{"id":38268,"date":"2025-05-20T07:16:11","date_gmt":"2025-05-19T23:16:11","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/38268.html"},"modified":"2025-05-20T07:16:11","modified_gmt":"2025-05-19T23:16:11","slug":"linux-%e7%9a%84-udp-%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b-%e5%9b%9e%e6%98%be%e6%9c%8d%e5%8a%a1%e5%99%a8%ef%bc%8c%e7%bf%bb%e8%af%91%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/38268.html","title":{"rendered":"Linux \u7684 UDP \u7f51\u7edc\u7f16\u7a0b -- \u56de\u663e\u670d\u52a1\u5668\uff0c\u7ffb\u8bd1\u670d\u52a1\u5668"},"content":{"rendered":"

\u76ee\u5f55<\/p>\n

1. \u56de\u663e\u670d\u52a1\u5668 — echo server<\/p>\n

1.1 \u76f8\u5173\u51fd\u6570\u4ecb\u7ecd<\/p>\n

1.1.1 socket()<\/p>\n

1.1.2 bind()<\/p>\n

1.1.3 recvfrom()<\/p>\n

1.1.4 sendto()\u00a0<\/p>\n

1.1.5 inet_ntoa()<\/p>\n

1.1.6 inet_addr()<\/p>\n

1.2\u00a0Udp \u670d\u52a1\u7aef\u7684\u5c01\u88c5 — UdpServer.hpp<\/p>\n

1.3\u00a0\u670d\u52a1\u7aef\u4ee3\u7801 — UdpServer.cc<\/p>\n

1.4\u00a0\u5ba2\u6237\u7aef\u4ee3\u7801 — UdpClient.cc<\/p>\n

1.4.1 Linux\u7248\u672c\u7684\u5ba2\u6237\u7aef<\/p>\n

1.4.2 Windows \u7248\u672c\u7684\u5ba2\u6237\u7aef<\/p>\n

1.5 demo \u6f14\u793a<\/p>\n

1.6 \u7f51\u7edc\u76f8\u5173\u547d\u4ee4<\/p>\n

2. \u7ffb\u8bd1\u670d\u52a1\u5668 — Translation server<\/p>\n

2.1 Udp \u670d\u52a1\u7aef\u5c01\u88c5 — UdpServer.hpp<\/p>\n

2.2 \u5b57\u5178\u7ed3\u6784\u4f53\u7684\u5c01\u88c5 — Dict.hpp<\/p>\n

2.3 \u7f51\u7edc\u5730\u5740\u8f6c\u4e3b\u673a\u5730\u5740\u7684\u5c01\u88c5 — InetAddr.hpp<\/p>\n

2.4\u00a0Udp \u670d\u52a1\u7aef — UdpServer.cc<\/p>\n

2.5\u00a0Udp \u5ba2\u6237\u7aef — UdpClient.cc<\/p>\n

\n

1. \u56de\u663e\u670d\u52a1\u5668 — echo server<\/h2>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4f7f\u7528C++\u5b9e\u73b0\u4e00\u4e2a\u56de\u663e\u670d\u52a1\u5668，\u8be5\u4ee3\u7801\u7684\u4f5c\u7528\u662f\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u7aef\u53d1\u9001\u6d88\u606f，\u7136\u540e\u56de\u663e\u5230\u5ba2\u6237\u7aef\u7684\u663e\u793a\u5668\u4e0a\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5148\u7ed9\u51fa\u9700\u8981\u4f7f\u7528\u7684\u4e92\u65a5\u9501\u7684\u5c01\u88c5\u6a21\u5757\u548c\u7ebf\u7a0b\u5b89\u5168\u7684\u65e5\u5fd7\u6a21\u5757\u3002<\/p>\n

\/\/ Mutex.hpp<\/p>\n

#pragma once
\n#include <pthread.h><\/p>\n

\/\/ \u5c06\u4e92\u65a5\u91cf\u63a5\u53e3\u5c01\u88c5\u6210\u9762\u5411\u5bf9\u8c61\u7684\u5f62\u5f0f
\nnamespace MutexModule
\n{
\n class Mutex
\n {
\n public:
\n Mutex()
\n {
\n int n = pthread_mutex_init(&_mutex, nullptr);
\n (void)n;
\n }
\n ~Mutex()
\n {
\n int n = pthread_mutex_destroy(&_mutex);
\n (void)n;
\n }<\/p>\n

void Lock()
\n {
\n int n = pthread_mutex_lock(&_mutex);
\n (void)n;
\n }<\/p>\n

void Unlock()
\n {
\n int n = pthread_mutex_unlock(&_mutex);
\n (void)n;
\n }<\/p>\n

pthread_mutex_t* Get() \/\/ \u83b7\u53d6\u539f\u751f\u4e92\u65a5\u91cf\u7684\u6307\u9488
\n {
\n return &_mutex;
\n }
\n private:
\n pthread_mutex_t _mutex;
\n };<\/p>\n

\/\/ \u91c7\u7528RAII\u98ce\u683c\u8fdb\u884c\u9501\u7ba1\u7406，\u5f53\u5c40\u90e8\u4e34\u754c\u533a\u4ee3\u7801\u8fd0\u884c\u5b8c\u7684\u65f6\u5019，\u5c40\u90e8LockGuard\u7c7b\u578b\u7684\u5bf9\u8c61\u81ea\u52a8\u8fdb\u884c\u91ca\u653e，\u8c03\u7528\u6790\u6784\u51fd\u6570\u91ca\u653e\u9501
\n class LockGuard
\n {
\n public:
\n LockGuard(Mutex &mutex)
\n : _mutex(mutex)
\n {
\n _mutex.Lock();
\n }<\/p>\n

~LockGuard()
\n {
\n _mutex.Unlock();
\n }
\n private:
\n Mutex& _mutex;
\n };
\n}
\n\/\/ Log.hpp<\/p>\n

#ifndef __LOG_HPP__
\n#define __LOG_HPP__<\/p>\n

#include <iostream>
\n#include <cstdio>
\n#include <string>
\n#include <filesystem> \/\/C++17
\n#include <sstream>
\n#include <fstream>
\n#include <ctime>
\n#include <memory>
\n#include <unistd.h>
\n#include "Mutex.hpp"<\/p>\n

namespace LogModule
\n{
\n using namespace MutexModule;<\/p>\n

const std::string gsep = "\\\\r\\\\n";
\n \/\/ \u7b56\u7565\u6a21\u5f0f — \u5229\u7528C++\u7684\u591a\u6001\u7279\u6027
\n \/\/ 1. \u5237\u65b0\u7b56\u7565 a: \u5411\u663e\u793a\u5668\u6253\u5370 b: \u5411\u6587\u4ef6\u4e2d\u5199\u5165
\n \/\/ \u5237\u65b0\u7b56\u7565\u57fa\u7c7b
\n class LogStrategy
\n {
\n public:
\n virtual ~LogStrategy() = default;
\n virtual void SyncLog(const std::string &message) = 0;
\n };<\/p>\n

\/\/ \u663e\u793a\u5668\u6253\u5370\u65e5\u5fd7\u7684\u7b56\u7565
\n class ConsoleLogStrategy : public LogStrategy
\n {
\n public:
\n ConsoleLogStrategy()
\n {
\n }<\/p>\n

void SyncLog(const std::string &message) override
\n {
\n \/\/ \u52a0\u9501\u4f7f\u591a\u7ebf\u7a0b\u539f\u5b50\u6027\u7684\u8bbf\u95ee\u663e\u793a\u5668
\n LockGuard lockGuard(_mutex);
\n std::cout << message << gsep;
\n }<\/p>\n

~ConsoleLogStrategy()
\n {
\n }<\/p>\n

private:
\n Mutex _mutex;
\n };<\/p>\n

\/\/ \u6587\u4ef6\u6253\u5370\u65e5\u5fd7\u7b56\u7565
\n \/\/ \u9ed8\u8ba4\u7684\u65e5\u5fd7\u6587\u4ef6\u8def\u5f84\u548c\u65e5\u5fd7\u6587\u4ef6\u540d
\n const std::string defaultPath = ".\/log";
\n const std::string defaultFile = "my.log";
\n class FileLogStrategy : public LogStrategy
\n {
\n public:
\n FileLogStrategy(const std::string &path = defaultPath, const std::string &file = defaultFile)
\n : _path(path),
\n _file(file)
\n {
\n \/\/ \u52a0\u9501\u4f7f\u591a\u7ebf\u7a0b\u539f\u5b50\u6027\u7684\u8bbf\u95ee\u6587\u4ef6
\n LockGuard lockGuard(_mutex);
\n \/\/ \u5224\u65ad\u76ee\u5f55\u662f\u5426\u5b58\u5728
\n if (std::filesystem::exists(_path)) \/\/ \u68c0\u6d4b\u6587\u4ef6\u7cfb\u7edf\u5bf9\u8c61（\u6587\u4ef6，\u76ee\u5f55，\u7b26\u53f7\u94fe\u63a5\u7b49）\u662f\u5426\u5b58\u5728
\n {
\n return;
\n }
\n try
\n {
\n \/\/ \u5982\u679c\u76ee\u5f55\u4e0d\u5b58\u5728，\u9012\u5f52\u521b\u5efa\u76ee\u5f55
\n std::filesystem::create_directories(_path);
\n }
\n catch (const std::filesystem::filesystem_error &e) \/\/ \u5982\u679c\u521b\u5efa\u5931\u8d25\u5219\u6253\u5370\u5f02\u5e38\u4fe1\u606f
\n {
\n std::cerr << e.what() << '\\\\n';
\n }
\n }<\/p>\n

void SyncLog(const std::string &message) override
\n {
\n LockGuard lockGuard(_mutex);
\n \/\/ \u8ffd\u52a0\u65b9\u5f0f\u5411\u6587\u4ef6\u4e2d\u5199\u5165
\n std::string fileName = _path + (_path.back() == '\/' ? "" : "\/") + _file;
\n \/\/ std::ofstream\u662fC++\u6807\u51c6\u5e93\u4e2d\u7528\u4e8e\u8f93\u51fa\u5230\u6587\u4ef6\u7684\u6d41\u7c7b，\u4e3b\u8981\u7528\u4e8e\u5c06\u6570\u636e\u5199\u5165\u6587\u4ef6
\n std::ofstream out(fileName, std::ios::app);
\n if (!out.is_open())
\n {
\n return;
\n }
\n out << message << gsep;
\n out.close();
\n }<\/p>\n

~FileLogStrategy()
\n {
\n }<\/p>\n

private:
\n std::string _path; \/\/ \u65e5\u5fd7\u6587\u4ef6\u6240\u5728\u8def\u5f84
\n std::string _file; \/\/ \u65e5\u5fd7\u6587\u4ef6\u672c\u8eab
\n Mutex _mutex;
\n };<\/p>\n

