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/*
Unix SMB/Netbios implementation.
Version 1.9.
NBT netbios routines and daemon - version 2
Copyright (C) Andrew Tridgell 1994-1997
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.
Module name: namedbname.c
Revision History:
14 jan 96: lkcl@pires.co.uk
added multiple workgroup domain master support
04 jul 96: lkcl@pires.co.uk
created module namedbname containing name database functions
*/
#include "includes.h"
extern int DEBUGLEVEL;
extern pstring scope;
extern struct in_addr ipzero;
extern struct in_addr wins_ip;
extern BOOL updatedlists;
extern struct subnet_record *subnetlist;
#define WINS_LIST "wins.dat"
uint16 nb_type = 0; /* samba's NetBIOS name type */
/****************************************************************************
samba's NetBIOS name type
XXXX maybe functionality could be set: B, M, P or H name registration
and resolution could be set through nb_type. just a thought.
****************************************************************************/
void set_samba_nb_type(void)
{
if (lp_wins_support() || (*lp_wins_server()))
{
nb_type = NB_MFLAG; /* samba is a 'hybrid' node type */
}
else
{
nb_type = NB_BFLAG; /* samba is broadcast-only node type */
}
}
/****************************************************************************
true if two netbios names are equal
****************************************************************************/
BOOL name_equal(struct nmb_name *n1,struct nmb_name *n2)
{
return n1->name_type == n2->name_type &&
strequal(n1->name ,n2->name ) &&
strequal(n1->scope,n2->scope);
}
/****************************************************************************
true if the netbios name is ^1^2__MSBROWSE__^2^1
note: this name is registered if as a master browser or backup browser
you are responsible for a workgroup (when you announce a domain by
broadcasting on your local subnet, you announce it as coming from this
name: see announce_host()).
**************************************************************************/
BOOL ms_browser_name(char *name, int type)
{
return strequal(name,MSBROWSE) && type == 0x01;
}
/****************************************************************************
add a netbios name into the namelist
**************************************************************************/
static void add_name(struct subnet_record *d, struct name_record *n)
{
struct name_record *n2;
if (!d) return;
if (!d->namelist)
{
d->namelist = n;
n->prev = NULL;
n->next = NULL;
return;
}
for (n2 = d->namelist; n2->next; n2 = n2->next) ;
n2->next = n;
n->next = NULL;
n->prev = n2;
if((d == wins_subnet) && lp_wins_support())
updatedlists = True;
}
/****************************************************************************
remove a name from the namelist. The pointer must be an element just
retrieved
**************************************************************************/
void remove_name(struct subnet_record *d, struct name_record *n)
{
struct name_record *nlist;
if (!d) return;
nlist = d->namelist;
while (nlist && nlist != n) nlist = nlist->next;
if (nlist)
{
if (nlist->next) nlist->next->prev = nlist->prev;
if (nlist->prev) nlist->prev->next = nlist->next;
if(nlist == d->namelist)
d->namelist = nlist->next;
if(nlist->ip_flgs != NULL)
free(nlist->ip_flgs);
free(nlist);
}
if((d == wins_subnet) && lp_wins_support())
updatedlists = True;
}
/****************************************************************************
find a name in a namelist.
**************************************************************************/
struct name_record *find_name(struct name_record *n,
struct nmb_name *name, int search)
{
struct name_record *ret;
for (ret = n; ret; ret = ret->next)
{
if (name_equal(&ret->name,name))
{
/* self search: self names only */
if ((search&FIND_SELF) == FIND_SELF && ret->source != SELF)
{
continue;
}
DEBUG(9,("find_name: found name %s(%02x)\n",
name->name, name->name_type));
return ret;
}
}
DEBUG(9,("find_name: name %s(%02x) NOT FOUND\n", name->name,
name->name_type));
return NULL;
}
/****************************************************************************
find a name in the domain database namelist
search can be any of:
FIND_SELF - look exclusively for names the samba server has added for itself
FIND_LOCAL - look for names in the local subnet record.
