d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
cbed30a5cf
freebsd-dev/gnu/libexec/uucp/uucico/send.c
David Greenman 1e8ee278b6 From Johannes Stille: 
When we get an EN8 response while we're already sending the file using
the i protocol, this can happen:

In send.c, flocal_send_await_reply() is called. This function calls
flocal_send_fail() to process the aborted transfer. After this, we run
into the branch that calls ffileseekend() to force the end of the
actual transfer.

Now flocal_send_fail() frees qtrans, but qtrans is still used later!

I propose to fix this by moving the usfree_send(qtrans) out of
flocal_send_fail(), as in the patch I append to this mail.

...

I have found a race condition in the uucp 1.05 code. The typical result
is that the connections mysteriously fails with "conversation failed",
even while all files were transmitted. This is the problem:

At least for the i protocol, the code to send a packet can receive and
process packets after sending.
In several places in the code, we send a command and then prepare to
receive an answer.
Now the answer might already arrive during the call that sends the
command while we aren't ready to process it.

The general solution is IMHO first to do all preparations and only as a
last step to send out the command.

Reviewed by:	John Dyson
Submitted by:	Johannes Stille
1994-11-06 10:17:13 +00:00

1372 lines
40 KiB
C
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* send.c
Routines to send a file.
Copyright (C) 1991, 1992, 1993, 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA.
The author of the program may be contacted at ian@airs.com or
c/o Cygnus Support, Building 200, 1 Kendall Square, Cambridge, MA 02139.
*/
#include "uucp.h"
#if USE_RCS_ID
const char send_rcsid[] = "$Id: send.c,v 1.2 1994/05/07 18:13:57 ache Exp $";
#endif
#include <errno.h>
#include "uudefs.h"
#include "uuconf.h"
#include "system.h"
#include "prot.h"
#include "trans.h"
/* We keep this information in the pinfo field of the stransfer
structure. */
struct ssendinfo
{
/* Local user to send mail to (may be NULL). */
char *zmail;
/* Full file name. */
char *zfile;
/* Number of bytes in file. */
long cbytes;
/* TRUE if this was a local request. */
boolean flocal;
/* TRUE if this is a spool directory file. */
boolean fspool;
/* TRUE if the file has been completely sent. Also used in
flocal_send_cancelled to mean that the file send will never
succeed. */
boolean fsent;
/* Execution file for sending an unsupported E request. */
char *zexec;
};
/* Local functions. */
static void usfree_send P((struct stransfer *qtrans));
static boolean flocal_send_fail P((struct stransfer *qtrans,
struct scmd *qcmd,
struct sdaemon *qdaemon,
const char *zwhy));
static boolean flocal_send_request P((struct stransfer *qtrans,
struct sdaemon *qdaemon));
static boolean flocal_send_await_reply P((struct stransfer *qtrans,
struct sdaemon *qdaemon,
const char *zdata, size_t cdata));
static boolean flocal_send_cancelled P((struct stransfer *qtrans,
struct sdaemon *qdaemon));
static boolean flocal_send_open_file P((struct stransfer *qtrans,
struct sdaemon *qdaemon));
static boolean fremote_rec_fail P((struct sdaemon *qdaemon,
enum tfailure twhy, int iremote));
static boolean fremote_rec_fail_send P((struct stransfer *qtrans,
struct sdaemon *qdaemon));
static boolean fremote_rec_reply P((struct stransfer *qtrans,
struct sdaemon *qdaemon));
static boolean fsend_file_end P((struct stransfer *qtrans,
struct sdaemon *qdaemon));
static boolean fsend_await_confirm P((struct stransfer *qtrans,
struct sdaemon *qdaemon,
const char *zdata, size_t cdata));
static boolean fsend_exec_file_init P((struct stransfer *qtrans,
struct sdaemon *qdaemon));
static void usadd_exec_line P((char **pz, size_t *pcalc, size_t *pclen,
int bcmd, const char *z1, const char *z2));
static boolean fsend_exec_file P((struct stransfer *qtrans,
struct sdaemon *qdaemon));
/* Free up a send stransfer structure. */
static void
usfree_send (qtrans)
struct stransfer *qtrans;
{
struct ssendinfo *qinfo = (struct ssendinfo *) qtrans->pinfo;
if (qinfo != NULL)
{
ubuffree (qinfo->zmail);
ubuffree (qinfo->zfile);
ubuffree (qinfo->zexec);
xfree (qtrans->pinfo);
}
utransfree (qtrans);
}
/* Set up a local request to send a file. This may be called before
we have even tried to call the remote system.
If we are using a traditional protocol, which doesn't support
channel numbers and doesn't permit the file to be sent until an
acknowledgement has been received, the sequence of function calls
looks like this:
flocal_send_file_init --> fqueue_local
flocal_send_request (sends S request) --> fqueue_receive
flocal_send_await_reply (waits for SY) --> fqueue_send
flocal_send_open_file (opens file, calls pffile) --> fqueue_send
send file
fsend_file_end (calls pffile) --> fqueue_receive
fsend_await_confirm (waits for CY)
If flocal_send_await_reply gets an SN, it deletes the request. If
the SY reply contains a file position at which to start sending,
flocal_send_await_reply sets qinfo->ipos.
This gets more complex if the protocol supports channels. In that
case, we want to start sending the file data immediately, to avoid
the round trip delay between flocal_send_request and
flocal_send_await_reply. To do this, flocal_send_request calls
fqueue_send rather than fqueue_receive. The main execution
sequence looks like this:
flocal_send_file_init --> fqueue_local
flocal_send_request (sends S request) --> fqueue_send
flocal_send_open_file (opens file, calls pffile) --> fqueue_send
send file
fsend_file_end (calls pffile) --> fqueue_receive
sometime: flocal_send_await_reply (waits for SY)
fsend_await_confirm (waits for CY)
In this case flocal_send_await_reply must be run before
fsend_await_confirm; it may be run anytime after
flocal_send_request.
