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Move DNS handling to a module

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This commit is contained in:
Adam
2012-12-15 01:33:31 -05:00
parent cdec0a3f96
commit dcd34d3728
17 changed files with 1314 additions and 1368 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/config.cpp
-44
View File
@@ -17,7 +17,6 @@
#include "opertype.h"
#include "channels.h"
#include "hashcomp.h"
#include "dns.h"
#ifndef _WIN32
#include <errno.h>
@@ -175,42 +174,6 @@ ServerConfig::ServerConfig()
ModeManager::UpdateDefaultMLock(this);
if (IsFile(this->NameServer))
{
std::ifstream f(this->NameServer.c_str());
Anope::string server;
bool success = false;
while (f.is_open() && getline(f, server.str()))
{
if (server.find("nameserver") == 0)
{
size_t ip = server.find_first_of("123456789");
if (ip != Anope::string::npos)
{
if (server.substr(ip).is_pos_number_only())
{
this->NameServer = server.substr(ip);
Log(LOG_DEBUG) << "Nameserver set to " << this->NameServer;
success = true;
break;
}
}
}
}
if (f.is_open())
f.close();
if (!success)
{
Log() << "Unable to find nameserver, defaulting to 127.0.0.1";
this->NameServer = "127.0.0.1";
}
}
delete DNS::Engine;
DNS::Engine = new DNS::Manager(this->NameServer, this->DNSIP, this->DNSPort);
if (this->CaseMap == "ascii")
Anope::casemap = std::locale(std::locale(), new Anope::ascii_ctype<char>());
else if (this->CaseMap == "rfc1459")
@@ -1262,13 +1225,6 @@ ConfigItems::ConfigItems(ServerConfig *conf)
{"mail", "emailchange_message", "", new ValueContainerString(&conf->MailEmailchangeMessage), DT_STRING | DT_ALLOW_NEWLINE, ValidateMail},
{"mail", "memo_subject", "", new ValueContainerString(&conf->MailMemoSubject), DT_STRING, ValidateMail},
{"mail", "memo_message", "", new ValueContainerString(&conf->MailMemoMessage), DT_STRING | DT_ALLOW_NEWLINE, ValidateMail},
{"dns", "nameserver", "127.0.0.1", new ValueContainerString(&conf->NameServer), DT_STRING, NoValidation},
{"dns", "timeout", "5", new ValueContainerTime(&conf->DNSTimeout), DT_TIME, NoValidation},
{"dns", "ip", "0.0.0.0", new ValueContainerString(&conf->DNSIP), DT_STRING, NoValidation},
{"dns", "port", "53", new ValueContainerInt(&conf->DNSPort), DT_INTEGER, NoValidation},
{"dns", "admin", "admin@example.com", new ValueContainerString(&conf->DNSSOAAdmin), DT_STRING, NoValidation},
{"dns", "nameservers", "ns1.example.com", new ValueContainerString(&conf->DNSSOANS), DT_STRING, NoValidation},
{"dns", "refresh", "3600", new ValueContainerUInt(&conf->DNSSOARefresh), DT_UINTEGER, NoValidation},
{"chanserv", "name", "", new ValueContainerString(&conf->ChanServ), DT_STRING, NoValidation},
{"chanserv", "defaults", "keeptopic secure securefounder signkick", new ValueContainerString(&CSDefaults), DT_STRING, ValidateChanServ},
{"chanserv", "maxregistered", "0", new ValueContainerUInt(&conf->CSMaxReg), DT_UINTEGER, ValidateChanServ},
src/dns.cpp
-963
View File
@@ -1,963 +0,0 @@
/*
*
* (C) 2003-2012 Anope Team
* Contact us at team@anope.org
*
* Please read COPYING and README for further details.
*
* Based on the original code of Epona by Lara.
* Based on the original code of Services by Andy Church.
