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trans.c
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trans.c
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/* trans.c
Routines to handle file transfers.
Copyright (C) 1992, 1993, 1995, 2002 Ian Lance Taylor
This file is part of the Taylor UUCP package.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
The author of the program may be contacted at ian@airs.com.
*/
#include "uucp.h"
#if USE_RCS_ID
const char trans_rcsid[] = "$Id$";
#endif
#include <errno.h>
#include "uudefs.h"
#include "uuconf.h"
#include "prot.h"
#include "system.h"
#include "trans.h"
/* To avoid wasting a lot of time scanning the spool directory, which
might cause the remote system to time out, we limit each scan to
pick up at most a certain number of files. */
#define COMMANDS_PER_SCAN (200)
/* The structure we use when waiting for an acknowledgement of a
confirmed received file in fsent_receive_ack. */
struct sreceive_ack
{
struct sreceive_ack *qnext;
char *zto;
char *ztemp;
boolean fmarked;
};
/* Local functions. */
static void utqueue P((struct stransfer **, struct stransfer *,
boolean fhead));
static void utdequeue P((struct stransfer *));
static void utchanalc P((struct sdaemon *qdaemon, struct stransfer *qtrans));
__inline__ static struct stransfer *qtchan P((int ichan));
__inline__ static void utchanfree P((struct stransfer *qtrans));
static void utfree_queue P((struct stransfer **pq));
static boolean fttime P((struct sdaemon *qdaemon, long *pisecs,
long *pimicros));
static boolean fcheck_queue P((struct sdaemon *qdaemon));
static boolean ftadd_cmd P((struct sdaemon *qdaemon, const char *z,
size_t cdata, int iremote, boolean flast));
static boolean fremote_hangup_reply P((struct stransfer *qtrans,
struct sdaemon *qdaemon));
static void utfree_receive_ack P((struct sreceive_ack *q));
static void utfree_acked P((void));
static boolean flocal_poll_file P((struct stransfer *qtrans,
struct sdaemon *qdaemon));
/* Queue of transfer structures that are ready to start which have
been requested by the local system. These are only permitted to
start when the local system is the master. */
static struct stransfer *qTlocal;
/* Queue of transfer structures that are ready to start which have
been requested by the remote system. These are responses to
commands received from the remote system, and should be started as
soon as possible. */
static struct stransfer *qTremote;
/* Queue of transfer structures that have been started and want to
send information. This should be static, but the 'a' protocol
looks at it, at least for now. */
struct stransfer *qTsend;
/* Queue of transfer structures that have been started and are waiting
to receive information. */
static struct stransfer *qTreceive;
/* Queue of free transfer structures. */
static struct stransfer *qTavail;
/* Array of transfer structures indexed by local channel number. This
is maintained for local jobs. */
static struct stransfer *aqTchan[IMAX_CHAN + 1];
/* Number of local channel numbers currently allocated. */
static int cTchans;
/* Next channel number to allocate. */
static int iTchan;
/* Array of transfer structures indexed by remote channel number.
This is maintained for remote jobs. */
static struct stransfer *aqTremote[IMAX_CHAN + 1];
/* The transaction we are currently receiving. This is used to avoid
getting the time too frequently. */
static struct stransfer *qTtiming_rec;
/* The time from which to charge any received data. This is either
the last time we charged for received data, or the last time
something was put on the empty receive queue. */
static long iTrecsecs;
