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dbus-protocol.c

/* $Id$ */

/***
  This file is part of avahi.
 
  avahi 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.
 
  avahi 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 avahi; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>

#include <dbus/dbus.h>

#include <avahi-common/dbus.h>
#include <avahi-common/llist.h>
#include <avahi-common/malloc.h>
#include <avahi-common/dbus-watch-glue.h>
#include <avahi-common/alternative.h>
#include <avahi-common/error.h>
#include <avahi-common/domain.h>
#include <avahi-common/timeval.h>

#include <avahi-core/log.h>
#include <avahi-core/core.h>
#include <avahi-core/lookup.h>
#include <avahi-core/publish.h>

#include "dbus-protocol.h"
#include "dbus-util.h"
#include "dbus-internal.h"
#include "main.h"

/* #define VALGRIND_WORKAROUND 1 */

#define RECONNECT_MSEC 3000

Server *server = NULL;

static int disable_user_service_publishing = 0;

static int dbus_connect(void);
static void dbus_disconnect(void);

static void client_free(Client *c) {
    
    assert(server);
    assert(c);

    while (c->entry_groups)
        avahi_dbus_entry_group_free(c->entry_groups);

    while (c->sync_host_name_resolvers)
        avahi_dbus_sync_host_name_resolver_free(c->sync_host_name_resolvers);

    while (c->async_host_name_resolvers)
        avahi_dbus_async_host_name_resolver_free(c->async_host_name_resolvers);
    
    while (c->sync_address_resolvers)
        avahi_dbus_sync_address_resolver_free(c->sync_address_resolvers);

    while (c->async_address_resolvers)
        avahi_dbus_async_address_resolver_free(c->async_address_resolvers);

    while (c->domain_browsers)
        avahi_dbus_domain_browser_free(c->domain_browsers);

    while (c->service_type_browsers)
        avahi_dbus_service_type_browser_free(c->service_type_browsers);

    while (c->service_browsers)
        avahi_dbus_service_browser_free(c->service_browsers);

    while (c->sync_service_resolvers)
        avahi_dbus_sync_service_resolver_free(c->sync_service_resolvers);

    while (c->async_service_resolvers)
        avahi_dbus_async_service_resolver_free(c->async_service_resolvers);

    while (c->record_browsers)
        avahi_dbus_record_browser_free(c->record_browsers);

    assert(c->n_objects == 0);
    
    avahi_free(c->name);
    AVAHI_LLIST_REMOVE(Client, clients, server->clients, c);
    avahi_free(c);

    server->n_clients --;
    assert(server->n_clients >= 0);
}

static Client *client_get(const char *name, int create) {
    Client *client;

    assert(server);
    assert(name);

    for (client = server->clients; client; client = client->clients_next)
        if (!strcmp(name, client->name))
            return client;

    if (!create)
        return NULL;

    if (server->n_clients >= CLIENTS_MAX)
        return NULL;
    
    /* If not existent yet, create a new entry */
    client = avahi_new(Client, 1);
    client->id = server->current_id++;
    client->name = avahi_strdup(name);
    client->current_id = 0;
    client->n_objects = 0;
    
    AVAHI_LLIST_HEAD_INIT(EntryGroupInfo, client->entry_groups);
    AVAHI_LLIST_HEAD_INIT(SyncHostNameResolverInfo, client->sync_host_name_resolvers);
    AVAHI_LLIST_HEAD_INIT(AsyncHostNameResolverInfo, client->async_host_name_resolvers);
    AVAHI_LLIST_HEAD_INIT(SyncAddressResolverInfo, client->sync_address_resolvers);
    AVAHI_LLIST_HEAD_INIT(AsyncAddressResolverInfo, client->async_address_resolvers);
    AVAHI_LLIST_HEAD_INIT(DomainBrowserInfo, client->domain_browsers);
    AVAHI_LLIST_HEAD_INIT(ServiceTypeBrowserInfo, client->service_type_browsers);
    AVAHI_LLIST_HEAD_INIT(ServiceBrowserInfo, client->service_browsers);
    AVAHI_LLIST_HEAD_INIT(SyncServiceResolverInfo, client->sync_service_resolvers);
    AVAHI_LLIST_HEAD_INIT(AsyncServiceResolverInfo, client->async_service_resolvers);
    AVAHI_LLIST_HEAD_INIT(RecordBrowserInfo, client->record_browsers);

    AVAHI_LLIST_PREPEND(Client, clients, server->clients, client);

    server->n_clients++;
    assert(server->n_clients > 0);
    
    return client;
}

static void reconnect_callback(AvahiTimeout *t, AVAHI_GCC_UNUSED void *userdata) {
    assert(!server->bus);

    if (dbus_connect() < 0) {
        struct timeval tv;
        avahi_log_debug(__FILE__": Connection failed, retrying in %ims...", RECONNECT_MSEC);
        avahi_elapse_time(&tv, RECONNECT_MSEC, 0);
        server->poll_api->timeout_update(t, &tv);
    } else {
        avahi_log_debug(__FILE__": Successfully reconnected.");
        server->poll_api->timeout_update(t, NULL);
    }
}

static DBusHandlerResult msg_signal_filter_impl(AVAHI_GCC_UNUSED DBusConnection *c, DBusMessage *m, AVAHI_GCC_UNUSED void *userdata) {
    DBusError error;

    dbus_error_init(&error);

