mirror of
https://git.openldap.org/openldap/openldap.git
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400 lines
8.5 KiB
C
400 lines
8.5 KiB
C
/*
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* Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
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*/
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/*
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* util-int.c Various functions to replace missing threadsafe ones.
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* Without the real *_r funcs, things will work, but won't be
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* threadsafe.
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*
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* Written by Bart Hartgers.
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*
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* Copyright 1998, A. Hartgers, All rights reserved.
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* This software is not subject to any license of Eindhoven University of
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* Technology, since it was written in my spare time.
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*
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* Redistribution and use in source and binary forms are permitted only
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* as authorized by the OpenLDAP Public License. A copy of this
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* license is available at http://www.OpenLDAP.org/license.html or
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* in file LICENSE in the top-level directory of the distribution.
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*/
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#include "portable.h"
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#include <stdlib.h>
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#include <ac/errno.h>
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#include <ac/socket.h>
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#include <ac/string.h>
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#include <ac/time.h>
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#include "ldap-int.h"
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#if defined( LDAP_R_COMPILE )
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# include <ldap_pvt_thread.h>
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# if !defined( HAVE_REENTRANT_FUNCTIONS )
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# if !defined( HAVE_CTIME_R )
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# define LDAP_INT_CTIME_MUTEX 1
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# endif
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# if !defined( HAVE_GETHOSTBYNAME_R )
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# define LDAP_INT_GETHOSTBYNAME_MUTEX 1
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# endif
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# if !defined( HAVE_GETHOSTBYADDR_R )
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# define LDAP_INT_GETHOSTBYADDR_MUTEX 1
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# endif
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# endif /* defined( HAVE_REENTRANT_FUNCTIONS ) */
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#if defined( LDAP_INT_CTIME_MUTEX )
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static ldap_pvt_thread_mutex_t ldap_int_ctime_mutex;
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#endif
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#if defined( LDAP_INT_GETHOSTBYNAME_MUTEX )
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static ldap_pvt_thread_mutex_t ldap_int_gethostbyname_mutex;
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#endif
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#if defined( LDAP_INT_GETHOSTBYADDR_MUTEX )
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static ldap_pvt_thread_mutex_t ldap_int_gethostbyaddr_mutex;
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#endif
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#else /* LDAP_R_COMPILE */
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#undef HAVE_REENTRANT_FUNCTIONS
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#endif
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#if defined ( HAVE_STRSPN )
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#define int_strspn strspn
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#else
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static int int_strspn( const char *str, const char *delim )
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{
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int pos;
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const char *p=delim;
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for( pos=0; (*str) ; pos++,str++) {
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if (*str!=*p)
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for( p=delim; (*p) ; p++ ) {
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if (*str==*p)
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break;
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}
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if (*p=='\0')
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return pos;
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}
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return pos;
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}
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#endif
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#if defined( HAVE_STRPBRK )
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#define int_strpbrk strpbrk
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#else
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static char *int_strpbrk( const char *str, const char *accept )
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{
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const char *p;
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for( ; (*str) ; str++ ) {
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for( p=accept; (*p) ; p++) {
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if (*str==*p)
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return str;
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}
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}
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return NULL;
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}
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#endif
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char *ldap_pvt_strtok( char *str, const char *delim, char **pos )
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{
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#if defined( HAVE_STRTOK_R ) || defined( HAVE_REENTRANT_FUNCTIONS )
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return strtok_r(str, delim, pos);
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#else
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char *p;
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if (pos==NULL)
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return NULL;
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if (str==NULL) {
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if (*pos==NULL)
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return NULL;
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str=*pos;
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}
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/* skip any initial delimiters */
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str += int_strspn( str, delim );
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if (*str == '\0')
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return NULL;
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p = int_strpbrk( str, delim );
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if (p==NULL) {
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*pos = NULL;
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} else {
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*p ='\0';
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*pos = p+1;
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}
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return str;
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#endif
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}
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char *ldap_pvt_ctime( const time_t *tp, char *buf )
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{
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#if (defined( HAVE_CTIME_R ) || defined( HAVE_REENTRANT_FUNCTIONS)) \
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&& defined( CTIME_R_NARGS )
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# if (CTIME_R_NARGS > 3) || (CTIME_R_NARGS < 2)
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choke me! nargs should have 2 or 3
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# elif CTIME_R_NARGS > 2
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return ctime_r(tp,buf,26);
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# else
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return ctime_r(tp,buf);
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# endif
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#else
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# if defined( LDAP_INT_CTIME_MUTEX )
