mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-10-29 11:05:43 +00:00
688 lines
20 KiB
C++
688 lines
20 KiB
C++
#include <algorithm>
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// harmless on other platforms
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#define __USE_MINGW_ANSI_STDIO 1
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#include <handlers/tun.hpp>
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#include <sys/types.h>
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#ifndef _WIN32
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#include <sys/socket.h>
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#include <netdb.h>
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#endif
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#include <dns/dns.hpp>
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#include <ev/ev.hpp>
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#include <router.hpp>
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namespace llarp
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{
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namespace handlers
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{
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static llarp_fd_promise *
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get_tun_fd_promise(llarp_tun_io *tun)
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{
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return static_cast< TunEndpoint * >(tun->user)->Promise.get();
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}
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static void
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tunifTick(llarp_tun_io *tun)
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{
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TunEndpoint *self = static_cast< TunEndpoint * >(tun->user);
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self->Flush();
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}
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TunEndpoint::TunEndpoint(const std::string &nickname, llarp::Router *r)
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: service::Endpoint(nickname, r)
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, m_UserToNetworkPktQueue(nickname + "_sendq", r->netloop, r->netloop)
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, m_NetworkToUserPktQueue(nickname + "_recvq", r->netloop, r->netloop)
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, m_Resolver(r->netloop, this)
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{
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#ifdef ANDROID
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tunif.get_fd_promise = &get_tun_fd_promise;
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Promise.reset(new llarp_fd_promise(&m_VPNPromise));
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#else
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tunif.get_fd_promise = nullptr;
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#endif
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tunif.user = this;
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tunif.netmask = DefaultTunNetmask;
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// eh this shouldn't do anything on windows anyway
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strncpy(tunif.ifaddr, DefaultTunSrcAddr, sizeof(tunif.ifaddr) - 1);
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strncpy(tunif.ifname, DefaultTunIfname, sizeof(tunif.ifname) - 1);
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tunif.tick = &tunifTick;
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tunif.before_write = &tunifBeforeWrite;
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tunif.recvpkt = &tunifRecvPkt;
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}
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bool
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TunEndpoint::SetOption(const std::string &k, const std::string &v)
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{
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if(k == "exit-node")
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{
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llarp::RouterID exitRouter;
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if(!(exitRouter.FromString(v)
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|| HexDecode(v.c_str(), exitRouter.begin(), exitRouter.size())))
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{
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llarp::LogError(Name(), " bad exit router key: ", v);
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return false;
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}
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m_Exit.reset(new llarp::exit::ExitSession(
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exitRouter,
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std::bind(&TunEndpoint::QueueInboundPacketForExit, this,
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std::placeholders::_1),
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router, m_NumPaths, numHops));
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llarp::LogInfo(Name(), " using exit at ", exitRouter);
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}
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if(k == "local-dns")
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{
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std::string resolverAddr = v;
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uint16_t dnsport = 53;
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auto pos = v.find(":");
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if(pos != std::string::npos)
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{
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resolverAddr = v.substr(0, pos);
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dnsport = std::atoi(v.substr(pos + 1).c_str());
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}
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m_LocalResolverAddr = llarp::Addr(resolverAddr, dnsport);
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llarp::LogInfo(Name(), " local dns set to ", m_LocalResolverAddr);
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}
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if(k == "upstream-dns")
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{
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std::string resolverAddr = v;
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uint16_t dnsport = 53;
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auto pos = v.find(":");
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if(pos != std::string::npos)
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{
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resolverAddr = v.substr(0, pos);
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dnsport = std::atoi(v.substr(pos + 1).c_str());
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}
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m_UpstreamResolvers.emplace_back(resolverAddr, dnsport);
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llarp::LogInfo(Name(), " adding upstream dns set to ", resolverAddr,
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":", dnsport);
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}
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if(k == "mapaddr")
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{
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auto pos = v.find(":");
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if(pos == std::string::npos)
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{
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llarp::LogError("Cannot map address ", v,
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" invalid format, missing colon (:), expects "
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"address.loki:ip.address.goes.here");
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return false;
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}
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service::Address addr;
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auto addr_str = v.substr(0, pos);
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if(!addr.FromString(addr_str))
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{
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llarp::LogError(Name() + " cannot map invalid address ", addr_str);
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return false;
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}
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auto ip_str = v.substr(pos + 1);
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in_addr ip;
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if(inet_pton(AF_INET, ip_str.c_str(), &ip) != 1)
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{
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llarp::LogError("cannot map to invalid ip ", ip_str);
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return false;
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}
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return MapAddress(addr, huint32_t{ntohl(ip.s_addr)}, false);
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}
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if(k == "ifname")
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{
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if(v.length() >= sizeof(tunif.ifname))
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{
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llarp::LogError(Name() + " ifname '", v, "' is too long");
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return false;
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}
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strncpy(tunif.ifname, v.c_str(), sizeof(tunif.ifname) - 1);
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llarp::LogInfo(Name() + " setting ifname to ", tunif.ifname);
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return true;
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}
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if(k == "ifaddr")
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{
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std::string addr;
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auto pos = v.find("/");
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if(pos != std::string::npos)
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{
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int num;
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std::string part = v.substr(pos + 1);