/*     avahi_log_debug(__FILE__": interface=%s, path=%s, member=%s", */
/*                     dbus_message_get_interface(m), */
/*                     dbus_message_get_path(m), */
/*                     dbus_message_get_member(m)); */

    if (dbus_message_is_signal(m, DBUS_INTERFACE_LOCAL, "Disconnected")) {
        struct timeval tv;

        if (server->reconnect) {
            avahi_log_warn("Disconnected from D-Bus, trying to reconnect in %ims...", RECONNECT_MSEC);
            
            dbus_disconnect();
            
            avahi_elapse_time(&tv, RECONNECT_MSEC, 0);
            
            if (server->reconnect_timeout)
                server->poll_api->timeout_update(server->reconnect_timeout, &tv);
            else
                server->reconnect_timeout = server->poll_api->timeout_new(server->poll_api, &tv, reconnect_callback, NULL);
        } else {
            avahi_log_warn("Disconnected from D-Bus, exiting.");
            raise(SIGQUIT);
        }
            
        return DBUS_HANDLER_RESULT_HANDLED;
        
    } else if (dbus_message_is_signal(m, DBUS_INTERFACE_DBUS, "NameAcquired")) {
        char *name;

        if (!dbus_message_get_args(m, &error, DBUS_TYPE_STRING, &name, DBUS_TYPE_INVALID)) {
            avahi_log_warn("Error parsing NameAcquired message");
            goto fail;
        }

/*         avahi_log_info(__FILE__": name acquired (%s)", name); */
        return DBUS_HANDLER_RESULT_HANDLED;
        
    } else if (dbus_message_is_signal(m, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
        char *name, *old, *new;

        if (!dbus_message_get_args(m, &error, DBUS_TYPE_STRING, &name, DBUS_TYPE_STRING, &old, DBUS_TYPE_STRING, &new, DBUS_TYPE_INVALID)) {
            avahi_log_warn("Error parsing NameOwnerChanged message");
            goto fail;
        }

        if (!*new) {
            Client *client;

            if ((client = client_get(name, FALSE))) {
                avahi_log_debug(__FILE__": client %s vanished.", name); 
                client_free(client);
            }
        }
    }

fail:
    if (dbus_error_is_set(&error))
        dbus_error_free(&error);
    
    return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}

static DBusHandlerResult msg_server_impl(DBusConnection *c, DBusMessage *m, AVAHI_GCC_UNUSED void *userdata) {
    DBusError error;

    dbus_error_init(&error);

    avahi_log_debug(__FILE__": interface=%s, path=%s, member=%s",
                    dbus_message_get_interface(m),
                    dbus_message_get_path(m),
                    dbus_message_get_member(m));

    if (dbus_message_is_method_call(m, DBUS_INTERFACE_INTROSPECTABLE, "Introspect"))
        return avahi_dbus_handle_introspect(c, m, "Server.introspect");
        
    else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "GetHostName")) {

        if (!dbus_message_get_args(m, &error, DBUS_TYPE_INVALID)) {
            avahi_log_warn("Error parsing Server::GetHostName message");
            goto fail;
        }

        return avahi_dbus_respond_string(c, m, avahi_server_get_host_name(avahi_server));
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "SetHostName")) {

        char *name;
        
        if (!dbus_message_get_args(m, &error, DBUS_TYPE_STRING, &name, DBUS_TYPE_INVALID)) {
            avahi_log_warn("Error parsing Server::SetHostName message");
            goto fail;
        }
        
        if (avahi_server_set_host_name(avahi_server, name) < 0) 
            return avahi_dbus_respond_error(c, m, avahi_server_errno(avahi_server), NULL);

        avahi_log_info("Changing host name to '%s'.", name);
        
        return avahi_dbus_respond_ok(c, m);
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "GetDomainName")) {

        if (!dbus_message_get_args(m, &error, DBUS_TYPE_INVALID)) {
            avahi_log_warn("Error parsing Server::GetDomainName message");
            goto fail;
        }

        return avahi_dbus_respond_string(c, m, avahi_server_get_domain_name(avahi_server));

    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "GetHostNameFqdn")) {

        if (!(dbus_message_get_args(m, &error, DBUS_TYPE_INVALID))) {
            avahi_log_warn("Error parsing Server::GetHostNameFqdn message");
            goto fail;
        }
    
        return avahi_dbus_respond_string(c, m, avahi_server_get_host_name_fqdn(avahi_server));
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "IsNSSSupportAvailable")) {
        if (!(dbus_message_get_args(m, &error, DBUS_TYPE_INVALID))) {
            avahi_log_warn("Error parsing Server::IsNSSSupportAvailable message");
            goto fail;
        }

        return avahi_dbus_respond_boolean(c, m, nss_support);
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "GetVersionString")) {

        if (!(dbus_message_get_args(m, &error, DBUS_TYPE_INVALID))) {
            avahi_log_warn("Error parsing Server::GetVersionString message");
            goto fail;
        }
    
        return avahi_dbus_respond_string(c, m, PACKAGE_STRING);

    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "GetAPIVersion")) {

        if (!(dbus_message_get_args(m, &error, DBUS_TYPE_INVALID))) {
            avahi_log_warn("Error parsing Server::GetAPIVersion message");
            goto fail;
        }
    
        return avahi_dbus_respond_uint32(c, m, AVAHI_DBUS_API_VERSION);

    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "GetState")) {
        AvahiServerState state;
        
        if (!(dbus_message_get_args(m, &error, DBUS_TYPE_INVALID))) {
            avahi_log_warn("Error parsing Server::GetState message");
            goto fail;
        }
        
        state = avahi_server_get_state(avahi_server);
        return avahi_dbus_respond_int32(c, m, (int32_t) state);

