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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.
*/
#ifndef NETWORK_CONNECTION_SAMPLER_H
#define NETWORK_CONNECTION_SAMPLER_H
#include "network/network_sampler.h"
#include <string>
#include <vector>
namespace profiler {
// Data collector of open connection information. For example, it can
// collect the number of both tcp and udp open connections.
class ConnectionSampler final : public NetworkSampler {
public:
ConnectionSampler(const std::string &uid,
const std::vector<std::string> &files)
: kUid(uid), kConnectionFiles(files) {}
// Read system file to get the number of open connections, and store data in
// given {@code NetworkProfilerData}.
void GetData(profiler::proto::NetworkProfilerData *data) override;
private:
// Returns open connection number that is read from a given file.
int ReadConnectionNumber(const std::string &uid, const std::string &file);
// Returns whether the connection line is for local interface listening.
// In other words, both remote and local ip addresses are all zeros and the
// connection state is listening ('0A'). For example, here is a connection
// when the return value is TRUE: " 01: 00000000000000000000000000000000:13B4
// 00000000000000000000000000000000:0000 0A ...".
bool IsLocalInterface(const std::string &connection);
// Returns whether the next token starting at the current iterator position is
// a valid heading which is the same as regex "\s*[0-9]+:". The parameter
// iterator {@code it} is modified to be at the first char after heading. For
// example, here is a line returns TRUE: "01:".
bool IsValidHeading(const std::string &connection,
std::string::const_iterator *it);
// Returns whether the next token starting at the current iterator position is
// an ip address of all zeros, which is the same as regex "0+:[0-9A-Za-z]{4}".
// The parameter iterator {@code it} is modified to be at the first character
// after all zeros ip.
bool IsAllZerosIpAddress(const std::string &connection,
std::string::const_iterator *it);
// Returns whether the next token starting at the current iterator position is
// a empty space, and jump parameter {@code it} to the first character that is
// not empty space.
bool EatSpace(const std::string &connection, std::string::const_iterator *it);
// Index indicates the location of app uid(unique id), in the connection
// system files. One open connection is listed as a line in file. Tokens
// are joined by whitespace in a line. For example, a connection line is
// "01: 001:002:123 001:002:001 01 02 03 04 20555...".
// Index of Uid token "20555" is 7.
static const int kUidTokenIndex = 7;
// App uid for parsing file to get app information.
const std::string kUid;
// List of files containing open connection data; for example /proc/net/tcp6.
// Those files contain multiple apps' information.
const std::vector<std::string> kConnectionFiles;
};
} // namespace profiler
#endif // NETWORK_CONNECTION_SAMPLER_H
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