If flocal_send_await_reply is called before the entire file has
been sent: if it gets an SN, it sets the file position to the end
and arranges to call flocal_send_cancelled. If it gets a file
position request, it must adjust the file position accordingly.
If flocal_send_await_reply is called after the entire file has been
sent: if it gets an SN, it can simply delete the request. It can
ignore any file position request.
If the request is not deleted, flocal_send_await_reply must arrange
for the next string to be passed to fsend_await_confirm.
Presumably fsend_await_confirm will only be called after the entire
file has been sent.
Just to make things even more complex, these same routines support
sending execution requests, since that is much like sending a file.
For an execution request, the bcmd character will be E rather than
S. If an execution request is being sent to a system which does
not support them, it must be sent as two S requests instead. The
second one will be the execution file, but no actual file is
created; instead the zexec and znext fields in the ssendinfo
structure are used. So if the bcmd character is E, then if the
zexec field is NULL, the data file is being sent, otherwise the
fake execution file is being sent. */
boolean
flocal_send_file_init (qdaemon, qcmd)
struct sdaemon *qdaemon;
struct scmd *qcmd;
{
const struct uuconf_system *qsys;
boolean fspool;
char *zfile;
long cbytes;
struct ssendinfo *qinfo;
struct stransfer *qtrans;
qsys = qdaemon->qsys;
if (qdaemon->fcaller
? ! qsys->uuconf_fcall_transfer
: ! qsys->uuconf_fcalled_transfer)
{
/* uux or uucp should have already made sure that the transfer
is possible, but it might have changed since then. */
if (! qsys->uuconf_fcall_transfer
&& ! qsys->uuconf_fcalled_transfer)
return flocal_send_fail ((struct stransfer *) NULL, qcmd, qdaemon,
"not permitted to transfer files");
/* We can't do the request now, but it may get done later. */
return TRUE;
}
/* The 'C' option means that the file has been copied to the spool
directory. */
if (strchr (qcmd->zoptions, 'C') == NULL
&& ! fspool_file (qcmd->zfrom))
{
fspool = FALSE;
if (! fin_directory_list (qcmd->zfrom,
qsys->uuconf_pzlocal_send,
qsys->uuconf_zpubdir, TRUE,
TRUE, qcmd->zuser))
return flocal_send_fail ((struct stransfer *) NULL, qcmd, qdaemon,
"not permitted to send");
zfile = zbufcpy (qcmd->zfrom);
}
else
{
fspool = TRUE;
zfile = zsysdep_spool_file_name (qsys, qcmd->ztemp, qcmd->pseq);
if (zfile == NULL)
return FALSE;
}
/* Make sure we meet any local size restrictions. The connection
may not have been opened at this point, so we can't check remote
size restrictions. */
cbytes = csysdep_size (zfile);
if (cbytes < 0)
{
ubuffree (zfile);
if (cbytes != -1)
return flocal_send_fail ((struct stransfer *) NULL, qcmd, qdaemon,
"can not get size");
/* A cbytes value of -1 means that the file does not exist.
This can happen legitimately if it has already been sent from
the spool directory. */
if (! fspool)
return flocal_send_fail ((struct stransfer *) NULL, qcmd, qdaemon,
"does not exist");
(void) fsysdep_did_work (qcmd->pseq);
return TRUE;
}
if (qdaemon->clocal_size != -1
&& qdaemon->clocal_size < cbytes)
{
ubuffree (zfile);
if (qdaemon->cmax_ever == -2)
{
long c1, c2;
c1 = cmax_size_ever (qsys->uuconf_qcall_local_size);
c2 = cmax_size_ever (qsys->uuconf_qcalled_local_size);
if (c1 > c2)
qdaemon->cmax_ever = c1;
else
qdaemon->cmax_ever = c2;
}
if (qdaemon->cmax_ever != -1
&& qdaemon->cmax_ever < qcmd->cbytes)
return flocal_send_fail ((struct stransfer *) NULL, qcmd, qdaemon,
"too large to send");
return TRUE;
}
/* We are now prepared to send the command to the remote system. We
queue up a transfer request to send the command when we are
ready. */
qinfo = (struct ssendinfo *) xmalloc (sizeof (struct ssendinfo));
if (strchr (qcmd->zoptions, 'm') == NULL)
qinfo->zmail = NULL;
else
qinfo->zmail = zbufcpy (qcmd->zuser);
qinfo->zfile = zfile;
qinfo->cbytes = cbytes;
qinfo->flocal = strchr (qcmd->zuser, '!') == NULL;
qinfo->fspool = fspool;
qinfo->fsent = FALSE;
qinfo->zexec = NULL;
qtrans = qtransalc (qcmd);
qtrans->psendfn = flocal_send_request;
qtrans->pinfo = (pointer) qinfo;
return fqueue_local (qdaemon, qtrans);
}
/* Clean up after a failing local send request. If zwhy is not NULL,
this reports an error to the log file and to the user. */
static boolean
flocal_send_fail (qtrans, qcmd, qdaemon, zwhy)
struct stransfer *qtrans;
struct scmd *qcmd;
struct sdaemon *qdaemon;
const char *zwhy;
{
if (zwhy != NULL)
{
const char *zfrom;
char *zfree;
const char *ztemp;
if (qcmd->bcmd != 'E')
{
zfrom = qcmd->zfrom;
zfree = NULL;
}
else
{
zfree = zbufalc (strlen (qcmd->zfrom)
+ sizeof " (execution of \"\")"
+ strlen (qcmd->zcmd));
sprintf (zfree, "%s (execution of \"%s\")", qcmd->zfrom,
