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/* packet-tcp.c
* Routines for TCP packet disassembly
*
* $Id: packet-tcp.c,v 1.105 2001/06/18 02:17:53 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include "in_cksum.h"
#ifdef NEED_SNPRINTF_H
# include "snprintf.h"
#endif
#include "resolv.h"
#include "ipproto.h"
#include "follow.h"
#include "prefs.h"
#include "packet-tcp.h"
#include "packet-ip.h"
#include "conversation.h"
#include "strutil.h"
/* Place TCP summary in proto tree */
static gboolean tcp_summary_in_tree = TRUE;
extern FILE* data_out_file;
guint16 tcp_urgent_pointer;
static int proto_tcp = -1;
static int hf_tcp_srcport = -1;
static int hf_tcp_dstport = -1;
static int hf_tcp_port = -1;
static int hf_tcp_seq = -1;
static int hf_tcp_nxtseq = -1;
static int hf_tcp_ack = -1;
static int hf_tcp_hdr_len = -1;
static int hf_tcp_flags = -1;
static int hf_tcp_flags_cwr = -1;
static int hf_tcp_flags_ecn = -1;
static int hf_tcp_flags_urg = -1;
static int hf_tcp_flags_ack = -1;
static int hf_tcp_flags_push = -1;
static int hf_tcp_flags_reset = -1;
static int hf_tcp_flags_syn = -1;
static int hf_tcp_flags_fin = -1;
static int hf_tcp_window_size = -1;
static int hf_tcp_checksum = -1;
static int hf_tcp_checksum_bad = -1;
static int hf_tcp_urgent_pointer = -1;
static gint ett_tcp = -1;
static gint ett_tcp_flags = -1;
static gint ett_tcp_options = -1;
static gint ett_tcp_option_sack = -1;
static dissector_table_t subdissector_table;
static heur_dissector_list_t heur_subdissector_list;
static conv_dissector_list_t conv_subdissector_list;
/* TCP Ports */
#define TCP_PORT_SMTP 25
/* TCP structs and definitions */
typedef struct _e_tcphdr {
guint16 th_sport;
guint16 th_dport;
guint32 th_seq;
guint32 th_ack;
guint8 th_off_x2; /* combines th_off and th_x2 */
guint8 th_flags;
#define TH_FIN 0x01
#define TH_SYN 0x02
#define TH_RST 0x04
#define TH_PUSH 0x08
#define TH_ACK 0x10
#define TH_URG 0x20
#define TH_ECN 0x40
#define TH_CWR 0x80
guint16 th_win;
guint16 th_sum;
guint16 th_urp;
} e_tcphdr;
/* Minimum TCP header length. */
#define TCPH_MIN_LEN 20
/*
* TCP option
*/
#define TCPOPT_NOP 1 /* Padding */
#define TCPOPT_EOL 0 /* End of options */
#define TCPOPT_MSS 2 /* Segment size negotiating */
#define TCPOPT_WINDOW 3 /* Window scaling */
#define TCPOPT_SACK_PERM 4 /* SACK Permitted */
#define TCPOPT_SACK 5 /* SACK Block */
#define TCPOPT_ECHO 6
#define TCPOPT_ECHOREPLY 7
#define TCPOPT_TIMESTAMP 8 /* Better RTT estimations/PAWS */
#define TCPOPT_CC 11
#define TCPOPT_CCNEW 12
#define TCPOPT_CCECHO 13
#define TCPOPT_MD5 19 /* RFC2385 */
/*
* TCP option lengths
*/
#define TCPOLEN_MSS 4
#define TCPOLEN_WINDOW 3
#define TCPOLEN_SACK_PERM 2
#define TCPOLEN_SACK_MIN 2
#define TCPOLEN_ECHO 6
#define TCPOLEN_ECHOREPLY 6
#define TCPOLEN_TIMESTAMP 10
#define TCPOLEN_CC 6
#define TCPOLEN_CCNEW 6
#define TCPOLEN_CCECHO 6
#define TCPOLEN_MD5 18
static void
tcp_info_append_uint(frame_data *fd, const char *abbrev, guint32 val)
{
if (check_col(fd, COL_INFO))
col_append_fstr(fd, COL_INFO, " %s=%u", abbrev, val);
}
static void
dissect_tcpopt_maxseg(const ip_tcp_opt *optp, tvbuff_t *tvb,
int offset, guint optlen, frame_data *fd, proto_tree *opt_tree)
{
guint16 mss;
mss = tvb_get_ntohs(tvb, offset + 2);
proto_tree_add_text(opt_tree, tvb, offset, optlen,
