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unixcpio.gz
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unixnet.cpio
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udpdump.c
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C/C++ Source or Header
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1994-07-11
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838b
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46 lines
#include <stdio.h>
#include "global.h"
#include "mbuf.h"
#include "netuser.h"
#include "internet.h"
#include "udp.h"
extern FILE *trfp;
/* Dump a UDP header */
void
udp_dump(bpp,source,dest,check)
struct mbuf **bpp;
int32 source,dest;
int check; /* If 0, bypass checksum verify */
{
struct udp udp;
struct pseudo_header ph;
int16 csum;
if(bpp == NULLBUFP || *bpp == NULLBUF)
return;
fprintf(trfp,"UDP:");
/* Compute checksum */
ph.source = source;
ph.dest = dest;
ph.protocol = UDP_PTCL;
ph.length = len_mbuf(*bpp);
if((csum = cksum(&ph,*bpp,ph.length)) == 0)
check = 0; /* No checksum error */
ntohudp(&udp,bpp);
fprintf(trfp," %u->%u",udp.source,udp.dest);
fprintf(trfp," len %u",udp.length);
if(udp.checksum == 0)
check = 0;
if(check)
fprintf(trfp," CHECKSUM ERROR (%u)",csum);
fprintf(trfp,"\n");
}