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>
36 static long BerRead LDAP_P(( Sockbuf *sb, char *buf, long len ));
37 static int ber_realloc LDAP_P(( BerElement *ber, unsigned long len ));
41 /* probably far too large... */
42 #define MAX_BERBUFSIZE (128*1024)
44 #if defined( DOS ) && !defined( _WIN32 ) && (MAX_BERBUFSIZE > 65535)
45 # undef MAX_BERBUFSIZE
46 # define MAX_BERBUFSIZE 65535
50 BerRead( Sockbuf *sb, char *buf, long len )
56 assert( buf != NULL );
58 assert( SOCKBUF_VALID( sb ) );
61 if ( (c = ber_pvt_sb_read( sb, buf, len )) <= 0 ) {
75 ber_read( BerElement *ber, char *buf, unsigned long len )
77 unsigned long actuallen, nleft;
79 assert( ber != NULL );
80 assert( buf != NULL );
82 assert( BER_VALID( ber ) );
84 nleft = ber->ber_end - ber->ber_ptr;
85 actuallen = nleft < len ? nleft : len;
87 SAFEMEMCPY( buf, ber->ber_ptr, (size_t)actuallen );
89 ber->ber_ptr += actuallen;
91 return( (long)actuallen );
101 assert( ber != NULL );
102 assert( buf != NULL );
104 assert( BER_VALID( ber ) );
106 if ( nosos || ber->ber_sos == NULL ) {
107 if ( ber->ber_ptr + len > ber->ber_end ) {
108 if ( ber_realloc( ber, len ) != 0 )
111 SAFEMEMCPY( ber->ber_ptr, buf, (size_t)len );
115 if ( ber->ber_sos->sos_ptr + len > ber->ber_end ) {
116 if ( ber_realloc( ber, len ) != 0 )
119 SAFEMEMCPY( ber->ber_sos->sos_ptr, buf, (size_t)len );
120 ber->ber_sos->sos_ptr += len;
121 ber->ber_sos->sos_clen += len;
127 ber_realloc( BerElement *ber, unsigned long len )
129 unsigned long need, have, total;
134 assert( ber != NULL );
137 assert( BER_VALID( ber ) );
139 have = (ber->ber_end - ber->ber_buf) / EXBUFSIZ;
140 need = (len < EXBUFSIZ ? 1 : (len + (EXBUFSIZ - 1)) / EXBUFSIZ);
141 total = have * EXBUFSIZ + need * EXBUFSIZ;
143 oldbuf = ber->ber_buf;
145 ber->ber_buf = (char *) LBER_REALLOC( ber->ber_buf, total );
147 if ( ber->ber_buf == NULL ) {
148 ber->ber_buf = oldbuf;
152 ber->ber_end = ber->ber_buf + total;
155 * If the stinking thing was moved, we need to go through and
156 * reset all the sos and ber pointers. Offsets would've been
157 * a better idea... oh well.
160 if ( ber->ber_buf != oldbuf ) {
161 ber->ber_ptr = ber->ber_buf + (ber->ber_ptr - oldbuf);
163 for ( s = ber->ber_sos; s != NULLSEQORSET; s = s->sos_next ) {
164 off = s->sos_first - oldbuf;
165 s->sos_first = ber->ber_buf + off;
167 off = s->sos_ptr - oldbuf;
168 s->sos_ptr = ber->ber_buf + off;
176 ber_free( BerElement *ber, int freebuf )
178 assert( ber != NULL );
179 assert( BER_VALID( ber ) );
181 if ( freebuf && ber->ber_buf != NULL )
182 LBER_FREE( ber->ber_buf );
185 ber->ber_valid = LBER_UNINITIALIZED;
187 LBER_FREE( (char *) ber );
191 ber_flush( Sockbuf *sb, BerElement *ber, int freeit )
193 long nwritten, towrite, rc;
195 assert( sb != NULL );
196 assert( ber != NULL );
198 assert( SOCKBUF_VALID( ber ) );
199 assert( BER_VALID( ber ) );
201 if ( ber->ber_rwptr == NULL ) {
202 ber->ber_rwptr = ber->ber_buf;
204 towrite = ber->ber_ptr - ber->ber_rwptr;
206 if ( sb->sb_debug ) {
207 ber_log_printf( LDAP_DEBUG_ANY, sb->sb_debug,
208 "ber_flush: %ld bytes to sd %ld%s\n", towrite,
209 (long) sb->sb_sd, ber->ber_rwptr != ber->ber_buf ? " (re-flush)"
211 ber_log_bprint( LDAP_DEBUG_PACKETS, sb->sb_debug,
212 ber->ber_rwptr, towrite );
215 #if !defined(MACOS) && !defined(DOS)
216 if ( sb->sb_options & (LBER_TO_FILE | LBER_TO_FILE_ONLY) ) {
217 rc = write( sb->sb_fd, ber->ber_rwptr, towrite );
218 if ( sb->sb_options & LBER_TO_FILE_ONLY ) {
226 rc = ber_pvt_sb_write( sb, ber->ber_rwptr, towrite );
