//
// Peek at the header and derive our total message length
//
static size_t
_messageLengthFromHeader(AthenaTransportLink *athenaTransportLink, _UDPLinkData *linkData)
{
// Peek at our message header to determine the total length of buffer we need to allocate.
size_t fixedHeaderLength = ccnxCodecTlvPacket_MinimalHeaderLength();
PARCBuffer *wireFormatBuffer = parcBuffer_Allocate(fixedHeaderLength);
const uint8_t *peekBuffer = parcBuffer_Overlay(wireFormatBuffer, 0);
ssize_t readCount = recv(linkData->fd, (void *) peekBuffer, fixedHeaderLength, MSG_PEEK);
if (readCount == -1) {
parcBuffer_Release(&wireFormatBuffer);
if ((errno == EAGAIN) || (errno == EINTR)) {
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink), "recv retry (%s)", strerror(errno));
linkData->_stats.receive_ReadRetry++;
} else {
linkData->_stats.receive_ReadError++;
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink), "recv error (%s)", strerror(errno));
athenaTransportLink_SetEvent(athenaTransportLink, AthenaTransportLinkEvent_Error);
}
return -1;
}
// A zero read means no data
if (readCount == 0) {
parcBuffer_Release(&wireFormatBuffer);
return -1;
}
// Check for a short header read, since we're only peeking here we just return and retry later
if (readCount != fixedHeaderLength) {
linkData->_stats.receive_ReadHeaderFailure++;
parcBuffer_Release(&wireFormatBuffer);
return -1;
}
// Obtain the total size of the message from the header
size_t messageLength = ccnxCodecTlvPacket_GetPacketLength(wireFormatBuffer);
parcBuffer_Release(&wireFormatBuffer);
// Could do more to check the integrity of the message and framing.
// If length is greater than our MTU we will find out in the read.
if (messageLength < fixedHeaderLength) {
linkData->_stats.receive_BadMessageLength++;
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink), "Framing error, flushing link.");
char trash[MAXPATHLEN];
// Flush link to attempt to resync our framing
while (read(linkData->fd, trash, sizeof(trash)) == sizeof(trash)) {
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink), "... flushing link.");
}
return -1;
}
return messageLength;
}
AthenaTransportLink *
athenaTransportLinkModule_Open(AthenaTransportLinkModule *athenaTransportLinkModule, PARCURI *connectionURI)
{
AthenaTransportLink *athenaTransportLink = athenaTransportLinkModule->openMethod(athenaTransportLinkModule, connectionURI);
if (athenaTransportLink) {
athenaTransportLink_SetAddLinkCallback(athenaTransportLink,
(AthenaTransportLink_AddLinkCallback *) _athenaTransportLinkModule_AddLink,
athenaTransportLinkModule);
int result = _athenaTransportLinkModule_AddLink(athenaTransportLinkModule, athenaTransportLink);
if (result == -1) {
int addLinkError = errno;
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Adding link %s failed: %s", athenaTransportLink_GetName(athenaTransportLink), strerror(errno));
athenaTransportLink_Close(athenaTransportLink);
errno = addLinkError;
return NULL;
}
athenaTransportLink_SetRemoveLinkCallback(athenaTransportLink,
(AthenaTransportLink_RemoveLinkCallback *) _athenaTransportLinkModule_RemoveLink,
athenaTransportLinkModule);
}
return athenaTransportLink;
}
static CCNxMetaMessage *
_TemplateReceive(AthenaTransportLink *athenaTransportLink)
{
struct _TemplateLinkData *linkData = athenaTransportLink_GetPrivateData(athenaTransportLink);
CCNxMetaMessage *ccnxMetaMessage = NULL;
PARCBuffer *wireFormatBuffer = _internalRECEIVE(linkData);
// On error, just return and retry.
if (wireFormatBuffer == NULL) {
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink), "read error (%s)", strerror(errno));
return NULL;
}
// Construct, and return a ccnxMetaMessage from the wire format buffer.
ccnxMetaMessage = ccnxMetaMessage_CreateFromWireFormatBuffer(wireFormatBuffer);
if (ccnxMetaMessage == NULL) {
linkData->_stats.receive_DecodeFailed++;
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink), "Failed to decode message from received packet.");
}
parcBuffer_Release(&wireFormatBuffer);
if (parcDeque_Size(linkData->queue) > 0) { // if there's another message, mark an event.
athenaTransportLink_SetEvent(athenaTransportLink, AthenaTransportLinkEvent_Receive);
}
return ccnxMetaMessage;
}
LONGBOW_TEST_CASE(Global, parcLog_Error)
{
PARCLog *log = (PARCLog *) longBowTestCase_GetClipBoardData(testCase);
assertTrue(parcLog_Error(log, "This is a error message"),
"Expected message to be logged successfully");
}
LONGBOW_TEST_CASE(Global, parcLog_Error_WrongLevel)
{
PARCLog *log = (PARCLog *) longBowTestCase_GetClipBoardData(testCase);
parcLog_SetLevel(log, PARCLogLevel_Off);
assertFalse(parcLog_Error(log, "This is a debug message"),
"Expected message to not be logged");
}
static AthenaTransportLink *
_newLink(AthenaTransportLink *athenaTransportLink, _UDPLinkData *newLinkData)
{
// Accept a new tunnel connection.
// Clone a new link from the current listener.
const char *derivedLinkName = _createNameFromLinkData(&newLinkData->link);
AthenaTransportLink *newTransportLink = athenaTransportLink_Clone(athenaTransportLink,
derivedLinkName,
_UDPSend,
_UDPReceiveProxy,
_UDPClose);
if (newTransportLink == NULL) {
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink),
"athenaTransportLink_Clone failed");
parcMemory_Deallocate(&derivedLinkName);
_UDPLinkData_Destroy(&newLinkData);
return NULL;
}
_setConnectLinkState(newTransportLink, newLinkData);
// Send the new link up to be added.
int result = athenaTransportLink_AddLink(athenaTransportLink, newTransportLink);
if (result == -1) {
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink),
"athenaTransportLink_AddLink failed: %s", strerror(errno));
_UDPLinkData_Destroy(&newLinkData);
athenaTransportLink_Release(&newTransportLink);
} else {
parcLog_Info(athenaTransportLink_GetLogger(athenaTransportLink),
"new link accepted by %s: %s %s",
athenaTransportLink_GetName(athenaTransportLink), derivedLinkName,
athenaTransportLink_IsNotLocal(athenaTransportLink) ? "" : "(Local)");
}
parcMemory_Deallocate(&derivedLinkName);
// Could pass a message back here regarding the new link.
return newTransportLink;
}
AthenaEthernet *
athenaEthernet_Create(PARCLog *log, const char *interface, uint16_t etherType)
{
AthenaEthernet *athenaEthernet = parcObject_CreateAndClearInstance(AthenaEthernet);
athenaEthernet->log = parcLog_Acquire(log);
athenaEthernet->etherType = etherType;
athenaEthernet->fd = _open_socket(interface);
if (athenaEthernet->fd == -1) {
parcLog_Error(athenaEthernet->log, "socket: %s", strerror(errno));
athenaEthernet_Release(&athenaEthernet);
return NULL;
}
if (ioctl(athenaEthernet->fd, BIOCGBLEN, &(athenaEthernet->etherBufferLength))) {
perror("error getting buffer length");
return NULL;
}
// Populate the configured physical MAC and MTU by searching ifaddrs
struct ifaddrs *ifaddr;
int res = getifaddrs(&ifaddr);
if (res == -1) {
perror("getifaddrs");
return 0;
}
struct ifaddrs *next;
for (next = ifaddr; next != NULL; next = next->ifa_next) {
if (strcmp(next->ifa_name, interface) == 0) {
if (next->ifa_addr->sa_family == AF_LINK) {
struct sockaddr_dl *addr_dl = (struct sockaddr_dl *) next->ifa_addr;
// addr_dl->sdl_data[12] contains the interface name followed by the MAC address, so
// need to offset in to the array past the interface name.
memcpy(&(athenaEthernet->mac), &addr_dl->sdl_data[addr_dl->sdl_nlen], addr_dl->sdl_alen);
struct if_data *ifdata = (struct if_data *) next->ifa_data;
athenaEthernet->mtu = ifdata->ifi_mtu;
// break out of loop and freeifaddrs
break;
}
}
}
freeifaddrs(ifaddr);
return athenaEthernet;
}
static int
_setSocketOptions(AthenaTransportLinkModule *athenaTransportLinkModule, int fd)
{
int on = 1;
#ifdef BSD_IGNORESIGPIPE
int result = setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, (void *) &on, sizeof(on));
if (result) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"setsockopt failed to set SO_NOSIGPIPE (%s)", strerror(errno));
return -1;
}
#endif
return 0;
}
//
// Receive a message from the specified link.
