/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ /* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * */ #include #include "activation.h" #include "activation-exit-codes.h" #include "desktop-file.h" #include "dispatch.h" #include "services.h" #include "test.h" #include "utils.h" #include #include #include #include #include #include #include #include #ifdef HAVE_ERRNO_H #include #endif 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; DBusHashTable *environment; }; typedef struct { int refcount; char *dir_c; DBusHashTable *entries; } BusServiceDirectory; typedef struct { int refcount; char *name; char *exec; char *user; char *systemd_service; unsigned long mtime; BusServiceDirectory *s_dir; char *filename; } BusActivationEntry; typedef struct BusPendingActivationEntry BusPendingActivationEntry; struct BusPendingActivationEntry { /* Normally a method call, but if connection is NULL, this is a signal * instead. */ DBusMessage *activation_message; /* NULL if this activation entry is for the dbus-daemon itself, * waiting for systemd to start. In this case, auto_activation is always * TRUE. */ DBusConnection *connection; dbus_bool_t auto_activation; dbus_bool_t is_put_back; }; typedef struct { int refcount; BusActivation *activation; char *service_name; char *exec; char *systemd_service; 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 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); 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); dbus_free (pending_activation->systemd_service); 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->user); dbus_free (entry->filename); dbus_free (entry->systemd_service); 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, *user, *exec_tmp, *systemd_service; BusActivationEntry *entry; DBusStat stat_buf; DBusString file_path; DBusError tmp_error; dbus_bool_t retval; _DBUS_ASSERT_ERROR_IS_CLEAR (error); retval = FALSE; name = NULL; exec = NULL; user = NULL; exec_tmp = NULL; entry = NULL; systemd_service = NULL; dbus_error_init (&tmp_error); 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 out; } if (!_dbus_stat (&file_path, &stat_buf, NULL)) { dbus_set_error (error, DBUS_ERROR_FAILED, "Can't stat the service file\n"); goto out; } if (!bus_desktop_file_get_string (desktop_file, DBUS_SERVICE_SECTION, DBUS_SERVICE_NAME, &name, error)) goto out; if (!bus_desktop_file_get_string (desktop_file, DBUS_SERVICE_SECTION, DBUS_SERVICE_EXEC, &exec_tmp, error)) goto out; exec = _dbus_strdup (_dbus_replace_install_prefix (exec_tmp)); dbus_free (exec_tmp); exec_tmp = NULL; /* user is not _required_ unless we are using system activation */ if (!bus_desktop_file_get_string (desktop_file, DBUS_SERVICE_SECTION, DBUS_SERVICE_USER, &user, &tmp_error)) { _DBUS_ASSERT_ERROR_IS_SET (&tmp_error); /* if we got OOM, then exit */ if (dbus_error_has_name (&tmp_error, DBUS_ERROR_NO_MEMORY)) { dbus_move_error (&tmp_error, error); goto out; } else { /* if we have error because we didn't find anything then continue */ dbus_error_free (&tmp_error); dbus_free (user); user = NULL; } } _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error); /* systemd service is never required */ if (!bus_desktop_file_get_string (desktop_file, DBUS_SERVICE_SECTION, DBUS_SERVICE_SYSTEMD_SERVICE, &systemd_service, &tmp_error)) { _DBUS_ASSERT_ERROR_IS_SET (&tmp_error); /* if we got OOM, then exit */ if (dbus_error_has_name (&tmp_error, DBUS_ERROR_NO_MEMORY)) { dbus_move_error (&tmp_error, error); goto out; } else { /* if we have error because we didn't find anything then continue */ dbus_error_free (&tmp_error); dbus_free (systemd_service); systemd_service = NULL; } } _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error); 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 out; } entry = dbus_new0 (BusActivationEntry, 1); if (entry == NULL) { BUS_SET_OOM (error); goto out; } entry->name = name; entry->exec = exec; entry->user = user; entry->systemd_service = systemd_service; entry->refcount = 1; /* ownership has been transferred to entry, do not free separately */ name = NULL; exec = NULL; user = NULL; systemd_service = NULL; entry->s_dir = s_dir; entry->filename = _dbus_strdup (_dbus_string_get_const_data (filename)); if (!entry->filename) { BUS_SET_OOM (error); goto out; } if (!