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/* $OpenBSD: sys_bsd.c,v 1.34 2017/07/19 12:25:52 deraadt Exp $ */ |
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/* $NetBSD: sys_bsd.c,v 1.11 1996/02/28 21:04:10 thorpej Exp $ */ |
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/* |
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* Copyright (c) 1988, 1990, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include "telnet_locl.h" |
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#include <sys/ioctl.h> |
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#include <sys/socket.h> |
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#include <arpa/telnet.h> |
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#include <errno.h> |
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#include <poll.h> |
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#include <string.h> |
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#include <unistd.h> |
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/* |
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* The following routines try to encapsulate what is system dependent |
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* (at least between 4.x and dos) which is used in telnet.c. |
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*/ |
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int |
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tout, /* Output file descriptor */ |
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tin, /* Input file descriptor */ |
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net; |
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#define TELNET_FD_TOUT 0 |
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#define TELNET_FD_TIN 1 |
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#define TELNET_FD_NET 2 |
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#define TELNET_FD_NUM 3 |
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struct termios old_tc = { 0 }; |
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void |
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init_sys(void) |
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{ |
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tout = fileno(stdout); |
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tin = fileno(stdin); |
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errno = 0; |
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} |
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/* |
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* TerminalSpecialChars() |
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* |
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* Look at an input character to see if it is a special character |
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* and decide what to do. |
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* |
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* Output: |
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* |
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* 0 Don't add this character. |
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* 1 Do add this character |
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*/ |
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int |
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TerminalSpecialChars(int c) |
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{ |
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if (c == termIntChar) { |
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intp(); |
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return 0; |
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} else if (c == termQuitChar) { |
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#ifdef KLUDGELINEMODE |
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if (kludgelinemode) |
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sendbrk(); |
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else |
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#endif |
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sendabort(); |
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return 0; |
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} else if (c == termEofChar) { |
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if (my_want_state_is_will(TELOPT_LINEMODE)) { |
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sendeof(); |
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return 0; |
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} |
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return 1; |
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} else if (c == termSuspChar) { |
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sendsusp(); |
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return(0); |
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} else if (c == termFlushChar) { |
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xmitAO(); /* Transmit Abort Output */ |
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return 0; |
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} else if (!MODE_LOCAL_CHARS(globalmode)) { |
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if (c == termKillChar) { |
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xmitEL(); |
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return 0; |
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} else if (c == termEraseChar) { |
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xmitEC(); /* Transmit Erase Character */ |
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return 0; |
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} |
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} |
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return 1; |
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} |
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void |
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TerminalSaveState(void) |
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{ |
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tcgetattr(0, &old_tc); |
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new_tc = old_tc; |
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} |
