C언어 사용한 기본적인 서버 프로그램

 

 

프로그램 사용 함수 관련 포스팅 참고

서버 프로그램과 클라이언트 프로그램 만들기

 

 

 

 

 

 

문제가 없을 시 뜨는 화면내용

 

 

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include "MySocketError.h"
#pragma comment(lib, "ws2_32.lib")
#define SERVER_IP  "외부ip"
#define SERVER_PORT 원하는 포트	//well-known port만 아니면 된다.


int main(void)
{
	int result = -1;
    
	//WSAStartup
	WSADATA wData = { 0 };
	result = WSAStartup(MAKEWORD(2, 2), &wData);
	if (!result) OKMsg("WSAStartup");
	else ErrorExit("WSAStartup");


	//socket
	SOCKET serverSocket;
	serverSocket = socket(AF_INET, SOCK_STREAM, 0);
	if (serverSocket == INVALID_SOCKET)
		ErrorExit("socket");
	else OKMsg("socket");


	//bind	-	IP/PORT 바인드(묶어준다)
	SOCKADDR_IN serverAddress = { 0 };
	serverAddress.sin_family = AF_INET;	//PF_INET
	serverAddress.sin_port = htons(SERVER_PORT);	//host - to network short
	serverAddress.sin_addr.s_addr = htonl(INADDR_ANY);
	serverAddress.sin_addr.s_addr = inet_addr(SERVER_IP);
	result = bind(serverSocket, (SOCKADDR*)&serverAddress, sizeof(serverAddress));
	if (result == SOCKET_ERROR)
		ErrorMsg("bind");
	else OKMsg("bind");


	//listen
	result = listen(serverSocket, 5);
	if (result == SOCKET_ERROR)
		ErrorMsg("listen");
	else OKMsg("listen");


	//accept
	SOCKET clientSocket;
	SOCKADDR_IN clientAddress = { 0 };
	memset(&clientAddress, 0, sizeof(clientAddress));
	int sizeClientAddress = sizeof(clientAddress);
	clientSocket = accept(serverSocket, (SOCKADDR*)&clientAddress,
		&sizeClientAddress);
	if (clientSocket == INVALID_SOCKET)
		ErrorMsg("accept");
	else OKMsg("accept");
	printf("client(IP:%s,PORT:%d)accepted\n", inet_ntoa(clientAddress.sin_addr), ntohs(clientAddress.sin_port));
	char clientIP[20] = { 0 };
	printf("[client IP:%s,PORT:%d] accepted\n", clientIP, ntohs(clientAddress.sin_port));


	//send/recv
    
    
	//closesocket	 -	serverSocket 닫는 것
	result = closesocket(serverSocket);
	if (result == SOCKET_ERROR)
		ErrorMsg("closesocket");
	else OKMsg("closesocket");


	//WSACleanup
	result = WSACleanup();
	if (result == SOCKET_ERROR)
		ErrorMsg("WSACleanup");
	else OKMsg("WSACleanup");



	return 0;
}