*
*/
#include "services.h"
#include "anope.h"
#include "dns.h"
#include "sockets.h"
#include "socketengine.h"
#ifndef _WIN32
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#endif
using namespace DNS;
Manager *DNS::Engine = NULL;
Question::Question()
{
this->type = QUERY_NONE;
this->qclass = 0;
}
Question::Question(const Anope::string &n, QueryType t, unsigned short q) : name(n), type(t), qclass(q)
{
}
ResourceRecord::ResourceRecord(const Anope::string &n, QueryType t, unsigned short q) : Question(n, t, q)
{
this->ttl = 0;
this->created = Anope::CurTime;
}
ResourceRecord::ResourceRecord(const Question &q) : Question(q)
{
this->ttl = 0;
this->created = Anope::CurTime;
}
Query::Query()
{
this->error = ERROR_NONE;
}
Query::Query(const Question &q)
{
this->questions.push_back(q);
this->error = ERROR_NONE;
}
Request::Request(const Anope::string &addr, QueryType qt, bool cache, Module *c) : Timer(Config->DNSTimeout), Question(addr, qt), use_cache(cache), id(0), creator(c)
{
if (!DNS::Engine || !DNS::Engine->udpsock)
throw SocketException("No DNS::Engine");
if (DNS::Engine->udpsock->GetPackets().size() == 65535)
throw SocketException("DNS queue full");
do
{
static unsigned short cur_id = rand();
this->id = cur_id++;
}
while (DNS::Engine->requests.count(this->id));
DNS::Engine->requests[this->id] = this;
}
Request::~Request()
{
DNS::Engine->requests.erase(this->id);
}
void Request::Process()
{
Log(LOG_DEBUG_2) << "Resolver: Processing request to lookup " << this->name << ", of type " << this->type;
if (!DNS::Engine || !DNS::Engine->udpsock)
throw SocketException("DNS::Engine has not been initialized");
if (this->use_cache && DNS::Engine->CheckCache(this))
{
Log(LOG_DEBUG_2) << "Resolver: Using cached result";
delete this;
return;
}
Packet *p = new Packet(&DNS::Engine->addrs);
p->flags = QUERYFLAGS_RD;
p->id = this->id;
p->questions.push_back(*this);
DNS::Engine->udpsock->Reply(p);
}
void Request::OnError(const Query *r)
{
}
void Request::Tick(time_t)
{
Log(LOG_DEBUG_2) << "Resolver: timeout for query " << this->name;
Query rr(*this);
rr.error = ERROR_TIMEOUT;
this->OnError(&rr);
}
void Packet::PackName(unsigned char *output, unsigned short output_size, unsigned short &pos, const Anope::string &name)
{
if (name.length() + 2 > output_size)
throw SocketException("Unable to pack name");
Log(LOG_DEBUG_2) << "Resolver: PackName packing " << name;
sepstream sep(name, '.');
Anope::string token;
while (sep.GetToken(token))
{
output[pos++] = token.length();
memcpy(&output[pos], token.c_str(), token.length());
pos += token.length();
}
output[pos++] = 0;
}
Anope::string Packet::UnpackName(const unsigned char *input, unsigned short input_size, unsigned short &pos)
{
Anope::string name;
unsigned short pos_ptr = pos, lowest_ptr = input_size;
bool compressed = false;
if (pos_ptr >= input_size)
throw SocketException("Unable to unpack name - no input");
while (input[pos_ptr] > 0)
{
unsigned short offset = input[pos_ptr];
if (offset & POINTER)
{
if ((offset & POINTER) != POINTER)
throw SocketException("Unable to unpack name - bogus compression header");
if (pos_ptr + 1 >= input_size)
throw SocketException("Unable to unpack name - bogus compression header");
/* Place pos at the second byte of the first (farthest) compression pointer */
if (compressed == false)
{
++pos;
compressed = true;
}
pos_ptr = (offset & LABEL) << 8 | input[pos_ptr + 1];
/* Pointers can only go back */
