forked from osmocom/wireshark
![João Valverde](/assets/img/avatar_default.png)
Mirror it after protocol dissector API. Change-Id: I7985bcfa9e07654c7cf005efec94efc205d7a304 Reviewed-on: https://code.wireshark.org/review/18496 Reviewed-by: Michael Mann <mmann78@netscape.net>
639 lines
17 KiB
C
639 lines
17 KiB
C
/* packet-netrom.c
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*
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* Routines for Amateur Packet Radio protocol dissection
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* NET/ROM inter-node frames.
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* Copyright 2005,2006,2007,2008,2009,2010,2012 R.W. Stearn <richard@rns-stearn.demon.co.uk>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* Information on the protocol drawn from:
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*
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* Protocol specification is at:
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*
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* ftp://ftp.ucsd.edu/hamradio/packet/tcpip/docs/netrom.ps.gz
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*
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* (yes, it's PostScript, and, yes, it's an FTP URL).
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*
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* Inspiration on how to build the dissector drawn from
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* packet-sdlc.c
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* packet-x25.c
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* packet-lapb.c
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* paket-gprs-llc.c
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* xdlc.c
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* with the base file built from README.developers.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/to_str.h>
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#include <epan/capture_dissectors.h>
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#include <epan/ax25_pids.h>
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void proto_register_netrom(void);
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void proto_reg_handoff_netrom(void);
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#define STRLEN 80
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#define NETROM_MIN_SIZE 7 /* minimum payload for a routing packet */
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#define NETROM_HEADER_SIZE 20 /* minimum payload for a normal packet */
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#define NETROM_PROTOEXT 0x00
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#define NETROM_CONNREQ 0x01
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#define NETROM_CONNACK 0x02
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#define NETROM_DISCREQ 0x03
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#define NETROM_DISCACK 0x04
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#define NETROM_INFO 0x05
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#define NETROM_INFOACK 0x06
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#define NETROM_MORE_FLAG 0x20
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#define NETROM_NAK_FLAG 0x40
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#define NETROM_CHOKE_FLAG 0x80
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#define NETROM_PROTO_IP 0x0C
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/* Dissector handles */
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static dissector_handle_t ip_handle;
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/* Initialize the protocol and registered fields */
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static int proto_netrom = -1;
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static int hf_netrom_src = -1;
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static int hf_netrom_dst = -1;
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static int hf_netrom_ttl = -1;
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static int hf_netrom_my_cct_index = -1;
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static int hf_netrom_my_cct_id = -1;
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static int hf_netrom_your_cct_index = -1;
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static int hf_netrom_your_cct_id = -1;
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static int hf_netrom_n_r = -1;
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static int hf_netrom_n_s = -1;
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static int hf_netrom_type = -1;
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static int hf_netrom_op = -1;
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static int hf_netrom_more = -1;
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static int hf_netrom_nak = -1;
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static int hf_netrom_choke = -1;
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static int hf_netrom_user = -1;
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static int hf_netrom_node = -1;
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static int hf_netrom_pwindow = -1;
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static int hf_netrom_awindow = -1;
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static int hf_netrom_mnemonic = -1;
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/*
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* Structure containing pointers to hf_ values for various subfields of
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* the type field.
