scan for open tendermint rpcs

rpcscanner.bash

#!/bin/bash

# Required tools
command -v jq >/dev/null 2>&1 || { echo >&2 "jq is required but it's not installed.  Aborting."; exit 1; }
command -v curl >/dev/null 2>&1 || { echo >&2 "curl is required but it's not installed.  Aborting."; exit 1; }

# Fetch the chain.json file
chain_json_url="https://raw.githubusercontent.com/cosmos/chain-registry/master/neutron/chain.json"
chain_json=$(curl -s $chain_json_url)

# Extract the RPC URLs
rpcs=$(echo "$chain_json" | jq -r '.rpcs[]')

# Get the list of peers from the net_info endpoint
get_peers() {
    local url=$1
    local response=$(curl -s "$url/net_info")

    # Check if the response is a valid JSON
    if ! echo "$response" | jq empty >/dev/null 2>&1; then
        echo "Invalid response from $url"
        return 1
    fi

    # Try to extract peers
    local peers=$(echo "$response" | jq -r '.result.peers[].node_info.listen_addr')
    if [ $? -ne 0 ]; then
        echo "Failed to extract peers from $url"
        return 1
    fi

    echo "$peers"
}

# Check if the RPC port is open and returns a valid response for a given address
check_rpc() {
    local address=$1
    local url="http://$address/net_info"
    local response=$(curl -s "$url")

    # Check if the response is a valid JSON
    if ! echo "$response" | jq empty >/dev/null 2>&1; then
        return 1
    fi

    return 0
}

# Main script
main() {
    for rpc in $rpcs
    do
        local peers=$(get_peers $rpc)

        if [ $? -ne 0 ]; then
            continue
        fi

        for peer in $peers
        do
            # Split the address into IP and port
            local ip=$(echo "$peer" | cut -d ':' -f 1)
            local port=$(echo "$peer" | cut -d ':' -f 2)

            # If the IP doesn't start with 0 or 127 and the port is specified, use the address from rpc_address
            if [[ ! $ip =~ ^(0|127) ]] && [ -n "$port" ]; then
                if check_rpc $peer; then
                    echo "Valid RPC found at $peer"
                else
                    echo "Invalid RPC at $peer"
                fi
            else
                # Otherwise use the remote_ip and port 26657
                local default_port=26657
                local default_address="$ip:$default_port"
                if check_rpc $default_address; then
                    echo "Valid RPC found at $default_address"
                else
                    echo "Invalid RPC at $default_address"
                fi
            fi
        done
    done
}

main