GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/network/dns.cc
Date: 2026-08-02 02:40:19
Exec Total Coverage
Lines: 616 698 88.3%
Branches: 513 806 63.6%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 *
4 * The CernVM-FS name resolving uses objects that inherit from the Resolver
5 * interface. Resolvers implement a vector interface that resolves multiple
6 * names in parallel. Common cases such as IP addresses as names are handled
7 * by the base class -- Resolver implementations only have to resolve real host
8 * names to IPv4/6 addresses, using given search domains if necessary.
9 *
10 * Name resolving information is stored in Host objects. Host objects are
11 * immutable. They associate a hostname with sets of IPv4 and IPv6 addresses.
12 * They also carry the result of the name resolution attempt (success, failure)
13 * and the TTL in the form of a deadline. They are only created by a resolver
14 * and upon creation carry a unique id that corresponds to a particular name
15 * resolving attempt.
16 *
17 * The NormalResolver uses both the CaresResolver for DNS queries and the
18 * HostfileResolve for queries in /etc/hosts. If an entry is found in
19 * /etc/hosts, the CaresResolver is unused.
20 */
21
22 #include "dns.h"
23
24 #include <arpa/inet.h>
25 #include <arpa/nameser.h>
26 #include <errno.h>
27 #include <netdb.h>
28 #include <poll.h>
29 #include <unistd.h>
30
31 #include <algorithm>
32 #include <cassert>
33 #include <cstdio>
34 #include <cstdlib>
35 #include <cstring>
36
37 #include "sanitizer.h"
38 #include "util/exception.h"
39 #include "util/logging.h"
40 #include "util/smalloc.h"
41 #include "util/string.h"
42
43 using namespace std; // NOLINT
44
45 namespace dns {
46
47 /**
48 * Sets pos_begin and pos_end to the first/last character of the host name in
49 * a string like http://<hostname>:<port>. Works also if the host name is an
50 * IPv4/6 address. Sets pos_begin and pos_end to 0 if url doesn't match the
51 * format.
52 */
53 7086 static void PinpointHostSubstr(const std::string &url,
54 unsigned *pos_begin,
55 unsigned *pos_end) {
56 7086 *pos_begin = *pos_end = 0;
57 7086 const unsigned len = url.size();
58 7086 unsigned i = 0;
59
60 // Search '//' in the url string and jump behind
61
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 45110 for (; i < len; ++i) {
62
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 42804 if ((url[i] == '/') && (i < len - 2) && (url[i + 1] == '/')) {
63 4780 i += 2;
64 4780 *pos_begin = i;
65 4780 break;
66 }
67 }
68
69 // Search '@' within the hostname part and jump behind if present
70
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 7086 if (*pos_begin > 0) {
71
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 68060 for (i = *pos_begin; i < len; ++i) {
72
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 63504 if (url[i] == '/') {
73 184 break;
74
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 63320 } else if (url[i] == '@') {
75 40 *pos_begin = ++i;
76 40 break;
77 }
78 }
79 }
80
81 // Find the end of the hostname part
82
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 7086 if (*pos_begin > 0) {
83 4780 bool in_ipv6 = (url[*pos_begin] == '[');
84
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 46032 for (i = *pos_begin; i < len; ++i) {
85
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 45880 if (in_ipv6) {
86
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 880 if (url[i] != ']')
87 712 continue;
88 168 in_ipv6 = false;
89 }
90
91
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 45168 if ((url[i] == ':') || (url[i] == '/'))
92 4628 break;
93 }
94
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 4780 if (!in_ipv6)
95 4732 *pos_end = i - 1;
96
97
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 4780 if (*pos_end < *pos_begin)
98 144 *pos_end = *pos_begin = 0;
99 }
100 7086 }
101
102
103 /**
104 * Returns the host name from a string in the format
105 * http://<hostname>:<port>[/path]
106 * or an empty string if url doesn't match the format.
107 */
108 4444 std::string ExtractHost(const std::string &url) {
109 unsigned pos_begin;
110 unsigned pos_end;
111 4444 PinpointHostSubstr(url, &pos_begin, &pos_end);
112
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 4444 if (pos_begin == 0)
113
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 2194 return "";
114
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 2250 return url.substr(pos_begin, (pos_end - pos_begin) + 1);
115 }
116
117
118 /**
119 * Returns the port from a string in the format
120 * http://<hostname>:<port>/path
121 * or an empty string if url doesn't match the format.
122 */
123 2474 std::string ExtractPort(const std::string &url) {
124 unsigned pos_begin;
125 unsigned pos_end;
126 2474 PinpointHostSubstr(url, &pos_begin, &pos_end);
127
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 2474 if (pos_begin == 0 || pos_end + 2 >= url.size() || url.at(pos_end + 1) != ':')
128
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 248 return "";
129
130 // Do not include path
131 2226 const std::size_t pos_port = url.find("/", pos_end);
132 2226 std::string retme;
133
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 2226 if (pos_port == std::string::npos)
134
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 2178 retme = url.substr(pos_end + 2);
135 else
136
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 48 retme = url.substr(pos_end + 2, pos_port - pos_end - 2);
137
138 // Port is an integer
139
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 10770 for (std::string::iterator it = retme.begin(); it != retme.end(); ++it)
140
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 8576 if (isdigit(*it) == 0)
141
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 32 return "";
142
143 2194 return retme;
144 2226 }
145
146
147 /**
148 * Replaces the host name in the url with the given IP address. If it is an
149 * IPv6 address, it has to be in brackets. If the input is not a valid URL,
150 * it is returned unmodified.
151 */
152 168 string RewriteUrl(const string &url, const string &ip) {
153 unsigned pos_begin;
154 unsigned pos_end;
155 168 PinpointHostSubstr(url, &pos_begin, &pos_end);
156
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 168 if (pos_begin == 0)
157
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 88 return url;
158
159
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 80 string result = url;
160
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 80 result.replace(pos_begin, (pos_end - pos_begin) + 1, ip);
161 80 return result;
162 80 }
163
164
165 /**
166 * Removes the brackets from IPv6 addresses. Leaves IPv4 addresses unchanged.
