소켓 프로그래밍 - 서버

아래의 소켓 - 서버 예제 프로그램을 참조한다.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>


//소켓 프로그래밍에 사용될 헤더파일 선언

#define BUF_LEN 128
//메시지 송수신에 사용될 버퍼 크기를 선언

int main(int argc, char *argv[])
{
    char buffer[BUF_LEN];
    struct sockaddr_in server_addr, client_addr;
    char temp[20];
    int server_fd, client_fd;
    //server_fd, client_fd : 각 소켓 번호
    int len, msg_size;
    int port = 9876;

    if(argc != 2)
    {
        printf("usage : %s [port]\n", argv[0]);
        exit(0);
    }

    if((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {// 소켓 생성
        printf("Server : Can't open stream socket\n");
        exit(0);
    }
    memset(&server_addr, 0x00, sizeof(server_addr));
    //server_Addr 을 NULL로 초기화

    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    server_addr.sin_port = htons(port));
    //server_addr 셋팅

    if(bind(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) <0)
    {//bind() 호출
        printf("Server : Can't bind local address.\n");
        exit(0);
    }

    if(listen(server_fd, 5) < 0)
    {//소켓을 수동 대기모드로 설정
        printf("Server : Can't listening connect.\n");
        exit(0);
    }

    memset(buffer, 0x00, sizeof(buffer));
    printf("Server : wating connection request.\n");
    len = sizeof(client_addr);

    client_fd = accept(server_fd, (struct sockaddr *)&client_addr, &len);
    if(client_fd < 0)
    {
        printf("Server: accept failed.\n");
        exit(0);
    }
//        inet_ntop(AF_INET, &client_addr.sin_addr.s_addr, temp, sizeof(temp));
//        printf("Server : %s client connected.\n", temp);

		int exit_flag =1;
		char full_path[100] = {0,};
		char backup[1024] = {0,};
		FILE *rfp = NULL;

		while(exit_flag) {
	    msg_size = read(client_fd, buffer, 1024);

	    if(strncmp(buffer,"ACK",3) == 0) {
	    	if(!feof(rfp)) {
	    		char rbuf[1024] = {0,};
	    		fgets(rbuf, sizeof(rbuf), rfp);
	    		write(client_fd, rbuf, strlen(rbuf)+1);
	    		memset(backup,0x00,sizeof(backup));
	    		strcpy(backup,rbuf);
	    	}else {
	    		exit_flag =0;
	    	}
	    }else if(strncmp(buffer,"ACK",3) == 0) {
	    	write(client_fd, backup, strlen(backup)+1);
	    }else if(atoi(buffer) > 0) {
	    	//fclose() .. rfp , wfp
	    	//fopen with full_path
	    	// move to line ( for(i<line) { fgets() }
	    	//rearrange with rfp, wfp
	    }else {
	    	//fopen with full path
	    	// fget with one line
	    	// write to client
	    }
    }

    // write(client_fd, buffer, msg_size);
	  fclose(rfp);
	  close(client_fd);
	  //printf("Server : %s client closed.\n", temp);
    close(server_fd);

    return 0;
}

 

아래 참조 링크 참조한다.

https://luckyyowu.tistory.com/88