#include #include #include std::string const default_chars = "abcdefghijklmnaoqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"; #include std::string random_string(size_t len = 15, std::string const &allowed_chars = default_chars) { std::mt19937_64 gen{std::random_device()()}; std::uniform_int_distribution< size_t > dist{0, allowed_chars.length() - 1}; std::string ret; std::generate_n(std::back_inserter(ret), len, [&] { return allowed_chars[dist(gen)]; }); return ret; } struct check_query_simple_request { const struct sockaddr *from; // source dnsd_question_request *request; }; std::unordered_map< std::string, struct dnsd_query_hook_response * > loki_tld_lookup_cache; void llarp_dotlokilookup_checkQuery(void *u, __attribute__((unused)) uint64_t orig, uint64_t left) { if(left) return; // struct check_query_request *request = static_cast< struct // check_query_request * >(u); struct check_query_simple_request *qr = static_cast< struct check_query_simple_request * >(u); dotLokiLookup *dll = (dotLokiLookup *)qr->request->context->user; if(!dll) { llarp::LogError("DNSd dotLokiLookup is not configured"); write404_dnss_response(qr->from, qr->request); delete qr; return; } // we do have result // if so send that // else // if we have a free private ip, send that llarp::service::Address addr; if(!addr.FromString(qr->request->question.name)) { llarp::LogWarn("Could not base32 decode address: ", qr->request->question.name); write404_dnss_response(qr->from, qr->request); delete qr; return; } /* // cache hit auto itr = loki_tld_lookup_cache.find(addr.ToString()); if(itr != loki_tld_lookup_cache.end()) { llarp::LogDebug("Found in .loki lookup cache"); writesend_dnss_response(itr->second->returnThis, qr->from, qr->request); delete qr; return; } struct dns_pointer *free_private = dns_iptracker_get_free(dll->ip_tracker); if(free_private) { */ // in_addr ip_address = ((sockaddr_in *)free_private->hostResult)->sin_addr; llarp::service::Context *routerHiddenServiceContext = (llarp::service::Context *)dll->user; if(!routerHiddenServiceContext) { llarp::LogWarn("dotLokiLookup user isnt a service::Context: ", dll->user); write404_dnss_response(qr->from, qr->request); delete qr; return; } llarp::huint32_t *tunIp = new llarp::huint32_t(routerHiddenServiceContext->GetIpForAddr(addr)); if(!tunIp->h) { llarp::LogWarn("dotLokiLookup failed to map address"); write404_dnss_response(qr->from, qr->request); delete qr; return; } /* bool mapResult = routerHiddenServiceContext->MapAddressAll( addr, free_private->hostResult); if(!mapResult) { llarp::LogWarn("dotLokiLookup failed to map address"); write404_dnss_response(qr->from, qr->request); delete qr; return; } */ // make a dnsd_query_hook_response for the cache dnsd_query_hook_response *response = new dnsd_query_hook_response; response->dontLookUp = true; response->dontSendResponse = false; // llarp::Addr test(*free_private->hostResult.getSockAddr()); // llarp::LogInfo("IP Test: ", test); // response->returnThis = &free_private->hostResult; response->returnThis = tunIp; llarp::LogInfo("Saving ", qr->request->question.name); loki_tld_lookup_cache[qr->request->question.name] = response; // we can't delete response now... /* llarp::handlers::TunEndpoint *tunEndpoint = (llarp::handlers::TunEndpoint *)dll->user; if (!tunEndpoint) { llarp::LogWarn("dotLokiLookup user isnt a tunEndpoint: ", dll->user); return; } bool mapResult = tunEndpoint->MapAddress(addr, free_private->hostResult.tohl()); if(!mapResult) { delete qr; return; } */ llarp::huint32_t