/*
 * Copyright (c) 2012 The Native Client Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

/*
 * NaCl Service Runtime.  I/O Descriptor / Handle abstraction.
 * Bound IMC descriptors.
 */

#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include "native_client/src/include/portability.h"
#include "native_client/src/shared/imc/nacl_imc_c.h"
#include "native_client/src/shared/platform/nacl_log.h"

#include "native_client/src/trusted/desc/nacl_desc_base.h"
#include "native_client/src/trusted/desc/nacl_desc_imc.h"
#include "native_client/src/trusted/desc/nacl_desc_imc_bound_desc.h"

#include "native_client/src/trusted/service_runtime/nacl_config.h"
#include "native_client/src/trusted/service_runtime/include/sys/errno.h"
#include "native_client/src/trusted/service_runtime/include/sys/stat.h"


static struct NaClDescVtbl const kNaClDescImcBoundDescVtbl;  /* fwd */

int NaClDescImcBoundDescCtor(struct NaClDescImcBoundDesc  *self,
                             NaClHandle                   h) {
  struct NaClDesc *basep = (struct NaClDesc *) self;

  basep->base.vtbl = (struct NaClRefCountVtbl const *) NULL;
  if (!NaClDescCtor(basep)) {
    return 0;
  }
  self->h = h;
  basep->base.vtbl = (struct NaClRefCountVtbl const *)
      &kNaClDescImcBoundDescVtbl;
  return 1;
}

static void NaClDescImcBoundDescDtor(struct NaClRefCount *vself) {
  struct NaClDescImcBoundDesc *self = (struct NaClDescImcBoundDesc *) vself;

  (void) NaClClose(self->h);
  self->h = NACL_INVALID_HANDLE;
  vself->vtbl = (struct NaClRefCountVtbl const *) &kNaClDescVtbl;
  (*vself->vtbl->Dtor)(vself);
  return;
}

static int NaClDescImcBoundDescFstat(struct NaClDesc          *vself,
                                     struct nacl_abi_stat     *statbuf) {
  UNREFERENCED_PARAMETER(vself);

  memset(statbuf, 0, sizeof *statbuf);
  statbuf->nacl_abi_st_mode = NACL_ABI_S_IFBOUNDSOCK;
  return 0;
}

static int NaClDescImcBoundDescAcceptConn(struct NaClDesc *vself,
                                          struct NaClDesc **result) {
  /*
   * See NaClDescConnCapConnectAddr code in nacl_desc_conn_cap.c
   */
  struct NaClDescImcBoundDesc *self;
  int                         retval;
  NaClHandle                  nh;
  int                         nbytes;
  struct NaClMessageHeader    conn_msg;
  struct NaClDescImcDesc      *peer;

  self = (struct NaClDescImcBoundDesc *) vself;

  if (NULL == (peer = malloc(sizeof *peer))) {
    return -NACL_ABI_ENOMEM;
  }

  conn_msg.iov = 0;
  conn_msg.iov_length = 0;
  conn_msg.handle_count = 1;
  conn_msg.handles = &nh;
  conn_msg.flags = 0;
  nh = NACL_INVALID_HANDLE;

  NaClLog(3,
          ("NaClDescImcBoundDescAcceptConn(0x%08"NACL_PRIxPTR"):"
           " h = %d\n"),
          (uintptr_t) vself,
          self->h);

  if (-1 == (nbytes = NaClReceiveDatagram(self->h, &conn_msg, 0))) {
    NaClLog(LOG_ERROR,
            ("NaClDescImcBoundDescAcceptConn:"
             " could not receive connection message, errno %d\n"),
            errno);
    retval = -NACL_ABI_EMFILE;
    goto cleanup;
  }
  if (0 != nbytes) {
    NaClLog(LOG_ERROR, ("NaClDescImcBoundDescAcceptConn:"
                        " connection message contains data?!?\n"));
    retval = -NACL_ABI_EMFILE;  /* TODO(bsy): better errno? */
    goto cleanup;
  }
  if (1 != conn_msg.handle_count) {
    NaClLog(LOG_ERROR, ("NaClDescImcBoundDescAcceptConn: connection"
                        " message contains %"NACL_PRIdS" descriptors?!?\n"),
            conn_msg.handle_count);
    retval = -NACL_ABI_EMFILE;  /* TODO(bsy): better errno? */
    goto cleanup;
  }
  if (!NaClDescImcDescCtor(peer, nh)) {
    retval = -NACL_ABI_EMFILE;
    goto cleanup;
  }
  nh = NACL_INVALID_HANDLE;

  *result = (struct NaClDesc *) peer;
  retval = 0;

cleanup:
  if (retval < 0) {
    if (NACL_INVALID_HANDLE != nh) {
      (void) NaClClose(nh);
      nh = NACL_INVALID_HANDLE;
    }
    free(peer);
  }
  return retval;
}

static struct NaClDescVtbl const kNaClDescImcBoundDescVtbl = {
  {
    NaClDescImcBoundDescDtor,
  },
  NaClDescMapNotImplemented,
  NACL_DESC_UNMAP_NOT_IMPLEMENTED
  NaClDescReadNotImplemented,
  NaClDescWriteNotImplemented,
  NaClDescSeekNotImplemented,
  NaClDescPReadNotImplemented,
  NaClDescPWriteNotImplemented,
  NaClDescImcBoundDescFstat,
  NaClDescGetdentsNotImplemented,
  NaClDescExternalizeSizeNotImplemented,
  NaClDescExternalizeNotImplemented,
  NaClDescLockNotImplemented,
  NaClDescTryLockNotImplemented,
  NaClDescUnlockNotImplemented,
  NaClDescWaitNotImplemented,
  NaClDescTimedWaitAbsNotImplemented,
  NaClDescSignalNotImplemented,
  NaClDescBroadcastNotImplemented,
  NaClDescSendMsgNotImplemented,
  NaClDescRecvMsgNotImplemented,
  NaClDescLowLevelSendMsgNotImplemented,
  NaClDescLowLevelRecvMsgNotImplemented,
  NaClDescConnectAddrNotImplemented,
  NaClDescImcBoundDescAcceptConn,
  NaClDescPostNotImplemented,
  NaClDescSemWaitNotImplemented,
  NaClDescGetValueNotImplemented,
  NaClDescSetMetadata,
  NaClDescGetMetadata,
  NaClDescSetFlags,
  NaClDescGetFlags,
  NaClDescIsattyNotImplemented,
  NACL_DESC_BOUND_SOCKET,
};
