/* 
   Unix SMB/CIFS implementation.

   Winbind daemon for ntdom nss module

   Copyright (C) Tim Potter 2000-2001
   Copyright (C) 2001 by Martin Pool <mbp@samba.org>
   
   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.
*/

#include "includes.h"
#include "winbindd.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND

/**
 * @file winbindd_util.c
 *
 * Winbind daemon for NT domain authentication nss module.
 **/


/**
 * Used to clobber name fields that have an undefined value.
 *
 * Correct code should never look at a field that has this value.
 **/

static const fstring name_deadbeef = "<deadbeef>";

/* The list of trusted domains.  Note that the list can be deleted and
   recreated using the init_domain_list() function so pointers to
   individual winbindd_domain structures cannot be made.  Keep a copy of
   the domain name instead. */

static struct winbindd_domain *_domain_list;

/**
   When was the last scan of trusted domains done?
   
   0 == not ever
*/

static time_t last_trustdom_scan;

struct winbindd_domain *domain_list(void)
{
	/* Initialise list */

	if ((!_domain_list) && (!init_domain_list())) {
		smb_panic("Init_domain_list failed\n");
	}

	return _domain_list;
}

/* Free all entries in the trusted domain list */

void free_domain_list(void)
{
	struct winbindd_domain *domain = _domain_list;

	while(domain) {
		struct winbindd_domain *next = domain->next;
		
		DLIST_REMOVE(_domain_list, domain);
		SAFE_FREE(domain);
		domain = next;
	}
}

static BOOL is_internal_domain(const DOM_SID *sid)
{
	if (sid == NULL)
		return False;

	return (sid_check_is_domain(sid) || sid_check_is_builtin(sid));
}

static BOOL is_in_internal_domain(const DOM_SID *sid)
{
	if (sid == NULL)
		return False;

	return (sid_check_is_in_our_domain(sid) || sid_check_is_in_builtin(sid));
}


/* Add a trusted domain to our list of domains */
static struct winbindd_domain *add_trusted_domain(const char *domain_name, const char *alt_name,
						  struct winbindd_methods *methods,
						  const DOM_SID *sid)
{
	struct winbindd_domain *domain;
	const char *alternative_name = NULL;
	
	/* ignore alt_name if we are not in an AD domain */
	
	if ( (lp_security() == SEC_ADS) && alt_name && *alt_name) {
		alternative_name = alt_name;
	}
        
	/* We can't call domain_list() as this function is called from
	   init_domain_list() and we'll get stuck in a loop. */
	for (domain = _domain_list; domain; domain = domain->next) {
		if (strequal(domain_name, domain->name) ||
		    strequal(domain_name, domain->alt_name)) {
			return domain;
		}
		if (alternative_name && *alternative_name) {
			if (strequal(alternative_name, domain->name) ||
			    strequal(alternative_name, domain->alt_name)) {
				return domain;
			}
		}
		if (sid) {
			if (is_null_sid(sid)) {
				
			} else if (sid_equal(sid, &domain->sid)) {
				return domain;
			}
		}
	}
        
	/* Create new domain entry */

	if ((domain = SMB_MALLOC_P(struct winbindd_domain)) == NULL)
		return NULL;

	/* Fill in fields */
        
	ZERO_STRUCTP(domain);

	/* prioritise the short name */
	if (strchr_m(domain_name, '.') && alternative_name && *alternative_name) {
		fstrcpy(domain->name, alternative_name);
		fstrcpy(domain->alt_name, domain_name);
	} else {
		fstrcpy(domain->name, domain_name);
		if (alternative_name) {
			fstrcpy(domain->alt_name, alternative_name);
		}
	}

	domain->methods = methods;
	domain->backend = NULL;
	domain->internal = is_internal_domain(sid);
	domain->sequence_number = DOM_SEQUENCE_NONE;
	domain->last_seq_check = 0;
	domain->initialized = False;
	domain->online = is_internal_domain(sid);
	if (sid) {
		sid_copy(&domain->sid, sid);
	}
	
	/* Link to domain list */
	DLIST_ADD(_domain_list, domain);
        