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*/
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typedef struct {
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int *hf_tf_op;
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int *hf_tf_more;
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int *hf_tf_nak;
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int *hf_tf_choke;
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} netrom_tf_items;
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static const netrom_tf_items netrom_type_items = {
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&hf_netrom_op,
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&hf_netrom_more,
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&hf_netrom_nak,
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&hf_netrom_choke
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};
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const value_string op_code_vals_abbrev[] = {
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{ NETROM_PROTOEXT , "PROTOEXT"},
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{ NETROM_CONNREQ , "CONNREQ"},
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{ NETROM_CONNACK , "CONNACK"},
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{ NETROM_DISCREQ , "DISCREQ"},
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{ NETROM_DISCACK , "DISCACK"},
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{ NETROM_INFO , "INFO"},
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{ NETROM_INFOACK , "INFOACK"},
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{ 0 , NULL}
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};
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const value_string op_code_vals_text[] = {
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{ NETROM_PROTOEXT , "Protocol extension"},
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{ NETROM_CONNREQ , "Connect request"},
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{ NETROM_CONNACK , "Connect acknowledge"},
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{ NETROM_DISCREQ , "Disconnect request"},
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{ NETROM_DISCACK , "Disconnect acknowledge"},
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{ NETROM_INFO , "Information"},
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{ NETROM_INFOACK , "Information acknowledge"},
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{ 0 , NULL}
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};
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/* Initialize the subtree pointers */
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static gint ett_netrom = -1;
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static gint ett_netrom_type = -1;
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static void
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dissect_netrom_type(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree,
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int hf_netrom_type_param, gint ett_netrom_type_param, const netrom_tf_items *type_items )
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{
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proto_tree *tc;
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proto_tree *type_tree;
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char *info_buffer;
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guint8 type;
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guint8 op_code;
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type = tvb_get_guint8( tvb, offset );
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op_code = type &0x0f;
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info_buffer = wmem_strdup_printf( wmem_packet_scope(), "%s%s%s%s (0x%02x)",
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val_to_str_const( op_code, op_code_vals_text, "Unknown" ),
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( type & NETROM_MORE_FLAG ) ? ", More" : "",
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( type & NETROM_NAK_FLAG ) ? ", NAK" : "",
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( type & NETROM_CHOKE_FLAG ) ? ", Choke" : "",
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type );
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col_add_str( pinfo->cinfo, COL_INFO, info_buffer );
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if ( tree )
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{
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tc = proto_tree_add_uint_format( tree,
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hf_netrom_type_param,
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tvb,
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offset,
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1,
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type,
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"Type field: %s",
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info_buffer
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);
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type_tree = proto_item_add_subtree( tc, ett_netrom_type_param );
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proto_tree_add_item( type_tree, *type_items->hf_tf_op, tvb, offset, 1, ENC_BIG_ENDIAN );
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proto_tree_add_item( type_tree, *type_items->hf_tf_choke, tvb, offset, 1, ENC_BIG_ENDIAN );
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proto_tree_add_item( type_tree, *type_items->hf_tf_nak, tvb, offset, 1, ENC_BIG_ENDIAN );
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proto_tree_add_item( type_tree, *type_items->hf_tf_more, tvb, offset, 1, ENC_BIG_ENDIAN );
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}
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}
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static void
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dissect_netrom_proto(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *netrom_tree;
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int offset;
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#if 0
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guint8 src_ssid;
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guint8 dst_ssid;
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#endif
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guint8 op_code;
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guint8 cct_index;
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guint8 cct_id;
