X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/8f002a3cccc30aca8feb4dab323d3ebba68d95cc..refs/heads/tcpdump-4.1:/print-tcp.c diff --git a/print-tcp.c b/print-tcp.c index 852300ce..e2559ecf 100644 --- a/print-tcp.c +++ b/print-tcp.c @@ -1,7 +1,11 @@ +/* $NetBSD: print-tcp.c,v 1.9 2007/07/26 18:15:12 plunky Exp $ */ + /* * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 * The Regents of the University of California. All rights reserved. * + * Copyright (c) 1999-2004 The tcpdump.org project + * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) @@ -20,26 +24,21 @@ */ #ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.80 2000-11-17 19:08:16 itojun Exp $ (LBL)"; +static const char rcsid[] _U_ = +"@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.135 2008-11-09 23:35:03 mcr Exp $ (LBL)"; +#else +__RCSID("$NetBSD: print-tcp.c,v 1.8 2007/07/24 11:53:48 drochner Exp $"); #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif -#include -#include - -#include - -#include +#include #include #include #include -#include -#include #include "interface.h" #include "addrtoname.h" @@ -51,67 +50,41 @@ static const char rcsid[] = #ifdef INET6 #include "ip6.h" #endif +#include "ipproto.h" +#include "rpc_auth.h" +#include "rpc_msg.h" -static void print_tcp_rst_data(register const u_char *sp, u_int length); +#include "nameser.h" -#define MAX_RST_DATA_LEN 30 +#ifdef HAVE_LIBCRYPTO +#include +#include -/* Compatibility */ -#ifndef TCPOPT_WSCALE -#define TCPOPT_WSCALE 3 /* window scale factor (rfc1072) */ -#endif -#ifndef TCPOPT_SACKOK -#define TCPOPT_SACKOK 4 /* selective ack ok (rfc1072) */ -#endif -#ifndef TCPOPT_SACK -#define TCPOPT_SACK 5 /* selective ack (rfc1072) */ -#endif -#ifndef TCPOPT_ECHO -#define TCPOPT_ECHO 6 /* echo (rfc1072) */ -#endif -#ifndef TCPOPT_ECHOREPLY -#define TCPOPT_ECHOREPLY 7 /* echo (rfc1072) */ -#endif -#ifndef TCPOPT_TIMESTAMP -#define TCPOPT_TIMESTAMP 8 /* timestamps (rfc1323) */ -#endif -#ifndef TCPOPT_CC -#define TCPOPT_CC 11 /* T/TCP CC options (rfc1644) */ -#endif -#ifndef TCPOPT_CCNEW -#define TCPOPT_CCNEW 12 /* T/TCP CC options (rfc1644) */ -#endif -#ifndef TCPOPT_CCECHO -#define TCPOPT_CCECHO 13 /* T/TCP CC options (rfc1644) */ +static int tcp_verify_signature(const struct ip *ip, const struct tcphdr *tp, + const u_char *data, int length, const u_char *rcvsig); #endif -/* - * Definitions required for ECN - * for use if the OS running tcpdump does not have ECN - */ -#ifndef TH_ECNECHO -#define TH_ECNECHO 0x40 /* ECN Echo in tcp header */ -#endif -#ifndef TH_CWR -#define TH_CWR 0x80 /* ECN Cwnd Reduced in tcp header*/ -#endif +static void print_tcp_rst_data(register const u_char *sp, u_int length); + +#define MAX_RST_DATA_LEN 30 + struct tha { #ifndef INET6 - struct in_addr src; - struct in_addr dst; + struct in_addr src; + struct in_addr dst; #else - struct in6_addr src; - struct in6_addr dst; + struct in6_addr src; + struct in6_addr dst; #endif /*INET6*/ - u_int port; + u_int port; }; struct tcp_seq_hash { - struct tcp_seq_hash *nxt; - struct tha addr; - tcp_seq seq; - tcp_seq ack; + struct tcp_seq_hash *nxt; + struct tha addr; + tcp_seq seq; + tcp_seq ack; }; #define TSEQ_HASHSIZE 919 @@ -121,549 +94,588 @@ struct tcp_seq_hash { static struct tcp_seq_hash tcp_seq_hash[TSEQ_HASHSIZE]; +struct tok tcp_flag_values[] = { + { TH_FIN, "F" }, + { TH_SYN, "S" }, + { TH_RST, "R" }, + { TH_PUSH, "P" }, + { TH_ACK, "." }, + { TH_URG, "U" }, + { TH_ECNECHO, "E" }, + { TH_CWR, "W" }, + { 0, NULL } +}; -#ifndef TELNET_PORT -#define TELNET_PORT 23 -#endif -#ifndef BGP_PORT -#define BGP_PORT 179 -#endif -#define NETBIOS_SSN_PORT 139 -#define BXXP_PORT 10288 -#ifndef NFS_PORT -#define NFS_PORT 2049 -#endif +struct tok