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/*
* Copyright 2023, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "tombstoned/tombstoned.h"
#include <unistd.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/unique_fd.h>
#include <cutils/sockets.h>
#include <linux/vm_sockets.h>
#include "util.h"
using android::base::unique_fd;
/*
Port number that VirtualMachineService listens on connections from the guest VMs.
Kep in sync with IVirtualMachineService.aidl
*/
const unsigned int VM_TOMBSTONES_SERVICE_PORT = 2000;
static bool is_microdroid() {
return android::base::GetProperty("ro.hardware", "") == "microdroid";
}
static bool connect_tombstone_server_microdroid(unique_fd* text_output_fd,
unique_fd* proto_output_fd,
DebuggerdDumpType dump_type) {
// We do not wait for the property to be set, the default behaviour is not export tombstones.
if (!android::base::GetBoolProperty("microdroid_manager.export_tombstones.enabled", false)) {
LOG(WARNING) << "exporting tombstones is not enabled";
return false;
}
// Microdroid supports handling requests originating from crash_dump which
// supports limited dump types. Java traces and incept management are not supported.
switch (dump_type) {
case kDebuggerdNativeBacktrace:
case kDebuggerdTombstone:
case kDebuggerdTombstoneProto:
break;
default:
LOG(WARNING) << "Requested dump type: " << dump_type << " "
<< "not supported";
}
int fd1 = TEMP_FAILURE_RETRY(socket(AF_VSOCK, SOCK_STREAM, 0));
int fd2 = TEMP_FAILURE_RETRY(socket(AF_VSOCK, SOCK_STREAM, 0));
if (fd1 < 0 || fd2 < 0) {
LOG(WARNING) << "Unable to create virtual socket for writing tombstones";
return false;
}
unique_fd vsock_output_fd(fd1), vsock_proto_fd(fd2);
struct sockaddr_vm sa = (struct sockaddr_vm){
.svm_family = AF_VSOCK,
.svm_port = VM_TOMBSTONES_SERVICE_PORT,
.svm_cid = VMADDR_CID_HOST,
};
if (TEMP_FAILURE_RETRY(connect(vsock_output_fd, (struct sockaddr*)&sa, sizeof(sa))) < 0) {
PLOG(WARNING) << "Unable to connect to tombstone service in host";
return false;
}
if (dump_type == kDebuggerdTombstoneProto) {
if (TEMP_FAILURE_RETRY(connect(vsock_proto_fd, (struct sockaddr*)&sa, sizeof(sa))) < 0) {
PLOG(WARNING) << "Unable to connect to tombstone service in host";
return false;
}
}
*text_output_fd = std::move(vsock_output_fd);
if (proto_output_fd) {
*proto_output_fd = std::move(vsock_proto_fd);
}
return true;
}
static bool notify_completion_microdroid(int vsock_out, int vsock_proto) {
if (shutdown(vsock_out, SHUT_WR) || shutdown(vsock_proto, SHUT_WR)) return false;
return true;
}
bool connect_tombstone_server(pid_t pid, unique_fd* tombstoned_socket, unique_fd* text_output_fd,
unique_fd* proto_output_fd, DebuggerdDumpType dump_type) {
if (is_microdroid()) {
return connect_tombstone_server_microdroid(text_output_fd, proto_output_fd, dump_type);
}
return tombstoned_connect(pid, tombstoned_socket, text_output_fd, proto_output_fd, dump_type);
}
bool notify_completion(int tombstoned_socket, int vsock_out, int vsock_proto) {
if (is_microdroid()) {
return notify_completion_microdroid(vsock_out, vsock_proto);
}
return tombstoned_notify_completion(tombstoned_socket);
}
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