1 /* LIBLDAP url.c -- LDAP URL (RFC 2255) related routines */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
5 * Copyright 1998-2003 The OpenLDAP Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted only as authorized by the OpenLDAP
12 * A copy of this license is available in the file LICENSE in the
13 * top-level directory of the distribution or, alternatively, at
14 * <http://www.OpenLDAP.org/license.html>.
16 /* Portions Copyright (c) 1996 Regents of the University of Michigan.
17 * All rights reserved.
22 * LDAP URLs look like this:
23 * ldap[is]://host:port[/[dn[?[attributes][?[scope][?[filter][?exts]]]]]]
26 * attributes is a comma separated list
27 * scope is one of these three strings: base one sub (default=base)
28 * filter is an string-represented filter as in RFC 2254
30 * e.g., ldap://host:port/dc=com?o,cn?base?(o=openldap)?extension
32 * We also tolerate URLs that look like: <ldapurl> and <URL:ldapurl>
39 #include <ac/stdlib.h>
41 #include <ac/socket.h>
42 #include <ac/string.h>
48 static const char* skip_url_prefix LDAP_P((
51 const char **scheme ));
53 int ldap_pvt_url_scheme2proto( const char *scheme )
57 if( scheme == NULL ) {
61 if( strcmp("ldap", scheme) == 0 ) {
62 return LDAP_PROTO_TCP;
65 if( strcmp("ldapi", scheme) == 0 ) {
66 return LDAP_PROTO_IPC;
69 if( strcmp("ldaps", scheme) == 0 ) {
70 return LDAP_PROTO_TCP;
72 #ifdef LDAP_CONNECTIONLESS
73 if( strcmp("cldap", scheme) == 0 ) {
74 return LDAP_PROTO_UDP;
82 ldap_pvt_url_scheme2tls( const char *scheme )
86 if( scheme == NULL ) {
90 return strcmp("ldaps", scheme) == 0;
94 ldap_is_ldap_url( LDAP_CONST char *url )
103 if( skip_url_prefix( url, &enclosed, &scheme ) == NULL ) {
111 ldap_is_ldaps_url( LDAP_CONST char *url )
120 if( skip_url_prefix( url, &enclosed, &scheme ) == NULL ) {
124 return strcmp(scheme, "ldaps") == 0;
128 ldap_is_ldapi_url( LDAP_CONST char *url )
137 if( skip_url_prefix( url, &enclosed, &scheme ) == NULL ) {
141 return strcmp(scheme, "ldapi") == 0;
144 #ifdef LDAP_CONNECTIONLESS
146 ldap_is_ldapc_url( LDAP_CONST char *url )
155 if( skip_url_prefix( url, &enclosed, &scheme ) == NULL ) {
159 return strcmp(scheme, "cldap") == 0;
167 const char **scheme )
170 * return non-zero if this looks like a LDAP URL; zero if not
171 * if non-zero returned, *urlp will be moved past "ldap://" part of URL
181 /* skip leading '<' (if any) */
189 /* skip leading "URL:" (if any) */
190 if ( strncasecmp( p, LDAP_URL_URLCOLON, LDAP_URL_URLCOLON_LEN ) == 0 ) {
191 p += LDAP_URL_URLCOLON_LEN;
194 /* check for "ldap://" prefix */
195 if ( strncasecmp( p, LDAP_URL_PREFIX, LDAP_URL_PREFIX_LEN ) == 0 ) {
196 /* skip over "ldap://" prefix and return success */
197 p += LDAP_URL_PREFIX_LEN;
202 /* check for "ldaps://" prefix */
203 if ( strncasecmp( p, LDAPS_URL_PREFIX, LDAPS_URL_PREFIX_LEN ) == 0 ) {
204 /* skip over "ldaps://" prefix and return success */
205 p += LDAPS_URL_PREFIX_LEN;
210 /* check for "ldapi://" prefix */
211 if ( strncasecmp( p, LDAPI_URL_PREFIX, LDAPI_URL_PREFIX_LEN ) == 0 ) {
212 /* skip over "ldapi://" prefix and return success */
213 p += LDAPI_URL_PREFIX_LEN;
218 #ifdef LDAP_CONNECTIONLESS
219 /* check for "cldap://" prefix */
