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ckucon.c
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ckucon.c
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#include "ckcsym.h"
char *connv = "CONNECT Command for UNIX:fork(), 9.0.117, 14 Jul 2011";
/* C K U C O N -- Terminal connection to remote system, for UNIX */
/*
Author: Frank da Cruz <[email protected]>,
Columbia University Academic Information Systems, New York City.
Copyright (C) 1985, 2011,
Trustees of Columbia University in the City of New York.
All rights reserved. See the C-Kermit COPYING.TXT file or the
copyright text in the ckcmai.c module for disclaimer and permissions.
NOTE: This module has been superseded on most platforms by ckucns.c, which
uses select() rather than fork() for multiplexing its i/o. This module
is still needed for platforms that do not support select(), and also for
its X.25 support. Although the two modules share large amounts of code,
their structure is radically different and therefore attempts at merging
them have so far been unsuccessful. (November 1998.)
Special thanks to Eduard Vopicka, Prague University of Economics,
Czech Republic, for valuable contributions to this module in July 1994,
and to Neal P. Murphy of the Motorola Cellular Infrastructure Group in 1996
for rearranging the code to allow operation on the BeBox, yet still work
in regular UNIX.
*/
#include "ckcdeb.h" /* Common things first */
#ifndef NOLOCAL
#ifdef BEOSORBEBOX
static double time_started = 0.0;
#include <kernel/OS.h>
_PROTOTYP( static long concld, (void *) );
#else
_PROTOTYP( static VOID concld, (void) );
#endif /* BEOSORBEBOX */
#ifdef NEXT
#undef NSIG
#include <sys/wait.h> /* For wait() */
#endif /* NEXT */
#include <signal.h> /* Signals */
#ifndef HPUXPRE65
#include <errno.h> /* Error number symbols */
#else
#ifndef ERRNO_INCLUDED
#include <errno.h> /* Error number symbols */
#endif /* ERRNO_INCLUDED */
#endif /* HPUXPRE65 */
#ifdef ZILOG /* Longjumps */
#include <setret.h>
#else
#include <setjmp.h>
#endif /* ZILOG */
#include "ckcsig.h"
/* Kermit-specific includes */
#include "ckcasc.h" /* ASCII characters */
#include "ckcker.h" /* Kermit things */
#include "ckucmd.h" /* For xxesc() prototype */
#include "ckcnet.h" /* Network symbols */
#ifndef NOCSETS
#include "ckcxla.h" /* Character set translation */
#endif /* NOCSETS */
/* Internal function prototypes */
_PROTOTYP( VOID ttflux, (void) );
_PROTOTYP( VOID doesc, (char) );
_PROTOTYP( VOID logchar, (char) );
_PROTOTYP( int hconne, (void) );
#ifndef NOSHOW
_PROTOTYP( VOID shomdm, (void) );
#endif /* NOSHOW */
_PROTOTYP( static int kbget, (void) );
_PROTOTYP( static int pipemsg, (int) );
_PROTOTYP( static int ckcputf, (void) );
_PROTOTYP( static VOID ck_sndmsg, (void) );
/*
For inter-fork signaling. Normally we use SIGUSR1, except on SCO, where
we use SIGUSR2 because SIGUSR1 is used by the system. You can define
CK_FORK_SIG to be whatever other signal you might want to use at compile
time. We don't use SIGUSR2 everywhere because in some systems, like
UnixWare, the default action for SIGUSR2 is to kill the process that gets it.
