vold/cmd_dispatch.c

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * 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.
 */

#include <unistd.h>
#include <errno.h>

#include "vold.h"
#include "cmd_dispatch.h"
#include "ums.h"
#include "volmgr.h"

struct cmd_dispatch {
    char *cmd;
    int (* dispatch) (char *);
};

static void dispatch_cmd(char *cmd);
static int do_send_ums_status(char *cmd);
static int do_set_ums_enable(char *cmd);
static int do_mount_volume(char *cmd);
static int do_eject_media(char *cmd);
static int do_format_media(char *cmd);

static struct cmd_dispatch dispatch_table[] = {
    { VOLD_CMD_ENABLE_UMS,      do_set_ums_enable },
    { VOLD_CMD_DISABLE_UMS,     do_set_ums_enable },
    { VOLD_CMD_SEND_UMS_STATUS, do_send_ums_status },
    { VOLD_CMD_MOUNT_VOLUME,    do_mount_volume },
    { VOLD_CMD_EJECT_MEDIA,     do_eject_media },
    { VOLD_CMD_FORMAT_MEDIA,    do_format_media },
    { NULL, NULL }
};

int process_framework_command(int socket)
{
    int rc;
    char buffer[101];

    if ((rc = read(socket, buffer, sizeof(buffer) -1)) < 0) {
        LOGE("Unable to read framework command (%s)", strerror(errno));
        return -errno;
    } else if (!rc)
        return -ECONNRESET;

    int start = 0;
    int i;

    buffer[rc] = 0;

    for (i = 0; i < rc; i++) {
        if (buffer[i] == 0) {
            dispatch_cmd(buffer + start);
            start = i + 1;
        }
    }
    return 0;
}

static void dispatch_cmd(char *cmd)
{
    struct cmd_dispatch *c;

    LOG_VOL("dispatch_cmd(%s):", cmd);

    for (c = dispatch_table; c->cmd != NULL; c++) {
        if (!strncmp(c->cmd, cmd, strlen(c->cmd))) {
            c->dispatch(cmd);
            return;
        }
    }

    LOGE("No cmd handlers defined for '%s'", cmd);
}

static int do_send_ums_status(char *cmd)
{
    return ums_send_status();
}

static int do_set_ums_enable(char *cmd)
{
    if (!strcmp(cmd, VOLD_CMD_ENABLE_UMS))
        return volmgr_enable_ums(true);

    return volmgr_enable_ums(false);
}

static int do_mount_volume(char *cmd)
{
    return volmgr_start_volume_by_mountpoint(&cmd[strlen("mount_volume:")]);
}

static int do_format_media(char *cmd)
{
    return volmgr_format_volume(&cmd[strlen("format_media:")]);
}

static int do_eject_media(char *cmd)
{
    return volmgr_stop_volume_by_mountpoint(&cmd[strlen("eject_media:")]);
}