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| critbit | CTRex | |
|---|---|---|
| 3 | - | |
| 330 | 22 | |
| - | - | |
| 0.0 | 0.0 | |
| over 2 years ago | over 6 years ago | |
| C | Haskell | |
| - | BSD 3-clause "New" or "Revised" License |
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critbit
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Ask HN: What are some 'cool' but obscure data structures you know about?
> Good use-case: routing. Say you have a list of 1 million IPs that are [deny listed].
Apparently, bloom filters make for lousy IP membership checks, read: https://blog.cloudflare.com/when-bloom-filters-dont-bloom/
CritBit Trie [0] and possibly Allotment Routing Table (ART) are better suited for IPs.
[0] https://github.com/agl/critbit
[1] https://web.archive.org/web/20210720162224/https://www.harig...
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Rethink-app: DNS over HTTPS, firewall, and connection tracker for Android
developer here
I'd imagine the app should work over IPv6-only networks thanks to 464xlat. I may be wrong, because I've never tested it on a IPv6-only network.
The reason for IPv6 is two fold:
1. Firewall today simply stores classless IP address rules as strings in a sqlite table fronted by a lfu cache backed by a typical hash-map. With IPv6, I'd imagine, this won't scale. So, we need a more economical in-memory data-structure (like a crit-bit trie [0] or art tree).
2. Apparently LwIP has problems with HappyEyeballs (I personally never saw it, but got a couple of reports from users about it that it was an unrecoverable error once the connectivity was lost, and the firewall had to be restarted). We're in the process of replacing LwIP with gvisor/netstack now [2], just to get IPv6 support back on track.
[0] https://github.com/agl/critbit
[1] http://www.hariguchi.org/art/art.pdf
[2] https://github.com/celzero/firestack/issues/3
- Critbit Trees in C(WEB)
CTRex
We haven't tracked posts mentioning CTRex yet.
Tracking mentions began in Dec 2020.
What are some alternatives?
flatbuffers - An implementation of the flatbuffers protocol in Haskell.
code-builder - Packages for defining APIs, running them, generating client code and documentation.
tables - Deprecated because of
bson - Haskell representation and serialization of BSON documents (version 1.0) as defined at bsonspec.org
rethink-app - DNS over HTTPS / DNS over Tor / DNSCrypt client, WireGuard proxifier, firewall, and connection tracker for Android.
audiovisual - Extensible records, variants, structs, effects, tangles
semantic-source - Parsing, analyzing, and comparing source code across many languages
primitive - This package provides various primitive memory-related operations.
nextstep-plist - Parser and printer for NextStep style plist files
certificate - Certificate and Key Reader/Writer in haskell
data-treify - Reify a recursive data structure into an explicit graph.
cereal