static uint8_t incomingFromCryptoAuth(struct Message* message, struct Interface* iface) { struct Context* context = iface->receiverContext; int layer = context->layer; context->layer = INVALID_LAYER; if (layer == INNER_LAYER) { return incomingForMe(message, context); } else if (layer == OUTER_LAYER) { return incomingFromRouter(message, context); } assert(false); }
static uint8_t incomingFromCryptoAuth(struct Message* message, struct Interface* iface) { struct Ducttape* context = iface->receiverContext; int layer = context->layer; context->layer = INVALID_LAYER; if (layer == INNER_LAYER) { return incomingForMe(message, context, CryptoAuth_getHerPublicKey(context->session)); } else if (layer == OUTER_LAYER) { return incomingFromRouter(message, context); } Assert_true(false); return 0; }
static inline int incomingFromRouter(struct Message* message, struct Ducttape_MessageHeader* dtHeader, struct SessionManager_Session* session, struct Ducttape_pvt* context) { uint8_t* pubKey = CryptoAuth_getHerPublicKey(&session->iface); if (!validEncryptedIP6(message)) { // Not valid cjdns IPv6, we'll try it as an IPv4 or ICANN-IPv6 packet // and check if we have an agreement with the node who sent it. Message_shift(message, IpTunnel_PacketInfoHeader_SIZE); struct IpTunnel_PacketInfoHeader* header = (struct IpTunnel_PacketInfoHeader*) message->bytes; uint8_t* addr = session->ip6; Bits_memcpyConst(header->nodeIp6Addr, addr, 16); Bits_memcpyConst(header->nodeKey, pubKey, 32); struct Interface* ipTun = &context->ipTunnel->nodeInterface; return ipTun->sendMessage(message, ipTun); } struct Address srcAddr = { .path = Endian_bigEndianToHost64(dtHeader->switchHeader->label_be) }; Bits_memcpyConst(srcAddr.key, pubKey, 32); //Log_debug(context->logger, "Got message from router.\n"); int ret = core(message, dtHeader, session, context); struct Node* n = RouterModule_getNode(srcAddr.path, context->routerModule); if (!n) { Address_getPrefix(&srcAddr); RouterModule_addNode(context->routerModule, &srcAddr, session->version); } else { n->reach += 1; RouterModule_updateReach(n, context->routerModule); } return ret; } static uint8_t incomingFromCryptoAuth(struct Message* message, struct Interface* iface) { struct Ducttape_pvt* context = Identity_cast((struct Ducttape_pvt*) iface->receiverContext); struct Ducttape_MessageHeader* dtHeader = getDtHeader(message, false); enum Ducttape_SessionLayer layer = dtHeader->layer; dtHeader->layer = Ducttape_SessionLayer_INVALID; struct SessionManager_Session* session = SessionManager_sessionForHandle(dtHeader->receiveHandle, context->sm); if (!session) { // This should never happen but there's no strong preventitive. Log_info(context->logger, "SESSION DISAPPEARED!"); return 0; } // If the packet came from a new session, put the send handle in the session. if (CryptoAuth_getState(iface) < CryptoAuth_ESTABLISHED) { // If this is true then the incoming message is definitely a handshake. if (message->length < 4) { debugHandles0(context->logger, session, "runt"); return Error_INVALID; } if (layer == Ducttape_SessionLayer_OUTER) { #ifdef Version_2_COMPAT if (dtHeader->currentSessionVersion >= 3) { session->version = dtHeader->currentSessionVersion; #endif Message_pop(message, &session->sendHandle_be, 4); #ifdef Version_2_COMPAT } else { session->sendHandle_be = dtHeader->currentSessionSendHandle_be; } #endif } else { // inner layer, always grab the handle Message_pop(message, &session->sendHandle_be, 4); debugHandles0(context->logger, session, "New session, incoming layer3"); } } switch (layer) { case Ducttape_SessionLayer_OUTER: return incomingFromRouter(message, dtHeader, session, context); case Ducttape_SessionLayer_INNER: return incomingForMe(message, dtHeader, session, context, CryptoAuth_getHerPublicKey(iface)); default: Assert_always(false); } // never reached. return 0; } static uint8_t outgoingFromCryptoAuth(struct Message* message, struct Interface* iface) { struct Ducttape_pvt* context = Identity_cast((struct Ducttape_pvt*) iface->senderContext); struct Ducttape_MessageHeader* dtHeader = getDtHeader(message, false); struct SessionManager_Session* session = SessionManager_sessionForHandle(dtHeader->receiveHandle, context->sm); enum Ducttape_SessionLayer layer = dtHeader->layer; dtHeader->layer = Ducttape_SessionLayer_INVALID; if (!session) { // This should