Automatically login through the captive portal (as used by Handlery Union Square Hotel SFO)

hotel-wifi.sh

#!/bin/sh
# Automates login.

# TODO fill this in (free Wi-Fi account)
FIRSTNAME=...
LASTNAME=...
ROOM=123

do_curl() {
    #gwaddr=$(ip route show default dev wlan0 | awk '/via/{print $3}')
    #if ! [[ "$gwaddr" =~ ^[0-9.]+$ ]]; then
    #    echo "Invalid IP found: '$gwaddr', failing!"
    #    return 1
    #fi
    gwaddr=4.2.2.1
    curl -A Mozilla/5.0 \
        --resolve login.globalsuite.net:80:$gwaddr \
        "$@"
}

process_login() {
    do_curl -so /dev/null \
        http://login.globalsuite.net/v2/globalnet/ProcessLogin \
        -d firstname="$FIRSTNAME" \
        -d lastname="$LASTNAME" \
        -d companyname="$ROOM" \
        -d option=0 \
        -d package-value-0=0.00
}

do_login() {
    do_curl -so /dev/null \
        http://login.globalsuite.net/v2/nonscript/StartSession \
        -d accept-submit=I+Accept \
        -d lang=

    process_login
}

do_renew() {
    # Renew followed by Process
    do_curl -so /dev/null \
        http://login.globalsuite.net/v2/globalnet/RenewLogin \
        -d ''

    process_login
}

do_logoff() {
    # Log off when done (warning: will result in ArrayIndexOufOfBoundsException on
    # server when invoking twice...). Oh, and also vulnerable to CSRF WTF.
    do_curl \
        http://login.globalsuite.net/v2/Logoff?confirm=true
}

get_time() {
    secs=$(do_curl -s \
        http://login.globalsuite.net/v2/InitPage |
        grep -Po 'timer-value#_#AJAX#_#\K\d+' -m1)
    if ! [[ $secs =~ ^[0-9]+$ ]]; then
        echo "Unknown expirity: '$secs'"
        return 2
    fi

    printf "Remaining time: %02d:%02d:%02d\n" \
        $((secs/3600)) \
        $((secs/60%60)) \
        $((secs%60))
    # Fail if it expires too fast.
    [[ $secs -ge $((3600*12)) ]]
}

get_time
case $? in
0)  # Up-to-date
    echo "No need to renew"
    ;;
1)  # Too old
    echo "Trying to renew"
    do_renew
    get_time
    ;;
2)  # Not logged in
    echo "Trying to login..."
    do_login
    get_time
    ;;
esac