source: trash/old-modules/transport/protlib/threadsafe_db.h@ 5967

Last change on this file since 5967 was 5641, checked in by Christoph Mayer, 15 years ago
File size: 3.9 KB
Line 
1/// ----------------------------------------*- mode: C++; -*--
2/// @file threadsafe_db.h
3/// Thread-safe netdb access
4/// ----------------------------------------------------------
5/// $Id: threadsafe_db.h 2549 2007-04-02 22:17:37Z bless $
6/// $HeadURL: https://svn.ipv6.tm.uka.de/nsis/protlib/trunk/include/threadsafe_db.h $
7// ===========================================================
8//
9// Copyright (C) 2005-2007, all rights reserved by
10// - Institute of Telematics, Universitaet Karlsruhe (TH)
11//
12// More information and contact:
13// https://projekte.tm.uka.de/trac/NSIS
14//
15// This program is free software; you can redistribute it and/or modify
16// it under the terms of the GNU General Public License as published by
17// the Free Software Foundation; version 2 of the License
18//
19// This program is distributed in the hope that it will be useful,
20// but WITHOUT ANY WARRANTY; without even the implied warranty of
21// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22// GNU General Public License for more details.
23//
24// You should have received a copy of the GNU General Public License along
25// with this program; if not, write to the Free Software Foundation, Inc.,
26// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27//
28// ===========================================================
29/** @ingroup netdb
30 *
31 * Thread-safe netdb access for linux.
32 *
33 * As the reentrant functions for netdb access seem not portable, I decided to
34 * write some wrappers for those functions I need. This is not
35 * object-oriented because the NetDB would be another singleton object and
36 * I only want some wrapper functions.
37 */
38
39#ifndef THREADSAFE_DB_H
40#define THREADSAFE_DB_H
41
42#include <sys/types.h>
43#include <pthread.h>
44#include <netinet/in.h>
45#include <string>
46
47#include "protlib_types.h"
48
49namespace protlib {
50
51/** @addtogroup netdb Thread-safe DB
52 * @{
53 */
54
55/// Thread-safe DB
56/** This class provides class methods for accessing the protocol database
57 * and maybe other services from netdb.h in a thread-safe way.
58 */
59class tsdb {
60private:
61 /// init state
62 static bool is_init;
63 /// enable/disable name resolving via DNS
64 static bool resolvenames;
65
66 /// netdb mutex
67 static pthread_mutex_t mutex;
68 // @{
69 /// last used IDs
70 static uint32 id32;
71 static uint64 id64;
72 // @}
73
74 // standard protocol ids
75 static protocol_t udp_id;
76 static protocol_t tcp_id;
77 static protocol_t sctp_id;
78
79public:
80 /// initialize netdb
81 static void init(bool noresolving= false);
82 /// cleanup netdb resources
83 static void end();
84 /// get new 32bit-ID
85 static uint32 get_new_id32();
86 /// get new 64bit-ID
87 static uint64 get_new_id64();
88 /// get protocol name by number
89 static string getprotobynumber(protocol_t proto, bool *res = NULL);
90 /// get protocol number by name
91 static protocol_t getprotobyname(const string &pname, bool *res = NULL);
92 /// get protocol number by name
93 static protocol_t getprotobyname(const char* pname, bool *res = NULL);
94 /// get frequently used protocol numbers
95 static protocol_t get_udp_id() { return udp_id; }
96 static protocol_t get_tcp_id() { return tcp_id; }
97 static protocol_t get_sctp_id() { return sctp_id; }
98
99 /// get user name
100 static string get_username(uid_t uid, bool *res = NULL);
101 /// get user ID
102 static uid_t get_userid(const char* uname, bool *res = NULL);
103 /// get user ID
104 static uid_t get_userid(const string& uname, bool *res = NULL);
105 /// get port name
106 static string get_portname(port_t port, protocol_t prot, bool *res = NULL);
107 /// get port number
108 static port_t get_portnumber(const char* pname, protocol_t prot, bool *res = NULL);
109 /// get port number
110 static port_t get_portnumber(const string& pname, protocol_t prot, bool *res = NULL);
111 /// lookup host name
112 static string get_hostname(const struct sockaddr* sa, bool *res);
113 static string get_hostname(const in_addr& in, bool *res = NULL);
114 static string get_hostname(const in6_addr& in, bool *res = NULL);
115
116}; // end class tsdb
117
118//@}
119
120} // end namespace protlib
121
122#endif
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