qse/lib/http/httpd-std-urs.h

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/*
* $Id$
*
Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.
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Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This file holds url rewriting support code and is included by httpd-std.c
*/
#define URS_SEQ_RANGE_SIZE (QSE_TYPE_MAX(qse_uint16_t) - 2)
#define URS_MAX_URL_LEN 50000
typedef struct urs_hdr_t urs_hdr_t;
typedef struct urs_pkt_t urs_pkt_t;
typedef struct urs_ctx_t urs_ctx_t;
typedef struct urs_req_t urs_req_t;
#include <qse/pack1.h>
struct urs_hdr_t
{
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qse_uint16_t seq; /* in network-byte order */
qse_uint16_t rcode; /* response code */
qse_uint32_t urlsum; /* checksum of url in the request */
qse_uint16_t pktlen; /* packet header size + url length */
};
struct urs_pkt_t
{
struct urs_hdr_t hdr;
qse_mchar_t url[1];
};
#include <qse/unpack.h>
struct urs_ctx_t
{
qse_httpd_t* httpd;
qse_httpd_urs_t* urs;
qse_skad_t skad;
int skadlen;
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int urs_socket; /* default urs socket to use */
qse_uint16_t seq; /* TODO: change to uint32_t??? */
urs_req_t* reqs[1024]; /* TOOD: choose the right size */
qse_uint16_t req_count;
qse_uint8_t rcvbuf[QSE_SIZEOF(urs_hdr_t) + URS_MAX_URL_LEN + 1];
qse_uint8_t fmtbuf[QSE_SIZEOF(urs_hdr_t) + URS_MAX_URL_LEN + 1];
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#if defined(AF_UNIX)
struct sockaddr_un unix_bind_addr;
#endif
};
struct urs_req_t
{
qse_uint16_t seq; /* in host-byte order */
qse_uint32_t pktlen;
urs_pkt_t* pkt;
qse_httpd_rewrite_t rewrite;
void* ctx;
urs_ctx_t* dc;
qse_skad_t urs_skad;
int urs_skadlen;
int urs_socket;
int urs_retries;
qse_ntime_t urs_tmout;
qse_tmr_index_t tmr_tmout;
urs_req_t* prev;
urs_req_t* next;
};
static int urs_open (qse_httpd_t* httpd, qse_httpd_urs_t* urs)
{
qse_nwad_t nwad;
urs_ctx_t* dc;
httpd_xtn_t* httpd_xtn = GET_HTTPD_XTN(httpd);
int type, proto = 0; /*IPPROTO_UDP;*/ /*IPPROTO_SCTP*/
urs->handle[0] = QSE_INVALID_SCKHND;
urs->handle[1] = QSE_INVALID_SCKHND;
urs->handle[2] = QSE_INVALID_SCKHND;
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dc = (urs_ctx_t*) qse_httpd_callocmem (httpd, QSE_SIZEOF(urs_ctx_t));
if (dc == NULL) goto oops;
dc->httpd = httpd;
dc->urs = urs;
nwad = httpd_xtn->urs.nwad;
if (nwad.type != QSE_NWAD_NX && qse_getnwadport(&nwad) == 0)
qse_setnwadport (&nwad, qse_hton16(QSE_HTTPD_URSSTD_DEFAULT_PORT));
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#if defined(QSE_HTTPD_DEBUG)
{
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qse_mchar_t tmp[128];
qse_nwadtombs (&nwad, tmp, QSE_COUNTOF(tmp), QSE_NWADTOMBS_ALL);
HTTPD_DBGOUT1 ("Default URS server set to [%hs]\n", tmp);
}
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#endif
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#if defined(IPPROTO_SCTP)
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type = (proto == IPPROTO_SCTP)? SOCK_SEQPACKET: SOCK_DGRAM;
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#else
type = SOCK_DGRAM;
#endif
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urs->handle[0] = open_client_socket (httpd, AF_INET, type, proto);
#if defined(AF_INET6)
urs->handle[1] = open_client_socket (httpd, AF_INET6, type, proto);
#endif
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#if defined(AF_UNIX)
urs->handle[2] = open_client_socket (httpd, AF_UNIX, type, 0);
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#endif
if (qse_is_sck_valid(urs->handle[2]))
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{
#if defined(AF_UNIX)
qse_ntime_t now;
qse_gettime (&now);
QSE_MEMSET (&dc->unix_bind_addr, 0, QSE_SIZEOF(dc->unix_bind_addr));
dc->unix_bind_addr.sun_family = AF_UNIX;
/* TODO: make the location(/tmp) or the prefix(.urs-) of the socket file configurable??? */
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qse_mbsxfmt (
dc->unix_bind_addr.sun_path,
QSE_COUNTOF(dc->unix_bind_addr.sun_path),
QSE_MT("/tmp/.urs-%x-%lu"), (int)QSE_GETPID(), (unsigned long int)urs->handle[2]);
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QSE_UNLINK (dc->unix_bind_addr.sun_path);
if (bind (urs->handle[2], (struct sockaddr*)&dc->unix_bind_addr, QSE_SIZEOF(dc->unix_bind_addr)) <= -1)
{
qse_httpd_seterrnum (httpd, SKERR_TO_ERRNUM());
qse_close_sck (urs->handle[2]);
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urs->handle[2] = QSE_INVALID_SCKHND;
}
#endif
}
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if (!qse_is_sck_valid(urs->handle[0]) &&
!qse_is_sck_valid(urs->handle[1]) &&
!qse_is_sck_valid(urs->handle[2]))
{
/* don't set the error number here.