tcp_option_values[] = { + { TCPOPT_EOL, "eol" }, + { TCPOPT_NOP, "nop" }, + { TCPOPT_MAXSEG, "mss" }, + { TCPOPT_WSCALE, "wscale" }, + { TCPOPT_SACKOK, "sackOK" }, + { TCPOPT_SACK, "sack" }, + { TCPOPT_ECHO, "echo" }, + { TCPOPT_ECHOREPLY, "echoreply" }, + { TCPOPT_TIMESTAMP, "TS" }, + { TCPOPT_CC, "cc" }, + { TCPOPT_CCNEW, "ccnew" }, + { TCPOPT_CCECHO, "" }, + { TCPOPT_SIGNATURE, "md5" }, + { TCPOPT_AUTH, "enhanced auth" }, + { TCPOPT_UTO, "uto" }, + { 0, NULL } +}; static int tcp_cksum(register const struct ip *ip, register const struct tcphdr *tp, - register int len) + register u_int len) { - int i, tlen; - union phu { - struct phdr { - u_int32_t src; - u_int32_t dst; - u_char mbz; - u_char proto; - u_int16_t len; - } ph; - u_int16_t pa[6]; - } phu; - register const u_int16_t *sp; - u_int32_t sum; - tlen = ntohs(ip->ip_len) - ((const char *)tp-(const char*)ip); - - /* pseudo-header.. */ - phu.ph.len = htons(tlen); - phu.ph.mbz = 0; - phu.ph.proto = IPPROTO_TCP; - memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t)); - memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t)); - - sp = &phu.pa[0]; - sum = sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]; - - sp = (const u_int16_t *)tp; - - for (i=0; i<(tlen&~1); i+= 2) - sum += *sp++; - - if (tlen & 1) { - sum += htons( (*(const char *)sp) << 8); - } - - while (sum > 0xffff) - sum = (sum & 0xffff) + (sum >> 16); - sum = ~sum & 0xffff; - - return (sum); + union phu { + struct phdr { + u_int32_t src; + u_int32_t dst; + u_char mbz; + u_char proto; + u_int16_t len; + } ph; + u_int16_t pa[6]; + } phu; + const u_int16_t *sp; + + /* pseudo-header.. */ + phu.ph.len = htons((u_int16_t)len); + phu.ph.mbz = 0; + phu.ph.proto = IPPROTO_TCP; + memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t)); + if (IP_HL(ip) == 5) + memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t)); + else + phu.ph.dst = ip_finddst(ip); + + sp = &phu.pa[0]; + return in_cksum((u_short *)tp, len, + sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]); } -#ifdef INET6 -static int tcp6_cksum(const struct ip6_hdr *ip6, const struct tcphdr *tp, - int len) -{ - int i, tlen; - register const u_int16_t *sp; - u_int32_t sum; - union { - struct { - struct in6_addr ph_src; - struct in6_addr ph_dst; - u_int32_t ph_len; - u_int8_t ph_zero[3]; - u_int8_t ph_nxt; - } ph; - u_int16_t pa[20]; - } phu; - - tlen = ntohs(ip6->ip6_plen) + sizeof(struct ip6_hdr) - - ((const char *)tp - (const char*)ip6); - - /* pseudo-header */ - memset(&phu, 0, sizeof(phu)); - phu.ph.ph_src = ip6->ip6_src; - phu.ph.ph_dst = ip6->ip6_dst; - phu.ph.ph_len = htonl(tlen); - phu.ph.ph_nxt = IPPROTO_TCP; - - sum = 0; - for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++) - sum += phu.pa[i]; - - sp = (const u_int16_t *)tp; - - for (i = 0; i < (tlen & ~1); i += 2) - sum += *sp++; - - if (tlen & 1) - sum += htons((*(const char *)sp) << 8); - - while (sum > 0xffff) - sum = (sum & 0xffff) + (sum >> 16); - sum = ~sum & 0xffff; - - return (sum); -} -#endif - void tcp_print(register const u_char *bp, register u_int length, register const u_char *bp2, int fragmented) { - register const struct tcphdr *tp; - register const struct ip *ip; - register u_char flags; - register int hlen; - register char ch; - u_int16_t sport, dport, win, urp; - u_int32_t seq, ack, thseq, thack; - int threv; + register const struct tcphdr *tp; + register const struct ip *ip; + register u_char flags; + register u_int hlen; + register char ch; + u_int16_t sport, dport, win, urp; + u_int32_t seq, ack, thseq, thack; + u_int utoval; + int threv; #ifdef INET6 - register const struct ip6_hdr *ip6; + register const struct ip6_hdr *ip6; #endif - tp = (struct tcphdr *)bp; - ip = (struct ip *)bp2; + tp = (struct tcphdr *)bp; + ip = (struct ip *)bp2; #ifdef INET6 - if (IP_V(ip) == 6) - ip6 = (struct ip6_hdr *)bp2; - else - ip6 = NULL; + if (IP_V(ip) == 6) + ip6 = (struct