1 /* $OpenBSD: terminal.c,v 1.14 2017/07/07 09:14:26 fcambus 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 /* 45 * initialize the terminal data structures. 46 */ 47 48 void 49 init_terminal(void) 50 { 51 struct termios tc; 52 53 ring_init(&ttyoring, ttyobuf, sizeof ttyobuf); 54 ring_init(&ttyiring, ttyibuf, sizeof ttyibuf); 55 56 tcgetattr(0, &tc); 57 autoflush = (tc.c_lflag & NOFLSH) == 0; 58 } 59 60 /* 61 * Send as much data as possible to the terminal. 62 * 63 * Return value: 64 * -1: No useful work done, data waiting to go out. 65 * 0: No data was waiting, so nothing was done. 66 * 1: All waiting data was written out. 67 * n: All data - n was written out. 68 */ 69 70 int 71 ttyflush(int drop) 72 { 73 int n, n0, n1; 74 75 n0 = ring_full_count(&ttyoring); 76 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 77 if (drop) { 78 tcflush(fileno(stdout), TCOFLUSH); 79 /* we leave 'n' alone! */ 80 } else { 81 n = write(tout, ttyoring.consume, n); 82 } 83 } 84 if (n > 0) { 85 if (termdata && n) { 86 Dump('>', ttyoring.consume, n); 87 } 88 /* 89 * If we wrote everything, and the full count is 90 * larger than what we wrote, then write the 91 * rest of the buffer. 92 */ 93 if (n1 == n && n0 > n) { 94 n1 = n0 - n; 95 if (!drop) 96 n1 = write(tout, ttyoring.bottom, n1); 97 if (n1 > 0) 98 n += n1; 99 } 100 ring_consumed(&ttyoring, n); 101 } 102 if (n < 0) { 103 if (errno == EPIPE) 104 kill(0, SIGQUIT); 105 return -1; 106 } 107 if (n == n0) { 108 if (n0) 109 return -1; 110 return 0; 111 } 112 return n0 - n + 1; 113 } 114 115 116 /* 117 * These routines decides on what the mode should be (based on the values 118 * of various global variables). 119 */ 120 121 int 122 getconnmode(void) 123 { 124 int mode = 0; 125 126 if (my_want_state_is_dont(TELOPT_ECHO)) 127 mode |= MODE_ECHO; 128 129 if (localflow) 130 mode |= MODE_FLOW; 131 132 if ((eight & 1) || my_want_state_is_will(TELOPT_BINARY)) 133 mode |= MODE_INBIN; 134 135 if (eight & 2) 136 mode |= MODE_OUT8; 137 if (his_want_state_is_will(TELOPT_BINARY)) 138 mode |= MODE_OUTBIN; 139 140 #ifdef KLUDGELINEMODE 141 if (kludgelinemode) { 142 if (my_want_state_is_dont(TELOPT_SGA)) { 143 mode |= (MODE_TRAPSIG|MODE_EDIT); 144 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) { 145 mode &= ~MODE_ECHO; 146 } 147 } 148 return(mode); 149 } 150 #endif 151 if (my_want_state_is_will(TELOPT_LINEMODE)) 152 mode |= linemode; 153 return(mode); 154 } 155 156 void 157 setconnmode(int force) 158 { 159 int newmode; 160 161 newmode = getconnmode()|(force?MODE_FORCE:0); 162 163 TerminalNewMode(newmode); 164 } 165 166 void 167 setcommandmode(void) 168 { 169 TerminalNewMode(-1); 170 } 171