packet-mqtt.c: Minor cleanup
- Create/use an extended value string; - Use ...add_text() instead of ..._add_string() for a packet details "header" line (Removes a filter named "mqtt" (not the 'protocol' filter)); - Fix what is (IMO) a slightly misleading display of "Connect Flags"; - Remove two lines of duplicate code; - Localize some variables; - Remove some unneeded initializers; - Set tab-stops, etc in editor mode-lines to 8; - 'offset++' ==> 'offset += 1'; - Do some minor whitespace changes. Change-Id: Ia891c6893643790dbb26510f060c4fb6dfe1fe3a Reviewed-on: https://code.wireshark.org/review/1304 Reviewed-by: Bill Meier <wmeier@newsguy.com>
This commit is contained in:
Bill Meier
parent
fe195c0c97
commit
3b6789ecbe
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@ -1,7 +1,7 @@
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/* packet-mqtt.c
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* Routines for MQTT Protocol dissection
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* http://mqtt.org
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* This dissector dissects, MQTT data transfers as per MQTT V3.1 Protocol Specification
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* This dissector dissects MQTT data transfers as per MQTT V3.1 Protocol Specification
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*
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* By Lakshmi Narayana Madala <madalanarayana@outlook.com>
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*
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@ -34,16 +34,16 @@
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#define MQTT_HDR_SIZE_BEFORE_LEN 1
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/* MQTT MEssage Types */
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#define MQTT_RESERVED 0
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#define MQTT_CONNECT 1
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#define MQTT_CONNACK 2
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#define MQTT_PUBLISH 3
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#define MQTT_PUBACK 4
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#define MQTT_PUBREC 5
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#define MQTT_PUBREL 6
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#define MQTT_PUBCOMP 7
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#define MQTT_SUBSCRIBE 8
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#define MQTT_SUBACK 9
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#define MQTT_RESERVED 0
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#define MQTT_CONNECT 1
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#define MQTT_CONNACK 2
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#define MQTT_PUBLISH 3
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#define MQTT_PUBACK 4
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#define MQTT_PUBREC 5
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#define MQTT_PUBREL 6
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#define MQTT_PUBCOMP 7
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#define MQTT_SUBSCRIBE 8
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#define MQTT_SUBACK 9
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#define MQTT_UNSUBSCRIBE 10
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#define MQTT_UNSUBACK 11
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#define MQTT_PINGREQ 12
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@ -81,6 +81,7 @@ static const value_string mqtt_msgtype_vals[] = {
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{ MQTT_RESERVED_15, "Reserved" },
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{ 0, NULL }
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};
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static value_string_ext mqtt_msgtype_vals_ext = VALUE_STRING_EXT_INIT(mqtt_msgtype_vals);
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#define MQTT_QOS_ATMOST_ONCE 0
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#define MQTT_QOS_ATLEAST_ONCE 1
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@ -114,13 +115,13 @@ static const value_string mqtt_conack_vals[] = {
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#define MQTT_MASK_CONACK 0x00FF /*Only byte2 is used */
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#define MQTT_CONMASK_FLAGS 0xFE /* Last bit is reserved */
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#define MQTT_CONMASK_USER 0x80
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#define MQTT_CONMASK_PASSWD 0x40
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#define MQTT_CONMASK_RETAIN 0x20
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#define MQTT_CONMASK_QOS 0x18
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#define MQTT_CONMASK_WILLFLAG 0x04
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#define MQTT_CONMASK_CLEANSESS 0x02
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#define MQTT_CONMASK_RESERVED 0x01
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static dissector_handle_t mqtt_handle;
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@ -128,7 +129,6 @@ static dissector_handle_t mqtt_handle;
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static int proto_mqtt = -1;
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/* Message */
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static int hf_mqtt_msg = -1;
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static int hf_mqtt_hdrflags = -1;
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static int hf_mqtt_msg_len = -1;
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static int hf_mqtt_msg_type = -1;
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@ -154,6 +154,7 @@ static int hf_mqtt_conflag_will_retain = -1;
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static int hf_mqtt_conflag_will_qos = -1;
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static int hf_mqtt_conflag_will_flag = -1;
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static int hf_mqtt_conflag_clean_sess = -1;
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static int hf_mqtt_conflag_reserved = -1;
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static int hf_mqtt_keep_alive = -1;
