180 lines
6.1 KiB
C++
180 lines
6.1 KiB
C++
/*
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Copyright (c) 2005-2015 by Jakob Schröter <js@camaya.net>
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This file is part of the gloox library. http://camaya.net/gloox
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This software is distributed under a license. The full license
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agreement can be found in the file LICENSE in this distribution.
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This software may not be copied, modified, sold or distributed
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other than expressed in the named license agreement.
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This software is distributed without any warranty.
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*/
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#ifndef DNS_H__
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#define DNS_H__
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#include "macros.h"
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#include "logsink.h"
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#ifdef __MINGW32__
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# include <windows.h>
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# include <windns.h>
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#endif
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#ifdef HAVE_ARPA_NAMESER_H
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# include <arpa/nameser.h>
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#endif
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#ifdef __APPLE__
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# include <arpa/nameser_compat.h>
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#endif
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#ifndef NS_MAXDNAME
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# define NS_MAXDNAME 1025
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#endif
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#ifndef NS_PACKETSZ
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# define NS_PACKETSZ 512
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#endif
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#ifdef HAVE_GETADDRINFO
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# include <sys/types.h>
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# include <sys/socket.h>
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# include <netdb.h>
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#endif
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#include <string>
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#include <map>
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namespace gloox
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{
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/**
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* @brief This class holds a number of static functions used for DNS related stuff.
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*
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* You should not need to use these functions directly.
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*
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* @author Jakob Schröter <js@camaya.net>
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* @since 0.3
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*/
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class GLOOX_API DNS
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{
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public:
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/**
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* A list of strings (used for server addresses) and ints (used for port numbers).
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*/
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typedef std::map<std::string, int> HostMap;
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/**
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* This function resolves a service/protocol/domain tuple.
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* @param service The SRV service type.
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* @param proto The SRV protocol.
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* @param domain The domain to search for SRV records.
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* @param logInstance A LogSink to use for logging.
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* @return A list of weighted hostname/port pairs from SRV records, or A records if no SRV
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* records where found.
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*/
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static HostMap resolve( const std::string& service, const std::string& proto,
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const std::string& domain, const LogSink& logInstance );
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/**
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* This is a convenience funtion which uses @ref resolve() to resolve SRV records
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* for a given domain, using a service of @b xmpp-client and a proto of @b tcp.
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* @param domain The domain to resolve SRV records for.
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* @param logInstance A LogSink to use for logging.
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* @return A list of weighted hostname/port pairs from SRV records, or A records if no SRV
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* records where found.
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*/
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static HostMap resolve( const std::string& domain, const LogSink& logInstance )
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{ return resolve( "xmpp-client", "tcp", domain, logInstance ); }
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/**
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* This is a convenience function which uses @ref resolve() to get a list of hosts
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* and connects to one of them.
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* @param host The host to resolve SRV records for.
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* @param logInstance A LogSink to use for logging.
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* @return A file descriptor for the established connection.
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*/
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static int connect( const std::string& host, const LogSink& logInstance );
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/**
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* This is a convenience function which connects to the given host and port. No SRV
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* records are resolved. Use this function for special setups.
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* @param host The host/IP address to connect to.
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* @param port A custom port to connect to.
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* @param logInstance A LogSink to use for logging.
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* @return A file descriptor for the established connection.
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*/
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static int connect( const std::string& host, int port, const LogSink& logInstance );
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/**
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* A convenience function that prepares and returnes a simple, unconnected TCP socket.
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* @param logInstance A LogSink to use for logging.
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* @return A TCP socket.
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*/
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static int getSocket( const LogSink& logInstance );
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/**
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* Closes the given socket.
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* @param fd The socket to close.
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* @param logInstance A LogSink to use for logging.
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*/
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static void closeSocket( int fd, const LogSink& logInstance );
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private:
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#ifdef HAVE_GETADDRINFO
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/**
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* Resolves the given service for the given domain and protocol, using the IPv6-ready
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* getaddrinfo(). The result is put into the first parameter.
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* @param res A pointer to a pointer holding the query results.
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* @param service A service string to query for, e.g. xmpp-client.
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* @param proto A protocol name.
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* @param domain The domain to query for.
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* @param logInstance A LogSink to use for logging.
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*/
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static void resolve( struct addrinfo** res, const std::string& service, const std::string& proto,
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const std::string& domain, const LogSink& logInstance );
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/**
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* This is a convenience funtion which uses @ref resolve() to resolve SRV records
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* for a given domain, using a service of @b xmpp-client and a proto of @b tcp.
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* @param res A pointer to a pointer holding the query results.
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* @param domain The domain to resolve SRV records for.
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* @param logInstance A LogSink to use for logging.
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*/
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static void resolve( struct addrinfo** res, const std::string& domain, const LogSink& logInstance )
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{ resolve( res, "xmpp-client", "tcp", domain, logInstance ); }
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/**
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* Tries to connect to the host/address contained in the addrinfo structure.
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* @param res The connection parameters.
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* @param logInstance A LogSink to use for logging.
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* @return A file descriptor for the established connection.
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*/
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static int connect( struct addrinfo* res, const LogSink& logInstance );
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#endif
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/**
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* This function prepares and returns a socket with the given parameters.
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* @param af The address family. E.g. PF_INET.
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* @param socktype The socket type. E.g. SOCK_STREAM.
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* @param proto The protocol number. E.g. 6 (TCP).
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*/
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static int getSocket( int af, int socktype, int proto, const LogSink& logInstance );
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static HostMap defaultHostMap( const std::string& domain, const LogSink& logInstance );
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static void cleanup( const LogSink& logInstance );
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struct buffer
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{
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unsigned char buf[NS_PACKETSZ];
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int len;
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};
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};
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}
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#endif // DNS_H__
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