plugins/p2p.c

   1 /*
   2  *
   3  *  neard - Near Field Communication manager
   4  *
   5  *  Copyright (C) 2011  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <unistd.h>
  27 #include <stdint.h>
  28 #include <errno.h>
  29 #include <string.h>
  30 #include <sys/socket.h>
  31
  32 #include <linux/socket.h>
  33 #include <linux/nfc.h>
  34
  35 #include <near/plugin.h>
  36 #include <near/log.h>
  37 #include <near/types.h>
  38 #include <near/tag.h>
  39 #include <near/device.h>
  40 #include <near/adapter.h>
  41 #include <near/tlv.h>
  42 #include <near/ndef.h>
  43
  44 #include "p2p.h"
  45
  46 static GSList *driver_list = NULL;
  47 static GList *server_list = NULL;
  48
  49 struct p2p_data {
  50         struct near_p2p_driver *driver;
  51         uint32_t adapter_idx;
  52         uint32_t target_idx;
  53         near_device_io_cb cb;
  54         int fd;
  55         guint watch;
  56
  57         GList *client_list;
  58 };
  59
  60 static gboolean p2p_client_event(GIOChannel *channel, GIOCondition condition,
  61                                                         gpointer user_data)
  62 {
  63         struct p2p_data *client_data = user_data;
  64         near_bool_t more;
  65
  66         DBG("condition 0x%x", condition);
  67
  68         if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
  69                 int err;
  70
  71                 if (client_data->watch > 0)
  72                         g_source_remove(client_data->watch);
  73                 client_data->watch = 0;
  74
  75                 if (condition & (G_IO_NVAL | G_IO_ERR))
  76                         err = -EIO;
  77                 else
  78                         err = 0;
  79
  80                 if (client_data->driver->close != NULL)
  81                         client_data->driver->close(client_data->fd, err);
  82
  83                 near_error("%s client channel closed",
  84                                         client_data->driver->name);
  85
  86                 return FALSE;
  87         }
  88
  89         more = client_data->driver->read(client_data->fd,
  90                                                 client_data->adapter_idx,
  91                                                 client_data->target_idx,
  92                                                 client_data->cb);
  93
  94         if (more == FALSE) {
  95                 if (client_data->driver->close != NULL)
  96                         client_data->driver->close(client_data->fd, 0);
  97                 close(client_data->fd);
  98         }
  99
 100         return more;
 101 }
 102
 103 static void free_client_data(gpointer data)
 104 {
 105         struct p2p_data *client_data;
 106
 107         DBG("");
 108
 109         client_data = (struct p2p_data *)data;
 110
 111         if (client_data->driver->close != NULL)
 112                 client_data->driver->close(client_data->fd, 0);
 113
 114         if (client_data->watch > 0)
 115                 g_source_remove(client_data->watch);
 116
 117         g_free(client_data);
 118 }
 119
 120 static void free_server_data(gpointer data)
 121 {
 122         struct p2p_data *server_data;
 123
 124         DBG("");
 125
 126         server_data = (struct p2p_data *)data;
 127
 128         if (server_data->watch > 0)
 129                 g_source_remove(server_data->watch);
 130         server_data->watch = 0;
 131         g_list_free_full(server_data->client_list, free_client_data);
 132
 133         DBG("Closing server socket");
 134
 135         close(server_data->fd);
 136
 137         g_free(server_data);
 138 }
 139
 140 static gboolean p2p_listener_event(GIOChannel *channel, GIOCondition condition,
 141                                                         gpointer user_data)
 142 {
 143         struct sockaddr_nfc_llcp client_addr;
 144         socklen_t client_addr_len;
 145         int server_fd, client_fd;
 146         struct p2p_data *client_data, *server_data = user_data;
 147         GIOChannel *client_channel;
 148         struct near_p2p_driver *driver = server_data->driver;
 149
 150         DBG("condition 0x%x", condition);