    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "GetLocalServiceCookie")) {

        if (!(dbus_message_get_args(m, &error, DBUS_TYPE_INVALID))) {
            avahi_log_warn("Error parsing Server::GetLocalServiceCookie message");
            goto fail;
        }
        
        return avahi_dbus_respond_uint32(c, m, avahi_server_get_local_service_cookie(avahi_server));

    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "GetNetworkInterfaceNameByIndex")) {
        int32_t idx;
      char name[IF_NAMESIZE];
        
        if (!(dbus_message_get_args(m, &error, DBUS_TYPE_INT32, &idx, DBUS_TYPE_INVALID))) {
            avahi_log_warn("Error parsing Server::GetNetworkInterfaceNameByIndex message");
            goto fail;
        }

#ifdef VALGRIND_WORKAROUND
        return respond_string(c, m, "blah");
#else
        if ((!if_indextoname(idx, name))) {
            char txt[256];
            snprintf(txt, sizeof(txt), "OS Error: %s", strerror(errno));
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_OS, txt);
        }
        
        return avahi_dbus_respond_string(c, m, name);
#endif
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "GetNetworkInterfaceIndexByName")) {
        char *n;
        int32_t idx;
        
        if (!(dbus_message_get_args(m, &error, DBUS_TYPE_STRING, &n, DBUS_TYPE_INVALID)) || !n) {
            avahi_log_warn("Error parsing Server::GetNetworkInterfaceIndexByName message");
            goto fail;
        }

#ifdef VALGRIND_WORKAROUND
        return respond_int32(c, m, 1);
#else
        if (!(idx = if_nametoindex(n))) {
            char txt[256];
            snprintf(txt, sizeof(txt), "OS Error: %s", strerror(errno));
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_OS, txt);
        }
        
        return avahi_dbus_respond_int32(c, m, idx);
#endif

    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "GetAlternativeHostName")) {
        char *n, * t;
        
        if (!(dbus_message_get_args(m, &error, DBUS_TYPE_STRING, &n, DBUS_TYPE_INVALID)) || !n) {
            avahi_log_warn("Error parsing Server::GetAlternativeHostName message");
            goto fail;
        }

        t = avahi_alternative_host_name(n);
        avahi_dbus_respond_string(c, m, t);
        avahi_free(t);

        return DBUS_HANDLER_RESULT_HANDLED;

    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "GetAlternativeServiceName")) {
        char *n, *t;
        
        if (!(dbus_message_get_args(m, &error, DBUS_TYPE_STRING, &n, DBUS_TYPE_INVALID)) || !n) {
            avahi_log_warn("Error parsing Server::GetAlternativeServiceName message");
            goto fail;
        }

        t = avahi_alternative_service_name(n);
        avahi_dbus_respond_string(c, m, t);
        avahi_free(t);

        return DBUS_HANDLER_RESULT_HANDLED;
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "EntryGroupNew")) {
        Client *client;
        EntryGroupInfo *i;
        static const DBusObjectPathVTable vtable = {
            NULL,
            avahi_dbus_msg_entry_group_impl,
            NULL,
            NULL,
            NULL,
            NULL
        };

        if (!dbus_message_get_args(m, &error, DBUS_TYPE_INVALID)) {
            avahi_log_warn("Error parsing Server::EntryGroupNew message");
            goto fail;
        }

        if (disable_user_service_publishing)
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_NOT_PERMITTED, NULL);
        
        if (!(client = client_get(dbus_message_get_sender(m), TRUE))) {
            avahi_log_warn("Too many clients, client request failed.");
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_CLIENTS, NULL);
        }

        if (client->n_objects >= OBJECTS_PER_CLIENT_MAX) {
            avahi_log_warn("Too many objects for client '%s', client request failed.", client->name);
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_OBJECTS, NULL);
        }

        i = avahi_new(EntryGroupInfo, 1);
        i->id = ++client->current_id;
        i->client = client;
        i->path = NULL;
        i->n_entries = 0;
        AVAHI_LLIST_PREPEND(EntryGroupInfo, entry_groups, client->entry_groups, i);
        client->n_objects++;
        
        if (!(i->entry_group = avahi_s_entry_group_new(avahi_server, avahi_dbus_entry_group_callback, i))) {
            avahi_dbus_entry_group_free(i);
            return avahi_dbus_respond_error(c, m, avahi_server_errno(avahi_server), NULL);
        }

        i->path = avahi_strdup_printf("/Client%u/EntryGroup%u", client->id, i->id);
        dbus_connection_register_object_path(c, i->path, &vtable, i);
        return avahi_dbus_respond_path(c, m, i->path);
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "ResolveHostName")) {
        Client *client;
        int32_t interface, protocol, aprotocol;
        uint32_t flags;
        char *name;
        SyncHostNameResolverInfo *i;
            
        if (!dbus_message_get_args(
                m, &error,
                DBUS_TYPE_INT32, &interface,
                DBUS_TYPE_INT32, &protocol,
                DBUS_TYPE_STRING, &name,
                DBUS_TYPE_INT32, &aprotocol,
                DBUS_TYPE_UINT32, &flags,
                DBUS_TYPE_INVALID) || !name) {
            avahi_log_warn("Error parsing Server::ResolveHostName message");
            goto fail;
        }

        if (!(client = client_get(dbus_message_get_sender(m), TRUE))) {
            avahi_log_warn("Too many clients, client request failed.");
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_CLIENTS, NULL);
        }

        if (client->n_objects >= OBJECTS_PER_CLIENT_MAX) {
            avahi_log_warn("Too many objects for client '%s', client request failed.", client->name);
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_OBJECTS, NULL);
        }

