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The concrete type under the interface is known here since we create the
connection in the same function. Since *net.UDPConn implements
net.PacketConn anyway, returning the concrete type here is more powerful
and less risky than having downstream users cast the value themselves
There should be no code change for downstream users, with the exception
of explicit casts (`udpc := conn.(*net.UDPConn)`), which can simply be
removed
Signed-off-by: Anatole Denis <natolumin@unverle.fr>
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Signed-off-by: Chris Koch <chrisko@google.com>
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Similar to server4 where the UDP connection is manually created using
the socket interfaces, this creates a connection with adequate options:
* SO_BINDTODEVICE or equivalent if an interface is requested
* V6ONLY when supported by the operating system
* Allows binding to a multicast address specifically instead of
falling back to wildcard
Signed-off-by: Anatole Denis <natolumin@unverle.fr>
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Joining a multicast group with an address that can't be received on a
socket is ineffective, at least on linux.
This updates the logic of NewServer in a mostly backwards-compatible
way, to enable listening on arbitrary multicast addresses:
* Unicast addresses see no user-visible change, but don't join a
multicast group for which they don't receive traffic anyway
* Multicast addresses start actually receiving traffic for the group
they represent, and don't join the default group. **this is a
behaviour change**: previously they would receive traffic for the
default group if it was on the same port and **not** for the group
they represent. I consider that previous behaviour a bug
* Wildcard addresses, if on the proper port, will join both
AllDHCPRelayAgentsAndServers and AllDHCPServers **this is a behaviour
change**: previously only AllDHCPRelayAgentsAndServers was joined
* Wildcard addresses on another port: no visible change, same as
unicast case
Signed-off-by: Anatole Denis <natolumin@unverle.fr>
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Mostly addressed missing error checking.
Signed-off-by: Andrea Barberio <insomniac@slackware.it>
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The previous logic was wrong - there's no "listening" on multicast
address, the server should listen on the given address, and join the
multicast group. This PR fixes it.
Also moved the multicast addresses to a common package.
Tested with unit/integ tests, and with coredhcp.
Signed-off-by: Andrea Barberio <insomniac@slackware.it>
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Server6 and Server4 had Serve methods that return without reporting an
error, changed in this PR.
Serve now also closes the connection when done.
Signed-off-by: Andrea Barberio <insomniac@slackware.it>
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- RapidCommit solicits wait for Reply messages, not Advertise.
- Default recipient should be all relay agents and servers, not just
servers.
- Make New() and NewWithConn() interface same as in nclient4.
Signed-off-by: Christopher Koch <chrisko@google.com>
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- Race-condition-averse.
- Supports multiple concurrent requests.
- Tested.
- Requires a fully compatible net.PacketConn.
Signed-off-by: Christopher Koch <chrisko@google.com>
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- Make members directly accessible.
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