void worker_schedulePacket(Packet* packet) {
/* get our thread-private worker */
Worker* worker = _worker_getPrivate();
if(slave_isKilled(worker->slave)) {
/* the simulation is over, don't bother */
return;
}
in_addr_t srcIP = packet_getSourceIP(packet);
in_addr_t dstIP = packet_getDestinationIP(packet);
Address* srcAddress = dns_resolveIPToAddress(worker_getDNS(), (guint32) srcIP);
Address* dstAddress = dns_resolveIPToAddress(worker_getDNS(), (guint32) dstIP);
if(!srcAddress || !dstAddress) {
error("unable to schedule packet because of null addresses");
return;
}
/* check if network reliability forces us to 'drop' the packet */
gdouble reliability = topology_getReliability(worker_getTopology(), srcAddress, dstAddress);
Random* random = host_getRandom(worker_getCurrentHost());
gdouble chance = random_nextDouble(random);
/* don't drop control packets with length 0, otherwise congestion
* control has problems responding to packet loss */
if(chance <= reliability || packet_getPayloadLength(packet) == 0) {
/* the sender's packet will make it through, find latency */
gdouble latency = topology_getLatency(worker_getTopology(), srcAddress, dstAddress);
SimulationTime delay = (SimulationTime) ceil(latency * SIMTIME_ONE_MILLISECOND);
PacketArrivedEvent* event = packetarrived_new(packet);
worker_scheduleEvent((Event*)event, delay, (GQuark)address_getID(dstAddress));
packet_addDeliveryStatus(packet, PDS_INET_SENT);
} else {
packet_addDeliveryStatus(packet, PDS_INET_DROPPED);
}
}
gint host_connectToPeer(Host* host, gint handle, const struct sockaddr* address) {
MAGIC_ASSERT(host);
sa_family_t family = 0;
in_addr_t peerIP = 0;
in_port_t peerPort = 0;
if(address->sa_family == AF_INET) {
struct sockaddr_in* saddr = (struct sockaddr_in*) address;
family = saddr->sin_family;
peerIP = saddr->sin_addr.s_addr;
peerPort = saddr->sin_port;
} else if (address->sa_family == AF_UNIX) {
struct sockaddr_un* saddr = (struct sockaddr_un*) address;
family = saddr->sun_family;
gchar* sockpath = saddr->sun_path;
peerIP = htonl(INADDR_LOOPBACK);
gpointer val = g_hash_table_lookup(host->unixPathToPortMap, sockpath);
if(val) {
peerPort = (in_port_t)GPOINTER_TO_UINT(val);
}
}
in_addr_t loIP = htonl(INADDR_LOOPBACK);
/* make sure we will be able to route this later */
if(peerIP != loIP) {
Address* myAddress = networkinterface_getAddress(host->defaultInterface);
Address* peerAddress = dns_resolveIPToAddress(worker_getDNS(), peerIP);
if(!peerAddress || !topology_isRoutable(worker_getTopology(), myAddress, peerAddress)) {
/* can't route it - there is no node with this address */
gchar* peerAddressString = address_ipToNewString(peerIP);
warning("attempting to connect to address '%s:%u' for which no host exists", peerAddressString, ntohs(peerPort));
g_free(peerAddressString);
return ECONNREFUSED;
}
}
Descriptor* descriptor = host_lookupDescriptor(host, handle);
if(descriptor == NULL) {
warning("descriptor handle '%i' not found", handle);
return EBADF;
}
DescriptorStatus status = descriptor_getStatus(descriptor);
if(status & DS_CLOSED) {
warning("descriptor handle '%i' not a valid open descriptor", handle);
return EBADF;
}
DescriptorType type = descriptor_getType(descriptor);
if(type != DT_TCPSOCKET && type != DT_UDPSOCKET) {
warning("wrong type for descriptor handle '%i'", handle);
return ENOTSOCK;
}
Socket* socket = (Socket*) descriptor;
if(!socket_isFamilySupported(socket, family)) {
return EAFNOSUPPORT;
}
if(type == DT_TCPSOCKET) {
gint error = tcp_getConnectError((TCP*)socket);
if(error) {
return error;
}
}
if (address->sa_family == AF_UNIX) {
struct sockaddr_un* saddr = (struct sockaddr_un*) address;
socket_setUnixPath(socket, saddr->sun_path, FALSE);
}
if(!socket_isBound(socket)) {
/* do an implicit bind to a random port.
* use default interface unless the remote peer is on loopback */
in_addr_t defaultIP = networkinterface_getIPAddress(host->defaultInterface);
in_addr_t bindAddress = loIP == peerIP ? loIP : defaultIP;
in_port_t bindPort = _host_getRandomFreePort(host, bindAddress, type);
if(!bindPort) {
return EADDRNOTAVAIL;
}
_host_associateInterface(host, socket, bindAddress, bindPort);
}
return socket_connectToPeer(socket, peerIP, peerPort, family);
}