/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering Copyright 2013 Daniel Mack Copyright 2014 Kay Sievers systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see . ***/ #include #include #include #include "util.h" #include "sd-bus.h" #include "bus-internal.h" #include "bus-message.h" #include "bus-util.h" #include "strv.h" #include "set.h" #include "driver.h" #include "proxy.h" #include "synthesize.h" static int get_creds_by_name(sd_bus *bus, const char *name, uint64_t mask, sd_bus_creds **_creds, sd_bus_error *error) { _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL; int r; assert(bus); assert(name); assert(_creds); r = sd_bus_get_name_creds(bus, name, mask, &c); if (r == -ESRCH || r == -ENXIO) return sd_bus_error_setf(error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", name); if (r < 0) return r; *_creds = c; c = NULL; return 0; } static int get_creds_by_message(sd_bus *bus, sd_bus_message *m, uint64_t mask, sd_bus_creds **_creds, sd_bus_error *error) { const char *name; int r; assert(bus); assert(m); assert(_creds); r = sd_bus_message_read(m, "s", &name); if (r < 0) return r; return get_creds_by_name(bus, name, mask, _creds, error); } static int driver_activation(sd_bus_message *reply, void *userdata, sd_bus_error *error) { _cleanup_bus_message_unref_ sd_bus_message *m = NULL; ProxyActivation *activation = userdata; /* * The org.freedesktop.DBus.Peer.Ping() call returned. We don't care * whether this succeeded, failed, was not implemented or timed out. We * cannot assume that the target reacts to this properly. Hence, just * send the reply to the activation request and be done. */ m = activation->request; /* claim reference */ --activation->proxy->n_activations; LIST_REMOVE(activations_by_proxy, activation->proxy->activations, activation); sd_bus_slot_unref(activation->slot); free(activation); return synthetic_reply_method_return(m, "u", BUS_START_REPLY_SUCCESS); } int bus_proxy_process_driver(Proxy *p, sd_bus *a, sd_bus *b, sd_bus_message *m, SharedPolicy *sp, const struct ucred *ucred, Set *owned_names) { int r; assert(a); assert(b); assert(m); if (!a->is_kernel) return 0; if (!streq_ptr(sd_bus_message_get_destination(m), "org.freedesktop.DBus")) return 0; /* The "Hello()" call is is handled in process_hello() */ if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) { if (!sd_bus_message_has_signature(m, "")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); return synthetic_reply_method_return(m, "s", "\n" "\n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" " \n" "\n"); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "AddMatch")) { const char *match; if (!sd_bus_message_has_signature(m, "s")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = sd_bus_message_read(m, "s", &match); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_add_match(a, NULL, match, proxy_match, p); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); return synthetic_reply_method_return(m, NULL); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "RemoveMatch")) { const char *match; if (!sd_bus_message_has_signature(m, "s")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = sd_bus_message_read(m, "s", &match); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = bus_remove_match_by_string(a, match, NULL, NULL); if (r == 0) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_MATCH_RULE_NOT_FOUND, "Match rule not found")); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); return synthetic_reply_method_return(m, NULL); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionCredentials")) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; if (!sd_bus_message_has_signature(m, "s")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = get_creds_by_message(a, m, SD_BUS_CREDS_PID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SELINUX_CONTEXT, &creds, &error); if (r < 0) return synthetic_reply_method_errno(m, r, &error); r = sd_bus_message_new_method_return(m, &reply); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_message_open_container(reply, 'a', "{sv}"); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); /* Due to i.e. namespace translations some data might be missing */ if (creds->mask & SD_BUS_CREDS_PID) { r = sd_bus_message_append(reply, "{sv}", "ProcessID", "u", (uint32_t) creds->pid); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); } if (creds->mask & SD_BUS_CREDS_EUID) { r = sd_bus_message_append(reply, "{sv}", "UnixUserID", "u", (uint32_t) creds->euid); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); } if (creds->mask & SD_BUS_CREDS_SELINUX_CONTEXT) { r = sd_bus_message_open_container(reply, 'e', "sv"); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_message_append(reply, "s", "LinuxSecurityLabel"); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_message_open_container(reply, 'v', "ay"); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_message_append_array(reply, 'y', creds->label, strlen(creds->label)); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_message_close_container(reply); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_message_close_container(reply); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); } r = sd_bus_message_close_container(reply); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); return synthetic_driver_send(m->bus, reply); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionSELinuxSecurityContext")) { _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; if (!sd_bus_message_has_signature(m, "s")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = get_creds_by_message(a, m, SD_BUS_CREDS_SELINUX_CONTEXT, &creds, &error); if (r < 0) return synthetic_reply_method_errno(m, r, &error); if (!