static long iTrecmicros;
/* The minimum amount of time, in seconds, to wait between times we
check the spool directory, if we are busy transferring data. If we
have nothing to do, we will check the spool directory regardless of
how long ago the last check was. This should probably be
configurable. */
#define CCHECKWAIT (600)
/* The time we last checked the spool directory for work. This is set
from the return value of ixsysdep_process_time, not ixsysdep_time,
for convenience in the routines which use it. */
static long iTchecktime;
/* The size of the command we have read so far in ftadd_cmd. */
static size_t cTcmdlen;
/* A list of structures used when waiting for an acknowledgement of a
confirmed received file in fsent_receive_ack. */
static struct sreceive_ack *qTreceive_ack;
/* Queue up a transfer structure before *pq. This puts it at the head
or the tail of the list headed by *pq. */
static void
utqueue (struct stransfer **pq, struct stransfer *q, boolean fhead)
{
if (*pq == NULL)
{
*pq = q;
q->qprev = q->qnext = q;
}
else
{
q->qnext = *pq;
q->qprev = (*pq)->qprev;
q->qprev->qnext = q;
q->qnext->qprev = q;
if (fhead)
*pq = q;
}
q->pqqueue = pq;
}
/* Dequeue a transfer structure. */
static void
utdequeue (struct stransfer *q)
{
if (q->pqqueue != NULL)
{
if (*(q->pqqueue) == q)
{
if (q->qnext == q)
*(q->pqqueue) = NULL;
else
*(q->pqqueue) = q->qnext;
}
q->pqqueue = NULL;
}
if (q->qprev != NULL)
q->qprev->qnext = q->qnext;
if (q->qnext != NULL)
q->qnext->qprev = q->qprev;
q->qprev = NULL;
q->qnext = NULL;
}
/* Queue up a transfer structure requested by the local system. */
/*ARGSIGNORED*/
boolean
fqueue_local (struct sdaemon *qdaemon ATTRIBUTE_UNUSED, struct stransfer *qtrans)
{
utdequeue (qtrans);
utqueue (&qTlocal, qtrans, FALSE);
return TRUE;
}
/* Queue up a transfer structure requested by the remote system. The
stransfer structure should have the iremote field set. We need to
record it, so that any subsequent data associated with this
channel can be routed to the right place. */
boolean
fqueue_remote (struct sdaemon *qdaemon ATTRIBUTE_UNUSED, struct stransfer *qtrans)
{
DEBUG_MESSAGE1 (DEBUG_UUCP_PROTO, "fqueue_remote: Channel %d",
qtrans->iremote);
if (qtrans->iremote > 0)
aqTremote[qtrans->iremote] = qtrans;
utdequeue (qtrans);
utqueue (&qTremote, qtrans, FALSE);
return TRUE;
}
/* Queue up a transfer with something to send. */
boolean
fqueue_send (struct sdaemon *qdaemon ATTRIBUTE_UNUSED, struct stransfer *qtrans)
{
#if DEBUG > 0
if (qtrans->psendfn == NULL)
ulog (LOG_FATAL, "fqueue_send: Bad call");
#endif
utdequeue (qtrans);
/* Sort the send queue to always send commands before files, and to
sort jobs by grade. */
if (qTsend == NULL)
utqueue (&qTsend, qtrans, FALSE);
else
{
register struct stransfer *q;
boolean ffirst;
ffirst = TRUE;
q = qTsend;
do
{
if (! qtrans->fsendfile && q->fsendfile)
break;
if ((! qtrans->fsendfile || q->fsendfile)
&& UUCONF_GRADE_CMP (qtrans->s.bgrade, q->s.bgrade) < 0)
break;
ffirst = FALSE;
q = q->qnext;
}
while (q != qTsend);
qtrans->qnext = q;
qtrans->qprev = q->qprev;
q->qprev = qtrans;
qtrans->qprev->qnext = qtrans;
if (ffirst)
qTsend = qtrans;
qtrans->pqqueue = &qTsend;
}
return TRUE;
}
/* Queue up a transfer with something to receive. */
boolean
fqueue_receive (struct sdaemon *qdaemon ATTRIBUTE_UNUSED, struct stransfer *qtrans)
{
#if DEBUG > 0
if (qtrans->precfn == NULL)
ulog (LOG_FATAL, "fqueue_receive: Bad call");
#endif
/* If this is the only item on the receive queue, we do not want to
charge it for any time during which we have not been waiting for
anything, so update the receive timestamp. */