_dbus_hash_table_insert_string (activation->entries, entry->name, bus_activation_entry_ref (entry))) { BUS_SET_OOM (error); goto out; } 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 out; } _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\" is already in cache, ignoring\n", name, _dbus_string_get_const_data (&file_path)); dbus_set_error (error, DBUS_ERROR_FAILED, "The new service name \"%s\" of service file \"%s\" is already in cache, ignoring\n", name, _dbus_string_get_const_data (&file_path)); goto out; } /* ownership has been transferred to entry, do not free separately */ dbus_free (entry->name); entry->name = name; name = NULL; dbus_free (entry->exec); entry->exec = exec; exec = NULL; dbus_free (entry->user); entry->user = user; user = NULL; dbus_free (entry->systemd_service); entry->systemd_service = systemd_service; systemd_service = NULL; 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); goto out; } } entry->mtime = stat_buf.mtime; retval = TRUE; out: /* if these have been transferred into entry, the variables will be NULL */ dbus_free (name); dbus_free (exec); dbus_free (user); dbus_free (systemd_service); _dbus_string_free (&file_path); if (entry) bus_activation_entry_unref (entry); return retval; } 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; } static dbus_bool_t populate_environment (BusActivation *activation) { DBusString key; DBusString value; int i; char **environment; dbus_bool_t retval = FALSE; environment = _dbus_get_environment (); if (environment == NULL) return FALSE; if (!_dbus_string_init (&key)) { dbus_free_string_array (environment); return FALSE; } if (!_dbus_string_init (&value)) { _dbus_string_free (&key); dbus_free_string_array (environment); return FALSE; } for (i = 0; environment[i] != NULL; i++) { if (!_dbus_string_append (&key, environment[i])) break; if (_dbus_string_split_on_byte (&key, '=', &value)) { char *hash_key, *hash_value; if (!_dbus_string_steal_data (&key, &hash_key)) break; if (!_dbus_string_steal_data (&value, &hash_value)) break; if (!_dbus_hash_table_insert_string (activation->environment, hash_key, hash_value)) break; } _dbus_string_set_length (&key, 0); _dbus_string_set_length (&value, 0); } if (environment[i] != NULL) goto out; retval = TRUE; out: _dbus_string_free (&key); _dbus_string_free (&value); dbus_free_string_array (environment); return retval; } dbus_bool_t bus_activation_reload (BusActivation *activation, const DBusString *address, DBusList **directories, DBusError *error) { DBusList *link; char *dir; if (activation->server_address != NULL) dbus_free (activation->server_address); if (!_dbus_string_copy_data (address, &activation->server_address)) { BUS_SET_OOM (error); goto failed; } if (activation->entries != NULL) _dbus_hash_table_unref (activation->entries); 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; } if (activation->directories != NULL) _dbus_hash_table_unref (activation->directories); 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; } 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 TRUE; failed: return FALSE; } BusActivation* bus_activation_new (BusContext *context, const DBusString *address, DBusList **directories, DBusError *error) { BusActivation *activation; _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 (!bus_activation_reload (activation, address, directories, error)) goto failed; /* Initialize this hash table once, we don't want to lose pending * activations on reload. */ 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->environment = _dbus_hash_table_new (DBUS_HASH_STRING, (DBusFreeFunction) dbus_free, (DBusFreeFunction) dbus_free); if (activation->environment == NULL) { BUS_SET_OOM (error); goto failed; } if (!populate_environment (activation)) { BUS_SET_OOM (error); goto failed; } 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); if (activation->environment) _dbus_hash_table_unref (activation->environment); dbus_free (activation); } static dbus_bool_t add_bus_environment (BusActivation *activation, DBusError *error) { const char *type; if (!bus_activation_set_environment_variable (activation, "DBUS_STARTER_ADDRESS", activation->server_address, error)) return FALSE; type = bus_context_get_type (activation->context); if (type != NULL) { if (!bus_activation_set_environment_variable (activation, "DBUS_STARTER_BUS_TYPE", type, error)) return FALSE; if (strcmp (type, "session") == 0) { if (!bus_activation_set_environment_variable (activation, "DBUS_SESSION_BUS_ADDRESS", activation->server_address, error)) return FALSE; } else if (strcmp (type, "system") == 0) { if (!bus_activation_set_environment_variable (activation, "DBUS_SYSTEM_BUS_ADDRESS", activation->server_address, error)) return FALSE; } } return TRUE; } 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_restore_pending_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_restore_pending_data)) { free_restore_pending_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; bus_context_log (activation->context, DBUS_SYSTEM_LOG_INFO, "Successfully activated service '%s'", service_name); 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); /* entry->connection is NULL for activating systemd */ if (entry->connection && 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) { BusPendingActivation *pending_activation; DBusList *link; /* 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 && !entry->is_put_back && (entry->connection == NULL || dbus_connection_get_is_connected (entry->connection))) { DBusConnection *addressed_recipient; DBusError error; dbus_error_init (&error); addressed_recipient = bus_service_get_primary_owners_connection (service); /* Resume dispatching where we left off in bus_dispatch() */ switch (bus_dispatch_matches (transaction, entry->connection, addressed_recipient, entry->activation_message, NULL, &error)) { case BUS_RESULT_TRUE: break; case BUS_RESULT_FALSE: /* If permission is denied, we just want to return the error * to the original method invoker; in particular, we don't * want to make the RequestName call fail with that error * (see fd.o #78979, CVE-2014-3477). */ if (!bus_transaction_send_error_reply (transaction, entry->connection, &error, entry->activation_message)) { bus_connection_send_oom_error (entry->connection, entry->activation_message); } link = next; continue; case BUS_RESULT_LATER: { DBusList *putback_message_link = link; DBusMessage *last_inserted_message = NULL; /* NULL entry->connection implies sending pending ActivationRequest message to systemd */ if (entry->connection == NULL) { _dbus_assert_not_reached ("bus_dispatch_matches returned BUS_RESULT_LATER unexpectedly when sender is NULL"); link = next; continue; } /** * Getting here means that policy check result is not yet available and dispatching * messages from entry->connection has been disabled. * Let's put back all messages for the given connection in the incoming queue and mark * this entry as put back so they are not handled twice. */ while (putback_message_link != NULL) { BusPendingActivationEntry *putback_message = putback_message_link->data; if (putback_message->connection == entry->connection) { if (!_dbus_connection_putback_message (putback_message->connection, last_inserted_message, putback_message->activation_message, &error)) goto error; last_inserted_message = putback_message->activation_message; putback_message->is_put_back = TRUE; } putback_message_link = _dbus_list_get_next_link(&pending_activation->entries, putback_message_link); } break; } } } 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"); goto error; } _dbus_hash_table_remove_string (activation->pending_activations, bus_service_get_name (service)); return TRUE; error: /* remove all messages that have been put to connections' incoming queues */ link = _dbus_list_get_first_link (&pending_activation->entries); while (link != NULL) { BusPendingActivationEntry *entry = link->data; if (entry->is_put_back) { _dbus_connection_remove_message(entry->connection, entry->activation_message); entry->is_put_back = FALSE; } link = _dbus_list_get_next_link(&pending_activation->entries, link); } 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 (entry->connection && 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); } /** * Depending