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ckcfns.c
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ckcfns.c
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#ifndef NOICP
char *fnsv = " Library, 4G(108)";
#endif /* ifndef NOICP */
/* C K C F N S -- System-independent Kermit protocol support functions */
/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (c) 2021, 2022, 2023 Jeffrey H. Johnson <trnsz@pobox.com>
*
* Copyright (c) 1981-2011,
* Trustees of Columbia University in the City of New York.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - 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.
*
* - Neither the name of Columbia University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 COPYRIGHT
* HOLDER OR CONTRIBUTORS 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.
*/
#include "ckcdeb.h" /* Debug formats, typedefs, etc. */
#include "ckcker.h" /* Symbol definitions for Kermit */
#ifdef __linux__
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#endif /* ifdef __linux__ */
#ifndef NULL
#define NULL 0
#endif /* ifndef NULL */
extern int spsiz, spmax, rpsiz, timint;
extern int srvtim, rtimo, npad, ebq;
extern int ebqflg, rpt, rptq, rptflg;
extern int capas, keep, pktnum, prvpkt;
extern int sndtyp, bctr, bctu, fmask;
extern int size, maxsize, spktl, nfils;
extern int stdouf, warn, timef, spsizf;
extern int parity, speed, turn, turnch;
extern int delay, displa, pktlog, tralog;
extern int seslog, xflg, mypadn, tsecs;
extern int deblog, hcflg, binary, savmod;
extern int fncnv, local;
#ifndef NOSERVER
extern int server;
#endif /* ifndef NOSERVER */
extern int cxseen;
extern int czseen, nakstate, rq, rqf;
extern int sq, wslots, urpsiz, rln;
#ifndef NOATTR
extern int atcapr;
extern int atcapu;
#endif /* ifndef NOATTR */
extern int atcapb, lpcapr;
extern int lpcapb, lpcapu, swcapr, swcapb;
extern int swcapu, bsave, bsavef, numerrs;
extern long filcnt, ffc, fsize;
#ifndef NOSTATS
extern long flci, flco, tlci;
extern long tlco, tfc;
#endif /* ifndef NOSTATS */
extern CHAR padch, mypadc, eol, seol;
extern CHAR *srvptr, ctlq, myctlq, sstate;
extern CHAR filnam[], sndpkt[], recpkt[], data[];
extern CHAR srvcmd[], stchr, mystch;
extern char *cmarg, *cmarg2, *hlptxt;
extern char **cmlist, *rdatap;
void spar();
void sipkt();
long zchki();
char *strcpy();
char *rpar();
void errpkt(char *reason);
extern void errpkt();
extern CHAR zinbuffer[], zoutbuffer[];
extern CHAR *zinptr, *zoutptr;
extern int zincnt, zoutcnt;
/*
* Variables local
* to this module
*/
static char *memptr; /* Pointer for memory strings */
static char cmdstr[100]; /* UNIX system command string */
static int sndsrc; /* Flag for where to send from: */
/* -1: name in cmdata, */
/* 0: stdin, */
/* >0: list in cmlist. */
static int n_len; /* Packet encode-ahead length and flag */
/* if < 0, no pre-encoded data. */
static int memstr; /* Flag for input from memory string */
static int first; /* Flag for first char from input */
static CHAR t; /* Current character */
static CHAR next; /* Next character */
/* E N C S T R -- Encode a string from memory. */
/*
* Call this instead of getpkt() if source
* is a string, rather than a file.
