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 32extern fstring local_machine; 33 34struct sync_record { 35 struct sync_record *next, *prev; 36 unstring workgroup; 37 unstring server; 38 pstring fname; 39 struct in_addr ip; 40 pid_t pid; 41}; 42 43/* a linked list of current sync connections */ 44static struct sync_record *syncs; 45 46static XFILE *fp; 47 48/******************************************************************* 49 This is the NetServerEnum callback. 50 Note sname and comment are in UNIX codepage format. 51 ******************************************************************/ 52 53static void callback(const char *sname, uint32 stype, 54 const char *comment, void *state) 55{ 56 x_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 65static 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 fstring unix_workgroup; 71 struct cli_state *cli; 72 uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0; 73 struct nmb_name called, calling; 74 75 /* W2K DMB's return empty browse lists on port 445. Use 139. 76 * Patch from Andy Levine andyl@epicrealm.com. 77 */ 78 79 cli = cli_initialise(); 80 if (!cli) { 81 return; 82 } 83 84 if (!cli_set_port(cli, 139) || !cli_connect(cli, name, &ip)) { 85 return; 86 } 87 88 make_nmb_name(&calling, local_machine, 0x0); 89 make_nmb_name(&called , name, nm_type); 90 91 if (!cli_session_request(cli, &calling, &called)) { 92 cli_shutdown(cli); 93 return; 94 } 95 96 if (!cli_negprot(cli)) { 97 cli_shutdown(cli); 98 return; 99 } 100 101 if (!NT_STATUS_IS_OK(cli_session_setup(cli, "", "", 1, "", 0, 102 workgroup))) { 103 cli_shutdown(cli); 104 return; 105 } 106 107 if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) { 108 cli_shutdown(cli); 109 return; 110 } 111 112 /* All the cli_XX functions take UNIX character set. */ 113 fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup); 114 115 /* Fetch a workgroup list. */ 116 cli_NetServerEnum(cli, unix_workgroup, 117 local_type|SV_TYPE_DOMAIN_ENUM, 118 callback, NULL); 119 120 /* Now fetch a server list. */ 121 if (servers) { 122 fstrcpy(unix_workgroup, workgroup); 123 cli_NetServerEnum(cli, unix_workgroup, 124 local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL, 125 callback, NULL); 126 } 127 128 cli_shutdown(cli); 129} 130 131/******************************************************************* 132 initialise a browse sync with another browse server. Log in on the 133 remote server's SMB port to their IPC$ service, do a NetServerEnum 134 and record the results 135******************************************************************/ 136 137void sync_browse_lists(struct work_record *work, 138 char *name, int nm_type, 139 struct in_addr ip, BOOL local, BOOL servers) 140{ 141 struct sync_record *s; 142 static int counter; 143 144 START_PROFILE(sync_browse_lists); 145 /* Check we're not trying to sync with ourselves. This can 146 happen if we are a domain *and* a local master browser. */ 147 if (ismyip(ip)) { 148done: 149 END_PROFILE(sync_browse_lists); 150 return; 151 } 152 153 s = SMB_MALLOC_P(struct sync_record); 154 if (!s) goto done; 155 156 ZERO_STRUCTP(s); 157 158 unstrcpy(s->workgroup, work->work_group); 159 unstrcpy(s->server, name); 160 s->ip = ip; 161 162 slprintf(s->fname, sizeof(pstring)-1, 163 "%s/sync.%d", lp_lockdir(), counter++); 164 all_string_sub(s->fname,"//", "/", 0); 165 166 DLIST_ADD(syncs, s); 167 168 /* the parent forks and returns, leaving the child to do the 169 actual sync and call END_PROFILE*/ 170 CatchChild(); 171 if ((s->pid = sys_fork())) return; 172 173 BlockSignals( False, SIGTERM ); 174 175 DEBUG(2,("Initiating browse sync for %s to %s(%s)\n", 176 work->work_group, name, inet_ntoa(ip))); 177 178 fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644); 179 if (!fp) { 180 END_PROFILE(sync_browse_lists); 181 _exit(1); 182 } 183 184 sync_child(name, nm_type, work->work_group, ip, local, servers, 185 s->fname); 186 187 x_fclose(fp); 188 END_PROFILE(sync_browse_lists); 189 _exit(0); 190} 191 192/********************************************************************** 193 Handle one line from a completed sync file. 194 **********************************************************************/ 195 196static void complete_one(struct sync_record *s, 197 char *sname, uint32 stype, char *comment) 198{ 199 struct work_record *work; 200 struct server_record *servrec; 201 202 stype &= ~SV_TYPE_LOCAL_LIST_ONLY; 203 204 if (stype & SV_TYPE_DOMAIN_ENUM) { 205 /* See if we can find the workgroup on this subnet. */ 206 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) { 207 /* We already know about this workgroup - 208 update the ttl. */ 209 update_workgroup_ttl(work,lp_max_ttl()); 210 } else { 211 /* Create the workgroup on the subnet. */ 212 work = create_workgroup_on_subnet(unicast_subnet, 213 sname, lp_max_ttl()); 214 if (work) { 215 /* remember who the master is */ 216 unstrcpy(work->local_master_browser_name, comment); 217 } 218 } 219 return; 220 } 221 222 work = find_workgroup_on_subnet(unicast_subnet, s->workgroup); 223 if (!work) { 224 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n", 225 s->workgroup)); 226 return; 227 } 228 229 if ((servrec = find_server_in_workgroup( work, sname))) { 230 /* Check that this is not a locally known 231 server - if so ignore the entry. */ 232 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) { 233 /* We already know about this server - update 234 the ttl. */ 235 update_server_ttl(servrec, lp_max_ttl()); 236 /* Update the type. */ 237 servrec->serv.type = stype; 238 } 239 return; 240 } 241 242 /* Create the server in the workgroup. */ 243 create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment); 244} 245 246/********************************************************************** 247 Read the completed sync info. 248**********************************************************************/ 249 250static void complete_sync(struct sync_record *s) 251{ 252 XFILE *f; 253 unstring server, type_str; 254 unsigned type; 255 pstring comment; 256 pstring line; 257 const char *ptr; 258 int count=0; 259 260 f = x_fopen(s->fname,O_RDONLY, 0); 261 262 if (!f) 263 return; 264 265 while (!x_feof(f)) { 266 267 if (!fgets_slash(line,sizeof(pstring),f)) 268 continue; 269 270 ptr = line; 271 272 if (!next_token(&ptr,server,NULL,sizeof(server)) || 273 !next_token(&ptr,type_str,NULL, sizeof(type_str)) || 274 !next_token(&ptr,comment,NULL, sizeof(comment))) { 275 continue; 276 } 277 278 sscanf(type_str, "%X", &type); 279 280 complete_one(s, server, type, comment); 281 282 count++; 283 } 284 285 x_fclose(f); 286 287 unlink(s->fname); 288 289 DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n", 290 s->server, inet_ntoa(s->ip), s->workgroup, count)); 291} 292 293/********************************************************************** 294 Check for completion of any of the child processes. 295**********************************************************************/ 296 297void sync_check_completion(void) 298{ 299 struct sync_record *s, *next; 300 301 for (s=syncs;s;s=next) { 302 next = s->next; 303 if (!process_exists_by_pid(s->pid)) { 304 /* it has completed - grab the info */ 305 complete_sync(s); 306 DLIST_REMOVE(syncs, s); 307 ZERO_STRUCTP(s); 308 SAFE_FREE(s); 309 } 310 } 311} 312