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/* Initialize the subtree pointers */
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@ -181,20 +182,8 @@ static guint get_mqtt_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
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/* Dissect the MQTT message */
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static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_item *ti = NULL;
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proto_item *ti_mqtt = NULL;
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proto_tree *mqtt_tree = NULL;
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proto_tree *mqtt_msg_tree = NULL;
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proto_tree *mqtt_flag_tree = NULL;
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guint8 mqtt_fixed_hdr = 0;
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guint8 mqtt_con_flags = 0;
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guint8 mqtt_msg_type = 0;
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guint64 msg_len = 0;
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gint mqtt_msg_len = 0;
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guint16 mqtt_str_len = 0;
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guint16 mqtt_len_offset = 0;
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guint8 mqtt_fixed_hdr;
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guint8 mqtt_msg_type;
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int offset = 0;
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@ -203,13 +192,24 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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mqtt_msg_type = mqtt_fixed_hdr >> 4;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MQTT");
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/* Clear out stuff in the info column */
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col_clear(pinfo->cinfo,COL_INFO);
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col_add_fstr(pinfo->cinfo, COL_INFO, " %s", val_to_str(mqtt_msg_type, mqtt_msgtype_vals, "Unknown (0x%02x)"));
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col_add_fstr(pinfo->cinfo, COL_INFO, " %s", val_to_str_ext(mqtt_msg_type, &mqtt_msgtype_vals_ext, "Unknown (0x%02x)"));
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if(tree)
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{
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/* Add MQTT Branch to the main tree */
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proto_item *ti;
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proto_item *ti_mqtt;
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proto_tree *mqtt_tree;
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proto_tree *mqtt_msg_tree;
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proto_tree *mqtt_flag_tree;
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guint8 mqtt_con_flags;
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guint64 msg_len = 0;
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gint mqtt_msg_len = 0;
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guint16 mqtt_str_len;
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guint16 mqtt_len_offset;
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/* Add MQTT Branch to the main tree */
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ti = proto_tree_add_item(tree, proto_mqtt, tvb, 0, -1, ENC_NA);
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mqtt_tree = proto_item_add_subtree(ti, ett_mqtt_hdr);
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@ -218,22 +218,19 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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/* Explicit downcast, Typically maximum length of message could be 4 bytes */
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mqtt_msg_len = (gint) msg_len;
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/* Start PDU Dissection, Extract the message ID */
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mqtt_fixed_hdr = tvb_get_guint8(tvb, offset);
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mqtt_msg_type = mqtt_fixed_hdr >> 4;
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/* Add each MQTT message as a subtree to main Tree */
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ti_mqtt = proto_tree_add_string(mqtt_tree, hf_mqtt_msg, tvb, offset, mqtt_msg_len, mqtt_msgtype_vals[mqtt_msg_type].strptr);
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ti_mqtt = proto_tree_add_text(mqtt_tree, tvb, offset, mqtt_msg_len,
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val_to_str_ext(mqtt_msg_type, &mqtt_msgtype_vals_ext, "Unknown (0x%02x)"));
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mqtt_msg_tree = proto_item_add_subtree(ti_mqtt, ett_mqtt_msg);
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ti_mqtt = proto_tree_add_uint_format_value(mqtt_msg_tree, hf_mqtt_hdrflags, tvb, offset, 1, mqtt_fixed_hdr, "0x%02x (%s)",
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mqtt_fixed_hdr, val_to_str(mqtt_msg_type, mqtt_msgtype_vals, "Unknown (0x%02x)") );
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mqtt_fixed_hdr, val_to_str_ext(mqtt_msg_type, &mqtt_msgtype_vals_ext, "Unknown (0x%02x)") );
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mqtt_flag_tree = proto_item_add_subtree(ti_mqtt, ett_mqtt_hdr_flags);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_msg_type, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_dup_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_msg_type, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_dup_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_qos_level, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_retain, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_retain, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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/* Add MQTT message length */
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proto_tree_add_uint64(mqtt_msg_tree, hf_mqtt_msg_len, tvb, offset, mqtt_len_offset, msg_len);
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@ -244,7 +241,7 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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case MQTT_CONNECT:
