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util.c revision 1.4 
      1 /*	$NetBSD: util.c,v 1.4 2025/09/05 21:16:31 christos Exp $	*/
      2 
      3 /* $OpenLDAP$ */
      4 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
      5  *
      6  * Copyright 1999-2024 The OpenLDAP Foundation.
      7  * Portions Copyright 1999 Dmitry Kovalev.
      8  * Portions Copyright 2002 Pierangelo Masarati.
      9  * All rights reserved.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted only as authorized by the OpenLDAP
     13  * Public License.
     14  *
     15  * A copy of this license is available in the file LICENSE in the
     16  * top-level directory of the distribution or, alternatively, at
     17  * <http://www.OpenLDAP.org/license.html>.
     18  */
     19 /* ACKNOWLEDGEMENTS:
     20  * This work was initially developed by Dmitry Kovalev for inclusion
     21  * by OpenLDAP Software.  Additional significant contributors include
     22  * Pierangelo Masarati.
     23  */
     24 
     25 #include <sys/cdefs.h>
     26 __RCSID("$NetBSD: util.c,v 1.4 2025/09/05 21:16:31 christos Exp $");
     27 
     28 #include "portable.h"
     29 
     30 #include <stdio.h>
     31 #include <sys/types.h>
     32 #include "ac/string.h"
     33 #include "ac/ctype.h"
     34 #include "ac/stdarg.h"
     35 
     36 #include "slap.h"
     37 #include "proto-sql.h"
     38 #include "lutil.h"
     39 
     40 #define BACKSQL_MAX(a,b) ((a)>(b)?(a):(b))
     41 #define BACKSQL_MIN(a,b) ((a)<(b)?(a):(b))
     42 
     43 #define BACKSQL_STR_GROW 256
     44 
     45 const char backsql_def_oc_query[] =
     46 	"SELECT id,name,keytbl,keycol,create_proc,delete_proc,expect_return "
     47 	"FROM ldap_oc_mappings";
     48 const char backsql_def_needs_select_oc_query[] =
     49 	"SELECT id,name,keytbl,keycol,create_proc,create_keyval,delete_proc,"
     50 	"expect_return FROM ldap_oc_mappings";
     51 const char backsql_def_at_query[] =
     52 	"SELECT name,sel_expr,from_tbls,join_where,add_proc,delete_proc,"
     53 	"param_order,expect_return,sel_expr_u FROM ldap_attr_mappings "
     54 	"WHERE oc_map_id=?";
     55 const char backsql_def_delentry_stmt[] = "DELETE FROM ldap_entries WHERE id=?";
     56 const char backsql_def_renentry_stmt[] =
     57 	"UPDATE ldap_entries SET dn=?,parent=?,keyval=? WHERE id=?";
     58 const char backsql_def_insentry_stmt[] =
     59 	"INSERT INTO ldap_entries (dn,oc_map_id,parent,keyval) "
     60 	"VALUES (?,?,?,?)";
     61 const char backsql_def_delobjclasses_stmt[] = "DELETE FROM ldap_entry_objclasses "
     62 	"WHERE entry_id=?";
     63 const char backsql_def_subtree_cond[] = "ldap_entries.dn LIKE CONCAT('%',?)";
     64 const char backsql_def_upper_subtree_cond[] = "(ldap_entries.dn) LIKE CONCAT('%',?)";
     65 const char backsql_id_query[] = "SELECT id,keyval,oc_map_id,dn FROM ldap_entries WHERE ";
     66 /* better ?||? or cast(?||? as varchar) */
     67 const char backsql_def_concat_func[] = "CONCAT(?,?)";
     68 
     69 /* TimesTen */
     70 const char backsql_check_dn_ru_query[] = "SELECT dn_ru FROM ldap_entries";
     71 
     72 struct berbuf *
     73 backsql_strcat_x( struct berbuf *dest, void *memctx, ... )
     74 {
     75 	va_list		strs;
     76 	ber_len_t	cdlen, cslen, grow;
     77 	char		*cstr;
     78 
     79 	assert( dest != NULL );
     80 	assert( dest->bb_val.bv_val == NULL
     81 			|| dest->bb_val.bv_len == strlen( dest->bb_val.bv_val ) );
     82 
     83 #ifdef BACKSQL_TRACE
     84 	Debug( LDAP_DEBUG_TRACE, "==>backsql_strcat()\n" );
     85 #endif /* BACKSQL_TRACE */