if (qTreceive == NULL)
iTrecsecs = ixsysdep_process_time (&iTrecmicros);
utdequeue (qtrans);
utqueue (&qTreceive, qtrans, FALSE);
return TRUE;
}
/* Get a new local channel number. */
static void
utchanalc (struct sdaemon *qdaemon, struct stransfer *qtrans)
{
do
{
++iTchan;
if (iTchan > qdaemon->cchans)
iTchan = 1;
}
while (aqTchan[iTchan] != NULL);
qtrans->ilocal = iTchan;
aqTchan[iTchan] = qtrans;
++cTchans;
}
/* Return the transfer for a channel number. */
__inline__
static struct stransfer *
qtchan (int ic)
{
return aqTchan[ic];
}
/* Clear the channel number for a transfer. */
__inline__
static void
utchanfree (struct stransfer *qt)
{
if (qt->ilocal != 0)
{
aqTchan[qt->ilocal] = NULL;
qt->ilocal = 0;
--cTchans;
}
}
/* Allocate a new transfer structure. */
struct stransfer *
qtransalc (struct scmd *qcmd)
{
register struct stransfer *q;
q = qTavail;
if (q != NULL)
utdequeue (q);
else
q = (struct stransfer *) xmalloc (sizeof (struct stransfer));
q->qnext = NULL;
q->qprev = NULL;
q->pqqueue = NULL;
q->psendfn = NULL;
q->precfn = NULL;
q->pinfo = NULL;
q->fsendfile = FALSE;
q->frecfile = FALSE;
q->e = EFILECLOSED;
q->ipos = 0;
q->fcmd = FALSE;
q->zcmd = NULL;
q->ccmd = 0;
q->ilocal = 0;
q->iremote = 0;
if (qcmd != NULL)
{
q->s = *qcmd;
q->s.zfrom = zbufcpy (qcmd->zfrom);
q->s.zto = zbufcpy (qcmd->zto);
q->s.zuser = zbufcpy (qcmd->zuser);
q->s.zoptions = zbufcpy (qcmd->zoptions);
q->s.ztemp = zbufcpy (qcmd->ztemp);
q->s.znotify = zbufcpy (qcmd->znotify);
q->s.zcmd = zbufcpy (qcmd->zcmd);
}
else
{
q->s.zfrom = NULL;
q->s.zto = NULL;
q->s.zuser = NULL;
q->s.zoptions = NULL;
q->s.ztemp = NULL;
q->s.znotify = NULL;
q->s.zcmd = NULL;
}
q->zlog = NULL;
q->isecs = 0;
q->imicros = 0;
q->cbytes = 0;
return q;
}
/* Free a transfer structure. This does not free any pinfo
information that may have been allocated. */
void
utransfree (struct stransfer *q)
{
ubuffree (q->zcmd);
ubuffree ((char *) q->s.zfrom);
ubuffree ((char *) q->s.zto);
ubuffree ((char *) q->s.zuser);
ubuffree ((char *) q->s.zoptions);
ubuffree ((char *) q->s.ztemp);
ubuffree ((char *) q->s.znotify);
ubuffree ((char *) q->s.zcmd);
utchanfree (q);
if (q->iremote > 0)
{
aqTremote[q->iremote] = NULL;
q->iremote = 0;
}
if (ffileisopen (q->e))
{
(void) ffileclose (q->e);
q->e = EFILECLOSED;
}
#if DEBUG > 0
q->zcmd = NULL;
q->s.zfrom = NULL;
q->s.zto = NULL;
q->s.zuser = NULL;
q->s.zoptions = NULL;
q->s.ztemp = NULL;
q->s.znotify = NULL;
q->s.zcmd = NULL;
q->psendfn = NULL;
q->precfn = NULL;
#endif
/* Avoid any possible confusion in the timing code. */
if (qTtiming_rec == q)
qTtiming_rec = NULL;
utdequeue (q);
utqueue (&qTavail, q, FALSE);
}
/* Free a queue of transfer structures. */
static void
utfree_queue (struct stransfer **pq)
{
while (*pq != NULL)
utransfree (*pq);
}
/* Get the time. This is a wrapper around ixsysdep_process_time. If
enough time has elapsed since the last time we got the time, check
the work queue. */
static boolean
fttime (struct sdaemon *qdaemon, long int *pisecs, long int *pimicros)
{
*pisecs = ixsysdep_process_time (pimicros);
if (*pisecs - iTchecktime >= CCHECKWAIT)
{
if (! fcheck_queue (qdaemon))
return FALSE;
}
return TRUE;
}
/* Gather local commands and queue them up for later processing. Also
recompute time based control values. */
boolean
fqueue (struct sdaemon *qdaemon, boolean *pfany)
{
const struct uuconf_system *qsys;
long ival;
int bgrade;
struct uuconf_timespan *qlocal_size, *qremote_size;
if (pfany != NULL)
*pfany = FALSE;
qsys = qdaemon->qsys;
/* If we are not the caller, the grade will be set during the
initial handshake, although this may be overridden by the