 151
 152         server_fd = g_io_channel_unix_get_fd(channel);
 153
 154         if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 155                 if (server_data->watch > 0)
 156                         g_source_remove(server_data->watch);
 157                 server_data->watch = 0;
 158                 g_list_free_full(server_data->client_list, free_client_data);
 159
 160                 close(server_fd);
 161
 162                 near_error("Error with %s server channel", driver->name);
 163
 164                 return FALSE;
 165         }
 166
 167         client_addr_len = sizeof(client_addr);
 168         client_fd = accept(server_fd, (struct sockaddr *)&client_addr,
 169                                                         &client_addr_len);
 170         if (client_fd < 0) {
 171                 near_error("accept failed %d", client_fd);
 172
 173                 close(server_fd);
 174                 return FALSE;
 175         }
 176
 177         DBG("client dsap %d ssap %d",
 178                 client_addr.dsap, client_addr.ssap);
 179         DBG("target idx %d", client_addr.target_idx);
 180
 181         client_data = g_try_malloc0(sizeof(struct p2p_data));
 182         if (client_data == NULL) {
 183                 close(client_fd);
 184                 return FALSE;
 185         }
 186
 187         client_data->driver = server_data->driver;
 188         client_data->adapter_idx = server_data->adapter_idx;
 189         client_data->target_idx = client_addr.target_idx;
 190         client_data->fd = client_fd;
 191         client_data->cb = server_data->cb;
 192
 193         client_channel = g_io_channel_unix_new(client_fd);
 194         g_io_channel_set_close_on_unref(client_channel, TRUE);
 195
 196         client_data->watch = g_io_add_watch(client_channel,
 197                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 198                                 p2p_client_event,
 199                                 client_data);
 200
 201         server_data->client_list = g_list_append(server_data->client_list, client_data);
 202
 203         return TRUE;
 204 }
 205
 206 static int p2p_bind(struct near_p2p_driver *driver, uint32_t adapter_idx,
 207                                                         near_device_io_cb cb)
 208 {
 209         int err, fd;
 210         struct sockaddr_nfc_llcp addr;
 211         GIOChannel *channel;
 212         struct p2p_data *server_data;
 213
 214         DBG("Binding %s", driver->name);
 215
 216         fd = socket(AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP);
 217         if (fd < 0)
 218                 return -errno;
 219
 220         memset(&addr, 0, sizeof(struct sockaddr_nfc_llcp));
 221         addr.sa_family = AF_NFC;
 222         addr.dev_idx = adapter_idx;
 223         addr.nfc_protocol = NFC_PROTO_NFC_DEP;
 224         addr.service_name_len = strlen(driver->service_name);
 225         strcpy(addr.service_name, driver->service_name);
 226
 227         err = bind(fd, (struct sockaddr *)&addr,
 228                         sizeof(struct sockaddr_nfc_llcp));
 229         if (err < 0) {
 230                 if (errno == EADDRINUSE) {
 231                         DBG("%s is already bound", driver->name);
 232                         return 0;
 233                 }
 234
 235                 near_error("%s bind failed %d %d", driver->name, err, errno);
 236
 237                 close(fd);
 238                 return err;
 239         }
 240
 241         err = listen(fd, 10);
 242         if (err < 0) {
 243                 near_error("%s listen failed %d", driver->name, err);
 244
 245                 close(fd);
 246                 return err;
 247         }
 248
 249         server_data = g_try_malloc0(sizeof(struct p2p_data));
 250         if (server_data == NULL) {
 251                 close(fd);
 252                 return -ENOMEM;
 253         }
 254
 255         server_data->driver = driver;
 256         server_data->adapter_idx = adapter_idx;
 257         server_data->fd = fd;
 258         server_data->cb = cb;
 259
 260         channel = g_io_channel_unix_new(fd);
