Exemplo n.º 1
0
/* hand off the command. return child connection to the main program */
afp_child_t *dsi_getsession(DSI *dsi, server_child *serv_children, int tickleval)
{
  pid_t pid;
  unsigned int ipc_fds[2];  
  afp_child_t *child;

  if (socketpair(PF_UNIX, SOCK_STREAM, 0, ipc_fds) < 0) {
      LOG(log_error, logtype_dsi, "dsi_getsess: %s", strerror(errno));
      exit( EXITERR_CLNT );
  }

  if (setnonblock(ipc_fds[0], 1) != 0 || setnonblock(ipc_fds[1], 1) != 0) {
      LOG(log_error, logtype_dsi, "dsi_getsess: setnonblock: %s", strerror(errno));
      exit(EXITERR_CLNT);
  }

  switch (pid = dsi->proto_open(dsi)) { /* in libatalk/dsi/dsi_tcp.c */
  case -1:
    /* if we fail, just return. it might work later */
    LOG(log_error, logtype_dsi, "dsi_getsess: %s", strerror(errno));
    return NULL;

  case 0: /* child. mostly handled below. */
    break;

  default: /* parent */
    /* using SIGQUIT is hokey, but the child might not have
     * re-established its signal handler for SIGTERM yet. */
    if ((child = server_child_add(serv_children, CHILD_DSIFORK, pid, ipc_fds)) < 0) {
      LOG(log_error, logtype_dsi, "dsi_getsess: %s", strerror(errno));
      dsi->header.dsi_flags = DSIFL_REPLY;
      dsi->header.dsi_code = DSIERR_SERVBUSY;
      dsi_send(dsi);
      dsi->header.dsi_code = DSIERR_OK;
      kill(pid, SIGQUIT);
    }
    dsi->proto_close(dsi);
    return child;
  }
  
  /* child: check number of open connections. this is one off the
   * actual count. */
  if ((serv_children->count >= serv_children->nsessions) &&
      (dsi->header.dsi_command == DSIFUNC_OPEN)) {
    LOG(log_info, logtype_dsi, "dsi_getsess: too many connections");
    dsi->header.dsi_flags = DSIFL_REPLY;
    dsi->header.dsi_code = DSIERR_TOOMANY;
    dsi_send(dsi);
    exit(EXITERR_CLNT);
  }

  /* get rid of some stuff */
  close(dsi->serversock);
  server_child_free(serv_children); 

  switch (dsi->header.dsi_command) {
  case DSIFUNC_STAT: /* send off status and return */
    {
      /* OpenTransport 1.1.2 bug workaround: 
       *
       * OT code doesn't currently handle close sockets well. urk.
       * the workaround: wait for the client to close its
       * side. timeouts prevent indefinite resource use. 
       */
      
      static struct timeval timeout = {120, 0};
      fd_set readfds;
      
      dsi_getstatus(dsi);

      FD_ZERO(&readfds);
      FD_SET(dsi->socket, &readfds);
      free(dsi);
      select(FD_SETSIZE, &readfds, NULL, NULL, &timeout);    
      exit(0);
    }
    break;
    
  case DSIFUNC_OPEN: /* setup session */
    /* set up the tickle timer */
    dsi->timer.it_interval.tv_sec = dsi->timer.it_value.tv_sec = tickleval;
    dsi->timer.it_interval.tv_usec = dsi->timer.it_value.tv_usec = 0;
    signal(SIGPIPE, SIG_IGN); /* we catch these ourselves */
    dsi_opensession(dsi);
    if ((child = calloc(1, sizeof(afp_child_t))) == NULL)
        exit(EXITERR_SYS);
    child->ipc_fds[1] = ipc_fds[1];
    return child;
    break;

  default: /* just close */
    LOG(log_info, logtype_dsi, "DSIUnknown %d", dsi->header.dsi_command);
    dsi->proto_close(dsi);
    exit(EXITERR_CLNT);
  }
}
Exemplo n.º 2
0
int main(int ac, char **av)
{
    AFPConfig           *config;
    fd_set              rfds;
    void                *ipc;
    struct sigaction	sv;
    sigset_t            sigs;
    int                 ret;