if (pos_ptr >= lowest_ptr)
throw SocketException("Unable to unpack name - bogus compression pointer");
lowest_ptr = pos_ptr;
}
else
{
if (pos_ptr + offset + 1 >= input_size)
throw SocketException("Unable to unpack name - offset too large");
if (!name.empty())
name += ".";
for (unsigned i = 1; i <= offset; ++i)
name += input[pos_ptr + i];
pos_ptr += offset + 1;
if (compressed == false)
/* Move up pos */
pos = pos_ptr;
}
}
/* +1 pos either to one byte after the compression pointer or one byte after the ending \0 */
++pos;
Log(LOG_DEBUG_2) << "Resolver: UnpackName successfully unpacked " << name;
return name;
}
Question Packet::UnpackQuestion(const unsigned char *input, unsigned short input_size, unsigned short &pos)
{
Question question;
question.name = this->UnpackName(input, input_size, pos);
if (pos + 4 > input_size)
throw SocketException("Unable to unpack question");
question.type = static_cast<QueryType>(input[pos] << 8 | input[pos + 1]);
pos += 2;
question.qclass = input[pos] << 8 | input[pos + 1];
pos += 2;
return question;
}
ResourceRecord Packet::UnpackResourceRecord(const unsigned char *input, unsigned short input_size, unsigned short &pos)
{
ResourceRecord record = static_cast<ResourceRecord>(this->UnpackQuestion(input, input_size, pos));
if (pos + 6 > input_size)
throw SocketException("Unable to unpack resource record");
record.ttl = (input[pos] << 24) | (input[pos + 1] << 16) | (input[pos + 2] << 8) | input[pos + 3];
pos += 4;
//record.rdlength = input[pos] << 8 | input[pos + 1];
pos += 2;
switch (record.type)
{
case QUERY_A:
{
if (pos + 4 > input_size)
throw SocketException("Unable to unpack resource record");
in_addr a;
a.s_addr = input[pos] | (input[pos + 1] << 8) | (input[pos + 2] << 16) | (input[pos + 3] << 24);
pos += 4;
sockaddrs addrs;
addrs.ntop(AF_INET, &a);
record.rdata = addrs.addr();
break;
}
case QUERY_AAAA:
{
if (pos + 16 > input_size)
throw SocketException("Unable to unpack resource record");
in6_addr a;
for (int j = 0; j < 16; ++j)
a.s6_addr[j] = input[pos + j];
pos += 16;
sockaddrs addrs;
addrs.ntop(AF_INET6, &a);
record.rdata = addrs.addr();
break;
}
case QUERY_CNAME:
case QUERY_PTR:
{
record.rdata = this->UnpackName(input, input_size, pos);
break;
}
default:
break;
}
Log(LOG_DEBUG_2) << "Resolver: " << record.name << " -> " << record.rdata;
return record;
}
Packet::Packet(sockaddrs *a) : Query(), id(0), flags(0)
{
if (a)
addr = *a;
}
void Packet::Fill(const unsigned char *input, const unsigned short len)
{
if (len < Packet::HEADER_LENGTH)
throw SocketException("Unable to fill packet");
unsigned short packet_pos = 0;
this->id = (input[packet_pos] << 8) | input[packet_pos + 1];
packet_pos += 2;
this->flags = (input[packet_pos] << 8) | input[packet_pos + 1];
packet_pos += 2;
unsigned short qdcount = (input[packet_pos] << 8) | input[packet_pos + 1];
packet_pos += 2;
unsigned short ancount = (input[packet_pos] << 8) | input[packet_pos + 1];
packet_pos += 2;
unsigned short nscount = (input[packet_pos] << 8) | input[packet_pos + 1];
packet_pos += 2;
unsigned short arcount = (input[packet_pos] << 8) | input[packet_pos + 1];
packet_pos += 2;
Log(LOG_DEBUG_2) << "Resolver: qdcount: " << qdcount << " ancount: " << ancount << " nscount: " << nscount << " arcount: " << arcount;
for (unsigned i = 0; i < qdcount; ++i)
this->questions.push_back(this->UnpackQuestion(input, len, packet_pos));
