crypto/heimdal-0.6.3/appl/telnet/telnet/utilities.c

   1 /*
   2  * Copyright (c) 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #define TELOPTS
  35 #define TELCMDS
  36 #define SLC_NAMES
  37
  38 #include "telnet_locl.h"
  39
  40 RCSID("$Id: utilities.c,v 1.25 2001/08/29 00:45:21 assar Exp $");
  41
  42 FILE    *NetTrace = 0;          /* Not in bss, since needs to stay */
  43 int     prettydump;
  44
  45 /*
  46  * SetSockOpt()
  47  *
  48  * Compensate for differences in 4.2 and 4.3 systems.
  49  */
  50
  51 int
  52 SetSockOpt(int fd, int level, int option, int yesno)
  53 {
  54 #ifdef HAVE_SETSOCKOPT
  55 #ifndef NOT43
  56     return setsockopt(fd, level, option,
  57                                 (void *)&yesno, sizeof yesno);
  58 #else   /* NOT43 */
  59     if (yesno == 0) {           /* Can't do that in 4.2! */
  60         fprintf(stderr, "Error: attempt to turn off an option 0x%x.\n",
  61                                 option);
  62         return -1;
  63     }
  64     return setsockopt(fd, level, option, 0, 0);
  65 #endif  /* NOT43 */
  66 #else
  67     return -1;
  68 #endif
  69 }
  70 \f
  71 /*
  72  * The following are routines used to print out debugging information.
  73  */
  74
  75 char NetTraceFile[256] = "(standard output)";
  76
  77 void
  78 SetNetTrace(char *file)
  79 {
  80     if (NetTrace && NetTrace != stdout)
  81         fclose(NetTrace);
  82     if (file  && (strcmp(file, "-") != 0)) {
  83         NetTrace = fopen(file, "w");
  84         if (NetTrace) {
  85             strlcpy(NetTraceFile, file, sizeof(NetTraceFile));
  86             return;
  87         }
  88         fprintf(stderr, "Cannot open %s.\n", file);
  89     }
  90     NetTrace = stdout;
  91     strlcpy(NetTraceFile, "(standard output)", sizeof(NetTraceFile));
  92 }
  93
  94 void
  95 Dump(char direction, unsigned char *buffer, int length)
  96 {
  97 #   define BYTES_PER_LINE       32
  98     unsigned char *pThis;
  99     int offset;
 100
 101     offset = 0;
 102
 103     while (length) {
 104         /* print one line */
 105         fprintf(NetTrace, "%c 0x%x\t", direction, offset);
 106         pThis = buffer;
 107         if (prettydump) {
 108             buffer = buffer + min(length, BYTES_PER_LINE/2);
 109             while (pThis < buffer) {
 110                 fprintf(NetTrace, "%c%.2x",
 111                     (((*pThis)&0xff) == 0xff) ? '*' : ' ',
 112                     (*pThis)&0xff);
 113                 pThis++;
 114             }
 115             length -= BYTES_PER_LINE/2;
 116             offset += BYTES_PER_LINE/2;
 117         } else {
 118             buffer = buffer + min(length, BYTES_PER_LINE);
 119             while (pThis < buffer) {
 120                 fprintf(NetTrace, "%.2x", (*pThis)&0xff);
 121                 pThis++;
 122             }
 123             length -= BYTES_PER_LINE;
 124             offset += BYTES_PER_LINE;
 125         }
 126         if (NetTrace == stdout) {
 127             fprintf(NetTrace, "\r\n");
 128         } else {
 129             fprintf(NetTrace, "\n");
 130         }
 131         if (length < 0) {
 132             fflush(NetTrace);
 133             return;
 134         }
 135         /* find next unique line */
 136     }
 137     fflush(NetTrace);
 138 }
 139
 140
 141 void
 142 printoption(char *direction, int cmd, int option)
 143 {
 144         if (!showoptions)
 145                 return;
 146         if (cmd == IAC) {
 147                 if (TELCMD_OK(option))
 148                     fprintf(NetTrace, "%s IAC %s", direction, TELCMD(option));
 149                 else
 150                     fprintf(NetTrace, "%s IAC %d", direction, option);
 151         } else {
 152                 char *fmt;
 153                 fmt = (cmd == WILL) ? "WILL" : (cmd == WONT) ? "WONT" :
 154                         (cmd == DO) ? "DO" : (cmd == DONT) ? "DONT" : 0;
 155                 if (fmt) {
 156                     fprintf(NetTrace, "%s %s ", direction, fmt);
 157                     if (TELOPT_OK(option))
 158                         fprintf(NetTrace, "%s", TELOPT(option));
 159                     else if (option == TELOPT_EXOPL)
