diff -r 000000000000 -r e4d67989cc36 ofdbus/dbus/bus/activation.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ofdbus/dbus/bus/activation.c Tue Feb 02 02:01:42 2010 +0200 @@ -0,0 +1,1989 @@ +/* -*- mode: C; c-file-style: "gnu" -*- */ +/* activation.c Activation of services + * + * Copyright (C) 2003 CodeFactory AB + * Copyright (C) 2003 Red Hat, Inc. + * Copyright (C) 2004 Imendio HB + * Portion Copyright © 2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. + * + * Licensed under the Academic Free License version 2.1 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ +#include "activation.h" +#include "desktop-file.h" +#include "services.h" +#include "test.h" +#include "utils.h" + +#ifndef __SYMBIAN32__ +#include +#include +#include +#include +#include +#include +#include +#else +#include "dbus-internals.h" +#include "dbus-hash.h" +#include "dbus-list.h" +#include "dbus-shell.h" +#include "dbus-spawn.h" +#include "dbus-timeout.h" +#include "dbus-sysdeps.h" +#endif //__SYMBIAN32__ +#include +#include + +#define DBUS_SERVICE_SECTION "D-BUS Service" +#define DBUS_SERVICE_NAME "Name" +#define DBUS_SERVICE_EXEC "Exec" + +struct BusActivation +{ + int refcount; + DBusHashTable *entries; + DBusHashTable *pending_activations; + char *server_address; + BusContext *context; + int n_pending_activations; /**< This is in fact the number of BusPendingActivationEntry, + * i.e. number of pending activation requests, not pending + * activations per se + */ + DBusHashTable *directories; +}; + +typedef struct +{ + int refcount; + char *dir_c; + DBusHashTable *entries; +} BusServiceDirectory; + +typedef struct +{ + int refcount; + char *name; + char *exec; + unsigned long mtime; + BusServiceDirectory *s_dir; + char *filename; +} BusActivationEntry; + +typedef struct BusPendingActivationEntry BusPendingActivationEntry; + +struct BusPendingActivationEntry +{ + DBusMessage *activation_message; + DBusConnection *connection; + + dbus_bool_t auto_activation; +}; + +typedef struct +{ + int refcount; + BusActivation *activation; + char *service_name; + char *exec; + DBusList *entries; + int n_entries; + DBusBabysitter *babysitter; + DBusTimeout *timeout; + unsigned int timeout_added : 1; +} BusPendingActivation; + +#if 0 +static BusServiceDirectory * +bus_service_directory_ref (BusServiceDirectory *dir) +{ + _dbus_assert (dir->refcount); + + dir->refcount++; + + return dir; +} +#endif + +static void +bus_service_directory_unref (BusServiceDirectory *dir) +{ + if (dir == NULL) + return; + + _dbus_assert (dir->refcount > 0); + dir->refcount--; + + if (dir->refcount > 0) + return; + + if (dir->entries) + _dbus_hash_table_unref (dir->entries); + + dbus_free (dir->dir_c); + dbus_free (dir); +} + +static void +bus_pending_activation_entry_free (BusPendingActivationEntry *entry) +{ + if (entry->activation_message) + dbus_message_unref (entry->activation_message); + + if (entry->connection) + dbus_connection_unref (entry->connection); + + dbus_free (entry); +} + +static void +handle_timeout_callback (DBusTimeout *timeout, + void *data) +{ + BusPendingActivation *pending_activation = data; + + while (!dbus_timeout_handle (pending_activation->timeout)) + _dbus_wait_for_memory (); +} + +static BusPendingActivation * +bus_pending_activation_ref (BusPendingActivation *pending_activation) +{ + _dbus_assert (pending_activation->refcount > 0); + pending_activation->refcount += 1; + + return pending_activation; +} + +static void +bus_pending_activation_unref (BusPendingActivation *pending_activation) +{ + DBusList *link; + + if (pending_activation == NULL) /* hash table requires this */ + return; + + _dbus_assert (pending_activation->refcount > 0); + pending_activation->refcount -= 1; + + if (pending_activation->refcount > 0) + return; + + if (pending_activation->timeout_added) + { + _dbus_loop_remove_timeout (bus_context_get_loop (pending_activation->activation->context), + pending_activation->timeout, + handle_timeout_callback, pending_activation); + pending_activation->timeout_added = FALSE; + } + + if (pending_activation->timeout) + _dbus_timeout_unref (pending_activation->timeout); + + if (pending_activation->babysitter) + { + if (!_dbus_babysitter_set_watch_functions (pending_activation->babysitter, + NULL, NULL, NULL, + pending_activation->babysitter, + NULL)) + _dbus_assert_not_reached ("setting watch functions to NULL failed"); + + _dbus_babysitter_unref (pending_activation->babysitter); + } + + dbus_free (pending_activation->service_name); + dbus_free (pending_activation->exec); + + link = _dbus_list_get_first_link (&pending_activation->entries); + + while (link != NULL) + { + BusPendingActivationEntry *entry = link->data; + + bus_pending_activation_entry_free (entry); + + link = _dbus_list_get_next_link (&pending_activation->entries, link); + } + _dbus_list_clear (&pending_activation->entries); + + pending_activation->activation->n_pending_activations -= + pending_activation->n_entries; + + _dbus_assert (pending_activation->activation->n_pending_activations >= 0); + + dbus_free (pending_activation); +} + +static BusActivationEntry * +bus_activation_entry_ref (BusActivationEntry *entry) +{ + _dbus_assert (entry->refcount > 0); + entry->refcount++; + + return entry; +} + +static void +bus_activation_entry_unref (BusActivationEntry *entry) +{ + if (entry == NULL) /* hash table requires this */ + return; + + _dbus_assert (entry->refcount > 0); + entry->refcount--; + + if (entry->refcount > 0) + return; + + dbus_free (entry->name); + dbus_free (entry->exec); + dbus_free (entry->filename); + + dbus_free (entry); +} + +static dbus_bool_t +update_desktop_file_entry (BusActivation *activation, + BusServiceDirectory *s_dir, + DBusString *filename, + BusDesktopFile *desktop_file, + DBusError *error) +{ + char *name, *exec; + BusActivationEntry *entry; + DBusStat stat_buf; + DBusString file_path; + + _DBUS_ASSERT_ERROR_IS_CLEAR (error); + + name = NULL; + exec = NULL; + entry = NULL; + + if (!