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Annotation of embedaddon/ntp/libntp/netof.c, revision 1.1

1.1     ! misho       1: /* 
        !             2:  * netof - return the net address part of an ip address in a sockaddr_storage structure
        !             3:  *         (zero out host part)
        !             4:  */
        !             5: #include <stdio.h>
        !             6: #include <syslog.h>
        !             7: 
        !             8: #include "ntp_fp.h"
        !             9: #include "ntp_net.h"
        !            10: #include "ntp_stdlib.h"
        !            11: #include "ntp.h"
        !            12: 
        !            13: sockaddr_u *
        !            14: netof(
        !            15:        sockaddr_u *hostaddr
        !            16:        )
        !            17: {
        !            18:        static sockaddr_u       netofbuf[8];
        !            19:        static int              next_netofbuf;
        !            20:        u_int32                 netnum;
        !            21:        sockaddr_u *            netaddr;
        !            22: 
        !            23:        netaddr = &netofbuf[next_netofbuf];
        !            24:        next_netofbuf = (next_netofbuf + 1) % COUNTOF(netofbuf);
        !            25: 
        !            26:        memcpy(netaddr, hostaddr, sizeof(*netaddr));
        !            27: 
        !            28:        if (IS_IPV4(netaddr)) {
        !            29:                netnum = SRCADR(netaddr);
        !            30: 
        !            31:                /*
        !            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.
        !            35:                 */
        !            36:                if (IN_CLASSC(netnum))
        !            37:                        netnum &= IN_CLASSC_NET;
        !            38:                else if (IN_CLASSB(netnum))
        !            39:                        netnum &= IN_CLASSB_NET;
        !            40: 
        !            41:                SET_ADDR4(netaddr, netnum);
        !            42: 
        !            43:        } else if (IS_IPV6(netaddr))
        !            44:                /* assume the typical /64 subnet size */
        !            45:                memset(&NSRCADR6(netaddr)[8], 0, 8);
        !            46: #ifdef DEBUG
        !            47:        else {
        !            48:                msyslog(LOG_ERR, "netof unknown AF %d", AF(netaddr));
        !            49:                exit(1);
        !            50:        }
        !            51: #endif
        !            52: 
        !            53:        return netaddr;
        !            54: }