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wireshark/epan/dissectors/packet-sip.c

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/* packet-sip.c
* Routines for the Session Initiation Protocol (SIP) dissection.
* RFCs 3261-3264
*
* TODO: Pay attention to Content-Type: It might not always be SDP.
* Content-Type is fixed, mixed/mode is not handled though.
* hf_ display filters for headers of SIP extension RFCs:
* Done for RFC 3265, RFC 3262
* Use hash table for list of headers
* Add sip msg body dissection based on Content-Type for:
* SDP, MIME, and other types
* Align SIP methods with recent Internet Drafts or RFC
* (SIP INFO, rfc2976 - done)
* (SIP SUBSCRIBE-NOTIFY - done)
* (SIP REFER - done)
* check for other
*
* Copyright 2000, Heikki Vatiainen <hessu@cs.tut.fi>
* Copyright 2001, Jean-Francois Mule <jfm@cablelabs.com>
* Copyright 2004, Anders Broman <anders.broman@ericsson.com>
*
* $Id$
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* Copied from packet-cops.c
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <epan/prefs.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/emem.h>
#include "packet-sip.h"
#include <epan/tap.h>
#include <epan/emem.h>
#define TCP_PORT_SIP 5060
#define UDP_PORT_SIP 5060
static gint sip_tap = -1;
static dissector_handle_t sigcomp_handle;
/* Initialize the protocol and registered fields */
static gint proto_sip = -1;
static gint proto_raw_sip = -1;
static gint hf_msg_hdr = -1;
static gint hf_Method = -1;
static gint hf_Request_Line = -1;
static gint hf_Status_Code = -1;
static gint hf_Status_Line = -1;
static gint hf_sip_display = -1;
static gint hf_sip_to_addr = -1;
static gint hf_sip_from_addr = -1;
static gint hf_sip_tag = -1;
static gint hf_sip_uri = -1;
static gint hf_sip_contact_addr = -1;
static gint hf_sip_contact_item = -1;
static gint hf_sip_resend = -1;
static gint hf_sip_original_frame = -1;
/* Initialize the subtree pointers */
static gint ett_sip = -1;
static gint ett_sip_reqresp = -1;
static gint ett_sip_hdr = -1;
static gint ett_raw_text = -1;
static gint ett_sip_element = -1;
static gint ett_sip_uri = -1;
static gint ett_sip_contact_item = -1;
static gint ett_sip_message_body = -1;
/* PUBLISH method added as per http://www.ietf.org/internet-drafts/draft-ietf-sip-publish-01.txt */
static const char *sip_methods[] = {
"<Invalid method>", /* Pad so that the real methods start at index 1 */
"ACK",
"BYE",
"CANCEL",
"DO",
"INFO",
"INVITE",
"MESSAGE",
"NOTIFY",
"OPTIONS",
"PRACK",
"QAUTH",
"REFER",
"REGISTER",
"SPRACK",
"SUBSCRIBE",
"UPDATE",
"PUBLISH"
};
/* from RFC 3261
* Updated with info from http://www.iana.org/assignments/sip-parameters
* (last updated 2004-10-17)
* Updated with: http://www.ietf.org/internet-drafts/draft-ietf-sip-resource-priority-05.txt
*/
typedef struct {
const char *name;
const char *compact_name;
} sip_header_t;
static const sip_header_t sip_headers[] = {
{ "Unknown-header", NULL }, /* 0 Pad so that the real headers start at index 1 */
{ "Accept", NULL }, /* 1 */
{ "Accept-Contact", "a" }, /* 2 RFC3841 */
{ "Accept-Encoding", NULL }, /* 3 */
{ "Accept-Language", NULL }, /* 4 */
{ "Accept-Resource-Priority", NULL }, /* 5 draft-ietf-sip-resource-priority-05.txt */
{ "Alert-Info", NULL },
{ "Allow", NULL },
{ "Allow-Events", "u" }, /* 8 RFC3265 */
{ "Authentication-Info", NULL },
{ "Authorization", NULL }, /* 10 */
{ "Call-ID", "i" },
{ "Call-Info", NULL },
{ "Contact", "m" },
{ "Content-Disposition", NULL },
{ "Content-Encoding", "e" }, /* 15 */
{ "Content-Language", NULL },
{ "Content-Length", "l" },
{ "Content-Type", "c" },
{ "CSeq", NULL },
{ "Date", NULL }, /* 20 */
{ "Error-Info", NULL },
{ "Event", "o" },
{ "Expires", NULL },
{ "From", "f" },
{ "In-Reply-To", NULL }, /* 25 RFC3261 */
{ "Join", NULL }, /* 26 RFC-ietf-sip-join-03.txt */
{ "Max-Forwards", NULL },
{ "MIME-Version", NULL },
{ "Min-Expires", NULL },
{ "Min-SE", NULL }, /* 30 RFC-ietf-sip-session-timer-15.txt */
{ "Organization", NULL },
{ "P-Access-Network-Info", NULL }, /* 32 RFC3455 */
{ "P-Asserted-Identity", NULL }, /* 33 RFC3325 */
{ "P-Associated-URI", NULL }, /* 34 RFC3455 */
{ "P-Called-Party-ID", NULL }, /* 35 RFC3455 */
{ "P-Charging-Function-Addresses",NULL },/* 36 RFC3455 */
{ "P-Charging-Vector", NULL }, /* 37 RFC3455 */
{ "P-DCS-Trace-Party-ID", NULL }, /* 38 RFC3603 */
{ "P-DCS-OSPS", NULL }, /* 39 RFC3603 */
{ "P-DCS-Billing-Info", NULL }, /* 40 RFC3603 */
{ "P-DCS-LAES", NULL }, /* 41 RFC3603 */
{ "P-DCS-Redirect", NULL }, /* 42 RFC3603 */
{ "P-Media-Authorization", NULL }, /* 43 RFC3313 */
{ "P-Preferred-Identity", NULL }, /* 44 RFC3325 */
{ "P-Visited-Network-ID", NULL }, /* 45 RFC3455 */
{ "Path", NULL }, /* 46 RFC3327 */
{ "Priority", NULL },
{ "Privacy", NULL }, /* 48 RFC3323 */
{ "Proxy-Authenticate", NULL },
{ "Proxy-Authorization", NULL }, /* 50 */
{ "Proxy-Require", NULL },
{ "RAck", NULL },
{ "Reason", NULL }, /* 53 RFC3326 */
{ "Record-Route", NULL },
{ "Referred-By", "b" }, /* 55 RFC3892 */
{ "Reject-Contact", "j" }, /* 56 RFC3841 */
{ "Replaces", NULL }, /* 57 RFC3891 */
{ "Reply-To", NULL }, /* 58 RFC3261 */
{ "Request-Disposition", "d" }, /* 59 RFC3841 */
{ "Require", NULL }, /* 60 RFC3261 */
{ "Resource-Priority", NULL }, /* 61 draft-ietf-sip-resource-priority-05.txt */
