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 int ber_realloc LDAP_P(( BerElement *ber, unsigned long len ));
36 static int ber_filbuf LDAP_P(( Sockbuf *sb, long len ));
37 static long BerRead LDAP_P(( Sockbuf *sb, char *buf, long len ));
39 static int BerWrite LDAP_P(( Sockbuf *sb, char *buf, long len ));
42 #define bergetc( sb, len ) ( sb->sb_ber.ber_end > sb->sb_ber.ber_ptr ? \
43 (unsigned char)*sb->sb_ber.ber_ptr++ : \
44 ber_filbuf( sb, len ))
48 * MacTCP/OpenTransport
50 #define read( s, b, l ) tcpread( s, 0, (unsigned char *)b, l, NULL )
51 #define MAX_WRITE 65535
52 #define BerWrite( sb, b, l ) tcpwrite( sb->sb_sd, (unsigned char *)(b), (l<MAX_WRITE)? l : MAX_WRITE )
59 #define read( s, b, l ) recv( s, b, l, 0 )
60 #define BerWrite( s, b, l ) send( s->sb_sd, b, (int) l, 0 )
64 * NCSA Telnet TCP/IP stack (under DOS)
66 #define read( s, b, l ) nread( s, b, l )
67 #define BerWrite( s, b, l ) netwrite( s->sb_sd, b, l )
71 * Windows Socket API (under DOS/Windows 3.x)
73 #define read( s, b, l ) recv( s, b, l, 0 )
74 #define BerWrite( s, b, l ) send( s->sb_sd, b, l, 0 )
79 * 32-bit Windows Socket API (under Windows NT or Windows 95)
81 #define read( s, b, l ) recv( s, b, l, 0 )
82 #define BerWrite( s, b, l ) send( s->sb_sd, b, l, 0 )
86 * VMS -- each write must be 64K or smaller
88 #define MAX_WRITE 65535
89 #define BerWrite( sb, b, l ) write( sb->sb_sd, b, (l<MAX_WRITE)? l : MAX_WRITE)
92 * everything else (Unix/BSD 4.3 socket API)
94 #define BerWrite( sb, b, l ) write( sb->sb_sd, b, l )
96 #define udp_read( sb, b, l, al ) recvfrom(sb->sb_sd, (char *)b, l, 0, \
97 (struct sockaddr *)sb->sb_fromaddr, \
98 (al = sizeof(struct sockaddr), &al))
99 #define udp_write( sb, b, l ) sendto(sb->sb_sd, (char *)(b), l, 0, \
100 (struct sockaddr *)sb->sb_useaddr, sizeof(struct sockaddr))
106 #define udp_read( sb, b, l, al ) CLDAP NOT SUPPORTED
107 #define udp_write( sb, b, l ) CLDAP NOT SUPPORTED
108 #endif /* udp_read */
110 #define EXBUFSIZ 1024
113 ber_filbuf( Sockbuf *sb, long len )
116 #ifdef LDAP_CONNECTIONLESS
118 #endif /* LDAP_CONNECTIONLESS */
120 if ( sb->sb_ber.ber_buf == NULL ) {
121 if ( (sb->sb_ber.ber_buf = (char *) malloc( READBUFSIZ )) ==
124 sb->sb_ber.ber_ptr = sb->sb_ber.ber_buf;
125 sb->sb_ber.ber_end = sb->sb_ber.ber_buf;
128 if ( sb->sb_naddr > 0 ) {
129 #ifdef LDAP_CONNECTIONLESS
130 rc = udp_read(sb, sb->sb_ber.ber_buf, READBUFSIZ, addrlen );
132 if ( sb->sb_debug ) {
133 lber_log_printf( LDAP_DEBUG_ANY, sb->sb_debug,
134 "ber_filbuf udp_read %d bytes\n",
137 lber_log_bprint( LDAP_DEBUG_PACKETS, sb->sb_debug,
138 sb->sb_ber.ber_buf, rc );
140 #else /* LDAP_CONNECTIONLESS */
142 #endif /* LDAP_CONNECTIONLESS */
144 rc = read( sb->sb_sd, sb->sb_ber.ber_buf,
145 ((sb->sb_options & LBER_NO_READ_AHEAD) && (len < READBUFSIZ)) ?
