captive_portal-check/99-captive-portal

#!/usr/bin/env bash

# =============================================================================
# NetworkManager Captive Portal Auto-Detector
# =============================================================================
# Erstellt von Pascal Bouquet am 16.09.2025
# Aktualisiert am 17.09.2025
#
# Dieses Skript ist freie Software: Es kann frei verwendet, bearbeitet und 
# verbreitet werden. Es wird keine Garantie für die Funktionsfähigekeit übernommen.
# =============================================================================

# =============================================================================
# KONFIGURATION
# =============================================================================
LOG_FILE="/var/log/nm-captive.log"
LOG_LEVEL="INFO"  # NONE, DEBUG, INFO, WARNING, ERROR
CHECK_INTERVAL=300  # 5 Minuten in Sekunden
MAX_CHECKS=48       # Maximal 4 Stunde lang prüfen (48 * 5min)

# Test-URLs für Captive Portal Erkennung
TEST_URLS=(
    "http://captive.apple.com/hotspot-detect.html"
    "http://connectivitycheck.gstatic.com/generate_204"
)

# =============================================================================
# FUNKTIONEN
# =============================================================================

log() {
    local level=$1
    local message=$2
    
    # Kein Logging wenn LOG_LEVEL=NONE
    if [ "$LOG_LEVEL" = "NONE" ]; then
        return
    fi
    
    # Log-Level Filterung
    case $LOG_LEVEL in
        "DEBUG") echo "$(date '+%Y-%m-%d %H:%M:%S') - $level - $message" >> "$LOG_FILE" ;;
        "INFO") 
            if [[ "$level" != "DEBUG" ]]; then
                echo "$(date '+%Y-%m-%d %H:%M:%S') - $level - $message" >> "$LOG_FILE"
            fi
            ;;
        "WARNING")
            if [[ "$level" == "WARNING" || "$level" == "ERROR" ]]; then
                echo "$(date '+%Y-%m-%d %H:%M:%S') - $level - $message" >> "$LOG_FILE"
            fi
            ;;
        "ERROR")
            if [[ "$level" == "ERROR" ]]; then
                echo "$(date '+%Y-%m-%d %H:%M:%S') - $level - $message" >> "$LOG_FILE"
            fi
            ;;
    esac
}

check_captive_portal() {
    local captive_detected=false
    
    for url in "${TEST_URLS[@]}"; do
        log "DEBUG" "Testing URL: $url"
        
        if [[ "$url" == *"apple.com"* ]]; then
            # Apple Check: Erwartet "Success" in der Response
            local response=$(curl -s -L --connect-timeout 5 "$url")
            if [ $? -ne 0 ]; then
                log "DEBUG" "Network error for $url"
                captive_detected=true
                break
            elif ! echo "$response" | grep -qi "success"; then
                log "DEBUG" "Apple check failed - no 'Success' in response"
                captive_detected=true
                break
            fi
            
        elif [[ "$url" == *"google"* || "$url" == *"gstatic"* ]]; then
            # Google Check: Erwartet HTTP 204
            local http_code=$(curl -s -o /dev/null -w "%{http_code}" --connect-timeout 5 "$url")
            if [ $? -ne 0 ]; then
                log "DEBUG" "Network error for $url"
                captive_detected=true
                break
            elif [ "$http_code" != "204" ]; then
                log "DEBUG" "Google check failed - HTTP $http_code instead of 204"
                captive_detected=true
                break
            fi
        fi
    done
    
    if [ "$captive_detected" = true ]; then
        log "INFO" "Captive portal detected"
        return 1
    else
        log "INFO" "All connectivity checks passed - no captive portal"
        return 0
    fi
}

start_periodic_checks() {
    local interface="$1"
    local user="$2"
    local check_count=0
    
    log "INFO" "Starting periodic checks for $interface (every ${CHECK_INTERVAL}s)"
    
    while [ $check_count -lt $MAX_CHECKS ]; do
        sleep $CHECK_INTERVAL
        ((check_count++))
        
        log "DEBUG" "Periodic check $check_count/$MAX_CHECKS for $interface"
        
        if ! check_captive_portal; then
            log "INFO" "Captive portal still active - re-opening browser"
            
            export DISPLAY=:0
            export XAUTHORITY=/home/$user/.Xauthority
            
            # Starte Firefox mit Firefox's eigenem Portal Detect
            sudo -u $user env DISPLAY=:0 XAUTHORITY=/home/$user/.Xauthority \
                firefox --new-window "http://detectportal.firefox.com/canonical.html" &
            log "INFO" "Firefox re-started for user $user"
        else
            log "INFO" "Captive portal resolved - stopping periodic checks"
            break
        fi
    done
    
    log "INFO" "Periodic checks completed for $interface"
}

# =============================================================================
# HAUPTPROGRAMM
# =============================================================================

log "INFO" "=== Dispatch triggered: $1 $2 ==="

if [[ "$1" == wl* ]] && [ "$2" = "up" ]; then
    sleep 3
    
    if ! check_captive_portal; then
        log "INFO" "CAPTIVE PORTAL DETECTED! Opening browser..."
        
        # Finde Benutzer
        local_user=$(w -hs | grep ":0" | awk '{print $1}' | head -n1)
        if [ -n "$local_user" ]; then
            log "INFO" "Found user: $local_user"
            
            export DISPLAY=:0
            export XAUTHORITY=/home/$local_user/.Xauthority
            
            # Starte Firefox
            sudo -u $local_user env DISPLAY=:0 XAUTHORITY=/home/$local_user/.Xauthority \
                firefox --new-window "http://detectportal.firefox.com/canonical.html" &
            log "INFO" "Firefox started for user $local_user"
            
            # Starte periodische Checks im Hintergrund
            start_periodic_checks "$1" "$local_user" &
        else
            log "WARNING" "No local user found for GUI access"
        fi
    else
        log "INFO" "No captive portal detected on connection start"
    fi

elif [[ "$1" == wl* ]] && [ "$2" = "down" ]]; then
    log "INFO" "WLAN interface $1 disconnected"

fi

log "INFO" "=== Completed ==="