diff options
Diffstat (limited to 'src/shared/dbus-common.c')
| -rw-r--r-- | src/shared/dbus-common.c | 1326 |
1 files changed, 1326 insertions, 0 deletions
diff --git a/src/shared/dbus-common.c b/src/shared/dbus-common.c new file mode 100644 index 0000000000..ee281e57f4 --- /dev/null +++ b/src/shared/dbus-common.c @@ -0,0 +1,1326 @@ +/*-*- 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@%s,argv3=systemd-stdio-bridge", user, host); + else if (user) + asprintf(&p, "unixexec:path=ssh,argv1=-xT,argv2=%s@localhost,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_message_or_strerror(const DBusError *error, int err) { + + if (error && dbus_error_is_set(error)) + return bus_error_message(error); + + return strerror(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 (!dbus_connection_send(c, reply, NULL)) + 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; +} + +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 (!dbus_connection_send(c, reply, NULL)) + 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_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)); + } 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 + 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"; +} |