for (unsigned i = 0; i < ancount; ++i)
this->answers.push_back(this->UnpackResourceRecord(input, len, packet_pos));
for (unsigned i = 0; i < nscount; ++i)
this->authorities.push_back(this->UnpackResourceRecord(input, len, packet_pos));
for (unsigned i = 0; i < arcount; ++i)
this->additional.push_back(this->UnpackResourceRecord(input, len, packet_pos));
}
unsigned short Packet::Pack(unsigned char *output, unsigned short output_size)
{
if (output_size < Packet::HEADER_LENGTH)
throw SocketException("Unable to pack packet");
unsigned short pos = 0;
output[pos++] = this->id >> 8;
output[pos++] = this->id & 0xFF;
output[pos++] = this->flags >> 8;
output[pos++] = this->flags & 0xFF;
output[pos++] = this->questions.size() >> 8;
output[pos++] = this->questions.size() & 0xFF;
output[pos++] = this->answers.size() >> 8;
output[pos++] = this->answers.size() & 0xFF;
output[pos++] = this->authorities.size() >> 8;
output[pos++] = this->authorities.size() & 0xFF;
output[pos++] = this->additional.size() >> 8;
output[pos++] = this->additional.size() & 0xFF;
for (unsigned i = 0; i < this->questions.size(); ++i)
{
Question &q = this->questions[i];
if (q.type == QUERY_PTR)
{
sockaddrs ip(q.name);
if (q.name.find(':') != Anope::string::npos)
{
static const char *const hex = "0123456789abcdef";
char reverse_ip[128];
unsigned reverse_ip_count = 0;
for (int j = 15; j >= 0; --j)
{
reverse_ip[reverse_ip_count++] = hex[ip.sa6.sin6_addr.s6_addr[j] & 0xF];
reverse_ip[reverse_ip_count++] = '.';
reverse_ip[reverse_ip_count++] = hex[ip.sa6.sin6_addr.s6_addr[j] >> 4];
reverse_ip[reverse_ip_count++] = '.';
}
reverse_ip[reverse_ip_count++] = 0;
q.name = reverse_ip;
q.name += "ip6.arpa";
}
else
{
unsigned long forward = ip.sa4.sin_addr.s_addr;
in_addr reverse;
reverse.s_addr = forward << 24 | (forward & 0xFF00) << 8 | (forward & 0xFF0000) >> 8 | forward >> 24;
ip.ntop(AF_INET, &reverse);
q.name = ip.addr() + ".in-addr.arpa";
}
}
this->PackName(output, output_size, pos, q.name);
if (pos + 4 >= output_size)
throw SocketException("Unable to pack packet");
short s = htons(q.type);
memcpy(&output[pos], &s, 2);
pos += 2;
s = htons(q.qclass);
memcpy(&output[pos], &s, 2);
pos += 2;
}
std::vector<ResourceRecord> types[] = { this->answers, this->authorities, this->additional };
for (int i = 0; i < 3; ++i)
for (unsigned j = 0; j < types[i].size(); ++j)
{
ResourceRecord &rr = types[i][j];
this->PackName(output, output_size, pos, rr.name);
if (pos + 8 >= output_size)
throw SocketException("Unable to pack packet");
short s = htons(rr.type);
memcpy(&output[pos], &s, 2);
pos += 2;
s = htons(rr.qclass);
memcpy(&output[pos], &s, 2);
pos += 2;
long l = htonl(rr.ttl);
memcpy(&output[pos], &l, 4);
pos += 4;
switch (rr.type)
{
case QUERY_A:
{
if (pos + 6 > output_size)
throw SocketException("Unable to pack packet");
sockaddrs a(rr.rdata);
s = htons(4);
memcpy(&output[pos], &s, 2);
pos += 2;
memcpy(&output[pos], &a.sa4.sin_addr, 4);
pos += 4;
break;
}
case QUERY_AAAA:
{
if (pos + 18 > output_size)
throw SocketException("Unable to pack packet");
sockaddrs a(rr.rdata);
s = htons(16);
memcpy(&output[pos], &s, 2);
pos += 2;
memcpy(&output[pos], &a.sa6.sin6_addr, 16);
pos += 16;
break;
}
case QUERY_NS:
case QUERY_CNAME:
case QUERY_PTR:
{
if (pos + 2 >= output_size)
throw SocketException("Unable to pack packet");
unsigned short packet_pos_save = pos;
pos += 2;
this->PackName(output, output_size, pos, rr.rdata);
