dmap-share.c 56.4 KB
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/* Implmentation of DMAP (e.g., iTunes Music or iPhoto Picture) sharing
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 *
 * Copyright (C) 2005 Charles Schmidt <cschmidt2@emich.edu>
 *
 * Modifications Copyright (C) 2008 W. Michael Petullo <mike@flyn.org>
 *
 * 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; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include "config.h"

#include <time.h>
#include <string.h>
#include <stdlib.h>

#include <glib/gi18n.h>

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#include <libdmapsharing/dmap.h>
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#include <libdmapsharing/dmap-structure.h>

#define TYPE_OF_SERVICE "_daap._tcp"
#define STANDARD_DAAP_PORT 3689
#define STANDARD_DPAP_PORT 8770
#define DMAP_VERSION 2.0
#define DAAP_VERSION 3.0
#define DMAP_TIMEOUT 1800
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#define DMAP_STATUS_OK 200
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typedef enum {
	DMAP_SHARE_AUTH_METHOD_NONE              = 0,
	DMAP_SHARE_AUTH_METHOD_NAME_AND_PASSWORD = 1,
	DMAP_SHARE_AUTH_METHOD_PASSWORD          = 2
} DMAPShareAuthMethod;

enum {
	PROP_0,
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	/* I'd be nice to unify these, once libsoup supports it. See:
	 * http://mail.gnome.org/archives/libsoup-list/2011-January/msg00000.html
	 */
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	PROP_SERVER_IPV4,
	PROP_SERVER_IPV6,
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	PROP_NAME,
	PROP_PASSWORD,
	PROP_REVISION_NUMBER,
	PROP_AUTH_METHOD,
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	PROP_DB,
	PROP_CONTAINER_DB,
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	PROP_TRANSCODE_MIMETYPE,
	PROP_TXT_RECORDS
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};

struct DMAPSharePrivate {
	gchar *name;
	guint port;
	char *password;
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	/* FIXME: eventually, this should be determined dynamically, based
	 * on what client has connected and its supported mimetypes.
	 */
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	char *transcode_mimetype;
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	DMAPShareAuthMethod auth_method;

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	/* mDNS/DNS-SD publishing things */
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	gboolean server_active;
	gboolean published;
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	DMAPMdnsPublisher *publisher;
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	/* HTTP server things */
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	SoupServer *server_ipv4;
	SoupServer *server_ipv6;
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	guint revision_number;

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	/* The media database */
	DMAPDb *db;
	DMAPContainerDb *container_db;
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	/* TXT-RECORDS published by mDNS */
	gchar **txt_records;
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	GHashTable *session_ids;
};

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/* FIXME: name this something else, as it is more than just share/bitwise now */
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struct share_bitwise_t {
	DMAPShare *share;
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	SoupServer *server; /* Also in share, but we need to know whether server_ipv6 or _ipv4. */
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	struct MLCL_Bits mb;
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	GSList *id_list;
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	guint32 size;
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	/* FIXME: ick, void * is DMAPDDb * or GHashTable * 
	 * in next two fields:*/
	void *db;
	DMAPRecord *(*lookup_by_id) (void *db, guint id);

	void (*destroy) (void *);
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};

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static void dmap_share_init       (DMAPShare *share);
static void dmap_share_class_init (DMAPShareClass *klass);

G_DEFINE_ABSTRACT_TYPE (DMAPShare, dmap_share, G_TYPE_OBJECT)

#define DMAP_SHARE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), \
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				   DMAP_TYPE_SHARE, DMAPSharePrivate))
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static gboolean
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_dmap_share_soup_auth_callback (SoupAuthDomain *auth_domain,
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		    SoupMessage    *msg,
		    const char     *username,
		    gpointer        password,
		    DMAPShare    *share)
{
	gboolean    allowed;
	const char *path;

	path = soup_message_get_uri (msg)->path;
	g_debug ("Auth request for %s, user %s", path, username);

	allowed = !strcmp (password, share->priv->password);
	g_debug ("Auth request: %s", allowed ? "ALLOWED" : "DENIED");

	return allowed;
}

static void server_info_adapter (SoupServer *server,
				 SoupMessage *message,
				 const char *path,
				 GHashTable *query,
				 SoupClientContext *context,
				 DMAPShare *share)
{
	DMAP_SHARE_GET_CLASS (share)->server_info (share,
						   server,
						   message,
						   path,
						   query,
						   context);
}

static void content_codes_adapter (SoupServer *server,
				   SoupMessage *message,
				   const char *path,
				   GHashTable *query,
				   SoupClientContext *context,
				   DMAPShare *share)
{
	DMAP_SHARE_GET_CLASS (share)->content_codes (share,
						     server,
						     message,
						     path,
						     query,
						     context);
}

static void login_adapter (SoupServer *server,
			   SoupMessage *message,
			   const char *path,
			   GHashTable *query,
			   SoupClientContext *context,
			   DMAPShare *share)
{
	DMAP_SHARE_GET_CLASS (share)->login (share,
					     server,
					     message,
					     path,
					     query,
					     context);
}

static void logout_adapter (SoupServer *server,
			    SoupMessage *message,
			    const char *path,
			    GHashTable *query,
			    SoupClientContext *context,
			    DMAPShare *share)
{
	DMAP_SHARE_GET_CLASS (share)->logout (share,
					      server,
					      message,
					      path,
					      query,
					      context);
}

static void update_adapter (SoupServer *server,
			    SoupMessage *message,
			    const char *path,
			    GHashTable *query,
			    SoupClientContext *context,
			    DMAPShare *share)
{
	DMAP_SHARE_GET_CLASS (share)->update (share,
					      server,
					      message,
					      path,
					      query,
					      context);
}

static void databases_adapter (SoupServer *server,
			       SoupMessage *message,
			       const char *path,
			       GHashTable *query,
			       SoupClientContext *context,
			       DMAPShare *share)
{
	DMAP_SHARE_GET_CLASS (share)->databases (share,
						 server,
						 message,
						 path,
						 query,
						 context);
}

