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October 25, 2024 19:19
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Rust SOCK_RAW Linux raw sockets UDP example
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| use std::os::fd::AsRawFd; | |
| use nix::sys::socket; | |
| fn main() -> Result<(), std::io::Error> { | |
| let sock = socket::socket( | |
| socket::AddressFamily::Inet, | |
| socket::SockType::Raw, | |
| socket::SockFlag::empty(), | |
| socket::SockProtocol::Udp, | |
| )?; | |
| unsafe { | |
| let opt: libc::c_int = 1; | |
| let val = libc::setsockopt( | |
| sock.as_raw_fd(), | |
| libc::IPPROTO_IP, | |
| libc::IP_HDRINCL, | |
| &opt as *const _ as *const libc::c_void, | |
| std::mem::size_of::<libc::c_int>() as u32, | |
| ); | |
| if val < 0 { | |
| return Err(std::io::Error::last_os_error()); | |
| } | |
| } | |
| let payload = b"Hello, world!"; | |
| let dst_addr = socket::SockaddrIn::new(8, 9, 6, 4, 999); | |
| let src_addr = socket::SockaddrIn::new(127, 0, 0, 1, 1234); | |
| let pk = { | |
| let builder = | |
| etherparse::PacketBuilder::ipv4(src_addr.ip().octets(), dst_addr.ip().octets(), 255) | |
| .udp(src_addr.port(), dst_addr.port()); | |
| let mut vec = Vec::with_capacity(builder.size(payload.len())); | |
| if let Err(err) = builder.write(&mut vec, payload) { | |
| return Err(std::io::Error::new(std::io::ErrorKind::Other, err)); | |
| } | |
| vec | |
| }; | |
| socket::sendto(sock.as_raw_fd(), &pk, &dst_addr, socket::MsgFlags::empty())?; | |
| Ok(()) | |
| } |
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