source/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, const char *comment)
  55 {
  56         fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
  57 }
  58
  59 /*******************************************************************
  60   Synchronise browse lists with another browse server.
  61   Log in on the remote server's SMB port to their IPC$ service,
  62   do a NetServerEnum and record the results in fname
  63 ******************************************************************/
  64 static void sync_child(char *name, int nm_type,
  65                        char *workgroup,
  66                        struct in_addr ip, BOOL local, BOOL servers,
  67                        char *fname)
  68 {
  69         extern fstring local_machine;
  70         fstring unix_workgroup;
  71         static struct cli_state cli;
  72         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
  73         struct nmb_name called, calling;
  74
  75         if (!cli_initialise(&cli) || !cli_connect(&cli, name, &ip)) {
  76                 fclose(fp);
  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                 fclose(fp);
  87                 return;
  88         }
  89
  90         if (!cli_negprot(&cli)) {
  91                 cli_shutdown(&cli);
  92                 return;
  93         }
  94
  95         if (!cli_session_setup(&cli, "", "", 1, "", 0, workgroup)) {
  96                 cli_shutdown(&cli);
  97                 return;
  98         }
  99
 100         if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
 101                 cli_shutdown(&cli);
 102                 return;
 103         }
 104
 105         /* All the cli_XX functions take UNIX character set. */
 106         fstrcpy(unix_workgroup, cli.server_domain?cli.server_domain:workgroup);
 107         dos_to_unix(unix_workgroup, True);
 108
 109         /* Fetch a workgroup list. */
 110         cli_NetServerEnum(&cli, unix_workgroup,
 111                           local_type|SV_TYPE_DOMAIN_ENUM,
 112                           callback);
 113
 114         /* Now fetch a server list. */
 115         if (servers) {
 116                 fstrcpy(unix_workgroup, workgroup);
 117                 dos_to_unix(unix_workgroup, True);
 118                 cli_NetServerEnum(&cli, unix_workgroup,
 119                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
 120                                   callback);
 121         }
 122
 123         cli_shutdown(&cli);
 124 }
 125
 126
 127 /*******************************************************************
 128   initialise a browse sync with another browse server.  Log in on the
 129   remote server's SMB port to their IPC$ service, do a NetServerEnum
 130   and record the results
 131 ******************************************************************/
 132 void sync_browse_lists(struct work_record *work,
 133                        char *name, int nm_type,
 134                        struct in_addr ip, BOOL local, BOOL servers)
 135 {
 136         struct sync_record *s;
 137         static int counter;
 138
 139         /* Check we're not trying to sync with ourselves. This can
 140            happen if we are a domain *and* a local master browser. */
 141         if (ismyip(ip)) {
 142                 return;
 143         }
 144
 145         s = (struct sync_record *)malloc(sizeof(*s));
 146         if (!s) return;
 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 */
 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 = sys_fopen(s->fname,"w");
 171         if (!fp) _exit(1);
 172
 173         sync_child(name, nm_type, work->work_group, ip, local, servers,
 174                    s->fname);
 175
 176         fclose(fp);
 177         _exit(0);
 178 }
 179
 180 /**********************************************************************
 181 handle one line from a completed sync file
 182  **********************************************************************/
 183 static void complete_one(struct sync_record *s,
 184                          char *sname, uint32 stype, char *comment)
 185 {
 186         struct work_record *work;
 187         struct server_record *servrec;
 188
 189         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 190
 191         if (stype & SV_TYPE_DOMAIN_ENUM) {
 192                 /* See if we can find the workgroup on this subnet. */
 193                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
 194                         /* We already know about this workgroup -
 195                            update the ttl. */
 196                         update_workgroup_ttl(work,lp_max_ttl());
 197                 } else {
 198                         /* Create the workgroup on the subnet. */
 199                         work = create_workgroup_on_subnet(unicast_subnet,
 200                                                           sname, lp_max_ttl());
 201                         if (work) {
 202                                 /* remember who the master is */
 203                                 fstrcpy(work->local_master_browser_name,
 204                                         comment);
 205                         }
 206                 }
 207                 return;
 208         }
 209
 210         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
 211         if (!work) {
 212                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
 213                          s->workgroup));
 214                 return;
 215         }
 216
 217         if ((servrec = find_server_in_workgroup( work, sname))) {
 218                 /* Check that this is not a locally known
 219                    server - if so ignore the entry. */
 220                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
 221                         /* We already know about this server - update
 222                            the ttl. */
 223                         update_server_ttl(servrec, lp_max_ttl());
 224                         /* Update the type. */
 225                         servrec->serv.type = stype;
 226                 }
 227                 return;
 228         }
 229
 230         /* Create the server in the workgroup. */
 231         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
 232 }
 233
 234
 235 /**********************************************************************
 236 read the completed sync info
 237  **********************************************************************/
 238 static void complete_sync(struct sync_record *s)
 239 {
 240         FILE *f;
 241         fstring server, type_str;
 242         unsigned type;
 243         pstring comment;
 244         pstring line;
 245         char *ptr;
 246         int count=0;
 247
 248         f = sys_fopen(s->fname,"r");
 249
 250         if (!f) return;
 251
 252         while (!feof(f)) {
 253
 254                 if (!fgets_slash(line,sizeof(pstring),f)) continue;
 255
 256                 ptr = line;
 257
 258                 /* The line is written in UNIX character set. Convert to DOS codepage. */
 259                 unix_to_dos(line,True);
 260
 261                 if (!next_token(&ptr,server,NULL,sizeof(server)) ||
 262                     !next_token(&ptr,type_str,NULL, sizeof(type_str)) ||
 263                     !next_token(&ptr,comment,NULL, sizeof(comment))) {
 264                         continue;
 265                 }
 266
 267                 sscanf(type_str, "%X", &type);
 268
 269                 complete_one(s, server, type, comment);
 270
 271                 count++;
 272         }
 273
 274         fclose(f);
 275
 276         unlink(s->fname);
 277
 278         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
 279                  s->server, inet_ntoa(s->ip), s->workgroup, count));
 280 }
 281
 282 /**********************************************************************
 283 check for completion of any of the child processes
 284  **********************************************************************/
 285 void sync_check_completion(void)
 286 {
 287         struct sync_record *s, *next;
 288
 289         for (s=syncs;s;s=next) {
 290                 next = s->next;
 291                 if (!process_exists(s->pid)) {
 292                         /* it has completed - grab the info */
 293                         complete_sync(s);
 294                         DLIST_REMOVE(syncs, s);
 295                         ZERO_STRUCTP(s);
 296                         free(s);
 297                 }
 298         }
 299 }