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#if defined(ANDROID) || defined(RPI)
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num = atoi(part.c_str());
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#else
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num = std::stoi(part);
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#endif
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if(num > 0)
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{
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tunif.netmask = num;
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addr = v.substr(0, pos);
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}
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else
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{
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llarp::LogError("bad ifaddr value: ", v);
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return false;
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}
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}
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else
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{
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tunif.netmask = 32;
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addr = v;
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}
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llarp::LogInfo(Name() + " set ifaddr to ", addr, " with netmask ",
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tunif.netmask);
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strncpy(tunif.ifaddr, addr.c_str(), sizeof(tunif.ifaddr) - 1);
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return true;
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}
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return Endpoint::SetOption(k, v);
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}
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bool
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TunEndpoint::HasLocalIP(const huint32_t &ip) const
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{
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return m_IPToAddr.find(ip) != m_IPToAddr.end();
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}
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bool
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TunEndpoint::QueueOutboundTraffic(llarp::net::IPv4Packet &&pkt)
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{
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return m_NetworkToUserPktQueue.EmplaceIf(
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[](llarp::net::IPv4Packet &) -> bool { return true; },
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std::move(pkt));
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}
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void
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TunEndpoint::Flush()
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{
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FlushSend();
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}
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bool
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TunEndpoint::HandleHookedDNSMessage(
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dns::Message &&msg, std::function< void(dns::Message) > reply)
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{
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if(msg.questions.size() != 1)
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{
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llarp::LogWarn("bad number of dns questions: ", msg.questions.size());
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return false;
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}
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std::string qname = msg.questions[0].qname;
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if(msg.questions[0].qtype == 15)
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{
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// mx record
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llarp::service::Address addr;
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if(addr.FromString(qname, ".loki"))
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msg.AddMXReply(qname, 1);
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else
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msg.AddNXReply();
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reply(msg);
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}
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else if(msg.questions[0].qtype == 1)
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{
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// forward dns
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llarp::service::Address addr;
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if(qname == "random.snode" || qname == "random.snode.")
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{
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RouterID random;
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if(Router()->GetRandomGoodRouter(random))
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msg.AddCNAMEReply(random.ToString(), 1);
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else
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msg.AddNXReply();
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}
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else if(addr.FromString(qname, ".loki"))
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{
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if(HasAddress(addr))
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{
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huint32_t ip = ObtainIPForAddr(addr, false);
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msg.AddINReply(ip);
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}
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else
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{
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service::Endpoint::PathEnsureHook hook = [&](service::Address addr,
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OutboundContext *ctx) {
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this->SendDNSReply(addr, ctx, std::move(msg), reply);
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};
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return EnsurePathToService(addr, hook, 2000);
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}
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}
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else if(addr.FromString(qname, ".snode"))
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{
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// TODO: add hook to EnsurePathToSNode
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EnsurePathToSNode(addr.as_array());
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huint32_t ip = ObtainIPForAddr(addr, true);
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msg.AddINReply(ip);
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}
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else
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msg.AddNXReply();
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reply(msg);
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}
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else if(msg.questions[0].qtype == 12)
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{
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// reverse dns
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huint32_t ip = {0};
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if(!dns::DecodePTR(msg.questions[0].qname, ip))
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{
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msg.AddNXReply();
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reply(msg);
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return true;
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}
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llarp::service::Address addr(
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ObtainAddrForIP< llarp::service::Address >(ip, true));
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if(!addr.IsZero())
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{
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msg.AddAReply(addr.ToString(".snode"));
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reply(msg);
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return true;
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}
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addr = ObtainAddrForIP< llarp::service::Address >(ip, false);
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if(!addr.IsZero())
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{
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msg.AddAReply(addr.ToString(".loki"));
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reply(msg);
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return true;
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}
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msg.AddNXReply();
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reply(msg);
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return true;
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}
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else
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{
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msg.AddNXReply();
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reply(msg);
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}
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return true;
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}
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bool
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TunEndpoint::ShouldHookDNSMessage(const dns::Message &msg) const
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{
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llarp::service::Address addr;
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if(msg.questions.size() == 1)
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{
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// always hook mx records
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if(msg.questions[0].qtype == llarp::dns::qTypeMX)
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return true;
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if(msg.questions[0].qname == "random.snode"
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|| msg.questions[0].qname == "random.snode.")