	DEBUG(2,("Added domain %s %s %s\n", 
		 domain->name, domain->alt_name,
		 &domain->sid?sid_string_static(&domain->sid):""));
        
	return domain;
}

/********************************************************************
  rescan our domains looking for new trusted domains
********************************************************************/

struct trustdom_state {
	TALLOC_CTX *mem_ctx;
	struct winbindd_response *response;
};

static void trustdom_recv(void *private_data, BOOL success);

static void add_trusted_domains( struct winbindd_domain *domain )
{
	TALLOC_CTX *mem_ctx;
	struct winbindd_request *request;
	struct winbindd_response *response;

	struct trustdom_state *state;

	mem_ctx = talloc_init("add_trusted_domains");
	if (mem_ctx == NULL) {
		DEBUG(0, ("talloc_init failed\n"));
		return;
	}

	request = TALLOC_ZERO_P(mem_ctx, struct winbindd_request);
	response = TALLOC_P(mem_ctx, struct winbindd_response);
	state = TALLOC_P(mem_ctx, struct trustdom_state);

	if ((request == NULL) || (response == NULL) || (state == NULL)) {
		DEBUG(0, ("talloc failed\n"));
		talloc_destroy(mem_ctx);
		return;
	}

	state->mem_ctx = mem_ctx;
	state->response = response;

	request->length = sizeof(*request);
	request->cmd = WINBINDD_LIST_TRUSTDOM;

	async_domain_request(mem_ctx, domain, request, response,
			     trustdom_recv, state);
}

static void trustdom_recv(void *private_data, BOOL success)
{
	extern struct winbindd_methods cache_methods;
	struct trustdom_state *state =
		talloc_get_type_abort(private_data, struct trustdom_state);
	struct winbindd_response *response = state->response;
	char *p;

	if ((!success) || (response->result != WINBINDD_OK)) {
		DEBUG(1, ("Could not receive trustdoms\n"));
		talloc_destroy(state->mem_ctx);
		return;
	}

	p = response->extra_data.data;

	while ((p != NULL) && (*p != '\0')) {
		char *q, *sidstr, *alt_name;
		DOM_SID sid;

		alt_name = strchr(p, '\\');
		if (alt_name == NULL) {
			DEBUG(0, ("Got invalid trustdom response\n"));
			break;
		}

		*alt_name = '\0';
		alt_name += 1;

		sidstr = strchr(alt_name, '\\');
		if (sidstr == NULL) {
			DEBUG(0, ("Got invalid trustdom response\n"));
			break;
		}

		*sidstr = '\0';
		sidstr += 1;

		q = strchr(sidstr, '\n');
		if (q != NULL)
			*q = '\0';

		if (!string_to_sid(&sid, sidstr)) {
			DEBUG(0, ("Got invalid trustdom response\n"));
			break;
		}

		if (find_domain_from_name_noinit(p) == NULL) {
			struct winbindd_domain *domain;
			char *alternate_name = NULL;
			
			/* use the real alt_name if we have one, else pass in NULL */

			if ( !strequal( alt_name, "(null)" ) )
				alternate_name = alt_name;

			domain = add_trusted_domain(p, alternate_name,
						    &cache_methods,
						    &sid);
			setup_domain_child(domain, &domain->child, NULL);
		}
		p=q;
		if (p != NULL)
			p += 1;
	}

	SAFE_FREE(response->extra_data.data);
	talloc_destroy(state->mem_ctx);
}

/********************************************************************
 Periodically we need to refresh the trusted domain cache for smbd 
********************************************************************/

void rescan_trusted_domains( void )
{
	time_t now = time(NULL);
	
	/* see if the time has come... */
	
	if ((now >= last_trustdom_scan) &&
	    ((now-last_trustdom_scan) < WINBINDD_RESCAN_FREQ) )
		return;
		
	/* this will only add new domains we didn't already know about */
	
	add_trusted_domains( find_our_domain() );

	last_trustdom_scan = now;
	
	return;	
}

struct init_child_state {
	TALLOC_CTX *mem_ctx;
	struct winbindd_domain *domain;
	struct winbindd_request *request;
	struct winbindd_response *response;
	void (*continuation)(void *private_data, BOOL success);
	void *private_data;
};

static void init_child_recv(void *private_data, BOOL success);
static void init_child_getdc_recv(void *private_data, BOOL success);

enum winbindd_result init_child_connection(struct winbindd_domain *domain,
					   void (*continuation)(void *private_data,
								BOOL success),
					   void *private_data)
{
	TALLOC_CTX *mem_ctx;
	struct winbindd_request *request;
	struct winbindd_response *response;
	struct init_child_state *state;
	struct winbindd_domain *request_domain;

	mem_ctx = talloc_init("init_child_connection");
	if (mem_ctx == NULL) {
		DEBUG(0, ("talloc_init failed\n"));
		return WINBINDD_ERROR;
	}

	request = TALLOC_ZERO_P(mem_ctx, struct winbindd_request);
	response = TALLOC_P(mem_ctx, struct winbindd_response);
	state = TALLOC_P(mem_ctx, struct init_child_state);