ip6_hdr *)bp2; + else + ip6 = NULL; #endif /*INET6*/ - ch = '\0'; - if (!TTEST(tp->th_dport)) { - (void)printf("%s > %s: [|tcp]", - ipaddr_string(&ip->ip_src), - ipaddr_string(&ip->ip_dst)); - return; - } - - sport = ntohs(tp->th_sport); - dport = ntohs(tp->th_dport); - - - hlen = TH_OFF(tp) * 4; - - /* - * If data present and NFS port used, assume NFS. + ch = '\0'; + if (!TTEST(tp->th_dport)) { + (void)printf("%s > %s: [|tcp]", + ipaddr_string(&ip->ip_src), + ipaddr_string(&ip->ip_dst)); + return; + } + + sport = EXTRACT_16BITS(&tp->th_sport); + dport = EXTRACT_16BITS(&tp->th_dport); + + hlen = TH_OFF(tp) * 4; + + /* + * If data present, header length valid, and NFS port used, + * assume NFS. * Pass offset of data plus 4 bytes for RPC TCP msg length * to NFS print routines. */ - if (!qflag) { - if ((u_char *)tp + 4 + sizeof(struct rpc_msg) <= snapend && - dport == NFS_PORT) { - nfsreq_print((u_char *)tp + hlen + 4, length-hlen, - (u_char *)ip); - return; - } else if ((u_char *)tp + 4 + sizeof(struct rpc_msg) - <= snapend && - sport == NFS_PORT) { - nfsreply_print((u_char *)tp + hlen + 4,length-hlen, - (u_char *)ip); - return; - } - } + if (!qflag && hlen >= sizeof(*tp) && hlen <= length && + (length - hlen) >= 4) { + u_char *fraglenp; + u_int32_t fraglen; + register struct sunrpc_msg *rp; + enum sunrpc_msg_type direction; + + fraglenp = (u_char *)tp + hlen; + if (TTEST2(*fraglenp, 4)) { + fraglen = EXTRACT_32BITS(fraglenp) & 0x7FFFFFFF; + if (fraglen > (length - hlen) - 4) + fraglen = (length - hlen) - 4; + rp = (struct sunrpc_msg *)(fraglenp + 4); + if (TTEST(rp->rm_direction)) { + direction = (enum sunrpc_msg_type)EXTRACT_32BITS(&rp->rm_direction); + if (dport == NFS_PORT && + direction == SUNRPC_CALL) { + nfsreq_print((u_char *)rp, fraglen, + (u_char *)ip); + return; + } + if (sport == NFS_PORT && + direction == SUNRPC_REPLY) { + nfsreply_print((u_char *)rp, fraglen, + (u_char *)ip); + return; + } + } + } + } #ifdef INET6 - if (ip6) { - if (ip6->ip6_nxt == IPPROTO_TCP) { - (void)printf("%s.%s > %s.%s: ", - ip6addr_string(&ip6->ip6_src), - tcpport_string(sport), - ip6addr_string(&ip6->ip6_dst), - tcpport_string(dport)); - } else { - (void)printf("%s > %s: ", - tcpport_string(sport), tcpport_string(dport)); - } - } else + if (ip6) { + if (ip6->ip6_nxt == IPPROTO_TCP) { + (void)printf("%s.%s > %s.%s: ", + ip6addr_string(&ip6->ip6_src), + tcpport_string(sport), + ip6addr_string(&ip6->ip6_dst), + tcpport_string(dport)); + } else { + (void)printf("%s > %s: ", + tcpport_string(sport), tcpport_string(dport)); + } + } else #endif /*INET6*/ - { - if (ip->ip_p == IPPROTO_TCP) { - (void)printf("%s.%s > %s.%s: ", - ipaddr_string(&ip->ip_src), - tcpport_string(sport), - ipaddr_string(&ip->ip_dst), - tcpport_string(dport)); - } else { - (void)printf("%s > %s: ", - tcpport_string(sport), tcpport_string(dport)); - } - } - - TCHECK(*tp); - - seq = (u_int32_t)ntohl(tp->th_seq); - ack = (u_int32_t)ntohl(tp->th_ack); - win = ntohs(tp->th_win); - urp = ntohs(tp->th_urp); - - if (qflag) { - (void)printf("tcp %d", length - TH_OFF(tp) * 4); - return; - } - if ((flags = tp->th_flags) & (TH_SYN|TH_FIN|TH_RST|TH_PUSH| - TH_ECNECHO|TH_CWR)) { - if (flags & TH_SYN) - putchar('S'); - if (flags & TH_FIN) - putchar('F'); - if (flags & TH_RST) - putchar('R'); - if (flags & TH_PUSH) - putchar('P'); - if (flags & TH_CWR) - putchar('W'); /* congestion _W_indow reduced (ECN) */ - if (flags & TH_ECNECHO) - putchar('E'); /* ecn _E_cho sent (ECN) */ - } else - putchar('.'); - - if (!Sflag && (flags & TH_ACK)) { - register struct tcp_seq_hash *th; - register int rev; - struct tha tha; - /* - * Find (or record) the initial sequence numbers for - * this conversation. (we pick an arbitrary - * collating order so there's only one entry for - * both directions). - */ + { + if (ip->ip_p == IPPROTO_TCP) { + (void)printf("%s.