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/*
* netof - return the net address part of an ip address in a sockaddr_u structure
* (zero out host part)
*/
#include <config.h>
#include <stdio.h>
#include <syslog.h>
#include "ntp_fp.h"
#include "ntp_net.h"
#include "ntp_stdlib.h"
#include "ntp.h"
/*
* Return the network portion of a host address. Used by ntp_io.c
* findbcastinter() to find a multicast/broadcast interface for
* a given remote address. Note static storage is used, with room
* for only two addresses, which is all that is needed at present.
*
*/
sockaddr_u *
netof(
sockaddr_u *hostaddr
)
{
static sockaddr_u netofbuf[2];
static int next_netofbuf;
u_int32 netnum;
sockaddr_u * netaddr;
netaddr = &netofbuf[next_netofbuf];
next_netofbuf = (next_netofbuf + 1) % COUNTOF(netofbuf);
memcpy(netaddr, hostaddr, sizeof(*netaddr));
if (IS_IPV4(netaddr)) {
/*
* We live in a modern classless IPv4 world. Assume /24.
*/
netnum = SRCADR(netaddr) & IN_CLASSC_NET;
SET_ADDR4(netaddr, netnum);
} else if (IS_IPV6(netaddr))
/* assume the typical /64 subnet size */
zero_mem(&NSRCADR6(netaddr)[8], 8);
#ifdef DEBUG
else {
msyslog(LOG_ERR, "netof unknown AF %d", AF(netaddr));
exit(1);
}
#endif
return netaddr;
}
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