1 /*
2 *
3 * Copyright 2017, The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 #include "dropbox.h"
19
20 #include <cstdio>
21 #include <cstdlib>
22 #include <memory>
23
24 #include <inttypes.h>
25 #include <unistd.h>
26
27 #include <android-base/logging.h>
28 #include <android-base/stringprintf.h>
29 #include <android-base/unique_fd.h>
30 #include <android/os/DropBoxManager.h>
31 #include <binder/Status.h>
32 #include <utils/String8.h>
33
34 #include "perfprofd_record.pb.h"
35
36 #include "perfprofd_io.h"
37
38 namespace android {
39 namespace perfprofd {
40 namespace dropbox {
41
42 namespace {
43
WriteDropboxFile(android::perfprofd::PerfprofdRecord * encodedProfile,const std::string & temp_dir,std::string * error_msg)44 bool WriteDropboxFile(android::perfprofd::PerfprofdRecord* encodedProfile,
45 const std::string& temp_dir,
46 std::string* error_msg) {
47 android::base::unique_fd tmp_fd;
48 {
49 char path[PATH_MAX];
50 snprintf(path, sizeof(path), "%s/dropboxtmp-XXXXXX", temp_dir.c_str());
51 tmp_fd.reset(mkstemp(path));
52 if (tmp_fd.get() == -1) {
53 *error_msg = android::base::StringPrintf("Could not create temp file %s: %s",
54 path,
55 strerror(errno));
56 return false;
57 }
58 if (unlink(path) != 0) {
59 PLOG(WARNING) << "Could not unlink binder temp file";
60 }
61 }
62
63 // Dropbox takes ownership of the fd, and if it is not readonly,
64 // a selinux violation will occur. Get a read-only version.
65 android::base::unique_fd read_only;
66 {
67 char fdpath[64];
68 snprintf(fdpath, arraysize(fdpath), "/proc/self/fd/%d", tmp_fd.get());
69 read_only.reset(open(fdpath, O_RDONLY | O_CLOEXEC));
70 if (read_only.get() < 0) {
71 *error_msg = android::base::StringPrintf("Could not create read-only fd: %s",
72 strerror(errno));
73 return false;
74 }
75 }
76
77 constexpr bool kCompress = true; // Ignore the config here. Dropbox will always end up
78 // compressing the data, might as well make the temp
79 // file smaller and help it out.
80 using DropBoxManager = android::os::DropBoxManager;
81 constexpr int kDropboxFlags = DropBoxManager::IS_GZIPPED;
82
83 if (!SerializeProtobuf(encodedProfile, std::move(tmp_fd), kCompress)) {
84 *error_msg = "Could not serialize to temp file";
85 return false;
86 }
87
88 sp<DropBoxManager> dropbox(new DropBoxManager());
89 android::binder::Status status = dropbox->addFile(String16("perfprofd"),
90 read_only.release(),
91 kDropboxFlags);
92 if (!status.isOk()) {
93 *error_msg = status.toString8();
94 return false;
95 }
96 return true;
97 }
98
99 } // namespace
100
SendToDropbox(android::perfprofd::PerfprofdRecord * profile,const std::string & temp_directory,std::string * error_msg)101 bool SendToDropbox(android::perfprofd::PerfprofdRecord* profile,
102 const std::string& temp_directory,
103 std::string* error_msg) {
104 size_t size = profile->ByteSize();
105 if (size < 1024 * 1024) {
106 // For a small size, send as a byte buffer directly.
107 std::unique_ptr<uint8_t[]> data(new uint8_t[size]);
108 profile->SerializeWithCachedSizesToArray(data.get());
109
110 using DropBoxManager = android::os::DropBoxManager;
111 sp<DropBoxManager> dropbox(new DropBoxManager());
112 android::binder::Status status = dropbox->addData(String16("perfprofd"),
113 data.get(),
114 size,
115 0);
116 if (!status.isOk()) {
117 *error_msg = status.toString8();
118 return false;
119 }
120 return true;
121 } else {
122 // For larger buffers, we need to go through the filesystem.
123 return WriteDropboxFile(profile, temp_directory, error_msg);
124 }
125 }
126
127 } // namespace dropbox
128 } // namespace perfprofd
129 } // namespace android
130