{ "Retry-After", NULL }, /* 62 RFC3261 */
{ "Route", NULL }, /* 63 RFC3261 */
{ "RSeq", NULL }, /* 64 RFC3841 */
{ "Security-Client", NULL }, /* 65 RFC3329 */
{ "Security-Server", NULL }, /* 66 RFC3329 */
{ "Security-Verify", NULL }, /* 67 RFC3329 */
{ "Server", NULL }, /* 68 RFC3261 */
{ "Service-Route", NULL }, /* 69 RFC3608 */
{ "Session-Expires", "x" }, /* 70 RFC-ietf-sip-session-timer-15.txt */
{ "SIP-ETag", NULL }, /* 71 draft-ietf-sip-publish-03 */
{ "SIP-If-Match", NULL }, /* 72 draft-ietf-sip-publish-03 */
{ "Subject", "s" }, /* 73 RFC3261 */
{ "Subscription-State", NULL }, /* 74 RFC3265 */
{ "Supported", "k" }, /* 75 RFC3261 */
{ "Timestamp", NULL }, /* 76 RFC3261 */
{ "To", "t" }, /* 77 RFC3261 */
{ "Unsupported", NULL }, /* 78 RFC3261 */
{ "User-Agent", NULL }, /* 79 RFC3261 */
{ "Via", "v" }, /* 80 RFC3261 */
{ "Warning", NULL }, /* 81 RFC3261 */
{ "WWW-Authenticate", NULL }, /* 82 RFC3261 */
{ "Refer-To", "r" }, /* 83 RFC3515 */
};
#define POS_ACCEPT 1
#define POS_ACCEPT_CONTACT 2
#define POS_ACCEPT_ENCODING 3
#define POS_ACCEPT_LANGUAGE 4
#define POS_ACCEPT_RESOURCE_PRIORITY 5
#define POS_ALERT_INFO 6
#define POS_ALLOW 7
#define POS_ALLOW_EVENTS 8
#define POS_AUTHENTICATION_INFO 9
#define POS_AUTHORIZATION 10
#define POS_CALL_ID 11
#define POS_CALL_INFO 12
#define POS_CONTACT 13
#define POS_CONTENT_DISPOSITION 14
#define POS_CONTENT_ENCODING 15
#define POS_CONTENT_LANGUAGE 16
#define POS_CONTENT_LENGTH 17
#define POS_CONTENT_TYPE 18
#define POS_CSEQ 19
#define POS_DATE 20
#define POS_ERROR_INFO 21
#define POS_EVENT 22
#define POS_EXPIRES 23
#define POS_FROM 24
#define POS_IN_REPLY_TO 25
#define POS_JOIN 26
#define POS_MAX_FORWARDS 27
#define POS_MIME_VERSION 28
#define POS_MIN_EXPIRES 29
#define POS_MIN_SE 30
#define POS_ORGANIZATION 31
#define POS_P_ACCESS_NETWORK_INFO 32
#define POS_P_ASSERTED_IDENTITY 33
#define POS_P_ASSOCIATED_URI 34
#define POS_P_CALLED_PARTY_ID 35
#define POS_P_CHARGING_FUNCTION_ADDRESSES 36
#define POS_P_CHARGING_VECTOR 37
#define POS_P_DCS_TRACE_PARTY_ID 38
#define POS_P_DCS_OSPS 39
#define POS_P_DCS_BILLING_INFO 40
#define POS_P_DCS_LAES 41
#define POS_P_DCS_REDIRECT 42
#define POS_P_MEDIA_AUTHORIZATION 43
#define POS_P_PREFERRED_IDENTITY 44
#define POS_P_VISITED_NETWORK_ID 45
#define POS_PATH 46
#define POS_PRIORITY 47
#define POS_PRIVACY 48
#define POS_PROXY_AUTHENTICATE 49
#define POS_PROXY_AUTHORIZATION 50
#define POS_PROXY_REQUIRE 51
#define POS_RACK 52
#define POS_REASON 53
#define POS_RECORD_ROUTE 54
#define POS_REFERED_BY 55
#define POS_REJECT_CONTACT 56
#define POS_REPLACES 57
#define POS_REPLY_TO 58
#define POS_REQUEST_DISPOSITION 59
#define POS_REQUIRE 60
#define POS_RESOURCE_PRIORITY 61
#define POS_RETRY_AFTER 62
#define POS_ROUTE 63
#define POS_RSEQ 64
#define POS_SECURITY_CLIENT 65
#define POS_SECURITY_SERVER 66
#define POS_SECURITY_VERIFY 67
#define POS_SERVER 68
#define POS_SERVICE_ROUTE 69
#define POS_SESSION_EXPIRES 70
#define POS_SIP_ETAG 71
#define POS_SIP_IF_MATCH 72
#define POS_SUBJECT 73
#define POS_SUBSCRIPTION_STATE 74
#define POS_SUPPORTED 75
#define POS_TIMESTAMP 76
#define POS_TO 77
#define POS_UNSUPPORTED 78
#define POS_USER_AGENT 79
#define POS_VIA 80
#define POS_WARNING 81
#define POS_WWW_AUTHENTICATE 82
#define POS_REFER_TO 83
static gint hf_header_array[] = {
-1, /* 0"Unknown-header" - Pad so that the real headers start at index 1 */
-1, /* 1"Accept" */
-1, /* 2"Accept-Contact" RFC3841 */
-1, /* 3"Accept-Encoding" */
-1, /* 4"Accept-Language" */
-1, /* 5"Accept-Resource-Priority" draft-ietf-sip-resource-priority-05.txt */
-1, /* 6"Alert-Info", */
-1, /* 7"Allow", */
-1, /* 8"Allow-Events", RFC3265 */
-1, /* 9"Authentication-Info" */
-1, /* 10"Authorization", */
-1, /* 11"Call-ID", */
-1, /* 12"Call-Info" */
-1, /* 13"Contact", */
-1, /* 14"Content-Disposition", */
-1, /* 15"Content-Encoding", */
-1, /* 16"Content-Language", */
-1, /* 17"Content-Length", */
-1, /* 18"Content-Type", */
-1, /* 19"CSeq", */
-1, /* 20"Date", */
-1, /* 21"Error-Info", */
-1, /* 22"Event", */
-1, /* 23"Expires", */
-1, /* 24"From", */
-1, /* 25"In-Reply-To", RFC3261 */
-1, /* 26"Join", RFC-ietf-sip-join-03.txt */
-1, /* 27"Max-Forwards", */
-1, /* 28"MIME-Version", */
-1, /* 29"Min-Expires", */
-1, /* 30"Min-SE", RFC-ietf-sip-session-timer-15.txt */
-1, /* 31"Organization", */
-1, /* 32"P-Access-Network-Info", RFC3455 */
-1, /* 33"P-Asserted-Identity", RFC3325 */
-1, /* 34"P-Associated-URI", RFC3455 */
-1, /* 35"P-Called-Party-ID", RFC3455 */
-1, /* 36"P-Charging-Function-Addresses", RFC3455 */
-1, /* 37"P-Charging-Vector", RFC3455 */
-1, /* 38"P-DCS-Trace-Party-ID", RFC3603 */
-1, /* 39"P-DCS-OSPS", RFC3603 */
-1, /* 40"P-DCS-Billing-Info", RFC3603 */
-1, /* 41"P-DCS-LAES", RFC3603 */
-1, /* 42"P-DCS-Redirect", RFC3603 */
-1, /* 43"P-Media-Authorization", RFC3313 */
-1, /* 44"P-Preferred-Identity", RFC3325 */
-1, /* 45"P-Visited-Network-ID", RFC3455 */
-1, /* 46"Path", RFC3327 */
-1, /* 47"Priority" */
-1, /* 48"Privacy", RFC3323 */
-1, /* 49"Proxy-Authenticate", */
-1, /* 50"Proxy-Authorization", */
-1, /* 51"Proxy-Require", */
-1, /* 52"RAck", */
-1, /* 53"Reason", RFC3326 */
-1, /* 54"Record-Route", */
-1, /* 55"Referred-By", */
-1, /* 56"Reject-Contact", RFC3841 */
-1, /* 57"Replaces", RFC3891 */
