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openldap/libraries/libldap/cldap.c
Kurt Zeilenga a48b606a2f Initial LDAP_API_FEATURE_X_OPENLDAP commit: 
configure generates ldap_features.h based from ldap_features.h.in
  LDAP_REFERRALS -> LDAP_API_FEATURE_OPENLDAP_V2_REFERRALS
  LDAP_DNS -> LDAP_API_FEATURE_OPENLDAP_V2_DNS
1998-11-09 19:41:09 +00:00

520 lines
12 KiB
C
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/*
* Copyright (c) 1990, 1994 Regents of the University of Michigan.
* All rights reserved.
*
* cldap.c - synchronous, retrying interface to the cldap protocol
*/
#include "portable.h"
#ifdef LDAP_CONNECTIONLESS
#ifndef lint
static char copyright[] = "@(#) Copyright (c) 1990, 1994 Regents of the University of Michigan.\nAll rights reserved.\n";
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ac/errno.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/time.h>
#include "ldap-int.h"
#define DEF_CLDAP_TIMEOUT 3
#define DEF_CLDAP_TRIES 4
struct cldap_retinfo {
int cri_maxtries;
int cri_try;
int cri_useaddr;
long cri_timeout;
};
static int add_addr LDAP_P((
LDAP *ld, struct sockaddr *sap ));
static int cldap_result LDAP_P((
LDAP *ld, int msgid, LDAPMessage **res,
struct cldap_retinfo *crip, char *base ));
static int cldap_parsemsg LDAP_P((
LDAP *ld, int msgid, BerElement *ber,
LDAPMessage **res, char *base ));
/*
* cldap_open - initialize and connect to an ldap server. A magic cookie to
* be used for future communication is returned on success, NULL on failure.
*
* Example:
* LDAP *ld;
* ld = cldap_open( hostname, port );
*/
LDAP *
cldap_open( char *host, int port )
{
int s;
unsigned long address;
struct sockaddr_in sock;
struct hostent *hp;
LDAP *ld;
char *p;
int i;
Debug( LDAP_DEBUG_TRACE, "ldap_open\n", 0, 0, 0 );
if ( port == 0 ) {
port = LDAP_PORT;
}
if ( (s = socket( AF_INET, SOCK_DGRAM, 0 )) < 0 ) {
return( NULL );
}
sock.sin_addr.s_addr = 0;
sock.sin_family = AF_INET;
sock.sin_port = 0;
if ( bind(s, (struct sockaddr *) &sock, sizeof(sock)) < 0) {
close( s );
return( NULL );
}
if (( ld = ldap_init( host, port )) == NULL ) {
close( s );
return( NULL );
}
if ( (ld->ld_sb.sb_fromaddr = (void *) calloc( 1,
sizeof( struct sockaddr ))) == NULL ) {
free( ld );
close( s );
return( NULL );
}
ld->ld_sb.sb_sd = s;
ld->ld_sb.sb_naddr = 0;
ld->ld_version = LDAP_VERSION;
sock.sin_family = AF_INET;
sock.sin_port = htons( port );
/*
* 'host' may be a space-separated list.
