Adding upstream version 4.2.2.upstream/4.2.2

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

1 files changed, 230 insertions, 0 deletions

diff --git a/epan/dissectors/packet-rudp.c b/epan/dissectors/packet-rudp.c
new file mode 100644
index 00000000..73bc2eff
--- /dev/null
+++ b/epan/dissectors/packet-rudp.c
@@ -0,0 +1,230 @@
+/* packet-rudp.c
+ * Routines for Reliable UDP Protocol.
+ * Copyright 2004, Duncan Sargeant <dunc-ethereal@rcpt.to>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * Copied from packet-data.c, README.developer, and various other files.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+
+
+ * Reliable UDP is a lightweight protocol for providing TCP-like flow
+ * control over UDP.  Cisco published an PFC a long time ago, and
+ * their actual implementation is slightly different, having no
+ * checksum field.
+ *
+ * I've cheated here - RUDP could be used for anything, but I've only
+ * seen it used to switched telephony calls, so we just call the Cisco SM
+ * dissector from here.
+ *
+ * Here are some links:
+ *
+ * http://www.watersprings.org/pub/id/draft-ietf-sigtran-reliable-udp-00.txt
+ * http://www.javvin.com/protocolRUDP.html
+ * http://www.cisco.com/univercd/cc/td/doc/product/access/sc/rel7/omts/omts_apb.htm#30052
+
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+
+
+void proto_register_rudp(void);
+
+void proto_reg_handoff_rudp(void);
+
+static dissector_handle_t rudp_handle;
+
+static int proto_rudp = -1;
+
+static int hf_rudp_flags = -1;
+static int hf_rudp_flags_syn = -1;
+static int hf_rudp_flags_ack = -1;
+static int hf_rudp_flags_eak = -1;
+static int hf_rudp_flags_rst = -1;
+static int hf_rudp_flags_nul = -1;
+static int hf_rudp_flags_chk = -1;
+static int hf_rudp_flags_tcs = -1;
+static int hf_rudp_flags_0 = -1;
+static int hf_rudp_hlen = -1;
+static int hf_rudp_seq = -1;
+static int hf_rudp_ack = -1;
+static int hf_rudp_cksum = -1;
+
+static gint ett_rudp = -1;
+static gint ett_rudp_flags = -1;
+
+static dissector_handle_t sm_handle = NULL;
+
+static int
+dissect_rudp(tvbuff_t *tvb, packet_info *pinfo _U_ , proto_tree *tree, void* data _U_)
+{
+	tvbuff_t * next_tvb;
+	proto_tree *rudp_tree;
+	proto_item *ti;
+	guint8 hlen;
+	static int * const flags[] = {
+		&hf_rudp_flags_syn,
+		&hf_rudp_flags_ack,
+		&hf_rudp_flags_eak,
+		&hf_rudp_flags_rst,
+		&hf_rudp_flags_nul,
+		&hf_rudp_flags_chk,
+		&hf_rudp_flags_tcs,
+		&hf_rudp_flags_0,
+		NULL
+	};
+
+	hlen = tvb_get_guint8(tvb, 1);
+
+	col_set_str(pinfo->cinfo, COL_PROTOCOL, "RUDP");
+	col_clear(pinfo->cinfo, COL_INFO);
+
+	ti = proto_tree_add_item(tree, proto_rudp, tvb, 0, hlen, ENC_NA);
+	rudp_tree = proto_item_add_subtree(ti, ett_rudp);
+
+	proto_tree_add_bitmask(rudp_tree, tvb, 0, hf_rudp_flags, ett_rudp_flags, flags, ENC_BIG_ENDIAN);
+
+	proto_tree_add_item(rudp_tree, hf_rudp_hlen, tvb, 1, 1, ENC_BIG_ENDIAN);
+	proto_tree_add_item(rudp_tree, hf_rudp_seq, tvb, 2, 1, ENC_BIG_ENDIAN);
+	proto_tree_add_item(rudp_tree, hf_rudp_ack, tvb, 3, 1, ENC_BIG_ENDIAN);
+
+	/* If the header is more than 4 bytes the next 2 bytes are the checksum */
+	if (hlen > 4) {
+		proto_tree_add_checksum(rudp_tree, tvb, 4, hf_rudp_cksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