_dbus_string_init (&file_path)) + { + BUS_SET_OOM (error); + return FALSE; + } + + if (!_dbus_string_append (&file_path, s_dir->dir_c) || + !_dbus_concat_dir_and_file (&file_path, filename)) + { + BUS_SET_OOM (error); + goto failed; + } + + if (!_dbus_stat (&file_path, &stat_buf, NULL)) + { + dbus_set_error (error, DBUS_ERROR_FAILED, + "Can't stat the service file\n"); + goto failed; + } + + if (!bus_desktop_file_get_string (desktop_file, + DBUS_SERVICE_SECTION, + DBUS_SERVICE_NAME, + &name, + error)) + goto failed; + + if (!bus_desktop_file_get_string (desktop_file, + DBUS_SERVICE_SECTION, + DBUS_SERVICE_EXEC, + &exec, + error)) + goto failed; + + entry = _dbus_hash_table_lookup_string (s_dir->entries, + _dbus_string_get_const_data (filename)); + if (entry == NULL) /* New file */ + { + /* FIXME we need a better-defined algorithm for which service file to + * pick than "whichever one is first in the directory listing" + */ + if (_dbus_hash_table_lookup_string (activation->entries, name)) + { + dbus_set_error (error, DBUS_ERROR_FAILED, + "Service %s already exists in activation entry list\n", name); + goto failed; + } + + entry = dbus_new0 (BusActivationEntry, 1); + if (entry == NULL) + { + BUS_SET_OOM (error); + goto failed; + } + + entry->name = name; + entry->exec = exec; + entry->refcount = 1; + + entry->s_dir = s_dir; + entry->filename = _dbus_strdup (_dbus_string_get_const_data (filename)); + if (!entry->filename) + { + BUS_SET_OOM (error); + goto failed; + } + + if (!_dbus_hash_table_insert_string (activation->entries, entry->name, bus_activation_entry_ref (entry))) + { + BUS_SET_OOM (error); + goto failed; + } + + if (!_dbus_hash_table_insert_string (s_dir->entries, entry->filename, bus_activation_entry_ref (entry))) + { + /* Revert the insertion in the entries table */ + _dbus_hash_table_remove_string (activation->entries, entry->name); + BUS_SET_OOM (error); + goto failed; + } + + _dbus_verbose ("Added \"%s\" to list of services\n", entry->name); + } + else /* Just update the entry */ + { + bus_activation_entry_ref (entry); + _dbus_hash_table_remove_string (activation->entries, entry->name); + + if (_dbus_hash_table_lookup_string (activation->entries, name)) + { + _dbus_verbose ("The new service name \"%s\" of service file \"%s\" already in cache, ignoring\n", + name, _dbus_string_get_const_data (&file_path)); + goto failed; + } + + dbus_free (entry->name); + dbus_free (entry->exec); + entry->name = name; + entry->exec = exec; + if (!_dbus_hash_table_insert_string (activation->entries, + entry->name, bus_activation_entry_ref(entry))) + { + BUS_SET_OOM (error); + /* Also remove path to entries hash since we want this in sync with + * the entries hash table */ + _dbus_hash_table_remove_string (entry->s_dir->entries, + entry->filename); + bus_activation_entry_unref (entry); + return FALSE; + } + } + + entry->mtime = stat_buf.mtime; + + _dbus_string_free (&file_path); + bus_activation_entry_unref (entry); + + return TRUE; + +failed: + dbus_free (name); + dbus_free (exec); + _dbus_string_free (&file_path); + + if (entry) + bus_activation_entry_unref (entry); + + return FALSE; +} + +static dbus_bool_t +check_service_file (BusActivation *activation, + BusActivationEntry *entry, + BusActivationEntry **updated_entry, + DBusError *error) +{ + DBusStat stat_buf; + dbus_bool_t retval; + BusActivationEntry *tmp_entry; + DBusString file_path; + DBusString filename; + + retval = TRUE; + tmp_entry = entry; + + _dbus_string_init_const (&filename, entry->filename); + + if (!_dbus_string_init (&file_path)) + { + BUS_SET_OOM (error); + return FALSE; + } + + if (!_dbus_string_append (&file_path, entry->s_dir->dir_c) || + !_dbus_concat_dir_and_file (&file_path, &filename)) + { + BUS_SET_OOM (error); + retval = FALSE; + goto out; + } + + if (!_dbus_stat (&file_path, &stat_buf, NULL)) + { + _dbus_verbose ("****** Can't stat file \"%s\", removing from cache\n", + _dbus_string_get_const_data (&file_path)); + + _dbus_hash_table_remove_string (activation->entries, entry->name); + _dbus_hash_table_remove_string (entry->s_dir->entries, entry->filename); + + tmp_entry = NULL; + retval = TRUE; + goto out; + } + else + { + if (stat_buf.mtime > entry->mtime) + { + BusDesktopFile *desktop_file; + DBusError tmp_error; + + dbus_error_init (&tmp_error); + + desktop_file = bus_desktop_file_load (&file_path, &tmp_error); + if (desktop_file == NULL) + { + _dbus_verbose ("Could not load %s: %s\n", + _dbus_string_get_const_data (&file_path), + tmp_error.message); + if (dbus_error_has_name (&tmp_error, DBUS_ERROR_NO_MEMORY)) + { + dbus_move_error (&tmp_error, error); + retval = FALSE; + goto out; + } + dbus_error_free (&tmp_error); + retval = TRUE; + goto out; + } + + /* @todo We can return OOM or a DBUS_ERROR_FAILED error + * Handle these both better + */ + if (!update_desktop_file_entry (activation, entry->s_dir, &filename, desktop_file, &tmp_error)) + { + bus_desktop_file_free (desktop_file); + if (dbus_error_has_name (&tmp_error, DBUS_ERROR_NO_MEMORY)) + { + dbus_move_error (&tmp_error, error); + retval = FALSE; + goto out; + } + dbus_error_free (&tmp_error); + retval = TRUE; + goto out; + } + + bus_desktop_file_free (desktop_file); + retval = TRUE; + } + } + +out: + _dbus_string_free (&file_path); + + if (updated_entry != NULL) + *updated_entry = tmp_entry; + return retval; +} + + +/* warning: this doesn't fully "undo" itself on failure, i.e. doesn't strip + * hash entries it already added. + */ +static dbus_bool_t +update_directory (BusActivation *activation, + BusServiceDirectory *s_dir, + DBusError *error) +{ + DBusDirIter *iter; + DBusString dir, filename; + BusDesktopFile *desktop_file; + DBusError tmp_error; + dbus_bool_t retval; + BusActivationEntry *entry; + DBusString full_path; + + _DBUS_ASSERT_ERROR_IS_CLEAR (error); + + iter = NULL; + desktop_file = NULL; + + _dbus_string_init_const (&dir, s_dir->dir_c); + + if (!