#ifdef TRU64
    argc = ac;
    argv = av;
    set_auth_parameters( ac, av );
#endif /* TRU64 */

    /* Log SIGBUS/SIGSEGV SBT */
    fault_setup(NULL);

    /* Default log setup: log to syslog */
    setuplog("default log_note");

    afp_options_init(&default_options);
    if (!afp_options_parse(ac, av, &default_options))
        exit(EXITERR_CONF);

    /* Save the user's current umask for use with CNID (and maybe some 
     * other things, too). */
    default_options.save_mask = umask( default_options.umask );

    switch(server_lock("afpd", default_options.pidfile,
                       default_options.flags & OPTION_DEBUG)) {
    case -1: /* error */
        exit(EXITERR_SYS);
    case 0: /* child */
        break;
    default: /* server */
        exit(0);
    }
    atexit(afp_exit);

    /* install child handler for asp and dsi. we do this before afp_goaway
     * as afp_goaway references stuff from here. 
     * XXX: this should really be setup after the initial connections. */
    if (!(server_children = server_child_alloc(default_options.connections,
                            CHILD_NFORKS))) {
        LOG(log_error, logtype_afpd, "main: server_child alloc: %s", strerror(errno) );
        exit(EXITERR_SYS);
    }

    memset(&sv, 0, sizeof(sv));    
    /* linux at least up to 2.4.22 send a SIGXFZ for vfat fs,
       even if the file is open with O_LARGEFILE ! */
#ifdef SIGXFSZ
    sv.sa_handler = SIG_IGN;
    sigemptyset( &sv.sa_mask );
    if (sigaction(SIGXFSZ, &sv, NULL ) < 0 ) {
        LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
        exit(EXITERR_SYS);
    }
#endif
    
    sv.sa_handler = child_handler;
    sigemptyset( &sv.sa_mask );
    sigaddset(&sv.sa_mask, SIGALRM);
    sigaddset(&sv.sa_mask, SIGHUP);
    sigaddset(&sv.sa_mask, SIGTERM);
    sigaddset(&sv.sa_mask, SIGUSR1);
    sigaddset(&sv.sa_mask, SIGQUIT);    
    sv.sa_flags = SA_RESTART;
    if ( sigaction( SIGCHLD, &sv, NULL ) < 0 ) {
        LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
        exit(EXITERR_SYS);
    }

    sv.sa_handler = afp_goaway;
    sigemptyset( &sv.sa_mask );
    sigaddset(&sv.sa_mask, SIGALRM);
    sigaddset(&sv.sa_mask, SIGTERM);
    sigaddset(&sv.sa_mask, SIGHUP);
    sigaddset(&sv.sa_mask, SIGCHLD);
    sigaddset(&sv.sa_mask, SIGQUIT);
    sv.sa_flags = SA_RESTART;
    if ( sigaction( SIGUSR1, &sv, NULL ) < 0 ) {
        LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
        exit(EXITERR_SYS);
    }

    sigemptyset( &sv.sa_mask );
    sigaddset(&sv.sa_mask, SIGALRM);
    sigaddset(&sv.sa_mask, SIGTERM);
    sigaddset(&sv.sa_mask, SIGUSR1);
    sigaddset(&sv.sa_mask, SIGCHLD);
    sigaddset(&sv.sa_mask, SIGQUIT);
    sv.sa_flags = SA_RESTART;
    if ( sigaction( SIGHUP, &sv, NULL ) < 0 ) {
        LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
        exit(EXITERR_SYS);
    }


    sigemptyset( &sv.sa_mask );
    sigaddset(&sv.sa_mask, SIGALRM);
    sigaddset(&sv.sa_mask, SIGHUP);
    sigaddset(&sv.sa_mask, SIGUSR1);
    sigaddset(&sv.sa_mask, SIGCHLD);
    sigaddset(&sv.sa_mask, SIGQUIT);
    sv.sa_flags = SA_RESTART;
    if ( sigaction( SIGTERM, &sv, NULL ) < 0 ) {
        LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
        exit(EXITERR_SYS);
    }

    sigemptyset( &sv.sa_mask );
    sigaddset(&sv.sa_mask, SIGALRM);
    sigaddset(&sv.sa_mask, SIGHUP);
    sigaddset(&sv.sa_mask, SIGUSR1);
    sigaddset(&sv.sa_mask, SIGCHLD);
    sigaddset(&sv.sa_mask, SIGTERM);
    sv.sa_flags = SA_RESTART;
    if (sigaction(SIGQUIT, &sv, NULL ) < 0 ) {
        LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
        exit(EXITERR_SYS);
    }

