05-14-2002
What was the date on the tarball?
Here is a writeup on AnonCVS at the OpenBSD site:
http://www.openbsd.org/anoncvs.html
I have used the AnonCVS method to update my ports tree in the past.
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LEARN ABOUT NETBSD
rfc6056
RFC6056(7) BSD Miscellaneous Information Manual RFC6056(7)
NAME
rfc6056 -- port randomization algorithms
DESCRIPTION
The rfc6056 algorithms are used in order to randomize the port allocation of outgoing UDP packets, in order to provide protection from a
series of ``blind'' attacks based on the attacker's ability to guess the sequence of ephemeral ports associated with outgoing packets. For
more information consult RFC 6056.
The individual algorithms are described below:
The RFC 6056 algorithms
The following algorithms are available:
bsd This is the default NetBSD port selection algorithm, which starts from anonportmax and proceeds decreasingly through the avail-
able ephemeral ports.
random_start Select ports randomly from the available ephemeral ports. In case a collision with a local port is detected, the algorithm
proceeds decreasingly through the sequence of ephemeral ports until a free port is found. Note that the random port selection
algorithms are not guaranteed to find a free port.
random_pick Select ports randomly from the available ephemeral ports. In case a collision with a local port is detected the algorithm
tries selecting a new port randomly until a free port is found.
hash Select ports using a md5(3) hash of the local address, the foreign address, and the foreign port. Note that in the case of a
bind(2) call some of this information might be unavailable and the port selection is delayed until the time of a connect(2)
call, performed either explicitly or up calling sendto(2).
doublehash Select ports using a md5(3) hash of the local address, foreign address, and foreign port coupled with a md5(3) hash of the same
components obtained using a separate table that is associated with a subset of all outgoing connections. The same considera-
tions regarding late connection as in the case of hash apply.
randinc Use random increments in order to select the next port.
SYSCTL CONTROLS
The following sysctl controls are available for selecting the default port randomization algorithm:
sysctl name Type Changeable
net.inet.udp.rfc6056.available string no
net.inet.udp.rfc6056.selected string yes
net.inet6.udp6.rfc6056.available string no
net.inet6.udp6.rfc6056.selected string yes
SOCKET OPTIONS
The socket option UDP_RFC6056ALGO at the IPPROTO_UDP level can be used with a string argument specifying the algorithm's name in order to
select the port randomization algorithm for a specific socket. For more info see setsockopt(2).
SEE ALSO
setsockopt(2), sysctl(3), sysctl(7)
HISTORY
The rfc6056 algorithms first appeared in NetBSD 6.0.
BSD
August 25, 2011 BSD