        i = avahi_new(SyncHostNameResolverInfo, 1);
        i->client = client;
        i->message = dbus_message_ref(m);
        AVAHI_LLIST_PREPEND(SyncHostNameResolverInfo, sync_host_name_resolvers, client->sync_host_name_resolvers, i);
        client->n_objects++;

        if (!(i->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, (AvahiIfIndex) interface, (AvahiProtocol) protocol, name, (AvahiProtocol) aprotocol, (AvahiLookupFlags) flags, avahi_dbus_sync_host_name_resolver_callback, i))) {
            avahi_dbus_sync_host_name_resolver_free(i);
            return avahi_dbus_respond_error(c, m, avahi_server_errno(avahi_server), NULL);
        }
        
        return DBUS_HANDLER_RESULT_HANDLED;
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "ResolveAddress")) {
        Client *client;
        int32_t interface, protocol;
        uint32_t flags;
        char *address;
        SyncAddressResolverInfo *i;
        AvahiAddress a;
            
        if (!dbus_message_get_args(
                m, &error,
                DBUS_TYPE_INT32, &interface,
                DBUS_TYPE_INT32, &protocol,
                DBUS_TYPE_STRING, &address,
                DBUS_TYPE_UINT32, &flags, 
                DBUS_TYPE_INVALID) || !address) {
            avahi_log_warn("Error parsing Server::ResolveAddress message");
            goto fail;
        }

        if (!avahi_address_parse(address, AVAHI_PROTO_UNSPEC, &a))
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_INVALID_ADDRESS, NULL);

        if (!(client = client_get(dbus_message_get_sender(m), TRUE))) {
            avahi_log_warn("Too many clients, client request failed.");
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_CLIENTS, NULL);
        }

        if (client->n_objects >= OBJECTS_PER_CLIENT_MAX) {
            avahi_log_warn("Too many objects for client '%s', client request failed.", client->name);
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_OBJECTS, NULL);
        }

        i = avahi_new(SyncAddressResolverInfo, 1);
        i->client = client;
        i->message = dbus_message_ref(m);
        AVAHI_LLIST_PREPEND(SyncAddressResolverInfo, sync_address_resolvers, client->sync_address_resolvers, i);
        client->n_objects++;

        if (!(i->address_resolver = avahi_s_address_resolver_new(avahi_server, (AvahiIfIndex) interface, (AvahiProtocol) protocol, &a, (AvahiLookupFlags) flags, avahi_dbus_sync_address_resolver_callback, i))) {
            avahi_dbus_sync_address_resolver_free(i);
            return avahi_dbus_respond_error(c, m, avahi_server_errno(avahi_server), NULL);
        }
        
        return DBUS_HANDLER_RESULT_HANDLED;
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "DomainBrowserNew")) {
        Client *client;
        DomainBrowserInfo *i;
        static const DBusObjectPathVTable vtable = {
            NULL,
            avahi_dbus_msg_domain_browser_impl,
            NULL,
            NULL,
            NULL,
            NULL
        };
        int32_t interface, protocol, type;
        uint32_t flags;
        char *domain;
        
        if (!dbus_message_get_args(
                m, &error,
                DBUS_TYPE_INT32, &interface,
                DBUS_TYPE_INT32, &protocol,
                DBUS_TYPE_STRING, &domain,
                DBUS_TYPE_INT32, &type,
                DBUS_TYPE_UINT32, &flags,
                DBUS_TYPE_INVALID) || type < 0 || type >= AVAHI_DOMAIN_BROWSER_MAX) {
            avahi_log_warn("Error parsing Server::DomainBrowserNew message");
            goto fail;
        }

        if (!(client = client_get(dbus_message_get_sender(m), TRUE))) {
            avahi_log_warn("Too many clients, client request failed.");
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_CLIENTS, NULL);
        }

        if (client->n_objects >= OBJECTS_PER_CLIENT_MAX) {
            avahi_log_warn("Too many objects for client '%s', client request failed.", client->name);
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_OBJECTS, NULL);
        }

        if (!*domain)
            domain = NULL;

        i = avahi_new(DomainBrowserInfo, 1);
        i->id = ++client->current_id;
        i->client = client;
        i->path = NULL;
        AVAHI_LLIST_PREPEND(DomainBrowserInfo, domain_browsers, client->domain_browsers, i);
        client->n_objects++;

        if (!(i->domain_browser = avahi_s_domain_browser_new(avahi_server, (AvahiIfIndex) interface, (AvahiProtocol) protocol, domain, (AvahiDomainBrowserType) type, (AvahiLookupFlags) flags, avahi_dbus_domain_browser_callback, i))) {
            avahi_dbus_domain_browser_free(i);
            return avahi_dbus_respond_error(c, m, avahi_server_errno(avahi_server), NULL);
        }

        i->path = avahi_strdup_printf("/Client%u/DomainBrowser%u", client->id, i->id);
        dbus_connection_register_object_path(c, i->path, &vtable, i);
        return avahi_dbus_respond_path(c, m, i->path);

