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 31struct sync_record { 32 struct sync_record *next, *prev; 33 unstring workgroup; 34 unstring server; 35 char *fname; 36 struct in_addr ip; 37 pid_t pid; 38}; 39 40/* a linked list of current sync connections */ 41static struct sync_record *syncs; 42 43static XFILE *fp; 44 45/******************************************************************* 46 This is the NetServerEnum callback. 47 Note sname and comment are in UNIX codepage format. 48 ******************************************************************/ 49 50static 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 62static void sync_child(char *name, int nm_type, 63 char *workgroup, 64 struct in_addr ip, bool local, bool servers, 65 char *fname) 66{ 67 fstring unix_workgroup; 68 struct cli_state *cli; 69 uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0; 70 struct nmb_name called, calling; 71 struct sockaddr_storage ss; 72 NTSTATUS status; 73 74 /* W2K DMB's return empty browse lists on port 445. Use 139. 75 * Patch from Andy Levine andyl@epicrealm.com. 76 */ 77 78 cli = cli_initialise(); 79 if (!cli) { 80 return; 81 } 82 83 cli_set_port(cli, 139); 84 85 in_addr_to_sockaddr_storage(&ss, ip); 86 status = cli_connect(cli, name, &ss); 87 if (!NT_STATUS_IS_OK(status)) { 88 cli_shutdown(cli); 89 return; 90 } 91 92 make_nmb_name(&calling, get_local_machine_name(), 0x0); 93 make_nmb_name(&called , name, nm_type); 94 95 if (!cli_session_request(cli, &calling, &called)) { 96 cli_shutdown(cli); 97 return; 98 } 99 100 status = cli_negprot(cli); 101 if (!NT_STATUS_IS_OK(status)) { 102 cli_shutdown(cli); 103 return; 104 } 105 106 if (!NT_STATUS_IS_OK(cli_session_setup(cli, "", "", 1, "", 0, 107 workgroup))) { 108 cli_shutdown(cli); 109 return; 110 } 111 112 if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", "", 1))) { 113 cli_shutdown(cli); 114 return; 115 } 116 117 /* All the cli_XX functions take UNIX character set. */ 118 fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup); 119 120 /* Fetch a workgroup list. */ 121 cli_NetServerEnum(cli, unix_workgroup, 122 local_type|SV_TYPE_DOMAIN_ENUM, 123 callback, NULL); 124 125 /* Now fetch a server list. */ 126 if (servers) { 127 fstrcpy(unix_workgroup, workgroup); 128 cli_NetServerEnum(cli, unix_workgroup, 129 local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL, 130 callback, NULL); 131 } 132 133 cli_shutdown(cli); 134} 135 136/******************************************************************* 137 initialise a browse sync with another browse server. Log in on the 138 remote server's SMB port to their IPC$ service, do a NetServerEnum 139 and record the results 140******************************************************************/ 141 142void sync_browse_lists(struct work_record *work, 143 char *name, int nm_type, 144 struct in_addr ip, bool local, bool servers) 145{ 146 struct sync_record *s; 147 static int counter; 148 149 START_PROFILE(sync_browse_lists); 150 /* Check we're not trying to sync with ourselves. This can 151 happen if we are a domain *and* a local master browser. */ 152 if (ismyip_v4(ip)) { 153done: 154 END_PROFILE(sync_browse_lists); 155 return; 156 } 157 158 s = SMB_MALLOC_P(struct sync_record); 159 if (!s) goto done; 160 161 ZERO_STRUCTP(s); 162 163 unstrcpy(s->workgroup, work->work_group); 164 unstrcpy(s->server, name); 165 s->ip = ip; 166 167 if (asprintf(&s->fname, "%s/sync.