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 if ( (c = lber_pvt_sb_read( sb, buf, len )) <= 0 ) {
69 ber_read( BerElement *ber, char *buf, unsigned long len )
71 unsigned long actuallen, nleft;
73 nleft = ber->ber_end - ber->ber_ptr;
74 actuallen = nleft < len ? nleft : len;
76 SAFEMEMCPY( buf, ber->ber_ptr, (size_t)actuallen );
78 ber->ber_ptr += actuallen;
80 return( (long)actuallen );
84 ber_write( BerElement *ber, char *buf, unsigned long len, int nosos )
86 if ( nosos || ber->ber_sos == NULL ) {
87 if ( ber->ber_ptr + len > ber->ber_end ) {
88 if ( ber_realloc( ber, len ) != 0 )
91 SAFEMEMCPY( ber->ber_ptr, buf, (size_t)len );
95 if ( ber->ber_sos->sos_ptr + len > ber->ber_end ) {
96 if ( ber_realloc( ber, len ) != 0 )
99 SAFEMEMCPY( ber->ber_sos->sos_ptr, buf, (size_t)len );
100 ber->ber_sos->sos_ptr += len;
101 ber->ber_sos->sos_clen += len;
107 ber_realloc( BerElement *ber, unsigned long len )
109 unsigned long need, have, total;
114 have = (ber->ber_end - ber->ber_buf) / EXBUFSIZ;
115 need = (len < EXBUFSIZ ? 1 : (len + (EXBUFSIZ - 1)) / EXBUFSIZ);
116 total = have * EXBUFSIZ + need * EXBUFSIZ;
118 oldbuf = ber->ber_buf;
120 if ( ber->ber_buf == NULL ) {
121 if ( (ber->ber_buf = (char *) malloc( (size_t)total )) == NULL )
123 } else if ( (ber->ber_buf = (char *) realloc( ber->ber_buf,
124 (size_t)total )) == NULL )
127 ber->ber_end = ber->ber_buf + total;
130 * If the stinking thing was moved, we need to go through and
131 * reset all the sos and ber pointers. Offsets would've been
132 * a better idea... oh well.
135 if ( ber->ber_buf != oldbuf ) {
136 ber->ber_ptr = ber->ber_buf + (ber->ber_ptr - oldbuf);
138 for ( s = ber->ber_sos; s != NULLSEQORSET; s = s->sos_next ) {
139 off = s->sos_first - oldbuf;
140 s->sos_first = ber->ber_buf + off;
142 off = s->sos_ptr - oldbuf;
143 s->sos_ptr = ber->ber_buf + off;
151 ber_free( BerElement *ber, int freebuf )
153 if ( freebuf && ber->ber_buf != NULL )
154 free( ber->ber_buf );
156 free( (char *) ber );
160 ber_flush( Sockbuf *sb, BerElement *ber, int freeit )
162 long nwritten, towrite, rc;
164 if ( ber->ber_rwptr == NULL ) {
165 ber->ber_rwptr = ber->ber_buf;
167 towrite = ber->ber_ptr - ber->ber_rwptr;
169 if ( sb->sb_debug ) {
170 lber_log_printf( LDAP_DEBUG_ANY, sb->sb_debug,
171 "ber_flush: %ld bytes to sd %ld%s\n", towrite,
172 (long) sb->sb_sd, ber->ber_rwptr != ber->ber_buf ? " (re-flush)"
174 lber_log_bprint( LDAP_DEBUG_PACKETS, sb->sb_debug,
175 ber->ber_rwptr, towrite );
178 #if !defined(MACOS) && !defined(DOS)
179 if ( sb->sb_options & (LBER_TO_FILE | LBER_TO_FILE_ONLY) ) {
180 rc = write( sb->sb_fd, ber->ber_rwptr, towrite );
181 if ( sb->sb_options & LBER_TO_FILE_ONLY ) {
189 rc = lber_pvt_sb_write( sb, ber->ber_rwptr, towrite );
195 ber->ber_rwptr += rc;
196 } while ( towrite > 0 );
205 ber_alloc_t( int options )
209 if ( (ber = (BerElement *) calloc( 1, sizeof(BerElement) )) == NULLBER )
211 ber->ber_tag = LBER_DEFAULT;
212 ber->ber_options = options;
213 ber->ber_debug = lber_int_debug;
221 return( ber_alloc_t( 0 ) );
227 return( ber_alloc_t( LBER_USE_DER ) );
231 ber_dup( BerElement *ber )
235 if ( (new = ber_alloc()) == NULLBER )
244 /* OLD U-Mich ber_init() */
246 ber_init_w_nullc( BerElement *ber, int options )
248 (void) memset( (char *)ber, '\0', sizeof( BerElement ));
249 ber->ber_tag = LBER_DEFAULT;
250 ber->ber_options = (char) options;
253 /* New C-API ber_init() */
254 /* This function constructs a BerElement containing a copy
255 ** of the data in the bv argument.
