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mask(m,p) : trouver l’adresse ip d’un sous réseau à partir d’une ip locale (p) et d’un masque (m)

rand() : renvoie une ip locale et un masques générés aléatoirement sous forme d’appel à mask()

Le script propose une courte description ainsi que deux exemples lors de son importation.

Note : les adresses ip et les masques sont spécifiés sous forme de listes (tuple) d’int-s, par exemple 192.168.0.1 s’écrit (192, 168, 0, 1) et 255.255.248.0 s’écrit (255, 255, 248, 0)

from random import randint as rd

def mask(m,p):
  # (mask)*4, (ip)*4
  s=[[0,]*8]*4
  mb=[[0,]*8]*4
  pb=[[0,]*8]*4
  for i in range(4):
    mb[i]=bin(m[i])[2:]
    pb[i]=bin(p[i])[2:]
    
    for j in range(8-len(mb[i])):
      mb[i]="0"+mb[i]
    for j in range(8-len(pb[i])):
      pb[i]="0"+pb[i]
  
  print("\nRECAP")
  print(" ",".".join(str(x) for x in p),"ipv4:")
  print(" ",".".join(str(x) for x in pb))
  print(" ",".".join(str(x) for x in m),"mask:")
  print(" ",".".join(str(x) for x in mb),end="\n\n")

  denom=["st","nd","th"]
  for i in range(4):
    xnom=denom[i] if i<len(denom) else denom[-1]
    print(i+1,xnom,"byte ",end="")
    print(" ",mb[i]+" & "+pb[i],end="")
    for j in range(8):
      s[i][j]=1*(mb[i][j]=="1" and pb[i][j]=="1")
    
    s[i]="".join(str(x) for x in s[i])
    print(":",s[i])
  
  print("\nENDED, local network ip:")
  print(" ",".".join(str(int("0b"+x,2)) for x in s))
  print(" ",".".join(s))

def rand():
  m="mask(("
  k=[""]*4
  t=rd(0,30)
  for i in range(32):
    k[i//8]+=str(1*(i<=t))
  m+=",".join(str(int("0b"+x,2)) for x in k)+"),("
  for i in range(4):
    m+=str(rd(0,255))+","*(i<3)
  m+="))"
  print(m)

print("functions:")
print(" mask(): find local network's ip")
print("  args: mask, ip, as lists of dec_nums")
print(" rand(): generate random mask and ip")
print("example:")
print("mask((255,255,255,0),(192,168,1,1))")
print("rand()")