232 ber->ber_rwptr += rc;
233 } while ( towrite > 0 );
242 ber_alloc_t( int options )
246 ber_int_options.lbo_valid = LBER_INITIALIZED;
248 ber = (BerElement *) LBER_CALLOC( 1, sizeof(BerElement) );
250 if ( ber == NULLBER )
253 ber->ber_valid = LBER_VALID_BERELEMENT;
254 ber->ber_tag = LBER_DEFAULT;
255 ber->ber_options = options;
256 ber->ber_debug = ber_int_debug;
258 assert( BER_VALID( ber ) );
263 ber_alloc( void ) /* deprecated */
265 return( ber_alloc_t( 0 ) );
269 der_alloc( void ) /* deprecated */
271 return( ber_alloc_t( LBER_USE_DER ) );
275 ber_dup( LDAP_CONST BerElement *ber )
279 assert( ber != NULL );
280 assert( BER_VALID( ber ) );
282 if ( (new = ber_alloc_t( ber->ber_options )) == NULL ) {
288 assert( BER_VALID( new ) );
293 /* OLD U-Mich ber_init() */
295 ber_init_w_nullc( BerElement *ber, int options )
297 assert( ber != NULL );
299 ber_int_options.lbo_valid = LBER_INITIALIZED;
301 (void) memset( (char *)ber, '\0', sizeof( BerElement ));
302 ber->ber_valid = LBER_VALID_BERELEMENT;
303 ber->ber_tag = LBER_DEFAULT;
304 ber->ber_options = (char) options;
305 ber->ber_debug = ber_int_debug;
307 assert( BER_VALID( ber ) );
310 /* New C-API ber_init() */
311 /* This function constructs a BerElement containing a copy
312 ** of the data in the bv argument.
315 ber_init( struct berval *bv )
319 assert( bv != NULL );
321 ber_int_options.lbo_valid = LBER_INITIALIZED;
327 ber = ber_alloc_t( 0 );
329 if( ber == NULLBER ) {
330 /* allocation failed */
335 if ( ( (unsigned int) ber_write ( ber, bv->bv_val, bv->bv_len, 0 )) != bv->bv_len ) {
336 /* write failed, so free and return NULL */
341 ber_reset( ber, 1 ); /* reset the pointer to the start of the buffer */
346 /* New C-API ber_flatten routine */
347 /* This routine allocates a struct berval whose contents are a BER
348 ** encoding taken from the ber argument. The bvPtr pointer pointers to
349 ** the returned berval.
352 LDAP_CONST BerElement *ber,
353 struct berval **bvPtr)
357 assert( bvPtr != NULL );
359 ber_int_options.lbo_valid = LBER_INITIALIZED;
365 if ( (bv = LBER_MALLOC( sizeof(struct berval))) == NULL ) {
370 /* ber is null, create an empty berval */
375 /* copy the berval */
376 ptrdiff_t len = ber->ber_ptr - ber->ber_buf;
378 if ( (bv->bv_val = (char *) LBER_MALLOC( len + 1 )) == NULL ) {
383 SAFEMEMCPY( bv->bv_val, ber->ber_buf, (size_t)len );
384 bv->bv_val[len] = '\0';
393 ber_reset( BerElement *ber, int was_writing )
395 assert( ber != NULL );
396 assert( BER_VALID( ber ) );
399 ber->ber_end = ber->ber_ptr;
400 ber->ber_ptr = ber->ber_buf;
402 ber->ber_ptr = ber->ber_end;
405 ber->ber_rwptr = NULL;
409 /* return the tag - LBER_DEFAULT returned means trouble */
411 get_tag( Sockbuf *sb )
418 assert( sb != NULL );
419 assert( SOCKBUF_VALID( sb ) );
421 if ( ber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
422 return( LBER_DEFAULT );
424 if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
425 return( (unsigned long) xbyte );
427 tagp = (char *) &tag;
429 for ( i = 1; i < sizeof(long); i++ ) {
430 if ( ber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
431 return( LBER_DEFAULT );
435 if ( ! (xbyte & LBER_MORE_TAG_MASK) )
440 if ( i == sizeof(long) )
441 return( LBER_DEFAULT );
443 /* want leading, not trailing 0's */
444 return( tag >> (sizeof(long) - i - 1) );
449 * A rewrite of ber_get_next that can safely be called multiple times
450 * for the same packet. It will simply continue were it stopped until
451 * a full packet is read.