*/
void
encstr(s)
char *s;
{
int m;
char *p;
m = memstr;
p = memptr; /* Save these. */
memptr = s; /* Point to the string. */
memstr = 1; /* Flag memory string as source. */
first = 1; /* Initialize character lookahead. */
getpkt(
spsiz - bctu - 3); /* Fill a packet from the string. */
memstr = m; /* Restore memory string flag */
memptr = p; /* and pointer */
first = 1; /* Put this back as we found it. */
}
/*
* Output functions
* passed to 'decode'
*/
int
putsrv(c)
register char c;
{ /* Put character in server command buffer */
*srvptr++ = c;
*srvptr = '\0'; /* Make sure buffer is null-terminated */
return ( 0 );
}
int
puttrm(c)
register char c;
{ /* Output character to console */
conoc(c);
return ( 0 );
}
int
putfil(c)
register char c;
{ /* Output char to file */
if (zchout(
ZOFILE, c & fmask) < 0)
{
czseen = 1; /* If write error... */
debug(F101,
"putfil zchout write error, setting czseen", "", 1);
return ( -1 );
}
return ( 0 );
}
/* D E C O D E -- Kermit packet decoding procedure */
/*
* Call with string to be decoded,
* and an output function. Returns
* 0 on success, -1 on failure
* (e.g. disk full)
*/
int
decode(buf, fn)
register CHAR *buf;
register int (*fn)();
{
register unsigned int a, a7, b8; /* Low order 7 bits, and the 8th bit */
int x = 0;
rpt = 0; /* Initialize repeat count. */
while (( a = *buf++ ) != '\0')
{
if (rptflg) /* Repeat processing? */
{
if (
(unsigned int)a == \
(unsigned int)rptq)
{ /* Yes, got a repeat prefix? */
rpt = xunchar(*buf++); /* Yes, get the repeat count, */
a = *buf++; /* and get the prefixed character. */
}
}
b8 = 0; /* Check high order "8th" bit */
if (ebqflg) /* 8th-bit prefixing? */
{
if (
(unsigned int)a == \
(unsigned int)ebq)
{ /* Yes, got an 8th-bit prefix? */
b8 = 0200; /* Yes, remember this, */
a = *buf++; /* and get the prefixed character. */
}
}
if (
(unsigned int)a == \
(unsigned int)ctlq)
{ /* If control prefix, */
a = *buf++; /* get its operand. */
a7 = a & 0177; /* Only look at low 7 bits. */
if (
( a7 >= 0100 && a7 <= 0137 ) \
|| a7 == '?') /* Uncontrollify, */
{
a = ctl(a); /* if in control range */
}
}
a |= b8; /* Or, in the 8th bit */
if (rpt == 0)
{
rpt = 1; /* If no repeats, then one */
}
#ifdef NLCHAR
if (!binary) /* If in text mode, */
{
if (a == CR)
{
continue; /* discard carriage returns, */
}
if (a == LF)
{
a = NLCHAR; /* convert LF to system's newline. */
}
}
#endif /* ifdef NLCHAR */
if (fn == putfil) /* Speedup via buffering and a macro */
{
for (; rpt > 0; rpt--) /* Output the char RPT times */
{
x = zmchout(a);
if (x < 0) /* zmchout is a macro */
{
debug(F101,
"decode zmchout", "", x);
return ( -1 );
}
ffc++; /* Count the character */
}
}
else /* Not to the file */
{
for (; rpt > 0; rpt--) /* Output the char RPT times */
{
if (( *fn )(a) < 0)
{
return ( -1 ); /* Send to output function. */
}
}
}
}
return ( 0 );
}
/* G E T P K T -- Fill a packet data field */
/*
* Gets characters from the current source -- file or memory string.
* Encodes the data into the packet, filling the packet optimally.
* Set first = 1 when calling for the first time on a given input stream
* (string or file).
*
* Uses global variables:
* t -- current character.
* first -- flag: 1 to start up, 0 for input in progress, -1 for EOF.
* next -- next character.
* data -- the packet data buffer.
* size -- number of characters in the data buffer.
*
* Returns the size as value of the function, and also sets global size,
* and fills (and NULL-terminates) the global data array.
*
* Returns 0 upon EOF.
*
* Rewritten by Paul W. Placeway (PWP) of Ohio State University, March '89.
* Incorporates old getchx() and encode() inline to eliminate function
* calls, uses buffered input for much-improved efficiency, and clears up
* some confusion with line termination (CR+LF vs. LF vs. CR).
