Sending post request with libcurl - c++

Question

I am trying to login to Twitter via CURL.
This is my code:
#include <iostream>
#include <string>
#include <curl\curl.h>
#include <sstream>
using std::string;
size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream)
{
std::string buf = std::string(static_cast<char *>(ptr), size * nmemb);
std::stringstream *response = static_cast<std::stringstream *>(stream);
response->write(buf.c_str(), (std::streamsize)buf.size());
return size * nmemb;
}
int main(int argc, char*argv[])
{
std::string target = "https://twitter.com/login";
CURL *curl;
CURLcode res;
std::stringstream response;
char* data = "session[username_or_email]=user&session[password]=pass";
struct curl_slist *chunk = NULL;
curl_global_init(CURL_GLOBAL_DEFAULT);
curl = curl_easy_init();
if (curl) {
curl_easy_setopt(curl, CURLOPT_URL, target.c_str());
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_VERBOSE, true);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
curl_easy_setopt(curl, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)");
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, true);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
curl_global_cleanup();
}
std::cout << response.str() << std::endl;
cin.ignore();
return 0;
}
And I'm getting this message:
403 Forbidden: The server understood the request, but is refusing to
fulfill it
What should I do?

Answer 1

I suggest your request is (correctly) being identified as coming from a program not a human, and therefore denied.
It will be a matter of capturing all the right headers and cookies from a "real" (ie browser) session... But really, I think you'd be better off working with the Twitter api, as that is what it's designed for.