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Old 12th June 2016
e1-531g e1-531g is offline
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Default Mark Tor circuits as dirty

Sometimes Tor exit node is on some blocklists etc.
Web page can become non accessible using this exit node.
If somebody wants to make new connections using new exit node, then he/she could tell Tor client to mark existing circuits as dirty and this should result in new exit nodes for new connections. This can by achieved in OpenBSD's command line using sudo, netcat, Unix domain socket:

Code:
$ sudo -u user_of_tor_client /bin/sh -c "/usr/bin/nc -U /path/control.socket < /path/commands_to_send.txt"
assuming that:
Code:
$ cat /path/commands_to_send.txt
AUTHENTICATE "my_secret_password"
SIGNAL NEWNYM
QUIT
$ grep -e ControlSocket -e HashedControlPassword /etc/tor/torrc
ControlSocket /path/control.socket
HashedControlPassword 16:1CA21AAA4E359DC26020875994A29E1D634785C38EE663B1984833C086
# grep 'nc -U' /etc/sudoers 
open    r2d2=(user_of_tor_client) NOPASSWD: /bin/sh -c /usr/bin/nc -U /path/control.socket < /path/commands_to_send.txt
and that open is the user executing sudo command and r2d2 is hostname.

Hash of password can be generated using:
Code:
tor --hash-password "my_secret_password" 
16:1CA21AAA4E359DC26020875994A29E1D634785C38EE663B1984833C086
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Old 28th June 2016
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hanzer hanzer is offline
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Default

Or, from a shell:
Code:
printf "AUTHENTICATE \"password\"\r\nSIGNAL NEWNYM\r\n" | nc -w 1 127.0.0.1 9051
Assuming /etc/tor/torrc contains something like:
Code:
SOCKSPolicy accept 127.0.0.1/16
ControlPort 9051
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Old 29th June 2016
e1-531g e1-531g is offline
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Yes, but I think that Unix domain socket is more secure. I think that because you can restrict access to socket, like to any file, using traditional Unix file permissions.
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