网络编程 DAY1:-优快云博客

本文链接：https://blog.youkuaiyun.com/zero2all/article/details/131099435

代码示例展示了TCP服务器和客户端以及UDP服务器和客户端的实现。TCP服务器监听并接受连接，接收和发送数据；TCP客户端建立连接，发送和接收数据。UDP服务器接收来自客户端的数据并回应，UDP客户发送数据并接收响应。

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TCP服务器：

#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/msg.h>
#include<stdio.h>
#include<sys/ipc.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#define PORT 6666
#define IP "192.168.2.144"
#define ERR_MSG(msg) do{\
   fprintf(stderr,"line:%d: %s %s",__LINE__,__FILE__,__func__);\
   perror(msg);\
}while(0)
int main()
{
   //创建套接字
   int soketfd=socket(AF_INET,SOCK_STREAM,0);
   if(soketfd<0)
   {
       ERR_MSG("socket");
       return -1;
   }
   struct sockaddr_in myaddr;
   myaddr.sin_family=AF_INET;
   myaddr.sin_port=htons(PORT);
   myaddr.sin_addr.s_addr=inet_addr(IP);
   //绑定端口与套字节
   if(bind(soketfd,(struct sockaddr *)&myaddr,sizeof(myaddr))<0)
   {
       ERR_MSG("bind");
       return -1;
   }
   printf("bind success __%d__\n",__LINE__);
   //监听
   if(listen(soketfd,128)<0)
   {
       ERR_MSG("listen");
       return -1;
   }
   printf("listen success __%d__\n",__LINE__);
   struct sockaddr_in cin;
   socklen_t addrlen=sizeof(cin);
   int newfd=accept(soketfd,(struct sockaddr *)&cin,&addrlen);
   if(newfd<0)
   {
       ERR_MSG("accept");
       return -1;
   }
   printf("客户机链接成功 newfd=%d __%d__\n",newfd,__LINE__);
   char buf[128]="";
   ssize_t res=0;
   while(1)
   {
       bzero(buf,sizeof(buf));
       res=recv(newfd,buf,sizeof(buf),0);
       if(res<0)
       {
           ERR_MSG("rev");
           return -1;
       }
       else if(0==res)
       {
           printf("客户端下线newfd=%d __%d__\n",newfd,__LINE__);
           break;
       }
       printf("newfd=%d:%s\n",newfd,buf);

       bzero(buf,sizeof(buf));
       fgets(buf,sizeof(buf),stdin);
       buf[sizeof(buf)-1]=0;
       if(send(newfd,buf,sizeof(buf),0)<0)
       {
           ERR_MSG("send");
           return -1;
       }
       printf("send accecc __%d__",__LINE__);
   }
   close(newfd);
   close(soketfd);
   return 0;
}

TCP客户端：

   char buf[128]="";
   ssize_t res=0;
   while(1)
   {
       bzero(buf,sizeof(buf));
       fgets(buf,sizeof(buf),stdin);
       buf[strlen(buf)-1]=0;
       if(send(soketfd,buf,sizeof(buf),0)<0)
       {
           ERR_MSG("send");
           return -1;
       }
       printf("send success __%d__\n",__LINE__);

       bzero(buf,sizeof(buf));
       res=recv(soketfd,buf,sizeof(buf),0);
       if(res<0)
       {
           ERR_MSG("recv");
           return -1;
       }
       else if(0==res)
       {
           printf("服务器下线__%d__\n",__LINE__);
           break;
       }
       printf("%s__%d__\n",buf,__LINE__);
   }
   close(soketfd);
   return 0;
}

UDP服务器：

#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/msg.h>
#include<stdio.h>
#include<sys/ipc.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#define PORT 6666
#define IP "192.168.2.144"
#define ERR_MSG(msg) do{\
   fprintf(stderr,"line:%d: %s %s",__LINE__,__FILE__,__func__);\
   perror(msg);\
}while(0)
int main()
{
   //创建套接字
   int soketfd=socket(AF_INET,SOCK_DGRAM,0);
   if(soketfd<0)
   {
       ERR_MSG("socket");
       return -1;
   }
   struct sockaddr_in myaddr;
   myaddr.sin_family=AF_INET;
   myaddr.sin_port=htons(PORT);
   myaddr.sin_addr.s_addr=inet_addr(IP);
   //绑定端口与套字节
   if(bind(soketfd,(struct sockaddr *)&myaddr,sizeof(myaddr))<0)
   {
       ERR_MSG("bind");
       return -1;
   }
   printf("bind success __%d__\n",__LINE__);

   char buf[128]="";
   struct sockaddr_in cin;
   socklen_t addrlen=sizeof(cin);
   while(1)
   {
       bzero(buf,sizeof(buf));
       if(recvfrom(soketfd,buf,sizeof(buf),0,(struct sockaddr *)&cin,&addrlen)<0)
       {
           ERR_MSG("recv");
           return -1;
       }
       printf("[%s:%d]:%s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),buf);

       bzero(buf,sizeof(buf));
       fgets(buf,sizeof(buf),stdin);
       if(sendto(soketfd,buf,sizeof(buf),0,(struct sockaddr *)&cin,sizeof(cin))<0)
       {
           ERR_MSG("send");
           return -1;
       }
       printf("send success __%d__\n",__LINE__);
   }
   close(soketfd);
   return 0;
}

UDP客户：

       if(recvfrom(soketfd,buf,sizeof(buf),0,(struct sockaddr *)&myaddr,&addrlen)<0)
       {
           ERR_MSG("recv");
           return -1;
       }
       printf("[%s:%d]:%s\n",inet_ntoa(myaddr.sin_addr),ntohs(myaddr.sin_port),buf);

   }
   close(soketfd);
   return 0;
}