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/*
* 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 <iostream>
#include <fcntl.h>
#include "pdnsexception.hh"
#include "arguments.hh"
#include "credentials.hh"
#include "namespaces.hh"
#include "rec_channel.hh"
ArgvMap& arg()
{
static ArgvMap arg;
return arg;
}
static void initArguments(int argc, char** argv)
{
arg().set("config-dir", "Location of configuration directory (recursor.conf)") = SYSCONFDIR;
arg().set("socket-dir", string("Where the controlsocket will live, ") + LOCALSTATEDIR + "/pdns-recursor when unset and not chrooted") = "";
arg().set("chroot", "switch to chroot jail") = "";
arg().set("process", "When controlling multiple recursors, the target process number") = "";
arg().set("timeout", "Number of seconds to wait for the recursor to respond") = "5";
arg().set("config-name", "Name of this virtual configuration - will rename the binary image") = "";
arg().setCmd("help", "Provide this helpful message");
arg().setCmd("version", "Show the version of this program");
arg().laxParse(argc, argv);
if (arg().mustDo("version")) {
cout << "rec_control version " << VERSION << endl;
exit(0);
}
if (arg().mustDo("help") || arg().getCommands().empty()) {
cout << "syntax: rec_control [options] command, options as below: " << endl
<< endl;
cout << arg().helpstring(arg()["help"]) << endl;
cout << "In addition, 'rec_control help' can be used to retrieve a list\nof available commands from PowerDNS" << endl;
exit(arg().mustDo("help") ? 0 : 99);
}
string configname = ::arg()["config-dir"] + "/recursor.conf";
if (::arg()["config-name"] != "")
configname = ::arg()["config-dir"] + "/recursor-" + ::arg()["config-name"] + ".conf";
cleanSlashes(configname);
arg().laxFile(configname.c_str());
arg().laxParse(argc, argv); // make sure the commandline wins
if (::arg()["socket-dir"].empty()) {
if (::arg()["chroot"].empty())
::arg().set("socket-dir") = std::string(LOCALSTATEDIR) + "/pdns-recursor";
else
::arg().set("socket-dir") = ::arg()["chroot"] + "/";
}
else if (!::arg()["chroot"].empty()) {
::arg().set("socket-dir") = ::arg()["chroot"] + "/" + ::arg()["socket-dir"];
}
}
int main(int argc, char** argv)
{
g_slogStructured = false;
const set<string> fileCommands = {
"dump-cache",
"dump-edns",
"dump-ednsstatus",
"dump-nsspeeds",
"dump-failedservers",
"dump-rpz",
"dump-throttlemap",
"dump-non-resolving",
"dump-saved-parent-ns-sets",
"dump-dot-probe-map",
};
try {
initArguments(argc, argv);
string sockname = "pdns_recursor";
if (arg()["config-name"] != "")
sockname += "-" + arg()["config-name"];
if (!arg()["process"].empty())
sockname += "." + arg()["process"];
sockname.append(".controlsocket");
const vector<string>& commands = arg().getCommands();
if (commands.size() >= 1 && commands.at(0) == "hash-password") {
uint64_t workFactor = CredentialsHolder::s_defaultWorkFactor;
if (commands.size() > 1) {
try {
pdns::checked_stoi_into(workFactor, commands.at(1));
}
catch (const std::exception& e) {
cerr << "Unable to parse the supplied work factor: " << e.what() << endl;
return EXIT_FAILURE;
}
}
auto password = CredentialsHolder::readFromTerminal();
try {
cout << hashPassword(password.getString(), workFactor, CredentialsHolder::s_defaultParallelFactor, CredentialsHolder::s_defaultBlockSize) << endl;
return EXIT_SUCCESS;
}
catch (const std::exception& e) {
cerr << "Error while hashing the supplied password: " << e.what() << endl;
return EXIT_FAILURE;
}
}
string command;
int fd = -1;
unsigned int i = 0;
while (i < commands.size()) {
if (i > 0) {
command += " ";
}
command += commands[i];
if (fileCommands.count(commands[i]) > 0) {
if (i + 1 < commands.size()) {
// dump-rpz is different, it also has a zonename as argument
if (commands[i] == "dump-rpz") {
if (i + 2 < commands.size()) {
++i;
command += " " + commands[i]; // add rpzname and continue with filename
}
else {
throw PDNSException("Command needs a zone and file argument");
}
}
++i;
if (commands[i] == "-") {
fd = STDOUT_FILENO;
}
else {
fd = open(commands[i].c_str(), O_CREAT | O_EXCL | O_WRONLY, 0660);
}
if (fd == -1) {
int err = errno;
throw PDNSException("Error opening dump file for writing: " + stringerror(err));
}
}
else {
throw PDNSException("Command needs a file argument");
}
}
++i;
}
auto timeout = arg().asNum("timeout");
RecursorControlChannel rccS;
rccS.connect(arg()["socket-dir"], sockname);
rccS.send(rccS.d_fd, {0, command}, timeout, fd);
auto receive = rccS.recv(rccS.d_fd, timeout);
if (receive.d_ret != 0) {
cerr << receive.d_str;
}
else {
cout << receive.d_str;
}
return receive.d_ret;
}
catch (PDNSException& ae) {
cerr << "Fatal: " << ae.reason << "\n";
return 1;
}
}
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