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added MIO_SVC_DNC_RESOLVE_FLAG_PREFER_TCP.

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added an additional parameter 'prefer_tcp' to mio_svc_dnc_sendreq() and mio_svc_dnc_sendmsg()
This commit is contained in:
hyung-hwan 2020-03-01 17:43:42 +00:00
parent 247184282f
commit aeba287690
3 changed files with 92 additions and 50 deletions
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11
mio/bin/t01.c
View File

@ -1027,13 +1027,13 @@ for (i = 0; i < 5; i++)
MIO_DNS_RCODE_BADCOOKIE /* rcode */ MIO_DNS_RCODE_BADCOOKIE /* rcode */
}; };
mio_svc_dnc_sendreq (dnc, &qhdr, &qrs[0], &qedns, MIO_NULL, 0); mio_svc_dnc_sendreq (dnc, &qhdr, &qrs[0], &qedns, 0, MIO_NULL, 0);
mio_svc_dnc_sendmsg (dnc, &rhdr, qrs, MIO_COUNTOF(qrs), rrs, MIO_COUNTOF(rrs), &qedns, MIO_NULL, 0); mio_svc_dnc_sendmsg (dnc, &rhdr, qrs, MIO_COUNTOF(qrs), rrs, MIO_COUNTOF(rrs), &qedns, 0, MIO_NULL, 0);
} }
#endif #endif
if (!mio_svc_dnc_resolve(dnc, "b.wild.com", MIO_DNS_RRT_A, 0, on_dnc_resolve, 0)) if (!mio_svc_dnc_resolve(dnc, "b.wild.com", MIO_DNS_RRT_A, MIO_SVC_DNC_RESOLVE_FLAG_PREFER_TCP, on_dnc_resolve, 0))
{ {
printf ("resolve attempt failure ---> a.wild.com\n"); printf ("resolve attempt failure ---> a.wild.com\n");
} }
@ -1043,13 +1043,14 @@ if (!mio_svc_dnc_resolve(dnc, "www.microsoft.com", MIO_DNS_RRT_CNAME, 0, on_dnc_
printf ("resolve attempt failure ---> www.microsoft.com\n"); printf ("resolve attempt failure ---> www.microsoft.com\n");
} }
#if 0
//if (!mio_svc_dnc_resolve(dnc, "www.microsoft.com", MIO_DNS_RRT_A, MIO_SVC_DNC_RESOLVE_FLAG_BRIEF, on_dnc_resolve_brief, 0)) //if (!mio_svc_dnc_resolve(dnc, "www.microsoft.com", MIO_DNS_RRT_A, MIO_SVC_DNC_RESOLVE_FLAG_BRIEF, on_dnc_resolve_brief, 0))
if (!mio_svc_dnc_resolve(dnc, "code.miflux.com", MIO_DNS_RRT_A, MIO_SVC_DNC_RESOLVE_FLAG_BRIEF, on_dnc_resolve_brief, 0)) if (!mio_svc_dnc_resolve(dnc, "code.miflux.com", MIO_DNS_RRT_A, MIO_SVC_DNC_RESOLVE_FLAG_BRIEF | MIO_SVC_DNC_RESOLVE_FLAG_PREFER_TCP, on_dnc_resolve_brief, 0))
{ {
printf ("resolve attempt failure ---> code.miflux.com\n"); printf ("resolve attempt failure ---> code.miflux.com\n");
} }
#if 0
if (!mio_svc_dnc_resolve(dnc, "1.1.1.1.in-addr.arpa", MIO_DNS_RRT_PTR, MIO_SVC_DNC_RESOLVE_FLAG_BRIEF, on_dnc_resolve_brief, 0)) if (!mio_svc_dnc_resolve(dnc, "1.1.1.1.in-addr.arpa", MIO_DNS_RRT_PTR, MIO_SVC_DNC_RESOLVE_FLAG_BRIEF, on_dnc_resolve_brief, 0))
{ {
