Reapply "lab6 bash exercises"

This reverts commit 8aea945eed.

dummy/12/dir3/file.txt

@@ -0,0 +1 @@
+hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

dummy/2/file.txt

@@ -0,0 +1 @@
+aa

dummy/2/file2.txt

@@ -0,0 +1 @@
+aaa

dummy/2/files/file.txt

@@ -0,0 +1 @@
+aa

dummy/2/files/file2.txt

@@ -0,0 +1 @@
+aaaa

dummy/7/targets.txt

@@ -0,0 +1,4 @@
+8.8.8.8
+google.com
+yahoo.com
+example.com

include/bconsumer.h

@@ -1,22 +0,0 @@
-//
-// Created by lumijiez on 12/8/24.
-//
-
-#ifndef BCONSUMER_H
-#define BCONSUMER_H
-
-#include "buffer.h"
-#include <semaphore>
-
-class BConsumer {
-public:
-    BConsumer(int id, Buffer& buffer, std::counting_semaphore<5>& sem);
-    void run() const;
-
-private:
-    int id;
-    Buffer& buffer;
-    std::counting_semaphore<5>& consumerSem;
-};
-
-#endif //BCONSUMER_H

include/bproducer.h

@@ -1,22 +0,0 @@
-//
-// Created by lumijiez on 12/8/24.
-//
-
-#ifndef BPRODUCER_H
-#define BPRODUCER_H
-
-#include "buffer.h"
-#include <semaphore>
-
-class BProducer {
-public:
-    BProducer(int id, Buffer& buffer, std::counting_semaphore<3>& sem);
-    void run() const;
-
-private:
-    int id;
-    Buffer& buffer;
-    std::counting_semaphore<3>& producerSem;
-};
-
-#endif //BPRODUCER_H

include/buffer.h

@@ -1,28 +0,0 @@
-//
-// Created by lumijiez on 11/16/24.
-//
-
-#ifndef BUFFER_H
-#define BUFFER_H
-
-#include <queue>
-#include <mutex>
-#include <condition_variable>
-
-class Buffer {
-public:
-    explicit Buffer(int size);
-    void produce(int producerId, int item);
-    int consume(int consumerId);
-    bool isEmpty() const;
-    bool isFull() const;
-
-private:
-    std::queue<int> items;
-    const int maxSize;
-    mutable std::mutex mtx;
-    std::condition_variable notFull;
-    std::condition_variable notEmpty;
-};
-
-#endif //BUFFER_H

include/consumer.h

@@ -1,22 +0,0 @@
-//
-// Created by lumijiez on 11/16/24.
-//
-
-#ifndef CONSUMER_H
-#define CONSUMER_H
-
-#include <semaphore>
-
-class Consumer {
-public:
-    Consumer(int id, int read_fd, std::counting_semaphore<5>& consumerSem);
-    void run(std::atomic<int>& itemsConsumed, const std::atomic<bool>& stopFlag) const;
-
-private:
-    int consumerId;
-    int readFd;
-    std::counting_semaphore<5>& consumerSemaphore;
-};
-
-#endif
-

include/p_producer_consumer.h

@@ -1,20 +0,0 @@
-//
-// Created by lumijiez on 12/8/24.
-//
-
-#ifndef P_PRODUCER_CONSUMER_H
-#define P_PRODUCER_CONSUMER_H
-
-#define PNUM_PRODUCERS 3
-#define PNUM_CONSUMERS 2
-#define PBUFFER_SIZE 10
-
-#define PSEM_MUTEX_NAME "/buffer_mutex"
-#define PSEM_FULL_NAME "/buffer_full"
-#define PSEM_EMPTY_NAME "/buffer_empty"
-
-void pproducer(int producer_id, int write_fd);
-
-void pconsumer(int consumer_id, int read_fd);
-
-#endif //P_PRODUCER_CONSUMER_H

include/producer.h

@@ -1,21 +0,0 @@
-//
-// Created by lumijiez on 11/16/24.
-//
-
-#ifndef PRODUCER_H
-#define PRODUCER_H
-
-#include <semaphore>
-
-class Producer {
-public:
-    Producer(int id, int write_fd, std::counting_semaphore<3>& producerSem);
-    void run(std::atomic<int>& itemsProduced, const std::atomic<bool>& stopFlag) const;
-
-private:
-    int producerId;
-    int writeFd;
-    std::counting_semaphore<3>& producerSemaphore;
-};
-
-#endif

