print-tcp.c (172684) | print-tcp.c (190207) |
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1/* $NetBSD: print-tcp.c,v 1.9 2007/07/26 18:15:12 plunky Exp $ */ 2 |
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1/* 2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Copyright (c) 1999-2004 The tcpdump.org project 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions --- 9 unchanged lines hidden (view full) --- 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#ifndef lint 25static const char rcsid[] _U_ = | 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 --- 9 unchanged lines hidden (view full) --- 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_ = |
26 "@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.120.2.3 2005/10/16 06:05:46 guy Exp $ (LBL)"; | 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 $"); |
27#endif 28 29#ifdef HAVE_CONFIG_H 30#include "config.h" 31#endif 32 33#include <tcpdump-stdinc.h> 34 --- 20 unchanged lines hidden (view full) --- 55#ifdef HAVE_LIBCRYPTO 56#include <openssl/md5.h> 57 58#define SIGNATURE_VALID 0 59#define SIGNATURE_INVALID 1 60#define CANT_CHECK_SIGNATURE 2 61 62static int tcp_verify_signature(const struct ip *ip, const struct tcphdr *tp, | 31#endif 32 33#ifdef HAVE_CONFIG_H 34#include "config.h" 35#endif 36 37#include <tcpdump-stdinc.h> 38 --- 20 unchanged lines hidden (view full) --- 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, |
63 const u_char *data, int length, const u_char *rcvsig); | 67 const u_char *data, int length, const u_char *rcvsig); |
64#endif 65 66static void print_tcp_rst_data(register const u_char *sp, u_int length); 67 68#define MAX_RST_DATA_LEN 30 69 70 71struct tha { 72#ifndef INET6 | 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 |
73 struct in_addr src; 74 struct in_addr dst; | 77 struct in_addr src; 78 struct in_addr dst; |
75#else | 79#else |
76 struct in6_addr src; 77 struct in6_addr dst; | 80 struct in6_addr src; 81 struct in6_addr dst; |
78#endif /*INET6*/ | 82#endif /*INET6*/ |
79 u_int port; | 83 u_int port; |
80}; 81 82struct tcp_seq_hash { | 84}; 85 86struct tcp_seq_hash { |
83 struct tcp_seq_hash *nxt; 84 struct tha addr; 85 tcp_seq seq; 86 tcp_seq ack; | 87 struct tcp_seq_hash *nxt; 88 struct tha addr; 89 tcp_seq seq; 90 tcp_seq ack; |
87}; 88 89#define TSEQ_HASHSIZE 919 90 91/* These tcp optinos do not have the size octet */ 92#define ZEROLENOPT(o) ((o) == TCPOPT_EOL || (o) == TCPOPT_NOP) 93 94static struct tcp_seq_hash tcp_seq_hash[TSEQ_HASHSIZE]; 95 | 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 |
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}; |
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96 | 111 |
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 | 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}; |
113 114static int tcp_cksum(register const struct ip *ip, 115 register const struct tcphdr *tp, 116 register u_int len) 117{ | 129 130static int tcp_cksum(register const struct ip *ip, 131 register const struct tcphdr *tp, 132 register u_int len) 133{ |
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; | 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; |
129 | 145 |
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); | 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); |
139 | 155 |
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]); | 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]); |
143} 144 145#ifdef INET6 146static int tcp6_cksum(const struct ip6_hdr *ip6, const struct tcphdr *tp, | 159} 160 161#ifdef INET6 162static int tcp6_cksum(const struct ip6_hdr *ip6, const struct tcphdr *tp, |
147 u_int len) | 163 u_int len) |
148{ | 164{ |
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; | 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; |
162 | 177 |
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; | 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; |
169 | 184 |
170 sum = 0; 171 for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++) 172 sum += phu.pa[i]; | 185 for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++) 186 sum += phu.pa[i]; |
173 | 187 |
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); | 188 return in_cksum((u_short *)tp, len, sum); |
187} 188#endif 189 190void 191tcp_print(register const u_char *bp, register u_int length, 192 register const u_char *bp2, int fragmented) 193{ | 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{ |
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; | 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; |
202#ifdef INET6 | 204#ifdef INET6 |
203 register const struct ip6_hdr *ip6; | 205 register const struct ip6_hdr *ip6; |
204#endif 205 | 206#endif 207 |
206 tp = (struct tcphdr *)bp; 207 ip = (struct ip *)bp2; | 208 tp = (struct tcphdr *)bp; 209 ip = (struct ip *)bp2; |
208#ifdef INET6 | 210#ifdef INET6 |
209 if (IP_V(ip) == 6) 210 ip6 = (struct ip6_hdr *)bp2; 211 else 212 ip6 = NULL; | 211 if (IP_V(ip) == 6) 212 ip6 = (struct ip6_hdr *)bp2; 213 else 214 ip6 = NULL; |
213#endif /*INET6*/ | 215#endif /*INET6*/ |
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 } | 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 } |
221 | 223 |
222 sport = EXTRACT_16BITS(&tp->th_sport); 223 dport = EXTRACT_16BITS(&tp->th_dport); | 224 sport = EXTRACT_16BITS(&tp->th_sport); 225 dport = EXTRACT_16BITS(&tp->th_dport); |
224 | 226 |
225 hlen = TH_OFF(tp) * 4; | 227 hlen = TH_OFF(tp) * 4; |
226 | 228 |
227 /* | 229 /* |
228 * If data present, header length valid, and NFS port used, 229 * assume NFS. 230 * Pass offset of data plus 4 bytes for RPC TCP msg length 231 * to NFS print routines. 232 */ | 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 */ |
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 } | 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 } |
247#ifdef INET6 | 265#ifdef INET6 |
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 | 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 |
260#endif /*INET6*/ | 278#endif /*INET6*/ |
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 } | 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 } |
273 | 291 |
