isc-dhcp: send ddns updates to a remote Bind server
Signed-off-by: Jaymin Patel <jem.patel@gmail.com>
This commit is contained in:
Jaymin Patel
parent
a9ae9bad06
commit
ed877f6105
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@ -2,10 +2,18 @@
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uci -q get dhcp.isc_dhcpcd && exit 0
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touch /etc/config/dhcp
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[ -f /etc/bind/rndc.conf ] && key_secret=$(awk -F'"' '/secret/{print $2; exit;}' /etc/bind/rndc.conf)
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[ -z "$key_secret" ] && key_secret=$(rndc-confgen | awk -F'"' '/secret/{print $2; exit;}')
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uci batch <<EOF
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set dhcp.isc_dhcpd=isc_dhcpd
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set dhcp.isc_dhcpd.authoritative='1'
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set dhcp.isc_dhcpd.default_lease_time='3600'
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set dhcp.isc_dhcpd.max_lease_time='86400'
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set dhcp.dynamicdns=dynamicdns
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set dhcp.dynamicdns.server=127.0.0.1
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set dhcp.dynamicdns.key_algo=hmac-sha256
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set dhcp.dynamicdns.key_secret=$key_secret
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set dhcp.dynamicdns.key_name=local-dns
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commit dhcp
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EOF
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@ -116,11 +116,11 @@ typeof() {
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}
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update() {
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local lhs="$1" family="$2" type="$3"
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shift 3
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local lhs="$1" leasetime="$2" family="$3" type="$4"
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shift 4
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[ $dynamicdns -eq 1 ] && \
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echo -e "$PREFIX" "$lhs $family $type $@\nsend" >> $dyn_file
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echo -e "$PREFIX" "$lhs ${leasetime} $family $type $@\nsend" >> $dyn_file
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}
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rev_str() {
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@ -134,14 +134,99 @@ rev_str() {
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echo "$result"
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}
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create_empty_zone() {
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local zone="$1"
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create_zone_update_file() {
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local zone=$1
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local zonefile="$dyndir/db.$zone"
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if [ ! -f $dyndir/db."$zone" ]; then
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cp -p /etc/bind/db.empty $dyndir/db."$zone"
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chmod g+w $dyndir/db."$zone"
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chgrp bind $dyndir/db."$zone"
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cp -p /etc/bind/db.empty "$zonefile"
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cat <<EOF >> ${conf_local_file}_
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zone "$zone" {
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type master;
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file "$zonefile";
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update-policy {
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grant $session_key_name zonesub any;
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};
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};
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EOF
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}
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generate_dhcp_ddns_config() {
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local zone=$1
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local cfg=$2
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local server
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config_get server "$cfg" server
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cat <<EOF
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zone $zone. {
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primary $server;
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key $session_key_name;
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}
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EOF
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}
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generate_session_file() {
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local cfg=$1
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config_get session_key_name $cfg key_name local-dns
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config_get key_algo $cfg key_algo hmac-sha256
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config_get key_secret $cfg key_secret
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cat <<EOF > "$session_key_file"
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key "$session_key_name" {
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algorithm $key_algo;
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secret "$key_secret";
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};
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EOF
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}
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generate_ddns_config() {
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local domain=$1
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local cfg=dynamicdns
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local server zones
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local named_reload=0
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config_get server $cfg server
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config_get zones $cfg zones
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generate_session_file "$cfg"
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cat <<EOF
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ddns-domainname "$domain.";
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ddns-update-style standard;
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ddns-updates on;
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ignore client-updates;
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update-static-leases on;
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use-host-decl-names on;
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update-conflict-detection off;
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update-optimization off;
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include "$session_key_file";
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EOF
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config_list_foreach $cfg zones create_zone_update_file "$cfg"
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config_list_foreach $cfg zones generate_dhcp_ddns_config "$cfg"
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cmp -s $conf_local_file ${conf_local_file}_ || {
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named_reload=1
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cp ${conf_local_file}_ ${conf_local_file}
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}
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rm -f ${conf_local_file}_
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chmod g+w "$dyndir" -R
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chgrp bind "$dyndir" -R
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if [ "$named_reload" = "1" ]; then
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/etc/init.d/named reload
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sleep 1
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fi
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init_dynamicdns_config
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echo -e "server $server" >> $dyn_file
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echo -e "zone ${zones// /\\nzone }" >> $dyn_file
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}
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append_routes() {
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@ -210,7 +295,7 @@ static_cname_add() {
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config_get target "$cfg" "target"
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[ -n "$target" ] || return 0
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update "$cname.$domain." IN CNAME "$target.$domain."
