443 lines
14 KiB
C
443 lines
14 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "bus-internal.h"
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#include "bus-message.h"
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#include "bus-signature.h"
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#include "bus-util.h"
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#include "bus-type.h"
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_public_ int sd_bus_emit_signal(
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sd_bus *bus,
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const char *path,
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const char *interface,
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const char *member,
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const char *types, ...) {
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_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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int r;
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assert_return(bus, -EINVAL);
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assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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r = sd_bus_message_new_signal(bus, path, interface, member, &m);
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if (r < 0)
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return r;
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if (!isempty(types)) {
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va_list ap;
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va_start(ap, types);
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r = bus_message_append_ap(m, types, ap);
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va_end(ap);
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if (r < 0)
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return r;
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}
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return sd_bus_send(bus, m, NULL);
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}
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_public_ int sd_bus_call_method(
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sd_bus *bus,
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const char *destination,
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const char *path,
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const char *interface,
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const char *member,
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sd_bus_error *error,
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sd_bus_message **reply,
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const char *types, ...) {
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_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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int r;
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assert_return(bus, -EINVAL);
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assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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r = sd_bus_message_new_method_call(bus, destination, path, interface, member, &m);
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if (r < 0)
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return r;
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if (!isempty(types)) {
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va_list ap;
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va_start(ap, types);
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r = bus_message_append_ap(m, types, ap);
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va_end(ap);
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if (r < 0)
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return r;
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}
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return sd_bus_call(bus, m, 0, error, reply);
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}
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_public_ int sd_bus_reply_method_return(
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sd_bus_message *call,
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const char *types, ...) {
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_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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int r;
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assert_return(call, -EINVAL);
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assert_return(call->sealed, -EPERM);
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assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
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assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(call->bus), -ECHILD);
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if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
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return 0;
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r = sd_bus_message_new_method_return(call, &m);
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if (r < 0)
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return r;
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if (!isempty(types)) {
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va_list ap;
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va_start(ap, types);
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r = bus_message_append_ap(m, types, ap);
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va_end(ap);
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if (r < 0)
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return r;
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}
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return sd_bus_send(call->bus, m, NULL);
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}
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_public_ int sd_bus_reply_method_error(
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sd_bus_message *call,
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const sd_bus_error *e) {
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_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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int r;
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assert_return(call, -EINVAL);
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assert_return(call->sealed, -EPERM);
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assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
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assert_return(sd_bus_error_is_set(e), -EINVAL);
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assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(call->bus), -ECHILD);
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if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
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return 0;
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r = sd_bus_message_new_method_error(call, e, &m);
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if (r < 0)
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return r;
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return sd_bus_send(call->bus, m, NULL);
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}
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_public_ int sd_bus_reply_method_errorf(
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sd_bus_message *call,
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const char *name,
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const char *format,
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...) {
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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va_list ap;
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assert_return(call, -EINVAL);
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assert_return(call->sealed, -EPERM);
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assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
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assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(call->bus), -ECHILD);
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if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
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return 0;
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va_start(ap, format);
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bus_error_setfv(&error, name, format, ap);
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va_end(ap);
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return sd_bus_reply_method_error(call, &error);
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}
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_public_ int sd_bus_reply_method_errno(
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sd_bus_message *call,
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int error,
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const sd_bus_error *p) {
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_cleanup_bus_error_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
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assert_return(call, -EINVAL);
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assert_return(call->sealed, -EPERM);
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assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
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assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(call->bus), -ECHILD);
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if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
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return 0;
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if (sd_bus_error_is_set(p))
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return sd_bus_reply_method_error(call, p);
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sd_bus_error_set_errno(&berror, error);
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return sd_bus_reply_method_error(call, &berror);
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}
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_public_ int sd_bus_reply_method_errnof(
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sd_bus_message *call,
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int error,
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const char *format,
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...) {
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_cleanup_bus_error_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
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va_list ap;
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assert_return(call, -EINVAL);
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assert_return(call->sealed, -EPERM);
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assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
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assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(call->bus), -ECHILD);
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if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
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return 0;
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va_start(ap, format);
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bus_error_set_errnofv(&berror, error, format, ap);
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va_end(ap);
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return sd_bus_reply_method_error(call, &berror);
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}
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_public_ int sd_bus_get_property(
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sd_bus *bus,
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const char *destination,
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const char *path,
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const char *interface,
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const char *member,
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sd_bus_error *error,
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sd_bus_message **reply,
