--- /dev/null
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 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 "bus-internal.h"
+#include "bus-message.h"
+#include "bus-signature.h"
+#include "bus-util.h"
+#include "bus-type.h"
+
+_public_ int sd_bus_emit_signal(
+ sd_bus *bus,
+ const char *path,
+ const char *interface,
+ const char *member,
+ const char *types, ...) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ int r;
+
+ assert_return(bus, -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(bus->state))
+ return -ENOTCONN;
+
+ r = sd_bus_message_new_signal(bus, &m, path, interface, member);
+ if (r < 0)
+ return r;
+
+ if (!isempty(types)) {
+ va_list ap;
+
+ va_start(ap, types);
+ r = bus_message_append_ap(m, types, ap);
+ va_end(ap);
+ if (r < 0)
+ return r;
+ }
+
+ return sd_bus_send(bus, m, NULL);
+}
+
+_public_ int sd_bus_call_method(
+ sd_bus *bus,
+ const char *destination,
+ const char *path,
+ const char *interface,
+ const char *member,
+ sd_bus_error *error,
+ sd_bus_message **reply,
+ const char *types, ...) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ int r;
+
+ assert_return(bus, -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(bus->state))
+ return -ENOTCONN;
+
+ r = sd_bus_message_new_method_call(bus, &m, destination, path, interface, member);
+ if (r < 0)
+ return r;
+
+ if (!isempty(types)) {
+ va_list ap;
+
+ va_start(ap, types);
+ r = bus_message_append_ap(m, types, ap);
+ va_end(ap);
+ if (r < 0)
+ return r;
+ }
+
+ return sd_bus_call(bus, m, 0, error, reply);
+}
+
+_public_ int sd_bus_reply_method_return(
+ sd_bus_message *call,
+ const char *types, ...) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ int r;
+
+ assert_return(call, -EINVAL);
+ assert_return(call->sealed, -EPERM);
+ assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
+ assert_return(call->bus, -EINVAL);
+ assert_return(!bus_pid_changed(call->bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(call->bus->state))
+ return -ENOTCONN;
+
+ if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
+ return 0;
+
+ r = sd_bus_message_new_method_return(call, &m);
+ if (r < 0)
+ return r;
+
+ if (!isempty(types)) {
+ va_list ap;
+
+ va_start(ap, types);
+ r = bus_message_append_ap(m, types, ap);
+ va_end(ap);
+ if (r < 0)
+ return r;
+ }
+
+ return sd_bus_send(call->bus, m, NULL);
+}
+
+_public_ int sd_bus_reply_method_error(
+ sd_bus_message *call,
+ const sd_bus_error *e) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ int r;
+
+ assert_return(call, -EINVAL);
+ assert_return(call->sealed, -EPERM);
+ assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
+ assert_return(sd_bus_error_is_set(e), -EINVAL);
+ assert_return(call->bus, -EINVAL);
+ assert_return(!bus_pid_changed(call->bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(call->bus->state))
+ return -ENOTCONN;
+
+ if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
+ return 0;
+
+ r = sd_bus_message_new_method_error(call, &m, e);
+ if (r < 0)
+ return r;
+
+ return sd_bus_send(call->bus, m, NULL);
+}
+
+_public_ int sd_bus_reply_method_errorf(
+ sd_bus_message *call,
+ const char *name,
+ const char *format,
+ ...) {
+
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ va_list ap;
+
+ assert_return(call, -EINVAL);
+ assert_return(call->sealed, -EPERM);
+ assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
+ assert_return(call->bus, -EINVAL);
+ assert_return(!bus_pid_changed(call->bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(call->bus->state))
+ return -ENOTCONN;
+
+ if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
+ return 0;
+
+ va_start(ap, format);
+ bus_error_setfv(&error, name, format, ap);
+ va_end(ap);
+
+ return sd_bus_reply_method_error(call, &error);
+}
+
+_public_ int sd_bus_reply_method_errno(
+ sd_bus_message *call,
+ int error,
+ const sd_bus_error *p) {
+
+ _cleanup_bus_error_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
+
+ assert_return(call, -EINVAL);
+ assert_return(call->sealed, -EPERM);
+ assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
+ assert_return(call->bus, -EINVAL);
