GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/network/dns.cc
Date: 2026-05-03 02:36:16
Exec Total Coverage
Lines: 617 698 88.4%
Branches: 515 806 63.9%
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 3984 static void PinpointHostSubstr(const std::string &url,
54 unsigned *pos_begin,
55 unsigned *pos_end) {
56 3984 *pos_begin = *pos_end = 0;
57 3984 const unsigned len = url.size();
58 3984 unsigned i = 0;
59
60 // Search '//' in the url string and jump behind
61
2/2
✓ Branch 0 taken 24408 times.
✓ Branch 1 taken 2390 times.
 26798 for (; i < len; ++i) {
62
8/8
✓ Branch 1 taken 1776 times.
✓ Branch 2 taken 22632 times.
✓ Branch 3 taken 1636 times.
✓ Branch 4 taken 140 times.
✓ Branch 6 taken 1594 times.
✓ Branch 7 taken 42 times.
✓ Branch 8 taken 1594 times.
✓ Branch 9 taken 22814 times.
 24408 if ((url[i] == '/') && (i < len - 2) && (url[i + 1] == '/')) {
63 1594 i += 2;
64 1594 *pos_begin = i;
65 1594 break;
66 }
67 }
68
69 // Search '@' within the hostname part and jump behind if present
70
2/2
✓ Branch 0 taken 1594 times.
✓ Branch 1 taken 2390 times.
 3984 if (*pos_begin > 0) {
71
2/2
✓ Branch 0 taken 16338 times.
✓ Branch 1 taken 1202 times.
 17540 for (i = *pos_begin; i < len; ++i) {
72
2/2
✓ Branch 1 taken 322 times.
✓ Branch 2 taken 16016 times.
 16338 if (url[i] == '/') {
73 322 break;
74
2/2
✓ Branch 1 taken 70 times.
✓ Branch 2 taken 15946 times.
 16016 } else if (url[i] == '@') {
75 70 *pos_begin = ++i;
76 70 break;
77 }
78 }
79 }
80
81 // Find the end of the hostname part
82
2/2
✓ Branch 0 taken 1594 times.
✓ Branch 1 taken 2390 times.
 3984 if (*pos_begin > 0) {
83 1594 bool in_ipv6 = (url[*pos_begin] == '[');
84
2/2
✓ Branch 0 taken 12580 times.
✓ Branch 1 taken 266 times.
 12846 for (i = *pos_begin; i < len; ++i) {
85
2/2
✓ Branch 0 taken 1540 times.
✓ Branch 1 taken 11040 times.
 12580 if (in_ipv6) {
86
2/2
✓ Branch 1 taken 1246 times.
✓ Branch 2 taken 294 times.
 1540 if (url[i] != ']')
87 1246 continue;
88 294 in_ipv6 = false;
89 }
90
91
6/6
✓ Branch 1 taken 10202 times.
✓ Branch 2 taken 1132 times.
✓ Branch 4 taken 196 times.
✓ Branch 5 taken 10006 times.
✓ Branch 6 taken 1328 times.
✓ Branch 7 taken 10006 times.
 11334 if ((url[i] == ':') || (url[i] == '/'))
92 1328 break;
93 }
94
2/2
✓ Branch 0 taken 1510 times.
✓ Branch 1 taken 84 times.
 1594 if (!in_ipv6)
95 1510 *pos_end = i - 1;
96
97
2/2
✓ Branch 0 taken 252 times.
✓ Branch 1 taken 1342 times.
 1594 if (*pos_end < *pos_begin)
98 252 *pos_end = *pos_begin = 0;
99 }
100 3984 }
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 2746 std::string ExtractHost(const std::string &url) {
109 unsigned pos_begin;
110 unsigned pos_end;
111 2746 PinpointHostSubstr(url, &pos_begin, &pos_end);
112
2/2
✓ Branch 0 taken 2194 times.
✓ Branch 1 taken 552 times.
 2746 if (pos_begin == 0)
113
1/2
✓ Branch 2 taken 2194 times.
✗ Branch 3 not taken.
 2194 return "";
114
1/2
✓ Branch 1 taken 552 times.
✗ Branch 2 not taken.
 552 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 */
123 822 std::string ExtractPort(const std::string &url) {
124 unsigned pos_begin;
125 unsigned pos_end;
126 822 PinpointHostSubstr(url, &pos_begin, &pos_end);
127
9/10
✓ Branch 0 taken 528 times.
✓ Branch 1 taken 294 times.
✓ Branch 3 taken 430 times.
✓ Branch 4 taken 98 times.
✓ Branch 6 taken 430 times.
✗ Branch 7 not taken.
✓ Branch 8 taken 42 times.
✓ Branch 9 taken 388 times.
✓ Branch 10 taken 434 times.
✓ Branch 11 taken 388 times.
 822 if (pos_begin == 0 || pos_end + 2 >= url.size() || url.at(pos_end + 1) != ':')
128
1/2
✓ Branch 2 taken 434 times.
✗ Branch 3 not taken.
 434 return "";
129
130 // Do not include path
131 388 const std::size_t pos_port = url.find("/", pos_end);
132 388 std::string retme;
133
2/2
✓ Branch 0 taken 304 times.
✓ Branch 1 taken 84 times.
 388 if (pos_port == std::string::npos)
134
1/2
✓ Branch 1 taken 304 times.
✗ Branch 2 not taken.
 304 retme = url.substr(pos_end + 2);
135 else
136
1/2
✓ Branch 1 taken 84 times.
✗ Branch 2 not taken.
 84 retme = url.substr(pos_end + 2, pos_port - pos_end - 2);
137
138 // Port is an integer
139
2/2
✓ Branch 4 taken 978 times.
✓ Branch 5 taken 332 times.
 1310 for (std::string::iterator it = retme.begin(); it != retme.end(); ++it)
140
2/2
✓ Branch 1 taken 56 times.
✓ Branch 2 taken 922 times.
 978 if (isdigit(*it) == 0)
141
1/2
✓ Branch 2 taken 56 times.
✗ Branch 3 not taken.
 56 return "";
142
143 332 return retme;
144 388 }
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 */
152 416 string RewriteUrl(const string &url, const string &ip) {
153 unsigned pos_begin;
154 unsigned pos_end;
155 416 PinpointHostSubstr(url, &pos_begin, &pos_end);
156
2/2
✓ Branch 0 taken 154 times.
✓ Branch 1 taken 262 times.
 416 if (pos_begin == 0)
157
1/2
✓ Branch 1 taken 154 times.
✗ Branch 2 not taken.
 154 return url;
158
159
1/2
✓ Branch 1 taken 262 times.
✗ Branch 2 not taken.
 262 string result = url;
160
1/2
✓ Branch 1 taken 262 times.
✗ Branch 2 not taken.
 262 result.replace(pos_begin, (pos_end - pos_begin) + 1, ip);
161 262 return result;
162 262 }
163
164
165 /**
166 * Removes the brackets from IPv6 addresses. Leaves IPv4 addresses unchanged.
167 */
168 112 string StripIp(const string &decorated_ip) {
169
2/2
✓ Branch 1 taken 98 times.
✓ Branch 2 taken 14 times.
 112 if (!decorated_ip.empty()) {
170 98 if ((decorated_ip[0] == '[')
171
6/6
✓ Branch 0 taken 56 times.
✓ Branch 1 taken 42 times.
✓ Branch 4 taken 28 times.
✓ Branch 5 taken 28 times.
✓ Branch 6 taken 28 times.
✓ Branch 7 taken 70 times.
 98 && (decorated_ip[decorated_ip.length() - 1] == ']')) {
172 28 return decorated_ip.substr(1, decorated_ip.length() - 2);
173 }
174 }
175 84 return decorated_ip;
176 }
177
178
179 /**
180 * Adds http:// if it is missing from proxy
181 */
182 4562 std::string AddDefaultScheme(const std::string &proxy) {
183 4562 const bool ignore_case = true;
184
4/12
✓ Branch 1 taken 4562 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
✓ Branch 4 taken 4562 times.
✗ Branch 5 not taken.
✗ Branch 6 not taken.
✓ Branch 7 taken 4520 times.
✓ Branch 8 taken 42 times.
✗ Branch 9 not taken.
✗ Branch 10 not taken.
✗ Branch 12 not taken.
✗ Branch 13 not taken.
 9124 if (HasPrefix(proxy, "http://", ignore_case)
185
9/19
✓ Branch 2 taken 4276 times.
✗ Branch 3 not taken.
✗ Branch 4 not taken.
✓ Branch 5 taken 4276 times.
✗ Branch 6 not taken.
✓ Branch 7 taken 4262 times.
✓ Branch 8 taken 14 times.
✗ Branch 9 not taken.
✓ Branch 10 taken 56 times.
✓ Branch 11 taken 4206 times.
✗ Branch 12 not taken.
✓ Branch 13 taken 4276 times.
✓ Branch 14 taken 286 times.
✓ Branch 16 taken 4562 times.
✗ Branch 17 not taken.
