Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was closed and archived. Please ask a new question if you need help.

dns prefetch question

  • No replies
  • 1 has this problem
  • 1 view
613038475
613038475
more options

locking as a duplicate of https://support.mozilla.org/en-US/questions/989798

Since nobody will anwser question about bug of dns prefetch, so I pick this title.

Firefox will do dns prefetch direct even user use http proxy or socks5 proxy with remote_dns setting.

And cannot disable by network.dns.disablePrefetch.

Here is the bug report 2 years ago.

https://support.mozilla.org/en-US/questions/928722

I check some source code of firefox 27.0.1:

network.dns.disablePrefetch affect places

nsDNSService2.cpp 

       1. prefs->GetBoolPref(kPrefDisablePrefetch, &disablePrefetch);

       2. mDisablePrefetch = disablePrefetch || (proxyType == nsIProtocolProxyService::PROXYCONFIG_MANUAL);

3. nsDNSService::GetPrefetchEnabled(bool *outVal) { *outVal = !mDisablePrefetch; return NS_OK; } But no other places use method GetPrefetchEnabled


actual handle of dns prefetch nsDocShell.cpp 1. mAllowDNSPrefetch(true),

2. can turn off with header mAllowDNSPrefetch = aData.IsEmpty() || aData.LowerCaseEqualsLiteral("on"); can turn off with https if (aNewPrincipal && mAllowDNSPrefetch && sDisablePrefetchHTTPSPref) { nsDocument.cpp

3. load from docshell docShell->GetAllowDNSPrefetch(&allowDNSPrefetch);


Looks network.dns.disablePrefetch and network.dns.disablePrefetchHttps has absolutely no effect,

network.dns.disablePrefetch always false and network.dns.disablePrefetchHttps always true.

And here is a photo show how dangers use firefox with proxy.

http://imgur.com/yssHmkW

Also dns prefetch is disabled anyway on linux(ubuntu) and macosx (10.8).

I don't known why mozilla leave this bug will put many guy in dangerous 2 years .

''locking as a duplicate of https://support.mozilla.org/en-US/questions/989798'' Since nobody will anwser question about bug of dns prefetch, so I pick this title. Firefox will do dns prefetch direct even user use http proxy or socks5 proxy with remote_dns setting. And cannot disable by network.dns.disablePrefetch. Here is the bug report 2 years ago. https://support.mozilla.org/en-US/questions/928722 I check some source code of firefox 27.0.1: network.dns.disablePrefetch affect places nsDNSService2.cpp 1. prefs->GetBoolPref(kPrefDisablePrefetch, &disablePrefetch); 2. mDisablePrefetch = disablePrefetch || (proxyType == nsIProtocolProxyService::PROXYCONFIG_MANUAL); 3. nsDNSService::GetPrefetchEnabled(bool *outVal) { *outVal = !mDisablePrefetch; return NS_OK; } But no other places use method GetPrefetchEnabled actual handle of dns prefetch nsDocShell.cpp 1. mAllowDNSPrefetch(true), 2. can turn off with header mAllowDNSPrefetch = aData.IsEmpty() || aData.LowerCaseEqualsLiteral("on"); can turn off with https if (aNewPrincipal && mAllowDNSPrefetch && sDisablePrefetchHTTPSPref) { nsDocument.cpp 3. load from docshell docShell->GetAllowDNSPrefetch(&allowDNSPrefetch); Looks network.dns.disablePrefetch and network.dns.disablePrefetchHttps has absolutely no effect, network.dns.disablePrefetch always false and network.dns.disablePrefetchHttps always true. And here is a photo show how dangers use firefox with proxy. http://imgur.com/yssHmkW Also dns prefetch is disabled anyway on linux(ubuntu) and macosx (10.8). I don't known why mozilla leave this bug will put many guy in dangerous 2 years .

Modified by the-edmeister