Question

我正在尝试在Windows 10的Visual Studio 2017（社区）上将Curl设置为与FTPS一起使用，但是我一直收到奇怪的错误（我尝试过的不同操作中包含的错误）。我目前有Curl在Mac上的FTPS上工作，目前在Linux上不需要它。

我尝试过的事情：

通过Curls Download Page下载二进制文件要为MacO设置Curl，我要做的就是下载MacOs二进制文件并链接它，因此这就是我开始为Windows设置Curl的地方。但是，在下载二进制文件时，它仅包含.dll。它缺少标头和.lib文件。我尝试下载大约5个其他二进制文件，每个二进制文件都至少缺少一个基本文件。

通过vcpkg安装无法获取二进制文件后，我意识到Curl可能位于vcpkg上。我跑了 ./vcpkg install curl来自vcpkg master。经过几分钟的编译，它成功了。然后，我去了我的项目，并通过测试ftps传输将其链接到curl。这是Curls Example page

中的示例

#include <stdio.h>

#include <curl/curl.h>

/* <DESC>
 * Get a single file from an FTP server.
 * </DESC>
 */ 

struct FtpFile {
  const char *filename;
  FILE *stream;
};

static size_t my_fwrite(void *buffer, size_t size, size_t nmemb, void *stream)
{
  struct FtpFile *out = (struct FtpFile *)stream;
  if(out && !out->stream) {
   /* open file for writing */ 
     out->stream = fopen(out->filename, "wb");
    if(!out->stream)
      return -1; /* failure, can't open file to write */ 
  }
  return fwrite(buffer, size, nmemb, out->stream);
}


int main(void)
{
  CURL *curl;
  CURLcode res;
  struct FtpFile ftpfile = {
    "C:\Users\myUser\Desktop\file.png", /* name to store the file as if successful */ 
    NULL
  };

  curl_global_init(CURL_GLOBAL_DEFAULT);

  curl = curl_easy_init();
  if(curl) {
    /*
     * You better replace the URL with one that works!
     */ 
    curl_easy_setopt(curl, CURLOPT_URL,
                 "ftp://my.ip.adress.here/path/to/file.png"); //Not actual address
    /* Define our callback to get called when there's data to be written */ 
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_fwrite);
    /* Set a pointer to our struct to pass to the callback */ 
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ftpfile);

    /* Switch on full protocol/debug output */ 
    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);

    //Extra options to enable ssl (not included in example)
    curl_easy_setopt(FTPAgent,CURLOPT_USE_SSL,CURLUSESSL_ALL);
    curl_easy_setopt(FTPAgent,CURLOPT_SSL_VERIFYPEER,0L);
    curl_easy_setopt(FTPAgent,CURLOPT_USERNAME,"Username"); //Not actual username
    curl_easy_setopt(FTPAgent,CURLOPT_PASSWORD,"Password"); //Not actual password for obvious reasons

    res = curl_easy_perform(curl);

    /* always cleanup */ 
    curl_easy_cleanup(curl);

    if(CURLE_OK != res) {
      /* we failed */ 
      fprintf(stderr, "curl told us %d\n", res);
    }
  }

  if(ftpfile.stream)
    fclose(ftpfile.stream); /* close the local file */ 

  curl_global_cleanup();

  return 0;
}

该项目已编译并运行，但是在尝试下载文件时，调试控制台中出现错误，指出Curl与FTPS协议不兼容。我故意使用Explicit FTPS，因为这是我将服务器配置为接受的，并且我可以使用Mac上Curl以及Mac和Windows中FileZilla的Explicit FTPS连接到它。如果有人知道如何解决此问题，请lmk。目前我已经放弃通过vcpkg使用curl

编译源代码我最后保存了此代码，因为我找不到用于构建Curl的任何指令，但是最终我找到了This并按照答案中的说明进行操作，其中使用curl的版本来消除除变量之外的任何变量。我在VS2017而不是VS2013上的事实。我第二次这样做时，有人请我看着它，以确保我正确地执行了所有步骤，因此，大约90％的人确定我正确地执行了这些说明。完成说明后，我使用了与上面相同的代码。它编译并运行没有错误，但是每当我尝试下载任何大小的文件时（我不确定截止值，但一个4kb的文件都能正常工作，而78kb的文件却没有），它说解密数据失败大约需要20倍的数据然后挂起：