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static void ctrl_int_adapter (SoupServer *server,
                              SoupMessage *message,
                              const char *path,
                              GHashTable *query,
                              SoupClientContext *context,
                              DMAPShare *share)
{
	DMAP_SHARE_GET_CLASS (share)->ctrl_int (share,
	                                        server,
	                                        message,
	                                        path,
	                                        query,
	                                        context);
}

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static void
_dmap_share_server_setup_handlers (DMAPShare *share, SoupServer *server)
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{
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	gboolean password_required = (share->priv->auth_method != DMAP_SHARE_AUTH_METHOD_NONE);
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	if (password_required) {
		SoupAuthDomain *auth_domain;

		auth_domain = soup_auth_domain_basic_new (SOUP_AUTH_DOMAIN_REALM, "Music Sharing",
							  SOUP_AUTH_DOMAIN_ADD_PATH, "/login",
							  SOUP_AUTH_DOMAIN_ADD_PATH, "/update",
							  SOUP_AUTH_DOMAIN_ADD_PATH, "/database",
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							  SOUP_AUTH_DOMAIN_FILTER, _dmap_share_soup_auth_filter,
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							  NULL);
		soup_auth_domain_basic_set_auth_callback (auth_domain,
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							  (SoupAuthDomainBasicAuthCallback) _dmap_share_soup_auth_callback,
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							  g_object_ref (share),
							  g_object_unref);
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		soup_server_add_auth_domain (server, auth_domain);
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	}

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	soup_server_add_handler (server, "/server-info",
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				 (SoupServerCallback) server_info_adapter,
				 share, NULL);
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	soup_server_add_handler (server, "/content-codes",
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				 (SoupServerCallback) content_codes_adapter,
				 share, NULL);
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	soup_server_add_handler (server, "/login",
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				 (SoupServerCallback) login_adapter,
				 share, NULL);
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	soup_server_add_handler (server, "/logout",
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				 (SoupServerCallback) logout_adapter,
				 share, NULL);
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	soup_server_add_handler (server, "/update",
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				 (SoupServerCallback) update_adapter,
				 share, NULL);
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	soup_server_add_handler (server, "/databases",
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				 (SoupServerCallback) databases_adapter,
				 share, NULL);
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	soup_server_add_handler (server, "/ctrl-int",
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				 (SoupServerCallback) ctrl_int_adapter,
				 share, NULL);
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	soup_server_run_async (server);

}

gboolean
_dmap_share_server_start (DMAPShare *share)
{
	SoupAddress *addr;
	guint port = DMAP_SHARE_GET_CLASS (share)->get_desired_port (share);

	addr = soup_address_new_any (SOUP_ADDRESS_FAMILY_IPV6, port);
	share->priv->server_ipv6 = soup_server_new (SOUP_SERVER_INTERFACE, addr, NULL);
	g_object_unref (addr);

	/* NOTE: On Linux, opening a socket may give a IPv6-wrapped IPv4 address.
	 * in this case, the server_ipv6 object will service requests from both
	 * IPv6 and IPv4 clients.
	 */
	if (share->priv->server_ipv6 == NULL) {
		g_warning ("Unable to start music sharing server on port %d, trying any open port", port);
		addr = soup_address_new_any (SOUP_ADDRESS_FAMILY_IPV6, SOUP_ADDRESS_ANY_PORT);
		share->priv->server_ipv6 = soup_server_new (SOUP_SERVER_INTERFACE, addr, NULL);
		g_object_unref (addr);
	}

	if (share->priv->server_ipv6 != NULL) {
		/* Use same port for IPv4 as IPv6. */
		port = soup_server_get_port (share->priv->server_ipv6);
	} else {
		g_warning ("Unable to start music sharing server (IPv6)");
	}

	/* NOTE: In the case mentioned above, this will fail as the server_ipv6 is already
	 * servicing IPv4 requests. In this case server_ipv6 handles both IPv6 and IPv4
	 * and server_ipv4 is NULL.
	 */
	addr = soup_address_new_any (SOUP_ADDRESS_FAMILY_IPV4, port);
	share->priv->server_ipv4 = soup_server_new (SOUP_SERVER_INTERFACE, addr, NULL);
	g_object_unref (addr);

