2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4 * Copyright 2000-2011 The OpenLDAP Foundation.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted only as authorized by the OpenLDAP
11 * A copy of this license is available in the file LICENSE in the
12 * top-level directory of the distribution or, alternatively, at
13 * <http://www.OpenLDAP.org/license.html>.
16 * This work was initially developed by Pierangelo Masarati for
17 * inclusion in OpenLDAP Software.
22 #include "rewrite-int.h"
25 * Compiles a substitution pattern
27 struct rewrite_subst *
28 rewrite_subst_compile(
29 struct rewrite_info *info,
34 struct berval *subs = NULL, *tmps;
35 struct rewrite_submatch *submatch = NULL;
37 struct rewrite_subst *s = NULL;
39 char *result, *begin, *p;
42 assert( info != NULL );
43 assert( str != NULL );
45 result = strdup( str );
46 if ( result == NULL ) {
51 * Take care of substitution string
53 for ( p = begin = result, subs_len = 0; p[ 0 ] != '\0'; p++ ) {
56 * Keep only single escapes '%'
58 if ( !IS_REWRITE_SUBMATCH_ESCAPE( p[ 0 ] ) ) {
62 if ( IS_REWRITE_SUBMATCH_ESCAPE( p[ 1 ] ) ) {
63 /* Pull &p[1] over p, including the trailing '\0' */
64 AC_MEMCPY((char *)p, &p[ 1 ], strlen( p ) );
68 tmps = ( struct berval * )realloc( subs,
69 sizeof( struct berval )*( nsub + 1 ) );
76 * I think an `if l > 0' at runtime is better outside than
77 * inside a function call ...
82 subs[ nsub ].bv_len = l;
83 subs[ nsub ].bv_val = malloc( l + 1 );
84 if ( subs[ nsub ].bv_val == NULL ) {
87 AC_MEMCPY( subs[ nsub ].bv_val, begin, l );
88 subs[ nsub ].bv_val[ l ] = '\0';
90 subs[ nsub ].bv_val = NULL;
91 subs[ nsub ].bv_len = 0;
95 * Substitution pattern
97 if ( isdigit( (unsigned char) p[ 1 ] ) ) {
98 struct rewrite_submatch *tmpsm;
102 * Add a new value substitution scheme
105 tmpsm = ( struct rewrite_submatch * )realloc( submatch,
106 sizeof( struct rewrite_submatch )*( nsub + 1 ) );
107 if ( tmpsm == NULL ) {
111 submatch[ nsub ].ls_submatch = d;
114 * If there is no argument, use default
115 * (substitute substring as is)
117 if ( p[ 2 ] != '{' ) {
118 submatch[ nsub ].ls_type =
119 REWRITE_SUBMATCH_ASIS;
120 submatch[ nsub ].ls_map = NULL;
124 struct rewrite_map *map;
126 submatch[ nsub ].ls_type =
127 REWRITE_SUBMATCH_XMAP;
129 map = rewrite_xmap_parse( info,
130 p + 3, (const char **)&begin );
134 submatch[ nsub ].ls_map = map;
141 } else if ( p[ 1 ] == '{' ) {
142 struct rewrite_map *map;
143 struct rewrite_submatch *tmpsm;
145 map = rewrite_map_parse( info, p + 2,
146 (const char **)&begin );
153 * Add a new value substitution scheme
155 tmpsm = ( struct rewrite_submatch * )realloc( submatch,
156 sizeof( struct rewrite_submatch )*( nsub + 1 ) );
157 if ( tmpsm == NULL ) {
161 submatch[ nsub ].ls_type =
162 REWRITE_SUBMATCH_MAP_W_ARG;
163 submatch[ nsub ].ls_map = map;
168 } else if ( p[ 1 ] == '%' ) {
169 AC_MEMCPY( &p[ 1 ], &p[ 2 ], strlen( &p[ 1 ] ) );
180 * Last part of string
182 tmps = (struct berval * )realloc( subs, sizeof( struct berval )*( nsub + 1 ) );
183 if ( tmps == NULL ) {
185 * XXX need to free the value subst stuff!
194 subs[ nsub ].bv_len = l;
195 subs[ nsub ].bv_val = malloc( l + 1 );
196 if ( subs[ nsub ].bv_val == NULL ) {
200 AC_MEMCPY( subs[ nsub ].bv_val, begin, l );
201 subs[ nsub ].bv_val[ l ] = '\0';
203 subs[ nsub ].bv_val = NULL;
204 subs[ nsub ].bv_len = 0;
207 s = calloc( sizeof( struct rewrite_subst ), 1 );
212 s->lt_subs_len = subs_len;
214 s->lt_num_submatch = nsub;
215 s->lt_submatch = submatch;
224 * Copies the match referred to by submatch and fetched in string by match.
225 * Helper for rewrite_rule_apply.
