1/* $NetBSD: print-tcp.c,v 1.9 2007/07/26 18:15:12 plunky Exp $ */ 2 |
3/* 4 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Copyright (c) 1999-2004 The tcpdump.org project 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that: (1) source code distributions 11 * retain the above copyright notice and this paragraph in its entirety, (2) 12 * distributions including binary code include the above copyright notice and 13 * this paragraph in its entirety in the documentation or other materials 14 * provided with the distribution, and (3) all advertising materials mentioning 15 * features or use of this software display the following acknowledgement: 16 * ``This product includes software developed by the University of California, 17 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 18 * the University nor the names of its contributors may be used to endorse 19 * or promote products derived from this software without specific prior 20 * written permission. 21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 22 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 24 */ 25 26#ifndef lint 27static const char rcsid[] _U_ =
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26 "@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.120.2.3 2005/10/16 06:05:46 guy Exp $ (LBL)";
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28"@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.130.2.3 2007-12-22 03:08:45 guy Exp $ (LBL)"; 29 #else 30__RCSID("$NetBSD: print-tcp.c,v 1.8 2007/07/24 11:53:48 drochner Exp $"); |
31#endif 32 33#ifdef HAVE_CONFIG_H 34#include "config.h" 35#endif 36 37#include <tcpdump-stdinc.h> 38 39#include <stdio.h> 40#include <stdlib.h> 41#include <string.h> 42 43#include "interface.h" 44#include "addrtoname.h" 45#include "extract.h" 46 47#include "tcp.h" 48 49#include "ip.h" 50#ifdef INET6 51#include "ip6.h" 52#endif 53#include "ipproto.h" 54#include "rpc_auth.h" 55#include "rpc_msg.h" 56 57#include "nameser.h" 58 59#ifdef HAVE_LIBCRYPTO 60#include <openssl/md5.h> 61 62#define SIGNATURE_VALID 0 63#define SIGNATURE_INVALID 1 64#define CANT_CHECK_SIGNATURE 2 65 66static int tcp_verify_signature(const struct ip *ip, const struct tcphdr *tp,
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63 const u_char *data, int length, const u_char *rcvsig);
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67 const u_char *data, int length, const u_char *rcvsig); |
68#endif 69 70static void print_tcp_rst_data(register const u_char *sp, u_int length); 71 72#define MAX_RST_DATA_LEN 30 73 74 75struct tha { 76#ifndef INET6
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73 struct in_addr src;
74 struct in_addr dst;
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77 struct in_addr src; 78 struct in_addr dst; |
79#else
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76 struct in6_addr src;
77 struct in6_addr dst;
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80 struct in6_addr src; 81 struct in6_addr dst; |
82#endif /*INET6*/
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79 u_int port;
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83 u_int port; |
84}; 85 86struct tcp_seq_hash {
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83 struct tcp_seq_hash *nxt;
84 struct tha addr;
85 tcp_seq seq;
86 tcp_seq ack;
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87 struct tcp_seq_hash *nxt; 88 struct tha addr; 89 tcp_seq seq; 90 tcp_seq ack; |
91}; 92 93#define TSEQ_HASHSIZE 919 94 95/* These tcp optinos do not have the size octet */ 96#define ZEROLENOPT(o) ((o) == TCPOPT_EOL || (o) == TCPOPT_NOP) 97 98static struct tcp_seq_hash tcp_seq_hash[TSEQ_HASHSIZE]; 99
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100struct tok tcp_flag_values[] = { 101 { TH_FIN, "F" }, 102 { TH_SYN, "S" }, 103 { TH_RST, "R" }, 104 { TH_PUSH, "P" }, 105 { TH_ACK, "." }, 106 { TH_URG, "U" }, 107 { TH_ECNECHO, "E" }, 108 { TH_CWR, "W" }, 109 { 0, NULL } 110}; |
111
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97#ifndef TELNET_PORT
98#define TELNET_PORT 23
99#endif
100#ifndef BGP_PORT
101#define BGP_PORT 179
102#endif
103#define NETBIOS_SSN_PORT 139
104#ifndef PPTP_PORT
105#define PPTP_PORT 1723
106#endif
107#define BEEP_PORT 10288
108#ifndef NFS_PORT
109#define NFS_PORT 2049
110#endif
111#define MSDP_PORT 639
112#define LDP_PORT 646
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112struct tok tcp_option_values[] = { 113 { TCPOPT_EOL, "eol" }, 114 { TCPOPT_NOP, "nop" }, 115 { TCPOPT_MAXSEG, "mss" }, 116 { TCPOPT_WSCALE, "wscale" }, 117 { TCPOPT_SACKOK, "sackOK" }, 118 { TCPOPT_SACK, "sack" }, 119 { TCPOPT_ECHO, "echo" }, 120 { TCPOPT_ECHOREPLY, "echoreply" }, 121 { TCPOPT_TIMESTAMP, "TS" }, 122 { TCPOPT_CC, "cc" }, 123 { TCPOPT_CCNEW, "ccnew" }, 124 { TCPOPT_CCECHO, "" }, 125 { TCPOPT_SIGNATURE, "md5" }, 126 { TCPOPT_AUTH, "enhanced auth" }, 127 { 0, NULL } 128}; |
129 130static int tcp_cksum(register const struct ip *ip, 131 register const struct tcphdr *tp, 132 register u_int len) 133{
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118 union phu {
119 struct phdr {
120 u_int32_t src;
121 u_int32_t dst;
122 u_char mbz;
123 u_char proto;
124 u_int16_t len;
125 } ph;
126 u_int16_t pa[6];
127 } phu;
128 const u_int16_t *sp;
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134 union phu { 135 struct phdr { 136 u_int32_t src; 137 u_int32_t dst; 138 u_char mbz; 139 u_char proto; 140 u_int16_t len; 141 } ph; 142 u_int16_t pa[6]; 143 } phu; 144 const u_int16_t *sp; |
145
