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0fd2377dcc
telnetd/telnet/sys_bsd.c
markm 0fd2377dcc Code merge and diff reduce with "base" telnet. This is the "later" 
telnet, so it was treated as the reference code, except where later
commits were made to "base" telnet.


git-svn-id: http://svn0.us-east.freebsd.org/base/head/contrib/telnet@81965 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
2001-08-20 12:28:40 +00:00

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/*
* Copyright (c) 1988, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the 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 REGENTS 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 REGENTS 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.
*/
#ifndef lint
#if 0
static const char sccsid[] = "@(#)sys_bsd.c 8.4 (Berkeley) 5/30/95";
#else
static const char rcsid[] =
"$FreeBSD$";
#endif
#endif /* not lint */
/*
* The following routines try to encapsulate what is system dependent
* (at least between 4.x and dos) which is used in telnet.c.
*/
#include <fcntl.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <signal.h>
#include <errno.h>
#include <arpa/telnet.h>
#include <unistd.h>
#include "ring.h"
#include "fdset.h"
#include "defines.h"
#include "externs.h"
#include "types.h"
#if defined(CRAY) || (defined(USE_TERMIO) && !defined(SYSV_TERMIO))
#define SIG_FUNC_RET void
#else
#define SIG_FUNC_RET int
#endif
#ifdef SIGINFO
extern SIG_FUNC_RET ayt_status();
#endif
int
tout, /* Output file descriptor */
tin, /* Input file descriptor */
net;
#ifndef USE_TERMIO
struct tchars otc = { 0 }, ntc = { 0 };
struct ltchars oltc = { 0 }, nltc = { 0 };
struct sgttyb ottyb = { 0 }, nttyb = { 0 };
int olmode = 0;
# define cfgetispeed(ptr) (ptr)->sg_ispeed
# define cfgetospeed(ptr) (ptr)->sg_ospeed
# define old_tc ottyb
#else /* USE_TERMIO */
struct termio old_tc = { 0 };
extern struct termio new_tc;
# ifndef TCSANOW
# ifdef TCSETS
# define TCSANOW TCSETS
# define TCSADRAIN TCSETSW
# define tcgetattr(f, t) ioctl(f, TCGETS, (char *)t)
# else
# ifdef TCSETA
# define TCSANOW TCSETA
# define TCSADRAIN TCSETAW
# define tcgetattr(f, t) ioctl(f, TCGETA, (char *)t)
# else
# define TCSANOW TIOCSETA
# define TCSADRAIN TIOCSETAW
# define tcgetattr(f, t) ioctl(f, TIOCGETA, (char *)t)
# endif
# endif
# define tcsetattr(f, a, t) ioctl(f, a, (char *)t)
# define cfgetospeed(ptr) ((ptr)->c_cflag&CBAUD)
# ifdef CIBAUD
# define cfgetispeed(ptr) (((ptr)->c_cflag&CIBAUD) >> IBSHIFT)
# else
# define cfgetispeed(ptr) cfgetospeed(ptr)
# endif
# endif /* TCSANOW */
# ifdef sysV88
# define TIOCFLUSH TC_PX_DRAIN
# endif
#endif /* USE_TERMIO */
static fd_set ibits, obits, xbits;
void
init_sys()
{
tout = fileno(stdout);
tin = fileno(stdin);
FD_ZERO(&ibits);
FD_ZERO(&obits);
FD_ZERO(&xbits);
errno = 0;
}
int
TerminalWrite(buf, n)
char *buf;
int n;
{
return write(tout, buf, n);
}
int
TerminalRead(buf, n)
char *buf;
int n;
{
return read(tin, buf, n);
}
/*
*
*/
int
TerminalAutoFlush()
{
#if defined(LNOFLSH)
int flush;
ioctl(0, TIOCLGET, (char *)&flush);
return !(flush&LNOFLSH); /* if LNOFLSH, no autoflush */
#else /* LNOFLSH */
return 1;
#endif /* LNOFLSH */
}
#ifdef KLUDGELINEMODE
extern int kludgelinemode;
#endif
/*
* TerminalSpecialChars()
*
* Look at an input character to see if it is a special character
* and decide what to do.
