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// SPDX-License-Identifier: Apache-2.0
// Copyright (C) 2018 IBM Corp.
#include "config.h"
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <systemd/sd-bus.h>
#include "common.h"
#include "dbus.h"
#include "mboxd.h"
#include "protocol.h"
#include "transport.h"
static int transport_dbus_property_update(struct mbox_context *context,
uint8_t events)
{
/* Two properties plus a terminating NULL */
char *props[3] = { 0 };
int i = 0;
if (events & BMC_EVENT_FLASH_CTRL_LOST) {
props[i++] = "FlashControlLost";
}
if (events & BMC_EVENT_DAEMON_READY) {
props[i++] = "DaemonReady";
}
return sd_bus_emit_properties_changed_strv(context->bus,
MBOX_DBUS_OBJECT,
/* FIXME: Hard-coding v2 */
MBOX_DBUS_PROTOCOL_IFACE_V2,
props);
}
static int transport_dbus_set_events(struct mbox_context *context,
uint8_t events)
{
int rc;
rc = transport_dbus_property_update(context, events);
if (rc < 0) {
return rc;
}
/*
* Handle signals - edge triggered, only necessary when they're
* asserted
*/
if (events & BMC_EVENT_WINDOW_RESET) {
sd_bus_message *m = NULL;
rc = sd_bus_message_new_signal(context->bus, &m,
MBOX_DBUS_OBJECT,
/* FIXME: Hard-coding v2 */
MBOX_DBUS_PROTOCOL_IFACE_V2,
"WindowReset");
if (rc < 0) {
return rc;
}
rc = sd_bus_send(context->bus, m, NULL);
if (rc < 0) {
return rc;
}
}
if (events & BMC_EVENT_REBOOT) {
sd_bus_message *m = NULL;
rc = sd_bus_message_new_signal(context->bus, &m,
MBOX_DBUS_OBJECT,
/* FIXME: Hard-coding v2 */
MBOX_DBUS_PROTOCOL_IFACE_V2,
"ProtocolReset");
if (rc < 0) {
return rc;
}
rc = sd_bus_send(context->bus, m, NULL);
if (rc < 0) {
return rc;
}
}
return 0;
}
static int transport_dbus_clear_events(struct mbox_context *context,
uint8_t events)
{
/* No need to emit signals for ackable events on clear */
return transport_dbus_property_update(context, events);
}
static const struct transport_ops transport_dbus_ops = {
.set_events = transport_dbus_set_events,
.clear_events = transport_dbus_clear_events,
};
static int transport_dbus_reset(sd_bus_message *m, void *userdata,
sd_bus_error *ret_error)
{
struct mbox_context *context = userdata;
sd_bus_message *n;
int rc;
if (!context) {
MSG_ERR("DBUS Internal Error\n");
return -EINVAL;
}
rc = context->protocol->reset(context);
if (rc < 0) {
return rc;
}
rc = sd_bus_message_new_method_return(m, &n);
if (rc < 0) {
MSG_ERR("sd_bus_message_new_method_return failed: %d\n", rc);
return rc;
}
return sd_bus_send(NULL, n, NULL);
}
static int transport_dbus_get_info(sd_bus_message *m, void *userdata,
sd_bus_error *ret_error)
{
struct mbox_context *context = userdata;
struct protocol_get_info io;
sd_bus_message *n;
int rc;
if (!context) {
MSG_ERR("DBUS Internal Error\n");
return -EINVAL;
}
rc = sd_bus_message_read_basic(m, 'y', &io.req.api_version);
if (rc < 0) {
MSG_ERR("DBUS error reading message: %s\n", strerror(-rc));
return rc;
}
rc = context->protocol->get_info(context, &io);
if (rc < 0) {
return rc;
}
/* Switch transport to DBus. This is fine as DBus signals are async */
context->transport = &transport_dbus_ops;
/* A bit messy, but we need the correct event mask */
protocol_events_set(context, context->bmc_events);
rc = sd_bus_message_new_method_return(m, &n);
if (rc < 0) {
MSG_ERR("sd_bus_message_new_method_return failed: %d\n", rc);
return rc;
}
