source/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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 /* this file handles asynchronous browse synchronisation requests. The
  25    requests are done by forking and putting the result in a file in the
  26    locks directory. We do it this way because we don't want nmbd to be
  27    blocked waiting for some server to respond on a TCP connection. This
  28    also allows us to have more than 1 sync going at once (tridge) */
  29
  30 #include "includes.h"
  31
  32 struct sync_record {
  33         struct sync_record *next, *prev;
  34         fstring workgroup;
  35         fstring server;
  36         pstring fname;
  37         struct in_addr ip;
  38         pid_t pid;
  39 };
  40
  41 /* a linked list of current sync connections */
  42 static struct sync_record *syncs;
  43
  44 static XFILE *fp;
  45
  46 /*******************************************************************
  47   This is the NetServerEnum callback.
  48   Note sname and comment are in UNIX codepage format.
  49   ******************************************************************/
  50 static void callback(const char *sname, uint32 stype,
  51                      const char *comment, void *state)
  52 {
  53         x_fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
  54 }
  55
  56 /*******************************************************************
  57   Synchronise browse lists with another browse server.
  58   Log in on the remote server's SMB port to their IPC$ service,
  59   do a NetServerEnum and record the results in fname
  60 ******************************************************************/
  61 static void sync_child(char *name, int nm_type,
  62                        char *workgroup,
  63                        struct in_addr ip, BOOL local, BOOL servers,
  64                        char *fname)
  65 {
  66         extern fstring local_machine;
  67         fstring unix_workgroup;
  68         static struct cli_state cli;
  69         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
  70         struct nmb_name called, calling;
  71
  72         /* W2K DMB's return empty browse lists on port 445. Use 139.
  73          * Patch from Andy Levine andyl@epicrealm.com.
  74          */
  75
  76         if (!cli_initialise(&cli) || !cli_set_port(&cli, 139) || !cli_connect(&cli, name, &ip)) {
  77                 return;
  78         }
  79
  80         make_nmb_name(&calling, local_machine, 0x0);
  81         make_nmb_name(&called , name         , nm_type);
  82
  83         if (!cli_session_request(&cli, &calling, &called))
  84         {
  85                 cli_shutdown(&cli);
  86                 return;
  87         }
  88
  89         if (!cli_negprot(&cli)) {
  90                 cli_shutdown(&cli);
  91                 return;
  92         }
  93
  94         if (!cli_session_setup(&cli, "", "", 1, "", 0, workgroup)) {
  95                 cli_shutdown(&cli);
  96                 return;
  97         }
  98
  99         if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
 100                 cli_shutdown(&cli);
 101                 return;
 102         }
 103
 104         /* All the cli_XX functions take UNIX character set. */
 105         fstrcpy(unix_workgroup, cli.server_domain?cli.server_domain:workgroup);
 106
 107         /* Fetch a workgroup list. */
 108         cli_NetServerEnum(&cli, unix_workgroup,
 109                           local_type|SV_TYPE_DOMAIN_ENUM,
 110                           callback, NULL);
 111
 112         /* Now fetch a server list. */
 113         if (servers) {
 114                 fstrcpy(unix_workgroup, workgroup);
 115                 cli_NetServerEnum(&cli, unix_workgroup,
 116                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
 117                                   callback, NULL);
 118         }
 119
 120         cli_shutdown(&cli);
 121 }
 122
 123
 124 /*******************************************************************
 125   initialise a browse sync with another browse server.  Log in on the
 126   remote server's SMB port to their IPC$ service, do a NetServerEnum
 127   and record the results
 128 ******************************************************************/
 129 void sync_browse_lists(struct work_record *work,
 130                        char *name, int nm_type,
 131                        struct in_addr ip, BOOL local, BOOL servers)
 132 {
 133         struct sync_record *s;
 134         static int counter;
 135
 136         START_PROFILE(sync_browse_lists);
 137         /* Check we're not trying to sync with ourselves. This can
 138            happen if we are a domain *and* a local master browser. */
 139         if (ismyip(ip)) {
 140 done:
 141                 END_PROFILE(sync_browse_lists);
 142                 return;
 143         }
 144
 145         s = (struct sync_record *)malloc(sizeof(*s));
 146         if (!s) goto done;
 147
 148         ZERO_STRUCTP(s);
 149
 150         fstrcpy(s->workgroup, work->work_group);
 151         fstrcpy(s->server, name);
 152         s->ip = ip;
 153
 154         slprintf(s->fname, sizeof(pstring)-1,
 155                  "%s/sync.%d", lp_lockdir(), counter++);
 156         all_string_sub(s->fname,"//", "/", 0);
 157
 158         DLIST_ADD(syncs, s);
 159
 160         /* the parent forks and returns, leaving the child to do the