150 sb->sb_ber.ber_ptr = sb->sb_ber.ber_buf + 1;
151 sb->sb_ber.ber_end = sb->sb_ber.ber_buf + rc;
152 return( (unsigned char)*sb->sb_ber.ber_buf );
160 BerRead( Sockbuf *sb, char *buf, long len )
166 if ( (c = bergetc( sb, len )) < 0 ) {
181 ber_read( BerElement *ber, char *buf, unsigned long len )
183 unsigned long actuallen, nleft;
185 nleft = ber->ber_end - ber->ber_ptr;
186 actuallen = nleft < len ? nleft : len;
188 SAFEMEMCPY( buf, ber->ber_ptr, (size_t)actuallen );
190 ber->ber_ptr += actuallen;
192 return( (long)actuallen );
196 ber_write( BerElement *ber, char *buf, unsigned long len, int nosos )
198 if ( nosos || ber->ber_sos == NULL ) {
199 if ( ber->ber_ptr + len > ber->ber_end ) {
200 if ( ber_realloc( ber, len ) != 0 )
203 SAFEMEMCPY( ber->ber_ptr, buf, (size_t)len );
207 if ( ber->ber_sos->sos_ptr + len > ber->ber_end ) {
208 if ( ber_realloc( ber, len ) != 0 )
211 SAFEMEMCPY( ber->ber_sos->sos_ptr, buf, (size_t)len );
212 ber->ber_sos->sos_ptr += len;
213 ber->ber_sos->sos_clen += len;
219 ber_realloc( BerElement *ber, unsigned long len )
221 unsigned long need, have, total;
226 have = (ber->ber_end - ber->ber_buf) / EXBUFSIZ;
227 need = (len < EXBUFSIZ ? 1 : (len + (EXBUFSIZ - 1)) / EXBUFSIZ);
228 total = have * EXBUFSIZ + need * EXBUFSIZ;
230 oldbuf = ber->ber_buf;
232 if ( ber->ber_buf == NULL ) {
233 if ( (ber->ber_buf = (char *) malloc( (size_t)total )) == NULL )
235 } else if ( (ber->ber_buf = (char *) realloc( ber->ber_buf,
236 (size_t)total )) == NULL )
239 ber->ber_end = ber->ber_buf + total;
242 * If the stinking thing was moved, we need to go through and
243 * reset all the sos and ber pointers. Offsets would've been
244 * a better idea... oh well.
247 if ( ber->ber_buf != oldbuf ) {
248 ber->ber_ptr = ber->ber_buf + (ber->ber_ptr - oldbuf);
250 for ( s = ber->ber_sos; s != NULLSEQORSET; s = s->sos_next ) {
251 off = s->sos_first - oldbuf;
252 s->sos_first = ber->ber_buf + off;
254 off = s->sos_ptr - oldbuf;
255 s->sos_ptr = ber->ber_buf + off;
263 ber_free( BerElement *ber, int freebuf )
265 if ( freebuf && ber->ber_buf != NULL )
266 free( ber->ber_buf );
268 free( (char *) ber );
272 ber_flush( Sockbuf *sb, BerElement *ber, int freeit )
274 long nwritten, towrite, rc;
276 if ( ber->ber_rwptr == NULL ) {
277 ber->ber_rwptr = ber->ber_buf;
279 towrite = ber->ber_ptr - ber->ber_rwptr;
281 if ( sb->sb_debug ) {
282 lber_log_printf( LDAP_DEBUG_ANY, sb->sb_debug,
283 "ber_flush: %ld bytes to sd %ld%s\n", towrite,
284 (long) sb->sb_sd, ber->ber_rwptr != ber->ber_buf ? " (re-flush)"
286 lber_log_bprint( LDAP_DEBUG_PACKETS, sb->sb_debug,
287 ber->ber_rwptr, towrite );
290 #if !defined(MACOS) && !defined(DOS)
291 if ( sb->sb_options & (LBER_TO_FILE | LBER_TO_FILE_ONLY) ) {
292 rc = write( sb->sb_fd, ber->ber_buf, towrite );
293 if ( sb->sb_options & LBER_TO_FILE_ONLY ) {
301 if (sb->sb_naddr > 0) {
302 #ifdef LDAP_CONNECTIONLESS