 160                         fprintf(NetTrace, "EXOPL");
 161                     else
 162                         fprintf(NetTrace, "%d", option);
 163                 } else
 164                     fprintf(NetTrace, "%s %d %d", direction, cmd, option);
 165         }
 166         if (NetTrace == stdout) {
 167             fprintf(NetTrace, "\r\n");
 168             fflush(NetTrace);
 169         } else {
 170             fprintf(NetTrace, "\n");
 171         }
 172         return;
 173 }
 174
 175 void
 176 optionstatus(void)
 177 {
 178     int i;
 179
 180     for (i = 0; i < 256; i++) {
 181         if (do_dont_resp[i]) {
 182             if (TELOPT_OK(i))
 183                 printf("resp DO_DONT %s: %d\n", TELOPT(i), do_dont_resp[i]);
 184             else if (TELCMD_OK(i))
 185                 printf("resp DO_DONT %s: %d\n", TELCMD(i), do_dont_resp[i]);
 186             else
 187                 printf("resp DO_DONT %d: %d\n", i,
 188                                 do_dont_resp[i]);
 189             if (my_want_state_is_do(i)) {
 190                 if (TELOPT_OK(i))
 191                     printf("want DO   %s\n", TELOPT(i));
 192                 else if (TELCMD_OK(i))
 193                     printf("want DO   %s\n", TELCMD(i));
 194                 else
 195                     printf("want DO   %d\n", i);
 196             } else {
 197                 if (TELOPT_OK(i))
 198                     printf("want DONT %s\n", TELOPT(i));
 199                 else if (TELCMD_OK(i))
 200                     printf("want DONT %s\n", TELCMD(i));
 201                 else
 202                     printf("want DONT %d\n", i);
 203             }
 204         } else {
 205             if (my_state_is_do(i)) {
 206                 if (TELOPT_OK(i))
 207                     printf("     DO   %s\n", TELOPT(i));
 208                 else if (TELCMD_OK(i))
 209                     printf("     DO   %s\n", TELCMD(i));
 210                 else
 211                     printf("     DO   %d\n", i);
 212             }
 213         }
 214         if (will_wont_resp[i]) {
 215             if (TELOPT_OK(i))
 216                 printf("resp WILL_WONT %s: %d\n", TELOPT(i), will_wont_resp[i]);
 217             else if (TELCMD_OK(i))
 218                 printf("resp WILL_WONT %s: %d\n", TELCMD(i), will_wont_resp[i]);
 219             else
 220                 printf("resp WILL_WONT %d: %d\n",
 221                                 i, will_wont_resp[i]);
 222             if (my_want_state_is_will(i)) {
 223                 if (TELOPT_OK(i))
 224                     printf("want WILL %s\n", TELOPT(i));
 225                 else if (TELCMD_OK(i))
 226                     printf("want WILL %s\n", TELCMD(i));
 227                 else
 228                     printf("want WILL %d\n", i);
 229             } else {
 230                 if (TELOPT_OK(i))
 231                     printf("want WONT %s\n", TELOPT(i));
 232                 else if (TELCMD_OK(i))
 233                     printf("want WONT %s\n", TELCMD(i));
 234                 else
 235                     printf("want WONT %d\n", i);
 236             }
 237         } else {
 238             if (my_state_is_will(i)) {
 239                 if (TELOPT_OK(i))
 240                     printf("     WILL %s\n", TELOPT(i));
 241                 else if (TELCMD_OK(i))
 242                     printf("     WILL %s\n", TELCMD(i));
 243                 else
 244                     printf("     WILL %d\n", i);
 245             }
 246         }
 247     }
 248
 249 }
 250
 251 void
 252 printsub(int direction, unsigned char *pointer, int length)
 253 {
 254     int i;
 255     unsigned char buf[512];
 256
 257     if (showoptions || direction == 0 ||
 258         (want_status_response && (pointer[0] == TELOPT_STATUS))) {
 259         if (direction) {
 260             fprintf(NetTrace, "%s IAC SB ",
 261                                 (direction == '<')? "RCVD":"SENT");
 262             if (length >= 3) {
 263                 int j;
 264
 265                 i = pointer[length-2];
 266                 j = pointer[length-1];
 267
 268                 if (i != IAC || j != SE) {
 269                     fprintf(NetTrace, "(terminated by ");
