linux下简单的服务器与客户端实现代码 linux下简单的服务器与客户端实

实现目标：客户端发送一段数据，服务器回显，服务器显示客户端ip地址
服务器代码：
/***************************************************************

File Name: test.c
Author: kinght
Mail: zhjnight@163.com
Created Time: Wed 20 Jun 2018 06:58:02 PM PDT
**************************************************************/

#include #include//connect,send,recv,setsockopt等 #include#include // sockaddr_in, "man 7 ip" ,htons #include //poll,pollfd #include//inet_addr,inet_aton #include //read,write #include //gethostbyname#include //perror #include #include //errno#include// memset #include #include #include #ifdef HAVE_NETINET_IN_H #include #endif#define ERR_EXIT(m)\ do\ {\ perror(m); \ exit(EXIT_FAILURE); \ }while(0)int main(void) { int listenfd; if((listenfd =socket(PF_INET,SOCK_STREAM,IPPROTO_TCP))<0) { ERR_EXIT("ERROR"); } struct sockaddr_in servaddr; memset(&servaddr,0,sizeof(servaddr)); servaddr.sin_family=AF_INET; servaddr.sin_port = htons(5188); servaddr.sin_addr.s_addr = htonl(INADDR_ANY); int on = 1; if(setsockopt(listenfd,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on))< 0) { ERR_EXIT("SETSOCKOPT"); } if(bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr))< 0) { ERR_EXIT("error"); } if(listen(listenfd,SOMAXCONN)<0) { ERR_EXIT("listen"); } struct sockaddr_in peeraddr; socklen_t peerlen = sizeof(peeraddr); int conn; conn = accept(listenfd,(struct sockaddr*)&peeraddr,&peerlen); if(conn < 0) { ERR_EXIT("accept"); } printf("ip= %s,port = %d\n",inet_ntoa(peeraddr.sin_addr),ntohs(peeraddr.sin_port)); char recvbuf[1024]; while(true) { memset(recvbuf,0,sizeof(recvbuf)); int ret = read(conn,recvbuf,sizeof(recvbuf)); if(ret < 0) continue; write(conn,recvbuf,ret); printf(recvbuf,stdout); } close(conn); close(listenfd); return 0; }

客户端实现代码

/************************************************************************* > File Name: client.c > Author: kinght > Mail: zhjnight@163.com > Created Time: Wed 20 Jun 2018 06:58:02 PM PDT ************************************************************************/#include #include//connect,send,recv,setsockopt等 #include#include // sockaddr_in, "man 7 ip" ,htons #include //poll,pollfd #include//inet_addr,inet_aton #include //read,write #include //gethostbyname#include //perror #include #include //errno#include// memset #include #include #include #ifdef HAVE_NETINET_IN_H #include #endif#define ERR_EXIT(m)\ do\ {\ perror(m); \ exit(EXIT_FAILURE); \ }while(0)int main(void) { int sock; if((sock =socket(PF_INET,SOCK_STREAM,IPPROTO_TCP))<0) { ERR_EXIT("ERROR"); } struct sockaddr_in servaddr; memset(&servaddr,0,sizeof(servaddr)); servaddr.sin_family=AF_INET; servaddr.sin_port = htons(5188); servaddr.sin_addr.s_addr = inet_addr("127.0.0.1"); if(connect(sock,(struct sockaddr*)&servaddr,sizeof(servaddr))< 0) { ERR_EXIT("connect"); } char sendbuf[1024]={0}; char recvbuf[1024]={0}; while(fgets(sendbuf,sizeof(sendbuf),stdin)!=NULL) { write(sock,sendbuf,strlen(sendbuf)); read(sock,recvbuf,sizeof(recvbuf)); fputs(recvbuf,stdout); memset(sendbuf,0,sizeof(sendbuf)); memset(recvbuf,0,sizeof(recvbuf)); } close(sock); return 0; }

【linux下简单的服务器与客户端实现代码】实现结果：