dotfiles/bin/wpa-connect

#!/usr/bin/env bash

# wpa-connect.sh
# Dumb wpa_supplicant wrapper to connect to wifi or create a new wpa profile
# Depends on wpa_supplicant and iw
# 
# by x1phosura

# If the script fails, you can always run the following AS ROOT:
# wpa_supplicant -B -i wlp3s0 -c <(wpa_passphrase profile_name passphrase) # && dhcpcd

# wireless networking interface
wint="wlp4s0"

# where wpa_supplicant config files are stored on the system
wpa_conf_path="/etc/wpa_supplicant"
# list of profiles in the wpa_supplicant config path
# shellcheck disable=SC2012
profile_list="$(ls /etc/wpa_supplicant | sed 's/.conf//g')" # strips the conf

default="# to get the psk, do wpa_passphrase \\\"profile_name\\\" \\\"passphrase\\\"\n"

sudo_validate() {
    if [[ $(id -u) != 0 ]]; then  # if not already root
        sudo -v
    fi
}

print_usage() {
    echo -ne \
        "Usage: "$(basename $0)" [ -dshln ] [ -c profile_name ]\n\n" \
        "Options:\n" \
        "-d --disconnect\n" \
        "    Kill current wpa_supplicant process and disconnect\n" \
        "-s --scan\n" \
        "    Scan for and list nearby SSIDS\n" \
        "-h --help\n" \
        "    Displau this message\n" \
        "-l --list --list-profiles\n" \
        "    List current available WPA/2 profiles\n" \
        "-n --new\n" \
        "    Create a new wpa_supplicant profile (BETA feature)\n" \
        "-c --connect [profile_name]\n" \
        "    Connect to the provided WPA/2 profile 'profile_name'\n"
}

make_new_wpa_profile() {
    printf "BETA feature!: Currently assumes a basic home WPA/2 setup (just "
    printf "requires a password to log in).\n"
    echo "Enter the config file's name (usually NetworkName.conf): "
    read wpa_profile_name
    echo "Enter the network's name (SSID) unescaped: "
    read ssid
    echo "Does the network need a password (PSK)? [y/N]: "
    read has_psk

    sudo_validate
    sudo touch "$wpa_conf_path"/"$wpa_profile_name"

    if [[ "$has_psk" != "" && $(printf "${has_psk:0:1}" | tr Y y) = "y" ]] ; then
        echo "Enter the network's password (psk): "
        read pass
        sudo sh -c "echo -e \"$default\" > \"$wpa_conf_path\"/\"$wpa_profile_name\""
        sudo sh -c "wpa_passphrase \"$ssid\" \"$pass\" >> \"$wpa_conf_path\"/\"$wpa_profile_name\""
        sudo sh -c "chmod 660 \"$wpa_conf_path\"/\"$wpa_profile_name\""
    else                # else unsecured network, connect with no password
        sudo sh -c "cat > \"$wpa_conf_path\"/\"$wpa_profile_name\" << EOF
network={
        ssid=\"$ssid\"
        key_mgmt=NONE
}
EOF"
    fi

    echo "Profile made. Would you like to connect to your new profile? [y/N]"
    read connect_new

    if [[ "$connect_new" != "" && $(printf "${connect_new:0:1}" | tr Y y) = "y" ]]
    then
        profile=$(printf "$wpa_profile_name" | sed 's/.conf//g') # get profile
        connect_to_profile
    fi
}

connect_to_profile() {
    sudo_validate

    [ "$(pgrep wpa_supplicant)" != "" ] && sudo killall wpa_supplicant
    sleep 1  # necessary for some reason, I forget why

    #systemctl stop {wicd,netctl} && \
    sudo wpa_supplicant -B -i "$wint" -c /etc/wpa_supplicant/"$profile".conf
    # sudo dhcpcd "$wint"  # needed if systemd dhcpcd service not used
}


profile=""

if [ $# -lt 1 ] ; then      # if less than 1 argument (no args) provided...
    print_usage ; exit 1
fi

while [[ "$#" -gt 0 ]]; do
    case $1 in
        -d|--disconnect)
            sudo_validate
            sudo killall wpa_supplicant ; break ;;
        -s|--scan)
            sudo_validate
            # Note: `iw dev $wint scan | less` gives more verbose info in output
            sudo iw dev $wint scan | grep 'SSID: ' \
                                   | sed -E 's/[[:space:]]+SSID: //g'
            break ;;
        -h|--help)
            print_usage ; break ;;
        -l|--list|--list-profiles)
            printf "%s\n\n%s\n\n" \
                "Current profiles to choose from:" \
                "$profile_list " ; break ;;
        -n|--new)
            sudo_validate
            make_new_wpa_profile        # create a new wpa_supplicant profile
            break ;;
        -c|--connect)
            profile="$2"
            if [ "$profile" = "" ]; then
                echo -ne "$(basename $0): -c, --connect takes an argument " \
                                                       "'profile_name'\n\n"
                print_usage
            else
                sudo_validate
                connect_to_profile      # connect to existing profile
            fi
            shift
            break ;;
        *)
            print_usage ; exit 1 ;;
    esac
    shift
done