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# Prerequisites
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*.d
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# Object files
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*.o
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*.ko
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*.obj
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*.elf
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# Linker output
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*.ilk
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*.map
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*.exp
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# Precompiled Headers
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*.gch
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*.pch
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# Libraries
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*.lib
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*.a
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*.la
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*.lo
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# Shared objects (inc. Windows DLLs)
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*.dll
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*.so
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*.so.*
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*.dylib
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# Executables
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*.exe
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*.out
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*.app
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*.i*86
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*.x86_64
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*.hex
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# Debug files
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*.dSYM/
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*.su
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*.idb
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*.pdb
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# Kernel Module Compile Results
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*.mod*
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*.cmd
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.tmp_versions/
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modules.order
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Module.symvers
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Mkfile.old
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dkms.conf
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@ -16,5 +16,4 @@ RUN setcap cap_net_raw=+ep /bin/mdns-repeater
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COPY run.sh /app/
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RUN chmod +x /app/run.sh
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ENTRYPOINT ["/app/run.sh"]
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CMD ["/bin/mdns-repeater", "-f", "eth0.20", "eth0.100"]
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ENTRYPOINT /app/run.sh "${VLANS}"
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16
README.md
16
README.md
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@ -1,8 +1,10 @@
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# docker-mdns-repeater-mikrotik
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Save Image as Tar.gz
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```bash
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docker save registry.mgrote.net/mdns-repeater-mikrotik:latest -o ./mdns-repeater-mikrotik:latest.tgz
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# How to build the container
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To build the container make the script executable `chmod +x ./build_image.sh` and run it with one of the desired architectures as first parameter
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```
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sudo ./build_image.sh [x86|arm|arm64]
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```
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If you want to build the container for a platform different to your current run this once before building
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```
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sudo docker run --privileged --rm docker/binfmt:a7996909642ee92942dcd6cff44b9b95f08dad64
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```
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The final images are places in the `images` subfolder in the build directory.
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#!/bin/bash
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usage(){
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echo -e "Usage:\n\t$0 [arm|arm64|x86]"
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exit 1
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}
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if [[ -z "$1" ]]; then
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usage
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fi
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ARCH=${1,,}
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[[ -d ./images ]] || mkdir ./images
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case $ARCH in
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arm)
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sudo docker buildx build --no-cache --platform linux/arm/v6 -t mdns .
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sudo docker save mdns -o ./images/mdns_arm32.tar
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;;
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arm64)
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sudo docker buildx build --no-cache --platform linux/arm64 -t mdns .
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sudo docker save mdns -o ./images/mdns_arm64.tar
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;;
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x86)
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sudo docker buildx build --no-cache --platform linux/amd64 -t mdns .
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sudo docker save mdns -o ./images/mdns_x86.tar
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;;
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*)
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usage
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;;
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esac
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{
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# name of bridge to add veth interface to
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:local BRIDGENAME "bridgeLocal"
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# name the veth interface will get
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:local VETHNAME "mDNSTrunk"
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# set hostname of container
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:local HOSTNAME "mDNS"
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# set vlan-ids to reflect traffic between
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:local VLANS {100;200}
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# define image filename
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:local IMAGENAME "mdns_x86.tar"
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# path to data root for the container
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:local CONTAINERROOT "docker/container/mdns_repeater"
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# -------------------------------
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# variable holds all vlans seperated by spaces
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:local ALLVLANS ""
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# check bridge existance
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:if ([:len [/interface bridge find name="$BRIDGENAME"]] = 0) do={
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:put "Could not find a bridge with name '$BRIDGENAME' !"
