Min Soe Han

dashinet

DATE 20240729

This is a single dash script to manage WiFi Connections. It can connect to new WiFi and can manage known connections such as activating, deactivating, deleting, checking password of a ever connected (known) connection.

#!/bin/dash

# test if it is running as ROOT and exit.
if [ $(($(id -u))) -eq 0 ]; then
    exit 0
fi
# test if it is running in terminal or exit.
case "$(ps -o stat= -p $$)" in
    *+*) echo "continue..." ;;
    *) notify-send -t 2700 "clean exit" "please run it in terminal."; exit 0 ;;
esac
# test if it is already running or exit.
SCRIPTNAME="$(basename -- $0)"
if pidof -x "$SCRIPTNAME" -o $$ > /dev/null 2>&1; then
    echo "the script is already running. clean exit."
    exit 0
fi
# test if nmcli command is available or exit
if ! which nmcli > /dev/null 2>&1; then
    echo "nmcli command is NOT available. install NetworkManager first. clean exit."
    exit 0
fi
##### pre testing ends here #####

# correct number and select
correcnumselected_func () {
    echo; echo "$NUMWCLIST" | cut -d '_' -f 1,3-; echo
    unset CORRECNUM
    while true; do
        read -p "[e:exit|q:quit] [b:back|r:reverse] [Number]: " SELNUM
        case "$SELNUM" in
            [0-9]|[0-9][0-9]) CORRECNUM=$(printf "%03d" "$SELNUM") ;;
            [0-9][0-9][0-9]) CORRECNUM=$SELNUM ;;
            e|exit|q|quit) exit 0 ;;
            b|back|r|reverse) SKIPNEXT=1; GROUPLOOP=0; break ;;
            *) echo "Oop! invalid selection. try again."; continue ;;
        esac
        SELECLINE=$(echo "$NUMWCLIST" | grep "^$CORRECNUM" | cut -d '_' -f 1,3-)
        if [ -z "$SELECLINE" ]; then
            echo "Oop! selection is empty. try again."
            continue
        fi
        SELECTED=$(echo "$NUMWCLIST" | grep "^$CORRECNUM" | cut -d '_' -f 2)
        break
    done
}

########## AVAILABLE WIFI ##########
# list available wifi
listavailablewifi_func () {
    local FIELDS="BSSID,SSID,BARS,SECURITY,IN-USE"
    local WIFIRAW=$(nmcli --fields "$FIELDS" device wifi list | tail -n +2 | tr ' ' '_')
    unset NUMWCLIST
    local NUM=1
    NUMWCLIST=$(for AVWIFI in $WIFIRAW; do
        local ZLNUM=$(printf "%03d" "$NUM")
        echo ""$ZLNUM"_"$AVWIFI""
        local NUM=$((NUM+1))
    done)
}
# connect selected wifi
connectwifi_func () {

    if [ $((SKIPNEXT)) -eq 1 ]; then
        SKIPNEXT=0
        return
    fi

    echo; echo "$SELECLINE"; echo

    local FAILED=0
    while true; do
        echo "Type WiFi Password or Leave it Blank if NOT Required."
        stty -echo; echo -n "Password or Blank: "; read WIFIPASS; stty echo; echo
        if [ -z "$WIFIPASS" ]; then
            nmcli device wifi connect "$SELECTED"
        else
            nmcli device wifi connect "$SELECTED" password "$WIFIPASS"
        fi

        if [ $(($?)) -eq 0 ]; then
            break
        fi

        read -p "[A:again] [r:reselect] [s:stop] [e:exit]: " ARSE
        case "$ARSE" in
            r|res|reselect) GROUPLOOP=1; break ;;
            s|stop) break ;;
            e|exit) exit 0 ;;
            *) continue ;;
        esac
    done
}
# list available wifi, correct number, select and connect selected wifi
# wifi functions group loop
wifigrouploop_func () {
    nmcli device wifi rescan
    while true; do
        listavailablewifi_func
        correcnumselected_func
        connectwifi_func
        if [ $((GROUPLOOP)) -eq 1 ]; then
            GROUPLOOP=0
            continue
        fi
        break
    done
}

########## KNOWN CONNECTIONS ##########
# list known connections
listconnections_func () {
    local FIELDS="UUID,NAME,TYPE,DEVICE"
    local CONNRAW=$(nmcli --fields "$FIELDS" connection show | tail -n +2 | tr ' ' '_')
    unset NUMWCLIST
    local NUM=1
    NUMWCLIST=$(for CONN in $CONNRAW; do
        local ZLNUM=$(printf "%03d" "$NUM")
        echo ""$ZLNUM"_"$CONN""
        local NUM=$((NUM+1))
    done)
}
# connection operations
connectionoperations_func () {

    if [ $((SKIPNEXT)) -eq 1 ]; then
        SKIPNEXT=0
        return
    fi

    GROUPLOOP=0

    while true; do
        echo "
        a -> Activate
        d -> Deactivate
        r -> Remove/Delete
        c -> Check Password
        s -> Reselect Connection
        b -> Restart
        e -> Exit [or] q -> Quit
        "
        echo "selected:"; echo "$SELECLINE"; echo
        read -p "Select Character: " SELCHAR
        case "$SELCHAR" in
            a) nmcli connection up "$SELECTED" ;;
            d) nmcli connection down "$SELECTED" ;;
            r) nmcli connection delete "$SELECTED"; GROUPLOOP=1 ;;
            c) nmcli --show-secrets connection show "$SELECTED" | grep "security.psk:"; GROUPLOOP=1 ;;
            s) echo "reslect connection..."; GROUPLOOP=1 ;;
            b) echo "restart..." ;;
            e|exit|q|quit) exit 0 ;;
            *) echo "Oop! invalid selection. try again."; continue ;;
        esac
        break
    done
}
# list known connections, correct number, select and do operations
# connection functions group loop
connectiongrouploop_func () {
    while true; do
        listconnections_func
        correcnumselected_func
        connectionoperations_func
        if [ $((GROUPLOOP)) -eq 1 ]; then
            continue
        fi
        break
    done
}

# main while loop
while true; do
    echo "
    w -> Available WiFi
    c -> Known Connections
    k -> Check Current Password
    r -> Rescan WiFi
    e -> Exit [or] q -> Quit
    "
    read -p "Select Character: " SELCHAR
    case "$SELCHAR" in
        w) wifigrouploop_func ;;
        c) connectiongrouploop_func ;;
        k) nmcli device wifi show-password ;;
        r) nmcli device wifi rescan ;;
        e|exit|q|quit) exit 0 ;;
        *) echo "Oop! invalid selection. try again." ;;
    esac
    continue
done
            

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