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tvbuff_t *next_tvb;
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col_set_str( pinfo->cinfo, COL_PROTOCOL, "NET/ROM" );
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col_clear( pinfo->cinfo, COL_INFO );
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offset = 0;
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/* source */
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set_address_tvb(&pinfo->dl_src, AT_AX25, AX25_ADDR_LEN, tvb, offset);
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set_address_tvb(&pinfo->src, AT_AX25, AX25_ADDR_LEN, tvb, offset);
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/* src_ssid = tvb_get_guint8(tvb, offset+6); */
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offset += AX25_ADDR_LEN; /* step over src addr */
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/* destination */
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set_address_tvb(&pinfo->dl_dst, AT_AX25, AX25_ADDR_LEN, tvb, offset);
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set_address_tvb(&pinfo->dst, AT_AX25, AX25_ADDR_LEN, tvb, offset);
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/* dst_ssid = tvb_get_guint8(tvb, offset+6); */
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offset += AX25_ADDR_LEN; /* step over dst addr */
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offset += 1; /* step over ttl */
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cct_index = tvb_get_guint8( tvb, offset );
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offset += 1; /* step over cct index*/
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cct_id = tvb_get_guint8( tvb, offset );
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offset += 1; /* step over cct id */
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offset += 1; /* step over n_s */
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offset += 1; /* step over n_r */
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/* frame type */
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op_code = tvb_get_guint8( tvb, offset ) & 0x0f;
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/*offset += 1;*/ /* step over op_code */
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col_add_fstr( pinfo->cinfo, COL_INFO, "%s", val_to_str_const( op_code, op_code_vals_text, "Unknown" ));
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/* if ( tree ) */
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{
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/* create display subtree for the protocol */
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ti = proto_tree_add_protocol_format( tree, proto_netrom, tvb, 0, NETROM_HEADER_SIZE,
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"NET/ROM, Src: %s, Dst: %s",
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address_to_str(wmem_packet_scope(), &pinfo->src),
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address_to_str(wmem_packet_scope(), &pinfo->dst));
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netrom_tree = proto_item_add_subtree( ti, ett_netrom );
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offset = 0;
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/* source */
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proto_tree_add_item( netrom_tree, hf_netrom_src, tvb, offset, AX25_ADDR_LEN, ENC_NA );
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offset += AX25_ADDR_LEN;
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/* destination */
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proto_tree_add_item( netrom_tree, hf_netrom_dst, tvb, offset, AX25_ADDR_LEN, ENC_NA );
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offset += AX25_ADDR_LEN;
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/* ttl */
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proto_tree_add_item( netrom_tree, hf_netrom_ttl, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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switch ( op_code )
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{
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case NETROM_PROTOEXT :
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/* cct index */
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proto_tree_add_item( netrom_tree, hf_netrom_my_cct_index, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* cct id */
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proto_tree_add_item( netrom_tree, hf_netrom_my_cct_id, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* unused */
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offset += 1;
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/* unused */
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offset += 1;
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break;
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case NETROM_CONNREQ :
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/* cct index */
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proto_tree_add_item( netrom_tree, hf_netrom_my_cct_index, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* cct id */
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proto_tree_add_item( netrom_tree, hf_netrom_my_cct_id, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* unused */
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offset += 1;
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/* unused */
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offset += 1;
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break;
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case NETROM_CONNACK :
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/* your cct index */
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proto_tree_add_item( netrom_tree, hf_netrom_your_cct_index, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* your cct id */
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proto_tree_add_item( netrom_tree, hf_netrom_your_cct_id, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* my cct index */
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proto_tree_add_item( netrom_tree, hf_netrom_my_cct_index, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* my cct id */
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proto_tree_add_item( netrom_tree, hf_netrom_my_cct_id, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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break;
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case NETROM_DISCREQ :
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/* your cct index */
