/* 
   Unix SMB/CIFS implementation.
   client directory list routines
   Copyright (C) Andrew Tridgell 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.
*/

#define NO_SYSLOG

#include "includes.h"

/****************************************************************************
 Interpret a long filename structure - this is mostly guesses at the moment.
 The length of the structure is returned
 The structure of a long filename depends on the info level. 260 is used
 by NT and 2 is used by OS/2
****************************************************************************/

static int interpret_long_filename(struct cli_state *cli,
				   int level,char *p,file_info *finfo)
{
	extern file_info def_finfo;
	file_info finfo2;
	int len;
	char *base = p;

	if (!finfo) finfo = &finfo2;

	memcpy(finfo,&def_finfo,sizeof(*finfo));

	switch (level) {
		case 1: /* OS/2 understands this */
			/* these dates are converted to GMT by
                           make_unix_date */
			finfo->ctime = make_unix_date2(p+4);
			finfo->atime = make_unix_date2(p+8);
			finfo->mtime = make_unix_date2(p+12);
			finfo->size = IVAL(p,16);
			finfo->mode = CVAL(p,24);
			len = CVAL(p, 26);
			p += 27;
			p += clistr_align_in(cli, p, 0);
			/* the len+2 below looks strange but it is
			   important to cope with the differences
			   between win2000 and win9x for this call
			   (tridge) */
			p += clistr_pull(cli, finfo->name, p,
					 sizeof(finfo->name),
					 len+2, 
					 STR_TERMINATE);
			return PTR_DIFF(p, base);

		case 2: /* this is what OS/2 uses mostly */
			/* these dates are converted to GMT by
                           make_unix_date */
			finfo->ctime = make_unix_date2(p+4);
			finfo->atime = make_unix_date2(p+8);
			finfo->mtime = make_unix_date2(p+12);
			finfo->size = IVAL(p,16);
			finfo->mode = CVAL(p,24);
			len = CVAL(p, 30);
			p += 31;
			/* check for unisys! */
			p += clistr_pull(cli, finfo->name, p,
					 sizeof(finfo->name),
					 len, 
					 STR_NOALIGN);
			return PTR_DIFF(p, base) + 1;
			
		case 260: /* NT uses this, but also accepts 2 */
		{
			int namelen, slen, flags = 0;
			p += 4; /* next entry offset */
			p += 4; /* fileindex */
				
			/* these dates appear to arrive in a
			   weird way. It seems to be localtime
			   plus the serverzone given in the
			   initial connect. This is GMT when
			   DST is not in effect and one hour
			   from GMT otherwise. Can this really
			   be right??
			   
			   I suppose this could be called
			   kludge-GMT. Is is the GMT you get
			   by using the current DST setting on
			   a different localtime. It will be
			   cheap to calculate, I suppose, as
			   no DST tables will be needed */
			
			finfo->ctime = interpret_long_date(p);
			p += 8;
			finfo->atime = interpret_long_date(p);
			p += 8;
			finfo->mtime = interpret_long_date(p);
			p += 8;
			p += 8;
			finfo->size = IVAL2_TO_SMB_BIG_UINT(p,0);
			p += 8;
			p += 8; /* alloc size */
			finfo->mode = CVAL(p,0);
			p += 4;
			namelen = IVAL(p,0);
			p += 4;
			p += 4; /* EA size */
			slen = SVAL(p, 0);
			p += 2; 
			{
				/* stupid NT bugs. grr */
				int flags = 0;
				if (p[1] == 0 && namelen > 1) flags |= STR_UNICODE;
				clistr_pull(cli, finfo->short_name, p,
					    sizeof(finfo->short_name),
					    slen, flags);
			}
			p += 24; /* short name? */	  

#ifndef HAVE_NATIVE_ICONV
                        if ((cli->capabilities & CAP_UNICODE) == 0)
                            flags = STR_ASCII;
#endif                      
			clistr_pull(cli, finfo->name, p,
				    sizeof(finfo->name),
				    namelen, flags);
			return SVAL(base, 0);
		}
	}
	
	DEBUG(1,("Unknown long filename format %d\n",level));
	return(SVAL(p,0));
}

/****************************************************************************
 Do a directory listing, calling fn on each file found.
****************************************************************************/

int cli_list_new(struct cli_state *cli,const char *Mask,uint16 attribute, 
		 void (*fn)(file_info *, const char *, void *), void *state)
{
#if 0
	int max_matches = 1366; /* Match W2k - was 512. */
#else
	int max_matches = 512;
#endif
	int info_level;
	char *p, *p2;
	pstring mask;
	file_info finfo;
	int i;
	char *tdl, *dirlist = NULL;
	int dirlist_len = 0;
	int total_received = -1;
	BOOL First = True;
	int ff_searchcount=0;
	int ff_eos=0;
	int ff_lastname=0;
	int ff_dir_handle=0;
	int loop_count = 0;
	char *rparam=NULL, *rdata=NULL;
	unsigned int param_len, data_len;	
	uint16 setup;
	pstring param;