✗ Branch 18 not taken.
✗ Branch 19 not taken.
✗ Branch 21 not taken.
✗ Branch 22 not taken.
 8838 || HasPrefix(proxy, "https://", ignore_case) || (proxy == "DIRECT")
186
7/9
✓ Branch 2 taken 4562 times.
✗ Branch 3 not taken.
✓ Branch 4 taken 4276 times.
✓ Branch 5 taken 286 times.
✗ Branch 6 not taken.
✓ Branch 7 taken 14 times.
✓ Branch 8 taken 42 times.
✓ Branch 9 taken 4276 times.
✓ Branch 10 taken 286 times.
 13400 || proxy.empty()) {
187 4520 return proxy;
188 }
189 42 return "http://" + proxy;
190 }
191
192
193 //------------------------------------------------------------------------------
194
195
196 atomic_int64 Host::global_id_ = 0;
197
198 262 const set<string> &Host::ViewBestAddresses(IpPreference preference) const {
199
2/2
✓ Branch 0 taken 42 times.
✓ Branch 1 taken 42 times.
 84 if (((preference == kIpPreferSystem) || (preference == kIpPreferV4))
200
6/6
✓ Branch 0 taken 84 times.
✓ Branch 1 taken 178 times.
✓ Branch 3 taken 192 times.
✓ Branch 4 taken 28 times.
✓ Branch 5 taken 192 times.
✓ Branch 6 taken 70 times.
 346 && HasIpv4()) {
201 192 return ipv4_addresses_;
202 }
203
6/6
✓ Branch 0 taken 42 times.
✓ Branch 1 taken 28 times.
✓ Branch 3 taken 14 times.
✓ Branch 4 taken 28 times.
✓ Branch 5 taken 14 times.
✓ Branch 6 taken 56 times.
 70 if ((preference == kIpPreferV6) && !HasIpv6())
204 14 return ipv4_addresses_;
205 56 return ipv6_addresses_;
206 }
207
208
209 12272 void Host::CopyFrom(const Host &other) {
210 12272 deadline_ = other.deadline_;
211 12272 id_ = other.id_;
212 12272 ipv4_addresses_ = other.ipv4_addresses_;
213 12272 ipv6_addresses_ = other.ipv6_addresses_;
214 12272 name_ = other.name_;
215 12272 status_ = other.status_;
216 12272 }
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 14 Host Host::ExtendDeadline(const Host &original, unsigned seconds_from_now) {
224 14 Host new_host(original);
225 14 new_host.id_ = atomic_xadd64(&global_id_, 1);
226 14 new_host.deadline_ = time(NULL) + seconds_from_now;
227 14 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 6825 Host::Host()
236 6825 : deadline_(0)
237 6825 , id_(atomic_xadd64(&global_id_, 1))
238 6825 , status_(kFailNotYetResolved) { }
239
240
241
1/2
✓ Branch 4 taken 10684 times.
✗ Branch 5 not taken.
 10684 Host::Host(const Host &other) { CopyFrom(other); }
242
243
244 1622 Host &Host::operator=(const Host &other) {
245
2/2
✓ Branch 0 taken 34 times.
✓ Branch 1 taken 1588 times.
 1622 if (&other == this)
246 34 return *this;
247 1588 CopyFrom(other);
248 1588 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 */
257 308 bool Host::IsEquivalent(const Host &other) const {
258
2/2
✓ Branch 0 taken 252 times.
✓ Branch 1 taken 14 times.
 266 return (status_ == kFailOk) && (other.status_ == kFailOk)
259
3/4
✓ Branch 1 taken 252 times.
✗ Branch 2 not taken.
✓ Branch 4 taken 224 times.
✓ Branch 5 taken 28 times.
 252 && (name_ == other.name_) && (ipv4_addresses_ == other.ipv4_addresses_)
260
4/4
✓ Branch 0 taken 266 times.
✓ Branch 1 taken 42 times.
✓ Branch 3 taken 168 times.
✓ Branch 4 taken 56 times.
 574 && (ipv6_addresses_ == other.ipv6_addresses_);
261 }
262
263
264 /**
265 * Compares the TTL from a provious call to time() with the current time.
266 */
267 332 bool Host::IsExpired() const {
268 332 const time_t now = time(NULL);
269
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 332 times.
 332 assert(now != static_cast<time_t>(-1));
270 332 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 */
279 224 bool Host::IsValid() const {
280
2/2
✓ Branch 0 taken 84 times.
✓ Branch 1 taken 140 times.
 224 if (status_ != kFailOk)
281 84 return false;
282
283
3/4
✓ Branch 1 taken 28 times.
✓ Branch 2 taken 112 times.
✗ Branch 4 not taken.
✓ Branch 5 taken 28 times.
 140 assert(!ipv4_addresses_.empty() || !ipv6_addresses_.empty());
284 140 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 26013 bool Resolver::IsIpv4Address(const string &address) {
296 // Are there any unexpected characters?
297
2/4
✓ Branch 2 taken 26013 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 26013 times.
✗ Branch 6 not taken.
 52026 const sanitizer::InputSanitizer sanitizer("09 .");
298
3/4
✓ Branch 1 taken 26013 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 10430 times.
✓ Branch 4 taken 15583 times.
 26013 if (!sanitizer.IsValid(address))
299 10430 return false;
300
301 // 4 octets in the range 0-255?
302
1/2
✓ Branch 1 taken 15583 times.
✗ Branch 2 not taken.
 15583 vector<string> octets = SplitString(address, '.');
303
2/2
✓ Branch 1 taken 14 times.
✓ Branch 2 taken 15569 times.
 15583 if (octets.size() != 4)
304 14 return false;
305
2/2
✓ Branch 0 taken 62276 times.
✓ Branch 1 taken 15555 times.
 77831 for (unsigned i = 0; i < 4; ++i) {
306
1/2
✓ Branch 2 taken 62276 times.
✗ Branch 3 not taken.
 62276 const uint64_t this_octet = String2Uint64(octets[i]);
307
2/2
✓ Branch 0 taken 14 times.
✓ Branch 1 taken 62262 times.
 62276 if (this_octet > 255)
308 14 return false;
309 }
310
311 15555 return true;
312 26013 }
313
314
315 /**
316 * Basic input validation to ensure that this could syntactically represent a
317 * valid IPv6 address.
318 */
319 616 bool Resolver::IsIpv6Address(const string &address) {
320 // Are there any unexpected characters?
321
2/4
✓ Branch 2 taken 616 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 616 times.
✗ Branch 6 not taken.
 1232 const sanitizer::InputSanitizer sanitizer("09 af AF :");
322
1/2
✓ Branch 1 taken 616 times.
✗ Branch 2 not taken.
 1232 return sanitizer.IsValid(address);
323 616 }
324
325
326 17901 Resolver::Resolver(const bool ipv4_only,
327 const unsigned retries,
328 17901 const unsigned timeout_ms)
329 17901 : ipv4_only_(ipv4_only)
330 17901 , retries_(retries)
331 17901 , timeout_ms_(timeout_ms)
332 17901 , throttle_(0)
333 17901 , min_ttl_(kDefaultMinTtl)
334 17901 , max_ttl_(kDefaultMaxTtl) {
335 17901 prng_.InitLocaltime();
336 17901 }
337
338
339 /**
340 * Wrapper around the vector interface.
341 */
342 887 Host Resolver::Resolve(const string &name) {
343 887 vector<string> names;
344
1/2
✓ Branch 1 taken 887 times.
✗ Branch 2 not taken.
 887 names.push_back(name);
345 887 vector<Host> hosts;
346
1/2
✓ Branch 1 taken 887 times.
✗ Branch 2 not taken.
 887 ResolveMany(names, &hosts);
347
1/2
✓ Branch 2 taken 887 times.
✗ Branch 3 not taken.
 1774 return hosts[0];
348 887 }
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 3127 void Resolver::ResolveMany(const vector<string> &names, vector<Host> *hosts) {
356 3127 const unsigned num = names.size();
357
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 3127 times.
 3127 if (num == 0)
358 ✗ return;
359
360
1/2
✓ Branch 2 taken 3127 times.
✗ Branch 3 not taken.
 3127 vector<vector<string> > ipv4_addresses(num);
361
1/2
✓ Branch 2 taken 3127 times.
✗ Branch 3 not taken.
 3127 vector<vector<string> > ipv6_addresses(num);
362
1/2
✓ Branch 2 taken 3127 times.
✗ Branch 3 not taken.
 3127 vector<Failures> failures(num);
363
1/2
✓ Branch 2 taken 3127 times.
✗ Branch 3 not taken.
 3127 vector<unsigned> ttls(num);
364
1/2
✓ Branch 2 taken 3127 times.
✗ Branch 3 not taken.
 3127 vector<string> fqdns(num);
365
1/2
✓ Branch 2 taken 3127 times.
✗ Branch 3 not taken.
 3127 vector<bool> skip(num);
366
367 // Deal with special names: empty, IPv4, IPv6
368
2/2
✓ Branch 0 taken 3511 times.
