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Add user-space ping example #336

Merged
merged 3 commits into from
Nov 5, 2017
Merged

Add user-space ping example #336

merged 3 commits into from
Nov 5, 2017

Commits on Aug 8, 2017

  1. Add a simple ICMPv4 ping example 

    This uses the socket stack to implement a subset of the standard
`ping` command.

Signed-off-by: David Scott <dave@recoil.org>
    @djs55
    djs55 committed Aug 8, 2017
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  2. icmpv4_socket: listen should block forever 

    Previously the listen function would exit after receiving one packet;
while the stack-direct loop would run until a low-level network error.

This patch makes the icmpv4_socket listen function block forever
and process packets in background threads with `Lwt.async`.

Signed-off-by: David Scott <dave@recoil.org>
    @djs55
    djs55 committed Aug 8, 2017
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  3. icmpv4_socket: correct the IPv4 total_length field 

    On some OSes (particularly macOS) the IP header returned to userspace
has a bogus total length (e.g. 16384). This probably reflects an internal
kernel buffer size rather than the on-the-wire size of the original
packet.

This patch corrects the IPv4 header total length so that the IPv4 parser
can parse the result. Previously it would return an Error.

Signed-off-by: David Scott <dave@recoil.org>
    @djs55
    djs55 committed Aug 8, 2017
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