+ assert_return(!bus_pid_changed(call->bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(call->bus->state))
+ return -ENOTCONN;
+
+ if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
+ return 0;
+
+ if (sd_bus_error_is_set(p))
+ return sd_bus_reply_method_error(call, p);
+
+ sd_bus_error_set_errno(&berror, error);
+
+ return sd_bus_reply_method_error(call, &berror);
+}
+
+_public_ int sd_bus_reply_method_errnof(
+ sd_bus_message *call,
+ int error,
+ const char *format,
+ ...) {
+
+ _cleanup_bus_error_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
+ va_list ap;
+
+ assert_return(call, -EINVAL);
+ assert_return(call->sealed, -EPERM);
+ assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
+ assert_return(call->bus, -EINVAL);
+ assert_return(!bus_pid_changed(call->bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(call->bus->state))
+ return -ENOTCONN;
+
+ if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
+ return 0;
+
+ va_start(ap, format);
+ sd_bus_error_set_errnofv(&berror, error, format, ap);
+ va_end(ap);
+
+ return sd_bus_reply_method_error(call, &berror);
+}
+
+_public_ int sd_bus_get_property(
+ sd_bus *bus,
+ const char *destination,
+ const char *path,
+ const char *interface,
+ const char *member,
+ sd_bus_error *error,
+ sd_bus_message **reply,
+ const char *type) {
+
+ sd_bus_message *rep = NULL;
+ int r;
+
+ assert_return(bus, -EINVAL);
+ assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL);
+ assert_return(member_name_is_valid(member), -EINVAL);
+ assert_return(reply, -EINVAL);
+ assert_return(signature_is_single(type, false), -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(bus->state))
+ return -ENOTCONN;
+
+ r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &rep, "ss", strempty(interface), member);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_enter_container(rep, 'v', type);
+ if (r < 0) {
+ sd_bus_message_unref(rep);
+ return r;
+ }
+
+ *reply = rep;
+ return 0;
+}
+
+_public_ int sd_bus_get_property_trivial(
+ sd_bus *bus,
+ const char *destination,
+ const char *path,
+ const char *interface,
+ const char *member,
+ sd_bus_error *error,
+ char type, void *ptr) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+ int r;
+
+ assert_return(bus, -EINVAL);
+ assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL);
+ assert_return(member_name_is_valid(member), -EINVAL);
+ assert_return(bus_type_is_trivial(type), -EINVAL);
+ assert_return(ptr, -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(bus->state))
+ return -ENOTCONN;
+
+ r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &reply, "ss", strempty(interface), member);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_enter_container(reply, 'v', CHAR_TO_STR(type));
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_read_basic(reply, type, ptr);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+_public_ int sd_bus_get_property_string(
+ sd_bus *bus,
+ const char *destination,
+ const char *path,
+ const char *interface,
+ const char *member,
+ sd_bus_error *error,
+ char **ret) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+ const char *s;
+ char *n;
+ int r;
+
+ assert_return(bus, -EINVAL);
+ assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL);
+ assert_return(member_name_is_valid(member), -EINVAL);
+ assert_return(ret, -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(bus->state))
+ return -ENOTCONN;
+
+ r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &reply, "ss", strempty(interface), member);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_enter_container(reply, 'v', "s");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_read_basic(reply, 's', &s);
+ if (r < 0)
+ return r;
+
+ n = strdup(s);
+ if (!n)
+ return -ENOMEM;
+
+ *ret = n;
+ return 0;
+}
+
+_public_ int sd_bus_get_property_strv(
+ sd_bus *bus,
+ const char *destination,
+ const char *path,
+ const char *interface,
+ const char *member,
+ sd_bus_error *error,
+ char ***ret) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+ int r;
+
+ assert_return(bus, -EINVAL);
+ assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL);
