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Commit | Line | Data |
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12c86877 | 1 | /* |
12471842 PL |
2 | * This file is part of PowerDNS or dnsdist. |
3 | * Copyright -- PowerDNS.COM B.V. and its contributors | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * In addition, for the avoidance of any doubt, permission is granted to | |
10 | * link this program with OpenSSL and to (re)distribute the binaries | |
11 | * produced as the result of such linking. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
870a0fe4 AT |
22 | #ifdef HAVE_CONFIG_H |
23 | #include "config.h" | |
24 | #endif | |
12c86877 BH |
25 | #include "utility.hh" |
26 | #include <cstdio> | |
12c86877 BH |
27 | #include <cstdlib> |
28 | #include <sys/types.h> | |
12c86877 | 29 | #include <iostream> |
12c86877 BH |
30 | #include <string> |
31 | #include <errno.h> | |
b8e0f341 BH |
32 | #include <boost/tokenizer.hpp> |
33 | #include <boost/algorithm/string.hpp> | |
12c86877 | 34 | #include <algorithm> |
fa8fd4d2 | 35 | |
9c92ad4b | 36 | #include "dnsseckeeper.hh" |
12c86877 BH |
37 | #include "dns.hh" |
38 | #include "dnsbackend.hh" | |
ea892f70 | 39 | #include "ednsoptions.hh" |
5c409fa2 | 40 | #include "pdnsexception.hh" |
12c86877 BH |
41 | #include "dnspacket.hh" |
42 | #include "logger.hh" | |
43 | #include "arguments.hh" | |
b8e0f341 BH |
44 | #include "dnswriter.hh" |
45 | #include "dnsparser.hh" | |
7f7b8d55 | 46 | #include "dnsrecords.hh" |
9c92ad4b | 47 | #include "dnssecinfra.hh" |
20665beb | 48 | #include "base64.hh" |
af7d3ea6 | 49 | #include "ednssubnet.hh" |
7f9ac49b | 50 | #include "gss_context.hh" |
d2116c15 | 51 | #include "dns_random.hh" |
af7d3ea6 BH |
52 | |
53 | bool DNSPacket::s_doEDNSSubnetProcessing; | |
15668f6a | 54 | uint16_t DNSPacket::s_udpTruncationThreshold; |
f15149ab | 55 | |
27c0050c | 56 | DNSPacket::DNSPacket(bool isQuery) |
12c86877 BH |
57 | { |
58 | d_wrapped=false; | |
59 | d_compress=true; | |
e9dd48f9 | 60 | d_tcp=false; |
7f7b8d55 | 61 | d_wantsnsid=false; |
af7d3ea6 | 62 | d_haveednssubnet = false; |
9c92ad4b | 63 | d_dnssecOk=false; |
298fabc3 AT |
64 | d_ednsversion=0; |
65 | d_ednsrcode=0; | |
b8874063 AT |
66 | memset(&d, 0, sizeof(d)); |
67 | qclass = QClass::IN; | |
68 | d_tsig_algo = TSIG_MD5; | |
69 | d_havetsig = false; | |
70 | d_socket = -1; | |
71 | d_maxreplylen = 0; | |
b8874063 AT |
72 | d_tsigtimersonly = false; |
73 | d_haveednssection = false; | |
27c0050c | 74 | d_isQuery = isQuery; |
12c86877 BH |
75 | } |
76 | ||
78bcb858 | 77 | const string& DNSPacket::getString() |
b8e0f341 BH |
78 | { |
79 | if(!d_wrapped) | |
e02d0a59 | 80 | wrapup(); |
b8e0f341 | 81 | |
78bcb858 | 82 | return d_rawpacket; |
b8e0f341 BH |
83 | } |
84 | ||
b9b4da23 | 85 | ComboAddress DNSPacket::getRemote() const |
12c86877 | 86 | { |
b9b4da23 | 87 | return d_remote; |
12c86877 BH |
88 | } |
89 | ||
092f210a | 90 | uint16_t DNSPacket::getRemotePort() const |
288f4aa9 | 91 | { |
d06799d4 | 92 | return d_remote.sin4.sin_port; |
288f4aa9 | 93 | } |
12c86877 | 94 | |
12c86877 BH |
95 | DNSPacket::DNSPacket(const DNSPacket &orig) |
96 | { | |
e6a9dde5 | 97 | DLOG(g_log<<"DNSPacket copy constructor called!"<<endl); |
