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- /*
- * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1995
- * 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.
- */
-
- #ifndef lint
- static char rcsid[] =
- "@(#)$Header: print-sl.c,v 1.28+ 94/06/10 17:01:38 mccanne Exp $ (LBL)";
- #endif
-
- #ifdef CSLIP
- #include <sys/param.h>
- #include <sys/time.h>
- #include <sys/timeb.h>
- #include <sys/file.h>
- #include <sys/ioctl.h>
- #include <sys/mbuf.h>
- #include <sys/socket.h>
-
- #include <net/if.h>
- #include <netinet/in.h>
- #include <netinet/in_systm.h>
- #include <netinet/ip.h>
- #include <netinet/if_ether.h>
- #include <netinet/ip_var.h>
- #include <netinet/udp.h>
- #include <netinet/udp_var.h>
- #include <netinet/tcp.h>
- #include <netinet/tcpip.h>
-
- #include <net/slcompress.h>
- #include <net/slip.h>
-
- #include <ctype.h>
- #include <netdb.h>
- #include <pcap.h>
- #include <signal.h>
- #include <stdio.h>
-
- #include "interface.h"
- #include "addrtoname.h"
-
- static int lastlen[2][256];
- static int lastconn = 255;
-
- static void sliplink_print(const u_char *, const struct ip *, int);
- static void compressed_sl_print(const u_char *, const struct ip *, int, int);
-
- void
- sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
- {
- register int caplen = h->caplen;
- register int length = h->len;
- register 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);
-
- if (eflag)
- sliplink_print(p, ip, length);
-
- ip_print((u_char *)ip, length);
-
- if (xflag)
- default_print((u_char *)ip, caplen - SLIP_HDRLEN);
- out:
- putchar('\n');
- }
-
- static void
- sliplink_print(register const u_char *p, register const struct ip *ip,
- register int length)
- {
- int dir;
- int hlen;
-
- dir = p[SLX_DIR];
- putchar(dir == SLIPDIR_IN ? 'I' : 'O');
- putchar(' ');
-
- if (nflag) {
- /* XXX just dump the header */
- int i;
-
- for (i = 0; i < 15; ++i)
- printf("%02x.", p[SLX_CHDR + i]);
- printf("%02x: ", p[SLX_CHDR + 15]);
- 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 protcol 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, register const u_char *cp)
- {
- register u_int i;
-
- if ((i = *cp++) == 0) {
- i = (cp[0] << 8) | cp[1];
- cp += 2;
- }
- printf(" %s%d", str, i);
- return (cp);
- }
-
- static const u_char *
- print_sl_winchange(register const u_char *cp)
- {
- register short i;
-
- if ((i = *cp++) == 0) {
- i = (cp[0] << 8) | cp[1];
- 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,
- int length, int dir)
- {
- register const u_char *cp = chdr;
- register u_int flags;
- int 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 *)ip)[hlen])->th_off;
- lastlen[dir][lastconn] = length - (hlen << 2);
- printf(" %d (%d)", lastlen[dir][lastconn], cp - chdr);
- }
- #else
- #include <sys/types.h>
- #include <sys/time.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 */
- }
- #endif
-