plugins: Add source tree subfolder for plugin library

This allows some simplification and makes things more consistent,
particularly for loading plugins from the build dir.

Also fixes the issue reported here:

https://www.wireshark.org/lists/wireshark-dev/201801/msg00061.html

Change-Id: I0d8a000ee679172bccad546a3b0c47a79486f44d
Reviewed-on: https://code.wireshark.org/review/25329
Petri-Dish: João Valverde <j@v6e.pt>
Reviewed-by: João Valverde <j@v6e.pt>

1 files changed, 267 insertions, 0 deletions

diff --git a/plugins/epan/wimax/wimax_pdu_decoder.c b/plugins/epan/wimax/wimax_pdu_decoder.c
new file mode 100644
index 0000000000..d17b46288f
--- /dev/null
+++ b/plugins/epan/wimax/wimax_pdu_decoder.c
@@ -0,0 +1,267 @@
+/* wimax_pdu_decoder.c
+ * WiMax PDU Burst decoder
+ *
+ * Copyright (c) 2007 by Intel Corporation.
+ *
+ * Author: Lu Pan <lu.pan@intel.com>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1999 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* Include files */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include "crc.h"
+#include "wimax-int.h"
+#include "wimax_utils.h"
+
+extern gint proto_wimax;
+
+void proto_reg_handoff_wimax_pdu(void);
+
+static dissector_handle_t mac_generic_decoder_handle = NULL;
+static dissector_handle_t mac_header_type1_handle = NULL;
+static dissector_handle_t mac_header_type2_handle = NULL;
+static dissector_handle_t wimax_harq_map_handle = NULL;
+
+#define WIMAX_PDU_PADDING_MASK           0xFF
+#define WIMAX_INVALID_PDU_MASK           0xF0
+#define WIMAX_MAP_TYPE_MASK              0xE0  /* 0b111 */
+#define WIMAX_HARQ_MAP_MSG_IND           0xE0  /* 0b111 */
+#define WIMAX_COMPRESSED_DL_MAP_IND      0xC0  /* 0b110 */
+#define REDUCED_PRIVATE_MAP_MASK         0x0C  /* 0b11 */
+
+#define WIMAX_MAC_HEADER_SIZE            6
+#define WIMAX_MAC_HEADER_INFO_FIELDS     5
+#define WIMAX_MAC_HEADER_HT_FIELD        0x80
+#define WIMAX_MAC_HEADER_EC_FIELD        0x40
+#define WIMAX_MAC_HEADER_LENGTH_MSB_MASK 0x07
+
+#define WIMAX_HARQ_MAP_MSG_LENGTH_MASK1  0x07FC
+/* Global Variables. */
+gboolean first_gmh;
+
+static gint proto_wimax_pdu_decoder = -1;
+static gint ett_wimax_pdu_decoder = -1;
+
+static int hf_wimax_value_bytes = -1;
+
+static int dissect_wimax_pdu_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+	guint offset;
+	guint mac_ht, mac_ec;
+	guint first_byte, length;
+	guint mac_hcs, mac_hcs_calculated;
+	proto_item *pdu_item = NULL;
+	proto_tree *pdu_tree = NULL;
+
+#ifndef STATIC_DATA
+	/* generate the table of CRC32  remainders for all possible bytes */
+	wimax_mac_gen_crc32_table();
+	/* generate the table of CRC8 remainders for all possible bytes */
+	wimax_mac_gen_crc8_table();
+#endif
+
+	/* parsing the PDU burst */
+	for(offset = 0; offset < tvb_reported_length(tvb); )
+	{
+		if (offset == 0)
+		{
+			first_gmh = TRUE;
+		}
+		else
+		{
+			first_gmh = FALSE;
+		}
+		/* get the length of the remainder */
+		length = tvb_reported_length_remaining(tvb, offset);
+		/* get the first byte at offset */
+		first_byte = tvb_get_guint8(tvb, offset);
