From e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 10 Apr 2024 22:34:10 +0200 Subject: Adding upstream version 4.2.2. Signed-off-by: Daniel Baumann --- epan/dissectors/packet-arcnet.c | 428 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 428 insertions(+) create mode 100644 epan/dissectors/packet-arcnet.c (limited to 'epan/dissectors/packet-arcnet.c') diff --git a/epan/dissectors/packet-arcnet.c b/epan/dissectors/packet-arcnet.c new file mode 100644 index 00000000..c774f819 --- /dev/null +++ b/epan/dissectors/packet-arcnet.c @@ -0,0 +1,428 @@ +/* packet-arcnet.c + * Routines for arcnet dissection + * Copyright 2001-2002, Peter Fales + * + * Wireshark - Network traffic analyzer + * By Gerald Combs + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "config.h" + +#include +#include +#include +#include +#include +#include "packet-ip.h" +#include "packet-arp.h" + +void proto_register_arcnet(void); +void proto_reg_handoff_arcnet(void); + +static dissector_handle_t arcnet_handle; +static dissector_handle_t arcnet_linux_handle; +static capture_dissector_handle_t arcnet_cap_handle; +static capture_dissector_handle_t arcnet_cap_has_ex_handle; + +/* Initialize the protocol and registered fields */ +static int proto_arcnet = -1; +static int hf_arcnet_src = -1; +static int hf_arcnet_dst = -1; +static int hf_arcnet_offset = -1; +static int hf_arcnet_protID = -1; +static int hf_arcnet_exception_flag = -1; +static int hf_arcnet_split_flag = -1; +static int hf_arcnet_sequence = -1; +static int hf_arcnet_padding = -1; + +/* Initialize the subtree pointers */ +static gint ett_arcnet = -1; + +static int arcnet_address_type = -1; + +static dissector_table_t arcnet_dissector_table; + +static capture_dissector_handle_t ip_cap_handle; +static capture_dissector_handle_t arp_cap_handle; + +/* Cache protocol for packet counting */ +static int proto_ipx = -1; + +static int arcnet_str_len(const address* addr _U_) +{ + return 5; +} + +static int arcnet_to_str(const address* addr, gchar *buf, int buf_len _U_) +{ + *buf++ = '0'; + *buf++ = 'x'; + buf = bytes_to_hexstr(buf, (const guint8 *)addr->data, 1); + *buf = '\0'; /* NULL terminate */ + + return arcnet_str_len(addr); +} + +static const char* arcnet_col_filter_str(const address* addr _U_, gboolean is_src) +{ + if (is_src) + return "arcnet.src"; + + return "arcnet.dst"; +} + +static int arcnet_len(void) +{ + return 1; +} + +static gboolean +capture_arcnet_common(const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header, gboolean has_exception) +{ + if (!BYTES_ARE_IN_FRAME(offset, len, 1)) { + return FALSE; + } + + switch (pd[offset]) { + + case ARCNET_PROTO_IP_1051: + /* No fragmentation stuff in the header */ + return call_capture_dissector(ip_cap_handle, pd, offset + 1, len, cpinfo, pseudo_header); + + case ARCNET_PROTO_IP_1201: + /* + * There's fragmentation stuff in the header. + * + * XXX - on at least some versions of NetBSD, it appears that we + * might we get ARCNET frames, not reassembled packets; we should + * perhaps bump "counts->other" for all but the first frame of a packet. + * + * XXX - but on FreeBSD it appears that we get reassembled packets + * on input (but apparently we get frames on output - or maybe + * we get the packet *and* all its frames!); how to tell the + * difference? It looks from the FreeBSD reassembly code as if + * the reassembled packet arrives with the header for the first + * frame. It