1 /*
2 * Copyright (C) 2021 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15 #include "event_log_catcher.h"
16
17 #include <string>
18
19 #include <climits>
20 #include <fcntl.h>
21 #include <sys/stat.h>
22 #include <sys/types.h>
23 #include <unistd.h>
24
25 #include "securec.h"
26
27 #include "common_utils.h"
28 #include "defines.h"
29 #include "file_util.h"
30 #include "logger.h"
31 namespace OHOS {
32 namespace HiviewDFX {
33 DEFINE_LOG_LABEL(0xD002D01, "EventLogger-EventLogCatcher");
34 namespace {
35 constexpr char SED_EXEC_PATH[] = "/system/bin/sed";
36 }
37
GetLogSize() const38 int EventLogCatcher::GetLogSize() const
39 {
40 return logSize_;
41 };
42
SetLogSize(int size)43 void EventLogCatcher::SetLogSize(int size)
44 {
45 logSize_ = size;
46 }
47
Initialize(const std::string & strParam1 __UNUSED,int intParam1 __UNUSED,int intParam2 __UNUSED)48 bool EventLogCatcher::Initialize(const std::string &strParam1 __UNUSED, int intParam1 __UNUSED, int intParam2 __UNUSED)
49 {
50 useStreamFilter_ = CommonUtils::IsSpecificCmdExist(SED_EXEC_PATH);
51 catcherStartTime_ = time(nullptr);
52 return true;
53 }
54
Catch(int fd __UNUSED)55 int EventLogCatcher::Catch(int fd __UNUSED)
56 {
57 return 0;
58 }
59
Stop()60 void EventLogCatcher::Stop()
61 {
62 needStop_ = true;
63 }
64
AppendFile(int fd,const std::string & fileName) const65 int EventLogCatcher::AppendFile(int fd, const std::string &fileName) const
66 {
67 char buf[BUF_SIZE_4096] = {0};
68
69 if (fd < 0) {
70 HIVIEW_LOGW("parameter err, fd:%{public}d, filename:%{public}s.", fd, fileName.c_str());
71 return 0;
72 }
73
74 char path[PATH_MAX] = {0};
75 if (realpath(fileName.c_str(), path) == nullptr) {
76 HIVIEW_LOGW("canonicalize failed.");
77 return 0;
78 }
79
80 if (fileName != std::string(path)) {
81 HIVIEW_LOGW("fail to check consistency.");
82 return 0;
83 }
84
85 int srcFd = open(path, O_RDONLY);
86 if (srcFd < 0) {
87 HIVIEW_LOGW("open %{public}s failed.", fileName.c_str());
88 return 0;
89 }
90
91 int wn = 0;
92 while (true) {
93 int rn = read(srcFd, buf, sizeof(buf));
94 if (rn == -1) {
95 if (errno == EAGAIN) {
96 continue;
97 } else {
98 break;
99 }
100 } else if (rn == 0) {
101 break;
102 }
103 wn += write(fd, buf, rn);
104 }
105 close(srcFd);
106 return wn;
107 }
108
GetDescription() const109 std::string EventLogCatcher::GetDescription() const
110 {
111 return description_;
112 }
113
GetFdSize(int32_t fd)114 int EventLogCatcher::GetFdSize(int32_t fd)
115 {
116 struct stat fileStat;
117 if (fstat(fd, &fileStat) == -1) {
118 return 0;
119 }
120 return fileStat.st_size;
121 }
122 } // namespace HiviewDFX
123 } // namespace OHOS
124