-1, /* 58"Reply-To", RFC3261 */
-1, /* 59"Request-Disposition", RFC3841 */
-1, /* 60"Require", RFC3261 */
-1, /* 61"Resource-Priority",draft-ietf-sip-resource-priority-05.txt */
-1, /* 62"Retry-After", RFC3261 */
-1, /* 63"Route", RFC3261 */
-1, /* 64"RSeq", RFC3841 */
-1, /* 65"Security-Client", RFC3329 */
-1, /* 66"Security-Server", RFC3329 */
-1, /* 67"Security-Verify", RFC3329 */
-1, /* 68"Server", RFC3261 */
-1, /* 69"Service-Route", RFC3608 */
-1, /* 70"Session-Expires", RFC-ietf-sip-session-timer-15.txt */
-1, /* 71"SIP-ETag", draft-ietf-sip-publish-04 */
-1, /* 72"SIP-If-Match", draft-ietf-sip-publish-04 */
-1, /* 73"Subject", RFC3261 */
-1, /* 74"Subscription-State", RFC3265 */
-1, /* 75"Supported", RFC3261 */
-1, /* 76"Timestamp", RFC3261 */
-1, /* 77"To", RFC3261 */
-1, /* 78"Unsupported", RFC3261 */
-1, /* 79"User-Agent", RFC3261 */
-1, /* 80"Via", RFC3261 */
-1, /* 81"Warning", RFC3261 */
-1, /* 82"WWW-Authenticate", RFC3261 */
-1, /* 83"Refer-To", RFC3515 */
};
/*
* Type of line. It's either a SIP Request-Line, a SIP Status-Line, or
* another type of line.
*/
typedef enum {
REQUEST_LINE,
STATUS_LINE,
OTHER_LINE
} line_type_t;
/* global_sip_raw_text determines whether we are going to display */
/* the raw text of the SIP message, much like the MEGACO dissector does. */
static gboolean global_sip_raw_text = FALSE;
/* strict_sip_version determines whether the SIP dissector enforces
* the SIP version to be "SIP/2.0". */
static gboolean strict_sip_version = TRUE;
static gboolean dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree, gboolean is_heur);
static line_type_t sip_parse_line(tvbuff_t *tvb, gint linelen,
guint *token_1_len);
static gboolean sip_is_known_request(tvbuff_t *tvb, int meth_offset,
guint meth_len, guint *meth_idx);
static gint sip_is_known_sip_header(tvbuff_t *tvb, int offset,
guint header_len);
static void dfilter_sip_request_line(tvbuff_t *tvb, proto_tree *tree,
guint meth_len);
static void dfilter_sip_status_line(tvbuff_t *tvb, proto_tree *tree);
static void tvb_raw_text_add(tvbuff_t *tvb, proto_tree *tree);
static guint sip_is_packet_resend(packet_info *pinfo,
gchar* cseq_method,
gchar* call_id,
guchar cseq_number_set, guint32 cseq_number,
line_type_t line_type);
/* SIP content type and internet media type used by other dissectors
* are the same. List of media types from IANA at:
* http://www.iana.org/assignments/media-types/index.html */
static dissector_table_t media_type_dissector_table;
#define SIP2_HDR "SIP/2.0"
#define SIP2_HDR_LEN (strlen (SIP2_HDR))
/* Store the info needed by the SIP tap for one packet */
static sip_info_value_t *stat_info;
/* The buffer size for the cseq_method name */
#define MAX_CSEQ_METHOD_SIZE 16
/****************************************************************************
* Conversation-type definitions
*
* For each call, keep track of the current cseq number and state of
* transaction, in order to be able to detect retransmissions.
*
* Don't use the conservation mechanism, but instead:
* - store with each dissected packet original frame (if any)
* - maintain a global hash table of
* (call_id, source_addr, dest_addr) -> (cseq, transaction_state, frame)
****************************************************************************/
static GHashTable *sip_hash = NULL; /* Hash table */
/* Types for hash table keys and values */
#define MAX_CALL_ID_SIZE 128
typedef struct
{
char call_id[MAX_CALL_ID_SIZE];
address source_address;
guint32 source_port;
address dest_address;
guint32 dest_port;
} sip_hash_key;
typedef enum
{
nothing_seen,
request_seen,
provisional_response_seen,
final_response_seen
} transaction_state_t;
typedef struct
{
guint32 cseq;
transaction_state_t transaction_state;
guint32 response_code;
gint frame_number;
} sip_hash_value;
/************************/
/* Hash table functions */
/* Equal keys */
static gint sip_equal(gconstpointer v, gconstpointer v2)
{
const sip_hash_key* val1 = v;
const sip_hash_key* val2 = v2;
/* Call id must match */
if (strcmp(val1->call_id, val2->call_id) != 0)
{
return 0;
}
/* Addresses must match */
return (ADDRESSES_EQUAL(&(val1->source_address), &(val2->source_address))) &&
(val1->source_port == val2->source_port) &&
(ADDRESSES_EQUAL(&(val1->dest_address), &(val2->dest_address))) &&
(val1->dest_port == val2->dest_port);
}
/* Compute a hash value for a given key. */
/* Don't try to use addresses here, call-id should be almost unique. */
static guint sip_hash_func(gconstpointer v)
{
gint n;
const sip_hash_key *key = v;
guint value = strlen(key->call_id);
gint chars_to_use = value / 4;
/* First few characters from the call-id should be enough... */
for (n=0; n < chars_to_use; n++)
{
value += key->call_id[n];
}
return value;
}
/* Initializes the hash table and the mem_chunk area each time a new
* file is loaded or re-loaded in ethereal */
static void
sip_init_protocol(void)
{
/* Destroy any existing hashes. */
if (sip_hash)
g_hash_table_destroy(sip_hash);
/* Now create them over */
sip_hash = g_hash_table_new(sip_hash_func, sip_equal);
}
/*
* Copied from the mgcp dissector. (This function should be moved to /epan )
* tvb_skip_wsp - Returns the position in tvb of the first non-whitespace
* character following offset or offset + maxlength -1 whichever
* is smaller.
