On Fri, 28 Jan 2011, Pavel Gushcha wrote:
I wrote application using curl_multi. This application must fetch each
second some fixed url, but each time from different ip (i have 20 ip on my
server). Firstly, i wrote application without requirement to use different
IPs and all works good. Then i added option to each curl easy handle before
adding it to curl_multi:
curl_easy_setopt(easy_handle,CURLOPT_INTERFACE,<next ip>)
And i expected, that this is all, what needed. But really ip was not
changing each request. It was changed around each 20 requests. After problem
exploration i figured out, that adding following option to easy handle fixes
the problem:
curl_easy_setopt(easy_handle,CURLOPT_FORBID_REUSE,1)
You've fallen into the same trap/bug/glitch that someone else did a short
while ago with pipelining and CURLOPT_INTERFACE: libcurl doesn't check the
desired source ip/port when it searches for a connection to re-use but is
happy if it targets the correct destination host.
This is a bug that should be fixed, and since you have a use-case here it
would be great if you could look into this.
The function that takes care of finding a connection to re-use is
lib/url.c:ConnectionExists().
PS: sorry for my bad english.
No problems at all, we can understand you perfectly!
--
/ daniel.haxx.se
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