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This adds a very basic (probably wrong) DHCPv6 client,
to handle the "managed"-flag in IPv6 router solicitations.
We add -U option to pass the DHCPv6 client id as well as
an -s flag to manually add a dns server (because ppp
is going to call ipconfig to handle all the configuration
and write-back to /net/ndb in the future).
Have the remove command also remove default routes and
/net/ndb entries. (needed by ppp).
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the previous change introduces a out of bounds access
as it does not change n.
it is also conceptually wrong because this routine is
supposed to just verify the structure. as later getopts()
is *NOT* going to deal with malfored TLV's.
this actually replaces the android magic garbage with
OBpad bytes, which getopts() later will handle correctly
and makes sure the garbage is fully contained within
the buffer boundaries.
thanks sigrid for testing.
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Unless ip/dhcpd is started with the -6 option,
we only receive v4 addresses. If we do see the
v6 options we should prefer them but should
also make sure we grab the v4 addresses as a fallback.
None of the v6 options should overwrite valid
overrides given at the command line.
Add our custom types to logging.
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cleanup the null address (::) when the command gets interrupted.
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- do not write /net/ndb for loopback medium unless -p is specified
- use defmask() instead of hardcoded /64 for v6 to get correct /128 mask for ::1
- only do duplicate address detection on ethernet
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prints, cleanup
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multiple addresses in ndbconfig()
we now update /net/ndb with the following information gathered
from router advertisements (rfc6106 and plan9 specific options):
- recursive dns servers (option 25, ndb: dns=)
- dns search list (option 31, ndb: dnsdomain=)
- plan9 fileserver (option 250, ndb: fs=)
- plan9 authserver (option 251, ndb: auth=)
note the plan9 specific options can be disabled with the -G flag.
for ndbconfig (-N flag), we now collect all ip addresses in ndb
belonging to the devices mac address and configue them all. v6
addresses are getting added when a link local address exists
or the -6 flag has been specified to automatically configure one.
move the dhcp code in its own dhcp.c file and make symbols static
that are not used across modules.
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