	if ((request == NULL) || (response == NULL) || (state == NULL)) {
		DEBUG(0, ("talloc failed\n"));
		continuation(private_data, False);
		return WINBINDD_ERROR;
	}

	request->length = sizeof(*request);

	state->mem_ctx = mem_ctx;
	state->domain = domain;
	state->request = request;
	state->response = response;
	state->continuation = continuation;
	state->private_data = private_data;

	if (IS_DC || domain->primary) {
		/* The primary domain has to find the DC name itself */
		request->cmd = WINBINDD_INIT_CONNECTION;
		fstrcpy(request->domain_name, domain->name);
		request->data.init_conn.is_primary = True;
		fstrcpy(request->data.init_conn.dcname, "");
		async_request(mem_ctx, &domain->child, request, response,
			      init_child_recv, state);
		return WINBINDD_PENDING;
	}

	/* This is *not* the primary domain, let's ask our DC about a DC
	 * name */

	request->cmd = WINBINDD_GETDCNAME;
	fstrcpy(request->domain_name, domain->name);

	/* save online flag */
	request_domain = find_our_domain();
	request_domain->online = domain->online;
	
	async_domain_request(mem_ctx, request_domain, request, response,
			     init_child_getdc_recv, state);
	return WINBINDD_PENDING;
}

static void init_child_getdc_recv(void *private_data, BOOL success)
{
	struct init_child_state *state =
		talloc_get_type_abort(private_data, struct init_child_state);
	const char *dcname = "";

	DEBUG(10, ("Received getdcname response\n"));

	if (success && (state->response->result == WINBINDD_OK)) {
		dcname = state->response->data.dc_name;
	}

	state->request->cmd = WINBINDD_INIT_CONNECTION;
	fstrcpy(state->request->domain_name, state->domain->name);
	state->request->data.init_conn.is_primary = False;
	fstrcpy(state->request->data.init_conn.dcname, dcname);

	async_request(state->mem_ctx, &state->domain->child,
		      state->request, state->response,
		      init_child_recv, state);
}

static void init_child_recv(void *private_data, BOOL success)
{
	struct init_child_state *state =
		talloc_get_type_abort(private_data, struct init_child_state);

	DEBUG(5, ("Received child initialization response for domain %s\n",
		  state->domain->name));

	if ((!success) || (state->response->result != WINBINDD_OK)) {
		DEBUG(3, ("Could not init child\n"));
		state->continuation(state->private_data, False);
		talloc_destroy(state->mem_ctx);
		return;
	}

	fstrcpy(state->domain->name,
		state->response->data.domain_info.name);
	fstrcpy(state->domain->alt_name,
		state->response->data.domain_info.alt_name);
	string_to_sid(&state->domain->sid,
		      state->response->data.domain_info.sid);
	state->domain->native_mode =
		state->response->data.domain_info.native_mode;
	state->domain->active_directory =
		state->response->data.domain_info.active_directory;
	state->domain->sequence_number =
		state->response->data.domain_info.sequence_number;

	state->domain->initialized = 1;

	if (state->continuation != NULL)
		state->continuation(state->private_data, True);
	talloc_destroy(state->mem_ctx);
}

enum winbindd_result winbindd_dual_init_connection(struct winbindd_domain *domain,
						   struct winbindd_cli_state *state)
{
	struct in_addr ipaddr;

	/* Ensure null termination */
	state->request.domain_name
		[sizeof(state->request.domain_name)-1]='\0';
	state->request.data.init_conn.dcname
		[sizeof(state->request.data.init_conn.dcname)-1]='\0';

	if (strlen(state->request.data.init_conn.dcname) > 0) {
		fstrcpy(domain->dcname, state->request.data.init_conn.dcname);
	}

	if (strlen(domain->dcname) > 0) {
		if (!resolve_name(domain->dcname, &ipaddr, 0x20)) {
			DEBUG(2, ("Could not resolve DC name %s for domain %s\n",
				  domain->dcname, domain->name));
			return WINBINDD_ERROR;
		}

		domain->dcaddr.sin_family = PF_INET;
		putip((char *)&(domain->dcaddr.sin_addr), (char *)&ipaddr);
		domain->dcaddr.sin_port = 0;
	}

	set_dc_type_and_flags(domain);

	if (!domain->initialized) {
		DEBUG(1, ("Could not initialize domain %s\n",
			  state->request.domain_name));
		return WINBINDD_ERROR;
	}

