1 /* $OpenBSD: terminal.c,v 1.13 2014/07/22 07:30:24 jsg Exp $ */ 2 /* $NetBSD: terminal.c,v 1.5 1996/02/28 21:04:17 thorpej Exp $ */ 3 4 /* 5 * Copyright (c) 1988, 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include "telnet_locl.h" 34 35 #include <arpa/telnet.h> 36 #include <errno.h> 37 #include <unistd.h> 38 39 Ring ttyoring, ttyiring; 40 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ]; 41 42 int termdata; /* Debugging flag */ 43 44 # ifndef VDISCARD 45 cc_t termFlushChar; 46 # endif 47 # ifndef VLNEXT 48 cc_t termLiteralNextChar; 49 # endif 50 # ifndef VWERASE 51 cc_t termWerasChar; 52 # endif 53 # ifndef VREPRINT 54 cc_t termRprntChar; 55 # endif 56 # ifndef VSTART 57 cc_t termStartChar; 58 # endif 59 # ifndef VSTOP 60 cc_t termStopChar; 61 # endif 62 # ifndef VEOL 63 cc_t termForw1Char; 64 # endif 65 # ifndef VEOL2 66 cc_t termForw2Char; 67 # endif 68 # ifndef VSTATUS 69 cc_t termAytChar; 70 # endif 71 72 /* 73 * initialize the terminal data structures. 74 */ 75 76 void 77 init_terminal(void) 78 { 79 struct termios tc; 80 81 ring_init(&ttyoring, ttyobuf, sizeof ttyobuf); 82 ring_init(&ttyiring, ttyibuf, sizeof ttyibuf); 83 84 tcgetattr(0, &tc); 85 autoflush = (tc.c_lflag & NOFLSH) == 0; 86 } 87 88 /* 89 * Send as much data as possible to the terminal. 90 * 91 * Return value: 92 * -1: No useful work done, data waiting to go out. 93 * 0: No data was waiting, so nothing was done. 94 * 1: All waiting data was written out. 95 * n: All data - n was written out. 96 */ 97 98 int 99 ttyflush(int drop) 100 { 101 int n, n0, n1; 102 103 n0 = ring_full_count(&ttyoring); 104 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 105 if (drop) { 106 tcflush(fileno(stdout), TCOFLUSH); 107 /* we leave 'n' alone! */ 108 } else { 109 n = write(tout, ttyoring.consume, n); 110 } 111 } 112 if (n > 0) { 113 if (termdata && n) { 114 Dump('>', ttyoring.consume, n); 115 } 116 /* 117 * If we wrote everything, and the full count is 118 * larger than what we wrote, then write the 119 * rest of the buffer. 120 */ 121 if (n1 == n && n0 > n) { 122 n1 = n0 - n; 123 if (!drop) 124 n1 = write(tout, ttyoring.bottom, n1); 125 if (n1 > 0) 126 n += n1; 127 } 128 ring_consumed(&ttyoring, n); 129 } 130 if (n < 0) { 131 if (errno == EPIPE) 132 kill(0, SIGQUIT); 133 return -1; 134 } 135 if (n == n0) { 136 if (n0) 137 return -1; 138 return 0; 139 } 140 return n0 - n + 1; 141 } 142 143 144 /* 145 * These routines decides on what the mode should be (based on the values 146 * of various global variables). 147 */ 148 149 int 150 getconnmode(void) 151 { 152 int mode = 0; 153 154 if (my_want_state_is_dont(TELOPT_ECHO)) 155 mode |= MODE_ECHO; 156 157 if (localflow) 158 mode |= MODE_FLOW; 159 160 if ((eight & 1) || my_want_state_is_will(TELOPT_BINARY)) 161 mode |= MODE_INBIN; 162 163 if (eight & 2) 164 mode |= MODE_OUT8; 165 if (his_want_state_is_will(TELOPT_BINARY)) 166 mode |= MODE_OUTBIN; 167 168 #ifdef KLUDGELINEMODE 169 if (kludgelinemode) { 170 if (my_want_state_is_dont(TELOPT_SGA)) { 171 mode |= (MODE_TRAPSIG|MODE_EDIT); 172 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) { 173 mode &= ~MODE_ECHO; 174 } 175 } 176 return(mode); 177 } 178 #endif 179 if (my_want_state_is_will(TELOPT_LINEMODE)) 180 mode |= linemode; 181 return(mode); 182 } 183 184 void 185 setconnmode(int force) 186 { 187 int newmode; 188 189 newmode = getconnmode()|(force?MODE_FORCE:0); 190 191 TerminalNewMode(newmode); 192 } 193 194 void 195 setcommandmode(void) 196 { 197 TerminalNewMode(-1); 198 } 199