	/* NT uses 260, OS/2 uses 2. Both accept 1. */
	info_level = (cli->capabilities&CAP_NT_SMBS)?260:1;

	pstrcpy(mask,Mask);
	
	while (ff_eos == 0) {
		loop_count++;
		if (loop_count > 200) {
			DEBUG(0,("Error: Looping in FIND_NEXT??\n"));
			break;
		}

		if (First) {
			setup = TRANSACT2_FINDFIRST;
			SSVAL(param,0,attribute); /* attribute */
			SSVAL(param,2,max_matches); /* max count */
			SSVAL(param,4,4+2);	/* resume required + close on end */
			SSVAL(param,6,info_level); 
			SIVAL(param,8,0);
			p = param+12;
			p += clistr_push(cli, param+12, mask, sizeof(param)-12, 
					 STR_TERMINATE);
		} else {
			setup = TRANSACT2_FINDNEXT;
			SSVAL(param,0,ff_dir_handle);
			SSVAL(param,2,max_matches); /* max count */
			SSVAL(param,4,info_level); 
			SIVAL(param,6,0); /* ff_resume_key */
			SSVAL(param,10,8+4+2);	/* continue + resume required + close on end */
			p = param+12;
			p += clistr_push(cli, param+12, mask, sizeof(param)-12, 
					 STR_TERMINATE);
		}

		param_len = PTR_DIFF(p, param);

		if (!cli_send_trans(cli, SMBtrans2, 
				    NULL,                   /* Name */
				    -1, 0,                  /* fid, flags */
				    &setup, 1, 0,           /* setup, length, max */
				    param, param_len, 10,   /* param, length, max */
				    NULL, 0, 
#if 0
				    /* w2k value. */
				    MIN(16384,cli->max_xmit) /* data, length, max. */
#else
				    cli->max_xmit	    /* data, length, max. */
#endif
				    )) {
			break;
		}

		if (!cli_receive_trans(cli, SMBtrans2, 
				       &rparam, &param_len,
				       &rdata, &data_len) &&
                    cli_is_dos_error(cli)) {
			/* we need to work around a Win95 bug - sometimes
			   it gives ERRSRV/ERRerror temprarily */
			uint8 eclass;
			uint32 ecode;
			cli_dos_error(cli, &eclass, &ecode);
			if (eclass != ERRSRV || ecode != ERRerror)
				break;
			msleep(100);
			continue;
		}

                if (cli_is_error(cli) || !rdata || !rparam) 
			break;

		if (total_received == -1)
			total_received = 0;

		/* parse out some important return info */
		p = rparam;
		if (First) {
			ff_dir_handle = SVAL(p,0);
			ff_searchcount = SVAL(p,2);
			ff_eos = SVAL(p,4);
			ff_lastname = SVAL(p,8);
		} else {
			ff_searchcount = SVAL(p,0);
			ff_eos = SVAL(p,2);
			ff_lastname = SVAL(p,6);
		}

		if (ff_searchcount == 0) 
			break;

		/* point to the data bytes */
		p = rdata;

		/* we might need the lastname for continuations */
		if (ff_lastname > 0) {
			switch(info_level) {
				case 260:
					clistr_pull(cli, mask, p+ff_lastname,
						    sizeof(mask), 
						    data_len-ff_lastname,
						    STR_TERMINATE);
					break;
				case 1:
					clistr_pull(cli, mask, p+ff_lastname+1,
						    sizeof(mask), 
						    -1,
						    STR_TERMINATE);
					break;
				}
		} else {
			pstrcpy(mask,"");
		}
 
		/* and add them to the dirlist pool */
		tdl = Realloc(dirlist,dirlist_len + data_len);

		if (!tdl) {
			DEBUG(0,("cli_list_new: Failed to expand dirlist\n"));
			break;
		} else {
			dirlist = tdl;
		}

		/* put in a length for the last entry, to ensure we can chain entries 
		   into the next packet */
		for (p2=p,i=0;i<(ff_searchcount-1);i++)
			p2 += interpret_long_filename(cli,info_level,p2,NULL);
		SSVAL(p2,0,data_len - PTR_DIFF(p2,p));

		/* grab the data for later use */
		memcpy(dirlist+dirlist_len,p,data_len);
		dirlist_len += data_len;

		total_received += ff_searchcount;

		SAFE_FREE(rdata);
		SAFE_FREE(rparam);

		DEBUG(3,("received %d entries (eos=%d)\n",
			 ff_searchcount,ff_eos));

		if (ff_searchcount > 0)
			loop_count = 0;

		First = False;
	}

	for (p=dirlist,i=0;i<total_received;i++) {
		p += interpret_long_filename(cli,info_level,p,&finfo);
		fn(&finfo, Mask, state);
	}

	/* free up the dirlist buffer */
	SAFE_FREE(dirlist);
	return(total_received);
}

/****************************************************************************
 Interpret a short filename structure.
 The length of the structure is returned.
****************************************************************************/

static int interpret_short_filename(struct cli_state *cli, char *p,file_info *finfo)
{
	extern file_info def_finfo;

