-/* +------------------------------------+
- * | Inspire Internet Relay Chat Daemon |
- * +------------------------------------+
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ * Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
+ * Copyright (C) 2005-2008 Craig Edwards <craigedwards@brainbox.cc>
+ * Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
*
- * InspIRCd: (C) 2002-2007 InspIRCd Development Team
- * See: http://www.inspircd.org/wiki/index.php/Credits
+ * This file is part of InspIRCd. InspIRCd is free software: you can
+ * redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation, version 2.
*
- * This program is free but copyrighted software; see
- * the file COPYING for details.
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
*
- * ---------------------------------------------------
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+
/*
dns.h - dns library very very loosely based on
firedns, Copyright (C) 2002 Ian Gulliver
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
-#ifndef _DNS_H
-#define _DNS_H
+#ifndef DNS_H
+#define DNS_H
-#include <string>
-#include "inspircd_config.h"
-#include "base.h"
-#include "socketengine.h"
#include "socket.h"
-#include "hash_map.h"
#include "hashcomp.h"
-using namespace std;
-using irc::sockets::insp_aton;
-using irc::sockets::insp_ntoa;
-using irc::sockets::insp_sockaddr;
-using irc::sockets::insp_inaddr;
-
-class InspIRCd;
-class Module;
+/**
+ * Query and resource record types
+ */
+enum QueryType
+{
+ /** Uninitialized Query */
+ DNS_QUERY_NONE = 0,
+ /** 'A' record: an ipv4 address */
+ DNS_QUERY_A = 1,
+ /** 'CNAME' record: An alias */
+ DNS_QUERY_CNAME = 5,
+ /** 'PTR' record: a hostname */
+ DNS_QUERY_PTR = 12,
+ /** 'AAAA' record: an ipv6 address */
+ DNS_QUERY_AAAA = 28,
+
+ /** Force 'PTR' to use IPV4 scemantics */
+ DNS_QUERY_PTR4 = 0xFFFD,
+ /** Force 'PTR' to use IPV6 scemantics */
+ DNS_QUERY_PTR6 = 0xFFFE
+};
/**
* Result status, used internally
*/
-class CoreExport DNSResult : public classbase
+class CoreExport DNSResult
{
public:
/** Result ID
/** The original request, a hostname or IP address
*/
std::string original;
+ /** The type of the request
+ */
+ QueryType type;
/** Build a DNS result.
* @param i The request ID
* @param res The request result, a hostname or IP
* @param timetolive The request time-to-live
* @param orig The original request, a hostname or IP
+ * @param qt The type of DNS query this result represents.
*/
- DNSResult(int i, const std::string &res, unsigned long timetolive, const std::string &orig) : id(i), result(res), ttl(timetolive), original(orig) { }
+ DNSResult(int i, const std::string &res, unsigned long timetolive, const std::string &orig, QueryType qt = DNS_QUERY_NONE) : id(i), result(res), ttl(timetolive), original(orig), type(qt) { }
};
/**
/** The cached result data, an IP or hostname
*/
std::string data;
+ /** The type of result this is
+ */
+ QueryType type;
/** The time when the item is due to expire
*/
time_t expires;
/** Build a cached query
* @param res The result data, an IP or hostname
+ * @param qt The type of DNS query this instance represents.
* @param ttl The time-to-live value of the query result
*/
- CachedQuery(const std::string &res, unsigned int ttl) : data(res)
- {
- expires = time(NULL) + ttl;
- }
+ CachedQuery(const std::string &res, QueryType qt, unsigned int ttl);
/** Returns the number of seconds remaining before this
* cache item has expired and should be removed.
*/
- int CalcTTLRemaining()
- {
- int n = (int)expires - (int)time(NULL);
- return (n < 0 ? 0 : n);
- }
+ int CalcTTLRemaining();
};
/** DNS cache information. Holds IPs mapped to hostnames, and hostnames mapped to IPs.
