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/*
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/>.
*/
/* 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 "system/filesys.h"
#include "../librpc/gen_ndr/svcctl.h"
#include "nmbd/nmbd.h"
#include "libsmb/libsmb.h"
#include "libsmb/clirap.h"
#include "smbprofile.h"
struct sync_record {
struct sync_record *next, *prev;
unstring workgroup;
unstring server;
char *fname;
struct in_addr ip;
pid_t pid;
};
/* a linked list of current sync connections */
static struct sync_record *syncs;
static XFILE *fp;
/*******************************************************************
This is the NetServerEnum callback.
Note sname and comment are in UNIX codepage format.
******************************************************************/
static void callback(const char *sname, uint32 stype,
const char *comment, void *state)
{
x_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)
{
fstring unix_workgroup;
struct cli_state *cli;
uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
struct nmb_name called, calling;
struct sockaddr_storage ss;
NTSTATUS status;
/* W2K DMB's return empty browse lists on port 445. Use 139.
* Patch from Andy Levine andyl@epicrealm.com.
*/
cli = cli_initialise();
if (!cli) {
return;
}
cli_set_port(cli, 139);
in_addr_to_sockaddr_storage(&ss, ip);
status = cli_connect(cli, name, &ss);
if (!NT_STATUS_IS_OK(status)) {
cli_shutdown(cli);
return;
}
make_nmb_name(&calling, get_local_machine_name(), 0x0);
make_nmb_name(&called , name, nm_type);
if (!cli_session_request(cli, &calling, &called)) {
cli_shutdown(cli);
return;
}
status = cli_negprot(cli);
if (!NT_STATUS_IS_OK(status)) {
cli_shutdown(cli);
return;
}
if (!NT_STATUS_IS_OK(cli_session_setup(cli, "", "", 1, "", 0,
workgroup))) {
cli_shutdown(cli);
return;
}
if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", "", 1))) {
cli_shutdown(cli);
return;
}
/* All the cli_XX functions take UNIX character set. */
fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup);
/* Fetch a workgroup list. */
cli_NetServerEnum(cli, unix_workgroup,
local_type|SV_TYPE_DOMAIN_ENUM,
callback, NULL);
/* Now fetch a server list. */
if (servers) {
fstrcpy(unix_workgroup, workgroup);
cli_NetServerEnum(cli, unix_workgroup,
local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
callback, NULL);
}
cli_shutdown(cli);
}
/*******************************************************************
initialise a browse sync with another browse server. Log in on the
remote server's SMB port to their IPC$ 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;
START_PROFILE(sync_browse_lists);
/* Check we're not trying to sync with ourselves. This can
happen if we are a domain *and* a local master browser. */
if (ismyip_v4(ip)) {
done:
END_PROFILE(sync_browse_lists);
return;
}
s = SMB_MALLOC_P(struct sync_record);
if (!s) goto done;
ZERO_STRUCTP(s);
unstrcpy(s->workgroup, work->work_group);
unstrcpy(s->server, name);
s->ip = ip;
if (asprintf(&s->fname, "%s/sync.%d", lp_lockdir(), counter++) < 0) {
SAFE_FREE(s);
goto done;
}
/* Safe to use as 0 means no size change. */
all_string_sub(s->fname,"//", "/", 0);
DLIST_ADD(syncs, s);
/* the parent forks and returns, leaving the child to do the
actual sync and call END_PROFILE*/
CatchChild();
if ((s->pid = sys_fork())) return;
BlockSignals( False, SIGTERM );
DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
work->work_group, name, inet_ntoa(ip)));
fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644);
if (!fp) {
END_PROFILE(sync_browse_lists);
_exit(1);
}
sync_child(name, nm_type, work->work_group, ip, local, servers,
s->fname);
x_fclose(fp);
END_PROFILE(sync_browse_lists);
_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 */
unstrcpy(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)
{
XFILE *f;
char *server;
char *type_str;
unsigned type;
char *comment;
char line[1024];
const char *ptr;
int count=0;
f = x_fopen(s->fname,O_RDONLY, 0);
if (!f)
return;
while (!x_feof(f)) {
TALLOC_CTX *frame = NULL;
if (!fgets_slash(line,sizeof(line),f))
continue;
ptr = line;
frame = talloc_stackframe();
if (!next_token_talloc(frame,&ptr,&server,NULL) ||
!next_token_talloc(frame,&ptr,&type_str,NULL) ||
!next_token_talloc(frame,&ptr,&comment,NULL)) {
TALLOC_FREE(frame);
continue;
}
sscanf(type_str, "%X", &type);
complete_one(s, server, type, comment);
count++;
TALLOC_FREE(frame);
}
x_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_by_pid(s->pid)) {
/* it has completed - grab the info */
complete_sync(s);
DLIST_REMOVE(syncs, s);
SAFE_FREE(s->fname);
SAFE_FREE(s);
}
}
}
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