 270                     if (TELOPT_OK(i))
 271                         fprintf(NetTrace, "%s ", TELOPT(i));
 272                     else if (TELCMD_OK(i))
 273                         fprintf(NetTrace, "%s ", TELCMD(i));
 274                     else
 275                         fprintf(NetTrace, "%d ", i);
 276                     if (TELOPT_OK(j))
 277                         fprintf(NetTrace, "%s", TELOPT(j));
 278                     else if (TELCMD_OK(j))
 279                         fprintf(NetTrace, "%s", TELCMD(j));
 280                     else
 281                         fprintf(NetTrace, "%d", j);
 282                     fprintf(NetTrace, ", not IAC SE!) ");
 283                 }
 284             }
 285             length -= 2;
 286         }
 287         if (length < 1) {
 288             fprintf(NetTrace, "(Empty suboption??\?)");
 289             if (NetTrace == stdout)
 290                 fflush(NetTrace);
 291             return;
 292         }
 293         switch (pointer[0]) {
 294         case TELOPT_TTYPE:
 295             fprintf(NetTrace, "TERMINAL-TYPE ");
 296             switch (pointer[1]) {
 297             case TELQUAL_IS:
 298                 fprintf(NetTrace, "IS \"%.*s\"", length-2, (char *)pointer+2);
 299                 break;
 300             case TELQUAL_SEND:
 301                 fprintf(NetTrace, "SEND");
 302                 break;
 303             default:
 304                 fprintf(NetTrace,
 305                                 "- unknown qualifier %d (0x%x).",
 306                                 pointer[1], pointer[1]);
 307             }
 308             break;
 309         case TELOPT_TSPEED:
 310             fprintf(NetTrace, "TERMINAL-SPEED");
 311             if (length < 2) {
 312                 fprintf(NetTrace, " (empty suboption??\?)");
 313                 break;
 314             }
 315             switch (pointer[1]) {
 316             case TELQUAL_IS:
 317                 fprintf(NetTrace, " IS ");
 318                 fprintf(NetTrace, "%.*s", length-2, (char *)pointer+2);
 319                 break;
 320             default:
 321                 if (pointer[1] == 1)
 322                     fprintf(NetTrace, " SEND");
 323                 else
 324                     fprintf(NetTrace, " %d (unknown)", pointer[1]);
 325                 for (i = 2; i < length; i++)
 326                     fprintf(NetTrace, " ?%d?", pointer[i]);
 327                 break;
 328             }
 329             break;
 330
 331         case TELOPT_LFLOW:
 332             fprintf(NetTrace, "TOGGLE-FLOW-CONTROL");
 333             if (length < 2) {
 334                 fprintf(NetTrace, " (empty suboption??\?)");
 335                 break;
 336             }
 337             switch (pointer[1]) {
 338             case LFLOW_OFF:
 339                 fprintf(NetTrace, " OFF"); break;
 340             case LFLOW_ON:
 341                 fprintf(NetTrace, " ON"); break;
 342             case LFLOW_RESTART_ANY:
 343                 fprintf(NetTrace, " RESTART-ANY"); break;
 344             case LFLOW_RESTART_XON:
 345                 fprintf(NetTrace, " RESTART-XON"); break;
 346             default:
 347                 fprintf(NetTrace, " %d (unknown)", pointer[1]);
 348             }
 349             for (i = 2; i < length; i++)
 350                 fprintf(NetTrace, " ?%d?", pointer[i]);
 351             break;
 352
 353         case TELOPT_NAWS:
 354             fprintf(NetTrace, "NAWS");
 355             if (length < 2) {
 356                 fprintf(NetTrace, " (empty suboption??\?)");
 357                 break;
 358             }
 359             if (length == 2) {
 360                 fprintf(NetTrace, " ?%d?", pointer[1]);
 361                 break;
 362             }
 363             fprintf(NetTrace, " %d %d (%d)",
 364                 pointer[1], pointer[2],
 365                 (int)((((unsigned int)pointer[1])<<8)|((unsigned int)pointer[2])));
 366             if (length == 4) {
 367                 fprintf(NetTrace, " ?%d?", pointer[3]);
 368                 break;
 369             }
 370             fprintf(NetTrace, " %d %d (%d)",
 371                 pointer[3], pointer[4],