*
* Parameters:
* tvb - The tvbuff in which we are skipping whitespace.
* offset - The offset in tvb from which we begin trying to skip whitespace.
* maxlength - The maximum distance from offset that we may try to skip
* whitespace.
*
* Returns: The position in tvb of the first non-whitespace
* character following offset or offset + maxlength -1 whichever
* is smaller.
*/
static gint tvb_skip_wsp(tvbuff_t* tvb, gint offset, gint maxlength)
{
gint counter = offset;
gint end = offset + maxlength,tvb_len;
guint8 tempchar;
/* Get the length remaining */
tvb_len = tvb_length(tvb);
end = offset + maxlength;
if (end >= tvb_len)
{
end = tvb_len;
}
/* Skip past spaces and tabs until run out or meet something else */
for (counter = offset;
counter < end &&
((tempchar = tvb_get_guint8(tvb,counter)) == ' ' ||
tempchar == '\t');
counter++);
return (counter);
}
/* Structure to collect info about a sip uri */
typedef struct _uri_offset_info
{
gint display_name_start;
gint display_name_end;
gint uri_start;
gint uri_end;
gint uri_parameters_start;
gint uri_parameters_end;
gint name_addr_start;
gint name_addr_end;
} uri_offset_info;
/* Code to parse a sip uri.
* Returns Offset end off parsing or -1 for unsuccessful parsing
*/
static gint
dissect_sip_uri(tvbuff_t *tvb, packet_info *pinfo _U_, gint start_offset,
gint line_end_offset, uri_offset_info *uri_offsets)
{
gchar c;
gint i;
gint current_offset;
gint queried_offset;
gint colon_offset;
gint comma_offset;
gint semicolon_offset;
gint question_mark_offset;
gboolean uri_without_angle_quotes = FALSE;
/* skip Spaces and Tabs */
current_offset = tvb_skip_wsp(tvb, start_offset, line_end_offset - start_offset);
if(current_offset >= line_end_offset) {
/* Nothing to parse */
return -1;
}
uri_offsets->name_addr_start = current_offset;
/* First look, if we have a display name */
c=tvb_get_guint8(tvb, current_offset);
switch(c)
{
case '"':
/* We have a display name, look for the next unescaped '"' */
uri_offsets->display_name_start = current_offset;
do
{
queried_offset = tvb_find_guint8(tvb, current_offset + 1, line_end_offset - (current_offset + 1), '"');
if(queried_offset == -1)
{
/* malformed URI */
return -1;
}
current_offset = queried_offset;
/* Is it escaped? */
/* count back slashes before '"' */
for(i=1;tvb_get_guint8(tvb, queried_offset - i) == '\\';i++);
i--;
if(i % 2 == 0)
{
/* not escaped */
break;
}
} while (current_offset < line_end_offset);
if(current_offset >= line_end_offset)
{
/* malformed URI */
return -1;
}
uri_offsets->display_name_end = current_offset;
/* find start of the URI */
queried_offset = tvb_find_guint8(tvb, current_offset, line_end_offset - current_offset, '<');
if(queried_offset == -1)
{
/* malformed Uri */
return -1;
}
current_offset = queried_offset + 1;
break;
case '<':
/* We don't have a display name */
current_offset++;
break;
default:
/* We have either an URI without angles or a display name with a limited character set */
/* Look for the right angle quote or colon */
queried_offset = tvb_find_guint8(tvb, current_offset, line_end_offset - current_offset, '<');
colon_offset = tvb_find_guint8(tvb, current_offset, line_end_offset - current_offset, ':');
if(queried_offset != -1 && colon_offset != -1)
{
if(queried_offset < colon_offset)
{
/* we have an URI with angle quotes */
uri_offsets->display_name_start = current_offset;
uri_offsets->display_name_end = queried_offset - 1;
current_offset = queried_offset + 1;
}
else
{
/* we have an URI without angle quotes */
uri_without_angle_quotes = TRUE;
}
}
else
{
if(queried_offset != -1)
{
/* we have an URI with angle quotes */
uri_offsets->display_name_start = current_offset;
uri_offsets->display_name_end = queried_offset - 1;
current_offset = queried_offset + 1;
break;
}
if(colon_offset != -1)
{
/* we have an URI without angle quotes */
uri_without_angle_quotes = TRUE;
break;
}
/* If this point is reached, we can't parse the URI */
return -1;
}
break;
}
/* Start parsing of URI */
uri_offsets->uri_start = current_offset;
if(uri_without_angle_quotes == TRUE)
{
/* look for the first ',' or ';' which will mark the end of this URI
* In this case a semicolon indicates a header field parameter, and not an uri parameter.
*/
comma_offset = tvb_find_guint8(tvb, current_offset, line_end_offset - current_offset, ',');
semicolon_offset = tvb_find_guint8(tvb, current_offset, line_end_offset - current_offset, ';');
if (semicolon_offset != -1 && comma_offset != -1)
{
if(semicolon_offset < comma_offset)
{
uri_offsets->uri_end = semicolon_offset - 1;
}
else
{
uri_offsets->uri_end = comma_offset - 1;
}
}
else
{
if (semicolon_offset != -1)
{
uri_offsets->uri_end = semicolon_offset - 1;
}
if (comma_offset != -1)
{
uri_offsets->uri_end = comma_offset - 1;
}
/* If both offsets are equal to -1, we don't have a semicolon or a comma.
