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[] = 24 "@(#) $Header: print-sl.c,v 1.42 97/06/12 14:21:35 leres Exp $ (LBL)"; 25 #endif 26 27 #ifdef HAVE_NET_SLIP_H 28 #include <sys/param.h> 29 #include <sys/time.h> 30 #include <sys/timeb.h> 31 #include <sys/file.h> 32 #include <sys/ioctl.h> 33 #include <sys/mbuf.h> 34 #include <sys/socket.h> 35 36 #if __STDC__ 37 struct rtentry; 38 #endif 39 #include <net/if.h> 40 41 #include <netinet/in.h> 42 #include <netinet/in_systm.h> 43 #include <netinet/ip.h> 44 #include <net/ethernet.h> 45 #include <netinet/ip_var.h> 46 #include <netinet/udp.h> 47 #include <netinet/udp_var.h> 48 #include <netinet/tcp.h> 49 #include <netinet/tcpip.h> 50 51 #include <net/slcompress.h> 52 #include <net/slip.h> 53 54 #include <ctype.h> 55 #include <netdb.h> 56 #include <pcap.h> 57 #include <stdio.h> 58 59 #include "interface.h" 60 #include "addrtoname.h" 61 #include "extract.h" /* must come after interface.h */ 62 63 static u_int lastlen[2][256]; 64 static u_int lastconn = 255; 65 66 static void sliplink_print(const u_char *, const struct ip *, u_int); 67 static void compressed_sl_print(const u_char *, const struct ip *, u_int, int); 68 69 /* XXX BSD/OS 2.1 compatibility */ 70 #if !defined(SLIP_HDRLEN) && defined(SLC_BPFHDR) 71 #define SLIP_HDRLEN SLC_BPFHDR 72 #define SLX_DIR 0 73 #define SLX_CHDR (SLC_BPFHDRLEN - 1) 74 #define CHDR_LEN (SLC_BPFHDR - SLC_BPFHDRLEN) 75 #endif 76 77 /* XXX needs more hacking to work right */ 78 79 void 80 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 81 { 82 register u_int caplen = h->caplen; 83 register u_int length = h->len; 84 register const struct ip *ip; 85 86 ts_print(&h->ts); 87 88 if (caplen < SLIP_HDRLEN) { 89 printf("[|slip]"); 90 goto out; 91 } 92 /* 93 * Some printers want to get back at the link level addresses, 94 * and/or check that they're not walking off the end of the packet. 95 * Rather than pass them all the way down, we set these globals. 96 */ 97 packetp = p; 98 snapend = p + caplen; 99 100 length -= SLIP_HDRLEN; 101 102 ip = (struct ip *)(p + SLIP_HDRLEN); 103 104 if (eflag) 105 sliplink_print(p, ip, length); 106 107 ip_print((u_char *)ip, length); 108 109 if (xflag) 110 default_print((u_char *)ip, caplen - SLIP_HDRLEN); 111 out: 112 putchar('\n'); 113 } 114 115 116 void 117 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 118 { 119 register u_int caplen = h->caplen; 120 register u_int length = h->len; 121 register const struct ip *ip; 122 123 ts_print(&h->ts); 124 125 if (caplen < SLIP_HDRLEN) { 126 printf("[|slip]"); 127 goto out; 128 } 129 /* 130 * Some printers want to get back at the link level addresses, 131 * and/or check that they're not walking off the end of the packet. 132 * Rather than pass them all the way down, we set these globals. 133 */ 134 packetp = p; 135 snapend = p + caplen; 136 137 length -= SLIP_HDRLEN; 138 139 ip = (struct ip *)(p + SLIP_HDRLEN); 140 141 #ifdef notdef 142 if (eflag) 143 sliplink_print(p, ip, length); 144 #endif 145 146 ip_print((u_char *)ip, length); 147 148 if (xflag) 149 default_print((u_char *)ip, caplen - SLIP_HDRLEN); 150 out: 151 putchar('\n'); 152 } 153 154 static void 155 sliplink_print(register const u_char *p, register const struct ip *ip, 156 register u_int length) 157 { 158 int dir; 159 u_int hlen; 160 161 dir = p[SLX_DIR]; 162 putchar(dir == SLIPDIR_IN ? 