*/
#ifndef CK_FORK_SIG
#ifndef SIGUSR1 /* User-defined signals */
#define SIGUSR1 30
#endif /* SIGUSR1 */
#ifndef SIGUSR2
#define SIGUSR2 31
#endif /* SIGUSR2 */
#ifdef M_UNIX
#define CK_FORK_SIG SIGUSR2 /* SCO - use SIGUSR2 */
#else
#define CK_FORK_SIG SIGUSR1 /* Others - use SIGUSR1 */
#endif /* M_UNIX */
#endif /* CK_FORK_SIG */
/* External variables */
extern struct ck_p ptab[];
extern int local, escape, duplex, parity, flow, seslog, sessft, debses,
mdmtyp, ttnproto, cmask, cmdmsk, network, nettype, deblog, sosi, tnlm,
xitsta, what, ttyfd, ttpipe, quiet, backgrd, pflag, tt_crd, tt_lfd,
tn_nlm, ttfdflg,
tt_escape, justone, carrier, hwparity;
extern long speed;
extern char ttname[], sesfil[], myhost[], *ccntab[];
#ifdef TNCODE
extern int tn_b_nlm, tn_rem_echo;
#endif /* TNCODE */
#ifdef CK_TRIGGER
extern char * tt_trigger[], * triggerval;
#endif /* CK_TRIGGER */
extern int nopush;
#ifdef CK_APC
extern int apcactive; /* Application Program Command (APC) */
extern int apcstatus; /* items ... */
static int apclength = 0;
#ifdef DCMDBUF
extern char *apcbuf;
#else
extern char apcbuf[];
#endif /* DCMDBUF */
static int apcbuflen = APCBUFLEN - 2;
extern int protocol; /* Auto download */
#endif /* CK_APC */
extern int autodl;
#ifdef CK_AUTODL
extern CHAR ksbuf[];
#endif /* CK_AUTODL */
#ifdef CK_XYZ
#ifdef XYZ_INTERNAL
static int zmdlok = 1; /* Zmodem autodownloads available */
#else
static int zmdlok = 0; /* Depends on external protocol def */
#endif /* XYZ_INTERNAL */
#else
static int zmdlok = 0; /* Not available at all */
#endif /* CK_XYZ */
#ifndef NOSETKEY /* Keyboard mapping */
extern KEY *keymap; /* Single-character key map */
extern MACRO *macrotab; /* Key macro pointer table */
static MACRO kmptr = NULL; /* Pointer to current key macro */
#endif /* NOSETKEY */
/* Global variables local to this module */
static int
quitnow = 0, /* <esc-char>Q was typed */
jbset = 0, /* Flag whether jmp buf is set. */
dohangup = 0, /* <esc-char>H was typed */
sjval, /* Setjump return value */
goterr = 0, /* Fork/pipe creation error flag */
inshift = 0, /* SO/SI shift states */
outshift = 0;
int active = 0; /* Lower fork active flag */
static PID_T parent_id = (PID_T)0; /* Process ID of keyboard fork */
static char ecbuf[10], *ecbp; /* Escape char buffer & pointer */
#ifdef CK_SMALL
#define IBUFL 1536 /* Input buffer length */
#else
#define IBUFL 4096
#endif /* CK_SMALL */
static int obc = 0; /* Output buffer count */
#ifndef OXOS
#define OBUFL 1024 /* Output buffer length */
#else
#define OBUFL IBUFL
#endif /* OXOS */
#ifdef BIGBUFOK
#define TMPLEN 4096 /* Temporary message buffer length */
#else
#define TMPLEN 200
#endif /* BIGBUFOK */
#ifdef DYNAMIC
static char *ibuf = NULL, *obuf = NULL, *temp = NULL; /* Buffers */
#else
static char ibuf[IBUFL], obuf[OBUFL], temp[TMPLEN];
#endif /* DYNAMIC */
#ifdef DYNAMIC
static char *ibp; /* Input buffer pointer */
#else
static char *ibp = ibuf; /* Input buffer pointer */
#endif /*DYNAMIC */
static int ibc = 0; /* Input buffer count */
#ifdef DYNAMIC
static char *obp; /* Output buffer pointer */
#else
static char *obp = obuf; /* Output buffer pointer */
#endif /* DYNAMIC */
/* X.25 items */
#ifdef ANYX25
static char *p; /* General purpose pointer */
char x25ibuf[MAXIX25]; /* Input buffer */
char x25obuf[MAXOX25]; /* Output buffer */
int ibufl; /* Length of input buffer */
int obufl; /* Length of output buffer */
unsigned char tosend = 0;
int linkid, lcn;
static int dox25clr = 0;
#ifndef IBMX25
extern CHAR padparms[];
#endif /* IBMX25 */
#endif /* ANYX25 */
static int xpipe[2] = {-1, -1}; /* Pipe descriptor for child-parent messages */
static PID_T pid = (PID_T) 0; /* Process ID of child */
/* Character-set items */
static int unicode = 0;
static int escseq = 0; /* 1 = Recognizer is active */
int inesc = 0; /* State of sequence recognizer */
int oldesc = -1; /* Previous state of recognizer */
#define OUTXBUFSIZ 15
static CHAR inxbuf[OUTXBUFSIZ+1]; /* Host-to-screen expansion buffer */
static int inxcount = 0; /* and count */
static CHAR outxbuf[OUTXBUFSIZ+1]; /* Keyboard-to-host expansion buf */
static int outxcount = 0; /* and count */
#ifndef NOCSETS
#ifdef CK_ANSIC /* ANSI C prototypes... */
extern CHAR (*xls[MAXTCSETS+1][MAXFCSETS+1])(CHAR); /* Character set */
extern CHAR (*xlr[MAXTCSETS+1][MAXFCSETS+1])(CHAR); /* translation functions */
static CHAR (*sxo)(CHAR); /* Local translation functions */
static CHAR (*rxo)(CHAR); /* for output (sending) terminal chars */
static CHAR (*sxi)(CHAR); /* and for input (receiving) terminal chars. */
static CHAR (*rxi)(CHAR);
#else /* Not ANSI C... */
extern CHAR (*xls[MAXTCSETS+1][MAXFCSETS+1])(); /* Character set */
extern CHAR (*xlr[MAXTCSETS+1][MAXFCSETS+1])(); /* translation functions. */
static CHAR (*sxo)(); /* Local translation functions */