+		/* check for padding */
+		if(first_byte == WIMAX_PDU_PADDING_MASK)
+		{	/* Padding */
+			/* display message */
+			pdu_item = proto_tree_add_protocol_format(tree, proto_wimax_pdu_decoder, tvb, offset, length, "Padding (%u bytes)", length);
+			/* add subtree */
+			pdu_tree = proto_item_add_subtree(pdu_item, ett_wimax_pdu_decoder);
+			/* display the padding in Hex */
+			proto_tree_add_item(pdu_tree, hf_wimax_value_bytes, tvb, offset, length, ENC_NA);
+			break;
+		}
+		else if((first_byte & WIMAX_MAP_TYPE_MASK) == WIMAX_HARQ_MAP_MSG_IND)
+		{	/* HARQ MAP message (no mac header) */
+			/* get the HARQ MAp Message Length */
+			length = ((tvb_get_ntohs(tvb, offset) & WIMAX_HARQ_MAP_MSG_LENGTH_MASK1) >> 2);
+			if (length == 0)
+			{
+				length = 3;	/* At least 3 bytes.  This prevents endless loop */
+			}
+			call_dissector(wimax_harq_map_handle, tvb_new_subset_length(tvb,offset,length), pinfo, tree);
+			offset += length;
+			continue;
+		}
+		else if((first_byte & WIMAX_MAP_TYPE_MASK) == WIMAX_COMPRESSED_DL_MAP_IND)
+		{
+			if(is_down_link(pinfo))
+			{	/* decode compressed dl-map without mac header */
+				if ((first_byte & REDUCED_PRIVATE_MAP_MASK) == REDUCED_PRIVATE_MAP_MASK)
+				{
+					length = wimax_decode_dlmap_reduced_aas(tvb, pinfo, tree);
+				}
+				else
+				{
+					length = wimax_decode_dlmapc(tvb, pinfo, tree);
+				}
+				offset += length;
+				continue;
+			}
+		}
+		else if((first_byte & WIMAX_INVALID_PDU_MASK) == WIMAX_INVALID_PDU_MASK)
+		{	/* Invalid PDU */
+			/* update the info column */
+			col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Invalid PDU");
+			/* display message */
+			pdu_item = proto_tree_add_protocol_format(tree, proto_wimax_pdu_decoder, tvb, offset, length, "Invalid PDU  (%u bytes)", length);
+			/* add subtree */
+			pdu_tree = proto_item_add_subtree(pdu_item, ett_wimax_pdu_decoder);
+				/* display the invalid MAC Header in Hex */
+			proto_tree_add_item(pdu_tree, hf_wimax_value_bytes, tvb, offset, length, ENC_NA);
+			break;
+		}
+		/* calculate the MAC header HCS */
+		mac_hcs_calculated = wimax_mac_calc_crc8(tvb_get_ptr(tvb, offset, WIMAX_MAC_HEADER_INFO_FIELDS), WIMAX_MAC_HEADER_INFO_FIELDS);
+		/* get the Header Check Sequence (HCS) in the header */
+		mac_hcs = tvb_get_guint8(tvb, offset + WIMAX_MAC_HEADER_SIZE - 1);
+		/* verify the HCS */
+		if(mac_hcs != mac_hcs_calculated)
+		{
+			/* update the info column */
+			col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "MAC Header CRC error");
+			/* display message */
+			pdu_item = proto_tree_add_protocol_format(tree, proto_wimax_pdu_decoder, tvb, offset, WIMAX_MAC_HEADER_SIZE, "MAC Header CRC error %X (in header) and %X (calculated)", mac_hcs, mac_hcs_calculated);
+			/* add subtree */
+			pdu_tree = proto_item_add_subtree(pdu_item, ett_wimax_pdu_decoder);
+			/* display the bad MAC Header in Hex */
+			proto_tree_add_item(pdu_tree, hf_wimax_value_bytes, tvb, offset, length, ENC_NA);
+			break;
+		}
+		/* get the Header Type (HT) */
+		mac_ht = ((first_byte & WIMAX_MAC_HEADER_HT_FIELD)?1:0);
