19176325108

Committed 07 Nov 2025 05:36PM UTC coverage: 73.012% (+0.02%) from 72.995%

Build # 19176325108

Build Type

Pull #16452

github

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web-flow

Commit Message

Merge 380c7d67a into f324028a2

Pull Request Pull Request #16452: dnsdist: evil code which will hurt your eyesight

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60.79

/modules/pipebackend/pipebackend.cc

/*
 * This file is part of PowerDNS or dnsdist.
 * Copyright -- PowerDNS.COM B.V. and its contributors
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * In addition, for the avoidance of any doubt, permission is granted to
 * link this program with OpenSSL and to (re)distribute the binaries
 * produced as the result of such linking.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string>
#include <map>
#include <unistd.h>
#include <stdlib.h>
#include <sstream>
#include "coprocess.hh"

#include "pdns/namespaces.hh"

#include "pdns/dns.hh"
#include "pdns/dnsbackend.hh"
#include "pdns/dnspacket.hh"
#include "pdns/pdnsexception.hh"
#include "pdns/logger.hh"
#include "pdns/arguments.hh"
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "pipebackend.hh"

// The following requirement guarantees UnknownDomainID will get output as "-1"
// for compatibility.
static_assert(std::is_signed<domainid_t>::value);

static const char* kBackendId = "[PIPEBackend]";

CoWrapper::CoWrapper(const string& command, int timeout, int abiVersion)
{
  d_command = command;
  d_timeout = timeout;
  d_abiVersion = abiVersion;
  launch(); // let exceptions fall through - if initial launch fails, we want to die
  // I think
}

CoWrapper::~CoWrapper() = default;

void CoWrapper::launch()
{
  if (d_cp)
    return;

  if (d_command.empty())
    throw ArgException("pipe-command is not specified");

  if (isUnixSocket(d_command)) {
    d_cp = std::make_unique<UnixRemote>(d_command);
  }
  else {
    auto coprocess = std::make_unique<CoProcess>(d_command, d_timeout);
    coprocess->launch();
    d_cp = std::move(coprocess);
  }

  d_cp->send("HELO\t" + std::to_string(d_abiVersion));
  string banner;
  d_cp->receive(banner);
  g_log << Logger::Error << "Backend launched with banner: " << banner << endl;
}

void CoWrapper::send(const string& line)
{
  launch();
  try {
    d_cp->send(line);
    return;
  }
  catch (PDNSException& ae) {
    d_cp.reset();
    throw;
  }
}
void CoWrapper::receive(string& line)
{
  launch();
  try {
    d_cp->receive(line);
    return;
  }
  catch (PDNSException& ae) {
    g_log << Logger::Warning << kBackendId << " Unable to receive data from coprocess. " << ae.reason << endl;
    d_cp.reset();
    throw;
  }
}

PipeBackend::PipeBackend(const string& suffix)
{
  d_disavow = false;
  setArgPrefix("pipe" + suffix);
  try {
    launch();
  }
  catch (const ArgException& A) {
    g_log << Logger::Error << kBackendId << " Unable to launch, fatal argument error: " << A.reason << endl;
    throw;
  }
  catch (...) {
    throw;
  }
}

void PipeBackend::launch()
{
  if (d_coproc)
    return;

  try {
    if (!getArg("regex").empty()) {
      d_regex = std::make_unique<Regex>(getArg("regex"));
    }
    d_regexstr = getArg("regex");
    d_abiVersion = getArgAsNum("abi-version");
    d_coproc = std::make_unique<CoWrapper>(getArg("command"), getArgAsNum("timeout"), getArgAsNum("abi-version"));
  }

  catch (const ArgException& A) {
    cleanup();
    throw;
  }
}

/*
 * Cleans up the co-process wrapper
 */
void PipeBackend::cleanup()
{
  d_coproc.reset(nullptr);
  d_regex.reset();
  d_regexstr = string();
  d_abiVersion = 0;
}