also looks as if, on output, we first get the + * full packet, with a header containing none of the fragmentation + * stuff, and then get the frames. + * + * On Linux, we get only reassembled packets, and the exception + * frame stuff is hidden - there's a split flag and sequence + * number, but it appears that it will never have the exception + * frame stuff. + * + * XXX - what about OpenBSD? And, for that matter, what about + * Windows? (I suspect Windows supplies reassembled frames, + * as WinPcap, like PF_PACKET sockets, taps into the networking + * stack just as other protocols do.) + */ + offset++; + if (!BYTES_ARE_IN_FRAME(offset, len, 1)) { + return FALSE; + } + if (has_exception && pd[offset] == 0xff) { + /* This is an exception packet. The flag value there is the + "this is an exception flag" packet; the next two bytes + after it are padding, and another copy of the packet + type appears after the padding. */ + offset += 4; + } + return call_capture_dissector(ip_cap_handle, pd, offset + 3, len, cpinfo, pseudo_header); + + case ARCNET_PROTO_ARP_1051: + case ARCNET_PROTO_ARP_1201: + /* + * XXX - do we have to worry about fragmentation for ARP? + */ + return call_capture_dissector(arp_cap_handle, pd, offset + 1, len, cpinfo, pseudo_header); + + case ARCNET_PROTO_IPX: + capture_dissector_increment_count(cpinfo, proto_ipx); + break; + + default: + return FALSE; + } + + return TRUE; +} + +static gboolean +capture_arcnet (const guchar *pd, int offset _U_, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header) +{ + return capture_arcnet_common(pd, 4, len, cpinfo, pseudo_header, FALSE); +} + +static gboolean +capture_arcnet_has_exception(const guchar *pd, int offset _U_, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header) +{ + return capture_arcnet_common(pd, 2, len, cpinfo, pseudo_header, TRUE); +} + +static void +dissect_arcnet_common (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, + gboolean has_offset, gboolean has_exception) +{ + int offset = 0; + guint8 dst, src, protID, split_flag; + tvbuff_t *next_tvb; + proto_item *ti; + proto_tree *arcnet_tree; + + col_set_str (pinfo->cinfo, COL_PROTOCOL, "ARCNET"); + + col_set_str(pinfo->cinfo, COL_INFO, "ARCNET"); + + src = tvb_get_guint8 (tvb, 0); + dst = tvb_get_guint8 (tvb, 1); + set_address_tvb(&pinfo->dl_src, arcnet_address_type, 1, tvb, 0); + copy_address_shallow(&pinfo->src, &pinfo->dl_src); + set_address_tvb(&pinfo->dl_dst, arcnet_address_type, 1, tvb, 1); + copy_address_shallow(&pinfo->dst, &pinfo->dl_dst); + + ti = proto_tree_add_item (tree, proto_arcnet, tvb, 0, -1, ENC_NA); + + arcnet_tree = proto_item_add_subtree (ti, ett_arcnet); + + proto_tree_add_uint (arcnet_tree, hf_arcnet_src, tvb, offset, 1, src); + offset++; + + proto_tree_add_uint (arcnet_tree, hf_arcnet_dst, tvb, offset, 1, dst); + offset++; + + if (has_offset) { + proto_tree_add_item (arcnet_tree, hf_arcnet_offset, tvb, offset, 2, ENC_NA); + offset += 2; + } + + protID = tvb_get_guint8 (tvb, offset); + proto_tree_add_uint (arcnet_tree, hf_arcnet_protID, tvb, offset, 1, protID); + offset++; + + switch (protID) { + + case ARCNET_PROTO_IP_1051: + case ARCNET_PROTO_ARP_1051: + case ARCNET_PROTO_DIAGNOSE: + case ARCNET_PROTO_BACNET: /* XXX - no fragmentation? */ + /* No fragmentation stuff in the header */ + break; + + default: + /* + * Show the fragmentation stuff - flag and sequence ID. + * + * XXX - on at least some versions of NetBSD, it