✓ Branch 1 taken 3127 times.
 6638 for (unsigned i = 0; i < num; ++i) {
369
2/2
✓ Branch 2 taken 2110 times.
✓ Branch 3 taken 1401 times.
 3511 if (names[i].empty()) {
370
1/2
✓ Branch 1 taken 2110 times.
✗ Branch 2 not taken.
 2110 LogCvmfs(kLogDns, kLogDebug, "empty hostname");
371 2110 Host invalid_host;
372
1/2
✓ Branch 1 taken 2110 times.
✗ Branch 2 not taken.
 2110 invalid_host.name_ = "";
373 2110 invalid_host.status_ = kFailInvalidHost;
374
1/2
✓ Branch 1 taken 2110 times.
✗ Branch 2 not taken.
 2110 hosts->push_back(invalid_host);
375
1/2
✓ Branch 1 taken 2110 times.
✗ Branch 2 not taken.
 2110 skip[i] = true;
376
3/4
✓ Branch 3 taken 1401 times.
✗ Branch 4 not taken.
✓ Branch 5 taken 239 times.
✓ Branch 6 taken 1162 times.
 3511 } else if (IsIpv4Address(names[i])) {
377
1/2
✓ Branch 3 taken 239 times.
✗ Branch 4 not taken.
 239 LogCvmfs(kLogDns, kLogDebug, "IPv4 address %s", names[i].c_str());
378 239 Host ipv4_host;
379
1/2
✓ Branch 2 taken 239 times.
✗ Branch 3 not taken.
 239 ipv4_host.name_ = names[i];
380 239 ipv4_host.status_ = kFailOk;
381
1/2
✓ Branch 2 taken 239 times.
✗ Branch 3 not taken.
 239 ipv4_host.ipv4_addresses_.insert(names[i]);
382 239 ipv4_host.deadline_ = time(NULL) + max_ttl_;
383
1/2
✓ Branch 1 taken 239 times.
✗ Branch 2 not taken.
 239 hosts->push_back(ipv4_host);
384
1/2
✓ Branch 1 taken 239 times.
✗ Branch 2 not taken.
 239 skip[i] = true;
385
2/2
✓ Branch 5 taken 56 times.
✓ Branch 6 taken 1036 times.
 2493 } else if ((names[i].length() >= 3) && (names[i][0] == '[')
386
5/6
✓ Branch 0 taken 1092 times.
✓ Branch 1 taken 70 times.
✓ Branch 6 taken 56 times.
✗ Branch 7 not taken.
✓ Branch 8 taken 56 times.
✓ Branch 9 taken 1106 times.
 2254 && (names[i][names[i].length() - 1] == ']')) {
387
1/2
✓ Branch 3 taken 56 times.
✗ Branch 4 not taken.
 56 LogCvmfs(kLogDns, kLogDebug, "IPv6 address %s", names[i].c_str());
388 56 Host ipv6_host;
389
1/2
✓ Branch 2 taken 56 times.
✗ Branch 3 not taken.
 56 ipv6_host.name_ = names[i];
390 56 ipv6_host.status_ = kFailOk;
391
1/2
✓ Branch 2 taken 56 times.
✗ Branch 3 not taken.
 56 ipv6_host.ipv6_addresses_.insert(names[i]);
392 56 ipv6_host.deadline_ = time(NULL) + max_ttl_;
393
1/2
✓ Branch 1 taken 56 times.
✗ Branch 2 not taken.
 56 hosts->push_back(ipv6_host);
394
1/2
✓ Branch 1 taken 56 times.
✗ Branch 2 not taken.
 56 skip[i] = true;
395 56 } else {
396
1/2
✓ Branch 2 taken 1106 times.
✗ Branch 3 not taken.
 1106 hosts->push_back(Host());
397
1/2
✓ Branch 1 taken 1106 times.
✗ Branch 2 not taken.
 1106 skip[i] = false;
398 }
399 }
400
401
1/2
✓ Branch 1 taken 3127 times.
✗ Branch 2 not taken.
 3127 DoResolve(names, skip, &ipv4_addresses, &ipv6_addresses, &failures, &ttls,
402 &fqdns);
403
404 // Construct host objects
405
2/2
✓ Branch 0 taken 3511 times.
✓ Branch 1 taken 3127 times.
 6638 for (unsigned i = 0; i < num; ++i) {
406
3/5
✓ Branch 1 taken 3511 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
✓ Branch 4 taken 2405 times.
✓ Branch 5 taken 1106 times.
 3511 if (skip[i])
407 2643 continue;
408
409 1106 Host host;
410
1/2
✓ Branch 2 taken 1106 times.
✗ Branch 3 not taken.
 1106 host.name_ = fqdns[i];
411 1106 host.status_ = failures[i];
412
413 1106 unsigned effective_ttl = ttls[i];
414
2/2
✓ Branch 0 taken 252 times.
✓ Branch 1 taken 854 times.
 1106 if (effective_ttl < min_ttl_) {
415 252 effective_ttl = min_ttl_;
416
2/2
✓ Branch 0 taken 28 times.
✓ Branch 1 taken 826 times.
 854 } else if (effective_ttl > max_ttl_) {
417 28 effective_ttl = max_ttl_;
418 }
419 1106 host.deadline_ = time(NULL) + effective_ttl;
420
421
2/2
✓ Branch 0 taken 238 times.
✓ Branch 1 taken 868 times.
 1106 if (host.status_ != kFailOk) {
422
1/2
✓ Branch 3 taken 238 times.
✗ Branch 4 not taken.
 476 LogCvmfs(kLogDns, kLogDebug, "failed to resolve %s - %d (%s), ttl %u",
423 238 names[i].c_str(), host.status_, Code2Ascii(host.status_),
424 effective_ttl);
425
1/2
✓ Branch 2 taken 238 times.
✗ Branch 3 not taken.
 238 (*hosts)[i] = host;
426 238 continue;
427 }
428
429 // Verify addresses and make them readily available for curl
430
2/2
✓ Branch 2 taken 980 times.
✓ Branch 3 taken 868 times.
 1848 for (unsigned j = 0; j < ipv4_addresses[i].size(); ++j) {
431
3/4
✓ Branch 3 taken 980 times.
✗ Branch 4 not taken.
✓ Branch 5 taken 56 times.
✓ Branch 6 taken 924 times.
 980 if (!IsIpv4Address(ipv4_addresses[i][j])) {
432
1/4
✓ Branch 3 taken 56 times.
✗ Branch 4 not taken.
✗ Branch 6 not taken.
✗ Branch 7 not taken.
 112 LogCvmfs(kLogDns, kLogDebug | kLogSyslogWarn,
433 "host name %s resolves to invalid IPv4 address %s",
434 112 names[i].c_str(), ipv4_addresses[i][j].c_str());
435 56 continue;
436 }
437
2/2
✓ Branch 2 taken 854 times.
✓ Branch 3 taken 70 times.
 924 if (names[i] == host.name_) {
438
1/2
✓ Branch 4 taken 854 times.
✗ Branch 5 not taken.
 854 LogCvmfs(kLogDns, kLogDebug, "add address %s -> %s", names[i].c_str(),
439 854 ipv4_addresses[i][j].c_str());
440 } else {
441
1/2
✓ Branch 4 taken 70 times.
✗ Branch 5 not taken.
 140 LogCvmfs(kLogDns, kLogDebug, "add address %s -> %s -> %s",
442 70 names[i].c_str(), host.name_.c_str(),
443 70 ipv4_addresses[i][j].c_str());
444 }
445
1/2
✓ Branch 3 taken 924 times.
✗ Branch 4 not taken.
 924 host.ipv4_addresses_.insert(ipv4_addresses[i][j]);
446 }
447
448
2/2
✓ Branch 2 taken 616 times.
✓ Branch 3 taken 868 times.
 1484 for (unsigned j = 0; j < ipv6_addresses[i].size(); ++j) {
449
3/4
✓ Branch 3 taken 616 times.
✗ Branch 4 not taken.
✓ Branch 5 taken 28 times.
✓ Branch 6 taken 588 times.
 616 if (!IsIpv6Address(ipv6_addresses[i][j])) {
450
1/4
✓ Branch 3 taken 28 times.
✗ Branch 4 not taken.
✗ Branch 6 not taken.
✗ Branch 7 not taken.
 56 LogCvmfs(kLogDns, kLogDebug | kLogSyslogWarn,
451 "host name %s resolves to invalid IPv6 address %s",
452 56 names[i].c_str(), ipv6_addresses[i][j].c_str());
453 28 continue;
454 }
455 // For URLs we need brackets around IPv6 addresses
456
2/2
✓ Branch 2 taken 546 times.
✓ Branch 3 taken 42 times.
 588 if (names[i] == host.name_) {
457
1/2
✓ Branch 4 taken 546 times.
✗ Branch 5 not taken.