_dbus_string_init (&filename)) + { + BUS_SET_OOM (error); + return FALSE; + } + + if (!_dbus_string_init (&full_path)) + { + BUS_SET_OOM (error); + _dbus_string_free (&filename); + return FALSE; + } + + retval = FALSE; + + /* from this point it's safe to "goto out" */ + + iter = _dbus_directory_open (&dir, error); + if (iter == NULL) + { + _dbus_verbose ("Failed to open directory %s: %s\n", + s_dir->dir_c, + error ? error->message : "unknown"); + goto out; + } + + /* Now read the files */ + dbus_error_init (&tmp_error); + while (_dbus_directory_get_next_file (iter, &filename, &tmp_error)) + { + _dbus_assert (!dbus_error_is_set (&tmp_error)); + + _dbus_string_set_length (&full_path, 0); + + if (!_dbus_string_ends_with_c_str (&filename, ".service")) + { + _dbus_verbose ("Skipping non-.service file %s\n", + _dbus_string_get_const_data (&filename)); + continue; + } + + entry = _dbus_hash_table_lookup_string (s_dir->entries, _dbus_string_get_const_data (&filename)); + if (entry) /* Already has this service file in the cache */ + { + if (!check_service_file (activation, entry, NULL, error)) + goto out; + + continue; + } + + if (!_dbus_string_append (&full_path, s_dir->dir_c) || + !_dbus_concat_dir_and_file (&full_path, &filename)) + { + BUS_SET_OOM (error); + goto out; + } + + /* New file */ + desktop_file = bus_desktop_file_load (&full_path, &tmp_error); + if (desktop_file == NULL) + { + _dbus_verbose ("Could not load %s: %s\n", + _dbus_string_get_const_data (&full_path), + tmp_error.message); + + if (dbus_error_has_name (&tmp_error, DBUS_ERROR_NO_MEMORY)) + { + dbus_move_error (&tmp_error, error); + goto out; + } + + dbus_error_free (&tmp_error); + continue; + } + + /* @todo We can return OOM or a DBUS_ERROR_FAILED error + * Handle these both better + */ + if (!update_desktop_file_entry (activation, s_dir, &filename, desktop_file, &tmp_error)) + { + bus_desktop_file_free (desktop_file); + desktop_file = NULL; + + _dbus_verbose ("Could not add %s to activation entry list: %s\n", + _dbus_string_get_const_data (&full_path), tmp_error.message); + + if (dbus_error_has_name (&tmp_error, DBUS_ERROR_NO_MEMORY)) + { + dbus_move_error (&tmp_error, error); + goto out; + } + + dbus_error_free (&tmp_error); + continue; + } + else + { + bus_desktop_file_free (desktop_file); + desktop_file = NULL; + continue; + } + } + + if (dbus_error_is_set (&tmp_error)) + { + dbus_move_error (&tmp_error, error); + goto out; + } + + retval = TRUE; + + out: + if (!retval) + _DBUS_ASSERT_ERROR_IS_SET (error); + else + _DBUS_ASSERT_ERROR_IS_CLEAR (error); + + if (iter != NULL) + _dbus_directory_close (iter); + _dbus_string_free (&filename); + _dbus_string_free (&full_path); + + return retval; +} + +BusActivation* +bus_activation_new (BusContext *context, + const DBusString *address, + DBusList **directories, + DBusError *error) +{ + BusActivation *activation; + DBusList *link; + char *dir; + + _DBUS_ASSERT_ERROR_IS_CLEAR (error); + + activation = dbus_new0 (BusActivation, 1); + if (activation == NULL) + { + BUS_SET_OOM (error); + return NULL; + } + + activation->refcount = 1; + activation->context = context; + activation->n_pending_activations = 0; + + if (!_dbus_string_copy_data (address, &activation->server_address)) + { + BUS_SET_OOM (error); + goto failed; + } + + activation->entries = _dbus_hash_table_new (DBUS_HASH_STRING, NULL, + (DBusFreeFunction)bus_activation_entry_unref); + if (activation->entries == NULL) + { + BUS_SET_OOM (error); + goto failed; + } + + activation->pending_activations = _dbus_hash_table_new (DBUS_HASH_STRING, NULL, + (DBusFreeFunction)bus_pending_activation_unref); + + if (activation->pending_activations == NULL) + { + BUS_SET_OOM (error); + goto failed; + } + + activation->directories = _dbus_hash_table_new (DBUS_HASH_STRING, NULL, + (DBusFreeFunction)bus_service_directory_unref); + + if (activation->directories == NULL) + { + BUS_SET_OOM (error); + goto failed; + } + + /* Load service files */ + link = _dbus_list_get_first_link (directories); + while (link != NULL) + { + BusServiceDirectory *s_dir; + + dir = _dbus_strdup ((const char *) link->data); + if (!dir) + { + BUS_SET_OOM (error); + goto failed; + } + + s_dir = dbus_new0 (BusServiceDirectory, 1); + if (!s_dir) + { + dbus_free (dir); + BUS_SET_OOM (error); + goto failed; + } + + s_dir->refcount = 1; + s_dir->dir_c = dir; + + s_dir->entries = _dbus_hash_table_new (DBUS_HASH_STRING, NULL, + (DBusFreeFunction)bus_activation_entry_unref); + + if (!s_dir->entries) + { + bus_service_directory_unref (s_dir); + BUS_SET_OOM (error); + goto failed; + } + + if (!_dbus_hash_table_insert_string (activation->directories, s_dir->dir_c, s_dir)) + { + bus_service_directory_unref (s_dir); + BUS_SET_OOM (error); + goto failed; + } + + /* only fail on OOM, it is ok if we can't read the directory */ + if (!update_directory (activation, s_dir, error)) + { + if (dbus_error_has_name (error, DBUS_ERROR_NO_MEMORY)) + goto failed; + else + dbus_error_free (error); + } + + link = _dbus_list_get_next_link (directories, link); + } + + return activation; + + failed: + bus_activation_unref (activation); + return NULL; +} + +BusActivation * +bus_activation_ref (BusActivation *activation) +{ + _dbus_assert (activation->refcount > 0); + + activation->refcount += 1; + + return activation; +} + +void +bus_activation_unref (BusActivation *activation) +{ + _dbus_assert (activation->refcount > 0); + + activation->refcount -= 1; + + if (activation->refcount > 0) + return; + + dbus_free (activation->server_address); + if (activation->entries) + _dbus_hash_table_unref (activation->entries); + if (activation->pending_activations) + _dbus_hash_table_unref (activation->pending_activations); + if (activation->directories) + _dbus_hash_table_unref (activation->directories); + + dbus_free (activation); +} + +static void +child_setup (void *data) +{ + BusActivation *activation = data; + const char *type; + + /* If no memory, we simply have the child exit, so it won't try + * to connect to the wrong thing. + */ + if (!