python网络编程测试－broadcast

话说几天没上博客，总是觉的少点什么东西（因为抓了个小偷），今天来说说最近写的小测试吧，以后似乎大项目上改改就可以了

1 broadcast：（以下均使用IPv4 ， no v6，当然更没v5）

广播对于路由来说是至关重要的，涉及的网络知识这里就不多介绍了，先看看code，看看Python中对于广播的处理

host：（接收广播包，并进行应答）

[python] def hostBroadcastRecv():
host = ''
print('input the port number for recieving broadcast data:')
port = sys.stdin.readline().rstrip()

s = socket.socket(socket.AF_INET , socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET , socket.SO_REUSEADDR , 1)
s.setsockopt(socket.SOL_SOCKET , socket.SO_BROADCAST , 1)
s.bind((host , int(port)))

while True:
    try:
      mess , addr = s.recvfrom(1024)
      print('got data from broadcast')
      s.sendto('got your broadcast' , addr)

    except (KeyboardInterrupt , SystemExit):
      print('terminate the procedure?')
      flag = sys.stdin.readline().rstrip()
      if(flag == 'yes') or (flag == 'y'):
        sys.exit(1)
      else:
        continue
    except:
      traceback.print_exc()
def hostBroadcastRecv():
host = ''
print('input the port number for recieving broadcast data:')
port = sys.stdin.readline().rstrip()

s = socket.socket(socket.AF_INET , socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET , socket.SO_REUSEADDR , 1)
s.setsockopt(socket.SOL_SOCKET , socket.SO_BROADCAST , 1)
s.bind((host , int(port)))

while True:
try:
   mess , addr = s.recvfrom(1024)
   print('got data from broadcast')
   s.sendto('got your broadcast' , addr)

except (KeyboardInterrupt , SystemExit):
   print('terminate the procedure?')
   flag = sys.stdin.readline().rstrip()
   if(flag == 'yes') or (flag == 'y'):
  sys.exit(1)
   else:
  continue
except:
   traceback.print_exc()
client：（发出广播包）

[python]def sendBroadcastData():
print('input the data for sending...')
data = sys.stdin.readline().rstrip()

try:
    dest = ('<broadcast>' , 5522)
    s = socket.socket(socket.AF_INET , socket.SOCK_DGRAM)
    s.setsockopt(socket.SOL_SOCKET , socket.SO_BROADCAST, 1)

    s.sendto('testing...' , dest)

    mess , addr = s.recvfrom(1024)
    print(str(mess))
except (KeyboardInterrupt , SystemExit):
    print('terminate the procedure?')
    flag = sys.stdin.readline().rstrip()
    if((flag == 'yes') or (flag == 'y')):
      sys.exit(1)
    else:
      continue
except:
    sys.exit(1)
def sendBroadcastData():
print('input the data for sending...')
data = sys.stdin.readline().rstrip()

try:
dest = ('<broadcast>' , 5522)
    s = socket.socket(socket.AF_INET , socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET , socket.SO_BROADCAST, 1)

s.sendto('testing...' , dest)

    mess , addr = s.recvfrom(1024)
    print(str(mess))
except (KeyboardInterrupt , SystemExit):
print('terminate the procedure?')
flag = sys.stdin.readline().rstrip()
if((flag == 'yes') or (flag == 'y')):
   sys.exit(1)
else:
   continue
except:
sys.exit(1)

有些时候，我们要求应用具有单向传输的功能（这里所说的并非半双工，或者双工），那么通过Python中的shutdown可以达到我们的目的（是否有其他方法还不清楚，望牛人指点）

socket.shutdown(int) 函数用来说明怎样关闭socket switch（int）：

case 0：禁止将来读

case 1：禁止将来写

case 2：禁止将来的读和写（”将来“说明，该函数并不会对现在所处理的请求发生作用）

通常在以下情况下会使用这种办开放socket：

1 确保所有的已经写好的数据发出

2 捕获潜在的程序错误

3 程序中使用了fork（）或多线程，并且像防止其他进程的某些操作。

4 立即关闭socket

摘自 FishinLab的专栏

补充：Web开发 , Python ,