How can I use Raw Sockets in Go to customize DHCP discoveries with forged IP source addresses?

Understanding Raw Socket Usage in Go

In order to receive and forward DHCP discoveries with customized IP source addresses, consider utilizing Raw Sockets in Go. Raw Sockets provide control over packet headers, allowing you to forge packets with specific source IP addresses.

Security Considerations

Note that forging IP source addresses can pose security risks. It's essential to run your application with root privileges or grant it the CAP_NET_RAW capability (via setcap) for proper functionality.

Raw Sockets in Go

Go's standard net library lacks raw socket support since it's specialized and may experience API changes. However, the go.net subrepository offers ipv4 and ipv6 packages, with the former suitable for your needs. Check out http://godoc.org/code.google.com/p/go.net/ipv4#NewRawConn for further details.

Header Modification

Utilize ipv4.RawConn's ReadFrom method to obtain source packets. You can then use these fields, along with your GIADDR logic, to set up headers for WriteTo calls. Here's an illustrative code snippet:

for {
  hdr, payload, _, err := conn.ReadFrom(buf)
  if err != nil { ... }
  hdr.ID = 0
  hdr.Checksum = 0
  hdr.Src = ...
  hdr.Dst = ...
  if err := conn.WriteTo(hdr, payload, nil); err != nil { ... }
}

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