+ assert_return(member_name_is_valid(member), -EINVAL);
+ assert_return(ret, -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(bus->state))
+ return -ENOTCONN;
+
+ r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &reply, "ss", strempty(interface), member);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_enter_container(reply, 'v', NULL);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_read_strv(reply, ret);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+_public_ int sd_bus_set_property(
+ sd_bus *bus,
+ const char *destination,
+ const char *path,
+ const char *interface,
+ const char *member,
+ sd_bus_error *error,
+ const char *type, ...) {
+
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ va_list ap;
+ int r;
+
+ assert_return(bus, -EINVAL);
+ assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL);
+ assert_return(member_name_is_valid(member), -EINVAL);
+ assert_return(signature_is_single(type, false), -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(bus->state))
+ return -ENOTCONN;
+
+ r = sd_bus_message_new_method_call(bus, &m, destination, path, "org.freedesktop.DBus.Properties", "Set");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append(m, "ss", strempty(interface), member);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(m, 'v', type);
+ if (r < 0)
+ return r;
+
+ va_start(ap, type);
+ r = bus_message_append_ap(m, type, ap);
+ va_end(ap);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_close_container(m);
+ if (r < 0)
+ return r;
+
+ return sd_bus_call(bus, m, 0, error, NULL);
+}
+
+_public_ int sd_bus_query_sender_creds(sd_bus_message *call, uint64_t mask, sd_bus_creds **creds) {
+ sd_bus_creds *c;
+
+ assert_return(call, -EINVAL);
+ assert_return(call->sealed, -EPERM);
+ assert_return(call->bus, -EINVAL);
+ assert_return(!bus_pid_changed(call->bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(call->bus->state))
+ return -ENOTCONN;
+
+ c = sd_bus_message_get_creds(call);
+
+ /* All data we need? */
+ if (c && (mask & ~c->mask) == 0) {
+ *creds = sd_bus_creds_ref(c);
+ return 0;
+ }
+
+ /* No data passed? Or not enough data passed to retrieve the missing bits? */
+ if (!c || !(c->mask & SD_BUS_CREDS_PID)) {
+ /* We couldn't read anything from the call, let's try
+ * to get it from the sender or peer */
+
+ if (call->sender)
+ return sd_bus_get_name_creds(call->bus, call->sender, mask, creds);
+ else
+ return sd_bus_get_owner_creds(call->bus, mask, creds);
+ }
+
+ return bus_creds_extend_by_pid(c, mask, creds);
+}
+
+_public_ int sd_bus_query_sender_privilege(sd_bus_message *call, int capability) {
+ _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
+ uid_t our_uid;
+ bool know_caps = false;
+ int r;
+
+ assert_return(call, -EINVAL);
+ assert_return(call->sealed, -EPERM);
+ assert_return(call->bus, -EINVAL);
+ assert_return(!bus_pid_changed(call->bus), -ECHILD);
+
+ if (!BUS_IS_OPEN(call->bus->state))
+ return -ENOTCONN;
+
+ if (capability >= 0) {
+ r = sd_bus_query_sender_creds(call, SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_EFFECTIVE_CAPS, &creds);
+ if (r < 0)
+ return r;
+
+ /* Note that not even on kdbus we might have the caps
+ * field, due to faked identities, or namespace
+ * translation issues. */
+ r = sd_bus_creds_has_effective_cap(creds, capability);
+ if (r > 0)
+ return 1;
+ if (r == 0)
+ know_caps = true;
+ } else {
+ r = sd_bus_query_sender_creds(call, SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID, &creds);
+ if (r < 0)
+ return r;
+ }
+
+ /* Now, check the UID, but only if the capability check wasn't
+ * sufficient */
+ our_uid = getuid();
+ if (our_uid != 0 || !know_caps || capability < 0) {
+ uid_t sender_uid;
+
+ /* Try to use the EUID, if we have it. */
+ r = sd_bus_creds_get_euid(creds, &sender_uid);
+ if (r < 0)
+ r = sd_bus_creds_get_uid(creds, &sender_uid);
+
+ if (r >= 0) {
+ /* Sender has same UID as us, then let's grant access */
+ if (sender_uid == our_uid)
+ return 1;
+
+ /* Sender is root, we are not root. */
+ if (our_uid != 0 && sender_uid == 0)
+ return 1;
+ }
+ }
+
+ return 0;
+}
~ianmdlvl / elogind.git / blobdiff