*/
int
getpkt(bufmax)
int bufmax;
{ /* Fill one packet buffer */
register CHAR rt = t, rnext = next; /* register shadows of the globals */
register CHAR *dp, *odp, *p1, *p2; /* pointers... */
register int x; /* Loop index. */
register int a7; /* Low 7 bits of character */
static CHAR leftover[6] = {
'\0', '\0', '\0',
'\0', '\0', '\0'
};
if (first == 1) /* If first time thru... */
{
first = 0; /* remember, */
*leftover = '\0'; /* discard interrupted leftovers, */
/* get 1st character of file into t */
if (memstr) /* watching out for null file */
{
if (( rt = *memptr++ ) == '\0') /* end of string ==> EOF. */
{
first = -1;
size = 0;
debug(F100,
"getpkt: empty string", "", 0);
return ( 0 );
}
}
else
{
if (( x = zminchar()) == -1) /* End of file */
{
first = -1;
debug(F100,
"getpkt: empty file", "", 0);
size = 0;
return ( 0 );
}
ffc++; /* Count a file character */
rt = x;
}
rt &= fmask; /* Bytesize mask */
}
else if (( first == -1 ) && \
( *leftover == '\0' )) /* EOF from last time? */
{
return ( size = 0 );
}
dp = data;
for (
p1 = leftover;
( *dp = *p1 ) != '\0';
p1++, dp++) /* Copy leftovers */
{
;
}
*leftover = '\0';
if (first == -1)
{
return ( size = ( dp - data )); /* Handle final leftovers */
}
/*
* Now, fill up the
* rest of the packet.
*/
rpt = 0; /* Clear out old repeat count. */
while (first > -1) /* Until EOF... */
{
if (memstr) /* get next character */
{
if (( rnext = *memptr++ ) == '\0') /* end of string ==> EOF */
{
first = -1; /* Flag eof for next time. */
}
else
{
rnext &= fmask; /* Bytesize mask. */
}
}
else
{
if (( x = zminchar()) == -1) /* End of file */
{
first = -1; /* Flag eof for next time. */
}
else
{
rnext = x & fmask; /* Bytesize mask. */
ffc++; /* Count it */
}
}
odp = dp; /* Remember current position. */
if (rptflg) /* Repeat processing? */
{
if (
#ifdef NLCHAR
/*
* If the next char is really CRLF, then we cannot
* be doing a repeat (unless CR,CR,LF which becomes
* "~ <n-1> CR CR LF", which is OK, but not most
* efficient). The actual conversion from NL to CRLF
* is done after the rptflg if...
*/
( binary || \
( rnext != NLCHAR )) &&
#endif /* ifdef NLCHAR */
rt == rnext && \
( first == 0 )) /* Got a run... */
{
if (++rpt < 94) /* Below max, just count */
{
continue; /* go back and get another */
}
else if (rpt == 94) /* Reached max, must dump */
{
*dp++ = rptq;
*dp++ = tochar(rpt);
rpt = 0;
}
}
else if (rpt == 1) /* Run broken, only 2? */
{
/* ... */ /* XXX(jhj): Now empty */
}
else if (rpt > 1) /* More than two */
{
*dp++ = rptq; /* Insert the repeat prefix */
*dp++ = tochar(++rpt); /* and count. */
rpt = 0; /* Reset repeat counter. */
}
}
#ifdef NLCHAR
if (!binary && ( rt == NLCHAR ))
{
*dp++ = myctlq; /* Put in the encoding directly */
*dp++ = 'M'; /* == ctl(CR) */
if (( dp - data ) <= maxsize)
{
odp = dp; /* check packet bounds */
}
rt = LF;
}
#endif /* ifdef NLCHAR */
a7 = rt & 0177; /* Low 7 bits of character */
if (ebqflg && ( rt & 0200 )) /* Do 8th bit prefix if needed */
{
*dp++ = ebq;
rt = a7;
}
if (( a7 < SP ) || \
( a7 == DEL )) /* Do control prefix if needed */
