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>
37 static ber_slen_t BerRead LDAP_P((
42 static int ber_realloc LDAP_P((
48 /* probably far too large... */
49 #define MAX_BERBUFSIZE (128*1024)
51 #if defined( DOS ) && !defined( _WIN32 ) && (MAX_BERBUFSIZE > 65535)
52 # undef MAX_BERBUFSIZE
53 # define MAX_BERBUFSIZE 65535
66 assert( buf != NULL );
68 assert( SOCKBUF_VALID( sb ) );
71 if ( (c = ber_pvt_sb_read( sb, buf, len )) <= 0 ) {
90 ber_len_t actuallen, nleft;
92 assert( ber != NULL );
93 assert( buf != NULL );
95 assert( BER_VALID( ber ) );
97 nleft = ber->ber_end - ber->ber_ptr;
98 actuallen = nleft < len ? nleft : len;
100 SAFEMEMCPY( buf, ber->ber_ptr, actuallen );
102 ber->ber_ptr += actuallen;
104 return( (ber_slen_t) actuallen );
110 LDAP_CONST char *buf,
114 assert( ber != NULL );
115 assert( buf != NULL );
117 assert( BER_VALID( ber ) );
119 if ( nosos || ber->ber_sos == NULL ) {
120 if ( ber->ber_ptr + len > ber->ber_end ) {
121 if ( ber_realloc( ber, len ) != 0 )
124 SAFEMEMCPY( ber->ber_ptr, buf, (size_t)len );
126 return( (ber_slen_t) len );
129 if ( ber->ber_sos->sos_ptr + len > ber->ber_end ) {
130 if ( ber_realloc( ber, len ) != 0 )
133 SAFEMEMCPY( ber->ber_sos->sos_ptr, buf, (size_t)len );
134 ber->ber_sos->sos_ptr += len;
135 ber->ber_sos->sos_clen += len;
136 return( (ber_slen_t) len );
141 ber_realloc( BerElement *ber, ber_len_t len )
143 ber_len_t need, have, total;
148 assert( ber != NULL );
151 assert( BER_VALID( ber ) );
153 have = (ber->ber_end - ber->ber_buf) / EXBUFSIZ;
154 need = (len < EXBUFSIZ ? 1 : (len + (EXBUFSIZ - 1)) / EXBUFSIZ);
155 total = have * EXBUFSIZ + need * EXBUFSIZ;
157 oldbuf = ber->ber_buf;
159 ber->ber_buf = (char *) LBER_REALLOC( ber->ber_buf, total );
161 if ( ber->ber_buf == NULL ) {
162 ber->ber_buf = oldbuf;
166 ber->ber_end = ber->ber_buf + total;
169 * If the stinking thing was moved, we need to go through and
170 * reset all the sos and ber pointers. Offsets would've been
171 * a better idea... oh well.
174 if ( ber->ber_buf != oldbuf ) {
175 ber->ber_ptr = ber->ber_buf + (ber->ber_ptr - oldbuf);
177 for ( s = ber->ber_sos; s != NULL; s = s->sos_next ) {
178 off = s->sos_first - oldbuf;
179 s->sos_first = ber->ber_buf + off;
181 off = s->sos_ptr - oldbuf;
182 s->sos_ptr = ber->ber_buf + off;
190 ber_free( BerElement *ber, int freebuf )
192 #ifdef LDAP_MEMORY_DEBUG
193 assert( ber != NULL );
200 assert( BER_VALID( ber ) );
204 LBER_FREE( ber->ber_buf );
206 for( s = ber->ber_sos ; s != NULL ; s = next ) {
214 ber->ber_valid = LBER_UNINITIALIZED;
216 LBER_FREE( (char *) ber );
220 ber_flush( Sockbuf *sb, BerElement *ber, int freeit )
222 ber_len_t nwritten, towrite;
225 assert( sb != NULL );
226 assert( ber != NULL );
228 assert( SOCKBUF_VALID( ber ) );
229 assert( BER_VALID( ber ) );
231 if ( ber->ber_rwptr == NULL ) {
232 ber->ber_rwptr = ber->ber_buf;
234 towrite = ber->ber_ptr - ber->ber_rwptr;
236 if ( sb->sb_debug ) {
237 ber_log_printf( LDAP_DEBUG_ANY, sb->sb_debug,
238 "ber_flush: %ld bytes to sd %ld%s\n", towrite,
239 (long) sb->sb_sd, ber->ber_rwptr != ber->ber_buf ? " (re-flush)"
241 ber_log_bprint( LDAP_DEBUG_PACKETS, sb->sb_debug,
242 ber->ber_rwptr, towrite );
246 if ( sb->sb_options & (LBER_TO_FILE | LBER_TO_FILE_ONLY) ) {
247 rc = write( sb->sb_fd, ber->ber_rwptr, towrite );
248 if ( sb->sb_options & LBER_TO_FILE_ONLY ) {
258 rc = ber_pvt_sb_write( sb, ber->ber_rwptr, towrite );
