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1 // Copyright (c) 2008, 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/windows/crash_generation/client_info.h"
31 #include "client/windows/common/ipc_protocol.h"
32 
33 static const wchar_t kCustomInfoProcessUptimeName[] = L"ptime";
34 static const size_t kMaxCustomInfoEntries = 4096;
35 
36 namespace google_breakpad {
37 
ClientInfo(CrashGenerationServer * crash_server,DWORD pid,MINIDUMP_TYPE dump_type,DWORD * thread_id,EXCEPTION_POINTERS ** ex_info,MDRawAssertionInfo * assert_info,const CustomClientInfo & custom_client_info)38 ClientInfo::ClientInfo(CrashGenerationServer* crash_server,
39                        DWORD pid,
40                        MINIDUMP_TYPE dump_type,
41                        DWORD* thread_id,
42                        EXCEPTION_POINTERS** ex_info,
43                        MDRawAssertionInfo* assert_info,
44                        const CustomClientInfo& custom_client_info)
45     : crash_server_(crash_server),
46       pid_(pid),
47       dump_type_(dump_type),
48       ex_info_(ex_info),
49       assert_info_(assert_info),
50       custom_client_info_(custom_client_info),
51       thread_id_(thread_id),
52       process_handle_(NULL),
53       dump_requested_handle_(NULL),
54       dump_generated_handle_(NULL),
55       dump_request_wait_handle_(NULL),
56       process_exit_wait_handle_(NULL),
57       crash_id_(NULL) {
58   GetSystemTimeAsFileTime(&start_time_);
59 }
60 
Initialize()61 bool ClientInfo::Initialize() {
62   process_handle_ = OpenProcess(GENERIC_ALL, FALSE, pid_);
63   if (!process_handle_) {
64     return false;
65   }
66 
67   // The crash_id will be the low order word of the process creation time.
68   FILETIME creation_time, exit_time, kernel_time, user_time;
69   if (GetProcessTimes(process_handle_, &creation_time, &exit_time,
70                       &kernel_time, &user_time)) {
71     start_time_ = creation_time;
72   }
73   crash_id_ = start_time_.dwLowDateTime;
74 
75   dump_requested_handle_ = CreateEvent(NULL,    // Security attributes.
76                                        TRUE,    // Manual reset.
77                                        FALSE,   // Initial state.
78                                        NULL);   // Name.
79   if (!dump_requested_handle_) {
80     return false;
81   }
82 
83   dump_generated_handle_ = CreateEvent(NULL,    // Security attributes.
84                                        TRUE,    // Manual reset.
85                                        FALSE,   // Initial state.
86                                        NULL);   // Name.
87   return dump_generated_handle_ != NULL;
88 }
89 
UnregisterDumpRequestWaitAndBlockUntilNoPending()90 void ClientInfo::UnregisterDumpRequestWaitAndBlockUntilNoPending() {
91   if (dump_request_wait_handle_) {
92     // Wait for callbacks that might already be running to finish.
93     UnregisterWaitEx(dump_request_wait_handle_, INVALID_HANDLE_VALUE);
94     dump_request_wait_handle_ = NULL;
95   }
96 }
97 
UnregisterProcessExitWait(bool block_until_no_pending)98 void ClientInfo::UnregisterProcessExitWait(bool block_until_no_pending) {
99   if (process_exit_wait_handle_) {
100     if (block_until_no_pending) {
101       // Wait for the callback that might already be running to finish.
102       UnregisterWaitEx(process_exit_wait_handle_, INVALID_HANDLE_VALUE);
103     } else {
104       UnregisterWait(process_exit_wait_handle_);
105     }
106     process_exit_wait_handle_ = NULL;
107   }
108 }
109 
~ClientInfo()110 ClientInfo::~ClientInfo() {
111   // Waiting for the callback to finish here is safe because ClientInfo's are
112   // never destroyed from the dump request handling callback.
113   UnregisterDumpRequestWaitAndBlockUntilNoPending();
114 
115   // This is a little tricky because ClientInfo's may be destroyed by the same
116   // callback (OnClientEnd) and waiting for it to finish will cause a deadlock.
