source3/nmbd/nmbd_synclists.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   6    Copyright (C) Jeremy Allison 1994-1998
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 */
  22
  23 /* this file handles asynchronous browse synchronisation requests. The
  24    requests are done by forking and putting the result in a file in the
  25    locks directory. We do it this way because we don't want nmbd to be
  26    blocked waiting for some server to respond on a TCP connection. This
  27    also allows us to have more than 1 sync going at once (tridge) */
  28
  29 #include "includes.h"
  30 #include "system/filesys.h"
  31 #include "../librpc/gen_ndr/svcctl.h"
  32 #include "nmbd/nmbd.h"
  33 #include "libsmb/clirap.h"
  34
  35 struct sync_record {
  36         struct sync_record *next, *prev;
  37         unstring workgroup;
  38         unstring server;
  39         char *fname;
  40         struct in_addr ip;
  41         pid_t pid;
  42 };
  43
  44 /* a linked list of current sync connections */
  45 static struct sync_record *syncs;
  46
  47 static XFILE *fp;
  48
  49 /*******************************************************************
  50   This is the NetServerEnum callback.
  51   Note sname and comment are in UNIX codepage format.
  52   ******************************************************************/
  53
  54 static void callback(const char *sname, uint32 stype,
  55                      const char *comment, void *state)
  56 {
  57         x_fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
  58 }
  59
  60 /*******************************************************************
  61   Synchronise browse lists with another browse server.
  62   Log in on the remote server's SMB port to their IPC$ service,
  63   do a NetServerEnum and record the results in fname
  64 ******************************************************************/
  65
  66 static void sync_child(char *name, int nm_type,
  67                        char *workgroup,
  68                        struct in_addr ip, bool local, bool servers,
  69                        char *fname)
  70 {
  71         fstring unix_workgroup;
  72         struct cli_state *cli;
  73         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
  74         struct nmb_name called, calling;
  75         struct sockaddr_storage ss;
  76         NTSTATUS status;
  77
  78         /* W2K DMB's return empty browse lists on port 445. Use 139.
  79          * Patch from Andy Levine andyl@epicrealm.com.
  80          */
  81
  82         cli = cli_initialise();
  83         if (!cli) {
  84                 return;
  85         }
  86
  87         cli_set_port(cli, 139);
  88
  89         in_addr_to_sockaddr_storage(&ss, ip);
  90         status = cli_connect(cli, name, &ss);
  91         if (!NT_STATUS_IS_OK(status)) {
  92                 cli_shutdown(cli);
  93                 return;
  94         }
  95
  96         make_nmb_name(&calling, get_local_machine_name(), 0x0);
  97         make_nmb_name(&called , name, nm_type);
  98
  99         if (!cli_session_request(cli, &calling, &called)) {
 100                 cli_shutdown(cli);
 101                 return;
 102         }
 103
 104         status = cli_negprot(cli);
 105         if (!NT_STATUS_IS_OK(status)) {
 106                 cli_shutdown(cli);
 107                 return;
 108         }
 109
 110         if (!NT_STATUS_IS_OK(cli_session_setup(cli, "", "", 1, "", 0,
 111                                                workgroup))) {
 112                 cli_shutdown(cli);
 113                 return;
 114         }
 115
 116         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", "", 1))) {
 117                 cli_shutdown(cli);
 118                 return;
 119         }
 120
 121         /* All the cli_XX functions take UNIX character set. */
 122         fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup);
 123
 124         /* Fetch a workgroup list. */
 125         cli_NetServerEnum(cli, unix_workgroup,
 126                           local_type|SV_TYPE_DOMAIN_ENUM,
 127                           callback, NULL);
 128
 129         /* Now fetch a server list. */
 130         if (servers) {
 131                 fstrcpy(unix_workgroup, workgroup);
 132                 cli_NetServerEnum(cli, unix_workgroup,
 133                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
 134                                   callback, NULL);
 135         }
 136
 137         cli_shutdown(cli);
 138 }
 139
 140 /*******************************************************************
 141   initialise a browse sync with another browse server.  Log in on the
 142   remote server's SMB port to their IPC$ service, do a NetServerEnum
 143   and record the results
 144 ******************************************************************/
 145
 146 void sync_browse_lists(struct work_record *work,
 147                        char *name, int nm_type,
 148                        struct in_addr ip, bool local, bool servers)
 149 {
 150         struct sync_record *s;
 151         static int counter;
 152
 153         START_PROFILE(sync_browse_lists);
 154         /* Check we're not trying to sync with ourselves. This can
 155            happen if we are a domain *and* a local master browser. */
 156         if (ismyip_v4(ip)) {
 157 done:
 158                 END_PROFILE(sync_browse_lists);
 159                 return;
 160         }
 161
 162         s = SMB_MALLOC_P(struct sync_record);
 163         if (!s) goto done;
 164
 165         ZERO_STRUCTP(s);
 166
 167         unstrcpy(s->workgroup, work->work_group);
 168         unstrcpy(s->server, name);
 169         s->ip = ip;
 170
 171         if (asprintf(&s->fname, "%s/sync.%d", lp_lockdir(), counter++) < 0) {
 172                 SAFE_FREE(s);
 173                 goto done;
 174         }
 175         /* Safe to use as 0 means no size change. */
 176         all_string_sub(s->fname,"//", "/", 0);
 177
 178         DLIST_ADD(syncs, s);
 179
 180         /* the parent forks and returns, leaving the child to do the
 181            actual sync and call END_PROFILE*/
 182         CatchChild();
 183         if ((s->pid = sys_fork())) return;
 184
 185         BlockSignals( False, SIGTERM );
 186
 187         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
 188                  work->work_group, name, inet_ntoa(ip)));
 189
 190         fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644);
 191         if (!fp) {
 192                 END_PROFILE(sync_browse_lists);
 193                 _exit(1);
 194         }
 195
 196         sync_child(name, nm_type, work->work_group, ip, local, servers,
 197                    s->fname);
 198
 199         x_fclose(fp);
 200         END_PROFILE(sync_browse_lists);
 201         _exit(0);