"%s: %u bytes", optp->name, mss);
tcp_info_append_uint(fd, "MSS", mss);
}
static void
dissect_tcpopt_wscale(const ip_tcp_opt *optp, tvbuff_t *tvb,
int offset, guint optlen, frame_data *fd, proto_tree *opt_tree)
{
guint8 ws;
ws = tvb_get_guint8(tvb, offset + 2);
proto_tree_add_text(opt_tree, tvb, offset, optlen,
"%s: %u bytes", optp->name, ws);
tcp_info_append_uint(fd, "WS", ws);
}
static void
dissect_tcpopt_sack(const ip_tcp_opt *optp, tvbuff_t *tvb,
int offset, guint optlen, frame_data *fd, proto_tree *opt_tree)
{
proto_tree *field_tree = NULL;
proto_item *tf;
guint leftedge, rightedge;
tf = proto_tree_add_text(opt_tree, tvb, offset, optlen, "%s:", optp->name);
offset += 2; /* skip past type and length */
optlen -= 2; /* subtract size of type and length */
while (optlen > 0) {
if (field_tree == NULL) {
/* Haven't yet made a subtree out of this option. Do so. */
field_tree = proto_item_add_subtree(tf, *optp->subtree_index);
}
if (optlen < 4) {
proto_tree_add_text(field_tree, tvb, offset, optlen,
"(suboption would go past end of option)");
break;
}
leftedge = tvb_get_ntohl(tvb, offset);
optlen -= 4;
if (optlen < 4) {
proto_tree_add_text(field_tree, tvb, offset, optlen,
"(suboption would go past end of option)");
break;
}
/* XXX - check whether it goes past end of packet */
rightedge = tvb_get_ntohl(tvb, offset + 4);
optlen -= 4;
proto_tree_add_text(field_tree, tvb, offset, 8,
"left edge = %u, right edge = %u", leftedge, rightedge);
tcp_info_append_uint(fd, "SLE", leftedge);
tcp_info_append_uint(fd, "SRE", rightedge);
offset += 8;
}
}
static void
dissect_tcpopt_echo(const ip_tcp_opt *optp, tvbuff_t *tvb,
int offset, guint optlen, frame_data *fd, proto_tree *opt_tree)
{
guint32 echo;
echo = tvb_get_ntohl(tvb, offset + 2);
proto_tree_add_text(opt_tree, tvb, offset, optlen,
"%s: %u", optp->name, echo);
tcp_info_append_uint(fd, "ECHO", echo);
}
static void
dissect_tcpopt_timestamp(const ip_tcp_opt *optp, tvbuff_t *tvb,
int offset, guint optlen, frame_data *fd, proto_tree *opt_tree)
{
guint32 tsv, tser;
tsv = tvb_get_ntohl(tvb, offset + 2);
tser = tvb_get_ntohl(tvb, offset + 6);
proto_tree_add_text(opt_tree, tvb, offset, optlen,
"%s: tsval %u, tsecr %u", optp->name, tsv, tser);
tcp_info_append_uint(fd, "TSV", tsv);
tcp_info_append_uint(fd, "TSER", tser);
}
static void
dissect_tcpopt_cc(const ip_tcp_opt *optp, tvbuff_t *tvb,
int offset, guint optlen, frame_data *fd, proto_tree *opt_tree)
{
guint32 cc;
cc = tvb_get_ntohl(tvb, offset + 2);
proto_tree_add_text(opt_tree, tvb, offset, optlen,
"%s: %u", optp->name, cc);
tcp_info_append_uint(fd, "CC", cc);
}
static const ip_tcp_opt tcpopts[] = {
{
TCPOPT_EOL,
"EOL",
NULL,
NO_LENGTH,
0,
NULL,
},
{
TCPOPT_NOP,
"NOP",
NULL,
NO_LENGTH,
0,
NULL,
},
{
TCPOPT_MSS,
"Maximum segment size",
NULL,
FIXED_LENGTH,
TCPOLEN_MSS,
dissect_tcpopt_maxseg
},
{
TCPOPT_WINDOW,
"Window scale",
NULL,
FIXED_LENGTH,
TCPOLEN_WINDOW,
dissect_tcpopt_wscale
},
{
TCPOPT_SACK_PERM,
"SACK permitted",
NULL,
FIXED_LENGTH,
TCPOLEN_SACK_PERM,
NULL,
},
{
TCPOPT_SACK,
"SACK",
&ett_tcp_option_sack,
VARIABLE_LENGTH,
TCPOLEN_SACK_MIN,
dissect_tcpopt_sack
},
{
TCPOPT_ECHO,
"Echo",
NULL,
FIXED_LENGTH,
TCPOLEN_ECHO,
dissect_tcpopt_echo
},
{
TCPOPT_ECHOREPLY,
"Echo reply",
NULL,
FIXED_LENGTH,
TCPOLEN_ECHOREPLY,
dissect_tcpopt_echo
},
