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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> | |
23f51766 CH |
31 | #include <boost/archive/xml_oarchive.hpp> |
32 | #include <boost/archive/xml_iarchive.hpp> | |
96779587 CH |
33 | |
34 | #include "host/pinger.h" // for IoserviceItem | |
35 | #include "dns/hostaddress.h" | |
8d26221d | 36 | #include "dns/cname.h" |
96779587 | 37 | |
4e7b6ff9 | 38 | typedef std::vector<HostAddress> HostAddressVec; |
ad83004d | 39 | typedef std::map<std::string, HostAddressVec> ip_map_type; |
dbe986b9 CH |
40 | typedef std::map<std::string, Cname> cname_map_type; |
41 | ||
23f51766 CH |
42 | // ----------------------------------------------------------------------------- |
43 | // DnsCache | |
44 | // ----------------------------------------------------------------------------- | |
45 | ||
96779587 CH |
46 | class DnsCache |
47 | { | |
48 | public: | |
8d26221d CH |
49 | /// constant to give as cache_file arg to DnsCache constructor |
50 | /// indicating that no cache file should be used | |
51 | static const std::string DoNotUseCacheFile; | |
52 | ||
96779587 | 53 | DnsCache( const IoServiceItem &io_serv, |
f833126b CH |
54 | const std::string &cache_file, |
55 | const uint32_t min_time_between_resolves ); | |
96779587 CH |
56 | ~DnsCache(); |
57 | ||
58 | // accessed from ResolverBase subclasses | |
26b0f687 | 59 | void update(const std::string &hostname, const HostAddressVec &new_ips); |
dbe986b9 | 60 | void update(const std::string &hostname, const Cname &cname); |
23f51766 CH |
61 | |
62 | // retrieval | |
dbe986b9 | 63 | HostAddressVec get_ips(const std::string &hostname, |
23f51766 CH |
64 | const bool check_up_to_date=false); |
65 | Cname get_cname(const std::string &hostname, | |
66 | const bool check_up_to_date=false); | |
dbe986b9 | 67 | HostAddressVec get_ips_recursive(const std::string &hostname, |
23f51766 CH |
68 | const bool check_up_to_date=false); |
69 | std::string get_first_outdated_cname(const std::string &hostname, | |
70 | const uint32_t ttl_thresh); | |
96779587 CH |
71 | |
72 | // variables | |
73 | private: | |
ad83004d CH |
74 | ip_map_type IpCache; |
75 | cname_map_type CnameCache; | |
96779587 CH |
76 | boost::asio::deadline_timer SaveTimer; |
77 | std::string CacheFile; | |
78 | bool HasChanged; | |
f833126b | 79 | uint32_t MinTimeBetweenResolves; |
96779587 | 80 | |
23f51766 | 81 | // internal functions |
96779587 CH |
82 | private: |
83 | void schedule_save(const boost::system::error_code &error); | |
84 | void save_to_cachefile(); | |
85 | void load_from_cachefile(); | |
26b0f687 | 86 | std::string key_for_hostname(const std::string &hostname) const; |
96779587 CH |
87 | |
88 | }; | |
89 | ||
90 | typedef boost::shared_ptr<DnsCache> DnsCacheItem; | |
91 | ||
92 | #endif | |
93 |