qcmd->zcmd);
zfrom = zfree;
}
ulog (LOG_ERROR, "%s: %s", zfrom, zwhy);
/* We only save the temporary file if this is a request from the
local system; otherwise a remote system could launch a denial
of service attack by filling up the .Preserve directory
(local users have much simpler methods for this type of
denial of service attack, so there is little point to using a
more sophisticated scheme). */
if (strchr (qcmd->zuser, '!') == NULL)
ztemp = zsysdep_save_temp_file (qcmd->pseq);
else
ztemp = NULL;
(void) fmail_transfer (FALSE, qcmd->zuser, (const char *) NULL,
zwhy, zfrom, (const char *) NULL,
qcmd->zto, qdaemon->qsys->uuconf_zname, ztemp);
ubuffree (zfree);
}
(void) fsysdep_did_work (qcmd->pseq);
return TRUE;
}
/* This is called when we are ready to send the request to the remote
system. We form the request and send it over. If the protocol
does not support multiple channels, we start waiting for the
response; otherwise we can start sending the file immediately. */
static boolean
flocal_send_request (qtrans, qdaemon)
struct stransfer *qtrans;
struct sdaemon *qdaemon;
{
struct ssendinfo *qinfo = (struct ssendinfo *) qtrans->pinfo;
char *zsend;
const char *znotify;
char absize[20];
boolean fret;
/* Make sure the file meets any remote size restrictions. */
if (qdaemon->cmax_receive != -1
&& qdaemon->cmax_receive < qinfo->cbytes)
{
fret = flocal_send_fail (qtrans, &qtrans->s, qdaemon,
"too large for receiver");
usfree_send (qtrans);
return fret;
}
/* Make sure the file still exists--it may have been removed between
the conversation startup and now. After we have sent over the S
command we must give an error if we can't find the file. */
if (! fsysdep_file_exists (qinfo->zfile))
{
(void) fsysdep_did_work (qtrans->s.pseq);
usfree_send (qtrans);
return TRUE;
}
/* If we are using a protocol which can make multiple channels, then
we can open and send the file whenever we are ready. This is
because we will be able to distinguish the response by the
channel it is directed to. This assumes that every protocol
which supports multiple channels also supports sending the file
position in mid-stream, since otherwise we would not be able to
restart files. */
qtrans->fcmd = TRUE;
qtrans->psendfn = flocal_send_open_file;
qtrans->precfn = flocal_send_await_reply;
if (qdaemon->cchans > 1)
fret = fqueue_send (qdaemon, qtrans);
else
fret = fqueue_receive (qdaemon, qtrans);
if (! fret)
return FALSE;
/* Construct the notify string to send. If we are going to send a
size or an execution command, it must be non-empty. */
znotify = qtrans->s.znotify;
if (znotify == NULL)
znotify = "";
if ((qdaemon->ifeatures & FEATURE_SIZES) != 0
|| (qtrans->s.bcmd == 'E'
&& (qdaemon->ifeatures & FEATURE_EXEC) != 0))
{
if (*znotify == '\0')
znotify = "\"\"";
}
else
{
/* We don't need a notify string. Some crufty UUCP code can't
handle a pair of double quotes. */
if (strcmp (znotify, "\"\"") == 0)
znotify = "";
}
/* Construct the size string to send. */
if ((qdaemon->ifeatures & FEATURE_SIZES) == 0
&& (qtrans->s.bcmd != 'E'
|| (qdaemon->ifeatures & FEATURE_EXEC) == 0))
absize[0] = '\0';
else if ((qdaemon->ifeatures & FEATURE_V103) == 0)
sprintf (absize, "0x%lx", (unsigned long) qinfo->cbytes);
else
sprintf (absize, "%ld", qinfo->cbytes);
zsend = zbufalc (strlen (qtrans->s.zfrom) + strlen (qtrans->s.zto)
+ strlen (qtrans->s.zuser) + strlen (qtrans->s.zoptions)
+ strlen (qtrans->s.ztemp) + strlen (znotify)
+ strlen (absize)
+ (qtrans->s.zcmd != NULL ? strlen (qtrans->s.zcmd) : 0)
+ 50);
/* If this an execution request and the other side supports
execution requests, we send an E command. Otherwise we send an S
command. The case of an execution request when we are sending
the fake execution file is handled just like an S request at this
point. */
if (qtrans->s.bcmd == 'E'
&& (qdaemon->ifeatures & FEATURE_EXEC) != 0)
{
/* Send the string
E zfrom zto zuser zoptions ztemp imode znotify size zcmd
to the remote system. We put a '-' in front of the (possibly
empty) options and a '0' in front of the mode. */
sprintf (zsend, "E %s %s %s -%s %s 0%o %s %s %s", qtrans->s.zfrom,
qtrans->s.zto, qtrans->s.zuser, qtrans->s.zoptions,
qtrans->s.ztemp, qtrans->s.imode, znotify, absize,
qtrans->s.zcmd);
}
else
{
const char *zoptions, *zdummy;
/* Send the string
S zfrom zto zuser zoptions ztemp imode znotify
to the remote system. We put a '-' in front of the (possibly
empty) options and a '0' in front of the mode. If size
negotiation is supported, we also send the size; in this case
if znotify is empty we must send it as "". If this is really
an execution request, we have to simplify the options string
to remove the various execution options which may confuse the
remote system. SVR4 expects a string "dummy" between the
