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Annotation of embedaddon/strongswan/src/libstrongswan/plugins/unbound/unbound_rr.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2012 Reto Guadagnini
        !             3:  * HSR Hochschule fuer Technik Rapperswil
        !             4:  *
        !             5:  * This program is free software; you can redistribute it and/or modify it
        !             6:  * under the terms of the GNU General Public License as published by the
        !             7:  * Free Software Foundation; either version 2 of the License, or (at your
        !             8:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
        !             9:  *
        !            10:  * This program is distributed in the hope that it will be useful, but
        !            11:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            12:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
        !            13:  * for more details.
        !            14:  */
        !            15: 
        !            16: #include <resolver/rr.h>
        !            17: 
        !            18: #include <library.h>
        !            19: #include <utils/debug.h>
        !            20: 
        !            21: #include <stdlib.h>
        !            22: #include <string.h>
        !            23: 
        !            24: #include "unbound_rr.h"
        !            25: 
        !            26: typedef struct private_unbound_rr_t private_unbound_rr_t;
        !            27: 
        !            28: /**
        !            29:  * private data of an unbound_rr_t object.
        !            30:  */
        !            31: struct private_unbound_rr_t {
        !            32: 
        !            33:        /**
        !            34:         * Public data
        !            35:         */
        !            36:        unbound_rr_t public;
        !            37: 
        !            38:        /**
        !            39:         * Owner name
        !            40:         */
        !            41:        char* name;
        !            42: 
        !            43:        /**
        !            44:         * Type
        !            45:         */
        !            46:        rr_type_t type;
        !            47: 
        !            48:        /**
        !            49:         * Class
        !            50:         */
        !            51:        rr_class_t class;
        !            52: 
        !            53:        /**
        !            54:         * TTL
        !            55:         */
        !            56:        uint32_t ttl;
        !            57: 
        !            58:        /**
        !            59:         * Size of the rdata field in octets
        !            60:         */
        !            61:        uint16_t size;
        !            62: 
        !            63:        /**
        !            64:         * RDATA field (array of bytes in network order)
        !            65:         */
        !            66:        u_char *rdata;
        !            67: };
        !            68: 
        !            69: METHOD(rr_t, get_name, char *,
        !            70:        private_unbound_rr_t *this)
        !            71: {
        !            72:        return this->name;
        !            73: }
        !            74: 
        !            75: METHOD(rr_t, get_type, rr_type_t,
        !            76:        private_unbound_rr_t *this)
        !            77: {
        !            78:        return this->type;
        !            79: }
        !            80: 
        !            81: METHOD(rr_t, get_class, rr_class_t,
        !            82:        private_unbound_rr_t *this)
        !            83: {
        !            84:        return this->class;
        !            85: }
        !            86: 
        !            87: METHOD(rr_t, get_ttl, uint32_t,
        !            88:        private_unbound_rr_t *this)
        !            89: {
        !            90:        return this->ttl;
        !            91: }
        !            92: 
        !            93: METHOD(rr_t, get_rdata, chunk_t,
        !            94:        private_unbound_rr_t *this)
        !            95: {
        !            96:        return chunk_create(this->rdata, this->size);
        !            97: }
        !            98: 
        !            99: METHOD(rr_t, destroy, void,
        !           100:        private_unbound_rr_t *this)
        !           101: {
        !           102:        free(this->name);
        !           103:        free(this->rdata);
        !           104:        free(this);
        !           105: }
        !           106: 
        !           107: /*
        !           108:  * Described in header.
        !           109:  */
        !           110: unbound_rr_t *unbound_rr_create_frm_ldns_rr(ldns_rr *rr)
        !           111: {
        !           112:        private_unbound_rr_t *this;
        !           113:        ldns_status status;
        !           114:        ldns_buffer *buf;
        !           115:        int i;
        !           116: 
        !           117:        INIT(this,
        !           118:                .public = {
        !           119:                        .interface = {
        !           120:                                .get_name = _get_name,
        !           121:                                .get_type = _get_type,
        !           122:                                .get_class = _get_class,
        !           123:                                .get_ttl = _get_ttl,
        !           124:                                .get_rdata = _get_rdata,
        !           125:                                .destroy = _destroy,
        !           126:                        },
        !           127:                },
        !           128:        );
        !           129: 
        !           130:        this->name = ldns_rdf2str(ldns_rr_owner(rr));
        !           131:        if (!this->name)
        !           132:        {
        !           133:                DBG1(DBG_LIB, "failed to parse the owner name of a DNS RR");
        !           134:                _destroy(this);
        !           135:                return NULL;
        !           136:        }
        !           137: 
        !           138:        this->type = (rr_type_t)ldns_rr_get_type(rr);
        !           139:        this->class = (rr_class_t)ldns_rr_get_class(rr);
        !           140:        this->ttl = ldns_rr_ttl(rr);
        !           141:        for(i = 0; i < ldns_rr_rd_count(rr); i++)
        !           142:        {
        !           143:                this->size += ldns_rdf_size(ldns_rr_rdf(rr, i));
        !           144:        }
        !           145: 
        !           146:        /**
        !           147:         * The ldns library splits the RDATA field of a RR in various rdf.
        !           148:         * Here we reassemble these rdf to get the RDATA field of the RR.
        !           149:         */
        !           150:        buf = ldns_buffer_new(LDNS_MIN_BUFLEN);
        !           151:        /* The buffer will be resized automatically by ldns_rr_rdata2buffer_wire() */
        !           152:        status = ldns_rr_rdata2buffer_wire(buf, rr);
        !           153: 
        !           154:        if (status != LDNS_STATUS_OK)
        !           155:        {
        !           156:                DBG1(DBG_LIB, "failed to get the RDATA field of a DNS RR");
        !           157:                ldns_buffer_free(buf);
        !           158:                _destroy(this);
        !           159:                return NULL;
        !           160:        }
        !           161: 
        !           162:        this->rdata = ldns_buffer_export(buf);
        !           163:        ldns_buffer_free(buf);
        !           164: 
        !           165:        return &this->public;
        !           166: }