printf ("resolve attempt failure ---> 1.1.1.1.in-addr.arpa\n"); printf ("resolve attempt failure ---> 1.1.1.1.in-addr.arpa\n");

124
mio/lib/dns-cli.c
View File

@ -80,6 +80,7 @@ struct dnc_dns_msg_xtn_t
mio_ntime_t rtmout; mio_ntime_t rtmout;
int rmaxtries; /* maximum number of tries to receive a reply */ int rmaxtries; /* maximum number of tries to receive a reply */
int rtries; /* number of tries made so far */ int rtries; /* number of tries made so far */
int pending;
}; };
typedef struct dnc_dns_msg_xtn_t dnc_dns_msg_xtn_t; typedef struct dnc_dns_msg_xtn_t dnc_dns_msg_xtn_t;
@ -97,6 +98,7 @@ static MIO_INLINE void chain_pending_dns_reqmsg (mio_svc_dnc_t* dnc, mio_dns_msg
dnc_dns_msg_getxtn(msg)->next = dnc->pending_req; dnc_dns_msg_getxtn(msg)->next = dnc->pending_req;
} }
dnc->pending_req = msg; dnc->pending_req = msg;
dnc_dns_msg_getxtn(msg)->pending = 1;
} }
static MIO_INLINE void unchain_pending_dns_reqmsg (mio_svc_dnc_t* dnc, mio_dns_msg_t* msg) static MIO_INLINE void unchain_pending_dns_reqmsg (mio_svc_dnc_t* dnc, mio_dns_msg_t* msg)
@ -105,6 +107,35 @@ static MIO_INLINE void unchain_pending_dns_reqmsg (mio_svc_dnc_t* dnc, mio_dns_m
if (msgxtn->next) dnc_dns_msg_getxtn(msgxtn->next)->prev = msgxtn->prev; if (msgxtn->next) dnc_dns_msg_getxtn(msgxtn->next)->prev = msgxtn->prev;
if (msgxtn->prev) dnc_dns_msg_getxtn(msgxtn->prev)->next = msgxtn->next; if (msgxtn->prev) dnc_dns_msg_getxtn(msgxtn->prev)->next = msgxtn->next;
else dnc->pending_req = msgxtn->next; else dnc->pending_req = msgxtn->next;
dnc_dns_msg_getxtn(msg)->pending = 0;
}
static mio_dns_msg_t* make_dns_msg (mio_svc_dnc_t* dnc, mio_dns_bhdr_t* bdns, mio_dns_bqr_t* qr, mio_oow_t qr_count, mio_dns_brr_t* rr, mio_oow_t rr_count, mio_dns_bedns_t* edns, mio_svc_dnc_on_done_t on_done, mio_oow_t xtnsize)
{
mio_dns_msg_t* msg;
dnc_dns_msg_xtn_t* msgxtn;
msg = mio_dns_make_msg(dnc->mio, bdns, qr, qr_count, rr, rr_count, edns, MIO_SIZEOF(*msgxtn) + xtnsize);
if (!msg) return MIO_NULL;
if (bdns->id < 0)
{
mio_dns_pkt_t* pkt = mio_dns_msg_to_pkt(msg);
pkt->id = mio_hton16(dnc->seq);
dnc->seq++;
}
msgxtn = dnc_dns_msg_getxtn(msg);
msgxtn->dev = dnc->udp_sck;
msgxtn->rtmridx = MIO_TMRIDX_INVALID;
msgxtn->on_done = on_done;
msgxtn->wtmout = dnc->send_tmout;
msgxtn->rtmout = dnc->reply_tmout;
msgxtn->rmaxtries = dnc->reply_tmout_max_tries;
msgxtn->rtries = 0;
msgxtn->servaddr = dnc->serv_addr;
return msg;
} }
static void release_dns_msg (mio_svc_dnc_t* dnc, mio_dns_msg_t* msg) static void release_dns_msg (mio_svc_dnc_t* dnc, mio_dns_msg_t* msg)
