mirror of
https://github.com/anope/anope.git
synced 2026-06-25 23:06:38 +02:00
Adam
1057fa8421
because it will not forward non recursive queries. So, added support for SOA, NS, and AXFR requests.
575 lines
15 KiB
C++
575 lines
15 KiB
C++
/*
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* (C) 2003-2012 Anope Team
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* Contact us at team@anope.org
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*
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* Please read COPYING and README for further details.
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*/
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#include "module.h"
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class DNSServer;
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static std::vector<DNSServer *> dns_servers;
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static std::map<Anope::string, std::list<time_t> > server_quit_times;
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class DNSServer : public Serializable
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{
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Anope::string server_name;
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std::vector<Anope::string> ips;
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unsigned limit;
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bool pooled;
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DNSServer() : Serializable("DNSServer"), limit(0), pooled(false), repool(0) { dns_servers.push_back(this); }
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public:
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time_t repool;
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DNSServer(const Anope::string &sn) : Serializable("DNSServer"), server_name(sn), limit(0), pooled(false), repool(0)
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{
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dns_servers.push_back(this);
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}
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~DNSServer()
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{
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std::vector<DNSServer *>::iterator it = std::find(dns_servers.begin(), dns_servers.end(), this);
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if (it != dns_servers.end())
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dns_servers.erase(it);
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}
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const Anope::string &GetName() const { return server_name; }
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std::vector<Anope::string> &GetIPs() { return ips; }
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unsigned GetLimit() const { return limit; }
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void SetLimit(unsigned l) { limit = l; }
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bool Pooled() const { return pooled; }
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void Pool(bool p)
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{
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pooled = p;
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if (DNSEngine)
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DNSEngine->UpdateSerial();
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}
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Serialize::Data serialize() const anope_override
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{
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Serialize::Data data;
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data["server_name"] << server_name;
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for (unsigned i = 0; i < ips.size(); ++i)
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data["ip" + stringify(i)] << ips[i];
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data["limit"] << limit;
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data["pooled"] << pooled;
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return data;
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}
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static Serializable* unserialize(Serializable *obj, Serialize::Data &data)
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{
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DNSServer *req;
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if (obj)
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req = anope_dynamic_static_cast<DNSServer *>(obj);
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else
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req = new DNSServer();
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data["server_name"] >> req->server_name;
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for (unsigned i = 0; data.count("ip" + stringify(i)); ++i)
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{
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Anope::string ip_str;
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data["ip" + stringify(i)] >> ip_str;
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req->ips.push_back(ip_str);
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}
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data["limit"] >> req->limit;
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data["pooled"] >> req->pooled;
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return req;
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}
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static DNSServer *Find(const Anope::string &s)
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{
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for (unsigned i = 0; i < dns_servers.size(); ++i)
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if (dns_servers[i]->GetName() == s)
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return dns_servers[i];
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return NULL;
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}
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};
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class CommandOSDNS : public Command
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{
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void DisplayPoolState(CommandSource &source)
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{
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if (dns_servers.empty())
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{
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source.Reply(_("There are no configured servers."));
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return;
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}
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ListFormatter lf;
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lf.addColumn("Server").addColumn("IP").addColumn("Limit").addColumn("State");
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for (unsigned i = 0; i < dns_servers.size(); ++i)
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{
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DNSServer *s = dns_servers[i];
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Server *srv = Server::Find(s->GetName());
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ListFormatter::ListEntry entry;
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entry["Server"] = s->GetName();
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entry["Limit"] = s->GetLimit() ? stringify(s->GetLimit()) : "None";
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Anope::string ip_str;
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for (unsigned j = 0; j < s->GetIPs().size(); ++j)
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ip_str += s->GetIPs()[j] + " ";
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ip_str.trim();
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if (ip_str.empty())
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ip_str = "None";
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entry["IP"] = ip_str;
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if (!srv)
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entry["State"] = "Split";
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else if (s->Pooled())
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entry["State"] = "Pooled";
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else
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entry["State"] = "Unpooled";
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lf.addEntry(entry);
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}
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std::vector<Anope::string> replies;
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lf.Process(replies);
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for (unsigned i = 0; i < replies.size(); ++i)
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source.Reply(replies[i]);
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}