*   Trying my.ip.adress.here...
* TCP_NODELAY set
* Connected to my.ip.adress.here (my.ip.adress.here) port 21 (#0)
< 220 (vsFTPd 2.2.2)
> AUTH SSL
< 234 Proceed with negotiation.
* schannel: SSL/TLS connection with my.ip.adress.here port 21 (step 1/3)
* schannel: disabled server certificate revocation checks
* schannel: using IP address, SNI is not supported by OS.
* schannel: sending initial handshake data: sending 147 bytes...
* schannel: sent initial handshake data: sent 147 bytes
* schannel: SSL/TLS connection with my.ip.adress.here port 21 (step 2/3)
* schannel: failed to receive handshake, need more data
* schannel: SSL/TLS connection with my.ip.adress.here port 21 (step 2/3)
* schannel: encrypted data got 1034
* schannel: encrypted data buffer: offset 1034 length 4096
* schannel: a client certificate has been requested
* schannel: SSL/TLS connection with my.ip.adress.here port 21 (step 2/3)
* schannel: encrypted data buffer: offset 1034 length 4096
* schannel: sending next handshake data: sending 349 bytes...
* schannel: SSL/TLS connection with my.ip.adress.here port 21 (step 2/3)
* schannel: encrypted data got 250
* schannel: encrypted data buffer: offset 250 length 4096
* schannel: SSL/TLS handshake complete
* schannel: SSL/TLS connection with my.ip.adress.here port 21 (step 3/3)
* schannel: stored credential handle in session cache
> USER Username
* schannel: client wants to read 16384 bytes
* schannel: encdata_buffer resized 17408
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: encrypted data got 85
* schannel: encrypted data buffer: offset 85 length 17408
* schannel: decrypted data length: 34
* schannel: decrypted data added: 34
* schannel: decrypted data cached: offset 34 length 16384
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: decrypted data buffer: offset 34 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 34
* schannel: decrypted data buffer: offset 0 length 16384
< 331 Please specify the password.
> PASS Password
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: encrypted data got 69
* schannel: encrypted data buffer: offset 69 length 17408
* schannel: decrypted data length: 23
* schannel: decrypted data added: 23
* schannel: decrypted data cached: offset 23 length 16384
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: decrypted data buffer: offset 23 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 23
* schannel: decrypted data buffer: offset 0 length 16384
< 230 Login successful.
> PBSZ 0
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: encrypted data got 69
* schannel: encrypted data buffer: offset 69 length 17408
* schannel: decrypted data length: 20
* schannel: decrypted data added: 20
* schannel: decrypted data cached: offset 20 length 16384
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: decrypted data buffer: offset 20 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 20
* schannel: decrypted data buffer: offset 0 length 16384
< 200 PBSZ set to 0.
> PROT P
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: encrypted data got 69
* schannel: encrypted data buffer: offset 69 length 17408
* schannel: decrypted data length: 23
* schannel: decrypted data added: 23
* schannel: decrypted data cached: offset 23 length 16384
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: decrypted data buffer: offset 23 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 23
* schannel: decrypted data buffer: offset 0 length 16384
< 200 PROT now Private.
> PWD
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: encrypted data got 53
* schannel: encrypted data buffer: offset 53 length 17408
* schannel: decrypted data length: 9
* schannel: decrypted data added: 9
* schannel: decrypted data cached: offset 9 length 16384
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: decrypted data buffer: offset 9 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 9
* schannel: decrypted data buffer: offset 0 length 16384
< 257 "/"
* Entry path is '/'
> CWD path
* ftp_perform ends with SECONDARY: 0
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: encrypted data got 85
* schannel: encrypted data buffer: offset 85 length 17408
* schannel: decrypted data length: 37
* schannel: decrypted data added: 37
* schannel: decrypted data cached: offset 37 length 16384
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: decrypted data buffer: offset 37 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 37
* schannel: decrypted data buffer: offset 0 length 16384
< 250 Directory successfully changed.
> CWD to