    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "ServiceTypeBrowserNew")) {
        Client *client;
        ServiceTypeBrowserInfo *i;
        static const DBusObjectPathVTable vtable = {
            NULL,
            avahi_dbus_msg_service_type_browser_impl,
            NULL,
            NULL,
            NULL,
            NULL
        };
        int32_t interface, protocol;
        uint32_t flags;
        char *domain;
        
        if (!dbus_message_get_args(
                m, &error,
                DBUS_TYPE_INT32, &interface,
                DBUS_TYPE_INT32, &protocol,
                DBUS_TYPE_STRING, &domain,
                DBUS_TYPE_UINT32, &flags,
                DBUS_TYPE_INVALID)) {
            avahi_log_warn("Error parsing Server::ServiceTypeBrowserNew message");
            goto fail;
        }

        if (!(client = client_get(dbus_message_get_sender(m), TRUE))) {
            avahi_log_warn("Too many clients, client request failed.");
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_CLIENTS, NULL);
        }

        if (client->n_objects >= OBJECTS_PER_CLIENT_MAX) {
            avahi_log_warn("Too many objects for client '%s', client request failed.", client->name);
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_OBJECTS, NULL);
        }

        if (!*domain)
            domain = NULL;

        i = avahi_new(ServiceTypeBrowserInfo, 1);
        i->id = ++client->current_id;
        i->client = client;
        i->path = NULL;
        AVAHI_LLIST_PREPEND(ServiceTypeBrowserInfo, service_type_browsers, client->service_type_browsers, i);
        client->n_objects++;

        if (!(i->service_type_browser = avahi_s_service_type_browser_new(avahi_server, (AvahiIfIndex) interface, (AvahiProtocol) protocol, domain, (AvahiLookupFlags) flags, avahi_dbus_service_type_browser_callback, i))) {
            avahi_dbus_service_type_browser_free(i);
            return avahi_dbus_respond_error(c, m, avahi_server_errno(avahi_server), NULL);
        }
        
        i->path = avahi_strdup_printf("/Client%u/ServiceTypeBrowser%u", client->id, i->id);
        dbus_connection_register_object_path(c, i->path, &vtable, i);
        return avahi_dbus_respond_path(c, m, i->path);
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "ServiceBrowserNew")) {
        Client *client;
        ServiceBrowserInfo *i;
        static const DBusObjectPathVTable vtable = {
            NULL,
            avahi_dbus_msg_service_browser_impl,
            NULL,
            NULL,
            NULL,
            NULL
        };
        int32_t interface, protocol;
        uint32_t flags;
        char *domain, *type;
        
        if (!dbus_message_get_args(
                m, &error,
                DBUS_TYPE_INT32, &interface,
                DBUS_TYPE_INT32, &protocol,
                DBUS_TYPE_STRING, &type,
                DBUS_TYPE_STRING, &domain,
                DBUS_TYPE_UINT32, &flags,
                DBUS_TYPE_INVALID) || !type) {
            avahi_log_warn("Error parsing Server::ServiceBrowserNew message");
            goto fail;
        }

        if (!(client = client_get(dbus_message_get_sender(m), TRUE))) {
            avahi_log_warn("Too many clients, client request failed.");
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_CLIENTS, NULL);
        }

        if (client->n_objects >= OBJECTS_PER_CLIENT_MAX) {
            avahi_log_warn("Too many objects for client '%s', client request failed.", client->name);
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_OBJECTS, NULL);
        }

        if (!*domain)
            domain = NULL;

        i = avahi_new(ServiceBrowserInfo, 1);
        i->id = ++client->current_id;
        i->client = client;
        i->path = NULL;
        AVAHI_LLIST_PREPEND(ServiceBrowserInfo, service_browsers, client->service_browsers, i);
        client->n_objects++;

        if (!(i->service_browser = avahi_s_service_browser_new(avahi_server, (AvahiIfIndex) interface, (AvahiProtocol) protocol, type, domain, (AvahiLookupFlags) flags, avahi_dbus_service_browser_callback, i))) {
            avahi_dbus_service_browser_free(i);
            return avahi_dbus_respond_error(c, m, avahi_server_errno(avahi_server), NULL);
        }

        i->path = avahi_strdup_printf("/Client%u/ServiceBrowser%u", client->id, i->id);
        dbus_connection_register_object_path(c, i->path, &vtable, i);
        return avahi_dbus_respond_path(c, m, i->path);
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "ResolveService")) {
        Client *client;
        int32_t interface, protocol, aprotocol;
        uint32_t flags;
        char *name, *type, *domain;
        SyncServiceResolverInfo *i;
            
        if (!dbus_message_get_args(
                m, &error,
                DBUS_TYPE_INT32, &interface,
                DBUS_TYPE_INT32, &protocol,
                DBUS_TYPE_STRING, &name,
                DBUS_TYPE_STRING, &type,
                DBUS_TYPE_STRING, &domain,
                DBUS_TYPE_INT32, &aprotocol,
                DBUS_TYPE_UINT32, &flags,
                DBUS_TYPE_INVALID) || !type) {
            avahi_log_warn("Error parsing Server::ResolveService message");
            goto fail;
        }

        if (!(client = client_get(dbus_message_get_sender(m), TRUE))) {
            avahi_log_warn("Too many clients, client request failed.");
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_CLIENTS, NULL);
        }
        
        if (client->n_objects >= OBJECTS_PER_CLIENT_MAX) {
            avahi_log_warn("Too many objects for client '%s', client request failed.", client->name);
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_OBJECTS, NULL);
        }

        if (!*domain)
            domain = NULL;

        if (!*name)
            name = NULL;
        
        i = avahi_new(SyncServiceResolverInfo, 1);
        i->client = client;
        i->message = dbus_message_ref(m);
        AVAHI_LLIST_PREPEND(SyncServiceResolverInfo, sync_service_resolvers, client->sync_service_resolvers, i);
        client->n_objects++;

