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-rw-r--r--epan/dissectors/packet-bzr.c333
1 files changed, 333 insertions, 0 deletions
diff --git a/epan/dissectors/packet-bzr.c b/epan/dissectors/packet-bzr.c
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--- /dev/null
+++ b/epan/dissectors/packet-bzr.c
@@ -0,0 +1,333 @@
+/* packet-bzr.c
+ * Routines for Bazaar packet dissection
+ * Copyright 2011,2013 Jelmer Vernooij <jelmer@samba.org>
+ *
+ * http://doc.bazaar.canonical.com/developers/network-protocol.html
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * Copied from packet-pop.c
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/prefs.h>
+
+void proto_register_bzr(void);
+void proto_reg_handoff_bzr(void);
+
+static int proto_bzr = -1;
+
+static gint ett_bzr = -1;
+static gint ett_prefixed_bencode = -1;
+static gint ett_prefixed_bytes = -1;
+
+static gint hf_bzr_prefixed_bencode = -1;
+static gint hf_bzr_prefixed_bencode_len = -1;
+static gint hf_bzr_bytes = -1;
+static gint hf_bzr_bytes_data = -1;
+static gint hf_bzr_bytes_length = -1;
+static gint hf_bzr_result = -1;
+static gint hf_bzr_packet_protocol_version = -1;
+static gint hf_bzr_packet_kind = -1;
+
+static dissector_handle_t bencode_handle;
+static dissector_handle_t bzr_handle = NULL;
+
+#define REQUEST_VERSION_TWO "bzr request 2\n"
+#define RESPONSE_VERSION_TWO "bzr response 2\n"
+#define MESSAGE_VERSION_THREE "bzr message 3 (bzr 1.6)\n"
+
+#define TCP_PORT_BZR 4155
+
+static const value_string message_part_kind[] = {
+ {'s', "Structure"},
+ {'b', "Bytes"},
+ {'o', "Single byte"},
+ {'e', "End"},
+ {0, NULL}
+};
+
+static const value_string message_results[] = {
+ {'S', "Success"},
+ {'E', "Error"},
+ {0, NULL}
+};
+
+/* desegmentation of Bazaar over TCP */
+static gboolean bzr_desegment = TRUE;
+
+static guint get_bzr_prefixed_len(tvbuff_t *tvb, int offset)
+{
+ guint header_len;
+ header_len = tvb_get_ntohl(tvb, offset);
+ return 4 + header_len;
+}
+
+static guint
+get_bzr_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
+{
+ int next_offset;
+ gint len = 0, current_len;
+ gint protocol_version_len;
+ guint8 cmd = 0;
+
+ /* Protocol version */
+ protocol_version_len = tvb_find_line_end(tvb, offset, -1, &next_offset,
+ TRUE);
+ if (protocol_version_len == -1) /* End of the packet not seen yet */
+ return -1;
+
+ len += protocol_version_len + 1;
+
+ /* Headers */
+ current_len = len;
+ len += get_bzr_prefixed_len(tvb, next_offset);
+ if (current_len > len) /* Make sure we're not going backwards */
+ return -1;
+
+ while (tvb_reported_length_remaining(tvb, offset + len) > 0) {
+ cmd = tvb_get_guint8(tvb, offset + len);
+ len += 1;
+
+ switch (cmd) {
+ case 's':
+ case 'b':
+ current_len = len;
+ len += get_bzr_prefixed_len(tvb, offset + len);
+ if (current_len > len) /* Make sure we're not going backwards */
+ return -1;
+ break;
+ case 'o':
+ len += 1;
+ break;
+ case 'e':
+ return len;
+ }
