/*
 * Copyright 1998-2001 The OpenLDAP Foundation, All Rights Reserved.
 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
 *
 * Copyright 2001, Pierangelo Masarati, All rights reserved. <ando@sys-net.it>
 *
 * This work has been developed to fulfill the requirements
 * of SysNet s.n.c. <http:www.sys-net.it> and it has been donated
 * to the OpenLDAP Foundation in the hope that it may be useful
 * to the Open Source community, but WITHOUT ANY WARRANTY.
 *
 * Permission is granted to anyone to use this software for any purpose
 * on any computer system, and to alter it and redistribute it, subject
 * to the following restrictions:
 *
 * 1. The author and SysNet s.n.c. are not responsible for the consequences
 *    of use of this software, no matter how awful, even if they arise from 
 *    flaws in it.
 *
 * 2. The origin of this software must not be misrepresented, either by
 *    explicit claim or by omission.  Since few users ever read sources,
 *    credits should appear in the documentation.
 *
 * 3. Altered versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.  Since few users
 *    ever read sources, credits should appear in the documentation.
 *    SysNet s.n.c. cannot be responsible for the consequences of the
 *    alterations.
 *
 * 4. This notice may not be removed or altered.
 *
 *
 * This software is based on the backend back-ldap, implemented
 * by Howard Chu <hyc@highlandsun.com>, and modified by Mark Valence
 * <kurash@sassafras.com>, Pierangelo Masarati <ando@sys-net.it> and other
 * contributors. The contribution of the original software to the present
 * implementation is acknowledged in this copyright statement.
 *
 * A special acknowledgement goes to Howard for the overall architecture
 * (and for borrowing large pieces of code), and to Mark, who implemented
 * from scratch the attribute/objectclass mapping.
 *
 * The original copyright statement follows.
 *
 * Copyright 1999, Howard Chu, All rights reserved. <hyc@highlandsun.com>
 *
 * Permission is granted to anyone to use this software for any purpose
 * on any computer system, and to alter it and redistribute it, subject
 * to the following restrictions:
 *
 * 1. The author is not responsible for the consequences of use of this
 *    software, no matter how awful, even if they arise from flaws in it.
 *
 * 2. The origin of this software must not be misrepresented, either by
 *    explicit claim or by omission.  Since few users ever read sources,
 *    credits should appear in the documentation.
 *
 * 3. Altered versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.  Since few users
 *    ever read sources, credits should appear in the
 *    documentation.
 *
 * 4. This notice may not be removed or altered.
 *
 */

#include "portable.h"

#include <stdio.h>

#include <ac/string.h>
#include <ac/socket.h>

#include "slap.h"
#include "../back-ldap/back-ldap.h"
#include "back-meta.h"

extern int
suffix_massage_config(
		struct rewrite_info *info,
		int argc,
		char **argv
);

static struct metatarget *
new_target( void )
{
	struct metatarget *lt;
        struct ldapmapping *mapping;

	lt = ch_calloc( sizeof( struct metatarget ), 1 );
	if ( lt == NULL ) {
		return NULL;
	}

	lt->rwinfo = rewrite_info_init( REWRITE_MODE_USE_DEFAULT );
	if ( lt->rwinfo == NULL ) {
		free( lt );
                return NULL;
	}

	mapping = ch_calloc( 2, sizeof( struct ldapmapping ) );
        if ( mapping == NULL ) {
		free( lt );
		return NULL;
	}
	mapping->src = ch_strdup( "objectClass" );
	mapping->dst = ch_strdup( "objectClass" );
	mapping[ 1 ].src = mapping->src;
	mapping[ 1 ].dst = mapping->dst;

	avl_insert( &lt->at_map.map, ( caddr_t )mapping, 
			mapping_cmp, mapping_dup );
	avl_insert( &lt->at_map.remap, ( caddr_t )&mapping[ 1 ],
			mapping_cmp, mapping_dup );

	return lt;
}

int
meta_back_db_config(
		BackendDB	*be,
		const char	*fname,
		int		lineno,
		int		argc,
		char		**argv
)
{
	struct metainfo *li = ( struct metainfo * )be->be_private;

	if ( li == NULL ) {
		fprintf( stderr, 
	"%s: line %d: meta backend info is null!\n",
		    fname, lineno );
		return 1;
	}