	fstrcpy(state->response.data.domain_info.name, domain->name);
	fstrcpy(state->response.data.domain_info.alt_name, domain->alt_name);
	fstrcpy(state->response.data.domain_info.sid,
		sid_string_static(&domain->sid));
	
	state->response.data.domain_info.native_mode
		= domain->native_mode;
	state->response.data.domain_info.active_directory
		= domain->active_directory;
	state->response.data.domain_info.primary
		= domain->primary;
	state->response.data.domain_info.sequence_number =
		domain->sequence_number;

	return WINBINDD_OK;
}

/* Look up global info for the winbind daemon */
BOOL init_domain_list(void)
{
	extern struct winbindd_methods cache_methods;
	extern struct winbindd_methods passdb_methods;
	struct winbindd_domain *domain;
	int role = lp_server_role();

	/* Free existing list */
	free_domain_list();

	/* Add ourselves as the first entry. */

	if ( role == ROLE_DOMAIN_MEMBER ) {
		DOM_SID our_sid;

		if (!secrets_fetch_domain_sid(lp_workgroup(), &our_sid)) {
			DEBUG(0, ("Could not fetch our SID - did we join?\n"));
			return False;
		}
	
		domain = add_trusted_domain( lp_workgroup(), lp_realm(),
					     &cache_methods, &our_sid);
		domain->primary = True;
		setup_domain_child(domain, &domain->child, NULL);
	}

	/* Local SAM */

	domain = add_trusted_domain(get_global_sam_name(), NULL,
				    &passdb_methods, get_global_sam_sid());
	if ( role != ROLE_DOMAIN_MEMBER ) {
		domain->primary = True;
	}
	setup_domain_child(domain, &domain->child, NULL);

	/* BUILTIN domain */

	domain = add_trusted_domain("BUILTIN", NULL, &passdb_methods,
				    &global_sid_Builtin);
	setup_domain_child(domain, &domain->child, NULL);

	return True;
}

/** 
 * Given a domain name, return the struct winbindd domain info for it 
 *
 * @note Do *not* pass lp_workgroup() to this function.  domain_list
 *       may modify it's value, and free that pointer.  Instead, our local
 *       domain may be found by calling find_our_domain().
 *       directly.
 *
 *
 * @return The domain structure for the named domain, if it is working.
 */

struct winbindd_domain *find_domain_from_name_noinit(const char *domain_name)
{
	struct winbindd_domain *domain;

	/* Search through list */

	for (domain = domain_list(); domain != NULL; domain = domain->next) {
		if (strequal(domain_name, domain->name) ||
		    (domain->alt_name[0] &&
		     strequal(domain_name, domain->alt_name))) {
			return domain;
		}
	}

	/* Not found */

	return NULL;
}

struct winbindd_domain *find_domain_from_name(const char *domain_name)
{
	struct winbindd_domain *domain;

	domain = find_domain_from_name_noinit(domain_name);

	if (domain == NULL)
		return NULL;

	if (!domain->initialized)
		set_dc_type_and_flags(domain);

	return domain;
}

/* Given a domain sid, return the struct winbindd domain info for it */

struct winbindd_domain *find_domain_from_sid_noinit(const DOM_SID *sid)
{
	struct winbindd_domain *domain;

	/* Search through list */

	for (domain = domain_list(); domain != NULL; domain = domain->next) {
		if (sid_compare_domain(sid, &domain->sid) == 0)
			return domain;
	}

	/* Not found */

	return NULL;
}

/* Given a domain sid, return the struct winbindd domain info for it */

struct winbindd_domain *find_domain_from_sid(const DOM_SID *sid)
{
	struct winbindd_domain *domain;

	domain = find_domain_from_sid_noinit(sid);

	if (domain == NULL)
		return NULL;

	if (!domain->initialized)
		set_dc_type_and_flags(domain);

	return domain;
}

struct winbindd_domain *find_our_domain(void)
{
	struct winbindd_domain *domain;

	/* Search through list */

	for (domain = domain_list(); domain != NULL; domain = domain->next) {
		if (domain->primary)
			return domain;
	}

	smb_panic("Could not find our domain\n");
	return NULL;
}

struct winbindd_domain *find_builtin_domain(void)
{
	DOM_SID sid;
	struct winbindd_domain *domain;

	string_to_sid(&sid, "S-1-5-32");
	domain = find_domain_from_sid(&sid);

	if (domain == NULL)
		smb_panic("Could not find BUILTIN domain\n");

	return domain;
}

/* Find the appropriate domain to lookup a name or SID */

struct winbindd_domain *find_lookup_domain_from_sid(const DOM_SID *sid)
{
	/* A DC can't ask the local smbd for remote SIDs, here winbindd is the
	 * one to contact the external DC's. On member servers the internal
	 * domains are different: These are part of the local SAM. */

