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- /* $OpenLDAP: pkg/ldap/libraries/libldap/util-int.c,v 1.17.8.7 2000/10/30 17:05:57 kurt Exp $ */
- /*
- * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
- * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
- */
- /*
- * util-int.c Various functions to replace missing threadsafe ones.
- * Without the real *_r funcs, things will
- * work, but might not be threadsafe.
- *
- * Written by Bart Hartgers.
- *
- * Copyright 1998, A. Hartgers, All rights reserved.
- * This software is not subject to any license of Eindhoven University of
- * Technology, since it was written in my spare time.
- *
- * Redistribution and use in source and binary forms are permitted only
- * as authorized by the OpenLDAP Public License. A copy of this
- * license is available at http://www.OpenLDAP.org/license.html or
- * in file LICENSE in the top-level directory of the distribution.
- */
-
-
- #include "portable.h"
-
- #include <ac/stdlib.h>
-
- #include <ac/errno.h>
- #include <ac/socket.h>
- #include <ac/string.h>
- #include <ac/time.h>
- #include <ac/unistd.h>
-
- #include "ldap-int.h"
-
- #if defined( LDAP_R_COMPILE )
- # include <ldap_pvt_thread.h>
- #else
- # undef HAVE_REENTRANT_FUNCTIONS
- #endif
-
- #if (defined( HAVE_CTIME_R ) || defined( HAVE_REENTRANT_FUNCTIONS)) \
- && defined( CTIME_R_NARGS )
- # define USE_CTIME_R
- #endif
-
- #if defined(HAVE_GETHOSTBYNAME_R) && \
- (GETHOSTBYNAME_R_NARGS > 6 || GETHOSTBYNAME_R_NARGS < 5)
- /* Don't know how to handle this version, pretend it's not there */
- # undef HAVE_GETHOSTBYNAME_R
- #endif
- #if defined(HAVE_GETHOSTBYADDR_R) && \
- (GETHOSTBYADDR_R_NARGS > 8 || GETHOSTBYADDR_R_NARGS < 7)
- /* Don't know how to handle this version, pretend it's not there */
- # undef HAVE_GETHOSTBYADDR_R
- #endif
-
- #ifdef LDAP_R_COMPILE
- # ifndef USE_CTIME_R
- static ldap_pvt_thread_mutex_t ldap_int_ctime_mutex;
- # endif
- # if !defined( HAVE_GETHOSTBYNAME_R ) || !defined( HAVE_GETHOSTBYADDR_R )
- static ldap_pvt_thread_mutex_t ldap_int_gethostby_mutex;
- # endif
- # ifdef HAVE_RES_QUERY
- ldap_pvt_thread_mutex_t ldap_int_resolv_mutex;
- # endif
- #endif /* LDAP_R_COMPILE */
-
- char *ldap_pvt_ctime( const time_t *tp, char *buf )
- {
- #ifdef USE_CTIME_R
- # if (CTIME_R_NARGS > 3) || (CTIME_R_NARGS < 2)
- # error "CTIME_R_NARGS should be 2 or 3"
- # elif CTIME_R_NARGS > 2 && defined(CTIME_R_RETURNS_INT)
- return( ctime_r(tp,buf,26) < 0 ? 0 : buf );
- # elif CTIME_R_NARGS > 2
- return ctime_r(tp,buf,26);
- # else
- return ctime_r(tp,buf);
- # endif
-
- #else
- # ifdef LDAP_R_COMPILE
- ldap_pvt_thread_mutex_lock( &ldap_int_ctime_mutex );
- # endif
- AC_MEMCPY( buf, ctime(tp), 26 );
- # ifdef LDAP_R_COMPILE
- ldap_pvt_thread_mutex_unlock( &ldap_int_ctime_mutex );
- # endif
- return buf;
- #endif
- }
-
- #define BUFSTART 1024
- #define BUFMAX (32*1024)
-
- static char *safe_realloc( char **buf, int len );
-
- #if !defined(HAVE_GETHOSTBYNAME_R) && defined(LDAP_R_COMPILE)
- static int copy_hostent( struct hostent *res, char **buf, struct hostent * src );
- #endif
-
- int ldap_pvt_gethostbyname_a(
- const char *name,
- struct hostent *resbuf,
- char **buf,
- struct hostent **result,
- int *herrno_ptr )
- {
- #if defined( HAVE_GETHOSTBYNAME_R )
-
- # define NEED_SAFE_REALLOC 1
- int r=-1;
- int buflen=BUFSTART;
- *buf = NULL;
- for(;buflen<BUFMAX;) {
- if (safe_realloc( buf, buflen )==NULL)
- return r;
-
- #if (GETHOSTBYNAME_R_NARGS < 6)
- r = ((*result=gethostbyname_r( name, resbuf, *buf,
- buflen, herrno_ptr ))== NULL) ?