\/\/ 2. \u5f62\u6210\u5b8c\u6574\u65e5\u5fd7\u5e76\u5237\u65b0\u5230\u6307\u5b9a\u4f4d\u7f6e
\n \/\/ 2.1 \u65e5\u5fd7\u7b49\u7ea7
\n enum class LogLevel
\n {
\n DEBUG,
\n INFO,
\n WARNING,
\n ERROR,
\n FATAL
\n };<\/p>\n

\/\/ 2.2 \u679a\u4e3e\u7c7b\u578b\u7684\u65e5\u5fd7\u7b49\u7ea7\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u7c7b\u578b
\n std::string Level2Str(LogLevel level)
\n {
\n switch (level)
\n {
\n case LogLevel::DEBUG:
\n return "DEBUG";
\n case LogLevel::INFO:
\n return "INFO";
\n case LogLevel::WARNING:
\n return "WARNING";
\n case LogLevel::ERROR:
\n return "ERROR";
\n case LogLevel::FATAL:
\n return "FATAL";
\n default:
\n return "UNKNOWN";
\n }
\n }<\/p>\n

\/\/ 2.3 \u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u7684\u51fd\u6570
\n std::string GetCurTime()
\n {
\n \/\/ time \u51fd\u6570\u53c2\u6570\u4e3a\u4e00\u4e2atime_t\u7c7b\u578b\u7684\u6307\u9488，\u82e5\u8be5\u6307\u9488\u4e0d\u4e3aNULL，\u4f1a\u628a\u83b7\u53d6\u5230\u7684\u5f53\u524d\u65f6\u95f4\u503c\u5b58\u50a8\u5728\u6307\u9488\u6307\u5411\u7684\u5bf9\u8c61\u4e2d
\n \/\/ \u82e5\u4f20\u5165\u4e3aNULL，\u5219\u4ec5\u8fd4\u56de\u5f53\u524d\u65f6\u95f4，\u8fd4\u56de\u4ece1970\u5e741\u67081\u65e50\u70b9\u5230\u76ee\u524d\u7684\u79d2\u6570
\n time_t cur = time(nullptr);
\n struct tm curTm;
\n \/\/ localtime_r\u662flocaltime\u7684\u53ef\u91cd\u5165\u7248\u672c，\u4e3b\u8981\u7528\u4e8e\u5c06time_t\u7c7b\u578b\u8868\u793a\u7684\u65f6\u95f4\u8f6c\u6362\u4e3a\u672c\u5730\u65f6\u95f4，\u5b58\u50a8\u5728struct tm \u7ed3\u6784\u4f53\u4e2d
\n localtime_r(&cur, &curTm);
\n char timeBuffer[128];
\n snprintf(timeBuffer, sizeof(timeBuffer), "%4d-%02d-%02d %02d:%02d:%02d",
\n curTm.tm_year + 1900,
\n curTm.tm_mon + 1,
\n curTm.tm_mday,
\n curTm.tm_hour,
\n curTm.tm_min,
\n curTm.tm_sec);
\n return timeBuffer;
\n }<\/p>\n

\/\/ 2.4 \u65e5\u5fd7\u5f62\u6210\u5e76\u5237\u65b0
\n class Logger
\n {
\n public:
\n \/\/ \u9ed8\u8ba4\u5237\u65b0\u5230\u663e\u793a\u5668\u4e0a
\n Logger()
\n {
\n EnableConsoleLogStrategy();
\n }<\/p>\n

void EnableConsoleLogStrategy()
\n {
\n \/\/ std::make_unique\u7528\u4e8e\u521b\u5efa\u5e76\u8fd4\u56de\u4e00\u4e2astd::unique_ptr\u5bf9\u8c61
\n _fflushStrategy = std::make_unique<ConsoleLogStrategy>();
\n }<\/p>\n

void EnableFileLogStrategy()
\n {
\n _fflushStrategy = std::make_unique<FileLogStrategy>();
\n }
\n \/\/ \u5185\u90e8\u7c7b\u9ed8\u8ba4\u662f\u5916\u90e8\u7c7b\u7684\u53cb\u5143\u7c7b，\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u7c7b\u7684\u79c1\u6709\u6210\u5458\u53d8\u91cf
\n \/\/ \u5185\u90e8\u7c7bLogMessage，\u8868\u793a\u4e00\u6761\u65e5\u5fd7\u4fe1\u606f\u7684\u7c7b
\n class LogMessage
\n {
\n public:
\n LogMessage(LogLevel &level, std::string &srcName, int lineNum, Logger &logger)
\n : _curTime(GetCurTime()),
\n _level(level),
\n _pid(getpid()),
\n _srcName(srcName),
\n _lineNum(lineNum),
\n _logger(logger)
\n {
\n \/\/ \u65e5\u5fd7\u7684\u57fa\u672c\u4fe1\u606f\u5408\u5e76\u8d77\u6765
\n \/\/ std::stringstream\u7528\u4e8e\u5728\u5185\u5b58\u4e2d\u8fdb\u884c\u5b57\u7b26\u4e32\u7684\u8f93\u5165\u8f93\u51fa\u64cd\u4f5c, \u63d0\u4f9b\u4e00\u79cd\u65b9\u4fbf\u7684\u65b9\u5f0f\u5904\u7406\u5b57\u7b26\u4e32
\n \/\/ \u5c06\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32，\u4e5f\u53ef\u4ee5\u5c06\u5b57\u7b26\u4e32\u89e3\u6790\u4e3a\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e
\n std::stringstream ss;
\n ss << "[" << _curTime << "] "
\n << "[" << Level2Str(_level) << "] "
\n << "[" << _pid << "] "
\n << "[" << _srcName << "] "
\n << "[" << _lineNum << "] "
\n << "- ";<\/p>\n

_logInfo = ss.str();
\n }<\/p>\n

\/\/ \u4f7f\u7528\u6a21\u677f\u91cd\u8f7d\u8fd0\u7b97\u7b26<< — \u652f\u6301\u4e0d\u540c\u6570\u636e\u7c7b\u578b\u7684\u8f93\u51fa\u8fd0\u7b97\u7b26\u91cd\u8f7d
\n template <typename T>
\n LogMessage &operator<<(const T &info)
\n {
\n std::stringstream ss;
\n ss << info;
\n _logInfo += ss.str();
\n return *this;
\n }<\/p>\n

~LogMessage()
\n {
\n if (_logger._fflushStrategy)
\n {
\n _logger._fflushStrategy->SyncLog(_logInfo);
\n }
\n }<\/p>\n

private:
\n std::string _curTime; \/\/ \u65e5\u5fd7\u65f6\u95f4
\n LogLevel _level; \/\/ \u65e5\u5fd7\u7b49\u7ea7
\n pid_t _pid; \/\/ \u8fdb\u7a0bpid
\n std::string _srcName; \/\/ \u8f93\u51fa\u65e5\u5fd7\u7684\u6587\u4ef6\u540d
\n int _lineNum; \/\/\u8f93\u51fa\u65e5\u5fd7\u7684\u884c\u53f7
\n std::string _logInfo; \/\/\u5b8c\u6574\u65e5\u5fd7\u5185\u5bb9
\n Logger &_logger; \/\/ \u65b9\u4fbf\u4f7f\u7528\u7b56\u7565\u8fdb\u884c\u5237\u65b0
\n };<\/p>\n

\/\/ \u4f7f\u7528\u5b8f\u8fdb\u884c\u66ff\u6362\u4e4b\u540e\u8c03\u7528\u7684\u5f62\u5f0f\u5982\u4e0b
\n \/\/ logger(level, __FILE__, __LINE__) << "hello world" << 3.14;
\n \/\/ \u8fd9\u91cc\u4f7f\u7528\u4eff\u51fd\u6570\u7684\u5f62\u5f0f，\u8c03\u7528LogMessage\u7684\u6784\u9020\u51fd\u6570，\u6784\u9020\u4e00\u4e2a\u533f\u540d\u7684LogMessage\u5bf9\u8c61
\n \/\/ \u8fd4\u56de\u7684LogMessage\u5bf9\u8c61\u662f\u4e00\u4e2a\u4e34\u65f6\u5bf9\u8c61，\u5b83\u7684\u751f\u547d\u5468\u671f\u4ece\u521b\u5efa\u5f00\u59cb\u5230\u5305\u542b\u5b83\u7684\u5b8c\u6574\u8868\u8fbe\u5f0f\u7ed3\u675f(\u53ef\u4ee5\u7b80\u5355\u7406\u89e3\u4e3a\u5305\u542b
\n \/\/ \u8fd9\u4e2a\u5bf9\u8c61\u7684\u8be5\u884c\u4ee3\u7801)
\n \/\/ \u4ee3\u7801\u8c03\u7528\u7ed3\u675f\u7684\u65f6\u5019，\u5982\u679c\u6ca1\u6709LogMessage\u5bf9\u8c61\u8fdb\u884c\u4e34\u65f6\u5bf9\u8c61\u7684\u63a5\u6536，\u5219\u4f1a\u8c03\u7528\u6790\u6784\u51fd\u6570,
\n \/\/ \u5982\u679c\u6709LogMessage\u5bf9\u8c61\u8fdb\u884c\u4e34\u65f6\u5bf9\u8c61\u7684\u63a5\u6536，\u4f1a\u8c03\u7528\u62f7\u8d1d\u6784\u9020\u6216\u8005\u79fb\u52a8\u6784\u9020\u6784\u9020\u4e00\u4e2a\u5bf9\u8c61，\u5e76\u6790\u6784\u4e34\u65f6\u5bf9\u8c61
\n \/\/ \u6240\u4ee5\u901a\u8fc7\u4e34\u65f6\u53d8\u91cf\u8c03\u7528\u6790\u6784\u51fd\u6570\u8fdb\u884c\u65e5\u5fd7\u7684\u6253\u5370
\n LogMessage operator()(LogLevel level, std::string name, int line)
\n {
\n return LogMessage(level, name, line, *this);
\n }<\/p>\n

~Logger()
\n {
\n }<\/p>\n

private:
\n std::unique_ptr<LogStrategy> _fflushStrategy;
\n };<\/p>\n

\/\/ \u5b9a\u4e49\u4e00\u4e2a\u5168\u5c40\u7684Logger\u5bf9\u8c61
\n Logger logger;<\/p>\n

\/\/ \u4f7f\u7528\u5b8f\u5b9a\u4e49，\u7b80\u5316\u7528\u6237\u64cd\u4f5c\u5e76\u4e14\u83b7\u53d6\u6587\u4ef6\u540d\u548c\u884c\u53f7
\n #define LOG(level) logger(level, __FILE__, __LINE__) \/\/ \u4f7f\u7528\u4eff\u51fd\u6570\u7684\u65b9\u5f0f\u8fdb\u884c\u8c03\u7528
\n #define Enable_Console_Log_Strategy() logger.EnableConsoleLogStrategy()
\n #define Enable_File_Log_Strategy() logger.EnableFileLogStrategy()
\n}<\/p>\n

