linux-TCP.rar_LINUX TCP _Linux 网络 编程_linux c_linux tcp传输_tcp lin

#include <netinet/in.h> // for sockaddr_in #include <sys/types.h> // for socket #include <sys/socket.h> // for socket #include <stdio.h> // for printf #include <stdlib.h> // for exit #include <string.h> // for bzero /* #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> */ #define HELLO_WORLD_SERVER_PORT 6666 #define LENGTH_OF_LISTEN_QUEUE 20 #define BUFFER_SIZE 1024 #define FILE_NAME_MAX_SIZE 512 int main(int argc, char **argv) { //设置一个socket地址结构server_addr,代表服务器internet地址, 端口 struct sockaddr_in server_addr; bzero(&server_addr,sizeof(server_addr)); //把一段内存区的内容全部设置为0 server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr = htons(INADDR_ANY); server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); //创建用于internet的流协议(TCP)socket,用server_socket代表服务器socket int server_socket = socket(PF_INET,SOCK_STREAM,0); if( server_socket < 0) { printf("Create Socket Failed!"); exit(1); } //把socket和socket地址结构联系起来 if( bind(server_socket,(struct sockaddr*)&server_addr,sizeof(server_addr))) { printf("Server Bind Port : %d Failed!", HELLO_WORLD_SERVER_PORT); exit(1); } //server_socket用于监听 if ( listen(server_socket, LENGTH_OF_LISTEN_QUEUE) ) { printf("Server Listen Failed!"); exit(1); } while (1) //服务器端要一直运行 { //定义客户端的socket地址结构client_addr struct sockaddr_in client_addr; socklen_t length = sizeof(client_addr); //接受一个到server_socket代表的socket的一个连接 //如果没有连接请求,就等待到有连接请求--这是accept函数的特性 //accept函数返回一个新的socket,这个socket(new_server_socket)用于同连接到的客户的通信 //new_server_socket代表了服务器和客户端之间的一个通信通道 //accept函数把连接到的客户端信息填写到客户端的socket地址结构client_addr中 int new_server_socket = accept(server_socket,(struct sockaddr*)&client_addr,&length); if ( new_server_socket < 0) { printf("Server Accept Failed!\n"); break; } char buffer[BUFFER_SIZE]; bzero(buffer, BUFFER_SIZE); length = recv(new_server_socket,buffer,BUFFER_SIZE,0); if (length < 0) { printf("Server Recieve Data Failed!\n"); break; } char file_name[FILE_NAME_MAX_SIZE+1]; bzero(file_name, FILE_NAME_MAX_SIZE+1); strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer)); // int fp = open(file_name, O_RDONLY); // if( fp < 0 ) FILE * fp = fopen(file_name,"r"); if(NULL == fp ) { printf("File:\t%s Not Found\n", file_name); } else { bzero(buffer, BUFFER_SIZE); int file_block_length = 0; // while( (file_block_length = read(fp,buffer,BUFFER_SIZE))>0) while( (file_block_length = fread(buffer,sizeof(char),BUFFER_SIZE,fp))>0) { printf("file_block_length = %d\n",file_block_length); //发送buffer中的字符串到new_server_socket,实际是给客户端 if(send(new_server_socket,buffer,file_block_length,0)<0) { printf("Send File:\t%s Failed\n", file_name); break; } bzero(buffer, BUFFER_SIZE); } // close(fp); fclose(fp); printf("File:\t%s Transfer Finished\n",file_name); } //关闭与客户端的连接 close(new_server_socket); } //关闭监听用的socket close(server_socket); return 0; }