calledtimegrade configuration option. */
if (! qdaemon->fcaller)
{
if (! ftimespan_match (qsys->uuconf_qcalledtimegrade, &ival,
(int *) NULL))
bgrade = qdaemon->bgrade;
else
bgrade = (char) ival;
}
else
{
if (! ftimespan_match (qsys->uuconf_qtimegrade, &ival,
(int *) NULL))
bgrade = '\0';
else
bgrade = (char) ival;
}
/* Determine the maximum sizes we can send and receive. */
if (qdaemon->fcaller)
{
qlocal_size = qsys->uuconf_qcall_local_size;
qremote_size = qsys->uuconf_qcall_remote_size;
}
else
{
qlocal_size = qsys->uuconf_qcalled_local_size;
qremote_size = qsys->uuconf_qcalled_remote_size;
}
if (! ftimespan_match (qlocal_size, &qdaemon->clocal_size, (int *) NULL))
qdaemon->clocal_size = (long) -1;
if (! ftimespan_match (qremote_size, &qdaemon->cremote_size, (int *) NULL))
qdaemon->cremote_size = (long) -1;
if (bgrade == '\0')
return TRUE;
if (! fsysdep_get_work_init (qsys, bgrade, COMMANDS_PER_SCAN))
return FALSE;
while (TRUE)
{
struct scmd s;
if (! fsysdep_get_work (qsys, bgrade, COMMANDS_PER_SCAN, &s))
return FALSE;
if (s.bcmd == 'H')
{
ulog_user ((const char *) NULL);
break;
}
if (s.bcmd == 'P')
{
struct stransfer *qtrans;
/* A poll file. */
ulog_user ((const char *) NULL);
qtrans = qtransalc (&s);
qtrans->psendfn = flocal_poll_file;
if (! fqueue_local (qdaemon, qtrans))
return FALSE;
continue;
}
ulog_user (s.zuser);
switch (s.bcmd)
{
case 'S':
case 'E':
if (! flocal_send_file_init (qdaemon, &s))
return FALSE;
break;
case 'R':
if (! flocal_rec_file_init (qdaemon, &s))
return FALSE;
break;
case 'X':
if (! flocal_xcmd_init (qdaemon, &s))
return FALSE;
break;
#if DEBUG > 0
default:
ulog (LOG_FATAL, "fqueue: Can't happen");
break;
#endif
}
}
if (pfany != NULL)
*pfany = qTlocal != NULL;
iTchecktime = ixsysdep_process_time ((long *) NULL);
return TRUE;
}
/* Clear everything off the work queue. This is used when the call is
complete, or if the call is never made. */
void
uclear_queue (struct sdaemon *qdaemon)
{
int i;
usysdep_get_work_free (qdaemon->qsys);
utfree_queue (&qTlocal);
utfree_queue (&qTremote);
utfree_queue (&qTsend);
utfree_queue (&qTreceive);
cTchans = 0;
iTchan = 0;
qTtiming_rec = NULL;
cTcmdlen = 0;
if (qTreceive_ack != NULL)
utfree_acked ();
for (i = 0; i < IMAX_CHAN + 1; i++)
{
aqTchan[i] = NULL;
aqTremote[i] = NULL;
}
}
/* Recheck the work queue during a conversation. This is only called
if it's been more than CCHECKWAIT seconds since the last time the
queue was checked. */
static boolean
fcheck_queue (struct sdaemon *qdaemon)
{
/* Only check if we are the master, or if there are multiple
channels, or if we aren't already trying to get the other side to
hang up. Otherwise, there's nothing we can do with any new jobs
we might find. */
if (qdaemon->fmaster
|| qdaemon->cchans > 1
|| ! qdaemon->frequest_hangup)
{
boolean fany;
DEBUG_MESSAGE0 (DEBUG_UUCP_PROTO,
"fcheck_queue: Rechecking work queue");
if (! fqueue (qdaemon, &fany))
return FALSE;
/* If we found something to do, and we're not the master, and we
don't have multiple channels to send new jobs over, try to
get the other side to hang up. */
if (fany && ! qdaemon->fmaster && qdaemon->cchans <= 1)
qdaemon->frequest_hangup = TRUE;
}
return TRUE;
}
/* The main transfer loop. The uucico daemon spends essentially all
its time in this function. */
boolean
floop (struct sdaemon *qdaemon)
{
boolean fret;
fret = TRUE;
while (! qdaemon->fhangup)
{
register struct stransfer *q;
#if DEBUG > 1
/* If we're doing any debugging, close the log and debugging
files regularly. This will let people copy them off and
remove them while the conversation is in progresss. */
if (iDebug != 0)
{
ulog_close ();
ustats_close ();
}