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/* TopicLen|Topic|MsgID|Message| */
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mqtt_str_len = tvb_get_ntohs(tvb, offset);
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offset +=2;
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offset += 2;
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mqtt_msg_len -= 2;
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_proto_name, tvb, offset, mqtt_str_len, ENC_UTF_8|ENC_NA);
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@ -252,28 +249,29 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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mqtt_msg_len -= mqtt_str_len;
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_proto_ver, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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mqtt_msg_len--;
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offset += 1;
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mqtt_msg_len -= 1;
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/* Create a new subtree for flags, and add all items under this tree */
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mqtt_con_flags = tvb_get_guint8(tvb, offset);
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ti_mqtt = proto_tree_add_item(mqtt_msg_tree, hf_mqtt_conflags, tvb, offset, 1, ENC_BIG_ENDIAN);
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mqtt_flag_tree = proto_item_add_subtree(ti_mqtt, ett_mqtt_con_flags);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_conflag_user, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_conflag_passwd, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_conflag_user, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_conflag_passwd, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_conflag_will_retain, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_conflag_will_qos, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_conflag_will_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_conflag_clean_sess, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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mqtt_msg_len--;
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_conflag_will_qos, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_conflag_will_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_conflag_clean_sess, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mqtt_flag_tree, hf_mqtt_conflag_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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mqtt_msg_len -= 1;
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_keep_alive, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset+=2;
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mqtt_msg_len-=2;
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offset += 2;
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mqtt_msg_len -=2;
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mqtt_str_len = tvb_get_ntohs(tvb, offset);
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offset +=2;
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offset += 2;
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mqtt_msg_len -= 2;
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_client_id, tvb, offset, mqtt_str_len, ENC_UTF_8|ENC_NA);
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@ -293,7 +291,7 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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if(mqtt_con_flags & MQTT_CONMASK_WILLFLAG)
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{
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mqtt_str_len = tvb_get_ntohs(tvb, offset);
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offset +=2;
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offset += 2;
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mqtt_msg_len -= 2;
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_will_msg, tvb, offset, mqtt_str_len, ENC_UTF_8|ENC_NA);
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@ -303,7 +301,7 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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if((mqtt_con_flags & MQTT_CONMASK_USER) && (tvb_reported_length_remaining(tvb, offset) > 0) )
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{
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mqtt_str_len = tvb_get_ntohs(tvb, offset);
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offset +=2;
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offset += 2;
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mqtt_msg_len -= 2;
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_username, tvb, offset, mqtt_str_len, ENC_UTF_8|ENC_NA);
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@ -313,7 +311,7 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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if((mqtt_con_flags & MQTT_CONMASK_PASSWD) && (tvb_reported_length_remaining(tvb, offset) > 0))
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{
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mqtt_str_len = tvb_get_ntohs(tvb, offset);
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offset +=2;
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offset += 2;
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mqtt_msg_len -= 2;
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_passwd, tvb, offset, mqtt_str_len, ENC_UTF_8|ENC_NA);
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@ -330,7 +328,7 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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case MQTT_PUBLISH:
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/* TopicLen|Topic|MsgID|Message| */
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mqtt_str_len = tvb_get_ntohs(tvb, offset);
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offset +=2;
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offset += 2;
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mqtt_msg_len -= 2;
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_topic, tvb, offset, mqtt_str_len, ENC_UTF_8|ENC_NA);