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const char *type) {
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sd_bus_message *rep = NULL;
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int r;
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assert_return(bus, -EINVAL);
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assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL);
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assert_return(member_name_is_valid(member), -EINVAL);
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assert_return(reply, -EINVAL);
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assert_return(signature_is_single(type, false), -EINVAL);
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assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &rep, "ss", strempty(interface), member);
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if (r < 0)
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return r;
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r = sd_bus_message_enter_container(rep, 'v', type);
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if (r < 0) {
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sd_bus_message_unref(rep);
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return r;
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}
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*reply = rep;
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return 0;
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}
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_public_ int sd_bus_get_property_trivial(
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sd_bus *bus,
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const char *destination,
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const char *path,
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const char *interface,
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const char *member,
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sd_bus_error *error,
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char type, void *ptr) {
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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int r;
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assert_return(bus, -EINVAL);
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assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL);
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assert_return(member_name_is_valid(member), -EINVAL);
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assert_return(bus_type_is_trivial(type), -EINVAL);
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assert_return(ptr, -EINVAL);
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assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &reply, "ss", strempty(interface), member);
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if (r < 0)
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return r;
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r = sd_bus_message_enter_container(reply, 'v', CHAR_TO_STR(type));
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if (r < 0)
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return r;
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r = sd_bus_message_read_basic(reply, type, ptr);
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if (r < 0)
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return r;
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return 0;
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}
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_public_ int sd_bus_get_property_string(
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sd_bus *bus,
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const char *destination,
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const char *path,
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const char *interface,
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const char *member,
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sd_bus_error *error,
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char **ret) {
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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const char *s;
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char *n;
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int r;
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assert_return(bus, -EINVAL);
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assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL);
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assert_return(member_name_is_valid(member), -EINVAL);
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assert_return(ret, -EINVAL);
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assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &reply, "ss", strempty(interface), member);
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if (r < 0)
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return r;
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r = sd_bus_message_enter_container(reply, 'v', "s");
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if (r < 0)
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return r;
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r = sd_bus_message_read_basic(reply, 's', &s);
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if (r < 0)
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return r;
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n = strdup(s);
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 0;
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}
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_public_ int sd_bus_get_property_strv(
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sd_bus *bus,
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const char *destination,
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const char *path,
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const char *interface,
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const char *member,
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sd_bus_error *error,
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char ***ret) {
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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int r;
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assert_return(bus, -EINVAL);
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assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL);
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assert_return(member_name_is_valid(member), -EINVAL);
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assert_return(ret, -EINVAL);
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assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &reply, "ss", strempty(interface), member);
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if (r < 0)
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return r;
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r = sd_bus_message_enter_container(reply, 'v', NULL);
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if (r < 0)
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return r;
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r = sd_bus_message_read_strv(reply, ret);
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if (r < 0)
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return r;
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return 0;
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}
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_public_ int sd_bus_set_property(
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sd_bus *bus,
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const char *destination,
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const char *path,
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const char *interface,
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const char *member,
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sd_bus_error *error,
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const char *type, ...) {
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_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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va_list ap;
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int r;
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assert_return(bus, -EINVAL);
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assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL);
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assert_return(member_name_is_valid(member), -EINVAL);
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assert_return(signature_is_single(type, false), -EINVAL);
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assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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r = sd_bus_message_new_method_call(bus, destination, path, "org.freedesktop.DBus.Properties", "Set", &m);
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if (r < 0)
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return r;
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r = sd_bus_message_append(m, "ss", strempty(interface), member);
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if (r < 0)
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return r;
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r = sd_bus_message_open_container(m, 'v', type);
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if (r < 0)
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return r;
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va_start(ap, type);
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r = bus_message_append_ap(m, type, ap);
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va_end(ap);
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if (r < 0)
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return r;
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r = sd_bus_message_close_container(m);
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if (r < 0)
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return r;
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return sd_bus_call(bus, m, 0, error, NULL);
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}
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_public_ int sd_bus_query_sender_creds(sd_bus_message *call, uint64_t mask, sd_bus_creds **creds) {
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sd_bus_creds *c;
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assert_return(call, -EINVAL);
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assert_return(call->sealed, -EPERM);
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assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(call->bus), -ECHILD);
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c = sd_bus_message_get_creds(call);
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/* All data we need? */
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if (c && (mask & ~c->mask) == 0) {
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*creds = sd_bus_creds_ref(c);
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return 0;
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}
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/* No data passed? Or not enough data passed to retrieve the missing bits? */
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if (!c || !(c->mask & SD_BUS_CREDS_PID)) {
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/* We couldn't read anything from the call, let's try
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* to get it from the sender or peer */
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if (call->sender)
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return sd_bus_get_owner(call->bus, call->sender, mask, creds);
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else
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return sd_bus_get_peer_creds(call->bus, mask, creds);
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}
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return bus_creds_extend_by_pid(c, mask, creds);
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}
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