tres.cc File Reference

Teachable resolver. More...

#include <fstream>
#include <vector>
#include <map>
#include <stdexcept>
#include "sclasses.hh"
#include <signal.h>
#include <random>
#include "record-types.hh"
#include <thread>

Include dependency graph for tres.cc:

Classes
struct	TooManyQueriesException
	Thrown if too many queries have been sent. More...
struct	NxdomainException
	this is a different kind of error: we KNOW your name does not exist More...
struct	NodataException
	Or if your type does not exist. More...
struct	ResolveRR
	This describes a single resource record. More...
struct	ResolveResult
	This is the end result of our resolving work. More...

Functions
DNSMessageReader	getResponse (const ComboAddress &server, const DNSName &dn, const DNSType &dt, int depth=0)
ResolveResult	resolveAt (const DNSName &dn, const DNSType &dt, int depth=0, const DNSName &auth={}, const multimap< DNSName, ComboAddress > &mservers=g_root)
void	processQuery (int sock, ComboAddress client, DNSMessageReader dmr)
	This is a thread that will create an answer to the query in dmr More...
int	main (int argc, char **argv)

Variables
multimap< DNSName, ComboAddress >	g_root
unsigned int	g_numqueries
bool g_skipIPv6	false
	set this if you have no functioning IPv6 More...
ofstream	g_dot

Detailed Description

Teachable resolver.

Function Documentation

DNSMessageReader getResponse	(	const ComboAddress &	server,
		const DNSName &	dn,
		const DNSType &	dt,
		int	depth = 0
	)

This function guarantees that you will get an answer from this server. It will drop EDNS for you and eventually it will even fall back to TCP for you. If nothing works, an exception is thrown. Note that this function does not think about actual DNS errors, you get those back verbatim. Only the TC bit is checked.

This function does check if the ID field of the response matches the query, but the caller should check qname and qtype.

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int main	(	int	argc,
		char **	argv
	)

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void processQuery	(	int	sock,
		ComboAddress	client,
		DNSMessageReader	dmr
	)

This is a thread that will create an answer to the query in dmr

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ResolveResult resolveAt	(	const DNSName &	dn,
		const DNSType &	dt,
		int	depth = 0,
		const DNSName &	auth = {},
		const multimap< DNSName, ComboAddress > &	mservers = g_root
	)

This attempts to look up the name dn with type dt. The depth parameter is for trace output. the 'auth' field describes the authority of the servers we will be talking to. Defaults to root ('believe everything') The multimap specifies the servers to try with. Defaults to a list of root-servers.

Variable Documentation

bool g_skipIPv6 false

set this if you have no functioning IPv6

ofstream g_dot

unsigned int g_numqueries

multimap<DNSName, ComboAddress> g_root