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: encrypted data got 85
* schannel: encrypted data buffer: offset 85 length 17408
* schannel: decrypted data length: 37
* schannel: decrypted data added: 37
* schannel: decrypted data cached: offset 37 length 16384
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: decrypted data buffer: offset 37 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 37
* schannel: decrypted data buffer: offset 0 length 16384
< 250 Directory successfully changed.
> EPSV
* Connect data stream passively
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: encrypted data got 101
* schannel: encrypted data buffer: offset 101 length 17408
* schannel: decrypted data length: 48
* schannel: decrypted data added: 48
* schannel: decrypted data cached: offset 48 length 16384
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: decrypted data buffer: offset 48 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 48
* schannel: decrypted data buffer: offset 0 length 16384
< 229 Entering Extended Passive Mode (|||1040|).
*   Trying my.ip.adress.here...
* TCP_NODELAY set
* Connecting to my.ip.adress.here (my.ip.adress.here) port 1040
* Connected to my.ip.adress.here (my.ip.adress.here) port 21 (#0)
> TYPE I
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: encrypted data got 85
* schannel: encrypted data buffer: offset 85 length 17408
* schannel: decrypted data length: 31
* schannel: decrypted data added: 31
* schannel: decrypted data cached: offset 31 length 16384
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: decrypted data buffer: offset 31 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 31
* schannel: decrypted data buffer: offset 0 length 16384
< 200 Switching to Binary mode.
> SIZE file.png
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: encrypted data got 53
* schannel: encrypted data buffer: offset 53 length 17408
* schannel: decrypted data length: 11
* schannel: decrypted data added: 11
* schannel: decrypted data cached: offset 11 length 16384
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: decrypted data buffer: offset 11 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 11
* schannel: decrypted data buffer: offset 0 length 16384
< 213 84381
> RETR file.png
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: encrypted data got 117
* schannel: encrypted data buffer: offset 117 length 17408
* schannel: decrypted data length: 68
* schannel: decrypted data added: 68
* schannel: decrypted data cached: offset 68 length 16384
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: decrypted data buffer: offset 68 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 68
* schannel: decrypted data buffer: offset 0 length 16384
< 150 Opening BINARY mode data connection for 001.png (84381 bytes).
* Maxdownload = -1
* Getting file with size: 84381
* Doing the SSL/TLS handshake on the data stream
* schannel: SSL/TLS connection with my.ip.adress.here port 21 (step 1/3)
* schannel: re-using existing credential handle
* schannel: incremented credential handle refcount = 3
* schannel: using IP address, SNI is not supported by OS.
* schannel: sending initial handshake data: sending 307 bytes...
* schannel: sent initial handshake data: sent 307 bytes
* schannel: SSL/TLS connection with my.ip.adress.here port 21 (step 2/3)
* schannel: failed to receive handshake, need more data
* schannel: SSL/TLS connection with my.ip.adress.here port 21 (step 2/3)
* schannel: encrypted data got 129
* schannel: encrypted data buffer: offset 129 length 4096
* schannel: sending next handshake data: sending 75 bytes...
* schannel: SSL/TLS handshake complete
* schannel: SSL/TLS connection with my.ip.adress.here port 21 (step 3/3)
* schannel: client wants to read 16384 bytes
* schannel: encdata_buffer resized 17408
* schannel: encrypted data buffer: offset 0 length 17408
* schannel: encrypted data got 10220
* schannel: encrypted data buffer: offset 10220 length 17408
* schannel: failed to decrypt data, need more data
* schannel: schannel_recv cleanup
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 10220 length 17408
* schannel: encrypted data got 4380
* schannel: encrypted data buffer: offset 14600 length 17408
* schannel: failed to decrypt data, need more data
* schannel: schannel_recv cleanup
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 14600 length 17408
* schannel: encrypted data got 1460
* schannel: encrypted data buffer: offset 16060 length 17408
* schannel: decrypted data length: 15872
* schannel: decrypted data added: 15872
