/* Unix SMB/Netbios implementation. Version 1.9. NBT netbios routines and daemon - version 2 Copyright (C) Andrew Tridgell 1994-1996 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. Revision History: 14 jan 96: lkcl@pires.co.uk added multiple workgroup domain master support 04 jul 96: lkcl@pires.co.uk created module namedbsubnet containing subnet database functions */ #include "includes.h" #include "smb.h" extern int ClientNMB; extern int ClientDGRAM; extern int DEBUGLEVEL; extern struct in_addr wins_ip; extern struct in_addr ipzero; extern pstring myname; BOOL updatedlists = True; int updatecount = 0; /* local interfaces structure */ extern struct interface *local_interfaces; /* this is our domain/workgroup/server database */ struct subnet_record *subnetlist = NULL; extern uint16 nb_type; /* samba's NetBIOS name type */ /* Forward references. */ static struct subnet_record *add_subnet_entry(struct in_addr bcast_ip, struct in_addr mask_ip, char *name, BOOL add, BOOL lmhosts); /**************************************************************************** add a domain into the list **************************************************************************/ static void add_subnet(struct subnet_record *d) { struct subnet_record *d2; if (!subnetlist) { subnetlist = d; d->prev = NULL; d->next = NULL; return; } for (d2 = subnetlist; d2->next; d2 = d2->next); d2->next = d; d->next = NULL; d->prev = d2; } /**************************************************************************** find a subnet in the subnetlist **************************************************************************/ struct subnet_record *find_subnet(struct in_addr bcast_ip) { struct subnet_record *d; /* search through subnet list for broadcast/netmask that matches the source ip address. a subnet 255.255.255.255 represents the WINS list. */ for (d = subnetlist; d; d = d->next) { if (ip_equal(bcast_ip, wins_ip)) { if (ip_equal(bcast_ip, d->bcast_ip)) { return d; } } else if (same_net(bcast_ip, d->bcast_ip, d->mask_ip)) { if (!ip_equal(d->bcast_ip, wins_ip)) { return d; } } } return (NULL); } /**************************************************************************** finds the appropriate subnet structure. directed packets (non-bcast) are assumed to come from a point-to-point (P or M node), and so the subnet we return in this instance is the WINS 'pseudo-subnet' with ip 255.255.255.255 ****************************************************************************/ struct subnet_record *find_req_subnet(struct in_addr ip, BOOL bcast) { if (bcast) { /* identify the subnet the broadcast request came from */ return find_subnet(*iface_bcast(ip)); } /* find the subnet under the pseudo-ip of 255.255.255.255 */ return find_subnet(wins_ip); } /**************************************************************************** find a subnet in the subnetlist - if the subnet is not found then return the WINS subnet. **************************************************************************/ struct subnet_record *find_subnet_all(struct in_addr bcast_ip) { struct subnet_record *d = find_subnet(bcast_ip); if(!d) return find_subnet( wins_ip); } /**************************************************************************** create a domain entry ****************************************************************************/ static struct subnet_record *make_subnet(struct in_addr bcast_ip, struct in_addr mask_ip) { struct subnet_record *d; d = (struct subnet_record *)malloc(sizeof(*d)); if (!d) return(NULL); bzero((char *)d,sizeof(*d)); DEBUG(4, ("making subnet %s ", inet_ntoa(bcast_ip))); DEBUG(4, ("%s\n", inet_ntoa(mask_ip))); d->bcast_ip = bcast_ip; d->mask_ip = mask_ip; d->workgrouplist = NULL; add_subnet(d); return d; } /**************************************************************************** add the remote interfaces from lp_interfaces() to the netbios subnet database. ****************************************************************************/ void add_subnet_interfaces(void) { struct interface *i; /* loop on all local interfaces */ for (i = local_interfaces; i; i = i->next) { /* add