renamed the branch to myname_initiallastname

Pradyumn_V/otw.md

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+## Level 0
+
+### pswd - bandit0
+
+used ssh to login to the server for overthewire where bandit is played
+
+## Level 1
+
+### pswd - ZjLjTmM6FvvyRnrb2rfNWOZOTa6ip5If
+
+used ls to find readme file and used **cat** to read the contents
+
+## Level 2
+
+### pswd - 263JGJPfgU6LtdEvgfWU1XP5yac29mFx
+
+used ls to find a file named '-' used ./- to specify the entire directory because passing only cat - can cause problems since - is commonly used to pass arguements to the function
+
+## Level 3
+
+### pswd - MNk8KNH3Usiio41PRUEoDFPqfxLPlSmx
+
+used quotations to specify the filename when passed as an arguement in cat
+
+## Level 4
+
+### pswd - 2WmrDFRmJIq3IPxneAaMGhap0pFhF3NJ
+
+used **ls -a** to show all files including hidden ones then read the file using **cat ./...Hidden-From-You**
+
+## Level 5
+
+### pswd - 4oQYVPkxZOOEOO5pTW81FB8j8lxXGUQw
+
+used file ./* to find the type of text in all files and read the file07 using cat since it contained ASCII characters
+
+## Level 6
+
+### pswd - HWasnPhtq9AVKe0dmk45nxy20cvUa6EG
+
+executed **file */* | grep "ASCII text" | du -b -a | grep 1033** to extract all ascii text files of size 1033 since only 1 result showed, read that using cat and got the password
+
+## Level 7
+
+### pswd - morbNTDkSW6jIlUc0ymOdMaLnOlFVAaj
+
+used **find / -user bandit7 -group bandit6 -size 33c 2>/dev/null** we add the last part to hide all permission denied error messages
+
+## Level 8
+
+### pswd - dfwvzFQi4mU0wfNbFOe9RoWskMLg7eEc
+
+**cat data.txt | grep millionth** returned the complete line containing millionth including the password
+
+## Level 9
+
+### pswd - 4CKMh1JI91bUIZZPXDqGanal4xvAg0JM
+
+**sort data.txt | uniq -u** sort will sort the file allowing uniq to filter out repeating lines using the -u tag and return the only line appearing once
+
+## Level 10
+
+### pswd - FGUW5ilLVJrxX9kMYMmlN4MgbpfMiqey
+
+**cat data.txt | strings | grep ==** strings will return all human readable lines and grep filters them
+
+## Level 11
+
+### pswd - dtR173fZKb0RRsDFSGsg2RWnpNVj3qRr
+
+**cat data.txt | base64 -d** decrypts the encoded text and returns password
+
+## Level 12
+
+### pswd - 7x16WNeHIi5YkIhWsfFIqoognUTyj9Q4
+
+**cat data.txt | tr 'A-Za-z' 'N-ZA-Mn-za-m'** translate command is used to execute rotation by 13 on the character skipping numerical values
+
+## Level 13
+
+### pswd - FO5dwFsc0cbaIiH0h8J2eUks2vdTDwAn
+
+we know that first we extract the hexadecimal contents then on reading it using **xxd** we see gzip compressed files start with 1f 8b as their first few bytes hence we decrypt then we see 425a which is bzip2 we repeat this process and encounter .bin files indicating archive extracted using **tar -xf**
+
+## Level 14
+
+### pswd - MU4VWeTyJk8ROof1qqmcBPaLh7lDCPvS
+
+first we find the location of the ssh key file using ls then we download it by logging out and accessing the server from our computer using scp (secure copy protocol) for transferring files between hosts over a network then we reduce permissions using chmod 700 and finally login using the sshkey.private with -i tag with ssh
+
+## Level 15
+
+### pswd - 8xCjnmgoKbGLhHFAZlGE5Tmu4M2tKJQo
+
+submitted level 14 password using **nc localhost 30000** and entering the password when prompted

Task2/pradyumn_v/Content.cpp

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+#include "Content.h"
+
+Content::Content(string name, string type, int rated){
+    title = name;
+    genre = type;
+    rating = (rated<=5)?rated:0;
+}

Task2/pradyumn_v/Content.h

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+#pragma once
+#include<iostream>
+using namespace std;
+
+class Content{
+    public:
+        string title;
+        string genre;
+        int rating;
+        bool is_rented=false;
+        bool is_purchased=false;
+        Content(string name, string type, int rated);
+};

Task2/pradyumn_v/Dockerfile

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+FROM gcc:latest
+WORKDIR /usr/src/app
+COPY . .
+RUN g++ *.cpp -o media_rental_system
+VOLUME ["/app/user", "/app/admin", "/app/catalogues"]
+CMD ["./media_rental_system"]

