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P3-Loader/HTTPClient.cpp

@@ -0,0 +1,72 @@
+#include "HTTPClient.h"
+
+#pragma comment(lib, "wininet.lib")
+
+HTTPClient::HTTPClient(const wchar_t* user_agent)
+{
+	m_hInternet = InternetOpenW(user_agent, INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
+	if (!m_hInternet) {
+		printf("[-] InternetOpen failed with error: %d\n", GetLastError());
+	}
+}
+
+HTTPClient::~HTTPClient()
+{
+	if (m_hInternet)
+		InternetCloseHandle(m_hInternet);
+}
+
+std::vector<uint8_t> HTTPClient::DownloadURL(const wchar_t* url)
+{
+	std::vector<uint8_t> result;
+
+	if (!m_hInternet) {
+		return result;
+	}
+
+	HINTERNET hInternet_url;
+	hInternet_url = InternetOpenUrlW(m_hInternet, url, NULL, 0, 0, NULL);
+	if (!hInternet_url) {
+		printf("[-] InternetOpenUrlW failed with error: %d\n", GetLastError());
+		return result;
+	}
+
+	BOOL success;
+	DWORD status;
+	DWORD index = 0;
+	DWORD query_size = sizeof(status);
+	success = HttpQueryInfoW(hInternet_url, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER, &status, &query_size, &index);
+	if (!success) {
+		printf("[-] HttpQueryInfoW status failed with error: %d\n", GetLastError());
+		InternetCloseHandle(hInternet_url);
+		return result;
+	}
+	if (query_size != sizeof(status)) {
+		printf("[-] HttpQueryInfoW status, retrieved too few bytes\n");
+		InternetCloseHandle(hInternet_url);
+		return result;
+	}
+	if (status != HTTP_STATUS_OK) {
+		printf("[-] Error HTTP Status: %d\n", status);
+		InternetCloseHandle(hInternet_url);
+		return result;
+	}
+
+
+	uint8_t tempbuf[1024];
+	DWORD nBytesRead = 0;
+	do {
+		nBytesRead = 0;
+		success = InternetReadFile(hInternet_url, tempbuf, 1024, &nBytesRead);
+		if (!success) {
+			printf("[-] InternetReadFile failed with error: %d\n", GetLastError());
+			InternetCloseHandle(hInternet_url);
+			return result;
+		}
+		result.insert(result.end(), tempbuf, tempbuf + nBytesRead);
+	} while (nBytesRead == 1024);
+
+	InternetCloseHandle(hInternet_url);
+
+	return result;
+}