/*	$NetBSD: error.c,v 1.3 2021/08/14 16:14:55 christos Exp $	*/

/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1998-2021 The OpenLDAP Foundation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */

#include <sys/cdefs.h>
__RCSID("$NetBSD: error.c,v 1.3 2021/08/14 16:14:55 christos Exp $");

#include "portable.h"

#include <stdio.h>

#include <ac/stdlib.h>

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

#include "ldap-int.h"

void ldap_int_error_init( void ) {
}

char *
ldap_err2string( int err )
{
	char *m;

	Debug0( LDAP_DEBUG_TRACE, "ldap_err2string\n" );

	switch ( err ) {
#	define C(code, message) case code: m = message; break

	/* LDAPv3 (RFC 4511) codes */
	C(LDAP_SUCCESS,					N_("Success"));
	C(LDAP_OPERATIONS_ERROR, 		N_("Operations error"));
	C(LDAP_PROTOCOL_ERROR, 			N_("Protocol error"));
	C(LDAP_TIMELIMIT_EXCEEDED,		N_("Time limit exceeded"));
	C(LDAP_SIZELIMIT_EXCEEDED, 		N_("Size limit exceeded"));
	C(LDAP_COMPARE_FALSE, 			N_("Compare False"));
	C(LDAP_COMPARE_TRUE, 			N_("Compare True"));
	C(LDAP_STRONG_AUTH_NOT_SUPPORTED,N_("Authentication method not supported"));
	C(LDAP_STRONG_AUTH_REQUIRED,	N_("Strong(er) authentication required"));

	C(LDAP_REFERRAL,				N_("Referral"));
	C(LDAP_ADMINLIMIT_EXCEEDED,		N_("Administrative limit exceeded"));
	C(LDAP_UNAVAILABLE_CRITICAL_EXTENSION,
									N_("Critical extension is unavailable"));
	C(LDAP_CONFIDENTIALITY_REQUIRED,N_("Confidentiality required"));
	C(LDAP_SASL_BIND_IN_PROGRESS,	N_("SASL bind in progress"));

	C(LDAP_NO_SUCH_ATTRIBUTE, 		N_("No such attribute"));
	C(LDAP_UNDEFINED_TYPE, 			N_("Undefined attribute type"));
	C(LDAP_INAPPROPRIATE_MATCHING, 	N_("Inappropriate matching"));
	C(LDAP_CONSTRAINT_VIOLATION, 	N_("Constraint violation"));
	C(LDAP_TYPE_OR_VALUE_EXISTS, 	N_("Type or value exists"));
	C(LDAP_INVALID_SYNTAX, 			N_("Invalid syntax"));

	C(LDAP_NO_SUCH_OBJECT, 			N_("No such object"));
	C(LDAP_ALIAS_PROBLEM, 			N_("Alias problem"));
	C(LDAP_INVALID_DN_SYNTAX,		N_("Invalid DN syntax"));

	C(LDAP_ALIAS_DEREF_PROBLEM,	 	N_("Alias dereferencing problem"));

	C(LDAP_INAPPROPRIATE_AUTH, 		N_("Inappropriate authentication"));
	C(LDAP_INVALID_CREDENTIALS, 	N_("Invalid credentials"));
	C(LDAP_INSUFFICIENT_ACCESS, 	N_("Insufficient access"));
	C(LDAP_BUSY, 					N_("Server is busy"));
	C(LDAP_UNAVAILABLE, 			N_("Server is unavailable"));
	C(LDAP_UNWILLING_TO_PERFORM, 	N_("Server is unwilling to perform"));
	C(LDAP_LOOP_DETECT, 			N_("Loop detected"));

	C(LDAP_NAMING_VIOLATION, 		N_("Naming violation"));
	C(LDAP_OBJECT_CLASS_VIOLATION, 	N_("Object class violation"));
	C(LDAP_NOT_ALLOWED_ON_NONLEAF, 	N_("Operation not allowed on non-leaf"));
	C(LDAP_NOT_ALLOWED_ON_RDN,	 	N_("Operation not allowed on RDN"));
	C(LDAP_ALREADY_EXISTS, 			N_("Already exists"));
	C(LDAP_NO_OBJECT_CLASS_MODS, 	N_("Cannot modify object class"));

