/* Unix SMB/Netbios implementation. Version 1.9. NBT netbios routines and daemon - version 2 Copyright (C) Andrew Tridgell 1994-1998 Copyright (C) Luke Kenneth Casson Leighton 1994-1998 Copyright (C) Jeremy Allison 1994-1998 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* this file handles asynchronous browse synchronisation requests. The requests are done by forking and putting the result in a file in the locks directory. We do it this way because we don't want nmbd to be blocked waiting for some server to respond on a TCP connection. This also allows us to have more than 1 sync going at once (tridge) */ #include "includes.h" #include "smb.h" extern int DEBUGLEVEL; extern pstring scope; struct sync_record { struct sync_record *next, *prev; fstring workgroup; fstring server; pstring fname; struct in_addr ip; int pid; }; /* a linked list of current sync connections */ static struct sync_record *syncs; static FILE *fp; /******************************************************************* This is the NetServerEnum callback. ******************************************************************/ static void callback(const char *sname, uint32 stype, const char *comment) { fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment); } /******************************************************************* Synchronise browse lists with another browse server. Log in on the remote server's SMB port to their IPC$ service, do a NetServerEnum and record the results in fname ******************************************************************/ static void sync_child(char *name, int nm_type, char *workgroup, struct in_addr ip, BOOL local, BOOL servers, char *fname) { extern fstring local_machine; static struct cli_state cli; uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0; struct nmb_name called, calling; if (!cli_initialise(&cli) || !cli_connect(&cli, name, &ip)) { fclose(fp); return; } make_nmb_name(&calling, local_machine, 0x0 , scope); make_nmb_name(&called , name , nm_type, scope); if (!cli_session_request(&cli, &calling, &called)) { cli_shutdown(&cli); fclose(fp); return; } if (!cli_negprot(&cli)) { cli_shutdown(&cli); return; } if (!cli_session_setup(&cli, "", "", 1, "", 0, workgroup)) { cli_shutdown(&cli); return; } if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) { cli_shutdown(&cli); return; } /* Fetch a workgroup list. */ cli_NetServerEnum(&cli, workgroup, local_type|SV_TYPE_DOMAIN_ENUM, callback); /* Now fetch a server list. */ if (servers) { cli_NetServerEnum(&cli, workgroup, local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL, callback); } cli_shutdown(&cli); } /******************************************************************* initialise a browse sync with another browse server. Log in on the remote server's SMB port to their IPC$ service, do a NetServerEnum and record the results ******************************************************************/ void sync_browse_lists(struct work_record *work, char *name, int nm_type, struct in_addr ip, BOOL local, BOOL servers) { struct sync_record *s; static int counter; /* Check we're not trying to sync with ourselves. This can happen if we are a domain *and* a local master browser. */ if (ismyip(ip)) { return; } s = (struct sync_record *)malloc(sizeof(*s)); if (!s) return; ZERO_STRUCTP(s); fstrcpy(s->workgroup, work->work_group); fstrcpy(s->server, name); s->ip = ip; slprintf(s->fname, sizeof(pstring)-1, "%s/sync.%d", lp_lockdir(), counter++); string_sub(s->fname,"//", "/"); DLIST_ADD(syncs, s); /* the parent forks and returns, leaving the child to do the actual sync */ CatchChild(); if ((s->pid = fork())) return; BlockSignals( False, SIGTERM ); DEBUG(2,("Initiating browse sync for %s to %s(%s)\n", work->work_group, name, inet_ntoa(ip))); fp = sys_fopen(s->fname,"w"); if (!fp) _exit(1); sync_child(name, nm_type, work->work_group, ip, local, servers, s->fname); fclose(fp); _exit(0); } /********************************************************************** handle one line from a completed sync file **********************************************************************/ static void complete_one(struct sync_record *s, char *sname, uint32 stype, char *comment) { struct work_record *work; struct server_record *servrec; stype &= ~SV_TYPE_LOCAL_LIST_ONLY; if (stype & SV_TYPE_DOMAIN_ENUM) { /* See if we can find the workgroup on this subnet. */ if((work=find_workgroup_on_subnet(unicast_subnet, sname))) { /* We already know about this workgroup - update the ttl. */ update_workgroup_ttl(work,lp_max_ttl()); } else { /* Create the workgroup on the subnet. */ work = create_workgroup_on_subnet(unicast_subnet, sname, lp_max_ttl()); if (work) { /* remember who the master is */ fstrcpy(work->local_master_browser_name, comment); } } return; } work = find_workgroup_on_subnet(unicast_subnet, s->workgroup); if (!work) { DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n", s->workgroup)); return; } if ((servrec = find_server_in_workgroup( work, sname))) { /* Check that this is not a locally known server - if so ignore the entry. */ if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) { /* We already know about this server - update the ttl. */ update_server_ttl(servrec, lp_max_ttl()); /* Update the type. */ servrec->serv.type = stype; } return; } /* Create the server in the workgroup. */ create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment); } /********************************************************************** read the completed sync info **********************************************************************/ static void complete_sync(struct sync_record *s) { FILE *f; fstring server, type_str; unsigned type; pstring comment; pstring line; char *ptr; int count=0; f = sys_fopen(s->fname,"r"); if (!f) return; while (!feof(f)) { if (!fgets_slash(line,sizeof(pstring),f)) continue; ptr = line; if (!next_token(&ptr,server,NULL,sizeof(server)) || !next_token(&ptr,type_str,NULL, sizeof(type_str)) || !next_token(&ptr,comment,NULL, sizeof(comment))) { continue; } sscanf(type_str, "%X", &type); complete_one(s, server, type, comment); count++; } fclose(f); unlink(s->fname); DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n", s->server, inet_ntoa(s->ip), s->workgroup, count)); } /********************************************************************** check for completion of any of the child processes **********************************************************************/ void sync_check_completion(void) { struct sync_record *s, *next; for (s=syncs;s;s=next) { next = s->next; if (!process_exists(s->pid)) { /* it has completed - grab the info */ complete_sync(s); DLIST_REMOVE(syncs, s); ZERO_STRUCTP(s); free(s); } } }