     86 
     87 	va_start( strs, memctx );
     88 	if ( dest->bb_val.bv_val == NULL || dest->bb_len == 0 ) {
     89 		dest->bb_val.bv_val = (char *)ber_memalloc_x( BACKSQL_STR_GROW * sizeof( char ), memctx );
     90 		dest->bb_val.bv_len = 0;
     91 		dest->bb_len = BACKSQL_STR_GROW;
     92 	}
     93 	cdlen = dest->bb_val.bv_len;
     94 	while ( ( cstr = va_arg( strs, char * ) ) != NULL ) {
     95 		cslen = strlen( cstr );
     96 		grow = BACKSQL_MAX( BACKSQL_STR_GROW, cslen );
     97 		if ( dest->bb_len - cdlen <= cslen ) {
     98 			char	*tmp_dest;
     99 
    100 #ifdef BACKSQL_TRACE
    101 			Debug( LDAP_DEBUG_TRACE, "backsql_strcat(): "
    102 				"buflen=%d, cdlen=%d, cslen=%d "
    103 				"-- reallocating dest\n",
    104 				dest->bb_len, cdlen + 1, cslen );
    105 #endif /* BACKSQL_TRACE */
    106 
    107 			tmp_dest = (char *)ber_memrealloc_x( dest->bb_val.bv_val,
    108 					dest->bb_len + grow * sizeof( char ), memctx );
    109 			if ( tmp_dest == NULL ) {
    110 				Debug( LDAP_DEBUG_ANY, "backsql_strcat(): "
    111 					"could not reallocate string buffer.\n" );
    112 				va_end( strs );
    113 				return NULL;
    114 			}
    115 			dest->bb_val.bv_val = tmp_dest;
    116 			dest->bb_len += grow;
    117 
    118 #ifdef BACKSQL_TRACE
    119 			Debug( LDAP_DEBUG_TRACE, "backsql_strcat(): "
    120 				"new buflen=%d, dest=%p\n",
    121 				dest->bb_len, dest );
    122 #endif /* BACKSQL_TRACE */
    123 		}
    124 		AC_MEMCPY( dest->bb_val.bv_val + cdlen, cstr, cslen + 1 );
    125 		cdlen += cslen;
    126 	}
    127 	va_end( strs );
    128 
    129 #ifdef BACKSQL_TRACE
    130 	Debug( LDAP_DEBUG_TRACE, "<==backsql_strcat() (dest=\"%s\")\n",
    131 			dest->bb_val.bv_val );
    132 #endif /* BACKSQL_TRACE */
    133 
    134 	dest->bb_val.bv_len = cdlen;
    135 
    136 	return dest;
    137 }
    138 
    139 struct berbuf *
    140 backsql_strfcat_x( struct berbuf *dest, void *memctx, const char *fmt, ... )
    141 {
    142 	va_list		strs;
    143 	ber_len_t	cdlen;
    144 
    145 	assert( dest != NULL );
    146 	assert( fmt != NULL );
    147 	assert( dest->bb_len == 0 || dest->bb_len > dest->bb_val.bv_len );
    148 	assert( dest->bb_val.bv_val == NULL
    149 			|| dest->bb_val.bv_len == strlen( dest->bb_val.bv_val ) );
    150 
    151 #ifdef BACKSQL_TRACE
    152 	Debug( LDAP_DEBUG_TRACE, "==>backsql_strfcat()\n" );
    153 #endif /* BACKSQL_TRACE */
    154 
    155 	va_start( strs, fmt );
    156 	if ( dest->bb_val.bv_val == NULL || dest->bb_len == 0 ) {
    157 		dest->bb_val.bv_val = (char *)ber_memalloc_x( BACKSQL_STR_GROW * sizeof( char ), memctx );
    158 		dest->bb_val.bv_len = 0;
    159 		dest->bb_len = BACKSQL_STR_GROW;
    160 	}
    161 
    162 	cdlen = dest->bb_val.bv_len;
    163 	for ( ; fmt[0]; fmt++ ) {
    164 		ber_len_t	cslen, grow;
    165 		char		*cstr, cc[ 2 ] = { '\0', '\0' };
    166 		struct berval	*cbv;
    167 
    168 		switch ( fmt[ 0 ] ) {
    169 
    170 		/* berval */
    171 		case 'b':
    172 			cbv = va_arg( strs, struct berval * );
    173 			cstr = cbv->bv_val;
    174 			cslen = cbv->bv_len;
    175 			break;
    176 
    177 		/* length + string */
    178 		case 'l':
    179 			cslen = va_arg( strs, ber_len_t );
    180 			cstr = va_arg( strs, char * );
    181 			break;
    182 
    183 		/* string */
    184 		case 's':
    185 			cstr = va_arg( strs, char * );
    186 			cslen = strlen( cstr );
    187 			break;
    188 
    189 		/* char */
    190 		case 'c':
    191 			/*
    192 			 * `char' is promoted to `int' when passed through `...'