	C(LDAP_AFFECTS_MULTIPLE_DSAS,	N_("Operation affects multiple DSAs"));

	/* Virtual List View draft */
	C(LDAP_VLV_ERROR,				N_("Virtual List View error"));

	C(LDAP_OTHER, N_("Other (e.g., implementation specific) error"));

	/* LDAPv2 (RFC 1777) codes */
	C(LDAP_PARTIAL_RESULTS, N_("Partial results and referral received"));
	C(LDAP_IS_LEAF, 				N_("Entry is a leaf"));

	/* Connection-less LDAP (CLDAP - RFC 1798) code */
	C(LDAP_RESULTS_TOO_LARGE,		N_("Results too large"));

	/* Cancel Operation (RFC 3909) codes */
	C(LDAP_CANCELLED,				N_("Cancelled"));
	C(LDAP_NO_SUCH_OPERATION,		N_("No Operation to Cancel"));
	C(LDAP_TOO_LATE,				N_("Too Late to Cancel"));
	C(LDAP_CANNOT_CANCEL,			N_("Cannot Cancel"));

	/* Assert Control (RFC 4528 and old internet-draft) codes */
	C(LDAP_ASSERTION_FAILED,		N_("Assertion Failed"));
	C(LDAP_X_ASSERTION_FAILED,		N_("Assertion Failed (X)"));

	/* Proxied Authorization Control (RFC 4370 and I-D) codes */
	C(LDAP_PROXIED_AUTHORIZATION_DENIED, N_("Proxied Authorization Denied"));
	C(LDAP_X_PROXY_AUTHZ_FAILURE,	N_("Proxy Authorization Failure (X)"));

	/* Content Sync Operation (RFC 4533 and I-D) codes */
	C(LDAP_SYNC_REFRESH_REQUIRED,	N_("Content Sync Refresh Required"));
	C(LDAP_X_SYNC_REFRESH_REQUIRED,	N_("Content Sync Refresh Required (X)"));

	/* No-Op Control (draft-zeilenga-ldap-noop) code */
	C(LDAP_X_NO_OPERATION,			N_("No Operation (X)"));

	/* Client Update Protocol (RFC 3928) codes */
	C(LDAP_CUP_RESOURCES_EXHAUSTED,	N_("LCUP Resources Exhausted"));
	C(LDAP_CUP_SECURITY_VIOLATION,	N_("LCUP Security Violation"));
	C(LDAP_CUP_INVALID_DATA,		N_("LCUP Invalid Data"));
	C(LDAP_CUP_UNSUPPORTED_SCHEME,	N_("LCUP Unsupported Scheme"));
	C(LDAP_CUP_RELOAD_REQUIRED,		N_("LCUP Reload Required"));

	C(LDAP_TXN_SPECIFY_OKAY,		N_("TXN specify okay"));
	C(LDAP_TXN_ID_INVALID,			N_("TXN ID is invalid"));

	/* API codes - renumbered since draft-ietf-ldapext-ldap-c-api */
	C(LDAP_SERVER_DOWN,				N_("Can't contact LDAP server"));
	C(LDAP_LOCAL_ERROR,				N_("Local error"));
	C(LDAP_ENCODING_ERROR,			N_("Encoding error"));
	C(LDAP_DECODING_ERROR,			N_("Decoding error"));
	C(LDAP_TIMEOUT,					N_("Timed out"));
	C(LDAP_AUTH_UNKNOWN,			N_("Unknown authentication method"));
	C(LDAP_FILTER_ERROR,			N_("Bad search filter"));
	C(LDAP_USER_CANCELLED,			N_("User cancelled operation"));
	C(LDAP_PARAM_ERROR,				N_("Bad parameter to an ldap routine"));
	C(LDAP_NO_MEMORY,				N_("Out of memory"));
	C(LDAP_CONNECT_ERROR,			N_("Connect error"));
	C(LDAP_NOT_SUPPORTED,			N_("Not Supported"));
	C(LDAP_CONTROL_NOT_FOUND,		N_("Control not found"));
	C(LDAP_NO_RESULTS_RETURNED,		N_("No results returned"));
	C(LDAP_MORE_RESULTS_TO_RETURN,	N_("More results to return"));
	C(LDAP_CLIENT_LOOP,				N_("Client Loop"));
	C(LDAP_REFERRAL_LIMIT_EXCEEDED,	N_("Referral Limit Exceeded"));
	C(LDAP_X_CONNECTING,			N_("Connecting (X)"));
#	undef C

