tools/usb/usbip/src/usbip_detach.c

   1 /*
   2  * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
   3  *               2005-2007 Takahiro Hirofuchi
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <ctype.h>
  20 #include <limits.h>
  21 #include <stdint.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include <getopt.h>
  27 #include <unistd.h>
  28
  29 #include "vhci_driver.h"
  30 #include "usbip_common.h"
  31 #include "usbip_network.h"
  32 #include "usbip.h"
  33
  34 static const char usbip_detach_usage_string[] =
  35         "usbip detach <args>\n"
  36         "    -p, --port=<port>    " USBIP_VHCI_DRV_NAME
  37         " port the device is on\n";
  38
  39 void usbip_detach_usage(void)
  40 {
  41         printf("usage: %s", usbip_detach_usage_string);
  42 }
  43
  44 static int detach_port(char *port)
  45 {
  46         int ret;
  47         uint8_t portnum;
  48         char path[PATH_MAX+1];
  49
  50         for (unsigned int i = 0; i < strlen(port); i++)
  51                 if (!isdigit(port[i])) {
  52                         err("invalid port %s", port);
  53                         return -1;
  54                 }
  55
  56         /* check max port */
  57
  58         portnum = atoi(port);
  59
  60         /* remove the port state file */
  61
  62         snprintf(path, PATH_MAX, VHCI_STATE_PATH"/port%d", portnum);
  63
  64         remove(path);
  65         rmdir(VHCI_STATE_PATH);
  66
  67         ret = usbip_vhci_driver_open();
  68         if (ret < 0) {
  69                 err("open vhci_driver");
  70                 return -1;
  71         }
  72
  73         ret = usbip_vhci_detach_device(portnum);
  74         if (ret < 0)
  75                 return -1;
  76
  77         usbip_vhci_driver_close();
  78
  79         return ret;
  80 }
  81
  82 int usbip_detach(int argc, char *argv[])
  83 {
  84         static const struct option opts[] = {
  85                 { "port", required_argument, NULL, 'p' },
  86                 { NULL, 0, NULL, 0 }
  87         };
  88         int opt;
  89         int ret = -1;
  90
  91         for (;;) {
  92                 opt = getopt_long(argc, argv, "p:", opts, NULL);
  93
  94                 if (opt == -1)
  95                         break;
  96
  97                 switch (opt) {
  98                 case 'p':
  99                         ret = detach_port(optarg);
 100                         goto out;
 101                 default:
 102                         goto err_out;
 103                 }
 104         }
 105
 106 err_out:
 107         usbip_detach_usage();
 108 out:
 109         return ret;
 110 }