* In that case, we assume that the end of the URI is at the line end
*/
uri_offsets->uri_end = line_end_offset - 2;
}
uri_offsets->name_addr_end = uri_offsets->uri_end;
current_offset = uri_offsets->uri_end + 1; /* Now save current_offset, as it is the value to be returned now */
}
else
{
/* look for closing angle quote */
queried_offset = tvb_find_guint8(tvb, current_offset, line_end_offset - current_offset, '>');
if(queried_offset == -1)
{
/* malformed Uri */
return -1;
}
uri_offsets->name_addr_end = queried_offset;
uri_offsets->uri_end = queried_offset - 1;
current_offset = queried_offset; /* Now save current_offset. It contains the value we have to return */
/* Look for '@' within URI */
queried_offset = tvb_find_guint8(tvb, uri_offsets->uri_start, uri_offsets->uri_end - uri_offsets->uri_start, '@');
if(queried_offset == -1)
{
/* no '@': look for the first ';' or '?' in the URI */
question_mark_offset = tvb_find_guint8(tvb, uri_offsets->uri_start, uri_offsets->uri_end - uri_offsets->uri_start, '?');
semicolon_offset = tvb_find_guint8(tvb, uri_offsets->uri_start, uri_offsets->uri_end - uri_offsets->uri_start, ';');
}
else
{
/* with '@': look for the first ';' or '?' behind the '@' */
question_mark_offset = tvb_find_guint8(tvb, queried_offset, uri_offsets->uri_end - queried_offset, '?');
semicolon_offset = tvb_find_guint8(tvb, queried_offset, uri_offsets->uri_end - queried_offset, ';');
}
/* Set Parameter*/
if (semicolon_offset != -1 && question_mark_offset != -1)
{
if(semicolon_offset < question_mark_offset)
{
uri_offsets->uri_parameters_start = semicolon_offset;
}
else
{
uri_offsets->uri_parameters_start = question_mark_offset;
}
uri_offsets->uri_parameters_end = uri_offsets->uri_end;
uri_offsets->uri_end = uri_offsets->uri_parameters_start - 1;
}
else
{
if (semicolon_offset != -1)
{
uri_offsets->uri_parameters_start = semicolon_offset;
uri_offsets->uri_parameters_end = uri_offsets->uri_end;
uri_offsets->uri_end = uri_offsets->uri_parameters_start - 1;
}
if (question_mark_offset != -1)
{
uri_offsets->uri_parameters_start = question_mark_offset;
uri_offsets->uri_parameters_end = uri_offsets->uri_end;
uri_offsets->uri_end = uri_offsets->uri_parameters_start - 1;
}
/* If both offsets are equal to -1, we don't have a semicolon or a question mark.
* In that case, we don't have to save any offsets.
*/
}
}
return current_offset;
}
/* Code to parse a contact header item
* Returns Offset end off parsing or -1 for unsuccessful parsing
*/
static gint
dissect_sip_contact_item(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint start_offset, gint line_end_offset)
{
gchar c;
proto_item *ti = NULL;
proto_tree *contact_item_tree = NULL, *uri_tree = NULL;
gint current_offset;
gint queried_offset;
gint contact_params_start_offset = -1;
gint contact_item_end_offset = -1;
uri_offset_info uri_offsets;
uri_offsets.display_name_start = -1;
uri_offsets.display_name_end = -1;
uri_offsets.uri_start = -1;
uri_offsets.uri_end = -1;
uri_offsets.uri_parameters_start = -1;
uri_offsets.uri_parameters_end = -1;
uri_offsets.name_addr_start = -1;
uri_offsets.name_addr_end = -1;
/* skip Spaces and Tabs */
start_offset = tvb_skip_wsp(tvb, start_offset, line_end_offset - start_offset);
if(start_offset >= line_end_offset) {
/* Nothing to parse */
return -1;
}
current_offset = dissect_sip_uri(tvb, pinfo, start_offset, line_end_offset, &uri_offsets);
if(current_offset == -1)
{
/* Parsing failed */
return -1;
}
/* Now look for the end of the contact item */
while (current_offset < line_end_offset)
{
c=tvb_get_guint8(tvb, current_offset);
if(c == ';' && contact_params_start_offset == -1)
{
/* here we start with contact parameters */
contact_params_start_offset = current_offset;
}
if(c == '"')
{
/* look for the next unescaped '"' */
do
{
queried_offset = tvb_find_guint8(tvb, current_offset + 1, line_end_offset - (current_offset + 1), '"');
if(queried_offset == -1)
{
/* malformed URI */
return -1;
}
current_offset = queried_offset;
/* Is it escaped? */
} while (tvb_get_guint8(tvb, queried_offset - 1) == '\\');
}
if(c == ',')
{
/* end of contact item found. */
contact_item_end_offset = current_offset - 1; /* remove ',' */
break;
}
current_offset++;
}
if(contact_item_end_offset == -1)
contact_item_end_offset = line_end_offset - 3; /* remove '\r\n' */
/* Build the tree, now */
if(tree)
{
ti = proto_tree_add_string(tree, hf_sip_contact_item, tvb, start_offset, contact_item_end_offset - start_offset + 1,
tvb_format_text(tvb, start_offset, contact_item_end_offset - start_offset + 1));
contact_item_tree = proto_item_add_subtree(ti, ett_sip_contact_item);
ti = proto_tree_add_string(contact_item_tree, hf_sip_uri, tvb, uri_offsets.name_addr_start, uri_offsets.name_addr_end - uri_offsets.name_addr_start + 1,
tvb_format_text(tvb, uri_offsets.name_addr_start, uri_offsets.name_addr_end - uri_offsets.name_addr_start + 1));
uri_tree = proto_item_add_subtree(ti, ett_sip_uri);
if(uri_offsets.display_name_start != -1 && uri_offsets.display_name_end != -1)
{
proto_tree_add_string(uri_tree, hf_sip_display, tvb, uri_offsets.display_name_start,
uri_offsets.display_name_end - uri_offsets.display_name_start + 1,
tvb_format_text(tvb, uri_offsets.display_name_start,
uri_offsets.display_name_end - uri_offsets.display_name_start + 1));
}
if(uri_offsets.uri_start != -1 && uri_offsets.uri_end != -1)
{
proto_tree_add_string(uri_tree, hf_sip_contact_addr, tvb, uri_offsets.uri_start,
uri_offsets.uri_end - uri_offsets.uri_start + 1,
tvb_format_text(tvb, uri_offsets.uri_start,
uri_offsets.uri_end - uri_offsets.uri_start + 1));
}
/* Parse URI and Contact header Parameters now */
/* TODO */
}
return current_offset;
}
/* Code to actually dissect the packets */
static int
dissect_sip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 octet;