220 if ( strncasecmp( p, LDAPC_URL_PREFIX, LDAPC_URL_PREFIX_LEN ) == 0 ) {
221 /* skip over "cldap://" prefix and return success */
222 p += LDAPC_URL_PREFIX_LEN;
232 static int str2scope( const char *p )
234 if ( strcasecmp( p, "one" ) == 0 ) {
235 return LDAP_SCOPE_ONELEVEL;
237 } else if ( strcasecmp( p, "onelevel" ) == 0 ) {
238 return LDAP_SCOPE_ONELEVEL;
240 } else if ( strcasecmp( p, "base" ) == 0 ) {
241 return LDAP_SCOPE_BASE;
243 } else if ( strcasecmp( p, "sub" ) == 0 ) {
244 return LDAP_SCOPE_SUBTREE;
246 } else if ( strcasecmp( p, "subtree" ) == 0 ) {
247 return LDAP_SCOPE_SUBTREE;
249 } else if ( strcasecmp( p, "subordinate" ) == 0 ) {
250 return LDAP_SCOPE_SUBORDINATE;
252 } else if ( strcasecmp( p, "children" ) == 0 ) {
253 return LDAP_SCOPE_SUBORDINATE;
259 static int hex_escape( char *buf, const char *s, int list )
263 static const char hex[] = "0123456789ABCDEF";
265 if( s == NULL ) return 0;
267 for( pos=0,i=0; s[i]; i++ ) {
293 escape = s[i] < 0x20 || 0x1f >= s[i];
298 buf[pos++] = hex[ (s[i] >> 4) & 0x0f ];
299 buf[pos++] = hex[ s[i] & 0x0f ];
309 static int hex_escape_args( char *buf, char **s )
314 if( s == NULL ) return 0;
317 for( i=0; s[i] != NULL; i++ ) {
321 pos += hex_escape( &buf[pos], s[i], 1 );
327 char * ldap_url_desc2str( LDAPURLDesc *u )
334 if( u == NULL ) return NULL;
337 for( i=0; u->lud_exts[i]; i++ ) {
338 len += strlen( u->lud_exts[i] ) + 1;
343 if( u->lud_filter ) {
344 len += strlen( u->lud_filter );
347 if ( len ) len++; /* ? */
349 switch( u->lud_scope ) {
350 case LDAP_SCOPE_BASE:
351 case LDAP_SCOPE_ONELEVEL:
352 case LDAP_SCOPE_SUBTREE:
353 case LDAP_SCOPE_SUBORDINATE:
354 len += sizeof("subordinate");
359 if ( len ) len++; /* ? */
363 for( i=0; u->lud_attrs[i]; i++ ) {
364 len += strlen( u->lud_attrs[i] ) + 1;
367 } else if ( len ) len++; /* ? */
370 len += strlen( u->lud_dn ) + 1;
375 len += sizeof(":65535") - 1;
379 len+=strlen( u->lud_host );
382 len += strlen( u->lud_scheme ) + sizeof("://");
384 /* allocate enough to hex escape everything -- overkill */
385 s = LDAP_MALLOC( 3*len );
387 if( s == NULL ) return NULL;
390 sprintf( s, "%s://%s:%d%n", u->lud_scheme,
391 u->lud_host, u->lud_port, &sofar );
393 sprintf( s, "%s://%s%n", u->lud_scheme,
394 u->lud_host, &sofar );
397 if( sep < 1 ) goto done;
400 sofar += hex_escape( &s[sofar], u->lud_dn, 0 );
402 if( sep < 2 ) goto done;
405 sofar += hex_escape_args( &s[sofar], u->lud_attrs );
407 if( sep < 3 ) goto done;
410 switch( u->lud_scope ) {
411 case LDAP_SCOPE_BASE:
412 strcpy( &s[sofar], "base" );
413 sofar += sizeof("base") - 1;
415 case LDAP_SCOPE_ONELEVEL:
416 strcpy( &s[sofar], "one" );
417 sofar += sizeof("one") - 1;
419 case LDAP_SCOPE_SUBTREE:
420 strcpy( &s[sofar], "sub" );
421 sofar += sizeof("sub") - 1;
423 case LDAP_SCOPE_SUBORDINATE:
424 strcpy( &s[sofar], "children" );
425 sofar += sizeof("children") - 1;
429 if( sep < 4 ) goto done;
432 sofar += hex_escape( &s[sofar], u->lud_filter, 0 );
434 if( sep < 5 ) goto done;
437 sofar += hex_escape_args( &s[sofar], u->lud_exts );
445 ldap_url_parse_ext( LDAP_CONST char *url_in, LDAPURLDesc **ludpp )
448 * Pick apart the pieces of an LDAP URL.
