RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 20:47:45 +00:00
Code Issues Activity Actions

DHCPClient: Dont set DHCPOption::ServerIdentifier on DHCPRequest

Browse source 
Some real DHCP servers dont set the siaddr field in the DHCPOffer to
their IPv4 (and instead leave it blank - 0.0.0.0), which results in
the server assuming the DHCPRequest is not directed at him when it
has the ServerIdentifier option attached that specifies 0.0.0.0 as
the targeted server. So instead we just omit the option and let the
DHCP servers decipher the target themselves based on the requested IP.
This commit is contained in:
Idan Horowitz 2021-04-04 23:17:07 +03:00 • committed by Andreas Kling
parent 47fa8d83bb
commit 6b360834f2
1 changed files with 0 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

1
Userland/Services/DHCPClient/DHCPv4Client.cpp
View file

@ -287,7 +287,6 @@ void DHCPv4Client::dhcp_request(DHCPv4Transaction& transaction, const DHCPv4Pack
// set packet options
builder.set_message_type(DHCPMessageType::DHCPRequest);
builder.add_option(DHCPOption::ServerIdentifier, sizeof(IPv4Address), &offer.siaddr());
builder.add_option(DHCPOption::RequestedIPAddress, sizeof(IPv4Address), &offer.yiaddr());
auto& dhcp_packet = builder.build();