1 /* io.c - ber general i/o routines */
3 * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
4 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
7 * Copyright (c) 1990 Regents of the University of Michigan.
10 * Redistribution and use in source and binary forms are permitted
11 * provided that this notice is preserved and that due credit is given
12 * to the University of Michigan at Ann Arbor. The name of the University
13 * may not be used to endorse or promote products derived from this
14 * software without specific prior written permission. This software
15 * is provided ``as is'' without express or implied warranty.
22 #include <ac/stdlib.h>
26 #include <ac/socket.h>
27 #include <ac/string.h>
28 #include <ac/unistd.h>
35 #define LDAP_F_PRE LDAP_F_EXPORT
39 static ber_slen_t BerRead LDAP_P((
44 static int ber_realloc LDAP_P((
50 /* probably far too large... */
51 #define MAX_BERBUFSIZE (128*1024)
53 #if defined( DOS ) && !defined( _WIN32 ) && (MAX_BERBUFSIZE > 65535)
54 # undef MAX_BERBUFSIZE
55 # define MAX_BERBUFSIZE 65535
68 assert( buf != NULL );
70 assert( SOCKBUF_VALID( sb ) );
73 if ( (c = ber_pvt_sb_read( sb, buf, len )) <= 0 ) {
92 ber_len_t actuallen, nleft;
94 assert( ber != NULL );
95 assert( buf != NULL );
97 assert( BER_VALID( ber ) );
99 nleft = ber->ber_end - ber->ber_ptr;
100 actuallen = nleft < len ? nleft : len;
102 SAFEMEMCPY( buf, ber->ber_ptr, actuallen );
104 ber->ber_ptr += actuallen;
106 return( (ber_slen_t) actuallen );
112 LDAP_CONST char *buf,
116 assert( ber != NULL );
117 assert( buf != NULL );
119 assert( BER_VALID( ber ) );
121 if ( nosos || ber->ber_sos == NULL ) {
122 if ( ber->ber_ptr + len > ber->ber_end ) {
123 if ( ber_realloc( ber, len ) != 0 )
126 SAFEMEMCPY( ber->ber_ptr, buf, (size_t)len );
128 return( (ber_slen_t) len );
131 if ( ber->ber_sos->sos_ptr + len > ber->ber_end ) {
132 if ( ber_realloc( ber, len ) != 0 )
135 SAFEMEMCPY( ber->ber_sos->sos_ptr, buf, (size_t)len );
136 ber->ber_sos->sos_ptr += len;
137 ber->ber_sos->sos_clen += len;
138 return( (ber_slen_t) len );
143 ber_realloc( BerElement *ber, ber_len_t len )
145 ber_len_t need, have, total;
150 assert( ber != NULL );
153 assert( BER_VALID( ber ) );
155 have = (ber->ber_end - ber->ber_buf) / EXBUFSIZ;
156 need = (len < EXBUFSIZ ? 1 : (len + (EXBUFSIZ - 1)) / EXBUFSIZ);
157 total = have * EXBUFSIZ + need * EXBUFSIZ;
159 oldbuf = ber->ber_buf;
161 ber->ber_buf = (char *) LBER_REALLOC( ber->ber_buf, total );
163 if ( ber->ber_buf == NULL ) {
164 ber->ber_buf = oldbuf;
168 ber->ber_end = ber->ber_buf + total;
171 * If the stinking thing was moved, we need to go through and
172 * reset all the sos and ber pointers. Offsets would've been
173 * a better idea... oh well.