    193 			 */
    194 			cc[0] = va_arg( strs, int );
    195 			cstr = cc;
    196 			cslen = 1;
    197 			break;
    198 
    199 		default:
    200 			assert( 0 );
    201 		}
    202 
    203 		grow = BACKSQL_MAX( BACKSQL_STR_GROW, cslen );
    204 		if ( dest->bb_len - cdlen <= cslen ) {
    205 			char	*tmp_dest;
    206 
    207 #ifdef BACKSQL_TRACE
    208 			Debug( LDAP_DEBUG_TRACE, "backsql_strfcat(): "
    209 				"buflen=%d, cdlen=%d, cslen=%d "
    210 				"-- reallocating dest\n",
    211 				dest->bb_len, cdlen + 1, cslen );
    212 #endif /* BACKSQL_TRACE */
    213 
    214 			tmp_dest = (char *)ber_memrealloc_x( dest->bb_val.bv_val,
    215 					( dest->bb_len ) + grow * sizeof( char ), memctx );
    216 			if ( tmp_dest == NULL ) {
    217 				Debug( LDAP_DEBUG_ANY, "backsql_strfcat(): "
    218 					"could not reallocate string buffer.\n" );
    219 				va_end( strs );
    220 				return NULL;
    221 			}
    222 			dest->bb_val.bv_val = tmp_dest;
    223 			dest->bb_len += grow * sizeof( char );
    224 
    225 #ifdef BACKSQL_TRACE
    226 			Debug( LDAP_DEBUG_TRACE, "backsql_strfcat(): "
    227 				"new buflen=%d, dest=%p\n", dest->bb_len, dest );
    228 #endif /* BACKSQL_TRACE */
    229 		}
    230 
    231 		assert( cstr != NULL );
    232 
    233 		AC_MEMCPY( dest->bb_val.bv_val + cdlen, cstr, cslen + 1 );
    234 		cdlen += cslen;
    235 	}
    236 
    237 	va_end( strs );
    238 
    239 #ifdef BACKSQL_TRACE
    240 	Debug( LDAP_DEBUG_TRACE, "<==backsql_strfcat() (dest=\"%s\")\n",
    241 			dest->bb_val.bv_val );
    242 #endif /* BACKSQL_TRACE */
    243 
    244 	dest->bb_val.bv_len = cdlen;
    245 
    246 	return dest;
    247 }
    248 
    249 int
    250 backsql_entry_addattr(
    251 	Entry			*e,
    252 	AttributeDescription	*ad,
    253 	struct berval		*val,
    254 	void			*memctx )
    255 {
    256 	int			rc;
    257 
    258 #ifdef BACKSQL_TRACE
    259 	Debug( LDAP_DEBUG_TRACE, "backsql_entry_addattr(\"%s\"): %s=%s\n",
    260 		e->e_name.bv_val, ad->ad_cname.bv_val, val->bv_val );
    261 #endif /* BACKSQL_TRACE */
    262 
    263 	rc = attr_merge_normalize_one( e, ad, val, memctx );
    264 
    265 	if ( rc != LDAP_SUCCESS ) {
    266 		Debug( LDAP_DEBUG_TRACE, "backsql_entry_addattr(\"%s\"): "
    267 			"failed to merge value \"%s\" for attribute \"%s\"\n",
    268 			e->e_name.bv_val, val->bv_val, ad->ad_cname.bv_val );
    269 		return rc;
    270 	}
    271 
    272 #ifdef BACKSQL_TRACE
    273 	Debug( LDAP_DEBUG_TRACE, "<==backsql_entry_addattr(\"%s\")\n",
    274 		e->e_name.bv_val );
    275 #endif /* BACKSQL_TRACE */
    276 
    277 	return LDAP_SUCCESS;
    278 }
    279 
    280 static char *
    281 backsql_get_table_spec( backsql_info *bi, char **p )
    282 {
    283 	char		*s, *q;
    284 	struct berbuf	res = BB_NULL;