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130 /* pseudo-header.. */
131 phu.ph.len = htons((u_int16_t)len);
132 phu.ph.mbz = 0;
133 phu.ph.proto = IPPROTO_TCP;
134 memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t));
135 if (IP_HL(ip) == 5)
136 memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t));
137 else
138 phu.ph.dst = ip_finddst(ip);
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146 /* pseudo-header.. */ 147 phu.ph.len = htons((u_int16_t)len); 148 phu.ph.mbz = 0; 149 phu.ph.proto = IPPROTO_TCP; 150 memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t)); 151 if (IP_HL(ip) == 5) 152 memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t)); 153 else 154 phu.ph.dst = ip_finddst(ip); |
155
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140 sp = &phu.pa[0];
141 return in_cksum((u_short *)tp, len,
142 sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]);
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156 sp = &phu.pa[0]; 157 return in_cksum((u_short *)tp, len, 158 sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]); |
159} 160 161#ifdef INET6 162static int tcp6_cksum(const struct ip6_hdr *ip6, const struct tcphdr *tp,
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147 u_int len)
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163 u_int len) |
164{
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149 size_t i;
150 register const u_int16_t *sp;
151 u_int32_t sum;
152 union {
153 struct {
154 struct in6_addr ph_src;
155 struct in6_addr ph_dst;
156 u_int32_t ph_len;
157 u_int8_t ph_zero[3];
158 u_int8_t ph_nxt;
159 } ph;
160 u_int16_t pa[20];
161 } phu;
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165 size_t i; 166 u_int32_t sum = 0; 167 union { 168 struct { 169 struct in6_addr ph_src; 170 struct in6_addr ph_dst; 171 u_int32_t ph_len; 172 u_int8_t ph_zero[3]; 173 u_int8_t ph_nxt; 174 } ph; 175 u_int16_t pa[20]; 176 } phu; |
177
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163 /* pseudo-header */
164 memset(&phu, 0, sizeof(phu));
165 phu.ph.ph_src = ip6->ip6_src;
166 phu.ph.ph_dst = ip6->ip6_dst;
167 phu.ph.ph_len = htonl(len);
168 phu.ph.ph_nxt = IPPROTO_TCP;
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178 /* pseudo-header */ 179 memset(&phu, 0, sizeof(phu)); 180 phu.ph.ph_src = ip6->ip6_src; 181 phu.ph.ph_dst = ip6->ip6_dst; 182 phu.ph.ph_len = htonl(len); 183 phu.ph.ph_nxt = IPPROTO_TCP; |
184
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170 sum = 0;
171 for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++)
172 sum += phu.pa[i];
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185 for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++) 186 sum += phu.pa[i]; |
187
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174 sp = (const u_int16_t *)tp;
175
176 for (i = 0; i < (len & ~1); i += 2)
177 sum += *sp++;
178
179 if (len & 1)
180 sum += htons((*(const u_int8_t *)sp) << 8);
181
182 while (sum > 0xffff)
183 sum = (sum & 0xffff) + (sum >> 16);
184 sum = ~sum & 0xffff;
185
186 return (sum);
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188 return in_cksum((u_short *)tp, len, sum); |
189} 190#endif 191 192void 193tcp_print(register const u_char *bp, register u_int length, 194 register const u_char *bp2, int fragmented) 195{
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194 register const struct tcphdr *tp;
195 register const struct ip *ip;
196 register u_char flags;
197 register u_int hlen;
198 register char ch;
199 u_int16_t sport, dport, win, urp;
200 u_int32_t seq, ack, thseq, thack;
201 int threv;
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196 register const struct tcphdr *tp; 197 register const struct ip *ip; 198 register u_char flags; 199 register u_int hlen; 200 register char ch; 201 u_int16_t sport, dport, win, urp; 202 u_int32_t seq, ack, thseq, thack; 203 int threv; |
204#ifdef INET6
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203 register const struct ip6_hdr *ip6;
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205 register const struct ip6_hdr *ip6; |
206#endif 207
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206 tp = (struct tcphdr *)bp;
207 ip = (struct ip *)bp2;
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208 tp = (struct tcphdr *)bp; 209 ip = (struct ip *)bp2; |
210#ifdef INET6
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209 if (IP_V(ip) == 6)
210 ip6 = (struct ip6_hdr *)bp2;
211 else
212 ip6 = NULL;
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211 if (IP_V(ip) == 6) 212 ip6 = (struct ip6_hdr *)bp2; 213 else 214 ip6 = NULL; |
215#endif /*INET6*/
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214 ch = '\0';
215 if (!TTEST(tp->th_dport)) {
216 (void)printf("%s > %s: [|tcp]",
217 ipaddr_string(&ip->ip_src),
218 ipaddr_string(&ip->ip_dst));
219 return;
220 }
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216 ch = '\0'; 217 if (!TTEST(tp->th_dport)) { 218 (void)printf("%s > %s: [|tcp]", 219 ipaddr_string(&ip->ip_src), 220 ipaddr_string(&ip->ip_dst)); 221 return; 222 } |
223
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222 sport = EXTRACT_16BITS(&tp->th_sport);
223 dport = EXTRACT_16BITS(&tp->th_dport);
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224 sport = EXTRACT_16BITS(&tp->th_sport); 225 dport = EXTRACT_16BITS(&tp->th_dport); |
226
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225 hlen = TH_OFF(tp) * 4;
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227 hlen = TH_OFF(tp) * 4; |
228
