1 /* io.c - ber general i/o routines */
3 * Copyright (c) 1990 Regents of the University of Michigan.
6 * Redistribution and use in source and binary forms are permitted
7 * provided that this notice is preserved and that due credit is given
8 * to the University of Michigan at Ann Arbor. The name of the University
9 * may not be used to endorse or promote products derived from this
10 * software without specific prior written permission. This software
11 * is provided ``as is'' without express or implied warranty.
21 #include <ac/socket.h>
22 #include <ac/string.h>
23 #include <ac/unistd.h>
31 static int ber_realloc LDAP_P(( BerElement *ber, unsigned long len ));
32 static int ber_filbuf LDAP_P(( Sockbuf *sb, long len ));
33 static long BerRead LDAP_P(( Sockbuf *sb, char *buf, long len ));
35 static int BerWrite LDAP_P(( Sockbuf *sb, char *buf, long len ));
38 #define bergetc( sb, len ) ( sb->sb_ber.ber_end > sb->sb_ber.ber_ptr ? \
39 (unsigned char)*sb->sb_ber.ber_ptr++ : \
40 ber_filbuf( sb, len ))
44 * MacTCP/OpenTransport
46 #define read( s, b, l ) tcpread( s, 0, (unsigned char *)b, l, NULL )
47 #define MAX_WRITE 65535
48 #define BerWrite( sb, b, l ) tcpwrite( sb->sb_sd, (unsigned char *)(b), (l<MAX_WRITE)? l : MAX_WRITE )
55 #define read( s, b, l ) recv( s, b, l, 0 )
56 #define BerWrite( s, b, l ) send( s->sb_sd, b, (int) l, 0 )
60 * NCSA Telnet TCP/IP stack (under DOS)
62 #define read( s, b, l ) nread( s, b, l )
63 #define BerWrite( s, b, l ) netwrite( s->sb_sd, b, l )
67 * Windows Socket API (under DOS/Windows 3.x)
69 #define read( s, b, l ) recv( s, b, l, 0 )
70 #define BerWrite( s, b, l ) send( s->sb_sd, b, l, 0 )
75 * 32-bit Windows Socket API (under Windows NT or Windows 95)
77 #define read( s, b, l ) recv( s, b, l, 0 )
78 #define BerWrite( s, b, l ) send( s->sb_sd, b, l, 0 )
82 * VMS -- each write must be 64K or smaller
84 #define MAX_WRITE 65535
85 #define BerWrite( sb, b, l ) write( sb->sb_sd, b, (l<MAX_WRITE)? l : MAX_WRITE)
88 * everything else (Unix/BSD 4.3 socket API)
90 #define BerWrite( sb, b, l ) write( sb->sb_sd, b, l )
92 #define udp_read( sb, b, l, al ) recvfrom(sb->sb_sd, (char *)b, l, 0, \
93 (struct sockaddr *)sb->sb_fromaddr, \
94 (al = sizeof(struct sockaddr), &al))
95 #define udp_write( sb, b, l ) sendto(sb->sb_sd, (char *)(b), l, 0, \
96 (struct sockaddr *)sb->sb_useaddr, sizeof(struct sockaddr))
102 #define udp_read( sb, b, l, al ) CLDAP NOT SUPPORTED
103 #define udp_write( sb, b, l ) CLDAP NOT SUPPORTED
104 #endif /* udp_read */
106 #define EXBUFSIZ 1024
109 ber_filbuf( Sockbuf *sb, long len )
112 #ifdef LDAP_CONNECTIONLESS
114 #endif /* LDAP_CONNECTIONLESS */
116 if ( sb->sb_ber.ber_buf == NULL ) {
117 if ( (sb->sb_ber.ber_buf = (char *) malloc( READBUFSIZ )) ==
120 sb->sb_ber.ber_ptr = sb->sb_ber.ber_buf;
121 sb->sb_ber.ber_end = sb->sb_ber.ber_buf;
124 if ( sb->sb_naddr > 0 ) {
125 #ifdef LDAP_CONNECTIONLESS
126 rc = udp_read(sb, sb->sb_ber.ber_buf, READBUFSIZ, addrlen );
129 fprintf( stderr, "ber_filbuf udp_read %d bytes\n",
131 if ( lber_debug > 1 && rc > 0 )
132 lber_bprint( sb->sb_ber.ber_buf, rc );
134 #endif /* LDAP_DEBUG */
135 #else /* LDAP_CONNECTIONLESS */
137 #endif /* LDAP_CONNECTIONLESS */
139 rc = read( sb->sb_sd, sb->sb_ber.ber_buf,
140 ((sb->sb_options & LBER_NO_READ_AHEAD) &&
141 (len < READBUFSIZ)) ?
