/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering 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 <assert.h> #include <sys/socket.h> #include <errno.h> #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <dbus/dbus.h> #include <string.h> #include <sys/epoll.h> #include "log.h" #include "dbus-common.h" #include "util.h" #include "missing.h" #include "def.h" #include "strv.h" int bus_check_peercred(DBusConnection *c) { int fd; struct ucred ucred; socklen_t l; assert(c); assert_se(dbus_connection_get_unix_fd(c, &fd)); l = sizeof(struct ucred); if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0) { log_error("SO_PEERCRED failed: %m"); return -errno; } if (l != sizeof(struct ucred)) { log_error("SO_PEERCRED returned wrong size."); return -E2BIG; } if (ucred.uid != 0 && ucred.uid != geteuid()) return -EPERM; return 1; } static int sync_auth(DBusConnection *bus, DBusError *error) { usec_t begin, tstamp; assert(bus); /* This complexity should probably move into D-Bus itself: * * https://bugs.freedesktop.org/show_bug.cgi?id=35189 */ begin = tstamp = now(CLOCK_MONOTONIC); for (;;) { if (tstamp > begin + DEFAULT_TIMEOUT_USEC) break; if (dbus_connection_get_is_authenticated(bus)) break; if (!dbus_connection_read_write_dispatch(bus, ((begin + DEFAULT_TIMEOUT_USEC - tstamp) + USEC_PER_MSEC - 1) / USEC_PER_MSEC)) break; tstamp = now(CLOCK_MONOTONIC); } if (!dbus_connection_get_is_connected(bus)) { dbus_set_error_const(error, DBUS_ERROR_NO_SERVER, "Connection terminated during authentication."); return -ECONNREFUSED; } if (!dbus_connection_get_is_authenticated(bus)) { dbus_set_error_const(error, DBUS_ERROR_TIMEOUT, "Failed to authenticate in time."); return -EACCES; } return 0; } int bus_connect(DBusBusType t, DBusConnection **_bus, bool *_private, DBusError *error) { DBusConnection *bus = NULL; int r; bool private = true; assert(_bus); if (geteuid() == 0 && t == DBUS_BUS_SYSTEM) { /* If we are root, then let's talk directly to the * system instance, instead of going via the bus */ bus = dbus_connection_open_private("unix:path=/run/systemd/private", error); if (!bus) return -EIO; } else { if (t == DBUS_BUS_SESSION) { const char *e; /* If we are supposed to talk to the instance, * try via XDG_RUNTIME_DIR first, then * fallback to normal bus access */ e = secure_getenv("XDG_RUNTIME_DIR"); if (e) { char *p; if (asprintf(&p, "unix:path=%s/systemd/private", e) < 0) return -ENOMEM; bus = dbus_connection_open_private(p, NULL); free(p); } } if (!bus) { bus = dbus_bus_get_private(t, error); if (!bus) return -EIO; private = false; } } dbus_connection_set_exit_on_disconnect(bus, FALSE); if (private) { if (bus_check_peercred(bus) < 0) { dbus_connection_close(bus); dbus_connection_unref(bus); dbus_set_error_const(error, DBUS_ERROR_ACCESS_DENIED, "Failed to verify owner of bus."); return -EACCES; } } r = sync_auth(bus, error); if (r < 0) { dbus_connection_close(bus); dbus_connection_unref(bus); return r; } if (_private) *_private = private; *_bus = bus; return 0; } int bus_connect_system_ssh(const char *user, const char *host, DBusConnection **_bus, DBusError *error) { DBusConnection *bus; char *p = NULL; int r; assert(_bus); assert(user || host); if (user && host) asprintf(&p, "unixexec:path=ssh,argv1=-xT,argv2=%s%%40%s,argv3=systemd-stdio-bridge", user, host); else if (user) asprintf(&p, "unixexec:path=ssh,argv1=-xT,argv2=%s%%40localhost,argv3=systemd-stdio-bridge", user); else if (host) asprintf(&p, "unixexec:path=ssh,argv1=-xT,argv2=%s,argv3=systemd-stdio-bridge", host); if (!p) { dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL); return -ENOMEM; } bus = dbus_connection_open_private(p, error); free(p); if (!bus) return -EIO; dbus_connection_set_exit_on_disconnect(bus, FALSE); if ((r = sync_auth(bus, error)) < 0) { dbus_connection_close(bus); dbus_connection_unref(bus); return r; } if (!dbus_bus_register(bus, error)) { dbus_connection_close(bus); dbus_connection_unref(bus); return r; } *_bus = bus; return 0; } int bus_connect_system_polkit(DBusConnection **_bus, DBusError *error) { DBusConnection *bus; int r; assert(_bus); /* Don't bother with PolicyKit if we are root */ if (geteuid() == 0) return bus_connect(DBUS_BUS_SYSTEM, _bus, NULL, error); bus = dbus_connection_open_private("unixexec:path=pkexec,argv1=" SYSTEMD_STDIO_BRIDGE_BINARY_PATH, error); if (!bus) return -EIO; dbus_connection_set_exit_on_disconnect(bus, FALSE); r = sync_auth(bus, error); if (r < 0) { dbus_connection_close(bus); dbus_connection_unref(bus); return r; } if (!dbus_bus_register(bus, error)) { dbus_connection_close(bus); dbus_connection_unref(bus); return r; } *_bus = bus; return 0; } const char *bus_error_message(const DBusError *error) { if (!error) return NULL; /* Sometimes the D-Bus server is a little bit too verbose with * its error messages, so let's override them here */ if (dbus_error_has_name(error, DBUS_ERROR_ACCESS_DENIED)) return "Access denied"; return error->message; } const char *bus_error(const DBusError *error, int err) { if (error && dbus_error_is_set(error)) return bus_error_message(error); return strerror(err < 0 ? -err : err); } DBusHandlerResult bus_default_message_handler( DBusConnection *c, DBusMessage *message, const char *introspection, const char *interfaces, const BusBoundProperties *bound_properties) { DBusError error; _cleanup_dbus_message_unref_ DBusMessage *reply = NULL; int r; assert(c); assert(message); dbus_error_init(&error); if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) { reply = dbus_message_new_method_return(message); if (!reply) goto oom; if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) goto oom; } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && bound_properties) { const char *interface, *property; const BusBoundProperties *bp; const BusProperty *p; void *data; DBusMessageIter iter, sub; if (!dbus_message_get_args( message, &error, DBUS_TYPE_STRING, &interface, DBUS_TYPE_STRING, &property, DBUS_TYPE_INVALID)) return bus_send_error_reply(c, message, &error, -EINVAL); for (bp = bound_properties; bp->interface; bp++) { if (!streq(bp->interface, interface)) continue; for (p = bp->properties; p->property; p++) if (streq(p->property, property)) goto get_prop; } /* no match */ if (!nulstr_contains(interfaces, interface)) dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_INTERFACE, "Unknown interface"); else dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_PROPERTY, "Unknown property"); return bus_send_error_reply(c, message, &error, -EINVAL); get_prop: reply = dbus_message_new_method_return(message); if (!reply) goto oom; dbus_message_iter_init_append(reply, &iter); if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub)) goto oom; data = (char*)bp->base + p->offset; if (p->indirect) data = *(void**)data; r = p->append(&sub, property, data); if (r == -ENOMEM) goto oom; if (r < 0) return bus_send_error_reply(c, message, NULL, r); if (!dbus_message_iter_close_container(&iter, &sub)) goto oom; } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && bound_properties) { const char *interface; const BusBoundProperties *bp; const BusProperty *p; DBusMessageIter iter, sub, sub2, sub3; if (!dbus_message_get_args( message, &error, DBUS_TYPE_STRING, &interface, DBUS_TYPE_INVALID)) return bus_send_error_reply(c, message, &error, -EINVAL); if (interface[0] && !nulstr_contains(interfaces, interface)) { dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_INTERFACE, "Unknown interface"); return bus_send_error_reply(c, message, &error, -EINVAL); } reply = dbus_message_new_method_return(message); if (!reply) goto oom; dbus_message_iter_init_append(reply, &iter); if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub)) goto oom; for (bp = bound_properties; bp->interface; bp++) { if (interface[0] && !streq(bp->interface, interface)) continue; for (p = bp->properties; p->property; p++) { void *data; if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) || !