+ }
+
+ return -1;
+}
+
+static gint
+dissect_prefixed_bencode(tvbuff_t *tvb, gint offset, packet_info *pinfo,
+ proto_tree *tree)
+{
+ guint32 plen;
+ proto_tree *prefixed_bencode_tree;
+ proto_item *ti;
+ tvbuff_t *subtvb;
+
+ plen = tvb_get_ntohl(tvb, offset);
+
+ ti = proto_tree_add_item(tree, hf_bzr_prefixed_bencode, tvb, offset, -1,
+ ENC_NA);
+ prefixed_bencode_tree = proto_item_add_subtree(ti, ett_prefixed_bencode);
+
+ proto_tree_add_item(prefixed_bencode_tree, hf_bzr_prefixed_bencode_len,
+ tvb, offset, 4, ENC_BIG_ENDIAN);
+
+ subtvb = tvb_new_subset_length(tvb, offset+4, plen);
+ call_dissector(bencode_handle, subtvb, pinfo, prefixed_bencode_tree);
+
+ proto_item_set_len(ti, 4 + plen);
+
+ return 4 + plen;
+}
+
+static gint
+dissect_prefixed_bytes(tvbuff_t *tvb, gint offset, packet_info *pinfo _U_,
+ proto_tree *tree)
+{
+ guint32 plen;
+ proto_tree *prefixed_bytes_tree;
+ proto_item *ti;
+
+ plen = tvb_get_ntohl(tvb, offset);
+
+ ti = proto_tree_add_item(tree, hf_bzr_bytes, tvb, offset, -1, ENC_NA);
+ prefixed_bytes_tree = proto_item_add_subtree(ti, ett_prefixed_bytes);
+
+ proto_tree_add_item(prefixed_bytes_tree, hf_bzr_bytes_length,
+ tvb, offset, 4, ENC_BIG_ENDIAN);
+
+ proto_tree_add_item(prefixed_bytes_tree, hf_bzr_bytes_data,
+ tvb, offset+4, plen, ENC_NA);
+
+ proto_item_set_len(ti, 4 + plen);
+
+ return 4 + plen;
+}
+
+static gint
+dissect_body(tvbuff_t *tvb, gint offset, packet_info *pinfo, proto_tree *tree)
+{
+ guint8 cmd = 0;
+
+ while (tvb_reported_length_remaining(tvb, offset) > 0) {
+ cmd = tvb_get_guint8(tvb, offset);
+ proto_tree_add_item(tree, hf_bzr_packet_kind, tvb, offset, 1, ENC_ASCII|ENC_NA);
+ offset += 1;
+
+ switch (cmd) {
+ case 's':
+ offset += dissect_prefixed_bencode(tvb, offset, pinfo, tree);
+ break;
+ case 'b':
+ offset += dissect_prefixed_bytes(tvb, offset, pinfo, tree);
+ break;
+ case 'o':
+ proto_tree_add_item(tree, hf_bzr_result, tvb, offset, 1,
+ ENC_ASCII|ENC_NA);
+ offset += 1;
+ break;
+ case 'e':
+ break;
+ }
+ }
+
+ return offset;
+}
+
+static void
+dissect_bzr_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ proto_tree *bzr_tree;
+ proto_item *ti;
+ int offset = 0;
+ gint protocol_version_len;
+
+ ti = proto_tree_add_item(tree, proto_bzr, tvb, offset, -1, ENC_NA);
+ bzr_tree = proto_item_add_subtree(ti, ett_bzr);
+
+ protocol_version_len = tvb_find_line_end(tvb, offset, -1, &offset, TRUE);
+ if (protocol_version_len == -1) /* Invalid packet */
+ return;
+
+ if (bzr_tree)
+ {
+ proto_tree_add_item(bzr_tree, hf_bzr_packet_protocol_version, tvb, 0,
+ protocol_version_len+1, ENC_ASCII);
+ }
+
+ offset += dissect_prefixed_bencode(tvb, offset, pinfo, bzr_tree);
+ /*offset +=*/ dissect_body(tvb, offset, pinfo, bzr_tree);
+}
+
+static int
+dissect_bzr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+ gint offset = 0, pdu_len;
+ tvbuff_t *next_tvb;
+
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "BZR");
+