12c86877 | 98 | d_socket=orig.d_socket; |
d06799d4 | 99 | d_remote=orig.d_remote; |
12c86877 | 100 | d_dt=orig.d_dt; |
12c86877 | 101 | d_compress=orig.d_compress; |
f28307ad | 102 | d_tcp=orig.d_tcp; |
12c86877 BH |
103 | qtype=orig.qtype; |
104 | qclass=orig.qclass; | |
105 | qdomain=orig.qdomain; | |
3e8216c8 PD |
106 | qdomainwild=orig.qdomainwild; |
107 | qdomainzone=orig.qdomainzone; | |
657e9124 | 108 | d_maxreplylen = orig.d_maxreplylen; |
7f7b8d55 | 109 | d_wantsnsid = orig.d_wantsnsid; |
2b6f1436 | 110 | d_anyLocal = orig.d_anyLocal; |
af7d3ea6 BH |
111 | d_eso = orig.d_eso; |
112 | d_haveednssubnet = orig.d_haveednssubnet; | |
f20d5371 | 113 | d_haveednssection = orig.d_haveednssection; |
298fabc3 AT |
114 | d_ednsversion = orig.d_ednsversion; |
115 | d_ednsrcode = orig.d_ednsrcode; | |
9c92ad4b BH |
116 | d_dnssecOk = orig.d_dnssecOk; |
117 | d_rrs=orig.d_rrs; | |
78bcb858 BH |
118 | |
119 | d_tsigkeyname = orig.d_tsigkeyname; | |
120 | d_tsigprevious = orig.d_tsigprevious; | |
121 | d_tsigtimersonly = orig.d_tsigtimersonly; | |
122 | d_trc = orig.d_trc; | |
123 | d_tsigsecret = orig.d_tsigsecret; | |
779b8a25 | 124 | d_ednsRawPacketSizeLimit = orig.d_ednsRawPacketSizeLimit; |
6dc26cf0 | 125 | d_havetsig = orig.d_havetsig; |
12c86877 BH |
126 | d_wrapped=orig.d_wrapped; |
127 | ||
78bcb858 | 128 | d_rawpacket=orig.d_rawpacket; |
21711f60 | 129 | d_tsig_algo=orig.d_tsig_algo; |
12c86877 | 130 | d=orig.d; |
f6a81077 RG |
131 | |
132 | d_isQuery = orig.d_isQuery; | |
bf269e28 | 133 | d_hash = orig.d_hash; |
12c86877 BH |
134 | } |
135 | ||
12c86877 BH |
136 | void DNSPacket::setRcode(int v) |
137 | { | |
138 | d.rcode=v; | |
139 | } | |
140 | ||
141 | void DNSPacket::setAnswer(bool b) | |
142 | { | |
143 | if(b) { | |
78bcb858 | 144 | d_rawpacket.assign(12,(char)0); |
12c86877 BH |
145 | memset((void *)&d,0,sizeof(d)); |
146 | ||
147 | d.qr=b; | |
148 | } | |
149 | } | |
150 | ||
151 | void DNSPacket::setA(bool b) | |
152 | { | |
153 | d.aa=b; | |
154 | } | |
155 | ||
092f210a | 156 | void DNSPacket::setID(uint16_t id) |
12c86877 BH |
157 | { |
158 | d.id=id; | |
159 | } | |
160 | ||
161 | void DNSPacket::setRA(bool b) | |
162 | { | |
163 | d.ra=b; | |
164 | } | |
165 | ||
166 | void DNSPacket::setRD(bool b) | |
167 | { | |
168 | d.rd=b; | |
169 | } | |
170 | ||
092f210a | 171 | void DNSPacket::setOpcode(uint16_t opcode) |
12c86877 BH |
172 | { |
173 | d.opcode=opcode; | |
174 | } | |
175 | ||
12c86877 | 176 | |
77235722 BH |
177 | void DNSPacket::clearRecords() |
178 | { | |
9c92ad4b | 179 | d_rrs.clear(); |
77235722 BH |
180 | } |
181 | ||
90ba52e0 | 182 | void DNSPacket::addRecord(const DNSZoneRecord &rr) |
12c86877 | 183 | { |
2e7834cb BH |
184 | // this removes duplicates from the packet in case we are not compressing |
185 | // for AXFR, no such checking is performed! | |
66ddf73d | 186 | // cerr<<"addrecord, content=["<<rr.content<<"]"<<endl; |
3d00ef90 | 187 | if(d_compress) { |
90ba52e0 | 188 | for(auto i=d_rrs.begin();i!=d_rrs.end();++i) { |
3d00ef90 | 189 | if(rr.dr == i->dr) // XXX SUPER SLOW |
4957a608 | 190 | return; |
90ba52e0 | 191 | } |
192 | } | |
193 | ||
66ddf73d | 194 | // cerr<<"added to d_rrs"<<endl; |