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 } | 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 } |
279 | 297 |
280 TCHECK(*tp); | 298 TCHECK(*tp); |
281 | 299 |
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); | 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); |
286 | 304 |
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('.'); | 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 } |
311 | 313 |
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 */ | 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 */ |
323#ifdef INET6 | 328#ifdef INET6 |
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 } | 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 } |
363#else | 368#else |
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 } | 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 } |
382#endif 383 | 387#endif 388 |
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; | 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; |
390 | 395 |
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 } | 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 } |
410 | 415 |
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 } | 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 } |
422 | 427 |
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); | 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); |
427 428 (void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum)); | 432 433 (void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum)); |
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 } | 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 } |
436#ifdef INET6 | 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); |
441 (void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum)); | 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)"); |
447 | 452 |
448 } 449 } | 453 } 454 } |
450#endif 451 | 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); | 457 length -= hlen; 458 if (vflag > 1 || flags & (TH_SYN | TH_FIN | TH_RST)) { 459 (void)printf(", seq %u", seq); |
457 | 460 |
458 (void)printf(" win %d", win); | 461 if (length > 0) { 462 (void)printf(":%u", seq + length); 463 } 464 } |
459 | 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 | 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; | 470 (void)printf(", win %d", win); |
489 | 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 |
|
490/* Bail if "l" bytes of data are not left or were not captured */ 491#define LENCHECK(l) { if ((l) > hlen) goto bad; TCHECK2(*cp, l); } 492 | 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) { | |
494 | 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)); |
500 | 507 |
501 break; | 508 switch (opt) { |
502 | 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; |
506 | 515 |
507 case TCPOPT_NOP: 508 (void)printf("nop"); 509 break; | 516 case TCPOPT_WSCALE: 517 datalen = 1; 518 LENCHECK(datalen); 519 (void)printf(" %u", *cp); 520 break; |
510 | 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; |
517 | 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; |
521 | 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: |
528 | 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; |
546 | 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; |
553 | 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)) { |
560 | 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; |
569 | 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; |
576 | 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; |
583 | 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; |
590 | 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)) { | |
598 | 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; |
602 | 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 } |
606 | 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; |
618 | 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 } |
628 | 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); |
632 | 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; |
645 | 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 } |
648 | 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); |
664#ifdef TCPDUMP_DO_SMB | 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); |
667#endif | 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('>'); |
695} 696 697/* 698 * RFC1122 says the following on data in RST segments: 699 * 700 * 4.2.2.12 RST Segment: RFC-793 Section 3.4 701 * 702 * A TCP SHOULD allow a received RST segment to include data. --- 4 unchanged lines hidden (view full) --- 707 * RST. No standard has yet been established for such 708 * data. 709 * 710 */ 711 712static void 713print_tcp_rst_data(register const u_char *sp, u_int length) 714{ | 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. --- 4 unchanged lines hidden (view full) --- 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; |
716 | 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(']'); |
731} 732 733#ifdef HAVE_LIBCRYPTO 734static int 735tcp_verify_signature(const struct ip *ip, const struct tcphdr *tp, | 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) |
737{ 738 struct tcphdr tp1; | 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; |
743#ifdef INET6 | 747#ifdef INET6 |
744 struct ip6_hdr *ip6; | 748 struct ip6_hdr *ip6; 749 u_int32_t len32; 750 u_int8_t nxt; |
745#endif | 751#endif |
746 u_int32_t len32; 747 u_int8_t nxt; | |
748 | 752 |
749 tp1 = *tp; | 753 tp1 = *tp; |
750 | 754 |
751 if (tcpmd5secret == NULL) 752 return (CANT_CHECK_SIGNATURE); | 755 if (tcpmd5secret == NULL) 756 return (CANT_CHECK_SIGNATURE); |
753 | 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)); |
766#ifdef INET6 | 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)); |
779#endif | 783#endif |
780 } else 781 return (CANT_CHECK_SIGNATURE); | 784 } else 785 return (CANT_CHECK_SIGNATURE); |
782 | 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); |
801 | 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); |
806} 807#endif /* HAVE_LIBCRYPTO */ | 810} 811#endif /* HAVE_LIBCRYPTO */ |
812 813/* 814 * Local Variables: 815 * c-style: whitesmith 816 * c-basic-offset: 8 817 * End: 818 */ |
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