*
* Output:
*
* 0 Don't add this character.
* 1 Do add this character
*/
extern void xmitAO(), xmitEL(), xmitEC(), intp(), sendbrk();
int
TerminalSpecialChars(c)
int c;
{
if (c == termIntChar) {
intp();
return 0;
} else if (c == termQuitChar) {
#ifdef KLUDGELINEMODE
if (kludgelinemode)
sendbrk();
else
#endif
sendabort();
return 0;
} else if (c == termEofChar) {
if (my_want_state_is_will(TELOPT_LINEMODE)) {
sendeof();
return 0;
}
return 1;
} else if (c == termSuspChar) {
sendsusp();
return(0);
} else if (c == termFlushChar) {
xmitAO(); /* Transmit Abort Output */
return 0;
} else if (!MODE_LOCAL_CHARS(globalmode)) {
if (c == termKillChar) {
xmitEL();
return 0;
} else if (c == termEraseChar) {
xmitEC(); /* Transmit Erase Character */
return 0;
}
}
return 1;
}
/*
* Flush output to the terminal
*/
void
TerminalFlushOutput()
{
#ifdef TIOCFLUSH
(void) ioctl(fileno(stdout), TIOCFLUSH, (char *) 0);
#else
(void) ioctl(fileno(stdout), TCFLSH, (char *) 0);
#endif
}
void
TerminalSaveState()
{
#ifndef USE_TERMIO
ioctl(0, TIOCGETP, (char *)&ottyb);
ioctl(0, TIOCGETC, (char *)&otc);
ioctl(0, TIOCGLTC, (char *)&oltc);
ioctl(0, TIOCLGET, (char *)&olmode);
ntc = otc;
nltc = oltc;
nttyb = ottyb;
#else /* USE_TERMIO */
tcgetattr(0, &old_tc);
new_tc = old_tc;
#ifndef VDISCARD
termFlushChar = CONTROL('O');
#endif
#ifndef VWERASE
termWerasChar = CONTROL('W');
#endif
#ifndef VREPRINT
termRprntChar = CONTROL('R');
#endif
#ifndef VLNEXT
termLiteralNextChar = CONTROL('V');
#endif
#ifndef VSTART
termStartChar = CONTROL('Q');
#endif
#ifndef VSTOP
termStopChar = CONTROL('S');
#endif
#ifndef VSTATUS
termAytChar = CONTROL('T');
#endif
#endif /* USE_TERMIO */
}
cc_t *
tcval(func)
register int func;
{
switch(func) {
case SLC_IP: return(&termIntChar);
case SLC_ABORT: return(&termQuitChar);
case SLC_EOF: return(&termEofChar);
case SLC_EC: return(&termEraseChar);
case SLC_EL: return(&termKillChar);
case SLC_XON: return(&termStartChar);
case SLC_XOFF: return(&termStopChar);
case SLC_FORW1: return(&termForw1Char);
#ifdef USE_TERMIO
case SLC_FORW2: return(&termForw2Char);
# ifdef VDISCARD
case SLC_AO: return(&termFlushChar);
# endif
# ifdef VSUSP
case SLC_SUSP: return(&termSuspChar);
# endif
# ifdef VWERASE
case SLC_EW: return(&termWerasChar);
# endif
# ifdef VREPRINT
case SLC_RP: return(&termRprntChar);
# endif
# ifdef VLNEXT
case SLC_LNEXT: return(&termLiteralNextChar);
# endif
# ifdef VSTATUS
case SLC_AYT: return(&termAytChar);
# endif
#endif
case SLC_SYNCH:
case SLC_BRK:
case SLC_EOR:
default:
return((cc_t *)0);
}
}
void
TerminalDefaultChars()
{
#ifndef USE_TERMIO
ntc = otc;
nltc = oltc;
nttyb.sg_kill = ottyb.sg_kill;
nttyb.sg_erase = ottyb.sg_erase;
#else /* USE_TERMIO */
memcpy(new_tc.c_cc, old_tc.c_cc, sizeof(old_tc.c_cc));
# ifndef VDISCARD
termFlushChar = CONTROL('O');
# endif
# ifndef VWERASE
termWerasChar = CONTROL('W');
# endif
# ifndef VREPRINT
termRprntChar = CONTROL('R');
# endif
# ifndef VLNEXT
termLiteralNextChar = CONTROL('V');
# endif
# ifndef VSTART
termStartChar = CONTROL('Q');
# endif
# ifndef VSTOP
termStopChar = CONTROL('S');
# endif
# ifndef VSTATUS
termAytChar = CONTROL('T');
# endif
#endif /* USE_TERMIO */
}
#ifdef notdef
void
TerminalRestoreState()
{
}
#endif
/*
* TerminalNewMode - set up terminal to a specific mode.
