/* Unix SMB/CIFS implementation. 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 3 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, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "../librpc/gen_ndr/svcctl.h" #include "nmbd/nmbd.h" int updatecount = 0; /******************************************************************* Remove all the servers in a work group. ******************************************************************/ void remove_all_servers(struct work_record *work) { struct server_record *servrec; struct server_record *nexts; for (servrec = work->serverlist; servrec; servrec = nexts) { DEBUG(7,("remove_all_servers: Removing server %s\n",servrec->serv.name)); nexts = servrec->next; DLIST_REMOVE(work->serverlist, servrec); ZERO_STRUCTP(servrec); SAFE_FREE(servrec); } work->subnet->work_changed = True; } /*************************************************************************** Add a server into the a workgroup serverlist. **************************************************************************/ static void add_server_to_workgroup(struct work_record *work, struct server_record *servrec) { DLIST_ADD_END(work->serverlist, servrec, struct server_record *); work->subnet->work_changed = True; } /**************************************************************************** Find a server in a server list. **************************************************************************/ struct server_record *find_server_in_workgroup(struct work_record *work, const char *name) { struct server_record *ret; for (ret = work->serverlist; ret; ret = ret->next) { if (strequal(ret->serv.name,name)) return ret; } return NULL; } /**************************************************************************** Remove a server entry from this workgroup. ****************************************************************************/ void remove_server_from_workgroup(struct work_record *work, struct server_record *servrec) { DLIST_REMOVE(work->serverlist, servrec); ZERO_STRUCTP(servrec); SAFE_FREE(servrec); work->subnet->work_changed = True; } /**************************************************************************** Create a server entry on this workgroup. ****************************************************************************/ struct server_record *create_server_on_workgroup(struct work_record *work, const char *name,int servertype, int ttl, const char *comment) { struct server_record *servrec; if (name[0] == '*') { DEBUG(7,("create_server_on_workgroup: not adding name starting with '*' (%s)\n", name)); return (NULL); } if(find_server_in_workgroup(work, name) != NULL) { DEBUG(0,("create_server_on_workgroup: Server %s already exists on \ workgroup %s. This is a bug.\n", name, work->work_group)); return NULL; } if((servrec = SMB_MALLOC_P(struct server_record)) == NULL) { DEBUG(0,("create_server_entry_on_workgroup: malloc fail !\n")); return NULL; } memset((char *)servrec,'\0',sizeof(*servrec)); servrec->subnet = work->subnet; fstrcpy(servrec->serv.name,name); fstrcpy(servrec->serv.comment,comment); strupper_m(servrec->serv.name); servrec->serv.type = servertype; update_server_ttl(servrec, ttl); add_server_to_workgroup(work, servrec); DEBUG(3,("create_server_on_workgroup: Created server entry %s of type %x (%s) on \ workgroup %s.\n", name,servertype,comment, work->work_group)); work->subnet->work_changed = True; return(servrec); } /******************************************************************* Update the ttl field of a server record. *******************************************************************/ void update_server_ttl(struct server_record *servrec, int ttl) { if(ttl > lp_max_ttl()) ttl = lp_max_ttl(); if(is_myname(servrec->serv.name)) servrec->death_time = PERMANENT_TTL; else servrec->death_time = (ttl != PERMANENT_TTL) ? time(NULL)+(ttl*3) : PERMANENT_TTL; servrec->subnet->work_changed = True; } /******************************************************************* Expire old servers in the serverlist. A time of -1 indicates everybody dies except those with a death_time of PERMANENT_TTL (which is 0). This should only be called from expire_workgroups_and_servers(). ******************************************************************/ void expire_servers(struct work_record *work, time_t t) { struct server_record *servrec; struct server_record *nexts; for (servrec = work->serverlist; servrec; servrec = nexts) { nexts = servrec->next; if ((servrec->death_time != PERMANENT_TTL) && ((t == -1) || (servrec->death_time < t))) { DEBUG(3,("expire_old_servers: Removing timed out server %s\n",servrec->serv.name)); remove_server_from_workgroup(work, servrec); work->subnet->work_changed = True; } } } /******************************************************************* Decide if we should write out a server record for this server. We return zero if we should not. Check if we've already written out this server record from an earlier subnet. ******************************************************************/ static uint32 write_this_server_name( struct subnet_record *subrec, struct work_record *work, struct server_record *servrec) { struct subnet_record *ssub; struct work_record *iwork; /* Go through all the subnets we have already seen. */ for (ssub = FIRST_SUBNET; ssub && (ssub != subrec); ssub = NEXT_SUBNET_INCLUDING_UNICAST(ssub)) { for(iwork = ssub->workgrouplist; iwork; iwork = iwork->next) { if(find_server_in_workgroup( iwork, servrec->serv.name) != NULL) { /* * We