static CHAR (*rxo)(); /* for output (sending) terminal chars */
static CHAR (*sxi)(); /* and for input (receiving) terminal chars. */
static CHAR (*rxi)();
#endif /* CK_ANSIC */
extern int language; /* Current language. */
static int langsv; /* For remembering language setting. */
extern struct csinfo fcsinfo[]; /* File character set info. */
extern int tcsr, tcsl; /* Terminal character sets, remote & local. */
static int tcs; /* Intermediate ("transfer") character set. */
static int tcssize = 0; /* Size of tcs */
#ifdef UNICODE /* UTF-8 support */
#ifdef CK_ANSIC
extern int (*xl_ufc[MAXFCSETS+1])(USHORT); /* Unicode to FCS */
extern USHORT (*xl_fcu[MAXFCSETS+1])(CHAR); /* FCS to Unicode */
extern int (*xuf)(USHORT); /* Translation function UCS to FCS */
extern USHORT (*xfu)(CHAR); /* Translation function FCS to UCS */
#else
extern int (*xl_ufc[MAXFCSETS+1])();
extern USHORT (*xl_fcu[MAXFCSETS+1])();
extern int (*xuf)();
extern USHORT (*xfu)();
#endif /* CK_ANSIC */
#endif /* UNICODE */
#endif /* NOCSETS */
/*
We do not need to parse and recognize escape sequences if we are being built
without character-set support AND without APC support.
*/
#ifdef NOCSETS /* No character sets */
#ifndef CK_APC /* No APC */
#ifndef NOESCSEQ
#define NOESCSEQ /* So no escape sequence recognizer */
#endif /* NOESCSEQ */
#endif /* CK_APC */
#endif /* NOCSETS */
/* Child process events and messages */
#define CEV_NO 0 /* No event */
#define CEV_HUP 1 /* Communications hangup */
#define CEV_PAD 2 /* X.25 - change PAD parameters */
#define CEV_DUP 3 /* Toggle duplex */
#define CEV_APC 4 /* Execute APC */
#ifdef TNCODE
#define CEV_MEBIN 5 /* Change of me_binary */
#define CEV_UBIN 6 /* Change of u_binary */
#endif /* TNCODE */
#define CEV_ADL 7 /* Autodownload */
#define CEV_AUL 8 /* Autoupload */
#define CEV_TRI 9 /* Trigger string */
#ifdef NOESCSEQ
#define chkaes(x) 0
#else
/*
As of edit 178, the CONNECT command skips past ANSI escape sequences to
avoid translating the characters within them. This allows the CONNECT
command to work correctly with a host that uses a 7-bit ISO 646 national
character set, in which characters like '[' would normally be translated
into accented characters, ruining the terminal's interpretation (and
generation) of escape sequences.
As of edit 190, the CONNECT command responds to APC escape sequences
(ESC _ text ESC \) if the user SETs TERMINAL APC ON or UNCHECKED, and the
program was built with CK_APC defined.
Non-ANSI/ISO-compliant escape sequences are not handled.
*/
/* States for the escape-sequence recognizer. */
#define ES_NORMAL 0 /* Normal, not in an escape sequence */
#define ES_GOTESC 1 /* Current character is ESC */
#define ES_ESCSEQ 2 /* Inside an escape sequence */
#define ES_GOTCSI 3 /* Inside a control sequence */
#define ES_STRING 4 /* Inside DCS,OSC,PM, or APC string */
#define ES_TERMIN 5 /* 1st char of string terminator */
/*
ANSI escape sequence handling. Only the 7-bit form is treated, because
translation is not a problem in the 8-bit environment, in which all GL
characters are ASCII and no translation takes place. So we don't check
for the 8-bit single-character versions of CSI, DCS, OSC, APC, or ST.
Here is the ANSI sequence recognizer state table, followed by the code
that implements it.
Definitions:
CAN = Cancel 01/08 Ctrl-X
SUB = Substitute 01/10 Ctrl-Z
DCS = Device Control Sequence 01/11 05/00 ESC P
CSI = Control Sequence Introducer 01/11 05/11 ESC [
ST = String Terminator 01/11 05/12 ESC \
OSC = Operating System Command 01/11 05/13 ESC ]
PM = Privacy Message 01/11 05/14 ESC ^
APC = Application Program Command 01/11 05/15 ESC _
ANSI escape sequence recognizer:
State Input New State ; Commentary
NORMAL (start) ; Start in NORMAL state
(any) CAN NORMAL ; ^X cancels
(any) SUB NORMAL ; ^Z cancels
NORMAL ESC GOTESC ; Begin escape sequence
NORMAL other ; NORMAL control or graphic character
GOTESC ESC ; Start again
GOTESC [ GOTCSI ; CSI
GOTESC P STRING ; DCS introducer, consume through ST
GOTESC ] STRING ; OSC introducer, consume through ST
GOTESC ^ STRING ; PM introducer, consume through ST
GOTESC _ STRING ; APC introducer, consume through ST
GOTESC 0..~ NORMAL ; 03/00 through 17/14 = Final character
GOTESC other ESCSEQ ; Intermediate or ignored control character
ESCSEQ ESC GOTESC ; Start again
ESCSEQ 0..~ NORMAL ; 03/00 through 17/14 = Final character
ESCSEQ other ; Intermediate or ignored control character
GOTCSI ESC GOTESC ; Start again
GOTCSI @..~ NORMAL ; 04/00 through 17/14 = Final character
GOTCSI other ; Intermediate char or ignored control char
STRING ESC TERMIN ; Maybe have ST
STRING other ; Consume all else
TERMIN \ NORMAL ; End of string
TERMIN other STRING ; Still in string
*/
/*
chkaes() -- Check ANSI Escape Sequence.
