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Implement connection sharing between instances of PuTTY.

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The basic strategy is described at the top of the new source file
sshshare.c. In very brief: an 'upstream' PuTTY opens a Unix-domain
socket or Windows named pipe, and listens for connections from other
PuTTYs wanting to run sessions on the same server. The protocol spoken
down that socket/pipe is essentially the bare ssh-connection protocol,
using a trivial binary packet protocol with no encryption, and the
upstream has to do some fiddly transformations that I've been
referring to as 'channel-number NAT' to avoid resource clashes between
the sessions it's managing.

This is quite different from OpenSSH's approach of using the Unix-
domain socket as a means of passing file descriptors around; the main
reason for that is that fd-passing is Unix-specific but this system
has to work on Windows too. However, there are additional advantages,
such as making it easy for each downstream PuTTY to run its own
independent set of port and X11 forwardings (though the method for
making the latter work is quite painful).

Sharing is off by default, but configuration is intended to be very
easy in the normal case - just tick one box in the SSH config panel
and everything else happens automatically.

[originally from svn r10083]
This commit is contained in:
Simon Tatham
2013-11-17 14:05:41 +00:00
parent f6f78f8355
commit bb78583ad2
30 changed files with 3915 additions and 216 deletions
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6
putty.h
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@ -844,6 +844,9 @@ void cleanup_exit(int);
* large window in SSH-2. \
*/ \
X(INT, NONE, ssh_simple) \
X(INT, NONE, ssh_connection_sharing) \
X(INT, NONE, ssh_connection_sharing_upstream) \
X(INT, NONE, ssh_connection_sharing_downstream) \
/* Options for pterm. Should split out into platform-dependent part. */ \
X(INT, NONE, stamp_utmp) \
X(INT, NONE, login_shell) \
@ -1016,7 +1019,8 @@ struct logblank_t {
void log_packet(void *logctx, int direction, int type,
char *texttype, const void *data, int len,
int n_blanks, const struct logblank_t *blanks,
const unsigned long *sequence);
const unsigned long *sequence,
unsigned downstream_id, const char *additional_log_text);
/*
* Exports from testback.c