s = htons(pos - packet_pos_save - 2);
memcpy(&output[packet_pos_save], &s, 2);
break;
}
case QUERY_SOA:
{
if (pos + 2 >= output_size)
throw SocketException("Unable to pack packet");
unsigned short packet_pos_save = pos;
pos += 2;
std::vector<Anope::string> nameservers;
spacesepstream(Config->DNSSOANS).GetTokens(nameservers);
this->PackName(output, output_size, pos, !nameservers.empty() ? nameservers[0] : "");
this->PackName(output, output_size, pos, Config->DNSSOAAdmin.replace_all_cs('@', '.'));
if (pos + 20 >= output_size)
throw SocketException("Unable to pack SOA");
l = htonl(DNS::Engine->GetSerial());
memcpy(&output[pos], &l, 4);
pos += 4;
l = htonl(Config->DNSSOARefresh); // Refresh
memcpy(&output[pos], &l, 4);
pos += 4;
l = htonl(Config->DNSSOARefresh); // Retry
memcpy(&output[pos], &l, 4);
pos += 4;
l = htonl(604800); // Expire
memcpy(&output[pos], &l, 4);
pos += 4;
l = htonl(0); // Minimum
memcpy(&output[pos], &l, 4);
pos += 4;
s = htons(pos - packet_pos_save - 2);
memcpy(&output[packet_pos_save], &s, 2);
break;
}
default:
break;
}
}
return pos;
}
Manager::TCPSocket::Client::Client(TCPSocket *l, int fd, const sockaddrs &addr) : Socket(fd, l->IsIPv6()), ClientSocket(l, addr), Timer(5), tcpsock(l), packet(NULL), length(0)
{
Log(LOG_DEBUG_2) << "Resolver: New client from " << addr.addr();
}
Manager::TCPSocket::Client::~Client()
{
Log(LOG_DEBUG_2) << "Resolver: Exiting client from " << clientaddr.addr();
delete packet;
}
void Manager::TCPSocket::Client::Reply(Packet *p)
{
delete packet;
packet = p;
SocketEngine::Change(this, true, SF_WRITABLE);
}
bool Manager::TCPSocket::Client::ProcessRead()
{
Log(LOG_DEBUG_2) << "Resolver: Reading from DNS TCP socket";
int i = recv(this->GetFD(), reinterpret_cast<char *>(packet_buffer) + length, sizeof(packet_buffer) - length, 0);
if (i <= 0)
return false;
length += i;
unsigned short want_len = packet_buffer[0] << 8 | packet_buffer[1];
if (length >= want_len + 2)
{
int len = length - 2;
length -= want_len + 2;
return DNS::Engine->HandlePacket(this, packet_buffer + 2, len, NULL);
}
return true;
}
bool Manager::TCPSocket::Client::ProcessWrite()
{
Log(LOG_DEBUG_2) << "Resolver: Writing to DNS TCP socket";
if (packet != NULL)
{
try
{
unsigned char buffer[65535];
unsigned short len = packet->Pack(buffer + 2, sizeof(buffer) - 2);
short s = htons(len);
memcpy(buffer, &s, 2);
len += 2;
send(this->GetFD(), reinterpret_cast<char *>(buffer), len, 0);
}
catch (const SocketException &) { }
delete packet;
packet = NULL;
}
SocketEngine::Change(this, false, SF_WRITABLE);
return true; /* Do not return false here, bind is unhappy we close the connection so soon after sending */
}
Manager::TCPSocket::TCPSocket(const Anope::string &ip, int port) : Socket(-1, ip.find(':') != Anope::string::npos), ListenSocket(ip, port, ip.find(':') != Anope::string::npos)
{
}
ClientSocket *Manager::TCPSocket::OnAccept(int fd, const sockaddrs &addr)
{
return new Client(this, fd, addr);
}
Manager::UDPSocket::UDPSocket(const Anope::string &ip, int port) : Socket(-1, ip.find(':') != Anope::string::npos, SOCK_DGRAM)
{
}
Manager::UDPSocket::~UDPSocket()
{
for (unsigned i = 0; i < packets.size(); ++i)
delete packets[i];
}
void Manager::UDPSocket::Reply(Packet *p)
{
packets.push_back(p);
SocketEngine::Change(this, true, SF_WRITABLE);
}
bool Manager::UDPSocket::ProcessRead()
{
Log(LOG_DEBUG_2) << "Resolver: Reading from DNS UDP socket";