+		/* get the Encryption Control (EC) */
+		mac_ec = ((first_byte & WIMAX_MAC_HEADER_EC_FIELD)?1:0);
+		/* update the MAC length for Generic MAC frame */
+		if(!mac_ht)
+		{	/* Generic MAC Header with payload */
+			/* get the MAC length */
+			length = (tvb_get_guint8(tvb, offset+1) & WIMAX_MAC_HEADER_LENGTH_MSB_MASK);
+			length = ((length<<8) | tvb_get_guint8(tvb, offset+2));
+		}
+		else	/* MAC signaling Headers or Bandwidth Request Headers */
+		{	/* set the mac length */
+			length = WIMAX_MAC_HEADER_SIZE;
+		}
+		/* display PDU frame info */
+		/*
+		pdu_item = proto_tree_add_protocol_format(tree, proto_wimax_pdu_decoder, tvb, offset, length, "PDU Frame (%u bytes)", length);
+		*/
+		pdu_item = proto_tree_add_protocol_format(tree, proto_wimax_pdu_decoder, tvb, offset, length, "PDU (%u bytes)", length);
+		/* add PDU subtree */
+		pdu_tree = proto_item_add_subtree(pdu_item, ett_wimax_pdu_decoder);
+		if (length == 0) {
+			offset += 6;	/* Add header size. */
+			/* Must skip the code below or tvb_new_subset_length()
+			 * keeps allocating memory until it runs out. */
+			continue;
+		}
+		/* process the valid MAC header */
+		if(mac_ht)
+		{	/* MAC signaling Headers or Bandwidth Request Headers */
+			/* check the header type */
+			if(mac_ec)
+			{	/* MAC Signaling Header Type II Header */
+				proto_item_append_text(pdu_item, " - Mac Type II Header: ");
+				call_dissector(mac_header_type2_handle, tvb_new_subset_length(tvb,offset,length), pinfo, pdu_tree);
+			}
+			else
+			{	/* MAC Signaling Header Type I Header */
+				proto_item_append_text(pdu_item, " - Mac Type I Header: ");
+				call_dissector(mac_header_type1_handle, tvb_new_subset_length(tvb,offset,length), pinfo, pdu_tree);
+			}
+		}
+		else	/* Generic MAC Header with payload */
+		{
+			call_dissector(mac_generic_decoder_handle, tvb_new_subset_length(tvb,offset,length), pinfo, pdu_tree);
+		}
+		offset += length;
+	}
+	return tvb_captured_length(tvb);
+}
+
+/* Register Wimax PDU Burst Protocol */
+void wimax_proto_register_wimax_pdu(void)
+{
+	/* PDU display */
+	static hf_register_info hf[] =
+	{
+		{
+			&hf_wimax_value_bytes,
+			{
+				"Values", "wmx.pdu.value",
+				FT_BYTES, BASE_NONE, NULL, 0x0,
+				NULL, HFILL
+			}
+		},
+	};
+
+	/* Setup protocol subtree array */
+	static gint *ett[] =
+		{
+			&ett_wimax_pdu_decoder,
+		};
+
+	proto_wimax_pdu_decoder = proto_wimax;
+
+	register_dissector("wimax_pdu_burst_handler", dissect_wimax_pdu_decoder, -1);
+	proto_register_field_array(proto_wimax_pdu_decoder, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+}
+
+void
+wimax_proto_reg_handoff_wimax_pdu(void)
+{
+	mac_generic_decoder_handle = find_dissector("mac_header_generic_handler");
+	mac_header_type1_handle = find_dissector("mac_header_type_1_handler");
+	mac_header_type2_handle = find_dissector("mac_header_type_2_handler");
+	wimax_harq_map_handle = find_dissector("wimax_harq_map_handler");
+}
+
+/*
+ * Editor modelines  -  http://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:
+ */