Create multiple meshnetworks config using wireguard

generateMeshWireguardConfig.sh

#!/bin/bash
declare -a meshnetworks
declare -A hosts
declare -A wg_port
declare -A wg_subnet

configdir="/tmp/wireguard"
sshport=21
meshnetworks=("net1" "net2" "net3")
wg_port[net1]=1655
wg_subnet[net1]=10.10.10.
wg_port[net2]=1656
wg_subnet[net2]=10.10.11.
wg_port[net3]=1657
wg_subnet[net3]=10.10.12.
hosts[host1]=1
hosts[host2]=2
hosts[host3]=3

mkdir ${configdir}
hostnames=(${!hosts[@]})
hostname_len=${#hostnames[@]}
for meshnetwork in ${meshnetworks[@]}
do
    for (( i=0; i<${hostname_len}; i++ ))
    do
        wg genkey | tee ${configdir}/${meshnetwork}_private_${hostnames[i]} | wg pubkey > ${configdir}/${meshnetwork}_public_${hostnames[i]}
        cat << EOF > ${configdir}/${meshnetwork}_${hostnames[i]}.conf
# ${meshnetwork} ${hostnames[i]} ${wg_subnet[${meshnetwork}]}${hosts[${hostnames[i]}]}
[Interface]
PrivateKey = `cat ${configdir}/${meshnetwork}_private_${hostnames[i]}`
ListenPort = ${wg_port[${meshnetwork}]}

EOF
    done
    for (( i=0; i<${hostname_len}; i++ ))
    do
        for (( j=i+1; j<${hostname_len}; j++ ))
        do
            wg genpsk > ${configdir}/${meshnetwork}_presharedkey_${hostnames[i]}_${hostnames[j]}
            cat << EOF >> ${configdir}/${meshnetwork}_${hostnames[i]}.conf
# ${meshnetwork} ${hostnames[j]} ${wg_subnet[${meshnetwork}]}${hosts[${hostnames[j]}]}
[Peer]
PublicKey = `cat ${configdir}/${meshnetwork}_public_${hostnames[j]}`
AllowedIPs = ${wg_subnet[${meshnetwork}]}${hosts[${hostnames[j]}]}
Endpoint = `dig ${hostnames[j]} +short`:${wg_port[${meshnetwork}]}
PresharedKey = `cat ${configdir}/${meshnetwork}_presharedkey_${hostnames[i]}_${hostnames[j]}`
PersistentKeepalive = 25

EOF
            cat << EOF >> ${configdir}/${meshnetwork}_${hostnames[j]}.conf
# ${meshnetwork} ${hostnames[i]} ${wg_subnet[${meshnetwork}]}${hosts[${hostnames[i]}]}
[Peer]
PublicKey = `cat ${configdir}/${meshnetwork}_public_${hostnames[i]}`
AllowedIPs = ${wg_subnet[${meshnetwork}]}${hosts[${hostnames[i]}]}
Endpoint = `dig ${hostnames[i]} +short`:${wg_port[${meshnetwork}]}
PresharedKey = `cat ${configdir}/${meshnetwork}_presharedkey_${hostnames[i]}_${hostnames[j]}`
PersistentKeepalive = 25

EOF
        done
    done
    for host in ${!hosts[@]}
    do
        cat << EOF >> ${configdir}/interface_${meshnetwork}_${host}.conf
auto ${meshnetwork}
iface ${meshnetwork} inet static
        address ${wg_subnet[${meshnetwork}]}${hosts[${host}]}/24
        pre-up ip link add dev ${meshnetwork} type wireguard
        pre-up wg setconf ${meshnetwork} /etc/wireguard/${meshnetwork}.conf
        post-down ip link del ${meshnetwork}
        mtu 1280
EOF
    done
    chmod 0600 *
    for host in ${!hosts[@]}
    do
        scp -o StrictHostKeyChecking=accept-new -p -P ${sshport} ${configdir}/${meshnetwork}_${host}.conf root@${host}:/etc/wireguard/${meshnetwork}.conf
        scp -o StrictHostKeyChecking=accept-new -p -P ${sshport} ${configdir}/interface_${meshnetwork}_${host}.conf root@${host}:/tmp/${meshnetwork}.conf
        ssh -o StrictHostKeyChecking=accept-new root@${host} "cat /tmp/${meshnetwork}.conf >> /etc/network/interfaces"
    done
done
rm -rf ${configdir}