        if (!(i->service_resolver = avahi_s_service_resolver_new(avahi_server, (AvahiIfIndex) interface, (AvahiProtocol) protocol, name, type, domain, (AvahiProtocol) aprotocol, (AvahiLookupFlags) flags, avahi_dbus_sync_service_resolver_callback, i))) {
            avahi_dbus_sync_service_resolver_free(i);
            return avahi_dbus_respond_error(c, m, avahi_server_errno(avahi_server), NULL);
        }
        
        return DBUS_HANDLER_RESULT_HANDLED;
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "ServiceResolverNew")) {
        Client *client;
        int32_t interface, protocol, aprotocol;
        uint32_t flags;
        char *name, *type, *domain;
        AsyncServiceResolverInfo *i;
        static const DBusObjectPathVTable vtable = {
            NULL,
            avahi_dbus_msg_async_service_resolver_impl,
            NULL,
            NULL,
            NULL,
            NULL
        };

        if (!dbus_message_get_args(
                m, &error,
                DBUS_TYPE_INT32, &interface,
                DBUS_TYPE_INT32, &protocol,
                DBUS_TYPE_STRING, &name,
                DBUS_TYPE_STRING, &type,
                DBUS_TYPE_STRING, &domain,
                DBUS_TYPE_INT32, &aprotocol,
                DBUS_TYPE_UINT32, &flags,
                DBUS_TYPE_INVALID) || !type) {
            avahi_log_warn("Error parsing Server::ServiceResolverNew message");
            goto fail;
        }
            
        if (!(client = client_get(dbus_message_get_sender(m), TRUE))) {
            avahi_log_warn(__FILE__": Too many clients, client request failed.");
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_CLIENTS, NULL);
        }

        if (client->n_objects >= OBJECTS_PER_CLIENT_MAX) {
            avahi_log_warn(__FILE__": Too many objects for client '%s', client request failed.", client->name);
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_OBJECTS, NULL);
        }

        if (!*domain)
            domain = NULL;

        if (!*name)
            name = NULL;
        
        i = avahi_new(AsyncServiceResolverInfo, 1);
        i->id = ++client->current_id;
        i->client = client;
        i->path = NULL;
        AVAHI_LLIST_PREPEND(AsyncServiceResolverInfo, async_service_resolvers, client->async_service_resolvers, i);
        client->n_objects++;

        if (!(i->service_resolver = avahi_s_service_resolver_new(avahi_server, (AvahiIfIndex) interface, (AvahiProtocol) protocol, name, type, domain, (AvahiProtocol) aprotocol, (AvahiLookupFlags) flags, avahi_dbus_async_service_resolver_callback, i))) {
            avahi_dbus_async_service_resolver_free(i);
            return avahi_dbus_respond_error(c, m, avahi_server_errno(avahi_server), NULL);
        }

/*         avahi_log_debug(__FILE__": [%s], new service resolver for <%s.%s.%s>", i->path, name, type, domain); */
        
        i->path = avahi_strdup_printf("/Client%u/ServiceResolver%u", client->id, i->id);
        dbus_connection_register_object_path(c, i->path, &vtable, i);
        return avahi_dbus_respond_path(c, m, i->path);

    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "HostNameResolverNew")) {
        Client *client;
        int32_t interface, protocol, aprotocol;
        uint32_t flags;
        char *name;
        AsyncHostNameResolverInfo *i;
        static const DBusObjectPathVTable vtable = {
            NULL,
            avahi_dbus_msg_async_host_name_resolver_impl,
            NULL,
            NULL,
            NULL,
            NULL
        };
            
        if (!dbus_message_get_args(
                m, &error,
                DBUS_TYPE_INT32, &interface,
                DBUS_TYPE_INT32, &protocol,
                DBUS_TYPE_STRING, &name,
                DBUS_TYPE_INT32, &aprotocol,
                DBUS_TYPE_UINT32, &flags,
                DBUS_TYPE_INVALID) || !name) {
            avahi_log_warn("Error parsing Server::HostNameResolverNew message");
            goto fail;
        }
            
        if (!(client = client_get(dbus_message_get_sender(m), TRUE))) {
            avahi_log_warn(__FILE__": Too many clients, client request failed.");
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_CLIENTS, NULL);
        }

        if (client->n_objects >= OBJECTS_PER_CLIENT_MAX) {
            avahi_log_warn(__FILE__": Too many objects for client '%s', client request failed.", client->name);
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_OBJECTS, NULL);
        }

        i = avahi_new(AsyncHostNameResolverInfo, 1);
        i->id = ++client->current_id;
        i->client = client;
        i->path = NULL;
        AVAHI_LLIST_PREPEND(AsyncHostNameResolverInfo, async_host_name_resolvers, client->async_host_name_resolvers, i);
        client->n_objects++;

        if (!(i->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, (AvahiIfIndex) interface, (AvahiProtocol) protocol, name, aprotocol, (AvahiLookupFlags) flags, avahi_dbus_async_host_name_resolver_callback, i))) {
            avahi_dbus_async_host_name_resolver_free(i);
            return avahi_dbus_respond_error(c, m, avahi_server_errno(avahi_server), NULL);
        }

        i->path = avahi_strdup_printf("/Client%u/HostNameResolver%u", client->id, i->id);
        dbus_connection_register_object_path(c, i->path, &vtable, i);
        return avahi_dbus_respond_path(c, m, i->path);