notify string and the size; I don't know why. */
if (qtrans->s.bcmd != 'E')
zoptions = qtrans->s.zoptions;
else if (strchr (qtrans->s.zoptions, 'C') != NULL)
{
/* This should set zoptions to "C", but at least one UUCP
program gets confused by it. That means that it will
fail in certain cases, but I suppose we might as well
kowtow to compatibility. This shouldn't matter to any
other program, I hope. */
zoptions = "";
}
else
zoptions = "c";
if ((qdaemon->ifeatures & FEATURE_SVR4) != 0)
zdummy = " dummy ";
else
zdummy = " ";
sprintf (zsend, "S %s %s %s -%s %s 0%o %s%s%s", qtrans->s.zfrom,
qtrans->s.zto, qtrans->s.zuser, zoptions,
qtrans->s.ztemp, qtrans->s.imode, znotify, zdummy,
absize);
}
fret = (*qdaemon->qproto->pfsendcmd) (qdaemon, zsend, qtrans->ilocal,
qtrans->iremote);
ubuffree (zsend);
if (! fret)
usfree_send (qtrans);
return fret;
}
/* This is called when a reply is received for the send request. As
described at length above, if the protocol supports multiple
channels we may be in the middle of sending the file, or we may
even finished sending the file. */
static boolean
flocal_send_await_reply (qtrans, qdaemon, zdata, cdata)
struct stransfer *qtrans;
struct sdaemon *qdaemon;
const char *zdata;
size_t cdata;
{
struct ssendinfo *qinfo = (struct ssendinfo *) qtrans->pinfo;
char bcmd;
if (qtrans->s.bcmd == 'E'
&& (qdaemon->ifeatures & FEATURE_EXEC) != 0)
bcmd = 'E';
else
bcmd = 'S';
if (zdata[0] != bcmd
|| (zdata[1] != 'Y' && zdata[1] != 'N'))
{
ulog (LOG_ERROR, "%s: Bad response to %c request: \"%s\"",
qtrans->s.zfrom, bcmd, zdata);
usfree_send (qtrans);
return FALSE;
}
if (zdata[1] == 'N')
{
const char *zerr;
boolean fnever;
fnever = TRUE;
if (zdata[2] == '2')
zerr = "permission denied by remote";
else if (zdata[2] == '4')
{
zerr = "remote cannot create work files";
fnever = FALSE;
}
else if (zdata[2] == '6')
{
zerr = "too large for remote now";
fnever = FALSE;
}
else if (zdata[2] == '7')
{
/* The file is too large to ever send. */
zerr = "too large for remote";
}
else if (zdata[2] == '8')
{
/* The file was already received by the remote system. This
is not an error, it just means that the ack from the
remote was lost in the previous conversation, and there
is no need to resend the file. */
zerr = NULL;
}
else if (zdata[2] == '9')
{
/* Remote has run out of channels. */
zerr = "too many channels for remote";
fnever = FALSE;
/* Drop one channel; using exactly one channel causes
slightly different behahaviour in a few places, so don't
decrement to one. */
if (qdaemon->cchans > 2)
--qdaemon->cchans;
}
else
zerr = "unknown reason";
if (! fnever
|| (qtrans->s.bcmd == 'E'
&& (qdaemon->ifeatures & FEATURE_EXEC) == 0
&& qinfo->zexec == NULL))
{
if (qtrans->s.bcmd == 'E')
ulog (LOG_ERROR, "%s (execution of \"%s\"): %s",
qtrans->s.zfrom, qtrans->s.zcmd, zerr);
else
ulog (LOG_ERROR, "%s: %s", qtrans->s.zfrom, zerr);
}
else
{
if (! flocal_send_fail ((struct stransfer *) NULL, &qtrans->s,
qdaemon, zerr))
{
usfree_send (qtrans);
return FALSE;
}
}
/* If the protocol does not support multiple channels, we can
simply remove the transaction. Otherwise we must make sure
the remote side knows that we have finished sending the file
data. If we have already sent the entire file, there will be
no confusion. */
if (qdaemon->cchans == 1 || qinfo->fsent)
{
/* If we are breaking a 'E' command into two 'S' commands,
and that was for the first 'S' command, we still have to
send the second one. */
if (fnever
&& qtrans->s.bcmd == 'E'
&& (qdaemon->ifeatures & FEATURE_EXEC) == 0
&& qinfo->zexec == NULL)
return fsend_exec_file_init (qtrans, qdaemon);
usfree_send (qtrans);
return TRUE;
}
else
{
/* Seek to the end of the file so that the next read will
send end of file. We have to be careful here, because we
may have actually already sent end of file--we could be
being called because of data received while the end of
file block was sent. */
if (! ffileseekend (qtrans->e))
{
ulog (LOG_ERROR, "seek to end: %s", strerror (errno));
usfree_send (qtrans);
return FALSE;
}
qtrans->psendfn = flocal_send_cancelled;
qtrans->precfn = NULL;
/* Reuse fsent to pass fnever to flocal_send_cancelled. */
qinfo->fsent = fnever;
return fqueue_send (qdaemon, qtrans);
}
}
/* A number following the SY or EY is the file position to start
sending from. If we are already sending the file, we must set
the position accordingly. */
if (zdata[2] != '\0')
{
long cskip;
cskip = strtol ((char *) (zdata + 2), (char **) NULL, 0);
if (cskip > 0 && qtrans->ipos < cskip)
{
if (qtrans->fsendfile && ! qinfo->fsent)
{
if (! ffileseek (qtrans->e, cskip))
{
ulog (LOG_ERROR, "seek: %s", strerror (errno));
usfree_send (qtrans);
return FALSE;
}
}
qtrans->ipos = cskip;
}
}
/* Now queue up to send the file or to wait for the confirmation.
