The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1995, 1996, 1997 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that: (1) source code distributions |
| 7 | * retain the above copyright notice and this paragraph in its entirety, (2) |
| 8 | * distributions including binary code include the above copyright notice and |
| 9 | * this paragraph in its entirety in the documentation or other materials |
| 10 | * provided with the distribution, and (3) all advertising materials mentioning |
| 11 | * features or use of this software display the following acknowledgement: |
| 12 | * ``This product includes software developed by the University of California, |
| 13 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| 14 | * the University nor the names of its contributors may be used to endorse |
| 15 | * or promote products derived from this software without specific prior |
| 16 | * written permission. |
| 17 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| 18 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| 19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 20 | */ |
| 21 | |
| 22 | #ifndef lint |
| 23 | static const char rcsid[] _U_ = |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 24 | "@(#) $Header: /tcpdump/master/tcpdump/print-sl.c,v 1.65 2005-04-06 21:32:42 mcr Exp $ (LBL)"; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 25 | #endif |
| 26 | |
| 27 | #ifdef HAVE_CONFIG_H |
| 28 | #include "config.h" |
| 29 | #endif |
| 30 | |
| 31 | #include <tcpdump-stdinc.h> |
| 32 | |
| 33 | #include <pcap.h> |
| 34 | #include <stdio.h> |
| 35 | |
| 36 | #include "interface.h" |
| 37 | #include "addrtoname.h" |
| 38 | #include "extract.h" /* must come after interface.h */ |
| 39 | |
| 40 | #include "ip.h" |
| 41 | #include "tcp.h" |
| 42 | #include "slip.h" |
| 43 | #include "slcompress.h" |
| 44 | |
| 45 | static u_int lastlen[2][256]; |
| 46 | static u_int lastconn = 255; |
| 47 | |
| 48 | static void sliplink_print(const u_char *, const struct ip *, u_int); |
| 49 | static void compressed_sl_print(const u_char *, const struct ip *, u_int, int); |
| 50 | |
| 51 | u_int |
| 52 | sl_if_print(const struct pcap_pkthdr *h, const u_char *p) |
| 53 | { |
| 54 | register u_int caplen = h->caplen; |
| 55 | register u_int length = h->len; |
| 56 | register const struct ip *ip; |
| 57 | |
| 58 | if (caplen < SLIP_HDRLEN) { |
| 59 | printf("[|slip]"); |
| 60 | return (caplen); |
| 61 | } |
| 62 | |
| 63 | length -= SLIP_HDRLEN; |
| 64 | |
| 65 | ip = (struct ip *)(p + SLIP_HDRLEN); |
| 66 | |
| 67 | if (eflag) |
| 68 | sliplink_print(p, ip, length); |
| 69 | |
| 70 | switch (IP_V(ip)) { |
| 71 | case 4: |
| 72 | ip_print(gndo, (u_char *)ip, length); |
| 73 | break; |
| 74 | #ifdef INET6 |
| 75 | case 6: |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 76 | ip6_print(gndo, (u_char *)ip, length); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 77 | break; |
| 78 | #endif |
| 79 | default: |
| 80 | printf ("ip v%d", IP_V(ip)); |
| 81 | } |
| 82 | |
| 83 | return (SLIP_HDRLEN); |
| 84 | } |
| 85 | |
| 86 | u_int |
| 87 | sl_bsdos_if_print(const struct pcap_pkthdr *h, const u_char *p) |
| 88 | { |
| 89 | register u_int caplen = h->caplen; |
| 90 | register u_int length = h->len; |
| 91 | register const struct ip *ip; |
| 92 | |
| 93 | if (caplen < SLIP_HDRLEN) { |
| 94 | printf("[|slip]"); |
| 95 | return (caplen); |
| 96 | } |
| 97 | |
| 98 | length -= SLIP_HDRLEN; |
| 99 | |
| 100 | ip = (struct ip *)(p + SLIP_HDRLEN); |
| 101 | |
| 102 | #ifdef notdef |
| 103 | if (eflag) |
| 104 | sliplink_print(p, ip, length); |
| 105 | #endif |
| 106 | |
| 107 | ip_print(gndo, (u_char *)ip, length); |
| 108 | |
| 109 | return (SLIP_HDRLEN); |
| 110 | } |
| 111 | |
| 112 | static void |
| 113 | sliplink_print(register const u_char *p, register const struct ip *ip, |