454 const char *scheme = NULL;
458 if( url_in == NULL || ludpp == NULL ) {
459 return LDAP_URL_ERR_PARAM;
462 #ifndef LDAP_INT_IN_KERNEL
463 /* Global options may not be created yet
464 * We can't test if the global options are initialized
465 * because a call to LDAP_INT_GLOBAL_OPT() will try to allocate
466 * the options and cause infinite recursion
469 LDAP_LOG ( OPERATION, ENTRY, "ldap_url_parse_ext(%s)\n", url_in, 0, 0 );
471 Debug( LDAP_DEBUG_TRACE, "ldap_url_parse_ext(%s)\n", url_in, 0, 0 );
475 *ludpp = NULL; /* pessimistic */
477 url_tmp = skip_url_prefix( url_in, &enclosed, &scheme );
479 if ( url_tmp == NULL ) {
480 return LDAP_URL_ERR_BADSCHEME;
485 /* make working copy of the remainder of the URL */
486 url = LDAP_STRDUP( url_tmp );
488 return LDAP_URL_ERR_MEM;
492 p = &url[strlen(url)-1];
496 return LDAP_URL_ERR_BADENCLOSURE;
502 /* allocate return struct */
503 ludp = (LDAPURLDesc *)LDAP_CALLOC( 1, sizeof( LDAPURLDesc ));
505 if ( ludp == NULL ) {
507 return LDAP_URL_ERR_MEM;
510 ludp->lud_next = NULL;
511 ludp->lud_host = NULL;
514 ludp->lud_attrs = NULL;
515 ludp->lud_filter = NULL;
516 ludp->lud_scope = LDAP_SCOPE_DEFAULT;
517 ludp->lud_filter = NULL;
518 ludp->lud_exts = NULL;
520 ludp->lud_scheme = LDAP_STRDUP( scheme );
522 if ( ludp->lud_scheme == NULL ) {
524 ldap_free_urldesc( ludp );
525 return LDAP_URL_ERR_MEM;
528 /* scan forward for '/' that marks end of hostport and begin. of dn */
529 p = strchr( url, '/' );
532 /* terminate hostport; point to start of dn */
536 /* IPv6 syntax with [ip address]:port */
538 r = strchr( url, ']' );
541 ldap_free_urldesc( ludp );
542 return LDAP_URL_ERR_BADURL;
545 q = strchr( r, ':' );
547 q = strchr( url, ':' );
552 ldap_pvt_hex_unescape( q );
556 ldap_free_urldesc( ludp );
557 return LDAP_URL_ERR_BADURL;
560 ludp->lud_port = atoi( q );
563 ldap_pvt_hex_unescape( url );
565 /* If [ip address]:port syntax, url is [ip and we skip the [ */
566 ludp->lud_host = LDAP_STRDUP( url + ( *url == '[' ) );
568 if( ludp->lud_host == NULL ) {
570 ldap_free_urldesc( ludp );
571 return LDAP_URL_ERR_MEM;
575 * Kludge. ldap://111.222.333.444:389??cn=abc,o=company
577 * On early Novell releases, search references/referrals were returned
578 * in this format, i.e., the dn was kind of in the scope position,
579 * but the required slash is missing. The whole thing is illegal syntax,
580 * but we need to account for it. Fortunately it can't be confused with
583 if( (p == NULL) && (q != NULL) && ((q = strchr( q, '?')) != NULL)) {
585 /* ? immediately followed by question */
590 ldap_pvt_hex_unescape( q );
591 ludp->lud_dn = LDAP_STRDUP( q );
593 ludp->lud_dn = LDAP_STRDUP( "" );
596 if( ludp->lud_dn == NULL ) {
598 ldap_free_urldesc( ludp );
599 return LDAP_URL_ERR_MEM;
607 return LDAP_URL_SUCCESS;
610 /* scan forward for '?' that may marks end of dn */
611 q = strchr( p, '?' );
614 /* terminate dn part */
620 ldap_pvt_hex_unescape( p );
621 ludp->lud_dn = LDAP_STRDUP( p );
623 ludp->lud_dn = LDAP_STRDUP( "" );