 372                 (int)((((unsigned int)pointer[3])<<8)|((unsigned int)pointer[4])));
 373             for (i = 5; i < length; i++)
 374                 fprintf(NetTrace, " ?%d?", pointer[i]);
 375             break;
 376
 377 #if     defined(AUTHENTICATION)
 378         case TELOPT_AUTHENTICATION:
 379             fprintf(NetTrace, "AUTHENTICATION");
 380             if (length < 2) {
 381                 fprintf(NetTrace, " (empty suboption??\?)");
 382                 break;
 383             }
 384             switch (pointer[1]) {
 385             case TELQUAL_REPLY:
 386             case TELQUAL_IS:
 387                 fprintf(NetTrace, " %s ", (pointer[1] == TELQUAL_IS) ?
 388                                                         "IS" : "REPLY");
 389                 if (AUTHTYPE_NAME_OK(pointer[2]))
 390                     fprintf(NetTrace, "%s ", AUTHTYPE_NAME(pointer[2]));
 391                 else
 392                     fprintf(NetTrace, "%d ", pointer[2]);
 393                 if (length < 3) {
 394                     fprintf(NetTrace, "(partial suboption??\?)");
 395                     break;
 396                 }
 397                 fprintf(NetTrace, "%s|%s",
 398                         ((pointer[3] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
 399                         "CLIENT" : "SERVER",
 400                         ((pointer[3] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
 401                         "MUTUAL" : "ONE-WAY");
 402
 403                 auth_printsub(&pointer[1], length - 1, buf, sizeof(buf));
 404                 fprintf(NetTrace, "%s", buf);
 405                 break;
 406
 407             case TELQUAL_SEND:
 408                 i = 2;
 409                 fprintf(NetTrace, " SEND ");
 410                 while (i < length) {
 411                     if (AUTHTYPE_NAME_OK(pointer[i]))
 412                         fprintf(NetTrace, "%s ", AUTHTYPE_NAME(pointer[i]));
 413                     else
 414                         fprintf(NetTrace, "%d ", pointer[i]);
 415                     if (++i >= length) {
 416                         fprintf(NetTrace, "(partial suboption??\?)");
 417                         break;
 418                     }
 419                     fprintf(NetTrace, "%s|%s ",
 420                         ((pointer[i] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
 421                                                         "CLIENT" : "SERVER",
 422                         ((pointer[i] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
 423                                                         "MUTUAL" : "ONE-WAY");
 424                     ++i;
 425                 }
 426                 break;
 427
 428             case TELQUAL_NAME:
 429                 i = 2;
 430                 fprintf(NetTrace, " NAME \"");
 431                 while (i < length)
 432                     putc(pointer[i++], NetTrace);
 433                 putc('"', NetTrace);
 434                 break;
 435
 436             default:
 437                     for (i = 2; i < length; i++)
 438                         fprintf(NetTrace, " ?%d?", pointer[i]);
 439                     break;
 440             }
 441             break;
 442 #endif
 443
 444 #if     defined(ENCRYPTION)
 445         case TELOPT_ENCRYPT:
 446             fprintf(NetTrace, "ENCRYPT");
 447             if (length < 2) {
 448                 fprintf(NetTrace, " (empty suboption?)");
 449                 break;
 450             }
 451             switch (pointer[1]) {
 452             case ENCRYPT_START:
 453                 fprintf(NetTrace, " START");
 454                 break;
 455
 456             case ENCRYPT_END:
 457                 fprintf(NetTrace, " END");
 458                 break;
 459
 460             case ENCRYPT_REQSTART:
 461                 fprintf(NetTrace, " REQUEST-START");
 462                 break;
 463
 464             case ENCRYPT_REQEND:
 465                 fprintf(NetTrace, " REQUEST-END");
 466                 break;
 467
 468             case ENCRYPT_IS:
 469             case ENCRYPT_REPLY:
 470                 fprintf(NetTrace, " %s ", (pointer[1] == ENCRYPT_IS) ?
