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• • 1 簡單回聲服務器的實現

1 簡單回聲服務器的實現

實現非常非常簡單，而且沒啥實用價值，代碼如下：

server.c：

#include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <string.h> #include <ctype.h> #include <arpa/inet.h>#define SERVER_PORT 666int main(void){int sock;//代表信箱struct sockaddr_in server_addr;//1.美女創建信箱sock = socket(AF_INET, SOCK_STREAM, 0);//2.清空標簽，寫上地址和端口號bzero(&server_addr, sizeof(server_addr));server_addr.sin_family = AF_INET;//選擇協議族IPV4server_addr.sin_addr.s_addr = htonl(INADDR_ANY);//監聽本地所有IP地址server_addr.sin_port = htons(SERVER_PORT);//綁定端口號//實現標簽貼到收信得信箱上bind(sock, (struct sockaddr *)&server_addr, sizeof(server_addr));//把信箱掛置到傳達室，這樣，就可以接收信件了listen(sock, 128);//萬事俱備，只等來信printf("等待客戶端的連接\n");int done =1;while(done){struct sockaddr_in client;int client_sock, len;char client_ip[64];char buf[256];socklen_t client_addr_len;client_addr_len = sizeof(client);client_sock = accept(sock, (struct sockaddr *)&client, &client_addr_len);//打印客服端IP地址和端口號printf("client ip: %s\t port : %d\n",inet_ntop(AF_INET, &client.sin_addr.s_addr,client_ip,sizeof(client_ip)),ntohs(client.sin_port));/*讀取客戶端發送的數據*/len = read(client_sock, buf, sizeof(buf)-1);buf[len] = '\0';printf("receive[%d]: %s\n", len, buf);//轉換成大寫for(i=0; i<len; i++){/*if(buf[i]>='a' && buf[i]<='z'){buf[i] = buf[i] - 32;}*/buf[i] = toupper(buf[i]);}len = write(client_sock, buf, len);printf("finished. len: %d\n", len);close(client_sock);}close(sock);return 0; }

client.c：

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <netinet/in.h>#define SERVER_PORT 666 #define SERVER_IP "127.0.0.1"int main(int argc, char *argv[]){int sockfd;char *message;struct sockaddr_in servaddr;int n;char buf[64];if(argc != 2){fputs("Usage: ./echo_client message \n", stderr);exit(1);}message = argv[1];printf("message: %s\n", message);sockfd = socket(AF_INET, SOCK_STREAM, 0);memset(&servaddr, '\0', sizeof(struct sockaddr_in));servaddr.sin_family = AF_INET;inet_pton(AF_INET, SERVER_IP, &servaddr.sin_addr);servaddr.sin_port = htons(SERVER_PORT);connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));write(sockfd, message, strlen(message));n = read(sockfd, buf, sizeof(buf)-1);if(n>0){buf[n]='\0';printf("receive: %s\n", buf);}else {perror("error!!!");}printf("finished.\n");close(sockfd);return 0; }

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參考資料：

C/C++從入門到精通-高級程序員之路【奇牛學院】

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