*/
if ( host != NULL ) {
for ( ; host != NULL; host = p ) {
if (( p = strchr( host, ' ' )) != NULL ) {
for (*p++ = '\0'; *p == ' '; p++) {
;
}
}
if ( (address = inet_addr( host )) == (unsigned long) -1L ) {
if ( (hp = gethostbyname( host )) == NULL ) {
errno = EHOSTUNREACH;
continue;
}
for ( i = 0; hp->h_addr_list[ i ] != 0; ++i ) {
SAFEMEMCPY( (char *)&sock.sin_addr.s_addr,
(char *)hp->h_addr_list[ i ],
sizeof(sock.sin_addr.s_addr));
if ( add_addr( ld, (struct sockaddr *)&sock ) < 0 ) {
close( s );
free( ld );
return( NULL );
}
}
} else {
sock.sin_addr.s_addr = address;
if ( add_addr( ld, (struct sockaddr *)&sock ) < 0 ) {
close( s );
free( ld );
return( NULL );
}
}
if ( ld->ld_host == NULL ) {
ld->ld_host = strdup( host );
}
}
} else {
address = INADDR_LOOPBACK;
sock.sin_addr.s_addr = htonl( address );
if ( add_addr( ld, (struct sockaddr *)&sock ) < 0 ) {
close( s );
free( ld );
return( NULL );
}
}
if ( ld->ld_sb.sb_addrs == NULL
#ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS
|| ( ld->ld_defconn = ldap_new_connection( ld, NULL, 1,0,0 )) == NULL
#endif /* LDAP_API_FEATURE_X_OPENLDAP_V2_REFERRALS */
) {
free( ld );
return( NULL );
}
ld->ld_sb.sb_useaddr = ld->ld_sb.sb_addrs[ 0 ];
cldap_setretryinfo( ld, 0, 0 );
#ifdef LDAP_DEBUG
putchar( '\n' );
for ( i = 0; i < ld->ld_sb.sb_naddr; ++i ) {
Debug( LDAP_DEBUG_TRACE, "end of cldap_open address %d is %s\n",
i, inet_ntoa( ((struct sockaddr_in *)
ld->ld_sb.sb_addrs[ i ])->sin_addr ), 0 );
}
#endif
return( ld );
}
void
cldap_close( LDAP *ld )
{
ldap_ld_free( ld, 0 );
}
void
cldap_setretryinfo( LDAP *ld, int tries, int timeout )
{
ld->ld_cldaptries = ( tries <= 0 ) ? DEF_CLDAP_TRIES : tries;
ld->ld_cldaptimeout = ( timeout <= 0 ) ? DEF_CLDAP_TIMEOUT : timeout;
}
int
cldap_search_s( LDAP *ld, char *base, int scope, char *filter, char **attrs,
int attrsonly, LDAPMessage **res, char *logdn )
{
int ret, msgid;
struct cldap_retinfo cri;
*res = NULLMSG;
(void) memset( &cri, 0, sizeof( cri ));
if ( logdn != NULL ) {
ld->ld_cldapdn = logdn;
} else if ( ld->ld_cldapdn == NULL ) {
ld->ld_cldapdn = "";
}
do {
if ( cri.cri_try != 0 ) {
--ld->ld_msgid; /* use same id as before */
}
ld->ld_sb.sb_useaddr = ld->ld_sb.sb_addrs[ cri.cri_useaddr ];
Debug( LDAP_DEBUG_TRACE, "cldap_search_s try %d (to %s)\n",
cri.cri_try, inet_ntoa( ((struct sockaddr_in *)
ld->ld_sb.sb_useaddr)->sin_addr ), 0 );
if ( (msgid = ldap_search( ld, base, scope, filter, attrs,
attrsonly )) == -1 ) {
return( ld->ld_errno );
}
#ifndef LDAP_NOCACHE
if ( ld->ld_cache != NULL && ld->ld_responses != NULL ) {
Debug( LDAP_DEBUG_TRACE, "cldap_search_s res from cache\n",
0, 0, 0 );
*res = ld->ld_responses;
ld->ld_responses = ld->ld_responses->lm_next;
return( ldap_result2error( ld, *res, 0 ));
}
#endif /* LDAP_NOCACHE */
ret = cldap_result( ld, msgid, res, &cri, base );
} while (ret == -1);
return( ret );
}
static int
add_addr( LDAP *ld, struct sockaddr *sap )
{
struct sockaddr *newsap, **addrs;
if (( newsap = (struct sockaddr *)malloc( sizeof( struct sockaddr )))
