename $0) INTERFACE"
echo "Ex: $(basename $0) eth0"
}
# For physical NIC, the output of "ifconfig -a" (Debian, Ubuntu and Fedora <=14) is like:
# eth0 Link encap:Ethernet HWaddr 00:11:aa:bb:cc:dd
# For ppp0 NIC, it's like:
# ppp0 Link encap:Point-to-Point Protocol
# Ref: http://sourceforge.net/projects/drbl/forums/forum/394008/topic/3855959
# For Fedora 17, the output of "ifconfig -a" is like (//Note// An extra ":"):
# eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
# inet 192.168.120.192 netmask 255.255.255.0 broadcast 192.168.120.255
# inet6 fe80::20c:29ff:fe97:5d0f prefixlen 64 scopeid 0x20<link>
# ether 00:0c:29:97:5d:0f txqueuelen 1000 (Ethernet)
# RX packets 1998 bytes 179313 (175.1 KiB)
# RX errors 0 dropped 0 overruns 0 frame 0
# TX packets 1305 bytes 198243 (193.5 KiB)
# TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[ -z "$ethx" ] && Usage && exit 1
if ! LC_ALL=C ifconfig -a 2>/dev/null | grep -i -q "\<$ethx\>"; then
exit 1
fi
# //NOTE// Here we have to use grep "-w" to grep the IPv4 address, avoding getting IPv6 address. E.g.:
# eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
# inet 192.168.77.254 netmask 255.255.255.0 broadcast 192.168.77.255
# inet6 fe80::20c:29ff:fee9:f24e prefixlen 64 scopeid 0x20<link>
LC_ALL=C ifconfig $ethx | grep -w -A1 $ethx | grep -w -v $ethx | grep -w "inet" |sed -e 's/addr://'| sed -e 's/^.*inet \([0-9\.]\+\).*$/\1/'
exit 0
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