inet.c

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            if (sp->entry == 0)
                break;
        }
        if (sp->entry > stat)
            continue;

        /* Skip exceptions or missing values */
        if ( !vp->val.integer )
            continue;
        /*
         * If '-Cs' was specified twice,
         *   then only display non-zero stats.
         */
        if ( *vp->val.integer > 0 || sflag == 1 ) {
            putchar('\t');
            printf(sp->description, *vp->val.integer,
                             plural(*vp->val.integer));
            putchar('\n');
        }
    }
    snmp_free_varbind( var );
}


/*
 * Dump IP statistics.
 */
void
ip_stats(const char *name)
{
    oid               ipstats_oid[] = { 1, 3, 6, 1, 2, 1, 4, 0, 0 };
    size_t            ipstats_len   = OID_LENGTH( ipstats_oid );
    struct stat_table ipstats_tbl[] = {
        {3, "%d total datagram%s received"},
        {4, "%d datagram%s with header errors"},
        {5, "%d datagram%s with an invalid destination address"},
        {6, "%d datagram%s forwarded"},
        {7, "%d datagram%s with unknown protocol"},
        {8, "%d datagram%s discarded"},
        {9, "%d datagram%s delivered"},
        {10, "%d output datagram request%s"},
        {11, "%d output datagram%s discarded"},
        {12, "%d datagram%s with no route"},
        {14, "%d fragment%s received"},
        {15, "%d datagram%s reassembled"},
        {16, "%d reassembly failure%s"},
        {17, "%d datagram%s fragmented"},
        {18, "%d fragmentation failure%s"},
        {19, "%d fragment%s created"},
        {23, "%d route%s discarded"},
        {0, ""}
    };

    _dump_stats( name, ipstats_oid, ipstats_len, ipstats_tbl );
}


/*
 * Dump ICMP statistics.
 */
void
icmp_stats(const char *name)
{
    oid               icmpstats_oid[] = { 1, 3, 6, 1, 2, 1, 5, 0, 0 };
    size_t            icmpstats_len   = OID_LENGTH( icmpstats_oid );
    struct stat_table icmpstats_tbl[] = {
        {1, "%d total message%s received"},
        {2, "%d message%s dropped due to errors"},
        {14, "%d ouput message request%s"},
        {15, "%d output message%s discarded"},
        {0, ""}
    };
    struct stat_table icmp_inhistogram[] = {
        {3, "Destination unreachable: %d"},
        {4, "Time Exceeded: %d"},
        {5, "Parameter Problem: %d"},
        {6, "Source Quench: %d"},
        {7, "Redirect: %d"},
        {8, "Echo Request: %d"},
        {9, "Echo Reply: %d"},
        {10, "Timestamp Request: %d"},
        {11, "Timestamp Reply: %d"},
        {12, "Address Mask Request: %d"},
        {13, "Address Mask Reply: %d"},
        {0, ""}
    };
    struct stat_table icmp_outhistogram[] = {
        {16, "Destination unreachable: %d"},
        {17, "Time Exceeded: %d"},
        {18, "Parameter Problem: %d"},
        {19, "Source Quench: %d"},
        {20, "Redirect: %d"},
        {21, "Echo Request: %d"},
        {22, "Echo Reply: %d"},
        {23, "Timestamp Request: %d"},
        {24, "Timestamp Reply: %d"},
        {25, "Address Mask Request: %d"},
        {26, "Address Mask Reply: %d"},
        {0, ""}
    };

    _dump_stats( name, icmpstats_oid, icmpstats_len, icmpstats_tbl );
    _dump_stats( "    Input Histogram",
                       icmpstats_oid, icmpstats_len, icmp_inhistogram );
    _dump_stats( "    Output Histogram",
                       icmpstats_oid, icmpstats_len, icmp_outhistogram );
}


/*
 * Dump TCP statistics.
 */
void
tcp_stats(const char *name)
{
    oid               tcpstats_oid[] = { 1, 3, 6, 1, 2, 1, 6, 0, 0 };
    size_t            tcpstats_len   = OID_LENGTH( tcpstats_oid );
    struct stat_table tcpstats_tbl[] = {
        {5, "%d active open%s"},
        {6, "%d passive open%s"},
        {7, "%d failed attempt%s"},
        {8, "%d reset%s of established connections"},
        {9, "%d current established connection%s"},
        {10, "%d segment%s received"},
        {11, "%d segment%s sent"},
        {12, "%d segment%s retransmitted"},
        {14, "%d invalid segment%s received"},
        {15, "%d reset%s sent"},
        {0, ""}
    };
    _dump_stats( name, tcpstats_oid, tcpstats_len, tcpstats_tbl );
}