the interface into our subnet database */ if (!find_subnet(i->bcast)) { make_subnet(i->bcast,i->nmask); } } /* add the pseudo-ip interface for WINS: 255.255.255.255 */ if (lp_wins_support() || (*lp_wins_server())) { struct in_addr wins_bcast = wins_ip; struct in_addr wins_nmask = ipzero; make_subnet(wins_bcast, wins_nmask); } } /**************************************************************************** add the default workgroup into my domain **************************************************************************/ void add_my_subnets(char *group) { struct interface *i; /* add or find domain on our local subnet, in the default workgroup */ if (*group == '*') return; /* the coding choice is up to you, andrew: i can see why you don't want global access to the local_interfaces structure: so it can't get messed up! */ for (i = local_interfaces; i; i = i->next) { add_subnet_entry(i->bcast,i->nmask,group, True, False); } } /**************************************************************************** add a domain entry. creates a workgroup, if necessary, and adds the domain to the named a workgroup. ****************************************************************************/ static struct subnet_record *add_subnet_entry(struct in_addr bcast_ip, struct in_addr mask_ip, char *name, BOOL add, BOOL lmhosts) { struct subnet_record *d; /* XXXX andrew: struct in_addr ip appears not to be referenced at all except in the DEBUG comment. i assume that the DEBUG comment below actually intends to refer to bcast_ip? i don't know. struct in_addr ip = wins_ip; */ if (zero_ip(bcast_ip)) bcast_ip = *iface_bcast(bcast_ip); /* add the domain into our domain database */ /* Note that we never add into the WINS subnet as add_subnet_entry is only called to add our local interfaces. */ if ((d = find_subnet(bcast_ip)) || (d = make_subnet(bcast_ip, mask_ip))) { struct work_record *w = find_workgroupstruct(d, name, add); if (!w) return NULL; /* add WORKGROUP(1e) and WORKGROUP(00) entries into name database or register with WINS server, if it's our workgroup */ if (strequal(lp_workgroup(), name)) { add_my_name_entry(d,name,0x1e,nb_type|NB_ACTIVE|NB_GROUP); add_my_name_entry(d,name,0x0 ,nb_type|NB_ACTIVE|NB_GROUP); } /* add samba server name to workgroup list. don't add lmhosts server entries to local interfaces */ if (strequal(lp_workgroup(), name)) { add_server_entry(d,w,myname,w->ServerType,0,lp_serverstring(),True); DEBUG(3,("Added server name entry %s at %s\n", name,inet_ntoa(bcast_ip))); } return d; } return NULL; } /******************************************************************* write out browse.dat ******************************************************************/ void write_browse_list(time_t t) { struct subnet_record *d; pstring fname,fnamenew; FILE *f; static time_t lasttime = 0; if (!lasttime) lasttime = t; if (!updatedlists || t - lasttime < 5) return; lasttime = t; updatedlists = False; updatecount++; dump_names(); dump_workgroups(); strcpy(fname,lp_lockdir()); trim_string(fname,NULL,"/"); strcat(fname,"/"); strcat(fname,SERVER_LIST); strcpy(fnamenew,fname); strcat(fnamenew,"."); f = fopen(fnamenew,"w"); if (!f) { DEBUG(4,("Can't open %s - %s\n",fnamenew,strerror(errno))); return; } for (d = subnetlist; d ; d = d->next) { struct work_record *work; for (work = d->workgrouplist; work ; work = work->next) { struct server_record *s; for (s = work->serverlist; s ; s = s->next) { fstring tmp; /* don't list domains I don't have a master for */ if ((s->serv.type & SV_TYPE_DOMAIN_ENUM) && !s->serv.comment[0]) { continue; } /* output server details, plus what workgroup/domain they're in. without the domain information, the combined list of all servers in all workgroups gets sent to anyone asking about any workgroup! */ sprintf(tmp, "\"%s\"", s->serv.name); fprintf(f, "%-25s ", tmp); fprintf(f, "%08x ", s->serv.type); sprintf(tmp, "\"%s\" ", s->serv.comment); fprintf(f, "%-30s", tmp); fprintf(f, "\"%s\"\n", work->work_group); } } } fclose(f); unlink(fname); chmod(fnamenew,0644); rename(fnamenew,fname); DEBUG(3,("Wrote browse list %s\n",fname)); }