258 ber_init( struct berval *bv )
266 ber = ber_alloc_t( 0 );
268 if( ber == NULLBER ) {
269 /* allocation failed */
274 if ( ( (unsigned int) ber_write ( ber, bv->bv_val, bv->bv_len, 0 )) != bv->bv_len ) {
275 /* write failed, so free and return NULL */
280 ber_reset( ber, 1 ); /* reset the pointer to the start of the buffer */
285 /* New C-API ber_flatten routine */
286 /* This routine allocates a struct berval whose contents are a BER
287 ** encoding taken from the ber argument. The bvPtr pointer pointers to
288 ** the returned berval.
292 struct berval **bvPtr)
300 if ( (bv = malloc( sizeof(struct berval))) == NULL ) {
305 /* ber is null, create an empty berval */
310 /* copy the berval */
311 ptrdiff_t len = ber->ber_ptr - ber->ber_buf;
313 if ( (bv->bv_val = (char *) malloc( len + 1 )) == NULL ) {
318 SAFEMEMCPY( bv->bv_val, ber->ber_buf, (size_t)len );
319 bv->bv_val[len] = '\0';
328 ber_reset( BerElement *ber, int was_writing )
331 ber->ber_end = ber->ber_ptr;
332 ber->ber_ptr = ber->ber_buf;
334 ber->ber_ptr = ber->ber_end;
337 ber->ber_rwptr = NULL;
341 /* return the tag - LBER_DEFAULT returned means trouble */
343 get_tag( Sockbuf *sb )
350 if ( lber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
351 return( LBER_DEFAULT );
353 if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
354 return( (unsigned long) xbyte );
356 tagp = (char *) &tag;
358 for ( i = 1; i < sizeof(long); i++ ) {
359 if ( lber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
360 return( LBER_DEFAULT );
364 if ( ! (xbyte & LBER_MORE_TAG_MASK) )
369 if ( i == sizeof(long) )
370 return( LBER_DEFAULT );
372 /* want leading, not trailing 0's */
373 return( tag >> (sizeof(long) - i - 1) );
378 * A rewrite of get_get_next that can safely be called multiple times
379 * for the same packet. It will simply continue were it stopped until
380 * a full packet is read.
384 ber_get_next( Sockbuf *sb, unsigned long *len, BerElement *ber )
386 if ( ber->ber_debug ) {
387 lber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
392 * Any ber element looks like this: tag length contents.
393 * Assuming everything's ok, we return the tag byte (we
394 * can assume a single byte), return the length in len,
395 * and the rest of the undecoded element in buf.
