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Shareware Overload Trio 2
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jnos110g.zip
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UDPDUMP.C
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C/C++ Source or Header
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1994-04-17
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/* UDP packet tracing
* Copyright 1991 Phil Karn, KA9Q
*/
/* Mods by PA0GRI */
#include "global.h"
#include "mbuf.h"
#include "netuser.h"
#include "internet.h"
#include "udp.h"
#include "ip.h"
#include "socket.h"
#include "trace.h"
void rwho_dump __ARGS((FILE *fp,struct mbuf **bpp));
/* Dump a UDP header */
void
udp_dump(fp,bpp,source,dest,check)
FILE *fp;
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;
#ifdef MONITOR
if (!Trace_compact_header)
#endif
fprintf(fp,"UDP:");
/* Compute checksum */
ph.source = source;
ph.dest = dest;
ph.protocol = UDP_PTCL;
ph.length = len_p(*bpp);
if((csum = cksum(&ph,*bpp,ph.length)) == 0)
check = 0; /* No checksum error */
ntohudp(&udp,bpp);
#ifdef MONITOR
if (!Trace_compact_header)
#endif
fprintf(fp," len %u %u->%u",udp.length,udp.source,udp.dest);
#ifdef MONITOR
if (!Trace_compact_header)
#endif
if(udp.length > UDPHDR)
fprintf(fp," Data %u",udp.length - UDPHDR);
if(udp.checksum == 0)
check = 0;
if(check)
fprintf(fp," CHECKSUM ERROR (%u)",csum);
fprintf(fp,"\n");
switch(udp.dest){
#ifdef RIP
case IPPORT_RIP:
rip_dump(fp,bpp);
#endif
#ifdef notdef
case IPPORT_RWHO:
rwho_dump(fp,bpp);
#endif
}
}