From 37f00f4322477a4b2757a3c4f9b84fe3dafe3214 Mon Sep 17 00:00:00 2001
From: jc <jc@git.server>
Date: Wed, 12 Mar 2025 21:26:27 +0300
Subject: [PATCH] source code

---
 random_challs/jmp_to_win/source.c | 56 +++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 random_challs/jmp_to_win/source.c

diff --git a/random_challs/jmp_to_win/source.c b/random_challs/jmp_to_win/source.c
new file mode 100644
index 0000000..51b81dd
--- /dev/null
+++ b/random_challs/jmp_to_win/source.c
@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <unistd.h>
+
+void segfault_handler() {
+  printf("Segfault Occurred, incorrect address.\n");
+  exit(0);
+}
+
+void call_functions() {
+  char buffer[64];
+  printf("Enter your name:");
+  fgets(buffer, 64, stdin);
+  printf(buffer);
+
+  unsigned long val;
+  printf(" enter the address to jump to, ex => 0x12345: ");
+  scanf("%lx", &val);
+
+  void (*foo)(void) = (void (*)())val;
+  foo();
+}
+
+int win() {
+  FILE *fptr;
+  char c;
+
+  printf("You won!\n");
+  // Open file
+  fptr = fopen("flag.txt", "r");
+  if (fptr == NULL)
+  {
+      printf("Cannot open file.\n");
+      exit(0);
+  }
+
+  // Read contents from file
+  c = fgetc(fptr);
+  while (c != EOF)
+  {
+      printf ("%c", c);
+      c = fgetc(fptr);
+  }
+
+  printf("\n");
+  fclose(fptr);
+}
+
+int main() {
+  signal(SIGSEGV, segfault_handler);
+  setvbuf(stdout, NULL, _IONBF, 0); // _IONBF = Unbuffered
+
+  call_functions();
+  return 0;
+}
\ No newline at end of file