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2019-09-12Increase DHCPv4 IP TTL from 30 to 64 (#314)Ross Hanson
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>
2019-08-14Bind interface fix (#310)borna-blazevic
Added a bind to interface functionality.
2019-07-29server4: set peer to broadcast if client IP is zeroChris Koch
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>
2019-07-22Fixed unnecessary conversions in dhcpv6 (#305)Christian Muehlhaeuser
No need to convert here.
2019-07-22Fixed unnecessary conversions (#304)Christian Muehlhaeuser
No need to convert these types.
2019-07-22Fixed typos in dhcpv4 (#303)Christian Muehlhaeuser
Simple, nit-picky typo fixes.
2019-07-12add contributors to ZTP packagePablo Mazzini
2019-07-05v4 discover: don't ask for broadcastChris Koch
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>
2019-07-05README: add link to godocChris K
Signed-off-by: Chris Koch <chrisko@google.com>
2019-06-27dhcpv4: actually use random number timeoutChris Koch
Signed-off-by: Chris Koch <chrisko@google.com>
2019-06-20Fix TravisCI build (#297)insomniac
2019-06-19dhcpv4: make the short stringer more usefulChris Koch
Nobody gives a hoot about the hardware type. Signed-off-by: Chris Koch <chrisko@google.com>
2019-06-19nclient4: add logging optionsChris Koch
Signed-off-by: Chris Koch <chrisko@google.com>
2019-05-24Changing Arista cid regex forprepended bytes (#293)Akshay Navale
2019-05-22Ignore bytes after end of IP packet in BroadcastRawUDPConn.ReadFrom (#292)lprylli
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>
2019-05-15Adding Juniper EX pattern for circuit parsing (#291)Akshay Navale
2019-05-14Remove SHIFT IN character bytes from Circuit ID (#289)Akshay Navale
2019-05-14Improve compatibility with some ipv4 networks.Loic Prylli
- 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>
2019-05-09NewReplyFromRequest: copy gw ipPablo Mazzini
2019-05-09NewReplyFromRequest: copy gw ipPablo Mazzini
2019-05-09Adding RemoteID option while creating a Relayed Encapsulated Packet (#282)Akshay Navale
2019-05-09[dhcpv4] Do not Gateway IP address on packets sent by clients (#287)Marco Guerri
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.
2019-05-08[CI] Added lintersAndrea Barberio
Now the CI will also run golangci-lint Signed-off-by: Andrea Barberio <insomniac@slackware.it>
2019-05-08Addressed more linter warningsAndrea Barberio
Mostly addressed missing error checking. Signed-off-by: Andrea Barberio <insomniac@slackware.it>
2019-05-08Addressed various linter warningsAndrea Barberio
Mostly for dead code and potentially wrong comparisons. Signed-off-by: Andrea Barberio <insomniac@slackware.it>
2019-05-02[dhcpv6] Handle SOLICIT with rapid commit in NewReplyFromMessageAndrea Barberio
NewReplyFromMessage creates a reply from a message. With this patch it can handle Solicit messages with rapid-commit. RFC3315 states that: ``` If the client has included a Rapid Commit option in its Solicit message, the client terminates the waiting process as soon as a Reply message with a Rapid Commit option is received. ``` Signed-off-by: Andrea Barberio <insomniac@slackware.it>
2019-04-30[netboot] Return error when there is oneAndrea Barberio
The current implementation has a bug, so that it always returns `nil`, even when an error happened. This PR fixes it. Signed-off-by: Andrea Barberio <insomniac@slackware.it>
2019-04-29[server6] Server should join multicast addressAndrea Barberio
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>
2019-04-29[netboot] use rtnl packageAndrea Barberio
After adding the higher-level [rtnl package](https://github.com/jsimonetti/rtnetlink/pull/44) let's switch to it. Pending https://github.com/jsimonetti/rtnetlink/pull/50 Signed-off-by: Andrea Barberio <insomniac@slackware.it>
2019-04-24[dhcpv6] Solicit messages derive default IAID from MAC addressAndrea Barberio
IAID must be set by the client. This patch generates the IAID from the MAC address of the interface. To do so, a new WithIAID modifier is added, the interface of NewSolicitWithCID now requires a hwaddr parameter, and NewAdvertiseFromSolicit copies the IA_NA option from the solicit if present. Signed-off-by: Andrea Barberio <insomniac@slackware.it>
2019-04-23Revert "[dhcpv6] Solicit messages derive default IAID from MAC address"Andrea Barberio
This reverts commit b071bdc86a58037f6c745647c97fca202f3caef9. Signed-off-by: Andrea Barberio <insomniac@slackware.it>
2019-04-23[dhcpv6] Solicit messages derive default IAID from MAC addressAndrea Barberio
IAID must be set by the client. This patch generates the IAID from the MAC address of the interface. To do so, a new WithIAID modifier is added, the interface of NewSolicitWithCID now requires a hwaddr parameter, and NewAdvertiseFromSolicit copies the IA_NA option from the solicit if present. Signed-off-by: Andrea Barberio <insomniac@slackware.it>
2019-04-17nclient4: fix conn race conditionChristopher Koch
Why did I ever think this would work?? Signed-off-by: Christopher Koch <chrisko@google.com>
2019-04-17[server] Serve returns an error, and closes when doneAndrea Barberio
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>
2019-04-15Replace vishvananda/netlink with jsimonetti/rtnetlink (#271)insomniac
Fixes #257 And saves ~100kb. Signed-off-by: Andrea Barberio <insomniac@slackware.it>
2019-04-09Update .travis.ymlinsomniac
2019-04-07nclient6: small fixesChristopher Koch
- 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>
2019-04-07nclient4: simplify New interfaceChristopher Koch
Signed-off-by: Christopher Koch <chrisko@google.com>
2019-04-04client6: new async DHCPv6 client like #250.Christopher Koch
- Race-condition-averse. - Supports multiple concurrent requests. - Tested. - Requires a fully compatible net.PacketConn. Signed-off-by: Christopher Koch <chrisko@google.com>
2019-04-04dhcpv4: add RFC3442 route optionsChristopher Koch
Signed-off-by: Christopher Koch <chrisko@google.com>
2019-04-03Use cancellable crypto RNG from u-rootAndrea Barberio
Fixes #246 Signed-off-by: Andrea Barberio <insomniac@slackware.it>
2019-04-03Allow 0xFF padding in 'End' option (#265)Alexander Tischenko
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.
2019-04-03Modifying the writeIP function to always write IPv4 in 4 byte long format.Akshay Navale
2019-03-29server4 test: pick ports > 32kChris K
2019-03-29dhcpv4: pad v4 messages to a 300 byte minimumChristopher Koch
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>
2019-03-29update README: add u-rootPablo Mazzini
2019-03-27client4: add a new DHCPv4 client.Christopher Koch
- 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>
2019-03-14client: simulate relay (#259)Pablo Mazzini
2019-03-13Add partial (client) binding support for BSD (#260)Dmitri Goutnik
2019-03-13Adding CircuitId parsing logic into dhcpv4 lib (#255)Akshay Navale
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