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227 /*
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229 /* |
230 * If data present, header length valid, and NFS port used, 231 * assume NFS. 232 * Pass offset of data plus 4 bytes for RPC TCP msg length 233 * to NFS print routines. 234 */
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233 if (!qflag && hlen >= sizeof(*tp) && hlen <= length) {
234 if ((u_char *)tp + 4 + sizeof(struct sunrpc_msg) <= snapend &&
235 dport == NFS_PORT) {
236 nfsreq_print((u_char *)tp + hlen + 4, length - hlen,
237 (u_char *)ip);
238 return;
239 } else if ((u_char *)tp + 4 + sizeof(struct sunrpc_msg)
240 <= snapend &&
241 sport == NFS_PORT) {
242 nfsreply_print((u_char *)tp + hlen + 4, length - hlen,
243 (u_char *)ip);
244 return;
245 }
246 }
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235 if (!qflag && hlen >= sizeof(*tp) && hlen <= length && 236 (length - hlen) >= 4) { 237 u_char *fraglenp; 238 u_int32_t fraglen; 239 register struct sunrpc_msg *rp; 240 enum sunrpc_msg_type direction; 241 242 fraglenp = (u_char *)tp + hlen; 243 if (TTEST2(*fraglenp, 4)) { 244 fraglen = EXTRACT_32BITS(fraglenp) & 0x7FFFFFFF; 245 if (fraglen > (length - hlen) - 4) 246 fraglen = (length - hlen) - 4; 247 rp = (struct sunrpc_msg *)(fraglenp + 4); 248 if (TTEST(rp->rm_direction)) { 249 direction = (enum sunrpc_msg_type)EXTRACT_32BITS(&rp->rm_direction); 250 if (dport == NFS_PORT && 251 direction == SUNRPC_CALL) { 252 nfsreq_print((u_char *)rp, fraglen, 253 (u_char *)ip); 254 return; 255 } 256 if (sport == NFS_PORT && 257 direction == SUNRPC_REPLY) { 258 nfsreply_print((u_char *)rp, fraglen, 259 (u_char *)ip); 260 return; 261 } 262 } 263 } 264 } |
265#ifdef INET6
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248 if (ip6) {
249 if (ip6->ip6_nxt == IPPROTO_TCP) {
250 (void)printf("%s.%s > %s.%s: ",
251 ip6addr_string(&ip6->ip6_src),
252 tcpport_string(sport),
253 ip6addr_string(&ip6->ip6_dst),
254 tcpport_string(dport));
255 } else {
256 (void)printf("%s > %s: ",
257 tcpport_string(sport), tcpport_string(dport));
258 }
259 } else
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266 if (ip6) { 267 if (ip6->ip6_nxt == IPPROTO_TCP) { 268 (void)printf("%s.%s > %s.%s: ", 269 ip6addr_string(&ip6->ip6_src), 270 tcpport_string(sport), 271 ip6addr_string(&ip6->ip6_dst), 272 tcpport_string(dport)); 273 } else { 274 (void)printf("%s > %s: ", 275 tcpport_string(sport), tcpport_string(dport)); 276 } 277 } else |
278#endif /*INET6*/
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261 {
262 if (ip->ip_p == IPPROTO_TCP) {
263 (void)printf("%s.%s > %s.%s: ",
264 ipaddr_string(&ip->ip_src),
265 tcpport_string(sport),
266 ipaddr_string(&ip->ip_dst),
267 tcpport_string(dport));
268 } else {
269 (void)printf("%s > %s: ",
270 tcpport_string(sport), tcpport_string(dport));
271 }
272 }
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279 { 280 if (ip->ip_p == IPPROTO_TCP) { 281 (void)printf("%s.%s > %s.%s: ", 282 ipaddr_string(&ip->ip_src), 283 tcpport_string(sport), 284 ipaddr_string(&ip->ip_dst), 285 tcpport_string(dport)); 286 } else { 287 (void)printf("%s > %s: ", 288 tcpport_string(sport), tcpport_string(dport)); 289 } 290 } |
291
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274 if (hlen < sizeof(*tp)) {
275 (void)printf(" tcp %d [bad hdr length %u - too short, < %lu]",
276 length - hlen, hlen, (unsigned long)sizeof(*tp));
277 return;
278 }
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292 if (hlen < sizeof(*tp)) { 293 (void)printf(" tcp %d [bad hdr length %u - too short, < %lu]", 294 length - hlen, hlen, (unsigned long)sizeof(*tp)); 295 return; 296 } |
297
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280 TCHECK(*tp);
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298 TCHECK(*tp); |
299
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282 seq = EXTRACT_32BITS(&tp->th_seq);
283 ack = EXTRACT_32BITS(&tp->th_ack);
284 win = EXTRACT_16BITS(&tp->th_win);
285 urp = EXTRACT_16BITS(&tp->th_urp);
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300 seq = EXTRACT_32BITS(&tp->th_seq); 301 ack = EXTRACT_32BITS(&tp->th_ack); 302 win = EXTRACT_16BITS(&tp->th_win); 303 urp = EXTRACT_16BITS(&tp->th_urp); |
304
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287 if (qflag) {
288 (void)printf("tcp %d", length - hlen);
289 if (hlen > length) {
290 (void)printf(" [bad hdr length %u - too long, > %u]",
291 hlen, length);
292 }
293 return;
294 }
295 if ((flags = tp->th_flags) & (TH_SYN|TH_FIN|TH_RST|TH_PUSH|
296 TH_ECNECHO|TH_CWR)) {
297 if (flags & TH_SYN)
298 putchar('S');
299 if (flags & TH_FIN)
300 putchar('F');
301 if (flags & TH_RST)
302 putchar('R');
303 if (flags & TH_PUSH)
304 putchar('P');
305 if (flags & TH_CWR)
306 putchar('W'); /* congestion _W_indow reduced (ECN) */
307 if (flags & TH_ECNECHO)
308 putchar('E'); /* ecn _E_cho sent (ECN) */
309 } else
310 putchar('.');
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305 if (qflag) { 306 (void)printf("tcp %d", length - hlen); 307 if (hlen > length) { 308 (void)printf(" [bad hdr length %u - too long, > %u]", 309 hlen, length); 310 } 311 return; 312 } |
313
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312 if (!Sflag && (flags & TH_ACK)) {
313 register struct tcp_seq_hash *th;
314 const void *src, *dst;
315 register int rev;
316 struct tha tha;
317 /*
318 * Find (or record) the initial sequence numbers for
319 * this conversation. (we pick an arbitrary
320 * collating order so there's only one entry for
321 * both directions).
