56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/*
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* netof - return the net address part of an ip address in a sockaddr_storage structure
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* (zero out host part)
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*/
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#include <config.h>
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#include <stdio.h>
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#include <syslog.h>
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#include "ntp_fp.h"
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#include "ntp_net.h"
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#include "ntp_stdlib.h"
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#include "ntp.h"
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sockaddr_u *
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netof(
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sockaddr_u *hostaddr
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)
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{
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static sockaddr_u netofbuf[8];
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static int next_netofbuf;
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u_int32 netnum;
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sockaddr_u * netaddr;
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netaddr = &netofbuf[next_netofbuf];
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next_netofbuf = (next_netofbuf + 1) % COUNTOF(netofbuf);
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memcpy(netaddr, hostaddr, sizeof(*netaddr));
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if (IS_IPV4(netaddr)) {
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netnum = SRCADR(netaddr);
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/*
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* We live in a modern CIDR world where the basement nets, which
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* used to be class A, are now probably associated with each
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* host address. So, for class-A nets, all bits are significant.
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*/
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if (IN_CLASSC(netnum))
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netnum &= IN_CLASSC_NET;
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else if (IN_CLASSB(netnum))
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netnum &= IN_CLASSB_NET;
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SET_ADDR4(netaddr, netnum);
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} else if (IS_IPV6(netaddr))
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/* assume the typical /64 subnet size */
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zero_mem(&NSRCADR6(netaddr)[8], 8);
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#ifdef DEBUG
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else {
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msyslog(LOG_ERR, "netof unknown AF %d", AF(netaddr));
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exit(1);
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}
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#endif
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return netaddr;
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}
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