	default:
		m = (LDAP_API_ERROR(err) ? N_("Unknown API error")
			 : LDAP_E_ERROR(err) ? N_("Unknown (extension) error")
			 : LDAP_X_ERROR(err) ? N_("Unknown (private extension) error")
			 : N_("Unknown error"));
		break;
	}

	return _(m);
}

/* deprecated */
void
ldap_perror( LDAP *ld, LDAP_CONST char *str )
{
    int i;

	assert( ld != NULL );
	assert( LDAP_VALID( ld ) );
	assert( str != NULL );

	fprintf( stderr, "%s: %s (%d)\n",
		str ? str : "ldap_perror",
		ldap_err2string( ld->ld_errno ),
		ld->ld_errno );

	if ( ld->ld_matched != NULL && ld->ld_matched[0] != '\0' ) {
		fprintf( stderr, _("\tmatched DN: %s\n"), ld->ld_matched );
	}

	if ( ld->ld_error != NULL && ld->ld_error[0] != '\0' ) {
		fprintf( stderr, _("\tadditional info: %s\n"), ld->ld_error );
	}

	if ( ld->ld_referrals != NULL && ld->ld_referrals[0] != NULL) {
		fprintf( stderr, _("\treferrals:\n") );
		for (i=0; ld->ld_referrals[i]; i++) {
			fprintf( stderr, _("\t\t%s\n"), ld->ld_referrals[i] );
		}
	}

	fflush( stderr );
}

/* deprecated */
int
ldap_result2error( LDAP *ld, LDAPMessage *r, int freeit )
{
	int rc, err;

	rc = ldap_parse_result( ld, r, &err,
		NULL, NULL, NULL, NULL, freeit );

	return err != LDAP_SUCCESS ? err : rc;
}

/*
 * Parse LDAPResult Messages:
 *
 *   LDAPResult ::= SEQUENCE {
 *     resultCode      ENUMERATED,
 *     matchedDN       LDAPDN,
 *     errorMessage    LDAPString,
 *     referral        [3] Referral OPTIONAL }
 *
 * including Bind results:
 *
 *   BindResponse ::= [APPLICATION 1] SEQUENCE {
 *     COMPONENTS OF LDAPResult,
 *     serverSaslCreds  [7] OCTET STRING OPTIONAL }
 *
 * and ExtendedOp results:
 *
 *   ExtendedResponse ::= [APPLICATION 24] SEQUENCE {
 *     COMPONENTS OF LDAPResult,
 *     responseName     [10] LDAPOID OPTIONAL,
 *     response         [11] OCTET STRING OPTIONAL }
 *
 */
int
ldap_parse_result(
	LDAP			*ld,
	LDAPMessage		*r,
	int				*errcodep,
	char			**matcheddnp,
	char			**errmsgp,
	char			***referralsp,
	LDAPControl		***serverctrls,
	int				freeit )
{
	LDAPMessage	*lm;
	ber_int_t errcode = LDAP_SUCCESS;

	ber_tag_t tag;
	BerElement	*ber;

	Debug0( LDAP_DEBUG_TRACE, "ldap_parse_result\n" );

	assert( ld != NULL );
	assert( LDAP_VALID( ld ) );
	assert( r != NULL );

	if(errcodep != NULL) *errcodep = LDAP_SUCCESS;
	if(matcheddnp != NULL) *matcheddnp = NULL;
	if(errmsgp != NULL) *errmsgp = NULL;
	if(referralsp != NULL) *referralsp = NULL;
	if(serverctrls != NULL) *serverctrls = NULL;