@ -312,6 +343,8 @@ static int on_tcp_write (mio_dev_sck_t* dev, mio_iolen_t wrlen, void* wrctx, con
MIO_DEBUG0 (mio, "unable to schedule tcp timeout...\n"); MIO_DEBUG0 (mio, "unable to schedule tcp timeout...\n");
goto finalize; goto finalize;
} }
MIO_ASSERT (mio, msgxtn->pending == 1);
} }
else else
{ {
@ -328,10 +361,9 @@ finalize:
return 0; return 0;
} }
static void write_dns_msg_over_tcp (mio_dev_sck_t* dev, mio_dns_msg_t* msg) static int write_dns_msg_over_tcp (mio_dev_sck_t* dev, mio_dns_msg_t* msg)
{ {
mio_t* mio = dev->mio; mio_t* mio = dev->mio;
mio_svc_dnc_t* dnc = ((dnc_sck_xtn_t*)mio_dev_sck_getxtn(dev))->dnc;
dnc_dns_msg_xtn_t* msgxtn = dnc_dns_msg_getxtn(msg); dnc_dns_msg_xtn_t* msgxtn = dnc_dns_msg_getxtn(msg);
mio_uint16_t pktlen; mio_uint16_t pktlen;
mio_iovec_t iov[2]; mio_iovec_t iov[2];
@ -339,18 +371,14 @@ static void write_dns_msg_over_tcp (mio_dev_sck_t* dev, mio_dns_msg_t* msg)
pktlen = mio_hton16(msg->pktlen); pktlen = mio_hton16(msg->pktlen);
MIO_ASSERT (mio, msgxtn->rtries == 0); MIO_ASSERT (mio, msgxtn->rtries == 0);
msgxtn->rtries = 1; /* this is the first send. however, there will be no retries over tcp */ msgxtn->rtries = 1;
/* TODO: Is it better to create 2 byte space when sending UDP and use it here instead of iov? */ /* TODO: Is it better to create 2 byte space when sending UDP and use it here instead of iov? */
iov[0].iov_ptr = &pktlen; iov[0].iov_ptr = &pktlen;
iov[0].iov_len = MIO_SIZEOF(pktlen); iov[0].iov_len = MIO_SIZEOF(pktlen);
iov[1].iov_ptr = mio_dns_msg_to_pkt(msg); iov[1].iov_ptr = mio_dns_msg_to_pkt(msg);
iov[1].iov_len = msg->pktlen; iov[1].iov_len = msg->pktlen;
if (mio_dev_sck_timedwritev(dev, iov, MIO_COUNTOF(iov), &msgxtn->rtmout, msg, MIO_NULL) <= -1) return mio_dev_sck_timedwritev(dev, iov, MIO_COUNTOF(iov), &msgxtn->rtmout, msg, MIO_NULL);
{
if (MIO_LIKELY(msgxtn->on_done)) msgxtn->on_done (dnc, msg, mio_geterrnum(mio), MIO_NULL, 0);
release_dns_msg (dnc, msg);
}
} }
static void on_tcp_connect (mio_dev_sck_t* dev) static void on_tcp_connect (mio_dev_sck_t* dev)
@ -367,7 +395,14 @@ static void on_tcp_connect (mio_dev_sck_t* dev)
dnc_dns_msg_xtn_t* reqmsgxtn = dnc_dns_msg_getxtn(reqmsg); dnc_dns_msg_xtn_t* reqmsgxtn = dnc_dns_msg_getxtn(reqmsg);
mio_dns_msg_t* nextreqmsg = reqmsgxtn->next; mio_dns_msg_t* nextreqmsg = reqmsgxtn->next;
if (reqmsgxtn->dev == dev && reqmsgxtn->rtries <= 0) write_dns_msg_over_tcp (dev, reqmsg); if (reqmsgxtn->dev == dev && reqmsgxtn->rtries == 0)