never happen but there's no strong preventitive. Log_info(context->logger, "SESSION DISAPPEARED!"); return 0; } if (layer == Ducttape_SessionLayer_OUTER) { return sendToSwitch(message, dtHeader, session, context); } else if (layer == Ducttape_SessionLayer_INNER) { Log_debug(context->logger, "Sending layer3 message"); return outgoingFromMe(message, dtHeader, session, context); } else { Assert_true(0); } } /** * Handle an incoming control message from a switch. * * @param context the ducttape context. * @param message the control message, this should be alligned on the beginning of the content, * that is to say, after the end of the switch header. * @param switchHeader the header. * @param switchIf the interface which leads to the switch. */ static uint8_t handleControlMessage(struct Ducttape_pvt* context, struct Message* message, struct Headers_SwitchHeader* switchHeader, struct Interface* switchIf) { uint8_t labelStr[20]; uint64_t label = Endian_bigEndianToHost64(switchHeader->label_be); AddrTools_printPath(labelStr, label); if (message->length < Control_HEADER_SIZE) { Log_info(context->logger, "dropped runt ctrl packet from [%s]", labelStr); return Error_NONE; } struct Control* ctrl = (struct Control*) message->bytes; if (Checksum_engine(message->bytes, message->length)) { Log_info(context->logger, "ctrl packet from [%s] with invalid checksum.", labelStr); return Error_NONE; } bool pong = false; if (ctrl->type_be == Control_ERROR_be) { if (message->length < Control_Error_MIN_SIZE) { Log_info(context->logger, "dropped runt error packet from [%s]", labelStr); return Error_NONE; } uint64_t path = Endian_bigEndianToHost64(switchHeader->label_be); RouterModule_brokenPath(path, context->routerModule); uint8_t causeType = Headers_getMessageType(&ctrl->content.error.cause); if (causeType == Headers_SwitchHeader_TYPE_CONTROL) { if (message->length < Control_Error_MIN_SIZE + Control_HEADER_SIZE) { Log_info(context->logger, "error packet from [%s] containing runt cause packet", labelStr); return Error_NONE; } struct Control* causeCtrl = (struct Control*) &(&ctrl->content.error.cause)[1]; if (causeCtrl->type_be != Control_PING_be) { Log_info(context->logger, "error packet from [%s] caused by [%s] packet ([%u])", labelStr, Control_typeString(causeCtrl->type_be), Endian_bigEndianToHost16(causeCtrl->type_be)); } else { if (LabelSplicer_isOneHop(label) && ctrl->content.error.errorType_be == Endian_hostToBigEndian32(Error_UNDELIVERABLE)) { // this is our own InterfaceController complaining // because the node isn't responding to pings. return Error_NONE; } Log_debug(context->logger, "error packet from [%s] in response to ping, err [%u], length: [%u].", labelStr, Endian_bigEndianToHost32(ctrl->content.error.errorType_be), message->length); // errors resulting from pings are forwarded back to the pinger. pong = true; } } else if (causeType != Headers_SwitchHeader_TYPE_DATA) { Log_info(context->logger, "error packet from [%s] containing cause of unknown type [%u]", labelStr, causeType); } else { Log_info(context->logger, "error packet from [%s], error type [%u]", labelStr, Endian_bigEndianToHost32(ctrl->content.error.errorType_be)); } } else if (ctrl->type_be == Control_PONG_be) { pong = true; } else if (ctrl->type_be == Control_PING_be) { Message_shift(message, -Control_HEADER_SIZE); if (message->length < Control_Ping_MIN_SIZE) { Log_info(context->logger, "dropped runt ping"); return Error_INVALID; } struct Control_Ping* ping = (struct Control_Ping*) message->bytes; ping->magic = Control_Pong_MAGIC; ping->version_be = Endian_hostToBigEndian32(Version_CURRENT_PROTOCOL); Message_shift(message, Control_HEADER_SIZE); ctrl->type_be = Control_PONG_be; ctrl->checksum_be = 0; ctrl->checksum_be = Checksum_engine(message->bytes, message->length); Message_shift(message, Headers_SwitchHeader_SIZE); Log_info(context->logger, "got switch ping from [%s]", labelStr); switchIf->receiveMessage(message, switchIf); } else { Log_info(context->logger, "control packet of unknown type from [%s], type [%d]", labelStr, Endian_bigEndianToHost16(ctrl->type_be)); } if (pong && context->pub.switchPingerIf.receiveMessage) { // Shift back over the header Message_shift(message, Headers_SwitchHeader_SIZE); context->pub.switchPingerIf.receiveMessage( message, &context->pub.switchPingerIf); } return Error_NONE; }