	DEBUG(10, ("find_lookup_domain_from_sid(%s)\n",
		   sid_string_static(sid)));

	if (IS_DC || is_internal_domain(sid) || is_in_internal_domain(sid)) {
		DEBUG(10, ("calling find_domain_from_sid\n"));
		return find_domain_from_sid(sid);
	}

	/* On a member server a query for SID or name can always go to our
	 * primary DC. */

	DEBUG(10, ("calling find_our_domain\n"));
	return find_our_domain();
}

struct winbindd_domain *find_lookup_domain_from_name(const char *domain_name)
{
	if (IS_DC || strequal(domain_name, "BUILTIN") ||
	    strequal(domain_name, get_global_sam_name()))
		return find_domain_from_name_noinit(domain_name);

	return find_our_domain();
}

/* Lookup a sid in a domain from a name */

BOOL winbindd_lookup_sid_by_name(TALLOC_CTX *mem_ctx,
				 struct winbindd_domain *domain, 
				 const char *domain_name,
				 const char *name, DOM_SID *sid, 
				 enum SID_NAME_USE *type)
{
	NTSTATUS result;

	/* Lookup name */
	result = domain->methods->name_to_sid(domain, mem_ctx, domain_name, name, sid, type);

	/* Return rid and type if lookup successful */
	if (!NT_STATUS_IS_OK(result)) {
		*type = SID_NAME_UNKNOWN;
	}

	return NT_STATUS_IS_OK(result);
}

/**
 * @brief Lookup a name in a domain from a sid.
 *
 * @param sid Security ID you want to look up.
 * @param name On success, set to the name corresponding to @p sid.
 * @param dom_name On success, set to the 'domain name' corresponding to @p sid.
 * @param type On success, contains the type of name: alias, group or
 * user.
 * @retval True if the name exists, in which case @p name and @p type
 * are set, otherwise False.
 **/
BOOL winbindd_lookup_name_by_sid(TALLOC_CTX *mem_ctx,
				 DOM_SID *sid,
				 fstring dom_name,
				 fstring name,
				 enum SID_NAME_USE *type)
{
	char *names;
	char *dom_names;
	NTSTATUS result;
	BOOL rv = False;
	struct winbindd_domain *domain;

	domain = find_lookup_domain_from_sid(sid);

	if (!domain) {
		DEBUG(1,("Can't find domain from sid\n"));
		return False;
	}

	/* Lookup name */

	result = domain->methods->sid_to_name(domain, mem_ctx, sid, &dom_names, &names, type);

	/* Return name and type if successful */
        
	if ((rv = NT_STATUS_IS_OK(result))) {
		fstrcpy(dom_name, dom_names);
		fstrcpy(name, names);
	} else {
		*type = SID_NAME_UNKNOWN;
		fstrcpy(name, name_deadbeef);
	}
        
	return rv;
}

/* Free state information held for {set,get,end}{pw,gr}ent() functions */

void free_getent_state(struct getent_state *state)
{
	struct getent_state *temp;

	/* Iterate over state list */

	temp = state;

	while(temp != NULL) {
		struct getent_state *next;

		/* Free sam entries then list entry */

		SAFE_FREE(state->sam_entries);
		DLIST_REMOVE(state, state);
		next = temp->next;

		SAFE_FREE(temp);
		temp = next;
	}
}

/* Parse winbindd related parameters */

BOOL winbindd_param_init(void)
{
	/* Parse winbind uid and winbind_gid parameters */

	if (!lp_idmap_uid(&server_state.uid_low, &server_state.uid_high)) {
		DEBUG(0, ("winbindd: idmap uid range missing or invalid\n"));
		DEBUG(0, ("winbindd: cannot continue, exiting.\n"));
		return False;
	}
	
	if (!lp_idmap_gid(&server_state.gid_low, &server_state.gid_high)) {
		DEBUG(0, ("winbindd: idmap gid range missing or invalid\n"));
		DEBUG(0, ("winbindd: cannot continue, exiting.\n"));
		return False;
	}
	
	return True;
}

BOOL is_in_uid_range(uid_t uid)
{
	return ((uid >= server_state.uid_low) &&
		(uid <= server_state.uid_high));
}

BOOL is_in_gid_range(gid_t gid)
{
	return ((gid >= server_state.gid_low) &&
		(gid <= server_state.gid_high));
}