264 ber->ber_rwptr += rc;
265 } while ( towrite > 0 );
274 ber_alloc_t( int options )
278 ber_int_options.lbo_valid = LBER_INITIALIZED;
280 ber = (BerElement *) LBER_CALLOC( 1, sizeof(BerElement) );
285 ber->ber_valid = LBER_VALID_BERELEMENT;
286 ber->ber_tag = LBER_DEFAULT;
287 ber->ber_options = options;
288 ber->ber_debug = ber_int_debug;
290 assert( BER_VALID( ber ) );
295 ber_alloc( void ) /* deprecated */
297 return( ber_alloc_t( 0 ) );
301 der_alloc( void ) /* deprecated */
303 return( ber_alloc_t( LBER_USE_DER ) );
307 ber_dup( BerElement *ber )
311 assert( ber != NULL );
312 assert( BER_VALID( ber ) );
314 if ( (new = ber_alloc_t( ber->ber_options )) == NULL ) {
320 assert( BER_VALID( new ) );
325 /* OLD U-Mich ber_init() */
327 ber_init_w_nullc( BerElement *ber, int options )
329 assert( ber != NULL );
331 ber_int_options.lbo_valid = LBER_INITIALIZED;
333 (void) memset( (char *)ber, '\0', sizeof( BerElement ));
334 ber->ber_valid = LBER_VALID_BERELEMENT;
335 ber->ber_tag = LBER_DEFAULT;
336 ber->ber_options = (char) options;
337 ber->ber_debug = ber_int_debug;
339 assert( BER_VALID( ber ) );
342 /* New C-API ber_init() */
343 /* This function constructs a BerElement containing a copy
344 ** of the data in the bv argument.
347 ber_init( struct berval *bv )
351 assert( bv != NULL );
353 ber_int_options.lbo_valid = LBER_INITIALIZED;
359 ber = ber_alloc_t( 0 );
362 /* allocation failed */
367 if ( ( (ber_len_t) ber_write ( ber, bv->bv_val, bv->bv_len, 0 )) != bv->bv_len ) {
368 /* write failed, so free and return NULL */
373 ber_reset( ber, 1 ); /* reset the pointer to the start of the buffer */
378 /* New C-API ber_flatten routine */
379 /* This routine allocates a struct berval whose contents are a BER
380 ** encoding taken from the ber argument. The bvPtr pointer pointers to
381 ** the returned berval.
385 struct berval **bvPtr)
389 assert( bvPtr != NULL );
391 ber_int_options.lbo_valid = LBER_INITIALIZED;
397 if ( (bv = LBER_MALLOC( sizeof(struct berval))) == NULL ) {
402 /* ber is null, create an empty berval */
407 /* copy the berval */
408 ber_len_t len = ber->ber_ptr - ber->ber_buf;
410 if ( (bv->bv_val = (char *) LBER_MALLOC( len + 1 )) == NULL ) {
415 SAFEMEMCPY( bv->bv_val, ber->ber_buf, len );
416 bv->bv_val[len] = '\0';
425 ber_reset( BerElement *ber, int was_writing )
427 assert( ber != NULL );
428 assert( BER_VALID( ber ) );
431 ber->ber_end = ber->ber_ptr;
432 ber->ber_ptr = ber->ber_buf;
434 ber->ber_ptr = ber->ber_end;
437 ber->ber_rwptr = NULL;
441 /* return the tag - LBER_DEFAULT returned means trouble */
443 get_tag( Sockbuf *sb )
450 assert( sb != NULL );
451 assert( SOCKBUF_VALID( sb ) );
453 if ( ber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
454 return( LBER_DEFAULT );
456 if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
457 return( (ber_tag_t) xbyte );
459 tagp = (char *) &tag;
461 for ( i = 1; i < sizeof(ber_tag_t); i++ ) {
462 if ( ber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
463 return( LBER_DEFAULT );
467 if ( ! (xbyte & LBER_MORE_TAG_MASK) )
472 if ( i == sizeof(ber_tag_t) )
473 return( LBER_DEFAULT );
475 /* want leading, not trailing 0's */
476 return( tag >> (sizeof(ber_tag_t) - i - 1) );
481 * A rewrite of ber_get_next that can safely be called multiple times
482 * for the same packet. It will simply continue were it stopped until
483 * a full packet is read.