include/reader_writer.h

@@ -1,30 +0,0 @@
-//
-// Created by lumijiez on 12/8/24.
-//
-
-#ifndef READER_WRITER_H
-#define READER_WRITER_H
-
-#include <semaphore.h>
-#include <fstream>
-
-class ReaderWriter {
-public:
-    ReaderWriter(int numReaders, int numWriters, std::string  filename);
-    ~ReaderWriter();
-    void run();
-
-private:
-    int numReaders;
-    int numWriters;
-    std::string filename;
-
-    sem_t resourceAccess{};
-    sem_t readCountAccess{};
-    int readCount;
-    int writeCount;
-
-    static void* reader(void* arg);
-    static void* writer(void* arg);
-};
-#endif //READER_WRITER_H

include/signal_handler.h

@@ -1,18 +0,0 @@
-//
-// Created by lumijiez on 11/16/24.
-//
-
-#ifndef SIGNAL_HANDLER_H
-#define SIGNAL_HANDLER_H
-#include <cmath>
-#include <iostream>
-#include <csignal>
-#include <cstdlib>
-#include <stdexcept>
-#include <limits>
-#include <cstdint>
-#include <bits/random.h>
-#include <random>
-void setupSignalHandlers();
-
-#endif //SIGNAL_HANDLER_H

