Ethereal-dev: [Ethereal-dev] New dissector...
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From: "Kevin A. Noll" <kevin.noll@xxxxxxxxxxxxxxxx>
Date: Mon, 15 Sep 2003 19:59:27 -0400
Please excuse me if this hasa been discussed, but I could not
find anything that answered my question.
I have written a dissector for RTP events (RFC 2833). The dissector
works asa expected. However, since the payload type is specified to
be a range, I can't simply update the payload type tables in rtp-pt.h
and call the new dissector using that.
Instead, I would like to use a user preference.
Using other dissectors as examples, I am able to register the preference
and I can change the value in the preferences dialog. However,
when I change the value that I want to use, the decode does not change
appropriately.
So, how do I get the decode to use the preference that I am setting?
The dissector source is included below.
BTW - I am not a very experienced programmer/developer, so suggestions on
how to better implement this are welcome.
Thanks.
--kan--
--
Kevin A. Noll, KD4WOZ
CCIE, CCDP
Perfect Order, Inc.
Kevin.Noll@xxxxxxxxxxxxxxxx
717-796-1936
/* packet-rtp-events.c
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include "prefs.h"
#include <stdio.h>
#include <string.h>
#include "packet-rtp-events.h"
unsigned int rtp_event_payload_type_value = 101;
/* RTP Event Fields */
static int proto_rtp_events = -1;
static int hf_rtp_events_event = -1; /* one byte */
static int hf_rtp_events_end = -1; /* one bit */
static int hf_rtp_events_reserved = -1; /* one bit */
static int hf_rtp_events_volume = -1; /* six bits */
static int hf_rtp_events_duration = -1; /* sixteen bits */
/* RTP Events fields defining a subtree */
static gint ett_rtp_events = -1;
static void
dissect_rtp_events( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
{
proto_item *ti = NULL;
proto_tree *rtp_events_tree = NULL;
unsigned int offset = 0;
guint8 octet;
guint8 rtp_evt;
gboolean rtp_end;
gboolean rtp_reserved;
guint8 rtp_volume;
guint16 rtp_duration;
if ( check_col( pinfo->cinfo, COL_PROTOCOL ) )
{
col_set_str( pinfo->cinfo, COL_PROTOCOL, "RTP EVENT" );
}
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
/* Get event fields */
rtp_evt = tvb_get_guint8(tvb, offset );
octet = tvb_get_guint8(tvb, offset +1 );
rtp_volume = ((octet << 2) >> 2);
rtp_end = (octet >> 7);
rtp_reserved = ((octet << 1) >> 7 );
rtp_duration = tvb_get_ntohs(tvb, offset +2);
if ( check_col( pinfo->cinfo, COL_INFO) )
{
col_add_fstr( pinfo->cinfo, COL_INFO,
"Payload type=RTP Event, %s",
val_to_str( rtp_evt, rtp_event_type_values, "Unknown (%u)" ));
}
if ( tree )
{
ti = proto_tree_add_item( tree, proto_rtp_events, tvb, offset, -1,