492 assert( sb != NULL );
493 assert( len != NULL );
494 assert( ber != NULL );
496 assert( SOCKBUF_VALID( sb ) );
497 assert( BER_VALID( ber ) );
499 ber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
503 * Any ber element looks like this: tag length contents.
504 * Assuming everything's ok, we return the tag byte (we
505 * can assume a single byte), return the length in len,
506 * and the rest of the undecoded element in buf.
509 * 1) small tags (less than 128)
510 * 2) definite lengths
511 * 3) primitive encodings used whenever possible
514 if (ber->ber_rwptr == NULL) {
516 * dtest does like this assert.
518 /* assert( ber->ber_buf == NULL ); */
519 ber->ber_rwptr = (char *) &ber->ber_tag;
524 #define PTR_IN_VAR( ptr, var ) \
525 (((ptr)>=(char *) &(var)) && ((ptr)< (char *) &(var)+sizeof(var)))
527 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_tag)) {
528 if (ber->ber_rwptr == (char *) &ber->ber_tag) {
529 if (ber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
531 if ((ber->ber_rwptr[0] & LBER_BIG_TAG_MASK)
532 != LBER_BIG_TAG_MASK) {
533 ber->ber_tag = ber->ber_rwptr[0];
534 ber->ber_rwptr = (char *) &ber->ber_usertag;
540 /* reading the tag... */
541 if (ber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
543 if (! (ber->ber_rwptr[0] & LBER_MORE_TAG_MASK) ) {
544 ber->ber_tag>>=sizeof(ber->ber_tag) -
545 ((char *) &ber->ber_tag - ber->ber_rwptr);
546 ber->ber_rwptr = (char *) &ber->ber_usertag;
549 } while( PTR_IN_VAR(ber->ber_rwptr, ber->ber_tag ));
550 errno = ERANGE; /* this is a serious error. */
555 if (ber->ber_rwptr==(char *) &ber->ber_usertag) {
557 if (ber_pvt_sb_read( sb, (char *) &c, 1)<=0)
561 if ( (len==0) || ( len>sizeof( ber->ber_len ) ) ) {
565 ber->ber_rwptr = (char *) &ber->ber_len +
566 sizeof(ber->ber_len) - len;
574 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_len)) {
575 unsigned char netlen[sizeof(ber_len_t)];
579 to_go = (char *) &ber->ber_len + sizeof( ber->ber_len ) -
582 res = ber_pvt_sb_read( sb, netlen, to_go );
586 ber->ber_rwptr += res;
589 /* convert length. */
591 for( to_go = 0; to_go < res ; to_go++ ) {
593 ber->ber_len |= netlen[to_go];
597 #if defined( EWOULDBLOCK )
599 #elif defined( EAGAIN )
607 /* now fill the buffer. */
608 if (ber->ber_buf==NULL) {
609 if (ber->ber_len > MAX_BERBUFSIZE) {
613 ber->ber_buf = (char *) LBER_MALLOC( ber->ber_len );
614 if (ber->ber_buf==NULL)
616 ber->ber_rwptr = ber->ber_buf;
617 ber->ber_ptr = ber->ber_buf;
618 ber->ber_end = ber->ber_buf + ber->ber_len;
621 if ((ber->ber_rwptr>=ber->ber_buf) && (ber->ber_rwptr<ber->ber_end)) {
625 to_go = ber->ber_end - ber->ber_rwptr;
628 res = ber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
634 #if defined( EWOULDBLOCK )
636 #elif defined( EAGAIN )
642 ber->ber_rwptr = NULL;
644 if ( ber->ber_debug ) {
645 ber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
646 "ber_get_next: tag 0x%lx len %ld contents:\n",
647 ber->ber_tag, ber->ber_len );
648 ber_log_dump( LDAP_DEBUG_BER, ber->ber_debug, ber, 1 );
650 return (ber->ber_tag);
652 assert( 0 ); /* ber structure is messed up ?*/