167 */
168 64 string StripIp(const string &decorated_ip) {
169
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 64 if (!decorated_ip.empty()) {
170 56 if ((decorated_ip[0] == '[')
171
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 56 && (decorated_ip[decorated_ip.length() - 1] == ']')) {
172 16 return decorated_ip.substr(1, decorated_ip.length() - 2);
173 }
174 }
175 48 return decorated_ip;
176 }
177
178
179 /**
180 * Adds http:// if it is missing from proxy
181 */
182 4348 std::string AddDefaultScheme(const std::string &proxy) {
183 4348 const bool ignore_case = true;
184
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 8696 if (HasPrefix(proxy, "http://", ignore_case)
185
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 8672 || HasPrefix(proxy, "https://", ignore_case) || (proxy == "DIRECT")
186
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 13020 || proxy.empty()) {
187 4324 return proxy;
188 }
189 24 return "http://" + proxy;
190 }
191
192
193 //------------------------------------------------------------------------------
194
195
196 atomic_int64 Host::global_id_ = 0;
197
198 80 const set<string> &Host::ViewBestAddresses(IpPreference preference) const {
199
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 48 if (((preference == kIpPreferSystem) || (preference == kIpPreferV4))
200
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 128 && HasIpv4()) {
201 40 return ipv4_addresses_;
202 }
203
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 40 if ((preference == kIpPreferV6) && !HasIpv6())
204 8 return ipv4_addresses_;
205 32 return ipv6_addresses_;
206 }
207
208
209 10701 void Host::CopyFrom(const Host &other) {
210 10701 deadline_ = other.deadline_;
211 10701 id_ = other.id_;
212 10701 ipv4_addresses_ = other.ipv4_addresses_;
213 10701 ipv6_addresses_ = other.ipv6_addresses_;
214 10701 name_ = other.name_;
215 10701 status_ = other.status_;
216 10701 }
217
218
219 /**
220 * Creates a copy of the original host with a new ID and sets a new dealine
221 * given in seconds from the current time.
222 */
223 8 Host Host::ExtendDeadline(const Host &original, unsigned seconds_from_now) {
224 8 Host new_host(original);
225 8 new_host.id_ = atomic_xadd64(&global_id_, 1);
226 8 new_host.deadline_ = time(NULL) + seconds_from_now;
227 8 return new_host;
228 }
229
230
231 /**
232 * All fields except the unique id_ are set by the resolver. Host objects
233 * can be copied around but only the resolver can create valid, new objects.
234 */
235 6110 Host::Host()
236 6110 : deadline_(0)
237 6110 , id_(atomic_xadd64(&global_id_, 1))
238 6110 , status_(kFailNotYetResolved) { }
239
240
241
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 9811 Host::Host(const Host &other) { CopyFrom(other); }
242
243
244 892 Host &Host::operator=(const Host &other) {
245
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 892 if (&other == this)
246 2 return *this;
247 890 CopyFrom(other);
248 890 return *this;
249 }
250
251
252 /**
253 * Compares the name and the resolved addresses independent of deadlines. Used
254 * to decide if the current proxy list needs to be changed after re-resolving
255 * a host name.
256 */
257 176 bool Host::IsEquivalent(const Host &other) const {
258
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 152 return (status_ == kFailOk) && (other.status_ == kFailOk)
259
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 144 && (name_ == other.name_) && (ipv4_addresses_ == other.ipv4_addresses_)
260
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 328 && (ipv6_addresses_ == other.ipv6_addresses_);
261 }
262
263
264 /**
265 * Compares the TTL from a provious call to time() with the current time.
266 */
267 120 bool Host::IsExpired() const {
268 120 const time_t now = time(NULL);
269
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 120 assert(now != static_cast<time_t>(-1));
270 120 return deadline_ < now;
271 }
272
273
274 /**
275 * A host object is valid after it has been successfully resolved and until the
276 * DNS ttl expires. Successful name resolution means that there is at least
277 * one IP address.
278 */
279 128 bool Host::IsValid() const {
280
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 128 if (status_ != kFailOk)
281 48 return false;
282
283
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 80 assert(!ipv4_addresses_.empty() || !ipv6_addresses_.empty());
284 80 return !IsExpired();
285 }
286
287
288 //------------------------------------------------------------------------------
289
290
291 /**
292 * Basic input validation to ensure that this could syntactically represent a
293 * valid IPv4 address.
294 */
295 24058 bool Resolver::IsIpv4Address(const string &address) {
296 // Are there any unexpected characters?
297
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 48116 const sanitizer::InputSanitizer sanitizer("09 .");
298
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 24058 if (!sanitizer.IsValid(address))
299 9512 return false;
300
301 // 4 octets in the range 0-255?
302
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 14546 vector<string> octets = SplitString(address, '.');
303
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 14546 if (octets.size() != 4)
304 8 return false;
305
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 72682 for (unsigned i = 0; i < 4; ++i) {
306
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 58152 const uint64_t this_octet = String2Uint64(octets[i]);
307
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 58152 if (this_octet > 255)
308 8 return false;
309 }
310
311 14530 return true;
312 24058 }
313
314
315 /**
316 * Basic input validation to ensure that this could syntactically represent a
317 * valid IPv6 address.
318 */
319 336 bool Resolver::IsIpv6Address(const string &address) {
320 // Are there any unexpected characters?
321
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 672 const sanitizer::InputSanitizer sanitizer("09 af AF :");
322
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 672 return sanitizer.IsValid(address);
323 336 }
324
325
326 15317 Resolver::Resolver(const bool ipv4_only,
327 const unsigned retries,
328 15317 const unsigned timeout_ms)
329 15317 : ipv4_only_(ipv4_only)
330 15317 , retries_(retries)
331 15317 , timeout_ms_(timeout_ms)
332 15317 , throttle_(0)
333 15317 , min_ttl_(kDefaultMinTtl)
334 15317 , max_ttl_(kDefaultMaxTtl) {
335 15317 prng_.InitLocaltime();
336 15317 }
337
338
339 /**
340 * Wrapper around the vector interface.
341 */
342 906 Host Resolver::Resolve(const string &name) {
343 906 vector<string> names;
344
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 906 names.push_back(name);
345 906 vector<Host> hosts;
346
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 906 ResolveMany(names, &hosts);
347
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 1812 return hosts[0];
348 906 }
349
350
351 /**
352 * Calls the overwritten concrete resolver, verifies the sanity of the returned
353 * addresses and constructs the Host objects in the same order as the names.
