/*** This file is part of systemd. Copyright 2013 Daniel Mack 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 <http://www.gnu.org/licenses/>. ***/ #include <stdlib.h> #include <stdbool.h> #include <unistd.h> #include <getopt.h> #include <locale.h> #include <string.h> #include <poll.h> #include <netdb.h> #include <sys/socket.h> #include <sys/un.h> #include <sys/timex.h> #include <sys/utsname.h> #include <unistd.h> #include "kdbus.h" #include "sd-bus.h" #include "bus-internal.h" #include "sd-daemon.h" #include "sd-event.h" #include "event-util.h" #include "bus-util.h" #include "bus-error.h" #include "bus-message.h" #include "bus-kernel.h" #include "socket-util.h" #include "util.h" #include "build.h" #include "strv.h" #include "sd-id128.h" #include "async.h" #include "hashmap.h" #include "def.h" #include "unit-name.h" /* * TODO: * * AddMatch / RemoveMatch */ static int driver_add_match(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { char *arg0; int r; r = sd_bus_message_read(m, "s", &arg0); if (r < 0) return r; /* FIXME */ return sd_bus_reply_method_return(m, NULL); } static int driver_remove_match(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { char *arg0; int r; r = sd_bus_message_read(m, "s", &arg0); if (r < 0) return r; /* FIXME */ return sd_bus_reply_method_return(m, NULL); } static int driver_get_security_ctx(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; char *arg0; int r; r = sd_bus_message_read(m, "s", &arg0); if (r < 0) return r; assert_return(service_name_is_valid(arg0), -EINVAL); r = sd_bus_get_owner(bus, arg0, SD_BUS_CREDS_SELINUX_CONTEXT, &creds); if (r < 0) return r; r = sd_bus_message_new_method_return(m, &reply); if (r < 0) return r; r = sd_bus_message_append_array(reply, 'y', creds->label, strlen(creds->label)); if (r < 0) return r; return sd_bus_send(bus, reply, NULL); } static int driver_get_pid(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; char *arg0; int r; r = sd_bus_message_read(m, "s", &arg0); if (r < 0) return r; assert_return(service_name_is_valid(arg0), -EINVAL); r = sd_bus_get_owner(bus, arg0, SD_BUS_CREDS_PID, &creds); if (r < 0) return r; return sd_bus_reply_method_return(m, "u", creds->pid); } static int driver_get_user(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; char *arg0; int r; r = sd_bus_message_read(m, "s", &arg0); if (r < 0) return r; assert_return(service_name_is_valid(arg0), -EINVAL); r = sd_bus_get_owner(bus, arg0, SD_BUS_CREDS_UID, &creds); if (r < 0) return r; return sd_bus_reply_method_return(m, "u", creds->uid); } static int driver_get_id(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { sd_id128_t server_id; char buf[SD_ID128_STRING_MAX]; int r; r = sd_bus_get_server_id(bus, &server_id); if (r < 0) return r; return sd_bus_reply_method_return(m, "s", sd_id128_to_string(server_id, buf)); } static int driver_get_name_owner(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; char *arg0; int r; r = sd_bus_message_read(m, "s", &arg0); if (r < 0) return r; assert_return(service_name_is_valid(arg0), -EINVAL); r = sd_bus_get_owner(bus, arg0, SD_BUS_CREDS_UNIQUE_NAME, &creds); if (r < 0) return r; return sd_bus_reply_method_return(m, "s", creds->unique_name); } static int driver_hello(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { return sd_bus_reply_method_return(m, "s", m->sender); } static int return_strv(sd_bus *bus, sd_bus_message *m, char **l) { _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; int r; r = sd_bus_message_new_method_return(m, &reply); if (r < 0) return r; r = sd_bus_message_append_strv(reply, l); if (r < 0) return r; return sd_bus_send(bus, reply, NULL); } static int driver_list_names(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { _cleanup_strv_free_ char **names = NULL; int r; r = sd_bus_list_names(bus, &names, NULL); if (r < 0) return r; return return_strv(bus, m, names); } static int driver_list_activatable_names(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { _cleanup_strv_free_ char **names = NULL; int r; r = sd_bus_list_names(bus, NULL, &names); if (r < 0) return r; return