1 /* 2 * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1995, 1996 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 char rcsid[] = 24 "@(#)$Header: print-sl.c,v 1.38 96/07/15 18:23:25 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 <netinet/if_ether.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 <signal.h> 58 #include <stdio.h> 59 60 #include "interface.h" 61 #include "addrtoname.h" 62 #include "extract.h" /* must come after interface.h */ 63 64 static u_int lastlen[2][256]; 65 static u_int lastconn = 255; 66 67 static void sliplink_print(const u_char *, const struct ip *, u_int); 68 static void compressed_sl_print(const u_char *, const struct ip *, u_int, int); 69 70 /* XXX BSD/OS 2.1 compatibility */ 71 #if !defined(SLIP_HDRLEN) && defined(SLC_BPFHDR) 72 #define SLIP_HDRLEN SLC_BPFHDR 73 #define SLX_DIR 0 74 #define SLX_CHDR (SLC_BPFHDRLEN - 1) 75 #define CHDR_LEN (SLC_BPFHDR - SLC_BPFHDRLEN) 76 #endif 77 78 void 79 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 80 { 81 register u_int caplen = h->caplen; 82 register u_int length = h->len; 83 register const struct ip *ip; 84 85 ts_print(&h->ts); 86 87 if (caplen < SLIP_HDRLEN) { 88 printf("[|slip]"); 89 goto out; 90 } 91 /* 92 * Some printers want to get back at the link level addresses, 93 * and/or check that they're not walking off the end of the packet. 94 * Rather than pass them all the way down, we set these globals. 95 */ 96 packetp = p; 97 snapend = p + caplen; 98 99 length -= SLIP_HDRLEN; 100 101 ip = (struct ip *)(p + SLIP_HDRLEN); 102 103 if (eflag) 104 sliplink_print(p, ip, length); 105 106 ip_print((u_char *)ip, length); 107 108 if (xflag) 109 default_print((u_char *)ip, caplen - SLIP_HDRLEN); 110 out: 111 putchar('\n'); 112 } 113 114 static void 115 sliplink_print(register const u_char *p, register const struct ip *ip, 116 register u_int length) 117 { 118 int dir; 119 u_int hlen; 120 121 dir = p[SLX_DIR]; 122 putchar(dir == SLIPDIR_IN ? 'I' : 'O'); 123 putchar(' '); 124 125 if (nflag) { 126 /* XXX just dump the header */ 127 register int i; 128 129 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i) 130 printf("%02x.", p[i]); 131 printf("%02x: ", p[SLX_CHDR + CHDR_LEN - 1]); 132 return; 133 } 134 switch (p[SLX_CHDR] & 0xf0) { 135 136 case TYPE_IP: 137 printf("ip %d: ", length + SLIP_HDRLEN); 138 break; 139 140 case TYPE_UNCOMPRESSED_TCP: 141 /* 142 * The connection id is stored in the IP protcol field. 143 * Get it from the link layer since sl_uncompress_tcp() 144 * has restored the IP header copy to IPPROTO_TCP. 145 */ 146 lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p; 147 hlen = ip->ip_hl; 148 hlen += ((struct tcphdr *)&((int *)ip)[hlen])->th_off; 149 lastlen[dir][lastconn] = length - (hlen << 2); 150 printf("utcp %d: ", lastconn); 151 break; 152 153 default: 154 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) { 155 compressed_sl_print(&p[SLX_CHDR], ip, 156 length, dir); 157 printf(": "); 158 } else 159 printf("slip-%d!: ", p[SLX_CHDR]); 160 } 161 } 162 163 static const u_char * 164 print_sl_change(const char *str, register const u_char *cp) 165 { 166 register u_int i; 167 168 if ((i = *cp++) == 0) { 169 i = EXTRACT_16BITS(cp); 170 cp += 2; 171 } 172 printf(" %s%d", str, i); 173 return (cp); 174 } 175 176 static const u_char * 177 print_sl_winchange(register const u_char *cp) 178 { 179 register short i; 180 181 if ((i = *cp++) == 0) { 182 i = EXTRACT_16BITS(cp); 183 cp += 2; 184 } 185 if (i >= 0) 186 printf(" W+%d", i); 187 else 188 printf(" W%d", i); 189 return (cp); 190 } 191 192 static void 193 compressed_sl_print(const u_char *chdr, const struct ip *ip, 194 u_int length, int dir) 195 { 196 register const u_char *cp = chdr; 197 register u_int flags, hlen; 198 199 flags = *cp++; 200 if (flags & NEW_C) { 201 lastconn = *cp++; 202 printf("ctcp %d", lastconn); 203 } else 204 printf("ctcp *"); 205 206 /* skip tcp checksum */ 207 cp += 2; 208 209 switch (flags & SPECIALS_MASK) { 210 case SPECIAL_I: 211 printf(" *SA+%d", lastlen[dir][lastconn]); 212 break; 213 214 case SPECIAL_D: 215 printf(" *S+%d", lastlen[dir][lastconn]); 216 break; 217 218 default: 219 if (flags & NEW_U) 220 cp = print_sl_change("U=", cp); 221 if (flags & NEW_W) 222 cp = print_sl_winchange(cp); 223 if (flags & NEW_A) 224 cp = print_sl_change("A+", cp); 225 if (flags & NEW_S) 226 cp = print_sl_change("S+", cp); 227 break; 228 } 229 if (flags & NEW_I) 230 cp = print_sl_change("I+", cp); 231 232 /* 233 * 'hlen' is the length of the uncompressed TCP/IP header (in words). 234 * 'cp - chdr' is the length of the compressed header. 235 * 'length - hlen' is the amount of data in the packet. 236 */ 237 hlen = ip->ip_hl; 238 hlen += ((struct tcphdr *)&((int32_t *)ip)[hlen])->th_off; 239 lastlen[dir][lastconn] = length - (hlen << 2); 240 printf(" %d (%d)", lastlen[dir][lastconn], cp - chdr); 241 } 242 #else 243 #include <sys/types.h> 244 #include <sys/time.h> 245 246 #include <stdio.h> 247 248 #include "interface.h" 249 void 250 sl_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 251 { 252 253 error("not configured for slip"); 254 /* NOTREACHED */ 255 } 256 #endif 257