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preparing to write dns packet parser

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This commit is contained in:
hyung-hwan 2019-04-11 08:23:01 +00:00
parent a0f9b567cb
commit 564af6fbaf
2 changed files with 66 additions and 5 deletions
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61
mio/lib/dns.c
View File

@ -331,6 +331,65 @@ static mio_dns_msg_t* build_dns_msg (mio_dnsc_t* dnsc, mio_dns_bdns_t* bdns, mio
return msg;
}
static void parse_dns_pkt (mio_dnsc_t* dnsc, mio_dns_pkt_t* pkt, mio_oow_t len)
{
mio_t* mio = dnsc->mio;
mio_dns_bdns_t* bdns;
mio_uint16_t i;
mio_uint8_t* dn;
MIO_ASSERT (mio, len >= MIO_SIZEOF(*pkt));
/* TODO: */
bdns->id = mio_ntoh16(pkt->id);
bdns->qr = pkt->qr & 0x01;
bdns->opcode = pkt->opcode & 0x0F;
bdns->aa = pkt->aa & 0x01;
bdns->tc = pkt->tc & 0x01;
bdns->rd = pkt->rd & 0x01;
bdns->ra = pkt->ra & 0x01;
bdns->ad = pkt->ad & 0x01;
bdns->cd = pkt->cd & 0x01;
bdns->rcode = pkt->rcode & 0x0F;
/*
bdns->qdcount = mio_ntoh16(pkt->qdcount);
bdns->ancount = mio_ntoh16(pkt->ancount);
bdns->nscount = mio_ntoh16(pkt->nscount);
bdns->arcount = mio_ntoh16(pkt->arcount);
*/
dn = (mio_uint8_t*)(pkt + 1);
#if 0
for (i = 0; i < bdns->qrcount; i++)
{
}
for (i = 0; i < bdns->ancount; i++)
{
}
for (i = 0; i < bdns->nscount; i++)
{
}
for (i = 0; i < bdns->arcount; i++)
{
#if 0
if (*dn == 0)
{
rrtr = (mio_dns_rrtr_t*)(dn + 1);
if (rrtr->qtype == MIO_CONST_HTON16(MIO_DNS_QTYPE_OPT)
{
/* edns */
}
}
#endif
}
#endif
}
/* ----------------------------------------------------------------------- */
static int dnsc_on_read (mio_dev_sck_t* dev, const void* data, mio_iolen_t dlen, const mio_sckaddr_t* srcaddr)
@ -366,6 +425,8 @@ static int dnsc_on_read (mio_dev_sck_t* dev, const void* data, mio_iolen_t dlen,
{
MIO_DEBUG1 (mio, "received dns response...id %d\n", id);
/* TODO: parse the response... perform actual work. pass the result back?? */
parse_dns_pkt (dnsc, pkt, dlen);
release_dns_msg (dnsc, reqmsg);
return 0;
}

2
mio/lib/mio-dns.h
View File

@ -125,7 +125,7 @@ struct mio_dns_msg_t
};
#include <mio-pac1.h>
struct mio_dns_pkt_t
struct mio_dns_pkt_t /* dns packet header */
{
mio_uint16_t id;
#if defined(MIO_ENDIAN_BIG)