#include <iostream>
#include <fstream>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <pwd.h>

int main(int ac, char** av)
{
        std::ofstream   log;
        log.open("/tmp/chrooting-php.log", std::ios_base::app);
        std::clog.rdbuf(log.rdbuf());

        if (getuid() == 0) {
                std::clog << "[" << getpid() << "] User uid should not be 0." << std::endl;
                return 1;
        }
        if (geteuid() != 0) {
                std::clog << "[" << getpid() << "] User euid must be 0 (are you sure binary is setuid(0) ?)." << std::endl;
                return 2;
        }

        struct passwd *passwd = getpwuid (getuid());
        if (passwd == NULL) {
                std::clog << "[" << getpid() << "] Unable to find struct passwd for uid:" << getuid() << "." << std::endl;
                return 3;
        }
        //std::clog << "[" << getpid() << "] Chrooting to " << passwd->pw_dir << std::endl;
        if (chroot(passwd->pw_dir) == -1) {
                std::clog << "[" << getpid() << "] failure to chroot to " << passwd->pw_dir << std::endl;
                return 4;
        }
        std::clog << "[" << getpid() << "] Running as " << getuid() << " in " << passwd->pw_dir << "." << std::endl;
        execv("/bin/php-cgi", av);
        return 0;
}