Call with EACH character in input stream.
Sets global inesc variable according to escape sequence state.
Returns 0 normally, 1 if an APC sequence is to be executed.
*/
int
#ifdef CK_ANSIC
chkaes(char c)
#else
chkaes(c) char c;
#endif /* CK_ANSIC */
/* chkaes */ {
oldesc = inesc; /* Remember previous state */
if (c == CAN || c == SUB) /* CAN and SUB cancel any sequence */
inesc = ES_NORMAL;
else /* Otherwise */
switch (inesc) { /* enter state switcher */
case ES_NORMAL: /* NORMAL state */
if (c == ESC) /* Got an ESC */
inesc = ES_GOTESC; /* Change state to GOTESC */
break; /* Otherwise stay in NORMAL state */
case ES_GOTESC: /* GOTESC state */
if (c == '[') /* Left bracket after ESC is CSI */
inesc = ES_GOTCSI; /* Change to GOTCSI state */
else if (c == 'P' || (c > 0134 && c < 0140)) { /* P, [, ^, or _ */
inesc = ES_STRING; /* Switch to STRING-absorption state */
#ifdef CK_APC
if (c == '_' && pid == 0 && /* APC handled in child only */
(apcstatus & APC_ON)) { /* and only if not disabled. */
debug(F100,"CONNECT APC begin","",0);
apcactive = APC_REMOTE; /* Set APC-Active flag */
apclength = 0; /* and reset APC buffer pointer */
}
#endif /* CK_APC */
} else if (c > 057 && c < 0177) /* Final character '0' thru '~' */
inesc = ES_NORMAL; /* Back to normal */
else if (c != ESC) /* ESC in an escape sequence... */
inesc = ES_ESCSEQ; /* starts a new escape sequence */
break; /* Intermediate or ignored ctrl char */
case ES_ESCSEQ: /* ESCSEQ -- in an escape sequence */
if (c > 057 && c < 0177) /* Final character '0' thru '~' */
inesc = ES_NORMAL; /* Return to NORMAL state. */
else if (c == ESC) /* ESC ... */
inesc = ES_GOTESC; /* starts a new escape sequence */
break; /* Intermediate or ignored ctrl char */
case ES_GOTCSI: /* GOTCSI -- In a control sequence */
if (c > 077 && c < 0177) /* Final character '@' thru '~' */
inesc = ES_NORMAL; /* Return to NORMAL. */
else if (c == ESC) /* ESC ... */
inesc = ES_GOTESC; /* starts over. */
break; /* Intermediate or ignored ctrl char */
case ES_STRING: /* Inside a string */
if (c == ESC) /* ESC may be 1st char of terminator */
inesc = ES_TERMIN; /* Go see. */
#ifdef CK_APC
else if (apcactive && (apclength < apcbuflen)) /* If in APC, */
apcbuf[apclength++] = c; /* deposit this character. */
else { /* Buffer overrun */
apcactive = 0; /* Discard what we got */
apclength = 0; /* and go back to normal */
apcbuf[0] = 0; /* Not pretty, but what else */
inesc = ES_NORMAL; /* can we do? (ST might not come) */
}
#endif /* CK_APC */
break; /* Absorb all other characters. */
case ES_TERMIN: /* May have a string terminator */
if (c == '\\') { /* which must be backslash */
inesc = ES_NORMAL; /* If so, back to NORMAL */
#ifdef CK_APC
if (apcactive) { /* If it was an APC string, */
debug(F101,"CONNECT APC terminated","",c);
apcbuf[apclength] = NUL; /* terminate it and then ... */
return(1);
}
#endif /* CK_APC */
} else { /* Otherwise */
inesc = ES_STRING; /* Back to string absorption. */
#ifdef CK_APC
if (apcactive && (apclength+1 < apcbuflen)) { /* In APC string */
apcbuf[apclength++] = ESC; /* deposit the Esc character */
apcbuf[apclength++] = c; /* and this character too */
}
#endif /* CK_APC */
}
}
return(0);
}
#endif /* NOESCSEQ */
/* Connect state parent/child communication signal handlers */
/* Routines used by the child process */
static int
pipemsg(n) int n; { /* Send message ID to parent */
int code = n & 255;
return(write(xpipe[1], &code, sizeof(code)));
}
/* Environment pointer for CK_FORK_SIG signal handling in child... */
