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HAM Radio 3
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hamradioversion3.0examsandprograms1992.iso
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n17jsrc
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slhcdump.c
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C/C++ Source or Header
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1991-03-07
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3KB
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121 lines
#include <stdio.h>
#include "global.h"
#include "mbuf.h"
#include "internet.h"
#include "ip.h"
#include "slhc.h"
#include "trace.h"
static int16 decodeint __ARGS((struct mbuf **bpp));
/* dump serial line IP packet; may have Van Jacobson TCP header compression */
void
sl_dump(fp,bpp,unused)
FILE *fp;
struct mbuf **bpp;
int unused;
{
struct mbuf *bp, *tbp;
unsigned char c;
int len;
bp = *bpp;
c = bp->data[0];
if ((c & 0xf0) == (IPVERSION << 4)) {
fprintf(fp,"serial line IP: len: %3u\n",len_p(*bpp));
ip_dump(fp,bpp,1);
} else if (c & 0x80) {
fprintf(fp,"serial line VJ Compressed TCP: len %3u\n",len_p(*bpp));
vjcomp_dump(fp,bpp,0);
} else {
len = len_p(bp);
fprintf(fp,"serial line VJ Uncompressed TCP: len %3u connection ID: %3u\n",
len, uchar(bp->data[9])); /* FIX THIS! */
/* Get our own copy so we can mess with the data */
tbp = copy_p(bp, len);
free_p(bp);
*bpp = NULLBUF;
/* Restore the bytes used with Uncompressed TCP */
tbp->data[0] &= 0x4f; /* FIX THIS! */
tbp->data[9] = TCP_PTCL; /* FIX THIS! */
/* Dump contents as a regular IP packet */
ip_dump(fp,&tbp,1);
}
}
/****************************************************************************/
static int16
decodeint(bpp)
struct mbuf **bpp;
{
char tmpbuf[2];
pullup(bpp,tmpbuf,1);
if (tmpbuf[0] == 0)
pullup(bpp,tmpbuf,2);
else {
tmpbuf[1] = tmpbuf[0];
tmpbuf[0] = 0;
}
return(get16(tmpbuf));
}
void
vjcomp_dump(fp,bpp,unused)
FILE *fp;
struct mbuf **bpp;
int unused;
{
char changes;
char tmpbuf[2];
if(bpp == NULLBUFP || *bpp == NULLBUF)
return;
/* Dump compressed TCP/IP header */
fprintf(fp,"VJ Compr TCP/IP: ");
pullup(bpp,&changes,1);
fprintf(fp,"changes: 0x%02x ",uchar(changes));
if (changes & NEW_C) {
pullup(bpp,tmpbuf,1);
fprintf(fp,"connection: 0x%02x ",uchar(tmpbuf[0]));
}
pullup(bpp,tmpbuf,2);
fprintf(fp,"TCP checksum: 0x%04x ",get16(tmpbuf));
if (changes & TCP_PUSH_BIT)
fprintf(fp,"PUSH\n");
else
fprintf(fp,"\n");
switch (changes & SPECIALS_MASK) {
case SPECIAL_I:
fprintf(fp,"\t\t delta ACK and delta SEQ implied by length of data\n");
break;
case SPECIAL_D:
fprintf(fp,"\t\t delta SEQ implied by length of data\n");
break;
default:
fprintf(fp,"\t\t ");
if (changes & NEW_U) {
fprintf(fp,"Urgent pointer: 0x%02x ",decodeint(bpp));
}
if (changes & NEW_W)
fprintf(fp,"delta WINDOW: 0x%02x ",decodeint(bpp));
if (changes & NEW_A)
fprintf(fp,"delta ACK: 0x%02x ",decodeint(bpp));
if (changes & NEW_S)
fprintf(fp,"delta SEQ: 0x%02x ",decodeint(bpp));
break;
}
if (changes & NEW_I) {
fprintf(fp,"delta ID: %02x ",decodeint(bpp));
} else
fprintf(fp,"increment ID ");
fprintf(fp,"\n");
}