 161            actual sync and call END_PROFILE*/
 162         CatchChild();
 163         if ((s->pid = sys_fork())) return;
 164
 165         BlockSignals( False, SIGTERM );
 166
 167         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
 168                  work->work_group, name, inet_ntoa(ip)));
 169
 170         fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644);
 171         if (!fp) {
 172                 END_PROFILE(sync_browse_lists);
 173                 _exit(1);
 174         }
 175
 176         sync_child(name, nm_type, work->work_group, ip, local, servers,
 177                    s->fname);
 178
 179         x_fclose(fp);
 180         END_PROFILE(sync_browse_lists);
 181         _exit(0);
 182 }
 183
 184 /**********************************************************************
 185 handle one line from a completed sync file
 186  **********************************************************************/
 187 static void complete_one(struct sync_record *s,
 188                          char *sname, uint32 stype, char *comment)
 189 {
 190         struct work_record *work;
 191         struct server_record *servrec;
 192
 193         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 194
 195         if (stype & SV_TYPE_DOMAIN_ENUM) {
 196                 /* See if we can find the workgroup on this subnet. */
 197                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
 198                         /* We already know about this workgroup -
 199                            update the ttl. */
 200                         update_workgroup_ttl(work,lp_max_ttl());
 201                 } else {
 202                         /* Create the workgroup on the subnet. */
 203                         work = create_workgroup_on_subnet(unicast_subnet,
 204                                                           sname, lp_max_ttl());
 205                         if (work) {
 206                                 /* remember who the master is */
 207                                 fstrcpy(work->local_master_browser_name,
 208                                         comment);
 209                         }
 210                 }
 211                 return;
 212         }
 213
 214         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
 215         if (!work) {
 216                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
 217                          s->workgroup));
 218                 return;
 219         }
 220
 221         if ((servrec = find_server_in_workgroup( work, sname))) {
 222                 /* Check that this is not a locally known
 223                    server - if so ignore the entry. */
 224                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
 225                         /* We already know about this server - update
 226                            the ttl. */
 227                         update_server_ttl(servrec, lp_max_ttl());
 228                         /* Update the type. */
 229                         servrec->serv.type = stype;
 230                 }
 231                 return;
 232         }
 233
 234         /* Create the server in the workgroup. */
 235         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
 236 }
 237
 238
 239 /**********************************************************************
 240 read the completed sync info
 241  **********************************************************************/
 242 static void complete_sync(struct sync_record *s)
 243 {
 244         XFILE *f;
 245         fstring server, type_str;
 246         unsigned type;
 247         pstring comment;
 248         pstring line;
 249         const char *ptr;
 250         int count=0;
 251
 252         f = x_fopen(s->fname,O_RDONLY, 0);
 253
 254         if (!f) return;
 255
 256         while (!x_feof(f)) {
 257
 258                 if (!fgets_slash(line,sizeof(pstring),f)) continue;
 259
 260                 ptr = line;
 261
 262                 if (!next_token(&ptr,server,NULL,sizeof(server)) ||
 263                     !next_token(&ptr,type_str,NULL, sizeof(type_str)) ||
 264                     !next_token(&ptr,comment,NULL, sizeof(comment))) {
 265                         continue;
 266                 }
 267
 268                 sscanf(type_str, "%X", &type);
 269
 270                 complete_one(s, server, type, comment);
 271
 272                 count++;
 273         }
 274
 275         x_fclose(f);
 276
 277         unlink(s->fname);
 278
 279         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
 280                  s->server, inet_ntoa(s->ip), s->workgroup, count));
 281 }
 282
 283 /**********************************************************************
 284 check for completion of any of the child processes
 285  **********************************************************************/
 286 void sync_check_completion(void)
 287 {
 288         struct sync_record *s, *next;
 289
 290         for (s=syncs;s;s=next) {
 291                 next = s->next;
 292                 if (!process_exists(s->pid)) {
 293                         /* it has completed - grab the info */
 294                         complete_sync(s);
 295                         DLIST_REMOVE(syncs, s);
 296                         ZERO_STRUCTP(s);
 297                         SAFE_FREE(s);
 298                 }
 299         }
 300 }