tools/usb/usbip/src/usbip_detach.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
   4  *               2005-2007 Takahiro Hirofuchi
   5  */
   6
   7 #include <ctype.h>
   8 #include <limits.h>
   9 #include <stdint.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13
  14 #include <getopt.h>
  15 #include <unistd.h>
  16
  17 #include "vhci_driver.h"
  18 #include "usbip_common.h"
  19 #include "usbip_network.h"
  20 #include "usbip.h"
  21
  22 static const char usbip_detach_usage_string[] =
  23         "usbip detach <args>\n"
  24         "    -p, --port=<port>    " USBIP_VHCI_DRV_NAME
  25         " port the device is on\n";
  26
  27 void usbip_detach_usage(void)
  28 {
  29         printf("usage: %s", usbip_detach_usage_string);
  30 }
  31
  32 static int detach_port(char *port)
  33 {
  34         int ret = 0;
  35         uint8_t portnum;
  36         char path[PATH_MAX+1];
  37         int i;
  38         struct usbip_imported_device *idev;
  39         int found = 0;
  40
  41         unsigned int port_len = strlen(port);
  42
  43         for (unsigned int i = 0; i < port_len; i++)
  44                 if (!isdigit(port[i])) {
  45                         err("invalid port %s", port);
  46                         return -1;
  47                 }
  48
  49         portnum = atoi(port);
  50
  51         ret = usbip_vhci_driver_open();
  52         if (ret < 0) {
  53                 err("open vhci_driver");
  54                 return -1;
  55         }
  56
  57         /* check for invalid port */
  58         for (i = 0; i < vhci_driver->nports; i++) {
  59                 idev = &vhci_driver->idev[i];
  60
  61                 if (idev->port == portnum) {
  62                         found = 1;
  63                         if (idev->status != VDEV_ST_NULL)
  64                                 break;
  65                         info("Port %d is already detached!\n", idev->port);
  66                         goto call_driver_close;
  67                 }
  68         }
  69
  70         if (!found) {
  71                 err("Invalid port %s > maxports %d",
  72                         port, vhci_driver->nports);
  73                 goto call_driver_close;
  74         }
  75
  76         /* remove the port state file */
  77         snprintf(path, PATH_MAX, VHCI_STATE_PATH"/port%d", portnum);
  78
  79         remove(path);
  80         rmdir(VHCI_STATE_PATH);
  81
  82         ret = usbip_vhci_detach_device(portnum);
  83         if (ret < 0) {
  84                 ret = -1;
  85                 err("Port %d detach request failed!\n", portnum);
  86                 goto call_driver_close;
  87         }
  88         info("Port %d is now detached!\n", portnum);
  89
  90 call_driver_close:
  91         usbip_vhci_driver_close();
  92
  93         return ret;
  94 }
  95
  96 int usbip_detach(int argc, char *argv[])
  97 {
  98         static const struct option opts[] = {
  99                 { "port", required_argument, NULL, 'p' },
 100                 { NULL, 0, NULL, 0 }
 101         };
 102         int opt;
 103         int ret = -1;
 104
 105         for (;;) {
 106                 opt = getopt_long(argc, argv, "p:", opts, NULL);
 107
 108                 if (opt == -1)
 109                         break;
 110
 111                 switch (opt) {
 112                 case 'p':
 113                         ret = detach_port(optarg);
 114                         goto out;
 115                 default:
 116                         goto err_out;
 117                 }
 118         }
 119
 120 err_out:
 121         usbip_detach_usage();
 122 out:
 123         return ret;
 124 }