== NULL ) {
ld->ld_errno = LDAP_NO_MEMORY;
return( -1 );
}
if ( ld->ld_sb.sb_naddr == 0 ) {
addrs = (struct sockaddr **)malloc( sizeof(struct sockaddr *));
} else {
addrs = (struct sockaddr **)realloc( ld->ld_sb.sb_addrs,
( ld->ld_sb.sb_naddr + 1 ) * sizeof(struct sockaddr *));
}
if ( addrs == NULL ) {
free( newsap );
ld->ld_errno = LDAP_NO_MEMORY;
return( -1 );
}
SAFEMEMCPY( (char *)newsap, (char *)sap, sizeof( struct sockaddr ));
addrs[ ld->ld_sb.sb_naddr++ ] = newsap;
ld->ld_sb.sb_addrs = (void **)addrs;
return( 0 );
}
static int
cldap_result( LDAP *ld, int msgid, LDAPMessage **res,
struct cldap_retinfo *crip, char *base )
{
Sockbuf *sb = &ld->ld_sb;
BerElement ber;
char *logdn;
int ret, id, fromaddr, i;
struct timeval tv;
fromaddr = -1;
if ( crip->cri_try == 0 ) {
crip->cri_maxtries = ld->ld_cldaptries * sb->sb_naddr;
crip->cri_timeout = ld->ld_cldaptimeout;
crip->cri_useaddr = 0;
Debug( LDAP_DEBUG_TRACE, "cldap_result tries %d timeout %d\n",
ld->ld_cldaptries, ld->ld_cldaptimeout, 0 );
}
if ((tv.tv_sec = crip->cri_timeout / sb->sb_naddr) < 1 ) {
tv.tv_sec = 1;
}
tv.tv_usec = 0;
Debug( LDAP_DEBUG_TRACE,
"cldap_result waiting up to %d seconds for a response\n",
tv.tv_sec, 0, 0 );
ber_init_w_nullc( &ber, 0 );
ldap_set_ber_options( ld, &ber );
if ( cldap_getmsg( ld, &tv, &ber ) == -1 ) {
ret = ld->ld_errno;
Debug( LDAP_DEBUG_TRACE, "cldap_getmsg returned -1 (%d)\n",
ret, 0, 0 );
} else if ( ld->ld_errno == LDAP_TIMEOUT ) {
Debug( LDAP_DEBUG_TRACE,
"cldap_result timed out\n", 0, 0, 0 );
/*
* It timed out; is it time to give up?
*/
if ( ++crip->cri_try >= crip->cri_maxtries ) {
ret = LDAP_TIMEOUT;
--crip->cri_try;
} else {
if ( ++crip->cri_useaddr >= sb->sb_naddr ) {
/*
* new round: reset address to first one and
* double the timeout
*/
crip->cri_useaddr = 0;
crip->cri_timeout <<= 1;
}
ret = -1;
}
} else {
/*
* Got a response. It should look like:
* { msgid, logdn, { searchresponse...}}
*/
logdn = NULL;
if ( ber_scanf( &ber, "ia", &id, &logdn ) == LBER_ERROR ) {
free( ber.ber_buf ); /* gack! */
ret = LDAP_DECODING_ERROR;
Debug( LDAP_DEBUG_TRACE,
"cldap_result: ber_scanf returned LBER_ERROR (%d)\n",
ret, 0, 0 );
} else if ( id != msgid ) {
free( ber.ber_buf ); /* gack! */
Debug( LDAP_DEBUG_TRACE,
"cldap_result: looking for msgid %d; got %d\n",
msgid, id, 0 );
ret = -1; /* ignore and keep looking */
} else {
/*
* got a result: determine which server it came from
* decode into ldap message chain
*/
for ( fromaddr = 0; fromaddr < sb->sb_naddr; ++fromaddr ) {
if ( memcmp( &((struct sockaddr_in *)
sb->sb_addrs[ fromaddr ])->sin_addr,
&((struct sockaddr_in *)sb->sb_fromaddr)->sin_addr,
sizeof( struct in_addr )) == 0 ) {
break;
}
}
ret = cldap_parsemsg( ld, msgid, &ber, res, base );
free( ber.ber_buf ); /* gack! */
Debug( LDAP_DEBUG_TRACE,
"cldap_result got result (%d)\n", ret, 0, 0 );
}
if ( logdn != NULL ) {
free( logdn );
}
}
/*
* If we are giving up (successfully or otherwise) then
* abandon any outstanding requests.