303 rc = udp_write( sb, ber->ber_buf + nwritten,
305 #else /* LDAP_CONNECTIONLESS */
307 #endif /* LDAP_CONNECTIONLESS */
311 /* fake error if write was not atomic */
319 if ( (rc = BerWrite( sb, ber->ber_rwptr,
320 (size_t) towrite )) <= 0 ) {
326 ber->ber_rwptr += rc;
327 } while ( towrite > 0 );
336 ber_alloc_t( int options )
340 if ( (ber = (BerElement *) calloc( 1, sizeof(BerElement) )) == NULLBER )
342 ber->ber_tag = LBER_DEFAULT;
343 ber->ber_options = options;
344 ber->ber_debug = lber_int_debug;
352 return( ber_alloc_t( 0 ) );
358 return( ber_alloc_t( LBER_USE_DER ) );
362 ber_dup( BerElement *ber )
366 if ( (new = ber_alloc()) == NULLBER )
375 /* OLD U-Mich ber_init() */
377 ber_init_w_nullc( BerElement *ber, int options )
379 (void) memset( (char *)ber, '\0', sizeof( BerElement ));
380 ber->ber_tag = LBER_DEFAULT;
381 ber->ber_options = (char) options;
384 /* New C-API ber_init() */
385 /* This function constructs a BerElement containing a copy
386 ** of the data in the bv argument.
389 ber_init( struct berval *bv )
397 ber = ber_alloc_t( 0 );
399 if( ber == NULLBER ) {
400 /* allocation failed */
405 if ( ( (unsigned int) ber_write ( ber, bv->bv_val, bv->bv_len, 0 )) != bv->bv_len ) {
406 /* write failed, so free and return NULL */
411 ber_reset( ber, 1 ); /* reset the pointer to the start of the buffer */
416 /* New C-API ber_flatten routine */
417 /* This routine allocates a struct berval whose contents are a BER
418 ** encoding taken from the ber argument. The bvPtr pointer pointers to
419 ** the returned berval.
423 struct berval **bvPtr)
431 if ( (bv = malloc( sizeof(struct berval))) == NULL ) {
436 /* ber is null, create an empty berval */
441 /* copy the berval */
442 ptrdiff_t len = ber->ber_ptr - ber->ber_buf;
444 if ( (bv->bv_val = (char *) malloc( len + 1 )) == NULL ) {
449 SAFEMEMCPY( bv->bv_val, ber->ber_buf, (size_t)len );
450 bv->bv_val[len] = '\0';
459 ber_reset( BerElement *ber, int was_writing )
462 ber->ber_end = ber->ber_ptr;
463 ber->ber_ptr = ber->ber_buf;
465 ber->ber_ptr = ber->ber_end;
468 ber->ber_rwptr = NULL;
471 /* return the tag - LBER_DEFAULT returned means trouble */
473 get_tag( Sockbuf *sb )
480 if ( BerRead( sb, (char *) &xbyte, 1 ) != 1 )
481 return( LBER_DEFAULT );
483 if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
484 return( (unsigned long) xbyte );
486 tagp = (char *) &tag;
488 for ( i = 1; i < sizeof(long); i++ ) {
489 if ( BerRead( sb, (char *) &xbyte, 1 ) != 1 )
490 return( LBER_DEFAULT );
494 if ( ! (xbyte & LBER_MORE_TAG_MASK) )
499 if ( i == sizeof(long) )
500 return( LBER_DEFAULT );
502 /* want leading, not trailing 0's */
503 return( tag >> (sizeof(long) - i - 1) );
507 ber_get_next( Sockbuf *sb, unsigned long *len, BerElement *ber )
509 unsigned long tag = 0, netlen, toread;
515 if ( ber->ber_debug ) {
516 lber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
521 * Any ber element looks like this: tag length contents.
