/* $NetBSD: sys_bsd.c,v 1.40 2018/12/14 06:28:49 maya Exp $ */
/*
* 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. 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>
#ifndef lint
#if 0
from: static char sccsid[] = "@(#)sys_bsd.c 8.4 (Berkeley) 5/30/95";
#else
__RCSID("$NetBSD: sys_bsd.c,v 1.40 2018/12/14 06:28:49 maya Exp $");
#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 <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <poll.h>
#include <arpa/telnet.h>
#include "ring.h"
#include "defines.h"
#include "externs.h"
#include "types.h"
void susp(int);
void ayt(int);
void intr(int);
void intr2(int);
void sendwin(int);
int
tout, /* Output file descriptor */
tin, /* Input file descriptor */
net;
struct termios old_tc = { .c_iflag = 0 };
extern struct termios new_tc;
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(unsigned char *buf, int n)
{
return read(tin, buf, n);
}
/*
*
*/
int
TerminalAutoFlush(void)
{
return 1;
}
#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)
{
int com = 0;
(void) ioctl(fileno(stdout), TIOCFLUSH, &com);
}
void
TerminalSaveState(void)
{
tcgetattr(0, &old_tc);
new_tc = old_tc;
}
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);
case SLC_FORW2: return(&termForw2Char);
case SLC_AO: return(&termFlushChar);
case SLC_SUSP: return(&termSuspChar);
case SLC_EW: return(&termWerasChar);
case SLC_RP: return(&termRprntChar);
case SLC_LNEXT: return(&termLiteralNextChar);
case SLC_AYT: return(&termAytChar);
case SLC_SYNCH:
case SLC_BRK:
case SLC_EOR:
default:
return((cc_t *)0);
}
}
void
TerminalDefaultChars(void)
{
memmove(new_tc.c_cc, old_tc.c_cc, sizeof(old_tc.c_cc));
}
/*
* 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;
struct termios tmp_tc;
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 to 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) {
tcgetattr(tin, &tmp_tc);
do {
/*
* Wait for data to drain, then flush again.
*/
tcsetattr(tin, TCSADRAIN, &tmp_tc);
old = ttyflush(SYNCHing|flushout);
} while (old < 0 || old > 1);
}
old = prevmode;
prevmode = f&~MODE_FORCE;
tmp_tc = new_tc;
if (f&MODE_ECHO) {
tmp_tc.c_lflag |= ECHO;
tmp_tc.c_oflag |= ONLCR;
if (crlf)
tmp_tc.c_iflag |= ICRNL;
} else {
tmp_tc.c_lflag &= ~ECHO;
tmp_tc.c_oflag &= ~ONLCR;
# ifdef notdef
if (crlf)
tmp_tc.c_iflag &= ~ICRNL;
# endif
}
if ((f&MODE_FLOW) == 0) {
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;
}
}
if ((f&MODE_TRAPSIG) == 0) {
tmp_tc.c_lflag &= ~ISIG;
localchars = 0;
} else {
tmp_tc.c_lflag |= ISIG;
localchars = 1;
}
if (f&MODE_EDIT) {
tmp_tc.c_lflag |= ICANON;
} else {
tmp_tc.c_lflag &= ~ICANON;
tmp_tc.c_iflag &= ~ICRNL;
tmp_tc.c_cc[VMIN] = 1;
tmp_tc.c_cc[VTIME] = 0;
}
if ((f&(MODE_EDIT|MODE_TRAPSIG)) == 0) {
tmp_tc.c_lflag &= ~IEXTEN;
}
if (f&MODE_SOFT_TAB) {
# ifdef OXTABS
tmp_tc.c_oflag |= OXTABS;
# endif
# ifdef TABDLY
tmp_tc.c_oflag &= ~TABDLY;
tmp_tc.c_oflag |= TAB3;
# endif
} else {
# ifdef OXTABS
tmp_tc.c_oflag &= ~OXTABS;
# endif
# ifdef TABDLY
tmp_tc.c_oflag &= ~TABDLY;
# endif
}
if (f&MODE_LIT_ECHO) {
# ifdef ECHOCTL
tmp_tc.c_lflag &= ~ECHOCTL;
# endif
} else {
# ifdef ECHOCTL
tmp_tc.c_lflag |= ECHOCTL;
# endif
}
if (f == -1) {
onoff = 0;
} 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;
}
onoff = 1;
}
if (f != -1) {
(void) signal(SIGTSTP, susp);
(void) signal(SIGINFO, ayt);
#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.