* MODE_ECHO: do local terminal echo
* MODE_FLOW: do local flow control
* MODE_TRAPSIG: do local mapping to TELNET IAC sequences
* MODE_EDIT: do local line editing
*
* Command mode:
* MODE_ECHO|MODE_EDIT|MODE_FLOW|MODE_TRAPSIG
* local echo
* local editing
* local xon/xoff
* local signal mapping
*
* Linemode:
* local/no editing
* Both Linemode and Single Character mode:
* local/remote echo
* local/no xon/xoff
* local/no signal mapping
*/
void
TerminalNewMode(f)
register int f;
{
static int prevmode = 0;
#ifndef USE_TERMIO
struct tchars tc;
struct ltchars ltc;
struct sgttyb sb;
int lmode;
#else /* USE_TERMIO */
struct termio tmp_tc;
#endif /* USE_TERMIO */
int onoff;
int old;
cc_t esc;
globalmode = f&~MODE_FORCE;
if (prevmode == f)
return;
/*
* Write any outstanding data before switching modes
* ttyflush() returns 0 only when there is no more data
* left to write out, it returns -1 if it couldn't do
* anything at all, otherwise it returns 1 + the number
* of characters left to write.
#ifndef USE_TERMIO
* We would really like ask the kernel to wait for the output
* to drain, like we can do with the TCSADRAIN, but we don't have
* that option. The only ioctl that waits for the output to
* drain, TIOCSETP, also flushes the input queue, which is NOT
* what we want (TIOCSETP is like TCSADFLUSH).
#endif
*/
old = ttyflush(SYNCHing|flushout);
if (old < 0 || old > 1) {
#ifdef USE_TERMIO
tcgetattr(tin, &tmp_tc);
#endif /* USE_TERMIO */
do {
/*
* Wait for data to drain, then flush again.
*/
#ifdef USE_TERMIO
tcsetattr(tin, TCSADRAIN, &tmp_tc);
#endif /* USE_TERMIO */
old = ttyflush(SYNCHing|flushout);
} while (old < 0 || old > 1);
}
old = prevmode;
prevmode = f&~MODE_FORCE;
#ifndef USE_TERMIO
sb = nttyb;
tc = ntc;
ltc = nltc;
lmode = olmode;
#else
tmp_tc = new_tc;
#endif
if (f&MODE_ECHO) {
#ifndef USE_TERMIO
sb.sg_flags |= ECHO;
#else
tmp_tc.c_lflag |= ECHO;
tmp_tc.c_oflag |= ONLCR;
if (crlf)
tmp_tc.c_iflag |= ICRNL;
#endif
} else {
#ifndef USE_TERMIO
sb.sg_flags &= ~ECHO;
#else
tmp_tc.c_lflag &= ~ECHO;
tmp_tc.c_oflag &= ~ONLCR;
# ifdef notdef
if (crlf)
tmp_tc.c_iflag &= ~ICRNL;
# endif
#endif
}
if ((f&MODE_FLOW) == 0) {
#ifndef USE_TERMIO
tc.t_startc = _POSIX_VDISABLE;
tc.t_stopc = _POSIX_VDISABLE;
#else
tmp_tc.c_iflag &= ~(IXOFF|IXON); /* Leave the IXANY bit alone */
} else {
if (restartany < 0) {
tmp_tc.c_iflag |= IXOFF|IXON; /* Leave the IXANY bit alone */
} else if (restartany > 0) {
tmp_tc.c_iflag |= IXOFF|IXON|IXANY;
} else {
tmp_tc.c_iflag |= IXOFF|IXON;
tmp_tc.c_iflag &= ~IXANY;
}
#endif
}
if ((f&MODE_TRAPSIG) == 0) {
#ifndef USE_TERMIO
tc.t_intrc = _POSIX_VDISABLE;
tc.t_quitc = _POSIX_VDISABLE;