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void OnAdd(CommandSource &source, const std::vector<Anope::string> ¶ms)
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{
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DNSServer *s = DNSServer::Find(params[1]);
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if (s)
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{
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source.Reply(_("Server %s already exists."), params[1].c_str());
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return;
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}
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if (!Server::Find(params[1]))
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{
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source.Reply(_("Server %s is not linked to the network."), params[1].c_str());
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return;
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}
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s = new DNSServer(params[1]);
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source.Reply(_("Added server %s."), s->GetName().c_str());
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Log(LOG_ADMIN, source, this) << "to add server " << s->GetName();
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}
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void OnDel(CommandSource &source, const std::vector<Anope::string> ¶ms)
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{
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DNSServer *s = DNSServer::Find(params[1]);
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if (!s)
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{
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source.Reply(_("Server %s does not exist."), params[1].c_str());
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return;
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}
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else if (Server::Find(s->GetName()))
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{
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source.Reply(_("Server %s must be quit before it can be deleted."), s->GetName().c_str());
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return;
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}
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Log(LOG_ADMIN, source, this) << "to delete server " << s->GetName();
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source.Reply(_("Removed server %s."), s->GetName().c_str());
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delete s;
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}
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void AddIP(CommandSource &source, const std::vector<Anope::string> ¶ms)
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{
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DNSServer *s = DNSServer::Find(params[1]);
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if (!s)
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{
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source.Reply(_("Server %s does not exist."), params[1].c_str());
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return;
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}
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for (unsigned i = 0; i < s->GetIPs().size(); ++i)
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if (params[2].equals_ci(s->GetIPs()[i]))
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{
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source.Reply(_("IP %s already exists for %s."), s->GetIPs()[i].c_str(), s->GetName().c_str());
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return;
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}
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sockaddrs addr;
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try
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{
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addr.pton(AF_INET, params[2]);
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}
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catch (const SocketException &)
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{
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try
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{
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addr.pton(AF_INET6, params[2]);
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}
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catch (const SocketException &)
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{
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source.Reply(_("%s is not a valid IP address."), params[2].c_str());
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return;
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}
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}
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s->GetIPs().push_back(params[2]);
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source.Reply(_("Added IP %s to %s."), params[2].c_str(), s->GetName().c_str());
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Log(LOG_ADMIN, source, this) << "to add IP " << params[2] << " to " << s->GetName();
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if (s->Pooled())
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DNSEngine->UpdateSerial();
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}
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void DelIP(CommandSource &source, const std::vector<Anope::string> ¶ms)
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{
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DNSServer *s = DNSServer::Find(params[1]);
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if (!s)
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{
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source.Reply(_("Server %s does not exist."), params[1].c_str());
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return;
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}
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for (unsigned i = 0; i < s->GetIPs().size(); ++i)
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if (params[2].equals_ci(s->GetIPs()[i]))
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{
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s->GetIPs().erase(s->GetIPs().begin() + i);
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source.Reply(_("Removed IP %s from %s."), params[2].c_str(), s->GetName().c_str());
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Log(LOG_ADMIN, source, this) << "to remove IP " << params[2] << " from " << s->GetName();
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if (s->GetIPs().empty())
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{
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s->repool = 0;
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s->Pool(false);
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}
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if (s->Pooled())
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DNSEngine->UpdateSerial();
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return;
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}
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source.Reply(_("IP %s does not exist for %s."), params[2].c_str(), s->GetName().c_str());
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}
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void OnSet(CommandSource &source, const std::vector<Anope::string> ¶ms)
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{
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DNSServer *s = DNSServer::Find(params[1]);
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if (!s)
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{
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source.Reply(_("Server %s does not exist."), params[1].c_str());
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return;
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}
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if (params[2].equals_ci("LIMIT"))
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{
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try
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{
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unsigned l = convertTo<unsigned>(params[3]);
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s->SetLimit(l);
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if (l)
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source.Reply(_("User limit for %s set to %d."), s->GetName().c_str(), l);
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else
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source.Reply(_("User limit for %s removed."), s->GetName().c_str());
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}
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catch (const ConvertException &ex)
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{
