btif/src/btif_sock_util.cc

/******************************************************************************
 *
 *  Copyright 2009-2012 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

#define LOG_TAG "bt_btif_sock"

#include "btif_sock_util.h"

#include <arpa/inet.h>
#include <errno.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>

#include <hardware/bluetooth.h>
#include <hardware/bt_sock.h>

#include "bt_target.h"
#include "btif_util.h"
#include "osi/include/osi.h"

#define asrt(s)                                                              \
  do {                                                                       \
    if (!(s))                                                                \
      BTIF_TRACE_ERROR("## %s assert %s failed at line:%d ##", __func__, #s, \
                       __LINE__)                                             \
  } while (0)

int sock_send_all(int sock_fd, const uint8_t* buf, int len) {
  int s = len;

  while (s) {
    ssize_t ret;
    OSI_NO_INTR(ret = send(sock_fd, buf, s, 0));
    if (ret <= 0) {
      BTIF_TRACE_ERROR("sock fd:%d send errno:%d, ret:%d", sock_fd, errno, ret);
      return -1;
    }
    buf += ret;
    s -= ret;
  }
  return len;
}
int sock_recv_all(int sock_fd, uint8_t* buf, int len) {
  int r = len;

  while (r) {
    ssize_t ret;
    OSI_NO_INTR(ret = recv(sock_fd, buf, r, MSG_WAITALL));
    if (ret <= 0) {
      BTIF_TRACE_ERROR("sock fd:%d recv errno:%d, ret:%d", sock_fd, errno, ret);
      return -1;
    }
    buf += ret;
    r -= ret;
  }
  return len;
}

int sock_send_fd(int sock_fd, const uint8_t* buf, int len, int send_fd) {
  struct msghdr msg;
  unsigned char* buffer = (unsigned char*)buf;
  memset(&msg, 0, sizeof(msg));

  struct cmsghdr* cmsg;
  char msgbuf[CMSG_SPACE(1)];
  asrt(send_fd != -1);
  if (sock_fd == -1 || send_fd == -1) return -1;
  // Add any pending outbound file descriptors to the message
  // See "man cmsg" really
  msg.msg_control = msgbuf;
  msg.msg_controllen = sizeof msgbuf;
  cmsg = CMSG_FIRSTHDR(&msg);
  cmsg->cmsg_level = SOL_SOCKET;
  cmsg->cmsg_type = SCM_RIGHTS;
  cmsg->cmsg_len = CMSG_LEN(sizeof send_fd);
  memcpy(CMSG_DATA(cmsg), &send_fd, sizeof send_fd);

  // We only write our msg_control during the first write
  int ret_len = len;
  while (len > 0) {
    struct iovec iv;
    memset(&iv, 0, sizeof(iv));

    iv.iov_base = buffer;
    iv.iov_len = len;

    msg.msg_iov = &iv;
    msg.msg_iovlen = 1;

    ssize_t ret;
    OSI_NO_INTR(ret = sendmsg(sock_fd, &msg, MSG_NOSIGNAL));
    if (ret < 0) {
      BTIF_TRACE_ERROR("fd:%d, send_fd:%d, sendmsg ret:%d, errno:%d, %s",
                       sock_fd, send_fd, (int)ret, errno, strerror(errno));
      ret_len = -1;
      break;
    }

    buffer += ret;
    len -= ret;

    // Wipes out any msg_control too
    memset(&msg, 0, sizeof(msg));
  }
  BTIF_TRACE_DEBUG("close fd:%d after sent", send_fd);
  // TODO: This seems wrong - if the FD is not opened in JAVA before this is
  // called
  //       we get a "socket closed" exception in java, when reading from the
  //       socket...
  close(send_fd);
  return ret_len;
}