354 */
355 3074 void Resolver::ResolveMany(const vector<string> &names, vector<Host> *hosts) {
356 3074 const unsigned num = names.size();
357
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 3074 if (num == 0)
358 ✗ return;
359
360
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 3074 vector<vector<string> > ipv4_addresses(num);
361
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 3074 vector<vector<string> > ipv6_addresses(num);
362
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 3074 vector<Failures> failures(num);
363
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 3074 vector<unsigned> ttls(num);
364
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 3074 vector<string> fqdns(num);
365
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 3074 vector<bool> skip(num);
366
367 // Deal with special names: empty, IPv4, IPv6
368
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 6350 for (unsigned i = 0; i < num; ++i) {
369
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 3276 if (names[i].empty()) {
370
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 2146 LogCvmfs(kLogDns, kLogDebug, "empty hostname");
371 2146 Host invalid_host;
372
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 2146 invalid_host.name_ = "";
373 2146 invalid_host.status_ = kFailInvalidHost;
374
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 2146 hosts->push_back(invalid_host);
375
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 2146 skip[i] = true;
376
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 3276 } else if (IsIpv4Address(names[i])) {
377
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 466 LogCvmfs(kLogDns, kLogDebug, "IPv4 address %s", names[i].c_str());
378 466 Host ipv4_host;
379
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 466 ipv4_host.name_ = names[i];
380 466 ipv4_host.status_ = kFailOk;
381
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 466 ipv4_host.ipv4_addresses_.insert(names[i]);
382 466 ipv4_host.deadline_ = time(NULL) + max_ttl_;
383
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 466 hosts->push_back(ipv4_host);
384
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 466 skip[i] = true;
385
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 1754 } else if ((names[i].length() >= 3) && (names[i][0] == '[')
386
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 1288 && (names[i][names[i].length() - 1] == ']')) {
387
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 32 LogCvmfs(kLogDns, kLogDebug, "IPv6 address %s", names[i].c_str());
388 32 Host ipv6_host;
389
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 32 ipv6_host.name_ = names[i];
390 32 ipv6_host.status_ = kFailOk;
391
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 32 ipv6_host.ipv6_addresses_.insert(names[i]);
392 32 ipv6_host.deadline_ = time(NULL) + max_ttl_;
393
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 32 hosts->push_back(ipv6_host);
394
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 32 skip[i] = true;
395 32 } else {
396
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 632 hosts->push_back(Host());
397
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 632 skip[i] = false;
398 }
399 }
400
401
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 3074 DoResolve(names, skip, &ipv4_addresses, &ipv6_addresses, &failures, &ttls,
402 &fqdns);
403
404 // Construct host objects
405
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406
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 3276 if (skip[i])
407 2796 continue;
408
409 632 Host host;
410
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 632 host.name_ = fqdns[i];
411 632 host.status_ = failures[i];
412
413 632 unsigned effective_ttl = ttls[i];
414
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 632 if (effective_ttl < min_ttl_) {
415 160 effective_ttl = min_ttl_;
416
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 472 } else if (effective_ttl > max_ttl_) {
417 16 effective_ttl = max_ttl_;
418 }
419 632 host.deadline_ = time(NULL) + effective_ttl;
420
421
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 632 if (host.status_ != kFailOk) {
422
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 304 LogCvmfs(kLogDns, kLogDebug, "failed to resolve %s - %d (%s), ttl %u",
423 152 names[i].c_str(), host.status_, Code2Ascii(host.status_),
424 effective_ttl);
425
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 152 (*hosts)[i] = host;
426 152 continue;
427 }
428
429 // Verify addresses and make them readily available for curl
430
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 1024 for (unsigned j = 0; j < ipv4_addresses[i].size(); ++j) {
431
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 544 if (!IsIpv4Address(ipv4_addresses[i][j])) {
432
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 64 LogCvmfs(kLogDns, kLogDebug | kLogSyslogWarn,
433 "host name %s resolves to invalid IPv4 address %s",
434 64 names[i].c_str(), ipv4_addresses[i][j].c_str());
435 32 continue;
436 }
437
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 512 if (names[i] == host.name_) {
438
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 488 LogCvmfs(kLogDns, kLogDebug, "add address %s -> %s", names[i].c_str(),
439 488 ipv4_addresses[i][j].c_str());
440 } else {
441
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 48 LogCvmfs(kLogDns, kLogDebug, "add address %s -> %s -> %s",
442 24 names[i].c_str(), host.name_.c_str(),
443 24 ipv4_addresses[i][j].c_str());
444 }
445
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 512 host.ipv4_addresses_.insert(ipv4_addresses[i][j]);
446 }
447
448
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 816 for (unsigned j = 0; j < ipv6_addresses[i].size(); ++j) {
449
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 336 if (!IsIpv6Address(ipv6_addresses[i][j])) {
450
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 32 LogCvmfs(kLogDns, kLogDebug | kLogSyslogWarn,
451 "host name %s resolves to invalid IPv6 address %s",
452 32 names[i].c_str(), ipv6_addresses[i][j].c_str());
453 16 continue;
454 }
455 // For URLs we need brackets around IPv6 addresses
456
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 320 if (names[i] == host.name_) {
457
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 312 LogCvmfs(kLogDns, kLogDebug, "add address %s -> %s", names[i].c_str(),
458 312 ipv6_addresses[i][j].c_str());
459 } else {
460
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 16 LogCvmfs(kLogDns, kLogDebug, "add address %s -> %s -> %s",
461 8 names[i].c_str(), host.name_.c_str(),
462 8 ipv6_addresses[i][j].c_str());
463 }
464
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 320 host.ipv6_addresses_.insert("[" + ipv6_addresses[i][j] + "]");
465 }
466
467
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 480 if (host.ipv4_addresses_.empty() && host.ipv6_addresses_.empty()) {
468
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 24 LogCvmfs(kLogDns, kLogDebug, "no addresses returned for %s",
469 24 names[i].c_str());
470 24 host.status_ = kFailNoAddress;
471 }
472
473 // Remove surplus IP addresses
474
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 480 if (throttle_ > 0) {
475
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 24 while (host.ipv4_addresses_.size() > throttle_) {
476 16 const unsigned random = prng_.Next(host.ipv4_addresses_.size());
477 16 set<string>::iterator rnd_itr = host.ipv4_addresses_.begin();
478
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 16 std::advance(rnd_itr, random);
479
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 16 host.ipv4_addresses_.erase(rnd_itr);
480 }
481
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 24 while (host.ipv6_addresses_.size() > throttle_) {
482 16 const unsigned random = prng_.Next(host.ipv6_addresses_.size());
483 16 set<string>::iterator rnd_itr = host.ipv6_addresses_.begin();
484
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 16 std::advance(rnd_itr, random);
485
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 16 host.ipv6_addresses_.erase(rnd_itr);
486 }
487 }
488
489
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 480 (*hosts)[i] = host;
490
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 632 }
491 3074 }
492
493
494 //------------------------------------------------------------------------------
495
496
497 namespace {
498
499 enum ResourceRecord {
500 kRrA = 0,
501 kRrAaaa,
502 };
503
504 /**
505 * Used to transport a name resolving request across the asynchronous c-ares
506 * interface. The QueryInfo objects are used for both IPv4 and IPv6 requests.
507 * The addresses are entered directly via pointers, ttls and fqdns are later
508 * merged into a single response (for IPv4/IPv6).
