1 /* $OpenBSD: print-sl.c,v 1.14 2009/10/27 23:59:55 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1995, 1996, 1997 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 */ 23 24 #ifdef HAVE_NET_SLIP_H 25 #include <sys/param.h> 26 #include <sys/time.h> 27 #include <sys/timeb.h> 28 #include <sys/file.h> 29 #include <sys/ioctl.h> 30 #include <sys/mbuf.h> 31 #include <sys/socket.h> 32 33 struct rtentry; 34 #include <net/if.h> 35 36 #include <netinet/in.h> 37 #include <netinet/in_systm.h> 38 #include <netinet/ip.h> 39 #include <netinet/if_ether.h> 40 #include <netinet/udp.h> 41 #include <netinet/tcp.h> 42 43 #include <net/slcompress.h> 44 #include <net/slip.h> 45 46 #include <ctype.h> 47 #include <netdb.h> 48 #include <pcap.h> 49 #include <stdio.h> 50 51 #include "interface.h" 52 #include "addrtoname.h" 53 #include "extract.h" /* must come after interface.h */ 54 55 static u_int lastlen[2][256]; 56 static u_int lastconn = 255; 57 58 static void sliplink_print(const u_char *, const struct ip *, u_int); 59 static void compressed_sl_print(const u_char *, const struct ip *, u_int, int); 60 61 /* XXX BSD/OS 2.1 compatibility */ 62 #if !defined(SLIP_HDRLEN) && defined(SLC_BPFHDR) 63 #define SLIP_HDRLEN SLC_BPFHDR 64 #define SLX_DIR 0 65 #define SLX_CHDR (SLC_BPFHDRLEN - 1) 66 #define CHDR_LEN (SLC_BPFHDR - SLC_BPFHDRLEN) 67 #endif 68 69 /* XXX needs more hacking to work right */ 70 71 void 72 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 73 { 74 register u_int caplen = h->caplen; 75 register u_int length = h->len; 76 register const struct ip *ip; 77 78 ts_print(&h->ts); 79 80 if (caplen < SLIP_HDRLEN) { 81 printf("[|slip]"); 82 goto out; 83 } 84 /* 85 * Some printers want to get back at the link level addresses, 86 * and/or check that they're not walking off the end of the packet. 87 * Rather than pass them all the way down, we set these globals. 88 */ 89 packetp = p; 90 snapend = p + caplen; 91 92 length -= SLIP_HDRLEN; 93 94 ip = (struct ip *)(p + SLIP_HDRLEN); 95 96 if (eflag) 97 sliplink_print(p, ip, length); 98 99 switch (ip->ip_v) { 100 case 4: 101 ip_print((u_char *)ip, length); 102 break; 103 #ifdef INET6 104 case 6: 105 ip6_print((u_char *)ip, length); 106 break; 107 #endif 108 default: 109 printf ("ip v%d", ip->ip_v); 110 } 111 112 if (xflag) 113 default_print((u_char *)ip, caplen - SLIP_HDRLEN); 114 out: 115 putchar('\n'); 116 } 117 118 119 void 120 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 121 { 122 register u_int caplen = h->caplen; 123 register u_int length = h->len; 124 register const struct ip *ip; 125 126 ts_print(&h->ts); 127 128 if (caplen < SLIP_HDRLEN) { 129 printf("[|slip]"); 130 goto out; 131 } 132 /* 133 * Some printers want to get back at the link level addresses, 134 * and/or check that they're not walking off the end of the packet. 135 * Rather than pass them all the way down, we set these globals. 136 */ 137 packetp = p; 138 snapend = p + caplen; 139 140 length -= SLIP_HDRLEN; 141 142 ip = (struct ip *)(p + SLIP_HDRLEN); 143 144 #ifdef notdef 145 if (eflag) 146 sliplink_print(p, ip, length); 147 #endif 148 149 ip_print((u_char *)ip, length); 150 151 if (xflag) 152 default_print((u_char *)ip, caplen - SLIP_HDRLEN); 153 out: 154 putchar('\n'); 155 } 156 157 static void 158 sliplink_print(register const u_char *p, register const struct ip *ip, 159 register u_int length) 160 { 161 int dir; 162 u_int hlen; 163 164 dir = p[SLX_DIR]; 165 putchar(dir == SLIPDIR_IN ? 