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/* ISC license. */
#include <skalibs/cdb.h>
#include <shibari/constants.h>
#include <shibari/tdb.h>
#include <shibari/packet.h>
static unsigned int childzone (shibari_packet *pkt, cdb const *tdb, s6dns_domain_t const *q, char const *loc, tain const *stamp, uint16_t nplen, uint16_t zplen)
{
cdb_find_state state = CDB_FIND_STATE_ZERO ;
unsigned int gr ;
for (;;)
{
shibari_tdb_entry ns ;
int r = shibari_tdb_read_entry(tdb, &state, &ns, q->s + nplen, q->len - nplen, SHIBARI_T_NS, 0, loc, stamp, 0) ;
if (r == -1) return 2 ;
if (!r) break ;
r = shibari_packet_add_rr(pkt, &ns, nplen, 0, 3) ;
if (!r) { pkt->hdr.tc = 1 ; goto end ; }
}
gr = shibari_packet_add_glue(pkt, tdb, q->s + nplen, q->len - nplen, SHIBARI_T_NS, q->s + zplen, q->len - zplen, zplen, 0, loc, stamp) ;
if (gr > 0) return gr ;
end:
shibari_packet_end(pkt) ;
return 0 ;
}
unsigned int shibari_packet_tdb_answer_query (shibari_packet *pkt, cdb const *tdb, s6dns_message_header_t const *qhdr, s6dns_domain_t const *q, uint16_t qtype, char const *loc, tain const *stamp)
{
unsigned int rcode = 0 ;
cdb_find_state state = CDB_FIND_STATE_ZERO ;
uint32_t flagyxdomain = 0 ;
int nplen, zplen ;
uint16_t gluetype = 0 ;
uint16_t wildpos = 0 ;
shibari_packet_begin(pkt, qhdr->id, q, qtype) ;
pkt->hdr.rd = qhdr->rd ;
zplen = shibari_tdb_find_authority(tdb, q->s, q->len, loc, stamp, &nplen) ;
switch (zplen)
{
case -2 : return 9 ;
case -1 : return 2 ;
default : break ;
}
if (nplen >= 0 && nplen < zplen)
return childzone(pkt, tdb, q, loc, stamp, nplen, zplen) ;
pkt->hdr.aa = 1 ; /* we're in the zone, man */
while (wildpos <= zplen)
{
for (;;)
{
shibari_tdb_entry entry ;
int r = shibari_tdb_read_entry(tdb, &state, &entry, q->s + wildpos, q->len + wildpos, qtype, !!wildpos, loc, stamp, &flagyxdomain) ;
if (r == -1) return 2 ;
if (!r) break ;
if (!shibari_packet_add_rr(pkt, &entry, 0, 0, 2))
{
pkt->hdr.tc = 1 ;
return 0 ;
}
switch (entry.type)
{
case SHIBARI_T_SOA : goto got ; /* wtf tinydns-data putting several SOA */
case SHIBARI_T_NS :
case SHIBARI_T_MX :
case SHIBARI_T_CNAME : /* we're not supposed to but meh */
gluetype = entry.type ;
default : break ;
}
}
if (pkt->hdr.counts.an) break ;
wildpos += 1 + q->s[wildpos] ;
}
got:
if (!flagyxdomain) pkt->hdr.rcode = 3 ;
if (!pkt->hdr.counts.an)
{
unsigned int r = shibari_packet_assert_authority(pkt, tdb, q->s + zplen, q->len - zplen, zplen, loc, stamp) ;
if (r) return r ;
}
else if (gluetype)
{
unsigned int r = shibari_packet_add_glue(pkt, tdb, q->s, q->len, gluetype, q->s + zplen, q->len - zplen, zplen, wildpos, loc, stamp) ;
if (r) return r ;
}
shibari_packet_end(pkt) ;
return rcode ;
}
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