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 AFPConfig *config;
  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 (config = ctx->configs; config; config = config->next) {
  96
  97             dsi = (DSI *)config->obj.dsi;
  98             port = getip_port((struct sockaddr *)&dsi->server);
  99
 100             if (convert_string(config->obj.options.unixcharset,
 101                                CH_UTF8,
 102                                config->obj.options.server ?
 103                                config->obj.options.server :
 104                                config->obj.options.hostname,
 105                                -1,
 106                                name,
 107                                MAXINSTANCENAMELEN) <= 0) {
 108                 LOG(log_error, logtype_afpd, "Could not set Zeroconf instance name");
 109                 goto fail;
 110             }
 111             if ((dsi->bonjourname = strdup(name)) == NULL) {
 112                 LOG(log_error, logtype_afpd, "Could not set Zeroconf instance name");
 113                 goto fail;
 114
 115             }
 116             LOG(log_info, logtype_afpd, "Registering server '%s' with Bonjour",
 117                 dsi->bonjourname);
 118
 119             if (avahi_entry_group_add_service(ctx->group,
 120                                               AVAHI_IF_UNSPEC,
 121                                               AVAHI_PROTO_UNSPEC,
 122                                               0,
 123                                               dsi->bonjourname,
 124                                               AFP_DNS_SERVICE_TYPE,
 125                                               NULL,
 126                                               NULL,
 127                                               port,
 128                                               NULL) < 0) {
 129                 LOG(log_error, logtype_afpd, "Failed to add service: %s",
 130                     avahi_strerror(avahi_client_errno(ctx->client)));
 131                 goto fail;
 132             }
 133
 134             if (i && avahi_entry_group_add_service_strlst(ctx->group,
 135                                                           AVAHI_IF_UNSPEC,
 136                                                           AVAHI_PROTO_UNSPEC,
 137                                                           0,
 138                                                           dsi->bonjourname,
 139                                                           ADISK_SERVICE_TYPE,
 140                                                           NULL,
 141                                                           NULL,
 142                                                           9, /* discard */
 143                                                           strlist) < 0) {
 144                 LOG(log_error, logtype_afpd, "Failed to add service: %s",
 145                     avahi_strerror(avahi_client_errno(ctx->client)));
 146                 goto fail;
 147             }   /* if */
 148
 149             if (config->obj.options.mimicmodel) {
 150                 strlist2 = avahi_string_list_add_printf(strlist2, "model=%s", config->obj.options.mimicmodel);
 151                 if (avahi_entry_group_add_service_strlst(ctx->group,
 152                                                          AVAHI_IF_UNSPEC,
 153                                                          AVAHI_PROTO_UNSPEC,
 154                                                          0,
 155                                                          dsi->bonjourname,
 156                                                          DEV_INFO_SERVICE_TYPE,
 157                                                          NULL,
 158                                                          NULL,
 159                                                          0,
 160                                                          strlist2) < 0) {
 161                     LOG(log_error, logtype_afpd, "Failed to add service: %s",
 162                         avahi_strerror(avahi_client_errno(ctx->client)));
 163                     goto fail;
 164                 }
 165             } /* if (config->obj.options.mimicmodel) */
 166
 167         }       /* for config*/
 168
 169         if (avahi_entry_group_commit(ctx->group) < 0) {
 170             LOG(log_error, logtype_afpd, "Failed to commit entry group: %s",
 171                 avahi_strerror(avahi_client_errno(ctx->client)));
 172             goto fail;
 173         }
 174
 175     }   /* if avahi_entry_group_is_empty*/
 176
 177     return;
 178
 179 fail:
 180     time(NULL);
 181 //    avahi_threaded_poll_quit(ctx->threaded_poll);
 182 }
 183
 184 /* Called when publishing of service data completes */
 185 static void publish_reply(AvahiEntryGroup *g,
 186                           AvahiEntryGroupState state,
 187                           AVAHI_GCC_UNUSED void *userdata)
 188 {
 189     assert(ctx->group == NULL || g == ctx->group);
 190
 191     switch (state) {
 192
 193     case AVAHI_ENTRY_GROUP_ESTABLISHED :
 194         /* The entry group has been established successfully */
 195         LOG(log_debug, logtype_afpd, "publish_reply: AVAHI_ENTRY_GROUP_ESTABLISHED");
 196         break;
 197
 198     case AVAHI_ENTRY_GROUP_COLLISION:
 199         /* With multiple names there's no way to know which one collided */