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source.Reply(_("Invalid value for LIMIT. Must be numerical."));
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}
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}
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else
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source.Reply(_("Unknown SET option"));
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}
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void OnPool(CommandSource &source, const std::vector<Anope::string> ¶ms)
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{
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DNSServer *s = DNSServer::Find(params[1]);
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if (!s)
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{
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source.Reply(_("Server %s does not exist."), params[1].c_str());
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return;
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}
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else if (!Server::Find(s->GetName()))
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{
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source.Reply(_("Server %s is not currently linked."), s->GetName().c_str());
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return;
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}
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else if (s->Pooled())
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{
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source.Reply(_("Server %s is already pooled."), s->GetName().c_str());
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return;
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}
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else if (s->GetIPs().empty())
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{
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source.Reply(_("Server %s has no configured IPs."), s->GetName().c_str());
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}
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s->Pool(true);
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source.Reply(_("Pooled %s."), s->GetName().c_str());
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Log(LOG_ADMIN, source, this) << "to pool " << s->GetName();
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}
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void OnDepool(CommandSource &source, const std::vector<Anope::string> ¶ms)
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{
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DNSServer *s = DNSServer::Find(params[1]);
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if (!s)
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{
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source.Reply(_("Server %s does not exist."), params[1].c_str());
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return;
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}
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else if (!s->Pooled())
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{
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source.Reply(_("Server %s is not pooled."), s->GetName().c_str());
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return;
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}
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s->Pool(false);
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source.Reply(_("Depooled %s."), s->GetName().c_str());
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Log(LOG_ADMIN, source, this) << "to depool " << s->GetName();
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}
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public:
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CommandOSDNS(Module *creator) : Command(creator, "operserv/dns", 0, 3)
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{
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this->SetDesc(_("Manage the DNS zone for this network"));
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this->SetSyntax(_("ADD \037server.name\037"));
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this->SetSyntax(_("DEL \037server.name\037"));
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this->SetSyntax(_("ADDIP \037server.name\037 \037ip\037"));
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this->SetSyntax(_("DELIP \037server.name\037 \037ip\037"));
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this->SetSyntax(_("SET \037server.name\037 \37option\37 \037value\037"));
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this->SetSyntax(_("POOL \037server.name\037"));
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this->SetSyntax(_("DEPOOL \037server.name\037"));
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}
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void Execute(CommandSource &source, const std::vector<Anope::string> ¶ms) anope_override
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{
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if (params.empty())
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this->DisplayPoolState(source);
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else if (params[0].equals_ci("ADD") && params.size() > 1)
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this->OnAdd(source, params);
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else if (params[0].equals_ci("DEL") && params.size() > 1)
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this->OnDel(source, params);
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else if (params[0].equals_ci("ADDIP") && params.size() > 2)
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this->AddIP(source, params);
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else if (params[0].equals_ci("DELIP") && params.size() > 2)
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this->DelIP(source, params);
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else if (params[0].equals_ci("SET") && params.size() > 3)
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this->OnSet(source, params);
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else if (params[0].equals_ci("POOL") && params.size() > 1)
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this->OnPool(source, params);
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else if (params[0].equals_ci("DEPOOL") && params.size() > 1)
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this->OnDepool(source, params);
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else
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this->OnSyntaxError(source, "");
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}
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bool OnHelp(CommandSource &source, const Anope::string &subcommand) anope_override
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{
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this->SendSyntax(source);
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source.Reply(" ");
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source.Reply(_("This command allows managing a DNS zone\n"
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"used for controlling what servers users\n"
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"are directed to when connecting. Omitting\n"
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"all parameters prints out the status of\n"
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"the DNS zone.\n"));
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return true;
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}
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};
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class ModuleDNS : public Module
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{
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SerializeType dns_type;
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CommandOSDNS commandosdns;
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time_t ttl;
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int user_drop_mark;
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time_t user_drop_time;
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time_t user_drop_readd_time;
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bool remove_split_servers;
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bool readd_connected_servers;
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public:
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ModuleDNS(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, SUPPORTED),
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dns_type("DNSServer", DNSServer::unserialize), commandosdns(this)
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{
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this->SetAuthor("Anope");
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Implementation i[] = { I_OnReload, I_OnNewServer, I_OnServerQuit, I_OnUserConnect, I_OnUserLogoff, I_OnDnsRequest };