'I' : 'O'); 163 putchar(' '); 164 165 if (nflag) { 166 /* XXX just dump the header */ 167 register int i; 168 169 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i) 170 printf("%02x.", p[i]); 171 printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]); 172 return; 173 } 174 switch (p[SLX_CHDR] & 0xf0) { 175 176 case TYPE_IP: 177 printf("ip %d: ", length + SLIP_HDRLEN); 178 break; 179 180 case TYPE_UNCOMPRESSED_TCP: 181 /* 182 * The connection id is stored in the IP protocol field. 183 * Get it from the link layer since sl_uncompress_tcp() 184 * has restored the IP header copy to IPPROTO_TCP. 185 */ 186 lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p; 187 hlen = ip->ip_hl; 188 hlen += ((struct tcphdr *)&((int *)ip)[hlen])->th_off; 189 lastlen[dir][lastconn] = length - (hlen << 2); 190 printf("utcp %d: ", lastconn); 191 break; 192 193 default: 194 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) { 195 compressed_sl_print(&p[SLX_CHDR], ip, 196 length, dir); 197 printf(": "); 198 } else 199 printf("slip-%d!: ", p[SLX_CHDR]); 200 } 201 } 202 203 static const u_char * 204 print_sl_change(const char *str, register const u_char *cp) 205 { 206 register u_int i; 207 208 if ((i = *cp++) == 0) { 209 i = EXTRACT_16BITS(cp); 210 cp += 2; 211 } 212 printf(" %s%d", str, i); 213 return (cp); 214 } 215 216 static const u_char * 217 print_sl_winchange(register const u_char *cp) 218 { 219 register short i; 220 221 if ((i = *cp++) == 0) { 222 i = EXTRACT_16BITS(cp); 223 cp += 2; 224 } 225 if (i >= 0) 226 printf(" W+%d", i); 227 else 228 printf(" W%d", i); 229 return (cp); 230 } 231 232 static void 233 compressed_sl_print(const u_char *chdr, const struct ip *ip, 234 u_int length, int dir) 235 { 236 register const u_char *cp = chdr; 237 register u_int flags, hlen; 238 239 flags = *cp++; 240 if (flags & NEW_C) { 241 lastconn = *cp++; 242 printf("ctcp %d", lastconn); 243 } else 244 printf("ctcp *"); 245 246 /* skip tcp checksum */ 247 cp += 2; 248 249 switch (flags & SPECIALS_MASK) { 250 case SPECIAL_I: 251 printf(" *SA+%d", lastlen[dir][lastconn]); 252 break; 253 254 case SPECIAL_D: 255 printf(" *S+%d", lastlen[dir][lastconn]); 256 break; 257 258 default: 259 if (flags & NEW_U) 260 cp = print_sl_change("U=", cp); 261 if (flags & NEW_W) 262 cp = print_sl_winchange(cp); 263 if (flags & NEW_A) 264 cp = print_sl_change("A+", cp); 265 if (flags & NEW_S) 266 cp = print_sl_change("S+", cp); 267 break; 268 } 269 if (flags & NEW_I) 270 cp = print_sl_change("I+", cp); 271 272 /* 273 * 'hlen' is the length of the uncompressed TCP/IP header (in words). 274 * 'cp - chdr' is the length of the compressed header. 275 * 'length - hlen' is the amount of data in the packet. 276 */ 277 hlen = ip->ip_hl; 278 hlen += ((struct tcphdr *)&((int32_t *)ip)[hlen])->th_off; 279 lastlen[dir][lastconn] = length - (hlen << 2); 280 printf(" %d (%d)", lastlen[dir][lastconn], cp - chdr); 281 } 282 #else 283 #include <sys/types.h> 284 #include <sys/time.h> 285 286 #include <pcap.h> 287 #include <stdio.h> 288 289 #include "interface.h" 290 291 void 292 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 293 { 294 295 error("not configured for slip"); 296 /* NOTREACHED */ 297 } 298 299 void 300 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 301 { 302 303 error("not configured for slip"); 304 /* NOTREACHED */ 305 } 306 #endif 307