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cc_t * |
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tcval(int func) |
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{ |
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switch(func) { |
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case SLC_IP: return(&termIntChar); |
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case SLC_ABORT: return(&termQuitChar); |
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case SLC_EOF: return(&termEofChar); |
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case SLC_EC: return(&termEraseChar); |
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case SLC_EL: return(&termKillChar); |
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case SLC_XON: return(&termStartChar); |
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case SLC_XOFF: return(&termStopChar); |
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case SLC_FORW1: return(&termForw1Char); |
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case SLC_FORW2: return(&termForw2Char); |
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case SLC_SUSP: return(&termSuspChar); |
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case SLC_AO: return(&termFlushChar); |
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case SLC_EW: return(&termWerasChar); |
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case SLC_RP: return(&termRprntChar); |
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case SLC_LNEXT: return(&termLiteralNextChar); |
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case SLC_AYT: return(&termAytChar); |
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case SLC_SYNCH: |
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case SLC_BRK: |
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case SLC_EOR: |
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default: |
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return(NULL); |
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} |
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} |
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void |
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TerminalDefaultChars(void) |
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{ |
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memcpy(new_tc.c_cc, old_tc.c_cc, sizeof(old_tc.c_cc)); |
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} |
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/* |
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* TerminalNewMode - set up terminal to a specific mode. |
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* MODE_ECHO: do local terminal echo |
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* MODE_FLOW: do local flow control |
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* MODE_TRAPSIG: do local mapping to TELNET IAC sequences |
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* MODE_EDIT: do local line editing |
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* |
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* Command mode: |
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* MODE_ECHO|MODE_EDIT|MODE_FLOW|MODE_TRAPSIG |
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* local echo |
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* local editing |
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* local xon/xoff |
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* local signal mapping |
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* |
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* Linemode: |
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* local/no editing |
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* Both Linemode and Single Character mode: |
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* local/remote echo |
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* local/no xon/xoff |
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* local/no signal mapping |
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*/ |
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static void susp(); |
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static void ayt(); |
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void |
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TerminalNewMode(int f) |
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{ |
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static int prevmode = 0; |
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struct termios tmp_tc; |
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int onoff; |
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int old; |
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cc_t esc; |
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globalmode = f&~MODE_FORCE; |
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if (prevmode == f) |
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return; |
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/* |
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* Write any outstanding data before switching modes |
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* ttyflush() returns 0 only when there is no more data |
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* left to write out, it returns -1 if it couldn't do |
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* anything at all, otherwise it returns 1 + the number |
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* of characters left to write. |
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*/ |
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old = ttyflush(SYNCHing|flushout); |
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if (old < 0 || old > 1) { |
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tcgetattr(tin, &tmp_tc); |
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do { |
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/* |
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* Wait for data to drain, then flush again. |
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*/ |
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if (isatty(tin)) |
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tcsetattr(tin, TCSADRAIN, &tmp_tc); |