322 */
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314 flags = tp->th_flags; 315 printf("Flags [%s]", bittok2str_nosep(tcp_flag_values, "none", flags)); 316 317 if (!Sflag && (flags & TH_ACK)) { 318 register struct tcp_seq_hash *th; 319 const void *src, *dst; 320 register int rev; 321 struct tha tha; 322 /* 323 * Find (or record) the initial sequence numbers for 324 * this conversation. (we pick an arbitrary 325 * collating order so there's only one entry for 326 * both directions). 327 */ |
328#ifdef INET6
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324 memset(&tha, 0, sizeof(tha));
325 rev = 0;
326 if (ip6) {
327 src = &ip6->ip6_src;
328 dst = &ip6->ip6_dst;
329 if (sport > dport)
330 rev = 1;
331 else if (sport == dport) {
332 if (memcmp(src, dst, sizeof ip6->ip6_dst) > 0)
333 rev = 1;
334 }
335 if (rev) {
336 memcpy(&tha.src, dst, sizeof ip6->ip6_dst);
337 memcpy(&tha.dst, src, sizeof ip6->ip6_src);
338 tha.port = dport << 16 | sport;
339 } else {
340 memcpy(&tha.dst, dst, sizeof ip6->ip6_dst);
341 memcpy(&tha.src, src, sizeof ip6->ip6_src);
342 tha.port = sport << 16 | dport;
343 }
344 } else {
345 src = &ip->ip_src;
346 dst = &ip->ip_dst;
347 if (sport > dport)
348 rev = 1;
349 else if (sport == dport) {
350 if (memcmp(src, dst, sizeof ip->ip_dst) > 0)
351 rev = 1;
352 }
353 if (rev) {
354 memcpy(&tha.src, dst, sizeof ip->ip_dst);
355 memcpy(&tha.dst, src, sizeof ip->ip_src);
356 tha.port = dport << 16 | sport;
357 } else {
358 memcpy(&tha.dst, dst, sizeof ip->ip_dst);
359 memcpy(&tha.src, src, sizeof ip->ip_src);
360 tha.port = sport << 16 | dport;
361 }
362 }
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329 memset(&tha, 0, sizeof(tha)); 330 rev = 0; 331 if (ip6) { 332 src = &ip6->ip6_src; 333 dst = &ip6->ip6_dst; 334 if (sport > dport) 335 rev = 1; 336 else if (sport == dport) { 337 if (memcmp(src, dst, sizeof ip6->ip6_dst) > 0) 338 rev = 1; 339 } 340 if (rev) { 341 memcpy(&tha.src, dst, sizeof ip6->ip6_dst); 342 memcpy(&tha.dst, src, sizeof ip6->ip6_src); 343 tha.port = dport << 16 | sport; 344 } else { 345 memcpy(&tha.dst, dst, sizeof ip6->ip6_dst); 346 memcpy(&tha.src, src, sizeof ip6->ip6_src); 347 tha.port = sport << 16 | dport; 348 } 349 } else { 350 src = &ip->ip_src; 351 dst = &ip->ip_dst; 352 if (sport > dport) 353 rev = 1; 354 else if (sport == dport) { 355 if (memcmp(src, dst, sizeof ip->ip_dst) > 0) 356 rev = 1; 357 } 358 if (rev) { 359 memcpy(&tha.src, dst, sizeof ip->ip_dst); 360 memcpy(&tha.dst, src, sizeof ip->ip_src); 361 tha.port = dport << 16 | sport; 362 } else { 363 memcpy(&tha.dst, dst, sizeof ip->ip_dst); 364 memcpy(&tha.src, src, sizeof ip->ip_src); 365 tha.port = sport << 16 | dport; 366 } 367 } |
368#else
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364 rev = 0;
365 src = &ip->ip_src;
366 dst = &ip->ip_dst;
367 if (sport > dport)
368 rev = 1;
369 else if (sport == dport) {
370 if (memcmp(src, dst, sizeof ip->ip_dst) > 0)
371 rev = 1;
372 }
373 if (rev) {
374 memcpy(&tha.src, dst, sizeof ip->ip_dst);
375 memcpy(&tha.dst, src, sizeof ip->ip_src);
376 tha.port = dport << 16 | sport;
377 } else {
378 memcpy(&tha.dst, dst, sizeof ip->ip_dst);
379 memcpy(&tha.src, src, sizeof ip->ip_src);
380 tha.port = sport << 16 | dport;
381 }
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369 rev = 0; 370 src = &ip->ip_src; 371 dst = &ip->ip_dst; 372 if (sport > dport) 373 rev = 1; 374 else if (sport == dport) { 375 if (memcmp(src, dst, sizeof ip->ip_dst) > 0) 376 rev = 1; 377 } 378 if (rev) { 379 memcpy(&tha.src, dst, sizeof ip->ip_dst); 380 memcpy(&tha.dst, src, sizeof ip->ip_src); 381 tha.port = dport << 16 | sport; 382 } else { 383 memcpy(&tha.dst, dst, sizeof ip->ip_dst); 384 memcpy(&tha.src, src, sizeof ip->ip_src); 385 tha.port = sport << 16 | dport; 386 } |
387#endif 388
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384 threv = rev;
385 for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
386 th->nxt; th = th->nxt)
387 if (memcmp((char *)&tha, (char *)&th->addr,
388 sizeof(th->addr)) == 0)
389 break;
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389 threv = rev; 390 for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE]; 391 th->nxt; th = th->nxt) 392 if (memcmp((char *)&tha, (char *)&th->addr, 393 sizeof(th->addr)) == 0) 394 break; |
395
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391 if (!th->nxt || (flags & TH_SYN)) {
392 /* didn't find it or new conversation */
393 if (th->nxt == NULL) {
394 th->nxt = (struct tcp_seq_hash *)
395 calloc(1, sizeof(*th));
396 if (th->nxt == NULL)
397 error("tcp_print: calloc");
398 }
399 th->addr = tha;
400 if (rev)
401 th->ack = seq, th->seq = ack - 1;
402 else
403 th->seq = seq, th->ack = ack - 1;
404 } else {
405 if (rev)
406 seq -= th->ack, ack -= th->seq;
407 else
408 seq -= th->seq, ack -= th->ack;
409 }
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396 if (!th->nxt || (flags & TH_SYN)) { 397 /* didn't find it or new conversation */ 398 if (th->nxt == NULL) { 399 th->nxt = (struct tcp_seq_hash *) 400 calloc(1, sizeof(*th)); 401 if (th->nxt == NULL) 402 error("tcp_print: calloc"); 403 } 404 th->addr = tha; 405 if (rev) 406 th->ack = seq, th->seq = ack - 1; 407 else 408 th->seq = seq, th->ack = ack - 1; 409 } else { 410 if (rev) 411 seq -= th->ack, ack -= th->seq; 412 else 413 seq -= th->seq, ack -= th->ack; 414 } |
415
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411 thseq = th->seq;