/* Is this a domain which we may assume no DOMAIN\ prefix? */

static BOOL assume_domain(const char *domain)
{
	/* never assume the domain on a standalone server */

	if ( lp_server_role() == ROLE_STANDALONE )
		return False;

	/* domain member servers may possibly assume for the domain name */

	if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
		if ( !strequal(lp_workgroup(), domain) )
			return False;

		if ( lp_winbind_use_default_domain() || lp_winbind_trusted_domains_only() )
			return True;
	} 

	/* only left with a domain controller */

	if ( strequal(get_global_sam_name(), domain) )  {
		return True;
	}
	
	return False;
}

/* Parse a string of the form DOMAIN\user into a domain and a user */

BOOL parse_domain_user(const char *domuser, fstring domain, fstring user)
{
	char *p = strchr(domuser,*lp_winbind_separator());

	if ( !p ) {
		fstrcpy(user, domuser);

		if ( assume_domain(lp_workgroup())) {
			fstrcpy(domain, lp_workgroup());
		} else {
			return False;
		}
	} else {
		fstrcpy(user, p+1);
		fstrcpy(domain, domuser);
		domain[PTR_DIFF(p, domuser)] = 0;
	}
	
	strupper_m(domain);
	
	return True;
}

BOOL parse_domain_user_talloc(TALLOC_CTX *mem_ctx, const char *domuser,
			      char **domain, char **user)
{
	fstring fstr_domain, fstr_user;
	if (!parse_domain_user(domuser, fstr_domain, fstr_user)) {
		return False;
	}
	*domain = talloc_strdup(mem_ctx, fstr_domain);
	*user = talloc_strdup(mem_ctx, fstr_user);
	return ((*domain != NULL) && (*user != NULL));
}

/*
    Fill DOMAIN\\USERNAME entry accounting 'winbind use default domain' and
    'winbind separator' options.
    This means:
	- omit DOMAIN when 'winbind use default domain = true' and DOMAIN is
	lp_workgroup()

    If we are a PDC or BDC, and this is for our domain, do likewise.

    Also, if omit DOMAIN if 'winbind trusted domains only = true', as the 
    username is then unqualified in unix
	 
*/
void fill_domain_username(fstring name, const char *domain, const char *user, BOOL can_assume)
{
	fstring tmp_user;

	fstrcpy(tmp_user, user);
	strlower_m(tmp_user);

	if (can_assume && assume_domain(domain)) {
		strlcpy(name, user, sizeof(fstring));
	} else {
		slprintf(name, sizeof(fstring) - 1, "%s%c%s",
			 domain, *lp_winbind_separator(),
			 tmp_user);
	}
}

/*
 * Winbindd socket accessor functions
 */

char *get_winbind_priv_pipe_dir(void) 
{
	return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
}

/* Open the winbindd socket */

static int _winbindd_socket = -1;
static int _winbindd_priv_socket = -1;

int open_winbindd_socket(void)
{
	if (_winbindd_socket == -1) {
		_winbindd_socket = create_pipe_sock(
			WINBINDD_SOCKET_DIR, WINBINDD_SOCKET_NAME, 0755);
		DEBUG(10, ("open_winbindd_socket: opened socket fd %d\n",
			   _winbindd_socket));
	}

	return _winbindd_socket;
}

int open_winbindd_priv_socket(void)
{
	if (_winbindd_priv_socket == -1) {
		_winbindd_priv_socket = create_pipe_sock(
			get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
		DEBUG(10, ("open_winbindd_priv_socket: opened socket fd %d\n",
			   _winbindd_priv_socket));
	}

	return _winbindd_priv_socket;
}

/* Close the winbindd socket */

void close_winbindd_socket(void)
{
	if (_winbindd_socket != -1) {
		DEBUG(10, ("close_winbindd_socket: closing socket fd %d\n",
			   _winbindd_socket));
		close(_winbindd_socket);
		_winbindd_socket = -1;
	}
	if (_winbindd_priv_socket != -1) {
		DEBUG(10, ("close_winbindd_socket: closing socket fd %d\n",
			   _winbindd_priv_socket));
		close(_winbindd_priv_socket);
		_winbindd_priv_socket = -1;
	}
}

/*
 * Client list accessor functions
 */

static struct winbindd_cli_state *_client_list;
static int _num_clients;

/* Return list of all connected clients */

struct winbindd_cli_state *winbindd_client_list(void)
{
	return _client_list;
}

/* Add a connection to the list */

void winbindd_add_client(struct winbindd_cli_state *cli)
{
	DLIST_ADD(_client_list, cli);
	_num_clients++;
}