void PipeBackend::lookup(const QType& qtype, const DNSName& qname, domainid_t zoneId, DNSPacket* pkt_p)
{
  try {
    launch();
    d_disavow = false;
    if (d_regex && !d_regex->match(qname.toStringRootDot())) {
      if (::arg().mustDo("query-logging"))
        g_log << Logger::Error << "Query for '" << qname << "' failed regex '" << d_regexstr << "'" << endl;
      d_disavow = true; // don't pass to backend
    }
    else {
      ostringstream query;
      string localIP = "0.0.0.0";
      string remoteIP = "0.0.0.0";
      Netmask realRemote("0.0.0.0/0");
      if (pkt_p) {
        localIP = pkt_p->getLocal().toString();
        realRemote = pkt_p->getRealRemote();
        remoteIP = pkt_p->getInnerRemote().toString();
      }
      // abi-version = 1
      // type    qname           qclass  qtype   id      remote-ip-address
      query << "Q\t" << qname.toStringRootDot() << "\tIN\t" << qtype.toString() << "\t" << zoneId << "\t" << remoteIP;

      // add the local-ip-address if abi-version is set to 2
      if (d_abiVersion >= 2)
        query << "\t" << localIP;
      if (d_abiVersion >= 3)
        query << "\t" << realRemote.toString();

      if (::arg().mustDo("query-logging"))
        g_log << Logger::Error << "Query: '" << query.str() << "'" << endl;
      d_coproc->send(query.str());
    }
  }
  catch (PDNSException& pe) {
    g_log << Logger::Error << kBackendId << " Error from coprocess: " << pe.reason << endl;
    d_disavow = true;
  }
  d_qtype = qtype;
  d_qname = qname;
}

bool PipeBackend::list(const ZoneName& target, domainid_t domain_id, bool /* include_disabled */)
{
  try {
    launch();
    d_disavow = false;
    ostringstream query;
    // The question format:

    // type    qname           qclass  qtype   id      ip-address
    if (d_abiVersion >= 4)
      query << "AXFR\t" << domain_id << "\t" << target.toStringRootDot();
    else
      query << "AXFR\t" << domain_id;

    d_coproc->send(query.str());
  }
  catch (PDNSException& ae) {
    g_log << Logger::Error << kBackendId << " Error from coprocess: " << ae.reason << endl;
  }
  d_qname = DNSName(std::to_string(domain_id)); // why do we store a number here??
  return true;
}

string PipeBackend::directBackendCmd(const string& query)
{
  if (d_abiVersion < 5)
    return "not supported on ABI version " + std::to_string(d_abiVersion) + " (use ABI version 5 or later)\n";

  try {
    launch();
    ostringstream oss;
    oss << "CMD\t" << query;
    d_coproc->send(oss.str());
  }
  catch (PDNSException& ae) {
    g_log << Logger::Error << kBackendId << " Error from coprocess: " << ae.reason << endl;
    cleanup();
  }

  ostringstream oss;
  while (true) {
    string line;
    d_coproc->receive(line);
    if (line == "END")
      break;
    oss << line << std::endl;
  };

  return oss.str();
}

PipeBackend::~PipeBackend()
{
  cleanup();
}

void PipeBackend::throwTooShortDataError(const std::string& what)
{
  g_log << Logger::Error << kBackendId << " Coprocess returned incomplete or empty line in data section for query for " << d_qname << endl;
  throw PDNSException("Format error communicating with coprocess in data section" + what);
}

bool PipeBackend::get(DNSResourceRecord& r)
{
  if (d_disavow) // this query has been blocked
    return false;

  string line;

  // The answer format:
  // DATA    qname           qclass  qtype   ttl     id      content

  try {
    launch();
    for (;;) {
      d_coproc->receive(line);
      vector<string> parts;
      stringtok(parts, line, "\t");
      if (parts.empty()) {
        g_log << Logger::Error << kBackendId << " Coprocess returned empty line in query for " << d_qname << endl;
        throw PDNSException("Format error communicating with coprocess");
      }
      else if (parts[0] == "FAIL") {
        throw DBException("coprocess returned a FAIL");
      }
      else if (parts[0] == "END") {
        return false;
      }
      else if (parts[0] == "LOG") {
        g_log << Logger::Error << "Coprocess: " << line.substr(4) << endl;
        continue;
      }
      else if (parts[0] == "DATA") { // yay
        // The shortest records (ENT) require 6 fields. Other may require more
        // and will have a stricter check once the record type has been
        // computed.
        if (parts.size() < 6 + (d_abiVersion >= 3 ? 2 : 0)) {
          throwTooShortDataError("");
        }