#endif <\/p>\n

1.1 \u76f8\u5173\u51fd\u6570\u4ecb\u7ecd<\/h3>\n

1.1.1 socket()<\/h4>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u7f51\u7edc\u7f16\u7a0b\u9886\u57df，socket\u00a0\u662f\u4e00\u4e2a\u57fa\u7840\u4e14\u5173\u952e\u7684\u51fd\u6570，\u4e3b\u8981\u7528\u4e8e\u521b\u5efa\u7f51\u7edc\u901a\u4fe1\u7684\u7aef\u70b9，\u4e5f\u5c31\u662f \u201c\u5957\u63a5\u5b57\u201d\u3002<\/p>\n

\u539f\u578b：
\n int socket(int domain, int type, int protocol);<\/p>\n

\u5934\u6587\u4ef6：
\n #include <sys\/types.h>
\n #include <sys\/socket.h><\/p>\n

\u53c2\u6570：
\n domain（\u534f\u8bae\u65cf）：\u6b64\u53c2\u6570\u7528\u4e8e\u786e\u5b9a\u7f51\u7edc\u901a\u4fe1\u6240\u4f7f\u7528\u7684\u534f\u8bae\u6808，\u5e38\u89c1\u7684\u53d6\u503c\u6709：AF_INET：\u4ee3\u8868 IPv4 \u534f
\n\u8bae，AF_INET6：\u8868\u793a IPv6 \u534f\u8bae，AF_UNIX：\u7528\u4e8e\u672c\u5730\u901a\u4fe1\u7684 Unix \u57df\u5957\u63a5\u5b57\u3002<\/p>\n

type（\u5957\u63a5\u5b57\u7c7b\u578b）：\u8be5\u53c2\u6570\u51b3\u5b9a\u4e86\u901a\u4fe1\u7684\u7279\u6027，\u5e38\u7528\u7684\u7c7b\u578b\u6709：SOCK_STREAM：\u63d0\u4f9b\u9762\u5411\u8fde\u63a5\u7684\u3001\u53ef\u9760
\n\u7684\u6570\u636e\u6d41\u670d\u52a1，TCP \u534f\u8bae\u5c31\u5c5e\u4e8e\u8fd9\u79cd\u7c7b\u578b\u3002SOCK_DGRAM：\u5b9e\u73b0\u65e0\u8fde\u63a5\u7684\u3001\u4e0d\u53ef\u9760\u7684\u6570\u636e\u62a5\u670d\u52a1，UDP \u534f\u8bae\u662f\u5176
\n\u5178\u578b\u4ee3\u8868\u3002SOCK_RAW：\u5141\u8bb8\u76f4\u63a5\u8bbf\u95ee\u5e95\u5c42\u534f\u8bae，\u53ef\u7528\u4e8e\u81ea\u5b9a\u4e49\u534f\u8bae\u7684\u5f00\u53d1\u3002<\/p>\n

protocol（\u534f\u8bae）：\u5f53\u5957\u63a5\u5b57\u7c7b\u578b\u4e0d\u80fd\u552f\u4e00\u786e\u5b9a\u4f7f\u7528\u7684\u534f\u8bae\u65f6，\u5c31\u9700\u8981\u901a\u8fc7\u8fd9\u4e2a\u53c2\u6570\u6765\u660e\u786e\u6307\u5b9a\u3002\u4e00\u822c\u60c5
\n\u51b5\u4e0b，\u5c06\u5176\u8bbe\u7f6e\u4e3a 0 \u5373\u53ef，\u7cfb\u7edf\u4f1a\u81ea\u52a8\u9009\u62e9\u5408\u9002\u7684\u534f\u8bae\u3002\u5bf9\u4e8e SOCK_STREAM \u7c7b\u578b，\u7cfb\u7edf\u901a\u5e38\u4f1a\u9009\u62e9 TCP \u534f
\n\u8bae\u3002\u5bf9\u4e8e SOCK_DGRAM \u7c7b\u578b，\u7cfb\u7edf\u4e00\u822c\u4f1a\u9009\u62e9 UDP \u534f\u8bae\u3002<\/p>\n

\u8fd4\u56de\u503c：
\n \u6210\u529f，\u8fd4\u56de\u4e00\u4e2a\u975e\u8d1f\u6574\u6570，\u5373\u8c03\u8282\u5b50\u63cf\u8ff0\u7b26，\u7c7b\u4f3c\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002
\n \u5931\u8d25，\u8fd4\u56de-1，\u5e76\u8bbe\u7f6eerrno\u6765\u6307\u793a\u5177\u4f53\u7684\u9519\u8bef\u539f\u56e0\u3002<\/p>\n

\u529f\u80fd：
\n \u521b\u5efa\u7f51\u7edc\u901a\u4fe1\u7684\u5957\u63a5\u5b57 <\/p>\n

1.1.2 bind()<\/h4>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u7f51\u7edc\u7f16\u7a0b\u4e2d，bind()\u00a0\u51fd\u6570\u662f\u4e00\u4e2a\u5173\u952e\u7684\u7cfb\u7edf\u8c03\u7528，\u4e3b\u8981\u7528\u4e8e\u5c06\u4e00\u4e2a\u5957\u63a5\u5b57（\u901a\u8fc7\u00a0socket()\u00a0\u51fd\u6570\u521b\u5efa）\u4e0e\u7279\u5b9a\u7684\u7f51\u7edc\u5730\u5740\u548c\u7aef\u53e3\u53f7\u8fdb\u884c\u7ed1\u5b9a\u3002<\/p>\n

\u539f\u578b：
\n int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen);<\/p>\n

\u5934\u6587\u4ef6：
\n #include <sys\/types.h>
\n #include <sys\/socket.h><\/p>\n

\u53c2\u6570：
\n sockfd：\u8fd9\u662f\u901a\u8fc7 socket() \u51fd\u6570\u8fd4\u56de\u7684\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26，\u5b83\u6807\u8bc6\u4e86\u8981\u8fdb\u884c\u7ed1\u5b9a\u64cd\u4f5c\u7684\u5957\u63a5\u5b57\u3002<\/p>\n

addr：\u8fd9\u662f\u4e00\u4e2a\u6307\u5411 struct sockaddr \u7c7b\u578b\u7684\u6307\u9488，\u5176\u4e2d\u5305\u542b\u4e86\u8981\u7ed1\u5b9a\u7684\u5730\u5740\u548c\u7aef\u53e3\u4fe1\u606f\u3002\u4e0d\u8fc7，
\n\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d，\u901a\u5e38\u4f1a\u4f7f\u7528\u7279\u5b9a\u534f\u8bae\u7684\u5730\u5740\u7ed3\u6784，\u6bd4\u5982 struct sockaddr_in（\u7528\u4e8e IPv4）\u6216 struct
\nsockaddr_in6（\u7528\u4e8e IPv6），\u7136\u540e\u518d\u5c06\u5176\u5f3a\u5236\u8f6c\u6362\u4e3a struct sockaddr \u7c7b\u578b\u3002<\/p>\n

addrlen：\u8be5\u53c2\u6570\u8868\u793a addr \u7ed3\u6784\u7684\u957f\u5ea6，\u5176\u7c7b\u578b\u4e3a socklen_t<\/p>\n

\u8fd4\u56de\u503c：
\n \u6210\u529f，\u8fd4\u56de0.
\n \u5931\u8d25，\u8fd4\u56de-1，\u5e76\u8bbe\u7f6e errno \u6765\u6307\u793a\u5177\u4f53\u7684\u9519\u8bef\u539f\u56e0\u3002<\/p>\n

\u529f\u80fd：
\n \u7528\u4e8e\u5c06\u4e00\u4e2a\u5957\u63a5\u5b57（\u901a\u8fc7 socket() \u51fd\u6570\u521b\u5efa）\u4e0e\u7279\u5b9a\u7684\u7f51\u7edc\u5730\u5740\u548c\u7aef\u53e3\u53f7\u8fdb\u884c\u7ed1\u5b9a\u3002 <\/p>\n

1.1.3 recvfrom()<\/h4>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u7f51\u7edc\u7f16\u7a0b\u91cc，recvfrom\u00a0\u51fd\u6570\u4e3b\u8981\u7528\u4e8e\u4ece UDP \u5957\u63a5\u5b57\u63a5\u6536\u6570\u636e\u5e76\u83b7\u53d6\u53d1\u9001\u65b9\u7684\u5957\u63a5\u5b57\u4fe1\u606f\u3002<\/p>\n

\u539f\u578b：
\n ssize_t recvfrom(int sockfd, void *buf, size_t len, int flags, struct sockaddr *src_addr, socklen_t *addrlen);<\/p>\n

\u5934\u6587\u4ef6：
\n #include <sys\/types.h>
\n #include <sys\/socket.h><\/p>\n

\u53c2\u6570：
\n sockfd：\u8fd9\u662f\u901a\u8fc7 socket() \u51fd\u6570\u8fd4\u56de\u7684\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26，\u5b83\u6807\u8bc6\u4e86\u8981\u63a5\u6536\u6570\u636e\u7684\u5957\u63a5\u5b57\u3002<\/p>\n

buf：\u8fd9\u662f\u4e00\u4e2a\u6307\u5411\u7f13\u51b2\u533a\u7684\u6307\u9488，\u7528\u4e8e\u5b58\u50a8\u63a5\u6536\u5230\u7684\u6570\u636e\u3002<\/p>\n

len：\u8868\u793a\u7f13\u51b2\u533a buf \u7684\u6700\u5927\u957f\u5ea6，\u5373\u6700\u591a\u53ef\u4ee5\u63a5\u6536\u7684\u5b57\u8282\u6570\u3002<\/p>\n

flags：\u8fd9\u662f\u4e00\u4e2a\u53ef\u9009\u7684\u6807\u5fd7\u53c2\u6570，\u901a\u5e38\u8bbe\u7f6e\u4e3a 0\u3002\u5e38\u89c1\u7684\u6807\u5fd7\u9009\u9879\u6709：MSG_DONTWAIT：\u5c06\u64cd\u4f5c\u8bbe\u7f6e\u4e3a\u975e
\n\u963b\u585e\u6a21\u5f0f\u3002MSG_PEEK：\u67e5\u770b\u6570\u636e\u4f46\u4e0d\u5c06\u5176\u4ece\u63a5\u6536\u961f\u5217\u4e2d\u79fb\u9664\u3002<\/p>\n

src_addr：\u8fd9\u662f\u4e00\u4e2a\u6307\u5411 struct sockaddr \u7c7b\u578b\u7684\u6307\u9488，\u7528\u4e8e\u5b58\u50a8\u53d1\u9001\u65b9\u7684\u5730\u5740\u4fe1\u606f\u3002<\/p>\n

addrlen：\u8fd9\u662f\u4e00\u4e2a\u6307\u5411 socklen_t \u7c7b\u578b\u7684\u6307\u9488，\u7528\u4e8e\u6307\u5b9a src_addr \u7ed3\u6784\u7684\u957f\u5ea6\u3002\u51fd\u6570\u8fd4\u56de\u65f6，\u8be5\u53c2
\n\u6570\u4f1a\u88ab\u66f4\u65b0\u4e3a\u5b9e\u9645\u5b58\u50a8\u7684\u5730\u5740\u7ed3\u6784\u957f\u5ea6\u3002<\/p>\n