unsigned char packet_buffer[524];
sockaddrs from_server;
socklen_t x = sizeof(from_server);
int length = recvfrom(this->GetFD(), reinterpret_cast<char *>(&packet_buffer), sizeof(packet_buffer), 0, &from_server.sa, &x);
return DNS::Engine->HandlePacket(this, packet_buffer, length, &from_server);
}
bool Manager::UDPSocket::ProcessWrite()
{
Log(LOG_DEBUG_2) << "Resolver: Writing to DNS UDP socket";
Packet *r = !packets.empty() ? packets.front() : NULL;
if (r != NULL)
{
try
{
unsigned char buffer[524];
unsigned short len = r->Pack(buffer, sizeof(buffer));
sendto(this->GetFD(), reinterpret_cast<char *>(buffer), len, 0, &r->addr.sa, r->addr.size());
}
catch (const SocketException &) { }
delete r;
packets.pop_front();
}
if (packets.empty())
SocketEngine::Change(this, false, SF_WRITABLE);
return true;
}
Manager::Manager(const Anope::string &nameserver, const Anope::string &ip, int port) : Timer(300, Anope::CurTime, true), listen(false), serial(0), tcpsock(NULL), udpsock(NULL)
{
this->addrs.pton(nameserver.find(':') != Anope::string::npos ? AF_INET6 : AF_INET, nameserver, port);
try
{
udpsock = new UDPSocket(ip, port);
}
catch (const SocketException &ex)
{
Log() << "Unable to create socket for Manager: " << ex.GetReason();
}
try
{
udpsock->Bind(ip, port);
tcpsock = new TCPSocket(ip, port);
listen = true;
}
catch (const SocketException &ex)
{
/* This error can be from normal operation as most people don't use services to handle DNS queries, so put it in debug log */
Log(LOG_DEBUG) << "Unable to bind Manager to port " << port << ": " << ex.GetReason();
}
this->UpdateSerial();
}
Manager::~Manager()
{
delete udpsock;
delete tcpsock;
for (std::map<unsigned short, Request *>::iterator it = this->requests.begin(), it_end = this->requests.end(); it != it_end; ++it)
{
Request *request = it->second;
Query rr(*request);
rr.error = ERROR_UNKNOWN;
request->OnError(&rr);
delete request;
}
this->requests.clear();
this->cache.clear();
DNS::Engine = NULL;
}
bool Manager::HandlePacket(ReplySocket *s, const unsigned char *const packet_buffer, int length, sockaddrs *from)
{
if (length < Packet::HEADER_LENGTH)
return true;
Packet recv_packet(from);
try
{
recv_packet.Fill(packet_buffer, length);
}
catch (const SocketException &ex)
{
Log(LOG_DEBUG_2) << ex.GetReason();
return true;
}
if (!(recv_packet.flags & QUERYFLAGS_QR))
{
if (!listen)
return true;
else if (recv_packet.questions.empty())
{
Log(LOG_DEBUG_2) << "Resolver: Received a question with no questions?";
return true;
}
Packet *packet = new Packet(recv_packet);
packet->flags |= QUERYFLAGS_QR; /* This is a reponse */
packet->flags |= QUERYFLAGS_AA; /* And we are authoritative */
packet->answers.clear();
packet->authorities.clear();
packet->additional.clear();
for (unsigned i = 0; i < recv_packet.questions.size(); ++i)
{
const Question& q = recv_packet.questions[i];
if (q.type == QUERY_AXFR || q.type == QUERY_SOA)
{
ResourceRecord rr(q.name, QUERY_SOA);
packet->answers.push_back(rr);
if (q.type == QUERY_AXFR)
{
Anope::string token;
spacesepstream sep(Config->DNSSOANS);
while (sep.GetToken(token))
{
ResourceRecord rr2(q.name, QUERY_NS);
rr2.rdata = token;
packet->answers.push_back(rr2);
}
}
break;
}
}
FOREACH_MOD(I_OnDnsRequest, OnDnsRequest(recv_packet, packet));
for (unsigned i = 0; i < recv_packet.questions.size(); ++i)
{
const Question& q = recv_packet.questions[i];
if (q.type == QUERY_AXFR)
{
ResourceRecord rr(q.name, QUERY_SOA);