if (API_VERSION_2 != io.resp.api_version) {
MSG_ERR("Unsupported protocol version for DBus transport: %d\n",
io.resp.api_version);
return rc;
}
rc = sd_bus_message_append(n, "yyq",
io.resp.api_version,
io.resp.v2.block_size_shift,
io.resp.v2.timeout);
if (rc < 0) {
MSG_ERR("sd_bus_message_append failed!\n");
return rc;
}
return sd_bus_send(NULL, n, NULL);
}
static int transport_dbus_ack(sd_bus_message *m, void *userdata,
sd_bus_error *ret_error)
{
struct mbox_context *context = userdata;
struct protocol_ack io;
sd_bus_message *n;
int rc;
if (!context) {
MSG_ERR("DBUS Internal Error\n");
return -EINVAL;
}
rc = sd_bus_message_read_basic(m, 'y', &io.req.flags);
if (rc < 0) {
MSG_ERR("DBUS error reading message: %s\n", strerror(-rc));
return rc;
}
rc = context->protocol->ack(context, &io);
if (rc < 0) {
return rc;
}
rc = sd_bus_message_new_method_return(m, &n);
if (rc < 0) {
MSG_ERR("sd_bus_message_new_method_return failed: %d\n", rc);
return rc;
}
return sd_bus_send(NULL, n, NULL);
}
static int transport_dbus_get_property(sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *ret_error)
{
struct mbox_context *context = userdata;
bool value;
assert(!strcmp(MBOX_DBUS_OBJECT, path));
assert(!strcmp(MBOX_DBUS_PROTOCOL_IFACE_V2, interface));
if (!strcmp("FlashControlLost", property)) {
value = context->bmc_events & BMC_EVENT_FLASH_CTRL_LOST;
} else if (!strcmp("DaemonReady", property)) {
value = context->bmc_events & BMC_EVENT_DAEMON_READY;
} else {
MSG_ERR("Unknown DBus property: %s\n", property);
return -EINVAL;
}
return sd_bus_message_append(reply, "b", value);
}
static const sd_bus_vtable protocol_unversioned_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_METHOD("Reset", NULL, NULL, &transport_dbus_reset,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetInfo", "y", "yyq", &transport_dbus_get_info,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("Ack", "y", NULL, &transport_dbus_ack,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_VTABLE_END
};
static const sd_bus_vtable protocol_v2_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_METHOD("Reset", NULL, NULL, &transport_dbus_reset,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetInfo", "y", "yyq", &transport_dbus_get_info,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("Ack", "y", NULL, &transport_dbus_ack,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_PROPERTY("FlashControlLost", "b", transport_dbus_get_property,
0, /* Just a pointer to struct mbox_context */
SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("DaemonReady", "b", transport_dbus_get_property,
0, /* Just a pointer to struct mbox_context */
SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_SIGNAL("ProtocolReset", NULL, 0),
SD_BUS_SIGNAL("WindowReset", NULL, 0),
SD_BUS_VTABLE_END
};
int transport_dbus_init(struct mbox_context *context)
{
int rc;
rc = sd_bus_add_object_vtable(context->bus, NULL,
MBOX_DBUS_OBJECT,
MBOX_DBUS_PROTOCOL_IFACE,
protocol_unversioned_vtable,
context);
if (rc < 0) {
return rc;
}
rc = sd_bus_add_object_vtable(context->bus, NULL,
MBOX_DBUS_OBJECT,
MBOX_DBUS_PROTOCOL_IFACE_V2,
protocol_v2_vtable, context);
return rc;
}
#define __unused __attribute__((unused))
void transport_dbus_free(struct mbox_context *context __unused)
{
return;
}
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