509 */
510 struct QueryInfo {
511 488 QueryInfo(vector<string> *a, const string &n, const ResourceRecord r)
512 488 : addresses(a)
513 488 , complete(false)
514 488 , fqdn(n)
515
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 488 , name(n)
516 488 , record(r)
517 488 , status(kFailOther)
518 488 , ttl(0) { }
519
520 vector<string> *addresses;
521 bool complete;
522 string fqdn;
523 string name;
524 ResourceRecord record;
525 Failures status;
526 unsigned ttl;
527 };
528
529 } // namespace
530
531
532 static Failures CaresExtractIpv4(const unsigned char *abuf, int alen,
533 vector<string> *addresses, unsigned *ttl,
534 string *fqdn);
535 static Failures CaresExtractIpv6(const unsigned char *abuf, int alen,
536 vector<string> *addresses, unsigned *ttl,
537 string *fqdn);
538
539 /**
540 * Called when a DNS query returns or times out. Sets the return status and the
541 * IP addresses (if successful) in the QueryInfo object.
542 */
543 488 static void CallbackCares(void *arg, int status, int timeouts_ms,
544 unsigned char *abuf, int alen) {
545 488 QueryInfo *info = reinterpret_cast<QueryInfo *>(arg);
546
547 488 info->complete = true;
548
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 488 switch (status) {
549 344 case ARES_SUCCESS:
550 Failures retval;
551
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 344 switch (info->record) {
552 176 case kRrA:
553 176 retval = CaresExtractIpv4(abuf, alen, info->addresses, &info->ttl,
554 &info->fqdn);
555 176 break;
556 168 case kRrAaaa:
557 168 retval = CaresExtractIpv6(abuf, alen, info->addresses, &info->ttl,
558 &info->fqdn);
559 168 break;
560 ✗ default:
561 // Never here.
562 ✗ PANIC(NULL);
563 }
564 344 info->status = retval;
565 344 break;
566 16 case ARES_ENODATA:
567 16 info->status = kFailUnknownHost;
568 16 break;
569 ✗ case ARES_EFORMERR:
570 ✗ info->status = kFailMalformed;
571 ✗ break;
572 96 case ARES_ENOTFOUND:
573 96 info->status = kFailUnknownHost;
574 96 break;
575 16 case ARES_ETIMEOUT:
576 16 info->status = kFailTimeout;
577 16 break;
578 16 case ARES_ECONNREFUSED:
579 16 info->status = kFailInvalidResolvers;
580 16 break;
581 ✗ default:
582 ✗ info->status = kFailOther;
583 }
584 488 }
585
586
587 /**
588 * Extracts IPv4 addresses from an A record return in c-ares. TTLs are
589 * merged to a single one, representing the minimum.
590 */
591 176 static Failures CaresExtractIpv4(const unsigned char *abuf,
592 int alen,
593 vector<string> *addresses,
594 unsigned *ttl,
595 string *fqdn) {
596 176 struct hostent *host_entry = NULL;
597 struct ares_addrttl records[CaresResolver::kMaxAddresses];
598 176 int naddrttls = CaresResolver::kMaxAddresses;
599
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 176 const int retval = ares_parse_a_reply(abuf, alen, &host_entry, records,
600 &naddrttls);
601
602
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 176 switch (retval) {
603 176 case ARES_SUCCESS:
604
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 176 if (host_entry == NULL)
605 ✗ return kFailMalformed;
606
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 176 if (host_entry->h_name == NULL) {
607 ✗ ares_free_hostent(host_entry);
608 ✗ return kFailMalformed;
609 }
610
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 176 *fqdn = string(host_entry->h_name);
611
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 176 ares_free_hostent(host_entry);
612
613
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 176 if (naddrttls <= 0)
614 ✗ return kFailMalformed;
615 176 *ttl = unsigned(-1);
616
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 352 for (unsigned i = 0; i < static_cast<unsigned>(naddrttls); ++i) {
617
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 176 if (records[i].ttl < 0)
618 ✗ continue;
619 176 *ttl = std::min(unsigned(records[i].ttl), *ttl);
620
621 char addrstr[INET_ADDRSTRLEN];
622 176 const void *retval_p = inet_ntop(AF_INET, &(records[i].ipaddr), addrstr,
623 INET_ADDRSTRLEN);
624
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 176 if (!retval_p)
625 ✗ continue;
626
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 176 addresses->push_back(addrstr);
627 }
628
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 176 if (addresses->empty())
629 ✗ return kFailMalformed;
630 176 return kFailOk;
631 ✗ case ARES_EBADRESP:
632 // Fall through
633 case ARES_ENODATA:
634 ✗ return kFailMalformed;
635 ✗ default:
636 ✗ return kFailOther;
637 }
638 }
639
640
641 168 static Failures CaresExtractIpv6(const unsigned char *abuf,
642 int alen,
643 vector<string> *addresses,
644 unsigned *ttl,
645 string *fqdn) {
646 168 struct hostent *host_entry = NULL;
647 struct ares_addr6ttl records[CaresResolver::kMaxAddresses];
648 168 int naddrttls = CaresResolver::kMaxAddresses;
649
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 168 const int retval = ares_parse_aaaa_reply(abuf, alen, &host_entry, records,
650 &naddrttls);
651
652
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 168 switch (retval) {
653 168 case ARES_SUCCESS:
654
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 168 if (host_entry == NULL)
655 ✗ return kFailMalformed;
656
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 168 if (host_entry->h_name == NULL) {
657 ✗ ares_free_hostent(host_entry);
658 ✗ return kFailMalformed;
659 }
660
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 168 *fqdn = string(host_entry->h_name);
661
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 168 ares_free_hostent(host_entry);
662
663
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 168 if (naddrttls <= 0)
664 ✗ return kFailMalformed;
665 168 *ttl = unsigned(-1);
666
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 336 for (unsigned i = 0; i < static_cast<unsigned>(naddrttls); ++i) {
667
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 168 if (records[i].ttl < 0)
668 ✗ continue;
669 168 *ttl = std::min(unsigned(records[i].ttl), *ttl);
670
671 char addrstr[INET6_ADDRSTRLEN];
672 168 const void *retval_p = inet_ntop(AF_INET6, &(records[i].ip6addr),
673 addrstr, INET6_ADDRSTRLEN);
674
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 168 if (!retval_p)
675 ✗ continue;
676
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 168 addresses->push_back(addrstr);
677 }
678
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 168 if (addresses->empty())
679 ✗ return kFailMalformed;
680 168 return kFailOk;
681 ✗ case ARES_EBADRESP:
682 // Fall through
683 case ARES_ENODATA:
684 ✗ return kFailMalformed;
685 ✗ default:
686 ✗ return kFailOther;
687 }
688 }
689
690
691 5779 CaresResolver::CaresResolver(const bool ipv4_only,
692 const unsigned retries,
693 5779 const unsigned timeout_ms)
694 : Resolver(ipv4_only, retries, timeout_ms)
695 5779 , channel_(NULL)
696 5779 , lookup_options_(strdup("b")) { }
697
698
699 21136 CaresResolver::~CaresResolver() {
700
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 10568 if (channel_) {
701 10568 ares_destroy(*channel_);
702 10568 free(channel_);
703 }
704 10568 free(lookup_options_);
705 21136 }
706
707
708 /**
709 * Returns a CaresResolver readily initialized, or NULL if an error occurs.
