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96779587 CH |
1 | /* |
2 | The software in this package is distributed under the GNU General | |
3 | Public License version 2 (with a special exception described below). | |
4 | ||
5 | A copy of GNU General Public License (GPL) is included in this distribution, | |
6 | in the file COPYING.GPL. | |
7 | ||
8 | As a special exception, if other files instantiate templates or use macros | |
9 | or inline functions from this file, or you compile this file and link it | |
10 | with other works to produce a work based on this file, this file | |
11 | does not by itself cause the resulting work to be covered | |
12 | by the GNU General Public License. | |
13 | ||
14 | However the source code for this file must still be made available | |
15 | in accordance with section (3) of the GNU General Public License. | |
16 | ||
17 | This exception does not invalidate any other reasons why a work based | |
18 | on this file might be covered by the GNU General Public License. | |
19 | ||
20 | Christian Herdtweck, Intra2net AG 2015 | |
21 | */ | |
22 | ||
23 | #ifndef DNS_CACHE_H | |
24 | #define DNS_CACHE_H | |
25 | ||
26 | #include <map> | |
27 | ||
28 | #include <boost/shared_ptr.hpp> | |
29 | #include <boost/asio/deadline_timer.hpp> | |
30 | #include <boost/system/error_code.hpp> | |
31 | ||
32 | #include "host/pinger.h" // for IoserviceItem | |
33 | #include "dns/hostaddress.h" | |
dbe986b9 | 34 | #include "dns/timetolive.h" |
96779587 | 35 | |
4e7b6ff9 | 36 | typedef std::vector<HostAddress> HostAddressVec; |
ad83004d | 37 | typedef std::map<std::string, HostAddressVec> ip_map_type; |
dbe986b9 CH |
38 | typedef std::pair<std::string, TimeToLive> Cname; |
39 | typedef std::map<std::string, Cname> cname_map_type; | |
40 | ||
96779587 CH |
41 | |
42 | class DnsCache | |
43 | { | |
44 | public: | |
45 | DnsCache( const IoServiceItem &io_serv, | |
46 | const std::string &cache_file ); | |
47 | ~DnsCache(); | |
48 | ||
49 | // accessed from ResolverBase subclasses | |
ad83004d | 50 | void update(const std::string &hostname, const HostAddressVec &new_data); |
dbe986b9 CH |
51 | void update(const std::string &hostname, const Cname &cname); |
52 | void update(const std::string &hostname, const uint32_t ttl); | |
53 | HostAddressVec get_ips(const std::string &hostname, | |
54 | const bool check_up_to_date=false); | |
55 | std::string get_cname(const std::string &hostname, | |
56 | const bool check_up_to_date=false); | |
57 | HostAddressVec get_ips_recursive(const std::string &hostname, | |
58 | const bool check_up_to_date=false); | |
96779587 CH |
59 | |
60 | // variables | |
61 | private: | |
ad83004d CH |
62 | ip_map_type IpCache; |
63 | cname_map_type CnameCache; | |
96779587 CH |
64 | boost::asio::deadline_timer SaveTimer; |
65 | std::string CacheFile; | |
66 | bool HasChanged; | |
67 | ||
68 | // functions | |
69 | private: | |
70 | void schedule_save(const boost::system::error_code &error); | |
71 | void save_to_cachefile(); | |
72 | void load_from_cachefile(); | |
73 | ||
74 | }; | |
75 | ||
76 | typedef boost::shared_ptr<DnsCache> DnsCacheItem; | |
77 | ||
78 | #endif | |
79 | ||
80 | // (created using vim -- the world's best text editor) | |
81 |