        if (d_abiVersion >= 3) {
          r.scopeMask = std::stoi(parts[1]);
          r.auth = (parts[2] == "1");
          parts.erase(parts.begin() + 1, parts.begin() + 3);
        }
        else {
          r.scopeMask = 0;
          r.auth = true;
        }
        r.qname = DNSName(parts[1]);
        r.qtype = parts[3];
        pdns::checked_stoi_into(r.ttl, parts[4]);
        pdns::checked_stoi_into(r.domain_id, parts[5]);

        switch (r.qtype.getCode()) {
        case QType::ENT:
          // No other data to process
          r.content.clear();
          break;
        case QType::MX:
        case QType::SRV:
          if (parts.size() < 8) {
            throwTooShortDataError(" of MX/SRV record");
          }
          r.content = parts[6] + " " + parts[7];
          break;
        default:
          if (parts.size() < 7) {
            throwTooShortDataError("");
          }
          r.content = parts[6];
          for (std::vector<std::string>::size_type pos = 7; pos < parts.size(); ++pos) {
            r.content.append(1, ' ');
            r.content.append(parts[pos]);
          }
          break;
        }
        break;
      }
      else
        throw PDNSException("Coprocess backend sent incorrect response '" + line + "'");
    }
  }
  catch (DBException& dbe) {
    g_log << Logger::Error << kBackendId << " " << dbe.reason << endl;
    throw;
  }
  catch (PDNSException& pe) {
    g_log << Logger::Error << kBackendId << " " << pe.reason << endl;
    cleanup();
    throw;
  }
  return true;
}

//
// Magic class that is activated when the dynamic library is loaded
//

class PipeFactory : public BackendFactory
{
public:
  PipeFactory() :
    BackendFactory("pipe") {}

  void declareArguments(const string& suffix = "") override
  {
    declare(suffix, "command", "Command to execute for piping questions to", "");
    declare(suffix, "timeout", "Number of milliseconds to wait for an answer", "2000");
    declare(suffix, "regex", "Regular expression of queries to pass to coprocess", "");
    declare(suffix, "abi-version", "Version of the pipe backend ABI", "1");
  }

  DNSBackend* make(const string& suffix = "") override
  {
    return new PipeBackend(suffix);
  }
};

class PipeLoader
{
public:
  PipeLoader()
  {
    BackendMakers().report(std::make_unique<PipeFactory>());
    g_log << Logger::Info << kBackendId << " This is the pipe backend version " VERSION
#ifndef REPRODUCIBLE
          << " (" __DATE__ " " __TIME__ ")"
#endif
          << " reporting" << endl;
  }
};

static PipeLoader pipeloader;