    285 
    286 	assert( p != NULL );
    287 	assert( *p != NULL );
    288 
    289 	s = *p;
    290 	while ( **p && **p != ',' ) {
    291 		(*p)++;
    292 	}
    293 
    294 	if ( **p ) {
    295 		*(*p)++ = '\0';
    296 	}
    297 
    298 #define BACKSQL_NEXT_WORD { \
    299 		while ( *s && isspace( (unsigned char)*s ) ) s++; \
    300 		if ( !*s ) return res.bb_val.bv_val; \
    301 		q = s; \
    302 		while ( *q && !isspace( (unsigned char)*q ) ) q++; \
    303 		if ( *q ) *q++='\0'; \
    304 	}
    305 
    306 	BACKSQL_NEXT_WORD;
    307 	/* table name */
    308 	backsql_strcat_x( &res, NULL, s, NULL );
    309 	s = q;
    310 
    311 	BACKSQL_NEXT_WORD;
    312 	if ( strcasecmp( s, "AS" ) == 0 ) {
    313 		s = q;
    314 		BACKSQL_NEXT_WORD;
    315 	}
    316 
    317 	/* oracle doesn't understand "AS" :( and other RDBMSes don't need it */
    318 	backsql_strfcat_x( &res, NULL, "lbbsb",
    319 			STRLENOF( " " ), " ",
    320 			&bi->sql_aliasing,
    321 			&bi->sql_aliasing_quote,
    322 			s,
    323 			&bi->sql_aliasing_quote );
    324 
    325 	return res.bb_val.bv_val;
    326 }
    327 
    328 int
    329 backsql_merge_from_clause(
    330 	backsql_info	*bi,
    331 	struct berbuf	*dest_from,
    332 	struct berval	*src_from )
    333 {
    334 	char		*s, *p, *srcc, *pos, e;
    335 	struct berbuf	res = BB_NULL;
    336 
    337 #ifdef BACKSQL_TRACE
    338 	Debug( LDAP_DEBUG_TRACE, "==>backsql_merge_from_clause(): "
    339 		"dest_from=\"%s\",src_from=\"%s\"\n",
    340  		dest_from ? dest_from->bb_val.bv_val : "<NULL>",
    341 		src_from->bv_val );
    342 #endif /* BACKSQL_TRACE */
    343 
    344 	srcc = ch_strdup( src_from->bv_val );
    345 	p = srcc;
    346 
    347 	if ( dest_from != NULL ) {
    348 		res = *dest_from;
    349 	}
    350 
    351 	while ( *p ) {
    352 		s = backsql_get_table_spec( bi, &p );
    353 
    354 #ifdef BACKSQL_TRACE
    355 		Debug( LDAP_DEBUG_TRACE, "backsql_merge_from_clause(): "
    356 			"p=\"%s\" s=\"%s\"\n", p, s );
    357 #endif /* BACKSQL_TRACE */
    358 
    359 		if ( BER_BVISNULL( &res.bb_val ) ) {
    360 			backsql_strcat_x( &res, NULL, s, NULL );
    361 
    362 		} else {
    363 			pos = strstr( res.bb_val.bv_val, s );
    364 			if ( pos == NULL || ( ( e = pos[ strlen( s ) ] ) != '\0' && e != ',' ) ) {
    365 				backsql_strfcat_x( &res, NULL, "cs", ',', s );
    366 			}
    367 		}
    368 
    369 		if ( s ) {
    370 			ch_free( s );
    371 		}
    372 	}
    373 
    374 #ifdef BACKSQL_TRACE
    375 	Debug( LDAP_DEBUG_TRACE, "<==backsql_merge_from_clause()\n" );
    376 #endif /* BACKSQL_TRACE */
    377 
    378 	free( srcc );
    379 	*dest_from = res;
    380 
    381 	return 1;
    382 }
    383 
    384 /*
    385  * splits a pattern in components separated by '?'