229 struct rewrite_submatch *submatch,
231 const regmatch_t *match,
238 assert( submatch != NULL );
239 assert( submatch->ls_type == REWRITE_SUBMATCH_ASIS
240 || submatch->ls_type == REWRITE_SUBMATCH_XMAP );
241 assert( string != NULL );
242 assert( match != NULL );
243 assert( val != NULL );
244 assert( val->bv_val == NULL );
246 c = submatch->ls_submatch;
247 s = string + match[ c ].rm_so;
248 l = match[ c ].rm_eo - match[ c ].rm_so;
251 val->bv_val = malloc( l + 1 );
252 if ( val->bv_val == NULL ) {
256 AC_MEMCPY( val->bv_val, s, l );
257 val->bv_val[ l ] = '\0';
259 return REWRITE_SUCCESS;
263 * Substitutes a portion of rewritten string according to substitution
264 * pattern using submatches
268 struct rewrite_info *info,
269 struct rewrite_op *op,
270 struct rewrite_subst *subst,
272 const regmatch_t *match,
276 struct berval *submatch = NULL;
279 int rc = REWRITE_REGEXEC_OK;
281 assert( info != NULL );
282 assert( op != NULL );
283 assert( subst != NULL );
284 assert( string != NULL );
285 assert( match != NULL );
286 assert( val != NULL );
288 assert( val->bv_val == NULL );
294 * Prepare room for submatch expansion
296 if ( subst->lt_num_submatch > 0 ) {
297 submatch = calloc( sizeof( struct berval ),
298 subst->lt_num_submatch );
299 if ( submatch == NULL ) {
300 return REWRITE_REGEXEC_ERR;
305 * Resolve submatches (simple subst, map expansion and so).
307 for ( n = 0, l = 0; n < subst->lt_num_submatch; n++ ) {
308 struct berval key = { 0, NULL };
310 submatch[ n ].bv_val = NULL;
315 switch ( subst->lt_submatch[ n ].ls_type ) {
316 case REWRITE_SUBMATCH_ASIS:
317 case REWRITE_SUBMATCH_XMAP:
318 rc = submatch_copy( &subst->lt_submatch[ n ],
319 string, match, &key );
320 if ( rc != REWRITE_SUCCESS ) {
321 rc = REWRITE_REGEXEC_ERR;
326 case REWRITE_SUBMATCH_MAP_W_ARG:
327 switch ( subst->lt_submatch[ n ].ls_map->lm_type ) {
328 case REWRITE_MAP_GET_OP_VAR:
329 case REWRITE_MAP_GET_SESN_VAR:
330 case REWRITE_MAP_GET_PARAM:
331 rc = REWRITE_SUCCESS;
335 rc = rewrite_subst_apply( info, op,
336 subst->lt_submatch[ n ].ls_map->lm_subst,
337 string, match, &key);
340 if ( rc != REWRITE_SUCCESS ) {
346 Debug( LDAP_DEBUG_ANY, "Not Implemented\n", 0, 0, 0 );
351 if ( rc != REWRITE_SUCCESS ) {
352 rc = REWRITE_REGEXEC_ERR;
359 switch ( subst->lt_submatch[ n ].ls_type ) {
360 case REWRITE_SUBMATCH_ASIS:
362 rc = REWRITE_SUCCESS;
365 case REWRITE_SUBMATCH_XMAP:
366 rc = rewrite_xmap_apply( info, op,
367 subst->lt_submatch[ n ].ls_map,
368 &key, &submatch[ n ] );
373 case REWRITE_SUBMATCH_MAP_W_ARG:
374 rc = rewrite_map_apply( info, op,
375 subst->lt_submatch[ n ].ls_map,
376 &key, &submatch[ n ] );
383 * When implemented, this might return the
384 * exit status of a rewrite context,
385 * which may include a stop, or an
386 * unwilling to perform
392 if ( rc != REWRITE_SUCCESS ) {
393 rc = REWRITE_REGEXEC_ERR;
398 * Increment the length of the resulting string
400 l += submatch[ n ].bv_len;
404 * Alloc result buffer
406 l += subst->lt_subs_len;
407 res = malloc( l + 1 );
409 rc = REWRITE_REGEXEC_ERR;
414 * Apply submatches (possibly resolved thru maps)
416 for ( n = 0, cl = 0; n < subst->lt_num_submatch; n++ ) {
417 if ( subst->lt_subs[ n ].bv_val != NULL ) {
418 AC_MEMCPY( res + cl, subst->lt_subs[ n ].bv_val,
419 subst->lt_subs[ n ].bv_len );
420 cl += subst->lt_subs[ n ].bv_len;
422 AC_MEMCPY( res + cl, submatch[ n ].bv_val,
423 submatch[ n ].bv_len );
424 cl += submatch[ n ].bv_len;
426 if ( subst->lt_subs[ n ].bv_val != NULL ) {
427 AC_MEMCPY( res + cl, subst->lt_subs[ n ].bv_val,
428 subst->lt_subs[ n ].bv_len );
429 cl += subst->lt_subs[ n ].bv_len;
438 for ( ; --n >= 0; ) {
439 if ( submatch[ n ].bv_val ) {
440 free( submatch[ n ].bv_val );
453 rewrite_subst_destroy(
454 struct rewrite_subst **psubst
458 struct rewrite_subst *subst;
460 assert( psubst != NULL );
461 assert( *psubst != NULL );
465 for ( n = 0; n < subst->lt_num_submatch; n++ ) {
466 if ( subst->lt_subs[ n ].bv_val ) {
467 free( subst->lt_subs[ n ].bv_val );
468 subst->lt_subs[ n ].bv_val = NULL;
471 switch ( subst->lt_submatch[ n ].ls_type ) {
472 case REWRITE_SUBMATCH_ASIS:
475 case REWRITE_SUBMATCH_XMAP:
476 rewrite_xmap_destroy( &subst->lt_submatch[ n ].ls_map );
479 case REWRITE_SUBMATCH_MAP_W_ARG:
480 rewrite_map_destroy( &subst->lt_submatch[ n ].ls_map );
488 free( subst->lt_submatch );
489 subst->lt_submatch = NULL;
492 if ( subst->lt_subs[ n ].bv_val ) {
493 free( subst->lt_subs[ n ].bv_val );
494 subst->lt_subs[ n ].bv_val = NULL;
497 free( subst->lt_subs );
498 subst->lt_subs = NULL;