level09: source code done

level09/source.c

@@ -0,0 +1,59 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char *set_msg(char *msg, int len);
+int set_username(char *username);
+
+int secret_backdoor(void)
+{
+	char s[128];
+
+	fgets(s, 128, stdin);
+	return system(s);
+}
+
+int handle_msg(void)
+{
+	char msg[140];
+	char username[40];
+	int len = 140;
+
+	set_username(username);
+	set_msg(msg, len);
+	return puts(">: Msg sent!");
+}
+
+char *set_msg(char *msg, int len)
+{
+	char s[1024];
+
+	memset(s, 0, sizeof(s));
+	puts(">: Msg @Unix-Dude");
+	printf(">>: ");
+	fgets(s, 1024, stdin);
+	return strncpy((char *)msg, s, len);
+}
+
+int set_username(char *username)
+{
+	char s[140];
+
+	memset(s, 0, 128);
+	puts(">: Enter your username");
+	printf(">>: ");
+	fgets(s, 128, stdin);
+	for (int i = 0; i <= 40 && s[i]; ++i)
+		username[i] = s[i];
+	return printf(">: Welcome, %s", username);
+}
+
+int main(void)
+{
+	puts("--------------------------------------------\n"
+	     "|   ~Welcome to l33t-m$n ~    v1337        |\n"
+	     "--------------------------------------------");
+	handle_msg();
+	return 0;
+}