//
static CCNxMetaMessage *
_ETHReceiveMessage(AthenaTransportLink *athenaTransportLink, struct ether_addr *peerAddress, socklen_t *peerAddressLength)
{
struct _ETHLinkData *linkData = athenaTransportLink_GetPrivateData(athenaTransportLink);
CCNxMetaMessage *ccnxMetaMessage = NULL;
AthenaTransportLinkEvent events = 0;
PARCBuffer *message = athenaEthernet_Receive(linkData->athenaEthernet, -1, &events);
if (message == NULL) {
return NULL;
}
// Mark any pending events
if (events) {
athenaTransportLink_SetEvent(athenaTransportLink, events);
}
// Map the header
struct ether_header *header = parcBuffer_Overlay(message, sizeof(struct ether_header));
// If the destination does not match my address, drop the message
if (memcmp(&linkData->link.myAddress, header->ether_dhost, ETHER_ADDR_LEN * sizeof(uint8_t)) != 0) {
linkData->_stats.receive_NoLinkDestination++;
parcBuffer_Release(&message);
return NULL;
}
assertTrue(header->ether_type == htons(CCNX_ETHERTYPE), "Unexpected ether type %x", header->ether_type);
// Set peerAddress from header source address
*peerAddressLength = ETHER_ADDR_LEN * sizeof(uint8_t);
memcpy(peerAddress, header->ether_shost, *peerAddressLength);
parcBuffer_SetPosition(message, sizeof(struct ether_header));
PARCBuffer *wireFormatBuffer = parcBuffer_Slice(message);
parcBuffer_Release(&message);
parcBuffer_SetPosition(wireFormatBuffer, 0);
// Construct, and return a ccnxMetaMessage from the wire format buffer.
ccnxMetaMessage = ccnxMetaMessage_CreateFromWireFormatBuffer(wireFormatBuffer);
if (ccnxMetaMessage == NULL) {
linkData->_stats.receive_DecodeFailed++;
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink), "Failed to decode message from received packet.");
} else if (ccnxTlvDictionary_GetSchemaVersion(ccnxMetaMessage) == CCNxTlvDictionary_SchemaVersion_V0) {
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink),
"received deprecated version %d message\n", ccnxTlvDictionary_GetSchemaVersion(ccnxMetaMessage));
}
parcBuffer_Release(&wireFormatBuffer);
return ccnxMetaMessage;
}
PARCBuffer *
athenaEthernet_Receive(AthenaEthernet *athenaEthernet, int timeout, AthenaTransportLinkEvent *events)
{
// Allocate, and read, a new BPF buffer if no packets are currently pending in an old one
if (athenaEthernet->bpfBuffer == NULL) {
athenaEthernet->bpfBuffer = parcBuffer_Allocate(athenaEthernet->etherBufferLength);
uint8_t *buffer = parcBuffer_Overlay(athenaEthernet->bpfBuffer, 0);
athenaEthernet->readCount = read(athenaEthernet->fd, buffer, athenaEthernet->etherBufferLength);
if (athenaEthernet->readCount == -1) {
if ((errno == EAGAIN) || (errno == EINTR)) {
parcLog_Info(athenaEthernet->log, "Ethernet read retry");
return NULL;
}
parcLog_Error(athenaEthernet->log, "recv: %s", strerror(errno));
*events = AthenaTransportLinkEvent_Error;
parcBuffer_Release(&athenaEthernet->bpfBuffer);
return NULL;
}
parcLog_Debug(athenaEthernet->log, "received bpf packet (size=%d)", athenaEthernet->readCount);
}
// Obtain the current position in the BPF buffer to return a message from
size_t position = parcBuffer_Position(athenaEthernet->bpfBuffer);
// Read the BPF header and seek past it
struct bpf_hdr *bpfhdr = parcBuffer_Overlay(athenaEthernet->bpfBuffer, sizeof(struct bpf_hdr));
parcBuffer_SetLimit(athenaEthernet->bpfBuffer, position + bpfhdr->bh_hdrlen + bpfhdr->bh_datalen);
parcBuffer_SetPosition(athenaEthernet->bpfBuffer, position + bpfhdr->bh_hdrlen);
parcLog_Debug(athenaEthernet->log, "received message (size=%d)", bpfhdr->bh_datalen);
// Slice a new PARCBuffer with the message to send up.
PARCBuffer *wireFormatBuffer = parcBuffer_Slice(athenaEthernet->bpfBuffer);
// If there's another packet in the buffer, position it and flag a receive event
if ((athenaEthernet->readCount - (position + bpfhdr->bh_hdrlen + bpfhdr->bh_datalen)) != 0) {
parcBuffer_SetLimit(athenaEthernet->bpfBuffer, athenaEthernet->readCount);
parcBuffer_SetPosition(athenaEthernet->bpfBuffer,
BPF_WORDALIGN(position + bpfhdr->bh_hdrlen + bpfhdr->bh_datalen));
// Mark a receive event for this packet
*events = AthenaTransportLinkEvent_Receive;
} else {
parcBuffer_Release(&athenaEthernet->bpfBuffer);
}
return wireFormatBuffer;
}
static bool
_linkIsEOF(AthenaTransportLink *athenaTransportLink)
{
struct _UDPLinkData *linkData = athenaTransportLink_GetPrivateData(athenaTransportLink);
// If poll indicates there's a read event and a subsequent read returns zero our peer has hungup.
struct pollfd pollfd = { .fd = linkData->fd, .events = POLLIN };
int events = poll(&pollfd, 1, 0);
if (events == -1) {
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink), "poll error (%s)", strerror(errno));
return true; // poll error, close the link
} else if (events == 0) {
// there are no pending events, was truly a zero read
return false;
}
if (pollfd.revents & POLLIN) {
char peekBuffer;
ssize_t readCount = recv(linkData->fd, (void *) &peekBuffer, 1, MSG_PEEK);
if (readCount == -1) {
if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) { // read blocked
linkData->_stats.receive_ReadWouldBlock++;
return false;
}
return true; // read error
}
if (readCount == 0) { // EOF
return true;
}
}
return false;
}
static void
_UDPClose(AthenaTransportLink *athenaTransportLink)
{
parcLog_Info(athenaTransportLink_GetLogger(athenaTransportLink),
"link %s closed", athenaTransportLink_GetName(athenaTransportLink));
_UDPLinkData *linkData = athenaTransportLink_GetPrivateData(athenaTransportLink);
close(linkData->fd);
_UDPLinkData_Destroy(&linkData);
}
static CCNxMetaMessage *
_Control_Command_Spawn(Athena *athena, CCNxName *ccnxName, const char *command, const char *connectionSpecification)
{
CCNxMetaMessage *responseMessage;
// Create a new athena instance
Athena *newAthena = athena_Create(AthenaDefaultContentStoreSize);
if (newAthena == NULL) {
responseMessage = _create_response(athena, ccnxName, "Could not create a new Athena instance");
return responseMessage;
}
// Add the specified link
PARCURI *connectionURI = parcURI_Parse(connectionSpecification);
if (athenaTransportLinkAdapter_Open(newAthena->athenaTransportLinkAdapter, connectionURI) == NULL) {
parcLog_Error(athena->log, "Unable to configure an interface. Exiting...");
responseMessage = _create_response(athena, ccnxName, "Unable to configure an Athena interface for thread");
parcURI_Release(&connectionURI);
athena_Release(&newAthena);
return responseMessage;
}
parcURI_Release(&connectionURI);
pthread_t thread;
// Passing in a reference that will be released by the new thread as the thread may not
// have time to acquire a reference itself before we release our reference.
