tools/usb/usbip/src/usbip_detach.c

// 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;
}