Date: Fri, 17 Dec 1999 08:32:27 +1030 From: Mark Newton <newton@internode.com.au> To: John and Jennifer Reynolds <jjreynold@home.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: anybody using tn-gw-nav to tunnel ssh through a proxy? Message-ID: <19991217083227.A3471@internode.com.au> In-Reply-To: <14425.10973.878258.39420@whale.home-net> References: <14425.10973.878258.39420@whale.home-net>
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On Thu, Dec 16, 1999 at 11:09:33AM -0700, John and Jennifer Reynolds wrote:
> but upon trying to ssh from work to my box I get this error message:
> Local: Corrupted check bytes on input.
tn-gw isn't 8-bit-clean; you'll need to patch it. Try something like
this: it creates a new tn-gw-> prompt command called "rawopen" which
gives you an 8-bit-clean link to whatever host/port you specify.
... and check with your IT security folks before running nos-tun
over it, won't you? :-)
- mark
*** tn-gw.c.orig Fri Jul 4 10:05:22 1997
--- tn-gw.c Mon Jul 7 10:48:15 1997
***************
*** 61,66 ****
--- 61,67 ----
static unsigned char prebuf[BUFSIZ];
static int prebufc;
static int kludgeraw = 0;
+ static int gimme8bit = 0;
static time_t ontime;
static time_t offtime;
***************
*** 78,83 ****
--- 79,85 ----
static int cmd_connect();
static int cmd_passwd();
static int cmd_xforward();
+ static int cmd_rawconn();
typedef struct {
char *name;
***************
*** 88,93 ****
--- 90,96 ----
"connect", " connect hostname [serv/port]", cmd_connect,
"telnet", " telnet hostname [serv/port]", cmd_connect,
"open", 0, cmd_connect,
+ "rawopen", " rawopen hostname [serv/port]", cmd_rawconn,
"x-gw", " x-gw [hostname/display]", cmd_xforward,
"help", " help/?", cmd_help,
"quit", " quit/exit", cmd_quit,
***************
*** 316,322 ****
if(!kludgeraw && FD_ISSET(0,&rdy)) {
if(rfd == -1) {
! say(0,"Remote server has closed connection");
goto leave;
}
x = read(0,xuf,sizeof(xuf));
--- 319,325 ----
if(!kludgeraw && FD_ISSET(0,&rdy)) {
if(rfd == -1) {
! if (!gimme8bit) say(0,"Remote server has closed connection");
goto leave;
}
x = read(0,xuf,sizeof(xuf));
***************
*** 342,348 ****
}
if(write(rfd,clientnull,x) != x) {
! say(0,"Remote server has closed connection");
goto leave;
}
outbytcnt += x;
--- 345,351 ----
}
if(write(rfd,clientnull,x) != x) {
! if (!gimme8bit) say(0,"Remote server has closed connection");
goto leave;
}
outbytcnt += x;
***************
*** 356,362 ****
if(rfd != -1 && FD_ISSET(rfd,&rdy)) {
x = read(rfd,xuf,sizeof(xuf));
if(x <= 0) {
! say(0,"Remote server has closed connection");
goto leave;
}
if(write(0,xuf,x) != x)
--- 359,365 ----
if(rfd != -1 && FD_ISSET(rfd,&rdy)) {
x = read(rfd,xuf,sizeof(xuf));
if(x <= 0) {
! if (!gimme8bit) say(0,"Remote server has closed connection");
goto leave;
}
if(write(0,xuf,x) != x)
***************
*** 738,744 ****
} else
syslog(LLEV,"permit host=%s/%s destination=%s",rladdr,riaddr,av[1]);
! if(port != TNPORT) {
unsigned char xuf[9];
xuf[0] = IAC;
--- 741,753 ----
} else
syslog(LLEV,"permit host=%s/%s destination=%s",rladdr,riaddr,av[1]);
! /* 19970704 newton@atdot.dotat.org
! * "gimme8bit" flag used to determine whether this actually happens.
! * Normally, if the proxy isn't connecting to port 23 it will
! * intercept telnet IAC sequences, meaning that we can't get an
! * 8-bit clean connection. If gimme8bit is true, this behaviour
! * will be suppressed. */
! if((port != TNPORT) && (!gimme8bit)) {
unsigned char xuf[9];
xuf[0] = IAC;
***************
*** 753,758 ****
--- 762,769 ----
if(write(0,xuf,9) != 9)
return(1);
kludgeraw = 1;
+ } else if (gimme8bit) {
+ syslog(LLEV, "RAW connection requested");
}
if((rfd = conn_server(av[1],port,0,buf)) < 0) {
***************
*** 768,774 ****
return(2);
}
!
baddest(fd,dest)
int fd;
--- 779,793 ----
return(2);
}
! static int
! cmd_rawconn(ac, av, cbuf)
! int ac;
! char *av[];
! char *cbuf;
! {
! gimme8bit = 1;
! return(cmd_connect(ac, av, cbuf));
! }
baddest(fd,dest)
int fd;
--
Mark Newton Email: newton@internode.com.au (W)
Network Engineer Email: newton@atdot.dotat.org (H)
Internode Systems Pty Ltd Desk: +61-8-82232999
"Network Man" - Anagram of "Mark Newton" Mobile: +61-416-202-223
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