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update "$cname.$domain." "" IN CNAME "$target.$domain."
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}
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static_cnames() {
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@ -230,9 +315,9 @@ static_domain_add() {
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for ip in $ips; do
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revip="$(rev_str "$ip" ".")"
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update "$name.$domain." IN A "$ip"
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update "$name.$domain." "" IN A "$ip"
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[ -n "$(rfc1918_prefix "$ip")" ] && \
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update "$revip.in-addr.arpa." IN PTR "$name.$domain."
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update "$revip.in-addr.arpa." "" IN PTR "$name.$domain."
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done
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}
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@ -252,9 +337,9 @@ static_mxhost_add() {
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[ -n "$pref" ] || return 0
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if [ "$domain2" = "@" ]; then
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update "$domain." IN MX "$pref" "$relay.$domain."
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update "$domain." "" IN MX "$pref" "$relay.$domain."
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else
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update "$domain2.$domain." IN MX "$pref" "$relay.$domain."
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update "$domain2.$domain." "" IN MX "$pref" "$relay.$domain."
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fi
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}
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@ -277,7 +362,7 @@ static_srvhost_add() {
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config_get weight "$cfg" "weight"
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[ -n "$weight" ] || return 0
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update "$srv.$domain." IN SRV "$priority" "$weight" "$port" "$target.$domain"
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update "$srv.$domain." "" IN SRV "$priority" "$weight" "$port" "$target.$domain"
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}
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static_srvhosts() {
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@ -377,8 +462,8 @@ static_host_add() {
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for ip in $ips; do
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revip="$(rev_str "$ip" ".")"
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update "$name.$domain." IN A "$ip"
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update "$revip.in-addr.arpa." IN PTR "$name.$domain."
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update "$name.$domain." "$leasetime" IN A "$ip"
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update "$revip.in-addr.arpa." "$leasetime" IN PTR "$name.$domain."
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done
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}
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@ -386,6 +471,14 @@ static_hosts() {
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config_foreach static_host_add host "$@"
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}
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init_dynamicdns_config() {
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cat <<EOF > $dyn_file
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; Generated by /etc/init.d/dhcpd at $(date)
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ttl $TTL
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EOF
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}
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gen_dhcp_subnet() {
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local cfg="$1"
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@ -517,82 +610,7 @@ general_config() {
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max_lease_time="$(time2seconds "$max_lease_time")"
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[ $? -ne 0 ] && return 1
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if [ $dynamicdns -eq 1 ]; then
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create_empty_zone "$domain"
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local mynet
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for mynet in $rfc1918_nets; do
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mynet="$(rev_str "$mynet" ".")"
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create_empty_zone "$mynet.in-addr.arpa"
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done
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local need_reload=
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cp -p $conf_local_file ${conf_local_file}_
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cat <<EOF > $conf_local_file
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zone "$domain" {
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type master;
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file "$dyndir/db.$domain";
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update-policy {
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grant $session_key_name zonesub any;
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};
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};
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EOF
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for mynet in $rfc1918_nets; do
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mynet="$(rev_str "$mynet" ".")"
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cat <<EOF >> $conf_local_file
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zone "$mynet.in-addr.arpa" {
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type master;
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file "$dyndir/db.$mynet.in-addr.arpa";
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update-policy {
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grant $session_key_name zonesub any;
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};
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};
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EOF
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done
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cmp -s $conf_local_file ${conf_local_file}_ || need_reload=1
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rm -f ${conf_local_file}_
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[ -n "$need_reload" ] && /etc/init.d/named reload
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sleep 1
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cat <<EOF
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ddns-domainname "$domain.";
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ddns-update-style standard;
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ddns-updates on;
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ignore client-updates;
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update-static-leases on;
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use-host-decl-names on;
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update-conflict-detection off;
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update-optimization off;
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include "$session_key_file";
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zone $domain. {
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primary 127.0.0.1;
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key $session_key_name;
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}
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EOF
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for mynet in $rfc1918_nets; do
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mynet="$(rev_str "$mynet" ".")"
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cat <<EOF
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zone $mynet.in-addr.arpa. {
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primary 127.0.0.1;
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key $session_key_name;
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}
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EOF
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done
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fi
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[ $dynamicdns -eq 1 ] && generate_ddns_config "$domain"
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if [ -n "$log_facility" ] ; then
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echo "log-facility $log_facility;"
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