We already set psendfn at the end of flocal_send_request. If the
protocol supports multiple channels, we have already called
fqueue_send; calling it again would move the request in the
queue, which would make the log file a bit confusing. */
qtrans->precfn = fsend_await_confirm;
if (qinfo->fsent)
return fqueue_receive (qdaemon, qtrans);
else if (qdaemon->cchans <= 1)
return fqueue_send (qdaemon, qtrans);
else
return TRUE;
}
/* Open the file, if any, and prepare to send it. */
static boolean
flocal_send_open_file (qtrans, qdaemon)
struct stransfer *qtrans;
struct sdaemon *qdaemon;
{
struct ssendinfo *qinfo = (struct ssendinfo *) qtrans->pinfo;
const char *zuser;
/* If this is not a fake execution file, open it. */
if (qinfo->zexec == NULL)
{
/* If there is an ! in the user name, this is a remote request
queued up by fremote_xcmd_init. */
zuser = qtrans->s.zuser;
if (strchr (zuser, '!') != NULL)
zuser = NULL;
qtrans->e = esysdep_open_send (qdaemon->qsys, qinfo->zfile,
! qinfo->fspool, zuser);
if (! ffileisopen (qtrans->e))
{
(void) fmail_transfer (FALSE, qtrans->s.zuser,
(const char *) NULL,
"cannot open file",
qtrans->s.zfrom, (const char *) NULL,
qtrans->s.zto,
qdaemon->qsys->uuconf_zname,
(qinfo->flocal
? zsysdep_save_temp_file (qtrans->s.pseq)
: (const char *) NULL));
(void) fsysdep_did_work (qtrans->s.pseq);
usfree_send (qtrans);
/* Unfortunately, there is no way to cancel a file send
after we've already put it in progress. So we have to
return FALSE to drop the connection. */
return FALSE;
}
}
/* If flocal_send_await_reply has received a reply with a file
position, it will have set qtrans->ipos to the position at which
to start. */
if (qtrans->ipos > 0)
{
if (qinfo->zexec != NULL)
{
if (qtrans->ipos > qtrans->cbytes)
qtrans->ipos = qtrans->cbytes;
}
else
{
if (! ffileseek (qtrans->e, qtrans->ipos))
{
ulog (LOG_ERROR, "seek: %s", strerror (errno));
usfree_send (qtrans);
return FALSE;
}
}
}
/* We don't bother to log sending the execution file. */
if (qinfo->zexec == NULL)
{
const char *zsend;
char *zalc;
if (qtrans->s.bcmd != 'E')
{
zsend = qtrans->s.zfrom;
zalc = NULL;
}
else
{
zalc = zbufalc (strlen (qtrans->s.zcmd) + sizeof " ()"
+ strlen (qtrans->s.zfrom));
sprintf (zalc, "%s (%s)", qtrans->s.zcmd, qtrans->s.zfrom);
zsend = zalc;
}
qtrans->zlog = zbufalc (sizeof "Sending ( bytes resume at )"
+ strlen (zsend) + 50);
sprintf (qtrans->zlog, "Sending %s (%ld bytes", zsend, qinfo->cbytes);
if (qtrans->ipos > 0)
sprintf (qtrans->zlog + strlen (qtrans->zlog), " resume at %ld",
qtrans->ipos);
strcat (qtrans->zlog, ")");
ubuffree (zalc);
}
if (qdaemon->qproto->pffile != NULL)
{
boolean fhandled;
if (! (*qdaemon->qproto->pffile) (qdaemon, qtrans, TRUE, TRUE,
qinfo->cbytes - qtrans->ipos,
&fhandled))
{
usfree_send (qtrans);
return FALSE;
}
if (fhandled)
return TRUE;
}
if (qinfo->zexec != NULL)
qtrans->psendfn = fsend_exec_file;
else
{
qtrans->fsendfile = TRUE;
qtrans->psendfn = fsend_file_end;
}
return fqueue_send (qdaemon, qtrans);
}
/* Cancel a file send. This is only called for a protocol which
supports multiple channels. It is needed so that both systems
agree as to when a channel is no longer needed. */
static boolean
flocal_send_cancelled (qtrans, qdaemon)
struct stransfer *qtrans;
struct sdaemon *qdaemon;
{
struct ssendinfo *qinfo = (struct ssendinfo *) qtrans->pinfo;
/* If we are breaking a 'E' command into two 'S' commands, and that
was for the first 'S' command, and the first 'S' command will
never be sent (passed as qinfo->fsent), we still have to send the
second one. */
if (qinfo->fsent
&& qtrans->s.bcmd == 'E'
&& (qdaemon->ifeatures & FEATURE_EXEC) == 0
&& qinfo->zexec == NULL)
return fsend_exec_file_init (qtrans, qdaemon);
usfree_send (qtrans);
return TRUE;
}
/* A remote request to receive a file (meaning that we have to send a
file). The sequence of functions calls is as follows:
fremote_rec_file_init (open file) --> fqueue_remote
fremote_rec_reply (send RY, call pffile) --> fqueue_send
send file
fsend_file_end (calls pffile) --> fqueue_receive
fsend_await_confirm (waits for CY)
*/
boolean
fremote_rec_file_init (qdaemon, qcmd, iremote)
struct sdaemon *qdaemon;
struct scmd *qcmd;
int iremote;
{
const struct uuconf_system *qsys;
char *zfile;
boolean fbadname;
long cbytes;
