/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* gnome-vfs-inet-connection.c - Functions for creating and destroying Internet
   connections.

   Copyright (C) 1999 Free Software Foundation

   The Gnome Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The Gnome 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the Gnome Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.

   Author: Ettore Perazzoli <ettore@gnu.org> */

#include <config.h>
#include "gnome-vfs-inet-connection.h"
#include "gnome-vfs-private-utils.h"

#include <errno.h>
#include <glib/gmem.h>
#include <glib/gmessages.h>
#include <string.h>
/* Keep <sys/types.h> above the network includes for FreeBSD. */
#include <sys/types.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>

extern int h_errno;

struct GnomeVFSInetConnection {
#ifdef ENABLE_IPV6
	struct sockaddr_in6 addr6;
#endif
	struct sockaddr_in addr;
	guint sock;
	guint socklen;
};

/**
 * gnome_vfs_inet_connection_create:
 * @connection_return: pointer to a GnomeVFSInetConnection, which will
 * contain an allocated GnomeVFSInetConnection object on return.
 * @host_name: string indicating the host to establish an internet connection with
 * @host_port: the port number to connect to
 * @cancellation: handle allowing cancellation of the operation
 *
 * Creates a connection at @handle_return to @host_name using
 * port @port.
 *
 * Return value: GnomeVFSResult indicating the success of the operation
 **/
GnomeVFSResult
gnome_vfs_inet_connection_create (GnomeVFSInetConnection **connection_return,
				  const gchar *host_name,
				  guint host_port,
				  GnomeVFSCancellation *cancellation)
{
	GnomeVFSInetConnection *new;
#ifdef ENABLE_IPV6
	struct addrinfo hints, *result, *res;
	int ret;
#endif
	struct hostent *host_info;
	struct sockaddr_in addr;
	gint sock;

	g_return_val_if_fail (connection_return != NULL, GNOME_VFS_ERROR_BAD_PARAMETERS);
	g_return_val_if_fail (host_name != NULL, GNOME_VFS_ERROR_BAD_PARAMETERS);
	g_return_val_if_fail (host_port != 0, GNOME_VFS_ERROR_BAD_PARAMETERS);

#ifdef ENABLE_IPV6
	if (_gnome_vfs_have_ipv6 ()) {
		result = NULL;
		ret = 0;
		sock = 0;

		memset (&hints, 0, sizeof (hints));
		hints.ai_socktype = SOCK_STREAM;

		if (getaddrinfo (host_name, NULL, &hints, &result) != 0) {
			return GNOME_VFS_ERROR_HOST_NOT_FOUND;
		}

		if (gnome_vfs_cancellation_check (cancellation)) {
			return GNOME_VFS_ERROR_CANCELLED;
		}

		/*For selecting a valid IP of the List*/
		for (res = result; res; res = res->ai_next) {

			if (res->ai_family != AF_INET && res->ai_family != AF_INET6) {
				continue;
			}

			sock = socket (res->ai_family, SOCK_STREAM, 0);
			if (sock < 0) {
				continue;
			}

			if (res->ai_family == AF_INET) {
				((struct sockaddr_in *)res->ai_addr)->sin_port = htons (host_port);
			}

			if (res->ai_family == AF_INET6) {
				((struct sockaddr_in6 *)res->ai_addr)->sin6_port = htons (host_port);
			}

			ret = connect (sock, res->ai_addr, res->ai_addrlen);
			if (ret == 0) {
				break;
			}

			close (sock);
		}

		if (!res) {
			freeaddrinfo (result);

			if (sock < 0 || ret < 0) {
				/*Error in connection or socket creation.*/
				return gnome_vfs_result_from_errno ();
			} else {
				/*Error: No IPv4 or IPv6 address.*/
				return GNOME_VFS_ERROR_HOST_NOT_FOUND;
			}
		}

		new = g_new (GnomeVFSInetConnection, 1);

		if (res->ai_family == AF_INET) { 
			memcpy (&new->addr, res->ai_addr, res->ai_addrlen);
		}

		if (res->ai_family == AF_INET6) {
			memcpy (&new->addr6, res->ai_addr, res->ai_addrlen);
		}

		new->socklen = res->ai_addrlen;
		new->sock = sock;
		freeaddrinfo (result);
	}
	else
#endif
	{
		sock = socket (PF_INET, SOCK_STREAM, 0);
		if (sock < 0) {
			return gnome_vfs_result_from_errno ();
		}

		host_info = gethostbyname (host_name);
		if (gnome_vfs_cancellation_check (cancellation)) {
			return GNOME_VFS_ERROR_CANCELLED;
		}

		if (host_info == NULL) {
			return gnome_vfs_result_from_h_errno ();
		}

		addr.sin_family = host_info->h_addrtype;
		addr.sin_addr = * (struct in_addr *) host_info->h_addr;
		addr.sin_port = htons (host_port);

		if (connect (sock, (struct sockaddr *) &addr, sizeof (addr)) < 0) {
			return gnome_vfs_result_from_errno ();
		}

		new = g_new (GnomeVFSInetConnection, 1);
		memcpy (&new->addr, &addr, sizeof (addr));
		new->socklen = sizeof(addr);
		new->sock = sock;