octet = tvb_get_guint8(tvb,0);
if ((octet & 0xf8) == 0xf8){
call_dissector(sigcomp_handle, tvb, pinfo, tree);
return tvb_length(tvb);
}
if (!dissect_sip_common(tvb, pinfo, tree, FALSE))
return 0;
return tvb_length(tvb);
}
static void
dissect_sip_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 octet;
octet = tvb_get_guint8(tvb,0);
if ((octet & 0xf8) == 0xf8){
call_dissector(sigcomp_handle, tvb, pinfo, tree);
return;
}
dissect_sip_common(tvb, pinfo, tree, TRUE);
}
static gboolean
dissect_sip_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
return dissect_sip_common(tvb, pinfo, tree, FALSE);
}
static gboolean
dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
gboolean dissect_other_as_continuation)
{
int offset;
gint next_offset, linelen;
line_type_t line_type;
tvbuff_t *next_tvb;
gboolean is_known_request;
gboolean found_match = FALSE;
const char *descr;
guint token_1_len = 0;
guint current_method_idx = 0;
proto_item *ts = NULL, *ti = NULL, *th = NULL, *sip_element_item = NULL;
proto_tree *sip_tree = NULL, *reqresp_tree = NULL , *hdr_tree = NULL, *sip_element_tree = NULL, *message_body_tree = NULL;
guchar contacts = 0, contact_is_star = 0, expires_is_0 = 0;
guint32 cseq_number = 0;
guchar cseq_number_set = 0;
char cseq_method[MAX_CSEQ_METHOD_SIZE] = "";
char call_id[MAX_CALL_ID_SIZE] = "";
char *media_type_str = NULL;
char *media_type_str_lower_case = NULL;
char *content_type_parameter_str = NULL;
guint resend_for_packet = 0;
int strlen_to_copy;
/* Initialise stat info for passing to tap */
stat_info = ep_alloc(sizeof(sip_info_value_t));
stat_info->response_code = 0;
stat_info->request_method = NULL;
stat_info->reason_phrase = NULL;
stat_info->resend = 0;
stat_info->tap_call_id = NULL;
stat_info->tap_from_addr = NULL;
stat_info->tap_to_addr = NULL;
/*
* Note that "tvb_find_line_end()" will return a value that
* is not longer than what's in the buffer, so the
* "tvb_get_ptr()" calls below won't throw exceptions.
*
* Note that "tvb_strneql()" doesn't throw exceptions, so
* "sip_parse_line()" won't throw an exception.
*/
offset = 0;
linelen = tvb_find_line_end(tvb, 0, -1, &next_offset, FALSE);
line_type = sip_parse_line(tvb, linelen, &token_1_len);
if (line_type == OTHER_LINE) {
/*
* This is neither a SIP request nor response.
*/
if (!dissect_other_as_continuation) {
/*
* We were asked to reject this.
*/
return FALSE;
}
/*
* Just dissect it as a continuation.
*/
}
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "SIP");
switch (line_type) {
case REQUEST_LINE:
is_known_request = sip_is_known_request(tvb, 0, token_1_len, &current_method_idx);
descr = is_known_request ? "Request" : "Unknown request";
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %s",
descr,
tvb_format_text(tvb, 0, linelen - SIP2_HDR_LEN - 1));
}
break;
case STATUS_LINE:
descr = "Status";
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_fstr(pinfo->cinfo, COL_INFO, "Status: %s",
tvb_format_text(tvb, SIP2_HDR_LEN + 1, linelen - SIP2_HDR_LEN - 1));
}
stat_info->reason_phrase = tvb_get_ephemeral_string(tvb, SIP2_HDR_LEN + 5, linelen - (SIP2_HDR_LEN + 5));
break;
case OTHER_LINE:
default: /* Squelch compiler complaints */
descr = "Continuation";
if (check_col(pinfo->cinfo, COL_INFO))
col_set_str(pinfo->cinfo, COL_INFO, "Continuation");
break;
}
if (tree) {
ts = proto_tree_add_item(tree, proto_sip, tvb, 0, -1, FALSE);
sip_tree = proto_item_add_subtree(ts, ett_sip);
}
switch (line_type) {
case REQUEST_LINE:
if (sip_tree) {
ti = proto_tree_add_string(sip_tree, hf_Request_Line, tvb, 0, linelen,
tvb_format_text(tvb, 0, linelen));
reqresp_tree = proto_item_add_subtree(ti, ett_sip_reqresp);
}
dfilter_sip_request_line(tvb, reqresp_tree, token_1_len);
break;
case STATUS_LINE:
if (sip_tree) {
ti = proto_tree_add_string(sip_tree, hf_Status_Line, tvb, 0, linelen,
tvb_format_text(tvb, 0, linelen));
reqresp_tree = proto_item_add_subtree(ti, ett_sip_reqresp);
}
dfilter_sip_status_line(tvb, reqresp_tree);
break;
case OTHER_LINE:
if (sip_tree) {
ti = proto_tree_add_text(sip_tree, tvb, 0, next_offset,
"%s line: %s", descr,
tvb_format_text(tvb, 0, linelen));
reqresp_tree = proto_item_add_subtree(ti, ett_sip_reqresp);
proto_tree_add_text(sip_tree, tvb, 0, -1,
"Continuation data");
}
return TRUE;
}
offset = next_offset;
if (sip_tree) {
th = proto_tree_add_item(sip_tree, hf_msg_hdr, tvb, offset, -1, FALSE);
hdr_tree = proto_item_add_subtree(th, ett_sip_hdr);
}
/*
* Process the headers - if we're not building a protocol tree,
* we just do this to find the blank line separating the
* headers from the message body.
*/
next_offset = offset;
while (tvb_reported_length_remaining(tvb, offset) > 0) {
gint line_end_offset;
gint colon_offset;
gint semi_colon_offset;
gint len;
gint parameter_offset;
gint parameter_end_offset;
gint parameter_len;
gint content_type_len, content_type_parameter_str_len;
gint header_len;
gint hf_index;
gint value_offset;
gint comma_offset;
guchar c;
size_t value_len;
char *value;
linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
if (linelen == 0) {
/*
* This is a blank line separating the
* message header from the message body.
*/
break;
}
line_end_offset = offset + linelen;
colon_offset = tvb_find_guint8(tvb, offset, linelen, ':');
if (colon_offset == -1) {
/*
* Malformed header - no colon after the name.
*/
if(hdr_tree) {
proto_tree_add_text(hdr_tree, tvb, offset,
next_offset - offset, "%s",
tvb_format_text(tvb, offset, linelen));
}
} else {
header_len = colon_offset - offset;
hf_index = sip_is_known_sip_header(tvb, offset, header_len);
if (hf_index == -1) {
if(hdr_tree) {
proto_tree_add_text(hdr_tree, tvb,
offset, next_offset - offset, "%s",
tvb_format_text(tvb, offset, linelen));
}
} else {
/*
* Skip whitespace after the colon.