packet->answers.push_back(rr);
break;
}
}
s->Reply(packet);
return true;
}
if (from == NULL)
{
Log(LOG_DEBUG_2) << "Resolver: Received an answer over TCP. This is not supported.";
return true;
}
else if (this->addrs != *from)
{
Log(LOG_DEBUG_2) << "Resolver: Received an answer from the wrong nameserver, Bad NAT or DNS forging attempt? '" << this->addrs.addr() << "' != '" << from->addr() << "'";
return true;
}
std::map<unsigned short, Request *>::iterator it = DNS::Engine->requests.find(recv_packet.id);
if (it == DNS::Engine->requests.end())
{
Log(LOG_DEBUG_2) << "Resolver: Received an answer for something we didn't request";
return true;
}
Request *request = it->second;
if (recv_packet.flags & QUERYFLAGS_OPCODE)
{
Log(LOG_DEBUG_2) << "Resolver: Received a nonstandard query";
recv_packet.error = ERROR_NONSTANDARD_QUERY;
request->OnError(&recv_packet);
}
else if (recv_packet.flags & QUERYFLAGS_RCODE)
{
Error error = ERROR_UNKNOWN;
switch (recv_packet.flags & QUERYFLAGS_RCODE)
{
case 1:
Log(LOG_DEBUG_2) << "Resolver: format error";
error = ERROR_FORMAT_ERROR;
break;
case 2:
Log(LOG_DEBUG_2) << "Resolver: server error";
error = ERROR_SERVER_FAILURE;
break;
case 3:
Log(LOG_DEBUG_2) << "Resolver: domain not found";
error = ERROR_DOMAIN_NOT_FOUND;
break;
case 4:
Log(LOG_DEBUG_2) << "Resolver: not implemented";
error = ERROR_NOT_IMPLEMENTED;
break;
case 5:
Log(LOG_DEBUG_2) << "Resolver: refused";
error = ERROR_REFUSED;
break;
default:
break;
}
recv_packet.error = error;
request->OnError(&recv_packet);
}
else if (recv_packet.answers.empty())
{
Log(LOG_DEBUG_2) << "Resolver: No resource records returned";
recv_packet.error = ERROR_NO_RECORDS;
request->OnError(&recv_packet);
}
else
{
Log(LOG_DEBUG_2) << "Resolver: Lookup complete for " << request->name;
request->OnLookupComplete(&recv_packet);
DNS::Engine->AddCache(recv_packet);
}
delete request;
return true;
}
void Manager::AddCache(Query &r)
{
for (unsigned i = 0; i < r.answers.size(); ++i)
{
ResourceRecord &rr = r.answers[i];
Log(LOG_DEBUG_3) << "Resolver cache: added cache for " << rr.name << " -> " << rr.rdata << ", ttl: " << rr.ttl;
this->cache.insert(std::make_pair(rr.name, rr));
}
}
bool Manager::CheckCache(Request *request)
{
cache_map::iterator it = this->cache.find(request->name);
if (it != this->cache.end())
{
Query record(*request);
for (cache_map::iterator it_end = this->cache.upper_bound(request->name); it != it_end; ++it)
{
ResourceRecord &rec = it->second;
if (rec.created + static_cast<time_t>(rec.ttl) >= Anope::CurTime)
record.answers.push_back(rec);
}
if (!record.answers.empty())
{
Log(LOG_DEBUG_3) << "Resolver: Using cached result for " << request->name;
request->OnLookupComplete(&record);
return true;
}
}
return false;
}
void Manager::Tick(time_t now)
{
Log(LOG_DEBUG_2) << "Resolver: Purging DNS cache";
for (cache_map::iterator it = this->cache.begin(), it_next; it != this->cache.end(); it = it_next)
{
ResourceRecord &req = it->second;
it_next = it;
++it_next;
if (req.created + static_cast<time_t>(req.ttl) < now)
this->cache.erase(it);
}
}
void Manager::Cleanup(Module *mod)
{
for (std::map<unsigned short, Request *>::iterator it = this->requests.begin(), it_end = this->requests.end(); it != it_end;)
{
unsigned short id = it->first;
Request *req = it->second;
++it;
if (req->creator && req->creator == mod)
{
Query rr(*req);
rr.error = ERROR_UNLOADED;
req->OnError(&rr);