	/* Don't try any port on IPv4 unless IPv6 failed. We don't want to listen to one
	 * port on IPv6 and another on IPv4 */
	if (share->priv->server_ipv6 == NULL && share->priv->server_ipv4 == NULL) {
		g_warning ("Unable to start music sharing server on port %d, trying IPv4 only, any open port", port);
		addr = soup_address_new_any (SOUP_ADDRESS_FAMILY_IPV4, SOUP_ADDRESS_ANY_PORT);
		share->priv->server_ipv4 = soup_server_new (SOUP_SERVER_INTERFACE, addr, NULL);
		g_object_unref (addr);
	}

	if (share->priv->server_ipv4 == NULL) {
		g_warning ("Unable to start music sharing server (IPv4)");
		if (share->priv->server_ipv6 == NULL) {
			return FALSE;
		}
	}

	if (share->priv->server_ipv6)
		share->priv->port = (guint) soup_server_get_port (share->priv->server_ipv6);
	else
		share->priv->port = (guint) soup_server_get_port (share->priv->server_ipv4);
	g_debug ("Started DMAP server on port %u (IPv6: %s, explicit IPv4: %s)",
		  share->priv->port,
		  share->priv->server_ipv6 ? "yes" : "no",
		  share->priv->server_ipv4 ? "yes" : "no");

	if (share->priv->server_ipv6)
		_dmap_share_server_setup_handlers (share, share->priv->server_ipv6);

	if (share->priv->server_ipv4)
		_dmap_share_server_setup_handlers (share, share->priv->server_ipv4);
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	/* using direct since there is no g_uint_hash or g_uint_equal */
	share->priv->session_ids = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, g_free);

	share->priv->server_active = TRUE;

	return TRUE;
}

static gboolean
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_dmap_share_server_stop (DMAPShare *share)
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{
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W. Michael Petullo committed
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	g_debug ("Stopping music sharing server on port %d", share->priv->port);
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	if (share->priv->server_ipv4) {
		soup_server_quit (share->priv->server_ipv4);
		g_object_unref (share->priv->server_ipv4);
		share->priv->server_ipv4 = NULL;
	}

	if (share->priv->server_ipv6) {
		soup_server_quit (share->priv->server_ipv6);
		g_object_unref (share->priv->server_ipv6);
		share->priv->server_ipv6 = NULL;
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	}

	if (share->priv->session_ids) {
		g_hash_table_destroy (share->priv->session_ids);
		share->priv->session_ids = NULL;
	}

	share->priv->server_active = FALSE;

	return TRUE;
}

gboolean
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_dmap_share_publish_start (DMAPShare *share)
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{
	gchar *nameprop;
	GError  *error;
	gboolean res;
	gboolean password_required;

	/* FIXME: this is done throughout dmap-share.c. Is this the best way? */
	g_object_get ((gpointer) share, "name", &nameprop, NULL);

	password_required = (share->priv->auth_method != DMAP_SHARE_AUTH_METHOD_NONE);

	error = NULL;
	res = dmap_mdns_publisher_publish (share->priv->publisher,
					      nameprop,
					      share->priv->port,
					      DMAP_SHARE_GET_CLASS (share)->get_type_of_service (share),
					      password_required,
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					      share->priv->txt_records,
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					      &error);

	if (res == FALSE) {
		if (error != NULL) {
			g_warning ("Unable to notify network of media sharing: %s", error->message);
			g_error_free (error);
		} else {
			g_warning ("Unable to notify network of media sharing");
		}
		return FALSE;
	} else {
		g_debug ("Published DMAP server information to mdns");
	}

	g_free (nameprop);

	return TRUE;
}

static gboolean
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_dmap_share_publish_stop (DMAPShare *share)
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{
	if (share->priv->publisher) {
		gboolean res;
		GError  *error;
		error = NULL;
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		res = dmap_mdns_publisher_withdraw (share->priv->publisher, share->priv->port, &error);
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		if (error != NULL) {
			g_warning ("Unable to withdraw music sharing service: %s", error->message);
			g_error_free (error);
		}
		return res;
	}

	share->priv->published = FALSE;
	return TRUE;
}

static void
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_dmap_share_restart (DMAPShare *share)
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{
	gboolean res;

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	_dmap_share_server_stop (share);
	res = _dmap_share_server_start (share);
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	if (res) {
		/* To update information just publish again */
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		_dmap_share_publish_start (share);
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	} else {
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		_dmap_share_publish_stop (share);
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	}
}

static void
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_dmap_share_maybe_restart (DMAPShare *share)
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{
	if (share->priv->published) {
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		_dmap_share_restart (share);
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	}
}

static void
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_dmap_share_set_name (DMAPShare *share, const char  *name)
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{
	GError *error;
	gboolean res;

	g_return_if_fail (share != NULL);

	g_free (share->priv->name);
	share->priv->name = g_strdup (name);

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	if (share->priv->published) {
		error = NULL;
		res = dmap_mdns_publisher_rename_at_port (share->priv->publisher,
							  share->priv->port,
							  name,
							 &error);
		if (error != NULL) {
			g_warning ("Unable to change MDNS service name: %s",
				   error->message);
			g_error_free (error);
		}
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	}
}

static void
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_dmap_share_set_password (DMAPShare *share, const char  *password)
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{
	g_return_if_fail (share != NULL);

	if (share->priv->password && password &&
	    strcmp (password, share->priv->password) == 0) {
		return;
	}

	g_free (share->priv->password);
	share->priv->password = g_strdup (password);
	if (password != NULL) {
		share->priv->auth_method = DMAP_SHARE_AUTH_METHOD_PASSWORD;
	} else {
		share->priv->auth_method = DMAP_SHARE_AUTH_METHOD_NONE;
	}

