route.py 文件源码

def route(self,dest,verbose=None):
        if type(dest) is list and dest:
            dest = dest[0]
        if dest in self.cache:
            return self.cache[dest]
        if verbose is None:
            verbose=conf.verb
        # Transform "192.168.*.1-5" to one IP of the set
        dst = dest.split("/")[0]
        dst = dst.replace("*","0") 
        while 1:
            l = dst.find("-")
            if l < 0:
                break
            m = (dst[l:]+".").find(".")
            dst = dst[:l]+dst[l+m:]


        dst = atol(dst)
        pathes=[]
        for d,m,gw,i,a in self.routes:
            aa = atol(a)
            if aa == dst:
                pathes.append((0xffffffffL,(LOOPBACK_NAME,a,"0.0.0.0")))
            if (dst & m) == (d & m):
                pathes.append((m,(i,a,gw)))
        if not pathes:
            #if verbose:
            #    warning("No route found (no default route?)")
            return LOOPBACK_NAME,"0.0.0.0","0.0.0.0" #XXX linux specific!
        # Choose the more specific route (greatest netmask).
        # XXX: we don't care about metrics
        pathes.sort()
        ret = pathes[-1][1]
        self.cache[dest] = ret
        return ret