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/* $OpenBSD: print-sl.c,v 1.19 2015/11/16 00:16:39 mmcc Exp $ */
/*
* Copyright (c) 1989, 1990, 1991, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifdef HAVE_NET_SLIP_H
#include <sys/time.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
struct rtentry;
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <net/slcompress.h>
#include <net/slip.h>
#include <ctype.h>
#include <netdb.h>
#include <pcap.h>
#include <stdio.h>
#include <limits.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h" /* must come after interface.h */
static u_int lastlen[2][256];
static u_int lastconn = 255;
static void sliplink_print(const u_char *, const struct ip *, u_int);
static void compressed_sl_print(const u_char *, const struct ip *, u_int, int);
/* XXX BSD/OS 2.1 compatibility */
#if !defined(SLIP_HDRLEN) && defined(SLC_BPFHDR)
#define SLIP_HDRLEN SLC_BPFHDR
#define SLX_DIR 0
#define SLX_CHDR (SLC_BPFHDRLEN - 1)
#define CHDR_LEN (SLC_BPFHDR - SLC_BPFHDRLEN)
#endif
/* XXX needs more hacking to work right */
void
sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
const struct ip *ip;
ts_print(&h->ts);
if (caplen < SLIP_HDRLEN || length < SLIP_HDRLEN) {
printf("[|slip]");
goto out;
}
/*
* Some printers want to get back at the link level addresses,
* and/or check that they're not walking off the end of the packet.
* Rather than pass them all the way down, we set these globals.
*/
packetp = p;
snapend = p + caplen;
length -= SLIP_HDRLEN;
ip = (struct ip *)(p + SLIP_HDRLEN);
if (eflag)
sliplink_print(p, ip, length);
switch (ip->ip_v) {
case 4:
ip_print((u_char *)ip, length);
break;
#ifdef INET6
case 6:
ip6_print((u_char *)ip, length);
break;
#endif
default:
printf ("ip v%d", ip->ip_v);
}
if (xflag)
default_print((u_char *)ip, caplen - SLIP_HDRLEN);
out:
putchar('\n');
}
void
sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
const struct ip *ip;
ts_print(&h->ts);
if (caplen < SLIP_HDRLEN) {
printf("[|slip]");
goto out;
}
/*
* Some printers want to get back at the link level addresses,
* and/or check that they're not walking off the end of the packet.
* Rather than pass them all the way down, we set these globals.
*/
packetp = p;
snapend = p + caplen;
length -= SLIP_HDRLEN;
ip = (struct ip *)(p + SLIP_HDRLEN);
#ifdef notdef
if (eflag)
sliplink_print(p, ip, length);
#endif
ip_print((u_char *)ip, length);
if (xflag)
default_print((u_char *)ip, caplen - SLIP_HDRLEN);
out:
putchar('\n');
}
static void
sliplink_print(const u_char *p, const struct ip *ip, u_int length)
{
int dir;
u_int hlen;
dir = p[SLX_DIR];
putchar(dir == SLIPDIR_IN ? 'I' : 'O');
putchar(' ');
if (nflag) {
/* XXX just dump the header */
int i;
for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
printf("%02x.", p[i]);
printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]);
return;
}
switch (p[SLX_CHDR] & 0xf0) {
case TYPE_IP:
printf("ip %d: ", length + SLIP_HDRLEN);
break;
case TYPE_UNCOMPRESSED_TCP:
/*
* The connection id is stored in the IP protocol field.
* Get it from the link layer since sl_uncompress_tcp()
* has restored the IP header copy to IPPROTO_TCP.
*/
lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
hlen = ip->ip_hl;
hlen += ((struct tcphdr *)&((int *)ip)[hlen])->th_off;
lastlen[dir][lastconn] = length - (hlen << 2);
printf("utcp %d: ", lastconn);
break;
default:
if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
compressed_sl_print(&p[SLX_CHDR], ip,
length, dir);
printf(": ");
} else
printf("slip-%d!: ", p[SLX_CHDR]);
}
}
static const u_char *
print_sl_change(const char *str, const u_char *cp)
{
u_int i;
if ((i = *cp++) == 0) {
i = EXTRACT_16BITS(cp);
cp += 2;
}
printf(" %s%d", str, i);
return (cp);
}
static const u_char *
print_sl_winchange(const u_char *cp)
{
short i;
if ((i = *cp++) == 0) {
i = EXTRACT_16BITS(cp);
cp += 2;
}
if (i >= 0)
printf(" W+%d", i);
else
printf(" W%d", i);
return (cp);
}
static void
compressed_sl_print(const u_char *chdr, const struct ip *ip,
u_int length, int dir)
{
const u_char *cp = chdr;
u_int flags, hlen;
flags = *cp++;
if (flags & NEW_C) {
lastconn = *cp++;
printf("ctcp %d", lastconn);
} else
printf("ctcp *");
/* skip tcp checksum */
cp += 2;
switch (flags & SPECIALS_MASK) {
case SPECIAL_I:
printf(" *SA+%d", lastlen[dir][lastconn]);
break;
case SPECIAL_D:
printf(" *S+%d", lastlen[dir][lastconn]);
break;
default:
if (flags & NEW_U)
cp = print_sl_change("U=", cp);
if (flags & NEW_W)
cp = print_sl_winchange(cp);
if (flags & NEW_A)
cp = print_sl_change("A+", cp);
if (flags & NEW_S)
cp = print_sl_change("S+", cp);
break;
}
if (flags & NEW_I)
cp = print_sl_change("I+", cp);
/*
* 'hlen' is the length of the uncompressed TCP/IP header (in words).
* 'cp - chdr' is the length of the compressed header.
* 'length - hlen' is the amount of data in the packet.
*/
hlen = ip->ip_hl;
hlen += ((struct tcphdr *)&((int32_t *)ip)[hlen])->th_off;
lastlen[dir][lastconn] = length - (hlen << 2);
printf(" %d (%d)", lastlen[dir][lastconn], (int)(cp - chdr));
}
#else
#include <sys/types.h>
#include <sys/time.h>
#include <pcap.h>
#include <stdio.h>
#include "interface.h"
void
sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
{
error("not configured for slip");
/* NOTREACHED */
}
void
sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
{
error("not configured for slip");
/* NOTREACHED */
}
#endif
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