- -1 : 0;
- #else
- r = gethostbyname_r( name, resbuf, *buf,
- buflen, result, herrno_ptr );
- #endif
-
- Debug( LDAP_DEBUG_TRACE, "ldap_pvt_gethostbyname_a: host=%s, r=%d\n",
- name, r, 0 );
-
- #ifdef NETDB_INTERNAL
- if ((r<0) &&
- (*herrno_ptr==NETDB_INTERNAL) &&
- (errno==ERANGE))
- {
- buflen*=2;
- continue;
- }
- #endif
- return r;
- }
- return -1;
- #elif defined( LDAP_R_COMPILE )
- # define NEED_COPY_HOSTENT
- struct hostent *he;
- int retval;
- *buf = NULL;
-
- ldap_pvt_thread_mutex_lock( &ldap_int_gethostby_mutex );
-
- he = gethostbyname( name );
-
- if (he==NULL) {
- *herrno_ptr = h_errno;
- retval = -1;
- } else if (copy_hostent( resbuf, buf, he )<0) {
- *herrno_ptr = -1;
- retval = -1;
- } else {
- *result = resbuf;
- retval = 0;
- }
-
- ldap_pvt_thread_mutex_unlock( &ldap_int_gethostby_mutex );
-
- return retval;
- #else
- *buf = NULL;
- #if defined(__OS2__) && defined(TCPV40HDRS)
- *result = gethostbyname( (unsigned char *)name );
- #else
- *result = gethostbyname( name );
- #endif
-
- if (*result!=NULL) {
- return 0;
- }
-
- *herrno_ptr = h_errno;
-
- return -1;
- #endif
- }
-
- int ldap_pvt_gethostbyaddr_a(
- const char *addr,
- int len,
- int type,
- struct hostent *resbuf,
- char **buf,
- struct hostent **result,
- int *herrno_ptr )
- {
- #if defined( HAVE_GETHOSTBYADDR_R )
-
- # undef NEED_SAFE_REALLOC
- # define NEED_SAFE_REALLOC
- int r=-1;
- int buflen=BUFSTART;
- *buf = NULL;
- for(;buflen<BUFMAX;) {
- if (safe_realloc( buf, buflen )==NULL)
- return r;
- #if (GETHOSTBYADDR_R_NARGS < 8)
- r = ((*result=gethostbyaddr_r( addr, len, type,
- resbuf, *buf, buflen,
- herrno_ptr )) == NULL) ?
- -1 : 0;
- #else
- r = gethostbyaddr_r( addr, len, type,
- resbuf, *buf, buflen,
- result, herrno_ptr );
- #endif
-
- #ifdef NETDB_INTERNAL
- if ((r<0) &&
- (*herrno_ptr==NETDB_INTERNAL) &&
- (errno==ERANGE))
- {
- buflen*=2;
- continue;
- }
- #endif
- return r;
- }
- return -1;
- #elif defined( LDAP_R_COMPILE )
- # undef NEED_COPY_HOSTENT
- # define NEED_COPY_HOSTENT
- struct hostent *he;
- int retval;
- *buf = NULL;
-
- ldap_pvt_thread_mutex_lock( &ldap_int_gethostby_mutex );
-
- he = gethostbyaddr( addr, len, type );
-
- if (he==NULL) {
- *herrno_ptr = h_errno;
- retval = -1;
- } else if (copy_hostent( resbuf, buf, he )<0) {
- *herrno_ptr = -1;
- retval = -1;
- } else {
- *result = resbuf;
- retval = 0;
- }
-
- ldap_pvt_thread_mutex_unlock( &ldap_int_gethostby_mutex );
-
- return retval;
- #else /* gethostbyaddr() */
- *buf = NULL;
- #if defined(__OS2__) && defined(TCPV40HDRS)
- *result = gethostbyaddr( (unsigned char *)addr, len, type );
- #else
- *result = gethostbyaddr( addr, len, type );
- #endif
-
- if (*result!=NULL) {
- return 0;
- }
- return -1;
- #endif
- }
- /*
- * ldap_int_utils_init() should be called before any other function.
