IPv4 filter enhancement

[chros73]

A. Overview

Backport @sallyswiss's IPv4 filter enhancement that is:

• not a memory hog
  • current implementation uses 200 times more memory than it should
• supports p2p lists as well (along with cidr notaion: 10.0.0.0/8)
  • e.g. from bluetack
  • line format: foo bar:1.2.3.4-5.6.7.8
  • strores ranges as in p2p file format
  • supports comments in file
  • with LOG_PEER_INFO log level it logs when connection to unwanted peer is prevented
• still has quick log n lookup time for extents data structure
  • use ordered map instead of sparse hash

B. Usage

Download and extract one of the links into your session directory (first one is updated daily):

• antip2p.list.gz (glaszig's mkp2pblocklist)
• wael.list.p2p.gz (wael's blocklist)

Add this into your rtorrent config:

# Loads unwanted peers from external text file into IPv4 Filter every day, e.g.:
#   - https://silo.glasz.org/antip2p.list.gz (https://gist.github.com/glaszig/bf96beccf4694ae25d4f1f7cc6224985)
#   - https://www.wael.name/wael.list.p2p.gz (https://www.wael.name/other/best-blocklist/)
#schedule2 = load_ipv4_filter, 0, 24:00:00, "ipv4_filter.load=(cat,(session.path),antip2p.list),unwanted"
schedule2 = load_ipv4_filter, 0, 24:00:00, "ipv4_filter.load=(cat,(session.path),Wael-Blacklist-v8.dat),unwanted"

You can debug it with CTRL+X and one of the following:

print=(ipv4_filter.size_data)
print=(ipv4_filter.get,10.10.10.10)
print=(ipv4_filter.dump)

C. References

More info about IPv4 Filtering in rtorrent.

Relates to: rakshasa/rtorrent#109 , rakshasa/libtorrent#32, rakshasa/rtorrent#71, rakshasa/rtorrent#106