NDH 2k10 public wargame, level1

/***********************************
|            level1.c              |
|  http://wargame.nuitduhack.com/  |
|  http://www.nuitduhack.com/      |
***********************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void dummy()
{
        setresuid(geteuid(),geteuid(),geteuid());
        system("sleep 1; cat /home/level2/passwd;");
    exit(0);
}

int *p;
void func(char *arg)
{
        char buf[16];
        p = (int *)&buf[sizeof(buf)];

    printf("dummy() is at: 0x%08x\n", dummy);
        printf("before:   SEBP=%p\n\t  SEIP=0x%08x\n", *p, *(p+1));
        strcpy(buf, arg);
        printf("after:    SEBP=%p\n\t  SEIP=0x%08x\n", *p, *(p+1));

}
int main(int argc, char *argv[])
{
        if(!argv[1]) {
        printf("No command found...\n");
        return;
    }
        func(argv[1]);
}