9c92ad4b | 195 | d_rrs.push_back(rr); |
12c86877 BH |
196 | } |
197 | ||
12c86877 | 198 | |
12c86877 | 199 | |
90ba52e0 | 200 | vector<DNSZoneRecord*> DNSPacket::getAPRecords() |
12c86877 | 201 | { |
90ba52e0 | 202 | vector<DNSZoneRecord*> arrs; |
12c86877 | 203 | |
90ba52e0 | 204 | for(vector<DNSZoneRecord>::iterator i=d_rrs.begin(); |
9c92ad4b | 205 | i!=d_rrs.end(); |
12c86877 BH |
206 | ++i) |
207 | { | |
90ba52e0 | 208 | if(i->dr.d_place!=DNSResourceRecord::ADDITIONAL && |
209 | (i->dr.d_type==QType::MX || | |
210 | i->dr.d_type==QType::NS || | |
211 | i->dr.d_type==QType::SRV)) | |
4957a608 BH |
212 | { |
213 | arrs.push_back(&*i); | |
214 | } | |
12c86877 BH |
215 | } |
216 | ||
217 | return arrs; | |
218 | ||
219 | } | |
220 | ||
90ba52e0 | 221 | vector<DNSZoneRecord*> DNSPacket::getAnswerRecords() |
9c92ad4b | 222 | { |
90ba52e0 | 223 | vector<DNSZoneRecord*> arrs; |
9c92ad4b | 224 | |
90ba52e0 | 225 | for(vector<DNSZoneRecord>::iterator i=d_rrs.begin(); |
9c92ad4b BH |
226 | i!=d_rrs.end(); |
227 | ++i) | |
228 | { | |
90ba52e0 | 229 | if(i->dr.d_place!=DNSResourceRecord::ADDITIONAL) |
232f0877 | 230 | arrs.push_back(&*i); |
9c92ad4b BH |
231 | } |
232 | return arrs; | |
233 | } | |
234 | ||
235 | ||
12c86877 BH |
236 | void DNSPacket::setCompress(bool compress) |
237 | { | |
238 | d_compress=compress; | |
78bcb858 | 239 | d_rawpacket.reserve(65000); |
9c92ad4b | 240 | d_rrs.reserve(200); |
12c86877 BH |
241 | } |
242 | ||
7f7b8d55 BH |
243 | bool DNSPacket::couldBeCached() |
244 | { | |
ea892f70 | 245 | return !d_wantsnsid && qclass==QClass::IN && !d_havetsig; |
7f7b8d55 | 246 | } |
20665beb | 247 | |
b35ea8ec PD |
248 | unsigned int DNSPacket::getMinTTL() |
249 | { | |
250 | unsigned int minttl = UINT_MAX; | |
90ba52e0 | 251 | for(const DNSZoneRecord& rr : d_rrs) { |
252 | if (rr.dr.d_ttl < minttl) | |
253 | minttl = rr.dr.d_ttl; | |
b35ea8ec PD |
254 | } |
255 | ||
256 | return minttl; | |
257 | } | |
258 | ||
9951e2d0 KM |
259 | bool DNSPacket::isEmpty() |
260 | { | |
261 | return (d_rrs.empty()); | |
262 | } | |
263 | ||
12c86877 BH |
264 | /** Must be called before attempting to access getData(). This function stuffs all resource |
265 | * records found in rrs into the data buffer. It also frees resource records queued for us. | |
266 | */ | |
e02d0a59 | 267 | void DNSPacket::wrapup() |
12c86877 BH |
268 | { |
269 | if(d_wrapped) { | |
270 | return; | |
271 | } | |
51a3a4d4 | 272 | |
90ba52e0 | 273 | DNSZoneRecord rr; |
274 | vector<DNSZoneRecord>::iterator pos; | |
12c86877 | 275 | |
12c86877 BH |
276 | // we now need to order rrs so that the different sections come at the right place |
277 | // we want a stable sort, based on the d_place field | |
278 | ||
90ba52e0 | 279 | stable_sort(d_rrs.begin(),d_rrs.end(), [](const DNSZoneRecord& a, const DNSZoneRecord& b) { |
280 | return a.dr.d_place < b.dr.d_place; | |
281 | }); | |
4c5d6da9 | 282 | static bool mustNotShuffle = ::arg().mustDo("no-shuffle"); |
da73ef3c | 283 | |
4c5d6da9 | 284 | if(!d_tcp && !mustNotShuffle) { |
9c92ad4b | 285 | shuffle(d_rrs); |
ff6a1e7b | 286 | } |
12c86877 BH |
287 | d_wrapped=true; |
288 | ||
b8e0f341 | 289 | vector<uint8_t> packet; |
