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我目前正在使用 ArchLinux 4.7.2-1 x86_64 服务器并尝试使用 libcurl 为 HTTP(S) 请求编写应用程序。所以例如我做这样的事情：

#include <curl/curl.h>

int main(void)
{
    CURL* curl_handle = curl_easy_init();
    curl_easy_setopt(curl_handle, CURLOPT_URL, "https://google.at");
    curl_easy_setopt(curl_handle, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTPS | CURLPROTO_HTTP);
    curl_easy_setopt(curl_handle, CURLOPT_FOLLOWLOCATION, 1L);
    curl_easy_setopt(curl_handle, CURLOPT_VERBOSE, 1L);
    curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)");
    curl_easy_perform(curl_handle);
    curl_easy_cleanup(curl_handle);
    return 0;
}

我知道我必须指定一个 WriteFunction 来接收响应正文，但这不是问题。只要响应不包含重定向 URL，一切都很好。但是当涉及到 (HTTPS) 时，会重定向 OpenSSL 内部的一些中断。

* Rebuilt URL to: https://google.at/
*   Trying 172.217.21.99...
* Connected to google.at (172.217.21.99) port 443 (#0)
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
  CApath: none
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
* ALPN, server accepted to use http/1.1
* Server certificate:
*  subject: C=US; ST=California; L=Mountain View; O=Google Inc; CN=*.google.at
*  start date: Aug 24 10:10:00 2016 GMT
*  expire date: Nov 16 10:10:00 2016 GMT
*  subjectAltName: host "google.at" matched cert's "google.at"
*  issuer: C=US; O=Google Inc; CN=Google Internet Authority G2
*  SSL certificate verify ok.
> GET / HTTP/1.1
Host: google.at
User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)
Accept: */*

< HTTP/1.1 301 Moved Permanently
< Location: https://www.google.at/
< Content-Type: text/html; charset=UTF-8
< Date: Fri, 02 Sep 2016 11:42:53 GMT
< Expires: Sun, 02 Oct 2016 11:42:53 GMT
< Cache-Control: public, max-age=2592000
< Server: gws
< Content-Length: 219
< X-XSS-Protection: 1; mode=block
< X-Frame-Options: SAMEORIGIN
< Alt-Svc: quic=":443"; ma=2592000; v="36,35,34,33,32,31,30"
<
* Ignoring the response-body
* Connection #0 to host google.at left intact
* Issue another request to this URL: 'https://www.google.at/'
*   Trying 216.58.201.163...
* Connected to www.google.at (216.58.201.163) port 443 (#1)
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH

ElectricFence Exiting: mprotect() failed: Cannot allocate memory

顺便提一句。我在用

  • OpenSSL 1.0.2g
  • 电子围栏 2.2.0
  • libcurl 7.49.1
  • zlib 1.2.8
  • g++ 6.1.1

有谁知道导致这个问题的原因并有解决方案吗？如果我忘记了重要信息，请随时询问。

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1 回答 1

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为了摆脱这个错误，我按照了解电栅栏和 gdb 的输出中提供的说明进行操作：

echo 128000 > /proc/sys/vm/max_map_count

增加内存映射区域来128000做到这一点。

于 2016-09-05T08:37:56.797 回答