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sshpeer: initial definition and implementation of new SSH protocol...

sshpeer: initial definition and implementation of new SSH protocol The existing SSH protocol has several design flaws. Future commits will elaborate on these flaws as new features are introduced to combat these flaws. For now, hopefully you can take me for my word that a ground up rewrite of the SSH protocol is needed. This commit lays the foundation for a new SSH protocol by defining a mechanism to upgrade the SSH transport channel away from the default (version 1) protocol to something modern (which we'll call "version 2" for now). This upgrade process is detailed in the internals documentation for the wire protocol. The gist of it is the client sends a request line preceding the "hello" command/line which basically says "I'm requesting an upgrade: here's what I support." If the server recognizes that line, it processes the upgrade request and the transport channel is switched to use the new version of the protocol. If not, it sends an empty response, which is how all Mercurial SSH servers from the beginning of time reacted to unknown commands. The upgrade request is effectively ignored and the client continues to use the existing version of the protocol as if nothing happened. The new version of the SSH protocol is completely identical to version 1 aside from the upgrade dance and the bytes that follow. The immediate bytes that follow the protocol switch are defined to be a length framed "capabilities: " line containing the remote's advertised capabilities. In reality, this looks very similar to what the "hello" response would look like. But it will evolve quickly. The methodology by which the protocol will evolve is important. I'm not going to introduce the new protocol all at once. That would likely lead to endless bike shedding and forward progress would stall. Instead, I intend to tricle out new features and diversions from the existing protocol in small, incremental changes. To support the gradual evolution of the protocol, the on-the-wire advertised protocol name contains an "exp" to denote "experimental" and a 4 digit field to capture the sub-version of the protocol. Whenever we make a BC change to the wire protocol, we can increment this version and lock out all older clients because it will appear as a completely different protocol version. This means we can incur as many breaking changes as we want. We don't have to commit to supporting any one feature or idea for a long period of time. We can even evolve the handshake mechanism, because that is defined as being an implementation detail of the negotiated protocol version! Hopefully this lowers the barrier to accepting changes to the protocol and for experimenting with "radical" ideas during its development. In core, sshpeer received most of the attention. We haven't even implemented the server bits for the new protocol in core yet. Instead, we add very primitive support to our test server, mainly just to exercise the added code paths in sshpeer. Differential Revision: https://phab.mercurial-scm.org/D2061 # no-check-commit because of required foo_bar naming

Augie Fackler - - Load All Authors

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        Matt Mackall
    
tests: replace exit 80 with #require

              r22046
            
      #require no-msys # MSYS will translate web paths as if they were file paths

        Mads Kiilerich
    
tests: introduce 'hghave msys' to skip tests that would fail because of msys

              r15567
            
        Matt Mackall
    
tests: unify test-oldcgi

              r12472
            
      This tests if CGI files from before d0db3462d568 still work.

        $ hg init test

        $ cat >hgweb.cgi <<HGWEB

        Augie Fackler
    
tests: use $PYTHON in #! so we always use the right Python

              r32938
            
        > #!$PYTHON

        Matt Mackall
    
tests: unify test-oldcgi

              r12472
            
        > #

        > # An example CGI script to use hgweb, edit as necessary

        > 

        > import cgitb, os, sys

        > cgitb.enable()

        > 

        > # sys.path.insert(0, "/path/to/python/lib") # if not a system-wide install

        > from mercurial import hgweb

        > 

        > h = hgweb.hgweb("test", "Empty test repository")

        > h.run()

        > HGWEB

        $ chmod 755 hgweb.cgi

        $ cat >hgweb.config <<HGWEBDIRCONF

        > [paths]

        > test = test

        > HGWEBDIRCONF

        $ cat >hgwebdir.cgi <<HGWEBDIR

        Augie Fackler
    
tests: use $PYTHON in #! so we always use the right Python

              r32938
            
        > #!$PYTHON

        Matt Mackall
    
tests: unify test-oldcgi

              r12472
            
        > #

        > # An example CGI script to export multiple hgweb repos, edit as necessary

        > 

        > import cgitb, sys

        > cgitb.enable()

        > 

        > # sys.path.insert(0, "/path/to/python/lib") # if not a system-wide install

        > from mercurial import hgweb

        > 

        > # The config file looks like this.  You can have paths to individual

        > # repos, collections of repos in a directory tree, or both.

        > #

        > # [paths]

        > # virtual/path = /real/path

        > # virtual/path = /real/path

        > #

        > # [collections]

        > # /prefix/to/strip/off = /root/of/tree/full/of/repos

        > #

        > # collections example: say directory tree /foo contains repos /foo/bar,

        > # /foo/quux/baz.  Give this config section:

        > #   [collections]

        > #   /foo = /foo

        > # Then repos will list as bar and quux/baz.

