source3/nmbd/nmbd_synclists.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    NBT netbios routines and daemon - version 2
   5    Copyright (C) Andrew Tridgell 1994-1998
   6    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   7    Copyright (C) Jeremy Allison 1994-1998
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22
  23 */
  24
  25 /* this file handles asynchronous browse synchronisation requests. The
  26    requests are done by forking and putting the result in a file in the
  27    locks directory. We do it this way because we don't want nmbd to be
  28    blocked waiting for some server to respond on a TCP connection. This
  29    also allows us to have more than 1 sync going at once (tridge) */
  30
  31 #include "includes.h"
  32 #include "smb.h"
  33
  34 extern int DEBUGLEVEL;
  35
  36 struct sync_record {
  37         struct sync_record *next, *prev;
  38         fstring workgroup;
  39         fstring server;
  40         pstring fname;
  41         struct in_addr ip;
  42         pid_t pid;
  43 };
  44
  45 /* a linked list of current sync connections */
  46 static struct sync_record *syncs;
  47
  48 static FILE *fp;
  49
  50 /*******************************************************************
  51   This is the NetServerEnum callback.
  52   Note sname and comment are in UNIX codepage format.
  53   ******************************************************************/
  54 static void callback(const char *sname, uint32 stype,
  55                      const char *comment, void *state)
  56 {
  57         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 static void sync_child(char *name, int nm_type,
  66                        char *workgroup,
  67                        struct in_addr ip, BOOL local, BOOL servers,
  68                        char *fname)
  69 {
  70         extern fstring local_machine;
  71         fstring unix_workgroup;
  72         static struct cli_state cli;
  73         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
  74         struct nmb_name called, calling;
  75
  76         if (!cli_initialise(&cli) || !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$", "IPC", "", 1)) {
 100                 cli_shutdown(&cli);
 101                 return;
 102         }
 103
 104         /* All the cli_XX functions take UNIX character set. */
 105         fstrcpy(unix_workgroup, cli.server_domain?cli.server_domain:workgroup);
 106         dos_to_unix(unix_workgroup, True);
 107
 108         /* Fetch a workgroup list. */
 109         cli_NetServerEnum(&cli, unix_workgroup,
 110                           local_type|SV_TYPE_DOMAIN_ENUM,
 111                           callback, NULL);
 112
 113         /* Now fetch a server list. */
 114         if (servers) {
 115                 fstrcpy(unix_workgroup, workgroup);
 116                 dos_to_unix(unix_workgroup, True);
 117                 cli_NetServerEnum(&cli, unix_workgroup,
 118                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
 119                                   callback, NULL);
 120         }
 121
 122         cli_shutdown(&cli);
 123 }
 124
 125
 126 /*******************************************************************
 127   initialise a browse sync with another browse server.  Log in on the
 128   remote server's SMB port to their IPC$ service, do a NetServerEnum
 129   and record the results
 130 ******************************************************************/
 131 void sync_browse_lists(struct work_record *work,
 132                        char *name, int nm_type,
 133                        struct in_addr ip, BOOL local, BOOL servers)
 134 {
 135         struct sync_record *s;
 136         static int counter;
 137
 138         /* Check we're not trying to sync with ourselves. This can
 139            happen if we are a domain *and* a local master browser. */
 140         if (ismyip(ip)) {
 141                 return;
 142         }
 143
 144         s = (struct sync_record *)malloc(sizeof(*s));
 145         if (!s) return;
 146
 147         ZERO_STRUCTP(s);
 148
 149         fstrcpy(s->workgroup, work->work_group);
 150         fstrcpy(s->server, name);
 151         s->ip = ip;
 152
 153         slprintf(s->fname, sizeof(pstring)-1,
 154                  "%s/sync.%d", lp_lockdir(), counter++);
 155         all_string_sub(s->fname,"//", "/", 0);
 156
 157         DLIST_ADD(syncs, s);
 158
 159         /* the parent forks and returns, leaving the child to do the
 160            actual sync */
 161         CatchChild();
 162         if ((s->pid = sys_fork())) return;
 163
 164         BlockSignals( False, SIGTERM );
 165
 166         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
 167                  work->work_group, name, inet_ntoa(ip)));
 168
 169         fp = sys_fopen(s->fname,"w");
 170         if (!fp) _exit(1);
 171
 172         sync_child(name, nm_type, work->work_group, ip, local, servers,
