257 lines
6.1 KiB
C
257 lines
6.1 KiB
C
/*
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* Copyright (c) 1989, 1990, 1991, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static char rcsid[] =
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"@(#)$Header: print-sl.c,v 1.38 96/07/15 18:23:25 leres Exp $ (LBL)";
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#endif
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#ifdef HAVE_NET_SLIP_H
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/timeb.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#if __STDC__
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struct rtentry;
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#endif
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/if_ether.h>
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#include <netinet/ip_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcpip.h>
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#include <net/slcompress.h>
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#include <net/slip.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <pcap.h>
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#include <signal.h>
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#include <stdio.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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static u_int lastlen[2][256];
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static u_int lastconn = 255;
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static void sliplink_print(const u_char *, const struct ip *, u_int);
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static void compressed_sl_print(const u_char *, const struct ip *, u_int, int);
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/* XXX BSD/OS 2.1 compatibility */
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#if !defined(SLIP_HDRLEN) && defined(SLC_BPFHDR)
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#define SLIP_HDRLEN SLC_BPFHDR
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#define SLX_DIR 0
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#define SLX_CHDR (SLC_BPFHDRLEN - 1)
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#define CHDR_LEN (SLC_BPFHDR - SLC_BPFHDRLEN)
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#endif
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void
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sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
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{
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register u_int caplen = h->caplen;
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register u_int length = h->len;
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register const struct ip *ip;
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ts_print(&h->ts);
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if (caplen < SLIP_HDRLEN) {
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printf("[|slip]");
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goto out;
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}
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/*
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* Some printers want to get back at the link level addresses,
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* and/or check that they're not walking off the end of the packet.
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* Rather than pass them all the way down, we set these globals.
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*/
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packetp = p;
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snapend = p + caplen;
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length -= SLIP_HDRLEN;
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ip = (struct ip *)(p + SLIP_HDRLEN);
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if (eflag)
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sliplink_print(p, ip, length);
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ip_print((u_char *)ip, length);
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if (xflag)
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default_print((u_char *)ip, caplen - SLIP_HDRLEN);
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out:
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putchar('\n');
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}
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static void
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sliplink_print(register const u_char *p, register const struct ip *ip,
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register u_int length)
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{
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int dir;
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u_int hlen;
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dir = p[SLX_DIR];
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putchar(dir == SLIPDIR_IN ? 'I' : 'O');
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putchar(' ');
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if (nflag) {
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/* XXX just dump the header */
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register int i;
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for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
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printf("%02x.", p[i]);
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printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]);
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return;
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}
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switch (p[SLX_CHDR] & 0xf0) {
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case TYPE_IP:
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printf("ip %d: ", length + SLIP_HDRLEN);
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break;
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case TYPE_UNCOMPRESSED_TCP:
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/*
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* The connection id is stored in the IP protcol field.
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* Get it from the link layer since sl_uncompress_tcp()
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* has restored the IP header copy to IPPROTO_TCP.
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*/
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lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
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hlen = ip->ip_hl;
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hlen += ((struct tcphdr *)&((int *)ip)[hlen])->th_off;
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lastlen[dir][lastconn] = length - (hlen << 2);
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printf("utcp %d: ", lastconn);
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break;
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default:
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if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
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compressed_sl_print(&p[SLX_CHDR], ip,
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length, dir);
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printf(": ");
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} else
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printf("slip-%d!: ", p[SLX_CHDR]);
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}
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}
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static const u_char *
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print_sl_change(const char *str, register const u_char *cp)
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{
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register u_int i;
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if ((i = *cp++) == 0) {
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i = EXTRACT_16BITS(cp);
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cp += 2;
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}
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printf(" %s%d", str, i);
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return (cp);
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}
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static const u_char *
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print_sl_winchange(register const u_char *cp)
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{
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register short i;
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if ((i = *cp++) == 0) {
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i = EXTRACT_16BITS(cp);
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cp += 2;
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}
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if (i >= 0)
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printf(" W+%d", i);
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else
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printf(" W%d", i);
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return (cp);
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}
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static void
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compressed_sl_print(const u_char *chdr, const struct ip *ip,
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u_int length, int dir)
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{
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register const u_char *cp = chdr;
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register u_int flags, hlen;
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flags = *cp++;
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if (flags & NEW_C) {
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lastconn = *cp++;
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printf("ctcp %d", lastconn);
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} else
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printf("ctcp *");
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/* skip tcp checksum */
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cp += 2;
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switch (flags & SPECIALS_MASK) {
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case SPECIAL_I:
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printf(" *SA+%d", lastlen[dir][lastconn]);
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break;
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case SPECIAL_D:
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printf(" *S+%d", lastlen[dir][lastconn]);
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break;
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default:
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if (flags & NEW_U)
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cp = print_sl_change("U=", cp);
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if (flags & NEW_W)
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cp = print_sl_winchange(cp);
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if (flags & NEW_A)
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cp = print_sl_change("A+", cp);
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if (flags & NEW_S)
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cp = print_sl_change("S+", cp);
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break;
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}
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if (flags & NEW_I)
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cp = print_sl_change("I+", cp);
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/*
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* 'hlen' is the length of the uncompressed TCP/IP header (in words).
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* 'cp - chdr' is the length of the compressed header.
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* 'length - hlen' is the amount of data in the packet.
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*/
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hlen = ip->ip_hl;
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hlen += ((struct tcphdr *)&((int32_t *)ip)[hlen])->th_off;
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lastlen[dir][lastconn] = length - (hlen << 2);
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printf(" %d (%d)", lastlen[dir][lastconn], cp - chdr);
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}
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#else
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#include <sys/types.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include "interface.h"
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void
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sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
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{
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error("not configured for slip");
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/* NOTREACHED */
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}
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#endif
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