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return true;
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// always hook .loki
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if(addr.FromString(msg.questions[0].qname, ".loki"))
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return true;
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// always hook .snode
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if(addr.FromString(msg.questions[0].qname, ".snode"))
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return true;
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if(msg.questions[0].qtype == llarp::dns::qTypePTR)
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{
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huint32_t ip = {0};
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if(!dns::DecodePTR(msg.questions[0].qname, ip))
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return false;
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return m_OurRange.Contains(ip);
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}
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}
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return false;
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}
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void
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TunEndpoint::SendDNSReply(service::Address addr,
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service::Endpoint::OutboundContext *ctx,
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dns::Message &&request,
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std::function< void(dns::Message) > reply)
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{
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if(ctx)
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{
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huint32_t ip = ObtainIPForAddr(addr, false);
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request.AddINReply(ip);
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}
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else
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request.AddNXReply();
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reply(request);
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}
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bool
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TunEndpoint::MapAddress(const service::Address &addr, huint32_t ip,
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bool SNode)
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{
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auto itr = m_IPToAddr.find(ip);
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if(itr != m_IPToAddr.end())
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{
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// XXX is calling inet_ntoa safe in this context? it's MP-unsafe
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llarp::LogWarn(ip, " already mapped to ",
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service::Address(itr->second.as_array()).ToString());
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return false;
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}
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llarp::LogInfo(Name() + " map ", addr.ToString(), " to ", ip);
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m_IPToAddr[ip] = addr;
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m_AddrToIP[addr] = ip;
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m_SNodes[addr] = SNode;
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MarkIPActiveForever(ip);
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return true;
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}
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bool
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TunEndpoint::Start()
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{
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if(!Endpoint::Start())
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return false;
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return SetupNetworking();
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}
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bool
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TunEndpoint::IsSNode() const
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{
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// TODO : implement me
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return false;
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}
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bool
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TunEndpoint::SetupTun()
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{
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if(!llarp_ev_add_tun(EndpointNetLoop(), &tunif))
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{
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llarp::LogError(Name(), " failed to set up tun interface");
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return false;
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}
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struct addrinfo hint, *res = NULL;
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int ret;
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memset(&hint, 0, sizeof hint);
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hint.ai_family = PF_UNSPEC;
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hint.ai_flags = AI_NUMERICHOST;
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ret = getaddrinfo(tunif.ifaddr, NULL, &hint, &res);
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if(ret)
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{
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llarp::LogError(Name(),
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" failed to set up tun interface, cant determine "
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"family from ",
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tunif.ifaddr);
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return false;
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}
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/*
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// output is in network byte order
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unsigned char buf[sizeof(struct in6_addr)];
