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enhanced rr data parsing

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This commit is contained in:
hyung-hwan 2020-02-17 14:54:21 +00:00
parent 616384b042
commit ee0fe1b408
3 changed files with 86 additions and 37 deletions
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15
mio/bin/t01.c
View File

@ -694,9 +694,18 @@ static void on_dnc_resolve_brief (mio_svc_dnc_t* dnc, mio_dns_msg_t* reqmsg, mio
{ {
printf ("^^^ SIMPLE -> CNAME [%s] %d\n", brr->dptr, (int)brr->dlen); printf ("^^^ SIMPLE -> CNAME [%s] %d\n", brr->dptr, (int)brr->dlen);
} }
else if (brr->rrtype == MIO_DNS_RRT_NS)
{
printf ("^^^ SIMPLE -> NS [%s] %d\n", brr->dptr, (int)brr->dlen);
}
else if (brr->rrtype == MIO_DNS_RRT_SOA)
{
mio_dns_brrd_soa_t* soa = brr->dptr;
printf ("^^^ SIMPLE -> SOA [%s] [%s] [%u %u %u %u %u] %d\n", soa->mname, soa->rname, (unsigned)soa->serial, (unsigned)soa->refresh, (unsigned)soa->retry, (unsigned)soa->expire, (unsigned)soa->minimum, (int)brr->dlen);
}
else else
{ {
printf ("^^^ SIMPLE -> UNEXPECTED DATA...\n"); printf ("^^^ SIMPLE -> UNKNOWN DATA... [%.*s] %d\n", (int)brr->dlen, brr->dptr, (int)brr->dlen);
} }
} }
else else
@ -1005,7 +1014,9 @@ if (!mio_svc_dnc_resolve(dnc, "code.miflux.com", MIO_DNS_RRT_A, MIO_SVC_DNC_RESO
printf ("resolve attempt failure ---> code.miflux.com\n"); printf ("resolve attempt failure ---> code.miflux.com\n");
} }
if (!mio_svc_dnc_resolve(dnc, "ipv6.google.com", MIO_DNS_RRT_AAAA, MIO_SVC_DNC_RESOLVE_FLAG_BRIEF, on_dnc_resolve_brief, 0)) //if (!mio_svc_dnc_resolve(dnc, "ipv6.google.com", MIO_DNS_RRT_AAAA, MIO_SVC_DNC_RESOLVE_FLAG_BRIEF, on_dnc_resolve_brief, 0))
if (!mio_svc_dnc_resolve(dnc, "google.com", MIO_DNS_RRT_SOA, MIO_SVC_DNC_RESOLVE_FLAG_BRIEF, on_dnc_resolve_brief, 0))
//if (!mio_svc_dnc_resolve(dnc, "google.com", MIO_DNS_RRT_NS, MIO_SVC_DNC_RESOLVE_FLAG_BRIEF, on_dnc_resolve_brief, 0))
{ {
printf ("resolve attempt failure ---> code.miflux.com\n"); printf ("resolve attempt failure ---> code.miflux.com\n");
} }

