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Created a connection establishment API.

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This API provides transparent asynchronous DNS lookups
with both IPv4 and IPv6 support, and in addition will try
to connect to all addresses until one of them work.

This implements the "happy eyeballs" algorithm provided that the client supports IPv6
and that the DNS records provides both IPv6 and IPv4 addresses.
This commit is contained in:
Jan Vidar Krey
2013-02-05 22:40:20 +01:00
parent 4d438e1e90
commit 92b65a0e14
4 changed files with 404 additions and 9 deletions
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13
src/network/dnsresolver.c
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@@ -1,6 +1,6 @@
/*
* uhub - A tiny ADC p2p connection hub
* Copyright (C) 2007-2012, Jan Vidar Krey
* Copyright (C) 2007-2013, Jan Vidar Krey
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -366,21 +366,24 @@ extern size_t net_dns_result_size(const struct net_dns_result* res)
extern struct ip_addr_encap* net_dns_result_first(const struct net_dns_result* res)
{
struct ip_addr_encap* ipaddr = list_get_first(res->addr_list);
LOG_TRACE("net_dns_result_first() - Address: %s", ip_convert_to_string(ipaddr));
LOG_TRACE("net_dns_result_first() - Address: %s", ipaddr ? ip_convert_to_string(ipaddr) : "(no address)");
return ipaddr;
}
extern struct ip_addr_encap* net_dns_result_next(const struct net_dns_result* res)
{
struct ip_addr_encap* ipaddr = list_get_next(res->addr_list);
LOG_TRACE("net_dns_result_next() - Address: %s", ip_convert_to_string(ipaddr));
LOG_TRACE("net_dns_result_next() - Address: %s", ipaddr ? ip_convert_to_string(ipaddr) : "(no more addresses)");
return ipaddr;
}
extern void net_dns_result_free(struct net_dns_result* res)
extern void net_dns_result_free(const struct net_dns_result* res)
{
if (!res)
return;
list_clear(res->addr_list, &hub_free);
list_destroy(res->addr_list);
free_job(res->job);
hub_free(res);
hub_free((struct net_dns_result*) res);
}