v1.8.0

Added

• A destination unreachable on the ICMP probe is told apart from a timeout:
  who sent it, a router or this host, and what it said. Classic prints
  From 192.0.2.1: seq=3 Destination Host Unreachable and counts them as
  +N errors in its summary, as ping does. Compact and extended put
  192.0.2.1 reports host unreachable first in Events. JSON adds
  icmp_unreachable ({"from", "kind"}) to that probe's line (see
  JSON_CONTRACT.md). It is still a lost probe, and nothing changes when none
  comes. On Linux (IPv4 and IPv6), macOS (IPv4) and Windows. A time
  exceeded (-t) and other ICMP errors are reported as before: a timeout on
  Linux and macOS, an error with the status on Windows.
• --icmp: the ICMP probe, what sping runs without an option until 2.0.
  It changes nothing today; scripts that rely on it keep it when 2.0 changes
  the default. It cannot be combined with --tcp; with --diagnose, the
  diagnosis keeps its extra probes, TCP included.
• sping --ip: this host's addresses, every interface, IPv4 and IPv6,
  each with its prefix, its kind (loopback, link-local, private,
  shared (CGNAT), global) and, for IPv6, its state (temporary,
  deprecated, tentative, duplicate). It also shows the source each
  family uses towards a reference address and the IPv4 default gateway.
  --view json prints one object (JSON_CONTRACT.md). It sends nothing and
  needs no privilege. --list-interfaces prints what it always printed.
• sping --ip --external [SERVER[:PORT]]: also the address and port a STUN
  server (RFC 8489, over UDP) sees each family's request come from, and the
  local socket it left from: an External line, and an external object
  in JSON. It asks a third party, so only when given; by default,
  stun.cloudflare.com:3478. At most three requests per family within 3 s.
  What the server does not say is unknown, and the exit code stays 0.

Upcoming in 2.0

• sping target will find out on its own why a target does not answer, as
  --diagnose does today. --icmp keeps the classic probe; -4, -6 and
  --tcp stay as they are.

Changed

• --diagnose: a long outage is diagnosed again. While the target stays
  down, sping runs the same checks 5 minutes after each diagnosis
  concludes, and the new conclusions replace the old ones once they are in.
  The classic view prints them each time; in JSON, state stays "done"
  meanwhile.
• --diagnose on Windows: when the other family's address is reported
  unreachable, the diagnosis now says that family fails too, as on Linux.
  It used to leave the other family untested, with
  ICMP error status 1100x.

Fixes

• --diagnose on Linux: a redirect arriving during a traceroute round
  could end that round with recv failed.

Packaging

• Builds with crossterm 0.29 and clap_mangen 0.3, the versions Debian sid
  ships. The output, the man page and the shell completions are unchanged.