on the exit code of the helper, set the error accordingly */ static void handle_servicehelper_exit_error (int exit_code, DBusError *error) { switch (exit_code) { case BUS_SPAWN_EXIT_CODE_CONFIG_INVALID: dbus_set_error (error, DBUS_ERROR_SPAWN_CONFIG_INVALID, "Invalid configuration (missing or empty ?)"); break; case BUS_SPAWN_EXIT_CODE_NO_MEMORY: dbus_set_error (error, DBUS_ERROR_NO_MEMORY, "Launcher could not run (out of memory)"); break; case BUS_SPAWN_EXIT_CODE_SETUP_FAILED: dbus_set_error (error, DBUS_ERROR_SPAWN_SETUP_FAILED, "Failed to setup environment correctly"); break; case BUS_SPAWN_EXIT_CODE_NAME_INVALID: dbus_set_error (error, DBUS_ERROR_SPAWN_SERVICE_INVALID, "Bus name is not valid or missing"); break; case BUS_SPAWN_EXIT_CODE_SERVICE_NOT_FOUND: dbus_set_error (error, DBUS_ERROR_SPAWN_SERVICE_NOT_FOUND, "Bus name not found in system service directory"); break; case BUS_SPAWN_EXIT_CODE_PERMISSIONS_INVALID: dbus_set_error (error, DBUS_ERROR_SPAWN_PERMISSIONS_INVALID, "The permission of the setuid helper is not correct"); break; case BUS_SPAWN_EXIT_CODE_FILE_INVALID: dbus_set_error (error, DBUS_ERROR_SPAWN_PERMISSIONS_INVALID, "The service file is incorrect or does not have all required attributes"); break; case BUS_SPAWN_EXIT_CODE_EXEC_FAILED: dbus_set_error (error, DBUS_ERROR_SPAWN_EXEC_FAILED, "Cannot launch daemon, file not found or permissions invalid"); break; case BUS_SPAWN_EXIT_CODE_INVALID_ARGS: dbus_set_error (error, DBUS_ERROR_INVALID_ARGS, "Invalid arguments to command line"); break; case BUS_SPAWN_EXIT_CODE_CHILD_SIGNALED: dbus_set_error (error, DBUS_ERROR_SPAWN_CHILD_SIGNALED, "Launched child was signaled, it probably crashed"); break; case BUS_SPAWN_EXIT_CODE_GENERIC_FAILURE: default: dbus_set_error (error, DBUS_ERROR_SPAWN_CHILD_EXITED, "Launch helper exited with unknown return code %i", exit_code); break; } } static void pending_activation_finished_cb (DBusBabysitter *babysitter, void *data) { BusPendingActivation *pending_activation = data; dbus_bool_t uses_servicehelper; _dbus_assert (babysitter == pending_activation->babysitter); _dbus_babysitter_ref (babysitter); /* There are two major cases here; are we the system bus or the session? Here this * is distinguished by whether or not we use a setuid helper launcher. With the launch helper, * some process exit codes are meaningful, processed by handle_servicehelper_exit_error. * * In both cases though, just ignore when a process exits with status 0; it's possible for * a program to (misguidedly) "daemonize", and that appears to us as an exit. This closes a race * condition between this code and the child process claiming the bus name. */ uses_servicehelper = bus_context_get_servicehelper (pending_activation->activation->context) != NULL; /* strictly speaking this is redundant with the check in dbus-spawn now */ if (_dbus_babysitter_get_child_exited (babysitter)) { DBusError error; DBusHashIter iter; dbus_bool_t activation_failed; int exit_code = 0; dbus_error_init (&error); _dbus_babysitter_set_child_exit_error (babysitter, &error); /* Explicitly check for SPAWN_CHILD_EXITED to avoid overwriting an * exec error */ if (dbus_error_has_name (&error, DBUS_ERROR_SPAWN_CHILD_EXITED) && _dbus_babysitter_get_child_exit_status (babysitter, &exit_code)) { activation_failed = exit_code != 0; dbus_error_free(&error); if (activation_failed) { if (uses_servicehelper) handle_servicehelper_exit_error (exit_code, &error); else _dbus_babysitter_set_child_exit_error (babysitter, &error); } } else { activation_failed = TRUE; } if (activation_failed) { bus_context_log (pending_activation->activation->context, DBUS_SYSTEM_LOG_INFO, "Activated service '%s' failed: %s", pending_activation->service_name, error.message); /* 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); } 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); } 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); } static void toggle_babysitter_watch (DBusWatch *watch, void *data) { BusPendingActivation *pending_activation = data; _dbus_loop_toggle_watch (bus_context_get_loop (pending_activation->activation->context), watch); } 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); bus_context_log_and_set_error (pending_activation->activation->context, DBUS_SYSTEM_LOG_INFO, &error, DBUS_ERROR_TIMED_OUT, "Failed to activate service '%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; } static char ** bus_activation_get_environment (BusActivation *activation) { char **environment; int i, length; DBusString entry; DBusHashIter iter; length = _dbus_hash_table_get_n_entries (activation->environment); environment = dbus_new0 (char *, length + 1); if (environment == NULL) return NULL; i = 0; _dbus_hash_iter_init (activation->environment, &iter); if (!