forked from osmocom/wireshark
237 lines
6.7 KiB
C
237 lines
6.7 KiB
C
/* packet-udp.c
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* Routines for UDP packet disassembly
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*
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* $Id: packet-udp.c,v 1.72 2000/05/31 05:07:52 guy 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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* Richard Sharpe, 13-Feb-1999, added dispatch table support and
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* support for tftp.
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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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#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 <stdio.h>
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#include <stdlib.h>
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#include <glib.h>
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#include "globals.h"
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#include "resolv.h"
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#include "plugins.h"
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#include "packet-udp.h"
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#include "packet-ip.h"
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#include "packet-rpc.h"
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#include "packet-tftp.h"
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#include "packet-vines.h"
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static int proto_udp = -1;
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static int hf_udp_srcport = -1;
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static int hf_udp_dstport = -1;
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static int hf_udp_port = -1;
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static int hf_udp_length = -1;
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static int hf_udp_checksum = -1;
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static gint ett_udp = -1;
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/* UDP structs and definitions */
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typedef struct _e_udphdr {
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guint16 uh_sport;
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guint16 uh_dport;
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guint16 uh_ulen;
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guint16 uh_sum;
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} e_udphdr;
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/* UDP Ports -> should go in packet-udp.h */
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#define UDP_PORT_TFTP 69
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#define UDP_PORT_VINES 573
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static dissector_table_t udp_dissector_table;
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/* Determine if there is a sub-dissector and call it. This has been */
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/* separated into a stand alone routine to other protocol dissectors */
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/* can call to it, ie. socks */
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void
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decode_udp_ports( const u_char *pd, int offset, frame_data *fd,
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proto_tree *tree, int uh_sport, int uh_dport){
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dissector_t sub_dissector;
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/* determine if this packet is part of a conversation and call dissector */
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/* for the conversation if available */
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sub_dissector = find_conversation_dissector( &pi.src, &pi.dst, PT_UDP,
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uh_sport, uh_dport);
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if (sub_dissector){
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(sub_dissector)(pd, offset, fd, tree);
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return;
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}
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/* ONC RPC. We can't base this on anything in the UDP header; we have
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to look at the payload. If "dissect_rpc()" returns TRUE, it was
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an RPC packet, otherwise it's some other type of packet. */
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if (dissect_rpc(pd, offset, fd, tree))
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return;
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/* try to apply the plugins */
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#ifdef HAVE_PLUGINS
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{
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plugin *pt_plug = plugin_list;
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if (enabled_plugins_number > 0) {
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while (pt_plug) {
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if (pt_plug->enabled && !strcmp(pt_plug->protocol, "udp") &&
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tree && dfilter_apply(pt_plug->filter, tree, pd, fd->cap_len)) {
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pt_plug->dissector(pd, offset, fd, tree);
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return;
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}
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pt_plug = pt_plug->next;
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}
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}
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}
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#endif
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/* do lookup with the subdissector table */
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if (dissector_try_port(udp_dissector_table, uh_sport, pd, offset, fd, tree) ||
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dissector_try_port(udp_dissector_table, uh_dport, pd, offset, fd, tree))
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return;
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/* XXX - we should do these with the subdissector table as well. */
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#define PORT_IS(port) (uh_sport == port || uh_dport == port)
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if (PORT_IS(UDP_PORT_VINES)) {
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/* FIXME: AFAIK, src and dst port must be the same */
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dissect_vines_frp(pd, offset, fd, tree);
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} else if (PORT_IS(UDP_PORT_TFTP)) {
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/* This is the first point of call, but it adds a dynamic call */
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dissector_add("udp.port", MAX(uh_sport, uh_dport), dissect_tftp); /* Add to table */
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dissect_tftp(pd, offset, fd, tree);
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} else
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dissect_data(pd, offset, fd, tree);
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}
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static void
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dissect_udp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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e_udphdr uh;
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guint16 uh_sport, uh_dport, uh_ulen, uh_sum;
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proto_tree *udp_tree;
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proto_item *ti;
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if (!BYTES_ARE_IN_FRAME(offset, sizeof(e_udphdr))) {
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dissect_data(pd, offset, fd, tree);
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return;
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}
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/* Avoids alignment problems on many architectures. */
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memcpy(&uh, &pd[offset], sizeof(e_udphdr));
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uh_sport = ntohs(uh.uh_sport);
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uh_dport = ntohs(uh.uh_dport);
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uh_ulen = ntohs(uh.uh_ulen);
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uh_sum = ntohs(uh.uh_sum);
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "UDP");
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if (check_col(fd, COL_INFO))
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col_add_fstr(fd, COL_INFO, "Source port: %s Destination port: %s",
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get_udp_port(uh_sport), get_udp_port(uh_dport));
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if (tree) {
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ti = proto_tree_add_item(tree, proto_udp, NullTVB, offset, 8, FALSE);
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udp_tree = proto_item_add_subtree(ti, ett_udp);
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proto_tree_add_uint_format(udp_tree, hf_udp_srcport, NullTVB, offset, 2, uh_sport,
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"Source port: %s (%u)", get_udp_port(uh_sport), uh_sport);
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proto_tree_add_uint_format(udp_tree, hf_udp_dstport, NullTVB, offset + 2, 2, uh_dport,
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"Destination port: %s (%u)", get_udp_port(uh_dport), uh_dport);
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proto_tree_add_uint_hidden(udp_tree, hf_udp_port, NullTVB, offset, 2, uh_sport);
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proto_tree_add_uint_hidden(udp_tree, hf_udp_port, NullTVB, offset+2, 2, uh_dport);
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proto_tree_add_uint(udp_tree, hf_udp_length, NullTVB, offset + 4, 2, uh_ulen);
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proto_tree_add_uint_format(udp_tree, hf_udp_checksum, NullTVB, offset + 6, 2, uh_sum,
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"Checksum: 0x%04x", uh_sum);
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}
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/* Skip over header */
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offset += 8;
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pi.ptype = PT_UDP;
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pi.srcport = uh_sport;
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pi.destport = uh_dport;
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/* call sub-dissectors */
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decode_udp_ports( pd, offset, fd, tree, uh_sport, uh_dport);
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}
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void
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proto_register_udp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_udp_srcport,
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{ "Source Port", "udp.srcport", FT_UINT16, BASE_DEC, NULL, 0x0,
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"" }},
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{ &hf_udp_dstport,
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{ "Destination Port", "udp.dstport", FT_UINT16, BASE_DEC, NULL, 0x0,
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"" }},
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{ &hf_udp_port,
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{ "Source or Destination Port", "udp.port", FT_UINT16, BASE_DEC, NULL, 0x0,
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"" }},
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{ &hf_udp_length,
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{ "Length", "udp.length", FT_UINT16, BASE_DEC, NULL, 0x0,
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"" }},
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{ &hf_udp_checksum,
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{ "Checksum", "udp.checksum", FT_UINT16, BASE_HEX, NULL, 0x0,
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"" }},
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};
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static gint *ett[] = {
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&ett_udp,
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};
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proto_udp = proto_register_protocol("User Datagram Protocol", "udp");
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proto_register_field_array(proto_udp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* subdissector code */
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udp_dissector_table = register_dissector_table("udp.port");
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}
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void
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proto_reg_handoff_udp(void)
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{
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dissector_add("ip.proto", IP_PROTO_UDP, dissect_udp);
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}
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