126 lines
3.9 KiB
Markdown
126 lines
3.9 KiB
Markdown
[](https://travis-ci.org/rockdaboot/libpsl)
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[](https://scan.coverity.com/projects/rockdaboot-libpsl)
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[](https://coveralls.io/github/rockdaboot/libpsl?branch=master)
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libpsl - C library to handle the Public Suffix List
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===================================================
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A "public suffix" is a domain name under which Internet users can directly register own names.
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Browsers and other web clients can use it to
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- avoid privacy-leaking "supercookies"
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- avoid privacy-leaking "super domain" certificates ([see post from Jeffry Walton](https://lists.gnu.org/archive/html/bug-wget/2014-03/msg00093.html))
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- domain highlighting parts of the domain in a user interface
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- sorting domain lists by site
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Libpsl...
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- has built-in PSL data for fast access (DAWG/DAFSA reduces size from 180kB to ~32kB)
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- allows to load PSL data from files
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- checks if a given domain is a "public suffix"
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- provides immediate cookie domain verification
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- finds the longest public part of a given domain
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- finds the shortest private part of a given domain
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- works with international domains (UTF-8 and IDNA2008 Punycode)
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- is thread-safe
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- handles IDNA2008 UTS#46 (libicu is used by psl2c if installed)
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Find more information about the Publix Suffix List [here](https://publicsuffix.org/).
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Download the Public Suffix List [here](https://hg.mozilla.org/mozilla-central/raw-file/tip/netwerk/dns/effective_tld_names.dat).
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The DAFSA code has been taken from [Chromium Project](https://code.google.com/p/chromium/).
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API Documentation
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-----------------
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You find the current API documentation [here](https://rockdaboot.github.io/libpsl).
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Quick API example
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-----------------
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#include <stdio.h>
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#include <libpsl.h>
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int main(int argc, char **argv)
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{
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const char *domain = "www.example.com";
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const char *cookie_domain = ".com";
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const psl_ctx_t *psl = psl_builtin();
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int is_public, is_acceptable;
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is_public = psl_is_public_suffix(psl, domain);
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printf("%s %s a public suffix.\n", domain, is_public ? "is" : "is not");
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is_acceptable = psl_is_cookie_domain_acceptable(psl, domain, cookie_domain);
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printf("cookie domain '%s' %s acceptable for domain '%s'.\n",
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cookie_domain, is_acceptable ? "is" : "is not", domain);
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return 0;
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}
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Command Line Tool
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-----------------
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Libpsl comes with a tool 'psl' that gives you access to most of the
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library API via command line.
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$ psl --help
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prints the usage.
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Convert PSL into DAFSA
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----------------------
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The [DAFSA](https://en.wikipedia.org/wiki/Deterministic_acyclic_finite_state_automaton) format is a compressed
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representation of strings. Here we use it to reduce the whole PSL to about 32k in size.
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Generate `psl.dafsa` from `list/public_suffix_list.dat`
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$ src/psl-make-dafsa --output-format=binary --input-format=psl list/public_suffix_list.dat psl.dafsa
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Test the result (example)
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$ tools/psl --load-psl-file psl.dafsa aeroclub.aero
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License
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-------
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Libpsl is made available under the terms of the MIT license.<br>
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See the LICENSE file that accompanies this distribution for the full text of the license.
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src/psl-make-dafsa and src/lookup_string_in_fixed_set.c are licensed under the term written in
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src/LICENSE.chromium.
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Building from git
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-----------------
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You should have python2.7+ installed.
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Download project and prepare sources with
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git clone https://github.com/rockdaboot/libpsl
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./autogen.sh
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./configure
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make
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make check
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Mailing List
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------------
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[Mailing List Archive](http://news.gmane.org/gmane.network.dns.libpsl.bugs)
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[Mailing List](https://groups.google.com/forum/#!forum/libpsl-bugs)
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To join the mailing list send an email to
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<libpsl-bugs+subscribe@googlegroups.com>
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and follow the instructions provided by the answer mail.
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Or click [join](https://groups.google.com/forum/#!forum/libpsl-bugs/join).
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