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 "client/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 explicit CrashGenerationClientImpl(int server_fd) : server_fd_(server_fd) {} 49 virtual ~CrashGenerationClientImpl() {} 50 51 virtual bool RequestDump(const void* blob, size_t blob_size) { 52 int fds[2]; 53 if (sys_pipe(fds) < 0) 54 return false; 55 static const unsigned kControlMsgSize = CMSG_SPACE(sizeof(int)); 56 57 struct kernel_iovec iov; 58 iov.iov_base = const_cast<void*>(blob); 59 iov.iov_len = blob_size; 60 61 struct kernel_msghdr msg = { 0 }; 62 msg.msg_iov = &iov; 63 msg.msg_iovlen = 1; 64 char cmsg[kControlMsgSize] = ""; 65 msg.msg_control = cmsg; 66 msg.msg_controllen = sizeof(cmsg); 67 68 struct cmsghdr* hdr = CMSG_FIRSTHDR(&msg); 69 hdr->cmsg_level = SOL_SOCKET; 70 hdr->cmsg_type = SCM_RIGHTS; 71 hdr->cmsg_len = CMSG_LEN(sizeof(int)); 72 int* p = reinterpret_cast<int*>(CMSG_DATA(hdr)); 73 *p = fds[1]; 74 75 ssize_t ret = HANDLE_EINTR(sys_sendmsg(server_fd_, &msg, 0)); 76 sys_close(fds[1]); 77 if (ret < 0) { 78 sys_close(fds[0]); 79 return false; 80 } 81 82 // Wait for an ACK from the server. 83 char b; 84 IGNORE_RET(HANDLE_EINTR(sys_read(fds[0], &b, 1))); 85 sys_close(fds[0]); 86 87 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 CrashGenerationClient* CrashGenerationClient::TryCreate(int server_fd) { 100 if (server_fd < 0) 101 return NULL; 102 return new CrashGenerationClientImpl(server_fd); 103 } 104 105 } // namespace google_breakpad 106