176 if ( ber->ber_buf != oldbuf ) {
177 ber->ber_ptr = ber->ber_buf + (ber->ber_ptr - oldbuf);
179 for ( s = ber->ber_sos; s != NULL; s = s->sos_next ) {
180 off = s->sos_first - oldbuf;
181 s->sos_first = ber->ber_buf + off;
183 off = s->sos_ptr - oldbuf;
184 s->sos_ptr = ber->ber_buf + off;
192 ber_free( BerElement *ber, int freebuf )
194 #ifdef LDAP_MEMORY_DEBUG
195 assert( ber != NULL );
202 assert( BER_VALID( ber ) );
204 if ( freebuf && ber->ber_buf != NULL )
205 LBER_FREE( ber->ber_buf );
208 ber->ber_valid = LBER_UNINITIALIZED;
210 LBER_FREE( (char *) ber );
214 ber_flush( Sockbuf *sb, BerElement *ber, int freeit )
216 ber_len_t nwritten, towrite;
219 assert( sb != NULL );
220 assert( ber != NULL );
222 assert( SOCKBUF_VALID( ber ) );
223 assert( BER_VALID( ber ) );
225 if ( ber->ber_rwptr == NULL ) {
226 ber->ber_rwptr = ber->ber_buf;
228 towrite = ber->ber_ptr - ber->ber_rwptr;
230 if ( sb->sb_debug ) {
231 ber_log_printf( LDAP_DEBUG_ANY, sb->sb_debug,
232 "ber_flush: %ld bytes to sd %ld%s\n", towrite,
233 (long) sb->sb_sd, ber->ber_rwptr != ber->ber_buf ? " (re-flush)"
235 ber_log_bprint( LDAP_DEBUG_PACKETS, sb->sb_debug,
236 ber->ber_rwptr, towrite );
240 if ( sb->sb_options & (LBER_TO_FILE | LBER_TO_FILE_ONLY) ) {
241 rc = write( sb->sb_fd, ber->ber_rwptr, towrite );
242 if ( sb->sb_options & LBER_TO_FILE_ONLY ) {
252 rc = ber_pvt_sb_write( sb, ber->ber_rwptr, towrite );
258 ber->ber_rwptr += rc;
259 } while ( towrite > 0 );
268 ber_alloc_t( int options )
272 ber_int_options.lbo_valid = LBER_INITIALIZED;
274 ber = (BerElement *) LBER_CALLOC( 1, sizeof(BerElement) );
279 ber->ber_valid = LBER_VALID_BERELEMENT;
280 ber->ber_tag = LBER_DEFAULT;
281 ber->ber_options = options;
282 ber->ber_debug = ber_int_debug;
284 assert( BER_VALID( ber ) );
289 ber_alloc( void ) /* deprecated */
291 return( ber_alloc_t( 0 ) );
295 der_alloc( void ) /* deprecated */
297 return( ber_alloc_t( LBER_USE_DER ) );
301 ber_dup( LDAP_CONST BerElement *ber )
305 assert( ber != NULL );
306 assert( BER_VALID( ber ) );
308 if ( (new = ber_alloc_t( ber->ber_options )) == NULL ) {
314 assert( BER_VALID( new ) );
319 /* OLD U-Mich ber_init() */
321 ber_init_w_nullc( BerElement *ber, int options )
323 assert( ber != NULL );
325 ber_int_options.lbo_valid = LBER_INITIALIZED;
327 (void) memset( (char *)ber, '\0', sizeof( BerElement ));
328 ber->ber_valid = LBER_VALID_BERELEMENT;
329 ber->ber_tag = LBER_DEFAULT;
330 ber->ber_options = (char) options;
331 ber->ber_debug = ber_int_debug;
333 assert( BER_VALID( ber ) );
336 /* New C-API ber_init() */
337 /* This function constructs a BerElement containing a copy
338 ** of the data in the bv argument.
341 ber_init( struct berval *bv )
345 assert( bv != NULL );
347 ber_int_options.lbo_valid = LBER_INITIALIZED;
353 ber = ber_alloc_t( 0 );
356 /* allocation failed */
361 if ( ( (ber_len_t) ber_write ( ber, bv->bv_val, bv->bv_len, 0 )) != bv->bv_len ) {
362 /* write failed, so free and return NULL */
367 ber_reset( ber, 1 ); /* reset the pointer to the start of the buffer */
372 /* New C-API ber_flatten routine */
373 /* This routine allocates a struct berval whose contents are a BER
374 ** encoding taken from the ber argument. The bvPtr pointer pointers to
375 ** the returned berval.
378 LDAP_CONST BerElement *ber,
379 struct berval **bvPtr)
383 assert( bvPtr != NULL );
385 ber_int_options.lbo_valid = LBER_INITIALIZED;
391 if ( (bv = LBER_MALLOC( sizeof(struct berval))) == NULL ) {
396 /* ber is null, create an empty berval */
401 /* copy the berval */
402 ber_len_t len = ber->ber_ptr - ber->ber_buf;
404 if ( (bv->bv_val = (char *) LBER_MALLOC( len + 1 )) == NULL ) {
409 SAFEMEMCPY( bv->bv_val, ber->ber_buf, len );
410 bv->bv_val[len] = '\0';
419 ber_reset( BerElement *ber, int was_writing )
421 assert( ber != NULL );
422 assert( BER_VALID( ber ) );
425 ber->ber_end = ber->ber_ptr;
426 ber->ber_ptr = ber->ber_buf;
428 ber->ber_ptr = ber->ber_end;
431 ber->ber_rwptr = NULL;
435 /* return the tag - LBER_DEFAULT returned means trouble */
437 get_tag( Sockbuf *sb )
444 assert( sb != NULL );
445 assert( SOCKBUF_VALID( sb ) );
447 if ( ber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
448 return( LBER_DEFAULT );
450 if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
451 return( (ber_tag_t) xbyte );
453 tagp = (char *) &tag;
455 for ( i = 1; i < sizeof(ber_tag_t); i++ ) {
456 if ( ber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
457 return( LBER_DEFAULT );
461 if ( ! (xbyte & LBER_MORE_TAG_MASK) )
466 if ( i == sizeof(ber_tag_t) )
467 return( LBER_DEFAULT );
469 /* want leading, not trailing 0's */
470 return( tag >> (sizeof(ber_tag_t) - i - 1) );
475 * A rewrite of ber_get_next that can safely be called multiple times
476 * for the same packet. It will simply continue were it stopped until
477 * a full packet is read.
