##Rapid DNS resolver
Asynchronous pluggable DNS resolver with many features.
##Features list
- can work with libev and libevent asynchronous cores (and this could be extended in future)
- follows secure resolver principles:
- randomize source port for outgoing requests (based on periodic IO sockets updates)
- use secure random generator for DNS ID
- compare request and reply
- support pool of sockets per server
- supports multiple DNS servers (unlimited amount actually)
- can parse resolv.conf file
- supports edns0 by default
- can include multiple queries in a packet
- RDNS supports plugins and DNSCurve in particular to encrypt DNS traffic
- can automatically handle IDN queries (encoded in UTF8)
##TODO list
- DNSSec support
- Recursion support
- TCP fallback
- Documentation and tests
Here is a simple example of using RDNS library with libev backend.
#include <stdlib.h>
#include <stdio.h>
#include "rdns.h"
#include "rdns_curve.h"
#include "rdns_ev.h"
static int remain_tests = 0;
static void
rdns_regress_callback (struct rdns_reply *reply, void *arg)
{
printf ("got result for host: %s\n", (const char *)arg);
if (--remain_tests == 0) {
rdns_resolver_release (reply->resolver);
}
}
static void
rdns_test_a (struct rdns_resolver *resolver)
{
char *names[] = {
"google.com",
"github.com",
"freebsd.org",
"kernel.org",
"www.ник.рф",
NULL
};
char **cur;
for (cur = names; *cur != NULL; cur ++) {
rdns_make_request_full (resolver, rdns_regress_callback, *cur, 1.0, 2, 1, *cur, RDNS_REQUEST_A);
remain_tests ++;
}
}
int
main(int argc, char **argv)
{
struct rdns_resolver *resolver_ev;
struct ev_loop *loop;
loop = ev_default_loop (0);
resolver_ev = rdns_resolver_new ();
rdns_bind_libev (resolver_ev, loop);
rdns_resolver_add_server (resolver_ev, argv[1], strtoul (argv[2], NULL, 10), 0, 8);
rdns_resolver_init (resolver_ev);
rdns_test_a (resolver_ev);
ev_loop (loop, 0);
return 0;
}