etc/afpd/afp_avahi.c

   1 /*
   2  * Author:  Daniel S. Haischt <me@daniel.stefan.haischt.name>
   3  * Purpose: Avahi based Zeroconf support
   4  * Docs:    http://avahi.org/download/doxygen/
   5  *
   6  */
   7
   8 #ifdef HAVE_CONFIG_H
   9 #include <config.h>
  10 #endif
  11
  12 #ifdef HAVE_AVAHI
  13
  14 #include <unistd.h>
  15 #include <time.h>
  16
  17 #include <avahi-common/strlst.h>
  18
  19 #include <atalk/logger.h>
  20 #include <atalk/util.h>
  21 #include <atalk/dsi.h>
  22 #include <atalk/unicode.h>
  23
  24 #include "afp_avahi.h"
  25 #include "afp_config.h"
  26 #include "volume.h"
  27
  28 /*****************************************************************
  29  * Global variables
  30  *****************************************************************/
  31 struct context *ctx = NULL;
  32
  33 /*****************************************************************
  34  * Private functions
  35  *****************************************************************/
  36
  37 static void publish_reply(AvahiEntryGroup *g,
  38                           AvahiEntryGroupState state,
  39                           void *userdata);
  40
  41 /*
  42  * This function tries to register the AFP DNS
  43  * SRV service type.
  44  */
  45 static void register_stuff(void) {
  46     uint port;
  47     const AFPObj *obj;
  48     const struct vol *volume;
  49     DSI *dsi;
  50     char name[MAXINSTANCENAMELEN+1];
  51     AvahiStringList *strlist = NULL;
  52     AvahiStringList *strlist2 = NULL;
  53     char tmpname[256];
  54
  55     assert(ctx->client);
  56
  57     if (!ctx->group) {
  58         if (!(ctx->group = avahi_entry_group_new(ctx->client, publish_reply, ctx))) {
  59             LOG(log_error, logtype_afpd, "Failed to create entry group: %s",
  60                 avahi_strerror(avahi_client_errno(ctx->client)));
  61             goto fail;
  62         }
  63     }
  64
  65     if (avahi_entry_group_is_empty(ctx->group)) {
  66         /* Register our service */
  67
  68         /* Build AFP volumes list */
  69         int i = 0;
  70         strlist = avahi_string_list_add_printf(strlist, "sys=waMa=0,adVF=0x100");
  71
  72         for (volume = getvolumes(); volume; volume = volume->v_next) {
  73
  74             if (convert_string(CH_UCS2, CH_UTF8_MAC, volume->v_name, -1, tmpname, 255) <= 0) {
  75                 LOG ( log_error, logtype_afpd, "Could not set Zeroconf volume name for TimeMachine");
  76                 goto fail;
  77             }
  78
  79             if (volume->v_flags & AFPVOL_TM) {
  80                 if (volume->v_uuid) {
  81                     LOG(log_info, logtype_afpd, "Registering volume '%s' with UUID: '%s' for TimeMachine",
  82                         volume->v_localname, volume->v_uuid);
  83                     strlist = avahi_string_list_add_printf(strlist, "dk%u=adVN=%s,adVF=0xa1,adVU=%s",
  84                                                            i++, tmpname, volume->v_uuid);
  85                 } else {
  86                     LOG(log_warning, logtype_afpd, "Registering volume '%s' for TimeMachine. But UUID is invalid.",
  87                         volume->v_localname);
  88                     strlist = avahi_string_list_add_printf(strlist, "dk%u=adVN=%s,adVF=0xa1",
  89                                                            i++, tmpname);
  90                 }
  91             }
  92         }
  93
  94         /* AFP server */
  95         for (dsi = obj->dsi; dsi; dsi = dsi->next) {
  96             port = getip_port((struct sockaddr *)&dsi->server);
  97
  98             if (convert_string(obj->options.unixcharset,
  99                                CH_UTF8,
 100                                obj->options.hostname,
 101                                -1,
 102                                name,
 103                                MAXINSTANCENAMELEN) <= 0) {
 104                 LOG(log_error, logtype_afpd, "Could not set Zeroconf instance name");
 105                 goto fail;
 106             }
 107             if ((dsi->bonjourname = strdup(name)) == NULL) {
 108                 LOG(log_error, logtype_afpd, "Could not set Zeroconf instance name");
 109                 goto fail;
 110
 111             }
 112             LOG(log_info, logtype_afpd, "Registering server '%s' with Bonjour",
 113                 dsi->bonjourname);
 114
 115             if (avahi_entry_group_add_service(ctx->group,
 116                                               AVAHI_IF_UNSPEC,
 117                                               AVAHI_PROTO_UNSPEC,
 118                                               0,
