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icmpdump.c
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C/C++ Source or Header
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1994-07-11
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2KB
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79 lines
#include <stdio.h>
#include "global.h"
#include "mbuf.h"
#include "internet.h"
#include "icmp.h"
#include "trace.h"
extern FILE *trfp;
/* Dump an ICMP header */
/*ARGSUSED*/
void
icmp_dump(bpp,source,dest,check)
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_mbuf(*bpp));
ntohicmp(&icmp,bpp);
if(uchar(icmp.type) <= 16 && icmptypes[uchar(icmp.type)] != NULLCHAR)
fprintf(trfp,"ICMP: %s",icmptypes[uchar(icmp.type)]);
else
fprintf(trfp,"ICMP: type %u",uchar(icmp.type));
switch(uchar(icmp.type)){
case DEST_UNREACH:
if(uchar(icmp.code) <= 5)
fprintf(trfp," %s",unreach[uchar(icmp.code)]);
else
fprintf(trfp," code %u",uchar(icmp.code));
break;
case REDIRECT:
if(uchar(icmp.code) <= 3)
fprintf(trfp," %s",redirect[uchar(icmp.code)]);
else
fprintf(trfp," code %u",uchar(icmp.code));
break;
case TIME_EXCEED:
if(uchar(icmp.code) <= 1)
fprintf(trfp," %s",exceed[uchar(icmp.code)]);
else
fprintf(trfp," code %u",uchar(icmp.code));
break;
case PARAM_PROB:
fprintf(trfp," pointer = %u",icmp.args.pointer);
break;
case ECHO:
case ECHO_REPLY:
case INFO_RQST:
case INFO_REPLY:
case TIMESTAMP:
case TIME_REPLY:
fprintf(trfp," id %u seq %u",icmp.args.echo.id,icmp.args.echo.seq);
break;
}
if(check && csum != 0){
fprintf(trfp," CHECKSUM ERROR (%u)",csum);
}
fprintf(trfp,"\n");
/* Dump the offending IP header, if any */
switch(icmp.type){
case DEST_UNREACH:
case TIME_EXCEED:
case PARAM_PROB:
case QUENCH:
case REDIRECT:
fprintf(trfp,"Returned ");
ip_dump(bpp,0);
}
}