have already written out this server record, don't * do it again. This gives precedence to servers we have seen * on the broadcast subnets over servers that may have been * added via a sync on the unicast_subet. * * The correct way to do this is to have a serverlist file * per subnet - this means changes to smbd as well. I may * add this at a later date (JRA). */ return 0; } } } return servrec->serv.type; } /******************************************************************* Decide if we should write out a workgroup record for this workgroup. We return zero if we should not. Don't write out lp_workgroup() (we've already done it) and also don't write out a second workgroup record on the unicast subnet that we've already written out on one of the broadcast subnets. ******************************************************************/ static uint32 write_this_workgroup_name( struct subnet_record *subrec, struct work_record *work) { struct subnet_record *ssub; if(strequal(lp_workgroup(), work->work_group)) return 0; /* This is a workgroup we have seen on a broadcast subnet. All these have the same type. */ if(subrec != unicast_subnet) return (SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT|SV_TYPE_LOCAL_LIST_ONLY); for(ssub = FIRST_SUBNET; ssub; ssub = NEXT_SUBNET_EXCLUDING_UNICAST(ssub)) { /* This is the unicast subnet so check if we've already written out this subnet when we passed over the broadcast subnets. */ if(find_workgroup_on_subnet( ssub, work->work_group) != NULL) return 0; } /* All workgroups on the unicast subnet (except our own, which we have already written out) cannot be local. */ return (SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT); } /******************************************************************* Write out the browse.dat file. ******************************************************************/ void write_browse_list_entry(XFILE *fp, const char *name, uint32 rec_type, const char *local_master_browser_name, const char *description) { fstring tmp; slprintf(tmp,sizeof(tmp)-1, "\"%s\"", name); x_fprintf(fp, "%-25s ", tmp); x_fprintf(fp, "%08x ", rec_type); slprintf(tmp, sizeof(tmp)-1, "\"%s\" ", local_master_browser_name); x_fprintf(fp, "%-30s", tmp); x_fprintf(fp, "\"%s\"\n", description); } void write_browse_list(time_t t, bool force_write) { struct subnet_record *subrec; struct work_record *work; struct server_record *servrec; char *fname; char *fnamenew; uint32 stype; int i; XFILE *fp; bool list_changed = force_write; static time_t lasttime = 0; TALLOC_CTX *ctx = talloc_tos(); /* Always dump if we're being told to by a signal. */ if(force_write == False) { if (!lasttime) lasttime = t; if (t - lasttime < 5) return; } lasttime = t; dump_workgroups(force_write); for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) { if(subrec->work_changed) { list_changed = True; break; } } if(!list_changed) return; updatecount++; fname = cache_path(SERVER_LIST); if (!fname) { return; } fnamenew = talloc_asprintf(ctx, "%s.", fname); if (!fnamenew) { return; } fp = x_fopen(fnamenew,O_WRONLY|O_CREAT|O_TRUNC, 0644); if (!fp) { DEBUG(0,("write_browse_list: Can't open file %s. Error was %s\n", fnamenew,strerror(errno))); return; } /* * Write out a record for our workgroup. Use the record from the first * subnet. */ if((work = find_workgroup_on_subnet(FIRST_SUBNET, lp_workgroup())) == NULL) { DEBUG(0,("write_browse_list: Fatal error - cannot find my workgroup %s\n", lp_workgroup())); x_fclose(fp); return; } write_browse_list_entry(fp, work->work_group, SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT|SV_TYPE_LOCAL_LIST_ONLY, work->local_master_browser_name, work->work_group); /* * We need to do something special for our own names. * This is due to the fact that we may be a local master browser on * one of our broadcast subnets, and a domain master on the unicast * subnet. We iterate over the subnets and only write out the name * once. */ for (i=0; my_netbios_names(i); i++) { stype = 0; for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) { if((work = find_workgroup_on_subnet( subrec, lp_workgroup() )) == NULL) continue; if((servrec = find_server_in_workgroup( work, my_netbios_names(i))) == NULL) continue; stype |= servrec->serv.type; } /* Output server details, plus what workgroup they're in. */ write_browse_list_entry(fp, my_netbios_names(i), stype, string_truncate(lp_serverstring(), MAX_SERVER_STRING_LENGTH), lp_workgroup()); } for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) { subrec->work_changed = False; for (work = subrec->workgrouplist; work ; work = work->next) { /* Write out a workgroup record for a workgroup. */ uint32 wg_type = write_this_workgroup_name( subrec, work); if(wg_type) { write_browse_list_entry(fp, work->work_group, wg_type, work->local_master_browser_name, work->work_group); } /* Now write out any server records a workgroup may have. */ for (servrec = work->serverlist; servrec ; servrec = servrec->next) { uint32 serv_type; /* We have already written our names here. */ if(is_myname(servrec->serv.name)) continue; serv_type = write_this_server_name(subrec, work, servrec); if(serv_type) { /* Output server details, plus what workgroup they're in. */ write_browse_list_entry(fp, servrec->serv.name, serv_type, servrec->serv.comment, work->work_group); } } } } x_fclose(fp); unlink(fname); chmod(fnamenew,0644); rename(fnamenew,fname); DEBUG(3,("write_browse_list: Wrote browse list into file %s\n",fname)); }