    /* afpd.conf: not in config file: lockfile, connections, configfile
     *            preference: command-line provides defaults.
     *                        config file over-writes defaults.
     *
     * we also need to make sure that killing afpd during startup
     * won't leave any lingering registered names around.
     */

    sigemptyset(&sigs);
    sigaddset(&sigs, SIGALRM);
    sigaddset(&sigs, SIGHUP);
    sigaddset(&sigs, SIGUSR1);
#if 0
    /* don't block SIGTERM */
    sigaddset(&sigs, SIGTERM);
#endif
    sigaddset(&sigs, SIGCHLD);

    pthread_sigmask(SIG_BLOCK, &sigs, NULL);
    if (!(configs = configinit(&default_options))) {
        LOG(log_error, logtype_afpd, "main: no servers configured");
        exit(EXITERR_CONF);
    }
    pthread_sigmask(SIG_UNBLOCK, &sigs, NULL);

    /* Register CNID  */
    cnid_init();

    /* watch atp, dsi sockets and ipc parent/child file descriptor. */
    disasociated_ipc_fd = ipc_server_uds(_PATH_AFP_IPC);
    fd_set_listening_sockets();

    /* set limits */
    (void)setlimits();

    afp_child_t *child;
    int fd[2];  /* we only use one, but server_child_add expects [2] */
    pid_t pid;

    /* wait for an appleshare connection. parent remains in the loop
     * while the children get handled by afp_over_{asp,dsi}.  this is
     * currently vulnerable to a denial-of-service attack if a
     * connection is made without an actual login attempt being made
     * afterwards. establishing timeouts for logins is a possible 
     * solution. */
    while (1) {
        LOG(log_maxdebug, logtype_afpd, "main: polling %i fds", fdset_used);
        pthread_sigmask(SIG_UNBLOCK, &sigs, NULL);
        ret = poll(fdset, fdset_used, -1);
        pthread_sigmask(SIG_BLOCK, &sigs, NULL);
        int saveerrno = errno;

        if (reloadconfig) {
            nologin++;
            auth_unload();
            fd_reset_listening_sockets();

            LOG(log_info, logtype_afpd, "re-reading configuration file");
            for (config = configs; config; config = config->next)
                if (config->server_cleanup)
                    config->server_cleanup(config);

            /* configfree close atp socket used for DDP tickle, there's an issue
             * with atp tid. */
            configfree(configs, NULL);
            if (!(configs = configinit(&default_options))) {
                LOG(log_error, logtype_afpd, "config re-read: no servers configured");
                exit(EXITERR_CONF);
            }

            fd_set_listening_sockets();

            nologin = 0;
            reloadconfig = 0;
            errno = saveerrno;
            continue;
        }

        if (ret == 0)
            continue;
        
        if (ret < 0) {
            if (errno == EINTR)
                continue;
            LOG(log_error, logtype_afpd, "main: can't wait for input: %s", strerror(errno));
            break;
        }

        for (int i = 0; i < fdset_used; i++) {
            if (fdset[i].revents & (POLLIN | POLLERR | POLLHUP)) {
                switch (polldata[i].fdtype) {

                case LISTEN_FD:
                    config = (AFPConfig *)polldata[i].data;
                    /* config->server_start is afp_config.c:dsi_start() for DSI */
                    if (child = config->server_start(config, configs, server_children)) {
                        /* Add IPC fd to select fd set */
                        fdset_add_fd(&fdset, &polldata, &fdset_used, &fdset_size, child->ipc_fds[0], IPC_FD, child);
                    }
                    break;

                case IPC_FD:
                    child = (afp_child_t *)polldata[i].data;
                    LOG(log_debug, logtype_afpd, "main: IPC request from child[%u]", child->pid);