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old = ttyflush(SYNCHing|flushout); |
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} while (old < 0 || old > 1); |
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} |
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old = prevmode; |
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prevmode = f&~MODE_FORCE; |
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tmp_tc = new_tc; |
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if (f&MODE_ECHO) { |
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tmp_tc.c_lflag |= ECHO; |
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tmp_tc.c_oflag |= ONLCR; |
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if (crlf) |
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tmp_tc.c_iflag |= ICRNL; |
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} else { |
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tmp_tc.c_lflag &= ~ECHO; |
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tmp_tc.c_oflag &= ~ONLCR; |
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} |
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if ((f&MODE_FLOW) == 0) { |
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tmp_tc.c_iflag &= ~(IXOFF|IXON); /* Leave the IXANY bit alone */ |
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} else { |
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if (restartany < 0) { |
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tmp_tc.c_iflag |= IXOFF|IXON; /* Leave the IXANY bit alone */ |
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} else if (restartany > 0) { |
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tmp_tc.c_iflag |= IXOFF|IXON|IXANY; |
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} else { |
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tmp_tc.c_iflag |= IXOFF|IXON; |
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tmp_tc.c_iflag &= ~IXANY; |
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} |
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} |
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if ((f&MODE_TRAPSIG) == 0) { |
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tmp_tc.c_lflag &= ~ISIG; |
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localchars = 0; |
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} else { |
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tmp_tc.c_lflag |= ISIG; |
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localchars = 1; |
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} |
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if (f&MODE_EDIT) { |
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tmp_tc.c_lflag |= ICANON; |
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} else { |
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tmp_tc.c_lflag &= ~ICANON; |
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tmp_tc.c_iflag &= ~ICRNL; |
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tmp_tc.c_cc[VMIN] = 1; |
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tmp_tc.c_cc[VTIME] = 0; |
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} |
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if ((f&(MODE_EDIT|MODE_TRAPSIG)) == 0) { |
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tmp_tc.c_lflag &= ~IEXTEN; |
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} |
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if (f&MODE_SOFT_TAB) { |
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# ifdef OXTABS |
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tmp_tc.c_oflag |= OXTABS; |
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# endif |
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# ifdef TABDLY |
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tmp_tc.c_oflag &= ~TABDLY; |
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tmp_tc.c_oflag |= TAB3; |
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# endif |
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} else { |
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# ifdef OXTABS |
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tmp_tc.c_oflag &= ~OXTABS; |
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# endif |
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# ifdef TABDLY |
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tmp_tc.c_oflag &= ~TABDLY; |
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# endif |
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} |
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if (f&MODE_LIT_ECHO) { |
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# ifdef ECHOCTL |
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tmp_tc.c_lflag &= ~ECHOCTL; |
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# endif |
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} else { |
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# ifdef ECHOCTL |
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tmp_tc.c_lflag |= ECHOCTL; |
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# endif |
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} |
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if (f == -1) { |
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onoff = 0; |
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} else { |
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if (f & MODE_INBIN) |
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tmp_tc.c_iflag &= ~ISTRIP; |
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else |
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tmp_tc.c_iflag |= ISTRIP; |
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if ((f & MODE_OUTBIN) || (f & MODE_OUT8)) { |
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tmp_tc.c_cflag &= ~(CSIZE|PARENB); |
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tmp_tc.c_cflag |= CS8; |
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if(f & MODE_OUTBIN) |
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tmp_tc.c_oflag &= ~OPOST; |
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else |
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tmp_tc.c_oflag |= OPOST; |
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309 |
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} else { |
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tmp_tc.c_cflag &= ~(CSIZE|PARENB); |
