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                 int dk = 0;
 112                 AvahiStringList *adisk = NULL;
 113                 AvahiStringList *adisk2 = NULL;
 114
 115                 DBG_DEBUG("AVAHI_CLIENT_S_RUNNING\n");
 116
 117                 state->entry_group = avahi_entry_group_new(
 118                         c, avahi_entry_group_callback, state);
 119                 if (state->entry_group == NULL) {
 120                         error = avahi_client_errno(c);
 121                         DBG_DEBUG("avahi_entry_group_new failed: %s\n",
 122                                   avahi_strerror(error));
 123                         break;
 124                 }
 125
 126                 error = avahi_entry_group_add_service(
 127                             state->entry_group, AVAHI_IF_UNSPEC,
 128                             AVAHI_PROTO_UNSPEC, 0, lp_netbios_name(),
 129                             "_smb._tcp", NULL, NULL, state->port, NULL);
 130                 if (error != AVAHI_OK) {
 131                         DBG_DEBUG("avahi_entry_group_add_service failed: %s\n",
 132                                   avahi_strerror(error));
 133                         avahi_entry_group_free(state->entry_group);
 134                         state->entry_group = NULL;
 135                         break;
 136                 }
 137
 138                 for (snum = 0; snum < num_services; snum++) {
 139                         if (lp_snum_ok(snum) &&
 140                             lp_parm_bool(snum, "fruit", "time machine", false))
 141                         {
 142                                 adisk2 = avahi_string_list_add_printf(
 143                                             adisk, "dk%d=adVN=%s,adVF=0x82",
 144                                             dk++, lp_const_servicename(snum));
 145                                 if (adisk2 == NULL) {
 146                                         DBG_DEBUG("avahi_string_list_add_printf"
 147                                                   "failed: returned NULL\n");
 148                                         avahi_string_list_free(adisk);
 149                                         avahi_entry_group_free(state->entry_group);
 150                                         state->entry_group = NULL;
 151                                         break;
 152                                 }
 153                                 adisk = adisk2;
 154                                 adisk2 = NULL;
 155                         }
 156                 }
 157                 if (dk > 0) {
 158                         adisk2 = avahi_string_list_add(adisk, "sys=adVF=0x100");
 159                         if (adisk2 == NULL) {
 160                                 DBG_DEBUG("avahi_string_list_add failed: "
 161                                           "returned NULL\n");
 162                                 avahi_string_list_free(adisk);
 163                                 avahi_entry_group_free(state->entry_group);
 164                                 state->entry_group = NULL;
 165                                 break;
 166                         }
 167                         adisk = adisk2;
 168                         adisk2 = NULL;
 169
 170                         error = avahi_entry_group_add_service_strlst(
 171                                     state->entry_group, AVAHI_IF_UNSPEC,
 172                                     AVAHI_PROTO_UNSPEC, 0, lp_netbios_name(),
 173                                     "_adisk._tcp", NULL, NULL, 0, adisk);
 174                         avahi_string_list_free(adisk);
 175                         adisk = NULL;
 176                         if (error != AVAHI_OK) {
 177                                 DBG_DEBUG("avahi_entry_group_add_service_strlst "
 178                                           "failed: %s\n", avahi_strerror(error));
 179                                 avahi_entry_group_free(state->entry_group);
 180                                 state->entry_group = NULL;
 181                                 break;
 182                         }
 183                 }
 184
 185                 error = avahi_entry_group_commit(state->entry_group);
 186                 if (error != AVAHI_OK) {
 187                         DBG_DEBUG("avahi_entry_group_commit failed: %s\n",
 188                                   avahi_strerror(error));
 189                         avahi_entry_group_free(state->entry_group);
 190                         state->entry_group = NULL;
 191                         break;
 192                 }
 193                 break;
 194         }
 195         case AVAHI_CLIENT_FAILURE:
 196                 error = avahi_client_errno(c);
 197
 198                 DBG_DEBUG("AVAHI_CLIENT_FAILURE: %s\n", avahi_strerror(error));
 199
 200                 if (error != AVAHI_ERR_DISCONNECTED) {
 201                         break;
 202                 }
 203                 avahi_client_free(c);
 204                 state->client = avahi_client_new(state->poll, AVAHI_CLIENT_NO_FAIL,
 205                                                  avahi_client_callback, state,
 206                                                  &error);
 207                 if (state->client == NULL) {
 208                         DBG_DEBUG("avahi_client_new failed: %s\n",
 209                                   avahi_strerror(error));
 210                         break;
 211                 }
 212                 break;
 213         case AVAHI_CLIENT_S_COLLISION:
 214                 DBG_DEBUG("AVAHI_CLIENT_S_COLLISION\n");
 215                 break;
 216         case AVAHI_CLIENT_S_REGISTERING:
 217                 DBG_DEBUG("AVAHI_CLIENT_S_REGISTERING\n");
 218                 break;
 219         case AVAHI_CLIENT_CONNECTING:
 220                 DBG_DEBUG("AVAHI_CLIENT_CONNECTING\n");
 221                 break;
 222         }
 223 }
 224
 225 void *avahi_start_register(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
 226                            uint16_t port)
 227 {
 228         struct avahi_state_struct *state;
 229         int error;
 230
 231         avahi_allocator_ctx = talloc_new(mem_ctx);
 232         if (avahi_allocator_ctx == NULL) {
 233                 return NULL;
 234         }
 235         avahi_set_allocator(&avahi_talloc_allocator);
 236
 237         state = talloc(mem_ctx, struct avahi_state_struct);
 238         if (state == NULL) {
 239                 return state;
 240         }
 241         state->port = port;
 242         state->poll = tevent_avahi_poll(state, ev);
 243         if (state->poll == NULL) {
 244                 goto fail;
 245         }
 246         state->client = avahi_client_new(state->poll, AVAHI_CLIENT_NO_FAIL,
 247                                          avahi_client_callback, state,
 248                                          &error);
 249         if (state->client == NULL) {
 250                 DBG_DEBUG("avahi_client_new failed: %s\n",
 251                           avahi_strerror(error));
 252                 goto fail;
 253         }
 254         return state;
 255
 256  fail:
 257         TALLOC_FREE(state);
 258         return NULL;
 259 }