[scamper-announce] scamper-cvs-20251020

[Matthew Luckie]

https://www.caida.org/catalog/software/scamper/code/scamper-cvs-20251020.tar.gz

SHA256 (scamper-cvs-20251020.tar.gz) = 6ef4d8d22c8cb3a4cc0391955d1a6c5f2c8e16f510c434f5cb9e9395676fcccd
SIZE (scamper-cvs-20251020.tar.gz) = 3291401

scamper:
* rework most internal use of printerror/scamper_debug, tagging
  measurement results with errmsg strings if an error occurs affecting
  a measurement.
* emit errmsg strings in json and warts output.  errmsg strings will
  also be emitted to debugfile / stderr as before.  these strings
  are not emitted in text output of measurements.
* add error result code (stop reason) to dealias measurements.
* silently ignore unlikely PTR lookup error conditions for trace and
  tracelb -- PTR lookups are not essential components of these
  measurements.
* fix memory leaks when encountering unlikely error conditions in
  sting, tbit, tracelb, udpprobe.

libscamperfile:
* add scamper_*_errmsg_get functions.
* let neighbourdisc src_mac and dst_ip be null when reading warts
  files, rather than reject the object.
* bump version.

Python library:
* release GIL when waiting for measurement results so that module is
  asyncio friendly.
* add errmsg attribute to measurement objects, interface file, and
  document.

sc_wartsdump:
* use scamper_*_[stop|result]_tostr functions rather than duplicate code.
* emit errmsg.

tests:
* check that errmsg is read-from and written-to warts files correctly.
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