tc.t_eofc = _POSIX_VDISABLE;
ltc.t_suspc = _POSIX_VDISABLE;
ltc.t_dsuspc = _POSIX_VDISABLE;
#else
tmp_tc.c_lflag &= ~ISIG;
#endif
localchars = 0;
} else {
#ifdef USE_TERMIO
tmp_tc.c_lflag |= ISIG;
#endif
localchars = 1;
}
if (f&MODE_EDIT) {
#ifndef USE_TERMIO
sb.sg_flags &= ~CBREAK;
sb.sg_flags |= CRMOD;
#else
tmp_tc.c_lflag |= ICANON;
#endif
} else {
#ifndef USE_TERMIO
sb.sg_flags |= CBREAK;
if (f&MODE_ECHO)
sb.sg_flags |= CRMOD;
else
sb.sg_flags &= ~CRMOD;
#else
tmp_tc.c_lflag &= ~ICANON;
tmp_tc.c_iflag &= ~ICRNL;
tmp_tc.c_cc[VMIN] = 1;
tmp_tc.c_cc[VTIME] = 0;
#endif
}
if ((f&(MODE_EDIT|MODE_TRAPSIG)) == 0) {
#ifndef USE_TERMIO
ltc.t_lnextc = _POSIX_VDISABLE;
#else
# ifdef VLNEXT
tmp_tc.c_cc[VLNEXT] = (cc_t)(_POSIX_VDISABLE);
# endif
#endif
}
if (f&MODE_SOFT_TAB) {
#ifndef USE_TERMIO
sb.sg_flags |= XTABS;
#else
# ifdef OXTABS
tmp_tc.c_oflag |= OXTABS;
# endif
# ifdef TABDLY
tmp_tc.c_oflag &= ~TABDLY;
tmp_tc.c_oflag |= TAB3;
# endif
#endif
} else {
#ifndef USE_TERMIO
sb.sg_flags &= ~XTABS;
#else
# ifdef OXTABS
tmp_tc.c_oflag &= ~OXTABS;
# endif
# ifdef TABDLY
tmp_tc.c_oflag &= ~TABDLY;
# endif
#endif
}
if (f&MODE_LIT_ECHO) {
#ifndef USE_TERMIO
lmode &= ~LCTLECH;
#else
# ifdef ECHOCTL
tmp_tc.c_lflag &= ~ECHOCTL;
# endif
#endif
} else {
#ifndef USE_TERMIO
lmode |= LCTLECH;
#else
# ifdef ECHOCTL
tmp_tc.c_lflag |= ECHOCTL;
# endif
#endif
}
if (f == -1) {
onoff = 0;
} else {
#ifndef USE_TERMIO
if (f & MODE_OUTBIN)
lmode |= LLITOUT;
else
lmode &= ~LLITOUT;
if (f & MODE_INBIN)
lmode |= LPASS8;
else
lmode &= ~LPASS8;
#else
if (f & MODE_INBIN)
tmp_tc.c_iflag &= ~ISTRIP;
else
tmp_tc.c_iflag |= ISTRIP;
if (f & MODE_OUTBIN) {
tmp_tc.c_cflag &= ~(CSIZE|PARENB);
tmp_tc.c_cflag |= CS8;
tmp_tc.c_oflag &= ~OPOST;
} else {
tmp_tc.c_cflag &= ~(CSIZE|PARENB);
tmp_tc.c_cflag |= old_tc.c_cflag & (CSIZE|PARENB);
tmp_tc.c_oflag |= OPOST;
}
#endif
onoff = 1;
}
if (f != -1) {
#ifdef SIGINT
SIG_FUNC_RET intr();
#endif /* SIGINT */
#ifdef SIGQUIT
SIG_FUNC_RET intr2();
#endif /* SIGQUIT */
#ifdef SIGTSTP
SIG_FUNC_RET susp();
#endif /* SIGTSTP */
#ifdef SIGINFO
SIG_FUNC_RET ayt();
#endif
#ifdef SIGINT
(void) signal(SIGINT, intr);
#endif
#ifdef SIGQUIT
(void) signal(SIGQUIT, intr2);
#endif
#ifdef SIGTSTP
(void) signal(SIGTSTP, susp);
#endif /* SIGTSTP */
#ifdef SIGINFO
(void) signal(SIGINFO, ayt);
#endif
#if defined(USE_TERMIO) && defined(NOKERNINFO)
tmp_tc.c_lflag |= NOKERNINFO;
#endif
/*
* We don't want to process ^Y here. It's just another
* character that we'll pass on to the back end. It has
* to process it because it will be processed when the
* user attempts to read it, not when we send it.