412 thack = th->ack;
413 } else {
414 /*fool gcc*/
415 thseq = thack = threv = 0;
416 }
417 if (hlen > length) {
418 (void)printf(" [bad hdr length %u - too long, > %u]",
419 hlen, length);
420 return;
421 }
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416 thseq = th->seq; 417 thack = th->ack; 418 } else { 419 /*fool gcc*/ 420 thseq = thack = threv = 0; 421 } 422 if (hlen > length) { 423 (void)printf(" [bad hdr length %u - too long, > %u]", 424 hlen, length); 425 return; 426 } |
427
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423 if (IP_V(ip) == 4 && vflag && !fragmented) {
424 u_int16_t sum, tcp_sum;
425 if (TTEST2(tp->th_sport, length)) {
426 sum = tcp_cksum(ip, tp, length);
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428 if (IP_V(ip) == 4 && vflag && !Kflag && !fragmented) { 429 u_int16_t sum, tcp_sum; 430 if (TTEST2(tp->th_sport, length)) { 431 sum = tcp_cksum(ip, tp, length); |
432 433 (void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum));
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429 if (sum != 0) {
430 tcp_sum = EXTRACT_16BITS(&tp->th_sum);
431 (void)printf(" (incorrect (-> 0x%04x),",in_cksum_shouldbe(tcp_sum, sum));
432 } else
433 (void)printf(" (correct),");
434 }
435 }
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434 if (sum != 0) { 435 tcp_sum = EXTRACT_16BITS(&tp->th_sum); 436 (void)printf(" (incorrect -> 0x%04x)",in_cksum_shouldbe(tcp_sum, sum)); 437 } else 438 (void)printf(" (correct)"); 439 } 440 } |
441#ifdef INET6
|
437 if (IP_V(ip) == 6 && ip6->ip6_plen && vflag && !fragmented) {
438 u_int16_t sum,tcp_sum;
439 if (TTEST2(tp->th_sport, length)) {
440 sum = tcp6_cksum(ip6, tp, length);
|
442 if (IP_V(ip) == 6 && ip6->ip6_plen && vflag && !Kflag && !fragmented) { 443 u_int16_t sum,tcp_sum; 444 if (TTEST2(tp->th_sport, length)) { 445 sum = tcp6_cksum(ip6, tp, length); |
446 (void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum));
|
442 if (sum != 0) {
443 tcp_sum = EXTRACT_16BITS(&tp->th_sum);
444 (void)printf(" (incorrect (-> 0x%04x),",in_cksum_shouldbe(tcp_sum, sum));
445 } else
446 (void)printf(" (correct),");
|
447 if (sum != 0) { 448 tcp_sum = EXTRACT_16BITS(&tp->th_sum); 449 (void)printf(" (incorrect -> 0x%04x)",in_cksum_shouldbe(tcp_sum, sum)); 450 } else 451 (void)printf(" (correct)"); |
452
|
448 }
449 }
|
453 } 454 } |
455#endif 456
|
452 length -= hlen;
453 if (vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST))
454 (void)printf(" %u:%u(%u)", seq, seq + length, length);
455 if (flags & TH_ACK)
456 (void)printf(" ack %u", ack);
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457 length -= hlen; 458 if (vflag > 1 || flags & (TH_SYN | TH_FIN | TH_RST)) { 459 (void)printf(", seq %u", seq); |
460
|
458 (void)printf(" win %d", win);
|
461 if (length > 0) { 462 (void)printf(":%u", seq + length); 463 } 464 } |
465
|
460 if (flags & TH_URG)
461 (void)printf(" urg %d", urp);
462 /*
463 * Handle any options.
464 */
465 if (hlen > sizeof(*tp)) {
466 register const u_char *cp;
467 register u_int i, opt, datalen;
468 register u_int len;
|
466 if (flags & TH_ACK) { 467 (void)printf(", ack %u", ack); 468 } |
469
|
470 hlen -= sizeof(*tp);
471 cp = (const u_char *)tp + sizeof(*tp);
472 putchar(' ');
473 ch = '<';
474 while (hlen > 0) {
475 putchar(ch);
476 TCHECK(*cp);
477 opt = *cp++;
478 if (ZEROLENOPT(opt))
479 len = 1;
480 else {
481 TCHECK(*cp);
482 len = *cp++; /* total including type, len */
483 if (len < 2 || len > hlen)
484 goto bad;
485 --hlen; /* account for length byte */
486 }
487 --hlen; /* account for type byte */
488 datalen = 0;
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470 (void)printf(", win %d", win); |
471
|
472 if (flags & TH_URG) 473 (void)printf(", urg %d", urp); 474 /* 475 * Handle any options. 476 */ 477 if (hlen > sizeof(*tp)) { 478 register const u_char *cp; 479 register u_int i, opt, datalen; 480 register u_int len; 481 482 hlen -= sizeof(*tp); 483 cp = (const u_char *)tp + sizeof(*tp); 484 printf(", options ["); 485 while (hlen > 0) { 486 if (ch != '\0') 487 putchar(ch); 488 TCHECK(*cp); 489 opt = *cp++; 490 if (ZEROLENOPT(opt)) 491 len = 1; 492 else { 493 TCHECK(*cp); 494 len = *cp++; /* total including type, len */ 495 if (len < 2 || len > hlen) 496 goto bad; 497 --hlen; /* account for length byte */ 498 } 499 --hlen; /* account for type byte */ 500 datalen = 0; 501 |
502/* Bail if "l" bytes of data are not left or were not captured */ 503#define LENCHECK(l) { if ((l) > hlen) goto bad; TCHECK2(*cp, l); } 504
|
493 switch (opt) {
|
505
|
495 case TCPOPT_MAXSEG:
496 (void)printf("mss");
497 datalen = 2;
498 LENCHECK(datalen);
499 (void)printf(" %u", EXTRACT_16BITS(cp));
|
506 printf("%s", tok2str(tcp_option_values, "Unknown Option %u", opt)); |
507
|
501 break;
|
508 switch (opt) { |
509
|
503 case TCPOPT_EOL:
504 (void)printf("eol");
505 break;
|
510 case TCPOPT_MAXSEG: 511 datalen = 2; 512 LENCHECK(datalen); 513 (void)printf(" %u", EXTRACT_16BITS(cp)); 514 break; |
515
|
507 case TCPOPT_NOP:
508 (void)printf("nop");
509 break;
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516 case TCPOPT_WSCALE: 517 datalen = 1; 518 LENCHECK(datalen); 519 (void)printf(" %u", *cp); 520 break; |
521
|
511 case TCPOPT_WSCALE:
512 (void)printf("wscale");
513 datalen = 1;
514 LENCHECK(datalen);
515 (void)printf(" %u", *cp);
516 break;
|
522 case TCPOPT_SACK: 523 datalen = len - 2; 524 if (datalen % 8 != 0) { 525 (void)printf("malformed sack"); 526 } else { 527 u_int32_t s, e; |