 471                                                         "IS" : "REPLY");
 472                 if (length < 3) {
 473                     fprintf(NetTrace, " (partial suboption?)");
 474                     break;
 475                 }
 476                 if (ENCTYPE_NAME_OK(pointer[2]))
 477                     fprintf(NetTrace, "%s ", ENCTYPE_NAME(pointer[2]));
 478                 else
 479                     fprintf(NetTrace, " %d (unknown)", pointer[2]);
 480
 481                 encrypt_printsub(&pointer[1], length - 1, buf, sizeof(buf));
 482                 fprintf(NetTrace, "%s", buf);
 483                 break;
 484
 485             case ENCRYPT_SUPPORT:
 486                 i = 2;
 487                 fprintf(NetTrace, " SUPPORT ");
 488                 while (i < length) {
 489                     if (ENCTYPE_NAME_OK(pointer[i]))
 490                         fprintf(NetTrace, "%s ", ENCTYPE_NAME(pointer[i]));
 491                     else
 492                         fprintf(NetTrace, "%d ", pointer[i]);
 493                     i++;
 494                 }
 495                 break;
 496
 497             case ENCRYPT_ENC_KEYID:
 498                 fprintf(NetTrace, " ENC_KEYID ");
 499                 goto encommon;
 500
 501             case ENCRYPT_DEC_KEYID:
 502                 fprintf(NetTrace, " DEC_KEYID ");
 503                 goto encommon;
 504
 505             default:
 506                 fprintf(NetTrace, " %d (unknown)", pointer[1]);
 507             encommon:
 508                 for (i = 2; i < length; i++)
 509                     fprintf(NetTrace, " %d", pointer[i]);
 510                 break;
 511             }
 512             break;
 513 #endif
 514
 515         case TELOPT_LINEMODE:
 516             fprintf(NetTrace, "LINEMODE ");
 517             if (length < 2) {
 518                 fprintf(NetTrace, " (empty suboption??\?)");
 519                 break;
 520             }
 521             switch (pointer[1]) {
 522             case WILL:
 523                 fprintf(NetTrace, "WILL ");
 524                 goto common;
 525             case WONT:
 526                 fprintf(NetTrace, "WONT ");
 527                 goto common;
 528             case DO:
 529                 fprintf(NetTrace, "DO ");
 530                 goto common;
 531             case DONT:
 532                 fprintf(NetTrace, "DONT ");
 533             common:
 534                 if (length < 3) {
 535                     fprintf(NetTrace, "(no option??\?)");
 536                     break;
 537                 }
 538                 switch (pointer[2]) {
 539                 case LM_FORWARDMASK:
 540                     fprintf(NetTrace, "Forward Mask");
 541                     for (i = 3; i < length; i++)
 542                         fprintf(NetTrace, " %x", pointer[i]);
 543                     break;
 544                 default:
 545                     fprintf(NetTrace, "%d (unknown)", pointer[2]);
 546                     for (i = 3; i < length; i++)
 547                         fprintf(NetTrace, " %d", pointer[i]);
 548                     break;
 549                 }
 550                 break;
 551
 552             case LM_SLC:
 553                 fprintf(NetTrace, "SLC");
 554                 for (i = 2; i < length - 2; i += 3) {
 555                     if (SLC_NAME_OK(pointer[i+SLC_FUNC]))
 556                         fprintf(NetTrace, " %s", SLC_NAME(pointer[i+SLC_FUNC]));
 557                     else
 558                         fprintf(NetTrace, " %d", pointer[i+SLC_FUNC]);
 559                     switch (pointer[i+SLC_FLAGS]&SLC_LEVELBITS) {
 560                     case SLC_NOSUPPORT:
 561                         fprintf(NetTrace, " NOSUPPORT"); break;
 562                     case SLC_CANTCHANGE:
 563                         fprintf(NetTrace, " CANTCHANGE"); break;
 564                     case SLC_VARIABLE:
 565                         fprintf(NetTrace, " VARIABLE"); break;