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@ -341,7 +339,7 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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if(mqtt_fixed_hdr & MQTT_MASK_QOS)
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{
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_msgid, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset +=2;
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offset += 2;
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mqtt_msg_len -=2;
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}
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_pubmsg, tvb, offset, mqtt_msg_len, ENC_UTF_8|ENC_NA);
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@ -356,7 +354,7 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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for( mqtt_msg_len -=2;mqtt_msg_len >0;)
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{
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mqtt_str_len = tvb_get_ntohs(tvb, offset);
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offset +=2;
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offset += 2;
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mqtt_msg_len -= 2;
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_topic, tvb, offset, mqtt_str_len, ENC_UTF_8|ENC_NA);
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@ -364,8 +362,8 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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mqtt_msg_len -= mqtt_str_len;
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_subqos, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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mqtt_msg_len--;
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offset += 1;
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mqtt_msg_len -= 1;
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}
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break;
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@ -378,7 +376,7 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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for( mqtt_msg_len -=2;mqtt_msg_len >0;)
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{
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mqtt_str_len = tvb_get_ntohs(tvb, offset);
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offset +=2;
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offset += 2;
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mqtt_msg_len -= 2;
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_topic, tvb, offset, mqtt_str_len, ENC_UTF_8|ENC_NA);
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@ -394,10 +392,10 @@ static int dissect_mqtt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, voi
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*/
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_msgid, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset+=2;
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for( mqtt_msg_len -=2; mqtt_msg_len >0 ;mqtt_msg_len--)
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for( mqtt_msg_len -=2; mqtt_msg_len > 0 ;mqtt_msg_len--)
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{
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proto_tree_add_item(mqtt_msg_tree, hf_mqtt_subqos, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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offset += 1;
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}
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break;
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@ -437,10 +435,6 @@ static int dissect_mqtt_data(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree
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void proto_register_mqtt(void)
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{
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static hf_register_info hf_mqtt[] = {
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{ &hf_mqtt_msg,
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{ "MQTT", "mqtt",
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FT_STRING, BASE_NONE, NULL, 0,
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NULL, HFILL }},
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{ &hf_mqtt_msg_len,
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{ "Msg Len", "mqtt.len",
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FT_UINT64, BASE_DEC, NULL, 0,
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@ -451,7 +445,7 @@ void proto_register_mqtt(void)
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NULL, HFILL }},
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{ &hf_mqtt_msg_type,
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{ "Message Type", "mqtt.msgtype",
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FT_UINT8, BASE_DEC, VALS(mqtt_msgtype_vals), MQTT_MASK_MSG_TYPE,
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FT_UINT8, BASE_DEC | BASE_EXT_STRING, &mqtt_msgtype_vals_ext, MQTT_MASK_MSG_TYPE,
|
||||
NULL, HFILL }},
|
||||
{ &hf_mqtt_dup_flag,
|
||||
{ "DUP Flag", "mqtt.dupflag",
|
||||
|
|
@ -518,7 +512,7 @@ void proto_register_mqtt(void)
|
|||
/* Connect Flags */
|
||||
{ &hf_mqtt_conflags,
|
||||
{ "Connect Flags", "mqtt.conflags",
|
||||
FT_UINT8, BASE_HEX, NULL, MQTT_CONMASK_FLAGS,
|
||||
FT_UINT8, BASE_HEX, NULL, 0xFF,
|
||||
NULL, HFILL }},
|
||||
{ &hf_mqtt_conflag_user,
|
||||
{ "User Name Flag", "mqtt.conflag.uname",
|
||||
|
|
@ -544,6 +538,10 @@ void proto_register_mqtt(void)
|
|||
{ "Clean Session Flag", "mqtt.conflag.cleansess",
|
||||
FT_BOOLEAN, 8, TFS(&tfs_set_notset), MQTT_CONMASK_CLEANSESS,
|
||||
NULL, HFILL }},
|
||||
{ &hf_mqtt_conflag_reserved,
|
||||
{ "(Reserved)", "mqtt.conflag.reserved",
|
||||
FT_BOOLEAN, 8, TFS(&tfs_set_notset), MQTT_CONMASK_RESERVED,
|
||||
NULL, HFILL }},
|
||||
{ &hf_mqtt_keep_alive,
|
||||
{ "Keep Alive", "mqtt.kalive",
|
||||
FT_UINT16, BASE_DEC, NULL, 0,
|
||||
|
|
@ -585,6 +583,6 @@ void proto_reg_handoff_mqtt(void)
|
|||
* indent-tabs-mode: nil
|
||||
* End:
|
||||
*
|
||||
* vi: set shiftwidth=2 tabstop=2 expandtab:
|
||||
* :indentSize=2:tabSize=2:noTabs=true:
|
||||
* vi: set shiftwidth=2 tabstop=8 expandtab:
|
||||
* :indentSize=2:tabSize=8:noTabs=true:
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in New Issue