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 32struct sync_record { 33 struct sync_record *next, *prev; 34 nstring workgroup; 35 nstring server; 36 pstring fname; 37 struct in_addr ip; 38 pid_t pid; 39}; 40 41/* a linked list of current sync connections */ 42static struct sync_record *syncs; 43 44static XFILE *fp; 45 46/******************************************************************* 47 This is the NetServerEnum callback. 48 Note sname and comment are in UNIX codepage format. 49 ******************************************************************/ 50 51static void callback(const char *sname, uint32 stype, 52 const char *comment, void *state) 53{ 54 x_fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment); 55} 56 57/******************************************************************* 58 Synchronise browse lists with another browse server. 59 Log in on the remote server's SMB port to their IPC$ service, 60 do a NetServerEnum and record the results in fname 61******************************************************************/ 62 63static void sync_child(char *name, int nm_type, 64 char *workgroup, 65 struct in_addr ip, BOOL local, BOOL servers, 66 char *fname) 67{ 68 extern fstring local_machine; 69 fstring unix_workgroup; 70 static struct cli_state cli; 71 uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0; 72 struct nmb_name called, calling; 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 if (!cli_initialise(&cli) || !cli_set_port(&cli, 139) || !cli_connect(&cli, name, &ip)) { 79 return; 80 } 81 82 make_nmb_name(&calling, local_machine, 0x0); 83 make_nmb_name(&called , name, nm_type); 84 85 if (!cli_session_request(&cli, &calling, &called)) { 86 cli_shutdown(&cli); 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$", "IPC", "", 1)) { 101 cli_shutdown(&cli); 102 return; 103 } 104 105 /* All the cli_XX functions take UNIX character set. */ 106 fstrcpy(unix_workgroup, cli.server_domain?cli.server_domain:workgroup); 107 108 /* Fetch a workgroup list. */ 109 cli_NetServerEnum(&cli, unix_workgroup, 110 local_type|SV_TYPE_DOMAIN_ENUM, 111 callback, NULL); 112 113 /* Now fetch a server list. */ 114 if (servers) { 115 fstrcpy(unix_workgroup, workgroup); 116 cli_NetServerEnum(&cli, unix_workgroup, 117 local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL, 118 callback, NULL); 119 } 120 121 cli_shutdown(&cli); 122} 123 124/******************************************************************* 125 initialise a browse sync with another browse server. Log in on the 126 remote server's SMB port to their IPC$ service, do a NetServerEnum 127 and record the results 128******************************************************************/ 129 130void sync_browse_lists(struct work_record *work, 131 char *name, int nm_type, 132 struct in_addr ip, BOOL local, BOOL servers) 133{ 134 struct sync_record *s; 135 static int counter; 136 137 START_PROFILE(sync_browse_lists); 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)) { 141done: 142 END_PROFILE(sync_browse_lists); 143 return; 144 } 145 146 s = (struct sync_record *)malloc(sizeof(*s)); 147 if (!s) goto done; 148 149 ZERO_STRUCTP(s); 150 151 nstrcpy(s->workgroup, work->work_group); 152 nstrcpy(s->server, name); 153 s->ip = ip; 154 155 slprintf(s->fname, sizeof(pstring)-1, 156 "%s/sync.%d", lp_lockdir(), counter++); 157 all_string_sub(s->fname,"//", "/", 0); 158 159 DLIST_ADD(syncs, s); 160 161 /* the parent forks and returns, leaving the child to do the 162 actual sync and call END_PROFILE*/ 163 CatchChild(); 164 if ((s->pid = sys_fork())) return; 165 166 BlockSignals( False, SIGTERM ); 167 168 DEBUG(2,("Initiating browse sync for %s to %s(%s)\n", 169 work->work_group, name, inet_ntoa(ip))); 170 171 fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644); 172 if (!fp) { 173 END_PROFILE(sync_browse_lists); 174 _exit(1); 175 } 176 177 sync_child(name, nm_type, work->work_group, ip, local, servers, 178 s->fname); 179 180 x_fclose(fp); 181 END_PROFILE(sync_browse_lists); 182 _exit(0); 183} 184 185/********************************************************************** 186 Handle one line from a completed sync file. 187 **********************************************************************/ 188 189static void complete_one(struct sync_record *s, 190 char *sname, uint32 stype, char *comment) 191{ 192 struct work_record *work; 193 struct server_record *servrec; 194 195 stype &= ~SV_TYPE_LOCAL_LIST_ONLY; 196 197 if (stype & SV_TYPE_DOMAIN_ENUM) { 198 /* See if we can find the workgroup on this subnet. */ 199 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) { 200 /* We already know about this workgroup - 201 update the ttl. */ 202 update_workgroup_ttl(work,lp_max_ttl()); 203 } else { 204 /* Create the workgroup on the subnet. */ 205 work = create_workgroup_on_subnet(unicast_subnet, 206 sname, lp_max_ttl()); 207 if (work) { 208 /* remember who the master is */ 209 nstrcpy(work->local_master_browser_name, comment); 210 } 211 } 212 return; 213 } 214 215 work = find_workgroup_on_subnet(unicast_subnet, s->workgroup); 216 if (!work) { 217 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n", 218 s->workgroup)); 219 return; 220 } 221 222 if ((servrec = find_server_in_workgroup( work, sname))) { 223 /* Check that this is not a locally known 224 server - if so ignore the entry. */ 225 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) { 226 /* We already know about this server - update 227 the ttl. */ 228 update_server_ttl(servrec, lp_max_ttl()); 229 /* Update the type. */ 230 servrec->serv.type = stype; 231 } 232 return; 233 } 234 235 /* Create the server in the workgroup. */ 236 create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment); 237} 238 239/********************************************************************** 240 Read the completed sync info. 241**********************************************************************/ 242 243static void complete_sync(struct sync_record *s) 244{ 245 XFILE *f; 246 fstring server, type_str; 247 unsigned type; 248 pstring comment; 249 pstring line; 250 const char *ptr; 251 int count=0; 252 253 f = x_fopen(s->fname,O_RDONLY, 0); 254 255 if (!f) 256 return; 257 258 while (!x_feof(f)) { 259 260 if (!fgets_slash(line,sizeof(pstring),f)) 261 continue; 262 263 ptr = line; 264 265 if (!next_token(&ptr,server,NULL,sizeof(server)) || 266 !next_token(&ptr,type_str,NULL, sizeof(type_str)) || 267 !next_token(&ptr,comment,NULL, sizeof(comment))) { 268 continue; 269 } 270 271 sscanf(type_str, "%X", &type); 272 273 complete_one(s, server, type, comment); 274 275 count++; 276 } 277 278 x_fclose(f); 279 280 unlink(s->fname); 281 282 DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n", 283 s->server, inet_ntoa(s->ip), s->workgroup, count)); 284} 285 286/********************************************************************** 287 Check for completion of any of the child processes. 288**********************************************************************/ 289 290void sync_check_completion(void) 291{ 292 struct sync_record *s, *next; 293 294 for (s=syncs;s;s=next) { 295 next = s->next; 296 if (!process_exists(s->pid)) { 297 /* it has completed - grab the info */ 298 complete_sync(s); 299 DLIST_REMOVE(syncs, s); 300 ZERO_STRUCTP(s); 301 SAFE_FREE(s); 302 } 303 } 304} 305