626 if( ludp->lud_dn == NULL ) {
628 ldap_free_urldesc( ludp );
629 return LDAP_URL_ERR_MEM;
636 return LDAP_URL_SUCCESS;
639 /* scan forward for '?' that may marks end of attributes */
641 q = strchr( p, '?' );
644 /* terminate attributes part */
649 /* parse attributes */
650 ldap_pvt_hex_unescape( p );
651 ludp->lud_attrs = ldap_str2charray( p, "," );
653 if( ludp->lud_attrs == NULL ) {
655 ldap_free_urldesc( ludp );
656 return LDAP_URL_ERR_BADATTRS;
664 return LDAP_URL_SUCCESS;
667 /* scan forward for '?' that may marks end of scope */
669 q = strchr( p, '?' );
672 /* terminate the scope part */
677 /* parse the scope */
678 ldap_pvt_hex_unescape( p );
679 ludp->lud_scope = str2scope( p );
681 if( ludp->lud_scope == -1 ) {
683 ldap_free_urldesc( ludp );
684 return LDAP_URL_ERR_BADSCOPE;
692 return LDAP_URL_SUCCESS;
695 /* scan forward for '?' that may marks end of filter */
697 q = strchr( p, '?' );
700 /* terminate the filter part */
705 /* parse the filter */
706 ldap_pvt_hex_unescape( p );
711 ldap_free_urldesc( ludp );
712 return LDAP_URL_ERR_BADFILTER;
715 LDAP_FREE( ludp->lud_filter );
716 ludp->lud_filter = LDAP_STRDUP( p );
718 if( ludp->lud_filter == NULL ) {
720 ldap_free_urldesc( ludp );
721 return LDAP_URL_ERR_MEM;
729 return LDAP_URL_SUCCESS;
732 /* scan forward for '?' that may marks end of extensions */
734 q = strchr( p, '?' );
739 ldap_free_urldesc( ludp );
740 return LDAP_URL_ERR_BADURL;
743 /* parse the extensions */
744 ludp->lud_exts = ldap_str2charray( p, "," );
746 if( ludp->lud_exts == NULL ) {
748 ldap_free_urldesc( ludp );
749 return LDAP_URL_ERR_BADEXTS;
752 for( i=0; ludp->lud_exts[i] != NULL; i++ ) {
753 ldap_pvt_hex_unescape( ludp->lud_exts[i] );
755 if( *ludp->lud_exts[i] == '!' ) {
756 /* count the number of critical extensions */
757 ludp->lud_crit_exts++;
762 /* must have 1 or more */
764 ldap_free_urldesc( ludp );
765 return LDAP_URL_ERR_BADEXTS;
771 return LDAP_URL_SUCCESS;
775 ldap_url_parse( LDAP_CONST char *url_in, LDAPURLDesc **ludpp )
777 int rc = ldap_url_parse_ext( url_in, ludpp );
779 if( rc != LDAP_URL_SUCCESS ) {
783 if ((*ludpp)->lud_scope == LDAP_SCOPE_DEFAULT) {
784 (*ludpp)->lud_scope = LDAP_SCOPE_BASE;
787 if ((*ludpp)->lud_host != NULL && *(*ludpp)->lud_host == '\0') {
788 LDAP_FREE( (*ludpp)->lud_host );
789 (*ludpp)->lud_host = NULL;
792 if ((*ludpp)->lud_port == 0) {
793 if( strcmp((*ludpp)->lud_scheme, "ldap") == 0 ) {
794 (*ludpp)->lud_port = LDAP_PORT;
795 #ifdef LDAP_CONNECTIONLESS
796 } else if( strcmp((*ludpp)->lud_scheme, "cldap") == 0 ) {
797 (*ludpp)->lud_port = LDAP_PORT;
799 } else if( strcmp((*ludpp)->lud_scheme, "ldaps") == 0 ) {
800 (*ludpp)->lud_port = LDAPS_PORT;
808 ldap_url_dup ( LDAPURLDesc *ludp )
812 if ( ludp == NULL ) {
816 dest = LDAP_MALLOC( sizeof(LDAPURLDesc) );
821 dest->lud_scheme = NULL;
822 dest->lud_host = NULL;
824 dest->lud_filter = NULL;
825 dest->lud_attrs = NULL;
826 dest->lud_exts = NULL;
827 dest->lud_next = NULL;
