usr.sbin/bthcid/hci.c

   1 /* $NetBSD: hci.c,v 1.2 2007/01/25 20:33:41 plunky Exp $ */
   2 /* $DragonFly: src/usr.sbin/bthcid/hci.c,v 1.2 2008/02/02 09:21:24 swildner Exp $ */
   3
   4 /*-
   5  * Copyright (c) 2006 Itronix Inc.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The name of Itronix Inc. may not be used to endorse
  17  *    or promote products derived from this software without specific
  18  *    prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
  24  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  25  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32 /*
  33  * Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com>
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #include <sys/ioctl.h>
  59 #include <sys/time.h>
  60 #include <bluetooth.h>
  61 #include <errno.h>
  62 #include <event.h>
  63 #include <string.h>
  64 #include <syslog.h>
  65 #include <unistd.h>
  66
  67 #include "bthcid.h"
  68
  69 static struct event     hci_ev;
  70
  71 static void process_hci
  72                 (int, short, void *);
  73
  74 static int process_pin_code_request_event
  75                 (int, struct sockaddr_bt *, bdaddr_t *);
  76 static int process_link_key_request_event
  77                 (int, struct sockaddr_bt *, bdaddr_t *);
  78 static int process_link_key_notification_event
  79                 (int, struct sockaddr_bt *, hci_link_key_notification_ep *);
  80
  81 static int send_link_key_reply
  82                 (int, struct sockaddr_bt *, bdaddr_t *, uint8_t *);
  83 static int send_hci_cmd
  84                 (int, struct sockaddr_bt *, uint16_t, size_t, void *);
  85
  86 static char dev_name[HCI_DEVNAME_SIZE];
  87
  88 /* Initialise HCI Events */
  89 int
  90 init_hci(bdaddr_t *bdaddr)
  91 {
  92         struct sockaddr_bt      sa;
  93         struct hci_filter       filter;
  94         int                     hci;
  95
  96         hci = socket(PF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
  97         if (hci < 0)
  98                 return -1;
  99
 100         memset(&sa, 0, sizeof(sa));
 101         sa.bt_len = sizeof(sa);
 102         sa.bt_family = AF_BLUETOOTH;
 103         bdaddr_copy(&sa.bt_bdaddr, bdaddr);
 104         if (bind(hci, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
 105                 close(hci);
 106                 return -1;
 107         }
 108
 109         memset(&filter, 0, sizeof(filter));
 110         hci_filter_set(HCI_EVENT_PIN_CODE_REQ, &filter);
 111         hci_filter_set(HCI_EVENT_LINK_KEY_REQ, &filter);
 112         hci_filter_set(HCI_EVENT_LINK_KEY_NOTIFICATION, &filter);
 113
 114         if (setsockopt(hci, BTPROTO_HCI, SO_HCI_EVT_FILTER,
 115                         (const void *)&filter, sizeof(filter)) < 0) {
 116                 close(hci);
 117                 return -1;
 118         }
 119
 120         event_set(&hci_ev, hci, EV_READ | EV_PERSIST, process_hci, NULL);
 121         if (event_add(&hci_ev, NULL) < 0) {
 122                 close(hci);
 123                 return -1;
 124         }
 125
 126         return 0;
 127 }
 128
 129 /* Process an HCI event */
 130 static void
 131 process_hci(int sock, short ev, void *arg)
 132 {
 133         char                     buffer[HCI_EVENT_PKT_SIZE];
 134         hci_event_hdr_t         *event = (hci_event_hdr_t *)buffer;
 135         struct sockaddr_bt       addr;
 136         int                      n;
 137         socklen_t                size;
 138
 139         size = sizeof(addr);
 140         n = recvfrom(sock, buffer, sizeof(buffer), 0,
 141                         (struct sockaddr *) &addr, &size);
 142         if (n < 0) {
 143                 syslog(LOG_ERR, "Could not receive from HCI socket: %m");
 144                 return;
 145         }
 146
 147         if (event->type != HCI_EVENT_PKT) {