if (pthread_create(&thread, NULL, _start_forwarder_instance, (void *) athena_Acquire(newAthena)) != 0) {
responseMessage = _create_response(athena, ccnxName, "Athena process thread creation failed");
return responseMessage;
}
athena_Release(&newAthena);
athenaInterestControl_LogConfigurationChange(athena, ccnxName, "%s", connectionSpecification);
responseMessage = _create_response(athena, ccnxName, "Athena process thread started on %s", connectionSpecification);
return responseMessage;
}
int
athenaTransportLinkAdapter_Poll(AthenaTransportLinkAdapter *athenaTransportLinkAdapter, int timeout)
{
struct pollfd *pollfdReceiveList = athenaTransportLinkAdapter->pollfdReceiveList;
struct pollfd *pollfdSendList = athenaTransportLinkAdapter->pollfdSendList;
int pollfdListSize = athenaTransportLinkAdapter->pollfdListSize;
AthenaTransportLinkModule *athenaTransportLinkModule;
int events = 0;
// Allow instances which have not registered an eventfd to mark their events
if (athenaTransportLinkAdapter->moduleList) {
for (int index = 0; index < parcArrayList_Size(athenaTransportLinkAdapter->moduleList); index++) {
athenaTransportLinkModule = parcArrayList_Get(athenaTransportLinkAdapter->moduleList, index);
events += athenaTransportLinkModule_Poll(athenaTransportLinkModule, timeout);
}
}
if (events) { // if we have existing events, poll doesn't need to block
timeout = 0;
}
int result = poll(pollfdReceiveList, pollfdListSize, timeout);
if (result < 0) {
parcLog_Error(athenaTransportLinkAdapter_GetLogger(athenaTransportLinkAdapter),
"Receive list poll error: (%d) %s", errno, strerror(errno));
} else {
for (int index = 0; index < pollfdListSize; index++) {
if (pollfdReceiveList[index].revents) {
AthenaTransportLink *athenaTransportLink = athenaTransportLinkAdapter->pollfdTransportLink[index];
if (athenaTransportLink) {
if (pollfdReceiveList[index].revents & (POLLERR | POLLHUP)) {
athenaTransportLink_SetEvent(athenaTransportLink, AthenaTransportLinkEvent_Error);
athenaTransportLink_Close(athenaTransportLink);
}
if (pollfdReceiveList[index].revents & POLLIN) {
athenaTransportLink_SetEvent(athenaTransportLink, AthenaTransportLinkEvent_Receive);
} else {
athenaTransportLink_ClearEvent(athenaTransportLink, AthenaTransportLinkEvent_Receive);
}
}
}
}
}
result = poll(pollfdSendList, pollfdListSize, 0);
if (result < 0) {
parcLog_Error(athenaTransportLinkAdapter_GetLogger(athenaTransportLinkAdapter),
"Send list poll error: (%d) %s", errno, strerror(errno));
} else {
for (int index = 0; index < pollfdListSize; index++) {
if (pollfdSendList[index].revents) {
AthenaTransportLink *athenaTransportLink = athenaTransportLinkAdapter->pollfdTransportLink[index];
if (athenaTransportLink) {
if (pollfdSendList[index].revents & (POLLNVAL | POLLHUP | POLLERR)) {
continue;
}
if (pollfdSendList[index].revents & (POLLERR | POLLHUP)) {
athenaTransportLink_SetEvent(athenaTransportLink, AthenaTransportLinkEvent_Error);
athenaTransportLink_Close(athenaTransportLink);
}
if (pollfdSendList[index].revents & POLLOUT) {
athenaTransportLink_SetEvent(athenaTransportLink, AthenaTransportLinkEvent_Send);
} else {
athenaTransportLink_ClearEvent(athenaTransportLink, AthenaTransportLinkEvent_Send);
}
}
}
}
//events += result; // don't register send events
}
return events;
}
static AthenaTransportLink *
_UDPOpen(AthenaTransportLinkModule *athenaTransportLinkModule, PARCURI *connectionURI)
{
AthenaTransportLink *result = 0;
const char *authorityString = parcURI_GetAuthority(connectionURI);
if (authorityString == NULL) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Unable to parse connection authority %s", authorityString);
errno = EINVAL;
return NULL;
}
PARCURIAuthority *authority = parcURIAuthority_Parse(authorityString);
const char *URIAddress = parcURIAuthority_GetHostName(authority);
in_port_t port = parcURIAuthority_GetPort(authority);
// Normalize the provided hostname
struct sockaddr_in *addr = (struct sockaddr_in *) parcNetwork_SockAddress(URIAddress, port);
char *address = inet_ntoa(addr->sin_addr);
parcMemory_Deallocate(&addr);
parcURIAuthority_Release(&authority);
if (address == NULL) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Unable to lookup hostname %s", address);
errno = EINVAL;
return NULL;
}
if (port == 0) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Invalid address specification, port == 0");
errno = EINVAL;
return NULL;
}
bool listener = false;
char name[MAXPATHLEN] = { 0 };
char srcAddress[NI_MAXHOST] = "0.0.0.0";
size_t mtu = 0;
uint16_t srcPort = 0;
char localFlag[MAXPATHLEN] = { 0 };
int forceLocal = 0;
char *linkName = NULL;
PARCURIPath *remainder = parcURI_GetPath(connectionURI);
size_t segments = parcURIPath_Count(remainder);
for (int i = 0; i < segments; i++) {
PARCURISegment *segment = parcURIPath_Get(remainder, i);
const char *token = parcURISegment_ToString(segment);
if (strcasecmp(token, UDP_LISTENER_FLAG) == 0) {
listener = true;
parcMemory_Deallocate(&token);
continue;
}
if (strncasecmp(token, SRC_LINK_SPECIFIER, strlen(SRC_LINK_SPECIFIER)) == 0) {
if (sscanf(token, "%*[^%%]%%3D%[^%%]%%3A%hd", srcAddress, &srcPort) != 2) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Improper connection source specification (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
// Normalize the provided hostname
struct sockaddr_in *addr = (struct sockaddr_in *) parcNetwork_SockAddress(srcAddress, srcPort);
char *hostname = inet_ntoa(addr->sin_addr);
parcMemory_Deallocate(&addr);
memcpy(srcAddress, hostname, strlen(hostname) + 1);
parcMemory_Deallocate(&token);
continue;
}
if (strncasecmp(token, LINK_MTU_SIZE, strlen(LINK_MTU_SIZE)) == 0) {
if (sscanf(token, "%*[^%%]%%3D%zd", &mtu) != 1) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Improper MTU specification (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
parcMemory_Deallocate(&token);
continue;
}
if (strncasecmp(token, LINK_NAME_SPECIFIER, strlen(LINK_NAME_SPECIFIER)) == 0) {
if (sscanf(token, "%*[^%%]%%3D%s", name) != 1) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Improper connection name specification (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
linkName = name;
parcMemory_Deallocate(&token);
continue;
}
if (strncasecmp(token, LOCAL_LINK_FLAG, strlen(LOCAL_LINK_FLAG)) == 0) {
if (sscanf(token, "%*[^%%]%%3D%s", localFlag) != 1) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Improper local specification (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
if (strncasecmp(localFlag, "false", strlen("false")) == 0) {
forceLocal = AthenaTransportLink_ForcedNonLocal;
} else if (strncasecmp(localFlag, "true", strlen("true")) == 0) {
forceLocal = AthenaTransportLink_ForcedLocal;
} else {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Improper local state specification (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
parcMemory_Deallocate(&token);
continue;
}
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Unknown connection parameter (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
struct sockaddr_in *destination = parcNetwork_SockInet4Address(address, port);
struct sockaddr_in *source = parcNetwork_SockInet4Address(srcAddress, srcPort);
if (listener) {
result = _UDPOpenListener(athenaTransportLinkModule, linkName, destination, mtu);
} else {
result = _UDPOpenConnection(athenaTransportLinkModule, linkName, source, destination, mtu);
}
parcMemory_Deallocate(&destination);
parcMemory_Deallocate(&source);
// forced IsLocal/IsNotLocal, mainly for testing
if (result && forceLocal) {
athenaTransportLink_ForceLocal(result, forceLocal);
}
return result;
}
//
// Open a listener which will create new links when messages arrive and queue them appropriately.