- */
-
- void ldap_int_utils_init( void )
- {
- static int done=0;
- if (done)
- return;
- done=1;
-
- #ifdef LDAP_R_COMPILE
-
- #if !defined( USE_CTIME_R ) && !defined( HAVE_REENTRANT_FUNCTIONS )
- ldap_pvt_thread_mutex_init( &ldap_int_ctime_mutex );
- #endif
-
- #if !defined( HAVE_GETHOSTBYNAME_R ) || !defined( HAVE_GETHOSTBYADDR_R )
- ldap_pvt_thread_mutex_init( &ldap_int_gethostby_mutex );
- #endif
-
- #ifdef HAVE_RES_QUERY
- ldap_pvt_thread_mutex_init( &ldap_int_resolv_mutex );
- #endif
-
- /* call other module init functions here... */
- #endif
- }
-
- #if defined( NEED_COPY_HOSTENT )
- # undef NEED_SAFE_REALLOC
- #define NEED_SAFE_REALLOC
-
- static char *cpy_aliases( char ***tgtio, char *buf, char **src )
- {
- int len;
- char **tgt=*tgtio;
- for( ; (*src) ; src++ ) {
- len = strlen( *src ) + 1;
- AC_MEMCPY( buf, *src, len );
- *tgt++=buf;
- buf+=len;
- }
- *tgtio=tgt;
- return buf;
- }
-
- static char *cpy_addresses( char ***tgtio, char *buf, char **src, int len )
- {
- char **tgt=*tgtio;
- for( ; (*src) ; src++ ) {
- AC_MEMCPY( buf, *src, len );
- *tgt++=buf;
- buf+=len;
- }
- *tgtio=tgt;
- return buf;
- }
-
- static int copy_hostent( struct hostent *res, char **buf, struct hostent * src )
- {
- char **p;
- char **tp;
- char *tbuf;
- int name_len;
- int n_alias=0;
- int total_alias_len=0;
- int n_addr=0;
- int total_addr_len;
- int total_len;
-
- /* calculate the size needed for the buffer */
- name_len = strlen( src->h_name ) + 1;
-
- if( src->h_aliases != NULL ) {
- for( p = src->h_aliases; (*p) != NULL; p++ ) {
- total_alias_len += strlen( *p ) + 1;
- n_alias++;
- }
- }
-
- if( src->h_addr_list != NULL ) {
- for( p = src->h_addr_list; (*p) != NULL; p++ ) {
- n_addr++;
- }
- total_addr_len = n_addr * src->h_length;
- }
-
- total_len = (n_alias + n_addr + 2) * sizeof( char * ) +
- total_addr_len + total_alias_len + name_len;
-
- if (safe_realloc( buf, total_len )) {
- tp = (char **) *buf;
- tbuf = *buf + (n_alias + n_addr + 2) * sizeof( char * );
- AC_MEMCPY( res, src, sizeof( struct hostent ) );
- /* first the name... */
- AC_MEMCPY( tbuf, src->h_name, name_len );
- res->h_name = tbuf; tbuf+=name_len;
- /* now the aliases */
- res->h_aliases = tp;
- if ( src->h_aliases != NULL ) {
- tbuf = cpy_aliases( &tp, tbuf, src->h_aliases );
- }
- *tp++=NULL;
- /* finally the addresses */
- res->h_addr_list = tp;
- if ( src->h_addr_list != NULL ) {
- tbuf = cpy_addresses( &tp, tbuf, src->h_addr_list, src->h_length );
- }
- *tp++=NULL;
- return 0;
- }
- return -1;
- }
- #endif
-
- #if defined( NEED_SAFE_REALLOC )
- static char *safe_realloc( char **buf, int len )
- {
- char *tmpbuf;
- tmpbuf = LDAP_REALLOC( *buf, len );
- if (tmpbuf) {
- *buf=tmpbuf;
- }
- return tmpbuf;
- }
- #endif
-
- char * ldap_pvt_get_fqdn( char *name )
- {
- char *fqdn, *ha_buf;
- char hostbuf[MAXHOSTNAMELEN+1];
- struct hostent *hp, he_buf;
- int rc, local_h_errno;
-
- if( name == NULL ) {
- if( gethostname( hostbuf, MAXHOSTNAMELEN ) == 0 ) {
- hostbuf[MAXHOSTNAMELEN] = '\0';
- name = hostbuf;
- } else {
- name = "localhost";
- }
- }
-
- rc = ldap_pvt_gethostbyname_a( name,
- &he_buf, &ha_buf, &hp, &local_h_errno );
-
- if( rc < 0 || hp == NULL || hp->h_name == NULL ) {
- fqdn = LDAP_STRDUP( name );
- } else {
- fqdn = LDAP_STRDUP( hp->h_name );
- }
-
- LDAP_FREE( ha_buf );
- return fqdn;
- }
-
- #if defined( HAVE_GETADDRINFO ) && !defined( HAVE_GAI_STRERROR )
- char *ldap_pvt_gai_strerror (int code) {
- static struct {
- int code;
- const char *msg;
- } values[] = {
- #ifdef EAI_ADDRFAMILY
- { EAI_ADDRFAMILY, "Address family for hostname not supported" },
- #endif
- { EAI_AGAIN, "Temporary failure in name resolution" },
- { EAI_BADFLAGS, "Bad value for ai_flags" },
- { EAI_FAIL, "Non-recoverable failure in name resolution" },
- { EAI_FAMILY, "ai_family not supported" },
- { EAI_MEMORY, "Memory allocation failure" },
- #ifdef EAI_NODATA
- { EAI_NODATA, "No address associated with hostname" },
- #endif
- { EAI_NONAME, "Name or service not known" },
- { EAI_SERVICE, "Servname not supported for ai_socktype" },
- { EAI_SOCKTYPE, "ai_socktype not supported" },
- { EAI_SYSTEM, "System error" },
- { 0, NULL }
- };
-
- int i;
-
- for ( i = 0; values[i].msg != NULL; i++ ) {
- if ( values[i].code == code ) {
- return (char *) values[i].msg;
- }
- }
-
- return "Unknown error";
- }
- #endif
-