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ICMPDUMP.C
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C/C++ Source or Header
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1991-01-27
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2KB
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71 lines
/* ICMP header tracing
* Copyright 1991 Phil Karn, KA9Q
*/
#include <stdio.h>
#include "global.h"
#include "mbuf.h"
#include "internet.h"
#include "netuser.h"
#include "icmp.h"
#include "trace.h"
#include "ip.h"
/* Dump an ICMP header */
void
icmp_dump(fp,bpp,source,dest,check)
FILE *fp;
struct mbuf **bpp;
int32 source,dest;
int check; /* If 0, bypass checksum verify */
{
struct icmp icmp;
int16 csum;
if(bpp == NULLBUFP || *bpp == NULLBUF)
return;
csum = cksum(NULLHEADER,*bpp,len_p(*bpp));
ntohicmp(&icmp,bpp);
fprintf(fp,"ICMP: type %s",smsg(Icmptypes,ICMP_TYPES,uchar(icmp.type)));
switch(uchar(icmp.type)){
case ICMP_DEST_UNREACH:
fprintf(fp," code %s",smsg(Unreach,NUNREACH,uchar(icmp.code)));
break;
case ICMP_REDIRECT:
fprintf(fp," code %s",smsg(Redirect,NREDIRECT,uchar(icmp.code)));
fprintf(fp," new gateway %s",inet_ntoa(icmp.args.address));
break;
case ICMP_TIME_EXCEED:
fprintf(fp," code %s",smsg(Exceed,NEXCEED,uchar(icmp.code)));
break;
case ICMP_PARAM_PROB:
fprintf(fp," pointer %u",icmp.args.pointer);
break;
case ICMP_ECHO:
case ICMP_ECHO_REPLY:
case ICMP_INFO_RQST:
case ICMP_INFO_REPLY:
case ICMP_TIMESTAMP:
case ICMP_TIME_REPLY:
fprintf(fp," id %u seq %u",icmp.args.echo.id,icmp.args.echo.seq);
break;
}
if(check && csum != 0){
fprintf(fp," CHECKSUM ERROR (%u)",csum);
}
putc('\n',fp);
/* Dump the offending IP header, if any */
switch(icmp.type){
case ICMP_DEST_UNREACH:
case ICMP_TIME_EXCEED:
case ICMP_PARAM_PROB:
case ICMP_QUENCH:
case ICMP_REDIRECT:
fprintf(fp,"Returned ");
ip_dump(fp,bpp,0);
}
}