710 */
711 5779 CaresResolver *CaresResolver::Create(const bool ipv4_only,
712 const unsigned retries,
713 const unsigned timeout_ms) {
714 int retval;
715
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 5779 if (getenv("HOSTALIASES") == NULL) {
716 47 retval = setenv("HOSTALIASES", "/etc/hosts", 1);
717
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 47 assert(retval == 0);
718 }
719
720
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 5779 CaresResolver *resolver = new CaresResolver(ipv4_only, retries, timeout_ms);
721 5779 resolver->channel_ = reinterpret_cast<ares_channel *>(
722 5779 smalloc(sizeof(ares_channel)));
723 5779 memset(resolver->channel_, 0, sizeof(ares_channel));
724
725 struct ares_addr_node *addresses;
726 struct ares_addr_node *iter;
727 struct ares_options options;
728 int optmask;
729 5779 memset(&options, 0, sizeof(options));
730 5779 options.timeout = timeout_ms;
731 5779 options.tries = 1 + retries;
732 5779 options.lookups = resolver->lookup_options_;
733 5779 optmask = ARES_OPT_TIMEOUTMS | ARES_OPT_TRIES | ARES_OPT_LOOKUPS;
734
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 5779 retval = ares_init_options(resolver->channel_, &options, optmask);
735
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 5779 if (retval != ARES_SUCCESS)
736 ✗ goto create_fail;
737
738 // Save search domains
739
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 5779 retval = ares_save_options(*resolver->channel_, &options, &optmask);
740
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 5779 if (retval != ARES_SUCCESS)
741 ✗ goto create_fail;
742
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 5779 for (int i = 0; i < options.ndomains; ++i) {
743 ✗ resolver->domains_.push_back(options.domains[i]);
744 }
745
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 5779 ares_destroy_options(&options);
746
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 5779 resolver->system_domains_ = resolver->domains_;
747
748 // Save the system default resolvers
749 5779 addresses = NULL;
750
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 5779 retval = ares_get_servers(*resolver->channel_, &addresses);
751
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 5779 if (retval != ARES_SUCCESS)
752 ✗ goto create_fail;
753 5779 iter = addresses;
754
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 34674 while (iter) {
755
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 28895 switch (iter->family) {
756 17337 case AF_INET: {
757 char addrstr[INET_ADDRSTRLEN];
758 17337 const void *retval_p = inet_ntop(AF_INET, &(iter->addr), addrstr,
759 INET_ADDRSTRLEN);
760
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 17337 if (!retval_p) {
761 ✗ LogCvmfs(kLogDns, kLogDebug | kLogSyslogErr,
762 "invalid system name resolver");
763 } else {
764
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 17337 resolver->resolvers_.push_back(string(addrstr) + ":53");
765 }
766 17337 break;
767 }
768 11558 case AF_INET6: {
769 char addrstr[INET6_ADDRSTRLEN];
770 11558 const void *retval_p = inet_ntop(AF_INET6, &(iter->addr), addrstr,
771 INET6_ADDRSTRLEN);
772
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 11558 if (!retval_p) {
773 ✗ LogCvmfs(kLogDns, kLogDebug | kLogSyslogErr,
774 "invalid system name resolver");
775 } else {
776
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 11558 resolver->resolvers_.push_back("[" + string(addrstr) + "]:53");
777 }
778 11558 break;
779 }
780 ✗ default:
781 // Never here.
782 ✗ PANIC(NULL);
783 }
784 28895 iter = iter->next;
785 }
786
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 5779 ares_free_data(addresses);
787
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 5779 resolver->system_resolvers_ = resolver->resolvers_;
788
789 5779 return resolver;
790
791 ✗ create_fail:
792 ✗ LogCvmfs(kLogDns, kLogDebug | kLogSyslogErr,
793 "failed to initialize c-ares resolver (%d - %s)", retval,
794 ares_strerror(retval));
795 ✗ free(resolver->channel_);
796 ✗ resolver->channel_ = NULL;
797 ✗ delete resolver;
798 ✗ return NULL;
799 }
800
801
802 /**
803 * Pushes all the DNS queries into the c-ares channel and waits for the results
804 * on the file descriptors.
805 */
806 2698 void CaresResolver::DoResolve(const vector<string> &names,
807 const vector<bool> &skip,
808 vector<vector<string> > *ipv4_addresses,
809 vector<vector<string> > *ipv6_addresses,
810 vector<Failures> *failures,
811 vector<unsigned> *ttls,
812 vector<string> *fqdns) {
813 2698 const unsigned num = names.size();
814
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 2698 if (num == 0)
815 ✗ return;
816
817
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 2698 vector<QueryInfo *> infos_ipv4(num, NULL);
818
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 2698 vector<QueryInfo *> infos_ipv6(num, NULL);
819
820
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 5550 for (unsigned i = 0; i < num; ++i) {
821
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 2852 if (skip[i])
822 2604 continue;
823
824
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 248 if (!ipv4_only()) {
825
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 240 infos_ipv6[i] = new QueryInfo(&(*ipv6_addresses)[i], names[i], kRrAaaa);
826
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 240 ares_search(*channel_, names[i].c_str(), ns_c_in, ns_t_aaaa,
827 240 CallbackCares, infos_ipv6[i]);
828 }
829
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 248 infos_ipv4[i] = new QueryInfo(&(*ipv4_addresses)[i], names[i], kRrA);
830
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 248 ares_search(*channel_, names[i].c_str(), ns_c_in, ns_t_a, CallbackCares,
831 248 infos_ipv4[i]);
832 }
833
834 bool all_complete;
835 do {
836 20695914 all_complete = true;
837
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 20695914 WaitOnCares();
838
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 20699086 for (unsigned i = 0; i < num; ++i) {
839
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 41390156 if ((infos_ipv4[i] && !infos_ipv4[i]->complete)
840
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 41390156 || (infos_ipv6[i] && !infos_ipv6[i]->complete)) {
841 20693216 all_complete = false;
842 20693216 break;
843 }
844 }
845
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 20695914 } while (!all_complete);
846
847 // Silently ignore errors with IPv4/6 if there are at least some usable IP
848 // addresses.
