2 * netof - return the net address part of an ip address in a sockaddr_storage structure
8 #include "ntp_stdlib.h"
11 #define NUM_NETOF_BUFS 10
12 static struct sockaddr_storage ssbuf[NUM_NETOF_BUFS];
13 static int next_ssbuf = 0;
15 struct sockaddr_storage*
17 struct sockaddr_storage* hostaddr
20 register u_int32 netnum;
21 struct sockaddr_storage *netaddr;
23 netaddr = &ssbuf[next_ssbuf++];
24 if (next_ssbuf == NUM_NETOF_BUFS)
26 memcpy(netaddr, hostaddr, sizeof(struct sockaddr_storage));
28 if(netaddr->ss_family == AF_INET) {
29 netnum = ((struct sockaddr_in*)netaddr)->sin_addr.s_addr;
32 * We live in a modern CIDR world where the basement nets, which
33 * used to be class A, are now probably associated with each
34 * host address. So, for class-A nets, all bits are significant.
37 netnum &= IN_CLASSC_NET;
38 else if (IN_CLASSB(netnum))
39 netnum &= IN_CLASSB_NET;
40 ((struct sockaddr_in*)netaddr)->sin_addr.s_addr = netnum;
42 else if(netaddr->ss_family == AF_INET6) {
43 /* Here we put 0 at the local link address so we get net address */
44 memset(&((struct sockaddr_in6*)netaddr)->sin6_addr.s6_addr[8], 0, 8*sizeof(u_char));