1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
// Copyright (C) 2009 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
#include <config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <errno.h>
#include <string>
#include <iostream>
#include <boost/foreach.hpp>
#include <asiodns/asiodns.h>
#include <asiolink/asiolink.h>
#include <exceptions/exceptions.h>
#include <util/buffer.h>
#include <dns/rcode.h>
#include <dns/message.h>
#include <dns/messagerenderer.h>
#include <cc/session.h>
#include <cc/data.h>
#include <config/ccsession.h>
#include <server_common/socket_request.h>
#include <xfr/xfrout_client.h>
#include <auth/change_user.h>
#include <auth/common.h>
#include <resolver/spec_config.h>
#include <resolver/resolver.h>
#include <cache/resolver_cache.h>
#include <nsas/nameserver_address_store.h>
#include <log/logger_support.h>
#include <log/logger_level.h>
#include "resolver_log.h"
using namespace std;
using namespace isc::cc;
using namespace isc::config;
using namespace isc::data;
using namespace isc::asiodns;
using namespace isc::asiolink;
namespace {
static const string PROGRAM = "Resolver";
IOService io_service;
static boost::shared_ptr<Resolver> resolver;
ConstElementPtr
my_config_handler(ConstElementPtr new_config) {
return (resolver->updateConfig(new_config));
}
ConstElementPtr
my_command_handler(const string& command, ConstElementPtr args) {
ConstElementPtr answer = createAnswer();
if (command == "print_message") {
LOG_INFO(resolver_logger, RESOLVER_PRINT_COMMAND).arg(args);
/* let's add that message to our answer as well */
answer = createAnswer(0, args);
} else if (command == "shutdown") {
io_service.stop();
}
return (answer);
}
void
usage() {
cerr << "Usage: b10-resolver [-u user] [-v]" << endl;
cerr << "\t-u: change process UID to the specified user" << endl;
cerr << "\t-v: verbose output" << endl;
exit(1);
}
} // end of anonymous namespace
int
main(int argc, char* argv[]) {
bool verbose = false;
int ch;
const char* uid = NULL;
while ((ch = getopt(argc, argv, "u:v")) != -1) {
switch (ch) {
case 'u':
uid = optarg;
break;
case 'v':
verbose = true;
break;
case '?':
default:
usage();
}
}
if (argc - optind > 0) {
usage();
}
// Until proper logging comes along, initialize the logging with the
// temporary initLogger() code. If verbose, we'll use maximum verbosity.
isc::log::initLogger("b10-resolver",
(verbose ? isc::log::DEBUG : isc::log::INFO),
isc::log::MAX_DEBUG_LEVEL, NULL);
// Print the starting message
string cmdline = argv[0];
for (int i = 1; i < argc; ++ i) {
cmdline = cmdline + " " + argv[i];
}
LOG_INFO(resolver_logger, RESOLVER_STARTING).arg(cmdline);
int ret = 0;
Session* cc_session = NULL;
ModuleCCSession* config_session = NULL;
try {
string specfile;
if (getenv("B10_FROM_BUILD")) {
specfile = string(getenv("B10_FROM_BUILD")) +
"/src/bin/resolver/resolver.spec";
} else {
specfile = string(RESOLVER_SPECFILE_LOCATION);
}
resolver = boost::shared_ptr<Resolver>(new Resolver());
LOG_DEBUG(resolver_logger, RESOLVER_DBG_INIT, RESOLVER_CREATED);
SimpleCallback* checkin = resolver->getCheckinProvider();
DNSLookup* lookup = resolver->getDNSLookupProvider();
DNSAnswer* answer = resolver->getDNSAnswerProvider();
isc::nsas::NameserverAddressStore nsas(resolver);
resolver->setNameserverAddressStore(nsas);
isc::cache::ResolverCache cache;
resolver->setCache(cache);
// TODO priming query, remove root from direct
// Fake a priming query result here (TODO2 how to flag non-expiry?)
// propagation to runningquery. And check for forwarder mode?
isc::dns::QuestionPtr root_question(new isc::dns::Question(
isc::dns::Name("."),
isc::dns::RRClass::IN(),
isc::dns::RRType::NS()));
isc::dns::RRsetPtr root_ns_rrset(new isc::dns::RRset(isc::dns::Name("."),
isc::dns::RRClass::IN(),
isc::dns::RRType::NS(),
isc::dns::RRTTL(8888)));
root_ns_rrset->addRdata(isc::dns::rdata::createRdata(isc::dns::RRType::NS(),
isc::dns::RRClass::IN(),
"l.root-servers.net."));
isc::dns::RRsetPtr root_a_rrset(new isc::dns::RRset(isc::dns::Name("l.root-servers.net"),
isc::dns::RRClass::IN(),
isc::dns::RRType::A(),
isc::dns::RRTTL(8888)));
root_a_rrset->addRdata(isc::dns::rdata::createRdata(isc::dns::RRType::A(),
isc::dns::RRClass::IN(),
"199.7.83.42"));
isc::dns::RRsetPtr root_aaaa_rrset(new isc::dns::RRset(isc::dns::Name("l.root-servers.net"),
isc::dns::RRClass::IN(),
isc::dns::RRType::AAAA(),
isc::dns::RRTTL(8888)));
root_aaaa_rrset->addRdata(isc::dns::rdata::createRdata(isc::dns::RRType::AAAA(),
isc::dns::RRClass::IN(),
"2001:500:3::42"));
isc::dns::MessagePtr priming_result(new isc::dns::Message(isc::dns::Message::RENDER));
priming_result->setRcode(isc::dns::Rcode::NOERROR());
priming_result->addQuestion(root_question);
priming_result->addRRset(isc::dns::Message::SECTION_ANSWER, root_ns_rrset);
priming_result->addRRset(isc::dns::Message::SECTION_ADDITIONAL, root_a_rrset);
priming_result->addRRset(isc::dns::Message::SECTION_ADDITIONAL, root_aaaa_rrset);
cache.update(*priming_result);
cache.update(root_ns_rrset);
cache.update(root_a_rrset);
cache.update(root_aaaa_rrset);
DNSService dns_service(io_service, checkin, lookup, answer);
resolver->setDNSService(dns_service);
LOG_DEBUG(resolver_logger, RESOLVER_DBG_INIT, RESOLVER_SERVICE_CREATED);
cc_session = new Session(io_service.get_io_service());
config_session = new ModuleCCSession(specfile, *cc_session,
my_config_handler,
my_command_handler);
isc::server_common::SocketRequestor::init(*config_session);
LOG_DEBUG(resolver_logger, RESOLVER_DBG_INIT, RESOLVER_CONFIG_CHANNEL);
// FIXME: This does not belong here, but inside Boss
if (uid != NULL) {
changeUser(uid);
}
resolver->setConfigSession(config_session);
// Install all initial configurations. If loading configuration
// fails, it will be logged, but we start the server anyway, giving
// the user a second chance to correct the configuration.
resolver->updateConfig(config_session->getFullConfig());
LOG_DEBUG(resolver_logger, RESOLVER_DBG_INIT, RESOLVER_CONFIG_LOADED);
LOG_INFO(resolver_logger, RESOLVER_STARTED);
io_service.run();
} catch (const std::exception& ex) {
LOG_FATAL(resolver_logger, RESOLVER_FAILED).arg(ex.what());
ret = 1;
}
delete config_session;
delete cc_session;
LOG_INFO(resolver_logger, RESOLVER_SHUTDOWN);
return (ret);
}
|