94
mio/lib/dns.c
View File

@ -741,7 +741,7 @@ static int parse_answer_rr (mio_t* mio, mio_dns_rr_part_t rr_part, mio_oow_t pos
mio_dns_rrtr_t* rrtr; mio_dns_rrtr_t* rrtr;
mio_uint16_t qtype, dlen; mio_uint16_t qtype, dlen;
mio_oow_t remsize; mio_oow_t remsize;
mio_uint8_t* xrrdptr; mio_uint8_t* xrrdptr, *xrrdptr2;
xrrdptr = pi->_rrdptr; xrrdptr = pi->_rrdptr;
if (parse_domain_name(mio, pi) <= -1) return -1; if (parse_domain_name(mio, pi) <= -1) return -1;
@ -757,26 +757,7 @@ static int parse_answer_rr (mio_t* mio, mio_dns_rr_part_t rr_part, mio_oow_t pos
remsize = pi->_end - pi->_ptr; remsize = pi->_end - pi->_ptr;
if (MIO_UNLIKELY(remsize < dlen)) goto oops; if (MIO_UNLIKELY(remsize < dlen)) goto oops;
if (pi->_rrdptr) xrrdptr2 = pi->_rrdptr;
{
/* store information about the actual record */
mio_dns_brr_t* brr;
switch (rr_part)
{
case MIO_DNS_RR_PART_ANSWER: brr = pi->rr.an; break;
case MIO_DNS_RR_PART_AUTHORITY: brr = pi->rr.ns; break;
case MIO_DNS_RR_PART_ADDITIONAL: brr = pi->rr.ar; break;
}
brr[pos].part = rr_part;
brr[pos].rrname = (mio_bch_t*)xrrdptr;
brr[pos].rrtype = mio_ntoh16(rrtr->rrtype);
brr[pos].rrclass = mio_ntoh16(rrtr->rrclass);
brr[pos].ttl = mio_ntoh32(rrtr->ttl);
brr[pos].dptr = pi->_rrdptr;
brr[pos].dlen = dlen;
}
switch (qtype) switch (qtype)
{ {
@ -806,31 +787,67 @@ static int parse_answer_rr (mio_t* mio, mio_dns_rr_part_t rr_part, mio_oow_t pos
pi->edns.version = (rrtr->ttl >> 16) & 0xFF; pi->edns.version = (rrtr->ttl >> 16) & 0xFF;
pi->edns.dnssecok = ((rrtr->ttl & 0x8000) >> 15); pi->edns.dnssecok = ((rrtr->ttl & 0x8000) >> 15);
/*if ((rrtr->ttl & 0x7FFF) != 0) goto oops;*/ /* Z not 0 - ignore this for now */ /*if ((rrtr->ttl & 0x7FFF) != 0) goto oops;*/ /* Z not 0 - ignore this for now */
break; goto verbatim;
} }
case MIO_DNS_RRT_A: case MIO_DNS_RRT_A:
if (MIO_UNLIKELY(dlen != 4)) goto oops; if (MIO_UNLIKELY(dlen != 4)) goto oops;
break; goto verbatim;
case MIO_DNS_RRT_AAAA: case MIO_DNS_RRT_AAAA:
if (MIO_UNLIKELY(dlen != 16)) goto oops; if (MIO_UNLIKELY(dlen != 16)) goto oops;
break; goto verbatim;
case MIO_DNS_RRT_CNAME: case MIO_DNS_RRT_CNAME:
case MIO_DNS_RRT_NS:
{ {
#if !defined(MIO_BUILD_RELEASE) #if !defined(MIO_BUILD_RELEASE)
mio_uint8_t* xptr = pi->_ptr; mio_uint8_t* xptr = pi->_ptr;
#endif #endif
if (parse_domain_name(mio, pi) <= -1) return -1; if (parse_domain_name(mio, pi) <= -1) return -1;
MIO_ASSERT (mio, pi->_ptr == xptr + dlen); MIO_ASSERT (mio, pi->_ptr == xptr + dlen);
dlen = 0; /* to skip additional update on pi->_ptr and data copy before return */
break; break;
} }
case MIO_DNS_RRT_SOA:
{
#if !defined(MIO_BUILD_RELEASE)
mio_uint8_t* xptr = pi->_ptr;
#endif
mio_dns_brrd_soa_t* soa;
pi->_rrdlen += MIO_SIZEOF(*soa);
if (pi->_rrdptr)
{
soa = (mio_dns_brrd_soa_t*)pi->_rrdptr;
pi->_rrdptr += MIO_SIZEOF(*soa);
soa->mname = (mio_bch_t*)pi->_rrdptr;
if (parse_domain_name(mio, pi) <= -1) return -1;
soa->rname = (mio_bch_t*)pi->_rrdptr;
if (parse_domain_name(mio, pi) <= -1) return -1;
MIO_MEMCPY (&soa->serial, pi->_ptr, 20);
soa->serial = mio_ntoh32(soa->serial);
soa->refresh = mio_ntoh32(soa->refresh);
soa->retry = mio_ntoh32(soa->retry);
soa->expire = mio_ntoh32(soa->expire);
soa->minimum = mio_ntoh32(soa->minimum);
}
else
{
if (parse_domain_name(mio, pi) <= -1) return -1;
if (parse_domain_name(mio, pi) <= -1) return -1;
}
pi->_ptr += 20;
MIO_ASSERT (mio, pi->_ptr == xptr + dlen);
break;
} }
if (dlen > 0) default:
{ verbatim:
pi->_ptr += dlen; pi->_ptr += dlen;
pi->_rrdlen += dlen; pi->_rrdlen += dlen;
if (pi->_rrdptr) if (pi->_rrdptr)
@ -840,6 +857,29 @@ static int parse_answer_rr (mio_t* mio, mio_dns_rr_part_t rr_part, mio_oow_t pos
} }
} }
if (pi->_rrdptr)
{
/* store information about the actual record */
mio_dns_brr_t* brr;
switch (rr_part)
{
case MIO_DNS_RR_PART_ANSWER: brr = pi->rr.an; break;
case MIO_DNS_RR_PART_AUTHORITY: brr = pi->rr.ns; break;
case MIO_DNS_RR_PART_ADDITIONAL: brr = pi->rr.ar; break;
}
brr[pos].part = rr_part;
brr[pos].rrname = (mio_bch_t*)xrrdptr;
brr[pos].rrtype = mio_ntoh16(rrtr->rrtype);
brr[pos].rrclass = mio_ntoh16(rrtr->rrclass);
brr[pos].ttl = mio_ntoh32(rrtr->ttl);
brr[pos].dptr = xrrdptr2;
/* this length may be different from the length in the header as transformation is performed on some RR data.
* for a domain name, it's inclusive of the termining null. */
brr[pos].dlen = pi->_rrdptr - xrrdptr2;
}
return 0; return 0;
oops: oops:

6
mio/lib/mio-dns.h
View File

@ -324,21 +324,19 @@ struct mio_dns_brrd_mx_t
mio_bch_t* exchange; mio_bch_t* exchange;
}; };
typedef struct mio_dns_brrd_mx_t mio_dns_brrd_mx_t; typedef struct mio_dns_brrd_mx_t mio_dns_brrd_mx_t;
#endif
struct mio_dns_brrd_soa_t struct mio_dns_brrd_soa_t
{ {
mio_bch_t* mname; mio_bch_t* mname;
mio_bch_t* rname; mio_bch_t* rname;
mio_uint32_t serial mio_uint32_t serial;
mio_uint32_t refresh; mio_uint32_t refresh;
mio_uint32_t retry; mio_uint32_t retry;
mio_uint32_t expire; mio_uint32_t expire;
mio_uint32_t minimum; mio_uint32_t minimum;
}; };
typedef struct mio_dns_brrd_soa_t mio_dns_brrd_soa_t; typedef struct mio_dns_brrd_soa_t mio_dns_brrd_soa_t;
#endif
struct mio_dns_beopt_t struct mio_dns_beopt_t
{ {