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.
25 #include <ac/socket.h>
26 #include <ac/string.h>
27 #include <ac/unistd.h>
35 static long BerRead LDAP_P(( Sockbuf *sb, char *buf, long len ));
36 static int ber_realloc LDAP_P(( BerElement *ber, unsigned long len ));
40 /* probably far too large... */
41 #define MAX_BERBUFSIZE (128*1024)
43 #if defined( DOS ) && !defined( _WIN32 ) && (MAX_BERBUFSIZE > 65535)
44 # undef MAX_BERBUFSIZE
45 # define MAX_BERBUFSIZE 65535
49 BerRead( Sockbuf *sb, char *buf, long len )
55 assert( buf != NULL );
58 if ( (c = ber_pvt_sb_read( sb, buf, len )) <= 0 ) {
72 ber_read( BerElement *ber, char *buf, unsigned long len )
74 unsigned long actuallen, nleft;
76 assert( ber != NULL );
77 assert( buf != NULL );
79 nleft = ber->ber_end - ber->ber_ptr;
80 actuallen = nleft < len ? nleft : len;
82 SAFEMEMCPY( buf, ber->ber_ptr, (size_t)actuallen );
84 ber->ber_ptr += actuallen;
86 return( (long)actuallen );
96 assert( ber != NULL );
97 assert( buf != NULL );
99 if ( nosos || ber->ber_sos == NULL ) {
100 if ( ber->ber_ptr + len > ber->ber_end ) {
101 if ( ber_realloc( ber, len ) != 0 )
104 SAFEMEMCPY( ber->ber_ptr, buf, (size_t)len );
108 if ( ber->ber_sos->sos_ptr + len > ber->ber_end ) {
109 if ( ber_realloc( ber, len ) != 0 )
112 SAFEMEMCPY( ber->ber_sos->sos_ptr, buf, (size_t)len );
113 ber->ber_sos->sos_ptr += len;
114 ber->ber_sos->sos_clen += len;
120 ber_realloc( BerElement *ber, unsigned long len )
122 unsigned long need, have, total;
127 assert( ber != NULL );
130 have = (ber->ber_end - ber->ber_buf) / EXBUFSIZ;
131 need = (len < EXBUFSIZ ? 1 : (len + (EXBUFSIZ - 1)) / EXBUFSIZ);
132 total = have * EXBUFSIZ + need * EXBUFSIZ;
134 oldbuf = ber->ber_buf;
136 if ( ber->ber_buf == NULL ) {
137 if ( (ber->ber_buf = (char *) malloc( (size_t)total )) == NULL )
139 } else if ( (ber->ber_buf = (char *) realloc( ber->ber_buf,
140 (size_t)total )) == NULL )
143 ber->ber_end = ber->ber_buf + total;
146 * If the stinking thing was moved, we need to go through and
147 * reset all the sos and ber pointers. Offsets would've been
148 * a better idea... oh well.
151 if ( ber->ber_buf != oldbuf ) {
152 ber->ber_ptr = ber->ber_buf + (ber->ber_ptr - oldbuf);
154 for ( s = ber->ber_sos; s != NULLSEQORSET; s = s->sos_next ) {
155 off = s->sos_first - oldbuf;
156 s->sos_first = ber->ber_buf + off;
158 off = s->sos_ptr - oldbuf;
159 s->sos_ptr = ber->ber_buf + off;
167 ber_free( BerElement *ber, int freebuf )
169 assert( ber != NULL );
171 if ( freebuf && ber->ber_buf != NULL )
172 free( ber->ber_buf );
174 free( (char *) ber );
178 ber_flush( Sockbuf *sb, BerElement *ber, int freeit )
180 long nwritten, towrite, rc;
182 assert( sb != NULL );
183 assert( ber != NULL );
185 if ( ber->ber_rwptr == NULL ) {
186 ber->ber_rwptr = ber->ber_buf;
188 towrite = ber->ber_ptr - ber->ber_rwptr;
190 if ( sb->sb_debug ) {
191 ber_log_printf( LDAP_DEBUG_ANY, sb->sb_debug,
192 "ber_flush: %ld bytes to sd %ld%s\n", towrite,
193 (long) sb->sb_sd, ber->ber_rwptr != ber->ber_buf ? " (re-flush)"
195 ber_log_bprint( LDAP_DEBUG_PACKETS, sb->sb_debug,
196 ber->ber_rwptr, towrite );
199 #if !defined(MACOS) && !defined(DOS)