528
|
518 case TCPOPT_SACKOK:
519 (void)printf("sackOK");
520 break;
|
529 (void)printf(" %d ", datalen / 8); 530 for (i = 0; i < datalen; i += 8) { 531 LENCHECK(i + 4); 532 s = EXTRACT_32BITS(cp + i); 533 LENCHECK(i + 8); 534 e = EXTRACT_32BITS(cp + i + 4); 535 if (threv) { 536 s -= thseq; 537 e -= thseq; 538 } else { 539 s -= thack; 540 e -= thack; 541 } 542 (void)printf("{%u:%u}", s, e); 543 } 544 } 545 break; |
546
|
522 case TCPOPT_SACK:
523 datalen = len - 2;
524 if (datalen % 8 != 0) {
525 (void)printf("malformed sack");
526 } else {
527 u_int32_t s, e;
|
547 case TCPOPT_CC: 548 case TCPOPT_CCNEW: 549 case TCPOPT_CCECHO: 550 case TCPOPT_ECHO: 551 case TCPOPT_ECHOREPLY: |
552
|
529 (void)printf("sack %d ", datalen / 8);
530 for (i = 0; i < datalen; i += 8) {
531 LENCHECK(i + 4);
532 s = EXTRACT_32BITS(cp + i);
533 LENCHECK(i + 8);
534 e = EXTRACT_32BITS(cp + i + 4);
535 if (threv) {
536 s -= thseq;
537 e -= thseq;
538 } else {
539 s -= thack;
540 e -= thack;
541 }
542 (void)printf("{%u:%u}", s, e);
543 }
544 }
545 break;
|
553 /* 554 * those options share their semantics. 555 * fall through 556 */ 557 datalen = 4; 558 LENCHECK(datalen); 559 (void)printf(" %u", EXTRACT_32BITS(cp)); 560 break; |
561
|
547 case TCPOPT_ECHO:
548 (void)printf("echo");
549 datalen = 4;
550 LENCHECK(datalen);
551 (void)printf(" %u", EXTRACT_32BITS(cp));
552 break;
|
562 case TCPOPT_TIMESTAMP: 563 datalen = 8; 564 LENCHECK(datalen); 565 (void)printf(" val %u ecr %u", 566 EXTRACT_32BITS(cp), 567 EXTRACT_32BITS(cp + 4)); 568 break; |
569
|
554 case TCPOPT_ECHOREPLY:
555 (void)printf("echoreply");
556 datalen = 4;
557 LENCHECK(datalen);
558 (void)printf(" %u", EXTRACT_32BITS(cp));
559 break;
|
570 case TCPOPT_SIGNATURE: 571 datalen = TCP_SIGLEN; 572 LENCHECK(datalen); 573#ifdef HAVE_LIBCRYPTO 574 switch (tcp_verify_signature(ip, tp, 575 bp + TH_OFF(tp) * 4, length, cp)) { |
576
|
561 case TCPOPT_TIMESTAMP:
562 (void)printf("timestamp");
563 datalen = 8;
564 LENCHECK(4);
565 (void)printf(" %u", EXTRACT_32BITS(cp));
566 LENCHECK(datalen);
567 (void)printf(" %u", EXTRACT_32BITS(cp + 4));
568 break;
|
577 case SIGNATURE_VALID: 578 (void)printf("valid"); 579 break; |
580
|
570 case TCPOPT_CC:
571 (void)printf("cc");
572 datalen = 4;
573 LENCHECK(datalen);
574 (void)printf(" %u", EXTRACT_32BITS(cp));
575 break;
|
581 case SIGNATURE_INVALID: 582 (void)printf("invalid"); 583 break; |
584
|
577 case TCPOPT_CCNEW:
578 (void)printf("ccnew");
579 datalen = 4;
580 LENCHECK(datalen);
581 (void)printf(" %u", EXTRACT_32BITS(cp));
582 break;
|
585 case CANT_CHECK_SIGNATURE: 586 (void)printf("can't check - "); 587 for (i = 0; i < TCP_SIGLEN; ++i) 588 (void)printf("%02x", cp[i]); 589 break; 590 } 591#else 592 for (i = 0; i < TCP_SIGLEN; ++i) 593 (void)printf("%02x", cp[i]); 594#endif 595 break; |
596
|
584 case TCPOPT_CCECHO:
585 (void)printf("ccecho");
586 datalen = 4;
587 LENCHECK(datalen);
588 (void)printf(" %u", EXTRACT_32BITS(cp));
589 break;
|
597 case TCPOPT_AUTH: 598 (void)printf("keyid %d", *cp++); 599 datalen = len - 3; 600 for (i = 0; i < datalen; ++i) { 601 LENCHECK(i); 602 (void)printf("%02x", cp[i]); 603 } 604 break; |
605
|
591 case TCPOPT_SIGNATURE:
592 (void)printf("md5:");
593 datalen = TCP_SIGLEN;
594 LENCHECK(datalen);
595#ifdef HAVE_LIBCRYPTO
596 switch (tcp_verify_signature(ip, tp,
597 bp + TH_OFF(tp) * 4, length, cp)) {
|
606
|
599 case SIGNATURE_VALID:
600 (void)printf("valid");
601 break;
|
607 case TCPOPT_EOL: 608 case TCPOPT_NOP: 609 case TCPOPT_SACKOK: 610 /* 611 * Nothing interesting. 612 * fall through 613 */ 614 break; |
615
|
603 case SIGNATURE_INVALID:
604 (void)printf("invalid");
605 break;
|
616 default: 617 datalen = len - 2; 618 for (i = 0; i < datalen; ++i) { 619 LENCHECK(i); 620 (void)printf("%02x", cp[i]); 621 } 622 break; 623 } |
624
|
607 case CANT_CHECK_SIGNATURE:
608 (void)printf("can't check - ");
609 for (i = 0; i < TCP_SIGLEN; ++i)
610 (void)printf("%02x", cp[i]);
611 break;
612 }
613#else
614 for (i = 0; i < TCP_SIGLEN; ++i)
615 (void)printf("%02x", cp[i]);
616#endif
617 break;
|
625 /* Account for data printed */ 626 cp += datalen; 627 hlen -= datalen; |
628
|
619 default:
620 (void)printf("opt-%u:", opt);
621 datalen = len - 2;
622 for (i = 0; i < datalen; ++i) {
623 LENCHECK(i);
624 (void)printf("%02x", cp[i]);
625 }
626 break;
627 }
|
629 /* Check specification against observed length */ 630 ++datalen; /* option octet */ 631 if (!ZEROLENOPT(opt)) 632 ++datalen; /* size octet */ 633 if (datalen != len) 634 (void)printf("[len %d]", len); 635 ch = ','; 636 if (opt == TCPOPT_EOL) 637 break; 638 } 639 putchar(']'); 640 } |
641
|
629 /* Account for data printed */
630 cp += datalen;
631 hlen -= datalen;
|
642 /* 643 * Print length field before crawling down the stack. 644 */ 645 printf(", length %u", length); |
646
|
633 /* Check specification against observed length */
634 ++datalen; /* option octet */
635 if (!ZEROLENOPT(opt))
636 ++datalen; /* size octet */
637 if (datalen != len)
638 (void)printf("[len %d]", len);
639 ch = ',';
640 if (opt == TCPOPT_EOL)
641 break;
642 }
643 putchar('>');
644 }
|
647 if (length <= 0) 648 return; |
649
|
646 if (length <= 0)
647 return;
|
650 /* 651 * Decode payload if necessary. 652 */ 653 bp += TH_OFF(tp) * 4; 654 if ((flags & TH_RST) && vflag) { 655 print_tcp_rst_data(bp, length); 656 return; 657 } |
658
|
649 /*
650 * Decode payload if necessary.