    386  * (double ?? are turned into single ? and left in the string)
    387  * expected contains the number of expected occurrences of '?'
    388  * (a negative value means parse as many as possible)
    389  */
    390 
    391 int
    392 backsql_split_pattern(
    393 	const char	*_pattern,
    394 	BerVarray	*split_pattern,
    395 	int		expected )
    396 {
    397 	char		*pattern, *start, *end;
    398 	struct berval	bv;
    399 	int		rc = 0;
    400 
    401 #define SPLIT_CHAR	'?'
    402 
    403 	assert( _pattern != NULL );
    404 	assert( split_pattern != NULL );
    405 
    406 	pattern = ch_strdup( _pattern );
    407 
    408 	start = pattern;
    409 	end = strchr( start, SPLIT_CHAR );
    410 	for ( ; start; expected-- ) {
    411 		char		*real_end = end;
    412 		ber_len_t	real_len;
    413 
    414 		if ( real_end == NULL ) {
    415 			real_end = start + strlen( start );
    416 
    417 		} else if ( real_end[ 1 ] == SPLIT_CHAR ) {
    418 			expected++;
    419 			AC_MEMCPY( real_end, real_end + 1, strlen( real_end ) );
    420 			end = strchr( real_end + 1, SPLIT_CHAR );
    421 			continue;
    422 		}
    423 
    424 		real_len = real_end - start;
    425 		if ( real_len == 0 ) {
    426 			ber_str2bv( "", 0, 1, &bv );
    427 		} else {
    428 			ber_str2bv( start, real_len, 1, &bv );
    429 		}
    430 
    431 		ber_bvarray_add( split_pattern, &bv );
    432 
    433 		if ( expected == 0 ) {
    434 			if ( end != NULL ) {
    435 				rc = -1;
    436 				goto done;
    437 			}
    438 			break;
    439 		}
    440 
    441 		if ( end != NULL ) {
    442 			start = end + 1;
    443 			end = strchr( start, SPLIT_CHAR );
    444 		}
    445 	}
    446 
    447 done:;
    448 
    449      	ch_free( pattern );
    450 
    451 	return rc;
    452 }
    453 
    454 int
    455 backsql_prepare_pattern(
    456 	BerVarray	split_pattern,
    457 	BerVarray	values,
    458 	struct berval	*res )
    459 {
    460 	int		i;
    461 	struct berbuf	bb = BB_NULL;
    462 
    463 	assert( res != NULL );
    464 
    465 	for ( i = 0; values[i].bv_val; i++ ) {
    466 		if ( split_pattern[i].bv_val == NULL ) {
    467 			ch_free( bb.bb_val.bv_val );
    468 			return -1;
    469 		}
    470 		backsql_strfcat_x( &bb, NULL, "b", &split_pattern[ i ] );
    471 		backsql_strfcat_x( &bb, NULL, "b", &values[ i ] );
    472 	}
    473 
    474 	if ( split_pattern[ i ].bv_val == NULL ) {
    475 		ch_free( bb.bb_val.bv_val );
    476 		return -1;
    477 	}
    478 
    479 	backsql_strfcat_x( &bb, NULL, "b", &split_pattern[ i ] );
    480 
    481 	*res = bb.bb_val;
    482 
    483 	return 0;
    484 }
    485 
    486 int
    487 backsql_entryUUID(
    488 	backsql_info	*bi,
    489 	backsql_entryID	*id,
    490 	struct berval	*entryUUID,
    491 	void		*memctx )
    492 {
    493 	char		uuidbuf[ LDAP_LUTIL_UUIDSTR_BUFSIZE ];
