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resolve: add CURLOPT_DNS_SHUFFLE_ADDRESSES

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This patch adds CURLOPT_DNS_SHUFFLE_ADDRESSES to explicitly request
shuffling of IP addresses returned for a hostname when there is more
than one. This is useful when the application knows that a round robin
approach is appropriate and is willing to accept the consequences of
potentially discarding some preference order returned by the system's
implementation.

Closes #1694
This commit is contained in:
Rick Deist 2018-03-17 20:10:04 +01:00 • committed by Daniel Stenberg
parent fb4f568b1e
commit d95f3dc0b1
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14 changed files with 270 additions and 3 deletions
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13
lib/hostip.h
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@ -7,7 +7,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -182,6 +182,17 @@ struct Curl_dns_entry *
Curl_fetch_addr(struct connectdata *conn,
const char *hostname,
int port);
/*
* Curl_shuffle_addr() shuffles the order of addresses in a 'Curl_addrinfo'
* struct by re-linking its linked list.
*
* The addr argument should be the address of a pointer to the head node of a
* `Curl_addrinfo` list and it will be modified to point to the new head after
* shuffling.
*/
CURLcode Curl_shuffle_addr(struct Curl_easy *data, Curl_addrinfo **addr);
/*
* Curl_cache_addr() stores a 'Curl_addrinfo' struct in the DNS cache.
*