_dbus_setenv ("DBUS_STARTER_ADDRESS", activation->server_address)) + _dbus_exit (1); + + type = bus_context_get_type (activation->context); + if (type != NULL) + { + if (!_dbus_setenv ("DBUS_STARTER_BUS_TYPE", type)) + _dbus_exit (1); + + if (strcmp (type, "session") == 0) + { + if (!_dbus_setenv ("DBUS_SESSION_BUS_ADDRESS", + activation->server_address)) + _dbus_exit (1); + } + else if (strcmp (type, "system") == 0) + { + if (!_dbus_setenv ("DBUS_SYSTEM_BUS_ADDRESS", + activation->server_address)) + _dbus_exit (1); + } + } +} + +typedef struct +{ + BusPendingActivation *pending_activation; + DBusPreallocatedHash *hash_entry; +} RestorePendingData; + +static void +restore_pending (void *data) +{ + RestorePendingData *d = data; + + _dbus_assert (d->pending_activation != NULL); + _dbus_assert (d->hash_entry != NULL); + + _dbus_verbose ("Restoring pending activation for service %s, has timeout = %d\n", + d->pending_activation->service_name, + d->pending_activation->timeout_added); + + _dbus_hash_table_insert_string_preallocated (d->pending_activation->activation->pending_activations, + d->hash_entry, + d->pending_activation->service_name, d->pending_activation); + + bus_pending_activation_ref (d->pending_activation); + + d->hash_entry = NULL; +} + +static void +free_pending_restore_data (void *data) +{ + RestorePendingData *d = data; + + if (d->hash_entry) + _dbus_hash_table_free_preallocated_entry (d->pending_activation->activation->pending_activations, + d->hash_entry); + + bus_pending_activation_unref (d->pending_activation); + + dbus_free (d); +} + +static dbus_bool_t +add_restore_pending_to_transaction (BusTransaction *transaction, + BusPendingActivation *pending_activation) +{ + RestorePendingData *d; + + d = dbus_new (RestorePendingData, 1); + if (d == NULL) + return FALSE; + + d->pending_activation = pending_activation; + d->hash_entry = _dbus_hash_table_preallocate_entry (d->pending_activation->activation->pending_activations); + + bus_pending_activation_ref (d->pending_activation); + + if (d->hash_entry == NULL || + !bus_transaction_add_cancel_hook (transaction, restore_pending, d, + free_pending_restore_data)) + { + free_pending_restore_data (d); + return FALSE; + } + + _dbus_verbose ("Saved pending activation to be restored if the transaction fails\n"); + + return TRUE; +} + +dbus_bool_t +bus_activation_service_created (BusActivation *activation, + const char *service_name, + BusTransaction *transaction, + DBusError *error) +{ + BusPendingActivation *pending_activation; + DBusMessage *message; + DBusList *link; + + _DBUS_ASSERT_ERROR_IS_CLEAR (error); + + /* Check if it's a pending activation */ + pending_activation = _dbus_hash_table_lookup_string (activation->pending_activations, service_name); + + if (!pending_activation) + return TRUE; + + link = _dbus_list_get_first_link (&pending_activation->entries); + while (link != NULL) + { + BusPendingActivationEntry *entry = link->data; + DBusList *next = _dbus_list_get_next_link (&pending_activation->entries, link); + + if (dbus_connection_get_is_connected (entry->connection)) + { + /* Only send activation replies to regular activation requests. */ + if (!entry->auto_activation) + { + dbus_uint32_t result; + + message = dbus_message_new_method_return (entry->activation_message); + if (!message) + { + BUS_SET_OOM (error); + goto error; + } + + result = DBUS_START_REPLY_SUCCESS; + + if (!dbus_message_append_args (message, + DBUS_TYPE_UINT32, &result, + DBUS_TYPE_INVALID)) + { + dbus_message_unref (message); + BUS_SET_OOM (error); + goto error; + } + + if (!bus_transaction_send_from_driver (transaction, entry->connection, message)) + { + dbus_message_unref (message); + BUS_SET_OOM (error); + goto error; + } + + dbus_message_unref (message); + } + } + + link = next; + } + + return TRUE; + + error: + return FALSE; +} + +dbus_bool_t +bus_activation_send_pending_auto_activation_messages (BusActivation *activation, + BusService *service, + BusTransaction *transaction, + DBusError *error) +{ + BusPendingActivation *pending_activation; + DBusList *link; + + _DBUS_ASSERT_ERROR_IS_CLEAR (error); + + /* Check if it's a pending activation */ + pending_activation = _dbus_hash_table_lookup_string (activation->pending_activations, + bus_service_get_name (service)); + + if (!pending_activation) + return TRUE; + + link = _dbus_list_get_first_link (&pending_activation->entries); + while (link != NULL) + { + BusPendingActivationEntry *entry = link->data; + DBusList *next = _dbus_list_get_next_link (&pending_activation->entries, link); + + if (entry->auto_activation && dbus_connection_get_is_connected (entry->connection)) + { + DBusConnection *addressed_recipient; + + addressed_recipient = bus_service_get_primary_owners_connection (service); + + /* Check the security policy, which has the side-effect of adding an + * expected pending reply. + */ + if (!bus_context_check_security_policy (activation->context, transaction, + entry->connection, + addressed_recipient, + addressed_recipient, + entry->activation_message, error)) + goto error; + + if (!bus_transaction_send (transaction, addressed_recipient, entry->activation_message)) + { + BUS_SET_OOM (error); + goto error; + } + } + + link = next; + } + + if (!add_restore_pending_to_transaction (transaction, pending_activation)) + { + _dbus_verbose ("Could not add cancel hook to transaction to revert removing pending activation\n"); + BUS_SET_OOM (error); + goto error; + } + + _dbus_hash_table_remove_string (activation->pending_activations, bus_service_get_name (service)); + + return TRUE; + + error: + return FALSE; +} + +/** + * FIXME @todo the error messages here would ideally be preallocated + * so we don't need to allocate memory to send them. + * Using the usual tactic, prealloc an OOM message, then + * if we can't alloc the real error send the OOM error instead. + */ +static dbus_bool_t +try_send_activation_failure (BusPendingActivation *pending_activation, + const DBusError *how) +{ + BusActivation *activation; + DBusList *link; + BusTransaction *transaction; + + activation = pending_activation->activation; + + transaction = bus_transaction_new (activation->context); + if (transaction == NULL) + return FALSE; + + link = _dbus_list_get_first_link (&pending_activation->entries); + while (link != NULL) + { + BusPendingActivationEntry *entry = link->data; + DBusList *next = _dbus_list_get_next_link (&pending_activation->entries, link); + + if (dbus_connection_get_is_connected (entry->connection)) + { + if (!bus_transaction_send_error_reply (transaction, + entry->connection, + how, + entry->activation_message)) + goto error; + } + + link = next; + } + + bus_transaction_execute_and_free (transaction); + + return TRUE; + + error: + if (transaction) + bus_transaction_cancel_and_free (transaction); + return FALSE; +} + +/** + * Free the pending activation and send an error message to all the + * connections that were waiting for it. + */ +static void +pending_activation_failed (BusPendingActivation *pending_activation, + const DBusError *how) +{ + /* FIXME use preallocated OOM messages instead of bus_wait_for_memory() */ + while (!try_send_activation_failure (pending_activation, how)) + _dbus_wait_for_memory (); + + /* Destroy this pending activation */ + _dbus_hash_table_remove_string (pending_activation->activation->pending_activations, + pending_activation->service_name); +} + +static dbus_bool_t +babysitter_watch_callback (DBusWatch *watch, + unsigned int condition, + void *data) +{ + BusPendingActivation *pending_activation = data; + dbus_bool_t retval; + DBusBabysitter *babysitter; + + babysitter = pending_activation->babysitter; + + _dbus_babysitter_ref (babysitter); + + retval = dbus_watch_handle (watch, condition); + + /* FIXME this is broken in the same way that + * connection watches used to be; there should be + * a separate callback for status change, instead + * of doing "if we handled a watch status might + * have changed" + * + * Fixing this lets us move dbus_watch_handle + * calls into dbus-mainloop.c + */ + + if (_dbus_babysitter_get_child_exited (babysitter)) + { + DBusError error; + DBusHashIter iter; + + dbus_error_init (&error); + _dbus_babysitter_set_child_exit_error (babysitter, &error); + + /* Destroy all pending activations with the same exec */ + _dbus_hash_iter_init (pending_activation->activation->pending_activations, + &iter); + while (_dbus_hash_iter_next (&iter)) + { + BusPendingActivation *p = _dbus_hash_iter_get_value (&iter); + + if (p != pending_activation && strcmp (p->exec, pending_activation->exec) == 0) + pending_activation_failed (p, &error); + } + + /* Destroys the pending activation */ + pending_activation_failed (pending_activation, &error); + + dbus_error_free (&error); + } + + _dbus_babysitter_unref (babysitter); + + return retval; +} + +static dbus_bool_t +add_babysitter_watch (DBusWatch *watch, + void *data) +{ + BusPendingActivation *pending_activation = data; + + return _dbus_loop_add_watch (bus_context_get_loop (pending_activation->activation->context), + watch, babysitter_watch_callback, pending_activation, + NULL); +} + +static void +remove_babysitter_watch (DBusWatch *watch, + void *data) +{ + BusPendingActivation *pending_activation = data; + + _dbus_loop_remove_watch (bus_context_get_loop (pending_activation->activation->context), + watch, babysitter_watch_callback, pending_activation); +} + +static dbus_bool_t +pending_activation_timed_out (void *data) +{ + BusPendingActivation *pending_activation = data; + DBusError error; + + /* Kill the spawned process, since it sucks + * (not sure this is what we want to do, but + * may as well try it for now) + */ + if (pending_activation->babysitter) + _dbus_babysitter_kill_child (pending_activation->babysitter); + + dbus_error_init (&error); + + dbus_set_error (&error, DBUS_ERROR_TIMED_OUT, + "Activation of %s timed out", + pending_activation->service_name); + + pending_activation_failed (pending_activation, &error); + + dbus_error_free (&error); + + return TRUE; +} + +static void +cancel_pending (void *data) +{ + BusPendingActivation *pending_activation = data; + + _dbus_verbose ("Canceling pending activation of %s\n", + pending_activation->service_name); + + if (pending_activation->babysitter) + _dbus_babysitter_kill_child (pending_activation->babysitter); + + _dbus_hash_table_remove_string (pending_activation->activation->pending_activations, + pending_activation->service_name); +} + +static void +free_pending_cancel_data (void *data) +{ + BusPendingActivation *pending_activation = data; + + bus_pending_activation_unref (pending_activation); +} + +static dbus_bool_t +add_cancel_pending_to_transaction (BusTransaction *transaction, + BusPendingActivation *pending_activation) +{ + if (!bus_transaction_add_cancel_hook (transaction, cancel_pending, + pending_activation, + free_pending_cancel_data)) + return FALSE; + + bus_pending_activation_ref (pending_activation); + + _dbus_verbose ("Saved pending activation to be canceled if the transaction fails\n"); + + return TRUE; +} + +static dbus_bool_t +update_service_cache (BusActivation *activation, DBusError *error) +{ + DBusHashIter iter; + + _dbus_hash_iter_init (activation->directories, &iter); + while (_dbus_hash_iter_next (&iter)) + { + DBusError tmp_error; + BusServiceDirectory *s_dir; + + s_dir = _dbus_hash_iter_get_value (&iter); + + dbus_error_init (&tmp_error); + if (!update_directory (activation, s_dir, &tmp_error)) + { + if (dbus_error_has_name (&tmp_error, DBUS_ERROR_NO_MEMORY)) + { + dbus_move_error (&tmp_error, error); + return FALSE; + } + + dbus_error_free (&tmp_error); + continue; + } + } + + return TRUE; +} + +static BusActivationEntry * +activation_find_entry (BusActivation *activation, + const char *service_name, + DBusError *error) +{ + BusActivationEntry *entry; + + entry = _dbus_hash_table_lookup_string (activation->entries, service_name); + if (!entry) + { + if (!update_service_cache (activation, error)) + return NULL; + + entry = _dbus_hash_table_lookup_string (activation->entries, + service_name); + } + else + { + BusActivationEntry *updated_entry; + + if (!check_service_file (activation, entry, &updated_entry, error)) + return NULL; + + entry = updated_entry; + } + + if (!entry) + { + dbus_set_error (error, DBUS_ERROR_SERVICE_UNKNOWN, + "The name %s was not provided by any .service files", + service_name); + return NULL; + } + + return entry; +} + +dbus_bool_t +bus_activation_activate_service (BusActivation *activation, + DBusConnection *connection, + BusTransaction *transaction, + dbus_bool_t auto_activation, + DBusMessage *activation_message, + const char *service_name, + DBusError *error) +{ + BusActivationEntry *entry; + BusPendingActivation *pending_activation; + BusPendingActivationEntry *pending_activation_entry; + DBusMessage *message; + DBusString service_str; + char **argv; + int argc; + dbus_bool_t retval; + DBusHashIter iter; + dbus_bool_t activated; + + activated = TRUE; + + _DBUS_ASSERT_ERROR_IS_CLEAR (error); + + if (activation->n_pending_activations >= + bus_context_get_max_pending_activations (activation->context)) + { + dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED, + "The maximum number of pending activations has been reached, activation of %s failed", + service_name); + return FALSE; + } + + entry = activation_find_entry (activation, service_name, error); + if (!entry) + return FALSE; + + /* Bypass the registry lookup if we're auto-activating, bus_dispatch would not + * call us if the service is already active. + */ + if (!auto_activation) + { + /* Check if the service is active */ + _dbus_string_init_const (&service_str, service_name); + if (bus_registry_lookup (bus_context_get_registry (activation->context), &service_str) != NULL) + { + dbus_uint32_t result; + + _dbus_verbose ("Service \"%s\" is already active\n", service_name); + + message = dbus_message_new_method_return (activation_message); + + if (!message) + { + _dbus_verbose ("No memory to create reply to activate message\n"); + BUS_SET_OOM (error); + return FALSE; + } + + result = DBUS_START_REPLY_ALREADY_RUNNING; + + if (!dbus_message_append_args (message, + DBUS_TYPE_UINT32, &result, + DBUS_TYPE_INVALID)) + { + _dbus_verbose ("No memory to set args of reply to activate message\n"); + BUS_SET_OOM (error); + dbus_message_unref (message); + return FALSE; + } + + retval = bus_transaction_send_from_driver (transaction, connection, message); + dbus_message_unref (message); + if (!retval) + { + _dbus_verbose ("Failed to send reply\n"); + BUS_SET_OOM (error); + } + + return retval; + } + } + + pending_activation_entry = dbus_new0 (BusPendingActivationEntry, 1); + if (!pending_activation_entry) + { + _dbus_verbose ("Failed to create pending activation entry\n"); + BUS_SET_OOM (error); + return FALSE; + } + + pending_activation_entry->auto_activation = auto_activation; + + pending_activation_entry->activation_message = activation_message; + dbus_message_ref (activation_message); + pending_activation_entry->connection = connection; + dbus_connection_ref (connection); + + /* Check if the service is being activated */ + pending_activation = _dbus_hash_table_lookup_string (activation->pending_activations, service_name); + if (pending_activation) + { + if (!_dbus_list_append (&pending_activation->entries, pending_activation_entry)) + { + _dbus_verbose ("Failed to append a new entry to pending activation\n"); + + BUS_SET_OOM (error); + bus_pending_activation_entry_free (pending_activation_entry); + return FALSE; + } + + pending_activation->n_entries += 1; + pending_activation->activation->n_pending_activations += 1; + } + else + { + pending_activation = dbus_new0 (BusPendingActivation, 1); + if (!pending_activation) + { + _dbus_verbose ("Failed to create pending activation\n"); + + BUS_SET_OOM (error); + bus_pending_activation_entry_free (pending_activation_entry); + return FALSE; + } + + pending_activation->activation = activation; + pending_activation->refcount = 1; + + pending_activation->service_name = _dbus_strdup (service_name); + if (!pending_activation->service_name) + { + _dbus_verbose ("Failed to copy service name for pending activation\n"); + + BUS_SET_OOM (error); + bus_pending_activation_unref (pending_activation); + bus_pending_activation_entry_free (pending_activation_entry); + return FALSE; + } + + pending_activation->exec = _dbus_strdup (entry->exec); + if (!pending_activation->exec) + { + _dbus_verbose ("Failed to copy service exec for pending activation\n"); + BUS_SET_OOM (error); + bus_pending_activation_unref (pending_activation); + bus_pending_activation_entry_free (pending_activation_entry); + return FALSE; + } + + pending_activation->timeout = + _dbus_timeout_new (bus_context_get_activation_timeout (activation->context), + pending_activation_timed_out, + pending_activation, + NULL); + if (!pending_activation->timeout) + { + _dbus_verbose ("Failed to create timeout for pending activation\n"); + + BUS_SET_OOM (error); + bus_pending_activation_unref (pending_activation); + bus_pending_activation_entry_free (pending_activation_entry); + return FALSE; + } + + if (!