* open_client_socket() or bind() above should set the error number */
goto oops;
}
/* carry on regardless of success or failure */
dc->skadlen = qse_nwadtoskad (&nwad, &dc->skad);
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/* determine which socket to use when sending a request to the default server */
if (dc->skadlen >= 0)
{
switch (nwad.type)
{
case QSE_NWAD_IN4:
dc->urs_socket = urs->handle[0];
break;
case QSE_NWAD_IN6:
dc->urs_socket = urs->handle[1];
break;
case QSE_NWAD_LOCAL:
dc->urs_socket = urs->handle[2];
break;
default:
/* unsupported address for the default server */
dc->urs_socket = QSE_INVALID_SCKHND;
break;
}
}
else
{
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dc->urs_socket = QSE_INVALID_SCKHND;
}
#if 0
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if (proto == IPPROTO_SCTP)
{
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/* TODO: error handling */
if (qse_is_sck_valid(urs->handle[0])) listen (urs->handle[0], 99);
if (qse_is_sck_valid(urs->handle[1])) listen (urs->handle[1], 99);
/* handle[2] is a unix socket. no special handling for SCTP */
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}
#endif
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urs->handle_count = 3;
if (qse_is_sck_valid(urs->handle[0])) urs->handle_mask |= (1 << 0);
if (qse_is_sck_valid(urs->handle[1])) urs->handle_mask |= (1 << 1);
if (qse_is_sck_valid(urs->handle[2])) urs->handle_mask |= (1 << 2);
urs->ctx = dc;
return 0;
oops:
if (qse_is_sck_valid(urs->handle[0])) qse_close_sck (urs->handle[0]);
if (qse_is_sck_valid(urs->handle[1])) qse_close_sck (urs->handle[1]);
if (qse_is_sck_valid(urs->handle[2]))
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{
qse_close_sck (urs->handle[2]);
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#if defined(AF_UNIX)
QSE_UNLINK (dc->unix_bind_addr.sun_path);
#endif
}
if (dc) qse_httpd_freemem (httpd, dc);
return -1;
}
static void urs_remove_tmr_tmout (qse_httpd_t* httpd, urs_req_t* req)
{
if (req->tmr_tmout != QSE_TMR_INVALID_INDEX)
{
qse_httpd_remove_timer_event (httpd, req->tmr_tmout);
req->tmr_tmout = QSE_TMR_INVALID_INDEX;
}
}
static void urs_close (qse_httpd_t* httpd, qse_httpd_urs_t* urs)
{
urs_ctx_t* dc = (urs_ctx_t*)urs->ctx;
qse_size_t i;
for (i = 0; i < QSE_COUNTOF(dc->reqs); i++)
{
urs_req_t* next_req;
while (dc->reqs[i])
{
next_req = dc->reqs[i]->next;
urs_remove_tmr_tmout (httpd, dc->reqs[i]);
qse_httpd_freemem (httpd, dc->reqs[i]);
dc->reqs[i] = next_req;
dc->req_count--;
}
}
QSE_ASSERT (dc->req_count == 0);
if (qse_is_sck_valid(urs->handle[0])) qse_close_sck (urs->handle[0]);
if (qse_is_sck_valid(urs->handle[1])) qse_close_sck (urs->handle[1]);
if (qse_is_sck_valid(urs->handle[2]))
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{
qse_close_sck (urs->handle[2]);
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#if defined(AF_UNIX)
QSE_UNLINK (dc->unix_bind_addr.sun_path);
#endif
}
qse_httpd_freemem (httpd, urs->ctx);
}
static int urs_recv (qse_httpd_t* httpd, qse_httpd_urs_t* urs, qse_httpd_hnd_t handle)
{
urs_ctx_t* dc = (urs_ctx_t*)urs->ctx;
/*httpd_xtn_t* httpd_xtn = GET_HTTPD_XTN(httpd);*/
qse_skad_t fromaddr;
qse_sck_len_t fromlen;
qse_uint16_t xid;
qse_ssize_t len, url_len;
urs_pkt_t* pkt;
urs_req_t* req;
qse_mchar_t* spc;