'I' : 'O'); 166 putchar(' '); 167 168 if (nflag) { 169 /* XXX just dump the header */ 170 register int i; 171 172 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i) 173 printf("%02x.", p[i]); 174 printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]); 175 return; 176 } 177 switch (p[SLX_CHDR] & 0xf0) { 178 179 case TYPE_IP: 180 printf("ip %d: ", length + SLIP_HDRLEN); 181 break; 182 183 case TYPE_UNCOMPRESSED_TCP: 184 /* 185 * The connection id is stored in the IP protocol field. 186 * Get it from the link layer since sl_uncompress_tcp() 187 * has restored the IP header copy to IPPROTO_TCP. 188 */ 189 lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p; 190 hlen = ip->ip_hl; 191 hlen += ((struct tcphdr *)&((int *)ip)[hlen])->th_off; 192 lastlen[dir][lastconn] = length - (hlen << 2); 193 printf("utcp %d: ", lastconn); 194 break; 195 196 default: 197 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) { 198 compressed_sl_print(&p[SLX_CHDR], ip, 199 length, dir); 200 printf(": "); 201 } else 202 printf("slip-%d!: ", p[SLX_CHDR]); 203 } 204 } 205 206 static const u_char * 207 print_sl_change(const char *str, register const u_char *cp) 208 { 209 register u_int i; 210 211 if ((i = *cp++) == 0) { 212 i = EXTRACT_16BITS(cp); 213 cp += 2; 214 } 215 printf(" %s%d", str, i); 216 return (cp); 217 } 218 219 static const u_char * 220 print_sl_winchange(register const u_char *cp) 221 { 222 register short i; 223 224 if ((i = *cp++) == 0) { 225 i = EXTRACT_16BITS(cp); 226 cp += 2; 227 } 228 if (i >= 0) 229 printf(" W+%d", i); 230 else 231 printf(" W%d", i); 232 return (cp); 233 } 234 235 static void 236 compressed_sl_print(const u_char *chdr, const struct ip *ip, 237 u_int length, int dir) 238 { 239 register const u_char *cp = chdr; 240 register u_int flags, hlen; 241 242 flags = *cp++; 243 if (flags & NEW_C) { 244 lastconn = *cp++; 245 printf("ctcp %d", lastconn); 246 } else 247 printf("ctcp *"); 248 249 /* skip tcp checksum */ 250 cp += 2; 251 252 switch (flags & SPECIALS_MASK) { 253 case SPECIAL_I: 254 printf(" *SA+%d", lastlen[dir][lastconn]); 255 break; 256 257 case SPECIAL_D: 258 printf(" *S+%d", lastlen[dir][lastconn]); 259 break; 260 261 default: 262 if (flags & NEW_U) 263 cp = print_sl_change("U=", cp); 264 if (flags & NEW_W) 265 cp = print_sl_winchange(cp); 266 if (flags & NEW_A) 267 cp = print_sl_change("A+", cp); 268 if (flags & NEW_S) 269 cp = print_sl_change("S+", cp); 270 break; 271 } 272 if (flags & NEW_I) 273 cp = print_sl_change("I+", cp); 274 275 /* 276 * 'hlen' is the length of the uncompressed TCP/IP header (in words). 277 * 'cp - chdr' is the length of the compressed header. 278 * 'length - hlen' is the amount of data in the packet. 279 */ 280 hlen = ip->ip_hl; 281 hlen += ((struct tcphdr *)&((int32_t *)ip)[hlen])->th_off; 282 lastlen[dir][lastconn] = length - (hlen << 2); 283 printf(" %d (%d)", lastlen[dir][lastconn], (int)(cp - chdr)); 284 } 285 #else 286 #include <sys/types.h> 287 #include <sys/time.h> 288 289 #include <pcap.h> 290 #include <stdio.h> 291 292 #include "interface.h" 293 294 void 295 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 296 { 297 298 error("not configured for slip"); 299 /* NOTREACHED */ 300 } 301 302 void 303 sl_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 304 { 305 306 error("not configured for slip"); 307 /* NOTREACHED */ 308 } 309 #endif 310