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ModuleManager::Attach(i, this, sizeof(i) / sizeof(Implementation));
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this->OnReload();
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}
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void OnReload() anope_override
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{
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ConfigReader config;
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this->ttl = dotime(config.ReadValue("os_dns", "ttl", 0));
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this->user_drop_mark = config.ReadInteger("os_dns", "user_drop_mark", 0, false);
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this->user_drop_time = dotime(config.ReadValue("os_dns", "user_drop_time", 0, false));
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this->user_drop_readd_time = dotime(config.ReadValue("os_dns", "user_drop_readd_time", 0, false));
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this->remove_split_servers = config.ReadFlag("os_dns", "remove_split_servers", 0);
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this->readd_connected_servers = config.ReadFlag("os_dns", "readd_connected_servers", 0);
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}
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void OnNewServer(Server *s) anope_override
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{
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if (this->readd_connected_servers)
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{
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DNSServer *dns = DNSServer::Find(s->GetName());
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if (dns && !dns->Pooled() && !dns->GetIPs().empty() && dns->GetLimit() < s->Users)
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{
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dns->Pool(true);
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Log() << "Pooling server " << s->GetName();
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}
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}
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}
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void OnServerQuit(Server *s) anope_override
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{
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DNSServer *dns = DNSServer::Find(s->GetName());
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if (dns && dns->Pooled())
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{
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dns->Pool(false);
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Log() << "Depooling delinked server " << s->GetName();
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}
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}
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void OnUserConnect(dynamic_reference<User> &u, bool &exempt) anope_override
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{
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if (u && u->server)
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{
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DNSServer *s = DNSServer::Find(u->server->GetName());
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/* Check for user limit reached */
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if (s && s->GetLimit() && s->Pooled() && u->server->Users >= s->GetLimit())
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{
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Log() << "Depooling full server " << s->GetName() << ": " << u->server->Users << " users";
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s->Pool(false);
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}
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}
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}
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void OnUserLogoff(User *u) anope_override
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{
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if (u && u->server)
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{
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DNSServer *s = DNSServer::Find(u->server->GetName());
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if (!s)
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return;
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/* Check for dropping under userlimit */
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if (s->GetLimit() && !s->Pooled() && s->GetLimit() > u->server->Users)
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{
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Log() << "Pooling server " << s->GetName();
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s->Pool(true);
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}
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if (this->user_drop_mark > 0)
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{
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std::list<time_t>& times = server_quit_times[u->server->GetName()];
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times.push_back(Anope::CurTime);
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if (times.size() > static_cast<unsigned>(this->user_drop_mark))
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times.pop_front();
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if (s->Pooled() && times.size() == static_cast<unsigned>(this->user_drop_mark))
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{
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time_t diff = Anope::CurTime - *times.begin();
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/* Check for very fast user drops */
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if (diff <= this->user_drop_time)
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{
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Log() << "Depooling server " << s->GetName() << ": dropped " << this->user_drop_mark << " users in " << diff << " seconds";
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s->repool = Anope::CurTime + this->user_drop_readd_time;
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s->Pool(false);
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}
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/* Check for needing to re-pool a server that dropped users */
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else if (s->repool && s->repool <= Anope::CurTime && !s->Pooled())
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{
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s->Pool(true);
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s->repool = 0;
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Log() << "Pooling server " << s->GetName();
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}
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}
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}
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}
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}
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void OnDnsRequest(DNSPacket &req, DNSPacket *packet) anope_override
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{
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if (req.questions.empty())
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|
return;
|
|
/* Currently we reply to any QR for A/AAAA */
|
|
const Question& q = req.questions[0];
|
|
if (q.type != DNS_QUERY_A && q.type != DNS_QUERY_AAAA && q.type != DNS_QUERY_AXFR)
|
|
return;
|
|
|
|
for (unsigned i = 0; i < dns_servers.size(); ++i)
|
|
{
|
|
DNSServer *s = dns_servers[i];
|
|
if (!s->Pooled())
|
|
continue;
|
|
|
|
for (unsigned j = 0; j < s->GetIPs().size(); ++j)
|
|
{
|
|
QueryType q_type = s->GetIPs()[j].find(':') != Anope::string::npos ? DNS_QUERY_AAAA : DNS_QUERY_A;
|
|
|
|
if (q.type == DNS_QUERY_AXFR || q_type == q.type)
|
|
{
|
|
ResourceRecord rr(q.name, q_type);
|
|
rr.ttl = this->ttl;
|
|
rr.rdata = s->GetIPs()[j];
|
|
packet->answers.push_back(rr);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (packet->answers.empty())
|
|
{
|
|
static time_t last_warn = 0;
|
|
if (last_warn + 60 < Anope::CurTime)
|
|
{
|
|
last_warn = Anope::CurTime;
|
|
Log() << "os_dns: Warning! There are no pooled servers!";
|
|
}
|
|
|
|
/* Something messed up, just return them all and hope one is available */
|
|
for (unsigned i = 0; i < dns_servers.size(); ++i)
|
|
{
|
|
DNSServer *s = dns_servers[i];
|
|
|
|
for (unsigned j = 0; j < s->GetIPs().size(); ++j)
|
|
{
|
|
QueryType q_type = s->GetIPs()[j].find(':') != Anope::string::npos ? DNS_QUERY_AAAA : DNS_QUERY_A;
|
|
|
|
if (q.type == DNS_QUERY_AXFR || q_type == q.type)
|
|
{
|
|
ResourceRecord rr(q.name, q_type);
|
|
rr.ttl = this->ttl;
|
|
rr.rdata = s->GetIPs()[j];
|
|
packet->answers.push_back(rr);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (packet->answers.empty())
|
|
{
|
|
Log() << "os_dns: Error! There are no servers with any IPs. At all.";
|
|
/* Send back an empty answer anyway */
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
MODULE_INIT(ModuleDNS)
|