sif_get.c

来自「TCP-IP红宝书源代码」· C语言 代码 · 共 139 行

/* sif_get.c - sif_get */

#include <conf.h>
#include <kernel.h>
#include <network.h>
#include <mem.h>
#include <q.h>

#ifdef	SNMP

#include <snmp.h>
#include <mib.h>
#include <asn1.h>

/*------------------------------------------------------------------------
 * sif_get - perform a get on a variable in the Interfaces Table
 *------------------------------------------------------------------------
 */
int
sif_get(struct snbentry *bindl, int numifaces)
{
	int 	iface, field, sl;
	

	if (sif_match(bindl, &iface, &field, numifaces) == SYSERR) {
		return SERR_NO_SUCH;
	}
	switch (field) {
	case 1:		/* ifIndex */
		SVTYPE(bindl) = ASN1_INT;
		SVINT(bindl) = iface;
		return SNMP_OK;
	case 2:		/* ifDescr */
		SVTYPE(bindl) = ASN1_OCTSTR;
		if (nif[iface].ni_descr) {
		    SVSTRLEN(bindl) = sl = strlen(nif[iface].ni_descr);
		    SVSTR(bindl) = (char *) getmem(sl);
		    memcpy(SVSTR(bindl), nif[iface].ni_descr, sl);
		} else {
		    char *descr = "<unknown>";
		    SVSTRLEN(bindl) = sl = strlen(descr);
		    SVSTR(bindl) = (char *) getmem(sl);
		    memcpy(SVSTR(bindl), descr, sl);
		}
		return SNMP_OK;
	case 3:		/* ifType */
		SVTYPE(bindl) = ASN1_INT;
		SVINT(bindl) = nif[iface].ni_mtype;
		return SNMP_OK;
	case 4:		/* ifMtu */
		SVTYPE(bindl) = ASN1_INT;
		SVINT(bindl) = nif[iface].ni_mtu;
		return SNMP_OK;
	case 5:		/* ifSpeed */
		SVTYPE(bindl) = ASN1_GAUGE;
		SVINT(bindl) = nif[iface].ni_speed;
		return SNMP_OK;
	case 6:		/* ifPhysAddress */
		SVTYPE(bindl) = ASN1_OCTSTR;
		SVSTR(bindl) = (char *) getmem(nif[iface].ni_hwa.ha_len);
		memcpy(SVSTR(bindl), nif[iface].ni_hwa.ha_addr,
			SVSTRLEN(bindl) = nif[iface].ni_hwa.ha_len);
		return SNMP_OK;
	case 7:		/* ifAdminStatus */
		SVTYPE(bindl) = ASN1_INT;
		SVINT(bindl) = nif[iface].ni_admstate;
		return SNMP_OK;
	case 8:		/* ifOperStatus */
		SVTYPE(bindl) = ASN1_INT;
		SVINT(bindl) = nif[iface].ni_state;
		return SNMP_OK;
	case 9:		/* ifLastChange */
		SVTYPE(bindl) = ASN1_TIMETICKS;
		SVINT(bindl) = nif[iface].ni_lastchange;
		return SNMP_OK;
	case 10:	/* ifInOctets */
		SVTYPE(bindl) = ASN1_COUNTER;
		SVINT(bindl) = nif[iface].ni_ioctets;
		return SNMP_OK;
	case 11:	/* ifInUcastPkts */
		SVTYPE(bindl) = ASN1_COUNTER;
		SVINT(bindl) = nif[iface].ni_iucast;
		return SNMP_OK;
	case 12:	/* ifInNUcastPkts */
		SVTYPE(bindl) = ASN1_COUNTER;
		SVINT(bindl) = nif[iface].ni_inucast;
		return SNMP_OK;
	case 13:	/* ifInDiscards */
		SVTYPE(bindl) = ASN1_COUNTER;
		SVINT(bindl) = nif[iface].ni_idiscard;
		return SNMP_OK;
	case 14:	/* ifInErrors */
		SVTYPE(bindl) = ASN1_COUNTER;
		SVINT(bindl) = nif[iface].ni_ierrors;
		return SNMP_OK;
	case 15:	/* ifInUnknownProtos */
		SVTYPE(bindl) = ASN1_COUNTER;
		SVINT(bindl) = nif[iface].ni_iunkproto;
		return SNMP_OK;
	case 16:	/* ifOutOctets */
		SVTYPE(bindl) = ASN1_COUNTER;
		SVINT(bindl) = nif[iface].ni_ooctets;
		return SNMP_OK;
	case 17:	/* ifOutUcastPkts */
		SVTYPE(bindl) = ASN1_COUNTER;
		SVINT(bindl) = nif[iface].ni_oucast;
		return SNMP_OK;
	case 18:	/* ifOutNUcastPkts */
		SVTYPE(bindl) = ASN1_COUNTER;
		SVINT(bindl) = nif[iface].ni_onucast;
		return SNMP_OK;
	case 19:	/* ifOutDiscards */
		SVTYPE(bindl) = ASN1_COUNTER;
		SVINT(bindl) = nif[iface].ni_odiscard;
		return SNMP_OK;
	case 20:	/* ifOutErrors */
		SVTYPE(bindl) = ASN1_COUNTER;
		SVINT(bindl) = nif[iface].ni_oerrors;
		return SNMP_OK;
	case 21:	/* ifOutQLen */
		SVTYPE(bindl) = ASN1_GAUGE;
		SVINT(bindl) = lenq(nif[iface].ni_outq);
		return SNMP_OK;
	case 22:	/* ifSpecific */
		{
			struct oid IfSpec = { {0,0}, 2};
			SVTYPE(bindl) = ASN1_OBJID;
			/* set to 0.0, per rfc 1213 */
			SVOIDLEN(bindl) = IfSpec.len;
			memcpy(SVOID(bindl), IfSpec.id, IfSpec.len * 2);
		}
		return SNMP_OK;
	default:
		break;
	}
	return SERR_NO_SUCH;
}
#endif	/* SNMP */