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samba-mirror/source3/nmbd/nmbd_synclists.c

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/*
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;
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(char *sname, uint32 stype, 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;
if (!cli_initialise(&cli) || !cli_connect(&cli, name, &ip)) {
fclose(fp);
return;
}
if (!cli_session_request(&cli, name, nm_type, local_machine)) {
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;
DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
work->work_group, name, inet_ntoa(ip)));
fp = 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 = fopen(s->fname,"r");
while (!feof(f)) {
if (!fgets_slash(line,sizeof(pstring),f)) continue;
ptr = line;
DEBUG(9,("sync line [%s]\n", line));
if (!next_token(&ptr,server,NULL) ||
!next_token(&ptr,type_str,NULL) ||
!next_token(&ptr,comment,NULL)) {
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);
}
}
}