522 * Assuming everything's ok, we return the tag byte (we
523 * can assume a single byte), return the length in len,
524 * and the rest of the undecoded element in buf.
527 * 1) small tags (less than 128)
528 * 2) definite lengths
529 * 3) primitive encodings used whenever possible
533 * first time through - malloc the buffer, set up ptrs, and
534 * read the tag and the length and as much of the rest as we can
537 if ( ber->ber_rwptr == NULL ) {
539 * First, we read the tag.
542 if ( (tag = get_tag( sb )) == LBER_DEFAULT ) {
543 return( LBER_DEFAULT );
548 * Next, read the length. The first byte contains the length
549 * of the length. If bit 8 is set, the length is the long
550 * form, otherwise it's the short form. We don't allow a
551 * length that's greater than what we can hold in an unsigned
556 if ( BerRead( sb, (char *) &lc, 1 ) != 1 ) {
557 return( LBER_DEFAULT );
560 noctets = (lc & 0x7f);
561 if ( noctets > sizeof(unsigned long) )
562 return( LBER_DEFAULT );
563 diff = sizeof(unsigned long) - noctets;
564 if ( BerRead( sb, (char *) &netlen + diff, noctets ) !=
566 return( LBER_DEFAULT );
568 *len = AC_NTOHL( netlen );
575 * Finally, malloc a buffer for the contents and read it in.
576 * It's this buffer that's passed to all the other ber decoding
580 #if defined( DOS ) && !defined( _WIN32 )
581 if ( *len > 65535 ) { /* DOS can't allocate > 64K */
582 return( LBER_DEFAULT );
584 #endif /* DOS && !_WIN32 */
586 if ( ( sb->sb_options & LBER_MAX_INCOMING_SIZE ) &&
587 *len > (unsigned long) sb->sb_max_incoming ) {
588 return( LBER_DEFAULT );
591 if ( (ber->ber_buf = (char *) malloc( (size_t)*len )) == NULL ) {
592 return( LBER_DEFAULT );
594 ber->ber_ptr = ber->ber_buf;
595 ber->ber_end = ber->ber_buf + *len;
596 ber->ber_rwptr = ber->ber_buf;
599 toread = (unsigned long)ber->ber_end - (unsigned long)ber->ber_rwptr;
601 if ( (rc = BerRead( sb, ber->ber_rwptr, (long)toread )) <= 0 ) {
602 return( LBER_DEFAULT );
606 ber->ber_rwptr += rc;
607 } while ( toread > 0 );
609 if ( ber->ber_debug ) {
610 lber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
611 "ber_get_next: tag 0x%lx len %ld contents:\n",
614 lber_log_dump( LDAP_DEBUG_BER, ber->ber_debug, ber, 1 );
618 ber->ber_rwptr = NULL;
619 return( ber->ber_tag );
622 Sockbuf *lber_sockbuf_alloc( void )
624 Sockbuf *sb = calloc(1, sizeof(Sockbuf));
625 sb->sb_debug = lber_int_debug;
629 Sockbuf *lber_sockbuf_alloc_fd( int fd )
631 Sockbuf *sb = lber_sockbuf_alloc();
637 void lber_sockbuf_free( Sockbuf *sb )
639 if(sb == NULL) return;
644 int lber_sockbuf_get_option( Sockbuf *sb, int opt, void *outvalue )
646 return LBER_OPT_ERROR;
649 int lber_sockbuf_set_option( Sockbuf *sb, int opt, void *invalue )
651 return LBER_OPT_ERROR;