* schannel: decrypted data cached: offset 15872 length 16384
* schannel: encrypted data length: 135
* schannel: encrypted data cached: offset 135 length 17408
* schannel: failed to decrypt data, need more data
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 15872
* schannel: decrypted data buffer: offset 0 length 16384
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 135 length 17408
* schannel: encrypted data got 16060
* schannel: encrypted data buffer: offset 16195 length 17408
* schannel: decrypted data length: 15872
* schannel: decrypted data added: 15872
* schannel: decrypted data cached: offset 15872 length 16384
* schannel: encrypted data length: 270
* schannel: encrypted data cached: offset 270 length 17408
* schannel: failed to decrypt data, need more data
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 15872
* schannel: decrypted data buffer: offset 0 length 16384
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 270 length 17408
* schannel: encrypted data got 16060
* schannel: encrypted data buffer: offset 16330 length 17408
* schannel: decrypted data length: 15872
* schannel: decrypted data added: 15872
* schannel: decrypted data cached: offset 15872 length 16384
* schannel: encrypted data length: 405
* schannel: encrypted data cached: offset 405 length 17408
* schannel: failed to decrypt data, need more data
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 15872
* schannel: decrypted data buffer: offset 0 length 16384
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 405 length 17408
* schannel: encrypted data got 14600
* schannel: encrypted data buffer: offset 15005 length 17408
* schannel: failed to decrypt data, need more data
* schannel: schannel_recv cleanup
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 15005 length 17408
* schannel: encrypted data got 2403
* schannel: encrypted data buffer: offset 17408 length 17408
* schannel: decrypted data length: 15872
* schannel: decrypted data added: 15872
* schannel: decrypted data cached: offset 15872 length 16384
* schannel: encrypted data length: 1483
* schannel: encrypted data cached: offset 1483 length 17408
* schannel: failed to decrypt data, need more data
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 15872
* schannel: decrypted data buffer: offset 0 length 16384
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 1483 length 17408
* schannel: encrypted data got 15925
* schannel: encrypted data buffer: offset 17408 length 17408
* schannel: decrypted data length: 2048
* schannel: decrypted data added: 2048
* schannel: decrypted data cached: offset 2048 length 16384
* schannel: encrypted data length: 15307
* schannel: encrypted data cached: offset 15307 length 17408
* schannel: failed to decrypt data, need more data
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 2048
* schannel: decrypted data buffer: offset 0 length 16384
* schannel: client wants to read 16384 bytes
* schannel: encrypted data buffer: offset 15307 length 17408
* schannel: encrypted data got 2101
* schannel: encrypted data buffer: offset 17408 length 17408
* schannel: decrypted data length: 16384
* schannel: decrypted data added: 16384
* schannel: decrypted data cached: offset 16384 length 16384
* schannel: encrypted data length: 971
* schannel: encrypted data cached: offset 971 length 17408
* schannel: encrypted data buffer: offset 971 length 17408
* schannel: decrypted data buffer: offset 16384 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 16384
* schannel: decrypted data buffer: offset 0 length 16384
* schannel: client wants to read 2461 bytes
* schannel: encrypted data buffer: offset 971 length 17408
* schannel: encrypted data got 1599
* schannel: encrypted data buffer: offset 2570 length 17408
* schannel: decrypted data length: 2461
* schannel: decrypted data added: 2461
* schannel: decrypted data cached: offset 2461 length 16384
* schannel: encrypted data length: 53
* schannel: encrypted data cached: offset 53 length 17408
* schannel: encrypted data buffer: offset 53 length 17408
* schannel: decrypted data buffer: offset 2461 length 16384
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 2461
* schannel: decrypted data buffer: offset 0 length 16384

同样，出于明显的原因，我用伪值替换了IP，用户名和密码。

注意：

HTTPS与方法3一起使用（未在方法2中尝试过，所以我不知道它是否有效）Curl在我的服务器和Google上成功执行了https get请求。
我假设问题出在我安装的curl或我的代码上，但是可能是因为我的服务器出现问题，因为我没有其他ftps服务器对其进行测试。我知道我可以通过Mac上的Curl以及Mac和Windows上的Filezilla从服务器上执行ftps操作。
我两次尝试了方法2，两次尝试了方法3。

如果我可以提供更多信息，请告诉我。多谢您的协助。如果一周后我能完成这项工作，我将感到非常高兴。

在Windows 10 Visual Studio 2017上为FTPS设置Curl

0 个答案: