2024.3.4-编程知识

思维导图

作业1：广播

发送端：

#include<myhead.h>
int main(int argc, const char *argv[])
{//创建套接字int sfd = socket(AF_INET,SOCK_DGRAM,0);if(sfd == -1){perror("sockeet error");return -1;}//设置当前套接字允许广播属性int broadcast = 1;if(setsockopt(sfd,SOL_SOCKET,SO_BROADCAST,&broadcast,sizeof(broadcast)) == -1){perror("setsockopt error");return -1;}//绑定（可选）//填充接收端地址信息结构体struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(8888);sin.sin_addr.s_addr = inet_addr("192.168.244.255");//发送数据char sbuf[128] = "";while(1){printf("请输入>>");fgets(sbuf,sizeof(sbuf),stdin);sbuf[strlen(sbuf)-1] = 0;sendto(sfd,sbuf,strlen(sbuf),0,(struct sockaddr*)&sin,sizeof(sin));printf("发送成功\n");}//关闭close(sfd);return 0;
}

接收端：

#include<myhead.h>
int main(int argc, const char *argv[])
{//创建套接字int rfd = socket(AF_INET,SOCK_DGRAM,0);if(rfd == -1){perror("socket error");return -1;}printf("rfd = %d\n",rfd);//填充地址信息结构体struct sockaddr_in rin;rin.sin_family = AF_INET;rin.sin_port = htons(8888);rin.sin_addr.s_addr = inet_addr("192.168.244.255");//绑定if(bind(rfd,(struct sockaddr*)&rin,sizeof(rin)) == -1){perror("bind error");return -1;}//接收广播消息char rbuf[128] ="";while(1){//清空消息bzero(rbuf,sizeof(rbuf));//读取消息recv(rfd,rbuf,sizeof(rbuf),0);printf("收到消息：%s\n",rbuf);}//关闭套接字close(rfd);return 0;
}

作业2：组播

发送端：

#include<myhead.h>
int main(int argc, const char *argv[])
{//创建套接字int rfd = socket(AF_INET,SOCK_DGRAM,0);if(rfd == -1){perror("socket error");return -1;}//绑定端口号和ip地址//填充地址信息结构体struct sockaddr_in rin;rin.sin_family = AF_INET;rin.sin_port = htons(9999);rin.sin_addr.s_addr = inet_addr("192.168.244.140");//绑定端口号和IPif(bind(rfd,(struct sockaddr*)&rin,sizeof(rin)) == -1){perror("bind error");return -1;}//发送消息//填充接收端地址信息结构体struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(8888);sin.sin_addr.s_addr = inet_addr("224.1.2.3");char sbuf[128] = "";while(1){printf("请输入>>");fgets(sbuf,sizeof(sbuf),stdin);sbuf[strlen(sbuf)-1] = 0;//向组播地址中发送信息sendto(rfd,sbuf,strlen(sbuf),0,(struct sockaddr*)&sin,sizeof(sin));printf("发送成功\n");}return 0;
}

接收端：

#include<myhead.h>
int main(int argc, const char *argv[])
{//创建套接字int rfd = socket(AF_INET,SOCK_DGRAM,0);if(rfd == -1){perror("socket error");return -1;}printf("rfd = %d\n",rfd);//设置加入多播组struct ip_mreqn imr;imr.imr_multiaddr.s_addr = inet_addr("224.1.2.3");   //组播ipimr.imr_address.s_addr = inet_addr("192.168.244.140");   //本地ipimr.imr_ifindex = 2;        //网卡编号if(setsockopt(rfd,IPPROTO_IP,IP_ADD_MEMBERSHIP,&imr,sizeof(imr)) == -1){perror("setsockopt error");return -1;}//填充地址信息结构体struct sockaddr_in rin;rin.sin_family = AF_INET;rin.sin_port = htons(8888);rin.sin_addr.s_addr = inet_addr("224.1.2.3");//绑定if(bind(rfd,(struct sockaddr*)&rin,sizeof(rin)) == -1){perror("bind error");return -1;}//接收组播消息char rbuf[128] ="";while(1){//清空消息bzero(rbuf,sizeof(rbuf));//读取消息recv(rfd,rbuf,sizeof(rbuf),0);printf("收到消息：%s\n",rbuf);}//关闭套接字close(rfd);return 0;
}

作业3：流式域套接字

TCP服务器端：

#include<myhead.h>
int main(int argc, const char *argv[])
{//创建套接字int sfd = socket(AF_UNIX,SOCK_STREAM,0);if(sfd == -1){perror("socket error");return -1;}//判断套接字文件是否存在，如果存在需要删除if(access("./mysocket",F_OK) == 0);{//说明存在，将该文件删除if(unlink("./mysocket") == -1){perror("unlink error");return -1;}}//绑定套接字文件//填充地址信息结构体struct sockaddr_un sun;sun.sun_family = AF_UNIX;               //地址族strcpy(sun.sun_path , "./mysocket");    //套接字文件//绑定 if(bind(sfd , (struct sockaddr*)&sun , sizeof(sun)) == -1){perror("bind error");return -1;}printf("bind success\n");//监听if(listen(sfd,128) == -1){perror("listen error");return -1;}printf("listen success\n");//阻塞等待客户端连接请求//定义容器接收客户端地址信息struct sockaddr_un cun;socklen_t socklen = sizeof(cun);int newfd = -1;if((newfd = accept(sfd,(struct sockaddr*)&cun,&socklen))==-1){perror("accept error");return -1;}printf("有新客户发来链接请求\n");//数据收发char rbuf[128]="";while(1){//清空bzero(rbuf,sizeof(rbuf));//收取数据recv(newfd,rbuf,sizeof(rbuf),0);printf("[%s]：%s\n",cun.sun_path,rbuf);//链接一个笑脸回复strcat(rbuf,"*_*");//发送回去send(newfd,rbuf,strlen(rbuf),0);printf("发送成功\n");}//关闭套接字close(sfd);close(newfd);return 0;
}

