Vortex 0번 문제 풀이

0번문제 ;; 처음에 조낸 삽질; 접속했는데 아무것도 안나오고;

문제가 먼지도 몰랐다;

요점은 결국 코딩;

처음에 4개 숫자라길래 포트인줄알고 조낸 더해서 보냈다;; 하지만 서버는 알수없는문자만 계속 토하고;;

접속해서 숫자를 주는건가 했는데 역시 이상한 문자만 조낸 토하고;

뭐 결국 했지만 처음에 접속하면 어떤 값을준다; 이거 다 더해서 다시 보내면 답이~ 짜짠~

코딩을 잘 못해서 소스는 지랄;;;


환경 : windows vista / VS2008 환경

하시려면 ws2_32.lib추가해주셔야 합니다.

추가법은 제 블로그 팁에 보시면 나와있어요.

/*  stdafx.h */
#include <stdio.h>
#include <tchar.h>
#include <winsock.h>    /* for socket(),... */
#include <stdlib.h>     /* for exit() */
#include <direct.h>
#include <conio.h>

---

/* vortex_0.cpp*/

#include "stdafx.h"
#define RCVBUFSIZE 64 
union ChangeU
{
 char hex[4];
 unsigned int sum;
 
};

void main(int argc, char *argv[])
{
 union ChangeU con1,con2,con3,con4,sum;
    int sock;                      
    struct sockaddr_in echoServAddr;
    unsigned short echoServPort;    
    char *servIP;                   
    char *echoString;               
    char echoBuffer[RCVBUFSIZE];    
    int echoStringLen;              
    int bytesRcvd, totalBytesRcvd;  
    WSADATA wsaData;                
    servIP = "69.55.233.89";           
  
 echoServPort = 5842;

    if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0)
    {
        fprintf(stderr, "WSAStartup() failed");
        exit(1);
    }
   
    if ((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
        printf("error socket\n");

    memset(&echoServAddr, 0, sizeof(echoServAddr));   
    echoServAddr.sin_family      = AF_INET;            
    echoServAddr.sin_addr.s_addr = inet_addr(servIP); 
    echoServAddr.sin_port        = htons(echoServPort); 

    if (connect(sock, (struct sockaddr *) &echoServAddr, sizeof(echoServAddr)) < 0)
        printf("error connect\n");
 printf("connected!\n");

    totalBytesRcvd = 0;
    printf("Received: ");               
       
        if ((bytesRcvd = recv(sock, echoBuffer, RCVBUFSIZE - 1, 0)) <= 0)
            printf("error recv\n");
        totalBytesRcvd += bytesRcvd;  
        echoBuffer[bytesRcvd] = '\0';

  unsigned int bufferx=unsigned int(echoBuffer);
  printf("receved!\n");
        printf(echoBuffer);
  printf("\n%u\n",bufferx);

  echoStringLen=strlen(echoBuffer);
  printf("LEN = %d\n",echoStringLen);

  con1.hex[0]=echoBuffer[0];
  con1.hex[1]=echoBuffer[1];
  con1.hex[2]=echoBuffer[2];
  con1.hex[3]=echoBuffer[3];

  memset(echoBuffer,0,RCVBUFSIZE);
  if ((bytesRcvd = recv(sock, echoBuffer, RCVBUFSIZE - 1, 0)) <= 0)
            printf("error recv\n");
        totalBytesRcvd += bytesRcvd; 

  con2.hex[0]=echoBuffer[0];
  con2.hex[1]=echoBuffer[1];
  con2.hex[2]=echoBuffer[2];
  con2.hex[3]=echoBuffer[3];
  con3.hex[0]=echoBuffer[4];
  con3.hex[1]=echoBuffer[5];
  con3.hex[2]=echoBuffer[6];
  con3.hex[3]=echoBuffer[7];
  con4.hex[0]=echoBuffer[8];
  con4.hex[1]=echoBuffer[9];
  con4.hex[2]=echoBuffer[10];
  con4.hex[3]=echoBuffer[11];

  printf("%u %u %u %u",con1.sum,con2.sum,con3.sum,con4.sum);
  sum.sum=con1.sum+con2.sum+con3.sum+con4.sum;
  printf("\nSUM = %u\n",sum.sum);
  printf("%x ",(unsigned char)sum.hex[0]);
  printf("%x ",(unsigned char)sum.hex[1]);
  printf("%x ",(unsigned char)sum.hex[2]);
  printf("%x\n",(unsigned char)sum.hex[3]);
    
  memset(echoBuffer,0,RCVBUFSIZE);
  echoBuffer[0]=(unsigned char)sum.hex[0];
  echoBuffer[1]=(unsigned char)sum.hex[1];
  echoBuffer[2]=(unsigned char)sum.hex[2];
  echoBuffer[3]=(unsigned char)sum.hex[3];
  
  echoStringLen = strlen(echoBuffer);
  printf("SEND MSG = %s   %d\n",echoBuffer,echoBuffer);
  printf("LEN = %d\n",echoStringLen);
  if (send(sock, echoBuffer, echoStringLen, 0) != echoStringLen)
   printf("error send\n");

   printf("sended!\n");
  memset(echoBuffer,0,RCVBUFSIZE);

  if ((bytesRcvd = recv(sock, echoBuffer, RCVBUFSIZE - 1, 0)) <= 0)
            printf("error recv\n");
        totalBytesRcvd += bytesRcvd;  
        echoBuffer[bytesRcvd] = '\0';
  printf("\n");
  printf("%s %x %d",echoBuffer,echoBuffer,echoBuffer);
  
    printf("\n");   
    closesocket(sock);
    WSACleanup();  

    getch();
    exit(0);
}

C:\Users\nvdark\Documents\Visual Studio 2008\Projects\vortex_0\Debug>vortex_0.ex
e
connected!
Received: receved!
??
2225832
LEN = 4
764362167 745031041 704972364 738382526
SUM = 2952748098
42 5c ff af
SEND MSG = B\?  2225832
LEN = 4
sended!

Username: vortex1 Password: XXXXXXXXX 21f6a8 2225832