/*
 * Dump UDP statistics.
 */
void
udp_stats(const char *name)
{
    oid               udpstats_oid[] = { 1, 3, 6, 1, 2, 1, 7, 0, 0 };
    size_t            udpstats_len   = OID_LENGTH( udpstats_oid );
    struct stat_table udpstats_tbl[] = {
        {1, "%d total datagram%s received"},
        {2, "%d datagram%s to invalid port"},
        {3, "%d datagram%s dropped due to errors"},
        {4, "%d output datagram request%s"},
        {0, ""}
    };
    _dump_stats( name, udpstats_oid, udpstats_len, udpstats_tbl );
}


/*
 * Omitted:
 *     Dump IGMP     statistics
 *     Dump PIM      statistics
 *     Dump AH       statistics
 *     Dump etherip  statistics
 *     Dump ESP      statistics
 *     Dump IP-in-IP statistics
 *     Dump CARP     statistics
 *     Dump pfsync   statistics
 *     Dump IPCOMP   statistics
 */

	/*
	 * Utility routines
	 */

/*
 * Translation of RPC service names - Omitted
 */

/*
 * Pretty print an Internet address (net address + port).
 * If the nflag was specified, use numbers instead of names.
 */
void
inetprint(struct in_addr *in, int port, const char *proto, int local)
{
	struct servent *sp = 0;
	char line[80], *cp;
	int width;

	snprintf(line, sizeof line, "%.*s.", (Aflag && !nflag) ? 12 : 16,
	    inetname(in));
	cp = strchr(line, '\0');
	if (!nflag && port)
		sp = getservbyport((int)port, proto);
	if (sp || port == 0)
		snprintf(cp, line + sizeof line - cp, "%.8s",
		    sp ? sp->s_name : "*");
     /*
      * Translation of RPC service names - Omitted
      */
	else
		snprintf(cp, line + sizeof line - cp, "%d", ntohs(port));
	width = Aflag ? 18 : 22;
	printf(" %-*.*s", width, width, line);
}

/*
 * Construct an Internet address representation.
 * If the nflag has been supplied, give
 * numeric value, otherwise try for symbolic name.
 */
char *
inetname(struct in_addr *inp)
{
	char *cp;
	static char line[50];
	struct hostent *hp;
	struct netent *np;
	static char domain[MAXHOSTNAMELEN];
	static int first = 1;
#if defined (WIN32) || defined (cygwin)
        char host_temp[] = "localhost";
#endif

	if (first && !nflag) {
		first = 0;
		if (gethostname(domain, sizeof(domain)) == 0 &&
		    (cp = strchr(domain, '.')))
			(void) strlcpy(domain, cp + 1, sizeof domain);
		else
			domain[0] = '\0';
	}
	cp = NULL;
	if (!nflag && inp->s_addr != INADDR_ANY) {
		int net = inet_netof(*inp);
		int lna = inet_lnaof(*inp);

		if (lna == INADDR_ANY) {
			np = getnetbyaddr(net, AF_INET);
			if (np)
				cp = np->n_name;
		}
		if (cp == NULL) {
			hp = gethostbyaddr((char *)inp, sizeof (*inp), AF_INET);
			if (hp) {
				if ((cp = strchr(hp->h_name, '.')) &&
				    !strcmp(cp + 1, domain))
					*cp = '\0';
#if defined (WIN32) || defined (cygwin)
                                        /* Windows insists on returning the computer name for 127.0.0.1
                                         * even if the hosts file lists something else such as 'localhost'.
                                         * If we are trying to look up 127.0.0.1, just return 'localhost'   */
                                        if (!strcmp(inet_ntoa(*inp),"127.0.0.1"))
                                             cp = host_temp;
                                        else
#endif                                                                          
				cp = hp->h_name;
			}
		}
	}
	if (inp->s_addr == INADDR_ANY)
		snprintf(line, sizeof line, "*");
	else if (cp)
		snprintf(line, sizeof line, "%s", cp);
	else {
		inp->s_addr = ntohl(inp->s_addr);
#define C(x)	((x) & 0xff)
		snprintf(line, sizeof line, "%u.%u.%u.%u",
		    C(inp->s_addr >> 24), C(inp->s_addr >> 16),
		    C(inp->s_addr >> 8), C(inp->s_addr));
	}
	return (line);
}