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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
Copyright 2013 Daniel Mack
Copyright 2014 Kay Sievers
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 <stddef.h>
#include "util.h"
#include "sd-bus.h"
#include "bus-internal.h"
#include "bus-message.h"
#include "bus-util.h"
#include "bus-match.h"
#include "synthesize.h"
int synthetic_driver_send(sd_bus *b, sd_bus_message *m) {
int r;
assert(b);
assert(m);
r = bus_message_append_sender(m, "org.freedesktop.DBus");
if (r < 0)
return r;
r = bus_seal_synthetic_message(b, m);
if (r < 0)
return r;
return sd_bus_send(b, m, NULL);
}
int synthetic_reply_method_error(sd_bus_message *call, const sd_bus_error *e) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
int r;
assert(call);
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 synthetic_driver_send(call->bus, m);
}
int synthetic_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;
va_start(ap, format);
bus_error_setfv(&error, name, format, ap);
va_end(ap);
return synthetic_reply_method_error(call, &error);
}
int synthetic_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(call);
if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
return 0;
if (sd_bus_error_is_set(p))
return synthetic_reply_method_error(call, p);
sd_bus_error_set_errno(&berror, error);
return synthetic_reply_method_error(call, &berror);
}
int synthetic_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(call);
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 synthetic_reply_method_error(call, &berror);
}
int synthetic_reply_method_return(sd_bus_message *call, const char *types, ...) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
int r;
assert(call);
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 synthetic_driver_send(call->bus, m);
}
int synthetic_reply_method_return_strv(sd_bus_message *call, char **l) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
int r;
assert(call);
if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
return 0;
r = sd_bus_message_new_method_return(call, &m);
if (r < 0)
return synthetic_reply_method_errno(call, r, NULL);
r = sd_bus_message_append_strv(m, l);
if (r < 0)
return synthetic_reply_method_errno(call, r, NULL);
return synthetic_driver_send(call->bus, m);
}
int synthesize_name_acquired(Proxy *p, sd_bus *a, sd_bus *b, sd_bus_message *m) {
_cleanup_bus_message_unref_ sd_bus_message *n = NULL;
const char *name, *old_owner, *new_owner;
int r;
assert(p);
assert(a);
assert(b);
assert(m);
/* If we get NameOwnerChanged for our own name, we need to
* synthesize NameLost/NameAcquired, since socket clients need
* that, even though it is obsoleted on kdbus */
if (!a->is_kernel)
return 0;
if (!sd_bus_message_is_signal(m, "org.freedesktop.DBus", "NameOwnerChanged") ||
!streq_ptr(m->path, "/org/freedesktop/DBus") ||
!streq_ptr(m->sender, "org.freedesktop.DBus"))
return 0;
r = sd_bus_message_read(m, "sss", &name, &old_owner, &new_owner);
if (r < 0)
return r;
r = sd_bus_message_rewind(m, true);
if (r < 0)
return r;
if (streq(old_owner, a->unique_name)) {
r = sd_bus_message_new_signal(
b,
&n,
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"NameLost");
} else if (streq(new_owner, a->unique_name)) {
r = sd_bus_message_new_signal(
b,
&n,
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"NameAcquired");
} else
return 0;
if (r < 0)
return r;
r = sd_bus_message_append(n, "s", name);
if (r < 0)
return r;
r = bus_message_append_sender(n, "org.freedesktop.DBus");
if (r < 0)
return r;
r = bus_seal_synthetic_message(b, n);
if (r < 0)
return r;
/*
* Make sure to only forward NameLost/NameAcquired messages if they
* match an installed MATCH rule of the local client. We really must
* not send messages the client doesn't expect.
*/
r = bus_match_run(b, &b->match_callbacks, n);
if (r >= 0 && p->message_matched)
r = sd_bus_send(b, n, NULL);
p->message_matched = false;
p->synthetic_matched = false;
return r;
}
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