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proto_tree_add_item( netrom_tree, hf_netrom_your_cct_index, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* your cct id */
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proto_tree_add_item( netrom_tree, hf_netrom_your_cct_id, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* unused */
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offset += 1;
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/* unused */
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offset += 1;
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break;
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case NETROM_DISCACK :
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/* your cct index */
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proto_tree_add_item( netrom_tree, hf_netrom_your_cct_index, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* your cct id */
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proto_tree_add_item( netrom_tree, hf_netrom_your_cct_id, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* unused */
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offset += 1;
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/* unused */
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offset += 1;
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break;
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case NETROM_INFO :
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/* your cct index */
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proto_tree_add_item( netrom_tree, hf_netrom_your_cct_index, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* your cct id */
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proto_tree_add_item( netrom_tree, hf_netrom_your_cct_id, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* n_s */
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proto_tree_add_item( netrom_tree, hf_netrom_n_s, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* n_r */
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proto_tree_add_item( netrom_tree, hf_netrom_n_r, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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break;
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case NETROM_INFOACK :
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/* your cct index */
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proto_tree_add_item( netrom_tree, hf_netrom_your_cct_index, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* your cct id */
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proto_tree_add_item( netrom_tree, hf_netrom_your_cct_id, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/* unused */
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offset += 1;
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/* n_r */
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proto_tree_add_item( netrom_tree, hf_netrom_n_r, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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break;
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default :
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offset += 1;
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offset += 1;
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offset += 1;
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offset += 1;
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break;
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}
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/* type */
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dissect_netrom_type( tvb,
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offset,
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pinfo,
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netrom_tree,
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hf_netrom_type,
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ett_netrom_type,
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&netrom_type_items
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);
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offset += 1;
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switch ( op_code )
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{
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case NETROM_PROTOEXT :
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break;
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case NETROM_CONNREQ :
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/* proposed window size */
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proto_tree_add_item( netrom_tree, hf_netrom_pwindow, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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proto_tree_add_item( netrom_tree, hf_netrom_user, tvb, offset, AX25_ADDR_LEN, ENC_NA );
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offset += AX25_ADDR_LEN;
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proto_tree_add_item( netrom_tree, hf_netrom_node, tvb, offset, AX25_ADDR_LEN, ENC_NA );
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offset += AX25_ADDR_LEN;
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break;
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case NETROM_CONNACK :
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/* accepted window size */
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proto_tree_add_item( netrom_tree, hf_netrom_awindow, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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break;
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case NETROM_DISCREQ :
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break;
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case NETROM_DISCACK :
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break;
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case NETROM_INFO :
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break;
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case NETROM_INFOACK :
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break;
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default :
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break;
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}
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}
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/* Call sub-dissectors here */
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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switch ( op_code )
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{
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case NETROM_PROTOEXT :