{
*dp++ = myctlq;
rt = ctl(rt);
}
if (a7 == myctlq) /* Prefix the control prefix */
{
*dp++ = myctlq;
}
if (( rptflg ) && ( a7 == rptq )) /* If it's the repeat prefix, */
{
*dp++ = myctlq; /* Quote if doing repeat counts. */
}
if (( ebqflg ) && ( a7 == ebq )) /* Prefix the 8th bit prefix */
{
*dp++ = myctlq; /* if doing 8th-bit prefixes */
}
*dp++ = rt; /* Finally, insert the character */
if (rpt == 1) /* Exactly two copies? */
{
rpt = 0;
p2 = dp; /* Save current size temporarily */
for (p1 = odp; p1 < p2; p1++) /* copy the old chars over again */
{
*dp++ = *p1;
}
if (( p2 - data ) <= maxsize)
{
odp = p2; /* check packet bounds */
}
}
rt = rnext; /* Next is now current. */
if (( dp - data ) >= bufmax) /* If too big save some for next */
{
size = ( dp - data );
*dp = '\0'; /* mark (current) the end. */
if (( dp - data ) > bufmax) /* if packet is overfull */
{
for (p1 = leftover, p2 = odp;
( *p1 = *p2 ) != '\0';
p1++, p2++)
{
;
}
debug(F111,
"getpkt leftover", leftover, size);
debug(F101,
" osize", "", ( odp - data ));
size = ( odp - data ); /* Return truncated packet. */
*odp = '\0'; /* Mark real end */
}
else /* If the packet is exactly full */
{
debug(F101,
"getpkt exact fit", "", size);
}
t = rt;
next = rnext; /* save for next time */
return ( size );
}
} /* Otherwise, keep filling. */
size = ( dp - data );
*dp = '\0'; /* mark (current) the end. */
debug(F111,
"getpkt eof/eot", data, size); /* Fell thru before full, */
return ( size ); /* Return part filled last pkt */
}
/* C A N N E D -- Check if current file transfer cancelled */
int
canned(buf)
char *buf;
{
if (*buf == 'X')
{
cxseen = 1;
}
if (*buf == 'Z')
{
czseen = 1;
}
debug(F101, "canned: cxseen", "", cxseen);
debug(F101, " czseen", "", czseen);
return (( czseen || cxseen ) ? 1 : 0 );
}
/* R E S E T C -- Reset per-transaction character counters */
#ifndef NOSTATS
void
resetc()
{
flci = flco = 0;
tfc = tlci = tlco = 0; /* Total file chars, line chars in & out */
}
#endif /* ifndef NOSTATS */
/* T I N I T -- Initialize a transaction */
void
tinit()
{
xflg = 0; /* Reset x-packet flag */
rqf = -1; /* Reset 8th-bit-quote request flag */
memstr = 0; /* Reset memory-string flag */
memptr = NULL; /* and pointer */
n_len = -1; /* No encoded-ahead data */
bctu = 1; /* Reset block check type to 1 */
ebq = ebqflg = 0; /* Reset 8th-bit quoting stuff */
if (savmod) /* If global file mode was saved, */
{
binary = 1; /* restore it, */
savmod = 0; /* unsave it. */
}
prvpkt = -1; /* Reset packet number */
pktnum = 0;
numerrs = 0; /* Transmission error counter */
cxseen = czseen = 0; /* Reset interrupt flags */
*filnam = '\0'; /* Clear file name */
*sndpkt = '\0'; /* Clear retransmission buffer */
spktl = 0; /* And its length */
nakstate = 0; /* Say we're not in a NAK'ing state */
#ifndef NOSERVER
if (server) /* If acting as server, */
{
timint = srvtim; /* Use server timeout interval. */
}
#endif /* ifndef NOSERVER */
}
/* R I N I T -- Respond to S or I packet */
void
rinit(d)
char *d;
{
char *tp;
ztime(&tp);