#ifdef CK_POSIX_SIG
static sigjmp_buf sig_env;
#else
static jmp_buf sig_env;
#endif /* CK_POSIX_SIG */
static SIGTYP /* CK_FORK_SIG handling in child ... */
forkint(foo) int foo; {
/* It is important to disable CK_FORK_SIG before longjmp */
signal(CK_FORK_SIG, SIG_IGN); /* Set to ignore CK_FORK_SIG */
debug(F100,"CONNECT forkint - CK_FORK_SIG", "", 0);
/* Force return from ck_sndmsg() */
cklongjmp(sig_env, 1);
/* NOTREACHED */
}
static VOID
ck_sndmsg() { /* Executed by child only ... */
debug(F100,"CONNECT ck_sndmsg, active", "", active);
if (
#ifdef CK_POSIX_SIG
sigsetjmp(sig_env,1)
#else
setjmp(sig_env)
#endif /* CK_POSIX_SIG */
== 0) {
debug(F100,"CONNECT ck_sndmsg signaling parent","",0);
signal(CK_FORK_SIG, forkint); /* Set up signal handler */
kill(parent_id, CK_FORK_SIG); /* Kick the parent */
debug(F100,"ck_sndmsg pausing","",0);
for (;;) pause(); /* Wait for CK_FORK_SIG or SIGKILL */
/* NOTREACHED */
}
/* We come here from forkint() via [sig]cklongjmp(sig_env,1) */
debug(F100,"CONNECT ck_sndmsg is parent - returning", "", 0);
}
/* Routines used by the parent process */
#ifdef CK_POSIX_SIG /* Environment pointer for CONNECT errors */
static sigjmp_buf con_env;
#else
static jmp_buf con_env;
#endif /* CK_POSIX_SIG */
/*
pipeint() handles CK_FORK_SIG signals from the lower (port) fork.
It reads a function code from the pipe that connects the two forks,
then reads additional data from the pipe, then handles it.
*/
static SIGTYP
pipeint(arg) int arg; { /* Dummy argument */
int code, cx, x, i /* , n */ ;
#ifndef NOCCTRAP
extern ckjmpbuf cmjbuf;
#endif /* NOCCTRAP */
/*
IMPORTANT: At this point, the child fork is waiting for CK_FORK_SIG
(eventually for SIGKILL) inside of ck_sndmsg(). So we can't get any
subsequent CK_FORK_SIG from child before we send it CK_FORK_SIG.
*/
signal(CK_FORK_SIG, SIG_IGN); /* Ignore CK_FORK_SIG now */
debug(F101,"CONNECT pipeint arg","",arg);
read(xpipe[0], &code, sizeof(code)); /* Get function code from pipe */
debug(F101,"CONNECT pipeint code","",code);
cx = code & 255; /* 8-bit version of function code */
#ifndef NOCCTRAP
#ifndef NOICP
#define USECCJMPBUF
#endif /* NOICP */
#endif /* NOCCTRAP */
/*
Read info passed back up to us by the lower fork, depending on the function
requested. The same number of items must be read from the pipe in the same
order as the lower fork put them there. Trying to read something that's not
there makes the program hang uninterruptibly. Pay close attention -- notice
how we fall through some of the cases rather than break; that's deliberate.
*/
switch (cx) {
#ifdef CK_TRIGGER
case CEV_TRI: /* Trigger string */
debug(F100,"CONNECT trigger","",0);
read(xpipe[0], (char *)&i, sizeof(i)); /* Trigger index */
debug(F101,"CONNECT trigger index","",i);
makestr(&triggerval,tt_trigger[i]); /* Make a copy of the trigger */
debug(F110,"CONNECT triggerval",triggerval,0);
read(xpipe[0], (char *)&ibc, sizeof(ibc)); /* Copy child's */
debug(F101,"CONNECT trigger ibc (upper)","",ibc); /* input buffer. */
if (ibc > 0) {
read(xpipe[0], (char *)&ibp, sizeof(ibp));
read(xpipe[0], ibp, ibc);
}
/* Fall thru... */
#endif /* CK_TRIGGER */
case CEV_HUP:
/*
The CEV_HUP case is executed when the other side has hung up on us.
In some cases, this happens before we have had a chance to execute the
setjmp(con_env,1) call, and in that case we'd better not take the longjmp!
A good example is when you TELNET to port 13 on the local host; it prints
its asctime() string (26 chars) and then closes the connection.