{
if (write_dns_msg_over_tcp(dev, reqmsg) <= -1)
{
if (MIO_LIKELY(reqmsgxtn->on_done)) reqmsgxtn->on_done (dnc, reqmsg, mio_geterrnum(mio), MIO_NULL, 0);
release_dns_msg (dnc, reqmsg);
}
}
reqmsg = nextreqmsg; reqmsg = nextreqmsg;
} }
} }
@ -465,13 +500,18 @@ static int switch_reqmsg_transport_to_tcp (mio_svc_dnc_t* dnc, mio_dns_msg_t* re
MIO_ASSERT (mio, reqmsgxtn->rtmridx == MIO_TMRIDX_INVALID); /* ensure no timer job scheduled at this moment */ MIO_ASSERT (mio, reqmsgxtn->rtmridx == MIO_TMRIDX_INVALID); /* ensure no timer job scheduled at this moment */
reqmsgxtn->dev = dnc->tcp_sck; reqmsgxtn->dev = dnc->tcp_sck;
reqmsgxtn->rtries = 0; reqmsgxtn->rtries = 0;
if (!reqmsgxtn->pending && mio_dns_msg_to_pkt(reqmsg)->qr == 0) chain_pending_dns_reqmsg (dnc, reqmsg);
printf ("SWITCHED >>>>>>>>>>>>>>>>> %p %p %p %p %p\n", reqmsg, reqmsgxtn, reqmsgxtn->dev, dnc->udp_sck, dnc->tcp_sck); printf ("SWITCHED >>>>>>>>>>>>>>>>> %p %p %p %p %p\n", reqmsg, reqmsgxtn, reqmsgxtn->dev, dnc->udp_sck, dnc->tcp_sck);
if (MIO_DEV_SCK_GET_PROGRESS(dnc->tcp_sck) & MIO_DEV_SCK_CONNECTED) if (MIO_DEV_SCK_GET_PROGRESS(dnc->tcp_sck) & MIO_DEV_SCK_CONNECTED)
{ {
write_dns_msg_over_tcp (reqmsgxtn->dev, reqmsg); if (write_dns_msg_over_tcp(reqmsgxtn->dev, reqmsg) <= -1)
/* the caller must not use reqmsg from now because write_dns_msg_over_tcp() may release 'reqmsg' */ {
/* the caller must not use reqmsg from now because it's freed here */
if (MIO_LIKELY(reqmsgxtn->on_done)) reqmsgxtn->on_done (dnc, reqmsg, mio_geterrnum(mio), MIO_NULL, 0);
release_dns_msg (dnc, reqmsg);
}
} }
return 0; return 0;
@ -737,36 +777,28 @@ void mio_svc_dnc_stop (mio_svc_dnc_t* dnc)
mio_freemem (mio, dnc); mio_freemem (mio, dnc);
} }
mio_dns_msg_t* mio_svc_dnc_sendmsg (mio_svc_dnc_t* dnc, mio_dns_bhdr_t* bdns, mio_dns_bqr_t* qr, mio_oow_t qr_count, mio_dns_brr_t* rr, mio_oow_t rr_count, mio_dns_bedns_t* edns, mio_svc_dnc_on_done_t on_done, mio_oow_t xtnsize)
static MIO_INLINE int send_dns_msg (mio_svc_dnc_t* dnc, mio_dns_msg_t* msg, int prefer_tcp)
{
dnc_dns_msg_xtn_t* msgxtn = dnc_dns_msg_getxtn(msg);
mio_ntime_t* tmout;
if (prefer_tcp && switch_reqmsg_transport_to_tcp(dnc, msg) >= 0) return 0;
tmout = MIO_IS_POS_NTIME(&msgxtn->wtmout)? &msgxtn->wtmout: MIO_NULL;
/* TODO: optionally, override dnc->serv_addr and use the target address passed as a parameter */
return mio_dev_sck_timedwrite(dnc->udp_sck, mio_dns_msg_to_pkt(msg), msg->pktlen, tmout, msg, &msgxtn->servaddr);
