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Rootless Pings in Rust

9 days ago
https://bou.ke/blog/rust-ping/
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  • #Rust
  • #Networking
  • #ICMP
  • Sending a ping via ICMP socket normally requires root, but the ping command line tool works without it by using a UDP socket with a protocol flag.
  • A Rust example demonstrates creating a UDP socket with ICMP protocol using the socket2 crate.
  • Linux and macOS handle ping packets differently: Linux kernel overrides identifier and checksum fields, while macOS requires correct checksum.
  • The response handling also differs between macOS (includes IP header) and Linux (does not include IP header).
  • Example code provided for sending a ping packet, calculating checksum (needed for macOS), and interpreting the response.
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