// Listeners are inherently insecure, as an adversary could easily create many connections that are never closed.
//
static AthenaTransportLink *
_UDPOpenListener(AthenaTransportLinkModule *athenaTransportLinkModule, const char *linkName, struct sockaddr_in *destination, size_t mtu)
{
const char *derivedLinkName;
_UDPLinkData *linkData = _UDPLinkData_Create();
linkData->multiplexTable = parcHashCodeTable_Create(_connectionEquals, _connectionHashCode, NULL, _closeConnection);
assertNotNull(linkData->multiplexTable, "Could not create multiplex table for new listener");
linkData->link.myAddress = *destination;
linkData->link.myAddressLength = sizeof(struct sockaddr_in);
linkData->link.mtu = mtu;
linkData->fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (linkData->fd < 0) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"socket error (%s)", strerror(errno));
_UDPLinkData_Destroy(&linkData);
return NULL;
}
int result = _setSocketOptions(athenaTransportLinkModule, linkData->fd);
if (result) {
close(linkData->fd);
_UDPLinkData_Destroy(&linkData);
return NULL;
}
// Set non-blocking flag
int flags = fcntl(linkData->fd, F_GETFL, NULL);
if (flags < 0) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"fcntl failed to get non-blocking flag (%s)", strerror(errno));
close(linkData->fd);
_UDPLinkData_Destroy(&linkData);
return NULL;
}
result = fcntl(linkData->fd, F_SETFL, flags | O_NONBLOCK);
if (result) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"fcntl failed to set non-blocking flag (%s)", strerror(errno));
close(linkData->fd);
_UDPLinkData_Destroy(&linkData);
return NULL;
}
// bind to listen on requested address
result = bind(linkData->fd, (struct sockaddr *) &linkData->link.myAddress, linkData->link.myAddressLength);
if (result) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"bind error (%s)", strerror(errno));
close(linkData->fd);
_UDPLinkData_Destroy(&linkData);
return NULL;
}
derivedLinkName = _createNameFromLinkData(&linkData->link);
if (linkName == NULL) {
linkName = derivedLinkName;
}
// Listener doesn't require a send method. The receive method is used to establish new connections.
AthenaTransportLink *athenaTransportLink = athenaTransportLink_Create(linkName,
NULL,
_UDPReceiveListener,
_UDPClose);
if (athenaTransportLink == NULL) {
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink),
"athenaTransportLink_Create failed");
parcMemory_Deallocate(&derivedLinkName);
close(linkData->fd);
_UDPLinkData_Destroy(&linkData);
return athenaTransportLink;
}
athenaTransportLink_SetPrivateData(athenaTransportLink, linkData);
athenaTransportLink_SetEventFd(athenaTransportLink, linkData->fd);
// Links established for listening are not used to route messages.
// They can be kept in a listener list that doesn't consume a linkId.
athenaTransportLink_SetRoutable(athenaTransportLink, false);
parcLog_Info(athenaTransportLink_GetLogger(athenaTransportLink),
"new listener established: Name=\"%s\" (%s)", linkName, derivedLinkName);
parcMemory_Deallocate(&derivedLinkName);
return athenaTransportLink;
}
//
// Open a UDP point to point connection.
//
static AthenaTransportLink *
_UDPOpenConnection(AthenaTransportLinkModule *athenaTransportLinkModule, const char *linkName, struct sockaddr_in *source, struct sockaddr_in *destination, size_t mtu)
{
const char *derivedLinkName;
_UDPLinkData *linkData = _UDPLinkData_Create();
linkData->link.peerAddress = *((struct sockaddr_in *) destination);
linkData->link.peerAddressLength = sizeof(struct sockaddr_in);
linkData->link.mtu = mtu;
linkData->fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (linkData->fd < 0) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule), "socket error (%s)", strerror(errno));
_UDPLinkData_Destroy(&linkData);
return NULL;
}
int result = _setSocketOptions(athenaTransportLinkModule, linkData->fd);
if (result) {
close(linkData->fd);
_UDPLinkData_Destroy(&linkData);
return NULL;
}
// bind the local endpoint so we can know our allocated port if it was wildcarded
result = bind(linkData->fd, (struct sockaddr *) source, sizeof(struct sockaddr_in));
if (result) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"bind error (%s)", strerror(errno));
close(linkData->fd);
_UDPLinkData_Destroy(&linkData);
return NULL;
}
// Retrieve the local endpoint data, used to create the derived name.
linkData->link.myAddressLength = sizeof(struct sockaddr_in);
result = getsockname(linkData->fd, (struct sockaddr *) &linkData->link.myAddress, &linkData->link.myAddressLength);
if (result != 0) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Failed to obtain endpoint information from getsockname.");
_UDPLinkData_Destroy(&linkData);
return NULL;
}
derivedLinkName = _createNameFromLinkData(&linkData->link);
if (linkName == NULL) {
linkName = derivedLinkName;
}
AthenaTransportLink *athenaTransportLink = athenaTransportLink_Create(linkName,
_UDPSend,
_UDPReceive,
_UDPClose);
if (athenaTransportLink == NULL) {
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink),
"athenaTransportLink_Create failed");
parcMemory_Deallocate(&derivedLinkName);
_UDPLinkData_Destroy(&linkData);
return NULL;
}
_setConnectLinkState(athenaTransportLink, linkData);
// Enable Send? XXX
athenaTransportLink_SetEvent(athenaTransportLink, AthenaTransportLinkEvent_Send);
parcLog_Info(athenaTransportLink_GetLogger(athenaTransportLink),
"new link established: Name=\"%s\" (%s)", linkName, derivedLinkName);
parcMemory_Deallocate(&derivedLinkName);
return athenaTransportLink;
return NULL;
}
//
// Receive a message from the specified link.
//
static CCNxMetaMessage *
_UDPReceiveMessage(AthenaTransportLink *athenaTransportLink, struct sockaddr_in *peerAddress, socklen_t *peerAddressLength)
{
struct _UDPLinkData *linkData = athenaTransportLink_GetPrivateData(athenaTransportLink);
CCNxMetaMessage *ccnxMetaMessage = NULL;
size_t messageLength;
// If an MTU has been set, allocate a buffer of that size to avoid having to peek at the message,
// othersize derive the link from the header and allocate a buffer based on the message size.
if ((messageLength = linkData->link.mtu) == 0) {
messageLength = _messageLengthFromHeader(athenaTransportLink, linkData);
if (messageLength <= 0) {
return NULL;
}
}
PARCBuffer *wireFormatBuffer = parcBuffer_Allocate(messageLength);
char *buffer = parcBuffer_Overlay(wireFormatBuffer, 0);
*peerAddressLength = (socklen_t) sizeof(struct sockaddr_in);
ssize_t readCount = recvfrom(linkData->fd, buffer, messageLength, 0, (struct sockaddr *) peerAddress, peerAddressLength);
// On error, just return and retry.
if (readCount == -1) {
linkData->_stats.receive_ReadError++;
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink), "read error (%s)", strerror(errno));
parcBuffer_Release(&wireFormatBuffer);
return NULL;
}
// A zero read means either no more data is currently available or our peer hungup.