486 assert( sb != NULL );
487 assert( len != NULL );
488 assert( ber != NULL );
490 assert( SOCKBUF_VALID( sb ) );
491 assert( BER_VALID( ber ) );
493 ber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
497 * Any ber element looks like this: tag length contents.
498 * Assuming everything's ok, we return the tag byte (we
499 * can assume a single byte), return the length in len,
500 * and the rest of the undecoded element in buf.
503 * 1) small tags (less than 128)
504 * 2) definite lengths
505 * 3) primitive encodings used whenever possible
508 if (ber->ber_rwptr == NULL) {
510 * dtest does like this assert.
512 /* assert( ber->ber_buf == NULL ); */
513 ber->ber_rwptr = (char *) &ber->ber_tag;
517 #define PTR_IN_VAR( ptr, var )\
518 (((ptr)>=(char *) &(var)) && ((ptr)< (char *) &(var)+sizeof(var)))
520 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_tag)) {
521 if (ber->ber_rwptr == (char *) &ber->ber_tag) {
522 if (ber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
524 if ((ber->ber_rwptr[0] & LBER_BIG_TAG_MASK)
525 != LBER_BIG_TAG_MASK) {
526 ber->ber_tag = ber->ber_rwptr[0];
527 ber->ber_rwptr = (char *) &ber->ber_usertag;
533 /* reading the tag... */
534 if (ber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
536 if (! (ber->ber_rwptr[0] & LBER_MORE_TAG_MASK) ) {
537 ber->ber_tag>>=sizeof(ber->ber_tag) -
538 ((char *) &ber->ber_tag - ber->ber_rwptr);
539 ber->ber_rwptr = (char *) &ber->ber_usertag;
542 } while (PTR_IN_VAR(ber->ber_rwptr,ber->ber_tag));
543 errno = ERANGE; /* this is a serious error. */
547 if (ber->ber_rwptr==(char *) &ber->ber_usertag) {
549 if (ber_pvt_sb_read( sb, (char *) &c, 1)<=0)
553 if ( (len==0) || ( len>sizeof( ber->ber_len ) ) ) {
557 ber->ber_rwptr = (char *) &ber->ber_len +
558 sizeof(ber->ber_len) - len;
565 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_len)) {
568 to_go = (char *) &ber->ber_len + sizeof( ber->ber_len ) -
571 res = ber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
574 ber->ber_rwptr += res;
576 /* convert length. */
577 ber->ber_len = LBER_LEN_NTOH( ber->ber_len );
580 #if defined( EWOULDBLOCK )
582 #elif defined( EAGAIN )
589 /* now fill the buffer. */
590 if (ber->ber_buf==NULL) {
591 if (ber->ber_len > MAX_BERBUFSIZE) {
595 ber->ber_buf = (char *) LBER_MALLOC( ber->ber_len );
596 if (ber->ber_buf==NULL)
598 ber->ber_rwptr = ber->ber_buf;
599 ber->ber_ptr = ber->ber_buf;
600 ber->ber_end = ber->ber_buf + ber->ber_len;
602 if ((ber->ber_rwptr>=ber->ber_buf) && (ber->ber_rwptr<ber->ber_end)) {
606 to_go = ber->ber_end - ber->ber_rwptr;
609 res = ber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
615 #if defined( EWOULDBLOCK )
617 #elif defined( EAGAIN )
623 ber->ber_rwptr = NULL;
625 if ( ber->ber_debug ) {
626 ber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
627 "ber_get_next: tag 0x%lx len %ld contents:\n",
628 ber->ber_tag, ber->ber_len );
629 ber_log_dump( LDAP_DEBUG_BER, ber->ber_debug, ber, 1 );
631 return (ber->ber_tag);
633 assert( 0 ); /* ber structure is messed up ?*/