*/
#ifdef CK_TRIGGER
if (cx == CEV_TRI)
sjval = CEV_TRI; /* Set global variable. */
else
#endif /* CK_TRIGGER */
sjval = CEV_HUP;
if (jbset) { /* jmp_buf is initialized */
cklongjmp(con_env,sjval); /* so do the right thing. */
} else {
int x = 0;
#ifdef USECCJMPBUF
/* jmp_buf not init'd yet a close approximation... */
#ifdef CK_TRIGGER
if (cx == CEV_HUP)
#endif /* CK_TRIGGER */
ttclos(0); /* Close our end of the connection */
if (pid) {
debug(F101,"CONNECT trigger killing pid","",pid);
#ifdef BEOSORBEBOX
{
long ret_val;
x = kill(pid,SIGKILLTHR); /* Kill lower fork */
wait_for_thread (pid, &ret_val);
}
#else
#ifdef Plan9
x = kill(pid, SIGKILL); /* (should always use this really) */
#else
x = kill(pid,9); /* Kill lower fork (history) */
#endif /* Plan9 */
wait((WAIT_T *)0); /* Wait till gone. */
if (x < 0) {
printf("ERROR: Failure to kill pid %ld: %s, errno=%d\n",
(long) pid, ck_errstr(), errno);
debug(F111,"CONNECT error killing stale pid",
ck_errstr(),errno);
}
pid = (PID_T) 0;
#endif /* BEOSORBEBOX */
}
conres(); /* Reset the console. */
if (!quiet) {
printf("\r\n(Back at %s)\r\n",
*myhost ? myhost :
#ifdef UNIX
"local UNIX system"
#else
"local system"
#endif /* UNIX */
);
}
what = W_NOTHING; /* So console modes are set right. */
printf("\r\n"); /* prevent prompt-stomping */
cklongjmp(cmjbuf,0); /* Do what the Ctrl-C handler does */
#else
printf("\r\nLongjump failure - fatal\r\n");
doexit(GOOD_EXIT,-1); /* Better than dumping core... */
#endif /* USECCJMPBUF */
}
#ifdef USECCJMPBUF
#undef USECCJMPBUF
#endif /* USECCJMPBUF */
case CEV_DUP: /* Child sends duplex change */
read(xpipe[0], (char *)&duplex, sizeof(duplex));
debug(F101,"CONNECT pipeint duplex","",duplex);
break;
#ifdef TNCODE
case CEV_MEBIN: /* Child sends me_binary change */
read(xpipe[0],
(char *)&TELOPT_ME(TELOPT_BINARY),
sizeof(TELOPT_ME(TELOPT_BINARY))
);
debug(F101,"CONNECT pipeint me_binary","",TELOPT_ME(TELOPT_BINARY));
break;
case CEV_UBIN: /* Child sends u_binary change */
read(xpipe[0],
(char *)&TELOPT_U(TELOPT_BINARY),
sizeof(TELOPT_U(TELOPT_BINARY))
);
debug(F101,"CONNECT pipeint u_binary","",TELOPT_U(TELOPT_BINARY));
break;
#endif /* TNCODE */
#ifdef CK_APC
case CEV_AUL: /* Autoupload */
justone = 1;
debug(F100,"CONNECT autoupload at parent","",0);
#ifdef CK_AUTODL
case CEV_ADL: /* Autodownload */
apcactive = APC_LOCAL;
if (!justone) debug(F100,"CONNECT autodownload at parent","",0);
/* Copy child's Kermit packet if any */
read(xpipe[0], (char *)&x, sizeof(x));
debug(F101,"CONNECT trigger ibc (upper)","",ibc);
if (x > 0)
read(xpipe[0], (char *)ksbuf, x+1);
#endif /* CK_AUTODL */
case CEV_APC: /* Application Program Command */
read(xpipe[0], (char *)&apclength, sizeof(apclength));
read(xpipe[0], apcbuf, apclength+1); /* Include trailing zero byte */
debug(F111,"CONNECT APC at parent",apcbuf,apclength);
read(xpipe[0], (char *)&ibc, sizeof(ibc)); /* Copy child's */
if (ibc > 0) { /* input buffer. */
read(xpipe[0], (char *)&ibp, sizeof(ibp));
read(xpipe[0], ibp, ibc);
}
obc = 0; obp = obuf; *obuf = NUL; /* Because port fork flushed */
sjval = CEV_APC;
cklongjmp(con_env,sjval);
/* NOTREACHED */
#endif /* CK_APC */
#ifdef SUNX25
case CEV_PAD: /* X.25 PAD parameter change */
debug(F100,"CONNECT pipeint PAD change","",0);
read(xpipe[0],padparms,MAXPADPARMS);
sjval = CEV_PAD; /* Set global variable. */
#ifdef COMMENT /* We might not need to do this... */
cklongjmp(con_env,sjval);
/* NOTREACHED */
#else /* COMMENT */
break;
#endif /* COMMENT */
#endif /* SUNX25 */
}
signal(CK_FORK_SIG, pipeint); /* Set up signal handler */
kill(pid, CK_FORK_SIG); /* Signal the port fork ... */
}
/* C K C P U T C -- C-Kermit CONNECT Put Character to Screen */
/*
Output is buffered to avoid slow screen writes on fast connections.