客户端：

#include<myhead.h>
int main(int argc, const char *argv[])
{//1.创建用于通信的套接字文件描述符int cfd = socket(AF_UNIX,SOCK_STREAM,0);if(cfd == -1){perror("socket error");return -1;}printf("cfd = %d\n",cfd);//判断套接字文件是否存在，如果存在则需要删除if(access("./mysocket1",F_OK) == 0){//说明存在，将该文件删除if(unlink ("./mysocket1") == -1){perror("unlink error");return -1;}}//2.绑定（非必须）//填充地址信息结构体struct sockaddr_un cun;cun.sun_family = AF_UNIX;strcpy(cun.sun_path,"./mysocket1");//绑定if(bind(cfd,(struct sockaddr*)&cun , sizeof(cun)) == -1){perror("bind error");return -1;}//3.连接服务器//3.1填充要连接的服务器地址信息结构体struct sockaddr_un sun;sun.sun_family = AF_UNIX;               //地址族strcpy(sun.sun_path,"./mysocket");      //套接字文件//3.2连接服务器if(connect(cfd ,(struct sockaddr*)&sun,sizeof(sun)) == -1){perror("connect error");return -1;}printf("connect success\n");//4.数据收发char wbuf[128] ="";while(1){//清空数据bzero(wbuf,sizeof(wbuf));printf("请输入>>");fgets(wbuf,sizeof(wbuf),stdin);     //从终端输入wbuf[strlen(wbuf)-1] = 0;//将数据发送给服务器send(cfd , wbuf , strlen(wbuf) , 0);printf("发送成功\n");//判断发送的数据if(strcmp(wbuf,"quit") == 0){break;}//接受服务器发来的信息//清空数据bzero(wbuf,sizeof(wbuf));recv(cfd , wbuf , sizeof(wbuf), 0);printf("收到信息为：%s\n",wbuf);}//5.关闭套接字close(cfd);return 0;
}

作业4：报式域套接字

服务器端：

#include<myhead.h>int main(int argc, const char *argv[])
{//创建用于通信的套接字int sfd = socket(AF_UNIX,SOCK_DGRAM,0);if(sfd == -1){perror("socket error");return -1;}printf("sfd = %d\n",sfd);//判断套接字文件是否存在，如果存在则需要删除if(access("./linux1",F_OK) == 0){//说明文件存在，将该文件删除if(unlink("./linux1") == -1){perror("unlink error");return -1;}}//绑定IP地址和端口号//填充地址信息结构体struct sockaddr_un sun;sun.sun_family = AF_UNIX;          //地址族strcpy(sun.sun_path,"./linux1");//绑定if(bind(sfd,(struct sockaddr*)&sun,sizeof(sun)) == -1){perror("bind error");return -1;}printf("bind success\n");//收发数据char rbuf[128] = "";//定义容器接受对端地址信息结构体struct sockaddr_un cun;socklen_t socklen = sizeof(cun);while(1){//清空数组bzero(rbuf , sizeof(rbuf));//接收数据recvfrom(sfd,rbuf,sizeof(rbuf),0,(struct sockaddr*)&cun,&socklen);printf("收到信息为：%s\n",rbuf);//将消息加“*_*”返回strcat(rbuf,"*_*");if(sendto(sfd,rbuf,strlen(rbuf),0,(struct sockaddr*)&cun,socklen) == -1){perror("sendto error");return -1;}}//关闭套接字close(sfd);return 0;
}

客户端：

#include<myhead.h>int main(int argc, const char *argv[])
{//创建用于通信的套接字int cfd = socket(AF_UNIX,SOCK_DGRAM,0);if(cfd == -1){perror("socket error");return -1;}printf("cfd = %d\n",cfd);//判断套接字文件是否存在，如果存在需要删除if(access("./linux2",F_OK) == 0){//说明存在，将该文件删除if(unlink("./linux2") == -1){perror("unlink error");return -1;}}//绑定IP地址和端口号(非必要)struct sockaddr_un cun;cun.sun_family = AF_UNIX;strcpy(cun.sun_path,"./linux2");if(bind(cfd,(struct sockaddr*)&cun,sizeof(cun)) == -1){perror("bind error");return -1;}//收发数据char wbuf[128] = "";//定义容器,记录服务器地址信息结构体struct sockaddr_un sun;sun.sun_family = AF_UNIX;strcpy(sun.sun_path,"./linux1");while(1){//清空数组bzero(wbuf , sizeof(wbuf));//从终端获取数据printf("请输入：");fgets(wbuf,sizeof(wbuf),stdin);wbuf[strlen(wbuf)-1] = 0;//将数据发送给服务器sendto(cfd,wbuf,sizeof(wbuf),0,(struct sockaddr*)&sun,sizeof(sun));printf("发送成功\n");//接收服务器回复的消息bzero(wbuf , sizeof(wbuf));}//关闭套接字close(cfd);return 0;
}