 546 LogCvmfs(kLogDns, kLogDebug, "add address %s -> %s", names[i].c_str(),
458 546 ipv6_addresses[i][j].c_str());
459 } else {
460
1/2
✓ Branch 4 taken 42 times.
✗ Branch 5 not taken.
 84 LogCvmfs(kLogDns, kLogDebug, "add address %s -> %s -> %s",
461 42 names[i].c_str(), host.name_.c_str(),
462 42 ipv6_addresses[i][j].c_str());
463 }
464
3/6
✓ Branch 3 taken 588 times.
✗ Branch 4 not taken.
✓ Branch 6 taken 588 times.
✗ Branch 7 not taken.
✓ Branch 9 taken 588 times.
✗ Branch 10 not taken.
 588 host.ipv6_addresses_.insert("[" + ipv6_addresses[i][j] + "]");
465 }
466
467
6/6
✓ Branch 1 taken 70 times.
✓ Branch 2 taken 798 times.
✓ Branch 4 taken 42 times.
✓ Branch 5 taken 28 times.
✓ Branch 6 taken 42 times.
✓ Branch 7 taken 826 times.
 868 if (host.ipv4_addresses_.empty() && host.ipv6_addresses_.empty()) {
468
1/2
✓ Branch 2 taken 42 times.
✗ Branch 3 not taken.
 42 LogCvmfs(kLogDns, kLogDebug, "no addresses returned for %s",
469 42 names[i].c_str());
470 42 host.status_ = kFailNoAddress;
471 }
472
473 // Remove surplus IP addresses
474
2/2
✓ Branch 0 taken 14 times.
✓ Branch 1 taken 854 times.
 868 if (throttle_ > 0) {
475
2/2
✓ Branch 1 taken 28 times.
✓ Branch 2 taken 14 times.
 42 while (host.ipv4_addresses_.size() > throttle_) {
476 28 const unsigned random = prng_.Next(host.ipv4_addresses_.size());
477 28 set<string>::iterator rnd_itr = host.ipv4_addresses_.begin();
478
1/2
✓ Branch 1 taken 28 times.
✗ Branch 2 not taken.
 28 std::advance(rnd_itr, random);
479
1/2
✓ Branch 1 taken 28 times.
✗ Branch 2 not taken.
 28 host.ipv4_addresses_.erase(rnd_itr);
480 }
481
2/2
✓ Branch 1 taken 28 times.
✓ Branch 2 taken 14 times.
 42 while (host.ipv6_addresses_.size() > throttle_) {
482 28 const unsigned random = prng_.Next(host.ipv6_addresses_.size());
483 28 set<string>::iterator rnd_itr = host.ipv6_addresses_.begin();
484
1/2
✓ Branch 1 taken 28 times.
✗ Branch 2 not taken.
 28 std::advance(rnd_itr, random);
485
1/2
✓ Branch 1 taken 28 times.
✗ Branch 2 not taken.
 28 host.ipv6_addresses_.erase(rnd_itr);
486 }
487 }
488
489
1/2
✓ Branch 2 taken 868 times.
✗ Branch 3 not taken.
 868 (*hosts)[i] = host;
490
2/2
✓ Branch 1 taken 868 times.
✓ Branch 2 taken 238 times.
 1106 }
491 3127 }
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 {
511 854 QueryInfo(vector<string> *a, const string &n, const ResourceRecord r)
512 854 : addresses(a)
513 854 , complete(false)
514 854 , fqdn(n)
515
1/2
✓ Branch 1 taken 854 times.
✗ Branch 2 not taken.
 854 , name(n)
516 854 , record(r)
517 854 , status(kFailOther)
518 854 , 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 */
543 854 static void CallbackCares(void *arg, int status, int timeouts_ms,
544 unsigned char *abuf, int alen) {
545 854 QueryInfo *info = reinterpret_cast<QueryInfo *>(arg);
546
547 854 info->complete = true;
548
5/7
✓ Branch 0 taken 658 times.
✓ Branch 1 taken 28 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 112 times.
✓ Branch 4 taken 42 times.
✓ Branch 5 taken 14 times.
✗ Branch 6 not taken.
 854 switch (status) {
549 658 case ARES_SUCCESS:
550 Failures retval;
551
2/3
✓ Branch 0 taken 336 times.
✓ Branch 1 taken 322 times.
✗ Branch 2 not taken.
 658 switch (info->record) {
552 336 case kRrA:
553 336 retval = CaresExtractIpv4(abuf, alen, info->addresses, &info->ttl,
554 &info->fqdn);
555 336 break;
556 322 case kRrAaaa:
557 322 retval = CaresExtractIpv6(abuf, alen, info->addresses, &info->ttl,
558 &info->fqdn);
559 322 break;
560 ✗ default:
561 // Never here.
562 ✗ PANIC(NULL);
563 }
564 658 info->status = retval;
565 658 break;
566 28 case ARES_ENODATA:
567 28 info->status = kFailUnknownHost;
568 28 break;
569 ✗ case ARES_EFORMERR:
570 ✗ info->status = kFailMalformed;
571 ✗ break;
572 112 case ARES_ENOTFOUND:
573 112 info->status = kFailUnknownHost;
574 112 break;
575 42 case ARES_ETIMEOUT:
576 42 info->status = kFailTimeout;
577 42 break;
578 14 case ARES_ECONNREFUSED:
579 14 info->status = kFailInvalidResolvers;
580 14 break;
581 ✗ default:
582 ✗ info->status = kFailOther;
583 }
584 854 }
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 */
591 336 static Failures CaresExtractIpv4(const unsigned char *abuf,
592 int alen,
593 vector<string> *addresses,
594 unsigned *ttl,
595 string *fqdn) {
596 336 struct hostent *host_entry = NULL;
597 struct ares_addrttl records[CaresResolver::kMaxAddresses];
598 336 int naddrttls = CaresResolver::kMaxAddresses;
599
1/2
✓ Branch 1 taken 336 times.
✗ Branch 2 not taken.
 336 const int retval = ares_parse_a_reply(abuf, alen, &host_entry, records,
600 &naddrttls);
601
602
1/3
✓ Branch 0 taken 336 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
 336 switch (retval) {
603 336 case ARES_SUCCESS:
604
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 336 times.
 336 if (host_entry == NULL)
605 ✗ return kFailMalformed;
606
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 336 times.
 336 if (host_entry->h_name == NULL) {
607 ✗ ares_free_hostent(host_entry);
608 ✗ return kFailMalformed;
609 }
610
1/2
✓ Branch 2 taken 336 times.
✗ Branch 3 not taken.
 336 *fqdn = string(host_entry->h_name);
611
1/2
✓ Branch 1 taken 336 times.
✗ Branch 2 not taken.
 336 ares_free_hostent(host_entry);
612
613
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 336 times.
 336 if (naddrttls <= 0)
614 ✗ return kFailMalformed;
615 336 *ttl = unsigned(-1);
616
2/2
✓ Branch 0 taken 336 times.
✓ Branch 1 taken 336 times.
 672 for (unsigned i = 0; i < static_cast<unsigned>(naddrttls); ++i) {
617
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 336 times.
 336 if (records[i].ttl < 0)
618 ✗ continue;
619 336 *ttl = std::min(unsigned(records[i].ttl), *ttl);
620
621 char addrstr[INET_ADDRSTRLEN];
622 336 const void *retval_p = inet_ntop(AF_INET, &(records[i].ipaddr), addrstr,
623 INET_ADDRSTRLEN);
624
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 336 times.
 336 if (!retval_p)
625 ✗ continue;
626
2/4
✓ Branch 2 taken 336 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 336 times.
✗ Branch 6 not taken.
 336 addresses->push_back(addrstr);
627 }
628
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 336 times.
 336 if (addresses->empty())
629 ✗ return kFailMalformed;
630 336 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
641 322 static Failures CaresExtractIpv6(const unsigned char *abuf,
642 int alen,
643 vector<string> *addresses,
644 unsigned *ttl,
645 string *fqdn) {
646 322 struct hostent *host_entry = NULL;
647 struct ares_addr6ttl records[CaresResolver::kMaxAddresses];
648 322 int naddrttls = CaresResolver::kMaxAddresses;
649
1/2
✓ Branch 1 taken 322 times.
✗ Branch 2 not taken.
 322 const int retval = ares_parse_aaaa_reply(abuf, alen, &host_entry, records,
650 &naddrttls);
651
652
1/3
✓ Branch 0 taken 322 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
 322 switch (retval) {
653 322 case ARES_SUCCESS:
654
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 322 times.
 322 if (host_entry == NULL)
655 ✗ return kFailMalformed;
656
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 322 times.
 322 if (host_entry->h_name == NULL) {
657 ✗ ares_free_hostent(host_entry);
658 ✗ return kFailMalformed;
659 }
660
1/2
✓ Branch 2 taken 322 times.
✗ Branch 3 not taken.
 322 *fqdn = string(host_entry->h_name);
661
1/2
✓ Branch 1 taken 322 times.
✗ Branch 2 not taken.
 322 ares_free_hostent(host_entry);
662
663
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 322 times.
