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/*
* Mailbox Daemon DBUS Helpers
*
* Copyright 2016 IBM
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#define _GNU_SOURCE
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <limits.h>
#include <poll.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/timerfd.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <inttypes.h>
#include <systemd/sd-bus.h>
#include "mbox.h"
#include "common.h"
#include "dbus.h"
#include "mboxd_dbus.h"
#include "mboxd_windows.h"
#include "mboxd_msg.h"
#include "mboxd_lpc.h"
#include "mboxd_flash.h"
typedef int (*mboxd_dbus_handler)(struct mbox_context *, struct mbox_dbus_msg *,
struct mbox_dbus_msg *);
/* DBUS Functions */
/*
* Command: DBUS Ping
* Ping the daemon
*
* Args: NONE
* Resp: NONE
*/
static int dbus_handle_ping(struct mbox_context *context,
struct mbox_dbus_msg *req,
struct mbox_dbus_msg *resp)
{
return 0;
}
/*
* Command: DBUS Status
* Get the status of the daemon
*
* Args: NONE
* Resp[0]: Status Code
*/
static int dbus_handle_daemon_state(struct mbox_context *context,
struct mbox_dbus_msg *req,
struct mbox_dbus_msg *resp)
{
resp->num_args = DAEMON_STATE_NUM_ARGS;
resp->args = calloc(resp->num_args, sizeof(*resp->args));
resp->args[0] = (context->state & STATE_SUSPENDED) ?
DAEMON_STATE_SUSPENDED : DAEMON_STATE_ACTIVE;
return 0;
}
/*
* Command: DBUS LPC State
* Get the state of the lpc bus mapping (whether it points to memory or flash
*
* Args: NONE
* Resp[0]: LPC Bus State Code
*/
static int dbus_handle_lpc_state(struct mbox_context *context,
struct mbox_dbus_msg *req,
struct mbox_dbus_msg *resp)
{
resp->num_args = LPC_STATE_NUM_ARGS;
resp->args = calloc(resp->num_args, sizeof(*resp->args));
if ((context->state & MAPS_MEM) && !(context->state & MAPS_FLASH)) {
resp->args[0] = LPC_STATE_MEM;
} else if (!(context->state & MAPS_MEM) &&
(context->state & MAPS_FLASH)) {
resp->args[0] = LPC_STATE_FLASH;
} else {
resp->args[0] = LPC_STATE_INVALID;
}
return 0;
}
/*
* Command: DBUS Reset
* Reset the daemon state, final operation TBA.
* For now we just point the lpc mapping back at the flash.
*
* Args: NONE
* Resp: NONE
*/
static int dbus_handle_reset(struct mbox_context *context,
struct mbox_dbus_msg *req,
struct mbox_dbus_msg *resp)
{
int rc;
/* We don't let the host access flash if the daemon is suspened */
if (context->state & STATE_SUSPENDED) {
return -E_DBUS_REJECTED;
}
/*
* This will close (and flush) the current window and reset the lpc bus
* mapping back to flash, or memory in case we're using a virtual pnor.
* Better set the bmc event to notify the host of this.
*/
reset_all_windows(context, SET_BMC_EVENT);
rc = reset_lpc(context);
if (rc < 0) {
return -E_DBUS_HARDWARE;
}
return 0;
}
/*
* Command: DBUS Kill
* Stop the daemon
*
* Args: NONE
* Resp: NONE
*/
static int dbus_handle_kill(struct mbox_context *context,
struct mbox_dbus_msg *req,
struct mbox_dbus_msg *resp)
{
context->terminate = 1;
MSG_INFO("DBUS Kill - Exiting...\n");
return 0;
}
/*
* Command: DBUS Flash Modified
* Used to notify the daemon that the flash has been modified out from under
* it - We need to reset all out windows to ensure flash will be reloaded
* when a new window is opened.
* Note: We don't flush any previously opened windows
*
* Args: NONE
* Resp: NONE
*/
static int dbus_handle_modified(struct mbox_context *context,
struct mbox_dbus_msg *req,
struct mbox_dbus_msg *resp)
{
/* Flash has been modified - can no longer trust our erased bytemap */
set_flash_bytemap(context, 0, context->flash_size, FLASH_DIRTY);
/* Force daemon to reload all windows -> Set BMC event to notify host */
reset_all_windows(context, SET_BMC_EVENT);
return 0;
}
/*
* Command: DBUS Suspend
* Suspend the daemon to inhibit it from performing flash accesses.
* This is used to synchronise access to the flash between the daemon and
* directly from the BMC.
*
* Args: NONE
* Resp: NONE
*/
static int dbus_handle_suspend(struct mbox_context *context,
struct mbox_dbus_msg *req,
struct mbox_dbus_msg *resp)
{
int rc;
if (context->state & STATE_SUSPENDED) {
/* Already Suspended */
return DBUS_SUCCESS;
}
/* Nothing to check - Just set the bit to notify the host */
rc = set_bmc_events(context, BMC_EVENT_FLASH_CTRL_LOST, SET_BMC_EVENT);
if (rc < 0) {
return -E_DBUS_HARDWARE;
}
context->state |= STATE_SUSPENDED;
return rc;
}
/*
* Command: DBUS Resume
* Resume the daemon to let it perform flash accesses again.