_dbus_loop_add_timeout (bus_context_get_loop (activation->context), + pending_activation->timeout, + handle_timeout_callback, + pending_activation, + NULL)) + { + _dbus_verbose ("Failed to add timeout for pending activation\n"); + + BUS_SET_OOM (error); + bus_pending_activation_unref (pending_activation); + bus_pending_activation_entry_free (pending_activation_entry); + return FALSE; + } + + pending_activation->timeout_added = TRUE; + + if (!_dbus_list_append (&pending_activation->entries, pending_activation_entry)) + { + _dbus_verbose ("Failed to add entry to just-created pending activation\n"); + + BUS_SET_OOM (error); + bus_pending_activation_unref (pending_activation); + bus_pending_activation_entry_free (pending_activation_entry); + return FALSE; + } + + pending_activation->n_entries += 1; + pending_activation->activation->n_pending_activations += 1; + + activated = FALSE; + _dbus_hash_iter_init (activation->pending_activations, &iter); + while (_dbus_hash_iter_next (&iter)) + { + BusPendingActivation *p = _dbus_hash_iter_get_value (&iter); + + if (strcmp (p->exec, entry->exec) == 0) + { + activated = TRUE; + break; + } + } + + if (!_dbus_hash_table_insert_string (activation->pending_activations, + pending_activation->service_name, + pending_activation)) + { + _dbus_verbose ("Failed to put pending activation in hash table\n"); + + BUS_SET_OOM (error); + bus_pending_activation_unref (pending_activation); + return FALSE; + } + } + + if (!add_cancel_pending_to_transaction (transaction, pending_activation)) + { + _dbus_verbose ("Failed to add pending activation cancel hook to transaction\n"); + BUS_SET_OOM (error); + _dbus_hash_table_remove_string (activation->pending_activations, + pending_activation->service_name); + + return FALSE; + } + + if (activated) + return TRUE; + #ifndef __SYMBIAN32__ + + /* Now try to spawn the process */ + if (!_dbus_shell_parse_argv (entry->exec, &argc, &argv, error)) + { + _dbus_verbose ("Failed to parse command line: %s\n", entry->exec); + _DBUS_ASSERT_ERROR_IS_SET (error); + + _dbus_hash_table_remove_string (activation->pending_activations, + pending_activation->service_name); + + return FALSE; + } + + _dbus_verbose ("Spawning %s ...\n", argv[0]); + #else + + _dbus_verbose ("Spawning %s ...\n", entry->exec); + #endif + + #ifdef __SYMBIAN32__ + if (!_dbus_spawn_async_with_babysitter (&pending_activation->babysitter, &entry->exec, + child_setup, activation, + error)) + #else + if (!_dbus_spawn_async_with_babysitter (&pending_activation->babysitter, argv, + child_setup, activation, + error)) + { + _dbus_verbose ("Failed to spawn child\n"); + _DBUS_ASSERT_ERROR_IS_SET (error); + dbus_free_string_array (argv); + + return FALSE; + } + + dbus_free_string_array (argv); + + _dbus_assert (pending_activation->babysitter != NULL); + + if (!_dbus_babysitter_set_watch_functions (pending_activation->babysitter, + add_babysitter_watch, + remove_babysitter_watch, + NULL, + pending_activation, + NULL)) + { + BUS_SET_OOM (error); + _dbus_verbose ("Failed to set babysitter watch functions\n"); + return FALSE; + } + #endif + return TRUE; +} + +dbus_bool_t +bus_activation_list_services (BusActivation *activation, + char ***listp, + int *array_len) +{ + int i, j, len; + char **retval; + DBusHashIter iter; + + len = _dbus_hash_table_get_n_entries (activation->entries); + retval = dbus_new (char *, len + 1); + + if (retval == NULL) + return FALSE; + + _dbus_hash_iter_init (activation->entries, &iter); + i = 0; + while (_dbus_hash_iter_next (&iter)) + { + BusActivationEntry *entry = _dbus_hash_iter_get_value (&iter); + + retval[i] = _dbus_strdup (entry->name); + if (retval[i] == NULL) + goto error; + + i++; + } + + retval[i] = NULL; + + if (array_len) + *array_len = len; + + *listp = retval; + return TRUE; + + error: + for (j = 0; j < i; j++) + dbus_free (retval[i]); + dbus_free (retval); + + return FALSE; +} + + +#ifdef DBUS_BUILD_TESTS + +#include + +#define SERVICE_NAME_1 "MyService1" +#define SERVICE_NAME_2 "MyService2" +#define SERVICE_NAME_3 "MyService3" + +#define SERVICE_FILE_1 "service-1.service" +#define SERVICE_FILE_2 "service-2.service" +#define SERVICE_FILE_3 "service-3.service" + +static dbus_bool_t +test_create_service_file (DBusString *dir, + const char *filename, + const char *name, + const char *exec) +{ + DBusString file_name, full_path; + FILE *file; + dbus_bool_t ret_val; + + ret_val = TRUE; + _dbus_string_init_const (&file_name, filename); + + if (!_dbus_string_init (&full_path)) + return FALSE; + + if (!_dbus_string_append (&full_path, _dbus_string_get_const_data (dir)) || + !_dbus_concat_dir_and_file (&full_path, &file_name)) + { + ret_val = FALSE; + goto out; + } + + file = fopen (_dbus_string_get_const_data (&full_path), "w"); + if (!file) + { + ret_val = FALSE; + goto out; + } + + fprintf (file, "[D-BUS Service]\nName=%s\nExec=%s\n", name, exec); + fclose (file); + +out: + _dbus_string_free (&full_path); + return ret_val; +} + +static dbus_bool_t +test_remove_service_file (DBusString *dir, const char *filename) +{ + DBusString file_name, full_path; + dbus_bool_t ret_val; + + ret_val = TRUE; + + _dbus_string_init_const (&file_name, filename); + + if (!_dbus_string_init (&full_path)) + return FALSE; + + if (!_dbus_string_append (&full_path, _dbus_string_get_const_data (dir)) || + !