 148                 syslog(LOG_ERR, "Received unexpected HCI packet, "
 149                                 "type=%#x", event->type);
 150
 151                 return;
 152         }
 153
 154         if (!bt_devname(dev_name, &addr.bt_bdaddr))
 155                 strlcpy(dev_name, "unknown", sizeof(dev_name));
 156
 157         switch (event->event) {
 158         case HCI_EVENT_PIN_CODE_REQ:
 159                 process_pin_code_request_event(sock, &addr,
 160                                             (bdaddr_t *)(event + 1));
 161                 break;
 162
 163         case HCI_EVENT_LINK_KEY_REQ:
 164                 process_link_key_request_event(sock, &addr,
 165                                             (bdaddr_t *)(event + 1));
 166                 break;
 167
 168         case HCI_EVENT_LINK_KEY_NOTIFICATION:
 169                 process_link_key_notification_event(sock, &addr,
 170                         (hci_link_key_notification_ep *)(event + 1));
 171                 break;
 172
 173         default:
 174                 syslog(LOG_ERR, "Received unexpected HCI event, "
 175                                 "event=%#x", event->event);
 176                 break;
 177         }
 178
 179         return;
 180 }
 181
 182 /* Process PIN_Code_Request event */
 183 static int
 184 process_pin_code_request_event(int sock, struct sockaddr_bt *addr,
 185                 bdaddr_t *bdaddr)
 186 {
 187         /* TODO: Add search pin in config file */
 188
 189         uint8_t *pin;
 190         uint8_t *pin2;
 191
 192         syslog(LOG_DEBUG, "Got PIN_Code_Request event from %s, "
 193                           "remote bdaddr %s",
 194                           dev_name,
 195                           bt_ntoa(bdaddr, NULL));
 196
 197         pin = lookup_pin(&addr->bt_bdaddr, bdaddr);
 198         if (pin != NULL)
 199                 return send_pin_code_reply(sock, addr, bdaddr, pin);
 200
 201         pin2 = lookup_pin_conf(&addr->bt_bdaddr, bdaddr);
 202         if (pin2 != NULL) {
 203                 return send_pin_code_reply(sock, addr, bdaddr, pin2);
 204         }
 205
 206         if (send_client_request(&addr->bt_bdaddr, bdaddr, sock) == 0)
 207                 return send_pin_code_reply(sock, addr, bdaddr, NULL);
 208
 209         return 0;
 210 }
 211
 212 /* Process Link_Key_Request event */
 213 static int
 214 process_link_key_request_event(int sock, struct sockaddr_bt *addr,
 215                 bdaddr_t *bdaddr)
 216 {
 217         uint8_t         *key;
 218
 219         syslog(LOG_DEBUG,
 220                 "Got Link_Key_Request event from %s, remote bdaddr %s",
 221                 dev_name, bt_ntoa(bdaddr, NULL));
 222
 223         key = lookup_key(&addr->bt_bdaddr, bdaddr);
 224
 225         if (key != NULL) {
 226                 syslog(LOG_DEBUG, "Found Key, remote bdaddr %s",
 227                                 bt_ntoa(bdaddr, NULL));
 228
 229                 return send_link_key_reply(sock, addr, bdaddr, key);
 230         }
 231
 232         syslog(LOG_DEBUG, "Could not find link key for remote bdaddr %s",
 233                         bt_ntoa(bdaddr, NULL));
 234
 235         return send_link_key_reply(sock, addr, bdaddr, NULL);
 236 }
 237
 238 /* Send PIN_Code_[Negative]_Reply */
 239 int
 240 send_pin_code_reply(int sock, struct sockaddr_bt *addr,
 241         bdaddr_t *bdaddr, uint8_t *pin)
 242 {
 243         int     n;
 244
 245         if (pin != NULL) {
 246                 hci_pin_code_rep_cp      cp;
 247
 248                 syslog(LOG_DEBUG, "Sending PIN_Code_Reply to %s "
 249                                   "for remote bdaddr %s",
 250                                   dev_name,
 251                                   bt_ntoa(bdaddr, NULL));
 252
 253                 bdaddr_copy(&cp.bdaddr, bdaddr);