 322 if (naddrttls <= 0)
664 ✗ return kFailMalformed;
665 322 *ttl = unsigned(-1);
666
2/2
✓ Branch 0 taken 322 times.
✓ Branch 1 taken 322 times.
 644 for (unsigned i = 0; i < static_cast<unsigned>(naddrttls); ++i) {
667
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 322 times.
 322 if (records[i].ttl < 0)
668 ✗ continue;
669 322 *ttl = std::min(unsigned(records[i].ttl), *ttl);
670
671 char addrstr[INET6_ADDRSTRLEN];
672 322 const void *retval_p = inet_ntop(AF_INET6, &(records[i].ip6addr),
673 addrstr, INET6_ADDRSTRLEN);
674
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 322 times.
 322 if (!retval_p)
675 ✗ continue;
676
2/4
✓ Branch 2 taken 322 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 322 times.
✗ Branch 6 not taken.
 322 addresses->push_back(addrstr);
677 }
678
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 322 times.
 322 if (addresses->empty())
679 ✗ return kFailMalformed;
680 322 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 6595 CaresResolver::CaresResolver(const bool ipv4_only,
692 const unsigned retries,
693 6595 const unsigned timeout_ms)
694 : Resolver(ipv4_only, retries, timeout_ms)
695 6595 , channel_(NULL)
696 6595 , lookup_options_(strdup("b")) { }
697
698
699 26220 CaresResolver::~CaresResolver() {
700
1/2
✓ Branch 0 taken 6555 times.
✗ Branch 1 not taken.
 13110 if (channel_) {
701 13110 ares_destroy(*channel_);
702 13110 free(channel_);
703 }
704 13110 free(lookup_options_);
705 26220 }
706
707
708 /**
709 * Returns a CaresResolver readily initialized, or NULL if an error occurs.
710 */
711 6595 CaresResolver *CaresResolver::Create(const bool ipv4_only,
712 const unsigned retries,
713 const unsigned timeout_ms) {
714 int retval;
715
2/2
✓ Branch 1 taken 49 times.
✓ Branch 2 taken 6546 times.
 6595 if (getenv("HOSTALIASES") == NULL) {
716 49 retval = setenv("HOSTALIASES", "/etc/hosts", 1);
717
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 49 times.
 49 assert(retval == 0);
718 }
719
720
1/2
✓ Branch 1 taken 6595 times.
✗ Branch 2 not taken.
 6595 CaresResolver *resolver = new CaresResolver(ipv4_only, retries, timeout_ms);
721 6595 resolver->channel_ = reinterpret_cast<ares_channel *>(
722 6595 smalloc(sizeof(ares_channel)));
723 6595 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 6595 memset(&options, 0, sizeof(options));
730 6595 options.timeout = timeout_ms;
731 6595 options.tries = 1 + retries;
732 6595 options.lookups = resolver->lookup_options_;
733 6595 optmask = ARES_OPT_TIMEOUTMS | ARES_OPT_TRIES | ARES_OPT_LOOKUPS;
734
1/2
✓ Branch 1 taken 6595 times.
✗ Branch 2 not taken.
 6595 retval = ares_init_options(resolver->channel_, &options, optmask);
735
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 6595 times.
 6595 if (retval != ARES_SUCCESS)
736 ✗ goto create_fail;
737
738 // Save search domains
739
1/2
✓ Branch 1 taken 6595 times.
✗ Branch 2 not taken.
 6595 retval = ares_save_options(*resolver->channel_, &options, &optmask);
740
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 6595 times.
 6595 if (retval != ARES_SUCCESS)
741 ✗ goto create_fail;
742
2/2
✓ Branch 0 taken 6595 times.
✓ Branch 1 taken 6595 times.
 13190 for (int i = 0; i < options.ndomains; ++i) {
743
2/4
✓ Branch 2 taken 6595 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 6595 times.
✗ Branch 6 not taken.
 6595 resolver->domains_.push_back(options.domains[i]);
744 }
745
1/2
✓ Branch 1 taken 6595 times.
✗ Branch 2 not taken.
 6595 ares_destroy_options(&options);
746
1/2
✓ Branch 1 taken 6595 times.
✗ Branch 2 not taken.
 6595 resolver->system_domains_ = resolver->domains_;
747
748 // Save the system default resolvers
749 6595 addresses = NULL;
750
1/2
✓ Branch 1 taken 6595 times.
✗ Branch 2 not taken.
 6595 retval = ares_get_servers(*resolver->channel_, &addresses);
751
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 6595 times.
 6595 if (retval != ARES_SUCCESS)
752 ✗ goto create_fail;
753 6595 iter = addresses;
754
2/2
✓ Branch 0 taken 32975 times.
✓ Branch 1 taken 6595 times.
 39570 while (iter) {
755
2/3
✓ Branch 0 taken 19785 times.
✓ Branch 1 taken 13190 times.
✗ Branch 2 not taken.
 32975 switch (iter->family) {
756 19785 case AF_INET: {
757 char addrstr[INET_ADDRSTRLEN];
758 19785 const void *retval_p = inet_ntop(AF_INET, &(iter->addr), addrstr,
759 INET_ADDRSTRLEN);
760
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 19785 times.
 19785 if (!retval_p) {
761 ✗ LogCvmfs(kLogDns, kLogDebug | kLogSyslogErr,
762 "invalid system name resolver");
763 } else {
764
3/6
✓ Branch 2 taken 19785 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 19785 times.
✗ Branch 6 not taken.
✓ Branch 8 taken 19785 times.
✗ Branch 9 not taken.
 19785 resolver->resolvers_.push_back(string(addrstr) + ":53");
765 }
766 19785 break;
767 }
768 13190 case AF_INET6: {
769 char addrstr[INET6_ADDRSTRLEN];
770 13190 const void *retval_p = inet_ntop(AF_INET6, &(iter->addr), addrstr,
771 INET6_ADDRSTRLEN);
772
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 13190 times.
 13190 if (!retval_p) {
773 ✗ LogCvmfs(kLogDns, kLogDebug | kLogSyslogErr,
774 "invalid system name resolver");
775 } else {
776
4/8
✓ Branch 2 taken 13190 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 13190 times.
✗ Branch 6 not taken.
✓ Branch 8 taken 13190 times.
✗ Branch 9 not taken.
✓ Branch 11 taken 13190 times.
✗ Branch 12 not taken.
 13190 resolver->resolvers_.push_back("[" + string(addrstr) + "]:53");
777 }
778 13190 break;
779 }
780 ✗ default:
781 // Never here.
782 ✗ PANIC(NULL);
783 }
784 32975 iter = iter->next;
785 }
786
1/2
✓ Branch 1 taken 6595 times.
✗ Branch 2 not taken.
 6595 ares_free_data(addresses);
787
1/2
✓ Branch 1 taken 6595 times.
✗ Branch 2 not taken.
 6595 resolver->system_resolvers_ = resolver->resolvers_;
788
789 6595 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 2469 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 2469 const unsigned num = names.size();
814
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2469 times.
 2469 if (num == 0)
815 ✗ return;
816
817
1/2
✓ Branch 2 taken 2469 times.
✗ Branch 3 not taken.
 2469 vector<QueryInfo *> infos_ipv4(num, NULL);
818
1/2
✓ Branch 2 taken 2469 times.
✗ Branch 3 not taken.
 2469 vector<QueryInfo *> infos_ipv6(num, NULL);
819
820
2/2
✓ Branch 0 taken 2769 times.
✓ Branch 1 taken 2469 times.
 5238 for (unsigned i = 0; i < num; ++i) {
821
3/4
✓ Branch 1 taken 2769 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 2335 times.
✓ Branch 4 taken 434 times.
 2769 if (skip[i])
822 2335 continue;
823
824
2/2
✓ Branch 1 taken 420 times.
✓ Branch 2 taken 14 times.
 434 if (!ipv4_only()) {
825
2/4
✓ Branch 3 taken 420 times.
✗ Branch 4 not taken.
✓ Branch 6 taken 420 times.
✗ Branch 7 not taken.
 420 infos_ipv6[i] = new QueryInfo(&(*ipv6_addresses)[i], names[i], kRrAaaa);
826
1/2
✓ Branch 3 taken 420 times.
✗ Branch 4 not taken.
 420 ares_search(*channel_, names[i].c_str(), ns_c_in, ns_t_aaaa,
827 420 CallbackCares, infos_ipv6[i]);
828 }
829
2/4
✓ Branch 3 taken 434 times.
✗ Branch 4 not taken.
✓ Branch 6 taken 434 times.
✗ Branch 7 not taken.
 434 infos_ipv4[i] = new QueryInfo(&(*ipv4_addresses)[i], names[i], kRrA);
830
1/2
✓ Branch 3 taken 434 times.
✗ Branch 4 not taken.
 434 ares_search(*channel_, names[i].c_str(), ns_c_in, ns_t_a, CallbackCares,
831 434 infos_ipv4[i]);
832 }
833
834 bool all_complete;
835 do {
836 23367391 all_complete = true;
837
1/2
✓ Branch 1 taken 23367391 times.