tlog(F110,
"Transaction begins", tp, 0l); /* Make transaction log entry */
if (binary)
{
tlog(F100,
"Global file mode = binary", "", 0l);
}
else
{
tlog(F100,
"Global file mode = text", "", 0l);
}
filcnt = 0; /* Init file counter */
spar(d);
ack1(rpar());
}
/* S I N I T -- Make sure file exists, then send Send-Init packet */
int
sinit()
{
int x;
char *tp;
filcnt = 0;
sndsrc = nfils; /* Where to look for files to send */
ztime(&tp);
tlog(F110,
"Transaction begins", tp, 0l); /* Make transaction log entry */
debug(F101,
"sinit: sndsrc", "", sndsrc);
if (sndsrc < 0) /* Must expand from 'send' command */
{
#ifdef DTILDE
char *tnam, *tilde_expand(); /* May have to expand tildes */
tnam = tilde_expand(cmarg); /* Try to expand tilde. */
if (*tnam != '\0')
{
cmarg = tnam;
}
#endif /* ifdef DTILDE */
nfils = zxpand(cmarg); /* Look up literal name. */
if (nfils < 0)
{
#ifndef NOSERVER
if (server)
{
errpkt(
"Too many files");
}
else
{
#endif /* ifndef NOSERVER */
screen(SCR_EM, 0, 0l,
"Too many files");
#ifndef NOSERVER
}
#endif /* ifndef NOSERVER */
return ( 0 );
}
else if (nfils == 0) /* If none found, */
{
char xname[100]; /* convert the name. */
zrtol(cmarg, xname);
nfils = zxpand(xname); /* Look it up again. */
}
if (nfils < 1) /* If no match, report error. */
{
#ifndef NOSERVER
if (server)
{
errpkt("File not found");
}
else
{
#endif /* ifndef NOSERVER */
screen(SCR_EM, 0, 0l,
"File not found");
#ifndef NOSERVER
}
#endif /* ifndef NOSERVER */
return ( 0 );
}
x = gnfile(); /* Position to first file. */
if (x < 1)
{
#ifndef NOSERVER
if (!server)
{
#endif /* ifndef NOSERVER */
screen(SCR_EM, 0, 0l,
"No readable file to send");
#ifndef NOSERVER
}
else
{
errpkt(
"No readable file to send");
}
#endif /* ifndef NOSERVER */
return ( 0 );
}
}
else if (sndsrc > 0) /* Command line arglist -- */
{
x = gnfile(); /* Get the first file from it. */
if (x < 1)
{
return ( 0 ); /* (if any) */
}
}
else if (sndsrc == 0) /* stdin or memory always exist... */
{
if (( cmarg2 != NULL ) && \
( *cmarg2 ))
{
strcpy(filnam, cmarg2); /* If F packet, "as" name is used */
cmarg2 = ""; /* if provided, */
}
else /* otherwise */
{
strcpy(filnam, "stdin"); /* just use this. */
}
}
#ifdef DEBUG
debug(F101,
"sinit: nfils", "", nfils);
debug(F110,
" filnam", filnam, 0);
debug(F110,
" cmdstr", cmdstr, 0);
#endif /* ifdef DEBUG */
ttflui(); /* Flush input buffer. */
if (!local
#ifndef NOSERVER
&& !server
#endif /* ifndef NOSERVER */
)
{
sleep(delay);
}
sipkt('S'); /* Send the Send-Init packet. */
return ( 1 );
}
void
sipkt(c)
char c;
{ /* Send S or I packet. */
CHAR *rp;
ttflui(); /* Flush pending input. */
rp = rpar(); /* Get parameters. */
spack(c, pktnum, strlen(rp), rp);
}
/* R C V F I L -- Receive a file */
/*
* Incoming filename is in data field of F packet. This
* function decodes it into the srvcmd buffer, substituting
* an alternate "as-name", if one was given. Finally, it
* does any requested transformations (like converting to
* lowercase) then if a file of the same name already exists,
* makes a new unique name.