200 if ( sb->sb_options & (LBER_TO_FILE | LBER_TO_FILE_ONLY) ) {
201 rc = write( sb->sb_fd, ber->ber_rwptr, towrite );
202 if ( sb->sb_options & LBER_TO_FILE_ONLY ) {
210 rc = ber_pvt_sb_write( sb, ber->ber_rwptr, towrite );
216 ber->ber_rwptr += rc;
217 } while ( towrite > 0 );
226 ber_alloc_t( int options )
230 ber = (BerElement *) calloc( 1, sizeof(BerElement) );
232 if ( ber == NULLBER )
235 ber->ber_tag = LBER_DEFAULT;
236 ber->ber_options = options;
237 ber->ber_debug = ber_int_debug;
243 ber_alloc( void ) /* deprecated */
245 return( ber_alloc_t( 0 ) );
249 der_alloc( void ) /* deprecated */
251 return( ber_alloc_t( LBER_USE_DER ) );
255 ber_dup( LDAP_CONST BerElement *ber )
259 assert( ber != NULL );
261 if ( (new = ber_alloc_t( ber->ber_options )) == NULL ) {
271 /* OLD U-Mich ber_init() */
273 ber_init_w_nullc( BerElement *ber, int options )
275 assert( ber != NULL );
277 (void) memset( (char *)ber, '\0', sizeof( BerElement ));
278 ber->ber_tag = LBER_DEFAULT;
279 ber->ber_options = (char) options;
280 ber->ber_debug = ber_int_debug;
283 /* New C-API ber_init() */
284 /* This function constructs a BerElement containing a copy
285 ** of the data in the bv argument.
288 ber_init( struct berval *bv )
292 assert( bv != NULL );
298 ber = ber_alloc_t( 0 );
300 if( ber == NULLBER ) {
301 /* allocation failed */
306 if ( ( (unsigned int) ber_write ( ber, bv->bv_val, bv->bv_len, 0 )) != bv->bv_len ) {
307 /* write failed, so free and return NULL */
312 ber_reset( ber, 1 ); /* reset the pointer to the start of the buffer */
317 /* New C-API ber_flatten routine */
318 /* This routine allocates a struct berval whose contents are a BER
319 ** encoding taken from the ber argument. The bvPtr pointer pointers to
320 ** the returned berval.
323 LDAP_CONST BerElement *ber,
324 struct berval **bvPtr)
328 assert( bvPtr != NULL );
334 if ( (bv = malloc( sizeof(struct berval))) == NULL ) {
339 /* ber is null, create an empty berval */
344 /* copy the berval */
345 ptrdiff_t len = ber->ber_ptr - ber->ber_buf;
347 if ( (bv->bv_val = (char *) malloc( len + 1 )) == NULL ) {
352 SAFEMEMCPY( bv->bv_val, ber->ber_buf, (size_t)len );
353 bv->bv_val[len] = '\0';
362 ber_reset( BerElement *ber, int was_writing )
364 assert( ber != NULL );
367 ber->ber_end = ber->ber_ptr;
368 ber->ber_ptr = ber->ber_buf;
370 ber->ber_ptr = ber->ber_end;
373 ber->ber_rwptr = NULL;
377 /* return the tag - LBER_DEFAULT returned means trouble */
379 get_tag( Sockbuf *sb )
386 assert( sb != NULL );
388 if ( ber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
389 return( LBER_DEFAULT );
391 if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
392 return( (unsigned long) xbyte );
394 tagp = (char *) &tag;
396 for ( i = 1; i < sizeof(long); i++ ) {
397 if ( ber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
398 return( LBER_DEFAULT );
402 if ( ! (xbyte & LBER_MORE_TAG_MASK) )
407 if ( i == sizeof(long) )
408 return( LBER_DEFAULT );
410 /* want leading, not trailing 0's */
411 return( tag >> (sizeof(long) - i - 1) );
416 * A rewrite of ber_get_next that can safely be called multiple times
417 * for the same packet. It will simply continue were it stopped until
418 * a full packet is read.