849
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 5550 for (unsigned i = 0; i < num; ++i) {
850
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 2852 if (skip[i])
851 2604 continue;
852
853 248 Failures status = kFailOther;
854 248 (*ttls)[i] = unsigned(-1);
855
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 248 (*fqdns)[i] = "";
856
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 248 if (infos_ipv6[i]) {
857 240 status = infos_ipv6[i]->status;
858
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 240 if (status == kFailOk) {
859 168 (*ttls)[i] = std::min(infos_ipv6[i]->ttl, (*ttls)[i]);
860
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 168 (*fqdns)[i] = infos_ipv6[i]->fqdn;
861 }
862 }
863
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 248 if (infos_ipv4[i]) {
864 248 (*ttls)[i] = std::min(infos_ipv4[i]->ttl, (*ttls)[i]);
865
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 248 if ((*fqdns)[i] == "")
866
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 80 (*fqdns)[i] = infos_ipv4[i]->fqdn;
867
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 248 if (status != kFailOk)
868 80 status = infos_ipv4[i]->status;
869 }
870 248 (*failures)[i] = status;
871 }
872
873
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 5550 for (unsigned i = 0; i < num; ++i) {
874
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 2852 delete infos_ipv4[i];
875
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 2852 delete infos_ipv6[i];
876 }
877 2698 }
878
879
880 24 bool CaresResolver::SetResolvers(const vector<string> &resolvers) {
881
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 48 const string address_list = JoinStrings(resolvers, ",");
882
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 24 const int retval = ares_set_servers_csv(*channel_, address_list.c_str());
883
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 24 if (retval != ARES_SUCCESS)
884 ✗ return false;
885
886
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 24 resolvers_ = resolvers;
887 24 return true;
888 24 }
889
890
891 /**
892 * Changes the options of the active channel. This is hacky and deals with
893 * c-ares internal data structures because there is no way to do it via public
894 * APIs.
895 */
896 16 bool CaresResolver::SetSearchDomains(const vector<string> &domains) {
897 // From ares_private.h
898 struct {
899 int flags;
900 int timeout;
901 int tries;
902 int ndots;
903 int rotate;
904 int udp_port;
905 int tcp_port;
906 int socket_send_buffer_size;
907 int socket_receive_buffer_size;
908 char **domains;
909 int ndomains;
910 // More fields come in the original data structure
911 } ares_channelhead;
912
913 16 memcpy(&ares_channelhead, *channel_, sizeof(ares_channelhead));
914
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 16 if (ares_channelhead.domains) {
915
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 24 for (int i = 0; i < ares_channelhead.ndomains; ++i) {
916 16 free(ares_channelhead.domains[i]);
917 }
918 8 free(ares_channelhead.domains);
919 8 ares_channelhead.domains = NULL;
920 }
921
922 16 ares_channelhead.ndomains = static_cast<int>(domains.size());
923
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 16 if (ares_channelhead.ndomains > 0) {
924 8 ares_channelhead.domains = reinterpret_cast<char **>(
925 8 smalloc(ares_channelhead.ndomains * sizeof(char *)));
926
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✓ Branch 1 taken 8 times.
 24 for (int i = 0; i < ares_channelhead.ndomains; ++i) {
927 16 ares_channelhead.domains[i] = strdup(domains[i].c_str());
928 }
929 }
930
931 16 memcpy(*channel_, &ares_channelhead, sizeof(ares_channelhead));
932
933
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 16 domains_ = domains;
934 16 return true;
935 }
936
937
938 ✗ void CaresResolver::SetSystemResolvers() {
939 ✗ const int retval = SetResolvers(system_resolvers_);
940 ✗ assert(retval == true);
941 }
942
943
944 ✗ void CaresResolver::SetSystemSearchDomains() {
945 ✗ const int retval = SetSearchDomains(system_domains_);
946 ✗ assert(retval == true);
947 }
948
949
950 /**
951 * Polls on c-ares sockets and triggers call-backs execution. Might be
952 * necessary to call this repeatadly.
953 */
954 20695914 void CaresResolver::WaitOnCares() {
955 // Adapted from libcurl
956 ares_socket_t socks[ARES_GETSOCK_MAXNUM];
957 struct pollfd pfd[ARES_GETSOCK_MAXNUM];
958
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 20695914 const int bitmask = ares_getsock(*channel_, socks, ARES_GETSOCK_MAXNUM);
959 20695914 unsigned num = 0;
960
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 60785202 for (unsigned i = 0; i < ARES_GETSOCK_MAXNUM; ++i) {
961 60785202 pfd[i].events = 0;
962 60785202 pfd[i].revents = 0;
963
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 60785202 if (ARES_GETSOCK_READABLE(bitmask, i)) {
964 40089288 pfd[i].fd = socks[i];
965 40089288 pfd[i].events |= POLLRDNORM | POLLIN;
966 }
967
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 60785202 if (ARES_GETSOCK_WRITABLE(bitmask, i)) {
968 ✗ pfd[i].fd = socks[i];
969 ✗ pfd[i].events |= POLLWRNORM | POLLOUT;
970 }
971
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 60785202 if (pfd[i].events != 0)
972 40089288 num++;
973 else
974 20695914 break;
975 }
976
977 20695914 int nfds = 0;
978
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 20695914 if (num > 0) {
979 do {
980
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 20693296 nfds = poll(pfd, num, timeout_ms());
981
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 20693296 if (nfds == -1) {
982 // poll must not fail for other reasons
983 ✗ if ((errno != EAGAIN) && (errno != EINTR))
984 ✗ PANIC(NULL);
985 }
986
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 20693296 } while (nfds == -1);
987 }
988
989
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 20695914 if (nfds == 0) {
990 // Call ares_process() unconditionally here, even if we simply timed out
991 // above, as otherwise the ares name resolve won't timeout.
992
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 2618 ares_process_fd(*channel_, ARES_SOCKET_BAD, ARES_SOCKET_BAD);
993 } else {
994 // Go through the descriptors and ask for executing the callbacks.
995
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 60782584 for (unsigned i = 0; i < num; ++i) {
996 80178576 ares_process_fd(
997
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 40089288 *channel_,
998
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 40089288 pfd[i].revents & (POLLRDNORM | POLLIN) ? pfd[i].fd : ARES_SOCKET_BAD,
999
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 40089288 pfd[i].revents & (POLLWRNORM | POLLOUT) ? pfd[i].fd
1000 : ARES_SOCKET_BAD);
1001 }
1002 }
1003 20695914 }
1004
1005
1006 //------------------------------------------------------------------------------
1007
1008
1009 /**
1010 * Opens a file descriptor to the host file that stays open until destruction.
1011 * If no path is given, the HOST_ALIASES environment variable is evaluated
1012 * followed by /etc/hosts.