✗ Branch 2 not taken.
 23367391 WaitOnCares();
838
2/2
✓ Branch 0 taken 23369301 times.
✓ Branch 1 taken 2469 times.
 23371770 for (unsigned i = 0; i < num; ++i) {
839
2/2
✓ Branch 2 taken 2296 times.
✓ Branch 3 taken 23364614 times.
 46736211 if ((infos_ipv4[i] && !infos_ipv4[i]->complete)
840
8/8
✓ Branch 0 taken 23366910 times.
✓ Branch 1 taken 2391 times.
✓ Branch 3 taken 2282 times.
✓ Branch 4 taken 2405 times.
✓ Branch 6 taken 308 times.
✓ Branch 7 taken 1974 times.
✓ Branch 8 taken 23364922 times.
✓ Branch 9 taken 4379 times.
 46736211 || (infos_ipv6[i] && !infos_ipv6[i]->complete)) {
841 23364922 all_complete = false;
842 23364922 break;
843 }
844 }
845
2/2
✓ Branch 0 taken 23364922 times.
✓ Branch 1 taken 2469 times.
 23367391 } while (!all_complete);
846
847 // Silently ignore errors with IPv4/6 if there are at least some usable IP
848 // addresses.
849
2/2
✓ Branch 0 taken 2769 times.
✓ Branch 1 taken 2469 times.
 5238 for (unsigned i = 0; i < num; ++i) {
850
3/4
✓ Branch 1 taken 2769 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 2335 times.
✓ Branch 4 taken 434 times.
 2769 if (skip[i])
851 2335 continue;
852
853 434 Failures status = kFailOther;
854 434 (*ttls)[i] = unsigned(-1);
855
1/2
✓ Branch 2 taken 434 times.
✗ Branch 3 not taken.
 434 (*fqdns)[i] = "";
856
2/2
✓ Branch 1 taken 420 times.
✓ Branch 2 taken 14 times.
 434 if (infos_ipv6[i]) {
857 420 status = infos_ipv6[i]->status;
858
2/2
✓ Branch 0 taken 322 times.
✓ Branch 1 taken 98 times.
 420 if (status == kFailOk) {
859 322 (*ttls)[i] = std::min(infos_ipv6[i]->ttl, (*ttls)[i]);
860
1/2
✓ Branch 3 taken 322 times.
✗ Branch 4 not taken.
 322 (*fqdns)[i] = infos_ipv6[i]->fqdn;
861 }
862 }
863
1/2
✓ Branch 1 taken 434 times.
✗ Branch 2 not taken.
 434 if (infos_ipv4[i]) {
864 434 (*ttls)[i] = std::min(infos_ipv4[i]->ttl, (*ttls)[i]);
865
2/2
✓ Branch 2 taken 112 times.
✓ Branch 3 taken 322 times.
 434 if ((*fqdns)[i] == "")
866
1/2
✓ Branch 3 taken 112 times.
✗ Branch 4 not taken.
 112 (*fqdns)[i] = infos_ipv4[i]->fqdn;
867
2/2
✓ Branch 0 taken 112 times.
✓ Branch 1 taken 322 times.
 434 if (status != kFailOk)
868 112 status = infos_ipv4[i]->status;
869 }
870 434 (*failures)[i] = status;
871 }
872
873
2/2
✓ Branch 0 taken 2769 times.
✓ Branch 1 taken 2469 times.
 5238 for (unsigned i = 0; i < num; ++i) {
874
2/2
✓ Branch 1 taken 434 times.
✓ Branch 2 taken 2335 times.
 2769 delete infos_ipv4[i];
875
2/2
✓ Branch 1 taken 420 times.
✓ Branch 2 taken 2349 times.
 2769 delete infos_ipv6[i];
876 }
877 2469 }
878
879
880 42 bool CaresResolver::SetResolvers(const vector<string> &resolvers) {
881
2/4
✓ Branch 2 taken 42 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 42 times.
✗ Branch 6 not taken.
 84 const string address_list = JoinStrings(resolvers, ",");
882
1/2
✓ Branch 2 taken 42 times.
✗ Branch 3 not taken.
 42 const int retval = ares_set_servers_csv(*channel_, address_list.c_str());
883
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 42 times.
 42 if (retval != ARES_SUCCESS)
884 ✗ return false;
885
886
1/2
✓ Branch 1 taken 42 times.
✗ Branch 2 not taken.
 42 resolvers_ = resolvers;
887 42 return true;
888 42 }
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 28 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 28 memcpy(&ares_channelhead, *channel_, sizeof(ares_channelhead));
914
1/2
✓ Branch 0 taken 28 times.
✗ Branch 1 not taken.
 28 if (ares_channelhead.domains) {
915
2/2
✓ Branch 0 taken 42 times.
✓ Branch 1 taken 28 times.
 70 for (int i = 0; i < ares_channelhead.ndomains; ++i) {
916 42 free(ares_channelhead.domains[i]);
917 }
918 28 free(ares_channelhead.domains);
919 28 ares_channelhead.domains = NULL;
920 }
921
922 28 ares_channelhead.ndomains = static_cast<int>(domains.size());
923
2/2
✓ Branch 0 taken 14 times.
✓ Branch 1 taken 14 times.
 28 if (ares_channelhead.ndomains > 0) {
924 14 ares_channelhead.domains = reinterpret_cast<char **>(
925 14 smalloc(ares_channelhead.ndomains * sizeof(char *)));
926
2/2
✓ Branch 0 taken 28 times.
✓ Branch 1 taken 14 times.
 42 for (int i = 0; i < ares_channelhead.ndomains; ++i) {
927 28 ares_channelhead.domains[i] = strdup(domains[i].c_str());
928 }
929 }
930
931 28 memcpy(*channel_, &ares_channelhead, sizeof(ares_channelhead));
932
933
1/2
✓ Branch 1 taken 28 times.
✗ Branch 2 not taken.
 28 domains_ = domains;
934 28 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 23367391 void CaresResolver::WaitOnCares() {
955 // Adapted from libcurl
956 ares_socket_t socks[ARES_GETSOCK_MAXNUM];
957 struct pollfd pfd[ARES_GETSOCK_MAXNUM];
958
1/2
✓ Branch 1 taken 23367391 times.
✗ Branch 2 not taken.
 23367391 const int bitmask = ares_getsock(*channel_, socks, ARES_GETSOCK_MAXNUM);
959 23367391 unsigned num = 0;
960
1/2
✓ Branch 0 taken 46732523 times.
✗ Branch 1 not taken.
 46732523 for (unsigned i = 0; i < ARES_GETSOCK_MAXNUM; ++i) {
961 46732523 pfd[i].events = 0;
962 46732523 pfd[i].revents = 0;
963
2/2
✓ Branch 0 taken 23365132 times.
✓ Branch 1 taken 23367391 times.
 46732523 if (ARES_GETSOCK_READABLE(bitmask, i)) {
964 23365132 pfd[i].fd = socks[i];
965 23365132 pfd[i].events |= POLLRDNORM | POLLIN;
966 }
967
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 46732523 times.
 46732523 if (ARES_GETSOCK_WRITABLE(bitmask, i)) {
968 ✗ pfd[i].fd = socks[i];
969 ✗ pfd[i].events |= POLLWRNORM | POLLOUT;
970 }
971
2/2
✓ Branch 0 taken 23365132 times.
✓ Branch 1 taken 23367391 times.
 46732523 if (pfd[i].events != 0)
972 23365132 num++;
973 else
974 23367391 break;
975 }
976
977 23367391 int nfds = 0;
978
2/2
✓ Branch 0 taken 23365132 times.
✓ Branch 1 taken 2259 times.
 23367391 if (num > 0) {
979 do {
980
1/2
✓ Branch 2 taken 23365132 times.
✗ Branch 3 not taken.
 23365132 nfds = poll(pfd, num, timeout_ms());
981
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 23365132 times.
 23365132 if (nfds == -1) {
982 // poll must not fail for other reasons
983 ✗ if ((errno != EAGAIN) && (errno != EINTR))
984 ✗ PANIC(NULL);
985 }
986
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 23365132 times.
 23365132 } while (nfds == -1);
987 }
988
989
2/2
✓ Branch 0 taken 2343 times.
✓ Branch 1 taken 23365048 times.
 23367391 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
1/2
✓ Branch 1 taken 2343 times.
✗ Branch 2 not taken.
 2343 ares_process_fd(*channel_, ARES_SOCKET_BAD, ARES_SOCKET_BAD);
993 } else {
994 // Go through the descriptors and ask for executing the callbacks.
995
2/2
✓ Branch 0 taken 23365048 times.
✓ Branch 1 taken 23365048 times.
 46730096 for (unsigned i = 0; i < num; ++i) {
996 46730096 ares_process_fd(
997
1/2
✓ Branch 1 taken 23365048 times.
✗ Branch 2 not taken.