unsigned int imode;
openfile_t e;
struct ssendinfo *qinfo;
struct stransfer *qtrans;
qsys = qdaemon->qsys;
if (! qsys->uuconf_fsend_request)
{
ulog (LOG_ERROR, "%s: not permitted to send files to remote",
qcmd->zfrom);
return fremote_rec_fail (qdaemon, FAILURE_PERM, iremote);
}
if (fspool_file (qcmd->zfrom))
{
ulog (LOG_ERROR, "%s: not permitted to send", qcmd->zfrom);
return fremote_rec_fail (qdaemon, FAILURE_PERM, iremote);
}
zfile = zsysdep_local_file (qcmd->zfrom, qsys->uuconf_zpubdir, &fbadname);
if (zfile == NULL && fbadname)
{
ulog (LOG_ERROR, "%s: bad local file name", qcmd->zfrom);
return fremote_rec_fail (qdaemon, FAILURE_PERM, iremote);
}
if (zfile != NULL)
{
char *zbased;
zbased = zsysdep_add_base (zfile, qcmd->zto);
ubuffree (zfile);
zfile = zbased;
}
if (zfile == NULL)
return fremote_rec_fail (qdaemon, FAILURE_PERM, iremote);
if (! fin_directory_list (zfile, qsys->uuconf_pzremote_send,
qsys->uuconf_zpubdir, TRUE, TRUE,
(const char *) NULL))
{
ulog (LOG_ERROR, "%s: not permitted to send", zfile);
ubuffree (zfile);
return fremote_rec_fail (qdaemon, FAILURE_PERM, iremote);
}
/* If the file is larger than the amount of space the other side
reported, we can't send it. Should we adjust this check based on
the restart position? */
cbytes = csysdep_size (zfile);
if (cbytes != -1
&& ((qcmd->cbytes != -1 && qcmd->cbytes < cbytes)
|| (qdaemon->cremote_size != -1
&& qdaemon->cremote_size < cbytes)
|| (qdaemon->cmax_receive != -1
&& qdaemon->cmax_receive < cbytes)))
{
ulog (LOG_ERROR, "%s: too large to send", zfile);
ubuffree (zfile);
return fremote_rec_fail (qdaemon, FAILURE_SIZE, iremote);
}
imode = ixsysdep_file_mode (zfile);
e = esysdep_open_send (qsys, zfile, TRUE, (const char *) NULL);
if (! ffileisopen (e))
{
ubuffree (zfile);
return fremote_rec_fail (qdaemon, FAILURE_OPEN, iremote);
}
/* If the remote requested that the file send start from a
particular position, arrange to do so. */
if (qcmd->ipos > 0)
{
if (! ffileseek (e, qcmd->ipos))
{
ulog (LOG_ERROR, "seek: %s", strerror (errno));
ubuffree (zfile);
return FALSE;
}
}
qinfo = (struct ssendinfo *) xmalloc (sizeof (struct ssendinfo));
qinfo->zmail = NULL;
qinfo->zfile = zfile;
qinfo->cbytes = cbytes;
qinfo->flocal = FALSE;
qinfo->fspool = FALSE;
qinfo->fsent = FALSE;
qinfo->zexec = NULL;
qtrans = qtransalc (qcmd);
qtrans->psendfn = fremote_rec_reply;
qtrans->iremote = iremote;
qtrans->pinfo = (pointer) qinfo;
qtrans->e = e;
qtrans->ipos = qcmd->ipos;
qtrans->s.imode = imode;
return fqueue_remote (qdaemon, qtrans);
}
/* Reply to a receive request from the remote system, and prepare to
start sending the file. */
static boolean
fremote_rec_reply (qtrans, qdaemon)
struct stransfer *qtrans;
struct sdaemon *qdaemon;
{
struct ssendinfo *qinfo = (struct ssendinfo *) qtrans->pinfo;
char absend[50];
qtrans->fsendfile = TRUE;
qtrans->psendfn = fsend_file_end;
qtrans->precfn = fsend_await_confirm;
if (! fqueue_send (qdaemon, qtrans))
return FALSE;
/* We send the file size because SVR4 UUCP does. We don't look for
it. We send a trailing M if we want to request a hangup. We
send it both after the mode and at the end of the entire string;
I don't know where programs look for it. */
if (qdaemon->frequest_hangup)
DEBUG_MESSAGE0 (DEBUG_UUCP_PROTO,
"fremote_rec_reply: Requesting remote to transfer control");
sprintf (absend, "RY 0%o%s 0x%lx%s", qtrans->s.imode,
qdaemon->frequest_hangup ? "M" : "",
(unsigned long) qinfo->cbytes,
qdaemon->frequest_hangup ? "M" : "");
if (! (*qdaemon->qproto->pfsendcmd) (qdaemon, absend, qtrans->ilocal,
qtrans->iremote))
{
(void) ffileclose (qtrans->e);
usfree_send (qtrans);
return FALSE;
}
qtrans->zlog = zbufalc (sizeof "Sending ( bytes) "
+ strlen (qtrans->s.zfrom) + 25);
sprintf (qtrans->zlog, "Sending %s (%ld bytes)", qtrans->s.zfrom,
qinfo->cbytes);
if (qdaemon->qproto->pffile != NULL)
{
boolean fhandled;
if (! (*qdaemon->qproto->pffile) (qdaemon, qtrans, TRUE, TRUE,
qinfo->cbytes, &fhandled))
{
usfree_send (qtrans);
return FALSE;
}
}
return TRUE;
}
/* If we can't send a file as requested by the remote system, queue up
a failure reply which will be sent when possible. */
static boolean
fremote_rec_fail (qdaemon, twhy, iremote)
struct sdaemon *qdaemon;
enum tfailure twhy;
int iremote;
{