\u8fd4\u56de\u503c：
\n \u6210\u529f，\u8fd4\u56de\u5b9e\u9645\u63a5\u6536\u5230\u7684\u5b57\u8282\u6570\u3002
\n \u8fd4\u56de0，\u8868\u793a\u8fde\u63a5\u5df2\u5173\u95ed（\u5bf9\u4e8eTCP\u5957\u63a5\u5b57\u800c\u8a00）\u3002
\n \u8fd4\u56de-1，\u8868\u793a\u8c03\u7528\u5931\u8d25，\u6b64\u65f6\u4f1a\u8bbe\u7f6e errno \u6765\u6307\u793a\u5177\u4f53\u7684\u9519\u8bef\u539f\u56e0\u3002<\/p>\n

\u529f\u80fd：
\n \u7528\u4e8e\u4ece UDP \u5957\u63a5\u5b57\u63a5\u6536\u6570\u636e\u548c\u83b7\u53d6\u53d1\u9001\u65b9\u7684\u5957\u63a5\u5b57\u4fe1\u606f\u3002<\/p>\n

1.1.4 sendto()\u00a0<\/h4>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0sendto()\u00a0\u662f C \u8bed\u8a00\u7f51\u7edc\u7f16\u7a0b\u4e2d\u7684\u4e00\u4e2a\u5173\u952e\u51fd\u6570，\u4e3b\u8981\u7528\u4e8e\u5728\u65e0\u8fde\u63a5\u7684\u5957\u63a5\u5b57（\u5982 UDP）\u4e0a\u53d1\u9001\u6570\u636e\u3002sendto()\u00a0\u5728\u53d1\u9001\u6570\u636e\u65f6\u9700\u8981\u6307\u5b9a\u76ee\u6807\u5730\u5740，\u8fd9\u4f7f\u5f97\u5b83\u975e\u5e38\u9002\u5408 UDP \u8fd9\u79cd\u65e0\u8fde\u63a5\u7684\u901a\u4fe1\u6a21\u5f0f\u3002<\/p>\n

\u539f\u578b：
\n ssize_t sendto(int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen);<\/p>\n

\u5934\u6587\u4ef6：
\n #include <sys\/types.h>
\n #include <sys\/socket.h><\/p>\n

\u53c2\u6570：
\n sockfd：\u8fd9\u662f\u901a\u8fc7 socket() \u51fd\u6570\u521b\u5efa\u7684\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26，\u7528\u4e8e\u6807\u8bc6\u53d1\u9001\u6570\u636e\u7684\u5957\u63a5\u5b57\u3002<\/p>\n

buf：\u6307\u5411\u8981\u53d1\u9001\u6570\u636e\u7684\u7f13\u51b2\u533a\u7684\u6307\u9488\u3002<\/p>\n

len：\u8981\u53d1\u9001\u6570\u636e\u7684\u957f\u5ea6（\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d）\u3002<\/p>\n

flags：\u53ef\u9009\u7684\u6807\u5fd7\u53c2\u6570，\u901a\u5e38\u8bbe\u7f6e\u4e3a 0\u3002\u5e38\u89c1\u7684\u6807\u5fd7\u9009\u9879\u6709：MSG_DONTWAIT：\u5c06\u64cd\u4f5c\u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\u6a21
\n\u5f0f\u3002MSG_NOSIGNAL：\u907f\u514d\u5728\u8fde\u63a5\u65ad\u5f00\u65f6\u53d1\u9001 SIGPIPE \u4fe1\u53f7\u3002<\/p>\n

dest_addr：\u6307\u5411\u76ee\u6807\u5730\u5740\u7684\u6307\u9488，\u7c7b\u578b\u4e3a struct sockaddr\u3002\u5bf9\u4e8e IPv4，\u901a\u5e38\u4f7f\u7528 struct
\nsockaddr_in；\u5bf9\u4e8e IPv6，\u5219\u4f7f\u7528 struct sockaddr_in6\u3002<\/p>\n

addrlen：\u76ee\u6807\u5730\u5740\u7ed3\u6784\u7684\u957f\u5ea6，\u7c7b\u578b\u4e3a socklen_t\u3002<\/p>\n

\u8fd4\u56de\u503c：
\n \u6210\u529f，\u8fd4\u56de\u5b9e\u9645\u53d1\u9001\u7684\u5b57\u8282\u6570（\u53ef\u80fd\u5c0f\u4e8e\u8bf7\u6c42\u53d1\u9001\u7684\u5b57\u8282\u6570）\u3002
\n \u5931\u8d25，\u8fd4\u56de-1，\u5e76\u8bbe\u7f6e errno \u6765\u6307\u793a\u5177\u4f53\u7684\u9519\u8bef\u539f\u56e0\u3002<\/p>\n

\u529f\u80fd：
\n \u4e3b\u8981\u7528\u4e8e\u5728\u65e0\u8fde\u63a5\u7684\u5957\u63a5\u5b57（\u5982 UDP）\u4e0a\u53d1\u9001\u6570\u636e\u3002<\/p>\n

1.1.5 inet_ntoa()<\/h4>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0inet_ntoa()\u00a0\u662f C \u8bed\u8a00\u7f51\u7edc\u7f16\u7a0b\u4e2d\u7684\u4e00\u4e2a\u5173\u952e\u51fd\u6570，\u5176\u4e3b\u8981\u4f5c\u7528\u662f\u5c06\u00a032 \u4f4d\u4e8c\u8fdb\u5236 IPv4 \u5730\u5740\u8f6c\u6362\u4e3a\u00a0\u70b9\u5206\u5341\u8fdb\u5236\u5b57\u7b26\u4e32（\u5982\u00a0192.168.1.1）\u3002<\/p>\n

\u539f\u578b：
\n char *inet_ntoa(struct in_addr in);<\/p>\n

\u5934\u6587\u4ef6：
\n #include <sys\/socket.h>
\n #include <netinet\/in.h>
\n #include <arpa\/inet.h><\/p>\n

\u53c2\u6570：
\n in：struct in_addr \u7c7b\u578b\u7684\u7ed3\u6784\u4f53，\u8be5\u7ed3\u6784\u4f53\u5185\u90e8\u6709\u4e00\u4e2a s_addr \u6210\u5458，\u7528\u4e8e\u5b58\u50a8 32 \u4f4d\u7684 IPv4 \u5730\u5740
\n（\u4ee5\u7f51\u7edc\u5b57\u8282\u5e8f\u8868\u793a）\u3002<\/p>\n

\u8fd4\u56de\u503c：
\n \u8fd4\u56de\u4e00\u4e2a\u6307\u5411\u70b9\u5206\u5341\u8fdb\u5236\u5b57\u7b26\u4e32\u98ce\u683c\u7684ip\u5730\u5740\u3002<\/p>\n

\u529f\u80fd：
\n \u5c06 32 \u4f4d\u4e8c\u8fdb\u5236 IPv4 \u7f51\u7edc\u5b57\u8282\u5e8f\u7684 ip \u5730\u5740\u8f6c\u6362\u4e3a\u70b9\u5206\u5341\u8fdb\u5236\u5b57\u7b26\u4e32（\u5982 192.168.1.1）<\/p>\n

1.1.6 inet_addr()<\/h4>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0inet_addr()\u00a0\u662f C \u8bed\u8a00\u7f51\u7edc\u7f16\u7a0b\u4e2d\u7684\u4e00\u4e2a\u57fa\u7840\u51fd\u6570，\u5176\u4e3b\u8981\u529f\u80fd\u662f\u5c06\u70b9\u5206\u5341\u8fdb\u5236\u683c\u5f0f（\u5982\u00a0192.168.1.1）\u7684 IPv4 \u5730\u5740\u8f6c\u6362\u4e3a\u00a032 \u4f4d\u4e8c\u8fdb\u5236\u7f51\u7edc\u5b57\u8282\u5e8f\u6574\u6570\u3002<\/p>\n

\u539f\u578b：
\n in_addr_t inet_addr(const char *cp);<\/p>\n

\u5934\u6587\u4ef6：
\n #include <sys\/types.h>
\n #include <netinet\/in.h>
\n #include <arpa\/inet.h><\/p>\n

\u53c2\u6570：
\n cp：\u6307\u5411\u70b9\u5206\u5341\u8fdb\u5236\u5b57\u7b26\u4e32\u7684\u6307\u9488，\u4f8b\u5982 "127.0.0.1"\u3002<\/p>\n

\u8fd4\u56de\u503c：
\n \u6210\u529f，\u8fd4\u56de in_addr_t \u7c7b\u578b\u7684 32 \u4f4d\u6574\u6570（\u7f51\u7edc\u5b57\u8282\u5e8f）\u3002
\n \u5931\u8d25，\u8fd4\u56de INADDR_NONE（\u901a\u5e38\u4e3a 0xFFFFFFFF），\u8fd9\u610f\u5473\u7740\u65e0\u6cd5\u89e3\u6790\u8f93\u5165\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n

\u529f\u80fd：
\n \u5c06\u70b9\u5206\u5341\u8fdb\u5236\u5b57\u7b26\u4e32\u98ce\u683c\u7684 ip \u5730\u5740，\u8f6c\u6362\u4e3a4\u5b57\u8282\u7684\u7f51\u7edc\u5b57\u8282\u5e8f\u6574\u6570\u3002<\/p>\n

1.2\u00a0Udp \u670d\u52a1\u7aef\u7684\u5c01\u88c5 — UdpServer.hpp<\/h3>\n

#pragma once<\/p>\n

#include <iostream>
\n#include <string>
\n#include <strings.h>
\n#include <sys\/types.h>
\n#include <sys\/socket.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <functional>
\n#include "Log.hpp"<\/p>\n

using namespace LogModule;
\nusing func_t = std::function<std::string(const std::string&)>; \/\/ \u53c2\u6570\u4e3astring& \u8fd4\u56de\u503c\u4e3a string \u7684\u51fd\u6570\u7c7b\u578b<\/p>\n

const int defaultfd = -1;<\/p>\n

class UdpServer
\n{
\npublic:
\n UdpServer(uint16_t port, func_t func)
\n : _sockfd(defaultfd),
\n _port(port),
\n _isrunning(false),
\n _func(func)
\n {}<\/p>\n

void Init()
\n {
\n \/\/ 1. \u521b\u5efa\u5957\u63a5\u5b57
\n _sockfd = socket(AF_INET, SOCK_DGRAM, 0);
\n if (_sockfd < 0)
\n {
\n \/\/ \u521b\u5efa\u5957\u63a5\u5b57\u5931\u8d25
\n LOG(LogLevel::FATAL) << "socket create error!";
\n exit(1);
\n }
\n LOG(LogLevel::INFO) << "socket create seccess, sockfd: " << _sockfd; \/\/ \u521b\u5efa\u6210\u529f\u53ea\u662f\u6253\u5f00\u6587\u4ef6<\/p>\n