{
TCPOPT_TIMESTAMP,
"Time stamp",
NULL,
FIXED_LENGTH,
TCPOLEN_TIMESTAMP,
dissect_tcpopt_timestamp
},
{
TCPOPT_CC,
"CC",
NULL,
FIXED_LENGTH,
TCPOLEN_CC,
dissect_tcpopt_cc
},
{
TCPOPT_CCNEW,
"CC.NEW",
NULL,
FIXED_LENGTH,
TCPOPT_CCNEW,
dissect_tcpopt_cc
},
{
TCPOPT_CCECHO,
"CC.ECHO",
NULL,
FIXED_LENGTH,
TCPOLEN_CCECHO,
dissect_tcpopt_cc
},
{
TCPOPT_MD5,
"TCP MD5 signature",
NULL,
FIXED_LENGTH,
TCPOLEN_MD5,
NULL
}
};
#define N_TCP_OPTS (sizeof tcpopts / sizeof tcpopts[0])
/* TCP flags flag */
static const true_false_string flags_set_truth = {
"Set",
"Not set"
};
/* Determine if there is a sub-dissector and call it. This has been */
/* separated into a stand alone routine to other protocol dissectors */
/* can call to it, ie. socks */
void
decode_tcp_ports(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, int src_port, int dst_port)
{
tvbuff_t *next_tvb;
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
/* determine if this packet is part of a conversation and call dissector */
/* for the conversation if available */
if (try_conversation_dissector(&pinfo->src, &pinfo->dst, PT_TCP,
src_port, dst_port, next_tvb, pinfo, tree))
return;
/* do lookup with the subdissector table */
if (dissector_try_port(subdissector_table, src_port, next_tvb, pinfo, tree) ||
dissector_try_port(subdissector_table, dst_port, next_tvb, pinfo, tree))
return;
/* do lookup with the heuristic subdissector table */
if (dissector_try_heuristic(heur_subdissector_list, next_tvb, pinfo, tree))
return;
/* Oh, well, we don't know this; dissect it as data. */
dissect_data(next_tvb, 0, pinfo, tree);
}
static void
dissect_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
e_tcphdr th;
proto_tree *tcp_tree = NULL, *field_tree = NULL;
proto_item *ti, *tf;
int offset = 0;
gchar flags[64] = "<None>";
gchar *fstr[] = {"FIN", "SYN", "RST", "PSH", "ACK", "URG", "ECN", "CWR" };
gint fpos = 0, i;
guint bpos;
guint hlen;
guint optlen;
guint32 seglen;
guint32 nxtseq;
guint len;
guint reported_len;
vec_t cksum_vec[4];
guint32 phdr[2];
guint16 computed_cksum;
guint length_remaining;
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "TCP");
/* Clear out the Info column. */
if (check_col(pinfo->fd, COL_INFO))
col_clear(pinfo->fd, COL_INFO);
/* Avoids alignment problems on many architectures. */
tvb_memcpy(tvb, (guint8 *)&th, offset, sizeof(e_tcphdr));
th.th_sport = ntohs(th.th_sport);
th.th_dport = ntohs(th.th_dport);
th.th_win = ntohs(th.th_win);
th.th_sum = ntohs(th.th_sum);
th.th_urp = ntohs(th.th_urp);
th.th_seq = ntohl(th.th_seq);
th.th_ack = ntohl(th.th_ack);
/* Export the urgent pointer, for the benefit of protocols such as
rlogin. */
tcp_urgent_pointer = th.th_urp;
if (check_col(pinfo->fd, COL_INFO) || tree) {
for (i = 0; i < 8; i++) {
bpos = 1 << i;
if (th.th_flags & bpos) {
if (fpos) {
strcpy(&flags[fpos], ", ");
fpos += 2;
}
strcpy(&flags[fpos], fstr[i]);
fpos += 3;
}
}
flags[fpos] = '\0';
}
hlen = hi_nibble(th.th_off_x2) * 4; /* TCP header length, in bytes */
reported_len = tvb_reported_length(tvb);
len = tvb_length(tvb);
/* Compute the length of data in this segment. */
seglen = reported_len - hlen;
/* Compute the sequence number of next octet after this segment. */
nxtseq = th.th_seq + seglen;
if (hlen < TCPH_MIN_LEN) {
if (check_col(pinfo->fd, COL_INFO))