// Just return to retry as we'll detect EOF when we come back at the top of UDPReceive
if (readCount == 0) {
parcBuffer_Release(&wireFormatBuffer);
return NULL;
}
// If it was it a short read just return to retry later.
while (readCount < messageLength) {
linkData->_stats.receive_ShortRead++;
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink), "short read error (%s)", strerror(errno));
parcBuffer_Release(&wireFormatBuffer);
return NULL;
}
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink), "received message (size=%d)", readCount);
parcBuffer_SetPosition(wireFormatBuffer, parcBuffer_Position(wireFormatBuffer) + readCount);
parcBuffer_Flip(wireFormatBuffer);
// Construct, and return a ccnxMetaMessage from the wire format buffer.
ccnxMetaMessage = ccnxMetaMessage_CreateFromWireFormatBuffer(wireFormatBuffer);
if (ccnxTlvDictionary_GetSchemaVersion(ccnxMetaMessage) == CCNxTlvDictionary_SchemaVersion_V0) {
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink),
"received deprecated version %d message\n", ccnxTlvDictionary_GetSchemaVersion(ccnxMetaMessage));
}
if (ccnxMetaMessage == NULL) {
linkData->_stats.receive_DecodeFailed++;
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink), "Failed to decode message from received packet.");
}
parcBuffer_Release(&wireFormatBuffer);
return ccnxMetaMessage;
}
//
// Open a point to point connection.
//
static AthenaTransportLink *
_ETHOpenConnection(AthenaTransportLinkModule *athenaTransportLinkModule, const char *linkName, const char *device, struct ether_addr *source, struct ether_addr *destination, size_t mtu)
{
const char *derivedLinkName;
_ETHLinkData *linkData = _ETHLinkData_Create();
linkData->athenaEthernet = athenaEthernet_Create(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
device, CCNX_ETHERTYPE);
if (linkData->athenaEthernet == NULL) {
_ETHLinkData_Destroy(&linkData);
return NULL;
}
// Use our default MAC address if none specified.
if (source == NULL) {
athenaEthernet_GetMAC(linkData->athenaEthernet, &(linkData->link.myAddress));
linkData->link.myAddressLength = ETHER_ADDR_LEN;
} else {
memcpy(&(linkData->link.myAddress), source, sizeof(struct ether_addr));
}
// If there's no destination specified, drop the request.
if (destination == NULL) {
_ETHLinkData_Destroy(&linkData);
return NULL;
}
// Copy the peer destination address into our link data
memcpy(&(linkData->link.peerAddress), destination, sizeof(struct ether_addr));
derivedLinkName = _createNameFromLinkData(&linkData->link, false);
if (linkName == NULL) {
linkName = derivedLinkName;
}
AthenaTransportLink *athenaTransportLink = athenaTransportLink_Create(linkName,
_ETHSend,
_ETHReceive,
_ETHClose);
if (athenaTransportLink == NULL) {
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink),
"athenaTransportLink_Create failed");
parcMemory_Deallocate(&derivedLinkName);
_ETHLinkData_Destroy(&linkData);
return NULL;
}
_setConnectLinkState(athenaTransportLink, linkData);
// Enable Sends
athenaTransportLink_SetEvent(athenaTransportLink, AthenaTransportLinkEvent_Send);
parcLog_Info(athenaTransportLink_GetLogger(athenaTransportLink),
"new link established: Name=\"%s\" (%s)", linkName, derivedLinkName);
parcMemory_Deallocate(&derivedLinkName);
return athenaTransportLink;
return NULL;
}
static int
_UDPSend(AthenaTransportLink *athenaTransportLink, CCNxMetaMessage *ccnxMetaMessage)
{
struct _UDPLinkData *linkData = athenaTransportLink_GetPrivateData(athenaTransportLink);
if (ccnxTlvDictionary_GetSchemaVersion(ccnxMetaMessage) == CCNxTlvDictionary_SchemaVersion_V0) {
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink),
"sending deprecated version %d message\n", ccnxTlvDictionary_GetSchemaVersion(ccnxMetaMessage));
}
// Get a wire format buffer and write it out.
PARCBuffer *wireFormatBuffer = ccnxWireFormatMessage_GetWireFormatBuffer(ccnxMetaMessage);
if (wireFormatBuffer == NULL) {
CCNxCodecNetworkBufferIoVec *iovec = ccnxWireFormatMessage_GetIoVec(ccnxMetaMessage);
assertNotNull(iovec, "Null io vector");
size_t iovcnt = ccnxCodecNetworkBufferIoVec_GetCount((CCNxCodecNetworkBufferIoVec *) iovec);
const struct iovec *array = ccnxCodecNetworkBufferIoVec_GetArray((CCNxCodecNetworkBufferIoVec *) iovec);
// If it's a single vector wrap it in a buffer to avoid a copy
if (iovcnt == 1) {
wireFormatBuffer = parcBuffer_Wrap(array[0].iov_base, array[0].iov_len, 0, array[0].iov_len);
} else {
size_t totalbytes = 0;
for (int i = 0; i < iovcnt; i++) {
totalbytes += array[i].iov_len;
}
wireFormatBuffer = parcBuffer_Allocate(totalbytes);
for (int i = 0; i < iovcnt; i++) {
parcBuffer_PutArray(wireFormatBuffer, array[i].iov_len, array[i].iov_base);
}
parcBuffer_Flip(wireFormatBuffer);
}
} else {
wireFormatBuffer = parcBuffer_Acquire(wireFormatBuffer);
}
size_t length = parcBuffer_Limit(wireFormatBuffer);
char *buffer = parcBuffer_Overlay(wireFormatBuffer, length);
if (linkData->link.mtu) {
if (length > linkData->link.mtu) {
errno = EMSGSIZE;
parcBuffer_Release(&wireFormatBuffer);
return -1;
}
}
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink),
"sending message (size=%d)", length);
ssize_t writeCount = 0;
#ifdef LINUX_IGNORESIGPIPE
writeCount = sendto(linkData->fd, buffer, length, MSG_NOSIGNAL,
(struct sockaddr *) &linkData->link.peerAddress, linkData->link.peerAddressLength);
#else
writeCount = sendto(linkData->fd, buffer, length, 0,
(struct sockaddr *) &linkData->link.peerAddress, linkData->link.peerAddressLength);
#endif
// on error close the link, else return to retry a zero write
if (writeCount == -1) {
if (errno == EPIPE) {
athenaTransportLink_SetEvent(athenaTransportLink, AthenaTransportLinkEvent_Error);
}
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink),
"send error (%s)", strerror(errno));
parcBuffer_Release(&wireFormatBuffer);
return -1;
}
// Short write
if (writeCount != length) {
linkData->_stats.receive_ShortWrite++;
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink), "short write");
parcBuffer_Release(&wireFormatBuffer);
return -1;
}
parcBuffer_Release(&wireFormatBuffer);
return 0;
}
static int
_UDPSend(AthenaTransportLink *athenaTransportLink, CCNxMetaMessage *ccnxMetaMessage)
{
struct _UDPLinkData *linkData = athenaTransportLink_GetPrivateData(athenaTransportLink);
if (ccnxTlvDictionary_GetSchemaVersion(ccnxMetaMessage) == CCNxTlvDictionary_SchemaVersion_V0) {
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink),
"sending deprecated version %d message\n", ccnxTlvDictionary_GetSchemaVersion(ccnxMetaMessage));
}
// Get a wire format buffer and write it out.
