A "public suffix" is a domain name under which Internet users can directly register own names.
Browsers and other web clients can use it to
- avoid privacy-leaking "supercookies"
- avoid privacy-leaking "super domain" certificates (see post from Jeffry Walton)
- domain highlighting parts of the domain in a user interface
- sorting domain lists by site
Libpsl...
- has built-in PSL data for fast access
- allows to load PSL data from files
- checks if a given domain is a "public suffix"
- provides immediate cookie domain verification
- finds the longest public part of a given domain
- finds the shortest private part of a given domain
- works with international domains (UTF-8 and IDNA2008 Punycode)
- is thread-safe
- handles IDNA2008 UTS#46 (libicu is used by psl2c if installed)
Find more information about the Publix Suffix List here.
Download the Public Suffix List here.
You find the current API documentation here.
#include <stdio.h>
#include <libpsl.h>
int main(int argc, char **argv)
{
const char *domain = "www.example.com";
const char *cookie_domain = ".com";
const psl_ctx_t *psl = psl_builtin();
int is_public, is_acceptable;
is_public = psl_is_public_suffix(psl, domain);
printf("%s %s a public suffix.\n", domain, is_public ? "is" : "is not");
is_acceptable = psl_is_cookie_domain_acceptable(psl, domain, cookie_domain);
printf("cookie domain '%s' %s acceptable for domain '%s'.\n",
cookie_domain, is_acceptable ? "is" : "is not", domain);
return 0;
}
Libpsl comes with a tool 'psl' that gives you access to most of the library API via command line.
$ psl --help
prints the usage.
Libpsl is made available under the terms of the MIT license.
See the LICENSE file that accompanies this distribution for the full text of the license.
Download project and prepare sources with
git clone http://github.com/rockdaboot/libpsl
./autogen.sh
./configure
make
make check
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