/* $NetBSD: sys_bsd.c,v 1.32 2004/11/10 20:26:43 christos 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 #ifndef lint #if 0 from: static char sccsid[] = "@(#)sys_bsd.c 8.4 (Berkeley) 5/30/95"; #else __RCSID("$NetBSD: sys_bsd.c,v 1.32 2004/11/10 20:26:43 christos 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 #include #include #include #include #include #include #include #include #include #include "ring.h" #include "defines.h" #include "externs.h" #include "types.h" #define SIG_FUNC_RET void SIG_FUNC_RET susp(int); SIG_FUNC_RET ayt(int); SIG_FUNC_RET intr(int); SIG_FUNC_RET intr2(int); SIG_FUNC_RET sendwin(int); int tout, /* Output file descriptor */ tin, /* Input file descriptor */ net; struct termios old_tc = { 0 }; extern struct termios 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 */ 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)); } #ifdef notdef void TerminalRestoreState(void) { } #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(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, (char *)&onoff); ioctl(tout, FIONBIO, (char *)&onoff); #if defined(TN3270) if (noasynchtty == 0) { ioctl(tin, FIOASYNC, (char *)&onoff); } #endif /* defined(TN3270) */ } 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); } void NetNonblockingIO(int fd, int onoff) { ioctl(fd, FIONBIO, (char *)&onoff); } #ifdef TN3270 void NetSigIO(int fd, int onoff) { ioctl(fd, FIOASYNC, (char *)&onoff); /* hear about input */ } void NetSetPgrp(int fd) { int myPid; myPid = getpid(); fcntl(fd, F_SETOWN, myPid); } #endif /*defined(TN3270)*/ /* * Various signal handling routines. */ /* ARGSUSED */ SIG_FUNC_RET intr(int sig) { if (localchars) { intp(); return; } setcommandmode(); longjmp(toplevel, -1); } /* ARGSUSED */ SIG_FUNC_RET intr2(int sig) { if (localchars) { #ifdef KLUDGELINEMODE if (kludgelinemode) sendbrk(); else #endif sendabort(); return; } } /* ARGSUSED */ SIG_FUNC_RET susp(int sig) { if ((rlogin != _POSIX_VDISABLE) && rlogin_susp()) return; if (localchars) sendsusp(); } /* ARGSUSED */ SIG_FUNC_RET sendwin(int sig) { if (connected) { sendnaws(); } } /* ARGSUSED */ SIG_FUNC_RET ayt(int sig) { if (connected) sendayt(); else ayt_status(); } void sys_telnet_init(void) { (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); NetNonblockingIO(net, 1); #ifdef TN3270 if (noasynchnet == 0) { /* DBX can't handle! */ NetSigIO(net, 1); NetSetPgrp(net); } #endif /* defined(TN3270) */ if (SetSockOpt(net, SOL_SOCKET, SO_OOBINLINE, 1) == -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; } #ifdef TN3270 /* * we can get EBADF if we were in transparent * mode, and the transcom process died. */ if (errno == EBADF) return 0; #endif /* defined(TN3270) */ /* 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; }