                    if (ipc_server_read(server_children, child->ipc_fds[0]) != 0) {
                        fdset_del_fd(&fdset, &polldata, &fdset_used, &fdset_size, child->ipc_fds[0]);
                        close(child->ipc_fds[0]);
                        child->ipc_fds[0] = -1;
                        if (child->disasociated) {
                            LOG(log_note, logtype_afpd, "main: removing reattached child[%u]", child->pid);
                            server_child_remove(server_children, CHILD_DSIFORK, child->pid);
                        }
                    }
                    break;

                case DISASOCIATED_IPC_FD:
                    LOG(log_debug, logtype_afpd, "main: IPC reconnect request");
                    if ((fd[0] = accept(disasociated_ipc_fd, NULL, NULL)) == -1) {
                        LOG(log_error, logtype_afpd, "main: accept: %s", strerror(errno));
                        break;
                    }
                    if (readt(fd[0], &pid, sizeof(pid_t), 0, 1) != sizeof(pid_t)) {
                        LOG(log_error, logtype_afpd, "main: readt: %s", strerror(errno));
                        close(fd[0]);
                        break;
                    }
                    LOG(log_note, logtype_afpd, "main: IPC reconnect from pid [%u]", pid);
                    if ((child = server_child_add(server_children, CHILD_DSIFORK, pid, fd)) == NULL) {
                        LOG(log_error, logtype_afpd, "main: server_child_add");
                        close(fd[0]);
                        break;
                    }
                    child->disasociated = 1;
                    fdset_add_fd(&fdset, &polldata, &fdset_used, &fdset_size, fd[0], IPC_FD, child);
                    break;

                default:
                    LOG(log_debug, logtype_afpd, "main: IPC request for unknown type");
                    break;
                } /* switch */
            }  /* if */
        } /* for (i)*/
    } /* while (1) */

    return 0;
}
Exemplo n.º 3
0
int main(int ac, char **av)
{
    fd_set              rfds;
    void                *ipc;
    struct sigaction	sv;
    sigset_t            sigs;
    int                 ret;

    /* Parse argv args and initialize default options */
    afp_options_parse_cmdline(&obj, ac, av);

    if (!(obj.cmdlineflags & OPTION_DEBUG) && (daemonize(0, 0) != 0))
        exit(EXITERR_SYS);

    /* Log SIGBUS/SIGSEGV SBT */
    fault_setup(NULL);

    if (afp_config_parse(&obj, "afpd") != 0)
        afp_exit(EXITERR_CONF);

    /* Save the user's current umask */
    obj.options.save_mask = umask(obj.options.umask);

    /* install child handler for asp and dsi. we do this before afp_goaway
     * as afp_goaway references stuff from here. 
     * XXX: this should really be setup after the initial connections. */
    if (!(server_children = server_child_alloc(obj.options.connections, CHILD_NFORKS))) {
        LOG(log_error, logtype_afpd, "main: server_child alloc: %s", strerror(errno) );
        afp_exit(EXITERR_SYS);
    }
    
    sigemptyset(&sigs);
    pthread_sigmask(SIG_SETMASK, &sigs, NULL);

    memset(&sv, 0, sizeof(sv));    
    /* linux at least up to 2.4.22 send a SIGXFZ for vfat fs,
       even if the file is open with O_LARGEFILE ! */
#ifdef SIGXFSZ
    sv.sa_handler = SIG_IGN;
    sigemptyset( &sv.sa_mask );
    if (sigaction(SIGXFSZ, &sv, NULL ) < 0 ) {
        LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
        afp_exit(EXITERR_SYS);
    }
#endif
    
    sv.sa_handler = afp_goaway; /* handler for all sigs */

    sigemptyset( &sv.sa_mask );
    sigaddset(&sv.sa_mask, SIGALRM);
    sigaddset(&sv.sa_mask, SIGHUP);
    sigaddset(&sv.sa_mask, SIGTERM);
    sigaddset(&sv.sa_mask, SIGUSR1);
    sigaddset(&sv.sa_mask, SIGQUIT);    
    sv.sa_flags = SA_RESTART;
    if ( sigaction( SIGCHLD, &sv, NULL ) < 0 ) {
        LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
        afp_exit(EXITERR_SYS);
    }