enum tfailure *ptinfo;
struct stransfer *qtrans;
ptinfo = (enum tfailure *) xmalloc (sizeof (enum tfailure));
*ptinfo = twhy;
qtrans = qtransalc ((struct scmd *) NULL);
qtrans->psendfn = fremote_rec_fail_send;
qtrans->iremote = iremote;
qtrans->pinfo = (pointer) ptinfo;
return fqueue_remote (qdaemon, qtrans);
}
/* Send a failure string for a receive command to the remote system;
this is called when we are ready to reply to the command. */
static boolean
fremote_rec_fail_send (qtrans, qdaemon)
struct stransfer *qtrans;
struct sdaemon *qdaemon;
{
enum tfailure *ptinfo = (enum tfailure *) qtrans->pinfo;
const char *z;
boolean fret;
int ilocal = qtrans->ilocal;
int iremote = qtrans->iremote;
switch (*ptinfo)
{
case FAILURE_PERM:
case FAILURE_OPEN:
z = "RN2";
break;
case FAILURE_SIZE:
z = "RN6";
break;
default:
z = "RN";
break;
}
xfree (qtrans->pinfo);
utransfree (qtrans);
fret = (*qdaemon->qproto->pfsendcmd) (qdaemon, z, ilocal, iremote);
return fret;
}
/* This is called when the main loop has finished sending a file. It
prepares to wait for a response from the remote system. Note that
if this is a local request and the protocol supports multiple
channels, we may not even have received a confirmation of the send
request. */
static boolean
fsend_file_end (qtrans, qdaemon)
struct stransfer *qtrans;
struct sdaemon *qdaemon;
{
struct ssendinfo *qinfo = (struct ssendinfo *) qtrans->pinfo;
if (qdaemon->qproto->pffile != NULL)
{
boolean fhandled;
if (! (*qdaemon->qproto->pffile) (qdaemon, qtrans, FALSE, TRUE,
(long) -1, &fhandled))
{
usfree_send (qtrans);
return FALSE;
}
if (fhandled)
return TRUE;
}
qinfo->fsent = TRUE;
/* qtrans->precfn should have been set by a previous function. */
qtrans->fcmd = TRUE;
return fqueue_receive (qdaemon, qtrans);
}
/* Handle the confirmation string received after sending a file. */
/*ARGSUSED*/
static boolean
fsend_await_confirm (qtrans, qdaemon, zdata, cdata)
struct stransfer *qtrans;
struct sdaemon *qdaemon;
const char *zdata;
size_t cdata;
{
struct ssendinfo *qinfo = (struct ssendinfo *) qtrans->pinfo;
boolean fnever;
const char *zerr;
if (qinfo->zexec == NULL)
(void) ffileclose (qtrans->e);
fnever = FALSE;
if (zdata[0] != 'C'
|| (zdata[1] != 'Y' && zdata[1] != 'N'))
{
zerr = "bad confirmation from remote";
ulog (LOG_ERROR, "%s: %s \"%s\"", qtrans->s.zfrom, zerr, zdata);
}
else if (zdata[1] == 'N')
{
fnever = TRUE;
if (zdata[2] == '5')
{
zerr = "file could not be stored in final location";
ulog (LOG_ERROR, "%s: %s", qtrans->s.zfrom, zerr);
}
else
{
zerr = "file send failed for unknown reason";
ulog (LOG_ERROR, "%s: %s \"%s\"", qtrans->s.zfrom, zerr, zdata);
}
}
else
{
zerr = NULL;
/* If we receive CYM, it means that the other side wants us to
hang up so that they can send us something. The
fhangup_requested field is checked in the main loop. */
if (zdata[2] == 'M' && qdaemon->fmaster)
{
DEBUG_MESSAGE0 (DEBUG_UUCP_PROTO,
"fsend_await_confirm: Remote has requested transfer of control");
qdaemon->fhangup_requested = TRUE;
}
}
ustats (zerr == NULL, qtrans->s.zuser, qdaemon->qsys->uuconf_zname,
TRUE, qtrans->cbytes, qtrans->isecs, qtrans->imicros,
qdaemon->fmaster);
qdaemon->csent += qtrans->cbytes;
if (zerr == NULL)
{
/* If this is an execution request, and the remote system
doesn't support execution requests, we have to set up the
fake execution file and loop around again. */
if (qtrans->s.bcmd == 'E'
&& (qdaemon->ifeatures & FEATURE_EXEC) == 0
&& qinfo->zexec == NULL)
return fsend_exec_file_init (qtrans, qdaemon);
/* Send mail about the transfer if requested. */
if (qinfo->zmail != NULL && *qinfo->zmail != '\0')
(void) fmail_transfer (TRUE, qtrans->s.zuser, qinfo->zmail,
(const char *) NULL,
qtrans->s.zfrom, (const char *) NULL,
qtrans->s.zto, qdaemon->qsys->uuconf_zname,
(const char *) NULL);
if (qtrans->s.pseq != NULL)
(void) fsysdep_did_work (qtrans->s.pseq);
}
else
{
/* If the file send failed, we only try to save the file and
send mail if it was requested locally and it will never
succeed. We send mail to qinfo->zmail if set, otherwise to
qtrans->s.zuser. I hope this is reasonable. */
if (fnever && qinfo->flocal)
{
(void) fmail_transfer (FALSE, qtrans->s.zuser, qinfo->zmail,
zerr, qtrans->s.zfrom, (const char *) NULL,
qtrans->s.zto, qdaemon->qsys->uuconf_zname,