146 sb->sb_ber.ber_ptr = sb->sb_ber.ber_buf + 1;
147 sb->sb_ber.ber_end = sb->sb_ber.ber_buf + rc;
148 return( (unsigned char)*sb->sb_ber.ber_buf );
156 BerRead( Sockbuf *sb, char *buf, long len )
162 if ( (c = bergetc( sb, len )) < 0 ) {
177 ber_read( BerElement *ber, char *buf, unsigned long len )
179 unsigned long actuallen, nleft;
181 nleft = ber->ber_end - ber->ber_ptr;
182 actuallen = nleft < len ? nleft : len;
184 SAFEMEMCPY( buf, ber->ber_ptr, (size_t)actuallen );
186 ber->ber_ptr += actuallen;
188 return( (long)actuallen );
192 ber_write( BerElement *ber, char *buf, unsigned long len, int nosos )
194 if ( nosos || ber->ber_sos == NULL ) {
195 if ( ber->ber_ptr + len > ber->ber_end ) {
196 if ( ber_realloc( ber, len ) != 0 )
199 SAFEMEMCPY( ber->ber_ptr, buf, (size_t)len );
203 if ( ber->ber_sos->sos_ptr + len > ber->ber_end ) {
204 if ( ber_realloc( ber, len ) != 0 )
207 SAFEMEMCPY( ber->ber_sos->sos_ptr, buf, (size_t)len );
208 ber->ber_sos->sos_ptr += len;
209 ber->ber_sos->sos_clen += len;
215 ber_realloc( BerElement *ber, unsigned long len )
217 unsigned long need, have, total;
222 have = (ber->ber_end - ber->ber_buf) / EXBUFSIZ;
223 need = (len < EXBUFSIZ ? 1 : (len + (EXBUFSIZ - 1)) / EXBUFSIZ);
224 total = have * EXBUFSIZ + need * EXBUFSIZ;
226 oldbuf = ber->ber_buf;
228 if ( ber->ber_buf == NULL ) {
229 if ( (ber->ber_buf = (char *) malloc( (size_t)total )) == NULL )
231 } else if ( (ber->ber_buf = (char *) realloc( ber->ber_buf,
232 (size_t)total )) == NULL )
235 ber->ber_end = ber->ber_buf + total;
238 * If the stinking thing was moved, we need to go through and
239 * reset all the sos and ber pointers. Offsets would've been
240 * a better idea... oh well.
243 if ( ber->ber_buf != oldbuf ) {
244 ber->ber_ptr = ber->ber_buf + (ber->ber_ptr - oldbuf);
246 for ( s = ber->ber_sos; s != NULLSEQORSET; s = s->sos_next ) {
247 off = s->sos_first - oldbuf;
248 s->sos_first = ber->ber_buf + off;
250 off = s->sos_ptr - oldbuf;
251 s->sos_ptr = ber->ber_buf + off;
259 ber_free( BerElement *ber, int freebuf )
261 if ( freebuf && ber->ber_buf != NULL )
262 free( ber->ber_buf );
263 free( (char *) ber );
267 ber_flush( Sockbuf *sb, BerElement *ber, int freeit )
269 long nwritten, towrite, rc;
271 if ( ber->ber_rwptr == NULL ) {
272 ber->ber_rwptr = ber->ber_buf;
274 towrite = ber->ber_ptr - ber->ber_rwptr;
278 fprintf( stderr, "ber_flush: %ld bytes to sd %ld%s\n", towrite,
279 (long) sb->sb_sd, ber->ber_rwptr != ber->ber_buf ? " (re-flush)"
281 if ( lber_debug > 1 )
282 lber_bprint( ber->ber_rwptr, towrite );
285 #if !defined(MACOS) && !defined(DOS)
286 if ( sb->sb_options & (LBER_TO_FILE | LBER_TO_FILE_ONLY) ) {
287 rc = write( sb->sb_fd, ber->ber_buf, towrite );
288 if ( sb->sb_options & LBER_TO_FILE_ONLY ) {
296 if (sb->sb_naddr > 0) {
297 #ifdef LDAP_CONNECTIONLESS
298 rc = udp_write( sb, ber->ber_buf + nwritten,
300 #else /* LDAP_CONNECTIONLESS */
302 #endif /* LDAP_CONNECTIONLESS */
306 /* fake error if write was not atomic */
314 if ( (rc = BerWrite( sb, ber->ber_rwptr,
315 (size_t) towrite )) <= 0 ) {
321 ber->ber_rwptr += rc;
322 } while ( towrite > 0 );
331 ber_alloc_t( int options )
335 if ( (ber = (BerElement *) calloc( 1, sizeof(BerElement) )) == NULLBER )
337 ber->ber_tag = LBER_DEFAULT;
338 ber->ber_options = options;
346 return( ber_alloc_t( 0 ) );
352 return( ber_alloc_t( LBER_USE_DER ) );
356 ber_dup( BerElement *ber )
360 if ( (new = ber_alloc()) == NULLBER )
370 ber_init( BerElement *ber, int options )
372 (void) memset( (char *)ber, '\0', sizeof( BerElement ));
373 ber->ber_tag = LBER_DEFAULT;
374 ber->ber_options = options;
379 ber_reset( BerElement *ber, int was_writing )
382 ber->ber_end = ber->ber_ptr;
383 ber->ber_ptr = ber->ber_buf;
385 ber->ber_ptr = ber->ber_end;
388 ber->ber_rwptr = NULL;
395 ber_dump( BerElement *ber, int inout )