appears that + * we might get ARCNET frames, not reassembled packets; if so, + * we should reassemble them. + * + * XXX - but on FreeBSD it appears that we get reassembled packets + * on input (but apparently we get frames on output - or maybe + * we get the packet *and* all its frames!); how to tell the + * difference? It looks from the FreeBSD reassembly code as if + * the reassembled packet arrives with the header for the first + * frame. It also looks as if, on output, we first get the + * full packet, with a header containing none of the fragmentation + * stuff, and then get the frames. + * + * On Linux, we get only reassembled packets, and the exception + * frame stuff is hidden - there's a split flag and sequence + * number, but it appears that it will never have the exception + * frame stuff. + * + * XXX - what about OpenBSD? And, for that matter, what about + * Windows? (I suspect Windows supplies reassembled frames, + * as WinPcap, like PF_PACKET sockets, taps into the networking + * stack just as other protocols do.) + */ + split_flag = tvb_get_guint8 (tvb, offset); + if (has_exception && split_flag == 0xff) { + /* This is an exception packet. The flag value there is the + "this is an exception flag" packet; the next two bytes + after it are padding. */ + proto_tree_add_uint (arcnet_tree, hf_arcnet_exception_flag, tvb, offset, 1, + split_flag); + offset++; + + proto_tree_add_item(arcnet_tree, hf_arcnet_padding, tvb, offset, 2, ENC_BIG_ENDIAN); + offset += 2; + + /* Another copy of the packet type appears after the padding. */ + proto_tree_add_item (arcnet_tree, hf_arcnet_protID, tvb, offset, 1, ENC_BIG_ENDIAN); + offset++; + + /* And after that comes the real split flag. */ + split_flag = tvb_get_guint8 (tvb, offset); + } + + proto_tree_add_uint (arcnet_tree, hf_arcnet_split_flag, tvb, offset, 1, + split_flag); + offset++; + + proto_tree_add_item (arcnet_tree, hf_arcnet_sequence, tvb, offset, 2, ENC_BIG_ENDIAN); + offset += 2; + + break; + } + + /* Set the length of the ARCNET header protocol tree item. */ + proto_item_set_len(ti, offset); + + next_tvb = tvb_new_subset_remaining (tvb, offset); + + if (!dissector_try_uint (arcnet_dissector_table, protID, + next_tvb, pinfo, tree)) + { + col_add_fstr (pinfo->cinfo, COL_PROTOCOL, "0x%04x", protID); + call_data_dissector(next_tvb, pinfo, tree); + } + +} + +/* + * BSD-style ARCNET headers - they don't have the offset field from the + * ARCNET hardware packet, but we might get an exception frame header. + */ +static int +dissect_arcnet (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_) +{ + dissect_arcnet_common (tvb, pinfo, tree, FALSE, TRUE); + return tvb_captured_length(tvb); +} + +/* + * Linux-style ARCNET headers - they *do* have the offset field from the + * ARCNET hardware packet, but we should never see an exception frame + * header. + */ +static int +dissect_arcnet_linux (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_) +{ + dissect_arcnet_common (tvb, pinfo, tree, TRUE, FALSE); + return tvb_captured_length(tvb); +} + +static const value_string arcnet_prot_id_vals[] = { + {ARCNET_PROTO_IP_1051, "RFC 1051 IP"}, + {ARCNET_PROTO_ARP_1051, "RFC 1051 ARP"}, + {ARCNET_PROTO_IP_1201, "RFC 1201 IP"}, + {ARCNET_PROTO_ARP_1201, "RFC 1201 ARP"}, + {ARCNET_PROTO_RARP_1201, "RFC 1201 RARP"}, + {ARCNET_PROTO_IPX, "IPX"}, + {ARCNET_PROTO_NOVELL_EC, "Novell of some sort"}, + {ARCNET_PROTO_IPv6, "IPv6"}, + {ARCNET_PROTO_ETHERNET, "Encapsulated