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	_dmap_share_maybe_restart (share);
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}

static void
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_dmap_share_set_property (GObject *object,
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			 guint prop_id,
			 const GValue *value,
			 GParamSpec *pspec)
{
	DMAPShare *share = DMAP_SHARE (object);

	switch (prop_id) {
	case PROP_NAME:
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		_dmap_share_set_name (share, g_value_get_string (value));
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		break;
	case PROP_PASSWORD:
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		_dmap_share_set_password (share, g_value_get_string (value));
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		break;
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	case PROP_DB:
                share->priv->db = (DMAPDb *) g_value_get_pointer (value);
                break;
        case PROP_CONTAINER_DB:
                share->priv->container_db = (DMAPContainerDb *) g_value_get_pointer (value);
                break;
        case PROP_TRANSCODE_MIMETYPE:
		/* FIXME: get or dup? */
                share->priv->transcode_mimetype = g_value_dup_string (value);
                break;
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        case PROP_TXT_RECORDS:
                share->priv->txt_records = g_value_dup_boxed (value);
                break;
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	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
		break;
	}
}

static void
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_dmap_share_get_property (GObject *object,
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			 guint prop_id,
			 GValue *value,
			 GParamSpec *pspec)
{
	DMAPShare *share = DMAP_SHARE (object);

	switch (prop_id) {
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	case PROP_SERVER_IPV4:
		g_value_set_object (value, share->priv->server_ipv4);
		return;
	case PROP_SERVER_IPV6:
		g_value_set_object (value, share->priv->server_ipv6);
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		return;
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	case PROP_NAME:
		g_value_set_string (value, share->priv->name);
		break;
	case PROP_PASSWORD:
		g_value_set_string (value, share->priv->password);
		break;
	case PROP_REVISION_NUMBER:
		g_value_set_uint (value,
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				  _dmap_share_get_revision_number
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					(DMAP_SHARE (object)));
		break;
	case PROP_AUTH_METHOD:
		g_value_set_uint (value,
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				  _dmap_share_get_auth_method
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					(DMAP_SHARE (object)));
		break;
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	case PROP_DB:
                g_value_set_pointer (value, share->priv->db);
                break;
        case PROP_CONTAINER_DB:
                g_value_set_pointer (value, share->priv->container_db);
                break;
        case PROP_TRANSCODE_MIMETYPE:
                g_value_set_string (value, share->priv->transcode_mimetype);
                break;
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        case PROP_TXT_RECORDS:
                g_value_set_boxed (value, share->priv->txt_records);
                break;
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	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
		break;
	}
}

static void
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_dmap_share_finalize (GObject *object)
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{
	DMAPShare *share = DMAP_SHARE (object);

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	g_debug ("Finalizing DMAPShare");

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	if (share->priv->published) {
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		_dmap_share_publish_stop (share);
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	}

	if (share->priv->server_active) {
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		_dmap_share_server_stop (share);
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	}

	g_free (share->priv->name);
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	g_free (share->priv->password);

	g_object_unref (share->priv->db);
	g_object_unref (share->priv->container_db);
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	g_strfreev (share->priv->txt_records);
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	if (share->priv->publisher) {
		g_object_unref (share->priv->publisher);
	}

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	G_OBJECT_CLASS (dmap_share_parent_class)->finalize (object);
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}

static void
dmap_share_class_init (DMAPShareClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);

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	object_class->get_property = _dmap_share_get_property;
	object_class->set_property = _dmap_share_set_property;
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	object_class->finalize     = _dmap_share_finalize;
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	/* Pure virtual methods: */
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	klass->get_desired_port     = NULL;
	klass->get_type_of_service  = NULL;
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	klass->message_add_standard_headers = NULL;
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	klass->get_meta_data_map    = NULL;
	klass->add_entry_to_mlcl    = NULL;
	klass->databases_browse_xxx = NULL;
	klass->databases_items_xxx  = NULL;
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	/* Virtual methods: */
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	klass->content_codes  = _dmap_share_content_codes;
	klass->login          = _dmap_share_login;
	klass->logout         = _dmap_share_logout;
	klass->update         = _dmap_share_update;
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	klass->published      = _dmap_share_published;
	klass->name_collision = _dmap_share_name_collision;
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	klass->databases      = _dmap_share_databases;
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	klass->ctrl_int       = _dmap_share_ctrl_int;
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	g_object_class_install_property (object_class,
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					 PROP_SERVER_IPV4,
					 g_param_spec_object ("server-ipv4",
							      "Soup Server",
							      "Soup server",
							      SOUP_TYPE_SERVER,
							      G_PARAM_READABLE));
	
	g_object_class_install_property (object_class,
					 PROP_SERVER_IPV6,
					 g_param_spec_object ("server-ipv6",
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							      "Soup Server",
							      "Soup server",
							      SOUP_TYPE_SERVER,
							      G_PARAM_READABLE));
	