422 ber_get_next( Sockbuf *sb, unsigned long *len, BerElement *ber )
424 assert( sb != NULL );
425 assert( len != NULL );
426 assert( ber != NULL );
428 if ( ber->ber_debug ) {
429 ber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
434 * Any ber element looks like this: tag length contents.
435 * Assuming everything's ok, we return the tag byte (we
436 * can assume a single byte), return the length in len,
437 * and the rest of the undecoded element in buf.
440 * 1) small tags (less than 128)
441 * 2) definite lengths
442 * 3) primitive encodings used whenever possible
445 if (ber->ber_rwptr == NULL) {
447 * dtest does like this assert.
449 /* assert( ber->ber_buf == NULL ); */
450 ber->ber_rwptr = (char *) &ber->ber_tag;
454 #define PTR_IN_VAR( ptr, var )\
455 (((ptr)>=(char *) &(var)) && ((ptr)< (char *) &(var)+sizeof(var)))
457 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_tag)) {
458 if (ber->ber_rwptr == (char *) &ber->ber_tag) {
459 if (ber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
461 if ((ber->ber_rwptr[0] & LBER_BIG_TAG_MASK)
462 != LBER_BIG_TAG_MASK) {
463 ber->ber_tag = ber->ber_rwptr[0];
464 ber->ber_rwptr = (char *) &ber->ber_usertag;
470 /* reading the tag... */
471 if (ber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
473 if (! (ber->ber_rwptr[0] & LBER_MORE_TAG_MASK) ) {
474 ber->ber_tag>>=sizeof(ber->ber_tag) -
475 ((char *) &ber->ber_tag - ber->ber_rwptr);
476 ber->ber_rwptr = (char *) &ber->ber_usertag;
479 } while (PTR_IN_VAR(ber->ber_rwptr,ber->ber_tag));
480 errno = ERANGE; /* this is a serious error. */
484 if (ber->ber_rwptr==(char *) &ber->ber_usertag) {
486 if (ber_pvt_sb_read( sb, (char *) &c, 1)<=0)
490 if ( (len==0) || ((unsigned) len>sizeof( ber->ber_len ) ) ) {
494 ber->ber_rwptr = (char *) &ber->ber_len +
495 sizeof(ber->ber_len) - len;
502 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_len)) {
505 to_go = (char *) &ber->ber_len + sizeof( ber->ber_len ) -
508 res = ber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
511 ber->ber_rwptr += res;
513 /* convert length. */
514 ber->ber_len = AC_NTOHL( ber->ber_len );
517 #if defined( EWOULDBLOCK )
519 #elif defined( EAGAIN )
526 /* now fill the buffer. */
527 if (ber->ber_buf==NULL) {
528 if (ber->ber_len > MAX_BERBUFSIZE) {
532 ber->ber_buf = (char *) malloc( ber->ber_len );
533 if (ber->ber_buf==NULL)
535 ber->ber_rwptr = ber->ber_buf;
536 ber->ber_ptr = ber->ber_buf;
537 ber->ber_end = ber->ber_buf + ber->ber_len;
539 if ((ber->ber_rwptr>=ber->ber_buf) && (ber->ber_rwptr<ber->ber_end)) {
543 to_go = ber->ber_end - ber->ber_rwptr;
546 res = ber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
552 #if defined( EWOULDBLOCK )
554 #elif defined( EAGAIN )
560 ber->ber_rwptr = NULL;
562 if ( ber->ber_debug ) {
563 ber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
564 "ber_get_next: tag 0x%lx len %ld contents:\n",
565 ber->ber_tag, ber->ber_len );
566 ber_log_dump( LDAP_DEBUG_BER, ber->ber_debug, ber, 1 );
568 return (ber->ber_tag);
570 assert( 0 ); /* ber structure is messed up ?*/
574 void ber_clear( BerElement *ber, int freebuf )
576 assert( ber != NULL );
578 if ((freebuf) && (ber->ber_buf))
579 free( ber->ber_buf );
581 ber->ber_rwptr = NULL;