NOTE: These could (easily?) become macros ...
*/
static int
ckcputf() { /* Dump the output buffer */
int x = 0;
if (obc > 0) /* If we have any characters, */
x = conxo(obc,obuf); /* dump them, */
obp = obuf; /* reset the pointer */
obc = 0; /* and the counter. */
return(x); /* Return conxo's return code */
}
int
ckcputc(c) int c; {
int x;
*obp++ = c & 0xff; /* Deposit the character */
obc++; /* Count it */
if (ibc == 0 || /* If input buffer about empty */
obc == OBUFL) { /* or output buffer full */
debug(F101,"CONNECT CKCPUTC obc","",obc);
x = conxo(obc,obuf); /* dump the buffer, */
obp = obuf; /* reset the pointer */
obc = 0; /* and the counter. */
return(x); /* Return conxo's return code */
} else return(0);
}
/* C K C G E T C -- C-Kermit CONNECT Get Character */
/*
Buffered read from communication device.
Returns the next character, refilling the buffer if necessary.
On error, returns ttinc's return code (see ttinc() description).
Dummy argument for compatible calling conventions with ttinc().
NOTE: We don't have a macro for this because we have to pass
a pointer to this function as an argument to tn_doop().
*/
int
ckcgetc(dummy) int dummy; {
int c, n;
#ifdef CK_SSL
extern int ssl_active_flag, tls_active_flag;
#endif /* CK_SSL */
#ifdef CK_ENCRYPTION
/* No buffering for possibly encrypted connections */
if (network && IS_TELNET() && TELOPT_ME(TELOPT_AUTHENTICATION))
return(ttinc(0));
#endif /* CK_ENCRYPTION */
#ifdef CK_SSL
if (ssl_active_flag || tls_active_flag)
return(ttinc(0));
#endif /* CK_SSL */
#ifdef COMMENT
/* too much */
debug(F101,"CONNECT CKCGETC 1 ibc","",ibc); /* Log */
#endif /* COMMENT */
if (ibc < 1) { /* Need to refill buffer? */
ibc = 0; /* Yes, reset count */
ibp = ibuf; /* and buffer pointer */
/* debug(F100,"CONNECT CKCGETC 1 calling ttinc(0)","",0); */
#ifdef COMMENT
/*
This check is not worth the overhead. Scenario: ttchk() returns 0, so we
fall through to the blocking ttinc(). While in ttinc(), the connection is
lost. But the read() that ttinc() calls does not notice, and never returns.
This happens at least in HP-UX, and can be seen when we turn off the modem.
*/
if (!network && (carrier != CAR_OFF))
if ((n = ttchk()) < 0) /* Make sure connection is not lost */
return(n);
#endif /* COMMENT */
c = ttinc(0); /* Read one character, blocking */
/* debug(F101,"CONNECT CKCGETC 1 ttinc(0)","",c); */
if (c < 0) { /* If error, return error code */
return(c);
} else { /* Otherwise, got one character */
*ibp++ = c; /* Advance buffer pointer */
ibc++; /* and count. */
}
if ((n = ttchk()) > 0) { /* Any more waiting? */
if (n > (IBUFL - ibc)) /* Get them all at once. */
n = IBUFL - ibc; /* Don't overflow buffer */
if ((n = ttxin(n,(CHAR *)ibp)) > 0) {
#ifdef CK_ENCRYPTION
if (TELOPT_U(TELOPT_ENCRYPTION))
ck_tn_decrypt(ibp,n);
#endif /* CK_ENCRYPTION */
ibc += n; /* Advance counter */
}
} else if (n < 0) { /* Error? */
return(n); /* Return the error code */
}
debug(F101,"CONNECT CKCGETC 2 ibc","",ibc); /* Log how many */
ibp = ibuf; /* Point to beginning of buffer */
}
c = *ibp++ & 0xff; /* Get next character from buffer */
ibc--; /* Reduce buffer count */
return(c); /* Return the character */
}
/*
Keyboard handling, buffered for speed, which is needed when C-Kermit is
in CONNECT mode between two other computers that are transferring data.
*/
static char *kbp; /* Keyboard input buffer pointer */
static int kbc; /* Keyboard input buffer count */
#ifdef CK_SMALL /* Keyboard input buffer length */
#define KBUFL 32 /* Small for PDP-11 UNIX */
#else
#define KBUFL 257 /* Regular kernel size for others */
#endif /* CK_SMALL */
#ifdef DYNAMIC
static char *kbuf = NULL;
#else
static char kbuf[KBUFL];
#endif /* DYNAMIC */
/* Macro for reading keystrokes. */
#define CONGKS() (((--kbc)>=0) ? ((int)(*kbp++) & 0377) : kbget())
/*
Note that we call read() directly here, normally a no-no, but in this case
we know it's UNIX and we're only doing what coninc(0) would have done,
except we're reading a block of characters rather than just one. There is,
at present, no conxin() analog to ttxin() for chunk reads, and instituting
one would only add function-call overhead as it would only be a wrapper for
a read() call anyway.
