1 /* $NetBSD: terminal.c,v 1.14 2004/03/20 23:26:05 heas Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)terminal.c 8.2 (Berkeley) 2/16/95"; 36 #else 37 __RCSID("$NetBSD: terminal.c,v 1.14 2004/03/20 23:26:05 heas Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <arpa/telnet.h> 42 #include <sys/types.h> 43 44 #include "ring.h" 45 46 #include "externs.h" 47 #include "types.h" 48 49 #ifdef ENCRYPTION 50 #include <libtelnet/encrypt.h> 51 #endif 52 53 Ring ttyoring, ttyiring; 54 unsigned char ttyobuf[2*BUFSIZ], ttyibuf[BUFSIZ]; 55 56 int termdata; /* Debugging flag */ 57 58 /* 59 * initialize the terminal data structures. 60 */ 61 62 void 63 init_terminal(void) 64 { 65 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) { 66 exit(1); 67 } 68 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) { 69 exit(1); 70 } 71 autoflush = TerminalAutoFlush(); 72 } 73 74 75 /* 76 * Send as much data as possible to the terminal, else exits if 77 * it encounters a permanent failure when writing to the tty. 78 * 79 * Return value: 80 * -1: No useful work done, data waiting to go out. 81 * 0: No data was waiting, so nothing was done. 82 * 1: All waiting data was written out. 83 * n: All data - n was written out. 84 */ 85 86 87 int 88 ttyflush(int drop) 89 { 90 int n, n0, n1; 91 92 n0 = ring_full_count(&ttyoring); 93 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 94 if (drop) { 95 TerminalFlushOutput(); 96 /* we leave 'n' alone! */ 97 } else { 98 n = TerminalWrite(ttyoring.consume, n); 99 } 100 } 101 if (n > 0) { 102 if (termdata && n) { 103 Dump('>', ttyoring.consume, n); 104 } 105 /* 106 * If we wrote everything, and the full count is 107 * larger than what we wrote, then write the 108 * rest of the buffer. 109 */ 110 if (n1 == n && n0 > n) { 111 n1 = n0 - n; 112 if (!drop) 113 n1 = TerminalWrite(ttyoring.bottom, n1); 114 if (n1 > 0) 115 n += n1; 116 } 117 ring_consumed(&ttyoring, n); 118 } 119 if (n < 0) { 120 if (errno == EAGAIN || errno == EINTR) { 121 return -1; 122 } else { 123 ring_consumed(&ttyoring, ring_full_count(&ttyoring)); 124 setconnmode(0); 125 setcommandmode(); 126 NetClose(net); 127 fprintf(stderr, "Connection closed by foreign host.\n"); 128 exit(1); 129 } 130 } 131 if (n == n0) { 132 if (n0) 133 return -1; 134 return 0; 135 } 136 return n0 - n + 1; 137 } 138 139 140 /* 141 * These routines decides on what the mode should be (based on the values 142 * of various global variables). 143 */ 144 145 146 int 147 getconnmode(void) 148 { 149 extern int linemode; 150 int mode = 0; 151 #ifdef KLUDGELINEMODE 152 extern int kludgelinemode; 153 #endif 154 155 if (In3270) 156 return(MODE_FLOW); 157 158 if (my_want_state_is_dont(TELOPT_ECHO)) 159 mode |= MODE_ECHO; 160 161 if (localflow) 162 mode |= MODE_FLOW; 163 164 if (my_want_state_is_will(TELOPT_BINARY)) 165 mode |= MODE_INBIN; 166 167 if (his_want_state_is_will(TELOPT_BINARY)) 168 mode |= MODE_OUTBIN; 169 170 #ifdef KLUDGELINEMODE 171 if (kludgelinemode) { 172 if (my_want_state_is_dont(TELOPT_SGA)) { 173 mode |= (MODE_TRAPSIG|MODE_EDIT); 174 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) { 175 mode &= ~MODE_ECHO; 176 } 177 } 178 return(mode); 179 } 180 #endif 181 if (my_want_state_is_will(TELOPT_LINEMODE)) 182 mode |= linemode; 183 return(mode); 184 } 185 186 void 187 setconnmode(int force) 188 { 189 #ifdef ENCRYPTION 190 static int enc_passwd = 0; 191 #endif 192 int newmode; 193 194 newmode = getconnmode()|(force?MODE_FORCE:0); 195 196 TerminalNewMode(newmode); 197 198 #ifdef ENCRYPTION 199 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) { 200 if (my_want_state_is_will(TELOPT_ENCRYPT) 201 && (enc_passwd == 0) && !encrypt_output) { 202 encrypt_request_start(0, 0); 203 enc_passwd = 1; 204 } 205 } else { 206 if (enc_passwd) { 207 encrypt_request_end(); 208 enc_passwd = 0; 209 } 210 } 211 #endif /* ENCRYPTION */ 212 } 213 214 215 void 216 setcommandmode(void) 217 { 218 TerminalNewMode(-1); 219 } 220