zsysdep_save_temp_file (qtrans->s.pseq));
(void) fsysdep_did_work (qtrans->s.pseq);
}
}
usfree_send (qtrans);
return TRUE;
}
/* Prepare to send an execution file to a system which does not
support execution requests. We build the execution file in memory,
and then call flocal_send_request as though we were sending a real
file. Instead of sending a file, the code in flocal_send_open_file
will arrange to call fsend_exec_file which will send data out of
the buffer we have created. */
static boolean
fsend_exec_file_init (qtrans, qdaemon)
struct stransfer *qtrans;
struct sdaemon *qdaemon;
{
struct ssendinfo *qinfo = (struct ssendinfo *) qtrans->pinfo;
char *zxqtfile;
char abtname[CFILE_NAME_LEN];
char abxname[CFILE_NAME_LEN];
char *z;
size_t calc, clen;
z = NULL;
calc = 0;
clen = 0;
usadd_exec_line (&z, &calc, &clen, 'U', qtrans->s.zuser,
qdaemon->zlocalname);
usadd_exec_line (&z, &calc, &clen, 'F', qtrans->s.zto, "");
usadd_exec_line (&z, &calc, &clen, 'I', qtrans->s.zto, "");
if (strchr (qtrans->s.zoptions, 'N') != NULL)
usadd_exec_line (&z, &calc, &clen, 'N', "", "");
if (strchr (qtrans->s.zoptions, 'Z') != NULL)
usadd_exec_line (&z, &calc, &clen, 'Z', "", "");
if (strchr (qtrans->s.zoptions, 'R') != NULL)
usadd_exec_line (&z, &calc, &clen, 'R', qtrans->s.znotify, "");
if (strchr (qtrans->s.zoptions, 'e') != NULL)
usadd_exec_line (&z, &calc, &clen, 'e', "", "");
usadd_exec_line (&z, &calc, &clen, 'C', qtrans->s.zcmd, "");
qinfo->zexec = z;
qinfo->cbytes = clen;
zxqtfile = zsysdep_data_file_name (qdaemon->qsys, qdaemon->zlocalname,
BDEFAULT_UUX_GRADE, TRUE, abtname,
(char *) NULL, abxname);
if (zxqtfile == NULL)
{
usfree_send (qtrans);
return FALSE;
}
ubuffree (zxqtfile);
ubuffree ((char *) qtrans->s.zfrom);
qtrans->s.zfrom = zbufcpy (abtname);
ubuffree ((char *) qtrans->s.zto);
qtrans->s.zto = zbufcpy (abxname);
ubuffree ((char *) qtrans->s.zoptions);
qtrans->s.zoptions = zbufcpy ("C");
ubuffree ((char *) qtrans->s.ztemp);
qtrans->s.ztemp = zbufcpy (abtname);
qtrans->psendfn = flocal_send_request;
qtrans->precfn = NULL;
qtrans->ipos = 0;
qtrans->cbytes = 0;
qtrans->isecs = 0;
qtrans->imicros = 0;
qinfo->fsent = FALSE;
return fqueue_send (qdaemon, qtrans);
}
/* Add a line to the fake execution file. */
static void
usadd_exec_line (pz, pcalc, pclen, bcmd, z1, z2)
char **pz;
size_t *pcalc;
size_t *pclen;
int bcmd;
const char *z1;
const char *z2;
{
size_t c1, c2;
char *znew;
c1 = strlen (z1);
c2 = strlen (z2);
if (*pclen + c1 + c2 + 4 >= *pcalc)
{
*pcalc += c1 + c2 + 100;
znew = zbufalc (*pcalc);
if (*pclen > 0)
{
memcpy (znew, *pz, *pclen);
ubuffree (*pz);
}
*pz = znew;
}
znew = *pz + *pclen;
*znew++ = bcmd;
if (*z1 != '\0')
{
*znew++ = ' ';
memcpy (znew, z1, c1);
znew += c1;
if (*z2 != '\0')
{
*znew++ = ' ';
memcpy (znew, z2, c2);
znew += c2;
}
}
/* In some bizarre non-Unix case we might have to worry about the
newline here. We don't know how a newline is normally written
out to a file, but whatever is written to a file is what we will
normally transfer. If that is not simply \n then this fake
execution file will not look like other execution files. */
*znew++ = '\n';
*pclen = znew - *pz;
}
/* This routine is called to send the contents of the fake execution
file. Normally file data is sent by the floop routine in trans.c,
but since we don't have an actual file we must do it here. This
routine sends the complete buffer, followed by a zero length
packet, and then calls fsend_file_end. */
static boolean
fsend_exec_file (qtrans, qdaemon)
struct stransfer *qtrans;
struct sdaemon *qdaemon;
{
struct ssendinfo *qinfo = (struct ssendinfo *) qtrans->pinfo;
char *zdata;
size_t cdata;
size_t csend;
zdata = (*qdaemon->qproto->pzgetspace) (qdaemon, &cdata);
if (zdata == NULL)
{
usfree_send (qtrans);
return FALSE;
}
csend = qinfo->cbytes - qtrans->ipos;
if (csend > cdata)
csend = cdata;
memcpy (zdata, qinfo->zexec + qtrans->ipos, csend);
if (! (*qdaemon->qproto->pfsenddata) (qdaemon, zdata, csend,
qtrans->ilocal, qtrans->iremote,
qtrans->ipos))
{
usfree_send (qtrans);
return FALSE;
}
qtrans->cbytes += csend;
qtrans->ipos += csend;
if (csend == 0)
return fsend_file_end (qtrans, qdaemon);
/* Leave the job on the send queue. */
return TRUE;
}
Reference in New Issue View Git Blame Copy Permalink