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) || !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3)) goto oom; data = (char*)bp->base + p->offset; if (p->indirect) data = *(void**)data; r = p->append(&sub3, p->property, data); if (r == -ENOMEM) goto oom; if (r < 0) return bus_send_error_reply(c, message, NULL, r); if (!dbus_message_iter_close_container(&sub2, &sub3) || !dbus_message_iter_close_container(&sub, &sub2)) goto oom; } } if (!dbus_message_iter_close_container(&iter, &sub)) goto oom; } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Set") && bound_properties) { const char *interface, *property; DBusMessageIter iter; const BusBoundProperties *bp; const BusProperty *p; DBusMessageIter sub; char *sig; void *data; DBusMessage *changed; if (!dbus_message_iter_init(message, &iter) || dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING) return bus_send_error_reply(c, message, NULL, -EINVAL); dbus_message_iter_get_basic(&iter, &interface); if (!dbus_message_iter_next(&iter) || dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING) return bus_send_error_reply(c, message, NULL, -EINVAL); dbus_message_iter_get_basic(&iter, &property); if (!dbus_message_iter_next(&iter) || dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT || dbus_message_iter_has_next(&iter)) return bus_send_error_reply(c, message, NULL, -EINVAL); for (bp = bound_properties; bp->interface; bp++) { if (!streq(bp->interface, interface)) continue; for (p = bp->properties; p->property; p++) if (streq(p->property, property)) goto set_prop; } /* no match */ if (!nulstr_contains(interfaces, interface)) dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_INTERFACE, "Unknown interface"); else dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_PROPERTY, "Unknown property"); return bus_send_error_reply(c, message, &error, -EINVAL); set_prop: if (!p->set) { dbus_set_error_const(&error, DBUS_ERROR_PROPERTY_READ_ONLY, "Property read-only"); return bus_send_error_reply(c, message, &error, -EINVAL); } dbus_message_iter_recurse(&iter, &sub); sig = dbus_message_iter_get_signature(&sub); if (!sig) goto oom; if (!streq(sig, p->signature)) { dbus_free(sig); return bus_send_error_reply(c, message, NULL, -EINVAL); } dbus_free(sig); data = (uint8_t*) bp->base + p->offset; if (p->indirect) data = *(void**)data; r = p->set(&sub, property, data); if (r == -ENOMEM) goto oom; else if (r < 0) return bus_send_error_reply(c, message, NULL, r); reply = dbus_message_new_method_return(message); if (!reply) goto oom; /* Send out a signal about this, but it doesn't really * matter if this fails, so eat all errors */ changed = bus_properties_changed_one_new( dbus_message_get_path(message), interface, property); if (changed) { dbus_connection_send(c, changed, NULL); dbus_message_unref(changed); } } else { const char *interface = dbus_message_get_interface(message); if (!interface || !nulstr_contains(interfaces, interface)) { dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_INTERFACE, "Unknown interface"); return bus_send_error_reply(c, message, &error, -EINVAL); } } if (reply) { if (!bus_maybe_send_reply(c, message, reply)) goto oom; return DBUS_HANDLER_RESULT_HANDLED; } return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; oom: dbus_error_free(&error); return DBUS_HANDLER_RESULT_NEED_MEMORY; } int bus_property_append_string(DBusMessageIter *i, const char *property, void *data) { const char *t = data; assert(i); assert(property); if (!t) t = ""; if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t)) return -ENOMEM; return 0; } int bus_property_append_strv(DBusMessageIter *i, const char *property, void *data) { char **t = data; assert(i); assert(property); return bus_append_strv_iter(i, t); } int bus_property_append_bool(DBusMessageIter *i, const char *property, void *data) { bool *b = data; dbus_bool_t db; assert(i); assert(property); assert(b); db = *b; if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db)) return -ENOMEM; return 0; } int bus_property_append_tristate_false(DBusMessageIter *i, const char *property, void *data) { int *b = data; dbus_bool_t db; assert(i); assert(property); assert(b); db = *b > 0; if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db)) return -ENOMEM; return 0; } int bus_property_append_uint64(DBusMessageIter *i, const char *property, void *data) { assert(i); assert(property); assert(data); /* Let's ensure that usec_t is actually 64bit, and hence this * function can be used for usec_t */ assert_cc(sizeof(uint64_t) == sizeof(usec_t)); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data)) return -ENOMEM; return 0; } int bus_property_append_uint32(DBusMessageIter *i, const char *property, void *data) { assert(i); assert(property); assert(data); /* Let's ensure that pid_t, mode_t, uid_t, gid_t are actually * 32bit, and hence this function can be used for * pid_t/mode_t/uid_t/gid_t */ assert_cc(sizeof(uint32_t) == sizeof(pid_t)); assert_cc(sizeof(uint32_t) == sizeof(mode_t)); assert_cc(sizeof(uint32_t) == sizeof(unsigned)); assert_cc(sizeof(uint32_t) == sizeof(uid_t)); assert_cc(sizeof(uint32_t) == sizeof(gid_t)); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data)) return -ENOMEM; return 0; } int bus_property_append_int32(DBusMessageIter *i, const char *property, void *data) { assert(i); assert(property); assert(data); assert_cc(sizeof(int32_t) == sizeof(int)); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, data)) return -ENOMEM; return 0; } int bus_property_append_size(DBusMessageIter *i, const char *property, void *data) { uint64_t u; assert(i); assert(property); assert(data); u = (uint64_t) *(size_t*) data; if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u)) return -ENOMEM; return 0; } int bus_property_append_ul(DBusMessageIter *i, const char *property, void *data) { uint64_t u; assert(i); assert(property); assert(data); u = (uint64_t) *(unsigned long*) data; if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u)) return -ENOMEM; return 0; } int bus_property_append_long(DBusMessageIter *i, const char *property, void *data) { int64_t l; assert(i); assert(property); assert(data); l = (int64_t) *(long*) data; if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT64, &l)) return -ENOMEM; return 0; } int bus_property_set_uint64(DBusMessageIter *i, const char *property, void *data) { uint64_t *t = data; assert(i); assert(property); dbus_message_iter_get_basic(i, t); return 0; } const char *bus_errno_to_dbus(int error) { switch(error) { case -EINVAL: return DBUS_ERROR_INVALID_ARGS; case -ENOMEM: return DBUS_ERROR_NO_MEMORY; case -EPERM: case -EACCES: return DBUS_ERROR_ACCESS_DENIED; case -ESRCH: return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN; case -ENOENT: return DBUS_ERROR_FILE_NOT_FOUND; case -EEXIST: return DBUS_ERROR_FILE_EXISTS; case -ETIMEDOUT: case -ETIME: return DBUS_ERROR_TIMEOUT; case -EIO: return DBUS_ERROR_IO_ERROR; case -ENETRESET: case -ECONNABORTED: case -ECONNRESET: return DBUS_ERROR_DISCONNECTED; } return