*/
value_offset = colon_offset + 1;
while (value_offset < line_end_offset &&
((c = tvb_get_guint8(tvb, value_offset)) == ' ' ||
c == '\t'))
value_offset++;
/*
* Fetch the value.
*/
value_len = line_end_offset - value_offset;
value = tvb_get_ephemeral_string(tvb, value_offset,
value_len);
/*
* Add it to the protocol tree,
* but display the line as is.
*/
switch ( hf_index ) {
case POS_TO :
if(hdr_tree) {
sip_element_item = proto_tree_add_string_format(hdr_tree,
hf_header_array[hf_index], tvb,
offset, next_offset - offset,
value, "%s",
tvb_format_text(tvb, offset, linelen));
sip_element_tree = proto_item_add_subtree( sip_element_item,
ett_sip_element);
}
/* See if we have a SIP/SIPS uri enclosed in <>, if so anything in front is
* display info.
*/
parameter_offset = tvb_find_guint8(tvb, value_offset,value_len, '<');
if ( parameter_offset != -1){
len = parameter_offset - value_offset;
if ( len > 1){
/* Something in front, must be display info
* TODO: Get rid of trailing space(s)
*/
proto_tree_add_item(sip_element_tree, hf_sip_display, tvb, value_offset,
len, FALSE);
}
parameter_offset ++;
parameter_end_offset = parameter_offset;
/* RFC3261 paragraph 20
* The Contact, From, and To header fields contain a URI. If the URI
* contains a comma, question mark or semicolon, the URI MUST be
* enclosed in angle brackets (< and >). Any URI parameters are
* contained within these brackets. If the URI is not enclosed in angle
* brackets, any semicolon-delimited parameters are header-parameters,
* not URI parameters.
*/
while (parameter_end_offset < line_end_offset){
parameter_end_offset++;
c = tvb_get_guint8(tvb, parameter_end_offset);
switch (c) {
case '>':
case ',':
case ';':
case '?':
goto separator_found;
default :
break;
}
}
separator_found:
parameter_len = parameter_end_offset - parameter_offset;
proto_tree_add_item(sip_element_tree, hf_sip_to_addr, tvb, parameter_offset,
parameter_len, FALSE);
/*info for the tap for voip_calls.c*/
stat_info->tap_to_addr=tvb_get_ephemeral_string(tvb, parameter_offset, parameter_len);
parameter_offset = parameter_end_offset + 1;
/*
* URI parameters ?
*/
parameter_end_offset = tvb_find_guint8(tvb, parameter_offset,( line_end_offset - parameter_offset), ';');
if ( parameter_end_offset == -1)
parameter_end_offset = line_end_offset;
offset = parameter_end_offset;
}
else
{
/* Extract SIP/SIPS URI */
parameter_offset = value_offset;
while (parameter_offset < line_end_offset
&& (tvb_strneql(tvb, parameter_offset, "sip", 3) != 0))
parameter_offset++;
len = parameter_offset - value_offset;
if ( len > 1){
/* Something in front, must be display info
* TODO: Get rid of trailing space(s)
*/
proto_tree_add_item(sip_element_tree, hf_sip_display, tvb, value_offset,
len, FALSE);
}
parameter_end_offset = tvb_find_guint8(tvb, parameter_offset,
(line_end_offset - parameter_offset), ';');
if ( parameter_end_offset == -1)
parameter_end_offset = line_end_offset;
parameter_len = parameter_end_offset - parameter_offset;
proto_tree_add_item(sip_element_tree, hf_sip_to_addr, tvb, parameter_offset,
parameter_len, FALSE);
/*info for the tap for voip_calls.c*/
stat_info->tap_to_addr=tvb_get_ephemeral_string(tvb, parameter_offset, parameter_len);
offset = parameter_end_offset;
}
/* Find parameter tag if present.
* TODO make this generic to find any interesting parameter
* use the same method as for SIP headers ?
*/
parameter_offset = offset;
while (parameter_offset < line_end_offset
&& (tvb_strneql(tvb, parameter_offset, "tag=", 4) != 0))
parameter_offset++;
if ( parameter_offset < line_end_offset ){ /* Tag found */
parameter_offset = parameter_offset + 4;
parameter_end_offset = tvb_find_guint8(tvb, parameter_offset,
(line_end_offset - parameter_offset), ';');
if ( parameter_end_offset == -1)
parameter_end_offset = line_end_offset;
parameter_len = parameter_end_offset - parameter_offset;
proto_tree_add_item(sip_element_tree, hf_sip_tag, tvb, parameter_offset,
parameter_len, FALSE);
}
break;
case POS_FROM :
if(hdr_tree) {
sip_element_item = proto_tree_add_string_format(hdr_tree,
hf_header_array[hf_index], tvb,
offset, next_offset - offset,
value, "%s",
tvb_format_text(tvb, offset, linelen));
sip_element_tree = proto_item_add_subtree( sip_element_item, ett_sip_element);
}
/* See if we have a SIP/SIPS uri enclosed in <>, if so anything in front is
* display info.
*/
parameter_offset = tvb_find_guint8(tvb, value_offset,value_len, '<');
if ( parameter_offset != -1){
len = parameter_offset - value_offset;
if ( len > 1){
/* Something in front, must be display info
* TODO: Get rid of trailing space(s)
*/
proto_tree_add_item(sip_element_tree, hf_sip_display, tvb, value_offset,
len, FALSE);
}
parameter_offset ++;
parameter_end_offset = parameter_offset;
/* RFC3261 paragraph 20
* The Contact, From, and To header fields contain a URI. If the URI
* contains a comma, question mark or semicolon, the URI MUST be
* enclosed in angle brackets (< and >). Any URI parameters are
* contained within these brackets. If the URI is not enclosed in angle
* brackets, any semicolon-delimited parameters are header-parameters,
* not URI parameters.
*/
while (parameter_end_offset < line_end_offset){
parameter_end_offset++;
c = tvb_get_guint8(tvb, parameter_end_offset);
switch (c) {
case '>':
case ',':
case ';':
case '?':
goto separator_found2;
default :
break;
}
}
separator_found2:
parameter_len = parameter_end_offset - parameter_offset;
dfilter_store_sip_from_addr(tvb, sip_element_tree,
parameter_offset, parameter_len);
/*info for the tap for voip_calls.c*/
stat_info->tap_from_addr=tvb_get_ephemeral_string(tvb, parameter_offset, parameter_len);
parameter_offset = parameter_end_offset + 1;
/*
* URI parameters ?
