shark-files/usr/bin/shark_framework

#!/bin/bash

LOG="logger -t Shark [*]"
LOG_ERR="logger -t Shark -p 3 [!]"

MODE="OFF"
SWITCH_POSITION=$(/usr/bin/SWITCH)

function upgrade_leds() {
    /usr/bin/LED OFF
    while true
    do
        echo 1 > /sys/class/leds/shark:red:system/brightness
        sleep 0.2
        echo 0 > /sys/class/leds/shark:red:system/brightness
        echo 1 > /sys/class/leds/shark:blue:system/brightness
        sleep 0.2
        echo 0 > /sys/class/leds/shark:blue:system/brightness
    done
}

# $1: Upgrade file
# $2: MD5 file
# $3: Upgrade file size in bytes
function extract_md5() {
    dd if=$1 of=$2 skip=$3 bs=1 count=33
}

# $1: Upgrade file
# $2: MD5 file
function verify_md5() {
    expected=$(cat $2)
    checksum=$(md5sum $1 | awk '{print $1}')
    [[ $expected = $checksum ]] && {
        return 0
    }
    return 1
}

# $1: Upgrade file
# $2: Upgrade file size in bytes
function truncate_upgrade() {
    dd if=/dev/null of=$1 bs=1 seek=$2
}

function execute_upgrade() {
    # Check for upgrade file in default location
    $LOG "Checking for firmware upgrade"
    upgrade_file=$(ls /root/upgrade-*.bin 2>/dev/null | tail -n1)

    [[ -f $upgrade_file ]] && {
        # Upgrade file found
        $LOG "Firmware upgrade found"

        $LOG "Verifying firmware upgrade"
        upgrade_file_size=$(( $(ls -l $upgrade_file | awk '{print $5}') - 33 ))

        # Extract md5sum from upgrade file
        extract_md5 $upgrade_file /tmp/upgrade.md5 $upgrade_file_size

        cp $upgrade_file /tmp/upgrade.bin
        truncate_upgrade /tmp/upgrade.bin $upgrade_file_size

        # Verify upgrade file
        verify_md5 /tmp/upgrade.bin /tmp/upgrade.md5 || {
            # Upgrade file not verified; exit
            $LOG "Firmware upgrade not verified. File may be corrupt"
            LED FAIL &
            return 1
        }
        $LOG "Firmware upgrade verified"
        LED OFF && LED SUCCESS

        # Check battery state first
        $LOG "Checking device power state"
        battery_state=$(/usr/bin/BATTERY)
        [[ $battery_state = "discharging" ]] && {
            # Device is not plugged in
            $LOG "Device is not powered. Do not attempt firmware upgrade"
            return 1
        }
        $LOG "Device is powered"

        # Remove upgrade file
        rm -rf $upgrade_file
        sync

        # Upgrade file verified; run upgrade
        $LOG "Executing UPGRADE"
        sleep 2 && upgrade_leds &
        echo "sysupgrade -n /tmp/upgrade.bin" | at now

        exit
    } || {
        # Upgrade file not found; enter arming mode
        $LOG "Firmware upgrade not found"
        return 1
    }
}

function execute_payload() {
    $LOG "Executing PAYLOAD"

    if [ ! -d /root/loot ]; then
        mkdir -p /root/loot;
    fi

    payload_path="/root/payload"
    payload=$(ls $payload_path/payload* 2>/dev/null | tail -n1)

    case $(basename $payload) in
        "payload.py")
            echo "python $payload &> /dev/null" | at now
            ;;
        "payload.php")
            echo "php-cli $payload &> /dev/null" | at now
            ;;
        "payload" | "payload.sh" | "payload.txt")
            sed -i 's/\r//g' $payload
            echo "bash -C '$payload'" | at now
            ;;
        *)
            /usr/bin/LED FAIL
            ;;
    esac
}

function configure_network() {
    cp /usr/lib/config/${SWITCH_POSITION}/network /etc/config/network
    /etc/init.d/network restart
}

function start_http() {
    /etc/init.d/uhttpd start
}

function stop_http() {
    /etc/init.d/uhttpd stop
}

function start_ssh() {
    /etc/init.d/sshd start
}

function stop_ssh() {
    /etc/init.d/sshd stop
}

function enter_attack_mode() {
    $LOG "Entering ATTACK mode"
    MODE="ATTACK"
    /usr/bin/LED OFF

    configure_network
    stop_http
    stop_ssh

    execute_payload

    enter_idle_mode
}

function enter_arming_mode() {
    $LOG "Entering ARMING mode"
    MODE="ARMING"
    /usr/bin/LED OFF

    configure_network
    start_http
    start_ssh

    enter_idle_mode
}

function enter_off_mode() {
    $LOG "Entering OFF mode"
    MODE="OFF"
    /usr/bin/LED OFF

    stop_http
    stop_ssh

    enter_idle_mode
}

function enter_idle_mode() {
    $LOG "Entering IDLE mode"
    while true
    do
        if [[ $MODE = "ARMING" ]] || [[ $MODE = "OFF" ]]; then
            BATTERY_STATE=$(/usr/bin/BATTERY)
            case $BATTERY_STATE in
                "charging")
                    /usr/bin/LED B SLOW
                    ;;
                "full")
                    /usr/bin/LED B
                    ;;
                *)
                    /usr/bin/LED Y SLOW
                    if [[ $MODE = "OFF" ]]; then
                        sleep 2 && halt
                    fi
                    ;;
            esac
        fi

        SWITCH_POSITION=$(/usr/bin/SWITCH)
        case $SWITCH_POSITION in
            "switch3")
                if [[ $MODE != "ATTACK" ]]; then
                    enter_attack_mode
                fi
                ;;
            "switch2")
                if [[ $MODE != "ARMING" ]]; then
                    execute_upgrade || enter_arming_mode
                fi
                ;;
            *)
                if [[ $MODE != "OFF" ]]; then
                    enter_off_mode
                fi
                ;;
        esac
        sleep 1
    done
}


function run() {
    case $SWITCH_POSITION in
        "switch3")
            enter_attack_mode
            ;;
        "switch2")
            execute_upgrade || enter_arming_mode
            ;;
        *)
            enter_off_mode
            ;;
    esac
}


# Start framework after a short wait
sleep 2
run &> /dev/null &