*/
int
rcvfil(n)
char *n;
{
char xname[100], *xp; /* Buffer for constructing name */
#ifdef DTILDE
char *dirp, *tilde_expand();
#endif /* ifdef DTILDE */
srvptr = srvcmd; /* Decode file name from packet. */
decode(rdatap, putsrv);
if (*srvcmd == '\0') /* Watch out for null F packet. */
{
strcpy(srvcmd, "NONAME");
}
#ifdef DTILDE
dirp = tilde_expand(srvcmd); /* Expand tilde, if any. */
if (*dirp != '\0')
{
strcpy(srvcmd, dirp);
}
#endif /* ifdef DTILDE */
screen(SCR_FN, 0, 0l, srvcmd); /* Put it on screen */
tlog(F110, "Receiving", srvcmd, 0l); /* Transaction log entry */
if (cmarg2 != NULL) /* Check for alternate name */
{
if (*cmarg2 != '\0')
{
strcpy(srvcmd, cmarg2); /* Got one, use it. */
*cmarg2 = '\0';
}
}
xp = xname; /* OK to proceed. */
if (fncnv) /* If desired, */
{
zrtol(srvcmd, xp); /* convert name to local form */
}
else /* otherwise, */
{
strcpy(xname, srvcmd); /* use it literally */
}
if (warn) /* File collision avoidance? */
{
if (zchki(xname) != -1) /* Yes, file exists? */
{
znewn(xname, &xp); /* Yes, make new name. */
strcpy(xname, xp);
debug(F110,
" exists, new name ",
xname, 0);
}
}
debug(F110,
"rcvfil: xname",
xname, 0);
strcpy(n, xname); /* Return pointer to actual name. */
ffc = 0; /* Init file character counter */
filcnt++;
return ( 1 ); /* Always succeeds */
}
/* O P E N A -- Open a file, with attributes */
/*
* This function tries to open a new file to
* put the arriving data in. The filename is
* the one in the srvcmd buffer. If warning
* is on and a file of that name already
* exists, then a unique name is chosen.
*/
int
opena(f, zz)
char *f;
struct zattr *zz;
{
int x;
#ifdef DEBUG
adebu(f, zz); /* Write attributes to debug log */
#endif /* ifdef DEBUG */
if (bsavef) /* If somehow file mode */
{
binary = bsave; /* was saved but not restored, */
bsavef = 0; /* restore it. */
debug(F101,
"opena restoring binary",
"", binary);
}
if (( x = openo(f))) /* Try to open the file. */
{
tlog(F110, " as", f, 0l); /* OK, open, record name. */
if (zz->type.val[0] == 'A') /* Check attributes */
{
bsave = binary; /* Save global file type */
bsavef = 1; /* ( restore it in clsof() ) */
binary = 0;
debug(F100,
"opena attribute A = text",
"", binary);
}
else if \
(zz->type.val[0] == 'B')
{
bsave = binary; /* Save global file type */
bsavef = 1;
binary = 1;
debug(F100,
"opena attribute B = binary",
"", binary);
}
if (binary) /* Log file mode in transaction log */
{
tlog(F100,
" mode: binary", "", 0l);
}
else
{
tlog(F100,
" mode: text", "", 0l);
}
screen(SCR_AN, 0, 0l, f);
#ifndef NOICP
#ifndef NOCONN
intmsg(filcnt);
#endif /* ifndef NOCONN */
#endif /* ifndef NOICP */
}
else /* Did not open file OK. */
{
tlog(F110,
"Failure to open", f, 0l);
screen(SCR_EM, 0, 0l,
"Can't open file");
}
ffc = 0; /* Init file character counter */
return ( x ); /* Pass on return code from openo */
}
/* R E O F -- Receive End Of File */
int
reof(yy)
struct zattr *yy;
{
int x;
#ifndef NODISP
char *p;
char c;
#endif /* ifndef NODISP */
if (cxseen == 0)
{