	*finfo = def_finfo;

	finfo->mode = CVAL(p,21);
	
	/* this date is converted to GMT by make_unix_date */
	finfo->ctime = make_unix_date(p+22);
	finfo->mtime = finfo->atime = finfo->ctime;
	finfo->size = IVAL(p,26);
	clistr_pull(cli, finfo->name, p+30, sizeof(finfo->name), 12, STR_ASCII);
	if (strcmp(finfo->name, "..") && strcmp(finfo->name, ".")) {
		strncpy(finfo->short_name,finfo->name, sizeof(finfo->short_name)-1);
		finfo->short_name[sizeof(finfo->short_name)-1] = '\0';
	}

	return(DIR_STRUCT_SIZE);
}


/****************************************************************************
 Do a directory listing, calling fn on each file found.
 this uses the old SMBsearch interface. It is needed for testing Samba,
 but should otherwise not be used.
****************************************************************************/

int cli_list_old(struct cli_state *cli,const char *Mask,uint16 attribute, 
		 void (*fn)(file_info *, const char *, void *), void *state)
{
	char *p;
	int received = 0;
	BOOL first = True;
	char status[21];
	int num_asked = (cli->max_xmit - 100)/DIR_STRUCT_SIZE;
	int num_received = 0;
	int i;
	char *tdl, *dirlist = NULL;
	pstring mask;
	
	ZERO_ARRAY(status);

	pstrcpy(mask,Mask);
  
	while (1) {
		memset(cli->outbuf,'\0',smb_size);
		memset(cli->inbuf,'\0',smb_size);

		set_message(cli->outbuf,2,0,True);

		SCVAL(cli->outbuf,smb_com,SMBsearch);

		SSVAL(cli->outbuf,smb_tid,cli->cnum);
		cli_setup_packet(cli);

		SSVAL(cli->outbuf,smb_vwv0,num_asked);
		SSVAL(cli->outbuf,smb_vwv1,attribute);
  
		p = smb_buf(cli->outbuf);
		*p++ = 4;
      
		p += clistr_push(cli, p, first?mask:"", -1, STR_TERMINATE);
		*p++ = 5;
		if (first) {
			SSVAL(p,0,0);
			p += 2;
		} else {
			SSVAL(p,0,21);
			p += 2;
			memcpy(p,status,21);
			p += 21;
		}

		cli_setup_bcc(cli, p);
		cli_send_smb(cli);
		if (!cli_receive_smb(cli)) break;

		received = SVAL(cli->inbuf,smb_vwv0);
		if (received <= 0) break;

		first = False;

		tdl = Realloc(dirlist,(num_received + received)*DIR_STRUCT_SIZE);

		if (!tdl) {
			DEBUG(0,("cli_list_old: failed to expand dirlist"));
			SAFE_FREE(dirlist);
			return 0;
		}
		else dirlist = tdl;

		p = smb_buf(cli->inbuf) + 3;

		memcpy(dirlist+num_received*DIR_STRUCT_SIZE,
		       p,received*DIR_STRUCT_SIZE);
		
		memcpy(status,p + ((received-1)*DIR_STRUCT_SIZE),21);
		
		num_received += received;
		
		if (cli_is_error(cli)) break;
	}

	if (!first) {
		memset(cli->outbuf,'\0',smb_size);
		memset(cli->inbuf,'\0',smb_size);

		set_message(cli->outbuf,2,0,True);
		SCVAL(cli->outbuf,smb_com,SMBfclose);
		SSVAL(cli->outbuf,smb_tid,cli->cnum);
		cli_setup_packet(cli);

		SSVAL(cli->outbuf, smb_vwv0, 0); /* find count? */
		SSVAL(cli->outbuf, smb_vwv1, attribute);

		p = smb_buf(cli->outbuf);
		*p++ = 4;
		fstrcpy(p, "");
		p += strlen(p) + 1;
		*p++ = 5;
		SSVAL(p, 0, 21);
		p += 2;
		memcpy(p,status,21);
		p += 21;
		
		cli_setup_bcc(cli, p);
		cli_send_smb(cli);
		if (!cli_receive_smb(cli)) {
			DEBUG(0,("Error closing search: %s\n",cli_errstr(cli)));
		}
	}

	for (p=dirlist,i=0;i<num_received;i++) {
		file_info finfo;
		p += interpret_short_filename(cli, p,&finfo);
		fn(&finfo, Mask, state);
	}

	SAFE_FREE(dirlist);
	return(num_received);
}

/****************************************************************************
 Do a directory listing, calling fn on each file found.
 This auto-switches between old and new style.
****************************************************************************/

int cli_list(struct cli_state *cli,const char *Mask,uint16 attribute, 
	     void (*fn)(file_info *, const char *, void *), void *state)
{
	if (cli->protocol <= PROTOCOL_LANMAN1)
		return cli_list_old(cli, Mask, attribute, fn, state);
	return cli_list_new(cli, Mask, attribute, fn, state);
}