*/
/*
Another note: We stick in this read() till the user types something.
But the other (lower) fork is running too, and on TELNET connections,
it will signal us to indicate echo-change negotiations, and this can
interrupt the read(). Some UNIXes automatically restart the interrupted
system call, others return from it with errno == EINTR.
*/
static int /* Keyboard buffer filler */
kbget() {
#ifdef EINTR
int tries = 10; /* If read() is interrupted, */
int ok = 0;
while (tries-- > 0) { /* try a few times... */
#endif /* EINTR */
if ((kbc = conchk()) < 1) /* How many chars waiting? */
kbc = 1; /* If none or dunno, wait for one. */
else if (kbc > KBUFL) /* If too many, */
kbc = KBUFL; /* only read this many. */
if ((kbc = read(0, kbuf, kbc)) < 1) { /* Now read it/them. */
debug(F101,"CONNECT kbget errno","",errno); /* Got an error. */
#ifdef EINTR
if (errno == EINTR) /* Interrupted system call. */
continue; /* Try again, up to limit. */
else /* Something else. */
#endif /* EINTR */
return(-1); /* Pass along read() error. */
}
#ifdef EINTR
else { ok = 1; break; }
}
if (!ok) return(-1);
#endif /* EINTR */
kbp = kbuf; /* Adjust buffer pointer, */
kbc--; /* count, */
return((int)(*kbp++) & 0377); /* and return first character. */
}
/* C O N C L D -- Interactive terminal connection child function */
static
#ifdef BEOSORBEBOX
long
#else
VOID
#endif /* BEOSORBEBOX */
concld (
#ifdef BEOSORBEBOX
void *bevoid
#endif /* BEOSORBEBOX */
) {
int n; /* General purpose counter */
int i; /* For loops... */
int c = -1; /* c is a character, but must be signed
integer to pass thru -1, which is the
modem disconnection signal, and is
different from the character 0377 */
int prev;
#ifdef TNCODE
int tx; /* tn_doop() return code */
#endif /* TNCODE */
#ifdef CK_TRIGGER
int ix; /* Trigger index */
#endif /* CK_TRIGGER */
#ifndef NOESCSEQ
int apcrc;
#endif /* NOESCSEQ */
#ifdef COMMENT
int conret = 0; /* Return value from conect() */
jbchksum = -1L;
#endif /* COMMENT */
jbset = 0; /* jmp_buf not set yet, don't use it */
debug(F101,"CONNECT concld entry","",CK_FORK_SIG);
/* *** */ /* Inferior reads, prints port input */
if (priv_can()) { /* Cancel all privs */
printf("?setuid error - fatal\n");
doexit(BAD_EXIT,-1);
}
signal(SIGINT, SIG_IGN); /* In case these haven't been */
signal(SIGQUIT, SIG_IGN); /* inherited from above... */
signal(CK_FORK_SIG, SIG_IGN); /* CK_FORK_SIG not expected yet */
inshift = outshift = 0; /* Initial SO/SI shift state. */
{ /* Wait for parent's setup */
int i;
while ((i = read(xpipe[0], &c, 1)) <= 0) {
if (i < 0) {
debug(F101,"CONNECT concld setup error","",i);
debug(F111,"CONNECT concld setup error",ck_errstr(),errno);
pipemsg(CEV_HUP); /* Read error - hangup */
ck_sndmsg(); /* Send and wait to be killed */
/* NOTREACHED */
} /* Restart interrupted read() */
}
}
close(xpipe[0]); xpipe[0] = -1; /* Child - prevent future reads */
#ifdef DEBUG
if (deblog) {
debug(F100,"CONNECT starting port fork","",0);
debug(F101,"CONNECT port fork ibc","",ibc);
debug(F101,"CONNECT port fork obc","",obc);
}
#endif /* DEBUG */
what = W_CONNECT;
while (1) { /* Fresh read, wait for a character. */
#ifdef ANYX25
if (network && (nettype == NET_SX25)) {
bzero(x25ibuf,sizeof(x25ibuf)) ;
if ((ibufl = ttxin(MAXIX25,(CHAR *)x25ibuf)) < 0) {
#ifndef IBMX25
if (ibufl == -2) { /* PAD parms changes */
pipemsg(CEV_PAD);
write(xpipe[1],padparms,MAXPADPARMS);
ck_sndmsg();
} else {
#endif /* IBMX25 */
if (!quiet)
printf("\r\nCommunications disconnect ");
dologend();
pipemsg(CEV_HUP);