-----Original Message----- From: curl-library [mailto:[email protected]] On Behalf Of ext Dan Fandrich Sent: April-16-13 2:04 PM To: [email protected] Subject: Re: libcurl + c-ares on Android
On Tue, Apr 16, 2013 at 06:34:55PM +0000, [email protected] wrote: > I'm using libcurl 7.29.0 on Android with c-ares 1.9.1. > > I've been noticing a bug on a Samsung Galaxy S3 & Samsung Galaxy Note 2 (and > possibly other devices too) when the bearer switches from wifi to 3G where I > can no longer connect to a host. > > If I undefine USE_ARES (build without c-ares) then this issue is gone, but I > would like to keep c-ares for performance. > > Some other (useful?) info: > 1) Switching back to the original bearer will allow a connection again > 2) I tried performing a curl_global_cleanup() and > curl_global_init(CURL_GLOBAL_ALL) during the switch, but it didn't seem to > help. > > If anyone knows of anything that I can do to continue to use c-ares I would > greatly appreciate it! I'm guessing here based on little information that you've given, but I suspect that it has to do with changing DNS hosts. c-ares uses the Android means of specifying DNS servers (i.e. not /etc/resolv.conf) but it initializes them once at startup time and never again (for both Android and /etc/resolv.conf). There's a TODO item in c-ares to add a ares_reinit() function to allow the application to force it to update itself with new DNS servers but at the moment, about all you can do is tear down c-ares and initialize it from scratch if this happens. >>> Dan ------------------------------------------------------------------- List admin: http://cool.haxx.se/list/listinfo/curl-library Etiquette: http://curl.haxx.se/mail/etiquette.html Thanks Dan. As it turns out, calling curl_easy_init() and curl_easy_destroy() does fix the issue as you mentioned. Thanks for pointing out the TODO in c-ares; I will be watching that one closely :) For the record, if anyone else is looking for the current DNS servers on Android (since you so kindly pointed out they're not in /etc/resolv.conf) they can be viewed with: adb shell getprop | grep net.dns Cheers, Jon ------------------------------------------------------------------- List admin: http://cool.haxx.se/list/listinfo/curl-library Etiquette: http://curl.haxx.se/mail/etiquette.html
