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SOURCE.ARC
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TCPDUMP.C
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C/C++ Source or Header
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1990-01-26
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1KB
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65 lines
#include <stdio.h>
#include "global.h"
#include "mbuf.h"
#include "netuser.h"
#include "internet.h"
#include "timer.h"
#include "tcp.h"
#include "trace.h"
extern FILE *trfp;
/* TCP segment header flags */
char *tcpflags[] = {
"FIN", /* 0x01 */
"SYN", /* 0x02 */
"RST", /* 0x04 */
"PSH", /* 0x08 */
"ACK", /* 0x10 */
"URG" /* 0x20 */
};
/* Dump a TCP segment header. Assumed to be in network byte order */
void
tcp_dump(bpp,source,dest,check)
struct mbuf **bpp;
int32 source,dest; /* IP source and dest addresses */
int check; /* 0 if checksum test is to be bypassed */
{
int i;
struct tcp seg;
struct pseudo_header ph;
int16 csum;
if(bpp == NULLBUFP || *bpp == NULLBUF)
return;
/* Verify checksum */
ph.source = source;
ph.dest = dest;
ph.protocol = TCP_PTCL;
ph.length = len_mbuf(*bpp);
csum = cksum(&ph,*bpp,ph.length);
ntohtcp(&seg,bpp);
fprintf(trfp,"TCP: %u->%u Seq x%lx",seg.source,seg.dest,seg.seq,seg.ack);
if(seg.flags & ACK)
fprintf(trfp," Ack x%lx",seg.ack);
for(i=0;i<6;i++){
if(seg.flags & (1 << i)){
fprintf(trfp," %s",tcpflags[i]);
}
}
fprintf(trfp," Wnd %u",seg.wnd);
if(seg.flags & URG)
fprintf(trfp," UP x%x",seg.up);
/* Print options, if any */
if(seg.mss != 0)
fprintf(trfp," MSS %u",seg.mss);
if(check && csum != 0)
fprintf(trfp," CHECKSUM ERROR (%u)",csum);
fprintf(trfp,"\n");
}