crash_generation_client.cc

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// 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

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// 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

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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

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#include "linux/crash_generation/crash_generation_client.h"

#include <stdio.h>

#include <sys/socket.h>

#include <sys/types.h>

#include <algorithm>

#include "common/linux/eintr_wrapper.h"

#include "common/linux/ignore_ret.h"

#include "third_party/lss/linux_syscall_support.h"

namespace google_breakpad {

namespace {

class CrashGenerationClientImpl : public CrashGenerationClient {

 public:

  explicit CrashGenerationClientImpl(int server_fd) : server_fd_(server_fd) {}

  virtual ~CrashGenerationClientImpl() {}

  virtual bool RequestDump(const void* blob, size_t blob_size) {

    int fds[2];

    if (sys_pipe(fds) < 0)

      return false;

    static const unsigned kControlMsgSize = CMSG_SPACE(sizeof(int));

    struct kernel_iovec iov;

    iov.iov_base = const_cast<void*>(blob);

    iov.iov_len = blob_size;

    struct kernel_msghdr msg = { 0 };

    msg.msg_iov = &iov;

    msg.msg_iovlen = 1;

    char cmsg[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) {

      sys_close(fds[0]);

      return false;

    // Wait for an ACK from the server.

    char b;

    IGNORE_RET(HANDLE_EINTR(sys_read(fds[0], &b, 1)));

    sys_close(fds[0]);

    return true;

 private:

  int server_fd_;

  DISALLOW_COPY_AND_ASSIGN(CrashGenerationClientImpl);

};

}  // namespace

// static

CrashGenerationClient* CrashGenerationClient::TryCreate(int server_fd) {

  if (server_fd < 0)

    return NULL;

  return new CrashGenerationClientImpl(server_fd);

}  // namespace google_breakpad