*/
if ( ret != -1 ) {
i = crip->cri_try;
if ( i >= sb->sb_naddr ) {
i = sb->sb_naddr - 1;
}
for ( ; i >= 0; --i ) {
if ( i == fromaddr ) {
continue;
}
sb->sb_useaddr = sb->sb_addrs[ i ];
Debug( LDAP_DEBUG_TRACE, "cldap_result abandoning id %d (to %s)\n",
msgid, inet_ntoa( ((struct sockaddr_in *)
sb->sb_useaddr)->sin_addr ), 0 );
(void) ldap_abandon( ld, msgid );
}
}
return( ld->ld_errno = ret );
}
static int
cldap_parsemsg( LDAP *ld, int msgid, BerElement *ber,
LDAPMessage **res, char *base )
{
unsigned long tag, len;
int baselen, slen, rc;
char *dn, *p, *cookie;
LDAPMessage *chain, *prev, *ldm;
struct berval *bv;
rc = LDAP_DECODING_ERROR; /* pessimistic */
ldm = chain = prev = NULLMSG;
baselen = ( base == NULL ) ? 0 : strlen( base );
bv = NULL;
for ( tag = ber_first_element( ber, &len, &cookie );
tag != LBER_DEFAULT && rc != LDAP_SUCCESS;
tag = ber_next_element( ber, &len, cookie )) {
if (( ldm = (LDAPMessage *)calloc( 1, sizeof(LDAPMessage)))
== NULL || ( ldm->lm_ber = ldap_alloc_ber_with_options( ld ))
== NULLBER ) {
rc = LDAP_NO_MEMORY;
break; /* return w/error*/
}
ldm->lm_msgid = msgid;
ldm->lm_msgtype = tag;
if ( tag == LDAP_RES_SEARCH_RESULT ) {
Debug( LDAP_DEBUG_TRACE, "cldap_parsemsg got search result\n",
0, 0, 0 );
if ( ber_get_stringal( ber, &bv ) == LBER_DEFAULT ) {
break; /* return w/error */
}
if ( ber_printf( ldm->lm_ber, "to", tag, bv->bv_val,
bv->bv_len ) == -1 ) {
break; /* return w/error */
}
ber_bvfree( bv );
bv = NULL;
rc = LDAP_SUCCESS;
} else if ( tag == LDAP_RES_SEARCH_ENTRY ) {
if ( ber_scanf( ber, "{aO", &dn, &bv ) == LBER_ERROR ) {
break; /* return w/error */
}
Debug( LDAP_DEBUG_TRACE, "cldap_parsemsg entry %s\n", dn, 0, 0 );
if ( dn != NULL && *(dn + ( slen = strlen(dn)) - 1) == '*' &&
baselen > 0 ) {
/*
* substitute original searchbase for trailing '*'
*/
if (( p = (char *)malloc( slen + baselen )) == NULL ) {
rc = LDAP_NO_MEMORY;
free( dn );
break; /* return w/error */
}
strcpy( p, dn );
strcpy( p + slen - 1, base );
free( dn );
dn = p;
}
if ( ber_printf( ldm->lm_ber, "t{so}", tag, dn, bv->bv_val,
bv->bv_len ) == -1 ) {
break; /* return w/error */
}
free( dn );
ber_bvfree( bv );
bv = NULL;
} else {
Debug( LDAP_DEBUG_TRACE, "cldap_parsemsg got unknown tag %d\n",
tag, 0, 0 );
rc = LDAP_PROTOCOL_ERROR;
break; /* return w/error */
}
/* Reset message ber so we can read from it later. Gack! */
ldm->lm_ber->ber_end = ldm->lm_ber->ber_ptr;
ldm->lm_ber->ber_ptr = ldm->lm_ber->ber_buf;
#ifdef LDAP_DEBUG
if ( ldap_debug & LDAP_DEBUG_PACKETS ) {
fprintf( stderr, "cldap_parsemsg add message id %d type %d:\n",
ldm->lm_msgid, ldm->lm_msgtype );
ber_dump( ldm->lm_ber, 1 );
}
#endif /* LDAP_DEBUG */
#ifndef LDAP_NOCACHE
if ( ld->ld_cache != NULL ) {
ldap_add_result_to_cache( ld, ldm );
}
#endif /* LDAP_NOCACHE */
if ( chain == NULL ) {
chain = ldm;
} else {
prev->lm_chain = ldm;
}
prev = ldm;
ldm = NULL;
}
/* dispose of any leftovers */
if ( ldm != NULL ) {
if ( ldm->lm_ber != NULLBER ) {
ber_free( ldm->lm_ber, 1 );
}
free( ldm );
}
if ( bv != NULL ) {
ber_bvfree( bv );
}
/* return chain, calling result2error if we got anything at all */
*res = chain;
return(( *res == NULLMSG ) ? rc : ldap_result2error( ld, *res, 0 ));
}
#endif /* LDAP_CONNECTIONLESS */
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