1013 */
1014 4949 HostfileResolver *HostfileResolver::Create(const string &path, bool ipv4_only) {
1015
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 4949 HostfileResolver *resolver = new HostfileResolver(ipv4_only);
1016
1017
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 4949 string hosts_file = path;
1018
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 4949 if (hosts_file == "") {
1019 4581 char *hosts_env = getenv("HOST_ALIASES");
1020
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 4581 if (hosts_env != NULL) {
1021
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 16 hosts_file = string(hosts_env);
1022 } else {
1023
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 4565 hosts_file = "/etc/hosts";
1024 }
1025 }
1026
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 4949 resolver->fhosts_ = fopen(hosts_file.c_str(), "r");
1027
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 4949 if (!resolver->fhosts_) {
1028
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 16 LogCvmfs(kLogDns, kLogDebug | kLogSyslogWarn, "failed to read host file %s",
1029 hosts_file.c_str());
1030
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 16 delete resolver;
1031 16 return NULL;
1032 }
1033 4933 return resolver;
1034 4949 }
1035
1036
1037 /**
1038 * Used to process longer domain names before shorter ones, in order to get
1039 * the correct fully qualified domain name. Reversed return value in order to
1040 * sort in descending order.
1041 */
1042 24 static bool SortNameLength(const string &a, const string &b) {
1043 24 const unsigned len_a = a.length();
1044 24 const unsigned len_b = b.length();
1045
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 24 if (len_a != len_b)
1046 24 return len_a > len_b;
1047 ✗ return a > b;
1048 }
1049
1050
1051 /**
1052 * Creates a fresh reverse lookup map
1053 */
1054 2408 void HostfileResolver::DoResolve(const vector<string> &names,
1055 const vector<bool> &skip,
1056 vector<vector<std::string> > *ipv4_addresses,
1057 vector<vector<std::string> > *ipv6_addresses,
1058 vector<Failures> *failures,
1059 vector<unsigned> *ttls,
1060 vector<string> *fqdns) {
1061 2408 const unsigned num = names.size();
1062
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 2408 if (num == 0)
1063 ✗ return;
1064
1065 2408 ParseHostFile();
1066
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 4866 for (unsigned i = 0; i < num; ++i) {
1067
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 2458 if (skip[i])
1068 2178 continue;
1069
1070 280 vector<string> effective_names;
1071
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 280 if (!names[i].empty() && (names[i][names[i].length() - 1] == '.')) {
1072
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 16 effective_names.push_back(names[i].substr(0, names[i].length() - 1));
1073 } else {
1074
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 264 effective_names.push_back(names[i]);
1075
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 288 for (unsigned j = 0; j < domains().size(); ++j) {
1076
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 24 effective_names.push_back(names[i] + "." + domains()[j]);
1077 }
1078 }
1079
1080 // Use the longest matching name as fqdn
1081
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 280 std::sort(effective_names.begin(), effective_names.end(), SortNameLength);
1082
1083 280 (*failures)[i] = kFailUnknownHost;
1084
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 280 (*fqdns)[i] = names[i];
1085
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 360 for (unsigned j = 0; j < effective_names.size(); ++j) {
1086
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 280 const map<string, HostEntry>::iterator iter = host_map_.find(
1087 280 effective_names[j]);
1088
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 280 if (iter != host_map_.end()) {
1089
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 600 (*ipv4_addresses)[i].insert((*ipv4_addresses)[i].end(),
1090 200 iter->second.ipv4_addresses.begin(),
1091 200 iter->second.ipv4_addresses.end());
1092
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 600 (*ipv6_addresses)[i].insert((*ipv6_addresses)[i].end(),
1093 200 iter->second.ipv6_addresses.begin(),
1094 200 iter->second.ipv6_addresses.end());
1095 200 (*ttls)[i] = min_ttl_;
1096
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 200 (*fqdns)[i] = effective_names[j];
1097 200 (*failures)[i] = kFailOk;
1098 200 break;
1099 } // Host name found
1100 } // All possible names (search domains added)
1101 280 }
1102 }
1103
1104
1105 4949 HostfileResolver::HostfileResolver(const bool ipv4_only)
1106 4949 : Resolver(ipv4_only, 0, 0), fhosts_(NULL) { }
1107
1108
1109 19792 HostfileResolver::~HostfileResolver() {
1110
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 9896 if (fhosts_)
1111 9864 fclose(fhosts_);
1112 19792 }
1113
1114
1115 /**
1116 * TODO: this should be only necessary when the modification timestamp changed.
1117 */
1118 2408 void HostfileResolver::ParseHostFile() {
1119
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 2408 assert(fhosts_);
1120
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 2408 rewind(fhosts_);
1121 2408 host_map_.clear();
1122
1123 2408 string line;
1124
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 9600 while (GetLineFile(fhosts_, &line)) {
1125 char address[kIpMaxLength + 1];
1126 char hostname[kHostnameMaxLength + 1];
1127 int bytes_read;
1128 7192 size_t str_offset = 0;
1129
1130 // strip comments
1131 7192 const size_t hash_pos = line.find_first_of('#');
1132
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 7192 if (hash_pos != string::npos)
1133
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 80 line = line.substr(0, hash_pos);
1134
1135 // First token is an IP address
1136 7192 int ip_start_pos = -1, ip_end_pos = -1, scan_result;
1137 7192 scan_result = sscanf(line.c_str(), " %n%*s%n", &ip_start_pos, &ip_end_pos);
1138
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 7192 if (scan_result == EOF)
1139 128 continue;
1140
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 7080 assert(ip_start_pos != -1);
1141
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 7080 assert(ip_end_pos != -1);
1142
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 7080 if (ip_start_pos == ip_end_pos)
1143 ✗ continue;
1144
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 7080 if (ip_end_pos - ip_start_pos > kIpMaxLength) {
1145
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 16 LogCvmfs(
1146 kLogDns, kLogSyslogWarn,
1147 "Skipping line in hosts file due to invalid IP address format: %s",
1148 line.c_str());
1149 16 continue;
1150 }
1151
1152 7064 bytes_read = -1;
1153 7064 scan_result = sscanf(line.c_str(), " %s%n", address, &bytes_read);
1154
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 7064 assert(scan_result == 1);
1155
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 7064 assert(bytes_read != -1);
1156 7064 str_offset += bytes_read;
1157
1158 // Next tokens are hostnames and aliases (we treat them as equal)
1159
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✓ Branch 2 taken 7008 times.