col_add_fstr(pinfo->fd, COL_INFO, "Bogus TCP header length (%u, must be at least %u)",
hlen, TCPH_MIN_LEN);
ti = proto_tree_add_item(tree, proto_tcp, tvb, offset, hlen, FALSE);
tcp_tree = proto_item_add_subtree(ti, ett_tcp);
if (tree) {
proto_tree_add_uint_format(tcp_tree, hf_tcp_hdr_len, tvb, offset, 1, hlen,
"Header length: %u bytes (bogus, must be at least %u)", hlen,
TCPH_MIN_LEN);
}
return;
}
if (check_col(pinfo->fd, COL_INFO)) {
if (th.th_flags & TH_URG)
col_append_fstr(pinfo->fd, COL_INFO, "%s > %s [%s] Seq=%u Ack=%u Win=%u Urg=%u Len=%d",
get_tcp_port(th.th_sport), get_tcp_port(th.th_dport), flags,
th.th_seq, th.th_ack, th.th_win, th.th_urp, seglen);
else
col_append_fstr(pinfo->fd, COL_INFO, "%s > %s [%s] Seq=%u Ack=%u Win=%u Len=%d",
get_tcp_port(th.th_sport), get_tcp_port(th.th_dport), flags,
th.th_seq, th.th_ack, th.th_win, seglen);
}
if (tree) {
if (tcp_summary_in_tree && hlen >= TCPH_MIN_LEN) {
ti = proto_tree_add_protocol_format(tree, proto_tcp, tvb, offset,
hlen,
"Transmission Control Protocol, Src Port: %s (%u), Dst Port: %s (%u), Seq: %u, Ack: %u",
get_tcp_port(th.th_sport), th.th_sport,
get_tcp_port(th.th_dport), th.th_dport, th.th_seq, th.th_ack);
}
else {
ti = proto_tree_add_item(tree, proto_tcp, tvb, offset, hlen, FALSE);
}
tcp_tree = proto_item_add_subtree(ti, ett_tcp);
proto_tree_add_uint_format(tcp_tree, hf_tcp_srcport, tvb, offset, 2, th.th_sport,
"Source port: %s (%u)", get_tcp_port(th.th_sport), th.th_sport);
proto_tree_add_uint_format(tcp_tree, hf_tcp_dstport, tvb, offset + 2, 2, th.th_dport,
"Destination port: %s (%u)", get_tcp_port(th.th_dport), th.th_dport);
proto_tree_add_uint_hidden(tcp_tree, hf_tcp_port, tvb, offset, 2, th.th_sport);
proto_tree_add_uint_hidden(tcp_tree, hf_tcp_port, tvb, offset + 2, 2, th.th_dport);
proto_tree_add_uint(tcp_tree, hf_tcp_seq, tvb, offset + 4, 4, th.th_seq);
if (nxtseq != th.th_seq)
proto_tree_add_uint(tcp_tree, hf_tcp_nxtseq, tvb, offset, 0, nxtseq);
if (th.th_flags & TH_ACK)
proto_tree_add_uint(tcp_tree, hf_tcp_ack, tvb, offset + 8, 4, th.th_ack);
proto_tree_add_uint_format(tcp_tree, hf_tcp_hdr_len, tvb, offset + 12, 1, hlen,
"Header length: %u bytes", hlen);
tf = proto_tree_add_uint_format(tcp_tree, hf_tcp_flags, tvb, offset + 13, 1,
th.th_flags, "Flags: 0x%04x (%s)", th.th_flags, flags);
field_tree = proto_item_add_subtree(tf, ett_tcp_flags);
proto_tree_add_boolean(field_tree, hf_tcp_flags_cwr, tvb, offset + 13, 1, th.th_flags);
proto_tree_add_boolean(field_tree, hf_tcp_flags_ecn, tvb, offset + 13, 1, th.th_flags);
proto_tree_add_boolean(field_tree, hf_tcp_flags_urg, tvb, offset + 13, 1, th.th_flags);
proto_tree_add_boolean(field_tree, hf_tcp_flags_ack, tvb, offset + 13, 1, th.th_flags);
proto_tree_add_boolean(field_tree, hf_tcp_flags_push, tvb, offset + 13, 1, th.th_flags);
proto_tree_add_boolean(field_tree, hf_tcp_flags_reset, tvb, offset + 13, 1, th.th_flags);
proto_tree_add_boolean(field_tree, hf_tcp_flags_syn, tvb, offset + 13, 1, th.th_flags);
proto_tree_add_boolean(field_tree, hf_tcp_flags_fin, tvb, offset + 13, 1, th.th_flags);
proto_tree_add_uint(tcp_tree, hf_tcp_window_size, tvb, offset + 14, 2, th.th_win);
if (!pinfo->fragmented && len >= reported_len) {
/* The packet isn't part of a fragmented datagram and isn't
truncated, so we can checksum it.