 23365048 *channel_,
998
2/2
✓ Branch 0 taken 896 times.
✓ Branch 1 taken 23364152 times.
 23365048 pfd[i].revents & (POLLRDNORM | POLLIN) ? pfd[i].fd : ARES_SOCKET_BAD,
999
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 23365048 times.
 23365048 pfd[i].revents & (POLLWRNORM | POLLOUT) ? pfd[i].fd
1000 : ARES_SOCKET_BAD);
1001 }
1002 }
1003 23367391 }
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 5968 HostfileResolver *HostfileResolver::Create(const string &path, bool ipv4_only) {
1015
1/2
✓ Branch 1 taken 5968 times.
✗ Branch 2 not taken.
 5968 HostfileResolver *resolver = new HostfileResolver(ipv4_only);
1016
1017
1/2
✓ Branch 1 taken 5968 times.
✗ Branch 2 not taken.
 5968 string hosts_file = path;
1018
2/2
✓ Branch 1 taken 5324 times.
✓ Branch 2 taken 644 times.
 5968 if (hosts_file == "") {
1019 5324 char *hosts_env = getenv("HOST_ALIASES");
1020
2/2
✓ Branch 0 taken 28 times.
✓ Branch 1 taken 5296 times.
 5324 if (hosts_env != NULL) {
1021
1/2
✓ Branch 2 taken 28 times.
✗ Branch 3 not taken.
 28 hosts_file = string(hosts_env);
1022 } else {
1023
1/2
✓ Branch 1 taken 5296 times.
✗ Branch 2 not taken.
 5296 hosts_file = "/etc/hosts";
1024 }
1025 }
1026
1/2
✓ Branch 2 taken 5968 times.
✗ Branch 3 not taken.
 5968 resolver->fhosts_ = fopen(hosts_file.c_str(), "r");
1027
2/2
✓ Branch 0 taken 28 times.
✓ Branch 1 taken 5940 times.
 5968 if (!resolver->fhosts_) {
1028
1/2
✓ Branch 2 taken 28 times.
✗ Branch 3 not taken.
 28 LogCvmfs(kLogDns, kLogDebug | kLogSyslogWarn, "failed to read host file %s",
1029 hosts_file.c_str());
1030
1/2
✓ Branch 0 taken 28 times.
✗ Branch 1 not taken.
 28 delete resolver;
1031 28 return NULL;
1032 }
1033 5940 return resolver;
1034 5968 }
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 84 static bool SortNameLength(const string &a, const string &b) {
1043 84 const unsigned len_a = a.length();
1044 84 const unsigned len_b = b.length();
1045
1/2
✓ Branch 0 taken 84 times.
✗ Branch 1 not taken.
 84 if (len_a != len_b)
1046 84 return len_a > len_b;
1047 ✗ return a > b;
1048 }
1049
1050
1051 /**
1052 * Creates a fresh reverse lookup map
1053 */
1054 2660 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 2660 const unsigned num = names.size();
1062
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2660 times.
 2660 if (num == 0)
1063 ✗ return;
1064
1065 2660 ParseHostFile();
1066
2/2
✓ Branch 0 taken 2778 times.
✓ Branch 1 taken 2660 times.
 5438 for (unsigned i = 0; i < num; ++i) {
1067
3/4
✓ Branch 1 taken 2778 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 2288 times.
✓ Branch 4 taken 490 times.
 2778 if (skip[i])
1068 2288 continue;
1069
1070 490 vector<string> effective_names;
1071
5/6
✓ Branch 2 taken 490 times.
✗ Branch 3 not taken.
✓ Branch 8 taken 28 times.
✓ Branch 9 taken 462 times.
✓ Branch 10 taken 28 times.
✓ Branch 11 taken 462 times.
 490 if (!names[i].empty() && (names[i][names[i].length() - 1] == '.')) {
1072
2/4
✓ Branch 4 taken 28 times.
✗ Branch 5 not taken.
✓ Branch 7 taken 28 times.
✗ Branch 8 not taken.
 28 effective_names.push_back(names[i].substr(0, names[i].length() - 1));
1073 } else {
1074
1/2
✓ Branch 2 taken 462 times.
✗ Branch 3 not taken.
 462 effective_names.push_back(names[i]);
1075
2/2
✓ Branch 2 taken 84 times.
✓ Branch 3 taken 462 times.
 546 for (unsigned j = 0; j < domains().size(); ++j) {
1076
3/6
✓ Branch 4 taken 84 times.
✗ Branch 5 not taken.
✓ Branch 7 taken 84 times.
✗ Branch 8 not taken.
✓ Branch 10 taken 84 times.
✗ Branch 11 not taken.
 84 effective_names.push_back(names[i] + "." + domains()[j]);
1077 }
1078 }
1079
1080 // Use the longest matching name as fqdn
1081
1/2
✓ Branch 3 taken 490 times.
✗ Branch 4 not taken.
 490 std::sort(effective_names.begin(), effective_names.end(), SortNameLength);
1082
1083 490 (*failures)[i] = kFailUnknownHost;
1084
1/2
✓ Branch 3 taken 490 times.
✗ Branch 4 not taken.
 490 (*fqdns)[i] = names[i];
1085
2/2
✓ Branch 1 taken 532 times.
✓ Branch 2 taken 140 times.
 672 for (unsigned j = 0; j < effective_names.size(); ++j) {
1086
1/2
✓ Branch 1 taken 532 times.
✗ Branch 2 not taken.
 532 const map<string, HostEntry>::iterator iter = host_map_.find(
1087 532 effective_names[j]);
1088
2/2
✓ Branch 2 taken 350 times.
✓ Branch 3 taken 182 times.
 532 if (iter != host_map_.end()) {
1089
1/2
✓ Branch 7 taken 350 times.
✗ Branch 8 not taken.
 1050 (*ipv4_addresses)[i].insert((*ipv4_addresses)[i].end(),
1090 350 iter->second.ipv4_addresses.begin(),
1091 350 iter->second.ipv4_addresses.end());
1092
1/2
✓ Branch 7 taken 350 times.
✗ Branch 8 not taken.
 1050 (*ipv6_addresses)[i].insert((*ipv6_addresses)[i].end(),
1093 350 iter->second.ipv6_addresses.begin(),
1094 350 iter->second.ipv6_addresses.end());
1095 350 (*ttls)[i] = min_ttl_;
1096
1/2
✓ Branch 3 taken 350 times.
✗ Branch 4 not taken.
 350 (*fqdns)[i] = effective_names[j];
1097 350 (*failures)[i] = kFailOk;
1098 350 break;
1099 } // Host name found
1100 } // All possible names (search domains added)
1101 490 }
1102 }
1103
1104
1105 5968 HostfileResolver::HostfileResolver(const bool ipv4_only)
1106 5968 : Resolver(ipv4_only, 0, 0), fhosts_(NULL) { }
1107
1108
1109 23868 HostfileResolver::~HostfileResolver() {
1110
2/2
✓ Branch 0 taken 5939 times.
✓ Branch 1 taken 28 times.
 11934 if (fhosts_)
1111 11878 fclose(fhosts_);
1112 23868 }
1113
1114
1115 /**
1116 * TODO: this should be only necessary when the modification timestamp changed.
1117 */
1118 2660 void HostfileResolver::ParseHostFile() {
1119
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2660 times.
 2660 assert(fhosts_);
1120
1/2
✓ Branch 1 taken 2660 times.
✗ Branch 2 not taken.
 2660 rewind(fhosts_);
1121 2660 host_map_.clear();
1122
1123 2660 string line;
1124
3/4
✓ Branch 1 taken 10584 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 7924 times.
✓ Branch 4 taken 2660 times.
 10584 while (GetLineFile(fhosts_, &line)) {
1125 char address[kIpMaxLength + 1];
1126 char hostname[kHostnameMaxLength + 1];
1127 int bytes_read;
1128 7924 size_t str_offset = 0;
1129
1130 // strip comments
1131 7924 const size_t hash_pos = line.find_first_of('#');
1132
2/2
✓ Branch 0 taken 140 times.
✓ Branch 1 taken 7784 times.
 7924 if (hash_pos != string::npos)
1133
1/2
✓ Branch 1 taken 140 times.
✗ Branch 2 not taken.
 140 line = line.substr(0, hash_pos);
1134
1135 // First token is an IP address
1136 7924 int ip_start_pos = -1, ip_end_pos = -1, scan_result;
1137 7924 scan_result = sscanf(line.c_str(), " %n%*s%n", &ip_start_pos, &ip_end_pos);
1138
2/2
✓ Branch 0 taken 196 times.
✓ Branch 1 taken 7728 times.
 7924 if (scan_result == EOF)
1139 224 continue;
1140
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 7728 times.
 7728 assert(ip_start_pos != -1);
1141
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 7728 times.
 7728 assert(ip_end_pos != -1);
1142
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 7728 times.
 7728 if (ip_start_pos == ip_end_pos)
1143 ✗ continue;
1144
2/2
✓ Branch 0 taken 28 times.