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tmp_tc.c_cflag |= old_tc.c_cflag & (CSIZE|PARENB); |
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tmp_tc.c_oflag |= OPOST; |
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} |
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onoff = 1; |
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} |
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317 |
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if (f != -1) { |
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(void) signal(SIGTSTP, susp); |
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(void) signal(SIGINFO, ayt); |
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#if defined(NOKERNINFO) |
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tmp_tc.c_lflag |= NOKERNINFO; |
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#endif |
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/* |
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* We don't want to process ^Y here. It's just another |
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* character that we'll pass on to the back end. It has |
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* to process it because it will be processed when the |
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* user attempts to read it, not when we send it. |
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*/ |
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# ifdef VDSUSP |
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tmp_tc.c_cc[VDSUSP] = (cc_t)(_POSIX_VDISABLE); |
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# endif |
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/* |
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* If the VEOL character is already set, then use VEOL2, |
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* otherwise use VEOL. |
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*/ |
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esc = (rlogin != _POSIX_VDISABLE) ? rlogin : escape; |
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if ((tmp_tc.c_cc[VEOL] != esc) |
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# ifdef VEOL2 |
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&& (tmp_tc.c_cc[VEOL2] != esc) |
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# endif |
341 |
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) { |
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if (tmp_tc.c_cc[VEOL] == (cc_t)(_POSIX_VDISABLE)) |
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tmp_tc.c_cc[VEOL] = esc; |
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# ifdef VEOL2 |
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else if (tmp_tc.c_cc[VEOL2] == (cc_t)(_POSIX_VDISABLE)) |
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tmp_tc.c_cc[VEOL2] = esc; |
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# endif |
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} |
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} else { |
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sigset_t mask; |
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(void) signal(SIGINFO, ayt_status); |
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(void) signal(SIGTSTP, SIG_DFL); |
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sigemptyset(&mask); |
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sigaddset(&mask, SIGTSTP); |
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sigprocmask(SIG_UNBLOCK, &mask, NULL); |
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tmp_tc = old_tc; |
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} |
358 |
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if (isatty(tin) && tcsetattr(tin, TCSADRAIN, &tmp_tc) < 0) |
359 |
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tcsetattr(tin, TCSANOW, &tmp_tc); |
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361 |
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ioctl(tin, FIONBIO, &onoff); |
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ioctl(tout, FIONBIO, &onoff); |
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} |
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|
365 |
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void |
366 |
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TerminalSpeeds(long *ispeed, long *ospeed) |
367 |
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{ |
368 |
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long in, out; |
369 |
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370 |
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out = cfgetospeed(&old_tc); |
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in = cfgetispeed(&old_tc); |
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if (in == 0) |
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in = out; |
374 |
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375 |
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*ispeed = in; |
376 |
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*ospeed = out; |
377 |
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} |
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|
379 |
|
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int |
380 |
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TerminalWindowSize(long *rows, long *cols) |
381 |
|
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{ |
382 |
|
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struct winsize ws; |
383 |
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|
384 |
|
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if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) >= 0) { |
385 |
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*rows = ws.ws_row; |
386 |
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*cols = ws.ws_col; |
387 |
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return 1; |
388 |
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} |
389 |
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return 0; |
390 |
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} |
391 |
|
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|
392 |
|
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/* |
393 |
|