adf13442 | 290 | DNSPacketWriter pw(packet, qdomain, qtype.getCode(), qclass); |
12c86877 | 291 | |
6f966e0b | 292 | pw.getHeader()->rcode=d.rcode; |
da22f3df | 293 | pw.getHeader()->opcode = d.opcode; |
b8e0f341 BH |
294 | pw.getHeader()->aa=d.aa; |
295 | pw.getHeader()->ra=d.ra; | |
296 | pw.getHeader()->qr=d.qr; | |
297 | pw.getHeader()->id=d.id; | |
298 | pw.getHeader()->rd=d.rd; | |
abc8f3f9 | 299 | pw.getHeader()->tc=d.tc; |
300 | ||
7f7b8d55 BH |
301 | DNSPacketWriter::optvect_t opts; |
302 | if(d_wantsnsid) { | |
8ca1a435 | 303 | const static string mode_server_id=::arg()["server-id"]; |
49e8d5d5 | 304 | if(mode_server_id != "disabled") { |
8ca1a435 DB |
305 | opts.push_back(make_pair(3, mode_server_id)); |
306 | } | |
7f7b8d55 BH |
307 | } |
308 | ||
f20d5371 | 309 | if(!d_rrs.empty() || !opts.empty() || d_haveednssubnet || d_haveednssection) { |
6f966e0b | 310 | try { |
af7d3ea6 | 311 | uint8_t maxScopeMask=0; |
9c92ad4b | 312 | for(pos=d_rrs.begin(); pos < d_rrs.end(); ++pos) { |
66ddf73d | 313 | // cerr<<"during wrapup, content=["<<pos->content<<"]"<<endl; |
af7d3ea6 | 314 | maxScopeMask = max(maxScopeMask, pos->scopeMask); |
e02d0a59 | 315 | |
90ba52e0 | 316 | pw.startRecord(pos->dr.d_name, pos->dr.d_type, pos->dr.d_ttl, pos->dr.d_class, pos->dr.d_place); |
317 | pos->dr.d_content->toPacket(pw); | |
dffbaa08 | 318 | if(pw.size() + 20U > (d_tcp ? 65535 : getMaxReplyLen())) { // 20 = room for EDNS0 |
95369951 | 319 | pw.rollback(); |
90ba52e0 | 320 | if(pos->dr.d_place == DNSResourceRecord::ANSWER || pos->dr.d_place == DNSResourceRecord::AUTHORITY) { |
95369951 BH |
321 | pw.getHeader()->tc=1; |
322 | } | |
96b59a50 | 323 | goto noCommit; |
95369951 BH |
324 | } |
325 | } | |
732b7143 PD |
326 | |
327 | // if(!pw.getHeader()->tc) // protect against double commit from addSignature | |
328 | ||
329 | if(!d_rrs.empty()) pw.commit(); | |
96b59a50 | 330 | |
732b7143 | 331 | noCommit:; |
af7d3ea6 BH |
332 | |
333 | if(d_haveednssubnet) { | |
334 | string makeEDNSSubnetOptsString(const EDNSSubnetOpts& eso); | |
335 | EDNSSubnetOpts eso = d_eso; | |
336 | eso.scope = Netmask(eso.source.getNetwork(), maxScopeMask); | |
337 | ||
338 | string opt = makeEDNSSubnetOptsString(eso); | |
48981c2e | 339 | opts.push_back(make_pair(8, opt)); // 'EDNS SUBNET' |
af7d3ea6 | 340 | } |
9c92ad4b | 341 | |
f20d5371 | 342 | if(!opts.empty() || d_haveednssection || d_dnssecOk) |
75fc7cbc | 343 | { |
298fabc3 | 344 | pw.addOpt(s_udpTruncationThreshold, d_ednsrcode, d_dnssecOk ? EDNSOpts::DNSSECOK : 0, opts); |
95369951 | 345 | pw.commit(); |
75fc7cbc | 346 | } |
6f966e0b | 347 | } |
5172cb78 | 348 | catch(std::exception& e) { |
e6a9dde5 | 349 | g_log<<Logger::Warning<<"Exception: "<<e.what()<<endl; |
6f966e0b | 350 | throw; |
12c86877 | 351 | } |
b8e0f341 | 352 | } |
78bcb858 | 353 | |
4a51ff72 | 354 | if(d_trc.d_algoName.countLabels()) |
ea3816cf | 355 | addTSIG(pw, d_trc, d_tsigkeyname, d_tsigsecret, d_tsigprevious, d_tsigtimersonly); |
78bcb858 | 356 | |
90ba52e0 | 357 | d_rawpacket.assign((char*)&packet[0], packet.size()); // XXX we could do this natively on a vector.. |
3e8216c8 | 358 | |
da286f66 | 359 | // copy RR counts so they can be read later |
3e8216c8 PD |
360 | d.qdcount = pw.getHeader()->qdcount; |
