1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <android-base/logging.h>
18 #include <errno.h>
19 #include <log/log.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sys/inotify.h>
24 #include <unistd.h>
25 #include <fstream>
26
27 #include <cutils/properties.h>
28 #include <gflags/gflags.h>
29
30 #include "common/libs/fs/shared_fd.h"
31 #include "common/libs/utils/inotify.h"
32 #include "common/libs/utils/subprocess.h"
33
34 static const char TOMBSTONE_DIR[] = "/data/tombstones/";
35
36 // returns a fd which when read from, provides inotify events when tombstones
37 // are created
new_tombstone_create_notifier(void)38 static int new_tombstone_create_notifier(void) {
39 int file_create_notification_handle = inotify_init();
40 if (file_create_notification_handle == -1) {
41 ALOGE("%s: inotify_init failure error: '%s' (%d)", __FUNCTION__,
42 strerror(errno), errno);
43 return -1;
44 }
45
46 int watch_descriptor = inotify_add_watch(file_create_notification_handle,
47 TOMBSTONE_DIR, IN_CREATE);
48 if (watch_descriptor == -1) {
49 ALOGE("%s: Could not add watch for '%s', error: '%s' (%d)", __FUNCTION__,
50 TOMBSTONE_DIR, strerror(errno), errno);
51 close(file_create_notification_handle);
52 return -1;
53 }
54
55 return file_create_notification_handle;
56 }
57
58 DEFINE_uint32(port,
59 static_cast<uint32_t>(
60 property_get_int64("ro.boot.vsock_tombstone_port", 0)),
61 "VSOCK port to send tombstones to");
62 DEFINE_uint32(cid, 2, "VSOCK CID to send logcat output to");
63 DEFINE_bool(remove_tombstones_after_transmitting, false,
64 "Whether to remove the tombstone from VM after transmitting it");
65 #define TOMBSTONE_BUFFER_SIZE (1024)
66
tombstone_send_to_host(const std::string & ts_path)67 static void tombstone_send_to_host(const std::string& ts_path) {
68 auto log_fd =
69 cuttlefish::SharedFD::VsockClient(FLAGS_cid, FLAGS_port, SOCK_STREAM);
70 std::ifstream ifs(ts_path);
71 char buffer[TOMBSTONE_BUFFER_SIZE];
72 size_t num_transfers = 0;
73 size_t num_bytes_read = 0;
74 while (log_fd->IsOpen() && ifs.is_open() && !ifs.eof()) {
75 ifs.read(buffer, sizeof(buffer));
76 num_bytes_read += ifs.gcount();
77 log_fd->Write(buffer, ifs.gcount());
78 num_transfers++;
79 }
80
81 if (!log_fd->IsOpen()) {
82 auto error = log_fd->StrError();
83 ALOGE("Unable to connect to vsock:%u:%u: %s", FLAGS_cid, FLAGS_port,
84 error.c_str());
85 } else if (!ifs.is_open()) {
86 ALOGE("%s closed in the middle of readout.", ts_path.c_str());
87 } else {
88 LOG(INFO) << num_bytes_read << " bytes transferred from "
89 << ts_path.c_str() << " over " << num_transfers << " "
90 << TOMBSTONE_BUFFER_SIZE << " byte sized transfers";
91 }
92
93 if (FLAGS_remove_tombstones_after_transmitting) {
94 remove(ts_path.c_str());
95 }
96 }
97
main(int argc,char ** argv)98 int main(int argc, char** argv) {
99 gflags::ParseCommandLineFlags(&argc, &argv, true);
100
101 if(FLAGS_port == 0) {
102 LOG(FATAL_WITHOUT_ABORT) << "Port flag is required";
103 while(1) {sleep(1);};
104 }
105
106 int file_create_notification_handle = new_tombstone_create_notifier();
107 if (file_create_notification_handle == -1) {return -1;}
108
109 LOG(INFO) << "tombstone watcher successfully initialized";
110
111 #ifdef MICRODROID
112 property_set("tombstone_transmit.init_done", "true");
113 #endif
114
115 while (true) {
116 std::vector<std::string> ts_names =
117 cuttlefish::GetCreatedFileListFromInotifyFd(
118 file_create_notification_handle);
119 for (auto& ts_name : ts_names) {
120 tombstone_send_to_host(std::string(TOMBSTONE_DIR) + ts_name);
121 }
122 }
123
124 return 0;
125 }
126