Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 428 insertions, 0 deletions

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 <ethereal@fales-lorenz.net>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/capture_dissectors.h>
+#include <epan/address_types.h>
+#include <epan/arcnet_pids.h>
+#include <epan/to_str.h>
+#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:
+ */