*/
#ifndef USE_TERMIO
ltc.t_dsuspc = _POSIX_VDISABLE;
#else
# ifdef VDSUSP
tmp_tc.c_cc[VDSUSP] = (cc_t)(_POSIX_VDISABLE);
# endif
#endif
#ifdef USE_TERMIO
/*
* If the VEOL character is already set, then use VEOL2,
* otherwise use VEOL.
*/
esc = (rlogin != _POSIX_VDISABLE) ? rlogin : escape;
if ((tmp_tc.c_cc[VEOL] != esc)
# ifdef VEOL2
&& (tmp_tc.c_cc[VEOL2] != esc)
# endif
) {
if (tmp_tc.c_cc[VEOL] == (cc_t)(_POSIX_VDISABLE))
tmp_tc.c_cc[VEOL] = esc;
# ifdef VEOL2
else if (tmp_tc.c_cc[VEOL2] == (cc_t)(_POSIX_VDISABLE))
tmp_tc.c_cc[VEOL2] = esc;
# endif
}
#else
if (tc.t_brkc == (cc_t)(_POSIX_VDISABLE))
tc.t_brkc = esc;
#endif
} else {
#ifdef SIGINFO
SIG_FUNC_RET ayt_status();
(void) signal(SIGINFO, ayt_status);
#endif
#ifdef SIGINT
(void) signal(SIGINT, SIG_DFL);
#endif
#ifdef SIGQUIT
(void) signal(SIGQUIT, SIG_DFL);
#endif
#ifdef SIGTSTP
(void) signal(SIGTSTP, SIG_DFL);
# ifndef SOLARIS
(void) sigsetmask(sigblock(0) & ~(1<<(SIGTSTP-1)));
# else SOLARIS
(void) sigrelse(SIGTSTP);
# endif SOLARIS
#endif /* SIGTSTP */
#ifndef USE_TERMIO
ltc = oltc;
tc = otc;
sb = ottyb;
lmode = olmode;
#else
tmp_tc = old_tc;
#endif
}
#ifndef USE_TERMIO
ioctl(tin, TIOCLSET, (char *)&lmode);
ioctl(tin, TIOCSLTC, (char *)&ltc);
ioctl(tin, TIOCSETC, (char *)&tc);
ioctl(tin, TIOCSETN, (char *)&sb);
#else
if (tcsetattr(tin, TCSADRAIN, &tmp_tc) < 0)
tcsetattr(tin, TCSANOW, &tmp_tc);
#endif
#if (!defined(TN3270)) || ((!defined(NOT43)) || defined(PUTCHAR))
# if !defined(sysV88)
ioctl(tin, FIONBIO, (char *)&onoff);
ioctl(tout, FIONBIO, (char *)&onoff);
# endif
#endif /* (!defined(TN3270)) || ((!defined(NOT43)) || defined(PUTCHAR)) */
#if defined(TN3270)
if (noasynchtty == 0) {
ioctl(tin, FIOASYNC, (char *)&onoff);
}
#endif /* defined(TN3270) */
}
/*
* Try to guess whether speeds are "encoded" (4.2BSD) or just numeric (4.4BSD).
