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/* ISC license. */
#include <errno.h>
#include <skalibs/error.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <skalibs/ip46.h>
#include <s6-dns/s6dns-constants.h>
#include <s6-dns/s6dns-domain.h>
#include <s6-dns/s6dns-message.h>
#include <s6-dns/s6dns-engine.h>
#include <s6-dns/s6dns-resolve.h>
static int addit (genalloc *ips, char const *s, size_t len, int is6)
{
size_t base = genalloc_len(ip46full_t, ips) ;
size_t n = len >> (is6 ? 4 : 2) ;
ip46full_t *p ;
if (!genalloc_readyplus(ip46full_t, ips, n)) return 0 ;
p = genalloc_s(ip46full_t, ips) + base ;
for (size_t i = 0 ; i < n ; i++)
if (is6) ip46full_from_ip6(p + i, s + (i << 4)) ;
else ip46full_from_ip4(p + i, s + (i << 2)) ;
genalloc_setlen(ip46full_t, ips, base + n) ;
return 1 ;
}
int s6dns_resolveq_aaaaa_r (genalloc *ips, char const *name, size_t len, s6dns_rci_t const *rci, s6dns_debughook_t const *dbh, tain_t const *deadline, tain_t *stamp)
{
s6dns_engine_t dtl[rci->rulesnum << 1] ;
stralloc data = STRALLOC_ZERO ;
unsigned int best = 0 ;
unsigned int n ;
int e = 0 ;
int ans = 0 ;
int pinned = 0 ;
unsigned int i = 0 ;
{
s6dns_domain_t domains[rci->rulesnum] ;
n = s6dns_domain_fromstring_qualify_encode(domains, name, len, rci->rules.s, rci->rulesnum) ;
if (!n) return -1 ;
for (; i < n ; i++)
{
dtl[i<<1] = s6dns_engine_zero ;
if (!s6dns_engine_init_r(dtl + (i<<1), &rci->servers, S6DNS_O_RECURSIVE, domains[i].s, domains[i].len, S6DNS_T_AAAA, dbh, deadline, stamp))
{
s6dns_engine_freen(dtl, i<<1) ;
return -1 ;
}
dtl[(i<<1)+1] = s6dns_engine_zero ;
if (!s6dns_engine_init_r(dtl + (i<<1) + 1, &rci->servers, S6DNS_O_RECURSIVE, domains[i].s, domains[i].len, S6DNS_T_A, dbh, deadline, stamp))
{
s6dns_engine_freen(dtl, (i<<1)+1) ;
return -1 ;
}
}
}
for (;;)
{
int k = s6dns_resolven_loop(dtl, n << 1, 1, deadline, stamp) ;
if (k < 0) goto err ;
if ((unsigned int)k == best)
{
for (;; best++)
{
s6dns_message_header_t h ;
int r ;
if (pinned && !(best & 1)) goto end ;
if (best >= n << 1) goto notfound ;
if (error_isagain(dtl[best].status)) break ;
errno = dtl[best].status ;
if (errno) goto err ;
r = s6dns_message_parse(&h, s6dns_engine_packet(dtl + best), s6dns_engine_packetlen(dtl + best), (best & 1) ? &s6dns_message_parse_answer_a : s6dns_message_parse_answer_aaaa, &data) ;
if (r < 0) goto err ;
else if (r)
{
if (!addit(ips, data.s, data.len, !(best & 1))) goto err ;
if (r > 1) ans |= 1 + !(best & 1) ;
data.len = 0 ;
pinned = 1 ;
}
else
{
switch (errno)
{
case EBUSY :
case ENOENT :
case ECONNREFUSED :
case EIO :
break ;
default : goto err ;
}
if (!best) e = errno ;
}
}
}
}
notfound:
errno = e ;
ans = 0 ;
goto end ;
err:
ans = -1 ;
end:
stralloc_free(&data) ;
s6dns_engine_freen(dtl, n<<1) ;
return ans ;
}
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