%d", lp_lockdir(), counter++) < 0) { 168 SAFE_FREE(s); 169 goto done; 170 } 171 /* Safe to use as 0 means no size change. */ 172 all_string_sub(s->fname,"//", "/", 0); 173 174 DLIST_ADD(syncs, s); 175 176 /* the parent forks and returns, leaving the child to do the 177 actual sync and call END_PROFILE*/ 178 CatchChild(); 179 if ((s->pid = sys_fork())) return; 180 181 BlockSignals( False, SIGTERM ); 182 183 DEBUG(2,("Initiating browse sync for %s to %s(%s)\n", 184 work->work_group, name, inet_ntoa(ip))); 185 186 fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644); 187 if (!fp) { 188 END_PROFILE(sync_browse_lists); 189 _exit(1); 190 } 191 192 sync_child(name, nm_type, work->work_group, ip, local, servers, 193 s->fname); 194 195 x_fclose(fp); 196 END_PROFILE(sync_browse_lists); 197 _exit(0); 198} 199 200/********************************************************************** 201 Handle one line from a completed sync file. 202 **********************************************************************/ 203 204static void complete_one(struct sync_record *s, 205 char *sname, uint32 stype, char *comment) 206{ 207 struct work_record *work; 208 struct server_record *servrec; 209 210 stype &= ~SV_TYPE_LOCAL_LIST_ONLY; 211 212 if (stype & SV_TYPE_DOMAIN_ENUM) { 213 /* See if we can find the workgroup on this subnet. */ 214 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) { 215 /* We already know about this workgroup - 216 update the ttl. */ 217 update_workgroup_ttl(work,lp_max_ttl()); 218 } else { 219 /* Create the workgroup on the subnet. */ 220 work = create_workgroup_on_subnet(unicast_subnet, 221 sname, lp_max_ttl()); 222 if (work) { 223 /* remember who the master is */ 224 unstrcpy(work->local_master_browser_name, comment); 225 } 226 } 227 return; 228 } 229 230 work = find_workgroup_on_subnet(unicast_subnet, s->workgroup); 231 if (!work) { 232 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n", 233 s->workgroup)); 234 return; 235 } 236 237 if ((servrec = find_server_in_workgroup( work, sname))) { 238 /* Check that this is not a locally known 239 server - if so ignore the entry. */ 240 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) { 241 /* We already know about this server - update 242 the ttl. */ 243 update_server_ttl(servrec, lp_max_ttl()); 244 /* Update the type. */ 245 servrec->serv.type = stype; 246 } 247 return; 248 } 249 250 /* Create the server in the workgroup. */ 251 create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment); 252} 253 254/********************************************************************** 255 Read the completed sync info. 256**********************************************************************/ 257 258static void complete_sync(struct sync_record *s) 259{ 260 XFILE *f; 261 char *server; 262 char *type_str; 263 unsigned type; 264 char *comment; 265 char line[1024]; 266 const char *ptr; 267 int count=0; 268 269 f = x_fopen(s->fname,O_RDONLY, 0); 270 271 if (!f) 272 return; 273 274 while (!x_feof(f)) { 275 TALLOC_CTX *frame = NULL; 276 277 if (!fgets_slash(line,sizeof(line),f)) 278 continue; 279 280 ptr = line; 281 282 frame = talloc_stackframe(); 283 if (!next_token_talloc(frame,&ptr,&server,NULL) || 284 !next_token_talloc(frame,&ptr,&type_str,NULL) || 285 !next_token_talloc(frame,&ptr,&comment,NULL)) { 286 TALLOC_FREE(frame); 287 continue; 288 } 289 290 sscanf(type_str, "%X", &type); 291 292 complete_one(s, server, type, comment); 293 294 count++; 295 TALLOC_FREE(frame); 296 } 297 x_fclose(f); 298 299 unlink(s->fname); 300 301 DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n", 302 s->server, inet_ntoa(s->ip), s->workgroup, count)); 303} 304 305/********************************************************************** 306 Check for completion of any of the child processes. 307**********************************************************************/ 308 309void sync_check_completion(void) 310{ 311 struct sync_record *s, *next; 312 313 for (s=syncs;s;s=next) { 314 next = s->next; 315 if (!process_exists_by_pid(s->pid)) { 316 /* it has completed - grab the info */ 317 complete_sync(s); 318 DLIST_REMOVE(syncs, s); 319 SAFE_FREE(s->fname); 320 SAFE_FREE(s); 321 } 322 } 323} 324