XXX - make a bigger scatter-gather list once we do fragment
reassembly? */
/* Set up the fields of the pseudo-header. */
cksum_vec[0].ptr = pinfo->src.data;
cksum_vec[0].len = pinfo->src.len;
cksum_vec[1].ptr = pinfo->dst.data;
cksum_vec[1].len = pinfo->dst.len;
cksum_vec[2].ptr = (const guint8 *)&phdr;
switch (pinfo->src.type) {
case AT_IPv4:
phdr[0] = htonl((IP_PROTO_TCP<<16) + reported_len);
cksum_vec[2].len = 4;
break;
case AT_IPv6:
phdr[0] = htonl(reported_len);
phdr[1] = htonl(IP_PROTO_TCP);
cksum_vec[2].len = 8;
break;
default:
/* TCP runs only atop IPv4 and IPv6.... */
g_assert_not_reached();
break;
}
cksum_vec[3].ptr = tvb_get_ptr(tvb, offset, len);
cksum_vec[3].len = reported_len;
computed_cksum = in_cksum(&cksum_vec[0], 4);
if (computed_cksum == 0) {
proto_tree_add_uint_format(tcp_tree, hf_tcp_checksum, tvb,
offset + 16, 2, th.th_sum, "Checksum: 0x%04x (correct)", th.th_sum);
} else {
proto_tree_add_boolean_hidden(tcp_tree, hf_tcp_checksum_bad, tvb,
offset + 16, 2, TRUE);
proto_tree_add_uint_format(tcp_tree, hf_tcp_checksum, tvb,
offset + 16, 2, th.th_sum,
"Checksum: 0x%04x (incorrect, should be 0x%04x)", th.th_sum,
in_cksum_shouldbe(th.th_sum, computed_cksum));
}
} else {
proto_tree_add_uint_format(tcp_tree, hf_tcp_checksum, tvb,
offset + 16, 2, th.th_sum, "Checksum: 0x%04x", th.th_sum);
}
if (th.th_flags & TH_URG)
proto_tree_add_uint(tcp_tree, hf_tcp_urgent_pointer, tvb, offset + 18, 2, th.th_urp);
}
/* Decode TCP options, if any. */
if (tree && hlen > sizeof (e_tcphdr)) {
/* There's more than just the fixed-length header. Decode the
options. */
optlen = hlen - sizeof (e_tcphdr); /* length of options, in bytes */
tf = proto_tree_add_text(tcp_tree, tvb, offset + 20, optlen,
"Options: (%d bytes)", optlen);
field_tree = proto_item_add_subtree(tf, ett_tcp_options);
dissect_ip_tcp_options(tvb, offset + 20, optlen,
tcpopts, N_TCP_OPTS, TCPOPT_EOL, pinfo->fd, field_tree);
}
/* Skip over header + options */
offset += hlen;
pinfo->ptype = PT_TCP;
pinfo->srcport = th.th_sport;
pinfo->destport = th.th_dport;
/* Check the packet length to see if there's more data
(it could be an ACK-only packet) */
length_remaining = tvb_length_remaining(tvb, offset);
if (length_remaining != 0) {
if (th.th_flags & TH_RST) {
/*
* RFC1122 says:
*
* 4.2.2.12 RST Segment: RFC-793 Section 3.4
*
* A TCP SHOULD allow a received RST segment to include data.
*
* DISCUSSION
* It has been suggested that a RST segment could contain
* ASCII text that encoded and explained the cause of the
* RST. No standard has yet been established for such
* data.
*
* so for segments with RST we just display the data as text.