Task2/pradyumn_v/admin.cpp

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+#include "admin.h"
+
+void Admin::save(const string& filename) {
+    ofstream out(filename);
+    if (!out) {
+        cerr << "Could not open file for writing.\n";
+        return;
+    }
+    out << username << '\n' << password << '\n';
+
+    out.close();
+}
+
+void Admin::load(const string& filename) {
+    ifstream in(filename);
+    if (!in) {
+        cerr << "Could not open file for reading.\n";
+        return;
+    }
+    getline(in, username);
+    getline(in, password);
+    in.close();
+}
+
+
+void Admin::save_catalogues(const string& filename, movie_entry* movie_cat, tv_show_entry* show_cat){
+    ofstream out(filename);
+    if (!out) {
+        cerr << "Error opening file for writing: " << filename << endl;
+        return;
+    }
+
+    movie_entry* m = movie_cat;
+    while (m) {
+        Movie* movie = m->data;
+        out << "MOVIE " << movie->title << " " 
+            << movie->genre << " " << movie->rating << " "
+            << movie->duration << " " << movie->rent_cost << " "
+            << movie->purchase_cost << "\n";
+        m = m->next;
+    }
+
+    tv_show_entry* s = show_cat;
+    while (s) {
+        Show* show = s->data;
+        out << "SHOW " << show->title << " " 
+            << show->genre << " " << show->rating << " "
+            << show->seasons << " " << show->ep_per_season << " "
+            << show->rent_cost << " " << show->purchase_cost << "\n";
+        s = s->next;
+    }
+
+    out.close();
+}
+
+
+
+
+movie_entry* Admin::add_movie(string title, string type, int rated, int time, int rent, int purchase, movie_entry* head){
+    movie_entry* entry = new movie_entry;
+    entry->data = new Movie(title, type, rated, time, rent, purchase);
+    entry->next=nullptr;
+    bool added = false;
+
+    if(!head){
+        return entry;
+    }
+
+    movie_entry* curr = head;
+    while(curr->next){
+        if(curr->data->genre==entry->data->genre){
+            entry->next=curr->next;
+            curr->next = entry;
+            added = true;
+            break;
+        }
+        curr = curr->next;
+    }
+    if(!added){
+        curr->next = entry;
+    }
+    return head;
+}
+
+movie_entry* Admin::remove_movie(string name, movie_entry* head){
+    movie_entry* curr = head;
+    movie_entry* prev = nullptr;
+    if(curr->data->title==name){
+        head = curr->next;
+        return head;
+    }
+    while(curr->data->title!=name){
+        prev = curr;
+        curr = curr->next;
+        if(curr==nullptr){
+            return head;
+        }
+    }
+    prev->next = curr->next;
+    return head;
+}
+
+tv_show_entry* Admin::add_show(string title, string type, int rated, int season, int ep_per_seasons, int time, int rent, int purchase, tv_show_entry* head){
+    tv_show_entry* entry = new tv_show_entry;
+    entry->data = new Show(title, type, rated, season, ep_per_seasons, rent, purchase);
+    entry->next=nullptr;
+    bool added = false;
+
+    if(!head){
+        return entry;
+    }
+
+    tv_show_entry* curr = head;
+    while(curr->next){
+        if(curr->data->genre==entry->data->genre){
+            entry->next=curr->next;
+            curr->next = entry;
+            added = true;
+            break;
+        }
+        curr = curr->next;
+    }
+    if(!added){
+        curr->next = entry;
+    }
+    return head;
+}
+
+tv_show_entry* Admin::remove_show(string name, tv_show_entry* head){
+    tv_show_entry* curr = head;
+    tv_show_entry* prev = nullptr;
+    if(curr->data->title==name){
+        head = curr->next;
+        return head;
+    }
+    while(curr->data->title!=name){
+        prev = curr;
+        curr = curr->next;
+        if(curr==nullptr){
+            return head;
+        }
+    }
+    prev->next = curr->next;
+    return head;
+}

Task2/pradyumn_v/admin.h

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+#pragma once
+#include<iostream>
+#include "show_entry.h"
+#include "movie_entry.h"
+#include<fstream>
+using namespace std;
+
+class Admin{
+    public:
+        string username;
+        string password;
+        void save(const string& filename);
+        void load(const string& filename);
+        void save_catalogues(const string& filename, movie_entry* movie_cat, tv_show_entry* show_cat);
+        movie_entry* add_movie(string title, string type, int rated, int time, int rent, int purchase, movie_entry* head);
+        movie_entry* remove_movie(string name, movie_entry* head);
+        tv_show_entry* add_show(string title, string type, int rated, int season, int ep_per_seasons, int time, int rent, int purchase, tv_show_entry* head);
+        tv_show_entry* remove_show(string name, tv_show_entry* head);
+};

Task2/pradyumn_v/admin/admin1.dat

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+admin1
+34567

Task2/pradyumn_v/catalogues/data.dat

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+MOVIE MeBeforeYou Romantic 3 100 120 140
+SHOW TBBT SitCom 4 8 24 300 350
+SHOW HIMYM SitCom 2 11 13 400 3000