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ldap_pvt_thread_mutex_lock( &ldap_int_ctime_mutex );
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# endif
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memcpy( buf, ctime(tp), 26 );
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# if defined( LDAP_INT_CTIME_MUTEX )
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ldap_pvt_thread_mutex_unlock( &ldap_int_ctime_mutex );
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# endif
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return buf;
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#endif
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}
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#define BUFSTART 1024
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#define BUFMAX (32*1024)
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static char *safe_realloc( char **buf, int len );
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static int copy_hostent( struct hostent *res, char **buf, struct hostent * src );
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int ldap_pvt_gethostbyname_a(
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const char *name,
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struct hostent *resbuf,
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char **buf,
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struct hostent **result,
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int *herrno_ptr )
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{
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#if defined( HAVE_GETHOSTBYNAME_R ) || defined( HAVE_REENTRANT_FUNCTIONS )
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# define NEED_SAFE_REALLOC 1
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int r=-1;
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int buflen=BUFSTART;
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*buf = NULL;
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for(;buflen<BUFMAX;) {
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if (safe_realloc( buf, buflen )==NULL)
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return r;
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r = gethostbyname_r( name, resbuf, *buf,
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buflen, result, herrno_ptr );
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#ifdef NETDB_INTERNAL
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if ((r<0) &&
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(*herrno_ptr==NETDB_INTERNAL) &&
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(errno==ERANGE))
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{
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buflen*=2;
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continue;
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}
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#endif
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return r;
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}
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return -1;
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#elif defined( LDAP_INT_GETHOSTBYNAME_MUTEX )
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# define NEED_COPY_HOSTENT
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struct hostent *he;
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int retval;
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ldap_pvt_thread_mutex_lock( &ldap_int_gethostbyname_mutex );
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he = gethostbyname( name );
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if (he==NULL) {
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*herrno_ptr = h_errno;
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retval = -1;
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} else if (copy_hostent( resbuf, buf, he )<0) {
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*herrno_ptr = -1;
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retval = -1;
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} else {
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*result = resbuf;
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retval = 0;
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}
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ldap_pvt_thread_mutex_unlock( &ldap_int_gethostbyname_mutex );
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return retval;
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#else
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*result = gethostbyname( name );
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if (*result!=NULL) {
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return 0;
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}
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*herrno_ptr = h_errno;
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return -1;
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#endif
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}
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int ldap_pvt_gethostbyaddr_a(
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const char *addr,
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int len,
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int type,
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struct hostent *resbuf,
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char **buf,
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struct hostent **result,
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int *herrno_ptr )
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{
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#if defined( HAVE_GETHOSTBYADDR_R ) || defined( HAVE_REENTRANT_FUNCTIONS )
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# undef NEED_SAFE_REALLOC
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# define NEED_SAFE_REALLOC
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int r=-1;
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int buflen=BUFSTART;
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*buf = NULL;
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for(;buflen<BUFMAX;) {
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if (safe_realloc( buf, buflen )==NULL)
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return r;
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r = gethostbyaddr_r( addr, len, type,
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resbuf, *buf, buflen,
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result, herrno_ptr );
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#ifdef NETDB_INTERNAL
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if ((r<0) &&
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(*herrno_ptr==NETDB_INTERNAL) &&
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(errno==ERANGE))
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{
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buflen*=2;
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continue;
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}
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#endif
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return r;
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}
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return -1;
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#elif defined( LDAP_INT_GETHOSTBYADDR_MUTEX )
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# undef NEED_COPY_HOSTENT
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# define NEED_COPY_HOSTENT
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struct hostent *he;
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int retval;
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ldap_pvt_thread_mutex_lock( &ldap_int_gethostbyaddr_mutex );
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he = gethostbyaddr( addr, len, type );
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if (he==NULL) {
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*herrno_ptr = h_errno;
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retval = -1;
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} else if (copy_hostent( resbuf, buf, he )<0) {
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*herrno_ptr = -1;
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retval = -1;
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} else {
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*result = resbuf;
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retval = 0;
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}
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ldap_pvt_thread_mutex_unlock( &ldap_int_gethostbyaddr_mutex );
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return retval;
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#else /* gethostbyaddr() */
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*result = gethostbyaddr( addr, len, type );
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if (*result!=NULL) {
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return 0;
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}
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return -1;
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#endif
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}
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/*
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* ldap_pvt_init_utils() should be called before any other function.