utility.sh

@@ -0,0 +1,338 @@
+#!/bin/bash
+
+file_permissions_and_security() {
+    local file=$1
+    local directory=$2
+
+    local file_permissions=$(stat -c "%a" "$file")
+    if [ "$file_permissions" -gt 644 ]; then
+        echo "The file '$file' has insecure permissions."
+        chmod 644 "$file"
+        echo "Permissions corrected to rw-r--r--."
+    fi
+
+    echo "Scanning directory '$directory' for .sh files..."
+    find "$directory" -type f -name "*.sh" | while read -r script; do
+        if [ ! -x "$script" ]; then
+            echo "The script '$script' is not executable."
+        else
+            echo "The script '$script' is executable."
+        fi
+    done
+}
+
+
+file_integrity_checker() {
+    local file=$1
+    local directory=$2
+
+    if [ ! -f "$file" ]; then
+        echo "Error: File '$file' does not exist."
+        return
+    fi
+
+    if [ ! -d "$directory" ]; then
+        echo "Error: Directory '$directory' does not exist."
+        return
+    fi
+
+    local hash=$(md5sum "$file" | awk '{print $1}')
+
+    local filename=$(basename "$file")
+
+    local file_found=false
+
+    while IFS= read -r other_file; do
+        local other_hash=$(md5sum "$other_file" | awk '{print $1}')
+
+        if [ "$hash" == "$other_hash" ]; then
+            echo "File integrity verified for '$other_file'."
+            file_found=true
+        else
+            echo "File integrity compromised for '$other_file'."
+        fi
+    done < <(find "$directory" -type f -name "$filename")
+
+    if [ "$file_found" == false ]; then
+        echo "File '$filename' not found or not verified in the directory '$directory'."
+    fi
+}
+
+disk_space_monitor() {
+    current_date=$(date)
+    echo "$current_date: Checking disk usage..." >> disk_usage.log
+    df -h | awk -v date="$current_date" 'NR>1 && $1 != "tmpfs" {if ($5+0 > 80) print date ": Warning: Partition " $1 " mounted on " $6 " is above 80% usage."; else print date ": OK! Partition " $1 " mounted on " $6 " is fine."}' | tee -a disk_usage.log
+}
+
+system_process_tracker() {
+    echo "$(date): Total used memory:" >> process_log.txt
+    free -h | grep Mem | awk '{print "Used: " $3 ", Free: " $4 ", Total: " $2}' >> process_log.txt
+
+    echo "$(date): Listing top memory-consuming processes..." >> process_log.txt
+    ps aux --no-headers --sort=-%mem | head -n 5 | while read -r line; do
+        pid=$(echo $line | awk '{print $2}')
+        mem=$(echo $line | awk '{print $4}')
+        cmd=$(echo $line | awk '{print $11}')
+
+        echo "$(date): PID $pid, Mem: $mem%, Command: $cmd" >> process_log.txt
+    done
+
+    echo "$(date): Top 5 memory-consuming processes logged." >> process_log.txt
+}
+
+service_status_checker() {
+    if [ "$#" -eq 0 ]; then
+        services=("nginx" "ssh" "cron")
+    else
+        services=("$@")
+    fi
+
+    echo "$(date): Checking service statuses..." >> service_status.log
+
+    for service in "${services[@]}"; do
+        status=$(systemctl is-active --quiet "$service" && echo "running" || echo "not running")
+        echo "$(date): Service '$service' is $status." >> service_status.log
+
+        if [ "$status" = "not running" ]; then
+            echo "$(date): Service '$service' is not running. Restarting..." | tee -a service_status.log
+            systemctl restart "$service"
+        fi
+    done
+
+    echo "$(date): Service status check complete." >> service_status.log
+}
+
+backup_automation() {
+    local dir=$1
+    local backup_dir="./backup"
+
+    if [ ! -d "$dir" ]; then
+        echo "Error: The provided directory '$dir' does not exist."
+        return 1
+    fi
+
+    if [ ! -d "$backup_dir" ]; then
+        mkdir -p "$backup_dir"
+    fi
+
+    local timestamp=$(date +"%Y%m%d%H%M%S")
+    local backup_file="$backup_dir/$(basename "$dir")_$timestamp.tar.gz"
+
+    tar -czf "$backup_file" "$dir" && echo "Backup created successfully at $backup_file."
+
+    if [ $? -ne 0 ]; then
+        echo "Error: Backup failed."
+        return 2
+    fi
+}
+
+network_connectivity_checker() {
+    local targets_file=$1
+    local default_targets=("8.8.8.8" "google.com" "yahoo.com")
+
+    if [ -z "$targets_file" ]; then
+        targets_file="/tmp/targets.txt"
+        printf "%s\n" "${default_targets[@]}" > "$targets_file"
+    fi
+
+    echo "$(date): Checking network connectivity..." >> connectivity_log.txt
+
+    while IFS= read -r target; do
+        if ping -c 1 "$target" &>/dev/null; then
+            echo "$(date): $target is reachable." | tee -a connectivity_log.txt
+        else
+            echo "$(date): Warning: $target is unreachable." | tee -a connectivity_log.txt
+        fi
+    done < "$targets_file"
+}
+
+log_cleaner() {
+    local log_dir=$1
+    local cleanup_log="cleanup.log"
+
+    if [ ! -d "$log_dir" ]; then
+        echo "Error: Directory '$log_dir' does not exist."
+        return 1
+    fi
+
+    touch "$cleanup_log"
+
