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/*
* Copyright (C) 2016 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 "connection_sampler.h"
#include "utils/file_reader.h"
namespace profiler {
void ConnectionSampler::GetData(profiler::proto::NetworkProfilerData *data) {
int connection_number = 0;
for (const std::string &file_name : kConnectionFiles) {
connection_number += ReadConnectionNumber(kUid, file_name);
}
data->mutable_connection_data()->set_connection_number(connection_number);
}
int ConnectionSampler::ReadConnectionNumber(const std::string &uid,
const std::string &file) {
std::vector<std::string> lines;
FileReader::Read(file, &lines);
int result = 0;
for (const std::string &line : lines) {
if (!IsLocalInterface(line) &&
FileReader::CompareToken(line, uid, kUidTokenIndex)) {
result++;
}
}
return result;
}
bool ConnectionSampler::IsLocalInterface(const std::string &connection) {
std::string::const_iterator it = connection.begin();
// It's possible to have empty space in the beginning, for example, " 1:" has
// empty space and "100:" does not have empty space.
EatSpace(connection, &it);
bool match =
IsValidHeading(connection, &it) && EatSpace(connection, &it) &&
IsAllZerosIpAddress(connection, &it) && EatSpace(connection, &it) &&
IsAllZerosIpAddress(connection, &it) && EatSpace(connection, &it);
if (match) {
if ((connection.end() - it > 2) && (*it) == '0') {
it++;
return (*it) == 'A' || (*it) == 'a';
}
}
return false;
}
bool ConnectionSampler::IsValidHeading(const std::string &connection,
std::string::const_iterator *it) {
if (*it != connection.end() && isdigit(**it)) {
(*it)++;
while (*it != connection.end() && isdigit(**it)) {
(*it)++;
}
if (*it != connection.end() && **it == ':') {
(*it)++;
return true;
}
}
return false;
}
bool ConnectionSampler::IsAllZerosIpAddress(const std::string &connection,
std::string::const_iterator *it) {
if (*it != connection.end() && **it == '0') {
(*it)++;
while (*it != connection.end() && **it == '0') {
(*it)++;
}
if (*it != connection.end() && **it == ':') {
(*it)++;
int count = 0;
while ((*it != connection.end()) && (isdigit(**it) || isalpha(**it))) {
count++;
(*it)++;
}
return count == 4;
}
}
return false;
}
bool ConnectionSampler::EatSpace(const std::string &connection,
std::string::const_iterator *it) {
bool has_empty_space = false;
while (*it != connection.end() && isspace(**it)) {
(*it)++;
if (!has_empty_space) {
has_empty_space = true;
}
}
return has_empty_space;
}
} // namespace profiler
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