RTM Project

Sync/sync.c

@@ -0,0 +1,141 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/unistd.h>
+#include <sys/mman.h> // for unlink
+#include <errno.h>
+
+#include "dll.h"
+#include "sync.h"
+
+/*
+* Makes changes to a routing table or mac list based on the
+* instructions encoded in sync_msg.
+*/
+
+void process_sync_mesg(dll_t* dll, sync_msg_t* sync_msg) {
+
+	dll_node_t* node;
+	if (sync_msg->l_code == L3) {
+		node = find_routing_table_entry(dll, 
+			sync_msg->msg_body.routing_table_entry.dest,
+			sync_msg->msg_body.routing_table_entry.mask);
+
+		switch (sync_msg->op_code) {
+		case CREATE:
+			
+			if (node == dll->head) {
+				append(dll, &sync_msg->msg_body.routing_table_entry);
+				
+				node = find_routing_table_entry(dll,
+					sync_msg->msg_body.routing_table_entry.dest,
+					sync_msg->msg_body.routing_table_entry.mask);
+
+				if (node != dll->head) {
+					routing_table_entry_t entry = *((routing_table_entry_t*)node->data);
+
+					printf("Added Destination IP: %s mask: %u Gateway IP: %s OIF: %s\n",
+						entry.dest,
+						entry.mask,
+						entry.gw,
+						entry.oif);
+				}
+			}
+			break;
+
+		case UPDATE:
+
+			if (node != dll->head) {
+				update(node,
+					sync_msg->msg_body.routing_table_entry.gw,
+					sync_msg->msg_body.routing_table_entry.oif);
+				
+				node = find_routing_table_entry(dll,
+					sync_msg->msg_body.routing_table_entry.dest,
+					sync_msg->msg_body.routing_table_entry.mask);
+
+				if (node != dll->head) {
+					routing_table_entry_t entry = *((routing_table_entry_t*)node->data);
+
+					printf("Updated Destination IP: %s mask: %u Gateway IP: %s OIF: %s\n",
+						entry.dest,
+						entry.mask,
+						entry.gw,
+						entry.oif);
+				}
+			}
+
+			break;
+
+		case DELETE:
+
+			if (node != dll->head) {
+				del(dll, node);
+				node = find_routing_table_entry(dll,
+					sync_msg->msg_body.routing_table_entry.dest,
+					sync_msg->msg_body.routing_table_entry.mask);
+
+				if (node == dll->head) {
+					printf("Deleted Destination IP: %s mask: %u\n",
+						sync_msg->msg_body.routing_table_entry.dest,
+						sync_msg->msg_body.routing_table_entry.mask);
+				}
+			}
+
+			break;
+
+		default:
+
+			break;
+		}
+	}
+	else {
+		node = find_mac(dll,
+			sync_msg->msg_body.mac_list_entry.mac);
+
+		switch (sync_msg->op_code) {
+			
+		case CREATE:
+
+			if (node == dll->head) {
+				append(dll, &sync_msg->msg_body.mac_list_entry);
+				node = find_mac(dll,
+					sync_msg->msg_body.mac_list_entry.mac);
+
+				if (node != dll->head) {
+					mac_list_entry_t entry = *((mac_list_entry_t*)node->data);
+					printf("Added MAC: %s", entry.mac);
+					char ip[IP_ADDR_LEN];
+
+					if (get_IP(entry.mac, ip) != -1) {
+						printf("IP: %s", ip);
+					}
+
+					putchar('\n');
+				}
+			}
+
+			break;
+
+		case DELETE:
+
+			if (node == dll->head) {
+				del(dll, node);
+				node = find_mac(dll,
+					sync_msg->msg_body.mac_list_entry.mac);
+
+				if (node == dll->head) {
+					printf("Deleted: MAC: %s\n",
+						sync_msg->msg_body.mac_list_entry.mac);
+					unlink(sync_msg->msg_body.mac_list_entry.mac);
+					//deallocate shared memory region corresponding to this MAC key.
+				}
+			}
+
+			break;
+
+		default:
+
+			break;
+		}
+	}
+}