*/
#if B4800 != 4800
#define DECODE_BAUD
#endif
#ifdef DECODE_BAUD
#ifndef B7200
#define B7200 B4800
#endif
#ifndef B14400
#define B14400 B9600
#endif
#ifndef B19200
# define B19200 B14400
#endif
#ifndef B28800
#define B28800 B19200
#endif
#ifndef B38400
# define B38400 B28800
#endif
#ifndef B57600
#define B57600 B38400
#endif
#ifndef B76800
#define B76800 B57600
#endif
#ifndef B115200
#define B115200 B76800
#endif
#ifndef B230400
#define B230400 B115200
#endif
/*
* This code assumes that the values B0, B50, B75...
* are in ascending order. They do not have to be
* contiguous.
*/
struct termspeeds {
long speed;
long value;
} termspeeds[] = {
{ 0, B0 }, { 50, B50 }, { 75, B75 },
{ 110, B110 }, { 134, B134 }, { 150, B150 },
{ 200, B200 }, { 300, B300 }, { 600, B600 },
{ 1200, B1200 }, { 1800, B1800 }, { 2400, B2400 },
{ 4800, B4800 }, { 7200, B7200 }, { 9600, B9600 },
{ 14400, B14400 }, { 19200, B19200 }, { 28800, B28800 },
{ 38400, B38400 }, { 57600, B57600 }, { 115200, B115200 },
{ 230400, B230400 }, { -1, B230400 }
};
#endif /* DECODE_BAUD */
void
TerminalSpeeds(ispeed, ospeed)
long *ispeed;
long *ospeed;
{
#ifdef DECODE_BAUD
register struct termspeeds *tp;
#endif /* DECODE_BAUD */
register long in, out;
out = cfgetospeed(&old_tc);
in = cfgetispeed(&old_tc);
if (in == 0)
in = out;
#ifdef DECODE_BAUD
tp = termspeeds;
while ((tp->speed != -1) && (tp->value < in))
tp++;
*ispeed = tp->speed;
tp = termspeeds;
while ((tp->speed != -1) && (tp->value < out))
tp++;
*ospeed = tp->speed;
#else /* DECODE_BAUD */
*ispeed = in;
*ospeed = out;
#endif /* DECODE_BAUD */
}
int
TerminalWindowSize(rows, cols)
long *rows, *cols;
{
#ifdef TIOCGWINSZ
struct winsize ws;
if (ioctl(fileno(stdin), TIOCGWINSZ, (char *)&ws) >= 0) {
*rows = ws.ws_row;
*cols = ws.ws_col;
return 1;
}
#endif /* TIOCGWINSZ */
return 0;
}
int
NetClose(fd)
int fd;
{
return close(fd);
}
void
NetNonblockingIO(fd, onoff)
int fd;
int onoff;
{
ioctl(fd, FIONBIO, (char *)&onoff);
}
#if defined(TN3270)
void
NetSigIO(fd, onoff)
int fd;
int onoff;
{
ioctl(fd, FIOASYNC, (char *)&onoff); /* hear about input */
}
void
NetSetPgrp(fd)
int fd;
{
int myPid;
myPid = getpid();
fcntl(fd, F_SETOWN, myPid);
}
#endif /*defined(TN3270)*/
/*
* Various signal handling routines.
