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Implement this year's consensus on CHANNEL_FAILURE vs CHANNEL_CLOSE.

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We now expect that after the server has sent us CHANNEL_CLOSE, we
should not expect to see any replies to our outstanding channel
requests, and conversely after we have sent CHANNEL_CLOSE we avoid
sending any reply to channel requests from the server. This was the
consensus among implementors discussing the problem on ietf-ssh in
April 2014.

To cope with current OpenSSH's (and perhaps other servers we don't
know about yet) willingness to send request replies after
CHANNEL_CLOSE, I introduce a bug-compatibility flag which is detected
for every OpenSSH version up to and including the current 6.6 - but
not beyond, since https://bugzilla.mindrot.org/show_bug.cgi?id=1818
promises that 6.7 will also implement the new consensus behaviour.

[originally from svn r10200]
This commit is contained in:
Simon Tatham
2014-07-06 14:05:39 +00:00
parent 3d337b49ef
commit aaaf70a0fc
6 changed files with 78 additions and 5 deletions
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1
windows/winhelp.h
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@ -146,6 +146,7 @@
#define WINHELP_CTX_ssh_bugs_rekey2 "ssh.bugs.rekey2:config-ssh-bug-rekey"
#define WINHELP_CTX_ssh_bugs_maxpkt2 "ssh.bugs.maxpkt2:config-ssh-bug-maxpkt2"
#define WINHELP_CTX_ssh_bugs_winadj "ssh.bugs.winadj:config-ssh-bug-winadj"
#define WINHELP_CTX_ssh_bugs_chanreq "ssh.bugs.winadj:config-ssh-bug-chanreq"
#define WINHELP_CTX_serial_line "serial.line:config-serial-line"
#define WINHELP_CTX_serial_speed "serial.speed:config-serial-speed"
#define WINHELP_CTX_serial_databits "serial.databits:config-serial-databits"