+    find "$log_dir" -type f -name "*.log" -mtime +7 | while read -r log_file; do
+        echo "Found old log: $log_file"
+        read -p "Delete $log_file? (y/n): " choice
+        if [[ "$choice" =~ ^[Yy]$ ]]; then
+            rm "$log_file"
+            echo "Deleted: $log_file" >> "$cleanup_log"
+        fi
+    done
+}
+
+cron_job_monitor() {
+    local user=$1
+    local log_file="/var/log/syslog"
+    local failure_log="cron_failures.log"
+    local current_date=$(date +"%b %d")
+
+    echo "$(date): Checking cron jobs for user '$user'..." >> "$failure_log"
+
+    crontab -l -u "$user" | while read -r job; do
+        grep "$current_date" "$log_file" | grep "CRON" | grep -q "$job"
+
+        if [ $? -ne 0 ]; then
+            echo "$(date): Cron job failed: $job" >> "$failure_log"
+        fi
+    done
+}
+
+ram_usage_analyzer() {
+    echo "$(date): Monitoring RAM usage..." >> ram_usage.log
+    for i in {1..100}; do
+        read total used free <<< $(free -m | awk '/Mem:/ {print $2, $3, $4}')
+
+        used_percentage=$((used * 100 / total))
+
+        echo "$(date): Total: ${total}MB, Used: ${used}MB, Free: ${free}MB, Used Percentage: ${used_percentage}%" >> ram_usage.log
+
+        progress_bar="["
+        for ((j = 0; j < used_percentage; j+=2)); do
+            progress_bar="${progress_bar}#"
+        done
+        for ((j = used_percentage; j < 100; j+=2)); do
+            progress_bar="${progress_bar} "
+        done
+        progress_bar="${progress_bar}] $used_percentage%"
+        echo -e "$progress_bar"
+
+        if [ "$used_percentage" -gt 50 ]; then
+            echo "$(date): Warning: Memory usage exceeds 50%" | tee -a ram_usage.log
+        fi
+
+        sleep 1
+    done
+}
+
+open_ports_scanner() {
+    expected_ports=(22 80 443)
+
+    declare -A processed_ports
+
+    ss -tuln | awk 'NR>1 {print $5}' | while read -r port_info; do
+        port="${port_info##*:}"
+
+        if [[ -n "${processed_ports[$port]}" ]]; then
+            continue
+        fi
+
+        processed_ports[$port]=1
+
+        if [[ " ${expected_ports[@]} " =~ " ${port} " ]]; then
+            service_name=$(ss -tuln | grep ":$port" | awk '{print $1, $5}')
+            echo "Port $port is open and expected. Service: $service_name" >> open_ports.log
+        else
+            echo "Warning: Port $port is open and unexpected." >> open_ports.log
+            echo "Warning: Port $port is open and unexpected."
+        fi
+    done
+}
+
+directory_size_auditor() {
+    local dir=$1
+
+    if [[ -z "$dir" || ! -d "$dir" ]]; then
+        echo "Error: Please provide a valid directory path."
+        return 1
+    fi
+
+    echo "$(date): Analyzing directory sizes in '$dir'..." >> dir_size_audit.log
+
+    du -sh "$dir"/* 2>/dev/null | sort -rh | head -n 5 | while read -r size path; do
+        echo "$(basename "$path"): $size" >> dir_size_audit.log
+    done
+
+    echo "Top 5 largest directories logged."
+}
+
+exercises=(
+    "File Permissions and Security Script"
+    "File Integrity Checker"
+    "Disk Space Monitor"
+    "System Process Tracker"
+    "Service Status Checker"
+    "Backup Automation Script"
+    "Network Connectivity Checker"
+    "Log Cleaner Script"
+    "Cron Job Status Monitor"
+    "RAM Usage Analyzer"
+    "Open Ports Scanner"
+    "Directory Size Auditor"
+)
+
+echo "Choose an exercise to run:"
+for i in {1..12}; do
+    echo "$i) ${exercises[$i-1]}"
+done
+
+echo "Enter the number of the exercise:"
+read exercise
+
+case $exercise in
+    1)
+        echo "Enter the file path:"
+        read file
+        echo "Enter the directory path:"
+        read directory
+        file_permissions_and_security "$file" "$directory"
+        ;;
+    2)
+        echo "Enter the file path:"
+        read file
+        echo "Enter the directory path:"
+        read directory
+        file_integrity_checker "$file" "$directory"
+        ;;
+    3)
+        disk_space_monitor
+        ;;
+    4)
+        system_process_tracker
+        ;;
+    5)
+        echo "Enter service names separated by spaces:"
+        read -a services
+        service_status_checker "${services[@]}"
+        ;;
+    6)
+        echo "Enter the directory path to backup:"
+        read dir
+        backup_automation "$dir"
+        ;;
+    7)
+        echo "Enter the path to the targets file:"
+        read targets_file
+        network_connectivity_checker "$targets_file"
+        ;;
+    8)
+        echo "Enter the log directory path:"
+        read log_dir
+        log_cleaner "$log_dir"
+        ;;
+    9)
+        echo "Enter the user name:"
+        read user
+        cron_job_monitor "$user"
+        ;;
+    10)
+        ram_usage_analyzer
+        ;;
+    11)
+        open_ports_scanner
+        ;;
+    12)
+        echo "Enter the directory path:"
+        read dir
+        directory_size_auditor "$dir"
+        ;;
+    *)
+        echo "Invalid choice. Exiting."
+        ;;
+esac