361 | d.ancount = pw.getHeader()->ancount; | |
362 | d.nscount = pw.getHeader()->nscount; | |
363 | d.arcount = pw.getHeader()->arcount; | |
12c86877 BH |
364 | } |
365 | ||
c2f3be9d | 366 | void DNSPacket::setQuestion(int op, const DNSName &qd, int newqtype) |
12c86877 BH |
367 | { |
368 | memset(&d,0,sizeof(d)); | |
d2116c15 | 369 | d.id=dns_random(0xffff); |
12c86877 BH |
370 | d.rd=d.tc=d.aa=false; |
371 | d.qr=false; | |
372 | d.qdcount=1; // is htons'ed later on | |
373 | d.ancount=d.arcount=d.nscount=0; | |
374 | d.opcode=op; | |
288f4aa9 BH |
375 | qdomain=qd; |
376 | qtype=newqtype; | |
12c86877 BH |
377 | } |
378 | ||
12c86877 BH |
379 | /** convenience function for creating a reply packet from a question packet. Do not forget to delete it after use! */ |
380 | DNSPacket *DNSPacket::replyPacket() const | |
381 | { | |
27c0050c | 382 | DNSPacket *r=new DNSPacket(false); |
12c86877 | 383 | r->setSocket(d_socket); |
2b6f1436 | 384 | r->d_anyLocal=d_anyLocal; |
d06799d4 | 385 | r->setRemote(&d_remote); |
12c86877 BH |
386 | r->setAnswer(true); // this implies the allocation of the header |
387 | r->setA(true); // and we are authoritative | |
388 | r->setRA(0); // no recursion available | |
78bcb858 | 389 | r->setRD(d.rd); // if you wanted to recurse, answer will say you wanted it |
12c86877 BH |
390 | r->setID(d.id); |
391 | r->setOpcode(d.opcode); | |
392 | ||
12c86877 | 393 | r->d_dt=d_dt; |
092c9cc4 | 394 | r->d.qdcount=1; |
f28307ad | 395 | r->d_tcp = d_tcp; |
b8e0f341 BH |
396 | r->qdomain = qdomain; |
397 | r->qtype = qtype; | |
adf13442 | 398 | r->qclass = qclass; |
657e9124 | 399 | r->d_maxreplylen = d_maxreplylen; |
7f7b8d55 | 400 | r->d_wantsnsid = d_wantsnsid; |
9c92ad4b | 401 | r->d_dnssecOk = d_dnssecOk; |
af7d3ea6 BH |
402 | r->d_eso = d_eso; |
403 | r->d_haveednssubnet = d_haveednssubnet; | |
f20d5371 | 404 | r->d_haveednssection = d_haveednssection; |
298fabc3 AT |
405 | r->d_ednsversion = 0; |
406 | r->d_ednsrcode = 0; | |
407 | ||
675fa24c | 408 | if(d_tsigkeyname.countLabels()) { |
78bcb858 BH |
409 | r->d_tsigkeyname = d_tsigkeyname; |
410 | r->d_tsigprevious = d_tsigprevious; | |
411 | r->d_trc = d_trc; | |
412 | r->d_tsigsecret = d_tsigsecret; | |
413 | r->d_tsigtimersonly = d_tsigtimersonly; | |
414 | } | |
6dc26cf0 | 415 | r->d_havetsig = d_havetsig; |
12c86877 BH |
416 | return r; |
417 | } | |
418 | ||
63e365db | 419 | void DNSPacket::spoofQuestion(const DNSPacket *qd) |
12c86877 | 420 | { |
b8e0f341 | 421 | d_wrapped=true; // if we do this, don't later on wrapup |
7de6b0d5 | 422 | |
63e365db PD |
423 | int labellen; |
424 | string::size_type i=sizeof(d); | |
425 | ||
426 | for(;;) { | |
427 | labellen = qd->d_rawpacket[i]; | |
428 | if(!labellen) break; | |
429 | i++; | |
430 | d_rawpacket.replace(i, labellen, qd->d_rawpacket, i, labellen); | |
431 | i = i + labellen; | |
7de6b0d5 | 432 | } |
b8e0f341 | 433 | } |
12c86877 | 434 | |
a683e8bd | 435 | int DNSPacket::noparse(const char *mesg, size_t length) |
07676510 | 436 | { |
78bcb858 | 437 | d_rawpacket.assign(mesg,length); |
07676510 | 438 | if(length < 12) { |
e6a9dde5 | 439 | g_log << Logger::Debug << "Ignoring packet: too short ("<<length<<" < 12) from " |