829 if ( ludp->lud_scheme != NULL ) {
830 dest->lud_scheme = LDAP_STRDUP( ludp->lud_scheme );
831 if (dest->lud_scheme == NULL) {
832 ldap_free_urldesc(dest);
837 if ( ludp->lud_host != NULL ) {
838 dest->lud_host = LDAP_STRDUP( ludp->lud_host );
839 if (dest->lud_host == NULL) {
840 ldap_free_urldesc(dest);
845 if ( ludp->lud_dn != NULL ) {
846 dest->lud_dn = LDAP_STRDUP( ludp->lud_dn );
847 if (dest->lud_dn == NULL) {
848 ldap_free_urldesc(dest);
853 if ( ludp->lud_filter != NULL ) {
854 dest->lud_filter = LDAP_STRDUP( ludp->lud_filter );
855 if (dest->lud_filter == NULL) {
856 ldap_free_urldesc(dest);
861 if ( ludp->lud_attrs != NULL ) {
862 dest->lud_attrs = ldap_charray_dup( ludp->lud_attrs );
863 if (dest->lud_attrs == NULL) {
864 ldap_free_urldesc(dest);
869 if ( ludp->lud_exts != NULL ) {
870 dest->lud_exts = ldap_charray_dup( ludp->lud_exts );
871 if (dest->lud_exts == NULL) {
872 ldap_free_urldesc(dest);
881 ldap_url_duplist (LDAPURLDesc *ludlist)
883 LDAPURLDesc *dest, *tail, *ludp, *newludp;
887 for (ludp = ludlist; ludp != NULL; ludp = ludp->lud_next) {
888 newludp = ldap_url_dup(ludp);
889 if (newludp == NULL) {
890 ldap_free_urllist(dest);
896 tail->lud_next = newludp;
903 ldap_url_parselist (LDAPURLDesc **ludlist, const char *url )
905 return ldap_url_parselist_ext( ludlist, url, ", " );
909 ldap_url_parselist_ext (LDAPURLDesc **ludlist, const char *url, const char *sep )
915 assert( ludlist != NULL );
916 assert( url != NULL );
920 urls = ldap_str2charray(url, sep);
922 return LDAP_NO_MEMORY;
924 /* count the URLs... */
925 for (i = 0; urls[i] != NULL; i++) ;
926 /* ...and put them in the "stack" backward */
928 rc = ldap_url_parse( urls[i], &ludp );
930 ldap_charray_free(urls);
931 ldap_free_urllist(*ludlist);
935 ludp->lud_next = *ludlist;
938 ldap_charray_free(urls);
944 LDAPURLDesc **ludlist,
952 assert( ludlist != NULL );
953 assert( hosts != NULL );
957 specs = ldap_str2charray(hosts, ", ");
959 return LDAP_NO_MEMORY;
961 /* count the URLs... */
962 for (i = 0; specs[i] != NULL; i++) /* EMPTY */;
964 /* ...and put them in the "stack" backward */
966 ludp = LDAP_CALLOC( 1, sizeof(LDAPURLDesc) );
968 ldap_charray_free(specs);
969 ldap_free_urllist(*ludlist);
971 return LDAP_NO_MEMORY;
973 ludp->lud_port = port;
974 ludp->lud_host = specs[i];
976 p = strchr(ludp->lud_host, ':');
978 /* more than one :, IPv6 address */
979 if ( strchr(p+1, ':') != NULL ) {
980 /* allow [address] and [address]:port */
981 if ( *ludp->lud_host == '[' ) {
982 p = LDAP_STRDUP(ludp->lud_host+1);
983 /* copied, make sure we free source later */
984 specs[i] = ludp->lud_host;
986 p = strchr( ludp->lud_host, ']' );
988 return LDAP_PARAM_ERROR;
992 return LDAP_PARAM_ERROR;
1001 ldap_pvt_hex_unescape(p);
1002 ludp->lud_port = atoi(p);
1005 ldap_pvt_hex_unescape(ludp->lud_host);
1006 ludp->lud_scheme = LDAP_STRDUP("ldap");
1007 ludp->lud_next = *ludlist;
1011 /* this should be an array of NULLs now */
1012 /* except entries starting with [ */
1013 ldap_charray_free(specs);
