// Copyright (c) 2010 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>

#include <algorithm>

#include "client/linux/crash_generation/crash_generation_client.h"
#include "common/linux/eintr_wrapper.h"
#include "common/linux/ignore_ret.h"
#include "common/linux/linux_libc_support.h"
#include "third_party/lss/linux_syscall_support.h"

namespace google_breakpad {

bool
CrashGenerationClient::RequestDump(const void* blob, size_t blob_size)
{
  int fds[2];
  sys_socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
  static const unsigned kControlMsgSize = CMSG_SPACE(sizeof(int));

  struct kernel_msghdr msg;
  my_memset(&msg, 0, sizeof(struct kernel_msghdr));
  struct kernel_iovec iov[1];
  iov[0].iov_base = const_cast<void*>(blob);
  iov[0].iov_len = blob_size;

  msg.msg_iov = iov;
  msg.msg_iovlen = sizeof(iov) / sizeof(iov[0]);
  char cmsg[kControlMsgSize];
  my_memset(cmsg, 0, kControlMsgSize);
  msg.msg_control = cmsg;
  msg.msg_controllen = sizeof(cmsg);

  struct cmsghdr* hdr = CMSG_FIRSTHDR(&msg);
  hdr->cmsg_level = SOL_SOCKET;
  hdr->cmsg_type = SCM_RIGHTS;
  hdr->cmsg_len = CMSG_LEN(sizeof(int));
  int* p = reinterpret_cast<int*>(CMSG_DATA(hdr));
  *p = fds[1];

  ssize_t ret = HANDLE_EINTR(sys_sendmsg(server_fd_, &msg, 0));
  sys_close(fds[1]);
  if (ret <= 0)
    return false;

  // wait for an ACK from the server
  char b;
  IGNORE_RET(HANDLE_EINTR(sys_read(fds[0], &b, 1)));

  return true;
}

//static
CrashGenerationClient*
CrashGenerationClient::TryCreate(int server_fd)
{
  if (0 > server_fd)
    return NULL;
  return new CrashGenerationClient(server_fd);
}

}
