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/*
* Copyright (C) 2020 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 "snapuserd_daemon.h"
#include <android-base/logging.h>
#include <android-base/strings.h>
#include <gflags/gflags.h>
#include <libsnapshot/snapuserd_client.h>
#include "snapuserd_server.h"
DEFINE_string(socket, android::snapshot::kSnapuserdSocket, "Named socket or socket path.");
DEFINE_bool(no_socket, false,
"If true, no socket is used. Each additional argument is an INIT message.");
namespace android {
namespace snapshot {
bool Daemon::StartServer(int argc, char** argv) {
int arg_start = gflags::ParseCommandLineFlags(&argc, &argv, true);
if (!FLAGS_no_socket) {
return server_.Start(FLAGS_socket);
}
for (int i = arg_start; i < argc; i++) {
auto parts = android::base::Split(argv[i], ",");
if (parts.size() != 3) {
LOG(ERROR) << "Malformed message, expected three sub-arguments.";
return false;
}
auto handler = server_.AddHandler(parts[0], parts[1], parts[2]);
if (!handler || !server_.StartHandler(handler)) {
return false;
}
}
// Skip the accept() call to avoid spurious log spam. The server will still
// run until all handlers have completed.
server_.SetTerminating();
return true;
}
void Daemon::MaskAllSignalsExceptIntAndTerm() {
sigset_t signal_mask;
sigfillset(&signal_mask);
sigdelset(&signal_mask, SIGINT);
sigdelset(&signal_mask, SIGTERM);
sigdelset(&signal_mask, SIGPIPE);
if (sigprocmask(SIG_SETMASK, &signal_mask, NULL) != 0) {
PLOG(ERROR) << "Failed to set sigprocmask";
}
}
void Daemon::MaskAllSignals() {
sigset_t signal_mask;
sigfillset(&signal_mask);
if (sigprocmask(SIG_SETMASK, &signal_mask, NULL) != 0) {
PLOG(ERROR) << "Couldn't mask all signals";
}
}
void Daemon::Run() {
sigfillset(&signal_mask_);
sigdelset(&signal_mask_, SIGINT);
sigdelset(&signal_mask_, SIGTERM);
// Masking signals here ensure that after this point, we won't handle INT/TERM
// until after we call into ppoll()
signal(SIGINT, Daemon::SignalHandler);
signal(SIGTERM, Daemon::SignalHandler);
signal(SIGPIPE, Daemon::SignalHandler);
LOG(DEBUG) << "Snapuserd-server: ready to accept connections";
MaskAllSignalsExceptIntAndTerm();
server_.Run();
}
void Daemon::Interrupt() {
server_.Interrupt();
}
void Daemon::SignalHandler(int signal) {
LOG(DEBUG) << "Snapuserd received signal: " << signal;
switch (signal) {
case SIGINT:
case SIGTERM: {
Daemon::Instance().Interrupt();
break;
}
case SIGPIPE: {
LOG(ERROR) << "Received SIGPIPE signal";
break;
}
default:
LOG(ERROR) << "Received unknown signal " << signal;
break;
}
}
} // namespace snapshot
} // namespace android
int main(int argc, char** argv) {
android::base::InitLogging(argv, &android::base::KernelLogger);
android::snapshot::Daemon& daemon = android::snapshot::Daemon::Instance();
if (!daemon.StartServer(argc, argv)) {
LOG(ERROR) << "Snapuserd daemon failed to start.";
exit(EXIT_FAILURE);
}
daemon.Run();
return 0;
}
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