PARCBuffer *wireFormatBuffer = athenaTransportLinkModule_GetMessageBuffer(ccnxMetaMessage);
parcBuffer_SetPosition(wireFormatBuffer, 0);
size_t length = parcBuffer_Limit(wireFormatBuffer);
char *buffer = parcBuffer_Overlay(wireFormatBuffer, length);
if (linkData->link.mtu) {
if (length > linkData->link.mtu) {
errno = EMSGSIZE;
parcBuffer_Release(&wireFormatBuffer);
return -1;
}
}
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink),
"sending message (size=%d)", length);
ssize_t writeCount = 0;
#ifdef LINUX_IGNORESIGPIPE
writeCount = sendto(linkData->fd, buffer, length, MSG_NOSIGNAL,
(struct sockaddr *) &linkData->link.peerAddress, linkData->link.peerAddressLength);
#else
writeCount = sendto(linkData->fd, buffer, length, 0,
(struct sockaddr *) &linkData->link.peerAddress, linkData->link.peerAddressLength);
#endif
// on error close the link, else return to retry a zero write
if (writeCount == -1) {
if ((errno == EAGAIN) || (errno == EINTR)) {
linkData->_stats.send_SendRetry++;
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink), "send retry (%s)", strerror(errno));
} else {
athenaTransportLink_SetEvent(athenaTransportLink, AthenaTransportLinkEvent_Error);
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink),
"send error (%s)", strerror(errno));
}
parcBuffer_Release(&wireFormatBuffer);
return -1;
}
// Short write
if (writeCount != length) {
linkData->_stats.send_ShortWrite++;
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink), "short write");
parcBuffer_Release(&wireFormatBuffer);
return -1;
}
parcBuffer_Release(&wireFormatBuffer);
return 0;
}
static AthenaTransportLink *
_TemplateOpen(AthenaTransportLinkModule *athenaTransportLinkModule, PARCURI *connectionURI)
{
// Parse the URI contents to determine the link specific parameters
const char *authorityString = parcURI_GetAuthority(connectionURI);
if (authorityString == NULL) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Unable to parse connection authority %s", authorityString);
errno = EINVAL;
return NULL;
}
//
// This template link module doesn't use the authority fields.
// The access methods are here for use by derived link modules, if needed.
//
PARCURIAuthority *authority = parcURIAuthority_Parse(authorityString);
//const char *URIAddress = parcURIAuthority_GetHostName(authority);
//in_port_t port = parcURIAuthority_GetPort(authority);
parcURIAuthority_Release(&authority);
int forceLocal = 0;
char specifiedLinkName[MAXPATHLEN] = { 0 };
const char *linkName = NULL;
// Parse connection segment parameters, Name and Local
PARCURIPath *remainder = parcURI_GetPath(connectionURI);
size_t segments = parcURIPath_Count(remainder);
for (int i = 0; i < segments; i++) {
PARCURISegment *segment = parcURIPath_Get(remainder, i);
const char *token = parcURISegment_ToString(segment);
if (strncasecmp(token, LINK_NAME_SPECIFIER, strlen(LINK_NAME_SPECIFIER)) == 0) {
if (_parseLinkName(token, specifiedLinkName) != 0) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Improper connection name specification (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
linkName = specifiedLinkName;
parcMemory_Deallocate(&token);
continue;
}
if (strncasecmp(token, LOCAL_LINK_FLAG, strlen(LOCAL_LINK_FLAG)) == 0) {
forceLocal = _parseLocalFlag(token);
if (forceLocal == 0) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Improper local specification (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
parcMemory_Deallocate(&token);
continue;
}
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Unknown connection parameter (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
_TemplateLinkData *linkData = _TemplateLinkData_Create();
const char *derivedLinkName = _createNameFromLinkData(linkData);
if (linkName == NULL) {
linkName = derivedLinkName;
}
AthenaTransportLink *athenaTransportLink = athenaTransportLink_Create(linkName,
_TemplateSend,
_TemplateReceive,
_TemplateClose);
if (athenaTransportLink == NULL) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"athenaTransportLink_Create failed");
parcMemory_Deallocate(&derivedLinkName);
_TemplateLinkData_Destroy(&linkData);
return athenaTransportLink;
}
athenaTransportLink_SetPrivateData(athenaTransportLink, linkData);
athenaTransportLink_SetEvent(athenaTransportLink, AthenaTransportLinkEvent_Send);
parcLog_Info(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"new link established: Name=\"%s\" (%s)", linkName, derivedLinkName);
parcMemory_Deallocate(&derivedLinkName);
// forced IsLocal/IsNotLocal, mainly for testing
if (athenaTransportLink && forceLocal) {
athenaTransportLink_ForceLocal(athenaTransportLink, forceLocal);
}
return athenaTransportLink;
}
//
// Open a listener which will create new links when messages arrive and queue them appropriately.
// Listeners are inherently insecure, as an adversary could easily create many connections that are never closed.
//
static AthenaTransportLink *
_ETHOpenListener(AthenaTransportLinkModule *athenaTransportLinkModule, const char *linkName, const char *device, struct ether_addr *source, size_t mtu)
{
const char *derivedLinkName;
_ETHLinkData *linkData = _ETHLinkData_Create();
linkData->multiplexTable = parcHashCodeTable_Create(_connectionEquals, _connectionHashCode, NULL, _closeConnection);
assertNotNull(linkData->multiplexTable, "Could not create multiplex table for new listener");
linkData->athenaEthernet = athenaEthernet_Create(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
device, CCNX_ETHERTYPE);
if (linkData->athenaEthernet == NULL) {
_ETHLinkData_Destroy(&linkData);
return NULL;
}
// Use specified source MAC address, or default to device MAC
if (source) {
memcpy(&(linkData->link.myAddress), source, sizeof(struct ether_addr));
} else {
athenaEthernet_GetMAC(linkData->athenaEthernet, &(linkData->link.myAddress));
}
linkData->link.myAddressLength = ETHER_ADDR_LEN;
if (linkData->athenaEthernet == NULL) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"athenaEthernet_Create error");
_ETHLinkData_Destroy(&linkData);
return NULL;
}
derivedLinkName = _createNameFromLinkData(&linkData->link, true);
if (linkName == NULL) {
linkName = derivedLinkName;
}
// Listener doesn't require a send method. The receive method is used to establish new connections.
AthenaTransportLink *athenaTransportLink = athenaTransportLink_Create(linkName,
NULL,
_ETHReceiveListener,
_ETHClose);
if (athenaTransportLink == NULL) {
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink),
"athenaTransportLink_Create failed");
parcMemory_Deallocate(&derivedLinkName);
_ETHLinkData_Destroy(&linkData);
return athenaTransportLink;
}
athenaTransportLink_SetPrivateData(athenaTransportLink, linkData);
athenaTransportLink_SetEventFd(athenaTransportLink, athenaEthernet_GetDescriptor(linkData->athenaEthernet));
// Links established for listening are not used to route messages.
// They can be kept in a listener list that doesn't consume a linkId.
