int reply_info_parse(sldns_buffer* pkt, struct alloc_cache* alloc,
struct query_info* qinf, struct reply_info** rep,
struct regional* region, struct edns_data* edns)
{
/* use scratch pad region-allocator during parsing. */
struct msg_parse* msg;
int ret;
qinf->qname = NULL;
*rep = NULL;
if(!(msg = regional_alloc(region, sizeof(*msg)))) {
return LDNS_RCODE_SERVFAIL;
}
memset(msg, 0, sizeof(*msg));
sldns_buffer_set_position(pkt, 0);
if((ret = parse_packet(pkt, msg, region)) != 0) {
return ret;
}
if((ret = parse_extract_edns(msg, edns)) != 0)
return ret;
/* parse OK, allocate return structures */
/* this also performs dname decompression */
if(!parse_create_msg(pkt, msg, alloc, qinf, rep, NULL)) {
query_info_clear(qinf);
reply_info_parsedelete(*rep, alloc);
*rep = NULL;
return LDNS_RCODE_SERVFAIL;
}
return 0;
}
/* Create response according to the ldns packet content */
int createResponse(struct module_qstate* qstate, sldns_buffer* pkt)
{
struct msg_parse* prs;
struct edns_data edns;
/* parse message */
prs = (struct msg_parse*) regional_alloc(qstate->env->scratch, sizeof(struct msg_parse));
if (!prs) {
log_err("storeResponse: out of memory on incoming message");
return 0;
}
memset(prs, 0, sizeof(*prs));
memset(&edns, 0, sizeof(edns));
sldns_buffer_set_position(pkt, 0);
if (parse_packet(pkt, prs, qstate->env->scratch) != LDNS_RCODE_NOERROR) {
verbose(VERB_ALGO, "storeResponse: parse error on reply packet");
return 0;
}
/* edns is not examined, but removed from message to help cache */
if(parse_extract_edns(prs, &edns) != LDNS_RCODE_NOERROR)
return 0;
/* remove CD-bit, we asked for in case we handle validation ourself */
prs->flags &= ~BIT_CD;
/* allocate response dns_msg in region */
qstate->return_msg = (struct dns_msg*)regional_alloc(qstate->region, sizeof(struct dns_msg));
if (!qstate->return_msg)
return 0;
memset(qstate->return_msg, 0, sizeof(*qstate->return_msg));
if(!parse_create_msg(pkt, prs, NULL, &(qstate->return_msg)->qinfo, &(qstate->return_msg)->rep, qstate->region)) {
log_err("storeResponse: malloc failure: allocating incoming dns_msg");
return 0;
}
/* Make sure that the RA flag is set (since the presence of
* this module means that recursion is available) */
/* qstate->return_msg->rep->flags |= BIT_RA; */
/* Clear the AA flag */
/* FIXME: does this action go here or in some other module? */
/*qstate->return_msg->rep->flags &= ~BIT_AA; */
/* make sure QR flag is on */
/*qstate->return_msg->rep->flags |= BIT_QR; */
if(verbosity >= VERB_ALGO)
log_dns_msg("storeResponse: packet:", &qstate->return_msg->qinfo, qstate->return_msg->rep);
return 1;
}
struct dns_msg*
dns_alloc_msg(sldns_buffer* pkt, struct msg_parse* msg,
struct regional* region)
{
struct dns_msg* m = (struct dns_msg*)regional_alloc(region,
sizeof(struct dns_msg));
if(!m)
return NULL;
memset(m, 0, sizeof(*m));
if(!parse_create_msg(pkt, msg, NULL, &m->qinfo, &m->rep, region)) {
log_err("malloc failure: allocating incoming dns_msg");
return NULL;
}
return m;
}
/** get msg reply struct (in temp region) */
static struct reply_info*
parse_reply(ldns_buffer* pkt, struct regional* region, struct query_info* qi)
{
struct reply_info* rep;
struct msg_parse* msg;
if(!(msg = regional_alloc(region, sizeof(*msg)))) {
return NULL;
}
memset(msg, 0, sizeof(*msg));
ldns_buffer_set_position(pkt, 0);
if(parse_packet(pkt, msg, region) != 0)
return 0;
if(!parse_create_msg(pkt, msg, NULL, qi, &rep, region)) {
return 0;
}
return rep;
}
