source3/smbd/avahi_register.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * Register _smb._tcp with avahi
   4  *
   5  * Copyright (C) Volker Lendecke 2009
   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 as published by
   9  * the Free Software Foundation; either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "includes.h"
  22 #include "smbd/smbd.h"
  23
  24 #include <avahi-client/client.h>
  25 #include <avahi-client/publish.h>
  26 #include <avahi-common/error.h>
  27 #include <avahi-common/malloc.h>
  28 #include <avahi-common/strlst.h>
  29
  30 struct avahi_state_struct {
  31         struct AvahiPoll *poll;
  32         AvahiClient *client;
  33         AvahiEntryGroup *entry_group;
  34         uint16_t port;
  35 };
  36
  37 static void *avahi_allocator_ctx = NULL;
  38
  39 static void * avahi_allocator_malloc(size_t size)
  40 {
  41         return talloc_size(avahi_allocator_ctx, size);
  42 }
  43
  44 static void avahi_allocator_free(void *p)
  45 {
  46         TALLOC_FREE(p);
  47 }
  48
  49 static void * avahi_allocator_realloc(void *p, size_t size)
  50 {
  51         return talloc_realloc_size(avahi_allocator_ctx, p, size);
  52 }
  53
  54 static void * avahi_allocator_calloc(size_t count, size_t size)
  55 {
  56         void *p = talloc_array_size(avahi_allocator_ctx, size, count);
  57         if (p) {
  58                 memset(p, 0, size * count);
  59         }
  60         return p;
  61 }
  62
  63 static const struct AvahiAllocator avahi_talloc_allocator = {
  64         &avahi_allocator_malloc,
  65         &avahi_allocator_free,
  66         &avahi_allocator_realloc,
  67         &avahi_allocator_calloc
  68 };
  69
  70 static void avahi_entry_group_callback(AvahiEntryGroup *g,
  71                                        AvahiEntryGroupState status,
  72                                        void *userdata)
  73 {
  74         struct avahi_state_struct *state = talloc_get_type_abort(
  75                 userdata, struct avahi_state_struct);
  76         int error;
  77
  78         switch (status) {
  79         case AVAHI_ENTRY_GROUP_ESTABLISHED:
  80                 DBG_DEBUG("AVAHI_ENTRY_GROUP_ESTABLISHED\n");
  81                 break;
  82         case AVAHI_ENTRY_GROUP_FAILURE:
  83                 error = avahi_client_errno(state->client);
  84
  85                 DBG_DEBUG("AVAHI_ENTRY_GROUP_FAILURE: %s\n",
  86                           avahi_strerror(error));
  87                 break;
  88         case AVAHI_ENTRY_GROUP_COLLISION:
  89                 DBG_DEBUG("AVAHI_ENTRY_GROUP_COLLISION\n");
  90                 break;
  91         case AVAHI_ENTRY_GROUP_UNCOMMITED:
  92                 DBG_DEBUG("AVAHI_ENTRY_GROUP_UNCOMMITED\n");
  93                 break;
  94         case AVAHI_ENTRY_GROUP_REGISTERING:
  95                 DBG_DEBUG("AVAHI_ENTRY_GROUP_REGISTERING\n");
  96                 break;
  97         }
  98 }
  99
 100 static void avahi_client_callback(AvahiClient *c, AvahiClientState status,
 101                                   void *userdata)
 102 {
 103         struct avahi_state_struct *state = talloc_get_type_abort(
 104                 userdata, struct avahi_state_struct);
 105         int error;
 106
 107         switch (status) {
 108         case AVAHI_CLIENT_S_RUNNING: {
 109                 int snum;
 110                 int num_services = lp_numservices();
 111                 size_t dk = 0;
 112                 AvahiStringList *adisk = NULL;
 113                 AvahiStringList *adisk2 = NULL;
 114                 AvahiStringList *dinfo = NULL;
 115                 const char *hostname = NULL;
 116                 enum mdns_name_values mdns_name = lp_mdns_name();
 117                 const char *model = NULL;
 118
 119                 DBG_DEBUG("AVAHI_CLIENT_S_RUNNING\n");
 120
 121                 switch (mdns_name) {
 122                 case MDNS_NAME_MDNS:
 123                         hostname = avahi_client_get_host_name(c);
 124                         break;
 125                 case MDNS_NAME_NETBIOS:
 126                         hostname = lp_netbios_name();
 127                         break;
 128                 default:
 129                         DBG_ERR("Unhandled mdns_name %d\n", mdns_name);
 130                         return;
 131                 }
 132
 133                 state->entry_group = avahi_entry_group_new(
 134                         c, avahi_entry_group_callback, state);
 135                 if (state->entry_group == NULL) {
 136                         error = avahi_client_errno(c);
 137                         DBG_DEBUG("avahi_entry_group_new failed: %s\n",
 138                                   avahi_strerror(error));
 139                         break;
 140                 }
 141
 142                 error = avahi_entry_group_add_service(
 143                             state->entry_group, AVAHI_IF_UNSPEC,
 144                             AVAHI_PROTO_UNSPEC, 0, hostname,
 145                             "_smb._tcp", NULL, NULL, state->port, NULL);
 146                 if (error != AVAHI_OK) {
 147                         DBG_DEBUG("avahi_entry_group_add_service failed: %s\n",
 148                                   avahi_strerror(error));
 149                         avahi_entry_group_free(state->entry_group);
 150                         state->entry_group = NULL;
 151                         break;
 152                 }
 153
 154                 for (snum = 0; snum < num_services; snum++) {
 155                         if (lp_snum_ok(snum) &&
 156                             lp_parm_bool(snum, "fruit", "time machine", false))
 157                         {
 158                                 adisk2 = avahi_string_list_add_printf(
 159                                             adisk, "dk%zu=adVN=%s,adVF=0x82",
 160                                             dk++, lp_const_servicename(snum));
 161                                 if (adisk2 == NULL) {
 162                                         DBG_DEBUG("avahi_string_list_add_printf"
 163                                                   "failed: returned NULL\n");
 164                                         avahi_string_list_free(adisk);
 165                                         avahi_entry_group_free(state->entry_group);
 166                                         state->entry_group = NULL;
 167                                         break;
 168                                 }
 169                                 adisk = adisk2;
 170                                 adisk2 = NULL;
 171                         }
 172                 }
 173                 if (dk > 0) {
 174                         adisk2 = avahi_string_list_add(adisk, "sys=adVF=0x100");
 175                         if (adisk2 == NULL) {
 176                                 DBG_DEBUG("avahi_string_list_add failed: "
 177                                           "returned NULL\n");
 178                                 avahi_string_list_free(adisk);
 179                                 avahi_entry_group_free(state->entry_group);
 180                                 state->entry_group = NULL;
 181                                 break;
 182                         }
 183                         adisk = adisk2;
 184                         adisk2 = NULL;
 185
 186                         error = avahi_entry_group_add_service_strlst(
 187                                     state->entry_group, AVAHI_IF_UNSPEC,
 188                                     AVAHI_PROTO_UNSPEC, 0, hostname,
 189                                     "_adisk._tcp", NULL, NULL, 0, adisk);
 190                         avahi_string_list_free(adisk);
 191                         adisk = NULL;
 192                         if (error != AVAHI_OK) {
 193                                 DBG_DEBUG("avahi_entry_group_add_service_strlst "
 194                                           "failed: %s\n", avahi_strerror(error));
 195                                 avahi_entry_group_free(state->entry_group);
 196                                 state->entry_group = NULL;
 197                                 break;
 198                         }
 199                 }
 200
 201                 model = lp_parm_const_string(-1, "fruit", "model", "MacSamba");
 202
 203                 dinfo = avahi_string_list_add_printf(NULL, "model=%s", model);