| 114 | register u_int length) |
| 115 | { |
| 116 | int dir; |
| 117 | u_int hlen; |
| 118 | |
| 119 | dir = p[SLX_DIR]; |
| 120 | putchar(dir == SLIPDIR_IN ? 'I' : 'O'); |
| 121 | putchar(' '); |
| 122 | |
| 123 | if (nflag) { |
| 124 | /* XXX just dump the header */ |
| 125 | register int i; |
| 126 | |
| 127 | for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i) |
| 128 | printf("%02x.", p[i]); |
| 129 | printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]); |
| 130 | return; |
| 131 | } |
| 132 | switch (p[SLX_CHDR] & 0xf0) { |
| 133 | |
| 134 | case TYPE_IP: |
| 135 | printf("ip %d: ", length + SLIP_HDRLEN); |
| 136 | break; |
| 137 | |
| 138 | case TYPE_UNCOMPRESSED_TCP: |
| 139 | /* |
| 140 | * The connection id is stored in the IP protocol field. |
| 141 | * Get it from the link layer since sl_uncompress_tcp() |
| 142 | * has restored the IP header copy to IPPROTO_TCP. |
| 143 | */ |
| 144 | lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p; |
| 145 | hlen = IP_HL(ip); |
| 146 | hlen += TH_OFF((struct tcphdr *)&((int *)ip)[hlen]); |
| 147 | lastlen[dir][lastconn] = length - (hlen << 2); |
| 148 | printf("utcp %d: ", lastconn); |
| 149 | break; |
| 150 | |
| 151 | default: |
| 152 | if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) { |
| 153 | compressed_sl_print(&p[SLX_CHDR], ip, |
| 154 | length, dir); |
| 155 | printf(": "); |
| 156 | } else |
| 157 | printf("slip-%d!: ", p[SLX_CHDR]); |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | static const u_char * |
| 162 | print_sl_change(const char *str, register const u_char *cp) |
| 163 | { |
| 164 | register u_int i; |
| 165 | |
| 166 | if ((i = *cp++) == 0) { |
| 167 | i = EXTRACT_16BITS(cp); |
| 168 | cp += 2; |
| 169 | } |
| 170 | printf(" %s%d", str, i); |
| 171 | return (cp); |
| 172 | } |
| 173 | |
| 174 | static const u_char * |
| 175 | print_sl_winchange(register const u_char *cp) |
| 176 | { |
| 177 | register short i; |
| 178 | |
| 179 | if ((i = *cp++) == 0) { |
| 180 | i = EXTRACT_16BITS(cp); |
| 181 | cp += 2; |
| 182 | } |
| 183 | if (i >= 0) |
| 184 | printf(" W+%d", i); |
| 185 | else |
| 186 | printf(" W%d", i); |
| 187 | return (cp); |
| 188 | } |
| 189 | |
| 190 | static void |
| 191 | compressed_sl_print(const u_char *chdr, const struct ip *ip, |
| 192 | u_int length, int dir) |
| 193 | { |
| 194 | register const u_char *cp = chdr; |
| 195 | register u_int flags, hlen; |
| 196 | |
| 197 | flags = *cp++; |
| 198 | if (flags & NEW_C) { |
| 199 | lastconn = *cp++; |
| 200 | printf("ctcp %d", lastconn); |
| 201 | } else |
| 202 | printf("ctcp *"); |
| 203 | |
| 204 | /* skip tcp checksum */ |
| 205 | cp += 2; |
| 206 | |
| 207 | switch (flags & SPECIALS_MASK) { |
| 208 | case SPECIAL_I: |
| 209 | printf(" *SA+%d", lastlen[dir][lastconn]); |
| 210 | break; |
| 211 | |
| 212 | case SPECIAL_D: |
| 213 | printf(" *S+%d", lastlen[dir][lastconn]); |
| 214 | break; |
| 215 | |
| 216 | default: |
| 217 | if (flags & NEW_U) |
| 218 | cp = print_sl_change("U=", cp); |
| 219 | if (flags & NEW_W) |
| 220 | cp = print_sl_winchange(cp); |
| 221 | if (flags & NEW_A) |
| 222 | cp = print_sl_change("A+", cp); |
| 223 | if (flags & NEW_S) |
| 224 | cp = print_sl_change("S+", cp); |
| 225 | break; |
| 226 | } |
| 227 | if (flags & NEW_I) |
| 228 | cp = print_sl_change("I+", cp); |
| 229 | |
| 230 | /* |
| 231 | * 'hlen' is the length of the uncompressed TCP/IP header (in words). |
| 232 | * 'cp - chdr' is the length of the compressed header. |
| 233 | * 'length - hlen' is the amount of data in the packet. |
| 234 | */ |
| 235 | hlen = IP_HL(ip); |
| 236 | hlen += TH_OFF((struct tcphdr *)&((int32_t *)ip)[hlen]); |
| 237 | lastlen[dir][lastconn] = length - (hlen << 2); |
| 238 | printf(" %d (%ld)", lastlen[dir][lastconn], (long)(cp - chdr)); |
| 239 | } |