1 /* packet-ap1394.c
2 * Routines for Apple IP-over-IEEE 1394 packet disassembly
3 *
4 * Wireshark - Network traffic analyzer
5 * By Gerald Combs <gerald@wireshark.org>
6 * Copyright 1998 Gerald Combs
7 *
8 * SPDX-License-Identifier: GPL-2.0-or-later
9 */
10
11 #include "config.h"
12
13 #include <epan/packet.h>
14 #include <epan/capture_dissectors.h>
15 #include <wsutil/pint.h>
16 #include <epan/addr_resolv.h>
17
18 #include <epan/etypes.h>
19
20 void proto_register_ap1394(void);
21 void proto_reg_handoff_ap1394(void);
22
23 static int proto_ap1394 = -1;
24 static int hf_ap1394_dst = -1;
25 static int hf_ap1394_src = -1;
26 static int hf_ap1394_type = -1;
27
28 static gint ett_ap1394 = -1;
29
30 static dissector_table_t ethertype_subdissector_table;
31
32 static gboolean
capture_ap1394(const guchar * pd,int offset,int len,capture_packet_info_t * cpinfo,const union wtap_pseudo_header * pseudo_header)33 capture_ap1394(const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header)
34 {
35 guint16 etype;
36
37 if (!BYTES_ARE_IN_FRAME(offset, len, 18)) {
38 return FALSE;
39 }
40
41 /* Skip destination and source addresses */
42 offset += 16;
43
44 etype = pntoh16(&pd[offset]);
45 offset += 2;
46 return try_capture_dissector("ethertype", etype, pd, offset, len, cpinfo, pseudo_header);
47 }
48
49 static int
dissect_ap1394(tvbuff_t * tvb,packet_info * pinfo,proto_tree * tree,void * data _U_)50 dissect_ap1394(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
51 {
52 proto_item *ti;
53 proto_tree *fh_tree = NULL;
54 guint16 etype;
55 tvbuff_t *next_tvb;
56
57 col_set_str(pinfo->cinfo, COL_PROTOCOL, "IP/IEEE1394");
58 col_clear(pinfo->cinfo, COL_INFO);
59
60 set_address_tvb(&pinfo->dl_src, AT_EUI64, 8, tvb, 8);
61 copy_address_shallow(&pinfo->src, &pinfo->dl_src);
62 set_address_tvb(&pinfo->dl_dst, AT_EUI64, 8, tvb, 0);
63 copy_address_shallow(&pinfo->dst, &pinfo->dl_dst);
64
65 if (tree) {
66 ti = proto_tree_add_protocol_format(tree, proto_ap1394, tvb, 0, 18,
67 "Apple IP-over-IEEE 1394, Src: %s, Dst: %s",
68 address_to_str(pinfo->pool, &pinfo->src), address_to_str(pinfo->pool, &pinfo->dst));
69 fh_tree = proto_item_add_subtree(ti, ett_ap1394);
70 proto_tree_add_item(fh_tree, hf_ap1394_dst, tvb, 0, 8, ENC_NA);
71 proto_tree_add_item(fh_tree, hf_ap1394_src, tvb, 8, 8, ENC_NA);
72 }
73 etype = tvb_get_ntohs(tvb, 16);
74 proto_tree_add_uint(fh_tree, hf_ap1394_type, tvb, 16, 2, etype);
75 next_tvb = tvb_new_subset_remaining(tvb, 18);
76 if (!dissector_try_uint(ethertype_subdissector_table, etype, next_tvb,
77 pinfo, tree))
78 {
79 call_data_dissector(next_tvb, pinfo, tree);
80 }
81 return tvb_captured_length(tvb);
82 }
83
84 void
proto_register_ap1394(void)85 proto_register_ap1394(void)
86 {
87 static hf_register_info hf[] = {
88 { &hf_ap1394_dst,
89 { "Destination", "ap1394.dst", FT_BYTES, BASE_NONE,
90 NULL, 0x0, "Destination address", HFILL }},
91 { &hf_ap1394_src,
92 { "Source", "ap1394.src", FT_BYTES, BASE_NONE,
93 NULL, 0x0, "Source address", HFILL }},
94 /* registered here but handled in ethertype.c */
95 { &hf_ap1394_type,
96 { "Type", "ap1394.type", FT_UINT16, BASE_HEX,
97 VALS(etype_vals), 0x0, NULL, HFILL }},
98 };
99 static gint *ett[] = {
100 &ett_ap1394,
101 };
102
103 proto_ap1394 = proto_register_protocol("Apple IP-over-IEEE 1394", "IP/IEEE1394", "ap1394");
104 proto_register_field_array(proto_ap1394, hf, array_length(hf));
105 proto_register_subtree_array(ett, array_length(ett));
106 }
107
108 void
proto_reg_handoff_ap1394(void)109 proto_reg_handoff_ap1394(void)
110 {
111 dissector_handle_t ap1394_handle;
112 capture_dissector_handle_t ap1394_cap_handle;
113
114 ethertype_subdissector_table = find_dissector_table("ethertype");
115
116 ap1394_handle = create_dissector_handle(dissect_ap1394, proto_ap1394);
117 dissector_add_uint("wtap_encap", WTAP_ENCAP_APPLE_IP_OVER_IEEE1394, ap1394_handle);
118
119 ap1394_cap_handle = create_capture_dissector_handle(capture_ap1394, proto_ap1394);
120 capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_APPLE_IP_OVER_IEEE1394, ap1394_cap_handle);
121 }
122
123 /*
124 * Editor modelines - https://www.wireshark.org/tools/modelines.html
125 *
126 * Local Variables:
127 * c-basic-offset: 2
128 * tab-width: 8
129 * indent-tabs-mode: nil
130 * End:
131 *
132 * ex: set shiftwidth=2 tabstop=8 expandtab:
133 * :indentSize=2:tabSize=8:noTabs=true:
134 */
135