\/\/ 2. \u7ed1\u5b9a socket \u4fe1\u606f，ip \u548c \u7aef\u53e3\u53f7
\n \/\/ 2.1 \u586b\u5145 sockaddr_in \u7ed3\u6784\u4f53
\n struct sockaddr_in local; \/\/ \u7528\u4e8e\u7f51\u7edc\u901a\u4fe1\u7684\u7ed3\u6784\u4f53
\n bzero(&local, sizeof(local));
\n local.sin_family = AF_INET;
\n local.sin_port = htons(_port); \/\/ \u4e3b\u673a\u5b57\u8282\u5e8f\u8f6c\u6210\u7f51\u7edc\u5b57\u8282\u5e8f
\n \/\/ \u670d\u52a1\u7aef\u4e0d\u5efa\u8bae\u624b\u52a8bind\u7279\u5b9aip
\n \/\/ \u5f53\u4e00\u4e2a\u673a\u5668\u6709\u591a\u5f20\u7f51\u5361\u7684\u65f6\u5019，\u670d\u52a1\u7aef ip \u7ed1\u5b9aINADDR_ANY，\u5c31\u53ef\u4ee5\u63a5\u6536\u4efb\u610fip\u4e2d\u7aef\u53e3\u53f7\u4e3aport
\n local.sin_addr.s_addr = INADDR_ANY;<\/p>\n

\/\/ 2.2 \u7ed1\u5b9a\u670d\u52a1\u5668\u7684\u5957\u63a5\u5b57\u4fe1\u606f
\n \/\/ \u4e3a\u4ec0\u4e48\u670d\u52a1\u5668\u7aef\u8981\u663e\u5f0f\u7684bind？
\n \/\/ \u670d\u52a1\u5668\u7684ip\u548c\u7aef\u53e3\u53f7\u5fc5\u987b\u662f\u4f17\u6240\u5468\u77e5\u4e14\u4e0d\u80fd\u8f7b\u6613\u6539\u53d8\u7684.
\n int n = bind(_sockfd, (struct sockaddr*)&local, sizeof(local));
\n if (n < 0)
\n {
\n LOG(LogLevel::FATAL) << "bind error";
\n exit(2);
\n }
\n LOG(LogLevel::INFO) << "bind success, sockfd: " << _sockfd;
\n }<\/p>\n

void Start()
\n {
\n _isrunning = true;
\n while(_isrunning) \/\/ \u542f\u52a8\u670d\u52a1\u5668\u4e4b\u540e\u662f\u6b7b\u5faa\u73af
\n {
\n \/\/ 1. \u521b\u5efa\u7528\u4e8e\u63a5\u6536\u6d88\u606f\u7684\u7f13\u51b2\u5668\u53d8\u91cf buffer \u4ee5\u53ca\u63a5\u6536\u8fdc\u7aef\u4e3b\u673a\u7684\u5957\u63a5\u5b57\u53d8\u91cf peer
\n char buffer[1024];
\n struct sockaddr_in peer; \/\/ \u5ba2\u6237\u7aef\u5957\u63a5\u5b57\u7ed3\u6784\u4f53
\n socklen_t len = sizeof(peer);<\/p>\n

\/\/ 2. \u6536\u6d88\u606f，\u670d\u52a1\u7aef\u6536\u53d6\u5ba2\u6237\u7aef\u7684\u6570\u636e，\u5bf9\u6570\u636e\u8fdb\u884c\u5904\u7406
\n \/\/ \u4ece _sockfd \u6307\u5411\u7684\u7f51\u7edc\u6587\u4ef6\u4e2d\u6536\u53d6\u5ba2\u6237\u7aef peer \u53d1\u9001\u7684 sizeof(buffer) – 1 \u4e2a\u5b57\u8282\u4ee5\u53ca\u5ba2\u6237\u7aef\u7684\u5957\u63a5\u5b57\u4fe1\u606f
\n \/\/ \u7b2c\u56db\u4e2a\u53c2\u6570\u4e3a0，\u8868\u793a\u963b\u585e\u8bfb
\n ssize_t s = recvfrom(_sockfd, buffer, sizeof(buffer) – 1, 0, (struct sockaddr*)&peer, &len);
\n if (s > 0) \/\/ \u6536\u5230\u6d88\u606f，s\u8868\u793a\u6536\u5230\u6570\u636e\u7684\u5b57\u8282\u6570
\n {
\n int peer_port = ntohs(peer.sin_port); \/\/ \u5c06\u5ba2\u6237\u7aef\u7aef\u53e3\u53f7\u8f6c\u6210\u4e3b\u673a\u5b57\u8282\u5e8f
\n std::string peer_ip = inet_ntoa(peer.sin_addr); \/\/ \u5c06\u5ba2\u6237\u7aefip\u8f6c\u4e3a\u5b57\u7b26\u4e32\u98ce\u683c\u7684ip
\n buffer[s] = 0;<\/p>\n

\/\/ \u670d\u52a1\u7aef\u663e\u5f0f\u53d1\u9001\u6d88\u606f\u7684\u5ba2\u6237\u7aef\u4fe1\u606f
\n LOG(LogLevel::DEBUG) << "[" << peer_ip << ":" << peer_port << "]# " << buffer;<\/p>\n

\/\/ 2. \u53d1\u6d88\u606f，\u5c06\u6d88\u606f\u8fdb\u884c\u5904\u7406\u540e\u56de\u53d1\u7ed9\u5ba2\u6237\u7aef
\n std::string result = buffer;
\n result = _func(buffer);
\n sendto(_sockfd, result.c_str(), result.size(), 0, (struct sockaddr*)&peer, len);
\n }
\n }
\n }<\/p>\n

~UdpServer()
\n {}<\/p>\n

private:
\n int _sockfd; \/\/ \u5957\u63a5\u5b57\u63cf\u8ff0\u7b26
\n uint16_t _port; \/\/ \u7aef\u53e3\u53f7
\n bool _isrunning;\/\/ \u8fd0\u884c\u6807\u5fd7\u4f4d
\n func_t _func; \/\/ \u670d\u52a1\u7aef\u5904\u7406\u6570\u636e\u7684\u56de\u8c03\u51fd\u6570
\n}; <\/p>\n

1.3\u00a0\u670d\u52a1\u7aef\u4ee3\u7801 — UdpServer.cc<\/h3>\n

#include <memory>
\n#include "UdpServer.hpp"<\/p>\n

std::string defaultHandler(const std::string &message)
\n{
\n std::string s = "server say@ ";
\n s += message;
\n return s;
\n}<\/p>\n

\/\/ \u901a\u8fc7\u547d\u4ee4\u884c .\/udpserver port \u542f\u52a8\u670d\u52a1\u5668
\nint main(int argc, char *argv[])
\n{
\n if (argc != 2)
\n {
\n std::cerr << "Usage: " << argv[0] << " port" << std::endl;
\n return 1;
\n }<\/p>\n

uint16_t port = std::stoi(argv[1]);
\n Enable_Console_Log_Strategy();<\/p>\n

std::unique_ptr<UdpServer> usvr = std::make_unique<UdpServer>(port, defaultHandler);
\n usvr->Init();
\n usvr->Start();
\n return 0;
\n} <\/p>\n

1.4\u00a0\u5ba2\u6237\u7aef\u4ee3\u7801 — UdpClient.cc<\/h3>\n

1.4.1 Linux\u7248\u672c\u7684\u5ba2\u6237\u7aef<\/h4>\n

#include <iostream>
\n#include <cstring>
\n#include <sys\/types.h>
\n#include <sys\/socket.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h><\/p>\n

\/\/ \u901a\u8fc7\u547d\u4ee4\u884c .\/udpclient server_ip server_port \u542f\u52a8\u5ba2\u6237\u7aef
\nint main(int argc, char *argv[])
\n{
\n \/\/ \u5ba2\u6237\u7aef\u8bbf\u95ee\u76ee\u6807\u670d\u52a1\u5668\u9700\u8981\u77e5\u9053\u4ec0\u4e48
\n \/\/ \u9700\u8981\u670d\u52a1\u5668\u7684ip\u548c\u7aef\u53e3
\n \/\/ \u600e\u4e48\u77e5\u9053\u670d\u52a1\u5668\u7684ip\u548c\u7aef\u53e3\u5462 — \u5185\u7f6e\u7684ip<\/p>\n

if (argc != 3)
\n {
\n std::cerr << "Usage: " << argv[0] << " server_ip server_port" << std::endl;
\n return 1;
\n }<\/p>\n

std::string server_ip = argv[1];
\n uint16_t server_port = std::stoi(argv[2]);<\/p>\n

\/\/ 1. \u521b\u5efa\u5957\u63a5\u5b57
\n int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
\n if (sockfd < 0)
\n {
\n std::cerr << "socket create error" << std::endl;
\n return 2;
\n }<\/p>\n

\/\/ 2. \u586b\u5145\u670d\u52a1\u7aef\u7684\u5957\u63a5\u5b57\u4fe1\u606f
\n struct sockaddr_in server;
\n memset(&server, 0, sizeof(server));
\n server.sin_family = AF_INET; \/\/ AF_INET \u6216\u8005 PF_INET
\n server.sin_port = htons(server_port);
\n server.sin_addr.s_addr = inet_addr(server_ip.c_str());<\/p>\n

\/\/ client\u4e0d\u9700\u8981\u663e\u5f0f\u7684bind，\u9996\u6b21\u53d1\u9001\u6d88\u606f，\u64cd\u4f5c\u7cfb\u7edf\u81ea\u52a8\u7ed9client\u8fdb\u884cbind，
\n \/\/ \u7aef\u53e3\u53f7\u91c7\u7528\u968f\u673a\u7aef\u53e3\u53f7，\u4e00\u4e2a\u7aef\u53e3\u53f7\u53ea\u80fd\u88ab\u4e00\u4e2a\u8fdb\u7a0bbind，\u4e3a\u4e86\u907f\u514dclient\u7aef\u53e3\u51b2\u7a81
\n \/\/ client\u7aef\u53e3\u53f7\u662f\u591a\u5c11\u4e0d\u91cd\u8981，\u53ea\u8981\u662f\u552f\u4e00\u7684\u5c31\u884c<\/p>\n

while(true)
\n {
\n \/\/ 1. \u7ed9\u5ba2\u6237\u7aef\u53d1\u6d88\u606f
\n std::string input;
\n std::cout << "Please Enter# ";
\n if (input.empty()) continue;
\n std::getline(std::cin, input);
\n int n = sendto(sockfd, input.c_str(), input.size(), 0, (struct sockaddr*)&server, sizeof(server));
\n (void)n;<\/p>\n

\/\/ 2. \u56de\u663e\u6d88\u606f
\n char buffer[1024];
\n struct sockaddr_in peer;
\n socklen_t len = sizeof(peer);
\n int m = recvfrom(sockfd, buffer, sizeof(buffer) – 1, 0, (struct sockaddr*)&peer, &len);
\n if (m > 0)
\n {
\n buffer[m] = 0;
\n std::cout << buffer << std::endl;
\n }
\n }
\n return 0;
\n} <\/p>\n

