Http Request : Winsock - http

Question

When coding http requests, i used Visual Studio for c++, now my code goes like this,
#define WIN32_LEAN_AND_MEAN
#include "stdafx.h"
#include <cstdio>
#include <cstdlib>
#include <Winsock2.h>
#include <WS2tcpip.h>
#include <windows.h>
#pragma comment (lib,"ws2_32")
int _tmain(int argc, _TCHAR* argv[])
{
WSADATA wsaData;
int iResult = WSAStartup(MAKEWORD(2,2),&wsaData);
SOCKET m_socket;
m_socket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if(m_socket==INVALID_SOCKET)
{
printf("Invalid Socket :WSAGetLastError()");
}
sockaddr_in clientService;
clientService.sin_family = AF_INET;
clientService.sin_addr.s_addr = inet_addr("127.0.0.1");
clientService.sin_port = htons(5357);
LPHOSTENT host = gethostbyname("72.144.89.32");
if(connect(m_socket,(SOCKADDR*)&clientService,sizeof(clientService))==SOCKET_ERROR)
{
printf("Connection Failure");
WSACleanup();
return 1;
}
char buffer[2048];
strcpy(buffer,"POST /dbarea.php HTTP/1.1\n");
strcat(buffer,"Content - Type:application/x-www-form-urlencoded\n");
strcat(buffer,"Host: localost\n");
strcat(buffer,"content-Length:32\n");
strcat(buffer,"\n");
strcat(buffer,"username=emeka1&password=laikan112");
//int n = write(SOCKADDR*,buffer,strlen(buffer));
printf("Data Sent Successfully..");
return 0;
}
Now my php is like this
<?php
session_start();
$username = urldecode($_POST['username']);
$password = urldecode($_POST['password']);
echo "Username: $username\nPassword:$password";
?>
Now i have an issue on the php area , its not receiving information and printing it again for us to see, what could possibly be the problem?

Answer 1

There are several errors in your HTTP request.
You need to use \r\n instead of \n.
Content - Type needs to be Content-Type.
localost needs to be localhost.
content-Length:32 needs to be Content-Length: 34
Try this:
int _tmain(int argc, _TCHAR* argv[])
{
WSADATA wsaData;
int iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
if (iResult != 0)
{
printf("WinSock startup error: %d\n", iResult);
return 1;
}
SOCKET m_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (m_socket == INVALID_SOCKET)
{
printf("Socket creation error: %d\n", WSAGetLastError());
WSACleanup();
return 1;
}
sockaddr_in clientService = {0};
clientService.sin_family = AF_INET;
clientService.sin_addr.s_addr = inet_addr("127.0.0.1");
clientService.sin_port = htons(5357);
if (connect(m_socket, (SOCKADDR*)&clientService, sizeof(clientService)) == SOCKET_ERROR)
{
printf("Connection error: %d\n", WSAGetLastError());
closesocket(m_socket);
WSACleanup();
return 1;
}
char buffer[2048];
strcpy(buffer, "POST /dbarea.php HTTP/1.1\r\n");
strcat(buffer, "Content-Type: application/x-www-form-urlencoded\r\n");
strcat(buffer, "Host: localhost:5357\r\n");
strcat(buffer, "Content-Length: 34\r\n");
strcat(buffer, "\r\n");
strcat(buffer, "username=emeka1&password=laikan112");
char ptr = buffer;
int len = strlen(buffer);
do
{
int n = send(m_socket, ptr, len, 0);
if (n < 1)
{
if (n == SOCKET_ERROR)
printf("Send error: %d\n", WSAGetLastError());
else
printf("disconnected by server\n");
closesocket(m_socket);
WSACleanup();
return 1;
}
ptr += n;
len -= n;
}
while (len > 0);
printf("Data Sent Successfully..\n");
closesocket(m_socket);
WSACleanup();
return 0;
}
You really should not write your own HTTP code from scratch like this, when there are better alternatives available, such as Microsoft's WinInet/WinHTTP APIs, the curl library, etc. Let them do the hard work for you.
#include <WinInet.h>
#include <tchar.h>
void ReportWinInetError(const char *operation)
{
DWORD dwErr = GetLastError();
if (dwErr == ERROR_INTERNET_EXTENDED_ERROR)
{
LPTSTR szBuffer = NULL;
DWORD dwLength = 0;
BOOL bRet = InternetGetLastResponseInfo(&dwErr, NULL, &dwLength);
if ((bRet == FALSE) && (GetLastError() == ERROR_INSUFFICIENT_BUFFER))
{
szBuffer = new TCHAR[dwLength+1];
bRet = InternetGetLastResponseInfo(&dwErr, szBuffer, &dwLength);
}
if (bRet)
_tprintf(_T("WinInet error while %hs: %u %*s"), operation, dwErr, dwLength, szBuffer);
else
printf("Unknown WinInet error while %s", operation);
delete[] szBuffer;
}
else
printf("WinInet error while %s: %u", operation, dwErr);
}
int _tmain(int argc, _TCHAR* argv[])
{
HINTERNET hInternet = InternetOpen(TEXT("MyApp"), INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
if (!hInternet)
{
ReportWinInetError("opening session");
return 1;
}
HINTERNET hConnect = InternetConnect(hInternet, TEXT("127.0.0.1"), 5357, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 0);
if (!hConnect)
{
ReportWinInetError("connecting session");
InternetCloseHandle(hInternet);
return 1;
}
HINTERNET hRequest = HttpOpenRequest(hConnect, TEXT("POST"), TEXT("/dbarea.php"), TEXT("HTTP/1.1"), NULL, NULL, 0, 0);
if (!hRequest)
{
ReportWinInetError("opening request");
InternetCloseHandle(hConnect);
InternetCloseHandle(hInternet);
return 1;
}
if (!HttpSendRequest(hRequest, TEXT("Content-Type: application/x-www-form-urlencoded"), -1, "username=emeka1&password=laikan112", 34))
{
ReportWinInetError("sending request");
InternetCloseHandle(hRequest);
InternetCloseHandle(hConnect);
InternetCloseHandle(hInternet);
return 1;
}
printf("Data Sent Successfully..\n");
InternetCloseHandle(hRequest);
InternetCloseHandle(hConnect);
InternetCloseHandle(hInternet);
return 0;
}
#include <curl/curl.h>
int _tmain(int argc, _TCHAR* argv[])
{
CURLCode ret = curl_global_init(CURL_GLOBAL_DEFAULT);
if (ret != CURLE_OK)
{
printf("Curl init error: %d\n", ret);
return 1;
}
CURL *curl = curl_easy_init();
if (!curl)
{
printf("Curl request creation error\n");
curl_global_cleanup();
return 1;
}
curl_easy_setopt(curl, CURLOPT_URL, "http://127.0.0.1:5357/dbarea.php");
curl_easy_setopt(curl, CURLOPT_POST, 1);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "username=emeka1&password=laikan112");
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, -1);
ret = curl_easy_perform(curl);
if (ret != CURLE_OK)
{
printf("Curl send error: %d\n", ret);
curl_easy_cleanup(curl);
curl_global_cleanup();
return 1;
}
printf("Data Sent Successfully..\n");
curl_easy_cleanup(curl);
curl_global_cleanup();
}