    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "AddressResolverNew")) {
        Client *client;
        int32_t interface, protocol;
        uint32_t flags;
        char *address;
        AsyncAddressResolverInfo *i;
        AvahiAddress a;
        static const DBusObjectPathVTable vtable = {
            NULL,
            avahi_dbus_msg_async_address_resolver_impl,
            NULL,
            NULL,
            NULL,
            NULL
        };
            
        if (!dbus_message_get_args(
                m, &error,
                DBUS_TYPE_INT32, &interface,
                DBUS_TYPE_INT32, &protocol,
                DBUS_TYPE_STRING, &address,
                DBUS_TYPE_UINT32, &flags,
                DBUS_TYPE_INVALID) || !address) {
            avahi_log_warn("Error parsing Server::AddressResolverNew message");
            goto fail;
        }

        if (!avahi_address_parse(address, AVAHI_PROTO_UNSPEC, &a))
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_INVALID_ADDRESS, NULL);

        if (!(client = client_get(dbus_message_get_sender(m), TRUE))) {
            avahi_log_warn(__FILE__": Too many clients, client request failed.");
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_CLIENTS, NULL);
        }

        if (client->n_objects >= OBJECTS_PER_CLIENT_MAX) {
            avahi_log_warn(__FILE__": Too many objects for client '%s', client request failed.", client->name);
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_OBJECTS, NULL);
        }

        i = avahi_new(AsyncAddressResolverInfo, 1);
        i->id = ++client->current_id;
        i->client = client;
        i->path = NULL;
        AVAHI_LLIST_PREPEND(AsyncAddressResolverInfo, async_address_resolvers, client->async_address_resolvers, i);
        client->n_objects++;

        if (!(i->address_resolver = avahi_s_address_resolver_new(avahi_server, (AvahiIfIndex) interface, (AvahiProtocol) protocol, &a, (AvahiLookupFlags) flags, avahi_dbus_async_address_resolver_callback, i))) {
            avahi_dbus_async_address_resolver_free(i);
            return avahi_dbus_respond_error(c, m, avahi_server_errno(avahi_server), NULL);
        }

        i->path = avahi_strdup_printf("/Client%u/AddressResolver%u", client->id, i->id);
        dbus_connection_register_object_path(c, i->path, &vtable, i);
        return avahi_dbus_respond_path(c, m, i->path);
        
    } else if (dbus_message_is_method_call(m, AVAHI_DBUS_INTERFACE_SERVER, "RecordBrowserNew")) {
        Client *client;
        RecordBrowserInfo *i;
        static const DBusObjectPathVTable vtable = {
            NULL,
            avahi_dbus_msg_record_browser_impl,
            NULL,
            NULL,
            NULL,
            NULL
        };
        int32_t interface, protocol;
        uint32_t flags;
        char *name;
        uint16_t type, clazz;
        AvahiKey *key;
        
        if (!dbus_message_get_args(
                m, &error,
                DBUS_TYPE_INT32, &interface,
                DBUS_TYPE_INT32, &protocol,
                DBUS_TYPE_STRING, &name,
                DBUS_TYPE_UINT16, &clazz,
                DBUS_TYPE_UINT16, &type,
                DBUS_TYPE_UINT32, &flags,
                DBUS_TYPE_INVALID) || !name) {
            avahi_log_warn("Error parsing Server::RecordBrowserNew message");
            goto fail;
        }

        if (!avahi_is_valid_domain_name(name)) 
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_INVALID_DOMAIN_NAME, NULL);

        if (!(client = client_get(dbus_message_get_sender(m), TRUE))) {
            avahi_log_warn("Too many clients, client request failed.");
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_CLIENTS, NULL);
        }

        if (client->n_objects >= OBJECTS_PER_CLIENT_MAX) {
            avahi_log_warn("Too many objects for client '%s', client request failed.", client->name);
            return avahi_dbus_respond_error(c, m, AVAHI_ERR_TOO_MANY_OBJECTS, NULL);
        }

        i = avahi_new(RecordBrowserInfo, 1);
        i->id = ++client->current_id;
        i->client = client;
        i->path = NULL;
        AVAHI_LLIST_PREPEND(RecordBrowserInfo, record_browsers, client->record_browsers, i);
        client->n_objects++;

        key = avahi_key_new(name, clazz, type);
        assert(key);

        if (!(i->record_browser = avahi_s_record_browser_new(avahi_server, (AvahiIfIndex) interface, (AvahiProtocol) protocol, key, (AvahiLookupFlags) flags, avahi_dbus_record_browser_callback, i))) {
            avahi_key_unref(key);
            avahi_dbus_record_browser_free(i);
            return avahi_dbus_respond_error(c, m, avahi_server_errno(avahi_server), NULL);
        }

        avahi_key_unref(key);
        
        i->path = avahi_strdup_printf("/Client%u/RecordBrowser%u", client->id, i->id);
        dbus_connection_register_object_path(c, i->path, &vtable, i);
        return avahi_dbus_respond_path(c, m, i->path);
    }

    avahi_log_warn("Missed message %s::%s()", dbus_message_get_interface(m), dbus_message_get_member(m));

fail:
    if (dbus_error_is_set(&error))
        dbus_error_free(&error);
    
    return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}

void dbus_protocol_server_state_changed(AvahiServerState state) {
    DBusMessage *m;
    int32_t t;
    const char *e;
    
    if (!server || !server->bus)
        return;

    m = dbus_message_new_signal(AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "StateChanged");
    t = (int32_t) state;

    if (state == AVAHI_SERVER_COLLISION)
        e = AVAHI_DBUS_ERR_COLLISION;
    else if (state == AVAHI_SERVER_FAILURE)
        e = avahi_error_number_to_dbus(avahi_server_errno(avahi_server));
    else
        e = AVAHI_DBUS_ERR_OK;
    
    dbus_message_append_args(m, DBUS_TYPE_INT32, &t, DBUS_TYPE_STRING, &e, DBUS_TYPE_INVALID);
    dbus_connection_send(server->bus, m, NULL);
    dbus_message_unref(m);
}

static int dbus_connect(void) {
    DBusError error;

    static const DBusObjectPathVTable server_vtable = {
        NULL,
        msg_server_impl,
        NULL,
        NULL,
        NULL,
        NULL
    };

    assert(server);
    assert(!server->bus);

    dbus_error_init(&error);