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:quit
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}
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# add veth interface
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:if ([:len [/interface veth find name="$VETHNAME"]] = 0) do={
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# add veth interface
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/interface veth add address=172.19.19.2/24 gateway=172.19.19.1 name=$VETHNAME
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}
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# add veth interface to bridge
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:if ([:len [/interface bridge port find interface=$VETHNAME]] = 0) do={
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/interface bridge port add interface=$VETHNAME bridge=$BRIDGENAME
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}
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# for each vlan id
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:foreach id in=$VLANS do={
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# find existing vlan entry
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:local vlanentry [/interface bridge vlan find vlan-ids ~ "(^|;)$id(;|\$)" and bridge=$BRIDGENAME]
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:if ([:len $vlanentry] = 0) do={
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# if entry does not exist add it to vlan list
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/interface bridge vlan add bridge=$BRIDGENAME tagged="$BRIDGENAME,$VETHNAME" vlan-ids=$id
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} else={
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# if entry exists and veth interface is not a tagged member append veth interface to vlan as tagged interface
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:if ([:len [/interface bridge vlan find vlan-ids=$id and current-tagged ~ "$VETHNAME"]] = 0) do={
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/interface bridge vlan set $vlanentry tagged=([get $vlanentry tagged],"$VETHNAME")
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}
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}
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# build ALLVLAN variable
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:if ($ALLVLANS != "") do={
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:set ALLVLANS ($ALLVLANS . " " . $id)
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} else={
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:set ALLVLANS $id
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}
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}
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# add container environment variable wich defines the vlans used
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:if ([:len [/container envs find name=mdns key=VLANS]] = 0) do={
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/container envs add name=mdns key=VLANS value=$ALLVLANS
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}
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# finally add container
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:if ([:len [/container find root-dir="$CONTAINERROOT"]] = 0) do={
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/container add file=$IMAGENAME envlist=mdns logging=yes start-on-boot=yes root-dir="$CONTAINERROOT" interface=$VETHNAME hostname=$HOSTNAME
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} else={
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:put "Container already exists, please delete it beforehand and run again!"
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}
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}
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65
run.sh
65
run.sh
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#!/bin/bash
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# Exit on error
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# on error exit
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set -e
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# set vlan parent interface
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INTERFACE=eth0
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# assign vlan ids via commandline parameter 1
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VLANS=$1
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if [[ -z "$VLANS" ]];then
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echo -e "No VLAN-IDs assigned through environment variable with name 'VLANS'!\nExit container."
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exit 1
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fi
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# build interface list with parent interface and vlan ids
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ALLVLANIF=$(echo -n $VLANS | sed -re "s/\b([0-9]+)/${INTERFACE}.\1/g")
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HOSTNAME="mDns"
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INTERFACE="eth0"
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VLANS="20 100"
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# get MTU of parent interface
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MTU=$(ip link show $INTERFACE | grep -Ei 'mtu \d+' | cut -d " " -f2)
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MTU=$(ip link show "$INTERFACE" | awk '{print $5}')
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for VLAN in $VLANS; do
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# INTERFACE PROVISION
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IFNAME="${INTERFACE}.${VLAN}"
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[ ! -d "/sys/class/net/${IFNAME}" ] && {
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echo "create interface ${IFNAME}"
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ip link add link "$INTERFACE" name "$IFNAME" mtu "$MTU" type vlan id "$VLAN"
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}
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echo "bring up ${IFNAME} interface"
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ip link set "${IFNAME}" up
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# DHCP
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[ -f "/var/run/udhcpc.${IFNAME}.pid" ] && {
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kill "$(cat "/var/run/udhcpc.$IFNAME.pid")" || true
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rm "/var/run/udhcpc.$IFNAME.pid"
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}
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echo "starting dhcp client on ${IFNAME}"
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udhcpc -b -i "$IFNAME" -x hostname:"$HOSTNAME" -p "/var/run/udhcpc.${IFNAME}.pid"
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# cleanup non used vlan interfaces
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for VLAN in $(ls -1 /sys/class/net | grep -E "^${INTERFACE}\\." | grep -Ev "$(echo $ALLVLANIF | tr ' ' '|')") ;do
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echo "Deleting orphaned interface: $VLAN"
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ip link delete $VLAN
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done
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exec "$@"
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# for each vlan id
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for VLAN in $VLANS; do
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VLANIF="${INTERFACE}.$VLAN"
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# create vlan interface
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[[ ! -d "/sys/class/net/${VLANIF}" ]] && {
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echo "Creating interface ${VLANIF}"
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ip link add link $INTERFACE name "$VLANIF" mtu $MTU type vlan id $VLAN
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}
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echo "Bring up $VLANIF interface"
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ip link set "$VLANIF" up
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# starting DHCP client on interface
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[[ -f "/var/run/udhcpc.${VLANIF}.pid" ]] && {
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kill "$(cat "/var/run/udhcpc.${VLANIF}.pid")" >/dev/null
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rm "/var/run/udhcpc.${VLANIF}.pid"
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}
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echo "Starting dhcp client on ${VLANIF}"
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udhcpc -b -i $VLANIF -x hostname:"$HOSTNAME" -p "/var/run/udhcpc.${VLANIF}.pid"
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done
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echo "Starting mDNS repeater process ... "
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# run repeater on vlan interfaces
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exec /bin/mdns-repeater -f $ALLVLANIF
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