An update:
- JSON is working, sample attached in case there are comments / wishes.
- Median (where possible) and stddev are working.
- pflag adds 160K to executable, passing for now.
- Interval restriction on non-root users works. "No can do" in Windows so far
(uid always -1). Tried looking at well-known Windows admin SIDs but it's
unclear I can really get that to work right on different Windows
versions/configs so...punt for now and no restriction in Windows.
- Spent more time than I should have making different combinations of timestamp
(none, receive, send, both, midpoint) and clock (wall, monotonic, both) modes
working, but at least now packets can be reduced in size by sacrificing
timestamps or clock modes for simulating VoIP codecs that have smaller
payloads, which was one of my goals.
- Read the OWAMP RFC, mostly. Good lord. At least it gave me an idea that the
server can (later) return received packet count and/or a bitmap of recently
received packets for a flow so we can distinguish between upstream and
downstream packet loss, which is not possible right now.
- Last thing to do is the handshake (saved the best for last!) Did some more
thinking on this to make it more robust than my previous design. Maybe about a
week to complete, we'll see, as this mixes with life stuff too...
- Stats output now in columns for easier reading:
```
sysadmin@luke:~ $ ./irtt -i 10ms -d 30s -l 160 a.b.c.d
IRTT to a.b.c.d (a.b.c.d:2112)
Min Mean Median Max Stddev
--- ---- ------ --- ------
RTT 11.59ms 15.73ms 14.39ms 49.34ms 3.64ms
send delay 5.9ms 9.23ms 6.8ms 43.16ms 3.48ms
receive delay 5.42ms 6.5ms 7.59ms 17.88ms 937µs
IPDV (jitter) 1.25µs 2.52ms 4.15ms 29.16ms 2.75ms
send IPDV 36ns 2.41ms 595µs 28.84ms 2.69ms
receive IPDV 60ns 734µs 3.55ms 9.57ms 914µs
send call time 56.3µs 70.6µs 236µs 22.7µs
timer error 4ns 11.3µs 9.59ms 187µs
server proc. time 6.93µs 7.62µs 68.1µs 2.23µs
duration: 30.2s (wait 148ms)
packets received/sent: 2996/2996 (0.00% loss)
bytes received/sent: 479360/479360
receive/send rate: 127.9 Kbps / 127.9 Kbps
timer stats: 4/3000 (0.13%) missed, 0.11% error
```
[g711.json.gz](https://github.com/tohojo/flent/files/1331004/g711.json.gz)
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