d06e6c8b | 440 | << d_remote.toStringWithPort()<< endl; |
07676510 BH |
441 | return -1; |
442 | } | |
443 | d_wantsnsid=false; | |
07676510 | 444 | d_maxreplylen=512; |
78bcb858 | 445 | memcpy((void *)&d,(const void *)d_rawpacket.c_str(),12); |
07676510 BH |
446 | return 0; |
447 | } | |
448 | ||
675fa24c | 449 | void DNSPacket::setTSIGDetails(const TSIGRecordContent& tr, const DNSName& keyname, const string& secret, const string& previous, bool timersonly) |
78bcb858 BH |
450 | { |
451 | d_trc=tr; | |
e49d0a2f | 452 | d_trc.d_origID = (((d.id & 0xFF)<<8) | ((d.id & 0xFF00)>>8)); |
78bcb858 BH |
453 | d_tsigkeyname = keyname; |
454 | d_tsigsecret = secret; | |
455 | d_tsigprevious = previous; | |
456 | d_tsigtimersonly=timersonly; | |
457 | } | |
458 | ||
ea3816cf | 459 | bool DNSPacket::getTSIGDetails(TSIGRecordContent* trc, DNSName* keyname, uint16_t* tsigPosOut) const |
78bcb858 | 460 | { |
27c0050c | 461 | MOADNSParser mdp(d_isQuery, d_rawpacket); |
ea3816cf RG |
462 | uint16_t tsigPos = mdp.getTSIGPos(); |
463 | if(!tsigPos) | |
78bcb858 BH |
464 | return false; |
465 | ||
466 | bool gotit=false; | |
467 | for(MOADNSParser::answers_t::const_iterator i=mdp.d_answers.begin(); i!=mdp.d_answers.end(); ++i) { | |
60a1c204 | 468 | if(i->first.d_type == QType::TSIG && i->first.d_class == QType::ANY) { |
6b3e413d CH |
469 | // cast can fail, f.e. if d_content is an UnknownRecordContent. |
470 | shared_ptr<TSIGRecordContent> content = std::dynamic_pointer_cast<TSIGRecordContent>(i->first.d_content); | |
471 | if (!content) { | |
e6a9dde5 | 472 | g_log<<Logger::Error<<"TSIG record has no or invalid content (invalid packet)"<<endl; |
6b3e413d CH |
473 | return false; |
474 | } | |
475 | *trc = *content; | |
f809c028 | 476 | *keyname = i->first.d_name; |
6b3e413d | 477 | gotit=true; |
78bcb858 BH |
478 | } |
479 | } | |
480 | if(!gotit) | |
481 | return false; | |
ea3816cf RG |
482 | |
483 | if (tsigPosOut) { | |
484 | *tsigPosOut = tsigPos; | |
485 | } | |
78bcb858 | 486 | |
78bcb858 BH |
487 | return true; |
488 | } | |
489 | ||
675fa24c | 490 | bool DNSPacket::getTKEYRecord(TKEYRecordContent *tr, DNSName *keyname) const |
4429ed62 | 491 | { |
27c0050c | 492 | MOADNSParser mdp(d_isQuery, d_rawpacket); |
4429ed62 AT |
493 | bool gotit=false; |
494 | ||
495 | for(MOADNSParser::answers_t::const_iterator i=mdp.d_answers.begin(); i!=mdp.d_answers.end(); ++i) { | |
496 | if (gotit) { | |
e6a9dde5 | 497 | g_log<<Logger::Error<<"More than one TKEY record found in query"<<endl; |
4429ed62 AT |
498 | return false; |
499 | } | |
500 | ||
501 | if(i->first.d_type == QType::TKEY) { | |
6b3e413d CH |
502 | // cast can fail, f.e. if d_content is an UnknownRecordContent. |
503 | shared_ptr<TKEYRecordContent> content = std::dynamic_pointer_cast<TKEYRecordContent>(i->first.d_content); | |
504 | if (!content) { | |
e6a9dde5 | 505 | g_log<<Logger::Error<<"TKEY record has no or invalid content (invalid packet)"<<endl; |
6b3e413d CH |
506 | return false; |
507 | } | |
508 | *tr = *content; | |
f809c028 | 509 | *keyname = i->first.d_name; |
4429ed62 AT |
510 | gotit=true; |
511 | } | |
512 | } | |
513 | ||
514 | return gotit; | |
515 | } | |
516 | ||
b8e0f341 BH |