foundAddr; if(!routerHiddenServiceContext->FindBestAddressFor(addr, foundAddr)) { write404_dnss_response(qr->from, qr->request); delete qr; return; } // make a dnsd_query_hook_response for the cache /* dnsd_query_hook_response *response = new dnsd_query_hook_response; response->dontLookUp = true; response->dontSendResponse = false; loki_tld_lookup_cache[addr.ToString()]=response; */ // we can't delete response now... // sockaddr_in saddr; // saddr.sin_family = AF_INET; // saddr.sin_addr.s_addr = llarp::xhtonl(foundAddr).n; // FIXME: flush cache to disk // on crash we'll need to bring up all the same IPs we assigned before... writesend_dnss_response(&foundAddr, qr->from, qr->request); delete qr; return; } std::vector< std::string > split(std::string str) { size_t pos = 0; std::string token; std::string s(str); std::vector< std::string > tokens; while((pos = s.find(".")) != std::string::npos) { token = s.substr(0, pos); // llarp::LogInfo("token [", token, "]"); tokens.push_back(token); s.erase(0, pos + 1); } token = s.substr(0, pos); tokens.push_back(token); // llarp::LogInfo("token [", token, "]"); return tokens; } struct reverse_handler_iter_context { std::string lName; const struct sockaddr *from; const struct dnsd_question_request *request; }; #if defined(ANDROID) || defined(RPI) static int stoi(const std::string &s) { return atoi(s.c_str()); } #endif bool ReverseHandlerIter(struct llarp::service::Context::endpoint_iter *endpointCfg) { reverse_handler_iter_context *context = (reverse_handler_iter_context *)endpointCfg->user; // llarp::LogInfo("context ", context->request->question.name); // llarp::LogInfo("Checking ", lName); llarp::handlers::TunEndpoint *tunEndpoint = (llarp::handlers::TunEndpoint *)endpointCfg->endpoint; if(!tunEndpoint) { llarp::LogError("No tunnel endpoint found"); return true; // still continue } // llarp::LogInfo("for ", tunEndpoint->tunif.ifaddr); std::string checkStr(tunEndpoint->tunif.ifaddr); std::vector< std::string > tokensSearch = split(context->lName); std::vector< std::string > tokensCheck = split(checkStr); // well the tunif is just one ip on a network range... // support "b._dns-sd._udp.0.0.200.10.in-addr.arpa" size_t searchTokens = tokensSearch.size(); std::string searchIp = tokensSearch[searchTokens - 3] + "." + tokensSearch[searchTokens - 4] + "." + tokensSearch[searchTokens - 5] + "." + tokensSearch[searchTokens - 6]; std::string checkIp = tokensCheck[0] + "." + tokensCheck[1] + "." + tokensCheck[2] + "." + tokensCheck[3]; llarp::LogDebug(searchIp, " vs ", checkIp); llarp::IPRange range = llarp::iprange_ipv4( stoi(tokensCheck[0]), stoi(tokensCheck[1]), stoi(tokensCheck[2]), stoi(tokensCheck[3]), tunEndpoint->tunif.netmask); // create range // hack atm to work around limitations in ipaddr_ipv4_bits and llarp::IPRange llarp::huint32_t searchIPv4_fixed = llarp::ipaddr_ipv4_bits( stoi(tokensSearch[searchTokens - 6]), stoi(tokensSearch[searchTokens - 5]), stoi(tokensSearch[searchTokens - 4]), stoi(tokensSearch[searchTokens - 3])); // create ip llarp::huint32_t searchIPv4_search = llarp::ipaddr_ipv4_bits( stoi(tokensSearch[searchTokens - 3]), stoi(tokensSearch[searchTokens - 4]), stoi(tokensSearch[searchTokens - 5]), stoi(tokensSearch[searchTokens - 6])); // create ip // bool inRange = range.Contains(searchAddr.xtohl()); bool inRange = range.Contains(searchIPv4_search); llarp::Addr searchAddr(searchIp); llarp::Addr checkAddr(checkIp); llarp::LogDebug(searchAddr, " vs ", range, " = ", inRange ? "inRange" : "not match"); if(inRange) { llarp::service::Address addr = tunEndpoint->ObtainAddrForIP< llarp::service::Address >( searchIPv4_fixed); if(addr.IsZero()) { write404_dnss_response(context->from, (dnsd_question_request *)context->request); } else { // llarp::LogInfo("Returning [", addr.ToString(), "]"); writesend_dnss_revresponse(addr.ToString(), context->from, (dnsd_question_request *)context->request); } return false; } return true; // we don't do anything with the result yet } dnsd_query_hook_response * llarp_dotlokilookup_handler(std::string name, const struct sockaddr *from, struct dnsd_question_request *const request) { dnsd_query_hook_response *response = new dnsd_query_hook_response; response->dontLookUp = false; response->dontSendResponse = false; response->returnThis = nullptr; llarp::LogDebug("Hooked ", name); std::string lName = name; std::transform(lName.begin(), lName.end(), lName.begin(), ::tolower); // llarp::LogDebug("Transformed ", lName); // 253.0.200.10.in-addr.arpa if(lName.find(".in-addr.arpa") != std::string::npos) { // llarp::LogDebug("Checking ", lName); dotLokiLookup *dll = (dotLokiLookup *)request->context->user; llarp::service::Context *routerHiddenServiceContext = (llarp::service::Context *)dll->user; if(!routerHiddenServiceContext) { llarp::LogWarn("dotLokiLookup user isnt a service::Context: ", dll->user); return response; } // llarp::LogDebug("Starting rev iter for ", lName); // which range? // for each tun interface struct reverse_handler_iter_context context; context.lName = lName; context.from = from; context.request = request; struct llarp::service::Context::endpoint_iter i; i.user = &context; i.index = 0; i.visit = &ReverseHandlerIter; bool res = routerHiddenServiceContext->iterate(i); if(!res) { llarp::LogDebug("Reverse is ours"); response->dontSendResponse = true; // should have already sent it } else { llarp::LogInfo("Reverse is not ours"); } } else if((lName.length() > 5 && lName.substr(lName.length() - 5, 5) == ".loki") || (lName.length() > 6 && lName.substr(lName.length() - 6, 6) == ".loki.")) { llarp::LogInfo("Detect Loki Lookup for ", lName); auto cache_check = loki_tld_lookup_cache.find(lName); if(cache_check != loki_tld_lookup_cache.end()) { // was in cache llarp::LogInfo("Reused address from LokiLookupCache"); // FIXME: avoid the response allocation if you could delete response; return cache_check->second; } // decode string into HS addr llarp::service::Address addr; if(!addr.FromString(lName)) { llarp::LogWarn("Could not base32 decode address"); response->dontLookUp = true; // will return nullptr which will give a 404 return response; } llarp::LogDebug("Base32 decoded address ", addr); dotLokiLookup *dll = (dotLokiLookup *)request->context->user; llarp::service::Context *routerHiddenServiceContext = (llarp::service::Context *)dll->user; if(!routerHiddenServiceContext) { llarp::LogWarn("dotLokiLookup user isnt a service::Context: ", dll->user); return response; } // start path build early (if you're looking it up, you're probably going to // use it) // main_router_prefetch(ctx, addr); // schedule future response check_query_simple_request *qr = new check_query_simple_request; qr->from = from; qr->request = request; auto tun = routerHiddenServiceContext->getFirstTun(); if(tun->HasPathToService(addr)) { llarp_dotlokilookup_checkQuery(qr, 0, 0); response->dontSendResponse = true; // will send it shortly return response; } // nslookup on osx is about 5 sec before a retry, 2s on linux llarp_logic_call_later(request->context->client.logic, {2000, qr, &llarp_dotlokilookup_checkQuery}); response->dontSendResponse = true; // will send it shortly } return response; }