diff options
Diffstat (limited to 'epan/dissectors/packet-bpq.c')
| -rw-r--r-- | epan/dissectors/packet-bpq.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/epan/dissectors/packet-bpq.c b/epan/dissectors/packet-bpq.c new file mode 100644 index 00000000..3f72de54 --- /dev/null +++ b/epan/dissectors/packet-bpq.c @@ -0,0 +1,160 @@ +/* packet-bpq.c + * + * Routines for Amateur Packet Radio protocol dissection + * Copyright 2005,2006,2007,2008,2009,2010,2012 R.W. Stearn <richard@rns-stearn.demon.co.uk> + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +/* + * This dissector is for: + * Ethernet encapsulated Amateur AX.25 (AX.25 over Ethernet) + * + * Information was drawn from: + * ? + * + * It uses Ether ID 0x08ff which is not officially registered. + * + */ + +#include "config.h" + +#include <epan/packet.h> +#include <epan/etypes.h> +#include <epan/capture_dissectors.h> + +#define STRLEN 80 + +#define BPQ_HEADER_SIZE 2 /* length of bpq_len */ + +void proto_register_bpq(void); +void proto_reg_handoff_bpq(void); + +static dissector_handle_t bpq_handle; +static dissector_handle_t ax25_handle; + +static capture_dissector_handle_t ax25_cap_handle; + +static int proto_bpq = -1; +static int hf_bpq_len = -1; + +static gint ett_bpq = -1; + +static int +dissect_bpq( tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_ ) +{ + proto_item *ti; + proto_tree *bpq_tree; + int offset; + guint16 bpq_len; + tvbuff_t *next_tvb; + + + col_set_str( pinfo->cinfo, COL_PROTOCOL, "BPQ" ); + + col_clear( pinfo->cinfo, COL_INFO ); + + /* protocol offset for the BPQ header */ + offset = 0; + + bpq_len = tvb_get_letohs( tvb, offset ); + + col_add_fstr( pinfo->cinfo, COL_INFO, "%u", bpq_len ); + + if ( parent_tree ) + { + /* protocol offset for the BPQ header */ + offset = 0; + + /* create display subtree for the protocol */ + ti = proto_tree_add_protocol_format( parent_tree, proto_bpq, tvb, offset, BPQ_HEADER_SIZE, + "BPQ, Len: %u", + bpq_len & 0xfff /* XXX - lower 12 bits? */ + ); + + bpq_tree = proto_item_add_subtree( ti, ett_bpq ); + + proto_tree_add_item( bpq_tree, hf_bpq_len, tvb, offset, BPQ_HEADER_SIZE, ENC_LITTLE_ENDIAN ); + + } + + offset += BPQ_HEADER_SIZE; + + /* XXX - use the length */ + next_tvb = tvb_new_subset_remaining( tvb, offset ); + call_dissector( ax25_handle, next_tvb, pinfo, parent_tree ); + return tvb_captured_length(tvb); +} + +static gboolean +capture_bpq( const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header) +{ + int l_offset; + + if ( ! BYTES_ARE_IN_FRAME( offset, len, BPQ_HEADER_SIZE ) ) + return FALSE; + + l_offset = offset; + l_offset += BPQ_HEADER_SIZE; /* step over bpq header to point at the AX.25 packet*/ + return call_capture_dissector( ax25_cap_handle, pd, l_offset, len, cpinfo, pseudo_header ); +} + +void +proto_register_bpq(void) +{ + /* Setup list of header fields */ + static hf_register_info hf[] = { + { &hf_bpq_len, + { "BPQ len", "bpq.len", + FT_UINT16, BASE_DEC, NULL, 0x0, + NULL, HFILL } + }, + }; + + /* Setup protocol subtree array */ + static gint *ett[] = { + &ett_bpq, + }; + + /* Register the protocol name and description */ + proto_bpq = proto_register_protocol( "Amateur Radio BPQ", "BPQ", "bpq" ); + + /* Register the dissector */ + bpq_handle = register_dissector("bpq", dissect_bpq, proto_bpq); + + /* Required function calls to register the header fields and subtrees used */ + proto_register_field_array( proto_bpq, hf, array_length( hf ) ); + proto_register_subtree_array( ett, array_length( ett ) ); +} + +void +proto_reg_handoff_bpq(void) +{ + capture_dissector_handle_t bpq_cap_handle; + + dissector_add_uint("ethertype", ETHERTYPE_BPQ, bpq_handle); + bpq_cap_handle = create_capture_dissector_handle(capture_bpq, proto_bpq); + capture_dissector_add_uint("ethertype", ETHERTYPE_BPQ, bpq_cap_handle); + + /* BPQ is only implemented for AX.25 */ + ax25_handle = find_dissector_add_dependency( "ax25", proto_bpq ); + + ax25_cap_handle = find_capture_dissector( "ax25" ); +} + +/* + * Editor modelines - https://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: + */ |