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This option allows to receive answers DHCP with arbitrary client addresses
Signed-off-by: Dmitrii Okunev <xaionaro@fb.com>
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Signed-off-by: Dmitrii Okunev <xaionaro@fb.com>
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Signed-off-by: kevin <kworm@missouri-telecom.com>
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Signed-off-by: kevin <kworm@missouri-telecom.com>
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Signed-off-by: kevin <kworm@missouri-telecom.com>
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Fix syntax nits
Simplified function as suggested by @pmazzini
Signed-off-by: kevin <kworm@missouri-telecom.com>
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Signed-off-by: kevin <kworm@missouri-telecom.com>
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RFCs).
Signed-off-by: Mantic <mikey.whitaker@gmail.com>
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IPv6 addresses would not cause a crash, but would silently listen on the
wildcard address instead of the passed address, which is surprising at
best. Instead check for the address family and reject non-v4 addresses
Signed-off-by: Anatole Denis <natolumin@unverle.fr>
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Tests use a randPort() workaround for not using port 0, as port 0 is not
usable with raw sockets.
We don't actually use raw sockets, so port 0 is fine, this makes use of
it which ensures we avoid port collisions.
Signed-off-by: Anatole Denis <natolumin@unverle.fr>
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NewIPv4UDPConn doesn't support listening on a specific address, only on
the wildcard address. This extends it to allow listening on an address,
and at the same time homogenizes the function signature with the
NewIPv6UDPConn server6 equivalent. It modifies NewServer() to pass the
full address given to it instead of just the port as well
Note that listening on a non-wildcard interface is seldom useful as the
socket won't receive broadcasts, so it is useless in a direct-attached
server. It can be useful in a server only used behind relays
This breaks API compatibility for NewIPv4UDPConn, which as far as I know
nobody uses (yet)
Signed-off-by: Anatole Denis <natolumin@unverle.fr>
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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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Signed-off-by: Chris Koch <chrisko@google.com>
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This moves the implementations of the BindToInterface to the interfaces/
package, since they aren't ipv4-specific.
The BindToInterface function remains in dhcpv4 (simply wraps the one in
interfaces) to keep backwards-compatibility
Additionally, fold bindtodevice_darwin into bindtodevice_bsd: darwin is
mostly a BSD, and happens to support IP_RECVIF, so use that instead of
IP_BOUND_IF, which only affects sends, not receives according to the
code comments in bsd/netinet/ip_output.c as well as being v4-only
Signed-off-by: Anatole Denis <natolumin@unverle.fr>
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In DHCPv4, when the ParameterRequestList option is not present in a
request, it should be assumed that the client wants to receive all the
options that the server is able to send. This changes the
IsOptionRequested method of dhcpv4.DHCPv4 to return true for any request
in that situation.
The reasoning is based on this wording in
[RFC2131§3.5](https://tools.ietf.org/html/rfc2131#section-3.5):
> Not all clients require initialization of all parameters listed in
> Appendix A. Two techniques are used to reduce the number of
> parameters transmitted from the server to the client. [...] Second, in
> its initial DHCPDISCOVER or DHCPREQUEST message, a client may provide
> the server with a list of specific parameters the client is interested
> in.
Signed-off-by: Anatole Denis <natolumin@unverle.fr>
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RFC 1700 recommends a value of 64 for the default IP time to live (TTL)
parameter. This is only necessary for the V4 client because it uses
the net.PacketConn, while the IPv6 implementation uses a net.UDPConn instead.
From https://tools.ietf.org/html/rfc1700:
IP TIME TO LIVE PARAMETER
The current recommended default time to live (TTL) for the
Internet Protocol (IP) [45,105] is 64.
Signed-off-by: Ross Hanson <rosshanson@google.com>
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Added a bind to interface functionality.
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Clients without an IP set their source address to 0.0.0.0, so the peer
returned by ReadFrom may not actually be the address to send to.
Clients without an IP should have their response broadcast.
Signed-off-by: Chris Koch <chrisko@google.com>
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No need to convert these types.
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Simple, nit-picky typo fixes.
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Usually this is used for clients that don't know how to receive any
other packets. We can deal with both a unicast or broadcast response
packet, so let's let the server decide on its own.
Signed-off-by: Chris Koch <chrisko@google.com>
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Signed-off-by: Chris Koch <chrisko@google.com>
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Nobody gives a hoot about the hardware type.
Signed-off-by: Chris Koch <chrisko@google.com>
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Signed-off-by: Chris Koch <chrisko@google.com>
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When reading raw packets from the network, it can happen that the raw
ethernet packet read has undefined bytes after the end of the ip
packet (either from the network or in some cases from the local
stack).
Those bytes should not be passed to the dhcp-receiver otherwise the
option parser which is picky about final padding byte will silently
discard the dhcp-reply.
Rename ipLen, udpLen variables with more explicit names to avoid
confusion between header, payload, total length possibly considered
in this function.
Tested: ast2500 bmc reproducing the issue + existing go test for coverage.
Signed-off-by: Loic Prylli <lprylli@netflix.com>
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- dnsmasq has been seen to null-terminate the bootfile option,
similar treament can occur for tftp-servername (although
tftp-servername option usage is less common).
- for the gateway information to be present in final packet,
the Router option should be queried again in request as
in discover (which matches behavior of udhcpc/dhclient).
Tested: pxeboot with u-root on dnsmask/ipv4 client.
Signed-off-by: Loic Prylli <lprylli@netflix.com>
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Relays might drop packets coming from clients if they have the
Gateway IP set. This modifier is supposed to be used by relays:
`WithReply` is used only by clients.
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Now the CI will also run golangci-lint
Signed-off-by: Andrea Barberio <insomniac@slackware.it>
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Why did I ever think this would work??
Signed-off-by: Christopher Koch <chrisko@google.com>
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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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Signed-off-by: Christopher Koch <chrisko@google.com>
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Signed-off-by: Christopher Koch <chrisko@google.com>
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Fixes #246
Signed-off-by: Andrea Barberio <insomniac@slackware.it>
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After investigation on DHCP relaying with BDCOM P3608 GPON OLT switches, i found that 'End' option is not always padded with 0x00, but for some packets is padded by the same 0xFF (End) option.
DHCPv4 fails to parse such type of packets and throws an "Invalid options" error. But Wireshark says that all is just fine with 0xFF padding.
This commit allows to use 0xFF/0x00 End option padding instead of strict 0x00. This allows BDCOM switches relaying mechanism to work with package.
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Certain older DHCP servers and relay agents follow the RFC 951 BOOTP
standard in which BOOTP/DHCP messages have a 300 byte minimum length.
Signed-off-by: Christopher Koch <chrisko@google.com>
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- Able to send UDP packets before interface is configured.
- Able to use any net.PacketConn.
- RFC2131-compliant retransmission logic.
- Tests.
- Race-condition-averse.
Previous clients (both mine and the ones here) are prone to race
condition errors.
Having one and only one place that calls receive on the socket
"continuously" without having to coordinate hand-offs makes the logic
way easier to follow, and allows for multiple requests in flux at a
time.
Signed-off-by: Christopher Koch <chrisko@google.com>
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