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EDNS for the client.

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git-svn-id: file:///svn/unbound/trunk@288 be551aaa-1e26-0410-a405-d3ace91eadb9
This commit is contained in:
Wouter Wijngaards
2007-05-07 13:17:27 +00:00
parent 841d09ff08
commit f3c0cd34d8
8 changed files with 156 additions and 16 deletions
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util/data/msgparse.c
+31
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@@ -904,3 +904,34 @@ parse_extract_edns(struct msg_parse* msg, struct edns_data* edns)
/* ignore rdata and rrsigs */
return 0;
}
int
parse_edns_from_pkt(ldns_buffer* pkt, struct edns_data* edns)
{
log_assert(LDNS_QDCOUNT(ldns_buffer_begin(pkt)) == 1);
log_assert(LDNS_ANCOUNT(ldns_buffer_begin(pkt)) == 0);
log_assert(LDNS_NSCOUNT(ldns_buffer_begin(pkt)) == 0);
/* check edns section is present */
if(LDNS_ARCOUNT(ldns_buffer_begin(pkt)) > 1) {
return LDNS_RCODE_FORMERR;
}
if(LDNS_ARCOUNT(ldns_buffer_begin(pkt)) == 0) {
memset(edns, 0, sizeof(*edns));
edns->udp_size = 512;
return 0;
}
/* domain name must be the root of length 1. */
if(pkt_dname_len(pkt) != 1)
return LDNS_RCODE_FORMERR;
if(ldns_buffer_remaining(pkt) < 10) /* type, class, ttl, rdatalen */
return LDNS_RCODE_FORMERR;
if(ldns_buffer_read_u16(pkt) != LDNS_RR_TYPE_OPT)
return LDNS_RCODE_FORMERR;
edns->edns_present = 1;
edns->udp_size = ldns_buffer_read_u16(pkt); /* class is udp size */
edns->ext_rcode = ldns_buffer_read_u8(pkt); /* ttl used for bits */
edns->edns_version = ldns_buffer_read_u8(pkt);
edns->bits = ldns_buffer_read_u16(pkt);
/* ignore rdata and rrsigs */
return 0;
}