b636d99d91
For now, printing of Sun RPC requests is disabled because we do not yet have the RPC header files. This should affect basically noone, as we do not have any RPC-based programs yet, for the same reason. Change-Id: Ie7818faaaacdc104d8b2c37a68866b4ce18247d6
254 lines
6.3 KiB
C
254 lines
6.3 KiB
C
/*
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* Copyright (c) 1989, 1990, 1991, 1993, 1994, 1995, 1996, 1997
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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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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: print-sl.c,v 1.5 2015/03/31 21:59:35 christos Exp $");
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#endif
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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include "interface.h"
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#include "extract.h" /* must come after interface.h */
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#include "ip.h"
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#include "tcp.h"
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#include "slcompress.h"
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/*
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* definitions of the pseudo- link-level header attached to slip
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* packets grabbed by the packet filter (bpf) traffic monitor.
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*/
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#define SLIP_HDRLEN 16
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#define SLX_DIR 0
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#define SLX_CHDR 1
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#define CHDR_LEN 15
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#define SLIPDIR_IN 0
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#define SLIPDIR_OUT 1
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static const char tstr[] = "[|slip]";
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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(netdissect_options *, const u_char *, const struct ip *, u_int);
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static void compressed_sl_print(netdissect_options *, const u_char *, const struct ip *, u_int, int);
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u_int
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sl_if_print(netdissect_options *ndo,
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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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if (caplen < SLIP_HDRLEN || length < SLIP_HDRLEN) {
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ND_PRINT((ndo, "%s", tstr));
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return (caplen);
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}
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length -= SLIP_HDRLEN;
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ip = (struct ip *)(p + SLIP_HDRLEN);
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if (ndo->ndo_eflag)
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sliplink_print(ndo, p, ip, length);
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switch (IP_V(ip)) {
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case 4:
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ip_print(ndo, (u_char *)ip, length);
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break;
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case 6:
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ip6_print(ndo, (u_char *)ip, length);
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break;
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default:
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ND_PRINT((ndo, "ip v%d", IP_V(ip)));
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}
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return (SLIP_HDRLEN);
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}
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u_int
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sl_bsdos_if_print(netdissect_options *ndo,
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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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if (caplen < SLIP_HDRLEN) {
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ND_PRINT((ndo, "%s", tstr));
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return (caplen);
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}
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length -= SLIP_HDRLEN;
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ip = (struct ip *)(p + SLIP_HDRLEN);
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#ifdef notdef
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if (ndo->ndo_eflag)
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sliplink_print(ndo, p, ip, length);
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#endif
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ip_print(ndo, (u_char *)ip, length);
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return (SLIP_HDRLEN);
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}
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static void
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sliplink_print(netdissect_options *ndo,
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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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ND_PRINT((ndo, dir == SLIPDIR_IN ? "I " : "O "));
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if (ndo->ndo_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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ND_PRINT((ndo, "%02x.", p[i]));
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ND_PRINT((ndo, "%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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ND_PRINT((ndo, "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 protocol 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_HL(ip);
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hlen += TH_OFF((struct tcphdr *)&((int *)ip)[hlen]);
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lastlen[dir][lastconn] = length - (hlen << 2);
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ND_PRINT((ndo, "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(ndo, &p[SLX_CHDR], ip,
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length, dir);
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ND_PRINT((ndo, ": "));
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} else
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ND_PRINT((ndo, "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(netdissect_options *ndo,
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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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ND_PRINT((ndo, " %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(netdissect_options *ndo,
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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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ND_PRINT((ndo, " W+%d", i));
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else
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ND_PRINT((ndo, " 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(netdissect_options *ndo,
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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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ND_PRINT((ndo, "ctcp %d", lastconn));
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} else
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ND_PRINT((ndo, "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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ND_PRINT((ndo, " *SA+%d", lastlen[dir][lastconn]));
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break;
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case SPECIAL_D:
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ND_PRINT((ndo, " *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(ndo, "U=", cp);
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if (flags & NEW_W)
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cp = print_sl_winchange(ndo, cp);
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if (flags & NEW_A)
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cp = print_sl_change(ndo, "A+", cp);
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if (flags & NEW_S)
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cp = print_sl_change(ndo, "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(ndo, "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_HL(ip);
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hlen += TH_OFF((struct tcphdr *)&((int32_t *)ip)[hlen]);
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lastlen[dir][lastconn] = length - (hlen << 2);
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ND_PRINT((ndo, " %d (%ld)", lastlen[dir][lastconn], (long)(cp - chdr)));
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}
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