athenaTransportLink_SetRoutable(athenaTransportLink, false);
parcLog_Info(athenaTransportLink_GetLogger(athenaTransportLink),
"new listener established: Name=\"%s\" (%s)", linkName, derivedLinkName);
parcMemory_Deallocate(&derivedLinkName);
return athenaTransportLink;
}
static AthenaTransportLink *
_ETHOpen(AthenaTransportLinkModule *athenaTransportLinkModule, PARCURI *connectionURI)
{
AthenaTransportLink *result = 0;
char device[NI_MAXHOST];
const char *authorityString = parcURI_GetAuthority(connectionURI);
if (authorityString == NULL) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Unable to parse connection authority %s", authorityString);
errno = EINVAL;
return NULL;
}
PARCURIAuthority *authority = parcURIAuthority_Parse(authorityString);
const char *URIHostname = parcURIAuthority_GetHostName(authority);
strcpy(device, URIHostname);
bool srcMACSpecified = false;
struct ether_addr srcMAC = { { 0 } };
struct ether_addr destMAC = { { 0 } };
if (_parseAddress(authorityString, &destMAC) != 0) {
parcURIAuthority_Release(&authority);
errno = EINVAL;
return NULL;
}
parcURIAuthority_Release(&authority);
bool isListener = false;
char *linkName = NULL;
char specifiedLinkName[MAXPATHLEN] = { 0 };
size_t mtu = 0;
int forceLocal = 0;
PARCURIPath *remainder = parcURI_GetPath(connectionURI);
size_t segments = parcURIPath_Count(remainder);
for (int i = 0; i < segments; i++) {
PARCURISegment *segment = parcURIPath_Get(remainder, i);
const char *token = parcURISegment_ToString(segment);
if (strcasecmp(token, ETH_LISTENER_FLAG) == 0) {
// Packet source for listener is destination parameter, unless told otherwise
if (srcMACSpecified == false) {
memcpy(&srcMAC, &destMAC, sizeof(struct ether_addr));
}
isListener = true;
parcMemory_Deallocate(&token);
continue;
}
if (strncasecmp(token, SRC_LINK_SPECIFIER, strlen(SRC_LINK_SPECIFIER)) == 0) {
if (_parseSrc(athenaTransportLinkModule, token, &srcMAC) != 0) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Improper connection source specification (%s)", token);
parcMemory_Deallocate(&token);
return NULL;
}
srcMACSpecified = true;
parcMemory_Deallocate(&token);
continue;
}
if (strncasecmp(token, LINK_MTU_SIZE, strlen(LINK_MTU_SIZE)) == 0) {
if (_parseMTU(token, &mtu) == -1) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Improper MTU specification (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
parcMemory_Deallocate(&token);
continue;
}
if (strncasecmp(token, LINK_NAME_SPECIFIER, strlen(LINK_NAME_SPECIFIER)) == 0) {
if (_parseLinkName(token, specifiedLinkName) != 0) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Improper connection name specification (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
linkName = specifiedLinkName;
parcMemory_Deallocate(&token);
continue;
}
if (strncasecmp(token, LOCAL_LINK_FLAG, strlen(LOCAL_LINK_FLAG)) == 0) {
forceLocal = _parseLocalFlag(token);
if (forceLocal == 0) {
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Improper local specification (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
parcMemory_Deallocate(&token);
continue;
}
parcLog_Error(athenaTransportLinkModule_GetLogger(athenaTransportLinkModule),
"Unknown connection parameter (%s)", token);
parcMemory_Deallocate(&token);
errno = EINVAL;
return NULL;
}
if (isListener) {
result = _ETHOpenListener(athenaTransportLinkModule, linkName, device, &srcMAC, mtu);
} else {
if (srcMACSpecified) {
result = _ETHOpenConnection(athenaTransportLinkModule, linkName, device, &srcMAC, &destMAC, mtu);
} else {
result = _ETHOpenConnection(athenaTransportLinkModule, linkName, device, NULL, &destMAC, mtu);
}
}
// forced IsLocal/IsNotLocal, mainly for testing
if (result && forceLocal) {
athenaTransportLink_ForceLocal(result, forceLocal);
}
return result;
}
static void
_processInterest(Athena *athena, CCNxInterest *interest, PARCBitVector *ingressVector)
{
uint8_t hoplimit;
//
// * (0) Hoplimit check, exclusively on interest messages
//
int linkId = parcBitVector_NextBitSet(ingressVector, 0);
if (athenaTransportLinkAdapter_IsNotLocal(athena->athenaTransportLinkAdapter, linkId)) {
hoplimit = ccnxInterest_GetHopLimit(interest);
if (hoplimit == 0) {
// We should never receive a message with a hoplimit of 0 from a non-local source.
parcLog_Error(athena->log,
"Received a message with a hoplimit of zero from a non-local source (%s).",
athenaTransportLinkAdapter_LinkIdToName(athena->athenaTransportLinkAdapter, linkId));
return;
}
ccnxInterest_SetHopLimit(interest, hoplimit - 1);
}
//
// * (1) if the interest is in the ContentStore, reply and return,
// assuming that other PIT entries were satisified when the content arrived.
//
CCNxMetaMessage *content = athenaContentStore_GetMatch(athena->athenaContentStore, interest);
if (content) {
const char *ingressVectorString = parcBitVector_ToString(ingressVector);
parcLog_Debug(athena->log, "Forwarding content from store to %s", ingressVectorString);
parcMemory_Deallocate(&ingressVectorString);
PARCBitVector *result = athenaTransportLinkAdapter_Send(athena->athenaTransportLinkAdapter, content, ingressVector);
if (result) { // failed channels - client will resend interest unless we wish to optimize things here
parcBitVector_Release(&result);
}
return;
}
//
// * (2) add it to the PIT, if it was aggregated or there was an error we're done, otherwise we
// forward the interest. The expectedReturnVector is populated with information we get from
// the FIB and used to verify content objects ingress ports when they arrive.
//
PARCBitVector *expectedReturnVector;
AthenaPITResolution result;
if ((result = athenaPIT_AddInterest(athena->athenaPIT, interest, ingressVector, &expectedReturnVector)) != AthenaPITResolution_Forward) {
if (result == AthenaPITResolution_Error) {
parcLog_Error(athena->log, "PIT resolution error");
}
return;
}
// Divert interests destined to the forwarder, we assume these are control messages
CCNxName *ccnxName = ccnxInterest_GetName(interest);
if (ccnxName_StartsWith(ccnxName, athena->athenaName) == true) {
_processInterestControl(athena, interest, ingressVector);
return;
}
//
// * (3) if it's in the FIB, forward, then update the PIT expectedReturnVector so we can verify
// when the returned object arrives that it came from an interface it was expected from.
// Interest messages with a hoplimit of 0 will never be sent out by the link adapter to a
// non-local interface so we need not check that here.
//
ccnxName = ccnxInterest_GetName(interest);
PARCBitVector *egressVector = athenaFIB_Lookup(athena->athenaFIB, ccnxName);
if (egressVector != NULL) {
// Remove the link the interest came from if it was included in the FIB entry
parcBitVector_ClearVector(egressVector, ingressVector);
// If no links remain, send a no route interest return message
if (parcBitVector_NumberOfBitsSet(egressVector) == 0) {
CCNxInterestReturn *interestReturn = ccnxInterestReturn_Create(interest, CCNxInterestReturn_ReturnCode_NoRoute);
PARCBitVector *result = athenaTransportLinkAdapter_Send(athena->athenaTransportLinkAdapter, interestReturn, ingressVector);
parcBitVector_Release(&result);
ccnxInterestReturn_Release(&interestReturn);
} else {
parcBitVector_SetVector(expectedReturnVector, egressVector);
PARCBitVector *result = athenaTransportLinkAdapter_Send(athena->athenaTransportLinkAdapter, interest, egressVector);
if (result) { // remove failed channels - client will resend interest unless we wish to optimize here
parcBitVector_ClearVector(expectedReturnVector, result);
parcBitVector_Release(&result);
}
}
} else {
// No FIB entry found, return a NoRoute interest return and remove the entry from the PIT.
CCNxInterestReturn *interestReturn = ccnxInterestReturn_Create(interest, CCNxInterestReturn_ReturnCode_NoRoute);
PARCBitVector *result = athenaTransportLinkAdapter_Send(athena->athenaTransportLinkAdapter, interestReturn, ingressVector);
parcBitVector_Release(&result);
ccnxInterestReturn_Release(&interestReturn);
const char *name = ccnxName_ToString(ccnxName);
if (athenaPIT_RemoveInterest(athena->athenaPIT, interest, ingressVector) != true) {
parcLog_Error(athena->log, "Unable to remove interest (%s) from the PIT.", name);
}
parcLog_Debug(athena->log, "Name (%s) not found in FIB and no default route. Message dropped.", name);
parcMemory_Deallocate(&name);
}
}
static AthenaTransportLinkModule *
_LoadModule(AthenaTransportLinkAdapter *athenaTransportLinkAdapter, const char *moduleName)
{
assertTrue(_LookupModule(athenaTransportLinkAdapter, moduleName) == NULL,
"attempt to load an already loaded module");
// Derive the entry initialization name from the provided module name
const char *moduleEntry;
moduleEntry = _moduleNameToInitMethod(moduleName);
// Check to see if the module was statically linked in.
void *linkModule = RTLD_DEFAULT;
ModuleInit _init = dlsym(linkModule, moduleEntry);
// If not statically linked in, look for a shared library and load it from there
if (_init == NULL) {
// Derive the library name from the provided module name
const char *moduleLibrary;
moduleLibrary = _moduleNameToLibrary(moduleName);
void *linkModule = dlopen(moduleLibrary, RTLD_NOW | RTLD_GLOBAL);
parcMemory_Deallocate(&moduleLibrary);
// If the shared library wasn't found, look for the symbol in our existing image. This
// allows a link module to be linked directly into Athena without modifying the forwarder.
if (linkModule == NULL) {
parcLog_Error(athenaTransportLinkAdapter_GetLogger(athenaTransportLinkAdapter),
"Unable to dlopen %s: %s", moduleName, dlerror());
parcMemory_Deallocate(&moduleEntry);
errno = ENOENT;
return NULL;
}
_init = dlsym(linkModule, moduleEntry);
if (_init == NULL) {
parcLog_Error(athenaTransportLinkAdapter_GetLogger(athenaTransportLinkAdapter),
"Unable to find %s module _init method: %s", moduleName, dlerror());
parcMemory_Deallocate(&moduleEntry);
dlclose(linkModule);
errno = ENOENT;
return NULL;
}
}
parcMemory_Deallocate(&moduleEntry);
// Call the initialization method.