1	/*
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	*/
22	#ifdef HAVE_CONFIG_H
23	#include "config.h"
24	#endif
25	#include <string>
26	#include <map>
27	#include <unistd.h>
28	#include <stdlib.h>
29	#include <sstream>
30	#include "coprocess.hh"
31
32	#include "pdns/namespaces.hh"
33
34	#include "pdns/dns.hh"
35	#include "pdns/dnsbackend.hh"
36	#include "pdns/dnspacket.hh"
37	#include "pdns/pdnsexception.hh"
38	#include "pdns/logger.hh"
39	#include "pdns/arguments.hh"
40	#include <sys/socket.h>
41	#include <netinet/in.h>
42	#include <arpa/inet.h>
43	#include "pipebackend.hh"
44
45	// The following requirement guarantees UnknownDomainID will get output as "-1"
46	// for compatibility.
47	static_assert(std::is_signed<domainid_t>::value);
48
49	static const char* kBackendId = "[PIPEBackend]";
50
51	CoWrapper::CoWrapper(const string& command, int timeout, int abiVersion)
52	{	10✔
53	d_command = command;	10✔
54	d_timeout = timeout;	10✔
55	d_abiVersion = abiVersion;	10✔
56	launch(); // let exceptions fall through - if initial launch fails, we want to die	10✔
57	// I think
58	}	10✔
59
60	CoWrapper::~CoWrapper() = default;	2✔
61
62	void CoWrapper::launch()
63	{	54✔
64	if (d_cp)	54✔
65	return;	44✔
66
67	if (d_command.empty())	10!
68	throw ArgException("pipe-command is not specified");	×
69
70	if (isUnixSocket(d_command)) {	10!
71	d_cp = std::make_unique<UnixRemote>(d_command);	×
72	}	×
73	else {	10✔
74	auto coprocess = std::make_unique<CoProcess>(d_command, d_timeout);	10✔
75	coprocess->launch();	10✔
76	d_cp = std::move(coprocess);	10✔
77	}	10✔
78
79	d_cp->send("HELO\t" + std::to_string(d_abiVersion));	10✔
80	string banner;	10✔
81	d_cp->receive(banner);	10✔
82	g_log << Logger::Error << "Backend launched with banner: " << banner << endl;	10✔
83	}	10✔
84
85	void CoWrapper::send(const string& line)
86	{	17✔
87	launch();	17✔
88	try {	17✔
89	d_cp->send(line);	17✔
90	return;	17✔
91	}	17✔
92	catch (PDNSException& ae) {	17✔
93	d_cp.reset();	×
94	throw;	×
95	}	×
96	}	17✔
97	void CoWrapper::receive(string& line)
98	{	27✔
99	launch();	27✔
100	try {	27✔
101	d_cp->receive(line);	27✔
102	return;	27✔
103	}	27✔
104	catch (PDNSException& ae) {	27✔
105	g_log << Logger::Warning << kBackendId << " Unable to receive data from coprocess. " << ae.reason << endl;	×
106	d_cp.reset();	×
107	throw;	×
108	}	×
109	}	27✔
110
111	PipeBackend::PipeBackend(const string& suffix)
112	{	10✔
113	d_disavow = false;	10✔
114	setArgPrefix("pipe" + suffix);	10✔
115	try {	10✔
116	launch();	10✔
117	}	10✔
118	catch (const ArgException& A) {	10✔
119	g_log << Logger::Error << kBackendId << " Unable to launch, fatal argument error: " << A.reason << endl;	×
120	throw;	×
121	}	×
122	catch (...) {	10✔
123	throw;	×
124	}	×
125	}	10✔
126
127	void PipeBackend::launch()
128	{	54✔
129	if (d_coproc)	54✔
130	return;	44✔
131
132	try {	10✔
133	if (!getArg("regex").empty()) {	10!
134	d_regex = std::make_unique<Regex>(getArg("regex"));	×
135	}	×
136	d_regexstr = getArg("regex");	10✔
137	d_abiVersion = getArgAsNum("abi-version");	10✔
138	d_coproc = std::make_unique<CoWrapper>(getArg("command"), getArgAsNum("timeout"), getArgAsNum("abi-version"));	10✔
139	}	10✔
140
141	catch (const ArgException& A) {	10✔
142	cleanup();	×
143	throw;	×
144	}	×
145	}	10✔
146
147	/*
148	* Cleans up the co-process wrapper
149	*/
150	void PipeBackend::cleanup()
151	{	2✔
152	d_coproc.reset(nullptr);	2✔
153	d_regex.reset();	2✔
154	d_regexstr = string();	2✔
155	d_abiVersion = 0;	2✔
156	}	2✔
157
158	void PipeBackend::lookup(const QType& qtype, const DNSName& qname, domainid_t zoneId, DNSPacket* pkt_p)
159	{	17✔
160	try {	17✔
161	launch();	17✔
162	d_disavow = false;	17✔