*/
proto_tree_add_text(tcp_tree, tvb, offset, length_remaining,
"Reset cause: %s",
tvb_format_text(tvb, offset, length_remaining));
} else
decode_tcp_ports( tvb, offset, pinfo, tree, th.th_sport, th.th_dport);
}
if( data_out_file ) {
reassemble_tcp( th.th_seq, /* sequence number */
seglen, /* data length */
tvb_get_ptr(tvb, offset, length_remaining), /* data */
length_remaining, /* captured data length */
( th.th_flags & TH_SYN ), /* is syn set? */
&pinfo->net_src,
&pinfo->net_dst,
pinfo->srcport,
pinfo->destport);
}
}
void
proto_register_tcp(void)
{
static hf_register_info hf[] = {
{ &hf_tcp_srcport,
{ "Source Port", "tcp.srcport", FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_tcp_dstport,
{ "Destination Port", "tcp.dstport", FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_tcp_port,
{ "Source or Destination Port", "tcp.port", FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_tcp_seq,
{ "Sequence number", "tcp.seq", FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_tcp_nxtseq,
{ "Next sequence number", "tcp.nxtseq", FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_tcp_ack,
{ "Acknowledgement number", "tcp.ack", FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_tcp_hdr_len,
{ "Header Length", "tcp.hdr_len", FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_tcp_flags,
{ "Flags", "tcp.flags", FT_UINT8, BASE_HEX, NULL, 0x0,
"", HFILL }},
{ &hf_tcp_flags_cwr,
{ "Congestion Window Reduced (CWR)", "tcp.flags.cwr", FT_BOOLEAN, 8, TFS(&flags_set_truth), TH_CWR,
"", HFILL }},
{ &hf_tcp_flags_ecn,
{ "ECN-Echo", "tcp.flags.ecn", FT_BOOLEAN, 8, TFS(&flags_set_truth), TH_ECN,
"", HFILL }},
{ &hf_tcp_flags_urg,
{ "Urgent", "tcp.flags.urg", FT_BOOLEAN, 8, TFS(&flags_set_truth), TH_URG,
"", HFILL }},
{ &hf_tcp_flags_ack,
{ "Acknowledgment", "tcp.flags.ack", FT_BOOLEAN, 8, TFS(&flags_set_truth), TH_ACK,
"", HFILL }},
{ &hf_tcp_flags_push,
{ "Push", "tcp.flags.push", FT_BOOLEAN, 8, TFS(&flags_set_truth), TH_PUSH,
"", HFILL }},
{ &hf_tcp_flags_reset,
{ "Reset", "tcp.flags.reset", FT_BOOLEAN, 8, TFS(&flags_set_truth), TH_RST,
"", HFILL }},
{ &hf_tcp_flags_syn,
{ "Syn", "tcp.flags.syn", FT_BOOLEAN, 8, TFS(&flags_set_truth), TH_SYN,
"", HFILL }},
{ &hf_tcp_flags_fin,
{ "Fin", "tcp.flags.fin", FT_BOOLEAN, 8, TFS(&flags_set_truth), TH_FIN,
"", HFILL }},
{ &hf_tcp_window_size,
{ "Window size", "tcp.window_size", FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_tcp_checksum,
{ "Checksum", "tcp.checksum", FT_UINT16, BASE_HEX, NULL, 0x0,
"", HFILL }},
{ &hf_tcp_checksum_bad,
{ "Bad Checksum", "tcp.checksum_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"", HFILL }},
{ &hf_tcp_urgent_pointer,
{ "Urgent pointer", "tcp.urgent_pointer", FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }},
};
static gint *ett[] = {
&ett_tcp,
&ett_tcp_flags,
&ett_tcp_options,
&ett_tcp_option_sack,
};
module_t *tcp_module;
proto_tcp = proto_register_protocol("Transmission Control Protocol",
"TCP", "tcp");
proto_register_field_array(proto_tcp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* subdissector code */
subdissector_table = register_dissector_table("tcp.port");
register_heur_dissector_list("tcp", &heur_subdissector_list);
register_conv_dissector_list("tcp", &conv_subdissector_list);
/* Register configuration preferences */
tcp_module = prefs_register_protocol(proto_tcp, NULL);
prefs_register_bool_preference(tcp_module, "tcp_summary_in_tree",
"Show TCP summary in protocol tree",
"Whether the TCP summary line should be shown in the protocol tree",
&tcp_summary_in_tree);
}
void
proto_reg_handoff_tcp(void)
{
dissector_add("ip.proto", IP_PROTO_TCP, dissect_tcp, proto_tcp);
}
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