import re from NetworkAnalog.SimObjs import SimBase, AllSimConnect, SimRouter, SimHost class SimPacket(): # 需要补充至编程13.7当中 def __init__(self, source_ip, source_mac, destination_ip, message=None, ping=False): """ :param source_mac: 源主机mac地址 :param source_ip: 源主机ip地址 :param destination_mac: 目的主机mac地址 :param destination_ip: 目的主机ip地址 :param message: 数据 """ self.source_mac = source_mac self.source_ip = source_ip self.destination_ip = destination_ip self.message = message self.up_jump = None # 上一跳连接对象 self.ping = ping self.flag = False # 是否传输成功 class SimHost(SimBase): def receive(self, packet: SimPacket): # 修改编程13.7中SimHost的receive方法 # 判断目的IP是否与本机IP一致，以及判断当前主机是否联网 if packet.destination_ip == self.interface[0]["ip"] and self.network_online: print(f"主机{self.ObjLabel}接受到数据{packet.message}") packet.flag = True # 将packet的传输状态改为True，视为传输成功 else: print(f"数据传输失败") def validate_ip_address(ip_address):# 定义IP地址的正则表达式模式 pattern_with_subnet = r'^(\d{1,3})\.(\d{1,3})\.(' \ r'\d{1,3})\.(\d{1,3})/(\d{1,2})$' pattern_without_subnet = r'^(\d{1,3})\.(\d{1,3})' \ r'\.(\d{1,3})\.(\d{1,3})$' match_with_subnet = re.match(pattern_with_subnet, ip_address) # 使用re模块进行匹配 match_without_subnet = re.match(pattern_without_subnet, ip_address) if match_with_subnet: # 带有子网掩码的IP地址 # 检查每个组件的取值范围是否在 0-255 之间 for group in match_with_subnet.groups()[:4]: if not (0 <= int(group) <= 255): return False subnet_mask = int(match_with_subnet.groups()[4]) # 检查子网掩码的取值范围是否在 0-32 之间 if not (0 <= subnet_mask <= 32): return False return True elif match_without_subnet: # 不带子网掩码的IP地址 for group in match_without_subnet.groups(): if not (0 <= int(group) <= 255): return False return True else: return False # IP地址格式不正确 def is_same_subnet(ip1, ip2): # 判断两个IP地址是否属于同一网段 # 将IP地址和子网掩码转换为整数列表 ip1_parts = [int(part) for part in ip1.split('.')] ip2_parts = [int(part) for part in ip2.split('.')] subnet_mask_parts = [int(part) for part in "255.255.255.0".split('.')] # 计算网络地址 network1 = [ip1_parts[i] & subnet_mask_parts[i] for i in range(4)] network2 = [ip2_parts[i] & subnet_mask_parts[i] for i in range(4)] # 比较网络地址是否相同 return network1 == network2 class NetworkAnalog(): ... def check_network(self): # 判断各网络节点是否配置正确 flag = True sim_host_list = [] for key, tag in self.AllSimObjs.items(): # 遍历所有组件 # todo: 判断主机的ip配置是否都合格 if tag.ObjType == 1: # 如果该组件为主机 for interface in tag.interface: # 遍历该主机下所有接口 index = tag.interface.index(interface) + 1 # 获取当前接口号 ip_ = interface["ip"] # 获取当前接口IP if not validate_ip_address(ip_): # 判断主机配置的IP是否正确 self.message.show_message(f"主机{tag.ObjLabel}的接口{index} IP 配置错误") flag = False sim_host_list.append(tag) # 将所有主机组件添加到列表中 # todo: 判断路由器的四个接口是否都在同一网段下 if tag.ObjType == 2: # 如果当前组件为路由器 ip_ = tag.interface[0]["ip"] # 将第一个接口设为默认 for interface in tag.interface: # 遍历所有接口 index = tag.interface.index(interface) + 1 # 获取当前接口号 if not is_same_subnet(ip_, interface["ip"]): # 判断所有接口是否在同一网段下 self.message.show_message(f"路由器{tag.ObjLabel}中接口{index}不在同一网段下") flag = False # todo: 检查路由表是否能跳转到下一跳 if tag.ObjType == 2: # 如果当前组件为路由器 for conn in tag.connections: # 遍历该组件所有链接线 next_jump = conn.NobjE # 获取下一跳组件 if not is_same_subnet(tag.interface[conn.IfsS]["ip"], next_jump.interface[conn.IfsE]["ip"]): # 检查路由表是否能跳转到下一跳 self.message.show_message(f"路由器组件{tag.ObjLabel}路由表配置错误，请检查") flag = False # todo: 判断从所有主机发送数据包到其他所有主机能否成功 for sim_host in sim_host_list: # 遍历所有主机组件 sim_host: SimHost = sim_host for destination_sim_host in sim_host_list: # 遍历所有主机组件 packet = SimPacket(sim_host.interface[0]['ip'], sim_host.interface[0]['mac'], destination_sim_host.interface[0]["ip"]) # 封装数据包，将发送主机信息和接收主机信息封装到数据包中 sim_host.send(packet) # 模拟发送 if not packet.flag: # 判断是否传输成功 self.message.show_message(f"主机{sim_host.ObjLabel}传输至{destination_sim_host.ObjLabel}失败，请检查配置！") return flag