void
u_new (void)
{
int i = 0, j = 0, len = 0;
struct udpclient *x = NULL;
static char *q = 0;
char qtype[2], qclass[2];
for (j = 0; j < MAXUDP; j++)
if (!u[j].active)
break;
if (j >= MAXUDP)
{
j = 0;
for (i = 1; i < MAXUDP; i++)
if (taia_less (&u[i].start, &u[j].start))
j = i;
errno = error_timeout;
u_drop (j);
}
x = u + j;
taia_now (&x->start);
len = socket_recv4 (udp53, buf, sizeof (buf), x->ip, &x->port, &odst);
if (len == -1)
return;
if ((unsigned)len >= sizeof buf)
return;
if (x->port < 1024 && x->port != 53)
return;
if (!okclient (x->ip))
return;
if (!packetquery (buf, len, &q, qtype, qclass, x->id))
return;
x->active = ++numqueries;
++uactive;
if (debug_level)
log_query (x->active, x->ip, x->port, x->id, q, qtype);
switch (query_start (&x->q, q, qtype, qclass, myipoutgoing))
{
case -1:
u_drop (j);
return;
case 1:
u_respond (j);
}
}
void u_new(void)
{
int j;
int i;
struct udpclient *x;
int len;
static char *q = 0;
char qtype[2];
char qclass[2];
for (j = 0;j < MAXUDP;++j)
if (!u[j].active)
break;
if (j >= MAXUDP) {
j = 0;
for (i = 1;i < MAXUDP;++i)
if (taia_less(&u[i].start,&u[j].start))
j = i;
errno = error_timeout;
u_drop(j);
}
x = u + j;
taia_now(&x->start);
len = socket_recv6(udp53,buf,sizeof buf,x->ip,&x->port,&x->scope_id);
if (len == -1) return;
if (len >= sizeof buf) return;
if (x->port < 1024) if (x->port != 53) return;
if (!okclient(x->ip)) return;
if (!packetquery(buf,len,&q,qtype,qclass,x->id)) return;
x->active = ++numqueries; ++uactive;
log_query(&x->active,x->ip,x->port,x->id,q,qtype);
switch(query_start(&x->q,q,qtype,qclass,myipoutgoing,interface)) {
case -1:
u_drop(j);
return;
case 1:
u_respond(j);
}
}
static void
doit (void)
{
struct taia stamp;
struct taia deadline;
int j = 0, r = 0, iolen = 0;
for (;;)
{
taia_now (&stamp);
taia_uint (&deadline, 120);
taia_add (&deadline, &deadline, &stamp);
iolen = 0;
udp53io = io + iolen++;
udp53io->fd = udp53;
udp53io->events = IOPAUSE_READ;
tcp53io = io + iolen++;
tcp53io->fd = tcp53;
tcp53io->events = IOPAUSE_READ;
for (j = 0; j < MAXUDP; ++j)
{
if (u[j].active)
{
u[j].io = io + iolen++;
query_io (&u[j].q, u[j].io, &deadline);
}
}
for (j = 0; j < MAXTCP; ++j)
{
if (t[j].active)
{
t[j].io = io + iolen++;
if (t[j].state == 0)
query_io (&t[j].q, t[j].io, &deadline);
else
{
if (taia_less (&t[j].timeout, &deadline))
deadline = t[j].timeout;
t[j].io->fd = t[j].tcp;
t[j].io->events = (t[j].state > 0) ?
IOPAUSE_READ : IOPAUSE_WRITE;
}
}
}
iopause (io, iolen, &deadline, &stamp);
for (j = 0; j < MAXUDP; ++j)
{
if (u[j].active)
{
r = query_get (&u[j].q, u[j].io, &stamp);
if (r == -1)
u_drop (j);
if (r == 1)
u_respond (j);
}
}
for (j = 0; j < MAXTCP; ++j)
{
if (t[j].active)
{
if (t[j].io->revents)
t_timeout (j);
if (t[j].state == 0)
{
r = query_get (&t[j].q, t[j].io, &stamp);
if (r == -1)
t_drop (j);
if (r == 1)
t_respond (j);
}
else
if (t[j].io->revents || taia_less (&t[j].timeout, &stamp))
t_rw (j);
}
}
if (udp53io && udp53io->revents)
u_new();
if (tcp53io && tcp53io->revents)
t_new();
}
}