/* Remove a client from the list */

void winbindd_remove_client(struct winbindd_cli_state *cli)
{
	DLIST_REMOVE(_client_list, cli);
	_num_clients--;
}

/* Close all open clients */

void winbindd_kill_all_clients(void)
{
	struct winbindd_cli_state *cl = winbindd_client_list();

	DEBUG(10, ("winbindd_kill_all_clients: going postal\n"));

	while (cl) {
		struct winbindd_cli_state *next;
		
		next = cl->next;
		winbindd_remove_client(cl);
		cl = next;
	}
}

/* Return number of open clients */

int winbindd_num_clients(void)
{
	return _num_clients;
}

/*****************************************************************************
 For idmap conversion: convert one record to new format
 Ancient versions (eg 2.2.3a) of winbindd_idmap.tdb mapped DOMAINNAME/rid
 instead of the SID.
*****************************************************************************/
static int convert_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA data, void *state)
{
	struct winbindd_domain *domain;
	char *p;
	DOM_SID sid;
	uint32 rid;
	fstring keystr;
	fstring dom_name;
	TDB_DATA key2;
	BOOL *failed = (BOOL *)state;

	DEBUG(10,("Converting %s\n", key.dptr));

	p = strchr(key.dptr, '/');
	if (!p)
		return 0;

	*p = 0;
	fstrcpy(dom_name, key.dptr);
	*p++ = '/';

	domain = find_domain_from_name(dom_name);
	if (domain == NULL) {
		/* We must delete the old record. */
		DEBUG(0,("Unable to find domain %s\n", dom_name ));
		DEBUG(0,("deleting record %s\n", key.dptr ));

		if (tdb_delete(tdb, key) != 0) {
			DEBUG(0, ("Unable to delete record %s\n", key.dptr));
			*failed = True;
			return -1;
		}

		return 0;
	}

	rid = atoi(p);

	sid_copy(&sid, &domain->sid);
	sid_append_rid(&sid, rid);

	sid_to_string(keystr, &sid);
	key2.dptr = keystr;
	key2.dsize = strlen(keystr) + 1;

	if (tdb_store(tdb, key2, data, TDB_INSERT) != 0) {
		DEBUG(0,("Unable to add record %s\n", key2.dptr ));
		*failed = True;
		return -1;
	}

	if (tdb_store(tdb, data, key2, TDB_REPLACE) != 0) {
		DEBUG(0,("Unable to update record %s\n", data.dptr ));
		*failed = True;
		return -1;
	}

	if (tdb_delete(tdb, key) != 0) {
		DEBUG(0,("Unable to delete record %s\n", key.dptr ));
		*failed = True;
		return -1;
	}

	return 0;
}

/* These definitions are from sam/idmap_tdb.c. Replicated here just
   out of laziness.... :-( */

/* High water mark keys */
#define HWM_GROUP  "GROUP HWM"
#define HWM_USER   "USER HWM"

/*****************************************************************************
 Convert the idmap database from an older version.
*****************************************************************************/

static BOOL idmap_convert(const char *idmap_name)
{
	int32 vers;
	BOOL bigendianheader;
	BOOL failed = False;
	TDB_CONTEXT *idmap_tdb;

	if (!(idmap_tdb = tdb_open_log(idmap_name, 0,
					TDB_DEFAULT, O_RDWR,
					0600))) {
		DEBUG(0, ("idmap_convert: Unable to open idmap database\n"));
		return False;
	}

	bigendianheader = (idmap_tdb->flags & TDB_BIGENDIAN) ? True : False;

	vers = tdb_fetch_int32(idmap_tdb, "IDMAP_VERSION");

	if (((vers == -1) && bigendianheader) || (IREV(vers) == IDMAP_VERSION)) {
		/* Arrggghh ! Bytereversed or old big-endian - make order independent ! */
		/*
		 * high and low records were created on a
		 * big endian machine and will need byte-reversing.
		 */

		int32 wm;

		wm = tdb_fetch_int32(idmap_tdb, HWM_USER);

		if (wm != -1) {
			wm = IREV(wm);
		}  else {
			wm = server_state.uid_low;
		}

		if (tdb_store_int32(idmap_tdb, HWM_USER, wm) == -1) {
			DEBUG(0, ("idmap_convert: Unable to byteswap user hwm in idmap database\n"));
			tdb_close(idmap_tdb);
			return False;
		}

		wm = tdb_fetch_int32(idmap_tdb, HWM_GROUP);
		if (wm != -1) {
			wm = IREV(wm);
		} else {
			wm = server_state.gid_low;
		}

		if (tdb_store_int32(idmap_tdb, HWM_GROUP, wm) == -1) {
			DEBUG(0, ("idmap_convert: Unable to byteswap group hwm in idmap database\n"));
			tdb_close(idmap_tdb);
			return False;
		}
	}