 204                 if (dinfo == NULL) {
 205                         DBG_DEBUG("avahi_string_list_add_printf"
 206                                   "failed: returned NULL\n");
 207                         avahi_entry_group_free(state->entry_group);
 208                         state->entry_group = NULL;
 209                         break;
 210                 }
 211
 212                 error = avahi_entry_group_add_service_strlst(
 213                             state->entry_group, AVAHI_IF_UNSPEC,
 214                             AVAHI_PROTO_UNSPEC, 0, hostname,
 215                             "_device-info._tcp", NULL, NULL, 0,
 216                             dinfo);
 217                 avahi_string_list_free(dinfo);
 218                 if (error != AVAHI_OK) {
 219                         DBG_DEBUG("avahi_entry_group_add_service failed: %s\n",
 220                                   avahi_strerror(error));
 221                         avahi_entry_group_free(state->entry_group);
 222                         state->entry_group = NULL;
 223                         break;
 224                 }
 225
 226                 error = avahi_entry_group_commit(state->entry_group);
 227                 if (error != AVAHI_OK) {
 228                         DBG_DEBUG("avahi_entry_group_commit failed: %s\n",
 229                                   avahi_strerror(error));
 230                         avahi_entry_group_free(state->entry_group);
 231                         state->entry_group = NULL;
 232                         break;
 233                 }
 234                 break;
 235         }
 236         case AVAHI_CLIENT_FAILURE:
 237                 error = avahi_client_errno(c);
 238
 239                 DBG_DEBUG("AVAHI_CLIENT_FAILURE: %s\n", avahi_strerror(error));
 240
 241                 if (error != AVAHI_ERR_DISCONNECTED) {
 242                         break;
 243                 }
 244                 avahi_client_free(c);
 245                 state->client = avahi_client_new(state->poll, AVAHI_CLIENT_NO_FAIL,
 246                                                  avahi_client_callback, state,
 247                                                  &error);
 248                 if (state->client == NULL) {
 249                         DBG_DEBUG("avahi_client_new failed: %s\n",
 250                                   avahi_strerror(error));
 251                         break;
 252                 }
 253                 break;
 254         case AVAHI_CLIENT_S_COLLISION:
 255                 DBG_DEBUG("AVAHI_CLIENT_S_COLLISION\n");
 256                 break;
 257         case AVAHI_CLIENT_S_REGISTERING:
 258                 DBG_DEBUG("AVAHI_CLIENT_S_REGISTERING\n");
 259                 break;
 260         case AVAHI_CLIENT_CONNECTING:
 261                 DBG_DEBUG("AVAHI_CLIENT_CONNECTING\n");
 262                 break;
 263         }
 264 }
 265
 266 void *avahi_start_register(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
 267                            uint16_t port)
 268 {
 269         struct avahi_state_struct *state;
 270         int error;
 271
 272         avahi_allocator_ctx = talloc_new(mem_ctx);
 273         if (avahi_allocator_ctx == NULL) {
 274                 return NULL;
 275         }
 276         avahi_set_allocator(&avahi_talloc_allocator);
 277
 278         state = talloc(mem_ctx, struct avahi_state_struct);
 279         if (state == NULL) {
 280                 return state;
 281         }
 282         state->port = port;
 283         state->poll = tevent_avahi_poll(state, ev);
 284         if (state->poll == NULL) {
 285                 goto fail;
 286         }
 287         state->client = avahi_client_new(state->poll, AVAHI_CLIENT_NO_FAIL,
 288                                          avahi_client_callback, state,
 289                                          &error);
 290         if (state->client == NULL) {
 291                 DBG_DEBUG("avahi_client_new failed: %s\n",
 292                           avahi_strerror(error));
 293                 goto fail;
 294         }
 295         return state;
 296
 297  fail:
 298         TALLOC_FREE(state);
 299         return NULL;
 300 }