log.hpp
cpp
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#pragma once
#include <iostream>
#include <string>
#include <cstdarg>
#include <cstdio>
#include <ctime>
#define DEBUG 0
#define NORMAL 1
#define WARNING 2
#define ERROR 3
#define FATAL 4
const char *gLevelMap[5] = {"DEBUG", "NORMAL", "WARNING", "ERROR", "FATAL"};
#define LOGFILE "./threadpool.log"
void logMessage(int level, const char *format, ...)
{
char stdBuffer[1024]; // 标准部分
time_t timestamp = time(nullptr);
struct tm *time = localtime(×tamp);
snprintf(stdBuffer, sizeof stdBuffer, "[%s][%ld]", gLevelMap[level], timestamp);
char logBuffer[64]; // 自定义部分
va_list args;
va_start(args, format);
vsnprintf(logBuffer, sizeof(logBuffer), format, args); // 使用 vsnprintf 而不是 vsprintf
va_end(args);
// FILE* fp=fopen(LOGFILE,"a");
// 打印到显示器
printf("%s %s\n", stdBuffer, logBuffer);
// 打印到指定文件
// fprintf(fp,"%s%s\n",stdBuffer,logBuffer);
// fclose(fp);
}
Makefile
cpp
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.PHONY:all
all:udp_client udp_server
udp_client:udp_client.cc
g++ -o $@ $^ -std=c++11
udp_server:udp_server.cc
g++ -o $@ $^ -std=c++11
.PHONY:clean
clean:
rm -f udp_client udp_server
udp_client.cc
cpp
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#include <iostream>
#include <string>
#include <sys/types.h>
#include <sys/socket.h>
#include "log.hpp"
#include <arpa/inet.h>
#include <netinet/in.h>
#include <string.h>
#include <unistd.h>
static void usage(std::string proc)
{
std::cout << "\nUsage: " << proc << " ip port" << std::endl;
}
int main(int argc, char *argv[])
{
if (argc != 3)
{
usage(argv[0]);
exit(1);
}
std::string ip = argv[1];
uint16_t port = atoi(argv[2]);
struct sockaddr_in server;
bzero(&server, sizeof server);
server.sin_addr.s_addr = inet_addr(ip.c_str());
server.sin_family = AF_INET;
server.sin_port = htons(port);
socklen_t len = sizeof server;
int sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0)
{
logMessage(FATAL, "client sock error: %d:%s", errno, strerror(errno));
exit(2);
}
std::string message;
char buffer[1024];
while (true)
{
std::cout << "请输入你的信息# ";
getline(std::cin, message);
if (message == "quit")
break;
sendto(sock, message.c_str(), message.size(), 0, (struct sockaddr *)&server, len);
struct sockaddr_in temp;
socklen_t len = sizeof(temp);
ssize_t s = recvfrom(sock, buffer, sizeof(buffer) - 1, 0, (struct sockaddr *)&temp, &len);
if (s > 0)
{
buffer[s] = 0;
std::cout << "server echo# " << buffer << std::endl;
}
}
close(sock);
return 0;
}
udp_server.cc
cpp
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#include "udp_server.hpp"
#include <memory>
static void usage(std::string proc)
{
std::cout << "\nUsage: " << proc << "port" << std::endl;
}
int main(int argc, char *argv[])
{
if (argc != 2)
{
usage(argv[0]);
exit(1);
}
uint16_t port = atoi(argv[1]);
std::unique_ptr<UdpServer> svr(new UdpServer(port));
svr->initServer();
svr->Start();
return 0;
}
udp_server.hpp
cpp
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#ifndef UDP_SERVER_HPP
#define UDP_SERVER_HPP
#include <iostream>
#include <string>
#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include "log.hpp"
#include <cerrno>
#include <string.h>
#include <cstdlib>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#define SIZE 1024
class UdpServer
{
public:
UdpServer(uint16_t port, std::string ip = "")
: _port(port), _ip(ip), _sock(-1)
{
}
bool initServer()
{
// 从这里开始,就是新的系统调用
// 1.创建套接字
_sock = socket(AF_INET, SOCK_DGRAM, 0);
if (_sock < 0)
{
logMessage(FATAL, "%d:%s", errno, strerror(errno));
exit(2);
}
// 2.bind绑定
struct sockaddr_in local;
bzero(&local, sizeof(local));
local.sin_family = AF_INET;
local.sin_addr.s_addr = _ip.empty() ? INADDR_ANY : inet_addr(_ip.c_str());
local.sin_port = htons(_port);
if (bind(_sock, (const sockaddr *)&local, sizeof(local)) < 0)
{
logMessage(FATAL, "%d:%s", errno, strerror(errno));
exit(3);
}
logMessage(NORMAL, "init udp server done ...%s", strerror(errno));
return true;
}
void Start()
{
char buffer[SIZE];
while (true)
{
struct sockaddr_in peer;
socklen_t len = sizeof peer;
bzero(&peer, sizeof peer);
ssize_t s = recvfrom(_sock, buffer, sizeof(buffer) - 1, 0, (struct sockaddr *)&peer, &len);
if (s > 0)
{
buffer[s] = 0;
// 输出发送的数据信息
// 是谁?
uint16_t cli_port = ntohs(peer.sin_port);
std::string cli_ip = inet_ntoa(peer.sin_addr);
std::cout << "ip: " << cli_ip << " | " << "端口号" << cli_port << "接收到的信息:" << buffer << std::endl;
}
sendto(_sock, buffer, strlen(buffer), 0, (struct sockaddr *)&peer, len);
}
}
~UdpServer()
{
if (_sock >= 0)
close(_sock);
}
private:
// 一个服务器,一般需要ip地址和port
std::string _ip;
uint16_t _port;
int _sock;
};
#endif