[英]How do I send a UDP datagram with source address 0.0.0.0 in Rust?
I am writing a DHCP client in Rust. 我在Rust中编写DHCP客户端。
The client must send a DHCPDISCOVER message when there are no configured interfaces. 没有配置的接口时,客户端必须发送DHCPDISCOVER消息。 Tools like
dhclient
are able to do that by sending the message with source address 0.0.0.0
. dhclient
类的工具可以通过发送源地址为0.0.0.0
的消息来实现此目的。
Unfortunately, with high level Rust primitives I cannot tweak IP header. 不幸的是,对于高级Rust原语,我无法调整IP标头。
Should I completely move to a low level networking solution (libc, nix) or is there a better approach? 我应该完全转向低级网络解决方案(libc,nix)还是有更好的方法?
The binding code: 绑定代码:
let socket = UdpBuilder::new_v4()?;
let socket = socket.bind(addr)?;
let socket = UdpSocket::from_std(socket, &Handle::default())?;
socket.set_broadcast(true)?;
UdpBuilder
is from the net2
crate. UdpBuilder
从net2
箱。
UdpSocket
is from the tokio
crate. UdpSocket
从tokio
箱。
addr
= SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0,0,0,0)), 68)
addr
= SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0,0,0,0)), 68)
It is not possible with Rust's high level UDP abstractions. Rust的高级UDP抽象是不可能的。
Low level packet builders must be used instead. 必须改用低级数据包生成器。 For example, BPF on FreeBSD and Mac OS.
例如,FreeBSD和Mac OS上的BPF。
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