1228作业

思维导图

作业

TCP的cs模型
服务器

//服务器
#include <myhead.h>
#define PORT 6667
#define IP "192.168.124.94"
#define BACKLOG 128
int main(int argc, const char *argv[])
{//创建套接字int oldfd = socket(AF_INET,SOCK_STREAM,0);if(oldfd==-1){perror("socket");return -1;}//将套接字与本地IP绑定在一起struct sockaddr_in s;s.sin_family = AF_INET;s.sin_port = htons(PORT);s.sin_addr.s_addr = inet_addr(IP);if((bind(oldfd,(struct sockaddr *)&s,sizeof(s))==-1)){perror("bind");return -1;}//监听if(listen(oldfd,BACKLOG)==-1){perror("listen");return -1;}//接受连接请求，并记录连接者的信息struct sockaddr_in c;int len = sizeof(c);int newfd = accept(oldfd,(struct sockaddr *)&c,&len);if(newfd==-1){perror("accept");return -1;}printf("与%s:%d建立连接\n",inet_ntoa(c.sin_addr),ntohs(c.sin_port));//读写消息char buff[1024];while(1){int res = read(newfd,buff,sizeof(buff));printf("%s\n",buff);strcat(buff,"你好啊");write(newfd,buff,res);}return 0;
}

客户端

//客户端
#include <myhead.h>
#define PORT 6666
#define IP "192.168.124.94"
int main(int argc, const char *argv[])
{//创建套接字int oldfd = socket(AF_INET,SOCK_STREAM,0);if(oldfd==-1){perror("socket");return -1;}//向客户端发送连接消息，并带上自己的信息struct sockaddr_in k;k.sin_family = AF_INET;k.sin_port = htons(PORT);k.sin_addr.s_addr = inet_addr(IP);if((connect(oldfd,(struct sockaddr *)&k,sizeof(k)))==1){perror("connect");return -1;}//读写消息char buff[1024];while(1){printf("请输入信息：\n");//int res =read(0,buff,sizeof(buff));fgets(buff,sizeof(buff),stdin);write(oldfd,buff,sizeof(buff));printf("发送成功\n");//read(oldfd,buff,sizeof(buff));//printf("接收到消息:%s\n",buff);//bzero(buff,sizeof(buff));}return 0;
}

UDP服务器中，使用connect函数实现唯一的客户端与唯一的服务器通讯
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服务器

//服务器
#include <myhead.h>
#define PORT 8765
#define IP "192.168.124.94"
int main(int argc, const char *argv[])
{//创建套接字int oldfd = socket(AF_INET,SOCK_DGRAM,0);if(oldfd==-1){perror("socket");return -1;}//绑定struct sockaddr_in server = {.sin_family = AF_INET,.sin_port = htons(PORT),.sin_addr.s_addr = inet_addr(IP)};if(bind(oldfd,(struct sockaddr *)&server,sizeof(server))==-1){perror("bind");return -1;}#if 1//收发消息struct sockaddr_in client;//存储发来信息的客户端的信息int len = sizeof(client);char buff[1024];int flag=0;while(1){recvfrom(oldfd,buff,sizeof(buff),0,(struct sockaddr *)&client,&len);buff[strlen(buff)]='\0';if(strcmp(buff,"quit")==0){flag=1;printf("连接已经断开\n");}else{printf("已建立唯一连接\n");}printf("收到%s:%d的消息:%s\n",inet_ntoa(client.sin_addr),ntohs(client.sin_port),buff);//与该客户端进行连接while(flag){recvfrom(oldfd,buff,sizeof(buff),0,(struct sockaddr *)&client,&len);if(connect(oldfd,(struct sockaddr *)&client,len)==-1){perror("connect");return -1;}printf("再次连接新的客户端\n");printf("收到%s:%d的消息:%s\n",inet_ntoa(client.sin_addr),ntohs(client.sin_port),buff);flag=0;}strcat(buff,"世界美好");sendto(oldfd,buff,sizeof(buff),0,(struct sockaddr *)&client,sizeof(client));}
#endifreturn 0;
}

客户端

//客户端
#include <myhead.h>
#define PORT 8765
#define IP "192.168.124.94"
int main(int argc, const char *argv[])
{//创建套接字int oldfd = socket(AF_INET,SOCK_DGRAM,0);if(oldfd==-1){perror("socket");return -1;}#if 1//收发消息struct sockaddr_in server = {.sin_family = AF_INET,.sin_port = htons(PORT),.sin_addr.s_addr = inet_addr(IP)};char buff[1024];while(1){printf("请输入发送的消息:\n");fgets(buff,sizeof(buff),stdin);buff[strlen(buff)-1]='\0';sendto(oldfd,buff,sizeof(buff),0,(struct sockaddr *)&server,sizeof(server));if(strcmp(buff,"quit")==0){break;}bzero(buff,sizeof(buff));recvfrom(oldfd,buff,sizeof(buff),0,NULL,NULL);printf("接收服务器信息：%s\n",buff);}
#endifreturn 0;
}