/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010-2018 Andy Green <andy@warmcat.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation:
 *  version 2.1 of the License.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA  02110-1301  USA
 *
 * included from libwebsockets.h
 */

/** \defgroup net Network related helper APIs
 * ##Network related helper APIs
 *
 * These wrap miscellaneous useful network-related functions
 */
///@{

/**
 * lws_canonical_hostname() - returns this host's hostname
 *
 * This is typically used by client code to fill in the host parameter
 * when making a client connection.  You can only call it after the context
 * has been created.
 *
 * \param context:	Websocket context
 */
LWS_VISIBLE LWS_EXTERN const char * LWS_WARN_UNUSED_RESULT
lws_canonical_hostname(struct lws_context *context);

/**
 * lws_get_peer_addresses() - Get client address information
 * \param wsi:	Local struct lws associated with
 * \param fd:		Connection socket descriptor
 * \param name:	Buffer to take client address name
 * \param name_len:	Length of client address name buffer
 * \param rip:	Buffer to take client address IP dotted quad
 * \param rip_len:	Length of client address IP buffer
 *
 *	This function fills in name and rip with the name and IP of
 *	the client connected with socket descriptor fd.  Names may be
 *	truncated if there is not enough room.  If either cannot be
 *	determined, they will be returned as valid zero-length strings.
 */
LWS_VISIBLE LWS_EXTERN void
lws_get_peer_addresses(struct lws *wsi, lws_sockfd_type fd, char *name,
		       int name_len, char *rip, int rip_len);

/**
 * lws_get_peer_simple() - Get client address information without RDNS
 *
 * \param wsi:	Local struct lws associated with
 * \param name:	Buffer to take client address name
 * \param namelen:	Length of client address name buffer
 *
 * This provides a 123.123.123.123 type IP address in name from the
 * peer that has connected to wsi
 */
LWS_VISIBLE LWS_EXTERN const char *
lws_get_peer_simple(struct lws *wsi, char *name, int namelen);

#define LWS_ITOSA_USABLE	0
#define LWS_ITOSA_NOT_EXIST	-1
#define LWS_ITOSA_NOT_USABLE	-2
#define LWS_ITOSA_BUSY		-3 /* only returned by lws_socket_bind() on
					EADDRINUSE */

#if !defined(LWS_WITH_ESP32) && !defined(LWS_PLAT_OPTEE)
/**
 * lws_interface_to_sa() - Convert interface name or IP to sockaddr struct
 *
 * \param ipv6:		Allow IPV6 addresses
 * \param ifname:	Interface name or IP
 * \param addr:		struct sockaddr_in * to be written
 * \param addrlen:	Length of addr
 *
 * This converts a textual network interface name to a sockaddr usable by
 * other network functions.
 *
 * If the network interface doesn't exist, it will return LWS_ITOSA_NOT_EXIST.
 *
 * If the network interface is not usable, eg ethernet cable is removed, it
 * may logically exist but not have any IP address.  As such it will return
 * LWS_ITOSA_NOT_USABLE.
 *
 * If the network interface exists and is usable, it will return
 * LWS_ITOSA_USABLE.
 */
LWS_VISIBLE LWS_EXTERN int
lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
		    size_t addrlen);
#endif
///@}