cURL版本7.64上的curl_multi“无法解析主机”错误

问题描述 投票：1回答：1

当我在curl_multi上下文中调用curl_error($ch)时，我得到“无法解析主机”，但errno为0，请求也成功完成（我从远程服务器获得预期的响应）。

我收到了curl_multi组中所有请求的错误，除了它们的第一个请求，没有任何错误消息！

（例如，如果curl_multi附加了10个子请求，则只有第一个请求不会出错，而其他9个请求都会出错）

重现问题的代码

<?php
$url = "https://www.example.com";

$options = array(
    CURLOPT_RETURNTRANSFER => true,     // don't echo page
    CURLOPT_VERBOSE =>true,
);

$cm = curl_multi_init();


// step 1 of 3 (adding requests)

//request 1
$ch1 = curl_init( $url );
$verboseH1 = fopen('php://temp', 'w+');
$options[CURLOPT_STDERR] = $verboseH1;
curl_setopt_array( $ch1, $options);
curl_multi_add_handle($cm, $ch1);

//request 2
$ch2 = curl_init( $url );
$verboseH2 = fopen('php://temp', 'w+');
$options[CURLOPT_STDERR] = $verboseH2;
curl_setopt_array( $ch2, $options);
curl_multi_add_handle($cm, $ch2);

//request 3
$ch3 = curl_init( $url );
$verboseH3 = fopen('php://temp', 'w+');
$options[CURLOPT_STDERR] = $verboseH3;
curl_setopt_array( $ch3, $options);
curl_multi_add_handle($cm, $ch3);

// step 2 of 3 (executing requests in parallel)
// for more information about these strange loops , check http://php.net/manual/en/function.curl-multi-init.php#115055
$active = null;    
do {
    $mrc = curl_multi_exec($cm, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);

while ($active && $mrc == CURLM_OK) {
    if (curl_multi_select($cm) == -1) {
        usleep(100);
    }
    do {
        $mrc = curl_multi_exec($cm, $active);
    } while ($mrc == CURLM_CALL_MULTI_PERFORM);
}

// step 3 of 3 (getting results)
echo "<h1>Requet 1</h1>\n";
echo "errmsg1: '" .  curl_error($ch1) . "'\n";
rewind($verboseH1);
echo "verbose1:\n" .  stream_get_contents( $verboseH1) . "\n";

echo "===============================================================\n";
echo "<h1>Requet 2</h1>\n";
echo "errmsg2: '" .  curl_error($ch2) . "'\n";
rewind($verboseH2);
echo "verbose2:\n" .  stream_get_contents( $verboseH2) . "\n";

echo "===============================================================\n";
echo "<h1>Requet 3</h1>\n";
echo "errmsg3: '" .  curl_error($ch3) . "'\n";
rewind($verboseH3);
echo "verbose3:\n" .  stream_get_contents( $verboseH3) . "\n";

exit;

这段代码的输出

<h1>Requet 1</h1>
errmsg1: ''
verbose1:
* Expire in 0 ms for 6 (transfer 0x2b750f0)
* Expire in 1 ms for 1 (transfer 0x2b750f0)
* Expire in 0 ms for 1 (transfer 0x2b750f0)
* Expire in 0 ms for 1 (transfer 0x2b750f0)
*   Trying 93.184.216.34...
* TCP_NODELAY set
* Expire in 149999 ms for 3 (transfer 0x2b750f0)
* Expire in 200 ms for 4 (transfer 0x2b750f0)
* Connected to www.example.com (93.184.216.34) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* successfully set certificate verify locations:
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
* ALPN, server accepted to use h2
* Server certificate:
*  subject: C=US; ST=California; L=Los Angeles; O=Internet Corporation for Assigned Names and Numbers; OU=Technology; CN=www.example.org
*  start date: Nov 28 00:00:00 2018 GMT
*  expire date: Dec  2 12:00:00 2020 GMT
*  subjectAltName: host "www.example.com" matched cert's "www.example.com"
*  issuer: C=US; O=DigiCert Inc; CN=DigiCert SHA2 Secure Server CA
*  SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* Using Stream ID: 1 (easy handle 0x2b750f0)
> GET / HTTP/2
Host: www.example.com
Accept: */*

* Connection state changed (MAX_CONCURRENT_STREAMS == 100)!
< HTTP/2 200 
< cache-control: max-age=604800
< content-type: text/html; charset=UTF-8
< date: Tue, 19 Feb 2019 17:01:16 GMT
< etag: "1541025663+ident"
< expires: Tue, 26 Feb 2019 17:01:16 GMT
< last-modified: Fri, 09 Aug 2013 23:54:35 GMT
< server: ECS (dfw/27B2)
< vary: Accept-Encoding
< x-cache: HIT
< content-length: 1270
< 
* Connection #0 to host www.example.com left intact

