telnetd, rlogind, rexexec, ftpd, socksd, hproxy – Internet remote access daemons

ip/telnetd [–adnptN] [–u user]



ip/ftpd [–aAde] [–n namepace–file]

ip/socksd [ –x inside ] [ –o outside ]


These programs support remote access across the Internet. All expect the network connection to be standard input, output, and error. They are normally started from scripts in /rc/bin/service (see listen(8)).

Telnetd allows login from a remote client. There are three types of login:
normal     Normal users log in by encrypting and returning a challenge printed by telnetd. The user can use either the netkey program (see passwd(1)) or a SecureNet handheld authenticator to encrypt the challenge. /lib/namespace defines the namespace.
noworld    Users in group noworld in /adm/users authenticate with a password in the clear. /lib/namespace.noworld defines the namespace.
anonymousUser none requires no authentication. /lib/namespace defines the namespace.

Telnetd's options are:
a   allow anonymous login by none
print debugging to standard error
p   don't originate any telnet control codes
n   turn on local character echoing and imply the p option
t   trusted, that is, don't authenticate
u   use user as the local account name
N   permit connections by `noworld' users only.

Rlogind logs in using the BSD remote login protocol. Rlogind execs telnetd –nu after completing its initial handshake.

Rexexec executes a command locally for a remote client. It uses the standard Plan 9 authentication (see authsrv(6)).

Ftpd runs the Internet file transfer protocol. Users may transfer files in either direction between the local and remote machines. As for telnetd, there are three types of login:
normal     Normal users authenticate via the same challenge/response as for telnetd. /usr/username/lib/namespace.ftp or, if that file does not exist, /lib/namespace defines the namespace.
noworld    Users in group noworld in /adm/users login using a password in the clear. /lib/namespace.noworld defines the namespace.
anonymousUsers anonymous and none require no authentication. The argument to the –n option (default /lib/namespace.ftp) defines the namespace. Anonymous users may only store files in the subtree below /incoming.

Ftpd's options are:
a   allow anonymous access
A   allow only anonymous access
d   write debugging output to standard error
e   treat any user as anonymous
n   the namespace for anonymous users (default /lib/namespace.ftp)

To preserve intended protections in shared file trees, any directory containing a file .httplogin is locked by ftpd; see httpd(8).

Socksd is a SOCKS4 and SOCKS5 proxy server allowing non Plan9 machines to access the outside network. The net to use for outgoing calls can be specified with the –o outside and the internal network is specified with –x inside (for UDP relay). If not specified, inside and outside will default to /net.

Hproxy is a simple HTTP proxy server.



ftpfs(4), pop3(8)

Hproxy first appeared in 9front (July, 2012). Socksd first appeared in 9front (March, 2012).