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 | |