1 /* io.c - ber general i/o routines */
4 * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
5 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
8 * Copyright (c) 1990 Regents of the University of Michigan.
11 * Redistribution and use in source and binary forms are permitted
12 * provided that this notice is preserved and that due credit is given
13 * to the University of Michigan at Ann Arbor. The name of the University
14 * may not be used to endorse or promote products derived from this
15 * software without specific prior written permission. This software
16 * is provided ``as is'' without express or implied warranty.
23 #include <ac/stdlib.h>
27 #include <ac/socket.h>
28 #include <ac/string.h>
29 #include <ac/unistd.h>
36 #define LDAP_F_PRE LDAP_F_EXPORT
40 static ber_slen_t BerRead LDAP_P((
45 static int ber_realloc LDAP_P((
51 /* probably far too large... */
52 #define MAX_BERBUFSIZE (128*1024)
54 #if defined( DOS ) && !defined( _WIN32 ) && (MAX_BERBUFSIZE > 65535)
55 # undef MAX_BERBUFSIZE
56 # define MAX_BERBUFSIZE 65535
69 assert( buf != NULL );
71 assert( SOCKBUF_VALID( sb ) );
74 if ( (c = ber_pvt_sb_read( sb, buf, len )) <= 0 ) {
93 ber_len_t actuallen, nleft;
95 assert( ber != NULL );
96 assert( buf != NULL );
98 assert( BER_VALID( ber ) );
100 nleft = ber->ber_end - ber->ber_ptr;
101 actuallen = nleft < len ? nleft : len;
103 SAFEMEMCPY( buf, ber->ber_ptr, actuallen );
105 ber->ber_ptr += actuallen;
107 return( (ber_slen_t) actuallen );
113 LDAP_CONST char *buf,
117 assert( ber != NULL );
118 assert( buf != NULL );
120 assert( BER_VALID( ber ) );
122 if ( nosos || ber->ber_sos == NULL ) {
123 if ( ber->ber_ptr + len > ber->ber_end ) {
124 if ( ber_realloc( ber, len ) != 0 )
127 SAFEMEMCPY( ber->ber_ptr, buf, (size_t)len );
129 return( (ber_slen_t) len );
132 if ( ber->ber_sos->sos_ptr + len > ber->ber_end ) {
133 if ( ber_realloc( ber, len ) != 0 )
136 SAFEMEMCPY( ber->ber_sos->sos_ptr, buf, (size_t)len );
137 ber->ber_sos->sos_ptr += len;
138 ber->ber_sos->sos_clen += len;
139 return( (ber_slen_t) len );
144 ber_realloc( BerElement *ber, ber_len_t len )
146 ber_len_t need, have, total;
151 assert( ber != NULL );
154 assert( BER_VALID( ber ) );
156 have = (ber->ber_end - ber->ber_buf) / EXBUFSIZ;
157 need = (len < EXBUFSIZ ? 1 : (len + (EXBUFSIZ - 1)) / EXBUFSIZ);
158 total = have * EXBUFSIZ + need * EXBUFSIZ;
160 oldbuf = ber->ber_buf;
162 ber->ber_buf = (char *) LBER_REALLOC( ber->ber_buf, total );
164 if ( ber->ber_buf == NULL ) {
165 ber->ber_buf = oldbuf;
169 ber->ber_end = ber->ber_buf + total;
172 * If the stinking thing was moved, we need to go through and
173 * reset all the sos and ber pointers. Offsets would've been
174 * a better idea... oh well.