_dbus_string_init (&entry)) { dbus_free_string_array (environment); return NULL; } while (_dbus_hash_iter_next (&iter)) { const char *key, *value; key = (const char *) _dbus_hash_iter_get_string_key (&iter); value = (const char *) _dbus_hash_iter_get_value (&iter); if (!_dbus_string_append_printf (&entry, "%s=%s", key, value)) break; if (!_dbus_string_steal_data (&entry, environment + i)) break; i++; } _dbus_string_free (&entry); if (i != length) { dbus_free_string_array (environment); environment = NULL; } return environment; } dbus_bool_t bus_activation_set_environment_variable (BusActivation *activation, const char *key, const char *value, DBusError *error) { char *hash_key; char *hash_value; dbus_bool_t retval; retval = FALSE; hash_key = NULL; hash_value = NULL; hash_key = _dbus_strdup (key); if (hash_key == NULL) goto out; hash_value = _dbus_strdup (value); if (hash_value == NULL) goto out; if (!_dbus_hash_table_insert_string (activation->environment, hash_key, hash_value)) goto out; retval = TRUE; out: if (retval == FALSE) { dbus_free (hash_key); dbus_free (hash_value); BUS_SET_OOM (error); } return retval; } static void child_setup (void *user_data) { #ifdef DBUS_UNIX BusActivation *activation = user_data; DBusRLimit *initial_fd_limit; DBusError error; dbus_error_init (&error); initial_fd_limit = bus_context_get_initial_fd_limit (activation->context); if (initial_fd_limit != NULL && !_dbus_rlimit_restore_fd_limit (initial_fd_limit, &error)) { /* unfortunately we don't actually know the service name here */ bus_context_log (activation->context, DBUS_SYSTEM_LOG_WARNING, "Failed to reset fd limit before activating " "service: %s: %s", error.name, error.message); } #endif } 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) { DBusError tmp_error; BusActivationEntry *entry; BusPendingActivation *pending_activation; BusPendingActivationEntry *pending_activation_entry; DBusMessage *message; DBusString service_str; const char *servicehelper; char **argv; char **envp = NULL; int argc; dbus_bool_t retval = FALSE; dbus_bool_t was_pending_activation; DBusString command; _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; if (connection) dbus_connection_ref (connection); /* Check if the service is being activated */ pending_activation = _dbus_hash_table_lookup_string (activation->pending_activations, service_name); was_pending_activation = (pending_activation != NULL); if (was_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; } if (entry->systemd_service) { pending_activation->systemd_service = _dbus_strdup (entry->systemd_service); if (!pending_activation->systemd_service) { _dbus_verbose ("Failed to copy systemd service 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)) { _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; 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); goto cancel_pending_activation; } if (was_pending_activation) return TRUE; if (bus_context_get_systemd_activation (activation->context)) { if (strcmp (service_name, "org.freedesktop.systemd1") == 0) /* systemd itself is missing apparently. That can happen only during early startup. Let's just wait until systemd connects to us and do nothing. */ return TRUE; if (entry->systemd_service) { BusTransaction *activation_transaction; DBusString service_string; BusService *service; BusRegistry *registry; /* OK, we have a systemd service configured for this entry, hence let's enqueue an activation request message. This is implemented as a directed signal, not a method call, for three reasons: 1) we don't expect a response on