Ethernet"}, + {ARCNET_PROTO_DATAPOINT_BOOT, "Datapoint boot"}, + {ARCNET_PROTO_DATAPOINT_MOUNT, "Datapoint mount"}, + {ARCNET_PROTO_POWERLAN_BEACON, "PowerLAN beacon"}, + {ARCNET_PROTO_POWERLAN_BEACON2, "PowerLAN beacon2"}, + {ARCNET_PROTO_APPLETALK, "Appletalk"}, + {ARCNET_PROTO_BANYAN, "Banyan VINES"}, + {ARCNET_PROTO_DIAGNOSE, "Diagnose"}, + {ARCNET_PROTO_BACNET, "BACnet"}, + {0, NULL} +}; + +void +proto_register_arcnet (void) +{ + +/* Setup list of header fields See Section 1.6.1 for details*/ + static hf_register_info hf[] = { + {&hf_arcnet_src, + {"Source", "arcnet.src", + FT_UINT8, BASE_HEX, NULL, 0, + "Source ID", HFILL} + }, + {&hf_arcnet_dst, + {"Dest", "arcnet.dst", + FT_UINT8, BASE_HEX, NULL, 0, + "Dest ID", HFILL} + }, + {&hf_arcnet_offset, + {"Offset", "arcnet.offset", + FT_BYTES, BASE_NONE, NULL, 0, + NULL, HFILL} + }, + {&hf_arcnet_protID, + {"Protocol ID", "arcnet.protID", + FT_UINT8, BASE_HEX, VALS(arcnet_prot_id_vals), 0, + "Proto type", HFILL} + }, + {&hf_arcnet_split_flag, + {"Split Flag", "arcnet.split_flag", + FT_UINT8, BASE_DEC, NULL, 0, + NULL, HFILL} + }, + {&hf_arcnet_exception_flag, + {"Exception Flag", "arcnet.exception_flag", + FT_UINT8, BASE_HEX, NULL, 0, + NULL, HFILL} + }, + {&hf_arcnet_sequence, + {"Sequence", "arcnet.sequence", + FT_UINT16, BASE_DEC, NULL, 0, + "Sequence number", HFILL} + }, + {&hf_arcnet_padding, + {"Padding", "arcnet.padding", + FT_UINT16, BASE_HEX, NULL, 0, + NULL, HFILL} + }, + }; + +/* Setup protocol subtree array */ + static gint *ett[] = { + &ett_arcnet, + }; + +/* Register the protocol name and description */ + proto_arcnet = proto_register_protocol ("ARCNET", "ARCNET", "arcnet"); + +/* Required function calls to register the header fields and subtrees used */ + proto_register_field_array (proto_arcnet, hf, array_length (hf)); + proto_register_subtree_array (ett, array_length (ett)); + + arcnet_dissector_table = register_dissector_table ("arcnet.protocol_id", "ARCNET Protocol ID", + proto_arcnet, FT_UINT8, BASE_HEX); + + arcnet_address_type = address_type_dissector_register("AT_ARCNET", "ARCNET Address", arcnet_to_str, arcnet_str_len, NULL, arcnet_col_filter_str, arcnet_len, NULL, NULL); + + arcnet_handle = register_dissector("arcnet", dissect_arcnet, proto_arcnet); + arcnet_linux_handle = register_dissector("arcnet_linux", dissect_arcnet_linux, proto_arcnet); + + arcnet_cap_handle = register_capture_dissector("arcnet_linux", capture_arcnet, proto_arcnet); + arcnet_cap_has_ex_handle = register_capture_dissector("arcnet", capture_arcnet_has_exception, proto_arcnet); +} + + +void +proto_reg_handoff_arcnet (void) +{ + dissector_add_uint ("wtap_encap", WTAP_ENCAP_ARCNET, arcnet_handle); + dissector_add_uint ("wtap_encap", WTAP_ENCAP_ARCNET_LINUX, arcnet_linux_handle); + + proto_ipx = proto_get_id_by_filter_name("ipx"); + + capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_ARCNET_LINUX, arcnet_cap_handle); + capture_dissector_add_uint("wtap_encap", WTAP_ENCAP_ARCNET, arcnet_cap_has_ex_handle); + + ip_cap_handle = find_capture_dissector("ip"); + arp_cap_handle = find_capture_dissector("arp"); +} + +/* + * Editor modelines - https://www.wireshark.org/tools/modelines.html + * + * Local Variables: + * c-basic-offset: 2 + * tab-width: 8 + * indent-tabs-mode: nil + * End: + * + * ex: set shiftwidth=2 tabstop=8 expandtab: + * :indentSize=2:tabSize=8:noTabs=true: + */ -- cgit v1.2.3