163	if (d_regex && !d_regex->match(qname.toStringRootDot())) {	17!
164	if (::arg().mustDo("query-logging"))	×
165	g_log << Logger::Error << "Query for '" << qname << "' failed regex '" << d_regexstr << "'" << endl;	×
166	d_disavow = true; // don't pass to backend	×
167	}	×
168	else {	17✔
169	ostringstream query;	17✔
170	string localIP = "0.0.0.0";	17✔
171	string remoteIP = "0.0.0.0";	17✔
172	Netmask realRemote("0.0.0.0/0");	17✔
173	if (pkt_p) {	17✔
174	localIP = pkt_p->getLocal().toString();	8✔
175	realRemote = pkt_p->getRealRemote();	8✔
176	remoteIP = pkt_p->getInnerRemote().toString();	8✔
177	}	8✔
178	// abi-version = 1
179	// type qname qclass qtype id remote-ip-address
180	query << "Q\t" << qname.toStringRootDot() << "\tIN\t" << qtype.toString() << "\t" << zoneId << "\t" << remoteIP;	17✔
181
182	// add the local-ip-address if abi-version is set to 2
183	if (d_abiVersion >= 2)	17✔
184	query << "\t" << localIP;	13✔
185	if (d_abiVersion >= 3)	17✔
186	query << "\t" << realRemote.toString();	13✔
187
188	if (::arg().mustDo("query-logging"))	17!
189	g_log << Logger::Error << "Query: '" << query.str() << "'" << endl;	×
190	d_coproc->send(query.str());	17✔
191	}	17✔
192	}	17✔
193	catch (PDNSException& pe) {	17✔
194	g_log << Logger::Error << kBackendId << " Error from coprocess: " << pe.reason << endl;	×
195	d_disavow = true;	×
196	}	×
197	d_qtype = qtype;	17✔
198	d_qname = qname;	17✔
199	}	17✔
200
201	bool PipeBackend::list(const ZoneName& target, domainid_t domain_id, bool /* include_disabled */)
202	{	×
203	try {	×
204	launch();	×
205	d_disavow = false;	×
206	ostringstream query;	×
207	// The question format:
208
209	// type qname qclass qtype id ip-address
210	if (d_abiVersion >= 4)	×
211	query << "AXFR\t" << domain_id << "\t" << target.toStringRootDot();	×
212	else	×
213	query << "AXFR\t" << domain_id;	×
214
215	d_coproc->send(query.str());	×
216	}	×
217	catch (PDNSException& ae) {	×
218	g_log << Logger::Error << kBackendId << " Error from coprocess: " << ae.reason << endl;	×
219	}	×
220	d_qname = DNSName(std::to_string(domain_id)); // why do we store a number here??	×
221	return true;	×
222	}	×
223
224	string PipeBackend::directBackendCmd(const string& query)
225	{	×
226	if (d_abiVersion < 5)	×
227	return "not supported on ABI version " + std::to_string(d_abiVersion) + " (use ABI version 5 or later)\n";	×
228
229	try {	×
230	launch();	×
231	ostringstream oss;	×
232	oss << "CMD\t" << query;	×
233	d_coproc->send(oss.str());	×
234	}	×
235	catch (PDNSException& ae) {	×
236	g_log << Logger::Error << kBackendId << " Error from coprocess: " << ae.reason << endl;	×
237	cleanup();	×
238	}	×
239
240	ostringstream oss;	×
241	while (true) {	×
242	string line;	×
243	d_coproc->receive(line);	×
244	if (line == "END")	×
245	break;	×
246	oss << line << std::endl;	×
247	};	×
248
249	return oss.str();	×
250	}	×
251
252	PipeBackend::~PipeBackend()
253	{	2✔
254	cleanup();	2✔
255	}	2✔
256
257	void PipeBackend::throwTooShortDataError(const std::string& what)
258	{	×
259	g_log << Logger::Error << kBackendId << " Coprocess returned incomplete or empty line in data section for query for " << d_qname << endl;	×
260	throw PDNSException("Format error communicating with coprocess in data section" + what);	×
261	}	×
262
263	bool PipeBackend::get(DNSResourceRecord& r)
264	{	27✔
265	if (d_disavow) // this query has been blocked	27!
266	return false;	×
267
268	string line;	27✔
269
270	// The answer format:
271	// DATA qname qclass qtype ttl id content
272
273	try {	27✔
274	launch();	27✔
275	for (;;) {	27✔
276	d_coproc->receive(line);	27✔
277	vector<string> parts;	27✔
278	stringtok(parts, line, "\t");	27✔