FIND_WINS - look for names in the WINS record
**************************************************************************/
struct name_record *find_name_search(struct subnet_record **d,
struct nmb_name *name,
int search, struct in_addr ip)
{
if (d == NULL) return NULL; /* bad error! */
if (search & FIND_LOCAL) {
if (*d != NULL) {
struct name_record *n = find_name((*d)->namelist, name, search);
DEBUG(4,("find_name on local: %s %s search %x\n",
namestr(name),inet_ntoa(ip), search));
if (n) return n;
}
}
if (!(search & FIND_WINS)) return NULL;
/* find WINS subnet record. */
*d = wins_subnet;
if (*d == NULL) return NULL;
DEBUG(4,("find_name on WINS: %s %s search %x\n",
namestr(name),inet_ntoa(ip), search));
return find_name((*d)->namelist, name, search);
}
/****************************************************************************
dump a copy of the name table
**************************************************************************/
void dump_names(void)
{
struct name_record *n;
fstring fname, fnamenew;
time_t t = time(NULL);
FILE *f;
if(lp_wins_support() == False || wins_subnet == 0)
return;
fstrcpy(fname,lp_lockdir());
trim_string(fname,NULL,"/");
strcat(fname,"/");
strcat(fname,WINS_LIST);
fstrcpy(fnamenew,fname);
strcat(fnamenew,".");
f = fopen(fnamenew,"w");
if (!f)
{
DEBUG(3,("Can't open %s - %s\n",fnamenew,strerror(errno)));
return;
}
DEBUG(4,("Dump of WINS name table:\n"));
for (n = wins_subnet->namelist; n; n = n->next)
{
int i;
DEBUG(4,("%15s ", inet_ntoa(wins_subnet->bcast_ip)));
DEBUG(4,("%15s ", inet_ntoa(wins_subnet->mask_ip)));
DEBUG(4,("%-19s TTL=%ld ",
namestr(&n->name),
n->death_time?n->death_time-t:0));
for (i = 0; i < n->num_ips; i++)
{
DEBUG(4,("%15s NB=%2x source=%d",
inet_ntoa(n->ip_flgs[i].ip),
n->ip_flgs[i].nb_flags,n->source));
}
DEBUG(4,("\n"));
if (f && ((n->source == REGISTER) || (n->source == SELF)))
{
/* XXXX i have little imagination as to how to output nb_flags as
anything other than as a hexadecimal number :-) */
fprintf(f, "%s#%02x %ld ",
n->name.name,n->name.name_type, /* XXXX ignore scope for now */
n->death_time);
for (i = 0; i < n->num_ips; i++)
{
fprintf(f, "%s %2x%c ",
inet_ntoa(n->ip_flgs[i].ip),
n->ip_flgs[i].nb_flags, (n->source == REGISTER ? 'R' : 'S'));
}
fprintf(f, "\n");
}
}
fclose(f);
unlink(fname);
chmod(fnamenew,0644);
rename(fnamenew,fname);
DEBUG(3,("Wrote wins database %s\n",fname));
}
/****************************************************************************
load a netbios name database file
XXXX we cannot cope with loading Internet Group names, yet
****************************************************************************/
void load_netbios_names(void)
{
struct subnet_record *d = wins_subnet;
fstring fname;
FILE *f;
pstring line;
if (!d) return;
fstrcpy(fname,lp_lockdir());
trim_string(fname,NULL,"/");
strcat(fname,"/");
strcat(fname,WINS_LIST);
f = fopen(fname,"r");
if (!f) {
DEBUG(2,("Can't open wins database file %s\n",fname));
return;
}
while (!feof(f))
{
pstring name_str, ip_str, ttd_str, nb_flags_str;
pstring name;
int type = 0;
unsigned int nb_flags;
time_t ttd;
struct in_addr ipaddr;
enum name_source source;
char *ptr;
int count = 0;
char *p;
if (!fgets_slash(line,sizeof(pstring),f)) continue;
if (*line == '#') continue;