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*/
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void ldap_pvt_init_utils( void )
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{
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static int done=0;
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if (done)
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return;
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done=1;
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#if defined( LDAP_INT_CTIME_MUTEX )
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ldap_pvt_thread_mutex_init( &ldap_int_ctime_mutex, NULL );
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#endif
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#if defined( LDAP_INT_GETHOSTBYNAME_MUTEX )
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ldap_pvt_thread_mutex_init( &ldap_int_gethostbyname_mutex, NULL );
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#endif
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#if defined( LDAP_INT_GETHOSTBYADDR_MUTEX )
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ldap_pvt_thread_mutex_init( &ldap_int_gethostbyaddr_mutex, NULL );
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#endif
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#if defined( LDAP_R_COMPILE )
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/* call other module init functions here... */
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#endif
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}
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#if defined( NEED_COPY_HOSTENT )
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# undef NEED_SAFE_REALLOC
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#define NEED_SAFE_REALLOC
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static char *cpy_aliases( char ***tgtio, char *buf, char **src )
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{
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int len;
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char **tgt=*tgtio;
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for( ; (*src) ; src++ ) {
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len = strlen( *src ) + 1;
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memcpy( buf, *src, len );
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*tgt++=buf;
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buf+=len;
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}
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*tgtio=tgt;
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return buf;
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}
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static char *cpy_addresses( char ***tgtio, char *buf, char **src, int len )
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{
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char **tgt=*tgtio;
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for( ; (*src) ; src++ ) {
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memcpy( buf, *src, len );
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*tgt++=buf;
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buf+=len;
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}
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*tgtio=tgt;
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return buf;
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}
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static int copy_hostent( struct hostent *res, char **buf, struct hostent * src )
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{
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char **p;
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char **tp;
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char *tbuf;
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int name_len;
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int n_alias;
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int total_alias_len;
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int n_addr;
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int total_addr_len;
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int total_len;
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/* calculate the size needed for the buffer */
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name_len = strlen( src->h_name ) + 1;
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for( n_alias=total_alias_len=0, p=src->h_aliases; (*p) ; p++ ) {
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total_alias_len += strlen( *p ) + 1;
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n_alias++;
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}
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for( n_addr=0, p=src->h_addr_list; (*p) ; p++ ) {
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n_addr++;
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}
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total_addr_len = n_addr * src->h_length;
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total_len = (n_alias + n_addr + 2) * sizeof( char * ) +
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total_addr_len + total_alias_len + name_len;
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if (safe_realloc( buf, total_len )) {
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tp = (char **) *buf;
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tbuf = *buf + (n_alias + n_addr + 2) * sizeof( char * );
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memcpy( res, src, sizeof( struct hostent ) );
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/* first the name... */
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memcpy( tbuf, src->h_name, name_len );
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res->h_name = tbuf; tbuf+=name_len;
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/* now the aliases */
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res->h_aliases = tp;
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tbuf = cpy_aliases( &tp, tbuf, src->h_aliases );
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*tp++=NULL;
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/* finally the addresses */
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res->h_addr_list = tp;
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tbuf = cpy_addresses( &tp, tbuf, src->h_addr_list, src->h_length );
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*tp++=NULL;
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return 0;
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}
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return -1;
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}
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#endif
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#if defined( NEED_SAFE_REALLOC )
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static char *safe_realloc( char **buf, int len )
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{
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char *tmpbuf;
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tmpbuf = realloc( *buf, len );
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if (tmpbuf) {
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*buf=tmpbuf;
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}
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return tmpbuf;
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}
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#endif
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