// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
 *               2005-2007 Takahiro Hirofuchi
 */

#include <ctype.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <getopt.h>
#include <unistd.h>

#include "vhci_driver.h"
#include "usbip_common.h"
#include "usbip_network.h"
#include "usbip.h"

static const char usbip_detach_usage_string[] =
        "usbip detach <args>\n"
        "    -p, --port=<port>    " USBIP_VHCI_DRV_NAME
        " port the device is on\n";

void usbip_detach_usage(void)
{
        printf("usage: %s", usbip_detach_usage_string);
}

static int detach_port(char *port)
{
        int ret = 0;
        uint8_t portnum;
        char path[PATH_MAX+1];
        int i;
        struct usbip_imported_device *idev;
        int found = 0;

        unsigned int port_len = strlen(port);

        for (unsigned int i = 0; i < port_len; i++)
                if (!isdigit(port[i])) {
                        err("invalid port %s", port);
                        return -1;
                }

        portnum = atoi(port);

        ret = usbip_vhci_driver_open();
        if (ret < 0) {
                err("open vhci_driver (is vhci_hcd loaded?)");
                return -1;
        }

        /* check for invalid port */
        for (i = 0; i < vhci_driver->nports; i++) {
                idev = &vhci_driver->idev[i];

                if (idev->port == portnum) {
                        found = 1;
                        if (idev->status != VDEV_ST_NULL)
                                break;
                        info("Port %d is already detached!\n", idev->port);
                        goto call_driver_close;
                }
        }

        if (!found) {
                ret = -1;
                err("Invalid port %s > maxports %d",
                        port, vhci_driver->nports);
                goto call_driver_close;
        }

        /* remove the port state file */
        snprintf(path, PATH_MAX, VHCI_STATE_PATH"/port%d", portnum);

        remove(path);
        rmdir(VHCI_STATE_PATH);

        ret = usbip_vhci_detach_device(portnum);
        if (ret < 0) {
                ret = -1;
                err("Port %d detach request failed!\n", portnum);
                goto call_driver_close;
        }
        info("Port %d is now detached!\n", portnum);

call_driver_close:
        usbip_vhci_driver_close();

        return ret;
}

int usbip_detach(int argc, char *argv[])
{
        static const struct option opts[] = {
                { "port", required_argument, NULL, 'p' },
                { NULL, 0, NULL, 0 }
        };
        int opt;
        int ret = -1;

        for (;;) {
                opt = getopt_long(argc, argv, "p:", opts, NULL);

                if (opt == -1)
                        break;

                switch (opt) {
                case 'p':
                        ret = detach_port(optarg);
                        goto out;
                default:
                        goto err_out;
                }
        }

err_out:
        usbip_detach_usage();
out:
        return ret;
}