517 | /** This function takes data from the network, possibly received with recvfrom, and parses |
518 | it into our class. Results of calling this function multiple times on one packet are | |
519 | unknown. Returns -1 if the packet cannot be parsed. | |
520 | */ | |
a683e8bd | 521 | int DNSPacket::parse(const char *mesg, size_t length) |
9f064e90 | 522 | try |
b8e0f341 | 523 | { |
78bcb858 | 524 | d_rawpacket.assign(mesg,length); |
0e7f49b5 | 525 | d_wrapped=true; |
b8e0f341 | 526 | if(length < 12) { |
e6a9dde5 | 527 | g_log << Logger::Warning << "Ignoring packet: too short from " |
b8e0f341 BH |
528 | << getRemote() << endl; |
529 | return -1; | |
530 | } | |
7f7b8d55 | 531 | |
27c0050c | 532 | MOADNSParser mdp(d_isQuery, d_rawpacket); |
7f7b8d55 BH |
533 | EDNSOpts edo; |
534 | ||
535 | // ANY OPTION WHICH *MIGHT* BE SET DOWN BELOW SHOULD BE CLEARED FIRST! | |
536 | ||
537 | d_wantsnsid=false; | |
9c92ad4b | 538 | d_dnssecOk=false; |
78bcb858 | 539 | d_havetsig = mdp.getTSIGPos(); |
af7d3ea6 | 540 | d_haveednssubnet = false; |
f20d5371 | 541 | d_haveednssection = false; |
9c92ad4b | 542 | |
7f7b8d55 | 543 | if(getEDNSOpts(mdp, &edo)) { |
f20d5371 | 544 | d_haveednssection=true; |
7a9b7c95 RG |
545 | /* rfc6891 6.2.3: |
546 | "Values lower than 512 MUST be treated as equal to 512." | |
547 | */ | |
779b8a25 | 548 | d_ednsRawPacketSizeLimit=edo.d_packetsize; |
7a9b7c95 | 549 | d_maxreplylen=std::min(std::max(static_cast<uint16_t>(512), edo.d_packetsize), s_udpTruncationThreshold); |
d28f1bd6 | 550 | // cerr<<edo.d_Z<<endl; |
9c92ad4b BH |
551 | if(edo.d_Z & EDNSOpts::DNSSECOK) |
552 | d_dnssecOk=true; | |
7f7b8d55 BH |
553 | |
554 | for(vector<pair<uint16_t, string> >::const_iterator iter = edo.d_options.begin(); | |
4957a608 BH |
555 | iter != edo.d_options.end(); |
556 | ++iter) { | |
ea892f70 CH |
557 | if(iter->first == EDNSOptionCode::NSID) { |
558 | d_wantsnsid=true; | |
7f7b8d55 | 559 | } |
ea892f70 | 560 | else if(s_doEDNSSubnetProcessing && (iter->first == EDNSOptionCode::ECS)) { // 'EDNS SUBNET' |
17d6efc0 | 561 | if(getEDNSSubnetOptsFromString(iter->second, &d_eso)) { |
af7d3ea6 BH |
562 | //cerr<<"Parsed, source: "<<d_eso.source.toString()<<", scope: "<<d_eso.scope.toString()<<", family = "<<d_eso.scope.getNetwork().sin4.sin_family<<endl; |
563 | d_haveednssubnet=true; | |
564 | } | |
565 | } | |
566 | else { | |
567 | // cerr<<"Have an option #"<<iter->first<<": "<<makeHexDump(iter->second)<<endl; | |
568 | } | |
7f7b8d55 | 569 | } |
298fabc3 AT |
570 | d_ednsversion = edo.d_version; |
571 | d_ednsrcode = edo.d_extRCode; | |
779b8a25 | 572 | } |
7f7b8d55 | 573 | else { |
657e9124 | 574 | d_maxreplylen=512; |
779b8a25 | 575 | d_ednsRawPacketSizeLimit=-1; |
7f7b8d55 | 576 | } |
12c86877 | 577 | |
78bcb858 | 578 | memcpy((void *)&d,(const void *)d_rawpacket.c_str(),12); |
b8e0f341 | 579 | qdomain=mdp.d_qname; |
c2f3be9d PD |
580 | // if(!qdomain.empty()) // strip dot |
581 | // boost::erase_tail(qdomain, 1); | |
12c86877 | 582 | |
b8e0f341 BH |
583 | if(!ntohs(d.qdcount)) { |
584 | if(!d_tcp) { | |
e6a9dde5 | 585 | g_log << Logger::Warning << "No question section in packet from " << getRemote() <<", error="<<RCode::to_s(d.rcode)<<endl; |
b8e0f341 | 586 | return -1; |
12c86877 BH |
