Function dns_naptr_parser

resolve.c:869–909

! \brief parses the naptr record into a naptr_rdata structure * \param msg - pointer to the dns message * \param end - pointer to the end of the message * \param rdata - pointer to the rdata part of the naptr answer * \return 0 on error, or a dyn. alloc'ed naptr_rdata structure * * NAPTR rdata format: * 111111 * 0123456789012345 * +----------------+ * | ord

 * +----------------+
 */
struct naptr_rdata* dns_naptr_parser( unsigned char* msg, unsigned char* end,
								  unsigned char* rdata)
{
	struct naptr_rdata* naptr;

	naptr = 0;
	if ((rdata + 7) >= end)
		goto error;
	naptr=(struct naptr_rdata*)local_malloc(sizeof(struct naptr_rdata));
	if (naptr == 0){
		LM_ERR("out of pkg memory\n");
		goto error;
	}

	memcpy((void*)&naptr->order, rdata, 2);
	naptr->order=ntohs(naptr->order);
	memcpy((void*)&naptr->pref, rdata + 2, 2);
	naptr->pref=ntohs(naptr->pref);
	naptr->flags_len = (int)rdata[4];
	if ((rdata + 7 +  naptr->flags_len) >= end)
		goto error;
	memcpy((void*)&naptr->flags, rdata + 5, naptr->flags_len);
	naptr->services_len = (int)rdata[5 + naptr->flags_len];
	if ((rdata + 7 + naptr->flags_len + naptr->services_len) >= end) goto error;
	memcpy((void*)&naptr->services, rdata + 6 + naptr->flags_len, naptr->services_len);
	naptr->regexp_len = (int)rdata[6 + naptr->flags_len + naptr->services_len];
	if ((rdata + 7 + naptr->flags_len + naptr->services_len + naptr->regexp_len) >= end)
		goto error;
	memcpy((void*)&naptr->regexp, rdata + 7 + naptr->flags_len +
				naptr->services_len, naptr->regexp_len);
	rdata = rdata + 7 + naptr->flags_len + naptr->services_len + naptr->regexp_len;
	naptr->repl_len=dn_expand(msg, end, rdata, naptr->repl, MAX_DNS_NAME-1);
	if ( naptr->repl_len==(unsigned int)-1 )
		goto error;
	/* add terminating 0 ? (warning: len=compressed name len) */
	return naptr;
error:
	if (naptr)
		local_free(naptr);
	return 0;
}