libnet v1.3

Note: MSYS2 and Cygwin builds for Windows do not work. Instead we
recommend msbuild (and npcap). If you are a Windows hacker and have
experience with MSYS2 and C, and want to help, please get in touch!

Changes

• License change of critical files from 4-clause BSD to 3-clause and
  2-clause BSD. This fixes issue #85: "GPL license compatibility".
• Migrate from Travis-CI (Linux) and Appveyor (Win32) to GitHub Actions
• Win32 changes:
  • switch to npcap from winpcap
  • Simplify and update build scripts
  • Encode version in DLL instead of in filename

Valery Ivanov:

• Add support for LLDP, mandatory TLVs.
• Add support for Cisco UniDirectional Link Detection (UDLD), RFC5171
• Initial support for unit tests:
  • libnet-build_ethernet()
  • Complete UDLD API tests
• Initial "devcontainer": provide VS Code development environment for
  rapid setup of a development environment
• Run unit tests in GitHub Actions
• New GitHub Action for FreeBSD 13 clang/gcc

Beniamin Sandu:

• Calling libnet_init() with a RAW type no longer sets a TX buffer max
  size. Use the new libnet_setfd_max_sndbuf() instead when needed.

Hervé Boisse:

• Remove support for SOCK_PACKET sockets causing invalid builds on,
  e.g., musl libc. We assume everyone on Linux has PF_PACKET now.

Fixes

• Fix #139: fail-to-build-from-source on FreeBSD

Valery Ivanov:

• Fix #122: unused parameter warnings
• Fix #123: potential memory leak in libnet_cq_add()
• Fix #124: potential name conflict with C++ keyword new

Thomas Habets:

• Fix #96: pointer type warnings when dumping raw data with %p
• Fix #97: non-standard types:
  • int64_t instead of __int64_t for mingw cross build
  • uint32_t instead of u_int and uint16_t instead of u_short
• Fix #98: lots of signed vs unsigned comparisons
• Fix #102: possible buffer overflows in libnet_plist_chain_dump_string()

Bernhard M. Wiedemann:

• Reproducible build fixes for man-page generation, use LC_ALL=C and UTC
• Simplify fixmanpages

Adrian Reber:

• Fix #120: possible NULL pointer dereference in libnet_cq_add()
• Fix #120: memory leak in libnet_plist_chain_new()

Stephan Hartmann:

• Fix segmentation fault in libnet_ifaddrlist()

Andy Roulin:

• Fix #150: segfault when number of IPs > 512