php - 使用 C++ HTTP 请求将文件上传到服务器

Question

因此，我尝试使用 winsock 从 Windows 7 客户端将文件上传到服务器。为了做到这一点，我设置了套接字，然后创建了一个 HTTP POST 请求，该请求应该将所有数据发送到服务器上的 PHP 文件，然后服务器将上传它。创建请求的代码是...

#include <winsock2.h>
#include <windows.h>
#include <iostream>

using namespace std;
int main (int argc, char* argv[]){
   WSADATA wsaData;
   char* fileName = argv[1];
   WSAStartup(MAKEWORD(2,2), &wsaData);
   SOCKET Socket=socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
   struct hostent *host;
   host = gethostbyname("localhost");
   SOCKADDR_IN SockAddr;
   SockAddr.sin_port=htons(80);
   SockAddr.sin_family=AF_INET;
   SockAddr.sin_addr.s_addr = *((unsigned long*)host->h_addr);
   cout << "Connecting...\n";
   connect(Socket,(SOCKADDR*)(&SockAddr),sizeof(SockAddr);
   cout << "Connected.\n";

   char *header="POST /upload.php HTTP/1.1\r\n"
         "Host: localhost\r\n"
         "Content-Type: multipart/form-data; boundary=myboundary\r\n"
         "Connection: close\r\n"
         "\r\n--myboundary\r\n"
         "Content-Type: application/octet-stream\r\n"
         "Content-Disposition: form-data; name=\"myfile\"; filename=\"myfile.ext\"\r\n"
         "Content-Transfer-Encoding: 8bit\r\n"
         "\r\n";

    // Open the existing file.
   HANDLE hFile = CreateFile(fileName, GENERIC_READ, 0, NULL,
                             OPEN_EXISTING, FILE_ATTRIBUTE_READONLY, NULL);

   int size = GetFileSize(hFile, NULL);

   send(Socket,header, strlen(header),0);
   //send the file to the server
   int bytesSent = 0;
   do{
      char buff[300];
      DWORD dwBytesRead;
      //Copy file into array buff
      if(!ReadFile(hFile, buff, 300, &dwBytesRead, NULL)){
         cout << GetLastError << endl;
         return 1;
      }
      bytesSent += send(Socket, buff, dwBytesRead, 0);
      cout << "Bytes Sent " << bytesSent << endl;
   }while(bytesSent < size);
   char *footer = "\r\n--myboundary--\r\n";
   send(Socket, footer, strlen(footer), 0);
   closesocket(Socket);
   WSACleanup();
   cout<<endl<<endl;
   return 0;
}

虽然接收文件的 PHP 代码是...

<?php
$target_dir = "recvFile/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if file already exists
if (file_exists($target_file)) {
    echo "File already exists";
    $uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
    echo "File to large";
    $uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "ERROR File not uploaded";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
    } else {
        echo "ERROR uploading file";
    }
}
?>

但是 $_FILES 中从来没有任何东西，所以上传总是失败。我是否错误地创建了 HTTP 请求？我需要特别说明文件在 myboundary 之后吗？此外，如果有资源包含从头开始创建 HTTP 请求的示例，那将非常有用，因为出于某种原因，wireshark 甚至看不到请求，这使得弄清楚发生了什么变得更加困难。

PS 这是我第一次在 StackOverflow 上提问，所以如果我搞砸了某些格式或行为，请告诉我，以便我进行修复!

Answer 1

我遇到的问题实际上相对容易解决。首先我需要添加一个用户代理，其次我需要定义一个内容长度，它是整个 http 请求的长度(不仅仅是数据部分)。我完成的 HTTP 请求然后显示为:

POST /upload.php HTTP/1.1
Host: localhost
Content-Length: 800
Content-Type: multipart/form-data; boundary=WrbKitFormBoundaryXtRo8bh7ZpnTrTwd
User-Agent: 1337
Connection: keep-alive

--WrbKitFormBoundaryXtRo8bh7ZpnTrTwd
Content-Disposition: form-data; name="fileToUpload"; filename="testMac.cpp"
Content-Type: application/octet-stream

//SEND RAW FILE DATA HERE

--WrbKitFormBoundaryXtRo8bh7ZpnTrTwd