+ col_set_str(pinfo->cinfo, COL_INFO, "Bazaar Smart Protocol");
+
+ while (tvb_reported_length_remaining(tvb, offset) > 0) {
+ pdu_len = get_bzr_pdu_len(pinfo, tvb, offset);
+ if (pdu_len == -1) {
+ if (pinfo->can_desegment && bzr_desegment) {
+ pinfo->desegment_offset = offset;
+ pinfo->desegment_len = DESEGMENT_ONE_MORE_SEGMENT;
+ return tvb_captured_length(tvb);
+ } else {
+ pdu_len = tvb_reported_length_remaining(tvb, offset);
+ }
+ }
+ next_tvb = tvb_new_subset_length(tvb, offset, pdu_len);
+ dissect_bzr_pdu(next_tvb, pinfo, tree);
+ offset += pdu_len;
+ }
+
+ return tvb_captured_length(tvb);
+}
+
+void
+proto_register_bzr(void)
+{
+ static hf_register_info hf[] = {
+ { &hf_bzr_packet_kind,
+ { "Packet kind", "bzr.kind", FT_CHAR, BASE_HEX,
+ VALS(message_part_kind), 0x0, NULL, HFILL },
+ },
+ { &hf_bzr_packet_protocol_version,
+ { "Protocol version", "bzr.protocol_version", FT_STRING, BASE_NONE,
+ NULL, 0x0, NULL, HFILL },
+ },
+ { &hf_bzr_prefixed_bencode,
+ { "Bencode packet", "bzr.bencode", FT_NONE, BASE_NONE, NULL, 0x0,
+ "Serialized structure of integers, dictionaries, strings and "
+ "lists.", HFILL },
+ },
+ { &hf_bzr_prefixed_bencode_len,
+ { "Bencode packet length", "bzr.bencode.length", FT_UINT32,
+ BASE_HEX, NULL, 0x0, NULL, HFILL },
+ },
+ { &hf_bzr_bytes,
+ { "Prefixed bytes", "bzr.bytes", FT_NONE, BASE_NONE, NULL, 0x0,
+ "Bytes field with prefixed 32-bit length", HFILL },
+ },
+ { &hf_bzr_bytes_data,
+ { "Prefixed bytes data", "bzr.bytes.data", FT_BYTES, BASE_NONE,
+ NULL, 0x0, NULL, HFILL },
+ },
+ { &hf_bzr_bytes_length,
+ { "Prefixed bytes length", "bzr.bytes.length", FT_UINT32, BASE_HEX,
+ NULL, 0x0, NULL, HFILL },
+ },
+ { &hf_bzr_result,
+ { "Result", "bzr.result", FT_CHAR, BASE_HEX,
+ VALS(message_results), 0x0,
+ "Command result (success or failure with error message)", HFILL
+ },
+ },
+ };
+
+ static gint *ett[] = {
+ &ett_bzr,
+ &ett_prefixed_bencode,
+ &ett_prefixed_bytes,
+ };
+
+ module_t *bzr_module;
+ proto_bzr = proto_register_protocol("Bazaar Smart Protocol", "Bazaar", "bzr");
+ bzr_handle = register_dissector("bzr", dissect_bzr, proto_bzr);
+ proto_register_field_array(proto_bzr, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+
+ bzr_module = prefs_register_protocol(proto_bzr, NULL);
+
+ prefs_register_bool_preference(bzr_module, "desegment",
+ "Reassemble Bazaar messages spanning multiple TCP segments",
+ "Whether the Bazaar dissector should reassemble messages spanning multiple TCP segments."
+ " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\""
+ " in the TCP protocol settings.",
+ &bzr_desegment);
+}
+
+void
+proto_reg_handoff_bzr(void)
+{
+ bencode_handle = find_dissector_add_dependency("bencode", proto_bzr);
+
+ dissector_add_uint_with_preference("tcp.port", TCP_PORT_BZR, bzr_handle);
+}
+
+/*
+ * Editor modelines - https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */
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