delete req;
this->requests.erase(id);
}
}
}
void Manager::UpdateSerial()
{
serial = Anope::CurTime;
}
uint32_t Manager::GetSerial() const
{
return serial;
}
Query Manager::BlockingQuery(const Anope::string &mask, QueryType qt)
{
Question question(mask, qt);
Query result(question);
int type = AF_UNSPEC;
if (qt == QUERY_A)
type = AF_INET;
else if (qt == QUERY_AAAA)
type = AF_INET6;
addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = type;
Log(LOG_DEBUG_2) << "Resolver: BlockingQuery: Looking up " << mask;
addrinfo *addrresult;
if (getaddrinfo(mask.c_str(), NULL, &hints, &addrresult) == 0)
{
for (addrinfo *cur = addrresult; cur; cur = cur->ai_next)
{
sockaddrs addr;
memcpy(&addr, addrresult->ai_addr, addrresult->ai_addrlen);
try
{
ResourceRecord rr(mask, qt);
rr.rdata = addr.addr();
result.answers.push_back(rr);
Log(LOG_DEBUG_2) << "Resolver: BlockingQuery: " << mask << " -> " << rr.rdata;
}
catch (const SocketException &) { }
}
freeaddrinfo(addrresult);
}
return result;
}
src/misc.cpp
+31
View File
@@ -18,10 +18,13 @@
#include "bots.h"
#include "language.h"
#include "regexpr.h"
#include "sockets.h"
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netdb.h>
NumberList::NumberList(const Anope::string &list, bool descending) : is_valid(true), desc(descending)
{
@@ -652,3 +655,31 @@ Anope::string Anope::NormalizeBuffer(const Anope::string &buf)
return newbuf;
}
Anope::string Anope::Resolve(const Anope::string &host, int type)
{
Anope::string result = host;
addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = type;
Log(LOG_DEBUG_2) << "Resolver: BlockingQuery: Looking up " << host;
addrinfo *addrresult = NULL;
if (getaddrinfo(host.c_str(), NULL, &hints, &addrresult) == 0)
{
sockaddrs addr;
memcpy(&addr, addrresult->ai_addr, addrresult->ai_addrlen);
try
{
result = addr.addr();
Log(LOG_DEBUG_2) << "Resolver: " << host << " -> " << result;
}
catch (const SocketException &) { }
freeaddrinfo(addrresult);
}
return result;
}
src/module.cpp
+1 -3
View File
@@ -9,8 +9,8 @@
#include "services.h"
#include "modules.h"
#include "dns.h"
#include "language.h"
#include "account.h"
#ifdef GETTEXT_FOUND
# include <libintl.h>
@@ -46,8 +46,6 @@ Module::Module(const Anope::string &modname, const Anope::string &, ModType modt
Module::~Module()
{
if (DNS::Engine)
DNS::Engine->Cleanup(this);
/* Detach all event hooks for this module */
ModuleManager::DetachAll(this);
/* Clear any active callbacks this module has */
src/uplink.cpp
+3 -5
View File
@@ -15,7 +15,6 @@
#include "config.h"
#include "protocol.h"
#include "servers.h"
#include "dns.h"
UplinkSocket *UplinkSock = NULL;
@@ -48,10 +47,9 @@ void Uplink::Connect()
if (!Config->LocalHost.empty())
UplinkSock->Bind(Config->LocalHost);
FOREACH_MOD(I_OnPreServerConnect, OnPreServerConnect());
DNS::Query rep = DNS::Manager::BlockingQuery(u->host, u->ipv6 ? DNS::QUERY_AAAA : DNS::QUERY_A);
Anope::string reply_ip = !rep.answers.empty() ? rep.answers.front().rdata : u->host;
Log(LOG_TERMINAL) << "Attempting to connect to uplink #" << (Anope::CurrentUplink + 1) << " " << u->host << " (" << reply_ip << "), port " << u->port;
UplinkSock->Connect(reply_ip, u->port);
Anope::string ip = Anope::Resolve(u->host, u->ipv6 ? AF_INET6 : AF_INET);
Log(LOG_TERMINAL) << "Attempting to connect to uplink #" << (Anope::CurrentUplink + 1) << " " << u->host << " (" << ip << "), port " << u->port;
UplinkSock->Connect(ip, u->port);
}