455 ber_get_next( Sockbuf *sb, unsigned long *len, BerElement *ber )
457 assert( sb != NULL );
458 assert( len != NULL );
459 assert( ber != NULL );
461 assert( SOCKBUF_VALID( sb ) );
462 assert( BER_VALID( ber ) );
464 ber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
468 * Any ber element looks like this: tag length contents.
469 * Assuming everything's ok, we return the tag byte (we
470 * can assume a single byte), return the length in len,
471 * and the rest of the undecoded element in buf.
474 * 1) small tags (less than 128)
475 * 2) definite lengths
476 * 3) primitive encodings used whenever possible
479 if (ber->ber_rwptr == NULL) {
481 * dtest does like this assert.
483 /* assert( ber->ber_buf == NULL ); */
484 ber->ber_rwptr = (char *) &ber->ber_tag;
488 #define PTR_IN_VAR( ptr, var )\
489 (((ptr)>=(char *) &(var)) && ((ptr)< (char *) &(var)+sizeof(var)))
491 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_tag)) {
492 if (ber->ber_rwptr == (char *) &ber->ber_tag) {
493 if (ber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
495 if ((ber->ber_rwptr[0] & LBER_BIG_TAG_MASK)
496 != LBER_BIG_TAG_MASK) {
497 ber->ber_tag = ber->ber_rwptr[0];
498 ber->ber_rwptr = (char *) &ber->ber_usertag;
504 /* reading the tag... */
505 if (ber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
507 if (! (ber->ber_rwptr[0] & LBER_MORE_TAG_MASK) ) {
508 ber->ber_tag>>=sizeof(ber->ber_tag) -
509 ((char *) &ber->ber_tag - ber->ber_rwptr);
510 ber->ber_rwptr = (char *) &ber->ber_usertag;
513 } while (PTR_IN_VAR(ber->ber_rwptr,ber->ber_tag));
514 errno = ERANGE; /* this is a serious error. */
518 if (ber->ber_rwptr==(char *) &ber->ber_usertag) {
520 if (ber_pvt_sb_read( sb, (char *) &c, 1)<=0)
524 if ( (len==0) || ((unsigned) len>sizeof( ber->ber_len ) ) ) {
528 ber->ber_rwptr = (char *) &ber->ber_len +
529 sizeof(ber->ber_len) - len;
536 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_len)) {
539 to_go = (char *) &ber->ber_len + sizeof( ber->ber_len ) -
542 res = ber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
545 ber->ber_rwptr += res;
547 /* convert length. */
548 ber->ber_len = AC_NTOHL( ber->ber_len );
551 #if defined( EWOULDBLOCK )
553 #elif defined( EAGAIN )
560 /* now fill the buffer. */
561 if (ber->ber_buf==NULL) {
562 if (ber->ber_len > MAX_BERBUFSIZE) {
566 ber->ber_buf = (char *) LBER_MALLOC( ber->ber_len );
567 if (ber->ber_buf==NULL)
569 ber->ber_rwptr = ber->ber_buf;
570 ber->ber_ptr = ber->ber_buf;
571 ber->ber_end = ber->ber_buf + ber->ber_len;
573 if ((ber->ber_rwptr>=ber->ber_buf) && (ber->ber_rwptr<ber->ber_end)) {
577 to_go = ber->ber_end - ber->ber_rwptr;
580 res = ber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
586 #if defined( EWOULDBLOCK )
588 #elif defined( EAGAIN )
594 ber->ber_rwptr = NULL;
596 if ( ber->ber_debug ) {
597 ber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
598 "ber_get_next: tag 0x%lx len %ld contents:\n",
599 ber->ber_tag, ber->ber_len );
600 ber_log_dump( LDAP_DEBUG_BER, ber->ber_debug, ber, 1 );
602 return (ber->ber_tag);
604 assert( 0 ); /* ber structure is messed up ?*/