forked from osmocom/wireshark
135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/* packet-tcp.c
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* Routines for TCP packet disassembly
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*
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* $Id: packet-tcp.c,v 1.3 1998/09/17 03:12:28 gerald Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gtk/gtk.h>
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#include <stdio.h>
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include "ethereal.h"
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#include "packet.h"
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extern FILE* data_out_file;
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extern packet_info pi;
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void
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dissect_tcp(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
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e_tcphdr th;
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GtkWidget *tcp_tree, *ti;
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gchar flags[64] = "<None>";
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gchar *fstr[] = {"FIN", "SYN", "RST", "PSH", "ACK", "URG"};
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gint fpos = 0, i;
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guint bpos;
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/* To do: Check for {cap len,pkt len} < struct len */
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/* Avoids alignment problems on many architectures. */
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memcpy(&th, &pd[offset], sizeof(e_tcphdr));
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th.th_sport = ntohs(th.th_sport);
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th.th_dport = ntohs(th.th_dport);
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th.th_win = ntohs(th.th_win);
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th.th_sum = ntohs(th.th_sum);
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th.th_urp = ntohs(th.th_urp);
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th.th_seq = ntohl(th.th_seq);
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th.th_ack = ntohl(th.th_ack);
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for (i = 0; i < 6; i++) {
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bpos = 1 << i;
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if (th.th_flags & bpos) {
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if (fpos) {
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strcpy(&flags[fpos], ", ");
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fpos += 2;
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}
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strcpy(&flags[fpos], fstr[i]);
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fpos += 3;
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}
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}
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flags[fpos] = '\0';
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if (fd->win_info[0]) {
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strcpy(fd->win_info[3], "TCP");
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sprintf(fd->win_info[4], "Source port: %d Destination port: %d",
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th.th_sport, th.th_dport);
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}
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if (tree) {
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ti = add_item_to_tree(GTK_WIDGET(tree), offset, 20,
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"Transmission Control Protocol");
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tcp_tree = gtk_tree_new();
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add_subtree(ti, tcp_tree, ETT_TCP);
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add_item_to_tree(tcp_tree, offset, 2, "Source port: %d", th.th_sport);
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add_item_to_tree(tcp_tree, offset + 2, 2, "Destination port: %d", th.th_dport);
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add_item_to_tree(tcp_tree, offset + 4, 4, "Sequence number: 0x%08x",
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th.th_seq);
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add_item_to_tree(tcp_tree, offset + 8, 4, "Acknowledgement number: 0x%08x",
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th.th_ack);
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add_item_to_tree(tcp_tree, offset + 12, 1, "Header length: %d", th.th_off);
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add_item_to_tree(tcp_tree, offset + 13, 1, "Flags: %s", flags);
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add_item_to_tree(tcp_tree, offset + 14, 2, "Window size: %d", th.th_win);
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add_item_to_tree(tcp_tree, offset + 16, 2, "Checksum: 0x%04x", th.th_sum);
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add_item_to_tree(tcp_tree, offset + 18, 2, "Urgent pointer: 0x%04x",
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th.th_urp);
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/* To do: TCP options */
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}
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/* Skip over header + options */
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offset += 4 * th.th_off;
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/* until we decode those options, I'll check the packet length
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to see if there's more data. -- gilbert */
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if (fd->cap_len > offset) {
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switch(MIN(th.th_sport, th.th_dport)) {
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case TCP_PORT_PRINTER:
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dissect_lpd(pd, offset, fd, tree);
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break;
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default:
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dissect_data(pd, offset, fd, tree);
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}
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}
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pi.srcport = th.th_sport;
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pi.destport = th.th_dport;
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if( data_out_file ) {
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reassemble_tcp( th.th_seq, /* sequence number */
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( pi.iplen -( pi.iphdrlen * 4 )-( th.th_off * 4 ) ), /* length */
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( pd+offset ), /* data */
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( th.th_flags & 0x02 ), /* is syn set? */
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pi.ip_src ); /* src ip */
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}
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}
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