651 */
652 bp += TH_OFF(tp) * 4;
653 if (flags & TH_RST) {
654 if (vflag)
655 print_tcp_rst_data(bp, length);
656 } else {
657 if (sport == TELNET_PORT || dport == TELNET_PORT) {
658 if (!qflag && vflag)
659 telnet_print(bp, length);
660 } else if (sport == BGP_PORT || dport == BGP_PORT)
661 bgp_print(bp, length);
662 else if (sport == PPTP_PORT || dport == PPTP_PORT)
663 pptp_print(bp);
|
659 if (sport == TELNET_PORT || dport == TELNET_PORT) { 660 if (!qflag && vflag) 661 telnet_print(bp, length); 662 } else if (sport == BGP_PORT || dport == BGP_PORT) 663 bgp_print(bp, length); 664 else if (sport == PPTP_PORT || dport == PPTP_PORT) 665 pptp_print(bp); |
666#ifdef TCPDUMP_DO_SMB
|
665 else if (sport == NETBIOS_SSN_PORT || dport == NETBIOS_SSN_PORT)
666 nbt_tcp_print(bp, length);
|
667 else if (sport == NETBIOS_SSN_PORT || dport == NETBIOS_SSN_PORT) 668 nbt_tcp_print(bp, length); 669 else if (sport == SMB_PORT || dport == SMB_PORT) 670 smb_tcp_print(bp, length); |
671#endif
|
668 else if (sport == BEEP_PORT || dport == BEEP_PORT)
669 beep_print(bp, length);
670 else if (length > 2 &&
671 (sport == NAMESERVER_PORT || dport == NAMESERVER_PORT ||
672 sport == MULTICASTDNS_PORT || dport == MULTICASTDNS_PORT)) {
673 /*
674 * TCP DNS query has 2byte length at the head.
675 * XXX packet could be unaligned, it can go strange
676 */
677 ns_print(bp + 2, length - 2, 0);
678 } else if (sport == MSDP_PORT || dport == MSDP_PORT) {
679 msdp_print(bp, length);
680 }
681 else if (length > 0 && (sport == LDP_PORT || dport == LDP_PORT)) {
682 ldp_print(bp, length);
683 }
684 }
685 return;
686bad:
687 fputs("[bad opt]", stdout);
688 if (ch != '\0')
689 putchar('>');
690 return;
691trunc:
692 fputs("[|tcp]", stdout);
693 if (ch != '\0')
694 putchar('>');
|
672 else if (sport == BEEP_PORT || dport == BEEP_PORT) 673 beep_print(bp, length); 674 else if (length > 2 && 675 (sport == NAMESERVER_PORT || dport == NAMESERVER_PORT || 676 sport == MULTICASTDNS_PORT || dport == MULTICASTDNS_PORT)) { 677 /* 678 * TCP DNS query has 2byte length at the head. 679 * XXX packet could be unaligned, it can go strange 680 */ 681 ns_print(bp + 2, length - 2, 0); 682 } else if (sport == MSDP_PORT || dport == MSDP_PORT) { 683 msdp_print(bp, length); 684 } 685 else if (length > 0 && (sport == LDP_PORT || dport == LDP_PORT)) { 686 ldp_print(bp, length); 687 } 688 689 return; 690 bad: 691 fputs("[bad opt]", stdout); 692 if (ch != '\0') 693 putchar('>'); 694 return; 695 trunc: 696 fputs("[|tcp]", stdout); 697 if (ch != '\0') 698 putchar('>'); |
699} 700 701/* 702 * RFC1122 says the following on data in RST segments: 703 * 704 * 4.2.2.12 RST Segment: RFC-793 Section 3.4 705 * 706 * A TCP SHOULD allow a received RST segment to include data. 707 * 708 * DISCUSSION 709 * It has been suggested that a RST segment could contain 710 * ASCII text that encoded and explained the cause of the 711 * RST. No standard has yet been established for such 712 * data. 713 * 714 */ 715 716static void 717print_tcp_rst_data(register const u_char *sp, u_int length) 718{
|
715 int c;
|
719 int c; |
720
|
717 if (TTEST2(*sp, length))
718 printf(" [RST");
719 else
720 printf(" [!RST");
721 if (length > MAX_RST_DATA_LEN) {
722 length = MAX_RST_DATA_LEN; /* can use -X for longer */
723 putchar('+'); /* indicate we truncate */
724 }
725 putchar(' ');
726 while (length-- && sp <= snapend) {
727 c = *sp++;
728 safeputchar(c);
729 }
730 putchar(']');
|
721 if (TTEST2(*sp, length)) 722 printf(" [RST"); 723 else 724 printf(" [!RST"); 725 if (length > MAX_RST_DATA_LEN) { 726 length = MAX_RST_DATA_LEN; /* can use -X for longer */ 727 putchar('+'); /* indicate we truncate */ 728 } 729 putchar(' '); 730 while (length-- && sp <= snapend) { 731 c = *sp++; 732 safeputchar(c); 733 } 734 putchar(']'); |
735} 736 737#ifdef HAVE_LIBCRYPTO 738static int 739tcp_verify_signature(const struct ip *ip, const struct tcphdr *tp,
|
736 const u_char *data, int length, const u_char *rcvsig)
|
740 const u_char *data, int length, const u_char *rcvsig) |
741{ 742 struct tcphdr tp1;
|
739 u_char sig[TCP_SIGLEN];
740 char zero_proto = 0;
741 MD5_CTX ctx;
742 u_int16_t savecsum, tlen;
|
743 u_char sig[TCP_SIGLEN]; 744 char zero_proto = 0; 745 MD5_CTX ctx; 746 u_int16_t savecsum, tlen; |
747#ifdef INET6
|
744 struct ip6_hdr *ip6;
|
748 struct ip6_hdr *ip6; 749 u_int32_t len32; 750 u_int8_t nxt; |
751#endif
|
746 u_int32_t len32;
747 u_int8_t nxt;
|
752
|
749 tp1 = *tp;
|
753 tp1 = *tp; |
754
|
751 if (tcpmd5secret == NULL)
752 return (CANT_CHECK_SIGNATURE);
|
755 if (tcpmd5secret == NULL) 756 return (CANT_CHECK_SIGNATURE); |
757
|
754 MD5_Init(&ctx);
755 /*
756 * Step 1: Update MD5 hash with IP pseudo-header.
