138 lines
5.4 KiB
Bash
Executable File
138 lines
5.4 KiB
Bash
Executable File
#!/bin/sh
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## Sourced, not exec'ed, but helps syntax highlighting
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#
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# Script fragment to make dhclient supply nameserver information to resolved
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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 systemctl is-enabled systemd-resolved > /dev/null 2>&1; then
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local mystatedir statedir ifindex
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if [ ! "$interface" ] ; then
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return
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fi
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ifindex=$(cat "/sys/class/net/$interface/ifindex")
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if [ ! "$ifindex" ]; then
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return
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fi
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mystatedir=/run/network
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mkdir -p $mystatedir
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statedir=/run/systemd/resolve/netif
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mkdir -p $statedir
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local oldstate="$(mktemp)"
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# ignore errors due to nonexistent file
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md5sum "$mystatedir/isc-dhcp-v4-$interface" "$mystatedir/isc-dhcp-v6-$interface" "$mystatedir/ifupdown-inet-$interface" "$mystatedir/ifupdown-inet6-$interface" > "$oldstate" 2> /dev/null || true
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case "$reason" in
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BOUND|RENEW|REBIND|REBOOT|TIMEOUT|BOUND6|RENEW6|REBIND6)
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if [ -n "$new_domain_name_servers" ] ; then
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cat <<EOF >"$mystatedir/isc-dhcp-v4-$interface"
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DNS="$new_domain_name_servers"
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EOF
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if [ -n "$new_domain_name" ] || [ -n "$new_domain_search" ] ; then
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cat <<EOF >>"$mystatedir/isc-dhcp-v4-$interface"
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DOMAINS="$new_domain_search $new_domain_name"
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EOF
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fi
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fi
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if [ -n "$new_dhcp6_name_servers" ] ; then
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cat <<EOF >"$mystatedir/isc-dhcp-v6-$interface"
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DNS6="$new_dhcp6_name_servers"
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EOF
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if [ -n "$new_dhcp6_domain_search" ] ; then
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cat <<EOF >>"$mystatedir/isc-dhcp-v6-$interface"
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DOMAINS6="$new_dhcp6_domain_search"
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EOF
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fi
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fi
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;;
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EXPIRE|FAIL|RELEASE|STOP)
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rm -f "/run/network/isc-dhcp-v4-$interface"
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;;
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EXPIRE6|RELEASE6|STOP6)
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rm -f "/run/network/isc-dhcp-v6-$interface"
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;;
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esac
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local newstate="$(mktemp)"
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# ignore errors due to nonexistent file
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md5sum "$mystatedir/isc-dhcp-v4-$interface" "$mystatedir/isc-dhcp-v6-$interface" "$mystatedir/ifupdown-inet-$interface" "$mystatedir/ifupdown-inet6-$interface" > "$newstate" 2> /dev/null || true
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if ! cmp --silent "$oldstate" "$newstate" 2>/dev/null; then
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local DNS DNS6 DOMAINS DOMAINS6 DEFAULT_ROUTE
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# v4 first
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if [ -e "$mystatedir/isc-dhcp-v4-$interface" ]; then
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. "$mystatedir/isc-dhcp-v4-$interface"
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fi
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# v4 manual config overrides
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if [ -e "$mystatedir/ifupdown-inet-$interface" ]; then
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. "$mystatedir/ifupdown-inet-$interface"
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fi
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# v6 preffered
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if [ -e "$mystatedir/isc-dhcp-v6-$interface" ]; then
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. "$mystatedir/isc-dhcp-v6-$interface"
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fi
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# v6 manual config overrides
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if [ -e "$mystatedir/ifupdown-inet6-$interface" ]; then
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. "$mystatedir/ifupdown-inet6-$interface"
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fi
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local resolvectl_failed=
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if [ "$DNS" ] || [ "$DNS6" ] ; then
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cat <<EOF >"$statedir/$ifindex"
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# This is private data. Do not parse.
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LLMNR=yes
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MDNS=no
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SERVERS=$(echo $DNS6 $DNS)
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DOMAINS=$(echo $DOMAINS6 $DOMAINS)
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EOF
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if [ -n "$DEFAULT_ROUTE" ]; then
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cat <<EOF >>"$statedir/$ifindex"
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DEFAULT_ROUTE=$DEFAULT_ROUTE
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EOF
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fi
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chown systemd-resolve:systemd-resolve "$statedir/$ifindex"
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# In addition to creating the state file (needed if we run before
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# resolved is started), also feed the information directly to
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# resolved.
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if systemctl --quiet is-active systemd-resolved; then
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resolvectl llmnr "$ifindex" yes || resolvectl_failed=$?
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resolvectl mdns "$ifindex" no || resolvectl_failed=$?
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if [ "$DOMAINS6" ] || [ "$DOMAINS" ]; then
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resolvectl domain "$ifindex" $DOMAINS6 $DOMAINS || resolvectl_failed=$?
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else
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resolvectl domain "$ifindex" "" || resolvectl_failed=$?
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fi
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resolvectl dns "$ifindex" $DNS6 $DNS || resolvectl_failed=$?
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if [ "$DEFAULT_ROUTE" ]; then
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resolvectl default-route "$ifindex" $DEFAULT_ROUTE || resolvectl_failed=$?
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fi
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fi
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else
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rm -f "$statedir/$ifindex"
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if systemctl --quiet is-active systemd-resolved; then
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resolvectl revert "$ifindex" || resolvectl_failed=$?
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fi
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fi
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# resolved was running, but without dbus, it means state files
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# will not be read & resolvectl commands failed, restart it
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if [ "$resolvectl_failed" ]; then
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systemctl try-restart systemd-resolved
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fi
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fi
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rm -f "$oldstate" "$newstate"
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fi
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