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/*
* Copyright (C) 2014 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 "PruneList.h"
#include <ctype.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
bool Prune::Matches(LogBufferElement* element) const {
return (uid_ == UID_ALL || uid_ == element->uid()) &&
(pid_ == PID_ALL || pid_ == element->pid());
}
std::string Prune::Format() const {
if (uid_ != UID_ALL) {
if (pid_ != PID_ALL) {
return android::base::StringPrintf("%u/%u", uid_, pid_);
}
return android::base::StringPrintf("%u", uid_);
}
if (pid_ != PID_ALL) {
return android::base::StringPrintf("/%u", pid_);
}
// NB: pid_ == PID_ALL can not happen if uid_ == UID_ALL
return std::string("/");
}
PruneList::PruneList() {
Init(nullptr);
}
bool PruneList::Init(const char* str) {
high_priority_prune_.clear();
low_priority_prune_.clear();
// default here means take ro.logd.filter, persist.logd.filter then internal default in order.
if (str && !strcmp(str, "default")) {
str = nullptr;
}
if (str && !strcmp(str, "disable")) {
str = "";
}
std::string filter;
if (str) {
filter = str;
} else {
filter = android::base::GetProperty("ro.logd.filter", "default");
auto persist_filter = android::base::GetProperty("persist.logd.filter", "default");
// default here means take ro.logd.filter
if (persist_filter != "default") {
filter = persist_filter;
}
}
// default here means take internal default.
if (filter == "default") {
filter = "~! ~1000/!";
}
if (filter == "disable") {
filter = "";
}
worst_uid_enabled_ = false;
worst_pid_of_system_enabled_ = false;
for (str = filter.c_str(); *str; ++str) {
if (isspace(*str)) {
continue;
}
std::list<Prune>* list;
if (*str == '~' || *str == '!') { // ~ supported, ! undocumented
++str;
// special case, prune the worst UID of those using at least 1/8th of the buffer.
if (*str == '!') {
worst_uid_enabled_ = true;
++str;
if (!*str) {
break;
}
if (!isspace(*str)) {
LOG(ERROR) << "Nothing expected after '~!', but found '" << str << "'";
return false;
}
continue;
}
// special case, translated to worst PID of System at priority
static const char WORST_SYSTEM_PID[] = "1000/!";
if (!strncmp(str, WORST_SYSTEM_PID, sizeof(WORST_SYSTEM_PID) - 1)) {
worst_pid_of_system_enabled_ = true;
str += sizeof(WORST_SYSTEM_PID) - 1;
if (!*str) {
break;
}
if (!isspace(*str)) {
LOG(ERROR) << "Nothing expected after '~1000/!', but found '" << str << "'";
return false;
}
continue;
}
if (!*str) {
LOG(ERROR) << "Expected UID or PID after '~', but found nothing";
return false;
}
list = &high_priority_prune_;
} else {
list = &low_priority_prune_;
}
uid_t uid = Prune::UID_ALL;
if (isdigit(*str)) {
uid = 0;
do {
uid = uid * 10 + *str++ - '0';
} while (isdigit(*str));
}
pid_t pid = Prune::PID_ALL;
if (*str == '/') {
++str;
if (isdigit(*str)) {
pid = 0;
do {
pid = pid * 10 + *str++ - '0';
} while (isdigit(*str));
}
}
if (uid == Prune::UID_ALL && pid == Prune::PID_ALL) {
LOG(ERROR) << "Expected UID/PID combination, but found none";
return false;
}
if (*str && !isspace(*str)) {
LOG(ERROR) << "Nothing expected after UID/PID combination, but found '" << str << "'";
return false;
}
list->emplace_back(uid, pid);
if (!*str) {
break;
}
}
return true;
}
std::string PruneList::Format() const {
std::vector<std::string> prune_rules;
if (worst_uid_enabled_) {
prune_rules.emplace_back("~!");
}
if (worst_pid_of_system_enabled_) {
prune_rules.emplace_back("~1000/!");
}
for (const auto& rule : low_priority_prune_) {
prune_rules.emplace_back(rule.Format());
}
for (const auto& rule : high_priority_prune_) {
prune_rules.emplace_back("~" + rule.Format());
}
return android::base::Join(prune_rules, " ");
}
bool PruneList::IsHighPriority(LogBufferElement* element) const {
for (const auto& rule : high_priority_prune_) {
if (rule.Matches(element)) {
return true;
}
}
return false;
}
bool PruneList::IsLowPriority(LogBufferElement* element) const {
for (const auto& rule : low_priority_prune_) {
if (rule.Matches(element)) {
return true;
}
}
return false;
}
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