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/* TODO: use recvmsg with MSG_ERRQUEUE... set socket option IP_RECVERR... */
fromlen = QSE_SIZEOF(fromaddr);
len = recvfrom (handle, dc->rcvbuf, QSE_SIZEOF(dc->rcvbuf) - 1, 0, (struct sockaddr*)&fromaddr, &fromlen);
/* TODO: check if fromaddr matches the dc->skad... */
pkt = (urs_pkt_t*)dc->rcvbuf;
if (len >= QSE_SIZEOF(urs_hdr_t))
{
pkt->hdr.pktlen = qse_ntoh16(pkt->hdr.pktlen);
if (len == pkt->hdr.pktlen)
{
url_len = pkt->hdr.pktlen - QSE_SIZEOF(urs_hdr_t);
xid = qse_ntoh16(pkt->hdr.seq) % QSE_COUNTOF(dc->reqs);
for (req = dc->reqs[xid]; req; req = req->next)
{
if (req->pkt->hdr.seq == pkt->hdr.seq && req->pkt->hdr.urlsum == pkt->hdr.urlsum)
{
/* null-terminate the url for easier processing */
pkt->url[url_len] = QSE_MT('\0');
/* drop trailers starting from the first space onwards */
spc = qse_mbschr (pkt->url, QSE_MT(' '));
if (spc) *spc = QSE_MT('\0');
urs_remove_tmr_tmout (httpd, req);
req->rewrite (httpd, req->pkt->url, pkt->url, req->ctx);
/* detach the request off dc->reqs */
if (req == dc->reqs[xid]) dc->reqs[xid] = req->next;
else req->prev->next = req->next;
if (req->next) req->next->prev = req->prev;
qse_httpd_freemem (httpd, req);
dc->req_count--;
break;
}
}
}
}
return 0;
}
static void tmr_urs_tmout_update (qse_tmr_t* tmr, qse_tmr_index_t old_index, qse_tmr_index_t new_index, qse_tmr_event_t* evt)
{
urs_req_t* req = (urs_req_t*)evt->ctx;
QSE_ASSERT (req->tmr_tmout == old_index);
req->tmr_tmout = new_index;
}
static void tmr_urs_tmout_handle (qse_tmr_t* tmr, const qse_ntime_t* now, qse_tmr_event_t* evt)
{
/* destory the unanswered request if timed out */
urs_req_t* req = (urs_req_t*)evt->ctx;
urs_ctx_t* dc = req->dc;
qse_uint16_t xid;
/* when this handler is called, the event should be removed from the timer */
QSE_ASSERT (req->tmr_tmout == QSE_TMR_INVALID_INDEX);
/* ---------------------------------------------------------------
* resend
*---------------------------------------------------------------- */
if (req->urs_retries > 0)
{
/*httpd_xtn_t* httpd_xtn = GET_HTTPD_XTN(dc->httpd);*/
qse_tmr_event_t tmout_event;
QSE_MEMSET (&tmout_event, 0, QSE_SIZEOF(tmout_event));
qse_gettime (&tmout_event.when);
qse_add_ntime (&tmout_event.when, &req->urs_tmout, &tmout_event.when);
tmout_event.ctx = req;
tmout_event.handler = tmr_urs_tmout_handle;
tmout_event.updater = tmr_urs_tmout_update;
if (sendto (req->urs_socket, (void*)req->pkt, req->pktlen, 0, (struct sockaddr*)&req->urs_skad, req->urs_skadlen) != req->pktlen)
{
/* error. fall thru */
qse_httpd_seterrnum (dc->httpd, SKERR_TO_ERRNUM());
/* Unix datagram socket seems to fail with EAGAIN often
* even with increased SO_SNDBUF size. */
if (dc->httpd->errnum == QSE_HTTPD_EAGAIN && req->urs_retries > 1)
{
/* TODO: check writability of req->urs_socket instead of just retrying... */
goto send_ok;
}
}
else
{
send_ok:
QSE_ASSERT (tmr == dc->httpd->tmr);
if (qse_httpd_insert_timer_event (dc->httpd, &tmout_event, &req->tmr_tmout) >= 0)
{
req->urs_retries--;
return; /* resend ok */
}
}
}
printf ("urs timed out....\n");
/* ---------------------------------------------------------------
* timed out + no resend
*---------------------------------------------------------------- */
xid = req->seq % QSE_COUNTOF(dc->reqs);
/* detach the request off dc->reqs */
if (req == dc->reqs[xid]) dc->reqs[xid] = req->next;
else req->prev->next = req->next;