FALSE );
rtp_events_tree = proto_item_add_subtree( ti, ett_rtp_events );
proto_tree_add_uint ( rtp_events_tree, hf_rtp_events_event, tvb,
offset, 1, rtp_evt);
proto_tree_add_boolean (rtp_events_tree, hf_rtp_events_end, tvb,
offset, 1, rtp_end);
proto_tree_add_boolean (rtp_events_tree, hf_rtp_events_reserved, tvb,
offset, 1, rtp_reserved);
proto_tree_add_uint ( rtp_events_tree, hf_rtp_events_volume, tvb,
offset, 1, rtp_volume);
proto_tree_add_uint ( rtp_events_tree, hf_rtp_events_duration, tvb,
offset, 2, rtp_duration);
}
}
void
proto_register_rtp_events(void)
{
module_t *rtp_events_module;
static hf_register_info hf[] =
{
{
&hf_rtp_events_event,
{
"Event ID",
"rtp.payload_rtp_events_event",
FT_UINT8,
BASE_DEC,
VALS(rtp_event_type_values),
0x0,
"", HFILL
}
},
{
&hf_rtp_events_end,
{
"End of Event",
"rtp.payload_rtp_events_end",
FT_BOOLEAN,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_events_reserved,
{
"Reserved",
"rtp.payload_rtp_events_reserved",
FT_BOOLEAN,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_events_volume,
{
"Volume",
"rtp.payload_rtp_events_volume",
FT_UINT8,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_events_duration,
{
"Event Duration",
"rtp.payload_rtp_events_duration",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
};
static gint *ett[] =
{
&ett_rtp_events,
};
proto_rtp_events = proto_register_protocol("RFC 2833 RTP Event","RTP
Event","rtpevent");
proto_register_field_array(proto_rtp_events, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Register preferences */
rtp_events_module = prefs_register_protocol (proto_rtp_events, NULL);
prefs_register_uint_preference (rtp_events_module,
"event_payload_type_value", "Payload
Type for RFC2833 RTP Events",
"This is the value of the Payload Type
field"
"that specifies RTP Events", 10,
&rtp_event_payload_type_value);
}
void
proto_reg_handoff_rtp_events(void)
{
dissector_handle_t rtp_events_handle;
rtp_events_handle = create_dissector_handle(dissect_rtp_events,
proto_rtp_events);
dissector_add("rtp.pt", rtp_event_payload_type_value, rtp_events_handle);
}
/* packet-rtp-events.h
*/
#define RTP_DTMF_0 0
#define RTP_DTMF_1 1
#define RTP_DTMF_2 2
#define RTP_DTMF_3 3
#define RTP_DTMF_4 4
#define RTP_DTMF_5 5
#define RTP_DTMF_6 6
#define RTP_DTMF_7 7
#define RTP_DTMF_8 8
#define RTP_DTMF_9 9
#define RTP_DTMF_STAR 10
#define RTP_DTMF_POUND 11
#define RTP_DTMF_A 12
#define RTP_DTMF_B 13
#define RTP_DTMF_C 14
#define RTP_DTMF_D 15
#define RTP_DTMF_FLASH 16
#define RTP_ANS 32
#define RTP_ANSREV 33
#define RTP_ANSAM 34
#define RTP_ANSAMREV 35
#define RTP_CNG 36
#define RTP_V21C1B0 37
#define RTP_V21C1B1 38
#define RTP_V21C2B0 39
#define RTP_V21C2B1 40
#define RTP_CRDI 41
