Line data    Source code

       1             : // Copyright (c) 2010 Google Inc.
       2             : // All rights reserved.
       3             : //
       4             : // Redistribution and use in source and binary forms, with or without
       5             : // modification, are permitted provided that the following conditions are
       6             : // met:
       7             : //
       8             : //     * Redistributions of source code must retain the above copyright
       9             : // notice, this list of conditions and the following disclaimer.
      10             : //     * Redistributions in binary form must reproduce the above
      11             : // copyright notice, this list of conditions and the following disclaimer
      12             : // in the documentation and/or other materials provided with the
      13             : // distribution.
      14             : //     * Neither the name of Google Inc. nor the names of its
      15             : // contributors may be used to endorse or promote products derived from
      16             : // this software without specific prior written permission.
      17             : //
      18             : // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      19             : // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      20             : // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      21             : // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      22             : // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      23             : // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      24             : // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      25             : // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      26             : // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      27             : // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      28             : // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      29             : 
      30             : #include "linux/crash_generation/crash_generation_client.h"
      31             : 
      32             : #include <stdio.h>
      33             : #include <sys/socket.h>
      34             : #include <sys/types.h>
      35             : 
      36             : #include <algorithm>
      37             : 
      38             : #include "common/linux/eintr_wrapper.h"
      39             : #include "common/linux/ignore_ret.h"
      40             : #include "third_party/lss/linux_syscall_support.h"
      41             : 
      42             : namespace google_breakpad {
      43             : 
      44             : namespace {
      45             : 
      46             : class CrashGenerationClientImpl : public CrashGenerationClient {
      47             :  public:
      48           0 :   explicit CrashGenerationClientImpl(int server_fd) : server_fd_(server_fd) {}
      49           0 :   virtual ~CrashGenerationClientImpl() {}
      50             : 
      51           0 :   virtual bool RequestDump(const void* blob, size_t blob_size) {
      52             :     int fds[2];
      53           0 :     if (sys_pipe(fds) < 0)
      54           0 :       return false;
      55             :     static const unsigned kControlMsgSize = CMSG_SPACE(sizeof(int));
      56             : 
      57             :     struct kernel_iovec iov;
      58           0 :     iov.iov_base = const_cast<void*>(blob);
      59           0 :     iov.iov_len = blob_size;
      60             : 
      61           0 :     struct kernel_msghdr msg = { 0 };
      62           0 :     msg.msg_iov = &iov;
      63           0 :     msg.msg_iovlen = 1;
      64           0 :     char cmsg[kControlMsgSize] = "";
      65           0 :     msg.msg_control = cmsg;
      66           0 :     msg.msg_controllen = sizeof(cmsg);
      67             : 
      68           0 :     struct cmsghdr* hdr = CMSG_FIRSTHDR(&msg);
      69           0 :     hdr->cmsg_level = SOL_SOCKET;
      70           0 :     hdr->cmsg_type = SCM_RIGHTS;
      71           0 :     hdr->cmsg_len = CMSG_LEN(sizeof(int));
      72           0 :     int* p = reinterpret_cast<int*>(CMSG_DATA(hdr));
      73           0 :     *p = fds[1];
      74             : 
      75           0 :     ssize_t ret = HANDLE_EINTR(sys_sendmsg(server_fd_, &msg, 0));
      76           0 :     sys_close(fds[1]);
      77           0 :     if (ret < 0) {
      78           0 :       sys_close(fds[0]);
      79           0 :       return false;
      80             :     }
      81             : 
      82             :     // Wait for an ACK from the server.
      83             :     char b;
      84           0 :     IGNORE_RET(HANDLE_EINTR(sys_read(fds[0], &b, 1)));
      85           0 :     sys_close(fds[0]);
      86             : 
      87           0 :     return true;
      88             :   }
      89             : 
      90             :  private:
      91             :   int server_fd_;
      92             : 
      93             :   DISALLOW_COPY_AND_ASSIGN(CrashGenerationClientImpl);
      94             : };
      95             : 
      96             : }  // namespace
      97             : 
      98             : // static
      99           0 : CrashGenerationClient* CrashGenerationClient::TryCreate(int server_fd) {
     100           0 :   if (server_fd < 0)
     101           0 :     return NULL;
     102           0 :   return new CrashGenerationClientImpl(server_fd);
     103             : }
     104             : 
     105             : }  // namespace google_breakpad