/* 
   Unix SMB/CIFS implementation.

   Async helpers for blocking functions

   Copyright (C) Volker Lendecke 2005
   Copyright (C) Gerald Carter 2006

   The helpers always consist of three functions: 

   * A request setup function that takes the necessary parameters together
     with a continuation function that is to be called upon completion

   * A private continuation function that is internal only. This is to be
     called by the lower-level functions in do_async(). Its only task is to
     properly call the continuation function named above.

   * A worker function that is called inside the appropriate child process.

   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/>.
*/

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

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND

struct do_async_state {
	TALLOC_CTX *mem_ctx;
	struct winbindd_request request;
	struct winbindd_response response;
	void (*cont)(TALLOC_CTX *mem_ctx,
		     bool success,
		     struct winbindd_response *response,
		     void *c, void *private_data);
	void *c, *private_data;
};

static void do_async_recv(void *private_data, bool success)
{
	struct do_async_state *state =
		talloc_get_type_abort(private_data, struct do_async_state);

	state->cont(state->mem_ctx, success, &state->response,
		    state->c, state->private_data);
}

void do_async(TALLOC_CTX *mem_ctx, struct winbindd_child *child,
	      const struct winbindd_request *request,
	      void (*cont)(TALLOC_CTX *mem_ctx, bool success,
			   struct winbindd_response *response,
			   void *c, void *private_data),
	      void *c, void *private_data)
{
	struct do_async_state *state;

	state = TALLOC_ZERO_P(mem_ctx, struct do_async_state);
	if (state == NULL) {
		DEBUG(0, ("talloc failed\n"));
		cont(mem_ctx, False, NULL, c, private_data);
		return;
	}

	state->mem_ctx = mem_ctx;
	state->request = *request;
	state->request.length = sizeof(state->request);
	state->cont = cont;
	state->c = c;
	state->private_data = private_data;

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

enum winbindd_result winbindd_dual_lookupsid(struct winbindd_domain *domain,
					     struct winbindd_cli_state *state)
{
	enum lsa_SidType type;
	DOM_SID sid;
	char *name;
	char *dom_name;

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

	DEBUG(3, ("[%5lu]: lookupsid %s\n", (unsigned long)state->pid, 
		  state->request->data.sid));

	/* Lookup sid from PDC using lsa_lookup_sids() */

	if (!string_to_sid(&sid, state->request->data.sid)) {
		DEBUG(5, ("%s not a SID\n", state->request->data.sid));
		return WINBINDD_ERROR;
	}

	/* Lookup the sid */

	if (!winbindd_lookup_name_by_sid(state->mem_ctx, domain, &sid, 
					 &dom_name, &name, &type)) 
	{
		TALLOC_FREE(dom_name);
		TALLOC_FREE(name);
		return WINBINDD_ERROR;
	}

	fstrcpy(state->response->data.name.dom_name, dom_name);
	fstrcpy(state->response->data.name.name, name);
	state->response->data.name.type = type;

	TALLOC_FREE(dom_name);
	TALLOC_FREE(name);
	return WINBINDD_OK;
}

enum winbindd_result winbindd_dual_lookupname(struct winbindd_domain *domain,
					      struct winbindd_cli_state *state)
{
	enum lsa_SidType type;
	char *name_domain, *name_user;
	DOM_SID sid;
	char *p;

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

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

	/* cope with the name being a fully qualified name */
	p = strstr(state->request->data.name.name, lp_winbind_separator());
	if (p) {
		*p = 0;
		name_domain = state->request->data.name.name;
		name_user = p+1;
	} else {
		name_domain = state->request->data.name.dom_name;
		name_user = state->request->data.name.name;
	}

	DEBUG(3, ("[%5lu]: lookupname %s%s%s\n", (unsigned long)state->pid,
		  name_domain, lp_winbind_separator(), name_user));

	/* Lookup name from DC using lsa_lookup_names() */
	if (!winbindd_lookup_sid_by_name(state->mem_ctx, state->request->original_cmd, domain, name_domain,
					 name_user, &sid, &type)) {
		return WINBINDD_ERROR;
	}

	sid_to_fstring(state->response->data.sid.sid, &sid);
	state->response->data.sid.type = type;

	return WINBINDD_OK;
}

bool print_sidlist(TALLOC_CTX *mem_ctx, const DOM_SID *sids,
		   size_t num_sids, char **result, ssize_t *len)
{
	size_t i;
	size_t buflen = 0;

	*len = 0;
	*result = NULL;
	for (i=0; i<num_sids; i++) {
		fstring tmp;
		sprintf_append(mem_ctx, result, len, &buflen,
			       "%s\n", sid_to_fstring(tmp, &sids[i]));
	}

	if ((num_sids != 0) && (*result == NULL)) {
		return False;
	}

	return True;
}

bool parse_sidlist(TALLOC_CTX *mem_ctx, const char *sidstr,
		   DOM_SID **sids, size_t *num_sids)
{
	const char *p, *q;

	p = sidstr;
	if (p == NULL)
		return False;

	while (p[0] != '\0') {
		fstring tmp;
		size_t sidlen;
		DOM_SID sid;
		q = strchr(p, '\n');
		if (q == NULL) {
			DEBUG(0, ("Got invalid sidstr: %s\n", p));
			return False;
		}
		sidlen = PTR_DIFF(q, p);
		if (sidlen >= sizeof(tmp)-1) {
			return false;
		}
		memcpy(tmp, p, sidlen);
		tmp[sidlen] = '\0';
		q += 1;
		if (!string_to_sid(&sid, tmp)) {
			DEBUG(0, ("Could not parse sid %s\n", p));
			return False;
		}
		if (!NT_STATUS_IS_OK(add_sid_to_array(mem_ctx, &sid, sids,
						      num_sids)))
		{
			return False;
		}
		p = q;
	}
	return True;
}

enum winbindd_result winbindd_dual_ping(struct winbindd_domain *domain,
					struct winbindd_cli_state *state)
{
	return WINBINDD_OK;
}