#define RTP_CRDR 42
#define RTP_CRE 43
#define RTP_ESI 44
#define RTP_ESR 45
#define RTP_MRDI 46
#define RTP_MRDR 47
#define RTP_MRE 48
#define RTP_CT 49
#define RTP_OFFHOOK 64
#define RTP_ONHOOK 65
#define RTP_DIALTONE 66
#define RTP_INTDT 67
#define RTP_SPCDT 68
#define RTP_2NDDT 69
#define RTP_RGTONE 70
#define RTP_SPRGTONE 71
#define RTP_BUSYTONE 72
#define RTP_CNGTONE 73
#define RTP_SPINFOTN 74
#define RTP_CMFTTONE 75
#define RTP_HOLDTONE 76
#define RTP_RECTONE 77
#define RTP_CLRWTTONE 78
#define RTP_CWTONE 79
#define RTP_PAYTONE 80
#define RTP_POSINDTONE 81
#define RTP_NEGINDTONE 82
#define RTP_WARNTONE 83
#define RTP_INTRTONE 84
#define RTP_CALLCDTONE 85
#define RTP_PAYPHONE 86
#define RTP_CAS 87
#define RTP_OFFHKWARN 88
#define RTP_RING 89
#define RTP_ACCPTTONE 96
#define RTP_CONFIRMTN 97
#define RTP_DLTNRECALL 98
#define RTP_END3WAYTN 99
#define RTP_FACTONE 100
#define RTP_LNLOCKTN 101
#define RTP_NUMUNOBT 102
#define RTP_OFFERGTONE 103
#define RTP_PERMSIGTN 104
#define RTP_PREEMPTTN 105
#define RTP_QUETONE 106
#define RTP_REFUSALTN 107
#define RTP_ROUTETONE 108
#define RTP_VALIDTONE 109
#define RTP_WAITGTONE 110
#define RTP_WARNEOPTN 111
#define RTP_WARNPIPTN 112
#define RTP_MF0 128
#define RTP_MF1 129
#define RTP_MF2 130
#define RTP_MF3 131
#define RTP_MF4 132
#define RTP_MF5 133
#define RTP_MF6 134
#define RTP_MF7 135
#define RTP_MF8 136
#define RTP_MF9 137
#define RTP_K0 138
#define RTP_K1 139
#define RTP_K2 140
#define RTP_S0 141
#define RTP_S1 142
#define RTP_S3 143
#define RTP_WINK 160
#define RTP_WINKOFF 161
#define RTP_INCSEIZ 162
#define RTP_SEIZURE 163
#define RTP_UNSEIZE 164
#define RTP_COT 165
#define RTP_DEFCOT 166
#define RTP_COTTONE 167
#define RTP_COTSEND 168
#define RTP_COTVERFD 170
#define RTP_LOOPBACK 171
#define RTP_MWATTTONE 172
#define RTP_NEWMWATTTN 173
static const value_string rtp_event_type_values[] =
{
{ RTP_DTMF_0, "DTMF Zero 0" },
{ RTP_DTMF_1, "DTMF One 1" },
{ RTP_DTMF_2, "DTMF Two 2" },
{ RTP_DTMF_3, "DTMF Three 3" },
{ RTP_DTMF_4, "DTMF Four 4" },
{ RTP_DTMF_5, "DTMF Five 5" },
{ RTP_DTMF_6, "DTMF Six 6" },
{ RTP_DTMF_7, "DTMF Seven 7" },
{ RTP_DTMF_8, "DTMF Eight 8" },
{ RTP_DTMF_9, "DTMF Nine 9" },
{ RTP_DTMF_STAR, "DTMF Star *" },
{ RTP_DTMF_POUND, "DTMF Pound #" },
{ RTP_DTMF_A, "DTMF A" },
{ RTP_DTMF_B, "DTMF B" },
{ RTP_DTMF_C, "DTMF C" },
{ RTP_DTMF_D, "DTMF D" },
{ RTP_DTMF_FLASH, "Flash" },
{ RTP_ANS, "Fax ANS"},
{ RTP_ANSREV, "Fax /ANS"},
{ RTP_ANSAM, "Fax ANSam"},
{ RTP_ANSAMREV, "Fax /ANSam"},
{ RTP_CNG, "Fax CNG"},
{ RTP_V21C1B0, "V.21 channel 1, 0 bit"},
{ RTP_V21C1B1, "V.21 channel 1, 1 bit"},
{ RTP_V21C2B0, "V.21 channel 2, 0 bit"},
{ RTP_V21C2B1, "V.21 channel 2, 1 bit"},
{ RTP_CRDI, "Fax CRdi"},