===============================================================
<h1>Requet 2</h1>
errmsg2: 'Could not resolve host: www.example.com'
verbose2:
* Expire in 0 ms for 6 (transfer 0x2b7a9a0)
* Found bundle for host www.example.com: 0x2b86800 [serially]
* Server doesn't support multi-use (yet)
* Expire in 1 ms for 1 (transfer 0x2b7a9a0)
* Expire in 0 ms for 1 (transfer 0x2b7a9a0)
* Hostname 'www.example.com' was found in DNS cache
* Expire in 0 ms for 1 (transfer 0x2b7a9a0)
*   Trying 93.184.216.34...
* TCP_NODELAY set
* Expire in 149999 ms for 3 (transfer 0x2b7a9a0)
* Expire in 200 ms for 4 (transfer 0x2b7a9a0)
* Connected to www.example.com (93.184.216.34) port 443 (#1)
* ALPN, offering h2
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* successfully set certificate verify locations:
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
* ALPN, server accepted to use h2
* Server certificate:
*  subject: C=US; ST=California; L=Los Angeles; O=Internet Corporation for Assigned Names and Numbers; OU=Technology; CN=www.example.org
*  start date: Nov 28 00:00:00 2018 GMT
*  expire date: Dec  2 12:00:00 2020 GMT
*  subjectAltName: host "www.example.com" matched cert's "www.example.com"
*  issuer: C=US; O=DigiCert Inc; CN=DigiCert SHA2 Secure Server CA
*  SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* Using Stream ID: 1 (easy handle 0x2b7a9a0)
> GET / HTTP/2
Host: www.example.com
Accept: */*

* Connection state changed (MAX_CONCURRENT_STREAMS == 100)!
< HTTP/2 200 
< cache-control: max-age=604800
< content-type: text/html; charset=UTF-8
< date: Tue, 19 Feb 2019 17:01:16 GMT
< etag: "1541025663+ident"
< expires: Tue, 26 Feb 2019 17:01:16 GMT
< last-modified: Fri, 09 Aug 2013 23:54:35 GMT
< server: ECS (dfw/562D)
< vary: Accept-Encoding
< x-cache: HIT
< content-length: 1270
< 
* Could not resolve host: www.example.com
* Closing connection 1

===============================================================
<h1>Requet 3</h1>
errmsg3: 'Could not resolve host: www.example.com'
verbose3:
* Expire in 0 ms for 6 (transfer 0x2b80250)
* Found bundle for host www.example.com: 0x2b86800 [serially]
* Server doesn't support multi-use (yet)
* Expire in 1 ms for 1 (transfer 0x2b80250)
* Expire in 0 ms for 1 (transfer 0x2b80250)
* Hostname 'www.example.com' was found in DNS cache
* Expire in 0 ms for 1 (transfer 0x2b80250)
*   Trying 93.184.216.34...
* TCP_NODELAY set
* Expire in 150000 ms for 3 (transfer 0x2b80250)
* Expire in 200 ms for 4 (transfer 0x2b80250)
* Connected to www.example.com (93.184.216.34) port 443 (#2)
* ALPN, offering h2
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* successfully set certificate verify locations:
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
* ALPN, server accepted to use h2
* Server certificate:
*  subject: C=US; ST=California; L=Los Angeles; O=Internet Corporation for Assigned Names and Numbers; OU=Technology; CN=www.example.org
*  start date: Nov 28 00:00:00 2018 GMT
*  expire date: Dec  2 12:00:00 2020 GMT
*  subjectAltName: host "www.example.com" matched cert's "www.example.com"
*  issuer: C=US; O=DigiCert Inc; CN=DigiCert SHA2 Secure Server CA
*  SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* Using Stream ID: 1 (easy handle 0x2b80250)
> GET / HTTP/2
Host: www.example.com
Accept: */*

* Connection state changed (MAX_CONCURRENT_STREAMS == 100)!
< HTTP/2 200 
< accept-ranges: bytes
< cache-control: max-age=604800
< content-type: text/html; charset=UTF-8
< date: Tue, 19 Feb 2019 17:01:16 GMT
< etag: "1541025663"
< expires: Tue, 26 Feb 2019 17:01:16 GMT
< last-modified: Fri, 09 Aug 2013 23:54:35 GMT
< server: ECS (dfw/F4AA)
< vary: Accept-Encoding
< x-cache: HIT
< content-length: 1270
< 
* Could not resolve host: www.example.com
* Closing connection 2

正如您所看到的，只有第一个请求没有错误，请求2和3有错误“无法解析主机：www.example.com”并且具有与第一个请求不同的详细信息。

附加信息

  1. 这个问题发生在CentOS + PHP 7.0.33 + cURL 7.64.0（released : 6th of February 2019）
  2. 在fedora28 + PHP 7.2.14 + cURL 7.59.0上不会发生此问题
  3. 如果curl_multi只附加了1个请求，则不会发生此问题

请帮助我理解这种行为以及如何使所有请求像第一个请求一样，并且不会产生此错误？

UPDATE

将此行添加到$options数组中会修复问题中的特定示例，但这不是一个实际的解决方案，也无法解释为什么cURL无法自行解析名称。

CURLOPT_RESOLVE => ["www.example.com:443:93.184.216.34"]
php curl dns php-curl curl-multi
1个回答
3
投票

我有完全相同的问题：https://github.com/amazeeio/lagoon/issues/923

这是一个卷曲回归：https://github.com/curl/curl/issues/3629 - 自打开bug以来已经解决了。

谢谢你真棒测试脚本:)

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