*/
/* ARGSUSED */
SIG_FUNC_RET
deadpeer(sig)
int sig;
{
setcommandmode();
longjmp(peerdied, -1);
}
/* ARGSUSED */
SIG_FUNC_RET
intr(sig)
int sig;
{
if (localchars) {
intp();
return;
}
setcommandmode();
longjmp(toplevel, -1);
}
/* ARGSUSED */
SIG_FUNC_RET
intr2(sig)
int sig;
{
if (localchars) {
#ifdef KLUDGELINEMODE
if (kludgelinemode)
sendbrk();
else
#endif
sendabort();
return;
}
}
#ifdef SIGTSTP
/* ARGSUSED */
SIG_FUNC_RET
susp(sig)
int sig;
{
if ((rlogin != _POSIX_VDISABLE) && rlogin_susp())
return;
if (localchars)
sendsusp();
}
#endif
#ifdef SIGWINCH
/* ARGSUSED */
SIG_FUNC_RET
sendwin(sig)
int sig;
{
if (connected) {
sendnaws();
}
}
#endif
#ifdef SIGINFO
/* ARGSUSED */
SIG_FUNC_RET
ayt(sig)
int sig;
{
if (connected)
sendayt();
else
ayt_status();
}
#endif
void
sys_telnet_init()
{
(void) signal(SIGINT, intr);
(void) signal(SIGQUIT, intr2);
(void) signal(SIGPIPE, deadpeer);
#ifdef SIGWINCH
(void) signal(SIGWINCH, sendwin);
#endif
#ifdef SIGTSTP
(void) signal(SIGTSTP, susp);
#endif
#ifdef SIGINFO
(void) signal(SIGINFO, ayt);
#endif
setconnmode(0);
NetNonblockingIO(net, 1);
#if defined(TN3270)
if (noasynchnet == 0) { /* DBX can't handle! */
NetSigIO(net, 1);
NetSetPgrp(net);
}
#endif /* defined(TN3270) */
#if defined(SO_OOBINLINE)
if (SetSockOpt(net, SOL_SOCKET, SO_OOBINLINE, 1) == -1) {
perror("SetSockOpt");
}
#endif /* defined(SO_OOBINLINE) */
}
/*
* Process rings -
*
* This routine tries to fill up/empty our various rings.
*
* The parameter specifies whether this is a poll operation,
* or a block-until-something-happens operation.
*
* The return value is 1 if something happened, 0 if not.
*/
int
process_rings(netin, netout, netex, ttyin, ttyout, poll)
int poll; /* If 0, then block until something to do */
{
register int c;
/* One wants to be a bit careful about setting returnValue
* to one, since a one implies we did some useful work,
* and therefore probably won't be called to block next
* time (TN3270 mode only).
*/
int returnValue = 0;
static struct timeval TimeValue = { 0 };
if (netout) {
FD_SET(net, &obits);
}
if (ttyout) {
FD_SET(tout, &obits);
}
#if defined(TN3270)
if (ttyin) {
FD_SET(tin, &ibits);
}
#else /* defined(TN3270) */
if (ttyin) {
FD_SET(tin, &ibits);
}
#endif /* defined(TN3270) */
#if defined(TN3270)
if (netin) {
FD_SET(net, &ibits);
}
# else /* !defined(TN3270) */
if (netin) {
FD_SET(net, &ibits);
}
# endif /* !defined(TN3270) */
if (netex) {
FD_SET(net, &xbits);
}
if ((c = select(16, &ibits, &obits, &xbits,
(poll == 0)? (struct timeval *)0 : &TimeValue)) < 0) {
if (c == -1) {
/*
* we can get EINTR if we are in line mode,
* and the user does an escape (TSTP), or
* some other signal generator.
*/
if (errno == EINTR) {
return 0;
}
# if defined(TN3270)
/*
* we can get EBADF if we were in transparent
* mode, and the transcom process died.
*/
if (errno == EBADF) {
/*
* zero the bits (even though kernel does it)
* to make sure we are selecting on the right
* ones.
*/
FD_ZERO(&ibits);
FD_ZERO(&obits);
FD_ZERO(&xbits);
return 0;
}
# endif /* defined(TN3270) */
/* I don't like this, does it ever happen? */
printf("sleep(5) from telnet, after select: %s\r\n", strerror(errno));
sleep(5);
}
return 0;
}
/*
* Any urgent data?
*/
if (FD_ISSET(net, &xbits)) {
FD_CLR(net, &xbits);
SYNCHing = 1;
(void) ttyflush(1); /* flush already enqueued data */
}
/*
* Something to read from the network...
*/
if (FD_ISSET(net, &ibits)) {
int canread;
FD_CLR(net, &ibits);
canread = ring_empty_consecutive(&netiring);
#if !defined(SO_OOBINLINE)
/*
* In 4.2 (and some early 4.3) systems, the
* OOB indication and data handling in the kernel
* is such that if two separate TCP Urgent requests
* come in, one byte of TCP data will be overlaid.
