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/*
* Copyright (C) 2018 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 "perfetto/ext/tracing/ipc/default_socket.h"
#include "perfetto/base/build_config.h"
#include "perfetto/base/logging.h"
#include "perfetto/ext/base/utils.h"
#include "perfetto/ext/ipc/basic_types.h"
#include "perfetto/ext/tracing/core/basic_types.h"
#include <stdlib.h>
#if PERFETTO_BUILDFLAG(PERFETTO_OS_LINUX) || \
PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID) || \
PERFETTO_BUILDFLAG(PERFETTO_OS_APPLE)
#include <unistd.h>
#endif
namespace perfetto {
namespace {
const char* kRunPerfettoBaseDir = "/run/perfetto/";
// On Linux and CrOS, check /run/perfetto/ before using /tmp/ as the socket
// base directory.
bool UseRunPerfettoBaseDir() {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_LINUX)
// Note that the trailing / in |kRunPerfettoBaseDir| ensures we are checking
// against a directory, not a file.
int res = PERFETTO_EINTR(access(kRunPerfettoBaseDir, X_OK));
if (!res)
return true;
// If the path doesn't exist (ENOENT), fail silently to the caller. Otherwise,
// fail with an explicit error message.
if (errno != ENOENT
#if PERFETTO_BUILDFLAG(PERFETTO_CHROMIUM_BUILD)
// access(2) won't return EPERM, but Chromium sandbox returns EPERM if the
// sandbox doesn't allow the call (e.g. in the child processes).
&& errno != EPERM
#endif
) {
PERFETTO_PLOG("%s exists but cannot be accessed. Falling back on /tmp/ ",
kRunPerfettoBaseDir);
}
return false;
#else
base::ignore_result(kRunPerfettoBaseDir);
return false;
#endif
}
} // anonymous namespace
static_assert(kInvalidUid == ipc::kInvalidUid, "kInvalidUid mismatching");
const char* GetProducerSocket() {
const char* name = getenv("PERFETTO_PRODUCER_SOCK_NAME");
if (name == nullptr) {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
name = "127.0.0.1:32278";
#elif PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
name = "/dev/socket/traced_producer";
#else
// Use /run/perfetto if it exists. Then fallback to /tmp.
static const char* producer_socket =
UseRunPerfettoBaseDir() ? "/run/perfetto/traced-producer.sock"
: "/tmp/perfetto-producer";
name = producer_socket;
#endif
}
base::ignore_result(UseRunPerfettoBaseDir); // Silence unused func warnings.
return name;
}
const char* GetConsumerSocket() {
const char* name = getenv("PERFETTO_CONSUMER_SOCK_NAME");
if (name == nullptr) {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
name = "127.0.0.1:32279";
#elif PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
name = "/dev/socket/traced_consumer";
#else
// Use /run/perfetto if it exists. Then fallback to /tmp.
static const char* consumer_socket =
UseRunPerfettoBaseDir() ? "/run/perfetto/traced-consumer.sock"
: "/tmp/perfetto-consumer";
name = consumer_socket;
#endif
}
return name;
}
} // namespace perfetto
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