void hostSetName(hostState * hstate, char hname[], char replymsg[])
{
/* Message to the manager */
strcpy(replymsg, "Attempting to register name on DNS");
/* Packet to DNS */
packetBuffer temp;
strcpy(temp.payload, hname);
temp.type = 2; /* Should be 2 */
temp.valid = 1;
temp.srcaddr = hstate->physid;
temp.dstaddr = 100;/* Address of DNS */
temp.length = strlen(hname);
temp.payload[temp.length] = '\0';
linkSend(&(hstate->linkout), &temp);
hostReplySend(&(hstate->manLink), "DISPLAY",replymsg);
strcpy(replymsg, ""); //Clear reply buffer
packetBuffer rcv;
hostInitRcvPacketBuff(&rcv);
int size = 0;
size = linkReceive(&(hstate->linkin), &rcv);
while(rcv.type != 3 || rcv.valid != 1 || rcv.dstaddr != hstate->netaddr) {
size = linkReceive(&(hstate->linkin), &rcv);
}
if (rcv.flag == 1) {
strcpy(replymsg, "Host name succesfully registered.");
} else {
strcpy(replymsg, "Host name failed to register.");
}
hostReplySend(&(hstate->manLink), "DISPLAY",replymsg);
}
void hostReqAddr(hostState * hstate, char hname[], char replymsg[])
{
/* Packet to DNS */
packetBuffer temp;
strcpy(temp.payload, hname);
temp.type = 4; /* Should be 4 */
temp.valid = 1;
temp.srcaddr = hstate->physid;
temp.dstaddr = 100;/* Address of DNS */
temp.length = strlen(hname);
temp.payload[temp.length] = '\0';
linkSend(&(hstate->linkout), &temp);
strcpy(replymsg, ""); //Clear reply buffer
packetBuffer rcv;
hostInitRcvPacketBuff(&rcv);
int size = 0;
size = linkReceive(&(hstate->linkin), &rcv);
while(rcv.type != 5 || rcv.valid != 1 || rcv.dstaddr != hstate->netaddr) {
size = linkReceive(&(hstate->linkin), &rcv);
}
char buff[20];
buff[0] = '\0'; //init to blank
int2Ascii(buff, rcv.dnsaddr);
if (rcv.dnsaddr != 255) {
strcpy(replymsg, "Host address is ");
strcat(replymsg, " ");
strcat(replymsg, buff);
} else {
strcpy(replymsg, "Name did not match any host registered on DNS Server \n");
}
hostReplySend(&(hstate->manLink), "DISPLAY",replymsg);
}
/*
* hostTransmitPacket will transmit a packet in the send packet buffer
*/
void hostTransmitPacket(hostState * hstate, char replymsg[])
{
int i = 0;
int length = hstate->sendBuffer.length - hstate->sendBuffer.pos;
int error = 0;
if (length > PAYLOAD_LENGTH) {
length = PAYLOAD_LENGTH;
}
/*
* Set up the send packet buffer's source and destination addresses
*/
hstate->sendPacketBuff.dstaddr = hstate->sendBuffer.dstaddr;
hstate->sendPacketBuff.srcaddr = hstate->netaddr;
hstate->sendPacketBuff.length = length;
hstate->sendPacketBuff.type = 0;
hstate->sendPacketBuff.end = 0;
hstate->sendPacketBuff.start = 0;
hstate->sendPacketBuff.root = 0;
hstate->sendPacketBuff.distance = 0;
if (hstate->sendBuffer.pos == 0) {
hstate->sendPacketBuff.start = 1;
}
if (hstate->sendBuffer.valid) {
hstate->sendPacketBuff.valid = 1;
}
for (i = 0; i < length; i++) {
hstate->sendPacketBuff.payload[i] =
hstate->sendBuffer.data[i+hstate->sendBuffer.pos];
}
hstate->sendBuffer.pos += length;
if (hstate->sendBuffer.pos >= hstate->sendBuffer.length) {
hstate->sendBuffer.pos = 0;
hstate->sendBuffer.busy = 0;
hstate->sendPacketBuff.end = 1;
}
/* Transmit the packet on the link */
error = linkSend(&(hstate->linkout), &(hstate->sendPacketBuff));
if (error == -1) {
strcpy(replymsg,"Error: Could not send packet, aborting transmit");
hostInitDataBuffer(&(hstate->sendBuffer));
return;
}
if (hstate->sendPacketBuff.end == 1) {
strcpy(replymsg,"Final Packet Sent");
} else {
/* Message to be sent back to the manager */
strcpy(replymsg,"Packet sent");
}
}
// main loop for the switch
void switchMain(struct switchState * sstate){
int i,j;
packetBuffer tempbuff;
while(1){
for(i = 0; i < NUMHOSTS; i++){
linkReceive(&(sstate->linkin[i]),&tempbuff);
if(tempbuff.valid != 0){
for(j = 0; j < NUMHOSTS; j++){
if(j != i) linkSend(&(sstate->linkout[j]), &tempbuff);
}
}
}
}
}
void hostRequestFile(hostState * hstate, char filename[], int addr)
{
packetBuffer temp;
strcpy(temp.payload, filename);
temp.type = 6;
temp.valid = 1;
temp.srcaddr = hstate->physid;
temp.dstaddr = addr;
temp.length = strlen(filename);
temp.payload[temp.length] = '\0';
linkSend(&(hstate->linkout), &temp);
char reply[1000];
strcpy(reply, "File request sent..\n");
hostReplySend(&(hstate->manLink), "DISPLAY", reply);
}
void hostSilentTransmitPacket(hostState * hstate)
{
int i = 0;
int length = hstate->sendBuffer.length - hstate->sendBuffer.pos;
int error = 0;
if (length > PAYLOAD_LENGTH) {
length = PAYLOAD_LENGTH;
}
hstate->sendPacketBuff.dstaddr = hstate->sendBuffer.dstaddr;
hstate->sendPacketBuff.srcaddr = hstate->netaddr;
hstate->sendPacketBuff.length = length;
hstate->sendPacketBuff.type = 0;
hstate->sendPacketBuff.end = 0;
hstate->sendPacketBuff.start = 0;
hstate->sendPacketBuff.root = 0;
hstate->sendPacketBuff.distance = 0;
if (hstate->sendBuffer.pos == 0) {
hstate->sendPacketBuff.start = 1;
}
if (hstate->sendBuffer.valid) {
hstate->sendPacketBuff.valid = 1;
}
for (i = 0; i < length; i++) {
hstate->sendPacketBuff.payload[i] =
hstate->sendBuffer.data[i+hstate->sendBuffer.pos];
}
hstate->sendBuffer.pos += length;
if (hstate->sendBuffer.pos >= hstate->sendBuffer.length) {
hstate->sendBuffer.pos = 0;
hstate->sendBuffer.busy = 0;
hstate->sendPacketBuff.end = 1;
}
error = linkSend(&(hstate->linkout), &(hstate->sendPacketBuff));
if (error == -1) {
hostInitDataBuffer(&(hstate->sendBuffer));
return;
}
}