openldap/libraries/liblber/io.c

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/* io.c - ber general i/o routines */
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/*
* Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
*/
/* Portions
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* Copyright (c) 1990 Regents of the University of Michigan.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of Michigan at Ann Arbor. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/
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#include "portable.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <ac/ctype.h>
#include <ac/errno.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/unistd.h>
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#ifdef HAVE_IO_H
#include <io.h>
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#endif
#include "lber-int.h"
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static long BerRead LDAP_P(( Sockbuf *sb, char *buf, long len ));
static int ber_realloc LDAP_P(( BerElement *ber, unsigned long len ));
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#define EXBUFSIZ 1024
static long
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BerRead( Sockbuf *sb, char *buf, long len )
{
int c;
long nread = 0;
while ( len > 0 ) {
if ( (c = lber_pvt_sb_read( sb, buf, len )) <= 0 ) {
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if ( nread > 0 )
break;
return( c );
}
buf+= c;
nread+=c;
len-=c;
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}
return( nread );
}
long
ber_read( BerElement *ber, char *buf, unsigned long len )
{
unsigned long actuallen, nleft;
nleft = ber->ber_end - ber->ber_ptr;
actuallen = nleft < len ? nleft : len;
SAFEMEMCPY( buf, ber->ber_ptr, (size_t)actuallen );
ber->ber_ptr += actuallen;
return( (long)actuallen );
}
long
ber_write( BerElement *ber, char *buf, unsigned long len, int nosos )
{
if ( nosos || ber->ber_sos == NULL ) {
if ( ber->ber_ptr + len > ber->ber_end ) {
if ( ber_realloc( ber, len ) != 0 )
return( -1 );
}
SAFEMEMCPY( ber->ber_ptr, buf, (size_t)len );
ber->ber_ptr += len;
return( len );
} else {
if ( ber->ber_sos->sos_ptr + len > ber->ber_end ) {
if ( ber_realloc( ber, len ) != 0 )
return( -1 );
}
SAFEMEMCPY( ber->ber_sos->sos_ptr, buf, (size_t)len );
ber->ber_sos->sos_ptr += len;
ber->ber_sos->sos_clen += len;
return( len );
}
}
static int
ber_realloc( BerElement *ber, unsigned long len )
{
unsigned long need, have, total;
Seqorset *s;
long off;
char *oldbuf;
have = (ber->ber_end - ber->ber_buf) / EXBUFSIZ;
need = (len < EXBUFSIZ ? 1 : (len + (EXBUFSIZ - 1)) / EXBUFSIZ);
total = have * EXBUFSIZ + need * EXBUFSIZ;
oldbuf = ber->ber_buf;
if ( ber->ber_buf == NULL ) {
if ( (ber->ber_buf = (char *) malloc( (size_t)total )) == NULL )
return( -1 );
} else if ( (ber->ber_buf = (char *) realloc( ber->ber_buf,
(size_t)total )) == NULL )
return( -1 );
ber->ber_end = ber->ber_buf + total;
/*
* If the stinking thing was moved, we need to go through and
* reset all the sos and ber pointers. Offsets would've been
* a better idea... oh well.
*/
if ( ber->ber_buf != oldbuf ) {
ber->ber_ptr = ber->ber_buf + (ber->ber_ptr - oldbuf);
for ( s = ber->ber_sos; s != NULLSEQORSET; s = s->sos_next ) {
off = s->sos_first - oldbuf;
s->sos_first = ber->ber_buf + off;
off = s->sos_ptr - oldbuf;
s->sos_ptr = ber->ber_buf + off;
}
}
return( 0 );
}
void
ber_free( BerElement *ber, int freebuf )
{
if ( freebuf && ber->ber_buf != NULL )
free( ber->ber_buf );
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ber->ber_buf = NULL;
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free( (char *) ber );
}
int
ber_flush( Sockbuf *sb, BerElement *ber, int freeit )
{
long nwritten, towrite, rc;
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if ( ber->ber_rwptr == NULL ) {
ber->ber_rwptr = ber->ber_buf;
}
towrite = ber->ber_ptr - ber->ber_rwptr;
if ( sb->sb_debug ) {
lber_log_printf( LDAP_DEBUG_ANY, sb->sb_debug,
"ber_flush: %ld bytes to sd %ld%s\n", towrite,
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(long) sb->sb_sd, ber->ber_rwptr != ber->ber_buf ? " (re-flush)"
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: "" );
lber_log_bprint( LDAP_DEBUG_PACKETS, sb->sb_debug,
ber->ber_rwptr, towrite );
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}
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#if !defined(MACOS) && !defined(DOS)
if ( sb->sb_options & (LBER_TO_FILE | LBER_TO_FILE_ONLY) ) {
rc = write( sb->sb_fd, ber->ber_rwptr, towrite );
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if ( sb->sb_options & LBER_TO_FILE_ONLY ) {
return( (int)rc );
}
}
#endif