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* Various signal handling routines. |
394 |
|
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*/ |
395 |
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|
396 |
|
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void |
397 |
|
|
deadpeer(int sig) |
398 |
|
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{ |
399 |
|
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setcommandmode(); |
400 |
|
|
longjmp(peerdied, -1); |
401 |
|
|
} |
402 |
|
|
|
403 |
|
|
void |
404 |
|
|
intr(int sig) |
405 |
|
|
{ |
406 |
|
|
if (localchars) { |
407 |
|
|
intp(); |
408 |
|
|
return; |
409 |
|
|
} |
410 |
|
|
setcommandmode(); |
411 |
|
|
longjmp(toplevel, -1); |
412 |
|
|
} |
413 |
|
|
|
414 |
|
|
void |
415 |
|
|
intr2(int sig) |
416 |
|
|
{ |
417 |
|
|
if (localchars) { |
418 |
|
|
#ifdef KLUDGELINEMODE |
419 |
|
|
if (kludgelinemode) |
420 |
|
|
sendbrk(); |
421 |
|
|
else |
422 |
|
|
#endif |
423 |
|
|
sendabort(); |
424 |
|
|
return; |
425 |
|
|
} |
426 |
|
|
} |
427 |
|
|
|
428 |
|
|
void |
429 |
|
|
susp(int sig) |
430 |
|
|
{ |
431 |
|
|
if ((rlogin != _POSIX_VDISABLE) && rlogin_susp()) |
432 |
|
|
return; |
433 |
|
|
if (localchars) |
434 |
|
|
sendsusp(); |
435 |
|
|
} |
436 |
|
|
|
437 |
|
|
void |
438 |
|
|
sendwin(int sig) |
439 |
|
|
{ |
440 |
|
|
if (connected) { |
441 |
|
|
sendnaws(); |
442 |
|
|
} |
443 |
|
|
} |
444 |
|
|
|
445 |
|
|
void |
446 |
|
|
ayt(int sig) |
447 |
|
|
{ |
448 |
|
|
if (connected) |
449 |
|
|
sendayt(); |
450 |
|
|
else |
451 |
|
|
ayt_status(sig); |
452 |
|
|
} |
453 |
|
|
|
454 |
|
|
|
455 |
|
|
void |
456 |
|
|
sys_telnet_init(void) |
457 |
|
|
{ |
458 |
|
|
int one = 1; |
459 |
|
|
|
460 |
|
|
(void) signal(SIGINT, intr); |
461 |
|
|
(void) signal(SIGQUIT, intr2); |
462 |
|
|
(void) signal(SIGPIPE, deadpeer); |
463 |
|
|
(void) signal(SIGWINCH, sendwin); |
464 |
|
|
(void) signal(SIGTSTP, susp); |
465 |
|
|
(void) signal(SIGINFO, ayt); |
466 |
|
|
|
467 |
|
|
setconnmode(0); |
468 |
|
|
|
469 |
|
|
/* |
470 |
|
|
* Mark the socket as non-blocking and receive urgent data inline. |
471 |
|
|
* (The latter is required for correct telnet operation when a |
472 |
|
|
* second urgent is sent before telnet can process the first.) |
473 |
|
|
*/ |
474 |
|
|
ioctl(net, FIONBIO, &one); |
475 |
|
|
if (setsockopt(net, SOL_SOCKET, SO_OOBINLINE, &one, sizeof(one)) == -1) { |
476 |
|
|
perror("setsockopt"); |
477 |
|
|
} |
478 |
|
|
} |
479 |
|
|
|
480 |
|
|
/* |
481 |
|
|
* Process rings - |
482 |
|
|
* |
483 |
|
|
* This routine tries to fill up/empty our various rings. |
484 |
|
|
* |
485 |
|
|
* The parameter specifies whether this is a poll operation, |
486 |
|
|
* or a block-until-something-happens operation. |
487 |
|
|
* |
488 |
|
|
* The return value is 1 if something happened, 0 if not. |
489 |
|
|
*/ |
490 |
|
|
|
491 |
|
|
int |
492 |
|
|
process_rings(int netin, int netout, int netex, int ttyin, int ttyout, |
493 |
|
|
int dopoll) /* If 0, then block until something to do */ |
494 |
|
|
{ |
495 |
|
|
int c; |
496 |
|
|
/* One wants to be a bit careful about setting returnValue |
497 |
|
|
* to one, since a one implies we did some useful work, |
498 |
|
|
* and therefore probably won't be called to block next |
499 |
|
|
* time (TN3270 mode only). |
500 |
|
|
*/ |
501 |
|
|
int returnValue = 0; |
502 |
|
|
struct pollfd pfd[TELNET_FD_NUM]; |
503 |
|
|
|
504 |
|
|
if (ttyout) { |
505 |
|
|
pfd[TELNET_FD_TOUT].fd = tout; |
506 |
|
|
pfd[TELNET_FD_TOUT].events = POLLOUT; |
507 |
|
|
} else { |
508 |
|
|
pfd[TELNET_FD_TOUT].fd = -1; |
509 |
|
|
} |
510 |
|
|
if (ttyin) { |
511 |
|
|
pfd[TELNET_FD_TIN].fd = tin; |
512 |
|
|
pfd[TELNET_FD_TIN].events = POLLIN; |
513 |
|
|
} else { |
514 |
|
|
pfd[TELNET_FD_TIN].fd = -1; |
515 |
|
|
} |
516 |
|
|
if (netout || netin || netex) { |
517 |
|
|
pfd[TELNET_FD_NET].fd = net; |
518 |
|
|
pfd[TELNET_FD_NET].events = 0; |
519 |
|
|
if (netout) |
520 |
|
|
pfd[TELNET_FD_NET].events |= POLLOUT; |
521 |
|
|
if (netin) |
522 |
|
|
pfd[TELNET_FD_NET].events |= POLLIN; |
523 |
|
|
if (netex) |
524 |
|
|
pfd[TELNET_FD_NET].events |= POLLRDBAND; |
525 |
|
|
} else { |
526 |
|
|
pfd[TELNET_FD_NET].fd = -1; |
527 |
|
|
} |
528 |
|
|
|
529 |
|
|
if ((c = poll(pfd, TELNET_FD_NUM, dopoll ? 0 : INFTIM)) < 0) { |
530 |
|
|
return 0; |
531 |
|
|
} |
532 |
|
|
|
533 |
|
|
/* |
534 |
|
|
* Any urgent data? |
535 |
|
|
*/ |
536 |
|
|
if (pfd[TELNET_FD_NET].revents & POLLRDBAND) { |
537 |
|
|
SYNCHing = 1; |
538 |
|
|
(void) ttyflush(1); /* flush already enqueued data */ |
539 |
|
|
} |
540 |
|
|
|
541 |
|
|
/* |
542 |
|
|
* Something to read from the network... |
543 |
|
|
*/ |
544 |
|
|
if (pfd[TELNET_FD_NET].revents & (POLLIN|POLLHUP)) { |
545 |
|
|
int canread; |
546 |
|
|
|
547 |
|
|
canread = ring_empty_consecutive(&netiring); |
548 |
|
|
c = recv(net, netiring.supply, canread, 0); |
549 |
|
|
if (c < 0 && errno == EWOULDBLOCK) { |
550 |
|
|
c = 0; |
551 |
|
|
} else if (c <= 0) { |
552 |
|
|
return -1; |
553 |
|
|
} |
554 |
|
|
if (netdata) { |
555 |
|
|
Dump('<', netiring.supply, c); |
556 |
|
|
} |
557 |
|
|
if (c) |
558 |
|
|
ring_supplied(&netiring, c); |
559 |
|
|
returnValue = 1; |
560 |
|
|
} |
561 |
|
|
|
562 |
|
|
/* |
563 |
|
|
* Something to read from the tty... |
564 |
|
|
*/ |
565 |
|
|
if (pfd[TELNET_FD_TIN].revents & (POLLIN|POLLHUP)) { |
566 |
|
|
c = read(tin, ttyiring.supply, ring_empty_consecutive(&ttyiring)); |
567 |
|
|
if (c < 0 && errno == EIO) |
568 |
|
|
c = 0; |
569 |
|
|
if (c < 0 && errno == EWOULDBLOCK) { |
570 |
|
|
c = 0; |
571 |
|
|
} else { |
572 |
|
|
/* EOF detection for line mode!!!! */ |
573 |
|
|
if ((c == 0) && MODE_LOCAL_CHARS(globalmode) && isatty(tin)) { |
574 |
|
|
/* must be an EOF... */ |
575 |
|
|
*ttyiring.supply = termEofChar; |
576 |
|
|
c = 1; |
577 |
|
|
} |
578 |
|
|
if (c <= 0) { |
579 |
|
|
return -1; |
580 |
|
|
} |
581 |
|
|
if (termdata) { |
582 |
|
|
Dump('<', ttyiring.supply, c); |
583 |
|
|
} |
584 |
|
|
ring_supplied(&ttyiring, c); |
585 |
|
|
} |
586 |
|
|
returnValue = 1; /* did something useful */ |
587 |
|
|
} |
588 |
|
|
|
589 |
|
|
if (pfd[TELNET_FD_NET].revents & POLLOUT) { |
590 |
|
|
returnValue |= netflush(); |
591 |
|
|
} |
592 |
|
|
if (pfd[TELNET_FD_TOUT].revents & POLLOUT) { |
593 |
|
|
returnValue |= (ttyflush(SYNCHing|flushout) > 0); |
594 |
|
|
} |
595 |
|
|
|
596 |
|
|
return returnValue; |
597 |
|
|
} |