openssh unix dev - Sep 2002 - [Bug 401] ipv4 mapped address (ipv4 in ipv6) and ipv6 support fix

http://bugzilla.mindrot.org/show_bug.cgi?id=401

yoshfuji at linux-ipv6.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|misc. ipv4-mapped address   |ipv4 mapped address (ipv4 in
                   |support fix                 |ipv6) and ipv6 support fix



------- Additional Comments From yoshfuji at linux-ipv6.org  2002-09-24 11:36
-------
To clarify:
 - one is ipv4 mapped issue
 - another is ipv6 sin6_scope_id issue.
 - with latter one, we do not able to accept ipv4 connection 
   via ipv6 socket using "ipv4-mapped address" feature
   on some platforms.




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------- Additional Comments From djm at mindrot.org  2002-09-25 14:33 -------
I am not sure I understand this patch completely - I can't see anything
relating
to scope-id. is the scope-id incompatibility because of different sized
sockaddr_in6 structure lengths?

How does the problem manifest in unpatched OpenSSH?



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------- Additional Comments From yoshfuji at linux-ipv6.org  2002-09-25 15:04
-------
>is the scope-id incompatibility because of different sized
>sockaddr_in6 structure lengths?
Yes, if you try to run sshd with ipv6 support with glibc-2.2 on linux-2.2,
sshd disconnects any connections.  This is because
 - kernel gives sshd sockaddr_in6 without sin6_scope_id (size is 24 bytes)
 - glibc-2.2 expects sockaddr_in6 is 28 bytes long and 
   getnameinfo() failed because length is different than one expected.

>How does the problem manifest in unpatched OpenSSH?
|# sshd -6 -d
|:
|debug1: Bind to port 22 on ::.
|Server listening on :: port 22.
|Generating 768 bit RSA key.
|RSA key generation complete.
|debug1: Server will not fork when running in debugging mode.

When I connect to this sshd, sshd disconnects immediately.

|% ssh -v 127.0.0.1 
:
|debug1: Connecting to 127.0.0.1 [127.0.0.1] port 22.
|debug1: Connection established.
:
|ssh_exchange_identification: Connection closed by remote host
|debug1: Calling cleanup 0x8064174(0x0)

sshd debug messages are:

|get_sock_port: getnameinfo NI_NUMERICSERV failed
|debug1: Calling cleanup 0x806be4c(0x0)



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------- Additional Comments From djm at mindrot.org  2002-09-25 15:21 -------
OK - I understand now. We generally try to "#ifdef (platform)" in
portable
OpenSSH. Would you patch work if it were changed to do something like:

if (addr.ss_family == AF_INET6)
        fromlen = MIN(fromlen, sizeof(struct sockaddr_in6));




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