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	g_object_class_install_property (object_class,
					 PROP_NAME,
					 g_param_spec_string ("name",
						 	    "Name",
							    "Share Name",
							    NULL,
							    G_PARAM_READWRITE));
	g_object_class_install_property (object_class,
					 PROP_PASSWORD,
					 g_param_spec_string ("password",
						      "Authentication password",
						      "Authentication password",
						      NULL,
						      G_PARAM_READWRITE));

	g_object_class_install_property (object_class,
					 PROP_REVISION_NUMBER,
					 g_param_spec_uint ("revision_number",
					 		    "Revision number",
							    "Revision number",
							    0,
							    G_MAXINT,
							    0,
							    G_PARAM_READWRITE));

	g_object_class_install_property (object_class,
					 PROP_AUTH_METHOD,
					 g_param_spec_uint ("auth_method",
					 	"Authentication method",
						"Authentication method",
						DMAP_SHARE_AUTH_METHOD_NONE,
						DMAP_SHARE_AUTH_METHOD_PASSWORD,
						0,
						G_PARAM_READWRITE));
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	g_object_class_install_property (object_class,
                                         PROP_DB,
                                         g_param_spec_pointer ("db",
                                                              "DB",
                                                              "DB object",
                                                               G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));

        g_object_class_install_property (object_class,
                                         PROP_CONTAINER_DB,
                                         g_param_spec_pointer ("container-db",
                                                              "Container DB",
                                                              "Container DB object",
                                                               G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
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	g_object_class_install_property (object_class,
                                         PROP_TRANSCODE_MIMETYPE,
                                         g_param_spec_string ("transcode-mimetype",
                                                             "Transcode mimetype",
                                                             "Set mimetype of stream after transcoding",
                                                             NULL,
                                                             G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
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	g_object_class_install_property (object_class,
                                         PROP_TXT_RECORDS,
                                         g_param_spec_boxed ("txt-records",
                                                             "TXT-Records",
                                                             "Set TXT-Records used for MDNS publishing",
                                                             G_TYPE_STRV,
                                                             G_PARAM_READWRITE));
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	g_type_class_add_private (klass, sizeof (DMAPSharePrivate));
}

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static void published_adapter (DMAPMdnsPublisher *publisher,
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			       const char          *name,
			       DMAPShare         *share)
{
	DMAP_SHARE_GET_CLASS (share)->published (share, publisher, name);
}

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static void name_collision_adapter (DMAPMdnsPublisher *publisher,
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				    const char          *name,
				    DMAPShare         *share)
{
	DMAP_SHARE_GET_CLASS (share)->name_collision (share, publisher, name);
}

static void
dmap_share_init (DMAPShare *share)
{
	share->priv = DMAP_SHARE_GET_PRIVATE (share);

	share->priv->revision_number = 5;
	share->priv->auth_method = DMAP_SHARE_AUTH_METHOD_NONE;
	share->priv->publisher = dmap_mdns_publisher_new ();

	g_signal_connect_object (share->priv->publisher,
				 "published",
				 G_CALLBACK (published_adapter),
				 share, 0);
	g_signal_connect_object (share->priv->publisher,
				 "name-collision",
				 G_CALLBACK (name_collision_adapter),
				 share, 0);
}

guint
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_dmap_share_get_auth_method (DMAPShare *share)
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{
	return share->priv->auth_method;
}

guint
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_dmap_share_get_revision_number (DMAPShare *share)
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{
	return share->priv->revision_number;
}



static gboolean
get_session_id (GHashTable *query,
		guint32    *id)
{
	char *session_id_str;
	guint32 session_id;

	session_id_str = g_hash_table_lookup (query, "session-id");
	if (session_id_str == NULL) {
		g_warning ("Session id not found.");
		return FALSE;
	}

	session_id = (guint32) strtoul (session_id_str, NULL, 10);
	if (id != NULL) {
		*id = session_id;
	}
	return TRUE;
}

gboolean
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_dmap_share_get_revision_number_from_query (GHashTable *query,
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		     guint *number)
{
	char *revision_number_str;
	guint revision_number;

	revision_number_str = g_hash_table_lookup (query, "revision-number");
	if (revision_number_str == NULL) {
		g_warning ("Client asked for an update without a rev. number");
		return FALSE;
	}

	revision_number = strtoul (revision_number_str, NULL, 10);
	if (number != NULL) {
		*number = revision_number;
	}
	return TRUE;
}

gboolean
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_dmap_share_session_id_validate (DMAPShare       *share,
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		     SoupClientContext *context,
		     SoupMessage       *message,
		     GHashTable        *query,
		     guint32           *id)
{
	guint32     session_id;
	gboolean    res;
	const char *addr;
	const char *remote_address;

	if (id) {
		*id = 0;
	}

	res = get_session_id (query, &session_id);
	if (! res) {
		g_warning ("Validation failed: Unable to parse session id");
		return FALSE;
	}

	/* check hash for remote address */
	addr = g_hash_table_lookup (share->priv->session_ids,
				    GUINT_TO_POINTER (session_id));
	if (addr == NULL) {
		g_warning ("Validation failed: Unable to lookup session id %u",
			   session_id);
		return FALSE;
	}

	remote_address = soup_client_context_get_host (context);
	g_debug ("Validating session id %u from %s matches %s",
		  session_id, remote_address, addr);
	if (remote_address == NULL || strcmp (addr, remote_address) != 0) {
		g_warning ("Validation failed: Remote address does not match stored address");
		return FALSE;
	}

	if (id) {
		*id = session_id;
	}

	return TRUE;
}

static guint32
session_id_generate (DMAPShare       *share,
		     SoupClientContext *context)
{
	guint32 id;

	id = g_random_int ();

	return id;
}

guint32
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_dmap_share_session_id_create (DMAPShare       *share,
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		   SoupClientContext *context)
{
	guint32     id;
	const char *addr;
	char       *remote_address;

	do {
		/* create a unique session id */
		id = session_id_generate (share, context);
		g_debug ("Generated session id %u", id);

