+++ /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