From f9ab90d9d6d02989a075d0f0074496d5b1045e4b Mon Sep 17 00:00:00 2001 From: rgrimes Date: Fri, 27 May 1994 12:33:43 +0000 Subject: BSD 4.4 Lite Usr.bin Sources --- usr.bin/telnet/sys_bsd.c | 1167 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1167 insertions(+) create mode 100644 usr.bin/telnet/sys_bsd.c (limited to 'usr.bin/telnet/sys_bsd.c') diff --git a/usr.bin/telnet/sys_bsd.c b/usr.bin/telnet/sys_bsd.c new file mode 100644 index 0000000..85414e2 --- /dev/null +++ b/usr.bin/telnet/sys_bsd.c @@ -0,0 +1,1167 @@ +/* + * 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 +static char sccsid[] = "@(#)sys_bsd.c 8.2 (Berkeley) 12/15/93"; +#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 +#include +#include +#include +#include +#include +#include + +#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 SIGTSTP + SIG_FUNC_RET susp(); +#endif /* SIGTSTP */ +#ifdef SIGINFO + SIG_FUNC_RET ayt(); +#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 SIGTSTP + (void) signal(SIGTSTP, SIG_DFL); + (void) sigsetmask(sigblock(0) & ~(1<<(SIGTSTP-1))); +#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 *)<c); + 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) */ + +} + +#ifndef B19200 +# define B19200 B9600 +#endif + +#ifndef B38400 +# define B38400 B19200 +#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 }, { 9600, B9600 }, { 19200, B19200 }, + { 38400, B38400 }, { -1, B38400 } +}; + + void +TerminalSpeeds(ispeed, ospeed) + long *ispeed; + long *ospeed; +{ + register struct termspeeds *tp; + register long in, out; + + out = cfgetospeed(&old_tc); + in = cfgetispeed(&old_tc); + if (in == 0) + in = out; + + 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; +} + + 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\r\n"); + 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 && + bcmp(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 == 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; +} -- cgit v1.1