openssh bugs - Oct 2016 - [Bug 2626] New: ssh 172.10 resolves to ssh 172.0.0.10

https://bugzilla.mindrot.org/show_bug.cgi?id=2626

            Bug ID: 2626
           Summary: ssh 172.10 resolves to ssh 172.0.0.10
           Product: Portable OpenSSH
           Version: 7.3p1
          Hardware: 68k
                OS: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Miscellaneous
          Assignee: unassigned-bugs at mindrot.org
          Reporter: rajkipa at yahoo.com

Hello Team,

I found something weird today, i tried to ssh into a box with the below
command, instead of throwing an error it filled the middle to octet
with zeros. 

Looks like ssh is greed and tries to left-pad everything with zero
until it gets 4 octets. See the below two examples

1.
hostname $/usr/local/bin/ssh -v 172.10
OpenSSH_7.3p1, OpenSSL 1.0.2j  26 Sep 2016
debug1: Reading configuration data /Users/name/.ssh/config
debug1: /Users/name/.ssh/config line 2: Applying options for *
debug1: Reading configuration data /usr/local/etc/ssh/ssh_config
debug1: Connecting to 172.10 [172.0.0.10] port 22.
^C
hostname $


2.
hostname $ssh -v 172
OpenSSH_6.9p1, LibreSSL 2.1.8
debug1: Reading configuration data /Users/name/.ssh/config
debug1: /Users/name/.ssh/config line 2: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to 172 [0.0.0.172] port 22.
debug1: connect to address 0.0.0.172 port 22: No route to host
ssh: connect to host 172 port 22: No route to host

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Darren Tucker <dtucker at zip.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dtucker at zip.com.au

--- Comment #1 from Darren Tucker <dtucker at zip.com.au> ---
This is a feature of gethostbyname and earlier gethostbyaddr
interfaces: class.hostnum and the 32bit integer equivalent are
deprecated but still valid representations of an IP address.

Compare:
$ telnet 172.10
Trying 172.0.0.10...

$ telnet 1.512
Trying 1.0.2.0...

$ perl -le 'print 2**31+1'
2147483649
$ telnet 2147483649
Trying 128.0.0.1...

If you really want something to complain about, try this:
$ telnet  172.010
Trying 172.0.0.8...

That all said, it's not something that OpenSSH has anything to do with.

Also: hardware=68k?  for real?

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--- Comment #2 from Darren Tucker <dtucker at zip.com.au> ---
(In reply to Darren Tucker from comment #1)
> This is a feature of gethostbyname and earlier gethostbyaddr
err, those are both the earlier ones.  The current one is getaddrinfo.

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Darren Tucker <dtucker at zip.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

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--- Comment #3 from Darren Tucker <dtucker at zip.com.au> ---
Looks like this behaviour originated in inet_aton() in 4.2BSD.
https://en.wikipedia.org/wiki/Dot-decimal_notation

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #4 from Damien Miller <djm at mindrot.org> ---
closing resolved bugs as of 8.6p1 release

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