(creds->mask & SD_BUS_CREDS_SELINUX_CONTEXT)) return synthetic_reply_method_errno(m, -EOPNOTSUPP, NULL); r = sd_bus_message_new_method_return(m, &reply); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_message_append_array(reply, 'y', creds->label, strlen(creds->label)); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); return synthetic_driver_send(m->bus, reply); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionUnixProcessID")) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; if (!sd_bus_message_has_signature(m, "s")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = get_creds_by_message(a, m, SD_BUS_CREDS_PID, &creds, &error); if (r < 0) return synthetic_reply_method_errno(m, r, &error); if (!(creds->mask & SD_BUS_CREDS_PID)) return synthetic_reply_method_errno(m, -EOPNOTSUPP, NULL); return synthetic_reply_method_return(m, "u", (uint32_t) creds->pid); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionUnixUser")) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; if (!sd_bus_message_has_signature(m, "s")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = get_creds_by_message(a, m, SD_BUS_CREDS_EUID, &creds, &error); if (r < 0) return synthetic_reply_method_errno(m, r, &error); if (!(creds->mask & SD_BUS_CREDS_EUID)) return synthetic_reply_method_errno(m, -EOPNOTSUPP, NULL); return synthetic_reply_method_return(m, "u", (uint32_t) creds->euid); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetId")) { sd_id128_t server_id; char buf[SD_ID128_STRING_MAX]; if (!sd_bus_message_has_signature(m, "")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = sd_bus_get_bus_id(a, &server_id); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); return synthetic_reply_method_return(m, "s", sd_id128_to_string(server_id, buf)); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetNameOwner")) { const char *name; _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; if (!sd_bus_message_has_signature(m, "s")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = sd_bus_message_read(m, "s", &name); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); if (streq(name, "org.freedesktop.DBus")) return synthetic_reply_method_return(m, "s", "org.freedesktop.DBus"); r = get_creds_by_name(a, name, SD_BUS_CREDS_UNIQUE_NAME, &creds, &error); if (r < 0) return synthetic_reply_method_errno(m, r, &error); if (!(creds->mask & SD_BUS_CREDS_UNIQUE_NAME)) return synthetic_reply_method_errno(m, -EOPNOTSUPP, NULL); return synthetic_reply_method_return(m, "s", creds->unique_name); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListActivatableNames")) { _cleanup_strv_free_ char **names = NULL; if (!sd_bus_message_has_signature(m, "")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = sd_bus_list_names(a, NULL, &names); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); /* Let's sort the names list to make it stable */ strv_sort(names); return synthetic_reply_method_return_strv(m, names); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListNames")) { _cleanup_strv_free_ char **names = NULL; if (!sd_bus_message_has_signature(m, "")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = sd_bus_list_names(a, &names, NULL); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = strv_extend(&names, "org.freedesktop.DBus"); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); /* Let's sort the names list to make it stable */ strv_sort(names); return synthetic_reply_method_return_strv(m, names); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListQueuedOwners")) { struct kdbus_cmd_list cmd = { .flags = KDBUS_LIST_QUEUED, .size = sizeof(cmd), }; struct kdbus_info *name_list, *name; _cleanup_strv_free_ char **owners = NULL; _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; char *arg0; int err = 0; if (!sd_bus_message_has_signature(m, "s")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = sd_bus_message_read(m, "s", &arg0); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_get_name_creds(a, arg0, 0, NULL); if (r == -ESRCH || r == -ENXIO) { sd_bus_error_setf(&error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Could not get owners of name '%s': no such name.", arg0); return synthetic_reply_method_errno(m, r, &error); } if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = ioctl(a->input_fd, KDBUS_CMD_LIST, &cmd); if (r < 0) return synthetic_reply_method_errno(m, -errno, NULL); name_list = (struct kdbus_info *) ((uint8_t *) a->kdbus_buffer + cmd.offset); KDBUS_FOREACH(name, name_list, cmd.list_size) { struct kdbus_item *item; char *n; KDBUS_ITEM_FOREACH(item, name, items) { if (item->type == KDBUS_ITEM_OWNED_NAME) { if (!streq_ptr(item->name.name, arg0)) continue; if (asprintf(&n, ":1.%llu", (unsigned long long) name->id) < 0) { err = -ENOMEM; break; } r = strv_consume(&owners, n); if (r < 0) { err = r; break; } } } if (err < 0) break; } r = bus_kernel_cmd_free(a, cmd.offset); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); if (err < 0) return synthetic_reply_method_errno(m, err, NULL); return synthetic_reply_method_return_strv(m, owners); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "NameHasOwner")) { const char *name; if (!sd_bus_message_has_signature(m, "s")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = sd_bus_message_read(m, "s", &name); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); if (streq(name, "org.freedesktop.DBus")) return synthetic_reply_method_return(m, "b", true); r = sd_bus_get_name_creds(a, name, 0, NULL); if (r < 0 && r != -ESRCH && r != -ENXIO) return synthetic_reply_method_errno(m, r, NULL); return synthetic_reply_method_return(m, "b", r >= 0); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ReleaseName")) { const char *name; if (!sd_bus_message_has_signature(m, "s")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = sd_bus_message_read(m, "s", &name); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_release_name(a, name); if (r < 0) { if (r == -ESRCH) return synthetic_reply_method_return(m, "u", BUS_NAME_NON_EXISTENT); if (r == -EADDRINUSE) return synthetic_reply_method_return(m, "u", BUS_NAME_NOT_OWNER); return synthetic_reply_method_errno(m, r, NULL); } set_remove(owned_names, (char*) name); return synthetic_reply_method_return(m, "u", BUS_NAME_RELEASED); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ReloadConfig")) { if (!sd_bus_message_has_signature(m, "")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = shared_policy_reload(sp); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); return synthetic_reply_method_return(m, NULL); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "RequestName")) { const char *name; uint32_t flags, param; bool in_queue; if (!sd_bus_message_has_signature(m, "su")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = sd_bus_message_read(m, "su", &name, &flags); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); if (sp) { Policy *policy; bool denied; policy = shared_policy_acquire(sp); denied = !policy_check_own(policy, ucred->uid, ucred->gid, name); shared_policy_release(sp, policy); if (denied) return synthetic_reply_method_errno(m, -EPERM, NULL); } if ((flags & ~(BUS_NAME_ALLOW_REPLACEMENT|BUS_NAME_REPLACE_EXISTING|BUS_NAME_DO_NOT_QUEUE)) != 0) return synthetic_reply_method_errno(m, -EINVAL, NULL); param = 0; if (flags & BUS_NAME_ALLOW_REPLACEMENT) param |= SD_BUS_NAME_ALLOW_REPLACEMENT; if (flags & BUS_NAME_REPLACE_EXISTING) param |= SD_BUS_NAME_REPLACE_EXISTING; if (!(flags & BUS_NAME_DO_NOT_QUEUE)) param |= SD_BUS_NAME_QUEUE; r = set_put_strdup(owned_names, name); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_request_name(a, name, param); if (r < 0) { if (r == -EALREADY) return synthetic_reply_method_return(m, "u", BUS_NAME_ALREADY_OWNER); set_remove(owned_names, (char*) name); if (r == -EEXIST) return synthetic_reply_method_return(m, "u", BUS_NAME_EXISTS); return synthetic_reply_method_errno(m, r, NULL); } in_queue = (r == 0); if (in_queue) return synthetic_reply_method_return(m, "u", BUS_NAME_IN_QUEUE); return synthetic_reply_method_return(m, "u", BUS_NAME_PRIMARY_OWNER); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "StartServiceByName")) { _cleanup_bus_message_unref_ sd_bus_message *msg = NULL; ProxyActivation *activation; const char *name; uint64_t cookie; uint32_t flags; if (!sd_bus_message_has_signature(m, "su")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = sd_bus_message_read(m, "su", &name, &flags); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); if (flags != 0) return synthetic_reply_method_errno(m, -EINVAL, NULL); r = sd_bus_get_name_creds(a, name, 0, NULL); if (r >= 0 || streq(name, "org.freedesktop.DBus")) return synthetic_reply_method_return(m, "u", BUS_START_REPLY_ALREADY_RUNNING); if (r != -ESRCH) return synthetic_reply_method_errno(m, r, NULL); if (p->n_activations >= PROXY_ACTIVATIONS_MAX) return synthetic_reply_method_errno(m, -EMFILE, NULL); r = sd_bus_message_get_cookie(m, &cookie); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_message_new_method_call(a, &msg, name, "/", "org.freedesktop.DBus.Peer", "Ping"); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = bus_message_seal(msg, cookie, BUS_DEFAULT_TIMEOUT); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); activation = new0(ProxyActivation, 1); if (!activation) return synthetic_reply_method_errno(m, -ENOMEM, NULL); r = sd_bus_call_async(a, &activation->slot, msg, driver_activation, activation, 0); if (r < 0) { free(activation); return synthetic_reply_method_errno(m, r, NULL); } activation->proxy = p; activation->request = sd_bus_message_ref(m); LIST_PREPEND(activations_by_proxy, p->activations, activation); ++p->n_activations; return 1; } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "UpdateActivationEnvironment")) { _cleanup_bus_message_unref_ sd_bus_message *msg = NULL; _cleanup_strv_free_ char **args = NULL; if (!sd_bus_message_has_signature(m, "a{ss}")) return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters")); r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{ss}"); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "ss")) > 0) { _cleanup_free_ char *s = NULL; const char *key; const char *value; r = sd_bus_message_read(m, "ss", &key, &value); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); s = strjoin(key, "=", value, NULL); if (!s) return synthetic_reply_method_errno(m, -ENOMEM, NULL); r = strv_extend(&args, s); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_message_exit_container(m); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); } r = sd_bus_message_exit_container(m); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); if (!args) return synthetic_reply_method_errno(m, -EINVAL, NULL); r = sd_bus_message_new_method_call( a, &msg, "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "SetEnvironment"); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_message_append_strv(msg, args); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); r = sd_bus_call(a, msg, 0, NULL, NULL); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); return synthetic_reply_method_return(m, NULL); } else { _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; r = sd_bus_error_setf(&error, SD_BUS_ERROR_UNKNOWN_METHOD, "Unknown method '%s'.", m->member); return synthetic_reply_method_errno(m, r, &error); } }