Re: ssh-keyscan exits in mid-way

Hi all,

Debug trace is given below.

# ssh-keyscan -vvv host.server.com
debug2: fd 3 setting O_NONBLOCK
debug1: no match: mpSSH_0.1.0
debug1: host.server.com doesn't support ssh1

# ssh -vvv host.server.com
OpenSSH_4.3p2-hpn, OpenSSL 0.9.7i 14 Oct 2005
HP-UX Secure Shell-A.04.30.005, HP-UX Secure Shell version
debug1: Reading configuration data /opt/ssh/etc/ssh_config
debug3: RNG is ready, skipping seeding
debug2: ssh_connect: needpriv 0
debug1: Connecting to host.server.com [15.244.96.225] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/3
debug1: identity file /.ssh/identity type 0
debug3: Not a RSA1 key file /.ssh/id_rsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /.ssh/id_rsa type 1
debug3: Not a RSA1 key file /.ssh/id_dsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /.ssh/id_dsa type 2
debug1: Remote protocol version 2.0, remote software version mpSSH_0.1.0
debug1: no match: mpSSH_0.1.0
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_4.3p2-hpn
debug2: fd 4 setting O_NONBLOCK
debug3: RNG is ready, skipping seeding
debug1: SSH2_MSG_KEXINIT sent
Received disconnect from 15.244.96.225: 11: SSH Disabled


--
M.P

----- Original Message -----
From: "Damien Miller" <djm@mindrot.org>
To: "ponraj" <tryponraj@gmail.com>
Cc: <openssh-unix-dev@mindrot.org>
Sent: Wednesday, July 19, 2006 10:23 AM
Subject: Re: ssh-keyscan exits in mid-way


> On Wed, 19 Jul 2006, ponraj wrote:
>
>> I digged up this problem further and find my results below.
>>
>> ssh-keyscan ignores the hosts if they are not up or sshd is not
>> running when used with -f <file> option. But when it encounters any
>> error while retrieving the host key from the machine which is up and
>> have sshd running, it simply exits. This may happen due to transport
>> layer implementation in packet.c at packet_read_poll_seqnr() which
>> results in exiting.
>>
>> My guess is that as packet.c is utilised by all OpenSSH utilities
>> including ssh-keyscan, we can't make ssh-keyscan to continue with
>> remaining hosts as specified in -f <files> in case of an error. But I
>> also vote for atleast documenting this one.
>
> ssh-keyscan could probably do with a cleanup_exit() implementation
> that looks at nonfatal_fatal, like its fatal() implmenetation does.
> This would obviously need to be done carefully.
>
> By the way, when you report problems please include debug traces. Saying
> that "ssh-keyscan exits in mid-way" doesn't give enough information
> for anyone to help you. Posting a debug trace from "ssh-keyscan -vvv"
> would.
>
> -d
>
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