	/* the old format stored as DOMAIN/rid - now we store the SID direct */
	tdb_traverse(idmap_tdb, convert_fn, &failed);

	if (failed) {
		DEBUG(0, ("Problem during conversion\n"));
		tdb_close(idmap_tdb);
		return False;
	}

	if (tdb_store_int32(idmap_tdb, "IDMAP_VERSION", IDMAP_VERSION) == -1) {
		DEBUG(0, ("idmap_convert: Unable to dtore idmap version in databse\n"));
		tdb_close(idmap_tdb);
		return False;
	}

	tdb_close(idmap_tdb);
	return True;
}

/*****************************************************************************
 Convert the idmap database from an older version if necessary
*****************************************************************************/

BOOL winbindd_upgrade_idmap(void)
{
	pstring idmap_name;
	pstring backup_name;
	SMB_STRUCT_STAT stbuf;
	TDB_CONTEXT *idmap_tdb;

	pstrcpy(idmap_name, lock_path("winbindd_idmap.tdb"));

	if (!file_exist(idmap_name, &stbuf)) {
		/* nothing to convert return */
		return True;
	}

	if (!(idmap_tdb = tdb_open_log(idmap_name, 0,
					TDB_DEFAULT, O_RDWR,
					0600))) {
		DEBUG(0, ("idmap_convert: Unable to open idmap database\n"));
		return False;
	}

	if (tdb_fetch_int32(idmap_tdb, "IDMAP_VERSION") == IDMAP_VERSION) {
		/* nothing to convert return */
		tdb_close(idmap_tdb);
		return True;
	}

	/* backup_tdb expects the tdb not to be open */
	tdb_close(idmap_tdb);

	DEBUG(0, ("Upgrading winbindd_idmap.tdb from an old version\n"));

	pstrcpy(backup_name, idmap_name);
	pstrcat(backup_name, ".bak");

	if (backup_tdb(idmap_name, backup_name) != 0) {
		DEBUG(0, ("Could not backup idmap database\n"));
		return False;
	}

	return idmap_convert(idmap_name);
}

void winbindd_flush_nscd_cache(void)
{
#ifdef HAVE_NSCD_FLUSH_CACHE

	/* Flush nscd caches to get accurate new information */
	int ret = nscd_flush_cache("passwd");
	if (ret) {
		DEBUG(5,("failed to flush nscd cache for 'passwd' service: %s\n",
			strerror(errno)));
	}

	ret = nscd_flush_cache("group");
	if (ret) {
		DEBUG(5,("failed to flush nscd cache for 'group' service: %s\n",
			strerror(errno)));
	}
#else
	return;
#endif
}

NTSTATUS lookup_usergroups_cached(struct winbindd_domain *domain,
				  TALLOC_CTX *mem_ctx,
				  const DOM_SID *user_sid,
				  uint32 *p_num_groups, DOM_SID **user_sids)
{
	NET_USER_INFO_3 *info3 = NULL;
	NTSTATUS status = NT_STATUS_NO_MEMORY;
	int i;
	size_t num_groups = 0;
	DOM_SID group_sid, primary_group;
	
	DEBUG(3,(": lookup_usergroups_cached\n"));
	
	*user_sids = NULL;
	num_groups = 0;
	*p_num_groups = 0;

	info3 = netsamlogon_cache_get(mem_ctx, user_sid);

	if (info3 == NULL) {
		return NT_STATUS_OBJECT_NAME_NOT_FOUND;
	}

	if (info3->num_groups == 0) {
		SAFE_FREE(info3);
		return NT_STATUS_UNSUCCESSFUL;
	}
	
	/* always add the primary group to the sid array */
	sid_compose(&primary_group, &info3->dom_sid.sid, info3->user_rid);
	
	add_sid_to_array(mem_ctx, &primary_group, user_sids, &num_groups);

	for (i=0; i<info3->num_groups; i++) {
		sid_copy(&group_sid, &info3->dom_sid.sid);
		sid_append_rid(&group_sid, info3->gids[i].g_rid);

		add_sid_to_array(mem_ctx, &group_sid, user_sids,
				 &num_groups);
	}

	SAFE_FREE(info3);
	*p_num_groups = num_groups;
	status = (user_sids != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
	
	DEBUG(3,(": lookup_usergroups_cached succeeded\n"));

	return status;
}