*/
# ifdef VDSUSP
tmp_tc.c_cc[VDSUSP] = (cc_t)(_POSIX_VDISABLE);
# endif
/*
* 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 {
(void) signal(SIGINFO, (void (*)(int)) ayt_status);
(void) signal(SIGTSTP, SIG_DFL);
(void) sigsetmask(sigblock(0) & ~(1<<(SIGTSTP-1)));
tmp_tc = old_tc;
}
if (tcsetattr(tin, TCSADRAIN, &tmp_tc) < 0)
tcsetattr(tin, TCSANOW, &tmp_tc);
ioctl(tin, FIONBIO, &onoff);
ioctl(tout, FIONBIO, &onoff);
}
void
TerminalSpeeds(long *ispeed, long *ospeed)
{
long in, out;
out = cfgetospeed(&old_tc);
in = cfgetispeed(&old_tc);
if (in == 0) {
in = out;
*ispeed = in;
*ospeed = out;
}
}
int
TerminalWindowSize(long *rows, long *cols)
{
struct winsize ws;
if (ioctl(fileno(stdin), TIOCGWINSZ, (char *)&ws) >= 0) {
*rows = ws.ws_row;
*cols = ws.ws_col;
return 1;
}
return 0;
}
int
NetClose(int fd)
{
return close(fd);
}
/*
* Various signal handling routines.
*/
/* ARGSUSED */
void
intr(int sig)
{
if (localchars) {
intp();
return;
}
setcommandmode();
longjmp(toplevel, -1);
}
/* ARGSUSED */
void
intr2(int sig)
{
if (localchars) {
#ifdef KLUDGELINEMODE
if (kludgelinemode)
sendbrk();
else
#endif
sendabort();
return;
}
}
/* ARGSUSED */
void
susp(int sig)
{
if ((rlogin != _POSIX_VDISABLE) && rlogin_susp())
return;
if (localchars)
sendsusp();
}
/* ARGSUSED */
void
sendwin(int sig)
{
if (connected) {
sendnaws();
}
}
/* ARGSUSED */
void
ayt(int sig)
{
if (connected)
sendayt();
else
ayt_status();
}
void
sys_telnet_init(void)
{
int one = 1;
(void) signal(SIGINT, intr);
(void) signal(SIGQUIT, intr2);
(void) signal(SIGPIPE, SIG_IGN);
(void) signal(SIGWINCH, sendwin);
(void) signal(SIGTSTP, susp);
(void) signal(SIGINFO, ayt);
setconnmode(0);
ioctl(net, FIONBIO, &one);
if (setsockopt(net, SOL_SOCKET, SO_OOBINLINE, &one, sizeof(one)) == -1) {
perror("setsockopt");
}
}
/*
* 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, < 0 if an
* error occurred.
*/
int
process_rings(int netin, int netout, int netex, int ttyin, int ttyout,
int dopoll) /* If 0, then block until something to do */
{
struct pollfd set[3];
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;
set[0].fd = net;
set[0].events = (netout ? POLLOUT : 0) | (netin ? POLLIN : 0) |
(netex ? POLLPRI : 0);
set[1].fd = tout;
set[1].events = ttyout ? POLLOUT : 0;
set[2].fd = tin;
set[2].events = ttyin ? POLLIN : 0;
if ((c = poll(set, 3, dopoll ? 0 : INFTIM)) < 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 poll\r\n");
sleep(5);
}
return 0;
}
/*
* Any urgent data?
*/
if (set[0].revents & POLLPRI) {
SYNCHing = 1;
(void) ttyflush(1); /* flush already enqueued data */
}
/*
* Something to read from the network...
*/
if (set[0].revents & POLLIN) {
int canread;
canread = ring_empty_consecutive(&netiring);
c = recv(net, (char *)netiring.supply, canread, 0);
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 (set[2].revents & POLLIN) {
c = TerminalRead(ttyiring.supply, ring_empty_consecutive(&ttyiring));
if (c < 0 && errno == EIO)
c = 0;
if (c < 0 && errno == EWOULDBLOCK) {
c = 0;
} else {
if (c < 0) {
return -1;
}
if (c == 0) {
/* must be an EOF... */
if (MODE_LOCAL_CHARS(globalmode) && isatty(tin)) {
*ttyiring.supply = termEofChar;
c = 1;
} else {
clienteof = 1;
shutdown(net, 1);
return 0;
}
}
if (termdata) {
Dump('<', ttyiring.supply, c);
}
ring_supplied(&ttyiring, c);
}
returnValue = 1; /* did something useful */
}
if (set[0].revents & POLLOUT) {
returnValue |= netflush();
}
if (set[1].revents & (POLLHUP|POLLNVAL))
return(-1);
if (set[1].revents & POLLOUT) {
returnValue |= (ttyflush(SYNCHing|flushout) > 0);
}
return returnValue;
}
