/*
*
*
* Author: John D. Carlson
* Martin Hunt
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: johnc@cac.washington.edu
*
*
* Copyright 1992 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made
* available "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#ifndef lint
static char rcsid[] =
"@(#) $Header: /usr/staff/martinh/tcpview/RCS/telnet.c,v 1.1 1993/04/22 20:36:38 martinh Exp $ (UW)";
#endif
#include <stdio.h>
#include <sys/types.h>
int PrintFrames = 0; /* print headers ? */
int EndSub=1; /* begin/end subnegotiation */
int TType=0; /* request and response for terminal types */
#ifdef __STDC__
int getbyte(void);
u_short getword(void);
u_long getlword(void);
void processIAC(void);
void checksmallopts(void);
#else
int getbyte();
u_short getword();
u_long getlword();
void processIAC();
void checksmallopts();
#endif
main(argc, argv)
int argc;
char *argv[];
{
int c, i=0;
int type;
int length;
if( argc > 1 )
if( *argv[1]=='-' && argv[1][1]=='f' )
PrintFrames=1;
while( (c = getbyte()) != EOF) {
if( c=='\n' ) {
putchar('\n');
c = getbyte();
if( c=='\r' )
continue;
} else if( c=='\r' ) {
putchar('\n');
c = getbyte();
if( c=='\n')
continue;
}
if( c=='\t' )
putchar(c);
else if (c == 255) {
putchar('\n');
processIAC();
}
else { /* not IAC or subnegotiation must be c > 31 && c < 128 */
if (0 < c && c < 128)
putchar(c);
else
fprintf(stdout,"<%d>",c);
}
}
}
/* handle IAC stuff */
void processIAC()
{
int c;
c=getbyte();
switch (c) {
case 250: /* SB */
printf("<Start Subnegotiation 855>");
EndSub=0;
while (!EndSub) { /* keep looking until we find an end to subnegotiation */
checksmallopts();
}
break;
case 251: /* WILL */
printf("<WILL 854>");
checksmallopts();
break;
case 252: /* WONT */
printf("<WONT 854>");
checksmallopts();
break;
case 253: /* DO */
printf("<DO 854>");
checksmallopts();
break;
case 254: /* DONT */
printf("<DONT 854>");
checksmallopts();
break;
default: /* don't know what it is so indicate command */
if (c) /* if not null ie c == 0, then print it */
putchar(c);
}
}
/* need to handle option which are larger than 31 */
void checksmallopts()
{
int c;
c=getbyte();
switch (c) {
case 0:
if (TType && !EndSub) {
printf("<IS>");
TType=0;
}
else
printf("<Transmit Binary: 856>");
break;
case 1:
if (TType && !EndSub) {
printf("<SEND>");
TType=0;
}
else
printf("<Echo: 857>");
break;
case 2:
printf("<Reconnection>");
break;
case 3:
printf("<Suppress Go Ahead: 858>");
break;
case 4:
printf("<Approx Msg Size Negotiation>");
break;
case 5:
printf("<Request Status: 859>");
break;
case 6:
printf("<Request Timing Mark for synchronization: 860>");
break;
case 7:
printf("<Remote Controlled Trans and Echo: 726>");
break;
case 8:
printf("<Output Line Width>");
break;
case 9:
printf("<Output Page Size>");
break;
case 10:
printf("<Output CR Disposition: 652>");
break;
case 11:
printf("<Output HT Stops: 653>");
break;
case 12:
printf("<Output HT Disposition: 654>");
break;
case 13:
printf("<Output FF Disposition: 655>");
break;
case 14:
printf("<Output VT Stops: 656>");
break;
case 15:
printf("<Output VT Disposition: 657>");
break;
case 16:
printf("<Output LF Disposition: 658>");
break;
case 17:
printf("<Extended ASCII: 698>");
break;
case 18:
printf("<Logout: 727>");
break;
case 19:
printf("<Byte Macro: 735>");
break;
case 20:
printf("<Data Entry Terminal: 1043>");
break;
case 21:
printf("<SUPDUP: 734>");
break;
case 22:
printf("<SUPDUP Output: 749>");
break;
case 23:
printf("<Send Location: 779>");
break;
case 24:
printf("<Terminal Type: 1091>");
TType=1;
break;
case 25:
printf("<Terminiate data sent with EOR: 885>");
break;
case 26:
printf("<TACACS User Identification: 927>");
break;
case 27:
printf("<Output Marking: 933>");
break;
case 28:
printf("<Terminal Location Number: 946>");
break;
case 29:
printf("<Telnet 3270 Regime: 1041>");
break;
case 30:
printf("<X.3 PAD: 1053>");
break;
case 31:
printf("<Negotiate Window Size: 1073>");
break;
case 32:
printf("<Terminal Speed: 1079>");
break;
case 33:
printf("<Remote Flow Control: 1080>");
break;
case 34:
printf("<Line Mode: 1184>");
break;
case 35:
printf("<X Display Location 1096>");
break;
case 36:
printf("<Environment Option>");
break;
case 37:
printf("<Authentication Option>");
break;
case 38:
printf("<Encryption Option>");
break;
case 239:
printf("<Terminiate data sent with EOR: 885>");
break;
case 240: /* SE */
printf("<End Subnegotiation 855>");
EndSub=1;
break;
case 241:
printf("<NOOP>");
break;
case 242:
printf("<DMARK data stream protion of SYNCH: 854>");
break;
case 243:
printf("<Break signal: 854>");
break;
case 244:
printf("<Interrupt Process: 854>");
break;
case 245:
printf("<Abort Output: 854>");
break;
case 246:
printf("<Are You There: 854>");
break;
case 247:
printf("<Erase Character: 854>");
break;
case 248:
printf("<Erase Line: 854>");
break;
case 249:
printf("<Go Ahead: 858>");
break;
default:
if (!EndSub && c != 255) /* print char if in subnegot and not an IAC */
putchar(c);
else if (EndSub && c != 255) /* print # if not in subnegot and not IAC */
fprintf(stdout,"<%d>",c);
}
if (EndSub) /* insert a newline unless in the midst of subnegotiation */
putchar('\n');
}
/* some basic I/O functions */
int getbyte()
{
u_char b;
if(hexread(&b,1))
return( (int)b );
else
return( EOF );
}
u_short getword()
{
unsigned short buf;
if( hexread(&buf,2) )
return( ntohs(buf) );
else
return( EOF );
}
u_long getlword()
{
unsigned int buf;
if( hexread(&buf,4) )
return( ntohl(buf) );
else
return( EOF );
}
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