success, where we just expect a name appearing on the bus; 2) at this time the systemd service might not yet have connected, so we wouldn't know the message serial at this point to set up a pending call; 3) it is ugly if the bus suddenly becomes the caller of a remote method. */ message = dbus_message_new_signal (DBUS_PATH_DBUS, "org.freedesktop.systemd1.Activator", "ActivationRequest"); if (!message) { _dbus_verbose ("No memory to create activation message\n"); BUS_SET_OOM (error); goto cancel_pending_activation; } if (!dbus_message_set_sender (message, DBUS_SERVICE_DBUS) || !dbus_message_set_destination (message, "org.freedesktop.systemd1") || !dbus_message_append_args (message, DBUS_TYPE_STRING, &entry->systemd_service, DBUS_TYPE_INVALID)) { _dbus_verbose ("No memory to set args of activation message\n"); dbus_message_unref (message); BUS_SET_OOM (error); goto cancel_pending_activation; } /* Create our transaction */ activation_transaction = bus_transaction_new (activation->context); if (activation_transaction == NULL) { _dbus_verbose ("No memory to create activation transaction\n"); dbus_message_unref (message); BUS_SET_OOM (error); goto cancel_pending_activation; } /* Check whether systemd is already connected */ registry = bus_connection_get_registry (connection); _dbus_string_init_const (&service_string, "org.freedesktop.systemd1"); service = bus_registry_lookup (registry, &service_string); /* Following the general principle of "log early and often", * we capture that we *want* to send the activation message, even if * systemd is not actually there to receive it yet */ if (!bus_transaction_capture (activation_transaction, NULL, message)) { dbus_message_unref (message); BUS_SET_OOM (error); goto cancel_pending_activation; } if (service != NULL) { bus_context_log (activation->context, DBUS_SYSTEM_LOG_INFO, "Activating via systemd: service name='%s' unit='%s'", service_name, entry->systemd_service); /* Wonderful, systemd is connected, let's just send the msg */ switch (bus_dispatch_matches (activation_transaction, NULL, bus_service_get_primary_owners_connection (service), message, NULL, error)) { case BUS_RESULT_TRUE: retval = TRUE; break; case BUS_RESULT_FALSE: retval = FALSE; break; case BUS_RESULT_LATER: _dbus_verbose("Unexpectedly need time to check message from bus driver to systemd - dropping the message.\n"); retval = FALSE; break; } } else { bus_context_log (activation->context, DBUS_SYSTEM_LOG_INFO, "Activating systemd to hand-off: service name='%s' unit='%s'", service_name, entry->systemd_service); /* systemd is not around, let's "activate" it. */ retval = bus_activation_activate_service (activation, NULL, activation_transaction, TRUE, message, "org.freedesktop.systemd1", error); } dbus_message_unref (message); if (!retval) { bus_context_log (activation->context, DBUS_SYSTEM_LOG_INFO, "Failed to activate via systemd: service name='%s' unit='%s'", service_name, entry->systemd_service); _DBUS_ASSERT_ERROR_IS_SET (error); _dbus_verbose ("failed to send activation message: %s\n", error->name); bus_transaction_cancel_and_free (activation_transaction); goto cancel_pending_activation; } bus_transaction_execute_and_free (activation_transaction); return TRUE; } /* OK, we have no configured systemd service, hence let's proceed with traditional activation. */ } /* use command as system and session different */ if (!_dbus_string_init (&command)) { BUS_SET_OOM (error); goto cancel_pending_activation; } /* does the bus use a helper? */ servicehelper = bus_context_get_servicehelper (activation->context); if (servicehelper != NULL) { if (entry->user == NULL) { _dbus_string_free (&command); dbus_set_error (error, DBUS_ERROR_SPAWN_FILE_INVALID, "Cannot do system-bus activation with no user\n"); goto cancel_pending_activation; } /* join the helper path and the service name */ if (!_dbus_string_append (&command, servicehelper)) { _dbus_string_free (&command); BUS_SET_OOM (error); goto cancel_pending_activation; } if (!_dbus_string_append (&command, " ")) { _dbus_string_free (&command); BUS_SET_OOM (error); goto cancel_pending_activation; } if (!