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);
}
// 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);
}
}
}
}
}
/*
* Main loop of the host node
*
* It polls the manager connection for any requests from
* the manager, and replies
*
* Then it polls any incoming links and downloads any
* incoming packets to its receive packet buffer
*
* Then it sleeps for 10 milliseconds
*
* Then back to the top of the loop
*
*/
void hostMain(hostState * hstate)
{
char buffer[1000]; /* The message from the manager */
char word[1000];
int value;
char replymsg[1000]; /* Reply message to be displayed at the manager */
packetBuffer tmpbuff;
int length = 0; /* Size of string in pipe */
while(1) {
/* Check if there is a command message from the manager */
length = hostCommandReceive(&(hstate->manLink),buffer);
if (length > 1) { /* Execute the manager's command */
findWord(word, buffer, 1);
if (strcmp(word, "SetNetAddr")==0) {
findWord(word, buffer, 2); /* Find net address */
value = ascii2Int(word); /* Convert it to integer */
hostSetNetAddr(hstate, value, replymsg);
hostReplySend(&(hstate->manLink),"DISPLAY",replymsg);
}
else if (strcmp(word, "SetMainDir")==0) {
findWord(word, buffer, 2); /* Find directory name */
hostSetMainDir(hstate, word, replymsg);
hostReplySend(&(hstate->manLink),"DISPLAY",replymsg);
}
else if (strcmp(word, "ClearRcvFlg")==0) {
hostClearRcvFlg(hstate, replymsg);
hostReplySend(&(hstate->manLink),"DISPLAY",replymsg);
}
else if (strcmp(word, "UploadPacket")==0) {
findWord(word, buffer, 2); /* Find file name */
hostUploadPacket(hstate, word, replymsg);
hostReplySend(&(hstate->manLink), "DISPLAY",replymsg);
}
else if (strcmp(word, "DownloadPacket")==0) {
findWord(word, buffer, 2); /* Find file name */
hostDownloadPacket(hstate, word, replymsg);
hostReplySend(&(hstate->manLink), "DISPLAY",replymsg);
}
else if (strcmp(word, "GetHostState")==0) {
hostGetHostState(hstate, &(hstate->manLink), replymsg);
hostReplySend(&(hstate->manLink), "GetHostStateAck",replymsg);
}
else if (strcmp(word, "TransmitPacket")==0) {
hostInitTransmit(hstate, buffer, replymsg);
hostReplySend(&(hstate->manLink), "DISPLAY",replymsg);
}
} /* end of if */
if (hstate->sendBuffer.busy == 1) {
hostTransmitPacket(hstate, replymsg);
}
/* Check if there is an incoming packet */
length = linkReceive(&(hstate->linkin), &tmpbuff);
/*
* If there is a packet and if the packet's destination address
* is the host's network address then store the packet in the
* receive packet buffer
*/
if (tmpbuff.dstaddr == hstate->netaddr && tmpbuff.valid == 1) {
/* if there is already something in the buffer; clear it */
if (tmpbuff.start == 1) {
memset(hstate->rcvBuffer.data, 0, sizeof(hstate->rcvBuffer.data));
hstate->rcvBuffer.length = 0;
hstate->rcvflag = 0;
}
strcat(hstate->rcvBuffer.data, tmpbuff.payload);
hstate->rcvBuffer.length += tmpbuff.length;
hstate->rcvBuffer.srcaddr = tmpbuff.srcaddr;
hstate->rcvBuffer.dstaddr = tmpbuff.dstaddr;
if (tmpbuff.end == 1) {
hstate->rcvflag = 1;
hstate->rcvBuffer.valid = 1;
}
}
/* The host goes to sleep for 10 ms */
usleep(TENMILLISEC);
} /* End of while loop */
}