 119                                               dsi->bonjourname,
 120                                               AFP_DNS_SERVICE_TYPE,
 121                                               NULL,
 122                                               NULL,
 123                                               port,
 124                                               NULL) < 0) {
 125                 LOG(log_error, logtype_afpd, "Failed to add service: %s",
 126                     avahi_strerror(avahi_client_errno(ctx->client)));
 127                 goto fail;
 128             }
 129
 130             if (i && avahi_entry_group_add_service_strlst(ctx->group,
 131                                                           AVAHI_IF_UNSPEC,
 132                                                           AVAHI_PROTO_UNSPEC,
 133                                                           0,
 134                                                           dsi->bonjourname,
 135                                                           ADISK_SERVICE_TYPE,
 136                                                           NULL,
 137                                                           NULL,
 138                                                           9, /* discard */
 139                                                           strlist) < 0) {
 140                 LOG(log_error, logtype_afpd, "Failed to add service: %s",
 141                     avahi_strerror(avahi_client_errno(ctx->client)));
 142                 goto fail;
 143             }   /* if */
 144
 145             if (obj->options.mimicmodel) {
 146                 strlist2 = avahi_string_list_add_printf(strlist2, "model=%s", obj->options.mimicmodel);
 147                 if (avahi_entry_group_add_service_strlst(ctx->group,
 148                                                          AVAHI_IF_UNSPEC,
 149                                                          AVAHI_PROTO_UNSPEC,
 150                                                          0,
 151                                                          dsi->bonjourname,
 152                                                          DEV_INFO_SERVICE_TYPE,
 153                                                          NULL,
 154                                                          NULL,
 155                                                          0,
 156                                                          strlist2) < 0) {
 157                     LOG(log_error, logtype_afpd, "Failed to add service: %s",
 158                         avahi_strerror(avahi_client_errno(ctx->client)));
 159                     goto fail;
 160                 }
 161             } /* if (config->obj.options.mimicmodel) */
 162
 163         }       /* for config*/
 164
 165         if (avahi_entry_group_commit(ctx->group) < 0) {
 166             LOG(log_error, logtype_afpd, "Failed to commit entry group: %s",
 167                 avahi_strerror(avahi_client_errno(ctx->client)));
 168             goto fail;
 169         }
 170
 171     }   /* if avahi_entry_group_is_empty*/
 172
 173     return;
 174
 175 fail:
 176     time(NULL);
 177 //    avahi_threaded_poll_quit(ctx->threaded_poll);
 178 }
 179
 180 /* Called when publishing of service data completes */
 181 static void publish_reply(AvahiEntryGroup *g,
 182                           AvahiEntryGroupState state,
 183                           AVAHI_GCC_UNUSED void *userdata)
 184 {
 185     assert(ctx->group == NULL || g == ctx->group);
 186
 187     switch (state) {
 188
 189     case AVAHI_ENTRY_GROUP_ESTABLISHED :
 190         /* The entry group has been established successfully */
 191         LOG(log_debug, logtype_afpd, "publish_reply: AVAHI_ENTRY_GROUP_ESTABLISHED");
 192         break;
 193
 194     case AVAHI_ENTRY_GROUP_COLLISION:
 195         /* With multiple names there's no way to know which one collided */
 196         LOG(log_error, logtype_afpd, "publish_reply: AVAHI_ENTRY_GROUP_COLLISION",
 197             avahi_strerror(avahi_client_errno(ctx->client)));
 198         avahi_threaded_poll_quit(ctx->threaded_poll);
 199         break;
 200
 201     case AVAHI_ENTRY_GROUP_FAILURE:
 202         LOG(log_error, logtype_afpd, "Failed to register service: %s",
 203             avahi_strerror(avahi_client_errno(ctx->client)));
 204         avahi_threaded_poll_quit(ctx->threaded_poll);
 205         break;
 206
 207     case AVAHI_ENTRY_GROUP_UNCOMMITED:
 208         break;
 209     case AVAHI_ENTRY_GROUP_REGISTERING:
 210         break;
 211     }
 212 }
 213
 214 static void client_callback(AvahiClient *client,
 215                             AvahiClientState state,