    sigemptyset( &sv.sa_mask );
    sigaddset(&sv.sa_mask, SIGALRM);
    sigaddset(&sv.sa_mask, SIGTERM);
    sigaddset(&sv.sa_mask, SIGHUP);
    sigaddset(&sv.sa_mask, SIGCHLD);
    sigaddset(&sv.sa_mask, SIGQUIT);
    sv.sa_flags = SA_RESTART;
    if ( sigaction( SIGUSR1, &sv, NULL ) < 0 ) {
        LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
        afp_exit(EXITERR_SYS);
    }

    sigemptyset( &sv.sa_mask );
    sigaddset(&sv.sa_mask, SIGALRM);
    sigaddset(&sv.sa_mask, SIGTERM);
    sigaddset(&sv.sa_mask, SIGUSR1);
    sigaddset(&sv.sa_mask, SIGCHLD);
    sigaddset(&sv.sa_mask, SIGQUIT);
    sv.sa_flags = SA_RESTART;
    if ( sigaction( SIGHUP, &sv, NULL ) < 0 ) {
        LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
        afp_exit(EXITERR_SYS);
    }

    sigemptyset( &sv.sa_mask );
    sigaddset(&sv.sa_mask, SIGALRM);
    sigaddset(&sv.sa_mask, SIGHUP);
    sigaddset(&sv.sa_mask, SIGUSR1);
    sigaddset(&sv.sa_mask, SIGCHLD);
    sigaddset(&sv.sa_mask, SIGQUIT);
    sv.sa_flags = SA_RESTART;
    if ( sigaction( SIGTERM, &sv, NULL ) < 0 ) {
        LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
        afp_exit(EXITERR_SYS);
    }

    sigemptyset( &sv.sa_mask );
    sigaddset(&sv.sa_mask, SIGALRM);
    sigaddset(&sv.sa_mask, SIGHUP);
    sigaddset(&sv.sa_mask, SIGUSR1);
    sigaddset(&sv.sa_mask, SIGCHLD);
    sigaddset(&sv.sa_mask, SIGTERM);
    sv.sa_flags = SA_RESTART;
    if (sigaction(SIGQUIT, &sv, NULL ) < 0 ) {
        LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
        afp_exit(EXITERR_SYS);
    }

    /* afp.conf:  not in config file: lockfile, configfile
     *            preference: command-line provides defaults.
     *                        config file over-writes defaults.
     *
     * we also need to make sure that killing afpd during startup
     * won't leave any lingering registered names around.
     */

    sigemptyset(&sigs);
    sigaddset(&sigs, SIGALRM);
    sigaddset(&sigs, SIGHUP);
    sigaddset(&sigs, SIGUSR1);
#if 0
    /* don't block SIGTERM */
    sigaddset(&sigs, SIGTERM);
#endif
    sigaddset(&sigs, SIGCHLD);

    pthread_sigmask(SIG_BLOCK, &sigs, NULL);
    if (configinit(&obj) != 0) {
        LOG(log_error, logtype_afpd, "main: no servers configured");
        afp_exit(EXITERR_CONF);
    }
    pthread_sigmask(SIG_UNBLOCK, &sigs, NULL);

    /* Initialize */
    cnid_init();
    
    /* watch atp, dsi sockets and ipc parent/child file descriptor. */

    if (obj.options.flags & OPTION_KEEPSESSIONS) {
        LOG(log_note, logtype_afpd, "Activating continous service");
        disasociated_ipc_fd = ipc_server_uds(_PATH_AFP_IPC);
    }

    fd_set_listening_sockets(&obj);

    /* set limits */
    (void)setlimits();

    afp_child_t *child;
    int recon_ipc_fd;
    pid_t pid;
    int saveerrno;

