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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 <bitset>
#include "dnsparser.hh"
#include "dns_random.hh"
#include "iputils.hh"
#include <boost/program_options.hpp>
#include <boost/format.hpp>
#include <boost/utility.hpp>
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index/key_extractors.hpp>
#include "mplexer.hh"
#include "statbag.hh"
#include "arguments.hh"
#include "version.hh"
#include "namespaces.hh"
using namespace ::boost::multi_index;
namespace po = boost::program_options;
po::variables_map g_vm;
StatBag S;
ArgvMap &arg()
{
static ArgvMap arg;
return arg;
}
static void usage() {
cerr<<"Syntax: pdns_notify IP_ADDRESS/HOSTNAME[:PORT] DOMAIN"<<endl;
}
int main(int argc, char** argv)
try
{
set<ComboAddress> addrs;
::arg().set("rng")="auto";
::arg().set("entropy-source")="/dev/urandom";
for(int n=1 ; n < argc; ++n) {
if ((string) argv[n] == "--help") {
usage();
return EXIT_SUCCESS;
}
if ((string) argv[n] == "--version") {
cerr<<"notify "<<VERSION<<endl;
return EXIT_SUCCESS;
}
}
if(argc!=3) {
usage();
exit(1);
}
int sock = -1;
// ComboAddress local("127.0.0.1", (int)0);
// if(::bind(sock, (struct sockaddr*) &local, local.getSocklen()) < 0)
// throw runtime_error("Failed to bind local socket to address "+local.toString()+": "+stringerror());
try {
addrs.emplace(ComboAddress{argv[1], 53});
} catch (PDNSException &ex) {
/* needs resolving, maybe */
struct addrinfo *info;
vector<string> parts;
boost::split(parts, argv[1], [](char c){return c == ':';});
if (parts.size() == 1)
parts.push_back("domain");
else if (parts.size() != 2)
throw runtime_error("Invalid hostname:port syntax");
if (getaddrinfo(parts[0].c_str(), parts[1].c_str(), NULL, &info) != 0)
throw runtime_error("Cannot resolve '" + string(argv[1]) +"'");
for(auto ptr = info; ptr != NULL; ptr = ptr->ai_next)
addrs.emplace(ComboAddress{ptr->ai_addr, ptr->ai_addrlen});
}
for(const auto &addr: addrs) {
if (sock > -1)
(void)close(sock);
sock = socket(addr.sin4.sin_family, SOCK_DGRAM, 0);
if(sock < 0)
throw runtime_error("Creating socket for incoming packets: "+stringerror());
if(connect(sock, (struct sockaddr*)&addr, addr.getSocklen()) < 0) {
cerr<<"Failed to connect to address "+addr.toStringWithPort()+": "+stringerror()<<endl;
continue;
}
vector<uint8_t> outpacket;
DNSPacketWriter pw(outpacket, DNSName(argv[2]), QType::SOA, 1, Opcode::Notify);
pw.getHeader()->id = dns_random_uint16();
if(send(sock, &outpacket[0], outpacket.size(), 0) < 0) {
cerr<<"Unable to send notify to "<<addr.toStringWithPort()<<": "+stringerror()<<endl;
continue;
}
char buffer[1500];
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(sock, &rfds);
fd_set errfds;
FD_ZERO(&errfds);
FD_SET(sock, &errfds);
int len;
struct timeval tv;
bool timeout = true;
for(int tries=0; tries<60; tries++) {
tv.tv_sec = 1;
tv.tv_usec = 0;
if ((len = select(sock+1, &rfds, nullptr, &errfds, &tv)) > 0) {
len = recv(sock, buffer, sizeof(buffer), 0);
timeout = false;
break;
}
}
if(len < 0) {
cerr<<"Unable to receive notification response from "<<addr.toStringWithPort()<<": "+stringerror()<<endl;
continue;
} else if (timeout) {
cerr<<"Unable to receive notification response from "<<addr.toStringWithPort()<<": Timed out"<<endl;
continue;
} else if (len == 0) {
cerr<<"Unable to receive notification response from "<<addr.toStringWithPort()<<": EOF"<<endl;
continue;
}
string packet(buffer, len);
MOADNSParser mdp(false, packet);
if (mdp.d_header.rcode == 0)
cerr<<"Successfully notified "<<addr.toStringWithPort()<<endl;
else
cerr<<"Received notification response with error from "<<addr.toStringWithPort()<<": "<<RCode::to_s(mdp.d_header.rcode)<<endl;
cerr<<"For: '"<<mdp.d_qname<<"'"<<endl;
}
}
catch(std::exception& e)
{
cerr<<"Fatal: "<<e.what()<<endl;
}
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