A handy Bash script to monitor your internet connection, log downtimes, and notify you of changes in connectivity status.

Internet-Connectivity-Checker.sh

#!/bin/bash

# Default Configurations
DEFAULT_PING_HOSTS=("8.8.8.8" "1.1.1.1")
DEFAULT_CHECK_INTERVAL=10
DEFAULT_LOG_FILE="$(dirname "$0")/internet_downtime.log"

# Initialize Configurations
PING_HOSTS=("${DEFAULT_PING_HOSTS[@]}")
CHECK_INTERVAL=$DEFAULT_CHECK_INTERVAL
LOG_FILE=$DEFAULT_LOG_FILE

# Parse Command Line Arguments
while getopts "h:i:l:" opt; do
  case $opt in
    h) IFS=',' read -r -a PING_HOSTS <<< "$OPTARG";;
    i) CHECK_INTERVAL="$OPTARG";;
    l) LOG_FILE="$OPTARG";;
    *) echo "Usage: $0 [-h hosts] [-i interval] [-l logfile]"; exit 1;;
  esac
done

# Function Definitions
check_internet() {
    for host in "${PING_HOSTS[@]}"; do
        if /sbin/ping -c 1 "$host" &>/dev/null; then
            return 0
        fi
    done
    return 1
}

log_message() {
    echo "$(date) - $1" | tee -a "$LOG_FILE"
}

send_notification() {
    local message=$1
    if [ "$(uname)" == "Darwin" ]; then
        /usr/bin/osascript -e "Display notification \"$message\" with title \"Connectivity Alert\""
    elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then
        notify-send "Connectivity Alert" "$message"
    fi
}

handle_exit() {
    log_message "Internet connectivity checker stopped."
    exit 0
}

# Trap SIGINT for graceful termination
trap handle_exit SIGINT

# Main Loop
log_message "Internet connectivity checker started."
notification_sent=0
down_times=0
longest_duration=0
downtime_start=0

while true; do
    if check_internet; then
        if [ "$notification_sent" -eq 1 ]; then
            send_notification "Internet is reconnected"
            notification_sent=0
            downtime_end=$(date +%s)
            duration=$((downtime_end - downtime_start))
            down_times=$((down_times + 1))
            longest_duration=$(($duration > $longest_duration ? $duration : $longest_duration))
        fi
        echo -ne "\rDowntimes: $down_times | Longest Duration: ${longest_duration}s | Status: \033[32mONLINE\033[0m"
    else
        if [ "$notification_sent" -eq 0 ]; then
            send_notification "Internet is disconnected"
            notification_sent=1
            downtime_start=$(date +%s)
            log_message "Internet down"
        fi
        echo -ne "\rDowntimes: $down_times | Longest Duration: ${longest_duration}s | Status: \033[31mOFFLINE\033[0m"
    fi
    sleep "$CHECK_INTERVAL"
done

Internet Connectivity Checker

Overview

The Internet Connectivity Checker is a Bash script designed to monitor internet connectivity. It logs downtimes, notifies the user when the internet status changes, and is equipped with customization options for different use cases. This tool is ideal for network troubleshooting and continuous monitoring of your internet connection.

Features

• Connectivity Monitoring: Regularly pings configured hosts to check internet connectivity.
• Downtime Logging: Records each downtime incident with timestamps.
• Notifications: Sends desktop notifications when the internet status changes.
• Customizable: Allows setting custom hosts and check intervals via command-line arguments.
• Cross-Platform Notifications: Supports macOS and Linux desktop notifications.
• Color-coded Status: Displays a real-time, color-coded connectivity status in the terminal.

Usage

To use the script, you can either run it with its default settings or provide optional command-line arguments for customization.

Running with Default Settings

Simply execute the script:

./internet_connectivity_checker.sh

Custom Usage

To run the script with custom settings:

./internet_connectivity_checker.sh -h "8.8.8.8,1.1.1.1" -i 5 -l /path/to/your/logfile.log

• -h: Comma-separated list of hosts to ping (default: "8.8.8.8,1.1.1.1").
• -i: Interval in seconds between checks (default: 10).
• -l: Path to the log file (default: same directory as the script).

Requirements

This script requires Bash and utilizes common utilities (ping, date, etc.) available in most Unix-like environments. For notifications:

• macOS: Requires osascript.
• Linux: Requires notify-send.

License

This project is open source and available under the MIT License.

Contributions

Contributions, issues, and feature requests are welcome!.

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Happy monitoring! Stay connected. 🌐