✓ Branch 1 taken 7700 times.
 7728 if (ip_end_pos - ip_start_pos > kIpMaxLength) {
1145
1/2
✓ Branch 2 taken 28 times.
✗ Branch 3 not taken.
 28 LogCvmfs(
1146 kLogDns, kLogSyslogWarn,
1147 "Skipping line in hosts file due to invalid IP address format: %s",
1148 line.c_str());
1149 28 continue;
1150 }
1151
1152 7700 bytes_read = -1;
1153 7700 scan_result = sscanf(line.c_str(), " %s%n", address, &bytes_read);
1154
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 7700 times.
 7700 assert(scan_result == 1);
1155
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 7700 times.
 7700 assert(bytes_read != -1);
1156 7700 str_offset += bytes_read;
1157
1158 // Next tokens are hostnames and aliases (we treat them as equal)
1159
2/2
✓ Branch 1 taken 23758 times.
✓ Branch 2 taken 7602 times.
 31360 while (str_offset < line.length()) {
1160 // check hostname length
1161 23758 int hostname_start_pos = -1, hostname_end_pos = -1;
1162 23758 scan_result = sscanf(line.c_str() + str_offset, " %n%*s%n",
1163 &hostname_start_pos, &hostname_end_pos);
1164
2/2
✓ Branch 0 taken 98 times.
✓ Branch 1 taken 23660 times.
 23758 if (scan_result == EOF)
1165 98 break;
1166
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 23660 times.
 23660 assert(hostname_start_pos != -1);
1167
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 23660 times.
 23660 assert(hostname_end_pos != -1);
1168
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 23660 times.
 23660 if (hostname_start_pos == hostname_end_pos)
1169 ✗ break;
1170
1171
2/2
✓ Branch 0 taken 28 times.
✓ Branch 1 taken 23632 times.
 23660 if (hostname_end_pos - hostname_start_pos > kHostnameMaxLength) {
1172
1/2
✓ Branch 2 taken 28 times.
✗ Branch 3 not taken.
 28 LogCvmfs(
1173 kLogDns, kLogSyslogWarn,
1174 "Skipping invalid (too long) hostname in hosts file on line: %s",
1175 line.c_str());
1176 28 str_offset += hostname_end_pos;
1177 28 continue;
1178 }
1179
1180 23632 bytes_read = -1;
1181 23632 scan_result = sscanf(line.c_str() + str_offset, " %s%n", hostname,
1182 &bytes_read);
1183
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 23632 times.
 23632 assert(scan_result == 1);
1184
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 23632 times.
 23632 assert(bytes_read != -1);
1185 23632 str_offset += bytes_read;
1186
1187
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 23632 times.
 23632 if (hostname[strlen(hostname) - 1] == '.')
1188 ✗ hostname[strlen(hostname) - 1] = 0; // strip the last character
1189
1190
2/4
✓ Branch 2 taken 23632 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 23632 times.
✗ Branch 6 not taken.
 23632 const map<string, HostEntry>::iterator iter = host_map_.find(hostname);
1191
2/2
✓ Branch 2 taken 18970 times.
✓ Branch 3 taken 4662 times.
 23632 if (iter == host_map_.end()) {
1192 18970 HostEntry entry;
1193
4/6
✓ Branch 2 taken 18970 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 18970 times.
✗ Branch 6 not taken.
✓ Branch 9 taken 14350 times.
✓ Branch 10 taken 4620 times.
 18970 if (IsIpv4Address(address))
1194
2/4
✓ Branch 2 taken 14350 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 14350 times.
✗ Branch 6 not taken.
 14350 entry.ipv4_addresses.push_back(address);
1195
2/2
✓ Branch 1 taken 4592 times.
✓ Branch 2 taken 28 times.
 4620 else if (!ipv4_only())
1196
2/4
✓ Branch 2 taken 4592 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 4592 times.
✗ Branch 6 not taken.
 4592 entry.ipv6_addresses.push_back(address);
1197
3/6
✓ Branch 2 taken 18970 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 18970 times.
✗ Branch 6 not taken.
✓ Branch 8 taken 18970 times.
✗ Branch 9 not taken.
 18970 host_map_[hostname] = entry;
1198 18970 } else {
1199
4/6
✓ Branch 2 taken 4662 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 4662 times.
✗ Branch 6 not taken.
✓ Branch 9 taken 42 times.
✓ Branch 10 taken 4620 times.
 4662 if (IsIpv4Address(address))
1200
2/4
✓ Branch 3 taken 42 times.
✗ Branch 4 not taken.
✓ Branch 6 taken 42 times.
✗ Branch 7 not taken.
 42 iter->second.ipv4_addresses.push_back(address);
1201
2/2
✓ Branch 1 taken 4592 times.
✓ Branch 2 taken 28 times.
 4620 else if (!ipv4_only())
1202
2/4
✓ Branch 3 taken 4592 times.
✗ Branch 4 not taken.
✓ Branch 6 taken 4592 times.
✗ Branch 7 not taken.
 4592 iter->second.ipv6_addresses.push_back(address);
1203 }
1204 } // Current line
1205 } // Hosts file
1206 2660 }
1207
1208
1209 5282 bool HostfileResolver::SetSearchDomains(const vector<string> &domains) {
1210 5282 domains_ = domains;
1211 5282 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 5282 NormalResolver *NormalResolver::Create(const bool ipv4_only,
1229 const unsigned retries,
1230 const unsigned timeout_ms) {
1231 5282 CaresResolver *cares_resolver = CaresResolver::Create(ipv4_only, retries,
1232 timeout_ms);
1233
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 5282 times.
 5282 if (!cares_resolver)
1234 ✗ return NULL;
1235
2/4
✓ Branch 2 taken 5282 times.
✗ Branch 3 not taken.
✓ Branch 5 taken 5282 times.
✗ Branch 6 not taken.
 5282 HostfileResolver *hostfile_resolver = HostfileResolver::Create("", ipv4_only);
1236
2/2
✓ Branch 0 taken 14 times.
✓ Branch 1 taken 5268 times.
 5282 if (!hostfile_resolver) {
1237
1/2
✓ Branch 0 taken 14 times.
✗ Branch 1 not taken.
 14 delete cares_resolver;
1238 14 return NULL;
1239 }
1240 5268 const bool retval = hostfile_resolver->SetSearchDomains(
1241 cares_resolver->domains());
1242
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 5268 times.
 5268 assert(retval);
1243
1244 5268 NormalResolver *normal_resolver = new NormalResolver();
1245 5268 normal_resolver->cares_resolver_ = cares_resolver;
1246 5268 normal_resolver->hostfile_resolver_ = hostfile_resolver;
1247 5268 normal_resolver->domains_ = cares_resolver->domains();
1248 5268 normal_resolver->resolvers_ = cares_resolver->resolvers();
1249 5268 normal_resolver->retries_ = cares_resolver->retries();
1250 5268 normal_resolver->timeout_ms_ = cares_resolver->timeout_ms();
1251 5268 return normal_resolver;
1252 }
1253
1254
1255 /**
1256 * Makes only sense for the c-ares resolver.
1257 */
1258 14 bool NormalResolver::SetResolvers(const vector<string> &resolvers) {
1259 14 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 2240 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 2240 const unsigned num = names.size();
1306
1/2
✓ Branch 1 taken 2240 times.
✗ Branch 2 not taken.
 2240 hostfile_resolver_->DoResolve(names, skip, ipv4_addresses, ipv6_addresses,
1307 failures, ttls, fqdns);
1308
1/2
✓ Branch 1 taken 2240 times.
✗ Branch 2 not taken.
 2240 vector<bool> skip_cares = skip;
1309
2/2
✓ Branch 0 taken 2274 times.
✓ Branch 1 taken 2240 times.
 4514 for (unsigned i = 0; i < num; ++i) {
1310
2/2
✓ Branch 1 taken 2260 times.
✓ Branch 2 taken 14 times.
 2274 if ((*failures)[i] == kFailOk)
1311
1/2
✓ Branch 1 taken 2260 times.
✗ Branch 2 not taken.
 2260 skip_cares[i] = true;
1312 }
1313
1/2
✓ Branch 1 taken 2240 times.
✗ Branch 2 not taken.
 2240 cares_resolver_->DoResolve(names, skip_cares, ipv4_addresses, ipv6_addresses,
1314 failures, ttls, fqdns);
1315 2240 }
1316
1317
1318 5268 NormalResolver::NormalResolver()
1319 5268 : Resolver(false, 0, 0), cares_resolver_(NULL), hostfile_resolver_(NULL) { }
1320
1321
1322 21068 NormalResolver::~NormalResolver() {
1323
1/2
✓ Branch 0 taken 5267 times.
✗ Branch 1 not taken.
 10534 delete cares_resolver_;
1324
1/2
✓ Branch 0 taken 5267 times.
✗ Branch 1 not taken.
 10534 delete hostfile_resolver_;
1325 21068 }
1326
1327 } // namespace dns
1328