757 */
758 if (IP_V(ip) == 4) {
759 MD5_Update(&ctx, (char *)&ip->ip_src, sizeof(ip->ip_src));
760 MD5_Update(&ctx, (char *)&ip->ip_dst, sizeof(ip->ip_dst));
761 MD5_Update(&ctx, (char *)&zero_proto, sizeof(zero_proto));
762 MD5_Update(&ctx, (char *)&ip->ip_p, sizeof(ip->ip_p));
763 tlen = EXTRACT_16BITS(&ip->ip_len) - IP_HL(ip) * 4;
764 tlen = htons(tlen);
765 MD5_Update(&ctx, (char *)&tlen, sizeof(tlen));
|
758 MD5_Init(&ctx); 759 /* 760 * Step 1: Update MD5 hash with IP pseudo-header. 761 */ 762 if (IP_V(ip) == 4) { 763 MD5_Update(&ctx, (char *)&ip->ip_src, sizeof(ip->ip_src)); 764 MD5_Update(&ctx, (char *)&ip->ip_dst, sizeof(ip->ip_dst)); 765 MD5_Update(&ctx, (char *)&zero_proto, sizeof(zero_proto)); 766 MD5_Update(&ctx, (char *)&ip->ip_p, sizeof(ip->ip_p)); 767 tlen = EXTRACT_16BITS(&ip->ip_len) - IP_HL(ip) * 4; 768 tlen = htons(tlen); 769 MD5_Update(&ctx, (char *)&tlen, sizeof(tlen)); |
770#ifdef INET6
|
767 } else if (IP_V(ip) == 6) {
768 ip6 = (struct ip6_hdr *)ip;
769 MD5_Update(&ctx, (char *)&ip6->ip6_src, sizeof(ip6->ip6_src));
770 MD5_Update(&ctx, (char *)&ip6->ip6_dst, sizeof(ip6->ip6_dst));
771 len32 = htonl(ntohs(ip6->ip6_plen));
772 MD5_Update(&ctx, (char *)&len32, sizeof(len32));
773 nxt = 0;
774 MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
775 MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
776 MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
777 nxt = IPPROTO_TCP;
778 MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
|
771 } else if (IP_V(ip) == 6) { 772 ip6 = (struct ip6_hdr *)ip; 773 MD5_Update(&ctx, (char *)&ip6->ip6_src, sizeof(ip6->ip6_src)); 774 MD5_Update(&ctx, (char *)&ip6->ip6_dst, sizeof(ip6->ip6_dst)); 775 len32 = htonl(ntohs(ip6->ip6_plen)); 776 MD5_Update(&ctx, (char *)&len32, sizeof(len32)); 777 nxt = 0; 778 MD5_Update(&ctx, (char *)&nxt, sizeof(nxt)); 779 MD5_Update(&ctx, (char *)&nxt, sizeof(nxt)); 780 MD5_Update(&ctx, (char *)&nxt, sizeof(nxt)); 781 nxt = IPPROTO_TCP; 782 MD5_Update(&ctx, (char *)&nxt, sizeof(nxt)); |
783#endif
|
780 } else
781 return (CANT_CHECK_SIGNATURE);
|
784 } else 785 return (CANT_CHECK_SIGNATURE); |
786
|
783 /*
784 * Step 2: Update MD5 hash with TCP header, excluding options.
785 * The TCP checksum must be set to zero.
786 */
787 savecsum = tp1.th_sum;
788 tp1.th_sum = 0;
789 MD5_Update(&ctx, (char *)&tp1, sizeof(struct tcphdr));
790 tp1.th_sum = savecsum;
791 /*
792 * Step 3: Update MD5 hash with TCP segment data, if present.
793 */
794 if (length > 0)
795 MD5_Update(&ctx, data, length);
796 /*
797 * Step 4: Update MD5 hash with shared secret.
798 */
799 MD5_Update(&ctx, tcpmd5secret, strlen(tcpmd5secret));
800 MD5_Final(sig, &ctx);
|
787 /* 788 * Step 2: Update MD5 hash with TCP header, excluding options. 789 * The TCP checksum must be set to zero. 790 */ 791 savecsum = tp1.th_sum; 792 tp1.th_sum = 0; 793 MD5_Update(&ctx, (char *)&tp1, sizeof(struct tcphdr)); 794 tp1.th_sum = savecsum; 795 /* 796 * Step 3: Update MD5 hash with TCP segment data, if present. 797 */ 798 if (length > 0) 799 MD5_Update(&ctx, data, length); 800 /* 801 * Step 4: Update MD5 hash with shared secret. 802 */ 803 MD5_Update(&ctx, tcpmd5secret, strlen(tcpmd5secret)); 804 MD5_Final(sig, &ctx); |
805
|
802 if (memcmp(rcvsig, sig, TCP_SIGLEN) == 0)
803 return (SIGNATURE_VALID);
804 else
805 return (SIGNATURE_INVALID);
|
806 if (memcmp(rcvsig, sig, TCP_SIGLEN) == 0) 807 return (SIGNATURE_VALID); 808 else 809 return (SIGNATURE_INVALID); |
810} 811#endif /* HAVE_LIBCRYPTO */
|
812 813/* 814 * Local Variables: 815 * c-style: whitesmith 816 * c-basic-offset: 8 817 * End: 818 */ |
|