71 lines
2.1 KiB
Bash
71 lines
2.1 KiB
Bash
#!/usr/bin/env bash
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#
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# Parses DHCP options from openvpn to update resolv.conf
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# To use set as 'up' and 'down' script in your openvpn *.conf:
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# up /etc/openvpn/update-resolv-conf
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# down /etc/openvpn/update-resolv-conf
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#
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# Used snippets of resolvconf script by Thomas Hood <jdthood@yahoo.co.uk>
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# and Chris Hanson
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# Licensed under the GNU GPL. See /usr/share/common-licenses/GPL.
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# 07/2013 colin@daedrum.net Fixed intet name
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# 05/2006 chlauber@bnc.ch
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#
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# Example envs set from openvpn:
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# foreign_option_1='dhcp-option DNS 193.43.27.132'
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# foreign_option_2='dhcp-option DNS 193.43.27.133'
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# foreign_option_3='dhcp-option DOMAIN be.bnc.ch'
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# foreign_option_4='dhcp-option DOMAIN-SEARCH bnc.local'
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## The 'type' builtins will look for file in $PATH variable, so we set the
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## PATH below. You might need to directly set the path to 'resolvconf'
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## manually if it still doesn't work, i.e.
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## RESOLVCONF=/usr/sbin/resolvconf
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export PATH=$PATH:/sbin:/usr/sbin:/bin:/usr/bin
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RESOLVCONF=$(type -p resolvconf)
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case $script_type in
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up)
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for optionname in ${!foreign_option_*} ; do
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option="${!optionname}"
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echo $option
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part1=$(echo "$option" | cut -d " " -f 1)
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if [ "$part1" == "dhcp-option" ] ; then
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part2=$(echo "$option" | cut -d " " -f 2)
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part3=$(echo "$option" | cut -d " " -f 3)
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if [ "$part2" == "DNS" ] ; then
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IF_DNS_NAMESERVERS="$IF_DNS_NAMESERVERS $part3"
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fi
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if [[ "$part2" == "DOMAIN" || "$part2" == "DOMAIN-SEARCH" ]] ; then
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IF_DNS_SEARCH="$IF_DNS_SEARCH $part3"
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fi
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fi
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done
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R=""
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if [ "$IF_DNS_SEARCH" ]; then
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R="search "
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for DS in $IF_DNS_SEARCH ; do
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R="${R} $DS"
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done
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R="${R}
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"
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fi
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for NS in $IF_DNS_NAMESERVERS ; do
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R="${R}nameserver $NS
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"
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done
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#echo -n "$R" | $RESOLVCONF -x -p -a "${dev}"
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echo -n "$R" | $RESOLVCONF -x -a "${dev}.inet"
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;;
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down)
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$RESOLVCONF -d "${dev}.inet"
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;;
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esac
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# Workaround / jm@epiclabs.io
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# force exit with no errors. Due to an apparent conflict with the Network Manager
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# $RESOLVCONF sometimes exits with error code 6 even though it has performed the
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# action correctly and OpenVPN shuts down.
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exit 0
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