%s > %s.%s: ", + ipaddr_string(&ip->ip_src), + tcpport_string(sport), + ipaddr_string(&ip->ip_dst), + tcpport_string(dport)); + } else { + (void)printf("%s > %s: ", + tcpport_string(sport), tcpport_string(dport)); + } + } + + if (hlen < sizeof(*tp)) { + (void)printf(" tcp %d [bad hdr length %u - too short, < %lu]", + length - hlen, hlen, (unsigned long)sizeof(*tp)); + return; + } + + TCHECK(*tp); + + seq = EXTRACT_32BITS(&tp->th_seq); + ack = EXTRACT_32BITS(&tp->th_ack); + win = EXTRACT_16BITS(&tp->th_win); + urp = EXTRACT_16BITS(&tp->th_urp); + + if (qflag) { + (void)printf("tcp %d", length - hlen); + if (hlen > length) { + (void)printf(" [bad hdr length %u - too long, > %u]", + hlen, length); + } + return; + } + + flags = tp->th_flags; + printf("Flags [%s]", bittok2str_nosep(tcp_flag_values, "none", flags)); + + if (!Sflag && (flags & TH_ACK)) { + register struct tcp_seq_hash *th; + const void *src, *dst; + register int rev; + struct tha tha; + /* + * Find (or record) the initial sequence numbers for + * this conversation. (we pick an arbitrary + * collating order so there's only one entry for + * both directions). + */ #ifdef INET6 - memset(&tha, 0, sizeof(tha)); - rev = 0; - if (ip6) { - if (sport > dport) { - rev = 1; - } else if (sport == dport) { - int i; - - for (i = 0; i < 4; i++) { - if (((u_int32_t *)(&ip6->ip6_src))[i] > - ((u_int32_t *)(&ip6->ip6_dst))[i]) { - rev = 1; - break; - } - } - } - if (rev) { - tha.src = ip6->ip6_dst; - tha.dst = ip6->ip6_src; - tha.port = dport << 16 | sport; - } else { - tha.dst = ip6->ip6_dst; - tha.src = ip6->ip6_src; - tha.port = sport << 16 | dport; - } - } else { - if (sport > dport || - (sport == dport && - ip->ip_src.s_addr > ip->ip_dst.s_addr)) { - rev = 1; - } - if (rev) { - *(struct in_addr *)&tha.src = ip->ip_dst; - *(struct in_addr *)&tha.dst = ip->ip_src; - tha.port = dport << 16 | sport; - } else { - *(struct in_addr *)&tha.dst = ip->ip_dst; - *(struct in_addr *)&tha.src = ip->ip_src; - tha.port = sport << 16 | dport; - } - } + memset(&tha, 0, sizeof(tha)); + rev = 0; + if (ip6) { + src = &ip6->ip6_src; + dst = &ip6->ip6_dst; + if (sport > dport) + rev = 1; + else if (sport == dport) { + if (memcmp(src, dst, sizeof ip6->ip6_dst) > 0) + rev = 1; + } + if (rev) { + memcpy(&tha.src, dst, sizeof ip6->ip6_dst); + memcpy(&tha.dst, src, sizeof ip6->ip6_src); + tha.port = dport << 16 | sport; + } else { + memcpy(&tha.dst, dst, sizeof ip6->ip6_dst); + memcpy(&tha.src, src, sizeof ip6->ip6_src); + tha.port = sport << 16 | dport; + } + } else { + src = &ip->ip_src; + dst = &ip->ip_dst; + if (sport > dport) + rev = 1; + else if (sport == dport) { + if (memcmp(src, dst, sizeof ip->ip_dst) > 0) + rev = 1; + } + if (rev) { + memcpy(&tha.src, dst, sizeof ip->ip_dst); + memcpy(&tha.dst, src, sizeof ip->ip_src); + tha.port = dport << 16 | sport; + } else { + memcpy(&tha.dst, dst, sizeof ip->ip_dst); + memcpy(&tha.src, src, sizeof ip->ip_src); + tha.port = sport << 16 | dport; + } + } #else - if (sport < dport || - (sport == dport && - ip->ip_src.s_addr < ip->ip_dst.s_addr)) { - tha.src = ip->ip_src, tha.dst = ip->ip_dst; - tha.port = sport << 16 | dport; - rev = 0; - } else { - tha.src = ip->ip_dst, tha.dst = ip->ip_src; - tha.port = dport << 16 | sport; - rev = 1; - } + rev = 0; + src = &ip->ip_src; + dst = &ip->ip_dst; + if (sport > dport) + rev = 1; + else if (sport == dport) { + if (memcmp(src, dst, sizeof ip->ip_dst) > 0) + rev = 1; + } + if (rev) { + memcpy(&tha.src, dst, sizeof ip->ip_dst); + memcpy(&tha.dst, src, sizeof ip->ip_src); + tha.port = dport << 16 | sport; + } else { + memcpy(&tha.dst, dst, sizeof ip->ip_dst); + memcpy(&tha.src, src, sizeof ip->ip_src); + tha.port = sport << 16 | dport; + } #endif - threv = rev; - for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE]; - th->nxt; th = th->nxt) - if (!memcmp((char *)&tha, (char *)&th->addr, - sizeof(th->addr))) - break; - - if (!th->nxt || (flags & TH_SYN)) { - /* didn't find it or new conversation */ - if (th->nxt == NULL) { - th->nxt = (struct tcp_seq_hash *) - calloc(1, sizeof(*th)); - if (th->nxt == NULL) - error("tcp_print: calloc"); - } - th->addr = tha; - if (rev) - th->ack = seq, th->seq = ack - 1; - else - th->seq = seq, th->ack = ack - 1; - - } else { - if (rev) - seq -= th->ack, ack -= th->seq; - else - seq -= th->seq, ack -= th->ack; - } - - thseq = th->seq; - thack = th->ack; - } else { - /*fool gcc*/ - thseq = thack = threv = 0; - } - if (hlen > length) { - (void)printf(" [bad hdr length]"); - return; - } - - if (IP_V(ip) == 4 && vflag && !fragmented) { - int sum; - if (TTEST2(tp->th_sport, length)) { - sum = tcp_cksum(ip, tp, length); - if (sum != 0) - (void)printf(" [bad tcp cksum %x!]", sum); - else - (void)printf(" [tcp sum ok]"); - } - } + threv = rev; + for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE]; + th->nxt; th = th->nxt) + if (memcmp((char *)&tha, (char *)&th->addr, + sizeof(th->addr)) == 0) + break; + + if (!th->nxt || (flags & TH_SYN)) { + /* didn't find it or new conversation */ + if (th->nxt == NULL) { + th->nxt = (struct tcp_seq_hash *) + calloc(1, sizeof(*th)); + if (th->nxt == NULL) + error("tcp_print: calloc"); + } + th->addr = tha; + if (rev) + th->ack = seq, th->seq = ack - 1; + else + th->seq = seq, th->ack = ack - 1; + } else { + if (rev) + seq -= th->ack, ack -= th->seq; + else + seq -= th->seq, ack -= th->ack; + } + + thseq = th->seq; + thack = th->ack; + } else { + /*fool gcc*/ + thseq = thack = threv = 0; + } + if (hlen > length) { + (void)printf(" [bad hdr length %u - too long, > %u]", + hlen, length); + return; + } + + if (IP_V(ip) == 4 && vflag && !Kflag && !fragmented) { + u_int16_t sum, tcp_sum; + if (TTEST2(tp->th_sport, length)) { + sum = tcp_cksum(ip, tp, length); + + (void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum)); + if (sum != 0) { + tcp_sum = EXTRACT_16BITS(&tp->th_sum); + (void)printf(" (incorrect -> 0x%04x)",in_cksum_shouldbe(tcp_sum, sum)); + } else + (void)printf(" (correct)"); + } + } #ifdef INET6 - if (IP_V(ip) == 6 && ip6->ip6_plen && vflag && !fragmented) { - int sum; - if (TTEST2(tp->th_sport, length)) { - sum = tcp6_cksum(ip6, tp, length); - if (sum != 0) - (void)printf(" [bad tcp cksum %x!]", sum); - else - (void)printf(" [tcp sum ok]"); - } - } + if (IP_V(ip) == 6 && ip6->ip6_plen && vflag && !Kflag && !fragmented) { + u_int16_t sum,tcp_sum; + if (TTEST2(tp->th_sport, length)) { + sum = nextproto6_cksum(ip6, (u_short *)tp, length, IPPROTO_TCP); + (void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum)); + if (sum != 0) { + tcp_sum = EXTRACT_16BITS(&tp->th_sum); + (void)printf(" (incorrect -> 0x%04x)",in_cksum_shouldbe(tcp_sum, sum)); + } else + (void)printf(" (correct)"); + + } + } #endif - length -= hlen; - if (vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST)) - (void)printf(" %u:%u(%d)", seq, seq + length, length); - if (flags & TH_ACK) - (void)printf(" ack %u", ack); - - (void)printf(" win %d", win); - - if (flags & TH_URG) - (void)printf(" urg %d", urp); - /* - * Handle any options. - */ - if ((hlen -= sizeof(*tp)) > 0) { - register const u_char *cp; - register int i, opt, len, datalen; - - cp = (const u_char *)tp + sizeof(*tp); - putchar(' '); - ch = '<'; - while (hlen > 0) { - putchar(ch); - TCHECK(*cp); - opt = *cp++; - if (ZEROLENOPT(opt)) - len = 1; - else { - TCHECK(*cp); - len = *cp++; /* total including type, len */ - if (len < 2 || len > hlen) - goto bad; - --hlen; /* account for length byte */ - } - --hlen; /* account for type byte */ - datalen = 0; + length -= hlen; + if (vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST)) { + (void)printf(", seq %u", seq); + + if (length > 0) { + (void)printf(":%u", seq + length); + } + } + + if (flags & TH_ACK) { + (void)printf(", ack %u", ack); + } + + (void)printf(", win %d", win); + + if (flags & TH_URG) + (void)printf(", urg %d", urp); + /* + * Handle any options. + */ + if (hlen > sizeof(*tp)) { + register const u_char *cp; + register u_int i, opt, datalen; + register u_int len; + + hlen -= sizeof(*tp); + cp = (const u_char *)tp + sizeof(*tp); + printf(", options ["); + while (hlen > 0) { + if (ch != '\0') + putchar(ch); + TCHECK(*cp); + opt = *cp++; + if (ZEROLENOPT(opt)) + len = 1; + else { + TCHECK(*cp); + len = *cp++; /* total including type, len */ + if (len < 2 || len > hlen) + goto bad; + --hlen; /* account for length byte */ + } + --hlen; /* account for type byte */ + datalen = 0; /* Bail if "l" bytes of data are not left or were not captured */ #define LENCHECK(l) { if ((l) > hlen) goto bad; TCHECK2(*cp, l); } - switch (opt) { - - case TCPOPT_MAXSEG: - (void)printf("mss"); - datalen = 2; - LENCHECK(datalen); - (void)printf(" %u", EXTRACT_16BITS(cp)); - - break; - - case TCPOPT_EOL: - (void)printf("eol"); - break; - - case TCPOPT_NOP: - (void)printf("nop"); - break; - - case TCPOPT_WSCALE: - (void)printf("wscale"); - datalen = 1; - LENCHECK(datalen); - (void)printf(" %u", *cp); - break; - - case TCPOPT_SACKOK: - (void)printf("sackOK"); - break; - - case TCPOPT_SACK: - (void)printf("sack"); - datalen = len - 2; - if (datalen % 8 != 0) { - (void)printf(" malformed sack "); - } else { - u_int32_t s, e; - - (void)printf(" sack %d ", datalen / 8); - for (i = 0; i < datalen; i += 8) { - LENCHECK(i + 4); - s = EXTRACT_32BITS(cp + i); - LENCHECK(i + 8); - e = EXTRACT_32BITS(cp + i + 4); - if (threv) { - s -= thseq; - e -= thseq; - } else { - s -= thack; - e -= thack; - } - (void)printf("{%u:%u}", s, e); - } - (void)printf(" "); - } - break; - - case TCPOPT_ECHO: - (void)printf("echo"); - datalen = 4; - LENCHECK(datalen); - (void)printf(" %u", EXTRACT_32BITS(cp)); - break; - - case TCPOPT_ECHOREPLY: - (void)printf("echoreply"); - datalen = 4; - LENCHECK(datalen); - (void)printf(" %u", EXTRACT_32BITS(cp)); - break; - - case TCPOPT_TIMESTAMP: - (void)printf("timestamp"); - datalen = 8; - LENCHECK(4); - (void)printf(" %u", EXTRACT_32BITS(cp)); - LENCHECK(datalen); - (void)printf(" %u", EXTRACT_32BITS(cp + 4)); - break; - - case TCPOPT_CC: - (void)printf("cc"); - datalen = 4; - LENCHECK(datalen); - (void)printf(" %u", EXTRACT_32BITS(cp)); - break; - - case TCPOPT_CCNEW: - (void)printf("ccnew"); - datalen = 4; - LENCHECK(datalen); - (void)printf(" %u", EXTRACT_32BITS(cp)); - break; - - case TCPOPT_CCECHO: - (void)printf("ccecho"); - datalen = 4; - LENCHECK(datalen); - (void)printf(" %u", EXTRACT_32BITS(cp)); - break; - - default: - (void)printf("opt-%d:", opt); - datalen = len - 2; - for (i = 0; i < datalen; ++i) { - LENCHECK(i); - (void)printf("%02x", cp[i]); - } - break; - } - - /* Account for data printed */ - cp += datalen; - hlen -= datalen; - - /* Check specification against observed length */ - ++datalen; /* option octet */ - if (!ZEROLENOPT(opt)) - ++datalen; /* size octet */ - if (datalen != len) - (void)printf("[len %d]", len); - ch = ','; - if (opt == TCPOPT_EOL) - break; - } - putchar('>'); - } - - if (length <= 0) - return; - /* - * Decode payload if necessary. - */ - bp += TH_OFF(tp) * 4; - if (flags & TH_RST) { - if (vflag) - print_tcp_rst_data(bp, length); - } else { - if (sport == TELNET_PORT || dport == TELNET_PORT) { - if (!qflag && vflag) - telnet_print(bp, length); - } else if (sport == BGP_PORT || dport == BGP_PORT) - bgp_print(bp, length); - else if (sport == NETBIOS_SSN_PORT || dport == NETBIOS_SSN_PORT) - nbt_tcp_print(bp, length); - else if (sport == BXXP_PORT || dport == BXXP_PORT) - bxxp_print(bp, length); - } - return; -bad: - fputs("[bad opt]", stdout); - if (ch != '\0') - putchar('>'); - return; -trunc: - fputs("[|tcp]", stdout); - if (ch != '\0') - putchar('>'); + printf("%s", tok2str(tcp_option_values, "Unknown Option %u", opt)); + + switch (opt) { + + case TCPOPT_MAXSEG: + datalen = 2; + LENCHECK(datalen); + (void)printf(" %u", EXTRACT_16BITS(cp)); + break; + + case TCPOPT_WSCALE: + datalen = 1; + LENCHECK(datalen); + (void)printf(" %u", *cp); + break; + + case TCPOPT_SACK: + datalen = len - 2; + if (datalen % 8 != 0) { + (void)printf("malformed sack"); + } else { + u_int32_t s, e; + + (void)printf(" %d ", datalen / 8); + for (i = 0; i < datalen; i += 8) { + LENCHECK(i + 4); + s = EXTRACT_32BITS(cp + i); + LENCHECK(i + 8); + e = EXTRACT_32BITS(cp + i + 4); + if (threv) { + s -= thseq; + e -= thseq; + } else { + s -= thack; + e -= thack; + } + (void)printf("{%u:%u}", s, e); + } + } + break; + + case TCPOPT_CC: + case TCPOPT_CCNEW: + case TCPOPT_CCECHO: + case TCPOPT_ECHO: + case TCPOPT_ECHOREPLY: + + /* + * those options share their semantics. + * fall through + */ + datalen = 4; + LENCHECK(datalen); + (void)printf(" %u", EXTRACT_32BITS(cp)); + break; + + case TCPOPT_TIMESTAMP: + datalen = 8; + LENCHECK(datalen); + (void)printf(" val %u ecr %u", + EXTRACT_32BITS(cp), + EXTRACT_32BITS(cp + 4)); + break; + + case TCPOPT_SIGNATURE: + datalen = TCP_SIGLEN; + LENCHECK(datalen); +#ifdef HAVE_LIBCRYPTO + switch (tcp_verify_signature(ip, tp, + bp + TH_OFF(tp) * 4, length, cp)) { + + case SIGNATURE_VALID: + (void)printf("valid"); + break; + + case SIGNATURE_INVALID: + (void)printf("invalid"); + break; + + case CANT_CHECK_SIGNATURE: + (void)printf("can't check - "); + for (i = 0; i < TCP_SIGLEN; ++i) + (void)printf("%02x", cp[i]); + break; + } +#else + for (i = 0; i < TCP_SIGLEN; ++i) + (void)printf("%02x", cp[i]); +#endif + break; + + case TCPOPT_AUTH: + (void)printf("keyid %d", *cp++); + datalen = len - 3; + for (i = 0; i < datalen; ++i) { + LENCHECK(i); + (void)printf("%02x", cp[i]); + } + break; + + + case TCPOPT_EOL: + case TCPOPT_NOP: + case TCPOPT_SACKOK: + /* + * Nothing interesting. + * fall through + */ + break; + + case TCPOPT_UTO: + datalen = 2; + LENCHECK(datalen); + utoval = EXTRACT_16BITS(cp); + (void)printf("0x%x", utoval); + if (utoval & 0x0001) + utoval = (utoval >> 1) * 60; + else + utoval >>= 1; + (void)printf(" %u", utoval); + break; + + default: + datalen = len - 2; + for (i = 0; i < datalen; ++i) { + LENCHECK(i); + (void)printf("%02x", cp[i]); + } + break; + } + + /* Account for data printed */ + cp += datalen; + hlen -= datalen; + + /* Check specification against observed length */ + ++datalen; /* option octet */ + if (!ZEROLENOPT(opt)) + ++datalen; /* size octet */ + if (datalen != len) + (void)printf("[len %d]", len); + ch = ','; + if (opt == TCPOPT_EOL) + break; + } + putchar(']'); + } + + /* + * Print length field before crawling down the stack. + */ + printf(", length %u", length); + + if (length <= 0) + return; + + /* + * Decode payload if necessary. + */ + bp += TH_OFF(tp) * 4; + if ((flags & TH_RST) && vflag) { + print_tcp_rst_data(bp, length); + return; + } + + if (sport == TELNET_PORT || dport == TELNET_PORT) { + if (!qflag && vflag) + telnet_print(bp, length); + } else if (sport == BGP_PORT || dport == BGP_PORT) + bgp_print(bp, length); + else if (sport == PPTP_PORT || dport == PPTP_PORT) + pptp_print(bp); +#ifdef TCPDUMP_DO_SMB + else if (sport == NETBIOS_SSN_PORT || dport == NETBIOS_SSN_PORT) + nbt_tcp_print(bp, length); + else if (sport == SMB_PORT || dport == SMB_PORT) + smb_tcp_print(bp, length); +#endif + else if (sport == BEEP_PORT || dport == BEEP_PORT) + beep_print(bp, length); + else if (length > 2 && + (sport == NAMESERVER_PORT || dport == NAMESERVER_PORT || + sport == MULTICASTDNS_PORT || dport == MULTICASTDNS_PORT)) { + /* + * TCP DNS query has 2byte length at the head. + * XXX packet could be unaligned, it can go strange + */ + ns_print(bp + 2, length - 2, 0); + } else if (sport == MSDP_PORT || dport == MSDP_PORT) { + msdp_print(bp, length); + } + else if (length > 0 && (sport == LDP_PORT || dport == LDP_PORT)) { + ldp_print(bp, length); + } + + return; + bad: + fputs("[bad opt]", stdout); + if (ch != '\0') + putchar('>'); + return; + trunc: + fputs("[|tcp]", stdout); + if (ch != '\0') + putchar('>'); } /* @@ -684,23 +696,116 @@ trunc: static void print_tcp_rst_data(register const u_char *sp, u_int length) { - int c; - - if (TTEST2(*sp, length)) - printf(" [RST"); - else - printf(" [!RST"); - if (length > MAX_RST_DATA_LEN) { - length = MAX_RST_DATA_LEN; /* can use -X for longer */ - putchar('+'); /* indicate we truncate */ - } - putchar(' '); - while (length-- && sp <= snapend) { - c = *sp++; - if (isprint(c)) - putchar(c); - else - putchar('.'); + int c; + + if (TTEST2(*sp, length)) + printf(" [RST"); + else + printf(" [!RST"); + if (length > MAX_RST_DATA_LEN) { + length = MAX_RST_DATA_LEN; /* can use -X for longer */ + putchar('+'); /* indicate we truncate */ + } + putchar(' '); + while (length-- && sp <= snapend) { + c = *sp++; + safeputchar(c); + } + putchar(']'); +} + +#ifdef HAVE_LIBCRYPTO +static int +tcp_verify_signature(const struct ip *ip, const struct tcphdr *tp, + const u_char *data, int length, const u_char *rcvsig) +{ + struct tcphdr tp1; + u_char sig[TCP_SIGLEN]; + char zero_proto = 0; + MD5_CTX ctx; + u_int16_t savecsum, tlen; +#ifdef INET6 + struct ip6_hdr *ip6; + u_int32_t len32; + u_int8_t nxt; +#endif + + if (data + length > snapend) { + printf("snaplen too short, "); + return (CANT_CHECK_SIGNATURE); } - putchar(']'); + + tp1 = *tp; + + if (sigsecret == NULL) { + printf("shared secret not supplied with -M, "); + return (CANT_CHECK_SIGNATURE); + } + + MD5_Init(&ctx); + /* + * Step 1: Update MD5 hash with IP pseudo-header. + */ + if (IP_V(ip) == 4) { + MD5_Update(&ctx, (char *)&ip->ip_src, sizeof(ip->ip_src)); + MD5_Update(&ctx, (char *)&ip->ip_dst, sizeof(ip->ip_dst)); + MD5_Update(&ctx, (char *)&zero_proto, sizeof(zero_proto)); + MD5_Update(&ctx, (char *)&ip->ip_p, sizeof(ip->ip_p)); + tlen = EXTRACT_16BITS(&ip->ip_len) - IP_HL(ip) * 4; + tlen = htons(tlen); + MD5_Update(&ctx, (char *)&tlen, sizeof(tlen)); +#ifdef INET6 + } else if (IP_V(ip) == 6) { + ip6 = (struct ip6_hdr *)ip; + MD5_Update(&ctx, (char *)&ip6->ip6_src, sizeof(ip6->ip6_src)); + MD5_Update(&ctx, (char *)&ip6->ip6_dst, sizeof(ip6->ip6_dst)); + len32 = htonl(EXTRACT_16BITS(&ip6->ip6_plen)); + MD5_Update(&ctx, (char *)&len32, sizeof(len32)); + nxt = 0; + MD5_Update(&ctx, (char *)&nxt, sizeof(nxt)); + MD5_Update(&ctx, (char *)&nxt, sizeof(nxt)); + MD5_Update(&ctx, (char *)&nxt, sizeof(nxt)); + nxt = IPPROTO_TCP; + MD5_Update(&ctx, (char *)&nxt, sizeof(nxt)); +#endif + } else { +#ifdef INET6 + printf("IP version not 4 or 6, "); +#else + printf("IP version not 4, "); +#endif + return (CANT_CHECK_SIGNATURE); + } + + /* + * Step 2: Update MD5 hash with TCP header, excluding options. + * The TCP checksum must be set to zero. + */ + savecsum = tp1.th_sum; + tp1.th_sum = 0; + MD5_Update(&ctx, (char *)&tp1, sizeof(struct tcphdr)); + tp1.th_sum = savecsum; + /* + * Step 3: Update MD5 hash with TCP segment data, if present. + */ + if (length > 0) + MD5_Update(&ctx, data, length); + /* + * Step 4: Update MD5 hash with shared secret. + */ + MD5_Update(&ctx, sigsecret, strlen(sigsecret)); + MD5_Final(sig, &ctx); + + if (memcmp(rcvsig, sig, TCP_SIGLEN) == 0) + return (SIGNATURE_VALID); + else + return (SIGNATURE_INVALID); } +#endif /* HAVE_LIBCRYPTO */ + +/* + * Local Variables: + * c-style: whitesmith + * c-basic-offset: 8 + * End: + */