 216                             void *userdata)
 217 {
 218     ctx->client = client;
 219
 220     switch (state) {
 221     case AVAHI_CLIENT_S_RUNNING:
 222         /* The server has startup successfully and registered its host
 223          * name on the network, so it's time to create our services */
 224         if (!ctx->group)
 225             register_stuff();
 226         break;
 227
 228     case AVAHI_CLIENT_S_COLLISION:
 229         if (ctx->group)
 230             avahi_entry_group_reset(ctx->group);
 231         break;
 232
 233     case AVAHI_CLIENT_FAILURE: {
 234         if (avahi_client_errno(client) == AVAHI_ERR_DISCONNECTED) {
 235             int error;
 236
 237             avahi_client_free(ctx->client);
 238             ctx->client = NULL;
 239             ctx->group = NULL;
 240
 241             /* Reconnect to the server */
 242             if (!(ctx->client = avahi_client_new(avahi_threaded_poll_get(ctx->threaded_poll),
 243                                                  AVAHI_CLIENT_NO_FAIL,
 244                                                  client_callback,
 245                                                  ctx,
 246                                                  &error))) {
 247
 248                 LOG(log_error, logtype_afpd, "Failed to contact server: %s",
 249                     avahi_strerror(error));
 250
 251                 avahi_threaded_poll_quit(ctx->threaded_poll);
 252             }
 253
 254         } else {
 255             LOG(log_error, logtype_afpd, "Client failure: %s",
 256                 avahi_strerror(avahi_client_errno(client)));
 257             avahi_threaded_poll_quit(ctx->threaded_poll);
 258         }
 259         break;
 260     }
 261
 262     case AVAHI_CLIENT_S_REGISTERING:
 263         break;
 264     case AVAHI_CLIENT_CONNECTING:
 265         break;
 266     }
 267 }
 268
 269 /************************************************************************
 270  * Public funcions
 271  ************************************************************************/
 272
 273 /*
 274  * Tries to setup the Zeroconf thread and any
 275  * neccessary config setting.
 276  */
 277 void av_zeroconf_register(const AFPObj *obj) {
 278     int error;
 279
 280     /* initialize the struct that holds our config settings. */
 281     if (ctx) {
 282         LOG(log_debug, logtype_afpd, "Resetting zeroconf records");
 283         avahi_entry_group_reset(ctx->group);
 284     } else {
 285         ctx = calloc(1, sizeof(struct context));
 286         ctx->obj = obj;
 287         assert(ctx);
 288     }
 289
 290 /* first of all we need to initialize our threading env */
 291     if (!(ctx->threaded_poll = avahi_threaded_poll_new())) {
 292         goto fail;
 293     }
 294
 295 /* now we need to acquire a client */
 296     if (!(ctx->client = avahi_client_new(avahi_threaded_poll_get(ctx->threaded_poll),
 297                                          AVAHI_CLIENT_NO_FAIL,
 298                                          client_callback,
 299                                          NULL,
 300                                          &error))) {
 301         LOG(log_error, logtype_afpd, "Failed to create client object: %s",
 302             avahi_strerror(error));
 303         goto fail;
 304     }
 305
 306     if (avahi_threaded_poll_start(ctx->threaded_poll) < 0) {
 307         LOG(log_error, logtype_afpd, "Failed to create thread: %s",
 308             avahi_strerror(avahi_client_errno(ctx->client)));
 309         goto fail;
 310     } else {
 311         LOG(log_info, logtype_afpd, "Successfully started avahi loop.");
 312     }
 313
 314     ctx->thread_running = 1;
 315     return;
 316
 317 fail:
 318     av_zeroconf_unregister();
 319
 320     return;
 321 }
 322
 323 /*
 324  * Tries to shutdown this loop impl.
 325  * Call this function from inside this thread.
 326  */
 327 int av_zeroconf_unregister() {
 328     LOG(log_error, logtype_afpd, "av_zeroconf_unregister");
 329
 330     if (ctx) {
 331         LOG(log_error, logtype_afpd, "av_zeroconf_unregister: avahi_threaded_poll_stop");
 332         if (ctx->threaded_poll)
 333             avahi_threaded_poll_stop(ctx->threaded_poll);
 334         LOG(log_error, logtype_afpd, "av_zeroconf_unregister: avahi_client_free");
 335         if (ctx->client)
 336             avahi_client_free(ctx->client);
 337         LOG(log_error, logtype_afpd, "av_zeroconf_unregister: avahi_threaded_poll_free");
 338         if (ctx->threaded_poll)
 339             avahi_threaded_poll_free(ctx->threaded_poll);
 340         free(ctx);
 341         ctx = NULL;
 342     }
 343     return 0;
 344 }
 345
 346 #endif /* USE_AVAHI */
 347