1014 return LDAP_SUCCESS;
1018 ldap_url_list2hosts (LDAPURLDesc *ludlist)
1022 char *s, *p, buf[32]; /* big enough to hold a long decimal # (overkill) */
1024 if (ludlist == NULL)
1027 /* figure out how big the string is */
1028 size = 1; /* nul-term */
1029 for (ludp = ludlist; ludp != NULL; ludp = ludp->lud_next) {
1030 size += strlen(ludp->lud_host) + 1; /* host and space */
1031 if (strchr(ludp->lud_host, ':')) /* will add [ ] below */
1033 if (ludp->lud_port != 0)
1034 size += sprintf(buf, ":%d", ludp->lud_port);
1036 s = LDAP_MALLOC(size);
1041 for (ludp = ludlist; ludp != NULL; ludp = ludp->lud_next) {
1042 if (strchr(ludp->lud_host, ':')) {
1043 p += sprintf(p, "[%s]", ludp->lud_host);
1045 strcpy(p, ludp->lud_host);
1046 p += strlen(ludp->lud_host);
1048 if (ludp->lud_port != 0)
1049 p += sprintf(p, ":%d", ludp->lud_port);
1053 p--; /* nuke that extra space */
1060 LDAPURLDesc *ludlist )
1064 char *s, *p, buf[32]; /* big enough to hold a long decimal # (overkill) */
1066 if (ludlist == NULL)
1069 /* figure out how big the string is */
1070 size = 1; /* nul-term */
1071 for (ludp = ludlist; ludp != NULL; ludp = ludp->lud_next) {
1072 size += strlen(ludp->lud_scheme);
1073 if ( ludp->lud_host ) {
1074 size += strlen(ludp->lud_host);
1075 /* will add [ ] below */
1076 if (strchr(ludp->lud_host, ':'))
1079 size += sizeof(":/// ");
1081 if (ludp->lud_port != 0) {
1082 size += sprintf(buf, ":%d", ludp->lud_port);
1086 s = LDAP_MALLOC(size);
1092 for (ludp = ludlist; ludp != NULL; ludp = ludp->lud_next) {
1093 p += sprintf(p, "%s://", ludp->lud_scheme);
1094 if ( ludp->lud_host ) {
1095 p += sprintf(p, strchr(ludp->lud_host, ':')
1096 ? "[%s]" : "%s", ludp->lud_host);
1098 if (ludp->lud_port != 0)
1099 p += sprintf(p, ":%d", ludp->lud_port);
1104 p--; /* nuke that extra space */
1110 ldap_free_urllist( LDAPURLDesc *ludlist )
1112 LDAPURLDesc *ludp, *next;
1114 for (ludp = ludlist; ludp != NULL; ludp = next) {
1115 next = ludp->lud_next;
1116 ldap_free_urldesc(ludp);
1121 ldap_free_urldesc( LDAPURLDesc *ludp )
1123 if ( ludp == NULL ) {
1127 if ( ludp->lud_scheme != NULL ) {
1128 LDAP_FREE( ludp->lud_scheme );
1131 if ( ludp->lud_host != NULL ) {
1132 LDAP_FREE( ludp->lud_host );
1135 if ( ludp->lud_dn != NULL ) {
1136 LDAP_FREE( ludp->lud_dn );
1139 if ( ludp->lud_filter != NULL ) {
1140 LDAP_FREE( ludp->lud_filter);
1143 if ( ludp->lud_attrs != NULL ) {
1144 LDAP_VFREE( ludp->lud_attrs );
1147 if ( ludp->lud_exts != NULL ) {
1148 LDAP_VFREE( ludp->lud_exts );
1155 ldap_int_unhex( int c )
1157 return( c >= '0' && c <= '9' ? c - '0'
1158 : c >= 'A' && c <= 'F' ? c - 'A' + 10
1163 ldap_pvt_hex_unescape( char *s )
1166 * Remove URL hex escapes from s... done in place. The basic concept for
1167 * this routine is borrowed from the WWW library HTUnEscape() routine.
1171 for ( p = s; *s != '\0'; ++s ) {
1173 if ( *++s == '\0' ) {
1176 *p = ldap_int_unhex( *s ) << 4;
1177 if ( *++s == '\0' ) {
1180 *p++ += ldap_int_unhex( *s );