static void
_setConnectLinkState(AthenaTransportLink *athenaTransportLink, _UDPLinkData *linkData)
{
athenaTransportLink_SetPrivateData(athenaTransportLink, linkData);
// Register file descriptor to be polled. This must be set before adding the link (case ???).
athenaTransportLink_SetEventFd(athenaTransportLink, linkData->fd);
// Determine and flag the link cost for forwarding messages.
// Messages without sufficient hop count collateral will be dropped.
// Local links will always be allowed to be taken (i.e. localhost).
bool isLocal = false;
if (linkData->link.peerAddress.sin_addr.s_addr == linkData->link.myAddress.sin_addr.s_addr) { // a local connection
isLocal = true;
}
athenaTransportLink_SetLocal(athenaTransportLink, isLocal);
}
static void
_setConnectLinkState(AthenaTransportLink *athenaTransportLink, _ETHLinkData *linkData)
{
athenaTransportLink_SetPrivateData(athenaTransportLink, linkData);
// Register file descriptor to be polled. This must be set before adding the link (case ???).
athenaTransportLink_SetEventFd(athenaTransportLink, athenaEthernet_GetDescriptor(linkData->athenaEthernet));
// Determine and flag the link cost for forwarding messages.
// Messages without sufficient hop count collateral will be dropped.
// Local links will always be allowed to be taken (i.e. localhost).
bool isLocal = false;
if (memcmp(&(linkData->link.peerAddress), &(linkData->link.myAddress), sizeof(struct ether_addr)) == 0) { // a local connection
isLocal = true;
}
athenaTransportLink_SetLocal(athenaTransportLink, isLocal);
}
//
// 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;
}
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;
}