{ RTP_CRDR, "Fax CRdr"},
{ RTP_CRE, "Fax CRe"},
{ RTP_ESI, "Fax ESi"},
{ RTP_ESR, "Fax ESr"},
{ RTP_MRDI, "Fax MRdi"},
{ RTP_MRDR, "Fax MRdr"},
{ RTP_MRE, "Fax MRe"},
{ RTP_CT, "Fax CT"},
{ RTP_OFFHOOK, "Off Hook"},
{ RTP_ONHOOK, "On Hook"},
{ RTP_DIALTONE, "Dial tone"},
{ RTP_INTDT, "PABX internal dial tone"},
{ RTP_SPCDT, "Special dial tone"},
{ RTP_2NDDT, "Second dial tone"},
{ RTP_RGTONE, "Ringing tone"},
{ RTP_SPRGTONE, "Special ringing tone"},
{ RTP_BUSYTONE, "Busy tone"},
{ RTP_CNGTONE, "Congestion tone"},
{ RTP_SPINFOTN, "Special information tone"},
{ RTP_CMFTTONE, "Comfort tone"},
{ RTP_HOLDTONE, "Hold tone"},
{ RTP_RECTONE, "Record tone"},
{ RTP_CLRWTTONE, "Caller waiting tone"},
{ RTP_CWTONE, "Call waiting tone"},
{ RTP_PAYTONE, "Pay tone"},
{ RTP_POSINDTONE, "Positive indication tone"},
{ RTP_NEGINDTONE, "Negative indication tone"},
{ RTP_WARNTONE, "Warning tone"},
{ RTP_INTRTONE, "Intrusion tone"},
{ RTP_CALLCDTONE, "Calling card service tone"},
{ RTP_PAYPHONE, "Payphone recognition tone"},
{ RTP_CAS, "CPE alerting signal (CAS)"},
{ RTP_OFFHKWARN, "Off-hook warning tone"},
{ RTP_RING, "Ring"},
{ RTP_ACCPTTONE, "Acceptance tone"},
{ RTP_CONFIRMTN, "Confirmation tone"},
{ RTP_DLTNRECALL, "Dial tone, recall"},
{ RTP_END3WAYTN, "End of three party service tone"},
{ RTP_FACTONE, "Facilities tone"},
{ RTP_LNLOCKTN, "Line lockout tone"},
{ RTP_NUMUNOBT, "Number unobtainable tone"},
{ RTP_OFFERGTONE, "Offering tone"},
{ RTP_PERMSIGTN, "Permanent signal tone"},
{ RTP_PREEMPTTN, "Preemption tone"},
{ RTP_QUETONE, "Queue tone"},
{ RTP_REFUSALTN, "Refusal tone"},
{ RTP_ROUTETONE, "Route tone"},
{ RTP_VALIDTONE, "Valid tone"},
{ RTP_WAITGTONE, "Waiting tone"},
{ RTP_WARNEOPTN, "Warning tone (end of period)"},
{ RTP_WARNPIPTN, "Warning Tone (PIP tone)"},
{ RTP_MF0, "MF 0"},
{ RTP_MF1, "MF 1"},
{ RTP_MF2, "MF 2"},
{ RTP_MF3, "MF 3"},
{ RTP_MF4, "MF 4"},
{ RTP_MF5, "MF 5"},
{ RTP_MF6, "MF 6"},
{ RTP_MF7, "MF 7"},
{ RTP_MF8, "MF 8"},
{ RTP_MF9, "MF 9"},
{ RTP_K0, "MF K0 or KP (start-of-pulsing)"},
{ RTP_K1, "MF K1"},
{ RTP_K2, "MF K2"},
{ RTP_S0, "MF S0 to ST (end-of-pulsing)"},
{ RTP_S1, "MF S1"},
{ RTP_S3, "MF S3"},
{ RTP_WINK, "Wink"},
{ RTP_WINKOFF, "Wink off"},
{ RTP_INCSEIZ, "Incoming seizure"},
{ RTP_SEIZURE, "Seizure"},
{ RTP_UNSEIZE, "Unseize circuit"},
{ RTP_COT, "Continuity test"},
{ RTP_DEFCOT, "Default continuity tone"},
{ RTP_COTTONE, "Continuity tone (single tone)"},
{ RTP_COTSEND, "Continuity test send"},
{ RTP_COTVERFD, "Continuity verified"},
{ RTP_LOOPBACK, "Loopback"},
{ RTP_MWATTTONE, "Old milliwatt tone (1000 Hz)"},
{ RTP_NEWMWATTTN, "New milliwatt tone (1004 Hz)"},
{ 0, NULL },
};
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