*/
-#ifndef WIN32
-typedef nspace::hash_map<irc::string, CachedQuery, nspace::hash<irc::string> > dnscache;
-#else
-typedef nspace::hash_map<irc::string, CachedQuery, nspace::hash_compare<irc::string> > dnscache;
-#endif
+typedef nspace::hash_map<irc::string, CachedQuery, irc::hash> dnscache;
/**
* Error types that class Resolver can emit to its error method.
RESOLVER_NOERROR = 0,
RESOLVER_NSDOWN = 1,
RESOLVER_NXDOMAIN = 2,
- RESOLVER_NOTREADY = 3,
- RESOLVER_BADIP = 4,
- RESOLVER_TIMEOUT = 5,
- RESLOVER_FORCEUNLOAD = 6
+ RESOLVER_BADIP = 3,
+ RESOLVER_TIMEOUT = 4,
+ RESOLVER_FORCEUNLOAD = 5
};
-/**
- * A DNS request
- */
-class DNSRequest;
-
-/**
- * A DNS packet header
- */
-class DNSHeader;
-
-/**
- * A DNS Resource Record (rr)
- */
-struct ResourceRecord;
-
-/**
- * Query and resource record types
- */
-enum QueryType
-{
- DNS_QUERY_NONE = 0, /* Uninitialized Query */
- DNS_QUERY_A = 1, /* 'A' record: an ipv4 address */
- DNS_QUERY_CNAME = 5, /* 'CNAME' record: An alias */
- DNS_QUERY_PTR = 12, /* 'PTR' record: a hostname */
- DNS_QUERY_AAAA = 28, /* 'AAAA' record: an ipv6 address */
-
- DNS_QUERY_PTR4 = 0xFFFD, /* Force 'PTR' to use IPV4 scemantics */
- DNS_QUERY_PTR6 = 0xFFFE /* Force 'PTR' to use IPV6 scemantics */
-};
-
-#ifdef IPV6
-const QueryType DNS_QUERY_FORWARD = DNS_QUERY_AAAA;
-#else
-const QueryType DNS_QUERY_FORWARD = DNS_QUERY_A;
-#endif
-const QueryType DNS_QUERY_REVERSE = DNS_QUERY_PTR;
/**
* Used internally to force PTR lookups to use a certain protocol scemantics,
* e.g. x.x.x.x.in-addr.arpa for v4, and *.ip6.arpa for v6.
*/
enum ForceProtocol
{
- PROTOCOL_IPV4 = 0, /* Forced to use ipv4 */
- PROTOCOL_IPV6 = 1 /* Forced to use ipv6 */
+ /** Forced to use ipv4 */
+ PROTOCOL_IPV4 = 0,
+ /** Forced to use ipv6 */
+ PROTOCOL_IPV6 = 1
};
/**
* can occur by calling virtual methods, one is a success situation, and the other
* an error situation.
*/
-class CoreExport Resolver : public Extensible
+class CoreExport Resolver
{
protected:
- /**
- * Pointer to creator
- */
- InspIRCd* ServerInstance;
/**
* Pointer to creator module (if any, or NULL)
*/
- Module* Creator;
+ ModuleRef Creator;
/**
* The input data, either a host or an IP address
*/
* Time left before cache expiry
*/
int time_left;
+
public:
/**
* Initiate DNS lookup. Your class should not attempt to delete or free these
* the object to go 'out of scope' and cause a segfault in the core if the result
* arrives at a later time.
* @param source The IP or hostname to resolve
- * @param qt The query type to perform. If you just want to perform a forward
- * or reverse lookup, and you don't care wether you get ipv4 or ipv6, then use
- * the constants DNS_QUERY_FORWARD and DNS_QUERY_REVERSE, which automatically
- * select from 'A' record or 'AAAA' record lookups. However, if you want to resolve
- * a specific record type, resolution of 'A', 'AAAA', 'PTR' and 'CNAME' records
+ * @param qt The query type to perform. Resolution of 'A', 'AAAA', 'PTR' and 'CNAME' records
* is supported. Use one of the QueryType enum values to initiate this type of
* lookup. Resolution of 'AAAA' ipv6 records is always supported, regardless of
* wether InspIRCd is built with ipv6 support.