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nwritten = 0;
do {
rc = lber_pvt_sb_write( sb, ber->ber_rwptr, towrite );
if (rc<=0) {
return -1;
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}
towrite -= rc;
nwritten += rc;
ber->ber_rwptr += rc;
} while ( towrite > 0 );
if ( freeit )
ber_free( ber, 1 );
return( 0 );
}
BerElement *
ber_alloc_t( int options )
{
BerElement *ber;
if ( (ber = (BerElement *) calloc( 1, sizeof(BerElement) )) == NULLBER )
return( NULLBER );
ber->ber_tag = LBER_DEFAULT;
ber->ber_options = options;
ber->ber_debug = lber_int_debug;
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return( ber );
}
BerElement *
ber_alloc( void )
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{
return( ber_alloc_t( 0 ) );
}
BerElement *
der_alloc( void )
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{
return( ber_alloc_t( LBER_USE_DER ) );
}
BerElement *
ber_dup( BerElement *ber )
{
BerElement *new;
if ( (new = ber_alloc()) == NULLBER )
return( NULLBER );
*new = *ber;
return( new );
}
/* OLD U-Mich ber_init() */
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void
ber_init_w_nullc( BerElement *ber, int options )
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{
(void) memset( (char *)ber, '\0', sizeof( BerElement )); /* ### Bug: Expects pointers to have 00000 bit pattern */
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ber->ber_tag = LBER_DEFAULT;
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ber->ber_options = (char) options;
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}
/* New C-API ber_init() */
/* This function constructs a BerElement containing a copy
** of the data in the bv argument.
*/
BerElement *
ber_init( struct berval *bv )
{
BerElement *ber;
if ( bv == NULL ) {
return NULL;
}
ber = ber_alloc_t( 0 );
if( ber == NULLBER ) {
/* allocation failed */
return ( NULL );
}
/* copy the data */
if ( ( (unsigned int) ber_write ( ber, bv->bv_val, bv->bv_len, 0 )) != bv->bv_len ) {
/* write failed, so free and return NULL */
ber_free( ber, 1 );
return( NULL );
}
ber_reset( ber, 1 ); /* reset the pointer to the start of the buffer */
return ( ber );
}
/* New C-API ber_flatten routine */
/* This routine allocates a struct berval whose contents are a BER
** encoding taken from the ber argument. The bvPtr pointer pointers to
** the returned berval.
*/
int ber_flatten(
BerElement *ber,
struct berval **bvPtr)
{
struct berval *bv;
if(bvPtr == NULL) {
return( -1 );
}
if ( (bv = malloc( sizeof(struct berval))) == NULL ) {
return( -1 );
}
if ( ber == NULL ) {
/* ber is null, create an empty berval */
bv->bv_val = NULL;
bv->bv_len = 0;
} else {
/* copy the berval */
ptrdiff_t len = ber->ber_ptr - ber->ber_buf;
if ( (bv->bv_val = (char *) malloc( len + 1 )) == NULL ) {
ber_bvfree( bv );
return( -1 );
}
SAFEMEMCPY( bv->bv_val, ber->ber_buf, (size_t)len );
bv->bv_val[len] = '\0';
bv->bv_len = len;
}
*bvPtr = bv;
return( 0 );
}
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void
ber_reset( BerElement *ber, int was_writing )
{
if ( was_writing ) {
ber->ber_end = ber->ber_ptr;
ber->ber_ptr = ber->ber_buf;
} else {
ber->ber_ptr = ber->ber_end;
}
ber->ber_rwptr = NULL;
}
/* return the tag - LBER_DEFAULT returned means trouble */
static unsigned long
get_tag( Sockbuf *sb )
{
unsigned char xbyte;
unsigned long tag;
char *tagp;
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unsigned int i;
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if ( lber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
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return( LBER_DEFAULT );
if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
return( (unsigned long) xbyte );
tagp = (char *) &tag;
tagp[0] = xbyte;
for ( i = 1; i < sizeof(long); i++ ) {
if ( lber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
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return( LBER_DEFAULT );
tagp[i] = xbyte;
if ( ! (xbyte & LBER_MORE_TAG_MASK) )
break;
}
/* tag too big! */
if ( i == sizeof(long) )
return( LBER_DEFAULT );
/* want leading, not trailing 0's */
return( tag >> (sizeof(long) - i - 1) );
}
unsigned long
ber_get_next( Sockbuf *sb, unsigned long *len, BerElement *ber )
{
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unsigned long tag = 0, netlen, toread;
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unsigned char lc;
long rc;
long noctets;
unsigned int diff;
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if ( ber->ber_debug ) {
lber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
"ber_get_next\n" );
}
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/*
* Any ber element looks like this: tag length contents.