#endif
if (qdaemon->fmaster)
{
boolean fhangup;
/* We've managed to become the master, so we no longer want
to request a hangup. */
qdaemon->frequest_hangup = FALSE;
fhangup = FALSE;
if (qdaemon->fhangup_requested
&& qTsend == NULL
&& (qTreceive == NULL || qdaemon->cchans > 1))
{
/* The remote system has requested that we transfer
control by sending CYM after receiving a file. */
DEBUG_MESSAGE0 (DEBUG_UUCP_PROTO,
"floop: Transferring control at remote request");
fhangup = TRUE;
}
else if (qTremote == NULL
&& qTlocal == NULL
&& qTsend == NULL
&& qTreceive == NULL)
{
/* We don't have anything to do. Try to find some new
jobs. If we can't, transfer control. */
if (! fqueue (qdaemon, (boolean *) NULL))
{
fret = FALSE;
break;
}
if (qTlocal == NULL)
{
DEBUG_MESSAGE0 (DEBUG_UUCP_PROTO,
"floop: No work for master");
fhangup = TRUE;
}
}
if (fhangup)
{
if (! (*qdaemon->qproto->pfsendcmd) (qdaemon, "H", 0, 0))
{
fret = FALSE;
break;
}
qdaemon->fmaster = FALSE;
}
}
/* If we are no long the master, clear any requested hangup. We
may have already hung up before checking this variable in the
block above. */
if (! qdaemon->fmaster)
qdaemon->fhangup_requested = FALSE;
/* Immediately queue up any remote jobs. We don't need local
channel numbers for them, since we can disambiguate based on
the remote channel number. */
while (qTremote != NULL)
{
q = qTremote;
utdequeue (q);
utqueue (&qTsend, q, TRUE);
}
/* If we are the master, or if we have multiple channels, try to
queue up additional local jobs. */
if (qdaemon->fmaster || qdaemon->cchans > 1)
{
while (qTlocal != NULL && cTchans < qdaemon->cchans)
{
/* We have room for an additional channel. */
q = qTlocal;
if (! fqueue_send (qdaemon, q))
{
fret = FALSE;
break;
}
utchanalc (qdaemon, q);
}
if (! fret)
break;
}
q = qTsend;
if (q == NULL)
{
ulog_user ((const char *) NULL);
DEBUG_MESSAGE0 (DEBUG_UUCP_PROTO, "floop: Waiting for data");
if (! (*qdaemon->qproto->pfwait) (qdaemon))
{
fret = FALSE;
break;
}
}
else
{
ulog_user (q->s.zuser);
if (! q->fsendfile)
{
/* Technically, we should add the time required for this
call to q->isecs and q->imicros. In practice, the
amount of time required should be sufficiently small
that it can be safely disregarded. */
if (! (*q->psendfn) (q, qdaemon))
{
fret = FALSE;
break;
}
}
else
{
long isecs, imicros;
boolean fcharged;
long cmax_time;
long istart = 0;
long inextsecs = 0, inextmicros;
if (! fttime (qdaemon, &isecs, &imicros))
{
fret = FALSE;
break;
}
fcharged = FALSE;
if (q->zlog != NULL)
{
ulog (LOG_NORMAL, "%s", q->zlog);
ubuffree (q->zlog);
q->zlog = NULL;
}
cmax_time = qdaemon->qsys->uuconf_cmax_file_time;
if (qdaemon->cchans <= 1)
cmax_time = 0;
if (cmax_time > 0)
istart = ixsysdep_time (NULL);
/* We can read the file in a tight loop until we have a
command to send, or the file send has been cancelled,
or we have a remote job to deal with, or the maximum
file send time has been exceeded. We can disregard
any changes to qTlocal since we already have
something to send anyhow. */
while (q == qTsend
&& q->fsendfile
&& qTremote == NULL)
{
char *zdata;
size_t cdata;
long ipos;
zdata = (*qdaemon->qproto->pzgetspace) (qdaemon, &cdata);
if (zdata == NULL)
{
fret = FALSE;
break;
}
if (ffileeof (q->e))
cdata = 0;
else
{
cdata = cfileread (q->e, zdata, cdata);
if (ffileioerror (q->e, cdata))
{
/* There is no way to report a file reading
error, so we just drop the connection. */
ulog (LOG_ERROR, "read: %s", strerror (errno));
fret = FALSE;
break;
}
}
ipos = q->ipos;
q->ipos += cdata;
q->cbytes += cdata;
if (! (*qdaemon->qproto->pfsenddata) (qdaemon, zdata,
cdata, q->ilocal,
q->iremote, ipos))
{
fret = FALSE;