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int s = inet_pton(res->ai_family, tunif.ifaddr, buf);
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if (s <= 0)
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{
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llarp::LogError(Name(), " failed to set up tun interface, cant parse
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", tunif.ifaddr); return false;
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}
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*/
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if(res->ai_family == AF_INET6)
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{
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llarp::LogError(Name(),
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" failed to set up tun interface, we don't support "
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"IPv6 format");
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return false;
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}
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freeaddrinfo(res);
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struct in_addr addr; // network byte order
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if(inet_aton(tunif.ifaddr, &addr) == 0)
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{
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llarp::LogError(Name(), " failed to set up tun interface, cant parse ",
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tunif.ifaddr);
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return false;
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}
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llarp::Addr lAddr(tunif.ifaddr);
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m_OurIP = lAddr.xtohl();
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m_NextIP = m_OurIP;
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m_OurRange.netmask_bits = netmask_ipv4_bits(tunif.netmask);
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m_OurRange.addr = m_OurIP;
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m_MaxIP = m_OurIP | (~m_OurRange.netmask_bits);
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llarp::LogInfo(Name(), " set ", tunif.ifname, " to have address ", lAddr);
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llarp::LogInfo(Name(), " allocated up to ", m_MaxIP, " on range ",
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m_OurRange);
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MapAddress(m_Identity.pub.Addr(), m_OurIP, IsSNode());
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return true;
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}
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bool
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TunEndpoint::SetupNetworking()
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{
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llarp::LogInfo("Set Up networking for ", Name());
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if(!SetupTun())
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{
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llarp::LogError(Name(), " failed to set up network interface");
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return false;
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}
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if(!m_Resolver.Start(m_LocalResolverAddr, m_UpstreamResolvers))
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{
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llarp::LogError(Name(), " failed to start dns server");
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return false;
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}
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return true;
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}
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void
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TunEndpoint::Tick(llarp_time_t now)
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{
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// call tun code in endpoint logic in case of network isolation
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// EndpointLogic()->queue_job({this, handleTickTun});
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if(m_Exit)
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EnsureRouterIsKnown(m_Exit->Endpoint());
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Endpoint::Tick(now);
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}
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bool
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TunEndpoint::Stop()
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{
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if(m_Exit)
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m_Exit->Stop();
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return llarp::service::Endpoint::Stop();
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}
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void
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TunEndpoint::FlushSend()
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{
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m_UserToNetworkPktQueue.Process([&](net::IPv4Packet &pkt) {
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std::function< bool(llarp_buffer_t) > sendFunc;
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auto itr = m_IPToAddr.find(pkt.dst());
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if(itr == m_IPToAddr.end())
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{
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if(m_Exit && !llarp::IsIPv4Bogon(pkt.dst()))
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{
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pkt.UpdateIPv4PacketOnDst({0}, pkt.dst());
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m_Exit->QueueUpstreamTraffic(std::move(pkt),
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llarp::routing::ExitPadSize);
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}
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else
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llarp::LogWarn(Name(), " has no endpoint for ", pkt.dst());
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return true;
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}
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if(m_SNodes.at(itr->second))
