82 lines
2.7 KiB
Plaintext
82 lines
2.7 KiB
Plaintext
#
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# Script fragment to make dhclient supply nameserver information to resolvconf
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#
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# Tips:
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# * Be careful about changing the environment since this is sourced
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# * This script fragment uses bash features
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# * As of isc-dhcp-client 4.2 the "reason" (for running the script) can be one of the following.
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# (Listed on man page:) MEDIUM(0) PREINIT(0) BOUND(M) RENEW(M) REBIND(M) REBOOT(M) EXPIRE(D) FAIL(D) RELEASE(D) STOP(D) NBI(-) TIMEOUT(M)
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# (Also used in master script:) ARPCHECK(0), ARPSEND(0)
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# (Also used in master script:) PREINIT6(0) BOUND6(M) RENEW6(M) REBIND6(M) DEPREF6(0) EXPIRE6(D) RELEASE6(D) STOP6(D)
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# (0) = master script does not run make_resolv_conf
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# (M) = master script runs make_resolv_conf
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# (D) = master script downs interface
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# (-) = master script does nothing with this
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if [ -x /sbin/resolvconf ] ; then
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# For safety, first undefine the nasty default make_resolv_conf()
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make_resolv_conf() { : ; }
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case "$reason" in
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BOUND|RENEW|REBIND|REBOOT|TIMEOUT)
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# Define a resolvconf-compatible m_r_c() function
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# It gets run later (or, in the TIMEOUT case, MAY get run later)
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make_resolv_conf() {
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local R
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local N
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R=""
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if [ "$new_domain_name_servers" ] && [ "$new_domain_name" ] ; then
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R="${R}domain $new_domain_name
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"
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fi
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if [ "$new_domain_name_servers" ] && [ "$new_domain_search" ] ; then
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R="${R}search $new_domain_search
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"
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fi
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for N in $new_domain_name_servers ; do
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R="${R}nameserver $N
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"
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done
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[ ! "$interface" ] || echo -n "$R" | /sbin/resolvconf -a "${interface}.dhclient"
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}
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;;
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BOUND6|RENEW6|REBIND6)
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# Define a resolvconf-compatible m_r_c() function
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# It gets run later (or, in the TIMEOUT case, MAY get run later)
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make_resolv_conf() {
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local R
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local N
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local N_LOW
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local ZONE_ID
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R=""
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if [ "$new_dhcp6_name_servers" ] && [ "$new_dhcp6_domain_search" ] ; then
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R="${R}search $new_dhcp6_domain_search
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"
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fi
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for N in $new_dhcp6_name_servers ; do
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# If the nameserver has a link-local address
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# then add a zone ID (interface name) to it.
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N_LOW="$(echo "$N" | tr '[:upper:]' '[:lower:]')"
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if expr "$N_LOW" : ^fe80:: >/dev/null ; then
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ZONE_ID="%$interface"
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else
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ZONE_ID=""
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fi
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R="${R}nameserver $N$ZONE_ID
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"
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done
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[ ! "$interface" ] || echo -n "$R" | /sbin/resolvconf -a "${interface}.ip6.dhclient"
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}
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;;
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EXPIRE|FAIL|RELEASE|STOP)
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# Delete resolv.conf info
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[ ! "$interface" ] || /sbin/resolvconf -d "${interface}.dhclient"
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;;
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EXPIRE6|RELEASE6|STOP6)
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# Delete resolv.conf info
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[ ! "$interface" ] || /sbin/resolvconf -d "${interface}.ip6.dhclient"
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;;
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esac
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fi
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