#ifdef HAVE_DBUS_BUS_GET_PRIVATE    
    if (!(server->bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) {
        assert(dbus_error_is_set(&error));
        avahi_log_error("dbus_bus_get_private(): %s", error.message);
        goto fail;
    }
#else
    {
        const char *a;

        if (!(a = getenv("DBUS_SYSTEM_BUS_ADDRESS")) || !*a)
            a = DBUS_SYSTEM_BUS_DEFAULT_ADDRESS;
        
        if (!(server->bus = dbus_connection_open_private(a, &error))) {
            assert(dbus_error_is_set(&error));
            avahi_log_error("dbus_bus_open_private(): %s", error.message);
            goto fail;
        }

        if (!dbus_bus_register(server->bus, &error)) {
            assert(dbus_error_is_set(&error));
            avahi_log_error("dbus_bus_register(): %s", error.message);
            goto fail;
        }
    }
#endif
    
    if (avahi_dbus_connection_glue(server->bus, server->poll_api) < 0) {
        avahi_log_error("avahi_dbus_connection_glue() failed");
        goto fail;
    }

    dbus_connection_set_exit_on_disconnect(server->bus, FALSE);
    
    if (dbus_bus_request_name(
            server->bus,
            AVAHI_DBUS_NAME,
#if (DBUS_VERSION_MAJOR == 0) && (DBUS_VERSION_MINOR < 60)
            DBUS_NAME_FLAG_PROHIBIT_REPLACEMENT,
#else
            DBUS_NAME_FLAG_DO_NOT_QUEUE,
#endif
            &error) != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
        if (dbus_error_is_set(&error)) {
            avahi_log_error("dbus_bus_request_name(): %s", error.message);
            goto fail;
        }

        avahi_log_error("Failed to acquire D-Bus name '"AVAHI_DBUS_NAME"'");
        goto fail;
    }

    if (!(dbus_connection_add_filter(server->bus, msg_signal_filter_impl, (void*) server->poll_api, NULL))) {
        avahi_log_error("dbus_connection_add_filter() failed");
        goto fail;
    }
    
    dbus_bus_add_match(server->bus, "type='signal',""interface='" DBUS_INTERFACE_DBUS  "'", &error);

    if (dbus_error_is_set(&error)) {
        avahi_log_error("dbus_bus_add_match(): %s", error.message);
        goto fail;
    }
    
    if (!(dbus_connection_register_object_path(server->bus, AVAHI_DBUS_PATH_SERVER, &server_vtable, NULL))) {
        avahi_log_error("dbus_connection_register_object_path() failed");
        goto fail;
    }

    return 0;
fail:

    if (dbus_error_is_set(&error))
        dbus_error_free(&error);

    if (server->bus) {
#ifdef HAVE_DBUS_CONNECTION_CLOSE
        dbus_connection_close(server->bus);
#else
        dbus_connection_disconnect(server->bus);
#endif
        dbus_connection_unref(server->bus);
        server->bus = NULL;
    }

    return -1;
}

static void dbus_disconnect(void) {
    assert(server);

    while (server->clients)
        client_free(server->clients);
    
    assert(server->n_clients == 0);

    if (server->bus) {
#ifdef HAVE_DBUS_CONNECTION_CLOSE
        dbus_connection_close(server->bus);
#else
        dbus_connection_disconnect(server->bus);
#endif
        dbus_connection_unref(server->bus);
        server->bus = NULL;
    }
}

int dbus_protocol_setup(const AvahiPoll *poll_api, int _disable_user_service_publishing, int force) {

    disable_user_service_publishing = _disable_user_service_publishing;

    server = avahi_new(Server, 1);
    AVAHI_LLIST_HEAD_INIT(Clients, server->clients);
    server->current_id = 0;
    server->n_clients = 0;
    server->bus = NULL;
    server->poll_api = poll_api;
    server->reconnect_timeout = NULL;
    server->reconnect = force;

    if (dbus_connect() < 0) {
        struct timeval tv;

        if (!force)
            goto fail;

        avahi_log_warn("WARNING: Failed to contact D-Bus daemon, retrying in %ims.", RECONNECT_MSEC);
        
        avahi_elapse_time(&tv, RECONNECT_MSEC, 0);
        server->reconnect_timeout = server->poll_api->timeout_new(server->poll_api, &tv, reconnect_callback, NULL);
    }
        
    return 0;

fail:
    if (server->bus) {
#ifdef HAVE_DBUS_CONNECTION_CLOSE
        dbus_connection_close(server->bus);
#else
        dbus_connection_disconnect(server->bus);
#endif

        dbus_connection_unref(server->bus);
    }

    avahi_free(server);
    server = NULL;
    return -1;
}

void dbus_protocol_shutdown(void) {

    if (server) {
        dbus_disconnect();

        if (server->reconnect_timeout)
            server->poll_api->timeout_free(server->reconnect_timeout);
        
        avahi_free(server);
        server = NULL;
    }
}

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