	/* URI of server to query */
	if ( strcasecmp( argv[ 0 ], "uri" ) == 0 ) {
		int j, i = li->ntargets;
		LDAPURLDesc *ludp;
		char *last;
		
		if ( argc != 2 ) {
			fprintf( stderr,
	"%s: line %d: missing address"
	" in \"uri <protocol>://<server>[:port]/<naming context>\" line\n",
				fname, lineno );
			return 1;
		}
		
		++li->ntargets;

		li->targets = ch_realloc( li->targets, 
			sizeof( struct metatarget *)*li->ntargets );
		if ( li->targets == NULL ) {
			fprintf( stderr,
	"%s: line %d: out of memory while storing server name"
	" in \"uri <protocol>://<server>[:port]/<naming context>\" line\n",
				fname, lineno );
			return 1;
		}

		if ( ( li->targets[ i ] = new_target() ) == NULL ) {
			fprintf( stderr,
	"%s: line %d: unable to init server"
	" in \"uri <protocol>://<server>[:port]/<naming context>\" line\n",
				fname, lineno );
			return 1;
		}

		/*
		 * uri MUST be legal!
		 */
		if ( ldap_url_parse( argv[ 1 ], &ludp ) != LDAP_SUCCESS ) {
			fprintf( stderr,
	"%s: line %d: unable to parse URI"
	" in \"uri <protocol>://<server>[:port]/<naming context>\" line\n",
				fname, lineno );
			return 1;
		}

		/*
		 * uri MUST have the <dn> part!
		 */
		if ( ludp->lud_dn == NULL || ludp->lud_dn[ 0 ] == '\0' ) {
			fprintf( stderr,
	"%s: line %d: missing <naming context> "
	" in \"uri <protocol>://<server>[:port]/<naming context>\" line\n",
				fname, lineno );
			return 1;
		}

		/*
		 * copies and stores uri and suffix
		 */
		li->targets[ i ]->suffix = ch_strdup( ludp->lud_dn );
		li->targets[ i ]->uri = ch_strdup( argv[ 1 ] );
		last = strstr( li->targets[ i ]->uri,
				li->targets[ i ]->suffix );
		assert( last != NULL );
		last[ 0 ] = '\0'; /* wasting memory ... */
		
		/*
		 * Need to store the suffix in normalized form
		 */
		(void) dn_normalize( li->targets[ i ]->suffix );
		
		/*
		 * uri MUST be a branch of suffix!
		 */
#if 0 /* too strict a constraint */
		if ( select_backend( li->targets[ i ]->suffix, 0 ) != be ) {
			fprintf( stderr,
	"%s: line %d: <naming context> of URI does not refer to current backend"
	" in \"uri <protocol>://<server>[:port]/<naming context>\" line\n",
				fname, lineno );
			return 1;
		}
#else
		/*
		 * uri MUST be a branch of a suffix!
		 */
		if ( select_backend( li->targets[ i ]->suffix, 0 ) == NULL ) {
			fprintf( stderr,
	"%s: line %d: <naming context> of URI does not resolve to a backend"
	" in \"uri <protocol>://<server>[:port]/<naming context>\" line\n",
				fname, lineno );
			return 1;
		}
#endif

#if 0
		/*
		 * uri MUST not be used by other URIs!
		 *
		 * FIXME: this limitation may be removed,
		 * or worked out, at least, in some manner
		 */
		for ( j = 0; j < i-1; j++ ) {
			if ( strcmp( li->targets[ i ]->suffix,
					li->targets[ j ]->suffix ) == 0 ) {
				fprintf( stderr,
	"%s: line %d: naming context \"%s\" already used"
	" in \"uri <protocol>://<server>[:port]/<naming context>\" line\n",
					fname, lineno, last+1 );
				return 1;
			}
		}
#endif
		
		ldap_free_urldesc( ludp );

		Debug( LDAP_DEBUG_CONFIG,
	"==>meta_back_db_config: URI \"%s\", suffix \"%s\"%s\n",
			li->targets[ i ]->uri, li->targets[ i ]->suffix, "" );