    494 	struct berval	uuid;
    495 #ifdef BACKSQL_ARBITRARY_KEY
    496 	int		i;
    497 	ber_len_t	l, lmax;
    498 #endif /* BACKSQL_ARBITRARY_KEY */
    499 
    500 	/* entryUUID is generated as "%08x-%04x-%04x-0000-eaddrXXX"
    501 	 * with eid_oc_id as %08x and hi and lo eid_id as %04x-%04x */
    502 	assert( bi != NULL );
    503 	assert( id != NULL );
    504 	assert( entryUUID != NULL );
    505 
    506 #ifdef BACKSQL_ARBITRARY_KEY
    507 	snprintf( uuidbuf, sizeof( uuidbuf ),
    508 			"%08x-0000-0000-0000-000000000000",
    509 			( id->eid_oc_id & 0xFFFFFFFF ) );
    510 	lmax = id->eid_keyval.bv_len < 12 ? id->eid_keyval.bv_len : 12;
    511 	for ( l = 0, i = 9; l < lmax; l++, i += 2 ) {
    512 		switch ( i ) {
    513 		case STRLENOF( "00000000-0000" ):
    514 		case STRLENOF( "00000000-0000-0000" ):
    515 		case STRLENOF( "00000000-0000-0000-0000" ):
    516 			uuidbuf[ i++ ] = '-';
    517 		/* FALLTHRU */
    518 
    519 		default:
    520 			snprintf( &uuidbuf[ i ], 3, "%2x", id->eid_keyval.bv_val[ l ] );
    521 			break;
    522 		}
    523 	}
    524 #else /* ! BACKSQL_ARBITRARY_KEY */
    525 	/* note: works only with 32 bit architectures... */
    526 	snprintf( uuidbuf, sizeof( uuidbuf ),
    527 			"%08x-%04x-%04x-0000-000000000000",
    528 			( (unsigned)id->eid_oc_id & 0xFFFFFFFF ),
    529 			( ( (unsigned)id->eid_keyval & 0xFFFF0000 ) >> 020 /* 16 */ ),
    530 			( (unsigned)id->eid_keyval & 0xFFFF ) );
    531 #endif /* ! BACKSQL_ARBITRARY_KEY */
    532 
    533 	uuid.bv_val = uuidbuf;
    534 	uuid.bv_len = strlen( uuidbuf );
    535 
    536 	ber_dupbv_x( entryUUID, &uuid, memctx );
    537 
    538 	return 0;
    539 }
    540 
    541 int
    542 backsql_entryUUID_decode(
    543 	struct berval	*entryUUID,
    544 	unsigned long	*oc_id,
    545 #ifdef BACKSQL_ARBITRARY_KEY
    546 	struct berval	*keyval
    547 #else /* ! BACKSQL_ARBITRARY_KEY */
    548 	unsigned long	*keyval
    549 #endif /* ! BACKSQL_ARBITRARY_KEY */
    550 	)
    551 {
    552 #if 0
    553 	fprintf( stderr, "==> backsql_entryUUID_decode()\n" );
    554 #endif
    555 
    556 	*oc_id = ( entryUUID->bv_val[0] << 030 /* 24 */ )
    557 		+ ( entryUUID->bv_val[1] << 020 /* 16 */ )
    558 		+ ( entryUUID->bv_val[2] << 010 /* 8 */ )
    559 		+ entryUUID->bv_val[3];
    560 
    561 #ifdef BACKSQL_ARBITRARY_KEY
    562 	/* FIXME */
    563 #else /* ! BACKSQL_ARBITRARY_KEY */
    564 	*keyval = ( entryUUID->bv_val[4] << 030 /* 24 */ )
    565 		+ ( entryUUID->bv_val[5] << 020 /* 16 */ )
    566 		+ ( entryUUID->bv_val[6] << 010 /* 8 */ )
    567 		+ entryUUID->bv_val[7];
    568 #endif /* ! BACKSQL_ARBITRARY_KEY */
    569 
    570 #if 0
    571 	fprintf( stderr, "<== backsql_entryUUID_decode(): oc=%lu id=%lu\n",
    572 			*oc_id, *keyval );
    573 #endif
    574 
    575 	return LDAP_SUCCESS;
    576 }
    577 
    578