 29464 while (str_offset < line.length()) {
1160 // check hostname length
1161 22456 int hostname_start_pos = -1, hostname_end_pos = -1;
1162 22456 scan_result = sscanf(line.c_str() + str_offset, " %n%*s%n",
1163 &hostname_start_pos, &hostname_end_pos);
1164
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 22456 if (scan_result == EOF)
1165 56 break;
1166
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 22400 assert(hostname_start_pos != -1);
1167
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 22400 assert(hostname_end_pos != -1);
1168
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 22400 if (hostname_start_pos == hostname_end_pos)
1169 ✗ break;
1170
1171
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 22400 if (hostname_end_pos - hostname_start_pos > kHostnameMaxLength) {
1172
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 16 LogCvmfs(
1173 kLogDns, kLogSyslogWarn,
1174 "Skipping invalid (too long) hostname in hosts file on line: %s",
1175 line.c_str());
1176 16 str_offset += hostname_end_pos;
1177 16 continue;
1178 }
1179
1180 22384 bytes_read = -1;
1181 22384 scan_result = sscanf(line.c_str() + str_offset, " %s%n", hostname,
1182 &bytes_read);
1183
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 22384 assert(scan_result == 1);
1184
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 22384 assert(bytes_read != -1);
1185 22384 str_offset += bytes_read;
1186
1187
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 22384 if (hostname[strlen(hostname) - 1] == '.')
1188 ✗ hostname[strlen(hostname) - 1] = 0; // strip the last character
1189
1190
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 22384 const map<string, HostEntry>::iterator iter = host_map_.find(hostname);
1191
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 22384 if (iter == host_map_.end()) {
1192 17944 HostEntry entry;
1193
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 17944 if (IsIpv4Address(address))
1194
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 13528 entry.ipv4_addresses.push_back(address);
1195
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 4416 else if (!ipv4_only())
1196
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 4400 entry.ipv6_addresses.push_back(address);
1197
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 17944 host_map_[hostname] = entry;
1198 17944 } else {
1199
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 4440 if (IsIpv4Address(address))
1200
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 24 iter->second.ipv4_addresses.push_back(address);
1201
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 4416 else if (!ipv4_only())
1202
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 4400 iter->second.ipv6_addresses.push_back(address);
1203 }
1204 } // Current line
1205 } // Hosts file
1206 2408 }
1207
1208
1209 4557 bool HostfileResolver::SetSearchDomains(const vector<string> &domains) {
1210 4557 domains_ = domains;
1211 4557 return true;
1212 }
1213
1214
1215 ✗ void HostfileResolver::SetSystemSearchDomains() {
1216 // TODO(jblomer)
1217 ✗ PANIC(NULL);
1218 }
1219
1220
1221 //------------------------------------------------------------------------------
1222
1223
1224 /**
1225 * Creates hostfile and c-ares resolvers and uses c-ares resolvers search
1226 * domains for the hostfile resolver.
1227 */
1228 4557 NormalResolver *NormalResolver::Create(const bool ipv4_only,
1229 const unsigned retries,
1230 const unsigned timeout_ms) {
1231 4557 CaresResolver *cares_resolver = CaresResolver::Create(ipv4_only, retries,
1232 timeout_ms);
1233
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 4557 if (!cares_resolver)
1234 ✗ return NULL;
1235
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 4557 HostfileResolver *hostfile_resolver = HostfileResolver::Create("", ipv4_only);
1236
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 4557 if (!hostfile_resolver) {
1237
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 8 delete cares_resolver;
1238 8 return NULL;
1239 }
1240 4549 const bool retval = hostfile_resolver->SetSearchDomains(
1241 cares_resolver->domains());
1242
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 4549 assert(retval);
1243
1244 4549 NormalResolver *normal_resolver = new NormalResolver();
1245 4549 normal_resolver->cares_resolver_ = cares_resolver;
1246 4549 normal_resolver->hostfile_resolver_ = hostfile_resolver;
1247 4549 normal_resolver->domains_ = cares_resolver->domains();
1248 4549 normal_resolver->resolvers_ = cares_resolver->resolvers();
1249 4549 normal_resolver->retries_ = cares_resolver->retries();
1250 4549 normal_resolver->timeout_ms_ = cares_resolver->timeout_ms();
1251 4549 return normal_resolver;
1252 }
1253
1254
1255 /**
1256 * Makes only sense for the c-ares resolver.
1257 */
1258 8 bool NormalResolver::SetResolvers(const vector<string> &resolvers) {
1259 8 return cares_resolver_->SetResolvers(resolvers);
1260 }
1261
1262
1263 /**
1264 * Set new search domains for both resolvers or for none.
1265 */
1266 ✗ bool NormalResolver::SetSearchDomains(const vector<string> &domains) {
1267 ✗ const vector<string> old_domains = hostfile_resolver_->domains();
1268 ✗ bool retval = hostfile_resolver_->SetSearchDomains(domains);
1269 ✗ if (!retval)
1270 ✗ return false;
1271 ✗ retval = cares_resolver_->SetSearchDomains(domains);
1272 ✗ if (!retval) {
1273 ✗ retval = hostfile_resolver_->SetSearchDomains(old_domains);
1274 ✗ assert(retval);
1275 ✗ return false;
1276 }
1277 ✗ return true;
1278 }
1279
1280
1281 ✗ void NormalResolver::SetSystemResolvers() {
1282 ✗ cares_resolver_->SetSystemResolvers();
1283 }
1284
1285
1286 ✗ void NormalResolver::SetSystemSearchDomains() {
1287 ✗ cares_resolver_->SetSystemSearchDomains();
1288 ✗ const bool retval = hostfile_resolver_->SetSearchDomains(
1289 ✗ cares_resolver_->domains());
1290 ✗ assert(retval);
1291 }
1292
1293
1294 /**
1295 * First pass done by the hostfile resolver, all successfully resolved names
1296 * are skipped by the c-ares resolver.
1297 */
1298 2168 void NormalResolver::DoResolve(const vector<string> &names,
1299 const vector<bool> &skip,
1300 vector<vector<string> > *ipv4_addresses,
1301 vector<vector<string> > *ipv6_addresses,
1302 vector<Failures> *failures,
1303 vector<unsigned> *ttls,
1304 vector<string> *fqdns) {
1305 2168 const unsigned num = names.size();
1306
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 2168 hostfile_resolver_->DoResolve(names, skip, ipv4_addresses, ipv6_addresses,
1307 failures, ttls, fqdns);
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 2168 vector<bool> skip_cares = skip;
1309
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 4338 for (unsigned i = 0; i < num; ++i) {
1310
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 2170 if ((*failures)[i] == kFailOk)
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 2162 skip_cares[i] = true;
1312 }
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 2168 cares_resolver_->DoResolve(names, skip_cares, ipv4_addresses, ipv6_addresses,
1314 failures, ttls, fqdns);
1315 2168 }
1316
1317
1318 4549 NormalResolver::NormalResolver()
1319 4549 : Resolver(false, 0, 0), cares_resolver_(NULL), hostfile_resolver_(NULL) { }
1320
1321
1322 18192 NormalResolver::~NormalResolver() {
1323
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 9096 delete cares_resolver_;
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 9096 delete hostfile_resolver_;
1325 18192 }
1326
1327 } // namespace dns
1328