return_strv(bus, m, names); } static int driver_list_queued_owners(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { struct kdbus_cmd_name_list cmd = {}; struct kdbus_name_list *name_list; struct kdbus_cmd_name *name; _cleanup_strv_free_ char **owners = NULL; char *arg0; int r; r = sd_bus_message_read(m, "s", &arg0); if (r < 0) return r; assert_return(service_name_is_valid(arg0), -EINVAL); cmd.flags = KDBUS_NAME_LIST_QUEUED; r = ioctl(bus->input_fd, KDBUS_CMD_NAME_LIST, &cmd); if (r < 0) return -errno; name_list = (struct kdbus_name_list *) ((uint8_t *) bus->kdbus_buffer + cmd.offset); KDBUS_ITEM_FOREACH(name, name_list, names) { char *n; if (name->size <= sizeof(*name)) continue; if (!streq(name->name, arg0)) continue; if (asprintf(&n, ":1.%llu", (unsigned long long) name->id) < 0) return -ENOMEM; r = strv_push(&owners, n); if (r < 0) { free(n); return -ENOMEM; } } r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd.offset); if (r < 0) return -errno; return return_strv(bus, m, owners); } static int driver_name_has_owner(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { char *arg0; int r; r = sd_bus_message_read(m, "s", &arg0); if (r < 0) return r; assert_return(service_name_is_valid(arg0), -EINVAL); r = sd_bus_get_owner(bus, arg0, 0, NULL); if (r < 0 && r != -ENOENT) return r; return sd_bus_reply_method_return(m, "b", r >= 0); } static int driver_request_name(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { struct kdbus_cmd_name *n; uint32_t flags; size_t size, l; uint64_t id; const char *name; int r; r = sd_bus_message_read(m, "su", &name, &flags); if (r < 0) return r; assert_return(service_name_is_valid(name), -EINVAL); assert_return((flags & ~(BUS_NAME_ALLOW_REPLACEMENT|BUS_NAME_REPLACE_EXISTING|BUS_NAME_DO_NOT_QUEUE)) == 0, -EINVAL); l = strlen(name); size = offsetof(struct kdbus_cmd_name, name) + l + 1; n = alloca0(size); n->size = size; memcpy(n->name, name, l+1); kdbus_translate_request_name_flags(flags, (uint64_t *) &n->conn_flags); /* This function is open-coded because we request the name 'on behalf' * of the requesting connection */ r = bus_kernel_parse_unique_name(m->sender, &id); if (r < 0) return r; n->id = id; r = ioctl(bus->input_fd, KDBUS_CMD_NAME_ACQUIRE, n); if (r < 0) { if (errno == EEXIST) return sd_bus_reply_method_return(m, "u", BUS_NAME_EXISTS); if (errno == EALREADY) return sd_bus_reply_method_return(m, "u", BUS_NAME_ALREADY_OWNER); return -errno; } if (n->flags & KDBUS_NAME_IN_QUEUE) return sd_bus_reply_method_return(m, "u", BUS_NAME_IN_QUEUE); return sd_bus_reply_method_return(m, "u", BUS_NAME_PRIMARY_OWNER); } static int driver_release_name(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { struct kdbus_cmd_name *n; const char *name; size_t l, size; uint64_t id; int r; r = sd_bus_message_read(m, "s", &name); if (r < 0) return r; assert_return(service_name_is_valid(name), -EINVAL); l = strlen(name); size = offsetof(struct kdbus_cmd_name, name) + l + 1; n = alloca0(size); n->size = size; memcpy(n->name, name, l+1); /* This function is open-coded because we request the name 'on behalf' * of the requesting connection */ r = bus_kernel_parse_unique_name(m->sender, &id); if (r < 0) return r; n->id = id; r = ioctl(bus->input_fd, KDBUS_CMD_NAME_RELEASE, n); if (r < 0) { if (errno == ESRCH) return sd_bus_reply_method_return(m, "u", BUS_NAME_NON_EXISTENT); if (errno == EADDRINUSE) return sd_bus_reply_method_return(m, "u", BUS_NAME_NOT_OWNER); return -errno; } return sd_bus_reply_method_return(m, "u", BUS_NAME_RELEASED); } static int driver_start_service_by_name(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; _cleanup_strv_free_ char **t = NULL; _cleanup_free_ char *path = NULL; uint32_t flags; char *name, *u; int r; r = sd_bus_message_read(m, "su", &name, &flags); if (r < 0) return r; assert_return(service_name_is_valid(name), -EINVAL); assert_return(flags == 0, -ENOTSUP); r = sd_bus_get_owner(bus, name, 0, NULL); if (r >= 0) return sd_bus_reply_method_return(m, "u", BUS_START_REPLY_ALREADY_RUNNING); if (r != -ENOENT) return r; u = strappenda(name, ".busname"); path = unit_dbus_path_from_name(u); if (!path) return -ENOMEM; r = sd_bus_get_property_strv( bus, "org.freedesktop.systemd1", path, "org.freedesktop.systemd1.Unit", "Triggers", error, &t); if (r < 0) return r; if (!t[0] || t[1]) return -EIO; r = sd_bus_call_method( bus, "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit", error, &reply, "ss", t[0], "replace"); if (r < 0) return r; return sd_bus_reply_method_return(m, "u", BUS_START_REPLY_SUCCESS); } static int driver_unsupported(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "%s() is not supported", sd_bus_message_get_member(m)); } static const sd_bus_vtable driver_vtable[] = { SD_BUS_VTABLE_START(0), SD_BUS_METHOD("AddMatch", "s", NULL, driver_add_match, 0), SD_BUS_METHOD("GetConnectionSELinuxSecurityContext", "s", "ay", driver_get_security_ctx, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("GetConnectionUnixProcessID", "s", "u", driver_get_pid, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("GetConnectionUnixUser", "s", "u", driver_get_user, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("GetId", NULL, "s", driver_get_id, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("GetNameOwner", "s", "s", driver_get_name_owner, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("Hello", NULL, "s", driver_hello, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("ListActivatableNames", NULL, "as", driver_list_activatable_names, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("ListNames", NULL, "as", driver_list_names, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("ListQueuedOwners", "s", "as", driver_list_queued_owners, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("NameHasOwner", "s", "b", driver_name_has_owner, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("ReleaseName", "s", "u", driver_release_name, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("ReloadConfig", NULL, NULL, driver_unsupported, SD_BUS_VTABLE_DEPRECATED), SD_BUS_METHOD("RemoveMatch", "s", NULL, driver_remove_match, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("RequestName", "su", "u", driver_request_name, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("StartServiceByName", "su", "u", driver_start_service_by_name, SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD("UpdateActivationEnvironment", "a{ss}", NULL, driver_unsupported, SD_BUS_VTABLE_DEPRECATED), SD_BUS_SIGNAL("NameAcquired", "s", SD_BUS_VTABLE_DEPRECATED), SD_BUS_SIGNAL("NameLost", "s", SD_BUS_VTABLE_DEPRECATED), SD_BUS_SIGNAL("NameOwnerChanged", "sss", 0), SD_BUS_VTABLE_END }; static int connect_bus(sd_event *event, sd_bus **_bus) { _cleanup_bus_unref_ sd_bus *bus = NULL; int r; assert(event); assert(_bus); r = sd_bus_default_system(&bus); if (r < 0) { log_error("Failed to create bus: %s", strerror(-r)); return r; } if (!bus->is_kernel) { log_error("Not running on kdbus"); return -EPERM; } r = sd_bus_add_object_vtable(bus, "/org/freedesktop/DBus", "org.freedesktop.DBus", driver_vtable, NULL); if (r < 0) { log_error("Failed to add manager object vtable: %s", strerror(-r)); return r; } r = sd_bus_request_name(bus, "org.freedesktop.DBus", 0); if (r < 0) { log_error("Unable to request name: %s\n", strerror(-r)); return r; } r = sd_bus_attach_event(bus, event, 0); if (r < 0) { log_error("Error %d while adding bus to even: %s", r, strerror(-r)); return r; } *_bus = bus; bus = NULL; return 0; } int main(int argc, char *argv[]) { _cleanup_event_unref_ sd_event *event = NULL; _cleanup_bus_unref_ sd_bus *bus = NULL; int r; log_set_target(LOG_TARGET_AUTO); log_parse_environment(); log_open(); if (argc != 1) { log_error("This program takes no arguments."); r = -EINVAL; goto finish; } r = sd_event_default(&event); if (r < 0) { log_error("Failed to allocate event loop: %s", strerror(-r)); goto finish; } sd_event_set_watchdog(event, true); r = connect_bus(event, &bus); if (r < 0) goto finish; r = bus_event_loop_with_idle(event, bus, "org.freedesktop.DBus", DEFAULT_EXIT_USEC); if (r < 0) { log_error("Failed to run event loop: %s", strerror(-r)); goto finish; } finish: return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; }