linux环境下搭建一个基于tcp的客户端和服务器

客户端

//TCP 客户端代码#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h>#include <arpa/inet.h>#include <string.h>#include <unistd.h>#include <netinet/in.h>#include <fcntl.h>#define MAXLINE4096#define SERVER_PORT8000/* 这里的多有函数没有作出错判断 */int main(int argc, char *argv[]){struct sockaddr_in serveraddr;int confd, len;char ipstr[] = "192.168.1.253";char buf[MAXLINE];if(argc < 2) {printf("./client str\n");exit(1);}//1.创建一个socketconfd = socket(AF_INET, SOCK_STREAM, 0);//2.初始化服务器地址bzero(&serveraddr, sizeof(serveraddr));serveraddr.sin_family = AF_INET;//"192.168.1.253"inet_pton(AF_INET, ipstr, &serveraddr.sin_addr.s_addr);serveraddr.sin_port = htons(SERVER_PORT);//3.链接服务器connect(confd, (struct sockaddr *)&serveraddr, sizeof(serveraddr));//4.请求服务器处理数据write(confd, argv[1], strlen(argv[1]));len = read(confd, buf, sizeof(buf));write(STDOUT_FILENO, buf, len);//5.关闭socketclose(confd);return 0;}

服务器

#include <stdio.h>#include <string.h>#include <sys/types.h>#include <sys/socket.h>#include <arpa/inet.h>#include <unistd.h>#include <ctype.h>#include <netinet/in.h>#define SERVER_PORT8000#define MAXLINE4096int main(void){struct sockaddr_in serveraddr, clientaddr;int sockfd, addrlen, confd, len, i;char ipstr[128];char buf[MAXLINE];//1.socketsockfd = socket(AF_INET, SOCK_STREAM, 0); <span style="white-space:pre"></span>//参数含义 IPV4,默认TCP//暂时不做出错检测//2. bindbzero(&serveraddr, sizeof(serveraddr));<span style="white-space:pre"></span>//绑定之前服务器地址清零serveraddr.sin_family = AF_INET; <span style="white-space:pre"></span>/* 地址族协议 IPV4 */serveraddr.sin_addr.s_addr = htonl(INADDR_ANY)<span style="white-space:pre"></span>// IP地址 主机字节序转成网络字节序serveraddr.sin_port = htons(SERVER_PORT);<span style="white-space:pre"></span>//端口号转换bind(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr));<span style="white-space:pre"></span>//将SOCKET描述符绑定到服务器地址//3. listenlisten(sockfd, 128);while (1) {//4. accept 阻塞监听客户端连接器请求addrlen = sizeof(clientaddr);confd = accept(sockfd, (struct sockaddr *)&clientaddr, &addrlen);<span style="white-space:pre"></span>//调用成功传回SOCKET描述符，/* 输出客户端IP地址和端口号 */inet_ntop(AF_INET, &clientaddr.sin_addr.s_addr, ipstr, sizeof(ipstr));printf("client ip %s\tport %d\n",inet_ntop(AF_INET,&clientaddr.sin_addr.s_addr, ipstr, sizeof(ipstr)), ntohs(clientaddr.sin_port));//客户端交互数据操作 confd//5. 处理客户端请求len = read(confd, buf, sizeof(buf[i]));i = 0;while (i < len) {buf[i] = toupper(buf[i]);i++;}write(confd, buf, len); close(confd); }close(sockfd);return 0;}