Find the list of nodes to which I have access - so nodes which have my or someone's public key

ssh_counter.sh

#!/bin/bash
curl https://map.aachen.freifunk.net/data/meshviewer.json | jq -r '.nodes[].addresses[]' | grep 2a03:2260:3006:1 > ips.txt
IPS_FILE="ips.txt"
USER="root"

# myself
COMMAND="pretty-hostname"

# search fore someones pubkey in the authorized keys
COMMAND="grep -q 'AAAAB3Nxxx' /etc/dropbear/authorized_keys && pretty-hostname"

while read -r ip; do
  # 2>/dev/null hides "Permission denied", "Connection timed out", etc.
  ssh -n -o BatchMode=yes -o ConnectTimeout=3 -o StrictHostKeyChecking=no "$USER@$ip" \
  "$COMMAND" 2>/dev/null &
done < "$IPS_FILE"