_dbus_string_append (&command, service_name)) { _dbus_string_free (&command); BUS_SET_OOM (error); goto cancel_pending_activation; } } else { /* the bus does not use a helper, so we can append arguments with the exec line */ if (!_dbus_string_append (&command, entry->exec)) { _dbus_string_free (&command); BUS_SET_OOM (error); goto cancel_pending_activation; } } /* convert command into arguments */ if (!_dbus_shell_parse_argv (_dbus_string_get_const_data (&command), &argc, &argv, error)) { _dbus_verbose ("Failed to parse command line: %s\n", entry->exec); _DBUS_ASSERT_ERROR_IS_SET (error); _dbus_string_free (&command); goto cancel_pending_activation; } _dbus_string_free (&command); if (!add_bus_environment (activation, error)) { _DBUS_ASSERT_ERROR_IS_SET (error); dbus_free_string_array (argv); goto cancel_pending_activation; } envp = bus_activation_get_environment (activation); if (envp == NULL) { BUS_SET_OOM (error); dbus_free_string_array (argv); goto cancel_pending_activation; } _dbus_verbose ("Spawning %s ...\n", argv[0]); if (servicehelper != NULL) bus_context_log (activation->context, DBUS_SYSTEM_LOG_INFO, "Activating service name='%s' (using servicehelper)", service_name); else bus_context_log (activation->context, DBUS_SYSTEM_LOG_INFO, "Activating service name='%s'", service_name); dbus_error_init (&tmp_error); if (!_dbus_spawn_async_with_babysitter (&pending_activation->babysitter, service_name, argv, envp, child_setup, activation, &tmp_error)) { _dbus_verbose ("Failed to spawn child\n"); bus_context_log (activation->context, DBUS_SYSTEM_LOG_INFO, "Failed to activate service %s: %s", service_name, tmp_error.message); _DBUS_ASSERT_ERROR_IS_SET (&tmp_error); dbus_move_error (&tmp_error, error); dbus_free_string_array (argv); dbus_free_string_array (envp); goto cancel_pending_activation; } dbus_free_string_array (argv); envp = NULL; _dbus_assert (pending_activation->babysitter != NULL); _dbus_babysitter_set_result_function (pending_activation->babysitter, pending_activation_finished_cb, pending_activation); if (!_dbus_babysitter_set_watch_functions (pending_activation->babysitter, add_babysitter_watch, remove_babysitter_watch, toggle_babysitter_watch, pending_activation, NULL)) { BUS_SET_OOM (error); _dbus_verbose ("Failed to set babysitter watch functions\n"); goto cancel_pending_activation; } return TRUE; cancel_pending_activation: _DBUS_ASSERT_ERROR_IS_SET (error); _dbus_hash_table_remove_string (activation->pending_activations, pending_activation->service_name); return FALSE; } 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[j]); dbus_free (retval); return FALSE; } dbus_bool_t dbus_activation_systemd_failure (BusActivation *activation, DBusMessage *message) { DBusError error; const char *code, *str, *unit = NULL; dbus_error_init(&error); /* This is called whenever the systemd activator sent us a response. We'll invalidate all pending activations that match the unit name. */ if (dbus_message_get_args (message, &error, DBUS_TYPE_STRING, &unit, DBUS_TYPE_STRING, &code, DBUS_TYPE_STRING, &str, DBUS_TYPE_INVALID)) dbus_set_error(&error, code, str); if (unit) { DBusHashIter iter; bus_context_log (activation->context, DBUS_SYSTEM_LOG_INFO, "Activation via systemd failed for unit '%s': %s", unit, str); _dbus_hash_iter_init (activation->pending_activations, &iter); while (_dbus_hash_iter_next (&iter)) { BusPendingActivation *p = _dbus_hash_iter_get_value (&iter); if (p->systemd_service && strcmp (p->systemd_service, unit) == 0) pending_activation_failed(p, &error); } } dbus_error_free(&error); return TRUE; } #ifdef DBUS_ENABLE_EMBEDDED_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; _dbus_directory_close (iter); 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; const char *tmp; dbus_bool_t ret = FALSE; if (!_dbus_string_init (&directory)) return FALSE; tmp = _dbus_get_tmpdir (); if (tmp == NULL) goto out; if (!_dbus_string_append (&directory, tmp)) goto out; if (!_dbus_string_append (&directory, "/dbus-reload-test-") || !_dbus_generate_random_ascii (&directory, 6, NULL)) goto out; /* 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)) goto out; ret = TRUE; out: _dbus_string_free (&directory); return ret; } #endif /* DBUS_ENABLE_EMBEDDED_TESTS */