[scamper-announce] scamper-cvs-20250106

[Matthew Luckie]

https://www.caida.org/catalog/software/scamper/code/scamper-cvs-20250106.tar.gz

SHA256 (scamper-cvs-20250106.tar.gz) = d746f15d58b0eb6d95f263e8b4062958c1586082ef7e91d31eafb3ca4c38c080
SIZE (scamper-cvs-20250106.tar.gz) = 3009196

scamper:
* handle many ports in BPF compiler better.
* remove cycles, autoreload features from file input sources.
* do not compile in support for select(2) by default (saving CPU and
  memory in the default use).
* normalize kqueue(2) / epoll(2) code paths.
* use IP_RECVIF on platforms (FreeBSD) that don't have IP_PKTINFO.
* remove sig_tx_ip_src from task signature structure, nothing used it.
* add holdtime (-H) parameter back to scamper, will controls the
  length of time that scamper will hold task signatures before
  allowing a follow up measurement to use the same signature.  5
  seconds by default, disable with zero (to save memory and CPU).
* fix compilation when platform has IPV6_PKTINFO but not
  IPV6_RECVPKTINFO setsockopt (old platforms).
* replace calls to getaddrinfo AI_NUMERICHOST with calls to inet_pton
  (fixes complilation on old MacOS, and is probably the faster
  solution generally).
* increase pps-max (scamper -p) to 50,000.
* adjust timestamps using datalink timestamps when using
  trace -N <squeries>.
* reduce memory use in storing traceroute state.
* remove per-measurement pktbufs, to save a tiny amount of memory.
* refactor BPF compiler to make it more obvious what is going on.
* refactor ping task signatures to make it more obvious what is going
  on.
* refactor scamper's timeout calculation to make it more obvious what
  is going on.
* move output of done tasks into its own function to make it more
  obvious what is going on.

throughout:
* reduce memory use in dlist_t, splaytree_t, heap_t.
* rearrange header include order in mjl_heap.c, mjl_list.c,
  mjl_patricia.c, mjl_prefixtree.c, mjl_splaytree.c so that asserts
  are not compiled in by default (saving CPU).
* update string_concat code reduce use of vsnprintf, which will
  reduce CPU use in things like rendering json.
* remove hardly-used onremove callback support from [cds]list_t,
  splaytree_t, heap_t, saving memory / CPU.

libscamperfile, libscamperctrl:
* bump library version because underlying code changed (API did not)

tests:
* add string_concat test to unit_string.
* add unit_splaytree, unit_heap, unit_http_warts, unit_ping_warts,
  unit_trace_warts, unit_udpprobe_warts tests.  http, trace, and
  udpprobe warts unit tests were contributed by Marcus Luckie.
* add fuzz_warts for fuzzing libscamperfile, contributed by Marcus
  Luckie.
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