Linux/Unix下Socket编程
演示linux的客户端和服务器端的通信过程。要同时启动两个terminal,一个运行Server，一个运行Client。通过Client向Server发送主机名和要检索的字符串。Server端接到客户端的请求后，便根据客户端发过来的原串去文件server.conf中检索其对应的值，找到后就把值返回给Client。否则返回"not find"
server.conf文件格式为：
name＝aaa
mail＝adfaf
：
：
:
编译源文件：gcc -o Server Server.c
gcc -o Client Client.c
先启动Server，在命令提示符下输入：Server
再启动Client，在命令提示符下输入：Client redhat4 name ＃我的主机名是redhat4
服务器端源码：
#include #include #include #include #include #include #include #include #define SERVPORT 35235 #define BACKLOG 10 main() { int sockfd,client_fd; struct sockaddr_in my_addr; struct sockaddr_in remote_addr; /* The fllow variables using to file */ char lineStr[30]; char recStr[20]; char headStr[15],tailStr[15]; char *delim="="; FILE *file; int flag=0; if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("socket error"); exit(1); } //设置本地socket实例的协议族，连接端口等 my_addr.sin_family=AF_INET; my_addr.sin_port=htons(SERVPORT); my_addr.sin_addr.s_addr = INADDR_ANY; bzero(&(my_addr.sin_zero),8); if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) { perror("bind error!"); exit(1); } if (listen(sockfd, BACKLOG) == -1) { perror("listen error!"); exit(1); } //监听并处理客户的连接请求 while(1) { int sin_size = sizeof(struct sockaddr_in); if ((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr, &sin_size)) == -1) { perror("accept error!"); continue; } printf("received a connection from %s\n", inet_nto(remote_addr.sin_addr)); //创建子进程，检索目标串并把结果返回个客户端 if (!fork()) { int len; if((len=recv(client_fd,recStr,30,0))==-1) { printf("Receive error!\n"); exit(1); } recStr[len]='\0'; file=fopen("server.conf","r"); printf("Client send: %s\n",recStr); while(fgets(lineStr,30,file)) { //以“＝”为标记，分别去等号的左边和右边，分别存入headStr和tailStr strcpy(headStr,strtok(lineStr,delim)); strcpy(tailStr,strtok(NULL,delim)); if(strcmp(headStr,recStr)==0) { flag=1; if(send(client_fd,tailStr,20,0)==-1) { perror("send error!"); exit(1); } /* break; */ } } if(flag==0) send(client_fd,"Not find",9,0); close(client_fd); exit(0); } close(client_fd); } }
客户端源码：
#include #include #include #include #include #include #include #include #define SERVPORT 35235 #define MAXDATASIZE 100 main(int argc, char *argv[]) { int sockfd, recvbytes; char buf[MAXDATASIZE]; struct hostent *host; struct sockaddr_in serv_addr; if (argc < 3) { fprintf(stderr,"Please enter the server's hostname and string!\n"); exit(1); } if((host=gethostbyname(argv[1]))==NULL) { herror("gethostbyname砮error!"); exit(1); } if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("socket?error!"); exit(1); } //设置连接服务器的协议族，端口号，服务器端的地址等 serv_addr.sin_family=AF_INET; serv_addr.sin_port=htons(SERVPORT); serv_addr.sin_addr = *((struct in_addr *)host->h_addr); bzero(&(serv_addr.sin_zero),8); if (connect(sockfd, (struct sockaddr *)&serv_addr,sizeof(struct sockaddr)) == -1) { perror("connect?error!"); exit(1); } if(send(sockfd,argv[2],20,0)==-1) { printf("send to server error!\n"); exit(1); } if ((recvbytes=recv(sockfd, buf, MAXDATASIZE, 0)) ==-1) { perror("recv?error"); exit(1); } buf[recvbytes] = '\0'; printf("Received: %s\n",buf); close(sockfd); }
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