		/* if already used, try again */
		addr = g_hash_table_lookup (share->priv->session_ids,
					    GUINT_TO_POINTER (id));
	} while	(addr != NULL);

	/* store session id and remote address */
	remote_address = g_strdup (soup_client_context_get_host (context));
	g_hash_table_insert (share->priv->session_ids, GUINT_TO_POINTER (id),
			     remote_address);

	return id;
}

void
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_dmap_share_session_id_remove (DMAPShare       *share,
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		   SoupClientContext *context,
		   guint32            id)
{
	g_hash_table_remove (share->priv->session_ids, GUINT_TO_POINTER (id));
}

void
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_dmap_share_message_set_from_dmap_structure (DMAPShare *share,
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					    SoupMessage *message,
				    	    GNode *structure)
{
	gchar *resp;
	guint length;

	resp = dmap_structure_serialize (structure, &length);

	if (resp == NULL) {
		g_warning ("Serialize gave us null?\n");
		return;
	}

	soup_message_set_response (message, "application/x-dmap-tagged",
				   SOUP_MEMORY_TAKE, resp, length);

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	DMAP_SHARE_GET_CLASS (share)->message_add_standard_headers (share,
								    message);
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	soup_message_set_status (message, SOUP_STATUS_OK);
}


gboolean
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_dmap_share_client_requested (bitwise bits,
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		  gint field)
{
	return 0 != (bits & (((bitwise) 1) << field));
}

gboolean
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_dmap_share_uri_is_local (const char *text_uri)
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{
        return g_str_has_prefix (text_uri, "file://");
}

gboolean
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_dmap_share_soup_auth_filter (SoupAuthDomain *auth_domain,
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		  SoupMessage    *msg,
		  gpointer        user_data)
{
	const char *path;

	path = soup_message_get_uri (msg)->path;
	if (g_str_has_prefix (path, "/databases/")) {
		/* Subdirectories of /databases don't actually require
		 * authentication
		 */
		return FALSE;
	} else {
		/* Everything else in auth_domain's paths, including
		 * /databases itself, does require auth.
		 */
		return TRUE;
	}
}

void
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_dmap_share_published (DMAPShare         *share,
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		      DMAPMdnsPublisher *publisher,
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		      const char        *name)
{
	gchar *nameprop;

	g_object_get ((gpointer) share, "name", &nameprop, NULL);

        if (nameprop == NULL || name == NULL) {
		g_free (nameprop);
                return;
        }

        if (strcmp (nameprop, name) == 0) {
                g_debug ("mDNS publish successful");
                share->priv->published = TRUE;
        }

	g_free (nameprop);
}

void
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_dmap_share_name_collision (DMAPShare         *share,
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			   DMAPMdnsPublisher *publisher,
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			   const char        *name)
{
	gchar *nameprop;
        char *new_name = "FIXME";

	g_object_get ((gpointer) share, "name", &nameprop, NULL);

        if (nameprop == NULL || name == NULL) {
		g_free (nameprop);
                return;
        }

        if (strcmp (nameprop, name) == 0) {
                g_warning ("Duplicate share name on mDNS");

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                _dmap_share_set_name (DMAP_SHARE(share), new_name);
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                g_free (new_name);
        }

	g_free (nameprop);

        return;
}

void
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_dmap_share_content_codes (DMAPShare *share,
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		  SoupServer        *server,
		  SoupMessage       *message,
		  const char        *path,
		  GHashTable        *query,
		  SoupClientContext *context)
{
/* MCCR content codes response
 * 	MSTT status
 * 	MDCL dictionary
 * 		MCNM content codes number
 * 		MCNA content codes name
 * 		MCTY content codes type
 * 	MDCL dictionary
 * 	...
 */
	const DMAPContentCodeDefinition *defs;
	guint num_defs = 0;
	guint i;
	GNode *mccr;

	g_debug ("Path is %s.", path);

	defs = dmap_content_codes (&num_defs);

	mccr = dmap_structure_add (NULL, DMAP_CC_MCCR);
	dmap_structure_add (mccr, DMAP_CC_MSTT, (gint32) DMAP_STATUS_OK);

	for (i = 0; i < num_defs; i++) {
		GNode *mdcl;

		mdcl = dmap_structure_add (mccr, DMAP_CC_MDCL);
		dmap_structure_add (mdcl, DMAP_CC_MCNM, dmap_content_code_string_as_int32(defs[i].string));
		dmap_structure_add (mdcl, DMAP_CC_MCNA, defs[i].name);
		dmap_structure_add (mdcl, DMAP_CC_MCTY, (gint32) defs[i].type);
	}

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	_dmap_share_message_set_from_dmap_structure (share, message, mccr);
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	dmap_structure_destroy (mccr);
}

void
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_dmap_share_login (DMAPShare *share,
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	  SoupServer        *server,
	  SoupMessage       *message,
	  const char        *path,
	  GHashTable        *query,
	  SoupClientContext *context)
{
/* MLOG login response
 * 	MSTT status
 * 	MLID session id
 */
	GNode *mlog;
	guint32 session_id;

	g_debug ("Path is %s.", path);