if (req->next) req->next->prev = req->prev;
/* urs timed out. report that name resolution failed */
req->rewrite (dc->httpd, req->pkt->url, QSE_NULL, req->ctx);
/* i don't cache the items that have timed out */
qse_httpd_freemem (dc->httpd, req);
dc->req_count--;
}
static int urs_send (qse_httpd_t* httpd, qse_httpd_urs_t* urs, const qse_mchar_t* url, qse_httpd_rewrite_t rewrite, const qse_httpd_urs_server_t* urs_server, void* ctx)
{
urs_ctx_t* dc = (urs_ctx_t*)urs->ctx;
httpd_xtn_t* httpd_xtn = GET_HTTPD_XTN(httpd);
qse_uint16_t xid;
qse_uint32_t seq;
urs_req_t* req = QSE_NULL;
qse_size_t url_len;
qse_tmr_event_t tmout_event;
if (dc->req_count >= QSE_COUNTOF(dc->reqs))
{
/* too many pending requests */
qse_httpd_seterrnum (httpd, QSE_HTTPD_ENOBUF);
goto oops;
}
url_len = qse_mbslen(url);
if (url_len > URS_MAX_URL_LEN) /* TODO: change the limit */
{
qse_httpd_seterrnum (httpd, QSE_HTTPD_EINVAL);
goto oops;
}
seq = ((qse_uint32_t)dc->seq + 1) % URS_SEQ_RANGE_SIZE;
dc->seq = seq;
xid = seq % QSE_COUNTOF(dc->reqs);
req = qse_httpd_callocmem (httpd, QSE_SIZEOF(*req) + QSE_SIZEOF(urs_hdr_t) + url_len + 1);
if (req == QSE_NULL) goto oops;
req->tmr_tmout = QSE_TMR_INVALID_INDEX;
req->seq = seq;
req->pkt = (urs_pkt_t*)(req + 1);
req->pktlen = QSE_SIZEOF(urs_hdr_t) + url_len;
req->pkt->hdr.seq = qse_hton16(seq);
req->pkt->hdr.pktlen = qse_hton16(req->pktlen);
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req->pkt->hdr.urlsum = hash_string (url);
qse_mbscpy (req->pkt->url, url);
req->rewrite = rewrite;
req->ctx = ctx;
req->urs_retries = httpd_xtn->urs.retries;
req->urs_tmout = httpd_xtn->urs.tmout;
if (urs_server)
{
if (urs_server->retries >= 0) req->urs_retries = urs_server->retries;
if (urs_server->tmout.sec >= 0) req->urs_tmout = urs_server->tmout;
req->urs_skadlen = qse_nwadtoskad (&urs_server->nwad, &req->urs_skad);
if (req->urs_skadlen <= -1) goto default_urs_server;
switch (urs_server->nwad.type)
{
case QSE_NWAD_IN4:
req->urs_socket = urs->handle[0];
break;
case QSE_NWAD_IN6:
req->urs_socket = urs->handle[1];
break;
case QSE_NWAD_LOCAL:
req->urs_socket = urs->handle[2];
break;
default:
/* TODO: should it return failure with QSE_HTTPD_EINVAL? */
goto default_urs_server;
}
}
else
{
default_urs_server:
if (dc->skadlen >= 0)
{
/* the default url rewrite server address set in urs_open
* is valid. */
req->urs_skad = dc->skad;
req->urs_skadlen = dc->skadlen;
req->urs_socket = dc->urs_socket;
}
else
{
qse_httpd_seterrnum (httpd, QSE_HTTPD_ENOURS);
goto oops;
}
}
QSE_MEMSET (&tmout_event, 0, QSE_SIZEOF(tmout_event));
qse_gettime (&tmout_event.when);
qse_add_ntime (&tmout_event.when, &req->urs_tmout, &tmout_event.when);
tmout_event.ctx = req;
tmout_event.handler = tmr_urs_tmout_handle;
tmout_event.updater = tmr_urs_tmout_update;
if (qse_httpd_insert_timer_event (httpd, &tmout_event, &req->tmr_tmout) <= -1) goto oops;
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/*
{
struct msghdr msg;
struct iovec iov;
QSE_MEMSET (&msg, 0, QSE_SIZEOF(msg));
msg.msg_name = &req->urs_skad;
msg.msg_namelen = req->urs_skadlen;
iov.iov_base = req->pkt;
iov.iov_len = req->pktlen;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
if (sendmsg (req->urs_socket, &msg, 0) != req->pktlen)
}
*/
if (sendto (req->urs_socket, (void*)req->pkt, req->pktlen, 0, (struct sockaddr*)&req->urs_skad, req->urs_skadlen) != req->pktlen)