}
mio_dns_msg_t* mio_svc_dnc_sendmsg (mio_svc_dnc_t* dnc, mio_dns_bhdr_t* bdns, mio_dns_bqr_t* qr, mio_oow_t qr_count, mio_dns_brr_t* rr, mio_oow_t rr_count, mio_dns_bedns_t* edns, int prefer_tcp, mio_svc_dnc_on_done_t on_done, mio_oow_t xtnsize)
{ {
/* send a request or a response */ /* send a request or a response */
mio_dns_msg_t* msg; mio_dns_msg_t* msg;
dnc_dns_msg_xtn_t* msgxtn;
mio_ntime_t* tmout;
msg = mio_dns_make_msg(dnc->mio, bdns, qr, qr_count, rr, rr_count, edns, MIO_SIZEOF(*msgxtn) + xtnsize); msg = make_dns_msg(dnc, bdns, qr, qr_count, rr, rr_count, edns, on_done, xtnsize);
if (!msg) return MIO_NULL; if (!msg) return MIO_NULL;
if (bdns->id < 0) if (send_dns_msg(dnc, msg, prefer_tcp) <= -1) /* TODO: determine to prefer tcp or not before sending */
{
mio_dns_pkt_t* pkt = mio_dns_msg_to_pkt(msg);
pkt->id = mio_hton16(dnc->seq);
dnc->seq++;
}
msgxtn = dnc_dns_msg_getxtn(msg);
msgxtn->dev = dnc->udp_sck;
msgxtn->rtmridx = MIO_TMRIDX_INVALID;
msgxtn->on_done = on_done;
msgxtn->wtmout = dnc->send_tmout;
msgxtn->rtmout = dnc->reply_tmout;
msgxtn->rmaxtries = dnc->reply_tmout_max_tries;
msgxtn->rtries = 0;
msgxtn->servaddr = dnc->serv_addr;
/* TODO: optionally, override dnc->serv_addr and use the target address passed as a parameter */
tmout = MIO_IS_POS_NTIME(&msgxtn->wtmout)? &msgxtn->wtmout: MIO_NULL;
if (mio_dev_sck_timedwrite(dnc->udp_sck, mio_dns_msg_to_pkt(msg), msg->pktlen, tmout, msg, &msgxtn->servaddr) <= -1)
{ {
release_dns_msg (dnc, msg); release_dns_msg (dnc, msg);
return MIO_NULL; return MIO_NULL;
@ -775,7 +807,7 @@ mio_dns_msg_t* mio_svc_dnc_sendmsg (mio_svc_dnc_t* dnc, mio_dns_bhdr_t* bdns, mi
return msg; return msg;
} }
mio_dns_msg_t* mio_svc_dnc_sendreq (mio_svc_dnc_t* dnc, mio_dns_bhdr_t* bdns, mio_dns_bqr_t* qr, mio_dns_bedns_t* edns, mio_svc_dnc_on_done_t on_done, mio_oow_t xtnsize) mio_dns_msg_t* mio_svc_dnc_sendreq (mio_svc_dnc_t* dnc, mio_dns_bhdr_t* bdns, mio_dns_bqr_t* qr, mio_dns_bedns_t* edns, int prefer_tcp, mio_svc_dnc_on_done_t on_done, mio_oow_t xtnsize)
{ {
/* send a request without resource records */ /* send a request without resource records */
if (bdns->rcode != MIO_DNS_RCODE_NOERROR) if (bdns->rcode != MIO_DNS_RCODE_NOERROR)
@ -784,7 +816,7 @@ mio_dns_msg_t* mio_svc_dnc_sendreq (mio_svc_dnc_t* dnc, mio_dns_bhdr_t* bdns, mi
return MIO_NULL; return MIO_NULL;
} }