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if ( cct_index == NETROM_PROTO_IP && cct_id == NETROM_PROTO_IP )
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call_dissector( ip_handle , next_tvb, pinfo, tree );
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else
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call_data_dissector(next_tvb, pinfo, tree );
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break;
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case NETROM_INFO :
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default :
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call_data_dissector(next_tvb, pinfo, tree );
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break;
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}
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}
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static void
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dissect_netrom_routing(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tvbuff_t *next_tvb;
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const guint8* mnemonic;
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gint mnemonic_len;
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col_set_str( pinfo->cinfo, COL_PROTOCOL, "NET/ROM");
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col_set_str( pinfo->cinfo, COL_INFO, "routing table frame");
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if (tree)
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{
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proto_item *ti;
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proto_tree *netrom_tree;
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ti = proto_tree_add_item( tree, proto_netrom, tvb, 0, -1, ENC_NA);
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netrom_tree = proto_item_add_subtree( ti, ett_netrom );
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proto_tree_add_item_ret_string_and_length(netrom_tree, hf_netrom_mnemonic, tvb, 1, 6, ENC_ASCII|ENC_NA,
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wmem_packet_scope(), &mnemonic, &mnemonic_len);
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proto_item_append_text(ti, ", routing table frame, Node: %.6s", mnemonic);
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}
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next_tvb = tvb_new_subset_remaining(tvb, 7);
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|
call_data_dissector(next_tvb, pinfo, tree );
|
|
}
|
|
|
|
/* Code to actually dissect the packets */
|
|
static int
|
|
dissect_netrom(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
|
|
{
|
|
if ( tvb_get_guint8( tvb, 0 ) == 0xff )
|
|
dissect_netrom_routing( tvb, pinfo, tree );
|
|
else
|
|
dissect_netrom_proto( tvb, pinfo, tree );
|
|
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
static gboolean
|
|
capture_netrom( const guchar *pd _U_, int offset, int len, capture_packet_info_t *cpinfo _U_, const union wtap_pseudo_header *pseudo_header _U_)
|
|
{
|
|
if ( ! BYTES_ARE_IN_FRAME( offset, len, NETROM_MIN_SIZE ) )
|
|
return FALSE;
|
|
|
|
/* XXX - check for IP-over-NetROM here! */
|
|
return FALSE;
|
|
}
|
|
|
|
void
|
|
proto_register_netrom(void)
|
|
{
|
|
/* Setup list of header fields */
|
|
static hf_register_info hf[] = {
|
|
{ &hf_netrom_src,
|
|
{ "Source", "netrom.src",
|
|
FT_AX25, BASE_NONE, NULL, 0x0,
|
|
"Source callsign", HFILL }
|
|
},
|
|
{ &hf_netrom_dst,
|
|
{ "Destination", "netrom.dst",
|
|
FT_AX25, BASE_NONE, NULL, 0x0,
|
|
"Destination callsign", HFILL }
|
|
},
|
|
{ &hf_netrom_ttl,
|
|
{ "TTL", "netrom.ttl",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_netrom_my_cct_index,
|
|
{ "My circuit index", "netrom.my.cct.index",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_netrom_my_cct_id,
|
|
{ "My circuit ID", "netrom.my.cct.id",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_netrom_your_cct_index,
|
|
{ "Your circuit index", "netrom.your.cct.index",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_netrom_your_cct_id,
|
|
{ "Your circuit ID", "netrom.your.cct.id",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_netrom_n_r,
|
|
{ "N(r)", "netrom.n_r",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_netrom_n_s,
|
|
{ "N(s)", "netrom.n_s",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_netrom_type,
|
|
{ "Type", "netrom.type",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
"Packet type field", HFILL }
|
|
},
|
|
{ &hf_netrom_op,
|
|
{ "OP code", "netrom.op",
|
|
FT_UINT8, BASE_HEX, VALS( op_code_vals_abbrev ), 0x0f,
|
|
"Protocol operation code", HFILL }
|
|
},
|
|
{ &hf_netrom_more,
|
|
{ "More", "netrom.flag.more",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), NETROM_MORE_FLAG,
|
|
"More flag", HFILL }
|
|
},
|
|
{ &hf_netrom_nak,
|
|
{ "NAK", "netrom.flag.nak",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), NETROM_NAK_FLAG,
|
|
"NAK flag", HFILL }
|
|
},
|
|
{ &hf_netrom_choke,
|
|
{ "Choke", "netrom.flag.choke",
|
|
FT_BOOLEAN, 8, TFS(&tfs_set_notset), NETROM_CHOKE_FLAG,
|
|
"Choke flag", HFILL }
|
|
},
|
|
{ &hf_netrom_user,
|
|
{ "User", "netrom.user",
|
|
FT_AX25, BASE_NONE, NULL, 0x0,
|
|
"User callsign", HFILL }
|
|
},
|
|
{ &hf_netrom_node,
|
|
{ "Node", "netrom.node",
|
|
FT_AX25, BASE_NONE, NULL, 0x0,
|
|
"Node callsign", HFILL }
|
|
},
|
|
{ &hf_netrom_pwindow,
|
|
{ "Window", "netrom.pwindow",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Proposed window", HFILL }
|
|
},
|
|
{ &hf_netrom_awindow,
|
|
{ "Window", "netrom.awindow",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Accepted window", HFILL }
|
|
},
|
|
{ &hf_netrom_mnemonic,
|
|
{ "Node name", "netrom.name",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_netrom,
|
|
&ett_netrom_type,
|
|
};
|
|
|
|
/* Register the protocol name and description */
|
|
proto_netrom = proto_register_protocol( "Amateur Radio NET/ROM", "NET/ROM", "netrom" );
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array( proto_netrom, hf, array_length(hf ) );
|
|
proto_register_subtree_array( ett, array_length( ett ) );
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_netrom(void)
|
|
{
|
|
capture_dissector_handle_t netrom_cap_handle;
|
|
|
|
dissector_add_uint( "ax25.pid", AX25_P_NETROM, create_dissector_handle( dissect_netrom, proto_netrom ) );
|
|
netrom_cap_handle = create_capture_dissector_handle(capture_netrom, proto_netrom);
|
|
capture_dissector_add_uint("ax25.pid", AX25_P_NETROM, netrom_cap_handle);
|
|
|
|
ip_handle = find_dissector_add_dependency( "ip", proto_netrom );
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|