{
qse_httpd_seterrnum (httpd, SKERR_TO_ERRNUM());
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printf ("URS SENDTO FAILURE........................\n"); /* TODO: logging */
/* Unix datagram socket seems to fail with EAGAIN often
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* even with increased SO_SNDBUF size. */
if (httpd->errnum == QSE_HTTPD_EAGAIN && req->urs_retries > 0)
{
/* TODO: check writability of req->urs_socket instead of just retrying... */
goto send_ok;
}
goto oops;
}
send_ok:
req->dc = dc;
/* link the request to the front of the chain */
if (dc->reqs[xid]) dc->reqs[xid]->prev = req;
req->next = dc->reqs[xid];
dc->reqs[xid] = req;
/* increment the number of pending requests */
dc->req_count++;
return 0;
oops:
if (req)
{
urs_remove_tmr_tmout (httpd, req);
qse_httpd_freemem (httpd, req);
}
return -1;
}
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static int urs_prerewrite (qse_httpd_t* httpd, qse_httpd_client_t* client, qse_htre_t* req, const qse_mchar_t* host, qse_mchar_t** url)
{
const qse_mchar_t* qpath;
int mtype;
const qse_mchar_t* mname;
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const qse_mchar_t* quest;
const qse_mchar_t* qparam;
const qse_mchar_t* proto;
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const qse_mchar_t* host_ptr = QSE_NULL;
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qse_mchar_t cliaddrbuf[MAX_NWAD_TEXT_SIZE];
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qse_size_t total_len;
qse_mchar_t* url_to_rewrite;
qpath = qse_htre_getqpath(req);
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qparam = qse_htre_getqparam(req);
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mtype = qse_htre_getqmethodtype(req);
mname = qse_htre_getqmethodname(req);
total_len = qse_mbslen(qpath) + qse_mbslen(mname);
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if (qparam)
{
quest = QSE_MT("?");
total_len = total_len + 1 + qse_mbslen(qparam);
}
else
{
qparam = QSE_MT("");
quest = QSE_MT("");
}
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if (host)
{
/* use the host name set explicitly by the caller */
host_ptr = host;
total_len += qse_mbslen(host_ptr);
}
else
{
/* find the host name in the http header */
const qse_htre_hdrval_t* hosthv;
hosthv = qse_htre_getheaderval(req, QSE_MT("Host"));
if (hosthv)
{
/* the first host header only */
host_ptr = hosthv->ptr;
total_len += hosthv->len;
}
}
total_len += qse_nwadtombs (&client->remote_addr, cliaddrbuf, QSE_COUNTOF(cliaddrbuf), QSE_NWADTOMBS_ADDR);
total_len += 128; /* extra space */
url_to_rewrite = qse_httpd_allocmem (httpd, total_len);
if (url_to_rewrite == QSE_NULL) return -1;
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if (mtype == QSE_HTTP_CONNECT || !host_ptr)
{
host_ptr = QSE_MT("");
proto = QSE_MT("");
}
else if (client->status & QSE_HTTPD_CLIENT_SECURE)
{
proto = QSE_MT("https://");
}
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else
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{
proto = QSE_MT("http://");
}
/* URL client-ip/client-fqdn ident method */
qse_mbsxfmt (url_to_rewrite, total_len, QSE_MT("%s%s%s%s%s %s/- - %s"), proto, host_ptr, qpath, quest, qparam, cliaddrbuf, mname);
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*url = url_to_rewrite;
return 1;
}