1 /* $NetBSD: terminal.c,v 1.15 2005/02/19 23:28:41 christos 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 1.15 2005/02/19 23:28:41 christos 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 char line[] = { '\0' }; 56 57 int termdata; /* Debugging flag */ 58 59 /* 60 * initialize the terminal data structures. 61 */ 62 63 void 64 init_terminal(void) 65 { 66 if (ring_init(&ttyoring, ttyobuf, sizeof ttyobuf) != 1) { 67 exit(1); 68 } 69 if (ring_init(&ttyiring, ttyibuf, sizeof ttyibuf) != 1) { 70 exit(1); 71 } 72 autoflush = TerminalAutoFlush(); 73 } 74 75 76 /* 77 * Send as much data as possible to the terminal, else exits if 78 * it encounters a permanent failure when writing to the tty. 79 * 80 * Return value: 81 * -1: No useful work done, data waiting to go out. 82 * 0: No data was waiting, so nothing was done. 83 * 1: All waiting data was written out. 84 * n: All data - n was written out. 85 */ 86 87 88 int 89 ttyflush(int drop) 90 { 91 int n, n0, n1; 92 93 n0 = ring_full_count(&ttyoring); 94 if ((n1 = n = ring_full_consecutive(&ttyoring)) > 0) { 95 if (drop) { 96 TerminalFlushOutput(); 97 /* we leave 'n' alone! */ 98 } else { 99 n = TerminalWrite(ttyoring.consume, n); 100 } 101 } 102 if (n > 0) { 103 if (termdata && n) { 104 Dump('>', ttyoring.consume, n); 105 } 106 /* 107 * If we wrote everything, and the full count is 108 * larger than what we wrote, then write the 109 * rest of the buffer. 110 */ 111 if (n1 == n && n0 > n) { 112 n1 = n0 - n; 113 if (!drop) 114 n1 = TerminalWrite(ttyoring.bottom, n1); 115 if (n1 > 0) 116 n += n1; 117 } 118 ring_consumed(&ttyoring, n); 119 } 120 if (n < 0) { 121 if (errno == EAGAIN || errno == EINTR) { 122 return -1; 123 } else { 124 ring_consumed(&ttyoring, ring_full_count(&ttyoring)); 125 setconnmode(0); 126 setcommandmode(); 127 NetClose(net); 128 fprintf(stderr, "Connection closed by foreign host.\n"); 129 exit(1); 130 } 131 } 132 if (n == n0) { 133 if (n0) 134 return -1; 135 return 0; 136 } 137 return n0 - n + 1; 138 } 139 140 141 /* 142 * These routines decides on what the mode should be (based on the values 143 * of various global variables). 144 */ 145 146 147 int 148 getconnmode(void) 149 { 150 extern int linemode; 151 int mode = 0; 152 #ifdef KLUDGELINEMODE 153 extern int kludgelinemode; 154 #endif 155 156 if (In3270) 157 return(MODE_FLOW); 158 159 if (my_want_state_is_dont(TELOPT_ECHO)) 160 mode |= MODE_ECHO; 161 162 if (localflow) 163 mode |= MODE_FLOW; 164 165 if (my_want_state_is_will(TELOPT_BINARY)) 166 mode |= MODE_INBIN; 167 168 if (his_want_state_is_will(TELOPT_BINARY)) 169 mode |= MODE_OUTBIN; 170 171 #ifdef KLUDGELINEMODE 172 if (kludgelinemode) { 173 if (my_want_state_is_dont(TELOPT_SGA)) { 174 mode |= (MODE_TRAPSIG|MODE_EDIT); 175 if (dontlecho && (clocks.echotoggle > clocks.modenegotiated)) { 176 mode &= ~MODE_ECHO; 177 } 178 } 179 return(mode); 180 } 181 #endif 182 if (my_want_state_is_will(TELOPT_LINEMODE)) 183 mode |= linemode; 184 return(mode); 185 } 186 187 void 188 setconnmode(int force) 189 { 190 #ifdef ENCRYPTION 191 static int enc_passwd = 0; 192 #endif 193 int newmode; 194 195 newmode = getconnmode()|(force?MODE_FORCE:0); 196 197 TerminalNewMode(newmode); 198 199 #ifdef ENCRYPTION 200 if ((newmode & (MODE_ECHO|MODE_EDIT)) == MODE_EDIT) { 201 if (my_want_state_is_will(TELOPT_ENCRYPT) 202 && (enc_passwd == 0) && !encrypt_output) { 203 encrypt_request_start(0, 0); 204 enc_passwd = 1; 205 } 206 } else { 207 if (enc_passwd) { 208 encrypt_request_end(); 209 enc_passwd = 0; 210 } 211 } 212 #endif /* ENCRYPTION */ 213 } 214 215 216 void 217 setcommandmode(void) 218 { 219 TerminalNewMode(-1); 220 } 221