1.4.2 Windows \u7248\u672c\u7684\u5ba2\u6237\u7aef<\/h4>\n

#define _CRT_SECURE_NO_WARNINGS<\/p>\n

#include <iostream>
\n#include <cstdio>
\n#include <thread>
\n#include <string>
\n#include <cstdlib>
\n\/\/ Windows\u4e2d\u9700\u8981\u5305\u542b\u7684\u5934\u6587\u4ef6
\n#include <WinSock2.h>
\n#include <Windows.h><\/p>\n

#pragma warning(disable : 4996)\/\/ \u5c4f\u853d\u4e00\u4e9b warning \u62a5\u9519<\/p>\n

#pragma comment(lib, "ws2_32.lib")\/\/ \u5f15\u5165 ws2_32.lib \u5e93<\/p>\n

std::string server_ip = "\u670d\u52a1\u5668ip\u5730\u5740";\/\/ \u670d\u52a1\u5668ip
\nuint16_t server_port = 8888;\/\/ \u670d\u52a1\u5668\u7aef\u53e3\u53f7<\/p>\n

int main()
\n{
\nWSADATA wsd;
\nWSAStartup(MAKEWORD(2, 2), &wsd);\/\/ \u6784\u5efa 2.2 \u7248\u672c<\/p>\n

\/\/ 1. \u521b\u5efa udp \u5957\u63a5\u5b57
\nSOCKET sockfd = socket(AF_INET, SOCK_DGRAM, 0);\/\/ SOCKET == int
\nif (sockfd == SOCKET_ERROR)
\n{
\nstd::cerr << "socket create error" << std::endl;
\nreturn 1;
\n}<\/p>\n

\/\/ 2. \u586b\u5145 sockaddr_in \u7ed3\u6784\u4f53
\nstruct sockaddr_in server;
\nmemset(&server, 0, sizeof(server));
\nserver.sin_family = AF_INET;
\nserver.sin_port = htons(server_port);
\nserver.sin_addr.s_addr = inet_addr(server_ip.c_str());<\/p>\n

std::string message;
\nchar buffer[1024];
\nwhile (true)
\n{
\n\/\/ 3. \u53d1\u4fe1\u606f\u7ed9\u670d\u52a1\u7aef
\nstd::cout << "Please Enter# ";
\nstd::getline(std::cin, message);
\nif (message.empty()) continue;
\nsendto(sockfd, message.c_str(), sizeof(buffer), 0, (struct sockaddr*)&server, sizeof(server));<\/p>\n

\/\/ 4. \u6536\u6d88\u606f，\u5e76\u663e\u793a\u5230\u663e\u793a\u5668\u4e0a
\nstruct sockaddr_in temp;
\nint len = sizeof(temp);
\nint s = recvfrom(sockfd, buffer, sizeof(buffer) – 1, 0, (struct sockaddr*)&temp, &len);
\nif (s > 0)
\n{
\nbuffer[s] = 0;
\nstd::cout << buffer << std::endl;
\n}
\n}<\/p>\n

closesocket(sockfd);
\nWSACleanup();
\nreturn 0;
\n} <\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0WinSock2.h \u662f Windows Sockets API（\u5e94\u7528\u7a0b\u5e8f\u63a5\u53e3）\u7684\u5934\u6587\u4ef6，\u7528\u4e8e\u5728Windows \u5e73\u53f0\u4e0a\u8fdb\u884c\u7f51\u7edc\u7f16\u7a0b\u3002\u5b83\u5305\u542b\u4e86 Windows Sockets 2（Winsock2）\u6240\u9700\u7684\u6570\u636e\u7c7b\u578b\u3001\u51fd\u6570\u58f0\u660e\u548c\u7ed3\u6784\u5b9a\u4e49，\u4f7f\u5f97\u5f00\u53d1\u8005\u80fd\u591f\u521b\u5efa\u548c\u4f7f\u7528\u5957\u63a5\u5b57（sockets）\u8fdb\u884c\u7f51\u7edc\u901a\u4fe1\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u7f16\u5199\u4f7f\u7528 Winsock2 \u7684\u7a0b\u5e8f\u65f6，\u9700\u8981\u5728\u6e90\u6587\u4ef6\u4e2d\u5305\u542b WinSock2.h \u5934\u6587\u4ef6\u3002\u8fd9\u6837，\u7f16\u8bd1\u5668\u5c31\u80fd\u591f\u8bc6\u522b\u5e76\u7406\u89e3 Winsock2 \u4e2d\u5b9a\u4e49\u7684\u6570\u636e\u7c7b\u578b\u548c\u51fd\u6570，\u4ece\u800c\u80fd\u591f\u6b63\u786e\u5730\u7f16\u8bd1\u548c\u94fe\u63a5\u7f51\u7edc\u76f8\u5173\u7684\u4ee3\u7801\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6b64\u5916，\u4e0e WinSock2.h \u5934\u6587\u4ef6\u76f8\u5bf9\u5e94\u7684\u662f ws2_32.lib \u5e93\u6587\u4ef6\u3002\u5728\u94fe\u63a5\u9636\u6bb5，\u9700\u8981\u5c06\u8fd9\u4e2a\u5e93\u6587\u4ef6\u94fe\u63a5\u5230\u7a0b\u5e8f\u4e2d，\u4ee5\u786e\u4fdd\u8fd0\u884c\u65f6\u80fd\u591f\u627e\u5230\u5e76\u8c03\u7528 Winsock2 API \u4e2d\u5b9e\u73b0\u7684\u51fd\u6570\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728 WinSock2.h \u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e9b\u91cd\u8981\u7684\u6570\u636e\u7c7b\u578b\u548c\u51fd\u6570，\u5982： \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0WSADATA：\u4fdd\u5b58\u521d\u59cb\u5316 Winsock \u5e93\u65f6\u8fd4\u56de\u7684\u4fe1\u606f\u3002 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0SOCKET：\u8868\u793a\u4e00\u4e2a\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26\u7c7b\u578b，\u7528\u4e8e\u5728\u7f51\u7edc\u4e2d\u552f\u4e00\u6807\u8bc6\u4e00\u4e2a\u5957\u63a5\u5b57\u3002 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0sockaddr_in：IPv4 \u5730\u5740\u7ed3\u6784\u4f53，\u7528\u4e8e\u5b58\u50a8 IP \u5730\u5740\u548c\u7aef\u53e3\u53f7\u7b49\u4fe1\u606f\u3002 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0socket()：\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5957\u63a5\u5b57\u3002 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0bind()：\u5c06\u5957\u63a5\u5b57\u4e0e\u672c\u5730\u5730\u5740\u7ed1\u5b9a\u3002 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0listen()：\u5c06\u5957\u63a5\u5b57\u8bbe\u7f6e\u4e3a\u76d1\u542c\u6a21\u5f0f，\u7b49\u5f85\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42\u3002 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0accept()：\u63a5\u53d7\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42，\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u5957\u63a5\u5b57\u63cf\u8ff0\u7b26，\u7528\u4e8e\u4e0e\u5ba2\u6237\u7aef\u8fdb\u884c\u901a\u4fe1\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0WSAStartup \u51fd\u6570\u662f Windows Sockets API \u7684\u521d\u59cb\u5316\u51fd\u6570，\u5b83\u7528\u4e8e\u521d\u59cb\u5316Winsock \u5e93\u3002\u8be5\u51fd\u6570\u5728\u5e94\u7528\u7a0b\u5e8f\u6216 DLL \u8c03\u7528\u4efb\u4f55 Windows \u5957\u63a5\u5b57\u51fd\u6570\u4e4b\u524d\u5fc5\u987b\u9996\u5148\u6267\u884c，\u5b83\u626e\u6f14\u7740\u521d\u59cb\u5316\u7684\u89d2\u8272\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4ee5\u4e0b\u662f WSAStartup \u51fd\u6570\u7684\u4e00\u4e9b\u5173\u952e\u70b9：<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5b83\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570：wVersionRequested \u548c lpWSAData\u3002wVersionRequested \u7528\u4e8e\u6307\u5b9a\u6240\u8bf7\u6c42\u7684 Winsock \u7248\u672c，\u901a\u5e38\u4f7f\u7528 MAKEWORD(major, minor)\u5b8f，\u5176\u4e2dmajor \u548c minor \u5206\u522b\u8868\u793a\u8bf7\u6c42\u7684\u4e3b\u7248\u672c\u53f7\u548c\u6b21\u7248\u672c\u53f7\u3002lpWSAData \u662f\u4e00\u4e2a\u6307\u5411 WSADATA\u00a0\u7ed3\u6784\u7684\u6307\u9488，\u7528\u4e8e\u63a5\u6536\u521d\u59cb\u5316\u4fe1\u606f\u3002\u51fd\u6570\u8c03\u7528\u6210\u529f，\u5b83\u4f1a\u8fd4\u56de 0；\u5426\u5219，\u8fd4\u56de\u9519\u8bef\u4ee3\u7801\u3002<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u8c03\u7528 WSAStartup \u51fd\u6570\u540e，\u5982\u679c\u5e94\u7528\u7a0b\u5e8f\u5b8c\u6210\u4e86\u5bf9\u8bf7\u6c42\u7684 Socket \u5e93\u7684\u4f7f\u7528，\u5e94\u8c03\u7528 WSACleanup \u51fd\u6570\u6765\u89e3\u9664\u4e0e Socket \u5e93\u7684\u7ed1\u5b9a\u5e76\u91ca\u653e\u6240\u5360\u7528\u7684\u7cfb\u7edf\u8d44\u6e90\u3002<\/p>\n

1.5 demo \u6f14\u793a<\/h3>\n

\u00a0 \u00a0 \u00a0 \u00a0 （1）\u672c\u5730\u4f7f\u7528\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u8fdb\u884c\u901a\u4fe1\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u670d\u52a1\u7aef\u56e0\u4e3a\u670d\u52a1\u7aef ip \u8fdb\u884c\u7ed1\u5b9a\u7684\u65f6\u5019\u7ed1\u5b9a\u7684\u662f INADDR_ANY，\u6240\u4ee5\u670d\u52a1\u7aef\u542f\u52a8\u7684\u65f6\u5019\u4ec5\u9700\u8981\u4f20\u5165\u7aef\u53e3\u53f7\u3002<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5ba2\u6237\u7aef\u542f\u52a8\u7684\u65f6\u5019，\u53ef\u4ee5\u4f20\u5165 \u5185\u7f51 ip \u6216\u8005 \u672c\u5730\u73af\u56de ip：127.0.0.1 \u548c\u7aef\u53e3\u53f7\u3002<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u542f\u52a8\u4e4b\u540e\u5373\u53ef\u8fdb\u884c\u901a\u4fe1，\u670d\u52a1\u7aef\u663e\u5f0f\u5ba2\u6237\u7aef\u7684\u5957\u63a5\u5b57\u4fe1\u606f\u4ee5\u53ca\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u4fe1\u606f，\u5ba2\u6237\u7aef\u56de\u663e\u53d1\u9001\u7684\u4fe1\u606f：<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 （2）\u8de8\u7f51\u7edc\u4f7f\u7528\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u8fdb\u884c\u901a\u4fe1\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u670d\u52a1\u7aef\u542f\u52a8\u7684\u65f6\u5019\u4e5f\u4ec5\u4f20\u5165\u7aef\u53e3\u53f7\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u5ba2\u6237\u7aef\u542f\u52a8\u7684\u65f6\u5019\u4f20\u5165\u670d\u52a1\u7aef\u8fdb\u7a0b\u7684\u516c\u7f51 ip \u548c\u7aef\u53e3\u53f7\u3002Windows \u7cfb\u7edf\u4e0b\u4e5f\u4e00\u6837，\u4f46\u662fWindows\u4e0b\u9700\u8981\u542f\u52a8 Windows \u7248\u672c\u7684\u5ba2\u6237\u7aef\u3002<\/p>\n

