/* -*- 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 * * 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" #include #include #include #include #include #include #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)) { dbus_set_error (error, DBUS_ERROR_FAILED, "No \""DBUS_SERVICE_NAME"\" key in .service file\n"); goto failed; } if (!bus_desktop_file_get_string (desktop_file, DBUS_SERVICE_SECTION, DBUS_SERVICE_EXEC, &exec)) { dbus_set_error (error, DBUS_ERROR_FAILED, "No \""DBUS_SERVICE_EXEC"\" key in .service file\n"); 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; } 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; } 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); if (desktop_file) bus_desktop_file_free (desktop_file); _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; } if (!update_directory (activation, s_dir, error)) goto failed; 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; /* 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]); 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; } return TRUE; } #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; if (!_dbus_string_init (&directory)) return FALSE; if (!_dbus_string_append (&directory, "/tmp/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 */