| 1 | /// ----------------------------------------*- mode: C++; -*--
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| 2 | /// @file threadsafe_db.h
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| 3 | /// Thread-safe netdb access
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| 4 | /// ----------------------------------------------------------
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| 5 | /// $Id: threadsafe_db.h 2549 2007-04-02 22:17:37Z bless $
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| 6 | /// $HeadURL: https://svn.ipv6.tm.uka.de/nsis/protlib/trunk/include/threadsafe_db.h $
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| 7 | // ===========================================================
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| 8 | //
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| 9 | // Copyright (C) 2005-2007, all rights reserved by
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| 10 | // - Institute of Telematics, Universitaet Karlsruhe (TH)
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| 11 | //
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| 12 | // More information and contact:
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| 13 | // https://projekte.tm.uka.de/trac/NSIS
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| 14 | //
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| 15 | // This program is free software; you can redistribute it and/or modify
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| 16 | // it under the terms of the GNU General Public License as published by
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| 17 | // the Free Software Foundation; version 2 of the License
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| 18 | //
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| 19 | // This program is distributed in the hope that it will be useful,
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| 20 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 21 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 22 | // GNU General Public License for more details.
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| 23 | //
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| 24 | // You should have received a copy of the GNU General Public License along
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| 25 | // with this program; if not, write to the Free Software Foundation, Inc.,
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| 26 | // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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| 27 | //
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| 28 | // ===========================================================
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| 29 | /** @ingroup protlib
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| 30 | *
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| 31 | * Thread-safe netdb access for linux.
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| 32 | *
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| 33 | * As the reentrant functions for netdb access seem not portable, I decided to
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| 34 | * write some wrappers for those functions I need. This is not
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| 35 | * object-oriented because the NetDB would be another singleton object and
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| 36 | * I only want some wrapper functions.
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| 37 | */
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| 38 |
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| 39 | #ifndef THREADSAFE_DB_H
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| 40 | #define THREADSAFE_DB_H
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| 41 |
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| 42 | #include <sys/types.h>
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| 43 | #include <pthread.h>
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| 44 | #include <netinet/in.h>
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| 45 | #include <string>
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| 46 |
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| 47 | #include "protlib_types.h"
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| 48 |
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| 49 | namespace protlib {
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| 50 |
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| 51 | /** @addtogroup protlib
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| 52 | * @{
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| 53 | */
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| 54 |
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| 55 | /// Thread-safe DB
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| 56 | /** This class provides class methods for accessing the protocol database
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| 57 | * and maybe other services from netdb.h in a thread-safe way.
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| 58 | */
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| 59 | class tsdb {
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| 60 | private:
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| 61 | /// init state
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| 62 | static bool is_init;
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| 63 | /// enable/disable name resolving via DNS
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| 64 | static bool resolvenames;
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| 65 |
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| 66 | /// netdb mutex
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| 67 | static pthread_mutex_t mutex;
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| 68 | // @{
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| 69 | /// last used IDs
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| 70 | static uint32 id32;
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| 71 | static uint64 id64;
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| 72 | // @}
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| 73 |
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| 74 | // standard protocol ids
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| 75 | static protocol_t udp_id;
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| 76 | static protocol_t tcp_id;
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| 77 | static protocol_t sctp_id;
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| 78 |
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| 79 | public:
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| 80 | /// initialize netdb
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| 81 | static void init(bool noresolving= false);
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| 82 | /// cleanup netdb resources
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| 83 | static void end();
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| 84 | /// get new 32bit-ID
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| 85 | static uint32 get_new_id32();
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| 86 | /// get new 64bit-ID
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| 87 | static uint64 get_new_id64();
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| 88 | /// get protocol name by number
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| 89 | static string getprotobynumber(protocol_t proto, bool *res = NULL);
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| 90 | /// get protocol number by name
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| 91 | static protocol_t getprotobyname(const string &pname, bool *res = NULL);
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| 92 | /// get protocol number by name
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| 93 | static protocol_t getprotobyname(const char* pname, bool *res = NULL);
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| 94 | /// get frequently used protocol numbers
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| 95 | static protocol_t get_udp_id() { return udp_id; }
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| 96 | static protocol_t get_tcp_id() { return tcp_id; }
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| 97 | static protocol_t get_sctp_id() { return sctp_id; }
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| 98 |
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| 99 | /// get user name
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| 100 | static string get_username(uid_t uid, bool *res = NULL);
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| 101 | /// get user ID
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| 102 | static uid_t get_userid(const char* uname, bool *res = NULL);
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| 103 | /// get user ID
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| 104 | static uid_t get_userid(const string& uname, bool *res = NULL);
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| 105 | /// get port name
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| 106 | static string get_portname(port_t port, protocol_t prot, bool *res = NULL);
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| 107 | /// get port number
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| 108 | static port_t get_portnumber(const char* pname, protocol_t prot, bool *res = NULL);
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| 109 | /// get port number
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| 110 | static port_t get_portnumber(const string& pname, protocol_t prot, bool *res = NULL);
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| 111 | /// lookup host name
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| 112 | static string get_hostname(const struct sockaddr* sa, bool *res);
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| 113 | static string get_hostname(const in_addr& in, bool *res = NULL);
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| 114 | static string get_hostname(const in6_addr& in, bool *res = NULL);
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| 115 |
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| 116 | }; // end class tsdb
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| 117 |
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| 118 | //@}
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| 119 |
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| 120 | } // end namespace protlib
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| 121 |
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| 122 | #endif
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