1.6 \u7f51\u7edc\u76f8\u5173\u547d\u4ee4<\/h3>\n

\u00a0 \u00a0 \u00a0 \u00a0 ping [-\u9009\u9879] [\u7f51\u5740\u6216ip]<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u529f\u80fd：\u7528\u4e8e\u68c0\u6d4b\u4e3b\u673a\u662f\u5426\u4e0e\u7f51\u7edc\u8fdb\u884c\u4e86\u8fde\u63a5\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5e38\u7528\u9009\u9879：<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0c[\u6b21\u6570]，\u9ed8\u8ba4\u60c5\u51b5\u4e0b ping \u662f\u4f1a\u4e00\u76f4\u6301\u7eed\u4e0b\u53bb\u7684，\u8fd9\u4e2a\u9009\u9879\u8868\u793a ping \u7684\u6b21\u6570\u3002<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4e0a\u8ff0\u8868\u793a\u5bf9\u767e\u5ea6\u7684\u7f51\u7ad9 ping 3 \u6b21\u3002\u00a0<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 netstat [-\u9009\u9879]<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u529f\u80fd：\u67e5\u770b\u7f51\u7edc\u72b6\u6001\u4fe1\u606f\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5e38\u7528\u9009\u9879：<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 n：\u62d2\u7edd\u663e\u793a\u522b\u540d，\u80fd\u663e\u793a\u6570\u5b57\u7684\u5168\u90e8\u8f6c\u5316\u6210\u6570\u5b57\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 l：\u4ec5\u5217\u51fa\u6709\u5728 Listen（\u76d1\u542c）\u7684\u670d\u52a1\u72b6\u6001\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 p：\u663e\u793a\u5efa\u7acb\u76f8\u5173\u94fe\u63a5\u7684\u7a0b\u5e8f\u540d\u548cpid\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 t：\u4ec5\u663e\u793a tcp \u76f8\u5173\u670d\u52a1\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 u：\u4ec5\u663e\u793a udp \u76f8\u5173\u670d\u52a1\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 a：\u663e\u793a\u6240\u6709\u9009\u9879，\u9ed8\u8ba4\u662f\u4e0d\u663e\u793a LISTEN \u76f8\u5173\u3002<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4e0a\u8ff0\u547d\u4ee4\u663e\u793a\u6240\u6709\u4e0e udp \u76f8\u5173\u7684\u7f51\u7edc\u670d\u52a1\u3002\u00a0<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u589e\u52a0 p \u9009\u9879\u4f1a\u663e\u793a\u8fdb\u7a0b\u540d\u548c\u8fdb\u7a0b pid，\u8fd9\u91cc\u6ca1\u6709\u663e\u793a\u662f\u56e0\u4e3a netstat \u547d\u4ee4\u662f\u7528\u666e\u901a\u7528\u6237\u542f\u52a8\u7684，\u800c\u8fd9\u51e0\u4e2a\u670d\u52a1\u90fd\u662f\u4f7f\u7528\u8d85\u7ea7\u7528\u6237\u542f\u52a8\u7684，\u6709\u6743\u9650\u95ee\u9898\u3002\u00a0<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 n \u9009\u9879\u53ef\u4ee5\u5c06\u80fd\u7528\u6570\u5b57\u663e\u793a\u7684\u4fe1\u606f\u7528\u6570\u5b57\u663e\u793a\u51fa\u6765\u3002\u00a0<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 watch \u547d\u4ee4\u53ef\u4ee5\u5468\u671f\u6027\u7684\u6307\u5411\u547d\u4ee4\u3002\u00a0<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 watch -n 1 netstat -nuap — \u6bcf\u4e2a 1 \u79d2\u6267\u884c\u4e00\u6b21 netstat -nuap \u547d\u4ee4\u3002<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 pidof [\u8fdb\u7a0b\u540d]<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u529f\u80fd：\u67e5\u770b\u8fdb\u7a0b\u7684 pid\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 xargs [\u547d\u4ee4]<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u529f\u80fd：\u5c06\u4e0a\u4e00\u4e2a\u547d\u4ee4\u4f20\u5165\u7ba1\u9053\u7684\u5185\u5bb9\u8f6c\u6362\u6210\u540e\u4e00\u4e2a\u547d\u4ee4\u7684\u53c2\u6570\u3002<\/p>\n

\"\"<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u901a\u8fc7\u4e0a\u8ff0\u547d\u4ee4\u5feb\u901f\u6740\u6389\u542f\u52a8\u7684 udpserver \u8fdb\u7a0b\u3002\u00a0<\/p>\n

2. \u7ffb\u8bd1\u670d\u52a1\u5668 — Translation server<\/h2>\n

2.1 Udp \u670d\u52a1\u7aef\u5c01\u88c5 — UdpServer.hpp<\/h3>\n

#pragma once<\/p>\n

#include <iostream>
\n#include <string>
\n#include <strings.h>
\n#include <sys\/types.h>
\n#include <sys\/socket.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h>
\n#include <functional>
\n#include "Log.hpp"
\n#include "InetAddr.hpp"<\/p>\n

using namespace LogModule;
\nusing func_t = std::function<std::string(const std::string&, InetAddr&)>; \/\/ \u53c2\u6570\u4e3astring& \u8fd4\u56de\u503c\u4e3a string \u7684\u51fd\u6570\u7c7b\u578b<\/p>\n

const int defaultfd = -1;<\/p>\n

class UdpServer
\n{
\npublic:
\n UdpServer(uint16_t port, func_t func)
\n : _sockfd(defaultfd),
\n _port(port),
\n _isrunning(false),
\n _func(func)
\n {}<\/p>\n

void Init()
\n {
\n \/\/ 1. \u521b\u5efa\u5957\u63a5\u5b57
\n _sockfd = socket(AF_INET, SOCK_DGRAM, 0);
\n if (_sockfd < 0)
\n {
\n LOG(LogLevel::FATAL) << "socket create error!";
\n exit(1);
\n }
\n LOG(LogLevel::INFO) << "socket create seccess, sockfd: " << _sockfd;<\/p>\n

\/\/ 2. \u7ed1\u5b9a socket \u4fe1\u606f，ip \u548c \u7aef\u53e3\u53f7
\n struct sockaddr_in local;
\n bzero(&local, sizeof(local));
\n local.sin_family = AF_INET;
\n local.sin_port = htons(_port);
\n local.sin_addr.s_addr = INADDR_ANY;<\/p>\n

\/\/ 2.2 \u7ed1\u5b9a\u670d\u52a1\u5668\u7684\u5957\u63a5\u5b57\u4fe1\u606f
\n int n = bind(_sockfd, (struct sockaddr*)&local, sizeof(local));
\n if (n < 0)
\n {
\n LOG(LogLevel::FATAL) << "bind error";
\n exit(2);
\n }
\n LOG(LogLevel::INFO) << "bind success, sockfd: " << _sockfd;
\n }<\/p>\n

void Start()
\n {
\n _isrunning = true;
\n while(_isrunning)
\n {
\n \/\/ 1. \u521b\u5efa\u7528\u4e8e\u63a5\u6536\u6d88\u606f\u7684\u7f13\u51b2\u5668\u53d8\u91cf buffer \u4ee5\u53ca\u63a5\u6536\u8fdc\u7aef\u4e3b\u673a\u7684\u5957\u63a5\u5b57\u53d8\u91cf peer
\n char buffer[1024];
\n struct sockaddr_in peer;
\n socklen_t len = sizeof(peer);<\/p>\n

\/\/ 2. \u6536\u6d88\u606f，\u670d\u52a1\u7aef\u6536\u53d6\u5ba2\u6237\u7aef\u7684\u6570\u636e，\u5bf9\u6570\u636e\u8fdb\u884c\u5904\u7406
\n ssize_t s = recvfrom(_sockfd, buffer, sizeof(buffer) – 1, 0, (struct sockaddr*)&peer, &len);
\n if (s > 0)
\n {
\n InetAddr client(peer);
\n int peer_port = ntohs(peer.sin_port);
\n std::string peer_ip = inet_ntoa(peer.sin_addr);
\n buffer[s] = 0;<\/p>\n

\/\/ 2. \u53d1\u6d88\u606f，\u5c06\u6d88\u606f\u8fdb\u884c\u5904\u7406\u540e\u56de\u53d1\u7ed9\u5ba2\u6237\u7aef
\n std::string result = _func(buffer, client); \/\/ \u5904\u7406\u6570\u636e
\n sendto(_sockfd, result.c_str(), result.size(), 0, (struct sockaddr*)&peer, len);
\n }
\n }
\n }<\/p>\n

~UdpServer()
\n {}<\/p>\n

private:
\n int _sockfd; \/\/ \u5957\u63a5\u5b57\u63cf\u8ff0\u7b26
\n uint16_t _port; \/\/ \u7aef\u53e3\u53f7
\n bool _isrunning;\/\/ \u8fd0\u884c\u6807\u5fd7\u4f4d
\n func_t _func; \/\/ \u670d\u52a1\u7aef\u5904\u7406\u6570\u636e\u7684\u56de\u8c03\u51fd\u6570
\n}; <\/p>\n

2.2 \u5b57\u5178\u7ed3\u6784\u4f53\u7684\u5c01\u88c5 — Dict.hpp<\/h3>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u5b57\u5178\u6587\u4ef6 — dictionary.txt<\/p>\n

apple: \u82f9\u679c
\nbanana: \u9999\u8549
\ncat: \u732b
\ndog: \u72d7
\nbook: \u4e66
\npen: \u7b14
\nhappy: \u5feb\u4e50\u7684
\nsad: \u60b2\u4f24\u7684
\nhello:
\n: \u4f60\u597d<\/p>\n

run: \u8dd1
\njump: \u8df3
\nteacher: \u8001\u5e08
\nstudent: \u5b66\u751f
\ncar: \u6c7d\u8f66
\nbus: \u516c\u4ea4\u8f66
\nlove: \u7231
\nhate: \u6068
\nhello: \u4f60\u597d
\ngoodbye: \u518d\u89c1
\nsummer: \u590f\u5929
\nwinter: \u51ac\u5929<\/p>\n