587 | } |
588 | } | |
589 | ||
b8e0f341 BH |
590 | qtype=mdp.d_qtype; |
591 | qclass=mdp.d_qclass; | |
592 | return 0; | |
12c86877 | 593 | } |
5172cb78 | 594 | catch(std::exception& e) { |
9f064e90 BH |
595 | return -1; |
596 | } | |
12c86877 | 597 | |
78bcb858 | 598 | unsigned int DNSPacket::getMaxReplyLen() |
657e9124 BH |
599 | { |
600 | return d_maxreplylen; | |
601 | } | |
602 | ||
80397312 BH |
603 | void DNSPacket::setMaxReplyLen(int bytes) |
604 | { | |
605 | d_maxreplylen=bytes; | |
606 | } | |
607 | ||
b8e0f341 BH |
608 | //! Use this to set where this packet was received from or should be sent to |
609 | void DNSPacket::setRemote(const ComboAddress *s) | |
12c86877 | 610 | { |
d06799d4 | 611 | d_remote=*s; |
b8e0f341 | 612 | } |
12c86877 | 613 | |
fe498ace BH |
614 | bool DNSPacket::hasEDNSSubnet() |
615 | { | |
616 | return d_haveednssubnet; | |
617 | } | |
618 | ||
17d0b1e6 PD |
619 | bool DNSPacket::hasEDNS() |
620 | { | |
621 | return d_haveednssection; | |
622 | } | |
623 | ||
af7d3ea6 BH |
624 | Netmask DNSPacket::getRealRemote() const |
625 | { | |
626 | if(d_haveednssubnet) | |
627 | return d_eso.source; | |
628 | return Netmask(d_remote); | |
629 | } | |
630 | ||
b8e0f341 | 631 | void DNSPacket::setSocket(Utility::sock_t sock) |
12c86877 | 632 | { |
b8e0f341 | 633 | d_socket=sock; |
12c86877 BH |
634 | } |
635 | ||
b8e0f341 | 636 | void DNSPacket::commitD() |
12c86877 | 637 | { |
78bcb858 | 638 | d_rawpacket.replace(0,12,(char *)&d,12); // copy in d |
12c86877 BH |
639 | } |
640 | ||
ea3816cf | 641 | bool DNSPacket::checkForCorrectTSIG(UeberBackend* B, DNSName* keyname, string* secret, TSIGRecordContent* trc) const |
78bcb858 | 642 | { |
ea3816cf | 643 | uint16_t tsigPos; |
60a1c204 | 644 | |
ea3816cf | 645 | if (!this->getTSIGDetails(trc, keyname, &tsigPos)) { |
78bcb858 BH |
646 | return false; |
647 | } | |
785594c9 | 648 | |
ea3816cf RG |
649 | TSIGTriplet tt; |
650 | tt.name = *keyname; | |
651 | tt.algo = trc->d_algoName; | |
652 | if (tt.algo == DNSName("hmac-md5.sig-alg.reg.int")) | |
653 | tt.algo = DNSName("hmac-md5"); | |
9a459f10 | 654 | |
ea3816cf RG |
655 | string secret64; |
656 | if (tt.algo != DNSName("gss-tsig")) { | |
657 | if(!B->getTSIGKey(*keyname, &tt.algo, &secret64)) { | |
e6a9dde5 | 658 | g_log<<Logger::Error<<"Packet for domain '"<<this->qdomain<<"' denied: can't find TSIG key with name '"<<*keyname<<"' and algorithm '"<<tt.algo<<"'"<<endl; |
7f9ac49b AT |
659 | return false; |
660 | } | |
ea3816cf RG |
661 | B64Decode(secret64, *secret); |
662 | tt.secret = *secret; | |
7f9ac49b AT |
663 | } |
664 | ||
ea3816cf | 665 | bool result; |
3213be1e | 666 | |
ea3816cf RG |
667 | try { |
668 | result = validateTSIG(d_rawpacket, tsigPos, tt, *trc, "", trc->d_mac, false); | |
9f782f99 | 669 | } |
ea3816cf | 670 | catch(const std::runtime_error& err) { |
e6a9dde5 | 671 | g_log<<Logger::Error<<"Packet for '"<<this->qdomain<<"' denied: "<<err.what()<<endl; |
ea3816cf | 672 | return false; |
78bcb858 | 673 | } |
785594c9 | 674 | |
78bcb858 BH |
675 | return result; |
676 | } | |
1a5ac5d7 | 677 | |
6fe866b4 | 678 | const DNSName& DNSPacket::getTSIGKeyname() const { |
1a5ac5d7 AT |
679 | return d_tsigkeyname; |
680 | } |