doubango/tinyNET/src/dns/tnet_dns_srv.c
c732d49e
 #if HAVE_CRT
 #define _CRTDBG_MAP_ALLOC 
 #include <stdlib.h> 
 #include <crtdbg.h>
 #endif //HAVE_CRT
 /*
74ca6d11
 * Copyright (C) 2020, University of the Basque Country (UPV/EHU)
c732d49e
 * Contact for licensing options: <licensing-mcpttclient(at)mcopenplatform(dot)com>
 *
 * The original file was part of Open Source Doubango Framework
 * Copyright (C) 2010-2011 Mamadou Diop.
 * Copyright (C) 2012 Doubango Telecom <http://doubango.org>
 *
 * This file is part of Open Source Doubango Framework.
 *
 * DOUBANGO is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * DOUBANGO is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with DOUBANGO.
 *
 */
 
 /**@file tnet_dns_srv.c
  * @brief DNS SeRVice locator record - RR - (RFC 2782).
  *
  * @author Mamadou Diop <diopmamadou(at)doubango[dot]org>
  *
 
  */
 #include "tnet_dns_srv.h"
 
 #include "../tnet_types.h"
 #include "../tnet_endianness.h"
 
 #include "tsk_string.h"
 #include "tsk_memory.h"
 
 /** Creates new DNS SRV Resource Record.
 */
 tnet_dns_srv_t* tnet_dns_srv_create(const char* name, tnet_dns_qclass_t qclass, uint32_t ttl, uint16_t rdlength, const void* data, tsk_size_t offset)
 {
 	return tsk_object_new(tnet_dns_srv_def_t, name, qclass, ttl, rdlength, data, offset);
 }
 
 //=================================================================================================
 //	[[DNS SRV]] object definition
 //
 static tsk_object_t* tnet_dns_srv_ctor(tsk_object_t * self, va_list * app)
 {
 	tnet_dns_srv_t *srv = self;
 	if(srv){
 		const char* name = va_arg(*app, const char*);
 		tnet_dns_qclass_t qclass = va_arg(*app, tnet_dns_qclass_t);
 		uint32_t ttl = va_arg(*app, uint32_t);
 		uint16_t rdlength = tsk_va_arg_u16(*app);
 		const void* data = va_arg(*app, const void*);
 		tsk_size_t offset = va_arg(*app, tsk_size_t);
 
 		/* init base */
 		tnet_dns_rr_init(TNET_DNS_RR(srv), qtype_srv, qclass);
 		TNET_DNS_RR(srv)->name = tsk_strdup(name);
 		TNET_DNS_RR(srv)->rdlength = rdlength;
 		TNET_DNS_RR(srv)->ttl = ttl;
 
 		if(rdlength){
 			// ==> DESERIALIZATION
 			/* Priority */
 			srv->priority = tnet_ntohs_2(((uint8_t*)data) + offset),
 			offset += 2;
 			/* Weight */
 			srv->weight = tnet_ntohs_2(((uint8_t*)data) + offset),
 			offset += 2;
 			/* Port */
 			srv->port = tnet_ntohs_2(((uint8_t*)data) + offset),
 			offset += 2;
 			/* Target */
 			tnet_dns_rr_qname_deserialize(data, &(srv->target), &offset);
 		}
 	}
 	return self;
 }
 
 static tsk_object_t* tnet_dns_srv_dtor(tsk_object_t * self) 
 { 
 	tnet_dns_srv_t *srv = self;
 	if(srv){
 		/* deinit base */
 		tnet_dns_rr_deinit(TNET_DNS_RR(srv));
 
 		TSK_FREE(srv->target);
 	}
 	return self;
 }
 
 static int tnet_dns_srv_cmp(const tsk_object_t *obj1, const tsk_object_t *obj2)
 { 
 	const tnet_dns_rr_t* rr1 = obj1;
 	const tnet_dns_rr_t* rr2 = obj2;
 
 	if(rr1 && rr2 && (rr1->qtype==qtype_srv) && (rr2->qtype==qtype_srv)){
 		const tnet_dns_srv_t* srv1 = (tnet_dns_srv_t*)rr1;
 		const tnet_dns_srv_t* srv2 = (tnet_dns_srv_t*)rr2;
 
 		/* Compare priorities. */
 		if(srv1->priority < srv2->priority){ /* Lowest priority is tried first. */
 			return 1;
 		}
 		else if(srv1->priority > srv2->priority){
 			return -1;
 		}
 
 		/* Compare weight */
 		if(srv1->weight > srv2->weight){
 			return 1;
 		}
 		else if(srv1->weight < srv2->weight){
 			return -1;
 		}
 		
 		return 0;
 	}
 	else{
 		return -1;
 	}
 }
 
 static const tsk_object_def_t tnet_dns_srv_def_s =
 {
 	sizeof(tnet_dns_srv_t),
 	tnet_dns_srv_ctor,
 	tnet_dns_srv_dtor,
 	tnet_dns_srv_cmp,
 };
 const tsk_object_def_t *tnet_dns_srv_def_t = &tnet_dns_srv_def_s;