	}
	*connection_return = new;
	return GNOME_VFS_OK;
}


/**
 * gnome_vfs_inet_connection_destroy:
 * @connection: connection to destroy
 * @cancellation: handle for cancelling the operation
 *
 * Closes/Destroys @connection.
 **/
void
gnome_vfs_inet_connection_destroy (GnomeVFSInetConnection *connection,
				   GnomeVFSCancellation   *cancellation)
{
	g_return_if_fail (connection != NULL);

	close (connection->sock);
	g_free (connection);
}

/**
 * gnome_vfs_inet_connection_close:
 * @connection: connection to close
 *
 * Closes @connection, freeing all used resources.
 **/
static void
gnome_vfs_inet_connection_close (GnomeVFSInetConnection *connection)
{
	gnome_vfs_inet_connection_destroy (connection, NULL);
}

/**
 * gnome_vfs_inet_connection_get_fd:
 * @connection: connection to get the file descriptor from
 *
 * Retrieve the UNIX file descriptor corresponding to @connection.
 *
 * Return value: file descriptor
 **/
gint 
gnome_vfs_inet_connection_get_fd (GnomeVFSInetConnection *connection)
{
	g_return_val_if_fail (connection != NULL, -1);
	return connection->sock;
}

/* SocketImpl for InetConnections */

/**
 * gnome_vfs_inet_connection_read:
 * @connection: connection to read data from
 * @buffer: allocated buffer of at least @bytes bytes to be read into
 * @bytes: number of bytes to read from @socket into @buffer
 * @bytes_read: pointer to a GnomeVFSFileSize, will contain
 * the number of bytes actually read from the socket on return.
 *
 * Read @bytes bytes of data from @connection into @buffer.
 *
 * Return value: GnomeVFSResult indicating the success of the operation
 **/
static GnomeVFSResult 
gnome_vfs_inet_connection_read (GnomeVFSInetConnection *connection,
		                gpointer buffer,
		                GnomeVFSFileSize bytes,
		                GnomeVFSFileSize *bytes_read)
{
	gint read_val;

	do {
		read_val = read (connection->sock, buffer, bytes);
	} while (read_val == -1 && errno == EINTR);

	if (read_val == -1) {
		*bytes_read = 0;
		return gnome_vfs_result_from_errno ();
	} else {
		*bytes_read = read_val;
	}

	return bytes_read == 0 ? GNOME_VFS_ERROR_EOF : GNOME_VFS_OK;
}

/**
 * gnome_vfs_inet_connection_write:
 * @connection: connection to write data to
 * @buffer: data to write to the connection
 * @bytes: number of bytes from @buffer to write to @socket
 * @bytes_written: pointer to a GnomeVFSFileSize, will contain
 * the number of bytes actually written to the connection on return.
 *
 * Write @bytes bytes of data from @buffer to @connection.
 *
 * Return value: GnomeVFSResult indicating the success of the operation
 **/
static GnomeVFSResult 
gnome_vfs_inet_connection_write (GnomeVFSInetConnection *connection,
			         gconstpointer buffer,
			         GnomeVFSFileSize bytes,
			         GnomeVFSFileSize *bytes_written)
{
	gint write_val;

	do {
		write_val = write (connection->sock, buffer, bytes);
	} while (write_val == -1 && errno == EINTR);

	if (write_val == -1) {
		*bytes_written = 0;
		return gnome_vfs_result_from_errno ();
	} else {
		*bytes_written = write_val;
		return GNOME_VFS_OK;
	}
}

static GnomeVFSSocketImpl inet_connection_socket_impl = {
	(GnomeVFSSocketReadFunc)gnome_vfs_inet_connection_read,
	(GnomeVFSSocketWriteFunc)gnome_vfs_inet_connection_write,
	(GnomeVFSSocketCloseFunc)gnome_vfs_inet_connection_close
};

/**
 * gnome_vfs_inet_connection_to_socket:
 * @connection: connection to convert to wrapper in a GnomeVFSSocket
 *
 * Wrapper @connection inside a standard GnomeVFSSocket for convenience.
 *
 * Return value: a newly created GnomeVFSSocket around @connection.
 **/
GnomeVFSSocket *
gnome_vfs_inet_connection_to_socket (GnomeVFSInetConnection *connection)
{
	return gnome_vfs_socket_new (&inet_connection_socket_impl, connection);
}

/**
 * gnome_vfs_inet_connection_to_socket_buffer:
 * @connection: connection to convert to wrapper in a GnomeVFSSocketBuffer
 *
 * Wrapper @connection inside a standard GnomeVFSSocketBuffer for convenience.
 *
 * Return value: a newly created GnomeVFSSocketBuffer around @connection.
 **/
GnomeVFSSocketBuffer *
gnome_vfs_inet_connection_to_socket_buffer (GnomeVFSInetConnection *connection)
{
	GnomeVFSSocket *socket;
	socket = gnome_vfs_inet_connection_to_socket (connection);
	return gnome_vfs_socket_buffer_new (socket);
}