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dbclient(1) General Commands Manual dbclient(1)
NAME
dbclient - lightweight SSH2 client
SYNOPSIS
dbclient [-Tt] [-p port] [-i id] [-L l:h:r] [-R l:h:r] [-l user] host [command]
dbclient [ args ] [user1]@host1[/port1],[user2]@host2[/port2],...
DESCRIPTION
dbclient is a SSH 2 client designed to be small enough to be used in small memory environments, while still being functional and secure
enough for general use.
If compiled with zlib support and if the server supports it, dbclient will always use compression.
OPTIONS
-p port
Remote port. Connect to port port on the remote host. Default is 22.
-i idfile
Identity file. Read the identity from file idfile (multiple allowed).
-L [listenaddress]:listenport:host:port
Local port forwarding. Forward the port listenport on the local host through the SSH connection to port port on the host host.
-R [listenaddress]:listenport:host:port
Remote port forwarding. Forward the port listenport on the remote host through the SSH connection to port port on the host host.
-l user
Username. Login as user on the remote host.
-t Allocate a pty.
-T Don't allocate a pty.
-N Don't request a remote shell or run any commands. Any command arguments are ignored.
-f Fork into the background after authentication. A command argument (or -N) is required. This is useful when using password authenti-
cation.
-g Allow non-local hosts to connect to forwarded ports. Applies to -L and -R forwarded ports, though remote connections to -R forwarded
ports may be limited by the ssh server.
-y Always accept hostkeys if they are unknown. If a hostkey mismatch occurs the connection will abort as normal.
-A Forward agent connections to the remote host. dbclient will use any OpenSSH-style agent program if available ($SSH_AUTH_SOCK will be
set) for public key authentication. Forwarding is only enabled if -A is specified.
-W windowsize
Specify the per-channel receive window buffer size. Increasing this may improve network performance at the expense of memory use.
Use -h to see the default buffer size.
-K timeout_seconds
Ensure that traffic is transmitted at a certain interval in seconds. This is useful for working around firewalls or routers that
drop connections after a certain period of inactivity. The trade-off is that a session may be closed if there is a temporary lapse
of network connectivity. A setting if 0 disables keepalives.
-I idle_timeout
Disconnect the session if no traffic is transmitted or received for idle_timeout seconds.
-J proxy_command
Use the standard input/output of the program proxy_command rather than using a normal TCP connection. A hostname should be still be
provided, as this is used for comparing saved hostkeys.
-B endhost:endport
"Netcat-alike" mode, where Dropbear will connect to the given host, then create a forwarded connection to endhost. This will then be
presented as dbclient's standard input/output.
Dropbear will also allow multiple "hops" to be specified, separated by commas. In this case a connection will be made to the first
host, then a TCP forwarded connection will be made through that to the second host, and so on. Hosts other than the final destina-
tion will not see anything other than the encrypted SSH stream. A port for a host can be specified with a slash (eg
matt@martello/44 ). This syntax can also be used with scp or rsync (specifying dbclient as the ssh/rsh command). A file can be
"bounced" through multiple SSH hops, eg
scp -S dbclient matt@martello,root@wrt,canyons:/tmp/dump .
Note that hostnames are resolved by the prior hop (so "canyons" would be resolved by the host "wrt") in the example above, the same
way as other -L TCP forwarded hosts are. Host keys are checked locally based on the given hostname.
ENVIRONMENT
DROPBEAR_PASSWORD
A password to use for remote authentication can be specified in the environment variable DROPBEAR_PASSWORD. Care should be taken
that the password is not exposed to other users on a multi-user system, or stored in accessible files.
SSH_ASKPASS
dbclient can use an external program to request a password from a user. SSH_ASKPASS should be set to the path of a program that
will return a password on standard output. This program will only be used if either DISPLAY is set and standard input is not a TTY,
or the environment variable SSH_ASKPASS_ALWAYS is set.
AUTHOR
Matt Johnston (matt@ucc.asn.au).
Mihnea Stoenescu wrote initial Dropbear client support
Gerrit Pape (pape@smarden.org) wrote this manual page.
SEE ALSO
dropbear(8), dropbearkey(8)
http://matt.ucc.asn.au/dropbear/dropbear.html
dbclient(1)