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	session_id = _dmap_share_session_id_create (share, context);
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	mlog = dmap_structure_add (NULL, DMAP_CC_MLOG);
	dmap_structure_add (mlog, DMAP_CC_MSTT, (gint32) DMAP_STATUS_OK);
	dmap_structure_add (mlog, DMAP_CC_MLID, session_id);

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	_dmap_share_message_set_from_dmap_structure (share, message, mlog);
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	dmap_structure_destroy (mlog);
}

void
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_dmap_share_logout (DMAPShare *share,
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	   SoupServer        *server,
	   SoupMessage       *message,
	   const char        *path,
	   GHashTable        *query,
	   SoupClientContext *context)
{
	int     status;
	guint32 id;

	g_debug ("Path is %s.", path);

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	if (_dmap_share_session_id_validate (share, context, message, query, &id)) {
		_dmap_share_session_id_remove (share, context, id);
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		status = SOUP_STATUS_NO_CONTENT;
	} else {
		status = SOUP_STATUS_FORBIDDEN;
	}

	soup_message_set_status (message, status);
}

void
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_dmap_share_update (DMAPShare *share,
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	   SoupServer        *server,
	   SoupMessage       *message,
	   const char        *path,
	   GHashTable        *query,
	   SoupClientContext *context)
{
	guint    revision_number;
	gboolean res;

	g_debug ("Path is %s.", path);

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	res = _dmap_share_get_revision_number_from_query (query, &revision_number);
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	if (res && revision_number != _dmap_share_get_revision_number (share)) {
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		/* MUPD update response
		 * 	MSTT status
		 * 	MUSR server revision
		 */
		GNode *mupd;

		mupd = dmap_structure_add (NULL, DMAP_CC_MUPD);
		dmap_structure_add (mupd, DMAP_CC_MSTT, (gint32) DMAP_STATUS_OK);
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		dmap_structure_add (mupd, DMAP_CC_MUSR, (gint32) _dmap_share_get_revision_number (share));
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		_dmap_share_message_set_from_dmap_structure (share, message, mupd);
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		dmap_structure_destroy (mupd);
	} else {
		/* FIXME: This seems like a bug. It just leaks the
		 * message (and socket) without ever replying.
		 */
		g_object_ref (message);
		soup_server_pause_message (server, message);
	}
}

bitwise
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_dmap_share_parse_meta_str (const char *attrs, struct DMAPMetaDataMap *mdm)
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{
	guint i;
	bitwise bits = 0;

	/* iTunes 8 uses meta=all for /databases/1/items query: */
	if (strcmp (attrs, "all") == 0) {
		bits = ~0;
	} else {
		gchar **attrsv;
	
		attrsv = g_strsplit (attrs, ",", -1);

		for (i = 0; attrsv[i]; i++) {
			guint j;
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			gboolean found = FALSE;
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			for (j = 0; mdm[j].tag; j++) {
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				if (strcmp (mdm[j].tag, attrsv[i]) == 0) {
					bits |= (((bitwise) 1) << mdm[j].md);
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					found = TRUE;
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				}
			}
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			if (found == FALSE)
				g_debug ("Unknown meta request: %s", attrsv[i]);
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		}
		g_strfreev (attrsv);
	}	

	return bits;
}

bitwise
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_dmap_share_parse_meta (GHashTable *query, struct DMAPMetaDataMap *mdm)
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{
	const gchar *attrs;

	attrs = g_hash_table_lookup (query, "meta");
	if (attrs == NULL) {
		return 0;
	}
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	return _dmap_share_parse_meta_str (attrs, mdm);
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}

void
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_dmap_share_add_playlist_to_mlcl (gpointer id, DMAPContainerRecord *record, gpointer _mb)
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{
	/* MLIT listing item
	 * MIID item id
	 * MPER persistent item id
	 * MINM item name
	 * MIMC item count
	 */
	GNode *mlit;
	guint num_songs;
	gchar *name;
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	struct MLCL_Bits *mb = (struct MLCL_Bits *) _mb;
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	num_songs = dmap_container_record_get_entry_count (record);
	g_object_get (record, "name", &name, NULL);

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	/* FIXME: ITEM_ID, etc. is defined in DAAPShare, so I can't use
	 * with _dmap_share_client_requested() here (see add_entry_to_mlcl())
	 */

	mlit = dmap_structure_add (mb->mlcl, DMAP_CC_MLIT);
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	dmap_structure_add (mlit, DMAP_CC_MIID, dmap_container_record_get_id (record));
	/* we don't have a persistant ID for playlists, unfortunately */
	dmap_structure_add (mlit, DMAP_CC_MPER, (gint64) dmap_container_record_get_id (record));
	dmap_structure_add (mlit, DMAP_CC_MINM, name);
	dmap_structure_add (mlit, DMAP_CC_MIMC, (gint32) num_songs);

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	/* FIXME: Is this getting music-specific? */
	dmap_structure_add (mlit, DMAP_CC_FQUESCH, 0);
	dmap_structure_add (mlit, DMAP_CC_MPCO, 0);
	dmap_structure_add (mlit, DMAP_CC_AESP, 0);
	dmap_structure_add (mlit, DMAP_CC_AEPP, 0);
	dmap_structure_add (mlit, DMAP_CC_AEPS, 0);
	dmap_structure_add (mlit, DMAP_CC_AESG, 0);