    /* wait for an appleshare connection. parent remains in the loop
     * while the children get handled by afp_over_{asp,dsi}.  this is
     * currently vulnerable to a denial-of-service attack if a
     * connection is made without an actual login attempt being made
     * afterwards. establishing timeouts for logins is a possible 
     * solution. */
    while (1) {
        LOG(log_maxdebug, logtype_afpd, "main: polling %i fds", fdset_used);
        pthread_sigmask(SIG_UNBLOCK, &sigs, NULL);
        ret = poll(fdset, fdset_used, -1);
        pthread_sigmask(SIG_BLOCK, &sigs, NULL);
        saveerrno = errno;

        if (gotsigchld) {
            gotsigchld = 0;
            child_handler();
            continue;
        }

        if (reloadconfig) {
            nologin++;
            auth_unload();
            fd_reset_listening_sockets(&obj);

            LOG(log_info, logtype_afpd, "re-reading configuration file");

            configfree(&obj, NULL);
            if (configinit(&obj) != 0) {
                LOG(log_error, logtype_afpd, "config re-read: no servers configured");
                afp_exit(EXITERR_CONF);
            }

            fd_set_listening_sockets(&obj);

            nologin = 0;
            reloadconfig = 0;
            errno = saveerrno;
            continue;
        }

        if (ret == 0)
            continue;
        
        if (ret < 0) {
            if (errno == EINTR)
                continue;
            LOG(log_error, logtype_afpd, "main: can't wait for input: %s", strerror(errno));
            break;
        }

        for (int i = 0; i < fdset_used; i++) {
            if (fdset[i].revents & (POLLIN | POLLERR | POLLHUP | POLLNVAL)) {
                switch (polldata[i].fdtype) {

                case LISTEN_FD:
                    if (child = dsi_start(&obj, (DSI *)polldata[i].data, server_children)) {
                        /* Add IPC fd to select fd set */
                        fdset_add_fd(obj.options.connections + AFP_LISTENERS + FDSET_SAFETY,
                                     &fdset,
                                     &polldata,
                                     &fdset_used,
                                     &fdset_size,
                                     child->ipc_fd,
                                     IPC_FD,
                                     child);
                    }
                    break;

                case IPC_FD:
                    child = (afp_child_t *)polldata[i].data;
                    LOG(log_debug, logtype_afpd, "main: IPC request from child[%u]", child->pid);

                    if (ipc_server_read(server_children, child->ipc_fd) != 0) {
                        fdset_del_fd(&fdset, &polldata, &fdset_used, &fdset_size, child->ipc_fd);
                        close(child->ipc_fd);
                        child->ipc_fd = -1;
                        if ((obj.options.flags & OPTION_KEEPSESSIONS) && child->disasociated) {
                            LOG(log_note, logtype_afpd, "main: removing reattached child[%u]", child->pid);
                            server_child_remove(server_children, CHILD_DSIFORK, child->pid);
                        }
                    }
                    break;

                case DISASOCIATED_IPC_FD:
                    LOG(log_debug, logtype_afpd, "main: IPC reconnect request");
                    if ((recon_ipc_fd = accept(disasociated_ipc_fd, NULL, NULL)) == -1) {
                        LOG(log_error, logtype_afpd, "main: accept: %s", strerror(errno));
                        break;
                    }
                    if (readt(recon_ipc_fd, &pid, sizeof(pid_t), 0, 1) != sizeof(pid_t)) {
                        LOG(log_error, logtype_afpd, "main: readt: %s", strerror(errno));
                        close(recon_ipc_fd);
                        break;
                    }
                    LOG(log_note, logtype_afpd, "main: IPC reconnect from pid [%u]", pid);

                    if ((child = server_child_add(server_children, CHILD_DSIFORK, pid, recon_ipc_fd)) == NULL) {
                        LOG(log_error, logtype_afpd, "main: server_child_add");
                        close(recon_ipc_fd);
                        break;
                    }
                    child->disasociated = 1;
                    fdset_add_fd(obj.options.connections + AFP_LISTENERS + FDSET_SAFETY,
                                 &fdset,
                                 &polldata,
                                 &fdset_used,
                                 &fdset_size,
                                 recon_ipc_fd,
                                 IPC_FD,
                                 child);
                    break;

                default:
                    LOG(log_debug, logtype_afpd, "main: IPC request for unknown type");
                    break;
                } /* switch */
            }  /* if */
        } /* for (i)*/
    } /* while (1) */

    return 0;
}