pingd.c

嵌入式RMON,RMON为Remote monitor的缩写,基于SNMP为网络提供主动监控及错误告警,智能交换路由必备协议

/* Beholder RMON ethernet network monitor,Copyright (C) 1993 DNPAP group */
/* See file COPYING 'GNU General Public Licence' for copyright details   */
#include <chain.h>
#include <icmp.h>
#include "pingd.h"



static BOOLEAN Rcve(ICMP_DESCR *descr, CHAIN *chain, ICMP_HDR *icmpHdr, IP_HDR *ipHdr);


PINGD_STAT pingdStat;

ICMP_DESCR pingdIcmp =
{
    Rcve,
    ICMP_ECHO_REQUEST,
    ICMP_CODE_ANY,
    ICMP_ID_ANY,
    ICMP_SEQNR_ANY,
    ICMP_ADDR_ANY,
    ICMP_ADDR_ANY,
    0
};


BOOLEAN PingdInit(void)
{
    static BOOLEAN init = FALSE;
    
    if (!init)
    {
        init = IcmpRegister(&pingdIcmp);
    }

    return init;
}

PINGD_STAT *PingdStatistics(void)
{
    return &pingdStat;
}



static BOOLEAN Rcve(ICMP_DESCR *descr, CHAIN *chain, ICMP_HDR *icmpHdr, IP_HDR *ipHdr)
{
    DWORD   addr;
    BOOLEAN success = FALSE;
    
    icmpHdr->type = ICMP_ECHO_REPLY;
    addr          = ipHdr->src;
    ipHdr->src    = ipHdr->dst;
    ipHdr->dst    = addr;
    
    success = IcmpSend(chain, icmpHdr, ipHdr);
    
    if (success)
        pingdStat.datagrams++;
    else
        pingdStat.errors++;

    return success;
}