398 * 1) small tags (less than 128)
399 * 2) definite lengths
400 * 3) primitive encodings used whenever possible
403 if (ber->ber_rwptr == NULL) {
404 assert( ber->ber_buf == NULL );
405 ber->ber_rwptr = (char *) &ber->ber_tag;
409 #define PTR_IN_VAR( ptr, var )\
410 (((ptr)>=(char *) &(var)) && ((ptr)< (char *) &(var)+sizeof(var)))
412 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_tag)) {
413 if (ber->ber_rwptr == (char *) &ber->ber_tag) {
414 if (lber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
416 if ((ber->ber_rwptr[0] & LBER_BIG_TAG_MASK)
417 != LBER_BIG_TAG_MASK) {
418 ber->ber_tag = ber->ber_rwptr[0];
419 ber->ber_rwptr = (char *) &ber->ber_usertag;
425 /* reading the tag... */
426 if (lber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
428 if (! (ber->ber_rwptr[0] & LBER_MORE_TAG_MASK) ) {
429 ber->ber_tag>>=sizeof(ber->ber_tag) -
430 ((char *) &ber->ber_tag - ber->ber_rwptr);
431 ber->ber_rwptr = (char *) &ber->ber_usertag;
434 } while (PTR_IN_VAR(ber->ber_rwptr,ber->ber_tag));
435 errno = ERANGE; /* this is a serious error. */
439 if (ber->ber_rwptr==(char *) &ber->ber_usertag) {
441 if (lber_pvt_sb_read( sb, (char *) &c, 1)<=0)
445 if ( (len==0) || ( len>sizeof( ber->ber_len ) ) ) {
449 ber->ber_rwptr = (char *) &ber->ber_len +
450 sizeof(ber->ber_len) - len;
457 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_len)) {
460 to_go = (char *) &ber->ber_len + sizeof( ber->ber_len ) -
463 res = lber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
466 ber->ber_rwptr += res;
468 /* convert length. */
469 ber->ber_len = AC_NTOHL( ber->ber_len );
472 #if defined( EWOULDBLOCK )
474 #elif defined( EAGAIN )
481 /* now fill the buffer. */
482 if (ber->ber_buf==NULL) {
483 if (ber->ber_len > MAX_BERBUFSIZE) {
487 ber->ber_buf = (char *) malloc( ber->ber_len );
488 if (ber->ber_buf==NULL)
490 ber->ber_rwptr = ber->ber_buf;
491 ber->ber_ptr = ber->ber_buf;
492 ber->ber_end = ber->ber_buf + ber->ber_len;
494 if ((ber->ber_rwptr>=ber->ber_buf) && (ber->ber_rwptr<ber->ber_end)) {
498 to_go = ber->ber_end - ber->ber_rwptr;
501 res = lber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
507 #if defined( EWOULDBLOCK )
509 #elif defined( EAGAIN )
515 ber->ber_rwptr = NULL;
517 if ( ber->ber_debug ) {
518 lber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
519 "ber_get_next: tag 0x%lx len %ld contents:\n",
520 ber->ber_tag, ber->ber_len );
521 lber_log_dump( LDAP_DEBUG_BER, ber->ber_debug, ber, 1 );
523 return (ber->ber_tag);
525 assert( 0 ); /* ber structure is messed up ?*/
529 void ber_clear( BerElement *ber, int freebuf )
531 if ((freebuf) && (ber->ber_buf))
532 free( ber->ber_buf );
534 ber->ber_rwptr = NULL;
538 Sockbuf *lber_pvt_sb_alloc( void )
540 Sockbuf *sb = calloc(1, sizeof(Sockbuf));
541 lber_pvt_sb_init( sb );
545 Sockbuf *lber_pvt_sb_alloc_fd( int fd )
547 Sockbuf *sb = lber_pvt_sb_alloc();
548 lber_pvt_sb_set_desc( sb, fd );
549 lber_pvt_sb_set_io( sb, &lber_pvt_sb_io_tcp, NULL );
553 void lber_pvt_sb_free( Sockbuf *sb )
555 if(sb == NULL) return;
556 lber_pvt_sb_destroy( sb );
560 int lber_pvt_sb_get_option( Sockbuf *sb, int opt, void *outvalue )
562 return LBER_OPT_ERROR;
565 int lber_pvt_sb_set_option( Sockbuf *sb, int opt, void *invalue )
567 return LBER_OPT_ERROR;