#!/bin/sh
# This is the location of ./i2prouter
# If lib/i2ptunnel.jar not found please specifiy location, example: I2P="/home/user/apps/i2p"
I2P=""

if [ -z "$I2P" ]; then
    I2P="$(cd "$(dirname "$0")" && pwd)"
fi

    # Can we find the i2ptunnel.jar
if [ ! -f "$I2P/lib/i2ptunnel.jar" ]; then
    echo " ✖ File $I2P/lib/i2ptunnel.jar not found, edit $0 and change the I2P variable (normally the I2P+ application directory)"
    exit 1
fi

    # Show i2ping help with option for exit number
send_help() {
    java --enable-native-access=ALL-UNNAMED -jar "$I2P/lib/i2ptunnel.jar" -die -e "ownDest yes" -e "ping"
    if [ "$1" ]; then exit $1; else exit 0; fi
}

debug() {
    if [ "$debug" ]; then
        echo "DEBUG> : $@"
    fi
}

    # Is input empty?
if [ ! "$1" ]; then
    send_help
fi

    # Filter arguments
args=""
for a in $@; do
    case $a in
        -c) # -c (require 5 consecutive pings to report success)
            sec_five=true
            args="$args -c "
            shift
            ;;
        -d) # -d Enable debug output
            debug=true
            shift
            ;;
        -p) # -p toPort
            shift
            port_to=$(echo "scale=0; $1 + 0" | bc)
            if [ $port_to -lt 1 ] || [ $port_to -gt 65535 ]; then
                echo " ✖ Port range: to is wrong or missing, port tried $port_to"
                send_help 1
            fi
            args="$args -p $port_to "
            shift
            ;;
        -f) # -f fromPort
            shift
            port_from=$1
            if [ $port_from -le 0 ] || [ $port_from -ge 65536 ]; then
                echo " ✖ Port range: from is wrong or missing, port tried $port_from"
                send_help 1
            fi
            args="$args -f $port_from "
            shift
            ;;
        -h) # -h (pings all hosts in hosts.txt in current directory)
            host_file=./hosts.txt
            if [ ! -f $host_file ]; then
                echo " ✖ Required hosts file ./hosts.txt not found"
            fi
            args="$args -h"
            shift
            ;;
        -l) # -l <destlistfile> (pings a list of hosts in a file)
            shift
            list_file=$1
            if [ ! -f $list_file ]; then
                echo " ✖ File $list not found"
                send_help 1
            fi
            args="$args -l $list_file"
            shift
            ;;
        -m) # -m maxSimultaneousPings (default 16)
            shift
            max=$1
            args="$args -m $max"
            shift
            ;;
        -n) # -n numberOfPings (default 10)
            shift
            pings=$1
            args="$args -n $pings"
            shift
            ;;
        -t) # -t timeout (ms, default 8000)
            shift
            timeout=$1
            if [ $timeout -gt 0 ] && [ $timeout -lt 9 ]; then
                echo " ✖ Timeout is in milliseconds e.g. for 6 seconds: -t 6000"
                send_help 1
            fi
            args="$args -t $timeout"
            shift
            ;;
        --help)
            send_help
            shift
            ;;
        *)
            address="$1"
            ;;
    esac
done
if [ $host_file ] && [ $list_file ]; then
    echo " ✖ Unable to use -h and -l together"
    send_help 1
elif [ $host_file ] && [ -f $host_file ]; then
    echo " • Found $host_file, initiating ping..."
    debug "$(cat $host_file | wc -l) hosts to ping"
    echo " • Trying to open tunnel(s)"
    cmd='java --enable-native-access=ALL-UNNAMED -jar '"$I2P"'/lib/i2ptunnel.jar -die -e "ownDest yes" -e "ping '"${args}"'"'
    eval ${cmd}
    exit $?
elif [ $list_file ] && [ -f $list_file ]; then
    echo " • Found list file $list_file, initiating ping..."
    debug "$(cat $list_file | wc -l) hosts to ping"
    echo " • Trying to open tunnel(s)"
    cmd='java -jar '"$I2P"'/lib/i2ptunnel.jar -die -e "ownDest yes" -e "ping '"${args}"'"'
    eval ${cmd}
    exit $?
elif [ "$address" ]; then # Do we really have an address?

    # Check address type
    if [ $(echo $address | wc -c) -eq 525 ]; then
        debug "Address is B64 format"
        lookup=""
    elif [ "$(echo $address | grep -oiE 'b32.i2p$')" = 'b32.i2p' ] && [ $(echo $address | wc -c) -eq 61 ]; then
        debug "Address is b32.i2p format"
        lookup=""
    elif [ "$(echo $address | grep -ioE '.i2p$')" = '.i2p' ]; then
        debug "Address is .i2p format"
        lookup=""
    else
        echo " ✖ Address is an unknown format"
        send_help 1
    fi

    echo " ➤ Initiating ping of $address"

    # Try to resolve B64 address
    lookup=$(java -jar -Xms16m -Xmx16m $I2P/lib/i2ptunnel.jar -nocli -w -e "lookup ${address}" -d)
    if [ "$lookup" != "Unknown host: $address" ]; then
        echo " ✔ Found valid B64 address"
    fi

    # Start single ping command
    echo " • Opening tunnel..."
    cmd='java --enable-native-access=ALL-UNNAMED -jar '"$I2P"'/lib/i2ptunnel.jar -die -e "ownDest yes" -e "ping '"${args}"' '"${address}"'"'
    eval ${cmd} | while read line; do # Parse output
        filter="$(echo $line | grep ""$address"")" # Filter 1
        filter="$(echo $line | grep -iEo '[0-9]{1,99}\:|result')" # Filter 2
        if [ "$filter" ]; then # If fitler found echo the output
            echo " $line"
        else
            debug "Filter: $filter -- Output: $line"
        fi
    done
else
    echo " ✖ Missing address field"
    send_help 1
fi

exit 0