 173                    s->fname);
 174
 175         fclose(fp);
 176         _exit(0);
 177 }
 178
 179 /**********************************************************************
 180 handle one line from a completed sync file
 181  **********************************************************************/
 182 static void complete_one(struct sync_record *s,
 183                          char *sname, uint32 stype, char *comment)
 184 {
 185         struct work_record *work;
 186         struct server_record *servrec;
 187
 188         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 189
 190         if (stype & SV_TYPE_DOMAIN_ENUM) {
 191                 /* See if we can find the workgroup on this subnet. */
 192                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
 193                         /* We already know about this workgroup -
 194                            update the ttl. */
 195                         update_workgroup_ttl(work,lp_max_ttl());
 196                 } else {
 197                         /* Create the workgroup on the subnet. */
 198                         work = create_workgroup_on_subnet(unicast_subnet,
 199                                                           sname, lp_max_ttl());
 200                         if (work) {
 201                                 /* remember who the master is */
 202                                 fstrcpy(work->local_master_browser_name,
 203                                         comment);
 204                         }
 205                 }
 206                 return;
 207         }
 208
 209         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
 210         if (!work) {
 211                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
 212                          s->workgroup));
 213                 return;
 214         }
 215
 216         if ((servrec = find_server_in_workgroup( work, sname))) {
 217                 /* Check that this is not a locally known
 218                    server - if so ignore the entry. */
 219                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
 220                         /* We already know about this server - update
 221                            the ttl. */
 222                         update_server_ttl(servrec, lp_max_ttl());
 223                         /* Update the type. */
 224                         servrec->serv.type = stype;
 225                 }
 226                 return;
 227         }
 228
 229         /* Create the server in the workgroup. */
 230         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
 231 }
 232
 233
 234 /**********************************************************************
 235 read the completed sync info
 236  **********************************************************************/
 237 static void complete_sync(struct sync_record *s)
 238 {
 239         FILE *f;
 240         fstring server, type_str;
 241         unsigned type;
 242         pstring comment;
 243         pstring line;
 244         char *ptr;
 245         int count=0;
 246
 247         f = sys_fopen(s->fname,"r");
 248
 249         if (!f) return;
 250
 251         while (!feof(f)) {
 252
 253                 if (!fgets_slash(line,sizeof(pstring),f)) continue;
 254
 255                 ptr = line;
 256
 257                 /* The line is written in UNIX character set. Convert to DOS codepage. */
 258                 unix_to_dos(line,True);
 259
 260                 if (!next_token(&ptr,server,NULL,sizeof(server)) ||
 261                     !next_token(&ptr,type_str,NULL, sizeof(type_str)) ||
 262                     !next_token(&ptr,comment,NULL, sizeof(comment))) {
 263                         continue;
 264                 }
 265
 266                 sscanf(type_str, "%X", &type);
 267
 268                 complete_one(s, server, type, comment);
 269
 270                 count++;
 271         }
 272
 273         fclose(f);
 274
 275         unlink(s->fname);
 276
 277         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
 278                  s->server, inet_ntoa(s->ip), s->workgroup, count));
 279 }
 280
 281 /**********************************************************************
 282 check for completion of any of the child processes
 283  **********************************************************************/
 284 void sync_check_completion(void)
 285 {
 286         struct sync_record *s, *next;
 287
 288         for (s=syncs;s;s=next) {
 289                 next = s->next;
 290                 if (!process_exists(s->pid)) {
 291                         /* it has completed - grab the info */
 292                         complete_sync(s);
 293                         DLIST_REMOVE(syncs, s);
 294                         ZERO_STRUCTP(s);
 295                         free(s);
 296                 }
 297         }
 298 }