 202 }
 203
 204 /**********************************************************************
 205  Handle one line from a completed sync file.
 206  **********************************************************************/
 207
 208 static void complete_one(struct sync_record *s,
 209                          char *sname, uint32 stype, char *comment)
 210 {
 211         struct work_record *work;
 212         struct server_record *servrec;
 213
 214         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 215
 216         if (stype & SV_TYPE_DOMAIN_ENUM) {
 217                 /* See if we can find the workgroup on this subnet. */
 218                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
 219                         /* We already know about this workgroup -
 220                            update the ttl. */
 221                         update_workgroup_ttl(work,lp_max_ttl());
 222                 } else {
 223                         /* Create the workgroup on the subnet. */
 224                         work = create_workgroup_on_subnet(unicast_subnet,
 225                                                           sname, lp_max_ttl());
 226                         if (work) {
 227                                 /* remember who the master is */
 228                                 unstrcpy(work->local_master_browser_name, comment);
 229                         }
 230                 }
 231                 return;
 232         }
 233
 234         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
 235         if (!work) {
 236                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
 237                          s->workgroup));
 238                 return;
 239         }
 240
 241         if ((servrec = find_server_in_workgroup( work, sname))) {
 242                 /* Check that this is not a locally known
 243                    server - if so ignore the entry. */
 244                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
 245                         /* We already know about this server - update
 246                            the ttl. */
 247                         update_server_ttl(servrec, lp_max_ttl());
 248                         /* Update the type. */
 249                         servrec->serv.type = stype;
 250                 }
 251                 return;
 252         }
 253
 254         /* Create the server in the workgroup. */
 255         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
 256 }
 257
 258 /**********************************************************************
 259  Read the completed sync info.
 260 **********************************************************************/
 261
 262 static void complete_sync(struct sync_record *s)
 263 {
 264         XFILE *f;
 265         char *server;
 266         char *type_str;
 267         unsigned type;
 268         char *comment;
 269         char line[1024];
 270         const char *ptr;
 271         int count=0;
 272
 273         f = x_fopen(s->fname,O_RDONLY, 0);
 274
 275         if (!f)
 276                 return;
 277
 278         while (!x_feof(f)) {
 279                 TALLOC_CTX *frame = NULL;
 280
 281                 if (!fgets_slash(line,sizeof(line),f))
 282                         continue;
 283
 284                 ptr = line;
 285
 286                 frame = talloc_stackframe();
 287                 if (!next_token_talloc(frame,&ptr,&server,NULL) ||
 288                     !next_token_talloc(frame,&ptr,&type_str,NULL) ||
 289                     !next_token_talloc(frame,&ptr,&comment,NULL)) {
 290                         TALLOC_FREE(frame);
 291                         continue;
 292                 }
 293
 294                 sscanf(type_str, "%X", &type);
 295
 296                 complete_one(s, server, type, comment);
 297
 298                 count++;
 299                 TALLOC_FREE(frame);
 300         }
 301         x_fclose(f);
 302
 303         unlink(s->fname);
 304
 305         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
 306                  s->server, inet_ntoa(s->ip), s->workgroup, count));
 307 }
 308
 309 /**********************************************************************
 310  Check for completion of any of the child processes.
 311 **********************************************************************/
 312
 313 void sync_check_completion(void)
 314 {
 315         struct sync_record *s, *next;
 316
 317         for (s=syncs;s;s=next) {
 318                 next = s->next;
 319                 if (!process_exists_by_pid(s->pid)) {
 320                         /* it has completed - grab the info */
 321                         complete_sync(s);
 322                         DLIST_REMOVE(syncs, s);
 323                         SAFE_FREE(s->fname);
 324                         SAFE_FREE(s);
 325                 }
 326         }
 327 }