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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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33
src/network/connection.h
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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
@@ -34,10 +34,41 @@ struct net_connection
NET_CON_STRUCT_COMMON
};
struct net_connect_handle;
enum net_connect_status
{
net_connect_status_ok = 0,
net_connect_status_host_not_found = -1,
net_connect_status_no_address = -2,
net_connect_status_dns_error = -3,
net_connect_status_refused = -4,
net_connect_status_unreachable = -5,
net_connect_status_timeout = -6,
net_connect_status_socket_error = -7,
};
typedef void (*net_connect_cb)(struct net_connect_handle*, enum net_connect_status status, struct net_connection* con, void* ptr);
extern int net_con_get_sd(struct net_connection* con);
extern void* net_con_get_ptr(struct net_connection* con);
extern struct net_connection* net_con_create();
/**
* Establish an outbound TCP connection.
* This will resolve the IP-addresses, and connect to
* either an IPv4 or IPv6 address depending if it is supported,
* and using the happy eyeballs algorithm.
*
* @param address Hostname, IPv4 or IPv6 address
* @param port TCP port number
* @param callback A callback to be called once the connection is established, or failed.
* @returns a handle to the connection establishment job, or NULL if an immediate error.
*/
extern struct net_connect_handle* net_con_connect(const char* address, uint16_t port, net_connect_cb callback, void* ptr);
extern void net_connect_destroy(struct net_connect_handle* handle);
extern void net_con_destroy(struct net_connection*);
extern void net_con_initialize(struct net_connection* con, int sd, net_connection_cb callback, const void* ptr, int events);
extern void net_con_reinitialize(struct net_connection* con, net_connection_cb callback, const void* ptr, int events);