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/* $OpenBSD: print-sl.c,v 1.20 2017/10/30 10:07:44 mpi Exp $ */ |
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/* |
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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/time.h> |
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#include <sys/file.h> |
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#include <sys/ioctl.h> |
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#include <sys/socket.h> |
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struct rtentry; |
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#include <net/if.h> |
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#include <netinet/in.h> |
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#include <netinet/ip.h> |
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#include <netinet/if_ether.h> |
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#include <netinet/udp.h> |
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#include <netinet/tcp.h> |
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#include <net/slcompress.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 <stdio.h> |
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#include <limits.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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/* |
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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 /* BPF SLIP header length */ |
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/* Offsets into BPF SLIP header. */ |
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#define SLX_DIR 0 /* direction; see below */ |
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#define SLX_CHDR 1 /* compressed header data */ |
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#define CHDR_LEN 15 /* length of compressed header data */ |
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#define SLIPDIR_IN 0 /* incoming */ |
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#define SLIPDIR_OUT 1 /* outgoing */ |
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/* XXX needs more hacking to work right */ |
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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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u_int caplen = h->caplen; |
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u_int length = h->len; |
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const struct ip *ip; |
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ts_print(&h->ts); |
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if (caplen < SLIP_HDRLEN || length < 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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switch (ip->ip_v) { |
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case 4: |
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ip_print((u_char *)ip, length); |
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break; |
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#ifdef INET6 |
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case 6: |
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ip6_print((u_char *)ip, length); |
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break; |
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#endif |
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default: |
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printf ("ip v%d", ip->ip_v); |
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} |
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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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void |
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sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) |
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{ |
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u_int caplen = h->caplen; |
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u_int length = h->len; |
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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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#ifdef notdef |
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if (eflag) |
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sliplink_print(p, ip, length); |
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#endif |
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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(const u_char *p, const struct ip *ip, 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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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 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->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, const u_char *cp) |
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{ |
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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(const u_char *cp) |
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{ |
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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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const u_char *cp = chdr; |
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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], (int)(cp - chdr)); |
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} |