PARCArrayList *moduleList = _init();
if (moduleList == NULL) { // if the init method fails, unload the module if it was loaded
parcLog_Error(athenaTransportLinkAdapter_GetLogger(athenaTransportLinkAdapter),
"Empty module list returned from %s module", moduleName);
if (linkModule != RTLD_DEFAULT) {
dlclose(linkModule);
}
errno = ENOENT;
return NULL;
}
// Process each link module instance (typically only one)
for (int index = 0; index < parcArrayList_Size(moduleList); index++) {
AthenaTransportLinkModule *athenaTransportLinkModule = parcArrayList_Get(moduleList, index);
_AddModule(athenaTransportLinkAdapter, athenaTransportLinkModule);
}
parcArrayList_Destroy(&moduleList);
return _LookupModule(athenaTransportLinkAdapter, moduleName);
}
static void
_parseCommandLine(Athena *athena, int argc, char **argv)
{
int c;
bool interfaceConfigured = false;
while ((c = getopt_long(argc, argv, "hs:c:vd", options, NULL)) != -1) {
switch (c) {
case 's': {
int sizeInMB = atoi(optarg);
if (athenaContentStore_SetCapacity(athena->athenaContentStore, sizeInMB) != true) {
parcLog_Error(athena->log, "Unable to resize content store to %d (MB)", sizeInMB);
}
_contentStoreSizeInMB = sizeInMB;
break;
}
case 'c': {
PARCURI *connectionURI = parcURI_Parse(optarg);
const char *result = athenaTransportLinkAdapter_Open(athena->athenaTransportLinkAdapter, connectionURI);
if (result == NULL) {
parcLog_Error(athena->log, "Unable to configure %s: %s", optarg, strerror(errno));
parcURI_Release(&connectionURI);
exit(EXIT_FAILURE);
}
parcURI_Release(&connectionURI);
interfaceConfigured = true;
break;
}
case 'v':
printf("%s\n", athenaAbout_Version());
exit(0);
case 'd':
athenaTransportLinkAdapter_SetLogLevel(athena->athenaTransportLinkAdapter, PARCLogLevel_Debug);
parcLog_SetLevel(athena->log, PARCLogLevel_Debug);
break;
case 'h':
default:
_usage();
exit(EXIT_FAILURE);
break;
}
}
if (argc - optind) {
parcLog_Error(athena->log, "Bad arguments");
_usage();
exit(EXIT_FAILURE);
}
if (interfaceConfigured != true) {
PARCURI *connectionURI = parcURI_Parse(_athenaDefaultConnectionURI);
if (athenaTransportLinkAdapter_Open(athena->athenaTransportLinkAdapter, connectionURI) == NULL) {
parcLog_Error(athena->log, "Unable to configure an interface. Exiting...");
parcURI_Release(&connectionURI);
exit(EXIT_FAILURE);
}
parcURI_Release(&connectionURI);
struct utsname name;
if (uname(&name) == 0) {
char nodeURIspecification[MAXPATHLEN];
sprintf(nodeURIspecification, "tcp://%s:%d/listener",
name.nodename, AthenaDefaultListenerPort);
PARCURI *nodeURI = parcURI_Parse(nodeURIspecification);
if (athenaTransportLinkAdapter_Open(athena->athenaTransportLinkAdapter, nodeURI) == NULL) {
parcURI_Release(&nodeURI);
}
}
}
}
static int
_ETHSend(AthenaTransportLink *athenaTransportLink, CCNxMetaMessage *ccnxMetaMessage)
{
struct _ETHLinkData *linkData = athenaTransportLink_GetPrivateData(athenaTransportLink);
if (ccnxTlvDictionary_GetSchemaVersion(ccnxMetaMessage) == CCNxTlvDictionary_SchemaVersion_V0) {
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink),
"sending deprecated version %d message\n", ccnxTlvDictionary_GetSchemaVersion(ccnxMetaMessage));
}
// Construct our header to prepend
struct ether_header header;
memcpy(header.ether_shost, &(linkData->link.myAddress), ETHER_ADDR_LEN * sizeof(uint8_t));
memcpy(header.ether_dhost, &(linkData->link.peerAddress), ETHER_ADDR_LEN * sizeof(uint8_t));
header.ether_type = htons(athenaEthernet_GetEtherType(linkData->athenaEthernet));
// An iovec to contain the header and packet data
struct iovec iov[2];
struct iovec *array = iov;
int iovcnt = 2;
size_t messageLength = 0;
// If the iovec we're prepending to has more than one element, allocatedIovec holds the
// allocated IO vector of the right size that we must deallocate before returning.
struct iovec *allocatedIovec = NULL;
// Attach the header and populate the iovec
CCNxCodecNetworkBufferIoVec *iovec = athenaTransportLinkModule_GetMessageIoVector(ccnxMetaMessage);
iovcnt = ccnxCodecNetworkBufferIoVec_GetCount((CCNxCodecNetworkBufferIoVec *) iovec);
const struct iovec *networkBufferIovec = ccnxCodecNetworkBufferIoVec_GetArray((CCNxCodecNetworkBufferIoVec *) iovec);
// Trivial case, single iovec element.
if (iovcnt == 1) {
// Header
array[0].iov_len = sizeof(struct ether_header);
array[0].iov_base = &header;
// Message content
array[1].iov_len = networkBufferIovec->iov_len;
array[1].iov_base = networkBufferIovec->iov_base;
messageLength = array[0].iov_len + array[1].iov_len;
} else {
// Allocate a new iovec if more than one vector
allocatedIovec = parcMemory_Allocate(sizeof(struct iovec) * (iovcnt + 1));
array = allocatedIovec;
// Header
array[0].iov_len = sizeof(struct ether_header);
array[0].iov_base = &header;
messageLength = array[0].iov_len;
// Append message content
for (int i = 0; i < iovcnt; i++) {
array[i + 1].iov_len = networkBufferIovec[i].iov_len;
array[i + 1].iov_base = networkBufferIovec[i].iov_base;
messageLength += array[i + 1].iov_len;
}
}
iovcnt++; // increment for the header
if (linkData->link.mtu) {
if (messageLength > linkData->link.mtu) {
if (allocatedIovec != NULL) {
parcMemory_Deallocate(&allocatedIovec);
}
ccnxCodecNetworkBufferIoVec_Release(&iovec);
errno = EMSGSIZE;
return -1;
}
}
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink),
"sending message (size=%d)", messageLength);
ssize_t writeCount = 0;
writeCount = athenaEthernet_Send(linkData->athenaEthernet, array, iovcnt);
ccnxCodecNetworkBufferIoVec_Release(&iovec);
// Free up any storage allocated for a non-singular iovec
if (allocatedIovec != NULL) {
parcMemory_Deallocate(&allocatedIovec);
array = NULL;
}
// on error close the link, else return to retry a zero write
if (writeCount == -1) {
if ((errno == EAGAIN) || (errno == EINTR)) {
parcLog_Info(athenaTransportLink_GetLogger(athenaTransportLink), "send retry");
linkData->_stats.send_Retry++;
return -1;
}
athenaTransportLink_SetEvent(athenaTransportLink, AthenaTransportLinkEvent_Error);
parcLog_Error(athenaTransportLink_GetLogger(athenaTransportLink),
"send error (%s)", strerror(errno));
linkData->_stats.send_Error++;
return -1;
}
// Short write
if (writeCount != messageLength) {
linkData->_stats.send_ShortWrite++;
parcLog_Debug(athenaTransportLink_GetLogger(athenaTransportLink), "short write");
return -1;
}
return 0;
}