 200         LOG(log_error, logtype_afpd, "publish_reply: AVAHI_ENTRY_GROUP_COLLISION",
 201             avahi_strerror(avahi_client_errno(ctx->client)));
 202         avahi_threaded_poll_quit(ctx->threaded_poll);
 203         break;
 204
 205     case AVAHI_ENTRY_GROUP_FAILURE:
 206         LOG(log_error, logtype_afpd, "Failed to register service: %s",
 207             avahi_strerror(avahi_client_errno(ctx->client)));
 208         avahi_threaded_poll_quit(ctx->threaded_poll);
 209         break;
 210
 211     case AVAHI_ENTRY_GROUP_UNCOMMITED:
 212         break;
 213     case AVAHI_ENTRY_GROUP_REGISTERING:
 214         break;
 215     }
 216 }
 217
 218 static void client_callback(AvahiClient *client,
 219                             AvahiClientState state,
 220                             void *userdata)
 221 {
 222     ctx->client = client;
 223
 224     switch (state) {
 225     case AVAHI_CLIENT_S_RUNNING:
 226         /* The server has startup successfully and registered its host
 227          * name on the network, so it's time to create our services */
 228         if (!ctx->group)
 229             register_stuff();
 230         break;
 231
 232     case AVAHI_CLIENT_S_COLLISION:
 233         if (ctx->group)
 234             avahi_entry_group_reset(ctx->group);
 235         break;
 236
 237     case AVAHI_CLIENT_FAILURE: {
 238         if (avahi_client_errno(client) == AVAHI_ERR_DISCONNECTED) {
 239             int error;
 240
 241             avahi_client_free(ctx->client);
 242             ctx->client = NULL;
 243             ctx->group = NULL;
 244
 245             /* Reconnect to the server */
 246             if (!(ctx->client = avahi_client_new(avahi_threaded_poll_get(ctx->threaded_poll),
 247                                                  AVAHI_CLIENT_NO_FAIL,
 248                                                  client_callback,
 249                                                  ctx,
 250                                                  &error))) {
 251
 252                 LOG(log_error, logtype_afpd, "Failed to contact server: %s",
 253                     avahi_strerror(error));
 254
 255                 avahi_threaded_poll_quit(ctx->threaded_poll);
 256             }
 257
 258         } else {
 259             LOG(log_error, logtype_afpd, "Client failure: %s",
 260                 avahi_strerror(avahi_client_errno(client)));
 261             avahi_threaded_poll_quit(ctx->threaded_poll);
 262         }
 263         break;
 264     }
 265
 266     case AVAHI_CLIENT_S_REGISTERING:
 267         break;
 268     case AVAHI_CLIENT_CONNECTING:
 269         break;
 270     }
 271 }
 272
 273 /************************************************************************
 274  * Public funcions
 275  ************************************************************************/
 276
 277 /*
 278  * Tries to setup the Zeroconf thread and any
 279  * neccessary config setting.
 280  */
 281 void av_zeroconf_register(const AFPConfig *configs) {
 282     int error;
 283
 284     /* initialize the struct that holds our config settings. */
 285     if (ctx) {
 286         LOG(log_debug, logtype_afpd, "Resetting zeroconf records");
 287         avahi_entry_group_reset(ctx->group);
 288     } else {
 289         ctx = calloc(1, sizeof(struct context));
 290         ctx->configs = configs;
 291         assert(ctx);
 292     }
 293
 294 /* first of all we need to initialize our threading env */
 295     if (!(ctx->threaded_poll = avahi_threaded_poll_new())) {
 296         goto fail;
 297     }
 298
 299 /* now we need to acquire a client */
 300     if (!(ctx->client = avahi_client_new(avahi_threaded_poll_get(ctx->threaded_poll),
 301                                          AVAHI_CLIENT_NO_FAIL,
 302                                          client_callback,
 303                                          NULL,
 304                                          &error))) {
 305         LOG(log_error, logtype_afpd, "Failed to create client object: %s",
 306             avahi_strerror(error));
 307         goto fail;
 308     }
 309
 310     if (avahi_threaded_poll_start(ctx->threaded_poll) < 0) {
 311         LOG(log_error, logtype_afpd, "Failed to create thread: %s",
 312             avahi_strerror(avahi_client_errno(ctx->client)));
 313         goto fail;
 314     } else {
 315         LOG(log_info, logtype_afpd, "Successfully started avahi loop.");
 316     }
 317
 318     ctx->thread_running = 1;
 319     return;
 320
 321 fail:
 322     av_zeroconf_unregister();
 323
 324     return;
 325 }
 326
 327 /*
 328  * Tries to shutdown this loop impl.
 329  * Call this function from inside this thread.
 330  */
 331 int av_zeroconf_unregister() {
 332     LOG(log_error, logtype_afpd, "av_zeroconf_unregister");
 333
 334     if (ctx) {
 335         LOG(log_error, logtype_afpd, "av_zeroconf_unregister: avahi_threaded_poll_stop");
 336         if (ctx->threaded_poll)
 337             avahi_threaded_poll_stop(ctx->threaded_poll);
 338         LOG(log_error, logtype_afpd, "av_zeroconf_unregister: avahi_client_free");
 339         if (ctx->client)
 340             avahi_client_free(ctx->client);
 341         LOG(log_error, logtype_afpd, "av_zeroconf_unregister: avahi_threaded_poll_free");
 342         if (ctx->threaded_poll)
 343             avahi_threaded_poll_free(ctx->threaded_poll);
 344         free(ctx);
 345         ctx = NULL;
 346     }
 347     return 0;
 348 }
 349
 350 #endif /* USE_AVAHI */
 351