117   // Regardless of this complication, wait for any running callbacks to finish
118   // so that the common case is properly handled.  In order to avoid deadlocks,
119   // the OnClientEnd callback must call UnregisterProcessExitWait(false)
120   // before deleting the ClientInfo.
121   UnregisterProcessExitWait(true);
122 
123   if (process_handle_) {
124     CloseHandle(process_handle_);
125   }
126 
127   if (dump_requested_handle_) {
128     CloseHandle(dump_requested_handle_);
129   }
130 
131   if (dump_generated_handle_) {
132     CloseHandle(dump_generated_handle_);
133   }
134 }
135 
GetClientExceptionInfo(EXCEPTION_POINTERS ** ex_info) const136 bool ClientInfo::GetClientExceptionInfo(EXCEPTION_POINTERS** ex_info) const {
137   SIZE_T bytes_count = 0;
138   if (!ReadProcessMemory(process_handle_,
139                          ex_info_,
140                          ex_info,
141                          sizeof(*ex_info),
142                          &bytes_count)) {
143     return false;
144   }
145 
146   return bytes_count == sizeof(*ex_info);
147 }
148 
GetClientThreadId(DWORD * thread_id) const149 bool ClientInfo::GetClientThreadId(DWORD* thread_id) const {
150   SIZE_T bytes_count = 0;
151   if (!ReadProcessMemory(process_handle_,
152                          thread_id_,
153                          thread_id,
154                          sizeof(*thread_id),
155                          &bytes_count)) {
156     return false;
157   }
158 
159   return bytes_count == sizeof(*thread_id);
160 }
161 
SetProcessUptime()162 void ClientInfo::SetProcessUptime() {
163   FILETIME now = {0};
164   GetSystemTimeAsFileTime(&now);
165 
166   ULARGE_INTEGER time_start;
167   time_start.HighPart = start_time_.dwHighDateTime;
168   time_start.LowPart = start_time_.dwLowDateTime;
169 
170   ULARGE_INTEGER time_now;
171   time_now.HighPart = now.dwHighDateTime;
172   time_now.LowPart = now.dwLowDateTime;
173 
174   // Calculate the delay and convert it from 100-nanoseconds to milliseconds.
175   __int64 delay = (time_now.QuadPart - time_start.QuadPart) / 10 / 1000;
176 
177   // Convert it to a string.
178   wchar_t* value = custom_info_entries_.get()[custom_client_info_.count].value;
179   _i64tow_s(delay, value, CustomInfoEntry::kValueMaxLength, 10);
180 }
181 
PopulateCustomInfo()182 bool ClientInfo::PopulateCustomInfo() {
183   if (custom_client_info_.count > kMaxCustomInfoEntries)
184     return false;
185 
186   SIZE_T bytes_count = 0;
187   SIZE_T read_count = sizeof(CustomInfoEntry) * custom_client_info_.count;
188 
189   // If the scoped array for custom info already has an array, it will be
190   // the same size as what we need. This is because the number of custom info
191   // entries is always the same. So allocate memory only if scoped array has
192   // a NULL pointer.
193   if (!custom_info_entries_.get()) {
194     // Allocate an extra entry for reporting uptime for the client process.
195     custom_info_entries_.reset(
196         new CustomInfoEntry[custom_client_info_.count + 1]);
197     // Use the last element in the array for uptime.
198     custom_info_entries_.get()[custom_client_info_.count].set_name(
199         kCustomInfoProcessUptimeName);
200   }
201 
202   if (!ReadProcessMemory(process_handle_,
203                          custom_client_info_.entries,
204                          custom_info_entries_.get(),
205                          read_count,
206                          &bytes_count)) {
207     return false;
208   }
209 
210   SetProcessUptime();
211   return (bytes_count == read_count);
212 }
213 
GetCustomInfo() const214 CustomClientInfo ClientInfo::GetCustomInfo() const {
215   CustomClientInfo custom_info;
216   custom_info.entries = custom_info_entries_.get();
217   // Add 1 to the count from the client process to account for extra entry for
218   // process uptime.
219   custom_info.count = custom_client_info_.count + 1;
220   return custom_info;
221 }
222 
223 }  // namespace google_breakpad
224