#pragma once<\/p>\n

#include <iostream>
\n#include <fstream>
\n#include <string>
\n#include <unordered_map>
\n#include "Log.hpp"
\n#include "InetAddr.hpp"<\/p>\n

const std::string defaultDictPath = ".\/dictionary.txt";
\nconst std::string sep = ": ";<\/p>\n

using namespace LogModule;<\/p>\n

class Dict
\n{
\npublic:
\n Dict(const std::string &path = defaultDictPath)
\n : _dict_path(path)
\n {}<\/p>\n

bool LoadDict()
\n {
\n std::ifstream in(_dict_path);
\n if (!in.is_open())
\n {
\n LOG(LogLevel::DEBUG) << "\u6253\u5f00\u5b57\u5178：" << _dict_path << " \u5931\u8d25";
\n return false;
\n }<\/p>\n

\/\/ 1. \u5faa\u73af\u52a0\u8f7d\u5b57\u5178\u7684\u6bcf\u884c\u6570\u636e
\n std::string line;
\n while(std::getline(in, line))
\n {
\n auto pos = line.find(sep);
\n \/\/ 1.1 \u6392\u9664\u5b57\u5178\u4e2d\u65e0\u6548\u5185\u5bb9
\n if (pos == std::string::npos)
\n {
\n LOG(LogLevel::WARNING) << "\u89e3\u6790: " << line << " \u5931\u8d25";
\n continue;
\n }<\/p>\n

\/\/ 1.2 \u5c06\u6709\u6548\u5185\u5bb9\u8fdb\u884c\u52a0\u8f7d
\n std::string english = line.substr(0, pos);
\n std::string chinese = line.substr(pos + sep.size());
\n _dict.insert(std::make_pair(english, chinese));
\n if (english.empty() || chinese.empty())
\n {
\n LOG(LogLevel::WARNING) << line << "\u6ca1\u6709\u6709\u6548\u5185\u5bb9";
\n continue;
\n }<\/p>\n

_dict.insert(std::make_pair(english, chinese));
\n LOG(LogLevel::DEBUG) << "\u52a0\u8f7d: " << line << " \u6210\u529f";
\n }<\/p>\n

in.close();
\n return true;
\n }<\/p>\n

std::string Translate(const std::string &word, InetAddr &client)
\n {
\n auto iter = _dict.find(word);
\n if (iter == _dict.end())
\n {
\n LOG(LogLevel::DEBUG) << "\u8fdb\u5165\u5230\u4e86\u7ffb\u8bd1\u6a21\u5757，[" << client.Ip() << " : " << client.Port() << "]# " << word << "->None";
\n return "None";
\n }
\n LOG(LogLevel::DEBUG) << "\u8fdb\u5165\u5230\u4e86\u7ffb\u8bd1\u6a21\u5757，[" << client.Ip() << " : " << client.Port() << "]# " << word << "->" << iter->second;
\n return iter->second;
\n }<\/p>\n

~Dict()
\n {}<\/p>\n

private:
\n std::string _dict_path; \/\/ \u8def\u5f84 + \u6587\u4ef6\u540d
\n std::unordered_map<std::string, std::string> _dict;
\n}; <\/p>\n

2.3 \u7f51\u7edc\u5730\u5740\u8f6c\u4e3b\u673a\u5730\u5740\u7684\u5c01\u88c5 — InetAddr.hpp<\/h3>\n

#pragma once
\n#include <iostream>
\n#include <string>
\n#include <sys\/socket.h>
\n#include <sys\/types.h>
\n#include <arpa\/inet.h>
\n#include <netinet\/in.h><\/p>\n

class InetAddr
\n{
\npublic:
\n InetAddr(struct sockaddr_in &addr) : _addr(addr)
\n {
\n _port = ntohs(_addr.sin_port);
\n _ip = inet_ntoa(_addr.sin_addr);
\n }<\/p>\n

uint16_t Port() {return _port;}
\n std::string Ip() {return _ip;}<\/p>\n

~InetAddr()
\n {}
\nprivate:
\n struct sockaddr_in _addr;
\n std::string _ip;
\n uint16_t _port;
\n}; <\/p>\n

2.4\u00a0Udp \u670d\u52a1\u7aef — UdpServer.cc<\/h3>\n

#include <memory>
\n#include "UdpServer.hpp"
\n#include "Dict.hpp"<\/p>\n

\/\/ \u56de\u663e\u670d\u52a1\u7ecf\u5e38\u7528\u4e8e\u68c0\u6d4b
\nstd::string defaultHandler(const std::string &message)
\n{
\n std::string s = "server say@ ";
\n s += message;
\n return s;
\n}<\/p>\n

\/\/ \u901a\u8fc7\u547d\u4ee4\u884c .\/udpserver port \u542f\u52a8\u670d\u52a1\u5668
\nint main(int argc, char *argv[])
\n{
\n if (argc != 2)
\n {
\n std::cerr << "Usage: " << argv[0] << " port" << std::endl;
\n return 1;
\n }<\/p>\n

uint16_t port = std::stoi(argv[1]);
\n Enable_Console_Log_Strategy();<\/p>\n

\/\/ 1. \u5b57\u5178\u5bf9\u8c61，\u63d0\u4f9b\u7ffb\u8bd1\u529f\u80fd
\n Dict dict;
\n dict.LoadDict();<\/p>\n

\/\/ 2. \u7f51\u7edc\u670d\u52a1\u5668\u5bf9\u8c61，\u63d0\u4f9b\u901a\u4fe1\u529f\u80fd
\n std::unique_ptr<UdpServer> usvr = std::make_unique<UdpServer>(port, [&dict](const std::string &word, InetAddr &client)->std::string{
\n return dict.Translate(word, client);
\n });
\n usvr->Init();
\n usvr->Start();
\n return 0;
\n} <\/p>\n

2.5\u00a0Udp \u5ba2\u6237\u7aef — UdpClient.cc<\/h3>\n

#include <iostream>
\n#include <cstring>
\n#include <sys\/types.h>
\n#include <sys\/socket.h>
\n#include <netinet\/in.h>
\n#include <arpa\/inet.h><\/p>\n

\/\/ \u901a\u8fc7\u547d\u4ee4\u884c .\/udpclient server_ip server_port \u542f\u52a8\u5ba2\u6237\u7aef
\nint main(int argc, char *argv[])
\n{
\n if (argc != 3)
\n {
\n std::cerr << "Usage: " << argv[0] << " server_ip server_port" << std::endl;
\n return 1;
\n }<\/p>\n

std::string server_ip = argv[1];
\n uint16_t server_port = std::stoi(argv[2]);<\/p>\n

\/\/ 1. \u521b\u5efa\u5957\u63a5\u5b57
\n int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
\n if (sockfd < 0)
\n {
\n std::cerr << "socket create error" << std::endl;
\n return 2;
\n }<\/p>\n

\/\/ 2. \u586b\u5145\u670d\u52a1\u7aef\u7684\u5957\u63a5\u5b57\u4fe1\u606f
\n struct sockaddr_in server;
\n memset(&server, 0, sizeof(server));
\n server.sin_family = AF_INET; \/\/ AF_INET \u6216\u8005 PF_INET
\n server.sin_port = htons(server_port);
\n server.sin_addr.s_addr = inet_addr(server_ip.c_str());<\/p>\n

\/\/ 3. \u5faa\u73af\u8bfb\u53d6\u5ba2\u6237\u7aef\u6d88\u606f
\n while(true)
\n {
\n \/\/ 3.1. \u7ed9\u5ba2\u6237\u7aef\u53d1\u5355\u8bcd
\n std::string input;
\n std::cout << "Please Enter# ";
\n std::getline(std::cin, input);
\n if (input.empty()) continue;
\n int n = sendto(sockfd, input.c_str(), input.size(), 0, (struct sockaddr*)&server, sizeof(server));
\n (void)n;<\/p>\n

\/\/ 3.2. \u663e\u793a\u7ffb\u8bd1\u540e\u7684\u4e2d\u6587
\n char buffer[1024];
\n struct sockaddr_in peer;
\n socklen_t len = sizeof(peer);
\n int m = recvfrom(sockfd, buffer, sizeof(buffer) – 1, 0, (struct sockaddr*)&peer, &len);
\n if (m > 0)
\n {
\n buffer[m] = 0;
\n std::cout << buffer << std::endl;
\n }
\n }
\n return 0;
\n}<\/p>\n","protected":false},"excerpt":{"rendered":"

\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb766\u6b21\uff0c\u70b9\u8d5e14\u6b21\uff0c\u6536\u85cf25\u6b21\u3002\u672c\u6587\u4ecb\u7ecd\u4e86\u5982\u4f55\u4f7f\u7528C++\u5b9e\u73b0\u4e00\u4e2a\u56de\u663e\u670d\u52a1\u5668\uff08Echo Server\uff09\u548c\u7ffb\u8bd1\u670d\u52a1\u5668\uff08Translation Server\uff09\u3002\u56de\u663e\u670d\u52a1\u5668\u7684\u529f\u80fd\u662f\u63a5\u6536\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6d88\u606f\u5e76\u5c06\u5176\u56de\u663e\u5230\u5ba2\u6237\u7aef\u663e\u793a\u5668\u4e0a\u3002\u6587\u7ae0\u9996\u5148\u4ecb\u7ecd\u4e86\u4e92\u65a5\u9501\u7684\u5c01\u88c5\u6a21\u5757\u548c\u7ebf\u7a0b\u5b89\u5168\u7684\u65e5\u5fd7\u6a21\u5757\uff0c\u63a5\u7740\u8be6\u7ec6\u8bb2\u89e3\u4e86UDP\u670d\u52a1\u7aef\u7684\u5c01\u88c5\uff0c\u5305\u62ecsocket()\u3001bind()\u3001recvfrom()\u3001sendto()\u7b49\u5173\u952e\u51fd\u6570\u7684\u7528\u6cd5\u3002\u6b64\u5916\uff0c\u6587\u7ae0\u8fd8\u63d0\u4f9b\u4e86\u670d\u52a1\u7aef\u548c\u5ba2\u6237\u7aef\u7684\u4ee3\u7801\u5b9e\u73b0\uff0c\u5e76\u6f14\u793a\u4e86\u672c\u5730\u548c\u8de8\u7f51\u7edc\u7684\u901a\u4fe1\u8fc7\u7a0b\u3002\u6700\u540e\uff0c\u6587\u7ae0\u4ecb\u7ecd\u4e86\u5982\u4f55\u5c06\u56de\u663e\u670d\u52a1\u5668\u6269\u5c55\u4e3a\u7ffb\u8bd1\u670d\u52a1\u5668\uff0c\u901a\u8fc7\u52a0\u8f7d\u5b57\u5178\u6587\u4ef6\u5b9e\u73b0<\/p>\n","protected":false},"author":2,"featured_media":38258,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[58,193,78],"topic":[],"class_list":["post-38268","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-linux","tag-udp","tag-78"],"yoast_head":"\nLinux \u7684 UDP \u7f51\u7edc\u7f16\u7a0b - 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