 261         g_io_channel_set_close_on_unref(channel, TRUE);
 262
 263         server_data->watch = g_io_add_watch(channel,
 264                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 265                                 p2p_listener_event,
 266                                 (gpointer) server_data);
 267
 268         server_list = g_list_append(server_list, server_data);
 269
 270         return 0;
 271 }
 272
 273 static int p2p_listen(uint32_t adapter_idx, near_device_io_cb cb)
 274 {
 275         int err = 0;
 276         GSList *list;
 277
 278         for (list = driver_list; list != NULL; list = list->next) {
 279                 struct near_p2p_driver *driver = list->data;
 280
 281                 err &= p2p_bind(driver, adapter_idx, cb);
 282         }
 283
 284         return err;
 285 }
 286
 287 static int p2p_connect(uint32_t adapter_idx, uint32_t target_idx,
 288                         struct near_ndef_message *ndef,
 289                         near_device_io_cb cb,  struct near_p2p_driver *driver)
 290 {
 291         int fd, err = 0;
 292         struct sockaddr_nfc_llcp addr;
 293
 294         DBG("");
 295
 296         fd = socket(AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP);
 297         if (fd < 0)
 298                 return -errno;
 299
 300         memset(&addr, 0, sizeof(struct sockaddr_nfc_llcp));
 301         addr.sa_family = AF_NFC;
 302         addr.dev_idx = adapter_idx;
 303         addr.target_idx = target_idx;
 304         addr.nfc_protocol = NFC_PROTO_NFC_DEP;
 305         addr.service_name_len = strlen(driver->service_name);
 306         strcpy(addr.service_name, driver->service_name);
 307
 308         err = connect(fd, (struct sockaddr *)&addr,
 309                         sizeof(struct sockaddr_nfc_llcp));
 310         if (err < 0) {
 311                 near_error("Connect failed  %d", err);
 312                 close(fd);
 313
 314                 return err;
 315         }
 316
 317         return fd;
 318 }
 319
 320 static int p2p_push(uint32_t adapter_idx, uint32_t target_idx,
 321                         struct near_ndef_message *ndef, char *service_name,
 322                         near_device_io_cb cb)
 323 {
 324         int fd;
 325         GSList *list;
 326
 327         DBG("");
 328
 329         for (list = driver_list; list != NULL; list = list->next) {
 330                 struct near_p2p_driver *driver = list->data;
 331
 332                 if (strcmp(driver->service_name, service_name) != 0)
 333                         continue;
 334
 335                 fd = p2p_connect(adapter_idx, target_idx, ndef, cb, driver);
 336                 if (fd < 0)
 337                         return fd;
 338
 339                 return driver->push(fd, adapter_idx, target_idx, ndef, cb);
 340         }
 341
 342         return -1;
 343 }
 344
 345 static struct near_device_driver p2p_driver = {
 346         .priority       = NEAR_DEVICE_PRIORITY_HIGH,
 347         .listen         = p2p_listen,
 348         .push           = p2p_push,
 349 };
 350
 351
 352 int near_p2p_register(struct near_p2p_driver *driver)
 353 {
 354         DBG("driver %p name %s", driver, driver->name);
 355
 356         driver_list = g_slist_prepend(driver_list, driver);
 357
 358         return 0;
 359 }
 360
 361 void near_p2p_unregister(struct near_p2p_driver *driver)
 362 {
 363         DBG("driver %p name %s", driver, driver->name);
 364
 365         driver_list = g_slist_remove(driver_list, driver);
 366 }
 367
 368 static int p2p_init(void)
 369 {
 370         DBG("");
 371
 372         npp_init();
 373         snep_init();
 374         handover_init();
 375
 376         return near_device_driver_register(&p2p_driver);
 377 }
 378
 379 static void p2p_exit(void)
 380 {
 381         DBG("");
 382
 383         g_list_free_full(server_list, free_server_data);
 384
 385         snep_exit();
 386         npp_exit();
 387         handover_exit();
 388
 389         near_device_driver_unregister(&p2p_driver);
 390 }
 391
 392 NEAR_PLUGIN_DEFINE(p2p, "NFC Forum peer to peer mode support", VERSION,
 393                 NEAR_PLUGIN_PRIORITY_HIGH, p2p_init, p2p_exit)