Day2(网络编程)

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Day2(网络编程)

搭建TCP服务端和客户端：

服务端代码：

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>#define ERR_MSG(msg) do{\fprintf(stderr, "line : __%d__\n", __LINE__);\perror(msg);\return -1;\
}while(0)#define PORT 8888
#define IP "192.168.31.72"int main(int argc, const char *argv[])
{//创建套接字int sfd = socket(AF_INET, SOCK_STREAM, 0);if(sfd < 0){ERR_MSG("socket");}printf("创建成功 sfd = %d\n", sfd);//填充结构体struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(PORT);sin.sin_addr.s_addr = inet_addr(IP);//绑定if(bind(sfd, (struct sockaddr*)&sin, sizeof(sin)) < 0){ERR_MSG("bind")	;	}printf("bind sucess __%d__\n", __LINE__);//设为被动监听if(listen(sfd, 128) < 0){ERR_MSG("listen");}printf("listen sucess __%d__\n", __LINE__);//存储发送消息客户端的信息struct sockaddr_in cin;socklen_t addrlen = sizeof(cin);//获取连接成功后的套接字int newfd = accept(sfd, (struct sockaddr*)&cin, &addrlen);if(newfd < 0){ERR_MSG("accept");}printf("[%s | %d]连接成功 newfd = %d\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), newfd);char buf[128] = "";ssize_t res = -1;while(1){//接收客户端消息res = recv(newfd, buf, sizeof(buf), 0);if(res == -1){ERR_MSG("recv");}else if(0 == res){printf("客户端断开连接\n");break;}printf("接收信息：%s\n", buf);//发送消息给客户端strcat(buf, "---mwt");if(-1 == send(newfd, buf, sizeof(buf), 0)){ERR_MSG("send");}printf("发送成功\n");}//关闭所有套接字close(newfd);close(sfd);return 0;
}

客户端代码：

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <string.h>
#include <arpa/inet.h>
#include <unistd.h>#define ERR_MSG(msg) do{\fprintf(stderr, "line : __%d__\n", __LINE__);\perror(msg);\return -1;\
}while(0)#define PORT 8888
#define IP "192.168.31.72"int main(int argc, const char *argv[])
{//创建套接字int sfd = socket(AF_INET, SOCK_STREAM, 0);if(sfd < 0){ERR_MSG("socket");}printf("创建成功 sfd = %d\n", sfd);//填充结构体struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(PORT);sin.sin_addr.s_addr = inet_addr(IP);//绑定,可以绑定也可不绑定，一般选择不绑定和不需要设置被动监听状态//不需要accept//连接服务器if(-1 == connect(sfd, (struct sockaddr*)&sin, sizeof(sin))){ERR_MSG("connect");}printf("与服务器连接成功\n");char buf[128] = "";ssize_t res = -1;while(1){bzero(buf, sizeof(buf));fgets(buf, sizeof(buf), stdin);buf[strlen(buf)-1] = '\0';//发送消息给客户端if(-1 == send(sfd, buf, sizeof(buf), 0)){ERR_MSG("send");}printf("发送成功\n");//接收客户端消息bzero(buf, sizeof(buf));res = recv(sfd, buf, sizeof(buf), 0);if(res == -1){ERR_MSG("recv");}else if(0 == res){printf("客户端断开连接\n");break;}printf("接收信息：%s\n", buf);if(!strcmp(buf, "quit---mwt"))break;}//关闭所有套接字close(sfd);return 0;
}

服务端：

ubuntu@ubuntu:homework$ ./ser
创建成功 sfd = 3
bind sucess __40__
listen sucess __47__
[192.168.31.72 | 47168]连接成功 newfd = 4
接收信息：你好
发送成功
接收信息：拜拜
发送成功
接收信息：quit
发送成功
客户端断开连接