279	if (parts.empty()) {	27!
280	g_log << Logger::Error << kBackendId << " Coprocess returned empty line in query for " << d_qname << endl;	×
281	throw PDNSException("Format error communicating with coprocess");	×
282	}	×
283	else if (parts[0] == "FAIL") {	27!
284	throw DBException("coprocess returned a FAIL");	×
285	}	×
286	else if (parts[0] == "END") {	27✔
287	return false;	17✔
288	}	17✔
289	else if (parts[0] == "LOG") {	10!
290	g_log << Logger::Error << "Coprocess: " << line.substr(4) << endl;	×
291	continue;	×
292	}	×
293	else if (parts[0] == "DATA") { // yay	10!
294	// The shortest records (ENT) require 6 fields. Other may require more
295	// and will have a stricter check once the record type has been
296	// computed.
297	if (parts.size() < 6 + (d_abiVersion >= 3 ? 2 : 0)) {	10!
298	throwTooShortDataError("");	×
299	}	×
300
301	if (d_abiVersion >= 3) {	10✔
302	r.scopeMask = std::stoi(parts[1]);	8✔
303	r.auth = (parts[2] == "1");	8✔
304	parts.erase(parts.begin() + 1, parts.begin() + 3);	8✔
305	}	8✔
306	else {	2✔
307	r.scopeMask = 0;	2✔
308	r.auth = true;	2✔
309	}	2✔
310	r.qname = DNSName(parts[1]);	10✔
311	r.qtype = parts[3];	10✔
312	pdns::checked_stoi_into(r.ttl, parts[4]);	10✔
313	pdns::checked_stoi_into(r.domain_id, parts[5]);	10✔
314
315	switch (r.qtype.getCode()) {	10✔
316	case QType::ENT:	×
317	// No other data to process
318	r.content.clear();	×
319	break;	×
320	case QType::MX:	1✔
321	case QType::SRV:	1!
322	if (parts.size() < 8) {	1!
323	throwTooShortDataError(" of MX/SRV record");	×
324	}	×
325	r.content = parts[6] + " " + parts[7];	1✔
326	break;	1✔
327	default:	9✔
328	if (parts.size() < 7) {	9!
329	throwTooShortDataError("");	×
330	}	×
331	r.content = parts[6];	9✔
332	for (std::vector<std::string>::size_type pos = 7; pos < parts.size(); ++pos) {	9!
333	r.content.append(1, ' ');	×
334	r.content.append(parts[pos]);	×
335	}	×
336	break;	9✔
337	}	10✔
338	break;	10✔
339	}	10✔
UNCOV 340	else	×
UNCOV 341	throw PDNSException("Coprocess backend sent incorrect response '" + line + "'");	×
342	}	27✔
343	}	27✔
344	catch (DBException& dbe) {	27✔
345	g_log << Logger::Error << kBackendId << " " << dbe.reason << endl;	×
346	throw;	×
347	}	×
348	catch (PDNSException& pe) {	27✔
349	g_log << Logger::Error << kBackendId << " " << pe.reason << endl;	×
350	cleanup();	×
351	throw;	×
352	}	×
353	return true;	10✔
354	}	27✔
355
356	//
357	// Magic class that is activated when the dynamic library is loaded
358	//
359
360	class PipeFactory : public BackendFactory
361	{
362	public:
363	PipeFactory() :
364	BackendFactory("pipe") {}	5,869✔
365
366	void declareArguments(const string& suffix = "") override
367	{	2✔
368	declare(suffix, "command", "Command to execute for piping questions to", "");	2✔
369	declare(suffix, "timeout", "Number of milliseconds to wait for an answer", "2000");	2✔
370	declare(suffix, "regex", "Regular expression of queries to pass to coprocess", "");	2✔
371	declare(suffix, "abi-version", "Version of the pipe backend ABI", "1");	2✔
372	}	2✔
373
374	DNSBackend* make(const string& suffix = "") override
375	{	10✔
376	return new PipeBackend(suffix);	10✔
377	}	10✔
378	};
379
380	class PipeLoader
381	{
382	public:
383	PipeLoader()
384	{	5,869✔
385	BackendMakers().report(std::make_unique<PipeFactory>());	5,869✔
386	g_log << Logger::Info << kBackendId << " This is the pipe backend version " VERSION	5,869✔
387	#ifndef REPRODUCIBLE	5,869✔
388	<< " (" __DATE__ " " __TIME__ ")"	5,869✔
389	#endif	5,869✔
390	<< " reporting" << endl;	5,869✔
391	}	5,869✔
392	};
393
394	static PipeLoader pipeloader;

PowerDNS / pdns / 19176325108

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