리눅스 C언어 소켓 프로그래밍 질문

Question

안녕하세요.. C언어로 파일 전송 서버,클라이언트를 시험 중에 있습니다.현재 Local 환경에서는 파일 전송 서버,클라이언트가 제대로 작동 되는 것을 확인하였는데,이상하게 옆에 있는 컴퓨터에서 서로 다른 IP를 가진 서버와 클라이언트끼리 connect() 함수에서 에러가 납니다... 제가 초보라 이해를 잘 못한 건지...현재 window 컴퓨터에서 ms Appstore에서 ubuntu를 다운 받아서 서버와 클라이언트 실행 중입니다. 서버 컴퓨터의 IP는 아래 사진과 같습니다. 서버를 실행하고 ./server클라이언트에서 ./client 172.21.66.231이렇게 실행을 하면, 클라이언트 쪽에서아래와 같은 에러가 발생합니다. 서버 코드입니다.//////////////////////////////////// //Server code /////////////////////////////////// //This file is the code for the server #include // for sockaddr_in #include // for socket #include // for socket #include // for printf #include // for exit #include // for bzero #include //for time_t and time #define HELLO_WORLD_SERVER_PORT 7754 #define LENGTH_OF_LISTEN_QUEUE 20 #define BUFFER_SIZE 1024 int main(int argc, char **argv) { //Set a socket address structure server_addr, representing the server Internet address, port struct sockaddr_in server_addr; bzero(&server_addr,sizeof(server_addr)); //Set all the contents of a section of memory to 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); // time_t now; FILE *stream; //Create a streaming protocol (TCP)socket for the Internet, with server_socket representing the server socket int server_socket = socket(AF_INET,SOCK_STREAM,0); if( server_socket < 0) { printf("Create Socket Failed!"); exit(1); } //Connect the socket to the socket address structure 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 is used for listening if ( listen(server_socket, LENGTH_OF_LISTEN_QUEUE) ) { printf("Server Listen Failed!"); exit(1); } while (1) //The server side runs all the time { struct sockaddr_in client_addr; socklen_t length = sizeof(client_addr); 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); strcpy(buffer,"Hello,World! From the server! "); strcat(buffer,"n"); //C string concatenation send(new_server_socket,buffer,BUFFER_SIZE,0); bzero(buffer,BUFFER_SIZE); //Receives information sent by the client to the buffer length = recv(new_server_socket,buffer,BUFFER_SIZE,0); if (length < 0) { printf("Server Recieve Data Failed!n"); exit(1); } printf("n%s",buffer); if((stream = fopen("data1","r"))==NULL) { printf("The file 'data1' was not opened! n"); exit(1); } else printf("The file 'filename' was opened! n"); bzero(buffer,BUFFER_SIZE); int lengsize = 0; while((lengsize = fread(buffer,1,1024,stream)) > 0) { printf("lengsize = %dn",lengsize); if(send(new_server_socket,buffer,lengsize,0)<0) { printf("Send File is Failedn"); break; } bzero(buffer, BUFFER_SIZE); } if(fclose(stream)) printf("The file 'data' was not closed! n"); exit(1); //Close the connection to the client close(new_server_socket); } //Close the socket for listening close(server_socket); return 0; }클라이언트 코드입니다. //////////////////////////////////// //Client code /////////////////////////////////// //This file is the code for the client #include // for sockaddr_in #include // for socket #include // for socket #include // for printf #include // for exit #include // for bzero #include //for time_t and time #include #define HELLO_WORLD_SERVER_PORT 7754 #define BUFFER_SIZE 1024 int main(int argc, char **argv) { if (argc != 2) { printf("Usage: ./%s ServerIPAddressn",argv[0]); exit(1); } //time_t now; FILE *stream; //Set a socket address structure client_addr, representing the client Internet address, port struct sockaddr_in client_addr; bzero(&client_addr,sizeof(client_addr)); //Set all the contents of a section of memory to 0 client_addr.sin_family = AF_INET; //The family of Internet protocol client_addr.sin_addr.s_addr = htons(INADDR_ANY);//INADDR_ANY means automatically getting the local address client_addr.sin_port = htons(0); //0 means to have the system automatically assign a free port //Creates a stream protocol (TCP)socket for the Internet, with client_socket representing the client socket int client_socket = socket(AF_INET,SOCK_STREAM,0); if( client_socket < 0) { printf("Create Socket Failed!n"); exit(1); } //Associate the client's socket with the client's socket address structure if( bind(client_socket,(struct sockaddr*)&client_addr,sizeof(client_addr))) { printf("Client Bind Port Failed!n"); exit(1); } //Set a socket address structure server_addr, which represents the server's Internet address, port struct sockaddr_in server_addr; bzero(&server_addr,sizeof(server_addr)); server_addr.sin_family = AF_INET; if(inet_aton(argv[1],&server_addr.sin_addr) == 0) //The IP address of the server comes from the parameters of the program { printf("Server IP Address Error!n"); exit(1); } server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); socklen_t server_addr_length = sizeof(server_addr); //Initiates a connection to the server, and after a successful connection client_socket represents a socket connection between the client and the server if(connect(client_socket,(struct sockaddr*)&server_addr, server_addr_length) < 0) { printf("Can Not Connect To %s!n",argv[1]); exit(1); } char buffer[BUFFER_SIZE]; bzero(buffer,BUFFER_SIZE); //Receive data from the server to the buffer int length = recv(client_socket,buffer,BUFFER_SIZE,0); if(length < 0) { printf("Recieve Data From Server %s Failed!n", argv[1]); exit(1); } printf("n%sn",buffer); bzero(buffer,BUFFER_SIZE); bzero(buffer,BUFFER_SIZE); strcpy(buffer,"Hello, World! From Clientn"); //Sends the data in the buffer to the server send(client_socket,buffer,BUFFER_SIZE,0); if((stream = fopen("data","w+t"))==NULL) { printf("The file 'data' was not opened! n"); } else bzero(buffer,BUFFER_SIZE); length = 0; while( length = recv(client_socket,buffer,BUFFER_SIZE,0)) { if(length < 0) { printf("Recieve Data From Server %s Failed!n", argv[1]); break; } int write_length = fwrite(buffer,sizeof(char),length,stream); if (write_length

GAN · Accepted Answer

방화벽 문제 아닌가요?WSL 사용하고 계신 것 같은데 WSL 방화벽으로 검색 해보세요.

lIIIIIlllllI · Answer

GAN님 답변 감사합니다. 문제는 해결 되었습니다.ip 대역대의 문제인 것으로 확인했습니다.A Class B Class 172와 192 통신사이 문제가 있었던 것 같습니다.

리눅스 C언어 소켓 프로그래밍 질문

2개의 답변

Q&A 목록