	/* default target directive */
	} else if ( strcasecmp( argv[ 0 ], "default-target" ) == 0 ) {
		int i = li->ntargets-1;
		
		if ( argc == 1 ) {
 			if ( i < 0 ) {
				fprintf( stderr,
	"%s: line %d: \"default-target\" alone need be"
       	" inside a \"uri\" directive\n",
					fname, lineno );
				return 1;
			}
			li->defaulttarget = i;
		} else {
			if ( strcasecmp( argv[ 1 ], "none" ) == 0 ) {
				if ( i >= 0 ) {
					fprintf( stderr,
	"%s: line %d: \"default-target none\""
       	" should go before uri definitions\n",
						fname, lineno );
				}
				li->defaulttarget = META_DEFAULT_TARGET_NONE;
			} else {
				int n = atoi( argv[ 1 ] );
				if ( n < 1 || n >= i ) {
					fprintf( stderr,
	"%s: line %d: illegal target number %d\n",
						fname, lineno, n );
					return 1;
				}
				li->defaulttarget = n-1;
			}
		}
		
	/* ttl of dn cache */
	} else if ( strcasecmp( argv[ 0 ], "dncache-ttl" ) == 0 ) {
		if ( argc != 2 ) {
			fprintf( stderr,
	"%s: line %d: missing ttl in \"dncache-ttl <ttl>\" line\n",
				fname, lineno );
			return 1;
		}
		
		if ( strcasecmp( argv[ 1 ], "forever" ) == 0 ) {
			li->cache.ttl = META_DNCACHE_FOREVER;
		} else if ( strcasecmp( argv[ 1 ], "disabled" ) == 0 ) {
			li->cache.ttl = META_DNCACHE_DISABLED;
		} else {
			li->cache.ttl = atol( argv[ 1 ] );
		}

	/* name to use for meta_back_group */
	} else if ( strcasecmp( argv[ 0 ], "binddn" ) == 0 ) {
		int i = li->ntargets-1;

		if ( i < 0 ) {
			fprintf( stderr,
	"%s: line %d: need \"uri\" directive first\n",
				fname, lineno );
		}
		
		if ( argc != 2 ) {
			fprintf( stderr,
	"%s: line %d: missing name in \"binddn <name>\" line\n",
				fname, lineno );
			return 1;
		}
		li->targets[ i ]->binddn = ch_strdup( argv[ 1 ] );

	/* password to use for meta_back_group */
	} else if ( strcasecmp( argv[ 0 ], "bindpw" ) == 0 ) {
		int i = li->ntargets-1;

		if ( i < 0 ) {
			fprintf( stderr,
	"%s: line %d: need \"uri\" directive first\n",
				fname, lineno );
		}
		
		if ( argc != 2 ) {
			fprintf( stderr,
	"%s: line %d: missing password in \"bindpw <password>\" line\n",
			    fname, lineno );
			return 1;
		}
		li->targets[ i ]->bindpw = ch_strdup( argv[ 1 ] );
	
	/* dn massaging */
	} else if ( strcasecmp( argv[ 0 ], "suffixmassage" ) == 0 ) {
		BackendDB *tmp_be;
		int i = li->ntargets-1;

		if ( i < 0 ) {
			fprintf( stderr,
	"%s: line %d: need \"uri\" directive first\n",
				fname, lineno );
			return 1;
		}
		
		/*
		 * syntax:
		 * 
		 * 	suffixmassage <suffix> <massaged suffix>
		 *
		 * the <suffix> field must be defined as a valid suffix
		 * (or suffixAlias?) for the current database;
		 * the <massaged suffix> shouldn't have already been
		 * defined as a valid suffix or suffixAlias for the 
		 * current server
		 */
		if ( argc != 3 ) {
 			fprintf( stderr,
	"%s: line %d: syntax is \"suffixMassage <suffix> <massaged suffix>\"\n",
				fname, lineno );
			return 1;
		}
		
		tmp_be = select_backend( argv[ 1 ], 0 );
		if ( tmp_be != NULL && tmp_be != be ) {
			fprintf( stderr, 
	"%s: line %d: suffix already in use by another backend in"
	" \"suffixMassage <suffix> <massaged suffix>\"\n",
				fname, lineno );
			return 1;						
		}

		tmp_be = select_backend( argv[ 2 ], 0 );
		if ( tmp_be != NULL ) {
			fprintf( stderr,
	"%s: line %d: massaged suffix already in use by another backend in" 
	" \"suffixMassage <suffix> <massaged suffix>\"\n",
                                fname, lineno );
                        return 1;
		}
		