177 if ( ber->ber_buf != oldbuf ) {
178 ber->ber_ptr = ber->ber_buf + (ber->ber_ptr - oldbuf);
180 for ( s = ber->ber_sos; s != NULL; s = s->sos_next ) {
181 off = s->sos_first - oldbuf;
182 s->sos_first = ber->ber_buf + off;
184 off = s->sos_ptr - oldbuf;
185 s->sos_ptr = ber->ber_buf + off;
193 ber_free( BerElement *ber, int freebuf )
195 #ifdef LDAP_MEMORY_DEBUG
196 assert( ber != NULL );
203 assert( BER_VALID( ber ) );
205 if ( freebuf && ber->ber_buf != NULL )
206 LBER_FREE( ber->ber_buf );
209 ber->ber_valid = LBER_UNINITIALIZED;
211 LBER_FREE( (char *) ber );
215 ber_flush( Sockbuf *sb, BerElement *ber, int freeit )
217 ber_len_t nwritten, towrite;
220 assert( sb != NULL );
221 assert( ber != NULL );
223 assert( SOCKBUF_VALID( ber ) );
224 assert( BER_VALID( ber ) );
226 if ( ber->ber_rwptr == NULL ) {
227 ber->ber_rwptr = ber->ber_buf;
229 towrite = ber->ber_ptr - ber->ber_rwptr;
231 if ( sb->sb_debug ) {
232 ber_log_printf( LDAP_DEBUG_ANY, sb->sb_debug,
233 "ber_flush: %ld bytes to sd %ld%s\n", towrite,
234 (long) sb->sb_sd, ber->ber_rwptr != ber->ber_buf ? " (re-flush)"
236 ber_log_bprint( LDAP_DEBUG_PACKETS, sb->sb_debug,
237 ber->ber_rwptr, towrite );
241 if ( sb->sb_options & (LBER_TO_FILE | LBER_TO_FILE_ONLY) ) {
242 rc = write( sb->sb_fd, ber->ber_rwptr, towrite );
243 if ( sb->sb_options & LBER_TO_FILE_ONLY ) {
253 rc = ber_pvt_sb_write( sb, ber->ber_rwptr, towrite );
259 ber->ber_rwptr += rc;
260 } while ( towrite > 0 );
269 ber_alloc_t( int options )
273 ber_int_options.lbo_valid = LBER_INITIALIZED;
275 ber = (BerElement *) LBER_CALLOC( 1, sizeof(BerElement) );
280 ber->ber_valid = LBER_VALID_BERELEMENT;
281 ber->ber_tag = LBER_DEFAULT;
282 ber->ber_options = options;
283 ber->ber_debug = ber_int_debug;
285 assert( BER_VALID( ber ) );
290 ber_alloc( void ) /* deprecated */
292 return( ber_alloc_t( 0 ) );
296 der_alloc( void ) /* deprecated */
298 return( ber_alloc_t( LBER_USE_DER ) );
302 ber_dup( LDAP_CONST BerElement *ber )
306 assert( ber != NULL );
307 assert( BER_VALID( ber ) );
309 if ( (new = ber_alloc_t( ber->ber_options )) == NULL ) {
315 assert( BER_VALID( new ) );
320 /* OLD U-Mich ber_init() */
322 ber_init_w_nullc( BerElement *ber, int options )
324 assert( ber != NULL );
326 ber_int_options.lbo_valid = LBER_INITIALIZED;
328 (void) memset( (char *)ber, '\0', sizeof( BerElement ));
329 ber->ber_valid = LBER_VALID_BERELEMENT;
330 ber->ber_tag = LBER_DEFAULT;
331 ber->ber_options = (char) options;
332 ber->ber_debug = ber_int_debug;
334 assert( BER_VALID( ber ) );
337 /* New C-API ber_init() */
338 /* This function constructs a BerElement containing a copy
339 ** of the data in the bv argument.
342 ber_init( struct berval *bv )
346 assert( bv != NULL );
348 ber_int_options.lbo_valid = LBER_INITIALIZED;
354 ber = ber_alloc_t( 0 );
357 /* allocation failed */
362 if ( ( (ber_len_t) ber_write ( ber, bv->bv_val, bv->bv_len, 0 )) != bv->bv_len ) {
363 /* write failed, so free and return NULL */
368 ber_reset( ber, 1 ); /* reset the pointer to the start of the buffer */
373 /* New C-API ber_flatten routine */
374 /* This routine allocates a struct berval whose contents are a BER
375 ** encoding taken from the ber argument. The bvPtr pointer pointers to
376 ** the returned berval.
379 LDAP_CONST BerElement *ber,
380 struct berval **bvPtr)
384 assert( bvPtr != NULL );
386 ber_int_options.lbo_valid = LBER_INITIALIZED;
392 if ( (bv = LBER_MALLOC( sizeof(struct berval))) == NULL ) {
397 /* ber is null, create an empty berval */
402 /* copy the berval */
403 ber_len_t len = ber->ber_ptr - ber->ber_buf;
405 if ( (bv->bv_val = (char *) LBER_MALLOC( len + 1 )) == NULL ) {
410 SAFEMEMCPY( bv->bv_val, ber->ber_buf, len );
411 bv->bv_val[len] = '\0';
420 ber_reset( BerElement *ber, int was_writing )
422 assert( ber != NULL );
423 assert( BER_VALID( ber ) );
426 ber->ber_end = ber->ber_ptr;
427 ber->ber_ptr = ber->ber_buf;
429 ber->ber_ptr = ber->ber_end;
432 ber->ber_rwptr = NULL;
436 /* return the tag - LBER_DEFAULT returned means trouble */
438 get_tag( Sockbuf *sb )
445 assert( sb != NULL );
446 assert( SOCKBUF_VALID( sb ) );
448 if ( ber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
449 return( LBER_DEFAULT );
451 if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
452 return( (ber_tag_t) xbyte );
454 tagp = (char *) &tag;
456 for ( i = 1; i < sizeof(ber_tag_t); i++ ) {
457 if ( ber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
458 return( LBER_DEFAULT );
462 if ( ! (xbyte & LBER_MORE_TAG_MASK) )
467 if ( i == sizeof(ber_tag_t) )
468 return( LBER_DEFAULT );
470 /* want leading, not trailing 0's */
471 return( tag >> (sizeof(ber_tag_t) - i - 1) );
476 * A rewrite of ber_get_next that can safely be called multiple times
477 * for the same packet. It will simply continue were it stopped until
478 * a full packet is read.
