154359Sroberto/* 2132451Sroberto * netof - return the net address part of an ip address in a sockaddr_storage structure 354359Sroberto * (zero out host part) 454359Sroberto */ 5290001Sglebius#include <config.h> 654359Sroberto#include <stdio.h> 7290001Sglebius#include <syslog.h> 854359Sroberto 954359Sroberto#include "ntp_fp.h" 10290001Sglebius#include "ntp_net.h" 1154359Sroberto#include "ntp_stdlib.h" 12132451Sroberto#include "ntp.h" 1354359Sroberto 14290001Sglebiussockaddr_u * 1554359Srobertonetof( 16290001Sglebius sockaddr_u *hostaddr 1754359Sroberto ) 1854359Sroberto{ 19290001Sglebius static sockaddr_u netofbuf[8]; 20290001Sglebius static int next_netofbuf; 21290001Sglebius u_int32 netnum; 22290001Sglebius sockaddr_u * netaddr; 2354359Sroberto 24290001Sglebius netaddr = &netofbuf[next_netofbuf]; 25290001Sglebius next_netofbuf = (next_netofbuf + 1) % COUNTOF(netofbuf); 26132451Sroberto 27290001Sglebius memcpy(netaddr, hostaddr, sizeof(*netaddr)); 28132451Sroberto 29290001Sglebius if (IS_IPV4(netaddr)) { 30290001Sglebius netnum = SRCADR(netaddr); 31290001Sglebius 32132451Sroberto /* 33132451Sroberto * We live in a modern CIDR world where the basement nets, which 34132451Sroberto * used to be class A, are now probably associated with each 35132451Sroberto * host address. So, for class-A nets, all bits are significant. 36132451Sroberto */ 37290001Sglebius if (IN_CLASSC(netnum)) 38290001Sglebius netnum &= IN_CLASSC_NET; 39132451Sroberto else if (IN_CLASSB(netnum)) 40290001Sglebius netnum &= IN_CLASSB_NET; 41132451Sroberto 42290001Sglebius SET_ADDR4(netaddr, netnum); 43290001Sglebius 44290001Sglebius } else if (IS_IPV6(netaddr)) 45290001Sglebius /* assume the typical /64 subnet size */ 46290001Sglebius zero_mem(&NSRCADR6(netaddr)[8], 8); 47290001Sglebius#ifdef DEBUG 48290001Sglebius else { 49290001Sglebius msyslog(LOG_ERR, "netof unknown AF %d", AF(netaddr)); 50290001Sglebius exit(1); 51290001Sglebius } 52290001Sglebius#endif 53290001Sglebius 54290001Sglebius return netaddr; 5554359Sroberto} 56