- * If you attempt to resolve a 'PTR' record using DNS_QUERY_PTR, and InspIRCd is
- * built with ipv6 support, the 'PTR' record will be formatted to ipv6 specs,
- * e.g. x.x.x.x.x....ip6.arpa. otherwise it will be formatted to ipv4 specs,
- * e.g. x.x.x.x.in-addr.arpa. This translation is automatic.
- * To get around this automatic behaviour, you must use one of the values
- * DNS_QUERY_PTR4 or DNS_QUERY_PTR6 to force ipv4 or ipv6 behaviour on the lookup,
- * irrespective of what protocol InspIRCd has been built for.
+ * To look up reverse records, specify one of DNS_QUERY_PTR4 or DNS_QUERY_PTR6 depending
+ * on the type of address you are looking up.
* @param cached The constructor will set this boolean to true or false depending
* on whether the DNS lookup you are attempting is cached (and not expired) or not.
* If the value is cached, upon return this will be set to true, otherwise it will
* whilst lookups are in progress, they can be safely removed and your module will not
* crash the server.
*/
- Resolver(InspIRCd* Instance, const std::string &source, QueryType qt, bool &cached, Module* creator = NULL);
+ Resolver(const std::string &source, QueryType qt, bool &cached, Module* creator);
/**
* The default destructor does nothing.
*/
virtual ~Resolver();
+
/**
* When your lookup completes, this method will be called.
* @param result The resulting DNS lookup, either an IP address or a hostname.
* from the DNS server.
*/
virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached) = 0;
+
/**
* If an error occurs (such as NXDOMAIN, no domain name found) then this method
* will be called.
* @param errormessage The error text of the error that occured.
*/
virtual void OnError(ResolverError e, const std::string &errormessage);
+
/**
* Returns the id value of this class. This is primarily used by the core
* to determine where in various tables to place a pointer to your class, but it
* this method will return -1.
*/
int GetId();
+
/**
* Returns the creator module, or NULL
*/
Module* GetCreator();
+
/**
* If the result is a cached result, this triggers the objects
* OnLookupComplete. This is done because it is not safe to call
{
private:
- /**
- * Creator/Owner object
- */
- InspIRCd* ServerInstance;
-
/**
* The maximum value of a dns request id,
* 16 bits wide, 0xFFFF.
*/
static const int MAX_REQUEST_ID = 0xFFFF;
- /**
- * A counter used to form part of the pseudo-random id
+ /** Maximum number of entries in cache
*/
- int currid;
-
- /**
- * We have to turn off a few checks on received packets
- * when people are using 4in6 (e.g. ::ffff:xxxx). This is
- * a temporary kludge, Please let me know if you know how
- * to fix it.
- */
- bool ip6munge;
+ static const unsigned int MAX_CACHE_SIZE = 1000;
/**
* Currently cached items
public:
- /**
- * Server address being used currently
- */
- int socketfamily;
-#ifdef IPV6
- in6_addr myserver6;
-#endif
- in_addr myserver4;
+ irc::sockets::sockaddrs myserver;
/**
* Currently active Resolver classes
*/
int GetIP(const char* name);
- /**
- * Start the lookup of a hostname from an ip,
- * always using the protocol inspircd is built for,
- * e.g. use ipv6 reverse lookup when built for ipv6,
- * or ipv4 lookup when built for ipv4.
- */
- int GetName(const insp_inaddr* ip);
-
/**
* Start lookup of a hostname from an ip, but
* force a specific protocol to be used for the lookup
* The constructor initialises the dns socket,
* and clears the request lists.
*/
- DNS(InspIRCd* Instance);
+ DNS();
/**
* Re-initialize the DNS subsystem.
*/
~DNS();
- /** Portable random number generator, generates
- * its random number from the ircd stats counters,
- * effective user id, time of day and the rollover
- * counter (currid)
- */
- unsigned long PRNG();
-
/**
* Turn an in6_addr into a .ip6.arpa domain
*/
projects / user / henk / code / inspircd.git / blobdiff