用户端：

ubuntu@ubuntu:homework$ ./cli 
创建成功 sfd = 3
与服务器连接成功
你好
发送成功
接收信息：你好---mwt
拜拜
发送成功
接收信息：拜拜---mwt
quit 
发送成功
接收信息：quit---mwt

搭建UDP服务端和客户端

服务端：

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>#define ERR_MSG(msg) do{\fprintf(stderr, "line : __%d__\n", __LINE__);\perror(msg);\return-1;\
}while(0)#define PORT 8888
#define IP "192.168.31.72"int main(int argc, const char *argv[])
{//创建套接字int sfd = socket(AF_INET, SOCK_DGRAM, 0);if(sfd < 0){ERR_MSG("socket");}printf("套接字创建成功 sfd = %d\n", sfd);//填充结构体struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(PORT);sin.sin_addr.s_addr = inet_addr(IP);//创建保存信息的结构体struct sockaddr_in cin;socklen_t addrlen = sizeof(cin);//绑定if(-1 == bind(sfd, (struct sockaddr *)&sin, sizeof(sin))){ERR_MSG("bind");}printf("绑定成功\n");char buf[128] = "";ssize_t res = -1;while(1){bzero(buf, sizeof(buf));//接收信息res = recvfrom(sfd, buf, sizeof(buf), 0, (struct sockaddr *)&cin, &addrlen);if(-1 == res){ERR_MSG("recvfrom");}printf("[%s : %d] 接收消息为：%s \n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), buf);bzero(buf, sizeof(buf));//发送信息strcat(buf, "---mwt");if(-1 == sendto(sfd, buf, sizeof(buf), 0, (struct sockaddr *)&cin, addrlen)){ERR_MSG("sendto");}printf("发送成功\n");}//关闭套接字close(sfd);return 0;
}

客户端：

ubuntu@ubuntu:homework$ cat 04_UDPCli.c 
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>#define ERR_MSG(msg) do{\fprintf(stderr, "line : __%d__\n", __LINE__);\perror(msg);\return-1;\
}while(0)#define PORT 8888
#define IP "192.168.31.72"int main(int argc, const char *argv[])
{//创建套接字int sfd = socket(AF_INET, SOCK_DGRAM, 0);if(sfd < 0){ERR_MSG("socket");}printf("套接字创建成功 sfd = %d\n", sfd);//填充结构体//明确知道是从服务端发送的，不需要在保存,可绑定可不绑定，一般不需要struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(PORT);sin.sin_addr.s_addr = inet_addr(IP);socklen_t addrlen = sizeof(sin);char buf[128] = "";ssize_t res = -1;while(1){bzero(buf, sizeof(buf));//发送信息fgets(buf, sizeof(buf), stdin);buf[strlen(buf)-1] = '\0';if(-1 == sendto(sfd, buf, sizeof(buf), 0, (struct sockaddr *)&sin, sizeof(sin))){ERR_MSG("sendto");}printf("发送成功\n");//接收信息res = recvfrom(sfd, buf, sizeof(buf), 0, (struct sockaddr *)&sin, &addrlen);if(-1 == res){ERR_MSG("recvfrom");}printf("[%s : %d] 接收消息为：%s \n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), buf);}//关闭套接字close(sfd);return 0;
}

客户端输出结果：

ubuntu@ubuntu:homework$ ./cli 
套接字创建成功 sfd = 3
da
发送成功
[192.168.31.72 : 8888] 接收消息为：da---mwt 
nihao
发送成功
[192.168.31.72 : 8888] 接收消息为：nihao---mwt 
baibai
发送成功
[192.168.31.72 : 8888] 接收消息为：baibai---mwt 

服务端输出结果：

ubuntu@ubuntu:homework$ ./ser 
套接字创建成功 sfd = 3
绑定成功
[192.168.31.72 : 50076] 接收消息为：da 
发送成功
[192.168.31.72 : 50076] 接收消息为：nihao 
发送成功
[192.168.31.72 : 50076] 接收消息为：baibai 
发送成功