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created the dns_msg_to_pkt() macro

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schedued to wait for response only if a query has been sent
This commit is contained in:
hyung-hwan 2019-04-12 07:02:04 +00:00
parent 8f6888a47d
commit 423b627cbc
1 changed files with 40 additions and 30 deletions
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70
mio/lib/dns.c
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@ -127,13 +127,17 @@ static mio_oow_t dn_length (mio_uint8_t* ptr, mio_oow_t len)
}
/* ----------------------------------------------------------------------- */
#if defined(MIO_HAVE_INLINE)
# static MIO_INLINE mio_dns_pkt_t* dns_msg_to_pkt (mio_dns_msg_t* msg) { return (mio_dns_pkt_t*)(msg + 1); }
#else
# define dns_msg_to_pkt(msg) ((mio_dns_pkt_t*)((mio_dns_msg_t*)(msg) + 1))
#endif
static void release_dns_msg (mio_dnsc_t* dnsc, mio_dns_msg_t* msg)
{
mio_t* mio = dnsc->mio;
MIO_DEBUG1 (mio, "releasing dns msg %d\n", (int)mio_ntoh16(((mio_dns_pkt_t*)(msg + 1))->id));
MIO_DEBUG1 (mio, "releasing dns msg %d\n", (int)mio_ntoh16(dns_msg_to_pkt(msg)->id));
if (msg == dnsc->pending_req || msg->next || msg->prev)
{
@ -221,7 +225,7 @@ static mio_dns_msg_t* build_dns_msg (mio_dnsc_t* dnsc, mio_dns_bdns_t* bdns, mio
msg->rtmridx = MIO_TMRIDX_INVALID;
msg->dev = (mio_dev_t*)dnsc->sck;
pkt = (mio_dns_pkt_t*)(msg + 1); /* actual message begins after the size word */
pkt = dns_msg_to_pkt(msg); /* actual message begins after the size word */
dn = (mio_uint8_t*)(pkt + 1);
for (i = 0; i < qr_count; i++)
@ -420,7 +424,7 @@ static int dnsc_on_read (mio_dev_sck_t* dev, const void* data, mio_iolen_t dlen,
reqmsg = dnsc->pending_req;
while (reqmsg)
{
mio_dns_pkt_t* reqpkt = (mio_dns_pkt_t*)(reqmsg + 1);
mio_dns_pkt_t* reqpkt = dns_msg_to_pkt(reqmsg);
if (dev == (mio_dev_sck_t*)reqmsg->dev && pkt->id == reqpkt->id) /* TODO: check the source address against the target address */
{
MIO_DEBUG1 (mio, "received dns response...id %d\n", id);
@ -456,38 +460,44 @@ static int dnsc_on_write (mio_dev_sck_t* dev, mio_iolen_t wrlen, void* wrctx, co
mio_t* mio = dev->mio;
mio_dns_msg_t* msg = (mio_dns_msg_t*)wrctx;
mio_dnsc_t* dnsc = ((dnsc_sck_xtn_t*)mio_dev_sck_getxtn(dev))->dnsc;
mio_tmrjob_t tmrjob;
mio_ntime_t tmout;
MIO_DEBUG0 (mio, "sent dns request...\n");
MIO_DEBUG1 (mio, "sent dns message %d\n", (int)mio_ntoh16(dns_msg_to_pkt(msg)->id));
MIO_ASSERT (mio, dev == (mio_dev_sck_t*)msg->dev);
/* TODO: make this configurable. or accept dnsc->config.read_timeout... */
tmout.sec = 3;
tmout.nsec = 0;
MIO_MEMSET (&tmrjob, 0, MIO_SIZEOF(tmrjob));
tmrjob.ctx = msg;
mio_gettime (mio, &tmrjob.when);
MIO_ADD_NTIME (&tmrjob.when, &tmrjob.when, &tmout);
tmrjob.handler = dnsc_on_read_timeout;
tmrjob.idxptr = &msg->rtmridx;
msg->rtmridx = mio_instmrjob(mio, &tmrjob);
if (msg->rtmridx == MIO_TMRIDX_INVALID)
if (dns_msg_to_pkt(msg)->qr == 0)
{
MIO_DEBUG0 (mio, "unable to schedule timeout...\n");
release_dns_msg (dnsc, msg);
return 0;
}
/* question. schedule to wait for response */
mio_tmrjob_t tmrjob;
mio_ntime_t tmout;
/* TODO: improve performance */
if (dnsc->pending_req)
{
dnsc->pending_req->prev = msg;
msg->next = dnsc->pending_req;
/* TODO: make this configurable. or accept dnsc->config.read_timeout... */
tmout.sec = 3;
tmout.nsec = 0;
MIO_MEMSET (&tmrjob, 0, MIO_SIZEOF(tmrjob));
tmrjob.ctx = msg;
mio_gettime (mio, &tmrjob.when);
MIO_ADD_NTIME (&tmrjob.when, &tmrjob.when, &tmout);
tmrjob.handler = dnsc_on_read_timeout;
tmrjob.idxptr = &msg->rtmridx;
msg->rtmridx = mio_instmrjob(mio, &tmrjob);
if (msg->rtmridx == MIO_TMRIDX_INVALID)
{
MIO_DEBUG0 (mio, "unable to schedule timeout...\n");
release_dns_msg (dnsc, msg);
return 0;
}
/* TODO: improve performance. hashing by id? */
if (dnsc->pending_req)
{
dnsc->pending_req->prev = msg;
msg->next = dnsc->pending_req;
}
dnsc->pending_req = msg;
}
dnsc->pending_req = msg;
return 0;
}
@ -562,7 +572,7 @@ int mio_dnsc_sendmsg (mio_dnsc_t* dnsc, mio_dns_bdns_t* bdns, mio_dns_bqr_t* qr,
if (!msg) return -1;
/* TODO: optionally, override dnsc->serveraddr and use the target address passed as a parameter */
if (mio_dev_sck_write(dnsc->sck, msg + 1, msg->pktlen, msg, &dnsc->serveraddr) <= -1)
if (mio_dev_sck_write(dnsc->sck, dns_msg_to_pkt(msg), msg->pktlen, msg, &dnsc->serveraddr) <= -1)
{
release_dns_msg (dnsc, msg);
return -1;