 254                 memcpy(cp.pin, pin, HCI_PIN_SIZE);
 255
 256                 n = HCI_PIN_SIZE;
 257                 while (n > 0 && pin[n - 1] == 0)
 258                         n--;
 259                 cp.pin_size = n;
 260
 261                 n = send_hci_cmd(sock, addr,
 262                                 HCI_CMD_PIN_CODE_REP, sizeof(cp), &cp);
 263
 264         } else {
 265                 syslog(LOG_DEBUG, "Sending PIN_Code_Negative_Reply to %s "
 266                                   "for remote bdaddr %s",
 267                                   dev_name,
 268                                   bt_ntoa(bdaddr, NULL));
 269
 270                 n = send_hci_cmd(sock, addr, HCI_CMD_PIN_CODE_NEG_REP,
 271                                         sizeof(bdaddr_t), bdaddr);
 272         }
 273
 274         if (n < 0) {
 275                 syslog(LOG_ERR, "Could not send PIN code reply to %s "
 276                                 "for remote bdaddr %s: %m",
 277                                 dev_name,
 278                                 bt_ntoa(bdaddr, NULL));
 279
 280                 return -1;
 281         }
 282
 283         return 0;
 284 }
 285
 286 /* Send Link_Key_[Negative]_Reply */
 287 static int
 288 send_link_key_reply(int sock, struct sockaddr_bt *addr,
 289                 bdaddr_t *bdaddr, uint8_t *key)
 290 {
 291         int     n;
 292
 293         if (key != NULL) {
 294                 hci_link_key_rep_cp     cp;
 295
 296                 bdaddr_copy(&cp.bdaddr, bdaddr);
 297                 memcpy(&cp.key, key, sizeof(cp.key));
 298
 299                 syslog(LOG_DEBUG, "Sending Link_Key_Reply to %s "
 300                                 "for remote bdaddr %s",
 301                                 dev_name, bt_ntoa(bdaddr, NULL));
 302
 303                 n = send_hci_cmd(sock, addr, HCI_CMD_LINK_KEY_REP, sizeof(cp), &cp);
 304         } else {
 305                 hci_link_key_neg_rep_cp cp;
 306
 307                 bdaddr_copy(&cp.bdaddr, bdaddr);
 308
 309                 syslog(LOG_DEBUG, "Sending Link_Key_Negative_Reply to %s "
 310                                 "for remote bdaddr %s",
 311                                 dev_name, bt_ntoa(bdaddr, NULL));
 312
 313                 n = send_hci_cmd(sock, addr, HCI_CMD_LINK_KEY_NEG_REP, sizeof(cp), &cp);
 314         }
 315
 316         if (n < 0) {
 317                 syslog(LOG_ERR, "Could not send link key reply to %s "
 318                                 "for remote bdaddr %s: %m",
 319                                 dev_name, bt_ntoa(bdaddr, NULL));
 320                 return -1;
 321         }
 322
 323         return 0;
 324 }
 325
 326 /* Process Link_Key_Notification event */
 327 static int
 328 process_link_key_notification_event(int sock, struct sockaddr_bt *addr,
 329                 hci_link_key_notification_ep *ep)
 330 {
 331
 332         syslog(LOG_DEBUG, "Got Link_Key_Notification event from %s, "
 333                         "remote bdaddr %s",
 334                         dev_name,
 335                         bt_ntoa(&ep->bdaddr, NULL));
 336
 337         save_key(&addr->bt_bdaddr, &ep->bdaddr, ep->key);
 338         return 0;
 339 }
 340
 341 /* Send HCI Command Packet to socket */
 342 static int
 343 send_hci_cmd(int sock, struct sockaddr_bt *sa, uint16_t opcode, size_t len, void *buf)
 344 {
 345         char msg[HCI_CMD_PKT_SIZE];
 346         hci_cmd_hdr_t *h = (hci_cmd_hdr_t *)msg;
 347
 348         h->type = HCI_CMD_PKT;
 349         h->opcode = htole16(opcode);
 350         h->length = len;
 351
 352         if (len > 0)
 353                 memcpy(msg + sizeof(hci_cmd_hdr_t), buf, len);
 354
 355         return sendto(sock, msg, sizeof(hci_cmd_hdr_t) + len, 0,
 356                         (struct sockaddr *)sa, sizeof(*sa));
 357 }