?? udpdump.c
字號:
/* UDP packet tracing
*
*/
#include <stdio.h>
#include "global.h"
#include "mbuf.h"
#include "netuser.h"
#include "internet.h"
#include "udp.h"
#include "ip.h"
#include "socket.h"
#include "trace.h"
/* 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;
uint16 csum;
if(bpp == NULL || *bpp == NULL)
return;
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);
fprintf(fp," len %u",udp.length);
fprintf(fp," %u->%u",udp.source,udp.dest);
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);
putc('\n',fp);
switch(udp.dest){
case IPPORT_RIP:
rip_dump(fp,bpp);
}
}
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