 566                     case SLC_DEFAULT:
 567                         fprintf(NetTrace, " DEFAULT"); break;
 568                     }
 569                     fprintf(NetTrace, "%s%s%s",
 570                         pointer[i+SLC_FLAGS]&SLC_ACK ? "|ACK" : "",
 571                         pointer[i+SLC_FLAGS]&SLC_FLUSHIN ? "|FLUSHIN" : "",
 572                         pointer[i+SLC_FLAGS]&SLC_FLUSHOUT ? "|FLUSHOUT" : "");
 573                     if (pointer[i+SLC_FLAGS]& ~(SLC_ACK|SLC_FLUSHIN|
 574                                                 SLC_FLUSHOUT| SLC_LEVELBITS))
 575                         fprintf(NetTrace, "(0x%x)", pointer[i+SLC_FLAGS]);
 576                     fprintf(NetTrace, " %d;", pointer[i+SLC_VALUE]);
 577                     if ((pointer[i+SLC_VALUE] == IAC) &&
 578                         (pointer[i+SLC_VALUE+1] == IAC))
 579                                 i++;
 580                 }
 581                 for (; i < length; i++)
 582                     fprintf(NetTrace, " ?%d?", pointer[i]);
 583                 break;
 584
 585             case LM_MODE:
 586                 fprintf(NetTrace, "MODE ");
 587                 if (length < 3) {
 588                     fprintf(NetTrace, "(no mode??\?)");
 589                     break;
 590                 }
 591                 {
 592                     char tbuf[64];
 593                     snprintf(tbuf, sizeof(tbuf),
 594                              "%s%s%s%s%s",
 595                              pointer[2]&MODE_EDIT ? "|EDIT" : "",
 596                              pointer[2]&MODE_TRAPSIG ? "|TRAPSIG" : "",
 597                              pointer[2]&MODE_SOFT_TAB ? "|SOFT_TAB" : "",
 598                              pointer[2]&MODE_LIT_ECHO ? "|LIT_ECHO" : "",
 599                              pointer[2]&MODE_ACK ? "|ACK" : "");
 600                     fprintf(NetTrace, "%s", tbuf[1] ? &tbuf[1] : "0");
 601                 }
 602                 if (pointer[2]&~(MODE_MASK))
 603                     fprintf(NetTrace, " (0x%x)", pointer[2]);
 604                 for (i = 3; i < length; i++)
 605                     fprintf(NetTrace, " ?0x%x?", pointer[i]);
 606                 break;
 607             default:
 608                 fprintf(NetTrace, "%d (unknown)", pointer[1]);
 609                 for (i = 2; i < length; i++)
 610                     fprintf(NetTrace, " %d", pointer[i]);
 611             }
 612             break;
 613
 614         case TELOPT_STATUS: {
 615             char *cp;
 616             int j, k;
 617
 618             fprintf(NetTrace, "STATUS");
 619
 620             switch (pointer[1]) {
 621             default:
 622                 if (pointer[1] == TELQUAL_SEND)
 623                     fprintf(NetTrace, " SEND");
 624                 else
 625                     fprintf(NetTrace, " %d (unknown)", pointer[1]);
 626                 for (i = 2; i < length; i++)
 627                     fprintf(NetTrace, " ?%d?", pointer[i]);
 628                 break;
 629             case TELQUAL_IS:
 630                 if (--want_status_response < 0)
 631                     want_status_response = 0;
 632                 if (NetTrace == stdout)
 633                     fprintf(NetTrace, " IS\r\n");
 634                 else
 635                     fprintf(NetTrace, " IS\n");
 636
 637                 for (i = 2; i < length; i++) {
 638                     switch(pointer[i]) {
 639                     case DO:    cp = "DO"; goto common2;
 640                     case DONT:  cp = "DONT"; goto common2;
 641                     case WILL:  cp = "WILL"; goto common2;
 642                     case WONT:  cp = "WONT"; goto common2;
 643                     common2:
 644                         i++;
 645                         if (TELOPT_OK((int)pointer[i]))
 646                             fprintf(NetTrace, " %s %s", cp, TELOPT(pointer[i]));
 647                         else
 648                             fprintf(NetTrace, " %s %d", cp, pointer[i]);