487 assert( sb != NULL );
488 assert( len != NULL );
489 assert( ber != NULL );
491 assert( SOCKBUF_VALID( sb ) );
492 assert( BER_VALID( ber ) );
494 ber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
498 * Any ber element looks like this: tag length contents.
499 * Assuming everything's ok, we return the tag byte (we
500 * can assume a single byte), return the length in len,
501 * and the rest of the undecoded element in buf.
504 * 1) small tags (less than 128)
505 * 2) definite lengths
506 * 3) primitive encodings used whenever possible
509 if (ber->ber_rwptr == NULL) {
511 * dtest does like this assert.
513 /* assert( ber->ber_buf == NULL ); */
514 ber->ber_rwptr = (char *) &ber->ber_tag;
518 #define PTR_IN_VAR( ptr, var )\
519 (((ptr)>=(char *) &(var)) && ((ptr)< (char *) &(var)+sizeof(var)))
521 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_tag)) {
522 if (ber->ber_rwptr == (char *) &ber->ber_tag) {
523 if (ber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
525 if ((ber->ber_rwptr[0] & LBER_BIG_TAG_MASK)
526 != LBER_BIG_TAG_MASK) {
527 ber->ber_tag = ber->ber_rwptr[0];
528 ber->ber_rwptr = (char *) &ber->ber_usertag;
534 /* reading the tag... */
535 if (ber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
537 if (! (ber->ber_rwptr[0] & LBER_MORE_TAG_MASK) ) {
538 ber->ber_tag>>=sizeof(ber->ber_tag) -
539 ((char *) &ber->ber_tag - ber->ber_rwptr);
540 ber->ber_rwptr = (char *) &ber->ber_usertag;
543 } while (PTR_IN_VAR(ber->ber_rwptr,ber->ber_tag));
544 errno = ERANGE; /* this is a serious error. */
548 if (ber->ber_rwptr==(char *) &ber->ber_usertag) {
550 if (ber_pvt_sb_read( sb, (char *) &c, 1)<=0)
554 if ( (len==0) || ( len>sizeof( ber->ber_len ) ) ) {
558 ber->ber_rwptr = (char *) &ber->ber_len +
559 sizeof(ber->ber_len) - len;
566 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_len)) {
569 to_go = (char *) &ber->ber_len + sizeof( ber->ber_len ) -
572 res = ber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
575 ber->ber_rwptr += res;
577 /* convert length. */
578 ber->ber_len = LBER_LEN_NTOH( ber->ber_len );
581 #if defined( EWOULDBLOCK )
583 #elif defined( EAGAIN )
590 /* now fill the buffer. */
591 if (ber->ber_buf==NULL) {
592 if (ber->ber_len > MAX_BERBUFSIZE) {
596 ber->ber_buf = (char *) LBER_MALLOC( ber->ber_len );
597 if (ber->ber_buf==NULL)
599 ber->ber_rwptr = ber->ber_buf;
600 ber->ber_ptr = ber->ber_buf;
601 ber->ber_end = ber->ber_buf + ber->ber_len;
603 if ((ber->ber_rwptr>=ber->ber_buf) && (ber->ber_rwptr<ber->ber_end)) {
607 to_go = ber->ber_end - ber->ber_rwptr;
610 res = ber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
616 #if defined( EWOULDBLOCK )
618 #elif defined( EAGAIN )
624 ber->ber_rwptr = NULL;
626 if ( ber->ber_debug ) {
627 ber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
628 "ber_get_next: tag 0x%lx len %ld contents:\n",
629 ber->ber_tag, ber->ber_len );
630 ber_log_dump( LDAP_DEBUG_BER, ber->ber_debug, ber, 1 );
632 return (ber->ber_tag);
634 assert( 0 ); /* ber structure is messed up ?*/