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{
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sendFunc = std::bind(&TunEndpoint::SendToSNodeOrQueue, this,
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itr->second.as_array(), std::placeholders::_1);
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}
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else
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{
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sendFunc = std::bind(&TunEndpoint::SendToServiceOrQueue, this,
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itr->second.as_array(), std::placeholders::_1,
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service::eProtocolTraffic);
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}
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// prepare packet for insertion into network
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// this includes clearing IP addresses, recalculating checksums, etc
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pkt.UpdateIPv4PacketOnSrc();
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if(sendFunc && sendFunc(pkt.Buffer()))
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return true;
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llarp::LogWarn(Name(), " did not flush packets");
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return true;
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});
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}
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bool
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TunEndpoint::HandleWriteIPPacket(llarp_buffer_t buf,
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std::function< huint32_t(void) > getFromIP)
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{
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// llarp::LogInfo("got packet from ", msg->sender.Addr());
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auto themIP = getFromIP();
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// llarp::LogInfo("themIP ", themIP);
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auto usIP = m_OurIP;
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return m_NetworkToUserPktQueue.EmplaceIf(
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[buf, themIP, usIP](net::IPv4Packet &pkt) -> bool {
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// load
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if(!pkt.Load(buf))
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return false;
|
|
// filter out:
|
|
// - packets smaller than minimal IPv4 header
|
|
// - non-IPv4 packets
|
|
// - packets with weird src/dst addresses
|
|
// (0.0.0.0/8 but not 0.0.0.0)
|
|
// - packets with 0 src but non-0 dst and oposite
|
|
auto hdr = pkt.Header();
|
|
if(pkt.sz < sizeof(*hdr) || hdr->version != 4
|
|
|| (hdr->saddr != 0 && *(byte_t *)&(hdr->saddr) == 0)
|
|
|| (hdr->daddr != 0 && *(byte_t *)&(hdr->daddr) == 0)
|
|
|| ((hdr->saddr == 0) != (hdr->daddr == 0)))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
// update packet to use proper addresses, recalc checksums
|
|
pkt.UpdateIPv4PacketOnDst(themIP, usIP);
|
|
return true;
|
|
});
|
|
}
|
|
|
|
huint32_t
|
|
TunEndpoint::GetIfAddr() const
|
|
{
|
|
return m_OurIP;
|
|
}
|
|
|
|
huint32_t
|
|
TunEndpoint::ObtainIPForAddr(const AlignedBuffer< 32 > &addr, bool snode)
|
|
{
|
|
llarp_time_t now = Now();
|
|
huint32_t nextIP = {0};
|
|
AlignedBuffer< 32 > ident(addr);
|
|
{
|
|
// previously allocated address
|
|
auto itr = m_AddrToIP.find(ident);
|
|
if(itr != m_AddrToIP.end())
|
|
{
|
|
// mark ip active
|
|
MarkIPActive(itr->second);
|
|
return itr->second;
|
|
}
|
|
}
|
|
// allocate new address
|
|
if(m_NextIP < m_MaxIP)
|
|
{
|
|
do
|
|
{
|
|
nextIP = ++m_NextIP;
|
|
} while(m_IPToAddr.find(nextIP) != m_IPToAddr.end()
|
|
&& m_NextIP < m_MaxIP);
|
|
if(nextIP < m_MaxIP)
|
|
{
|
|
m_AddrToIP[ident] = nextIP;
|
|
m_IPToAddr[nextIP] = ident;
|
|
m_SNodes[ident] = snode;
|
|
llarp::LogInfo(Name(), " mapped ", ident, " to ", nextIP);
|
|
MarkIPActive(nextIP);
|
|
return nextIP;
|
|
}
|
|
}
|
|
|
|
// we are full
|
|
// expire least active ip
|
|
// TODO: prevent DoS
|
|
std::pair< huint32_t, llarp_time_t > oldest = {huint32_t{0}, 0};
|
|
|
|
// find oldest entry
|
|
auto itr = m_IPActivity.begin();
|
|
while(itr != m_IPActivity.end())
|
|
{
|
|
if(itr->second <= now)
|
|
{
|
|
if((now - itr->second) > oldest.second)
|
|
{
|
|
oldest.first = itr->first;
|
|
oldest.second = itr->second;
|
|
}
|
|
}
|
|
++itr;
|
|
}
|
|
// remap address
|
|
m_IPToAddr[oldest.first] = ident;
|
|
m_AddrToIP[ident] = oldest.first;
|
|
m_SNodes[ident] = snode;
|
|
nextIP = oldest.first;
|
|
|
|
// mark ip active
|
|
m_IPActivity[nextIP] = std::max(m_IPActivity[nextIP], now);
|
|
|
|
return nextIP;
|
|
}
|
|
|
|
bool
|
|
TunEndpoint::HasRemoteForIP(huint32_t ip) const
|
|
{
|
|
return m_IPToAddr.find(ip) != m_IPToAddr.end();
|
|
}
|
|
|
|
void
|
|
TunEndpoint::MarkIPActive(huint32_t ip)
|
|
{
|
|
m_IPActivity[ip] = std::max(Now(), m_IPActivity[ip]);
|
|
}
|
|
|
|
void
|
|
TunEndpoint::MarkIPActiveForever(huint32_t ip)
|
|
{
|
|
m_IPActivity[ip] = std::numeric_limits< uint64_t >::max();
|
|
}
|
|
|
|
void
|
|
TunEndpoint::TickTun(__attribute__((unused)) llarp_time_t now)
|
|
{
|
|
// called in the isolated thread
|
|
}
|
|
|
|
void
|
|
TunEndpoint::tunifBeforeWrite(llarp_tun_io *tun)
|
|
{
|
|
// called in the isolated network thread
|
|
TunEndpoint *self = static_cast< TunEndpoint * >(tun->user);
|
|
// flush user to network
|
|
self->FlushSend();
|
|
// flush exit traffic queues if it's there
|
|
if(self->m_Exit)
|
|
self->m_Exit->Flush();
|
|
// flush snode traffic
|
|
self->FlushSNodeTraffic();
|
|
// flush network to user
|
|
self->m_NetworkToUserPktQueue.Process([tun](net::IPv4Packet &pkt) {
|
|
if(!llarp_ev_tun_async_write(tun, pkt.Buffer()))
|
|
llarp::LogWarn("packet dropped");
|
|
});
|
|
}
|
|
|
|
void
|
|
TunEndpoint::tunifRecvPkt(llarp_tun_io *tun, llarp_buffer_t buf)
|
|
{
|
|
// called for every packet read from user in isolated network thread
|
|
TunEndpoint *self = static_cast< TunEndpoint * >(tun->user);
|
|
if(!self->m_UserToNetworkPktQueue.EmplaceIf(
|
|
[buf](net::IPv4Packet &pkt) -> bool {
|
|
return pkt.Load(buf) && pkt.Header()->version == 4;
|
|
}))
|
|
{
|
|
llarp::LogInfo("invalid pkt");
|
|
llarp::DumpBuffer(buf);
|
|
}
|
|
}
|
|
|
|
TunEndpoint::~TunEndpoint()
|
|
{
|
|
}
|
|
|
|
} // namespace handlers
|
|
} // namespace llarp
|