 649
 650                         if (NetTrace == stdout)
 651                             fprintf(NetTrace, "\r\n");
 652                         else
 653                             fprintf(NetTrace, "\n");
 654                         break;
 655
 656                     case SB:
 657                         fprintf(NetTrace, " SB ");
 658                         i++;
 659                         j = k = i;
 660                         while (j < length) {
 661                             if (pointer[j] == SE) {
 662                                 if (j+1 == length)
 663                                     break;
 664                                 if (pointer[j+1] == SE)
 665                                     j++;
 666                                 else
 667                                     break;
 668                             }
 669                             pointer[k++] = pointer[j++];
 670                         }
 671                         printsub(0, &pointer[i], k - i);
 672                         if (i < length) {
 673                             fprintf(NetTrace, " SE");
 674                             i = j;
 675                         } else
 676                             i = j - 1;
 677
 678                         if (NetTrace == stdout)
 679                             fprintf(NetTrace, "\r\n");
 680                         else
 681                             fprintf(NetTrace, "\n");
 682
 683                         break;
 684
 685                     default:
 686                         fprintf(NetTrace, " %d", pointer[i]);
 687                         break;
 688                     }
 689                 }
 690                 break;
 691             }
 692             break;
 693           }
 694
 695         case TELOPT_XDISPLOC:
 696             fprintf(NetTrace, "X-DISPLAY-LOCATION ");
 697             switch (pointer[1]) {
 698             case TELQUAL_IS:
 699                 fprintf(NetTrace, "IS \"%.*s\"", length-2, (char *)pointer+2);
 700                 break;
 701             case TELQUAL_SEND:
 702                 fprintf(NetTrace, "SEND");
 703                 break;
 704             default:
 705                 fprintf(NetTrace, "- unknown qualifier %d (0x%x).",
 706                                 pointer[1], pointer[1]);
 707             }
 708             break;
 709
 710         case TELOPT_NEW_ENVIRON:
 711             fprintf(NetTrace, "NEW-ENVIRON ");
 712 #ifdef  OLD_ENVIRON
 713             goto env_common1;
 714         case TELOPT_OLD_ENVIRON:
 715             fprintf(NetTrace, "OLD-ENVIRON");
 716         env_common1:
 717 #endif
 718             switch (pointer[1]) {
 719             case TELQUAL_IS:
 720                 fprintf(NetTrace, "IS ");
 721                 goto env_common;
 722             case TELQUAL_SEND:
 723                 fprintf(NetTrace, "SEND ");
 724                 goto env_common;
 725             case TELQUAL_INFO:
 726                 fprintf(NetTrace, "INFO ");
 727             env_common:
 728                 {
 729                     int noquote = 2;
 730                     for (i = 2; i < length; i++ ) {
 731                         switch (pointer[i]) {
 732                         case NEW_ENV_VALUE:
 733 #ifdef OLD_ENVIRON
 734                      /* case NEW_ENV_OVAR: */
 735                             if (pointer[0] == TELOPT_OLD_ENVIRON) {
 736                                     fprintf(NetTrace, "\" VAR " + noquote);
 737                             } else
 738 #endif /* OLD_ENVIRON */
 739                                 fprintf(NetTrace, "\" VALUE " + noquote);
 740                             noquote = 2;
 741                             break;
 742
 743                         case NEW_ENV_VAR:
 744 #ifdef OLD_ENVIRON
 745                      /* case OLD_ENV_VALUE: */
 746                             if (pointer[0] == TELOPT_OLD_ENVIRON) {
