C++ (Cpp) Echroot Examples

Example #1

File: secure-umount.c Project: AlexanderS/util-vserver

int main(int argc, char *argv[])
{
  char const *	dir;
  int		root_fd;
  int		this_fd;
  char *	umount_cmd[] = { UMOUNT_PROG, "-l", "-n", ".", 0 };

  if (argc<2) {
    WRITE_MSG(2, "Try '");
    WRITE_STR(2, argv[0]);
    WRITE_MSG(2, " --help' for more information.\n");
    return EXIT_FAILURE;
  }

  if (strcmp(argv[1], "--help")==0)    showHelp(1, argv[0], 0);
  if (strcmp(argv[1], "--version")==0) showVersion();

  dir = argv[1];
  if (strcmp(dir, "--")==0 && argc>=3) dir = argv[2];

  root_fd = Eopen("/", O_RDONLY, 0);
  Echroot(".");
  Echdir(dir);
  this_fd = Eopen(".", O_RDONLY, 0);
  Efchdir(root_fd);
  Echroot(".");
  Efchdir(this_fd);

  Eclose(root_fd);
  Eclose(this_fd);

  Eexecv(umount_cmd[0], umount_cmd);
}

Example #2

File: cfg.c Project: zipangotes/DSL-G624T_GPL_code

inline static pid_t
initializeDaemon(/*@in@*/struct ConfigInfo const *cfg)
{
  assert(cfg!=0);
  
  if (cfg->do_fork) Esetsid();

  Eclose(1);
      
  if (cfg->chroot_path[0]!='\0') {
    Echdir (cfg->chroot_path);
    Echroot(cfg->chroot_path);
  }
  
  Esetgroups(1, &cfg->gid);
  Esetgid(cfg->gid);
  Esetuid(cfg->uid);

  limitResources(&cfg->ulimits);

  if (cfg->do_fork) return 0;
  else              return getpid();
}

Example #3

File: mount.c Project: carpoon/util-vserver

static void
initMtab(struct Configuration const *cfg)
{
    ENSC_PI_DECLARE(mtab_subpath,  "apps/init/mtab");
    PathInfo		mtab_path  = cfg->cfgdir;
    char			mtab_buf[ENSC_PI_APPSZ(mtab_path, mtab_subpath)];

    PathInfo_append(&mtab_path,  &mtab_subpath,  mtab_buf);
    char const *		mtab = findMtab(mtab_path.d);
    pid_t			pid;
    int			p[2];

    Epipe(p);
    pid = Efork();
    if (pid==0) {
        Undo_detach();
        Eclose(p[1]);

        Echdir(cfg->vdir);
        Echroot(".");

        int		fd = Eopen("/etc/mtab", O_WRONLY|O_CREAT, 0644);
        for (;;) {
            char	buf[4096];
            ssize_t	len = TEMP_FAILURE_RETRY(read(p[0], buf, sizeof buf));
            if (len==0) break;
            if (len==-1) {
                perror("vserver-start: initMtab/read():");
                _exit(1);
            }

            Ewrite(fd, buf, len);
        }
        Eclose(fd);
        Eclose(p[0]);
        _exit(0);
    }
    else {
        Eclose(p[0]);

        if (mtab!=0) {
            int		fd = Eopen(mtab, O_RDONLY, 0644);

            for (;;) {
                char	buf[4096];
                ssize_t	len = TEMP_FAILURE_RETRY(read(fd, buf, sizeof buf));
                if (len==0) break;
                if (len==-1) {
                    perror("vserver-start: initMtab/read():");
                    _exit(1);
                }

                Ewrite(p[1], buf, len);
            }

            Eclose(fd);
        }

        Eclose(p[1]);

        int		status;
        TEMP_FAILURE_RETRY(wait4(pid, &status, 0,0));

        if (!WIFEXITED(status) || WEXITSTATUS(status)!=0) {
            exit(1);
        }
    }
}