ptr = line;
if (next_token(&ptr,name_str ,NULL)) ++count;
if (next_token(&ptr,ttd_str ,NULL)) ++count;
if (next_token(&ptr,ip_str ,NULL)) ++count;
if (next_token(&ptr,nb_flags_str,NULL)) ++count;
if (count <= 0) continue;
if (count != 4) {
DEBUG(0,("Ill formed wins line"));
DEBUG(0,("[%s]: name#type abs_time ip nb_flags\n",line));
continue;
}
/* Deal with SELF or REGISTER name encoding. Default is REGISTER
for compatibility with old nmbds. */
if(nb_flags_str[strlen(nb_flags_str)-1] == 'S')
{
DEBUG(5,("Ignoring SELF name %s\n", line));
continue;
}
if(nb_flags_str[strlen(nb_flags_str)-1] == 'R')
nb_flags_str[strlen(nb_flags_str)-1] = '\0';
/* netbios name. # divides the name from the type (hex): netbios#xx */
pstrcpy(name,name_str);
p = strchr(name,'#');
if (p) {
*p = 0;
sscanf(p+1,"%x",&type);
}
/* decode the netbios flags (hex) and the time-to-die (seconds) */
sscanf(nb_flags_str,"%x",&nb_flags);
sscanf(ttd_str,"%ld",&ttd);
ipaddr = *interpret_addr2(ip_str);
if (ip_equal(ipaddr,ipzero)) {
source = SELF;
}
else
{
source = REGISTER;
}
DEBUG(4, ("add WINS line: %s#%02x %ld %s %2x\n",
name,type, ttd, inet_ntoa(ipaddr), nb_flags));
/* add all entries that have 60 seconds or more to live */
if (ttd - 60 > time(NULL) || ttd == 0)
{
time_t t = (ttd?ttd-time(NULL):0) / 3;
/* add netbios entry read from the wins.dat file. IF it's ok */
add_netbios_entry(d,name,type,nb_flags,t,source,ipaddr,True,True);
}
}
fclose(f);
}
/****************************************************************************
remove an entry from the name list
****************************************************************************/
void remove_netbios_name(struct subnet_record *d,
char *name,int type, enum name_source source,
struct in_addr ip)
{
struct nmb_name nn;
struct name_record *n;
make_nmb_name(&nn, name, type, scope);
n = find_name_search(&d, &nn, FIND_LOCAL, ip);
if (n && n->source == source) remove_name(d,n);
}
/****************************************************************************
add an entry to the name list.
this is a multi-purpose function.
it adds samba's own names in to its records on each interface, keeping a
record of whether it is a master browser, domain master, or WINS server.
it also keeps a record of WINS entries.
****************************************************************************/
struct name_record *add_netbios_entry(struct subnet_record *d,
char *name, int type, int nb_flags,
int ttl, enum name_source source, struct in_addr ip,
BOOL new_only,BOOL wins)
{
struct name_record *n;
struct name_record *n2=NULL;
struct subnet_record *found_subnet = 0;
int search = 0;
BOOL self = (source == SELF);
/* add the name to the WINS list if the name comes from a directed query */
search |= wins ? FIND_WINS : FIND_LOCAL;
/* If it's a local search then we need to set the subnet
we are looking at. */
if(search & FIND_LOCAL)
found_subnet = d;
/* search for SELF names only */
search |= self ? FIND_SELF : 0;
if (!self)
{
if (!wins && (type != 0x1b))
{
/* the only broadcast (non-WINS) names we are adding are ours
(SELF) and Domain Master type names */
return NULL;
}
if(wins && (type == 0x1d))
{
/* Do not allow any 0x1d names to be registered in a WINS,
database although we return success for them.