		/*
		 * The suffix massaging is emulated by means of the
		 * rewrite capabilities
		 * FIXME: no extra rewrite capabilities should be added
		 * to the database
		 */
	 	return suffix_massage_config( li->targets[ i ]->rwinfo,
				argc, argv );
		
	/* rewrite stuff ... */
 	} else if ( strncasecmp( argv[ 0 ], "rewrite", 7 ) == 0 ) {
		int i = li->ntargets-1;

		if ( i < 0 ) {
			fprintf( stderr,
	"%s: line %d: need \"uri\" directive first\n",
				fname, lineno );
		}
		
 		return rewrite_parse( li->targets[ i ]->rwinfo, fname, lineno,
				argc, argv );

	/* objectclass/attribute mapping */
	} else if ( strcasecmp( argv[ 0 ], "map" ) == 0 ) {
		struct ldapmap *map;
		struct ldapmapping *mapping;
		char *src, *dst;
		int i = li->ntargets-1;

		if ( i < 0 ) {
			fprintf( stderr,
	"%s: line %d: need \"uri\" directive first\n",
				fname, lineno );
		}
		

		if ( argc < 3 || argc > 4 ) {
			fprintf( stderr,
	"%s: line %d: syntax is \"map {objectclass | attribute} {<source> | *} [<dest> | *]\"\n",
				fname, lineno );
			return 1;
		}

		if ( strcasecmp( argv[ 1 ], "objectClass" ) == 0 ) {
			map = &li->targets[ i ]->oc_map;
		} else if ( strcasecmp( argv[ 1 ], "attribute" ) == 0 ) {
			map = &li->targets[ i ]->at_map;
		} else {
			fprintf( stderr,
	"%s: line %d: syntax is \"map {objectclass | attribute} {<source> | *} [<dest> | *]\"\n",
				fname, lineno );
			return 1;
		}

		if ( strcasecmp( argv[ 2 ], "*" ) != 0 ) {
			src = argv[ 2 ];
			if ( argc < 4 ) {
				dst = "";
			} else if ( strcasecmp( argv[ 3 ], "*" ) == 0 ) {
				dst = src;
			} else {
				dst = argv[ 3 ];
			}
		} else {
			if ( argc < 4 ) {
				map->drop_missing = 1;
				return 0;
			}
			if ( strcasecmp( argv[ 3 ], "*" ) == 0 ) {
				map->drop_missing = 0;
				return 0;
			}

			src = argv[ 3 ];
			dst = src;
		}

		if ( ( map == &li->targets[ i ]->at_map )
			&& ( strcasecmp( src, "objectclass" ) == 0
				|| strcasecmp( dst, "objectclass" ) == 0 ) ) {
			fprintf( stderr,
	"%s: line %d: objectclass attribute cannot be mapped\n",
				fname, lineno );
		}

		mapping = ch_calloc( 2, sizeof( struct ldapmapping ) );
		if ( mapping == NULL ) {
			fprintf( stderr,
				"%s: line %d: out of memory\n",
				fname, lineno );
			return 1;
		}
		mapping->src = ch_strdup( src );
		mapping->dst = ch_strdup( dst );
		if ( *dst != 0 ) {
			mapping[ 1 ].src = mapping->dst;
			mapping[ 1 ].dst = mapping->src;
		} else {
			mapping[ 1 ].src = mapping->src;
			mapping[ 1 ].dst = mapping->dst;
		}

		if ( avl_find( map->map, ( caddr_t )mapping,
				mapping_cmp ) != NULL
			|| avl_find( map->remap, ( caddr_t )&mapping[ 1 ],
				mapping_cmp ) != NULL) {
			fprintf( stderr,
	"%s: line %d: duplicate mapping found (ignored)\n",
				fname, lineno );
			return 0;
		}

		avl_insert( &map->map, ( caddr_t )mapping,
					mapping_cmp, mapping_dup );
		avl_insert( &map->remap, ( caddr_t )&mapping[ 1 ],
					mapping_cmp, mapping_dup );

	/* anything else */
	} else {
		fprintf( stderr,
	"%s: line %d: unknown directive \"%s\" in meta database definition"
	" (ignored)\n",
		    fname, lineno, argv[0] );
	}
	return 0;
}