first commit

blackmarket.c

@@ -0,0 +1,260 @@
+//gcc -m32 -fno-stack-protector -z execstack -no-pie blackmarket.c -o blackmarket
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <time.h>
+#include "blackmarket.h"
+
+#define BUFSIZE 0x1ff
+
+int diamond;
+
+void not_used(){
+  system("/bin/sh");
+}
+
+Node *Node_create(){
+  Node *node = malloc(sizeof(Node));
+
+  assert(node != NULL);
+  
+  node->data = "";
+  node->next = NULL;
+}
+
+List *List_create(){
+  List *list = malloc(sizeof(List));
+  assert(list != NULL);
+
+  Node *node = Node_create();
+  list->first = node;
+  return list;
+}
+
+void List_append(List *list, char *str){
+  assert(list != NULL);
+  assert(str != NULL);
+
+  Node *node = list->first;
+  while(node->next != NULL){
+    node = node->next;
+  }
+  node->data = str;
+  node->next = Node_create();
+}
+
+int List_find(List *list, char *str){
+  assert(list != NULL);
+  assert(str != NULL);
+
+  int index = 0;
+  Node *node = list->first;
+  while(node->next != NULL){
+    int cmp = strcmp(str, node->data);
+    if(cmp == 0){
+      return index;
+    }
+    node = node->next;
+    index++;
+  }
+  return -1;
+}
+
+int List_length(List *list){
+  assert(list != NULL);
+
+  Node *node = list->first;
+  int length = 0;
+  while(node->next != NULL){
+    length++;
+    node = node->next;
+  }
+  return length;
+}
+
+void Node_destroy(Node *node){
+  assert(node != NULL);
+  free(node);
+}
+
+void List_remove(List *list, int index){
+  assert(list != NULL);
+  if(index < 0){
+    exit(0);
+  }else{
+    assert(index < List_length(list));
+  
+    if(index == 0){
+      Node *node = list->first;
+      list->first = list->first->next;
+      Node_destroy(node);
+    }else{
+      Node *before = list->first;
+      for(int i=1; i<index; ++i){
+        before = before->next;
+        index--;
+      }
+      Node *node = before->next;
+      before->next = before->next->next;
+      Node_destroy(node);
+    }
+  }
+}
+
+void List_print(List *list){
+  if(list != NULL){
+    printf("[");
+    Node *node = list->first;
+    if(node->next == NULL){
+      printf("NULL");
+    }
+    while(node->next != NULL){
+      printf("%s", node->data);
+      node = node->next;
+      if (node->next != NULL){
+        printf(", ");
+      }
+    }
+    printf("]\n");
+  }
+}
+
+int sell_item(char *item){
+  int current_wallet = 0;
+
+  if(strcmp(item, "potatoes") == 0){
+    printf("You've earn 50 wallet!\n");
+    current_wallet = 50;
+    return current_wallet;
+  }else if(strcmp(item, "grape") == 0){
+    printf("You've earn 100 wallet!\n");
+    current_wallet = 100;
+    return current_wallet;
+  }else if(strcmp(item, "apel") == 0){
+    printf("You've earn 60 wallet!\n");
+    current_wallet = 60;
+    return current_wallet;
+  }
+}
+
+void message(){
+  printf("You don't have enough wallet!\n");
+}
+
+void success_msg(char *item){
+  printf("%s added to the list!\n", item);
+}
+
+void menu(){
+
+  printf("+-----------------------+\n");
+  printf("MASSIVE BLACKMARKET STORE\n");
+  printf("+-----------------------+\n");
+  printf("1. buy flag (200 Diamond)\n");
+  printf("2. buy potatoes (50 Wallet)\n");
+  printf("3. buy grape (100 Wallet)\n");
+  printf("4. buy apel (60 Wallet)\n");
+  printf("5. show items\n");
+  printf("6. sell items\n");
+  printf("7. check wallet\n");
+  printf("8. check diamond\n");
+  printf("9. get free diamond!\n");
+  printf("10. exit\n");
+}
+
+int main(){
+   
+  List *l = List_create();
+  char buffer[BUFSIZE+1], ans[2];
+  int wallet = 300, temp, try = 0;
+  
+  LOOP:while(1){
+    menu();
+    printf(">>");
+    fflush(stdout);
+    scanf("%s", &ans);
+    if(strcmp(ans, "1") == 0){ 
+      if(diamond < 200){
+        printf("Not enough diamond to buy flag!\nnothing to add.\n");
+        goto LOOP;
+      }else if(diamond >= 200){
+        diamond = diamond - 200;
+        List_append(l, "flag");
+        success_msg("flag");
+        goto LOOP;
+      }
+    }else if(strcmp(ans, "2") == 0){
+      if(wallet < 50){
+        message();
+        goto LOOP;
+      }
+      success_msg("potatoes");
+      wallet = wallet - 50;
+      List_append(l, "potatoes");
+      goto LOOP;
+    }else if(strcmp(ans, "3") == 0){
+      if(wallet < 100){
+        message();
+        goto LOOP;
+      }
+      success_msg("grape");
+      wallet = wallet - 100;
+      List_append(l, "grape");
+      goto LOOP;
+    }else if(strcmp(ans, "4") == 0){
+      if(wallet < 60){
+        message();
+        goto LOOP;
+      }
+      success_msg("apel");
+      wallet = wallet - 60;
+      List_append(l, "apel");
+      goto LOOP;
+    }else if(strcmp(ans, "5") == 0){
+      printf("\nYour Items :\n");
+      List_print(l);
+      goto LOOP;
+    }else if(strcmp(ans, "6") == 0){
+      getchar();
+      printf("What items you want to sell ?\n");
+      fflush(stdout);
+      fgets(buffer, sizeof(buffer), stdin); 
+      printf("You sell : ");
+      printf(buffer);
+      strtok(buffer, "\n"); 
+      int check = List_find(l, buffer);
+      if(check == (-1)){
+        printf("Not Found!\n");
+        exit(1);
+      }else{
+        List_remove(l, List_find(l, buffer));
+        wallet = wallet + sell_item(buffer);
+      }
+    }else if(strcmp(ans, "7") == 0){
+      printf("\nYour Wallet : %d\n", wallet);
+      goto LOOP;
+    }else if(strcmp(ans, "8") == 0){
+      printf("\nYour diamond : %d\n", diamond);
+      goto LOOP;
+    }else if(strcmp(ans, "9") == 0){
+      try += 1;
+      srand(time(NULL));
+      int r = rand() % 10;
+      if(try <= 4){
+        printf("You get %d diamond\n", r);
+        diamond = diamond + r;
+        goto LOOP;
+      }
+      printf("No diamond for you!\n");
+      goto LOOP;
+    }else if(strcmp(ans, "10") == 0){
+      printf("Thankyou for visiting!");
+      exit(0);
+    }else{
+      fprintf(stderr, "Bad Request!\n");
+      exit(0);
+    }
+  }
+}

test.sh

@@ -0,0 +1,2 @@
+#!/bin/bash
+socat TCP-LISTEN:2324,reuseaddr,fork EXEC:"./blackmarket"