*/
return NULL;
}
}
n = (struct name_record *)malloc(sizeof(*n));
if (!n) return(NULL);
bzero((char *)n,sizeof(*n));
n->num_ips = 1; /* XXXX ONLY USE THIS FUNCTION FOR ONE ENTRY */
n->ip_flgs = (struct nmb_ip*)malloc(sizeof(*n->ip_flgs) * n->num_ips);
if (!n->ip_flgs)
{
free(n);
return NULL;
}
bzero((char *)n->ip_flgs, sizeof(*n->ip_flgs) * n->num_ips);
make_nmb_name(&n->name,name,type,scope);
if ((n2 = find_name_search(&found_subnet, &n->name, search, new_only?ipzero:ip)))
{
free(n->ip_flgs);
free(n);
if (new_only || (n2->source==SELF && source!=SELF)) return n2;
n = n2;
d = found_subnet;
}
if (ttl)
n->death_time = time(NULL)+ttl*3;
n->refresh_time = time(NULL)+GET_TTL(ttl);
/* XXXX only one entry expected with this function */
n->ip_flgs[0].ip = ip;
n->ip_flgs[0].nb_flags = nb_flags;
n->source = source;
if (!n2) add_name(d,n);
DEBUG(3,("Added netbios name %s at %s ttl=%d nb_flags=%2x to interface %s\n",
namestr(&n->name),inet_ntoa(ip),ttl,nb_flags,
ip_equal(d->bcast_ip, wins_ip) ? "WINS" : (char *)inet_ntoa(d->bcast_ip)));
return(n);
}
/*******************************************************************
expires old names in the namelist
******************************************************************/
void expire_names(time_t t)
{
struct name_record *n;
struct name_record *next;
struct subnet_record *d;
/* expire old names */
for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_INCLUDING_WINS(d))
{
for (n = d->namelist; n; n = next)
{
next = n->next;
if (n->death_time && n->death_time < t)
{
if (n->source == SELF)
{
DEBUG(3,("not expiring SELF name %s\n", namestr(&n->name)));
n->death_time += 300;
continue;
}
DEBUG(3,("Removing dead name %s\n", namestr(&n->name)));
if (n->prev) n->prev->next = n->next;
if (n->next) n->next->prev = n->prev;
if (d->namelist == n) d->namelist = n->next;
if(n->ip_flgs != NULL)
free(n->ip_flgs);
free(n);
}
}
}
}
/***************************************************************************
assume a WINS name is a dns name, and do a gethostbyname() on it.
****************************************************************************/
struct name_record *dns_name_search(struct nmb_name *question, int Time)
{
int name_type = question->name_type;
char *qname = question->name;
BOOL dns_type = (name_type == 0x20 || name_type == 0);
struct in_addr dns_ip;
if (wins_subnet == NULL)
return NULL;
DEBUG(3,("Search for %s - ", namestr(question)));
/* only do DNS lookups if the query is for type 0x20 or type 0x0 */
if (!dns_type)
{
DEBUG(3,("types 0x20 0x0 only: name not found\n"));
return NULL;
}
/* look it up with DNS */
dns_ip.s_addr = interpret_addr(qname);
if (!dns_ip.s_addr)
{
/* no luck with DNS. We could possibly recurse here XXXX */
DEBUG(3,("not found. no recursion.\n"));
/* add the fail to WINS cache of names. give it 1 hour in the cache */
add_netbios_entry(wins_subnet,qname,name_type,NB_ACTIVE,60*60,DNSFAIL,dns_ip,
True, True);
return NULL;
}
DEBUG(3,("found with DNS: %s\n", inet_ntoa(dns_ip)));
/* add it to our WINS cache of names. give it 2 hours in the cache */
return add_netbios_entry(wins_subnet,qname,name_type,NB_ACTIVE,2*60*60,DNS,dns_ip,
True,True);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.