	LDAP_MUTEX_LOCK( &ld->ld_res_mutex );
	/* Find the result, last msg in chain... */
	lm = r->lm_chain_tail;
	/* FIXME: either this is not possible (assert?)
	 * or it should be handled */
	if ( lm != NULL ) {
		switch ( lm->lm_msgtype ) {
		case LDAP_RES_SEARCH_ENTRY:
		case LDAP_RES_SEARCH_REFERENCE:
		case LDAP_RES_INTERMEDIATE:
			lm = NULL;
			break;

		default:
			break;
		}
	}

	if( lm == NULL ) {
		errcode = ld->ld_errno = LDAP_NO_RESULTS_RETURNED;
		LDAP_MUTEX_UNLOCK( &ld->ld_res_mutex );
	    goto done;
	}

	if ( ld->ld_error ) {
		LDAP_FREE( ld->ld_error );
		ld->ld_error = NULL;
	}
	if ( ld->ld_matched ) {
		LDAP_FREE( ld->ld_matched );
		ld->ld_matched = NULL;
	}
	if ( ld->ld_referrals ) {
		LDAP_VFREE( ld->ld_referrals );
		ld->ld_referrals = NULL;
	}

	/* parse results */

	ber = ber_dup( lm->lm_ber );

	if ( ld->ld_version < LDAP_VERSION2 ) {
		tag = ber_scanf( ber, "{iA}",
			&ld->ld_errno, &ld->ld_error );

	} else {
		ber_len_t len;

		tag = ber_scanf( ber, "{iAA" /*}*/,
			&ld->ld_errno, &ld->ld_matched, &ld->ld_error );

		if( tag != LBER_ERROR ) {
			/* peek for referrals */
			if( ber_peek_tag(ber, &len) == LDAP_TAG_REFERRAL ) {
				tag = ber_scanf( ber, "v", &ld->ld_referrals );
			}
		}

		/* need to clean out misc items */
		if( tag != LBER_ERROR ) {
			if( lm->lm_msgtype == LDAP_RES_BIND ) {
				/* look for sasl result credentials */
				if ( ber_peek_tag( ber, &len ) == LDAP_TAG_SASL_RES_CREDS ) {
					/* skip 'em */
					tag = ber_scanf( ber, "x" );
				}

			} else if( lm->lm_msgtype == LDAP_RES_EXTENDED ) {
				/* look for exop result oid or value */
				if ( ber_peek_tag( ber, &len ) == LDAP_TAG_EXOP_RES_OID ) {
					/* skip 'em */
					tag = ber_scanf( ber, "x" );
				}

				if ( tag != LBER_ERROR &&
					ber_peek_tag( ber, &len ) == LDAP_TAG_EXOP_RES_VALUE )
				{
					/* skip 'em */
					tag = ber_scanf( ber, "x" );
				}
			}
		}

		if( tag != LBER_ERROR ) {
			int rc = ldap_pvt_get_controls( ber, serverctrls );

			if( rc != LDAP_SUCCESS ) {
				tag = LBER_ERROR;
			}
		}

		if( tag != LBER_ERROR ) {
			tag = ber_scanf( ber, /*{*/"}" );
		}
	}

	if ( tag == LBER_ERROR ) {
		ld->ld_errno = errcode = LDAP_DECODING_ERROR;
	}

	if( ber != NULL ) {
		ber_free( ber, 0 );
	}

	/* return */
	if( errcodep != NULL ) {
		*errcodep = ld->ld_errno;
	}
	if ( errcode == LDAP_SUCCESS ) {
		if( matcheddnp != NULL ) {
			if ( ld->ld_matched )
			{
				*matcheddnp = LDAP_STRDUP( ld->ld_matched );
			}
		}
		if( errmsgp != NULL ) {
			if ( ld->ld_error )
			{
				*errmsgp = LDAP_STRDUP( ld->ld_error );
			}
		}

		if( referralsp != NULL) {
			*referralsp = ldap_value_dup( ld->ld_referrals );
		}
	}
	LDAP_MUTEX_UNLOCK( &ld->ld_res_mutex );

done:
	if ( freeit ) {
		ldap_msgfree( r );
	}

	return errcode;
}