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	g_free (name);

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	return;
} 
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GSList *
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_dmap_share_build_filter (gchar *filterstr)
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{
	/* Produces a list of lists, each being a filter definition that may
	 * be one or more filter criteria.
	 */

	/* A filter string looks like (iTunes):
	 * 'daap.songgenre:Other'+'daap.songartist:Band'.
	 * or (Roku):
	 * 'daap.songgenre:Other' 'daap.songartist:Band'.
	 * or
         * 'dmap.itemid:1000'
	 * or
         * 'dmap.itemid:1000','dmap:itemid:1001'
	 * or
	 * 'daap.songgenre:Foo'+'daap.songartist:Bar'+'daap.songalbum:Baz'
	 * or (iPhoto '09)
	 * ('daap.idemid:1000','dmap:itemid:1001')
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	 * or (DACP):
	 * ('com.apple.itunes.mediakind:1','com.apple.itunes.mediakind:32') 'daap.songartist!:'
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         */

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	gchar *next_char;
	GString *value;
	//gboolean save_value;
	gboolean is_key;
	gboolean is_value;
	gboolean new_group;
	gboolean accept;
	gboolean negate;
	gint parentheses_count;
	gint quotes_count;
	FilterDefinition *def;
	
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	GSList *list = NULL;
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	GSList *filter = NULL;
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	g_debug ("Filter string is %s.", filterstr);

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	if (filterstr == NULL)
		return NULL;
	
	next_char = filterstr;
	
	parentheses_count = 0;
	quotes_count = 0;
	is_key = TRUE;
	is_value = FALSE;
	new_group = FALSE;
	negate = FALSE;
	value = NULL;
	def = NULL;
	
	// The query string is divided in groups of AND separated by a space,
	// each group containing queries of OR separated by comma enclosed in
	// parentheses. Queries are key, value pairs separated by ':' enclosed 
	// in quotes or not.
	// The result from this is a list of lists. Here is an example:
	// String is ('com.apple.itunes.mediakind:1','com.apple.itunes.mediakind:32') 'daap.songartist!:'
	// list:
	// |-> filter1: -> com.apple.itunes.mediakind = 1
	// |   |        -> com.apple.itunes.mediakind = 32
	// |-> filter1: -> daap.songartist! = (null)
	// This basically means that the query is (filter1 AND filter2), and
	// filter1 is (com.apple.itunes.mediakind = 1) OR (com.apple.itunes.mediakind = 32)
	while (TRUE) {
		// We check each character to see if it should be included in
		// the current value (the current value will become the query key
		// or the query value). Anything that is not a special character
		// handled below will be accepted (this means weird characters
		// might appear in names).
		// Handling of unicode characters is unknown, but as long it 
		// doesn't appear as a character handled below, it will be
		// included.
		// This parser will result in unknown behaviour on bad-formatted
		// queries (it does not check for syntax errors), but should not 
		// crash. In this way it may accept much more syntaxes then
		// other parsers.
		accept = FALSE;
		// A slash can escape characters such as ', so add the character
		// after the slash.
		if (*next_char == '\\') {
			accept = TRUE;
			next_char++;
		} else {
			switch (*next_char) {
				case '(':
1336 1337 1338 1339 1340
					if (is_value) {
						accept = TRUE;
					} else {
						parentheses_count++;
					}
1341 1342
					break;
				case ')':
1343 1344 1345 1346 1347
					if (is_value) {
						accept = TRUE;
					} else {
						parentheses_count--;
					}
1348 1349 1350 1351 1352 1353 1354 1355 1356
					break;
				case '\'':
					if (quotes_count > 0) {
						quotes_count = 0;
					} else {
						quotes_count = 1;
					}
					break;
				case ' ':
1357
					if (is_value) {
1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372
						accept = TRUE;
					} else {
						new_group = TRUE;
					}
					break;
				case ':':
					// Inside values, they will be included in the 
					// query string, otherwise it indicates there
					// will be a value next.
					if (is_value) {
						accept = TRUE;
					} else if (is_key) {
						is_value = TRUE;
					}
					break;
1373 1374 1375 1376 1377 1378 1379
				case '!':
					if (is_value) {
						accept = TRUE;
					} else if (is_key && value) {
						negate = TRUE;
					}
					break;
1380 1381
				case ',':
				case '+':
1382 1383 1384 1385 1386
					// Accept these characters only if inside quotes
					if (is_value) {
						accept = TRUE;
					}
					break;
1387
				case '\0':
1388
					// Never accept
1389 1390 1391
					break;
				default:
					accept = TRUE;
1392
					break;
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			}
		}
		//g_debug ("Char: %c, Accept: %s", *next_char, accept?"TRUE":"FALSE");
		//Is the next character to be accepted?
		if (accept) {
			if (!value) {
				value = g_string_new ("");
			}
			g_string_append_c (value, *next_char);
		} else if (value != NULL && *next_char != '!') {
			// If we won't accept this character, we are ending a 
			// query key or value, so we should save them in a new
			// FilterDefinition. If is_value is TRUE, we will still
			// parse the query value, so we must keep our def around.
			// Otherwise, save it in the list of filters.
			if (!def) {
1409
				def = g_new0 (FilterDefinition, 1);