break;
}
if (cdata == 0)
{
/* We must update the time now, because this
call may make an entry in the statistics
file. */
inextsecs = ixsysdep_process_time (&inextmicros);
DEBUG_MESSAGE4 (DEBUG_UUCP_PROTO,
"floop: Charging %ld to %c %s %s",
((inextsecs - isecs) * 1000000
+ inextmicros - imicros),
q->s.bcmd, q->s.zfrom, q->s.zto);
q->isecs += inextsecs - isecs;
q->imicros += inextmicros - imicros;
fcharged = TRUE;
q->fsendfile = FALSE;
if (! (*q->psendfn) (q, qdaemon))
fret = FALSE;
break;
}
if (cmax_time > 0
&& q->qnext != q
&& ixsysdep_time (NULL) - istart >= cmax_time)
{
DEBUG_MESSAGE0 (DEBUG_UUCP_PROTO, "floop: Switch file");
utdequeue (q);
utqueue (&qTsend, q, FALSE);
}
}
if (! fret)
break;
if (! fcharged)
{
inextsecs = ixsysdep_process_time (&inextmicros);
DEBUG_MESSAGE4 (DEBUG_UUCP_PROTO,
"floop: Charging %ld to %c %s %s",
((inextsecs - isecs) * 1000000
+ inextmicros - imicros),
q->s.bcmd, q->s.zfrom, q->s.zto);
q->isecs += inextsecs - isecs;
q->imicros += inextmicros - imicros;
}
if (inextsecs - iTchecktime >= CCHECKWAIT)
{
if (! fcheck_queue (qdaemon))
{
fret = FALSE;
break;
}
}
}
}
}
ulog_user ((const char *) NULL);
(void) (*qdaemon->qproto->pfshutdown) (qdaemon);
if (fret)
uwindow_acked (qdaemon, TRUE);
else
ufailed (qdaemon);
return fret;
}
/* This is called by the protocol routines when they have received
some data. If pfexit is not NULL, *pfexit should be set to TRUE if
the protocol receive loop should exit back to the main floop
routine, above. It is only important to set *pfexit to TRUE if the
main loop called the pfwait entry point, so we need never set it to
TRUE if we just receive data for a file. This routine never sets
*pfexit to FALSE. */
boolean
fgot_data (qdaemon, zfirst, cfirst, zsecond, csecond, ilocal, iremote, ipos,
fallacked, pfexit)
struct sdaemon *qdaemon;
const char *zfirst;
size_t cfirst;
const char *zsecond;
size_t csecond;
int ilocal;
int iremote;
long ipos;
boolean fallacked;
boolean *pfexit;
{
struct stransfer *q;
int cwrote;
boolean fret;
long isecs, imicros;
if (fallacked && qTreceive_ack != NULL)
uwindow_acked (qdaemon, TRUE);
/* Now we have to decide which transfer structure gets the data. If
ilocal is -1, it means that the protocol does not know where to
route the data. In that case we route it to the first transfer
that is waiting for data, or, if none, as a new command. If
ilocal is 0, we either select based on the remote channel number
or we have a new command. */
if (ilocal == -1 && qTreceive != NULL)
q = qTreceive;
else if (ilocal == 0 && iremote > 0 && aqTremote[iremote] != NULL)
q = aqTremote[iremote];
else if (ilocal <= 0)
{
const char *znull;
ulog_user ((const char *) NULL);
/* This data is part of a command. If there is no null
character in the data, this string will be continued by the
next packet. Otherwise this must be the last string in the
command, and we don't care about what comes after the null
byte. */
znull = (const char *) memchr (zfirst, '\0', cfirst);
if (znull != NULL)
fret = ftadd_cmd (qdaemon, zfirst, (size_t) (znull - zfirst),
iremote, TRUE);
else
{
fret = ftadd_cmd (qdaemon, zfirst, cfirst, iremote, FALSE);
if (fret && csecond > 0)
{
znull = (const char *) memchr (zsecond, '\0', csecond);
if (znull != NULL)
fret = ftadd_cmd (qdaemon, zsecond,
(size_t) (znull - zsecond), iremote, TRUE);
else
fret = ftadd_cmd (qdaemon, zsecond, csecond, iremote, FALSE);
}
}
if (pfexit != NULL && (qdaemon->fhangup || qTremote != NULL))
*pfexit = TRUE;
/* Time spent waiting for a new command is not charged to
anybody. */
if (! fttime (qdaemon, &iTrecsecs, &iTrecmicros))
fret = FALSE;
return fret;
}
else