+	}
+
+	/* If we have even more bytes their meaning is unknown - we have seen this
+		* in live captures */
+	if (hlen > 6) {
+		next_tvb = tvb_new_subset_length(tvb, 6, hlen-6);
+		call_data_dissector(next_tvb, pinfo, rudp_tree);
+	}
+
+	next_tvb = tvb_new_subset_remaining(tvb, hlen);
+	if (tvb_captured_length(next_tvb) && sm_handle)
+		call_dissector(sm_handle, next_tvb, pinfo, tree);
+
+	return tvb_captured_length(tvb);
+}
+
+void
+proto_register_rudp(void)
+{
+
+	static hf_register_info hf[] = {
+		{ &hf_rudp_flags,
+			{ "RUDP Header flags",           "rudp.flags",
+			FT_UINT8, BASE_DEC, NULL, 0x0,
+			NULL, HFILL }
+		},
+		{ &hf_rudp_flags_syn,
+			{ "Syn",           "rudp.flags.syn",
+			FT_BOOLEAN, 8, NULL, 0x80,
+			NULL, HFILL }
+		},
+		{ &hf_rudp_flags_ack,
+			{ "Ack",           "rudp.flags.ack",
+			FT_BOOLEAN, 8, NULL, 0x40,
+			NULL, HFILL }
+		},
+		{ &hf_rudp_flags_eak,
+			{ "Eak",           "rudp.flags.eak",
+			FT_BOOLEAN, 8, NULL, 0x20,
+			"Extended Ack", HFILL }
+		},
+		{ &hf_rudp_flags_rst,
+			{ "RST",           "rudp.flags.rst",
+			FT_BOOLEAN, 8, NULL, 0x10,
+			"Reset flag", HFILL }
+		},
+		{ &hf_rudp_flags_nul,
+			{ "NULL",           "rudp.flags.nul",
+			FT_BOOLEAN, 8, NULL, 0x08,
+			"Null flag", HFILL }
+		},
+		{ &hf_rudp_flags_chk,
+			{ "CHK",           "rudp.flags.chk",
+			FT_BOOLEAN, 8, NULL, 0x04,
+			"Checksum is on header or body", HFILL }
+		},
+		{ &hf_rudp_flags_tcs,
+			{ "TCS",           "rudp.flags.tcs",
+			FT_BOOLEAN, 8, NULL, 0x02,
+			"Transfer Connection System", HFILL }
+		},
+		{ &hf_rudp_flags_0,
+			{ "0",           "rudp.flags.0",
+			FT_BOOLEAN, 8, NULL, 0x01,
+			NULL, HFILL }
+		},
+		{ &hf_rudp_hlen,
+			{ "Header Length",           "rudp.hlen",
+			FT_UINT8, BASE_DEC, NULL, 0x0,
+			NULL, HFILL }
+		},
+		{ &hf_rudp_seq,
+			{ "Seq",           "rudp.seq",
+			FT_UINT8, BASE_DEC, NULL, 0x0,
+			"Sequence Number", HFILL }
+		},
+		{ &hf_rudp_ack,
+			{ "Ack",           "rudp.ack",
+			FT_UINT8, BASE_DEC, NULL, 0x0,
+			"Acknowledgement Number", HFILL }
+		},
+		{ &hf_rudp_cksum,
+			{ "Checksum",           "rudp.cksum",
+			FT_UINT16, BASE_HEX, NULL, 0x0,
+			NULL, HFILL }
+		},
+	};
+
+
+/* Setup protocol subtree array */
+	static gint *ett[] = {
+		&ett_rudp,
+		&ett_rudp_flags,
+	};
+
+
+	proto_rudp = proto_register_protocol ("Reliable UDP", "RUDP", "rudp");
+
+	proto_register_field_array(proto_rudp, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+
+	rudp_handle = register_dissector("rudp", dissect_rudp, proto_rudp);
+}
+
+void
+proto_reg_handoff_rudp(void) {
+
+/* Disable rudp by default. The previously hardcoded value of
+ * 7000 (used by Cisco) collides with afs and as the draft states:
+ * "RUDP doesn't place any restrictions on which UDP port numbers are used.
+ *  Valid port numbers are ports not defined in RFC 1700."
+ */
+/* FIXME: The proper solution would be to convert this dissector into
+ *        heuristic dissector, but it isn't complete anyway.
+ */
+
+	dissector_add_for_decode_as_with_preference("udp.port", rudp_handle);
+	sm_handle = find_dissector_add_dependency("sm", proto_rudp);
+}
+
+/*
+ * 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:
+ */