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telnetd/telnet/sys_bsd.c
markm b4c79417a1 From the requestor: 
"Could you do me a favor and fix sys_bsd.c to get the howmany() macro
from <sys/param.h>, instead of <sys/types.h>?  This will save me from
having to worry about the unsync'd bits before making the change."

Requested by:	mike


git-svn-id: http://svn0.us-east.freebsd.org/base/head/contrib/telnet@103954 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
2002-09-25 07:24:01 +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.
*/
#include <sys/cdefs.h>
#include <stdlib.h>
#include <err.h>
__FBSDID("$FreeBSD$");
#ifndef lint
static const char sccsid[] = "@(#)sys_bsd.c 8.4 (Berkeley) 5/30/95";
#endif
/*
* The following routines try to encapsulate what is system dependent
* (at least between 4.x and dos) which is used in telnet.c.
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
#include <arpa/telnet.h>
#include "ring.h"
#include "fdset.h"
#include "defines.h"
#include "externs.h"
#include "types.h"
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, 0, 0, 0, {}, 0, 0 };
# 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 *ibitsp, *obitsp, *xbitsp;
int fdsn;
#ifdef SIGINT
static SIG_FUNC_RET intr(int);
#endif /* SIGINT */
#ifdef SIGQUIT
static SIG_FUNC_RET intr2(int);
#endif /* SIGQUIT */
#ifdef SIGTSTP
static SIG_FUNC_RET susp(int);
#endif /* SIGTSTP */
#ifdef SIGINFO
static SIG_FUNC_RET ayt(int);
#endif
void
init_sys(void)
{
tout = fileno(stdout);
tin = fileno(stdin);
errno = 0;
}
int
TerminalWrite(char *buf, int n)
{
return write(tout, buf, n);
}
int
TerminalRead(char *buf, int n)
{
return read(tin, buf, n);
}
/*
*
*/
int
TerminalAutoFlush(void)
{
#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
*/
int
TerminalSpecialChars(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(void)
{
#ifdef TIOCFLUSH
(void) ioctl(fileno(stdout), TIOCFLUSH, (char *) 0);
#else
(void) ioctl(fileno(stdout), TCFLSH, (char *) 0);
#endif
}
void
TerminalSaveState(void)
{
#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(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(void)
{
#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 */
}
/*
* 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(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;
#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
(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
(void) signal(SIGINFO, (void (*)(int))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
ioctl(tin, FIONBIO, (char *)&onoff);
ioctl(tout, FIONBIO, (char *)&onoff);
}
/*
* 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(long *ispeed, long *ospeed)
{
#ifdef DECODE_BAUD
struct termspeeds *tp;
#endif /* DECODE_BAUD */
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(long *rows, long *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(int fd)
{
return close(fd);
}
static void
NetNonblockingIO(int fd, int onoff)
{
ioctl(fd, FIONBIO, (char *)&onoff);
}
/*
* Various signal handling routines.
*/
/* ARGSUSED */
static SIG_FUNC_RET
deadpeer(int sig __unused)
{
setcommandmode();
longjmp(peerdied, -1);
}
/* ARGSUSED */
SIG_FUNC_RET
intr(int sig __unused)
{
if (localchars) {
intp();
return;
}
setcommandmode();
longjmp(toplevel, -1);
}
/* ARGSUSED */
SIG_FUNC_RET
intr2(int sig __unused)
{
if (localchars) {
#ifdef KLUDGELINEMODE
if (kludgelinemode)
sendbrk();
else
#endif
sendabort();
return;
}
}
#ifdef SIGTSTP
/* ARGSUSED */
SIG_FUNC_RET
susp(int sig __unused)
{
if ((rlogin != _POSIX_VDISABLE) && rlogin_susp())
return;
if (localchars)
sendsusp();
}
#endif
#ifdef SIGWINCH
/* ARGSUSED */
static SIG_FUNC_RET
sendwin(int sig __unused)
{
if (connected) {
sendnaws();
}
}
#endif
#ifdef SIGINFO
/* ARGSUSED */
SIG_FUNC_RET
ayt(int sig __unused)
{
if (connected)
sendayt();
else
ayt_status();
}
#endif
void
sys_telnet_init(void)
{
(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(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(int netin, int netout, int netex, int ttyin, int ttyout, int poll)
{
int c;
int returnValue = 0;
static struct timeval TimeValue = { 0, 0 };
int maxfd = -1;
int tmp;
if ((netout || netin || netex) && net > maxfd)
maxfd = net;
if (ttyout && tout > maxfd)
maxfd = tout;
if (ttyin && tin > maxfd)
maxfd = tin;
tmp = howmany(maxfd+1, NFDBITS) * sizeof(fd_mask);
if (tmp > fdsn) {
if (ibitsp)
free(ibitsp);
if (obitsp)
free(obitsp);
if (xbitsp)
free(xbitsp);
fdsn = tmp;
if ((ibitsp = (fd_set *)malloc(fdsn)) == NULL)
err(1, "malloc");
if ((obitsp = (fd_set *)malloc(fdsn)) == NULL)
err(1, "malloc");
if ((xbitsp = (fd_set *)malloc(fdsn)) == NULL)
err(1, "malloc");
memset(ibitsp, 0, fdsn);
memset(obitsp, 0, fdsn);
memset(xbitsp, 0, fdsn);
}
if (netout)
FD_SET(net, obitsp);
if (ttyout)
FD_SET(tout, obitsp);
if (ttyin)
FD_SET(tin, ibitsp);
if (netin)
FD_SET(net, ibitsp);
if (netex)
FD_SET(net, xbitsp);
if ((c = select(maxfd + 1, ibitsp, obitsp, xbitsp,
(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;
}
/* 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, xbitsp)) {
FD_CLR(net, xbitsp);
SYNCHing = 1;
(void) ttyflush(1); /* flush already enqueued data */
}
/*
* Something to read from the network...
*/
if (FD_ISSET(net, ibitsp)) {
int canread;
FD_CLR(net, ibitsp);
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, ibitsp)) {
FD_CLR(tin, ibitsp);
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, obitsp)) {
FD_CLR(net, obitsp);
returnValue |= netflush();
}
if (FD_ISSET(tout, obitsp)) {
FD_CLR(tout, obitsp);
returnValue |= (ttyflush(SYNCHing|flushout) > 0);
}
return returnValue;
}
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