*
* Args[0]: Flash Modified (0 - no | 1 - yes)
* Resp: NONE
*/
static int dbus_handle_resume(struct mbox_context *context,
struct mbox_dbus_msg *req,
struct mbox_dbus_msg *resp)
{
int rc;
if (req->num_args != 1) {
return -E_DBUS_INVAL;
}
if (!(context->state & STATE_SUSPENDED)) {
/* We weren't suspended... */
return DBUS_SUCCESS;
}
if (req->args[0] == RESUME_FLASH_MODIFIED) {
/* Clear the bit and call the flash modified handler */
clr_bmc_events(context, BMC_EVENT_FLASH_CTRL_LOST,
NO_BMC_EVENT);
rc = dbus_handle_modified(context, req, resp);
} else {
/* Flash wasn't modified - just clear the bit with writeback */
rc = clr_bmc_events(context, BMC_EVENT_FLASH_CTRL_LOST,
SET_BMC_EVENT);
}
if (rc < 0) {
rc = -E_DBUS_HARDWARE;
}
context->state &= ~STATE_SUSPENDED;
return rc;
}
static const mboxd_dbus_handler dbus_handlers[NUM_DBUS_CMDS] = {
dbus_handle_ping,
dbus_handle_daemon_state,
dbus_handle_reset,
dbus_handle_suspend,
dbus_handle_resume,
dbus_handle_modified,
dbus_handle_kill,
dbus_handle_lpc_state
};
static int method_cmd(sd_bus_message *m, void *userdata,
sd_bus_error *ret_error)
{
struct mbox_dbus_msg req = { 0 }, resp = { 0 };
struct mbox_context *context;
sd_bus_message *n;
int rc, i;
context = (struct mbox_context *) userdata;
if (!context) {
MSG_ERR("DBUS Internal Error\n");
rc = -E_DBUS_INTERNAL;
goto out;
}
/* Read the command */
rc = sd_bus_message_read(m, "y", &req.cmd);
if (rc < 0) {
MSG_ERR("DBUS error reading message: %s\n", strerror(-rc));
rc = -E_DBUS_INTERNAL;
goto out;
}
MSG_DBG("DBUS request: %u\n", req.cmd);
/* Read the args */
rc = sd_bus_message_read_array(m, 'y', (const void **) &req.args,
&req.num_args);
if (rc < 0) {
MSG_ERR("DBUS error reading message: %s\n", strerror(-rc));
rc = -E_DBUS_INTERNAL;
goto out;
}
MSG_DBG("DBUS num_args: %u\n", (unsigned) req.num_args);
for (i = 0; i < req.num_args; i++) {
MSG_DBG("DBUS arg[%d]: %u\n", i, req.args[i]);
}
/* Handle the command */
if (req.cmd >= NUM_DBUS_CMDS) {
rc = -E_DBUS_INVAL;
MSG_ERR("Received unknown dbus cmd: %d\n", req.cmd);
} else {
rc = dbus_handlers[req.cmd](context, &req, &resp);
}
out:
if (rc < 0) {
resp.cmd = -rc;
}
rc = sd_bus_message_new_method_return(m, &n); /* Generate response */
if (rc < 0) {
MSG_ERR("sd_bus_message_new_method_return failed: %d\n", rc);
goto cleanup;
}
rc = sd_bus_message_append(n, "y", resp.cmd); /* Set return code */
if (rc < 0) {
MSG_ERR("sd_bus_message_append failed: %d\n", rc);
goto cleanup;
}
rc = sd_bus_message_append_array(n, 'y', resp.args, resp.num_args);
if (rc < 0) {
MSG_ERR("sd_bus_message_append_array failed: %d\n", rc);
goto cleanup;
}
MSG_DBG("DBUS response: %u\n", resp.cmd);
MSG_DBG("DBUS num_args: %u\n", (unsigned) resp.num_args);
for (i = 0; i < resp.num_args; i++) {
MSG_DBG("DBUS arg[%d]: %u\n", i, resp.args[i]);
}
rc = sd_bus_send(NULL, n, NULL); /* Send response */
if (rc < 0)
MSG_ERR("sd_bus_send failed: %d\n", rc);
cleanup:
free(resp.args);
return rc;
}
static const sd_bus_vtable mboxd_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_METHOD("cmd", "yay", "yay", &method_cmd,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_VTABLE_END
};
int init_mboxd_dbus(struct mbox_context *context)
{
int rc;
rc = sd_bus_default_system(&context->bus);
if (rc < 0) {
MSG_ERR("Failed to connect to the system bus: %s\n",
strerror(-rc));
return rc;
}
rc = sd_bus_add_object_vtable(context->bus, NULL, DOBJ_NAME, DBUS_NAME,
mboxd_vtable, context);
if (rc < 0) {
MSG_ERR("Failed to register vtable: %s\n", strerror(-rc));
return rc;
}
rc = sd_bus_request_name(context->bus, DBUS_NAME,
SD_BUS_NAME_ALLOW_REPLACEMENT |
SD_BUS_NAME_REPLACE_EXISTING);
if (rc < 0) {
MSG_ERR("Failed to acquire service name: %s\n", strerror(-rc));
return rc;
}
rc = sd_bus_get_fd(context->bus);
if (rc < 0) {
MSG_ERR("Failed to get bus fd: %s\n", strerror(-rc));
return rc;
}
context->fds[DBUS_FD].fd = rc;
return 0;
}
void free_mboxd_dbus(struct mbox_context *context)
{
sd_bus_unref(context->bus);
}