* Assuming everything's ok, we return the tag byte (we
* can assume a single byte), return the length in len,
* and the rest of the undecoded element in buf.
*
* Assumptions:
* 1) small tags (less than 128)
* 2) definite lengths
* 3) primitive encodings used whenever possible
*/
/*
* first time through - malloc the buffer, set up ptrs, and
* read the tag and the length and as much of the rest as we can
*/
if ( ber->ber_rwptr == NULL ) {
/*
* First, we read the tag.
*/
if ( (tag = get_tag( sb )) == LBER_DEFAULT ) {
return( LBER_DEFAULT );
}
ber->ber_tag = tag;
/*
* Next, read the length. The first byte contains the length
* of the length. If bit 8 is set, the length is the long
* form, otherwise it's the short form. We don't allow a
* length that's greater than what we can hold in an unsigned
* long.
*/
*len = netlen = 0;
if ( lber_pvt_sb_read( sb, (char *) &lc, 1 ) != 1 ) {
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return( LBER_DEFAULT );
}
if ( lc & 0x80 ) {
noctets = (lc & 0x7f);
if ( noctets > sizeof(unsigned long) )
return( LBER_DEFAULT );
diff = sizeof(unsigned long) - noctets;
if ( BerRead( sb, (char *) &netlen + diff, noctets ) !=
noctets ) {
return( LBER_DEFAULT );
}
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*len = AC_NTOHL( netlen );
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} else {
*len = lc;
}
ber->ber_len = *len;
/*
* Finally, malloc a buffer for the contents and read it in.
* It's this buffer that's passed to all the other ber decoding
* routines.
*/
#if defined( DOS ) && !defined( _WIN32 )
if ( *len > 65535 ) { /* DOS can't allocate > 64K */
return( LBER_DEFAULT );
}
#endif /* DOS && !_WIN32 */
#ifdef DEADWOOD
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if ( ( sb->sb_options & LBER_MAX_INCOMING_SIZE ) &&
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*len > (unsigned long) sb->sb_max_incoming ) {
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return( LBER_DEFAULT );
}
#endif
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if ( (ber->ber_buf = (char *) malloc( (size_t)*len )) == NULL ) {
return( LBER_DEFAULT );
}
ber->ber_ptr = ber->ber_buf;
ber->ber_end = ber->ber_buf + *len;
ber->ber_rwptr = ber->ber_buf;
}
toread = (unsigned long)ber->ber_end - (unsigned long)ber->ber_rwptr;
do {
if ( (rc = lber_pvt_sb_read( sb, ber->ber_rwptr, (long)toread )) <= 0 ) {
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return( LBER_DEFAULT );
}
toread -= rc;
ber->ber_rwptr += rc;
} while ( toread > 0 );
if ( ber->ber_debug ) {
lber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
"ber_get_next: tag 0x%lx len %ld contents:\n",
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tag, ber->ber_len );
lber_log_dump( LDAP_DEBUG_BER, ber->ber_debug, ber, 1 );
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}
*len = ber->ber_len;
ber->ber_rwptr = NULL;
return( ber->ber_tag );
}
Sockbuf *lber_pvt_sb_alloc( void )
{
Sockbuf *sb = calloc(1, sizeof(Sockbuf));
lber_pvt_sb_init( sb );
return sb;
}
Sockbuf *lber_pvt_sb_alloc_fd( int fd )
{
Sockbuf *sb = lber_pvt_sb_alloc();
lber_pvt_sb_set_desc( sb, fd );
lber_pvt_sb_set_io( sb, &lber_pvt_sb_io_tcp, NULL );
return sb;
}
void lber_pvt_sb_free( Sockbuf *sb )
{
if(sb == NULL) return;
lber_pvt_sb_destroy( sb );
free(sb);
}
int lber_pvt_sb_get_option( Sockbuf *sb, int opt, void *outvalue )
{
return LBER_OPT_ERROR;
}
int lber_pvt_sb_set_option( Sockbuf *sb, int opt, void *invalue )
{
return LBER_OPT_ERROR;
}