82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
#include "config.h"
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#ifdef TRACE
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#include <stdio.h>
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#include "global.h"
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#include "mbuf.h"
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#include "internet.h"
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#include "icmp.h"
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#include "trace.h"
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extern FILE *trfp;
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/* Dump an ICMP header */
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void
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icmp_dump(bpp,source,dest,check)
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struct mbuf **bpp;
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int32 source,dest;
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int check; /* If 0, bypass checksum verify */
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{
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struct icmp icmp;
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int16 csum,chksum();
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int ip_dump();
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void ntohicmp();
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if(bpp == NULLBUFP || *bpp == NULLBUF)
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return;
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csum = cksum(NULLHEADER,*bpp,len_mbuf(*bpp));
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ntohicmp(&icmp,bpp);
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if(uchar(icmp.type) <= 16 && icmptypes[uchar(icmp.type)] != NULLCHAR)
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fprintf(trfp,"ICMP: %s",icmptypes[uchar(icmp.type)]);
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else
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fprintf(trfp,"ICMP: type %u",uchar(icmp.type));
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switch(uchar(icmp.type)){
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case DEST_UNREACH:
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if(uchar(icmp.code) <= 5)
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fprintf(trfp," %s",unreach[uchar(icmp.code)]);
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else
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fprintf(trfp," code %u",uchar(icmp.code));
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break;
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case REDIRECT:
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if(uchar(icmp.code) <= 3)
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fprintf(trfp," %s",redirect[uchar(icmp.code)]);
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else
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fprintf(trfp," code %u",uchar(icmp.code));
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break;
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case TIME_EXCEED:
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if(uchar(icmp.code) <= 1)
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fprintf(trfp," %s",exceed[uchar(icmp.code)]);
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else
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fprintf(trfp," code %u",uchar(icmp.code));
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break;
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case PARAM_PROB:
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fprintf(trfp," pointer = %u",icmp.args.pointer);
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break;
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case ECHO_RQST:
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case ECHO_REPLY:
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case INFO_RQST:
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case INFO_REPLY:
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case TIMESTAMP:
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case TIME_REPLY:
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fprintf(trfp," id %u seq %u",icmp.args.echo.id,icmp.args.echo.seq);
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break;
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}
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if(check && csum != 0){
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fprintf(trfp," CHECKSUM ERROR (%u)",csum);
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}
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fprintf(trfp,"\n");
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/* Dump the offending IP header, if any */
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switch(icmp.type){
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case DEST_UNREACH:
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case TIME_EXCEED:
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case PARAM_PROB:
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case QUENCH:
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case REDIRECT:
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fprintf(trfp,"Returned ");
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ip_dump(bpp,0);
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}
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}
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#endif /* TRACE */
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