        > 

        > # Alternatively you can pass a list of ('virtual/path', '/real/path') tuples

        > # or use a dictionary with entries like 'virtual/path': '/real/path'

        > 

        > h = hgweb.hgwebdir("hgweb.config")

        > h.run()

        > HGWEBDIR

        $ chmod 755 hgwebdir.cgi

        StevenGBrown
    
tests: remove duplication of the CGI environment variables

              r13269
            
        $ . "$TESTDIR/cgienv"

        Augie Fackler
    
tests: replace yet more calls to `python` with $PYTHON...

              r33262
            
        $ $PYTHON hgweb.cgi > page1

        $ $PYTHON hgwebdir.cgi > page2

        Matt Mackall
    
tests: unify test-oldcgi

              r12472
            
        $ PATH_INFO="/test/"

        $ PATH_TRANSLATED="/var/something/test.cgi"

        $ REQUEST_URI="/test/test/"

        $ SCRIPT_URI="http://hg.omnifarious.org/test/test/"

        $ SCRIPT_URL="/test/test/"

        Augie Fackler
    
tests: replace yet more calls to `python` with $PYTHON...

              r33262
            
        $ $PYTHON hgwebdir.cgi > page3

        Matt Mackall
    
tests: unify test-oldcgi

              r12472
            
        $ grep -i error page1 page2 page3

        [1]

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Matt Mackall tests: replace exit 80 with #require	r22046	#require no-msys # MSYS will translate web paths as if they were file paths
Mads Kiilerich tests: introduce 'hghave msys' to skip tests that would fail because of msys	r15567
Matt Mackall tests: unify test-oldcgi	r12472	This tests if CGI files from before d0db3462d568 still work.

		$ hg init test
		$ cat >hgweb.cgi <<HGWEB
Augie Fackler tests: use $PYTHON in #! so we always use the right Python	r32938	> #!$PYTHON
Matt Mackall tests: unify test-oldcgi	r12472	> #
		> # An example CGI script to use hgweb, edit as necessary
		>
		> import cgitb, os, sys
		> cgitb.enable()
		>
		> # sys.path.insert(0, "/path/to/python/lib") # if not a system-wide install
		> from mercurial import hgweb
		>
		> h = hgweb.hgweb("test", "Empty test repository")
		> h.run()
		> HGWEB

		$ chmod 755 hgweb.cgi

		$ cat >hgweb.config <<HGWEBDIRCONF
		> [paths]
		> test = test
		> HGWEBDIRCONF

		$ cat >hgwebdir.cgi <<HGWEBDIR
Augie Fackler tests: use $PYTHON in #! so we always use the right Python	r32938	> #!$PYTHON
Matt Mackall tests: unify test-oldcgi	r12472	> #
		> # An example CGI script to export multiple hgweb repos, edit as necessary
		>
		> import cgitb, sys
		> cgitb.enable()
		>
		> # sys.path.insert(0, "/path/to/python/lib") # if not a system-wide install
		> from mercurial import hgweb
		>
		> # The config file looks like this. You can have paths to individual
		> # repos, collections of repos in a directory tree, or both.
		> #
		> # [paths]
		> # virtual/path = /real/path
		> # virtual/path = /real/path
		> #
		> # [collections]
		> # /prefix/to/strip/off = /root/of/tree/full/of/repos
		> #
		> # collections example: say directory tree /foo contains repos /foo/bar,
		> # /foo/quux/baz. Give this config section:
		> # [collections]
		> # /foo = /foo
		> # Then repos will list as bar and quux/baz.
		>
		> # Alternatively you can pass a list of ('virtual/path', '/real/path') tuples
		> # or use a dictionary with entries like 'virtual/path': '/real/path'
		>
		> h = hgweb.hgwebdir("hgweb.config")
		> h.run()
		> HGWEBDIR

		$ chmod 755 hgwebdir.cgi

StevenGBrown tests: remove duplication of the CGI environment variables	r13269	$ . "$TESTDIR/cgienv"
Augie Fackler tests: replace yet more calls to `python` with $PYTHON...	r33262	$ $PYTHON hgweb.cgi > page1
		$ $PYTHON hgwebdir.cgi > page2
Matt Mackall tests: unify test-oldcgi	r12472
		$ PATH_INFO="/test/"
		$ PATH_TRANSLATED="/var/something/test.cgi"
		$ REQUEST_URI="/test/test/"
		$ SCRIPT_URI="http://hg.omnifarious.org/test/test/"
		$ SCRIPT_URL="/test/test/"
Augie Fackler tests: replace yet more calls to `python` with $PYTHON...	r33262	$ $PYTHON hgwebdir.cgi > page3
Matt Mackall tests: unify test-oldcgi	r12472
		$ grep -i error page1 page2 page3
		[1]