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/*
 * handle_packet
 *   DESCRIPTION: Called when this system has received a data packet. This
 *                function parses the packet and calls the requested function.
 *   INPUTS: TBD
 *   OUTPUTS: 0 on success, -1 on failure
 */
int handle_packet() {
    int packet_function;
    int result;
    addr_t sender_addr;
    packet_t* rcvd_packet;  // pointer to malloc'd packet
    switch(packet_function) {
        case DATABLOCK_REQUEST:
            result = handle_datablock_request();
            break;
        case ADDR_REQUEST:
            result = handle_addr_request(sender_addr);
        case NODE_ADDED:
            result = handle_node_join(rcvd_packet);
            break;
        case NODE_REMOVED:
            result = handle_node_leave(0, rcvd_packet);
            break;
    }
    if(result == -1) { // fatal error
        return -1;
    }
    if(result == -2) {  // non-fatal error
        return 0;
    }
    return 0;
}