 747                                     fprintf(NetTrace, "\" VALUE " + noquote);
 748                             } else
 749 #endif /* OLD_ENVIRON */
 750                                 fprintf(NetTrace, "\" VAR " + noquote);
 751                             noquote = 2;
 752                             break;
 753
 754                         case ENV_ESC:
 755                             fprintf(NetTrace, "\" ESC " + noquote);
 756                             noquote = 2;
 757                             break;
 758
 759                         case ENV_USERVAR:
 760                             fprintf(NetTrace, "\" USERVAR " + noquote);
 761                             noquote = 2;
 762                             break;
 763
 764                         default:
 765                             if (isprint(pointer[i]) && pointer[i] != '"') {
 766                                 if (noquote) {
 767                                     putc('"', NetTrace);
 768                                     noquote = 0;
 769                                 }
 770                                 putc(pointer[i], NetTrace);
 771                             } else {
 772                                 fprintf(NetTrace, "\" %03o " + noquote,
 773                                                         pointer[i]);
 774                                 noquote = 2;
 775                             }
 776                             break;
 777                         }
 778                     }
 779                     if (!noquote)
 780                         putc('"', NetTrace);
 781                     break;
 782                 }
 783             }
 784             break;
 785
 786         default:
 787             if (TELOPT_OK(pointer[0]))
 788                 fprintf(NetTrace, "%s (unknown)", TELOPT(pointer[0]));
 789             else
 790                 fprintf(NetTrace, "%d (unknown)", pointer[0]);
 791             for (i = 1; i < length; i++)
 792                 fprintf(NetTrace, " %d", pointer[i]);
 793             break;
 794         }
 795         if (direction) {
 796             if (NetTrace == stdout)
 797                 fprintf(NetTrace, "\r\n");
 798             else
 799                 fprintf(NetTrace, "\n");
 800         }
 801         if (NetTrace == stdout)
 802             fflush(NetTrace);
 803     }
 804 }
 805
 806 /* EmptyTerminal - called to make sure that the terminal buffer is empty.
 807  *                      Note that we consider the buffer to run all the
 808  *                      way to the kernel (thus the select).
 809  */
 810
 811 void
 812 EmptyTerminal(void)
 813 {
 814     fd_set      outs;
 815
 816     FD_ZERO(&outs);
 817
 818     if (tout >= FD_SETSIZE)
 819         ExitString("fd too large", 1);
 820
 821     if (TTYBYTES() == 0) {
 822         FD_SET(tout, &outs);
 823         select(tout+1, 0, &outs, 0,
 824                       (struct timeval *) 0); /* wait for TTLOWAT */
 825     } else {
 826         while (TTYBYTES()) {
 827             ttyflush(0);
 828             FD_SET(tout, &outs);
 829             select(tout+1, 0, &outs, 0,
 830                           (struct timeval *) 0); /* wait for TTLOWAT */
 831         }
 832     }
 833 }
 834
 835 void
 836 SetForExit(void)
 837 {
 838     setconnmode(0);
 839     do {
 840         telrcv();                       /* Process any incoming data */
 841         EmptyTerminal();
 842     } while (ring_full_count(&netiring));       /* While there is any */
 843     setcommandmode();
 844     fflush(stdout);
 845     fflush(stderr);
 846     setconnmode(0);
 847     EmptyTerminal();                    /* Flush the path to the tty */
 848     setcommandmode();
 849 }
 850
 851 void
 852 Exit(int returnCode)
 853 {
 854     SetForExit();
 855     exit(returnCode);
 856 }
 857
 858 void
 859 ExitString(char *string, int returnCode)
 860 {
 861     SetForExit();
 862     fwrite(string, 1, strlen(string), stderr);
 863     exit(returnCode);
 864 }