DBUS_ERROR_FAILED; } dbus_bool_t bus_maybe_send_reply (DBusConnection *c, DBusMessage *message, DBusMessage *reply) { /* Some parts of systemd "reply" to signals, which of course * have the no-reply flag set. We will be defensive here and * still send out a reply if we're passed a signal. */ if (dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_METHOD_CALL && dbus_message_get_no_reply(message)) return TRUE; return dbus_connection_send(c, reply, NULL); } DBusHandlerResult bus_send_error_reply(DBusConnection *c, DBusMessage *message, DBusError *berror, int error) { _cleanup_dbus_message_unref_ DBusMessage *reply = NULL; const char *name, *text; if (berror && dbus_error_is_set(berror)) { name = berror->name; text = berror->message; } else { name = bus_errno_to_dbus(error); text = strerror(-error); } reply = dbus_message_new_error(message, name, text); if (!reply) goto oom; if (!bus_maybe_send_reply(c, message, reply)) goto oom; if (berror) dbus_error_free(berror); return DBUS_HANDLER_RESULT_HANDLED; oom: if (reply) dbus_message_unref(reply); if (berror) dbus_error_free(berror); return DBUS_HANDLER_RESULT_NEED_MEMORY; } DBusMessage* bus_properties_changed_new(const char *path, const char *interface, const char *properties) { DBusMessage *m; DBusMessageIter iter, sub; const char *i; assert(interface); assert(properties); m = dbus_message_new_signal(path, "org.freedesktop.DBus.Properties", "PropertiesChanged"); if (!m) goto oom; dbus_message_iter_init_append(m, &iter); /* We won't send any property values, since they might be * large and sometimes not cheap to generated */ if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &interface) || !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub) || !dbus_message_iter_close_container(&iter, &sub) || !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "s", &sub)) goto oom; NULSTR_FOREACH(i, properties) if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &i)) goto oom; if (!dbus_message_iter_close_container(&iter, &sub)) goto oom; return m; oom: if (m) dbus_message_unref(m); return NULL; } DBusMessage* bus_properties_changed_one_new(const char *path, const char *interface, const char *property) { DBusMessage *m; DBusMessageIter iter, sub; assert(interface); assert(property); m = dbus_message_new_signal(path, "org.freedesktop.DBus.Properties", "PropertiesChanged"); if (!m) goto oom; dbus_message_iter_init_append(m, &iter); /* We won't send any property values, since they might be * large and sometimes not cheap to generated */ if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &interface) || !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub) || !dbus_message_iter_close_container(&iter, &sub) || !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "s", &sub)) goto oom; if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &property)) goto oom; if (!dbus_message_iter_close_container(&iter, &sub)) goto oom; return m; oom: if (m) dbus_message_unref(m); return NULL; } uint32_t bus_flags_to_events(DBusWatch *bus_watch) { unsigned flags; uint32_t events = 0; assert(bus_watch); /* no watch flags for disabled watches */ if (!dbus_watch_get_enabled(bus_watch)) return 0; flags = dbus_watch_get_flags(bus_watch); if (flags & DBUS_WATCH_READABLE) events |= EPOLLIN; if (flags & DBUS_WATCH_WRITABLE) events |= EPOLLOUT; return events | EPOLLHUP | EPOLLERR; } unsigned bus_events_to_flags(uint32_t events) { unsigned flags = 0; if (events & EPOLLIN) flags |= DBUS_WATCH_READABLE; if (events & EPOLLOUT) flags |= DBUS_WATCH_WRITABLE; if (events & EPOLLHUP) flags |= DBUS_WATCH_HANGUP; if (events & EPOLLERR) flags |= DBUS_WATCH_ERROR; return flags; } int bus_parse_strv(DBusMessage *m, char ***_l) { DBusMessageIter iter; assert(m); assert(_l); if (!dbus_message_iter_init(m, &iter)) return -EINVAL; return bus_parse_strv_iter(&iter, _l); } int bus_parse_strv_iter(DBusMessageIter *iter, char ***_l) { DBusMessageIter sub; unsigned n = 0, i = 0; char **l; assert(iter); assert(_l); if (dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_ARRAY || dbus_message_iter_get_element_type(iter) != DBUS_TYPE_STRING) return -EINVAL; dbus_message_iter_recurse(iter, &sub); while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) { n++; dbus_message_iter_next(&sub); } l = new(char*, n+1); if (!l) return -ENOMEM; dbus_message_iter_recurse(iter, &sub); while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) { const char *s; assert_se(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING); dbus_message_iter_get_basic(&sub, &s); if (!(l[i++] = strdup(s))) { strv_free(l); return -ENOMEM; } dbus_message_iter_next(&sub); } assert(i == n); l[i] = NULL; if (_l) *_l = l; return 0; } int bus_parse_strv_pairs_iter(DBusMessageIter *iter, char ***_l) { DBusMessageIter sub, sub2; unsigned n = 0, i = 0; char **l; assert(iter); assert(_l); if (dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_ARRAY || dbus_message_iter_get_element_type(iter) != DBUS_TYPE_STRUCT) return -EINVAL; dbus_message_iter_recurse(iter, &sub); while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) { n++; dbus_message_iter_next(&sub); } l = new(char*, n*2+1); if (!l) return -ENOMEM; dbus_message_iter_recurse(iter, &sub); while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) { const char *a, *b; assert_se(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRUCT); dbus_message_iter_recurse(&sub, &sub2); if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &a, true) < 0 || bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &b, false) < 0) return -EINVAL; l[i] = strdup(a); if (!l[i]) { strv_free(l); return -ENOMEM; } l[++i] = strdup(b); if (!l[i]) { strv_free(l); return -ENOMEM; } i++; dbus_message_iter_next(&sub); } assert(i == n*2); l[i] = NULL; if (_l) *_l = l; return 0; } int bus_parse_unit_info(DBusMessageIter *iter, struct unit_info *u) { DBusMessageIter sub; assert(iter); assert(u); if (dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_STRUCT) return -EINVAL; dbus_message_iter_recurse(iter, &sub); if (bus_iter_get_basic_and_next(&sub, DBUS_TYPE_STRING, &u->id, true) < 0 || bus_iter_get_basic_and_next(&sub, DBUS_TYPE_STRING, &u->description, true) < 0 || bus_iter_get_basic_and_next(&sub, DBUS_TYPE_STRING, &u->load_state, true) < 0 || bus_iter_get_basic_and_next(&sub, DBUS_TYPE_STRING, &u->active_state, true) < 0 || bus_iter_get_basic_and_next(&sub, DBUS_TYPE_STRING, &u->sub_state, true) < 0 || bus_iter_get_basic_and_next(&sub, DBUS_TYPE_STRING, &u->following, true) < 0 || bus_iter_get_basic_and_next(&sub, DBUS_TYPE_OBJECT_PATH, &u->unit_path, true) < 0 || bus_iter_get_basic_and_next(&sub, DBUS_TYPE_UINT32, &u->job_id, true) < 0 || bus_iter_get_basic_and_next(&sub, DBUS_TYPE_STRING, &u->job_type, true) < 0 || bus_iter_get_basic_and_next(&sub, DBUS_TYPE_OBJECT_PATH, &u->job_path, false) < 0) { log_error("Failed to parse reply."); return -EIO; } return 0; } int bus_append_strv_iter(DBusMessageIter *iter, char **l) { DBusMessageIter sub; assert(iter); if (!dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY, "s", &sub)) return -ENOMEM; STRV_FOREACH(l, l) if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, l)) return -ENOMEM; if (!dbus_message_iter_close_container(iter, &sub)) return -ENOMEM; return 0; } int bus_iter_get_basic_and_next(DBusMessageIter *iter, int type, void *data, bool next) { assert(iter); assert(data); if (dbus_message_iter_get_arg_type(iter) != type) return -EIO; dbus_message_iter_get_basic(iter, data); if (!dbus_message_iter_next(iter) != !next) return -EIO; return 0; } int generic_print_property(const char *name, DBusMessageIter *iter, bool all) { assert(name); assert(iter); switch (dbus_message_iter_get_arg_type(iter)) { case DBUS_TYPE_STRING: { const char *s; dbus_message_iter_get_basic(iter, &s); if (all || !isempty(s)) printf("%s=%s\n", name, s); return 1; } case DBUS_TYPE_BOOLEAN: { dbus_bool_t b; dbus_message_iter_get_basic(iter, &b); printf("%s=%s\n", name, yes_no(b)); return 1; } case DBUS_TYPE_UINT64: { uint64_t u; dbus_message_iter_get_basic(iter, &u); /* Yes, heuristics! But we can change this check * should it turn out to not be sufficient */ if (endswith(name, "Timestamp")) { char timestamp[FORMAT_TIMESTAMP_MAX], *t; t = format_timestamp(timestamp, sizeof(timestamp), u); if (t || all) printf("%s=%s\n", name, strempty(t)); } else if (strstr(name, "USec")) { char timespan[FORMAT_TIMESPAN_MAX]; printf("%s=%s\n", name, format_timespan(timespan, sizeof(timespan), u, 0)); } else printf("%s=%llu\n", name, (unsigned long long) u); return 1; } case DBUS_TYPE_UINT32: { uint32_t u; dbus_message_iter_get_basic(iter, &u); if (strstr(name, "UMask") || strstr(name, "Mode")) printf("%s=%04o\n", name, u); else printf("%s=%u\n", name, (unsigned) u); return 1; } case DBUS_TYPE_INT32: { int32_t i; dbus_message_iter_get_basic(iter, &i); printf("%s=%i\n", name, (int) i); return 1; } case DBUS_TYPE_DOUBLE: { double d; dbus_message_iter_get_basic(iter, &d); printf("%s=%g\n", name, d); return 1; } case DBUS_TYPE_ARRAY: if (dbus_message_iter_get_element_type(iter) == DBUS_TYPE_STRING) { DBusMessageIter sub; bool space = false; dbus_message_iter_recurse(iter, &sub); if (all || dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) { printf("%s=", name); while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) { const char *s; assert(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING); dbus_message_iter_get_basic(&sub, &s); printf("%s%s", space ? " " : "", s); space = true; dbus_message_iter_next(&sub); } puts(""); } return 1; } else if (dbus_message_iter_get_element_type(iter) == DBUS_TYPE_BYTE) { DBusMessageIter sub; dbus_message_iter_recurse(iter, &sub); if (all || dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) { printf("%s=", name); while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) { uint8_t u; assert(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_BYTE); dbus_message_iter_get_basic(&sub, &u); printf("%02x", u); dbus_message_iter_next(&sub); } puts(""); } return 1; } else if (dbus_message_iter_get_element_type(iter) == DBUS_TYPE_UINT32) { DBusMessageIter sub; dbus_message_iter_recurse(iter, &sub); if (all || dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) { printf("%s=", name); while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) { uint32_t u; assert(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_UINT32); dbus_message_iter_get_basic(&sub, &u); printf("%08x", u); dbus_message_iter_next(&sub); } puts(""); } return 1; } break; } return 0; } static void release_name_pending_cb(DBusPendingCall *pending, void *userdata) { DBusMessage *reply; DBusConnection *bus = userdata; assert_se(reply = dbus_pending_call_steal_reply(pending)); dbus_message_unref(reply); dbus_connection_close(bus); } void bus_async_unregister_and_exit(DBusConnection *bus, const char *name) { _cleanup_dbus_message_unref_ DBusMessage *m = NULL; DBusPendingCall *pending = NULL; assert(bus); /* We unregister the name here, but we continue to process * requests, until we get the response for it, so that all * requests are guaranteed to be processed. */ m = dbus_message_new_method_call( DBUS_SERVICE_DBUS, DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "ReleaseName"); if (!m) goto oom; if (!dbus_message_append_args( m, DBUS_TYPE_STRING, &name, DBUS_TYPE_INVALID)) goto oom; if (!dbus_connection_send_with_reply(bus, m, &pending, -1)) goto oom; if (!dbus_pending_call_set_notify(pending, release_name_pending_cb, bus, NULL)) goto oom; dbus_pending_call_unref(pending); return; oom: log_oom(); if (pending) { dbus_pending_call_cancel(pending); dbus_pending_call_unref(pending); } } DBusHandlerResult bus_exit_idle_filter(DBusConnection *bus, DBusMessage *m, void *userdata) { usec_t *remain_until = userdata; assert(bus); assert(m); assert(remain_until); /* Every time we get a new message we reset out timeout */ *remain_until = now(CLOCK_MONOTONIC) + DEFAULT_EXIT_USEC; if (dbus_message_is_signal(m, DBUS_INTERFACE_LOCAL, "Disconnected")) dbus_connection_close(bus); return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; } /* This mimics dbus_bus_get_unix_user() */ pid_t bus_get_unix_process_id( DBusConnection *connection, const char *name, DBusError *error) { _cleanup_dbus_message_unref_ DBusMessage *m = NULL, *reply = NULL; uint32_t pid = 0; m = dbus_message_new_method_call( DBUS_SERVICE_DBUS, DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "GetConnectionUnixProcessID"); if (!m) { dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL); return 0; } if (!dbus_message_append_args( m, DBUS_TYPE_STRING, &name, DBUS_TYPE_INVALID)) { dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL); return 0; } reply = dbus_connection_send_with_reply_and_block(connection, m, -1, error); if (!reply) return 0; if (dbus_set_error_from_message(error, reply)) return 0; if (!dbus_message_get_args( reply, error, DBUS_TYPE_UINT32, &pid, DBUS_TYPE_INVALID)) return 0; return (pid_t) pid; } bool bus_error_is_no_service(const DBusError *error) { assert(error); if (!dbus_error_is_set(error)) return false; if (dbus_error_has_name(error, DBUS_ERROR_NAME_HAS_NO_OWNER)) return true; if (dbus_error_has_name(error, DBUS_ERROR_SERVICE_UNKNOWN)) return true; return startswith(error->name, "org.freedesktop.DBus.Error.Spawn."); } int bus_method_call_with_reply( DBusConnection *bus, const char *destination, const char *path, const char *interface, const char *method, DBusMessage **return_reply, DBusError *return_error, int first_arg_type, ...) { DBusError error; _cleanup_dbus_message_unref_ DBusMessage *m = NULL; DBusMessage *reply; va_list ap; int r = 0; dbus_error_init(&error); assert(bus); m = dbus_message_new_method_call(destination, path, interface, method); if (!m) { r = log_oom(); goto finish; } va_start(ap, first_arg_type); if (!dbus_message_append_args_valist(m, first_arg_type, ap)) { va_end(ap); r = log_oom(); goto finish; } va_end(ap); reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error); if (!reply) { if (!return_error) log_error("Failed to issue method call: %s", bus_error_message(&error)); if (bus_error_is_no_service(&error)) r = -ENOENT; else if (dbus_error_has_name(&error, DBUS_ERROR_ACCESS_DENIED)) r = -EACCES; else if (dbus_error_has_name(&error, DBUS_ERROR_NO_REPLY)) r = -ETIMEDOUT; else if (dbus_error_has_name(&error, DBUS_ERROR_DISCONNECTED)) r = -ECONNRESET; else r = -EIO; goto finish; } if (return_reply) *return_reply = reply; else dbus_message_unref(reply); finish: if (return_error) *return_error = error; else dbus_error_free(&error); return r; } void bus_message_unrefp(DBusMessage **reply) { if (!reply) return; if (!*reply) return; dbus_message_unref(*reply); } const char *bus_message_get_sender_with_fallback(DBusMessage *m) { const char *s; assert(m); s = dbus_message_get_sender(m); if (s) return s; /* When the message came in from a direct connection the * message will have no sender. We fix that here. */ return ":no-sender"; }