* This is fatal for Telnet, but we try to live
* with it.
*
* In addition, in 4.2 (and...), a special protocol
* is needed to pick up the TCP Urgent data in
* the correct sequence.
*
* What we do is: if we think we are in urgent
* mode, we look to see if we are "at the mark".
* If we are, we do an OOB receive. If we run
* this twice, we will do the OOB receive twice,
* but the second will fail, since the second
* time we were "at the mark", but there wasn't
* any data there (the kernel doesn't reset
* "at the mark" until we do a normal read).
* Once we've read the OOB data, we go ahead
* and do normal reads.
*
* There is also another problem, which is that
* since the OOB byte we read doesn't put us
* out of OOB state, and since that byte is most
* likely the TELNET DM (data mark), we would
* stay in the TELNET SYNCH (SYNCHing) state.
* So, clocks to the rescue. If we've "just"
* received a DM, then we test for the
* presence of OOB data when the receive OOB
* fails (and AFTER we did the normal mode read
* to clear "at the mark").
*/
if (SYNCHing) {
int atmark;
static int bogus_oob = 0, first = 1;
ioctl(net, SIOCATMARK, (char *)&atmark);
if (atmark) {
c = recv(net, netiring.supply, canread, MSG_OOB);
if ((c == -1) && (errno == EINVAL)) {
c = recv(net, netiring.supply, canread, 0);
if (clocks.didnetreceive < clocks.gotDM) {
SYNCHing = stilloob(net);
}
} else if (first && c > 0) {
/*
* Bogosity check. Systems based on 4.2BSD
* do not return an error if you do a second
* recv(MSG_OOB). So, we do one. If it
* succeeds and returns exactly the same
* data, then assume that we are running
* on a broken system and set the bogus_oob
* flag. (If the data was different, then
* we probably got some valid new data, so
* increment the count...)
*/
int i;
i = recv(net, netiring.supply + c, canread - c, MSG_OOB);
if (i == c &&
memcmp(netiring.supply, netiring.supply + c, i) == 0) {
bogus_oob = 1;
first = 0;
} else if (i < 0) {
bogus_oob = 0;
first = 0;
} else
c += i;
}
if (bogus_oob && c > 0) {
int i;
/*
* Bogosity. We have to do the read
* to clear the atmark to get out of
* an infinate loop.
*/
i = read(net, netiring.supply + c, canread - c);
if (i > 0)
c += i;
}
} else {
c = recv(net, netiring.supply, canread, 0);
}
} else {
c = recv(net, netiring.supply, canread, 0);
}
settimer(didnetreceive);
#else /* !defined(SO_OOBINLINE) */
c = recv(net, (char *)netiring.supply, canread, 0);
#endif /* !defined(SO_OOBINLINE) */
if (c < 0 && errno == EWOULDBLOCK) {
c = 0;
} else if (c <= 0) {
return -1;
}
if (netdata) {
Dump('<', netiring.supply, c);
}
if (c)
ring_supplied(&netiring, c);
returnValue = 1;
}
/*
* Something to read from the tty...
*/
if (FD_ISSET(tin, &ibits)) {
FD_CLR(tin, &ibits);
c = TerminalRead(ttyiring.supply, ring_empty_consecutive(&ttyiring));
if (c < 0 && errno == EIO)
c = 0;
if (c < 0 && errno == EWOULDBLOCK) {
c = 0;
} else {
/* EOF detection for line mode!!!! */
if ((c == 0) && MODE_LOCAL_CHARS(globalmode) && isatty(tin)) {
/* must be an EOF... */
*ttyiring.supply = termEofChar;
c = 1;
}
if (c <= 0) {
return -1;
}
if (termdata) {
Dump('<', ttyiring.supply, c);
}
ring_supplied(&ttyiring, c);
}
returnValue = 1; /* did something useful */
}
if (FD_ISSET(net, &obits)) {
FD_CLR(net, &obits);
returnValue |= netflush();
}
if (FD_ISSET(tout, &obits)) {
FD_CLR(tout, &obits);
returnValue |= (ttyflush(SYNCHing|flushout) > 0);
}
return returnValue;
}
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