397 fprintf( stderr, "ber_dump: buf 0x%lx, ptr 0x%lx, end 0x%lx\n",
400 (long) ber->ber_end );
402 fprintf( stderr, " current len %ld, contents:\n",
403 (long) (ber->ber_end - ber->ber_ptr) );
404 lber_bprint( ber->ber_ptr, ber->ber_end - ber->ber_ptr );
406 fprintf( stderr, " current len %ld, contents:\n",
407 (long) (ber->ber_ptr - ber->ber_buf) );
408 lber_bprint( ber->ber_buf, ber->ber_ptr - ber->ber_buf );
413 ber_sos_dump( Seqorset *sos )
415 fprintf( stderr, "*** sos dump ***\n" );
416 while ( sos != NULLSEQORSET ) {
417 fprintf( stderr, "ber_sos_dump: clen %ld first 0x%lx ptr 0x%lx\n",
418 (long) sos->sos_clen, (long) sos->sos_first, (long) sos->sos_ptr );
419 fprintf( stderr, " current len %ld contents:\n",
420 (long) (sos->sos_ptr - sos->sos_first) );
421 lber_bprint( sos->sos_first, sos->sos_ptr - sos->sos_first );
425 fprintf( stderr, "*** end dump ***\n" );
430 /* return the tag - LBER_DEFAULT returned means trouble */
432 get_tag( Sockbuf *sb )
439 if ( BerRead( sb, (char *) &xbyte, 1 ) != 1 )
440 return( LBER_DEFAULT );
442 if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
443 return( (unsigned long) xbyte );
445 tagp = (char *) &tag;
447 for ( i = 1; i < sizeof(long); i++ ) {
448 if ( BerRead( sb, (char *) &xbyte, 1 ) != 1 )
449 return( LBER_DEFAULT );
453 if ( ! (xbyte & LBER_MORE_TAG_MASK) )
458 if ( i == sizeof(long) )
459 return( LBER_DEFAULT );
461 /* want leading, not trailing 0's */
462 return( tag >> (sizeof(long) - i - 1) );
466 ber_get_next( Sockbuf *sb, unsigned long *len, BerElement *ber )
468 unsigned long tag = 0, netlen, toread;
475 fprintf( stderr, "ber_get_next\n" );
479 * Any ber element looks like this: tag length contents.
480 * Assuming everything's ok, we return the tag byte (we
481 * can assume a single byte), return the length in len,
482 * and the rest of the undecoded element in buf.
485 * 1) small tags (less than 128)
486 * 2) definite lengths
487 * 3) primitive encodings used whenever possible
491 * first time through - malloc the buffer, set up ptrs, and
492 * read the tag and the length and as much of the rest as we can
495 if ( ber->ber_rwptr == NULL ) {
497 * First, we read the tag.
500 if ( (tag = get_tag( sb )) == LBER_DEFAULT ) {
501 return( LBER_DEFAULT );
506 * Next, read the length. The first byte contains the length
507 * of the length. If bit 8 is set, the length is the long
508 * form, otherwise it's the short form. We don't allow a
509 * length that's greater than what we can hold in an unsigned
514 if ( BerRead( sb, (char *) &lc, 1 ) != 1 ) {
515 return( LBER_DEFAULT );
518 noctets = (lc & 0x7f);
519 if ( noctets > sizeof(unsigned long) )
520 return( LBER_DEFAULT );
521 diff = sizeof(unsigned long) - noctets;
522 if ( BerRead( sb, (char *) &netlen + diff, noctets ) !=
524 return( LBER_DEFAULT );
526 *len = AC_NTOHL( netlen );
533 * Finally, malloc a buffer for the contents and read it in.
534 * It's this buffer that's passed to all the other ber decoding
538 #if defined( DOS ) && !defined( _WIN32 )
539 if ( *len > 65535 ) { /* DOS can't allocate > 64K */
540 return( LBER_DEFAULT );
542 #endif /* DOS && !_WIN32 */
544 if ( ( sb->sb_options & LBER_MAX_INCOMING_SIZE ) &&
545 *len > (unsigned long) sb->sb_max_incoming ) {
546 return( LBER_DEFAULT );
549 if ( (ber->ber_buf = (char *) malloc( (size_t)*len )) == NULL ) {
550 return( LBER_DEFAULT );
552 ber->ber_ptr = ber->ber_buf;
553 ber->ber_end = ber->ber_buf + *len;
554 ber->ber_rwptr = ber->ber_buf;
557 toread = (unsigned long)ber->ber_end - (unsigned long)ber->ber_rwptr;
559 if ( (rc = BerRead( sb, ber->ber_rwptr, (long)toread )) <= 0 ) {
560 return( LBER_DEFAULT );
564 ber->ber_rwptr += rc;
565 } while ( toread > 0 );
569 fprintf( stderr, "ber_get_next: tag 0x%lx len %ld contents:\n",
571 if ( lber_debug > 1 )
577 ber->ber_rwptr = NULL;
578 return( ber->ber_tag );