_dbus_concat_dir_and_file (&full_path, &file_name)) + { + ret_val = FALSE; + goto out; + } + + if (!_dbus_delete_file (&full_path, NULL)) + { + ret_val = FALSE; + goto out; + } + +out: + _dbus_string_free (&full_path); + return ret_val; +} + +static dbus_bool_t +test_remove_directory (DBusString *dir) +{ + DBusDirIter *iter; + DBusString filename, full_path; + dbus_bool_t ret_val; + + ret_val = TRUE; + + if (!_dbus_string_init (&filename)) + return FALSE; + + if (!_dbus_string_init (&full_path)) + { + _dbus_string_free (&filename); + return FALSE; + } + + iter = _dbus_directory_open (dir, NULL); + if (iter == NULL) + { + ret_val = FALSE; + goto out; + } + + while (_dbus_directory_get_next_file (iter, &filename, NULL)) + { + if (!test_remove_service_file (dir, _dbus_string_get_const_data (&filename))) + { + ret_val = FALSE; + goto out; + } + } + _dbus_directory_close (iter); + + if (!_dbus_delete_directory (dir, NULL)) + { + ret_val = FALSE; + goto out; + } + +out: + _dbus_string_free (&filename); + _dbus_string_free (&full_path); + + return ret_val; +} + +static dbus_bool_t +init_service_reload_test (DBusString *dir) +{ + DBusStat stat_buf; + + if (!_dbus_stat (dir, &stat_buf, NULL)) + { + if (!_dbus_create_directory (dir, NULL)) + return FALSE; + } + else + { + if (!test_remove_directory (dir)) + return FALSE; + + if (!_dbus_create_directory (dir, NULL)) + return FALSE; + } + + /* Create one initial file */ + if (!test_create_service_file (dir, SERVICE_FILE_1, SERVICE_NAME_1, "exec-1")) + return FALSE; + + return TRUE; +} + +static dbus_bool_t +cleanup_service_reload_test (DBusString *dir) +{ + if (!test_remove_directory (dir)) + return FALSE; + + return TRUE; +} + +typedef struct +{ + BusActivation *activation; + const char *service_name; + dbus_bool_t expecting_find; +} CheckData; + +static dbus_bool_t +check_func (void *data) +{ + CheckData *d; + BusActivationEntry *entry; + DBusError error; + dbus_bool_t ret_val; + + ret_val = TRUE; + d = data; + + dbus_error_init (&error); + + entry = activation_find_entry (d->activation, d->service_name, &error); + if (entry == NULL) + { + if (dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY)) + { + ret_val = TRUE; + } + else + { + if (d->expecting_find) + ret_val = FALSE; + } + + dbus_error_free (&error); + } + else + { + if (!d->expecting_find) + ret_val = FALSE; + } + + return ret_val; +} + +static dbus_bool_t +do_test (const char *description, dbus_bool_t oom_test, CheckData *data) +{ + dbus_bool_t err; + + if (oom_test) + err = !_dbus_test_oom_handling (description, check_func, data); + else + err = !check_func (data); + + if (err) + _dbus_assert_not_reached ("Test failed"); + + return TRUE; +} + +static dbus_bool_t +do_service_reload_test (DBusString *dir, dbus_bool_t oom_test) +{ + BusActivation *activation; + DBusString address; + DBusList *directories; + CheckData d; + + directories = NULL; + _dbus_string_init_const (&address, ""); + + if (!_dbus_list_append (&directories, _dbus_string_get_data (dir))) + return FALSE; + + activation = bus_activation_new (NULL, &address, &directories, NULL); + if (!activation) + return FALSE; + + d.activation = activation; + + /* Check for existing service file */ + d.expecting_find = TRUE; + d.service_name = SERVICE_NAME_1; + + if (!do_test ("Existing service file", oom_test, &d)) + return FALSE; + + /* Check for non-existing service file */ + d.expecting_find = FALSE; + d.service_name = SERVICE_NAME_3; + + if (!do_test ("Nonexisting service file", oom_test, &d)) + return FALSE; + + /* Check for added service file */ + if (!test_create_service_file (dir, SERVICE_FILE_2, SERVICE_NAME_2, "exec-2")) + return FALSE; + + d.expecting_find = TRUE; + d.service_name = SERVICE_NAME_2; + + if (!do_test ("Added service file", oom_test, &d)) + return FALSE; + + /* Check for removed service file */ + if (!test_remove_service_file (dir, SERVICE_FILE_2)) + return FALSE; + + d.expecting_find = FALSE; + d.service_name = SERVICE_FILE_2; + + if (!do_test ("Removed service file", oom_test, &d)) + return FALSE; + + /* Check for updated service file */ + + _dbus_sleep_milliseconds (1000); /* Sleep a second to make sure the mtime is updated */ + + if (!test_create_service_file (dir, SERVICE_FILE_1, SERVICE_NAME_3, "exec-3")) + return FALSE; + + d.expecting_find = TRUE; + d.service_name = SERVICE_NAME_3; + + if (!do_test ("Updated service file, part 1", oom_test, &d)) + return FALSE; + + d.expecting_find = FALSE; + d.service_name = SERVICE_NAME_1; + + if (!do_test ("Updated service file, part 2", oom_test, &d)) + return FALSE; + + bus_activation_unref (activation); + _dbus_list_clear (&directories); + + return TRUE; +} + +dbus_bool_t +bus_activation_service_reload_test (const DBusString *test_data_dir) +{ + DBusString directory; + DBusStat stat_buf; + if (!_dbus_string_init (&directory)) + return FALSE; + + if (!_dbus_string_append (&directory, _dbus_get_tmpdir())) + return FALSE; + if (!_dbus_stat (&directory, &stat_buf, NULL)) + { + if (!_dbus_create_directory (&directory, NULL)) + return FALSE; + } + + if (!_dbus_string_append (&directory, "/dbus-reload-test-") || + !_dbus_generate_random_ascii (&directory, 6)) + { + return FALSE; + } + + /* Do normal tests */ + if (!init_service_reload_test (&directory)) + _dbus_assert_not_reached ("could not initiate service reload test"); + + if (!do_service_reload_test (&directory, FALSE)) + ; /* Do nothing? */ + + /* Do OOM tests */ + if (!init_service_reload_test (&directory)) + _dbus_assert_not_reached ("could not initiate service reload test"); + + if (!do_service_reload_test (&directory, TRUE)) + ; /* Do nothing? */ + + /* Cleanup test directory */ + if (!cleanup_service_reload_test (&directory)) + return FALSE; + + _dbus_string_free (&directory); + + return TRUE; +} + +#endif /* DBUS_BUILD_TESTS */