return mio_svc_dnc_sendmsg(dnc, bdns, qr, 1, MIO_NULL, 0, edns, on_done, xtnsize); return mio_svc_dnc_sendmsg(dnc, bdns, qr, 1, MIO_NULL, 0, edns, prefer_tcp, on_done, xtnsize);
} }
/* ----------------------------------------------------------------------- */ /* ----------------------------------------------------------------------- */
@ -922,19 +954,25 @@ mio_dns_msg_t* mio_svc_dnc_resolve (mio_svc_dnc_t* dnc, const mio_bch_t* qname,
mio_dns_bqr_t qr; mio_dns_bqr_t qr;
mio_dns_msg_t* reqmsg; mio_dns_msg_t* reqmsg;
dnc_dns_msg_resolve_xtn_t* reqmsgxtn; dnc_dns_msg_resolve_xtn_t* resolxtn;
qr.qname = (mio_bch_t*)qname; qr.qname = (mio_bch_t*)qname;
qr.qtype = qtype; qr.qtype = qtype;
qr.qclass = MIO_DNS_RRC_IN; qr.qclass = MIO_DNS_RRC_IN;
reqmsg = mio_svc_dnc_sendmsg(dnc, &qhdr, &qr, 1, MIO_NULL, 0, &qedns, on_dnc_resolve, MIO_SIZEOF(*reqmsgxtn) + xtnsize); reqmsg = make_dns_msg(dnc, &qhdr, &qr, 1, MIO_NULL, 0, &qedns, on_dnc_resolve, MIO_SIZEOF(*resolxtn) + xtnsize);
if (reqmsg) if (reqmsg)
{ {
reqmsgxtn = dnc_dns_msg_resolve_getxtn(reqmsg); resolxtn = dnc_dns_msg_resolve_getxtn(reqmsg);
reqmsgxtn->on_resolve = on_resolve; resolxtn->on_resolve = on_resolve;
reqmsgxtn->qtype = qtype; resolxtn->qtype = qtype;
reqmsgxtn->flags = flags; resolxtn->flags = flags;
if (send_dns_msg(dnc, reqmsg, ((flags & MIO_SVC_DNC_RESOLVE_FLAG_PREFER_TCP) || qtype == MIO_DNS_RRT_Q_AFXR)) <= -1)
{
release_dns_msg (dnc, reqmsg);
return MIO_NULL;
}
} }
return reqmsg; return reqmsg;

5
mio/lib/mio-dns.h
View File

@ -392,7 +392,8 @@ typedef void (*mio_svc_dnc_on_resolve_t) (
enum mio_svc_dnc_resolve_flag_t enum mio_svc_dnc_resolve_flag_t
{ {
MIO_SVC_DNC_RESOLVE_FLAG_BRIEF = (1 << 0) MIO_SVC_DNC_RESOLVE_FLAG_BRIEF = (1 << 0),
MIO_SVC_DNC_RESOLVE_FLAG_PREFER_TCP = (1 << 1)
}; };
typedef enum mio_svc_dnc_resolve_flag_t mio_svc_dnc_resolve_flag_t; typedef enum mio_svc_dnc_resolve_flag_t mio_svc_dnc_resolve_flag_t;
@ -462,6 +463,7 @@ MIO_EXPORT mio_dns_msg_t* mio_svc_dnc_sendmsg (
mio_dns_brr_t* rr, mio_dns_brr_t* rr,
mio_oow_t rr_count, mio_oow_t rr_count,
mio_dns_bedns_t* edns, mio_dns_bedns_t* edns,
int prefer_tcp,
mio_svc_dnc_on_done_t on_done, mio_svc_dnc_on_done_t on_done,
mio_oow_t xtnsize mio_oow_t xtnsize
); );
@ -471,6 +473,7 @@ MIO_EXPORT mio_dns_msg_t* mio_svc_dnc_sendreq (
mio_dns_bhdr_t* bdns, mio_dns_bhdr_t* bdns,
mio_dns_bqr_t* qr, mio_dns_bqr_t* qr,
mio_dns_bedns_t* edns, mio_dns_bedns_t* edns,
int prefer_tcp,
mio_svc_dnc_on_done_t on_done, mio_svc_dnc_on_done_t on_done,
mio_oow_t xtnsize mio_oow_t xtnsize
); );