*/
parameter_end_offset = tvb_find_guint8(tvb, parameter_offset,( line_end_offset - parameter_offset), ';');
if ( parameter_end_offset == -1)
parameter_end_offset = line_end_offset;
offset = parameter_end_offset;
}
else
{
/* Extract SIP/SIPS URI */
parameter_offset = value_offset;
while (parameter_offset < line_end_offset
&& (tvb_strneql(tvb, parameter_offset, "sip", 3) != 0))
parameter_offset++;
len = parameter_offset - value_offset;
if ( len > 1){
/* Something in front, must be display info
* TODO: Get rid of trailing space(s)
*/
proto_tree_add_item(sip_element_tree, hf_sip_display, tvb, value_offset,
len, FALSE);
}
parameter_end_offset = tvb_find_guint8(tvb, parameter_offset,
(line_end_offset - parameter_offset), ';');
if ( parameter_end_offset == -1)
parameter_end_offset = line_end_offset;
parameter_len = parameter_end_offset - parameter_offset;
proto_tree_add_item(sip_element_tree, hf_sip_from_addr, tvb, parameter_offset,
parameter_len, FALSE);
/*info for the tap for voip_calls.c*/
stat_info->tap_from_addr=tvb_get_ephemeral_string(tvb, parameter_offset, parameter_len);
offset = parameter_end_offset;
}
/* Find parameter tag if present.
* TODO make this generic to find any interesting parameter
* use the same method as for SIP headers ?
*/
parameter_offset = offset;
while (parameter_offset < line_end_offset
&& (tvb_strneql(tvb, parameter_offset, "tag=", 4) != 0))
parameter_offset++;
if ( parameter_offset < line_end_offset ){ /* Tag found */
parameter_offset = parameter_offset + 4;
parameter_end_offset = tvb_find_guint8(tvb, parameter_offset,
(line_end_offset - parameter_offset), ';');
if ( parameter_end_offset == -1)
parameter_end_offset = line_end_offset;
parameter_len = parameter_end_offset - parameter_offset;
proto_tree_add_item(sip_element_tree, hf_sip_tag, tvb, parameter_offset,
parameter_len, FALSE);
}
break;
case POS_CSEQ :
/* Store the sequence number */
cseq_number = atoi(value);
cseq_number_set = 1;
stat_info->tap_cseq_number=cseq_number;
/* Walk past number and spaces characters to get to start
of method name */
for (value_offset=0; value_offset < (gint)strlen(value); value_offset++)
{
if (isalpha((guchar)value[value_offset]))
{
break;
}
}
if (value_offset == (gint)strlen(value))
{
THROW(ReportedBoundsError);
return TRUE;
}
/* Extract method name from value */
strlen_to_copy = strlen(value)-value_offset+1;
if (strlen_to_copy > MAX_CSEQ_METHOD_SIZE) {
/* Note the error in the protocol tree */
if(hdr_tree) {
proto_tree_add_string_format(hdr_tree,
hf_header_array[hf_index], tvb,
offset, next_offset - offset,
value+value_offset, "%s String too big: %d bytes",
sip_headers[POS_CSEQ].name,
strlen_to_copy);
}
THROW(ReportedBoundsError);
return TRUE;
}
else {
strncpy(cseq_method, value+value_offset, MIN(strlen_to_copy, MAX_CSEQ_METHOD_SIZE));
/* Add 'CSeq' string item to tree */
if(hdr_tree) {
proto_tree_add_string_format(hdr_tree,
hf_header_array[hf_index], tvb,
offset, next_offset - offset,
value, "%s",
tvb_format_text(tvb, offset, linelen));
}
}
break;
case POS_CALL_ID :
/* Store the Call-id */
strncpy(call_id, value,
strlen(value)+1 < MAX_CALL_ID_SIZE ?
strlen(value)+1 :
MAX_CALL_ID_SIZE);
stat_info->tap_call_id = ep_strdup(call_id);
/* Add 'Call-id' string item to tree */
if(hdr_tree) {
proto_tree_add_string_format(hdr_tree,
hf_header_array[hf_index], tvb,
offset, next_offset - offset,
value, "%s",
tvb_format_text(tvb, offset, linelen));
}
break;
case POS_EXPIRES :
if (strcmp(value, "0") == 0)
{
expires_is_0 = 1;
}
/* Add 'Expires' string item to tree */
if(hdr_tree) {
proto_tree_add_string_format(hdr_tree,
hf_header_array[hf_index], tvb,
offset, next_offset - offset,
value, "%s",
tvb_format_text(tvb, offset, linelen));
}
break;
/*
* Content-Type is the same as Internet
* media type used by other dissectors,
* appropriate dissector found by
* lookup in "media_type" dissector table.
*/
case POS_CONTENT_TYPE :
if(hdr_tree) {
proto_tree_add_string_format(hdr_tree,
hf_header_array[hf_index], tvb,
offset, next_offset - offset,
value, "%s",
tvb_format_text(tvb, offset, linelen));
}
content_type_len = value_len;
semi_colon_offset = tvb_find_guint8(tvb, value_offset,linelen, ';');
if ( semi_colon_offset != -1) {
parameter_offset = semi_colon_offset +1;
/*
* Skip whitespace after the semicolon.
*/
while (parameter_offset < line_end_offset
&& ((c = tvb_get_guint8(tvb, parameter_offset)) == ' '
|| c == '\t'))
parameter_offset++;
content_type_len = semi_colon_offset - value_offset;
content_type_parameter_str_len = line_end_offset - parameter_offset;
content_type_parameter_str = tvb_get_ephemeral_string(tvb, parameter_offset,
content_type_parameter_str_len);
}
media_type_str = tvb_get_ephemeral_string(tvb, value_offset, content_type_len);
#if GLIB_MAJOR_VERSION < 2
media_type_str_lower_case = ep_strdup(media_type_str);
g_strdown(media_type_str_lower_case);
#else
media_type_str_lower_case = g_ascii_strdown(media_type_str, -1);
#endif
break;
case POS_CONTACT :
if(hdr_tree) {
sip_element_item = proto_tree_add_string_format(hdr_tree,
hf_header_array[hf_index], tvb,
offset, next_offset - offset,
value, "%s",
tvb_format_text(tvb, offset, linelen));
sip_element_tree = proto_item_add_subtree( sip_element_item,
ett_sip_element);
}
if (strcmp(value, "*") == 0)
{
contact_is_star = 1;
break;
}
comma_offset = value_offset;
while((comma_offset = dissect_sip_contact_item(tvb, pinfo, sip_element_tree, comma_offset, next_offset)) != -1)
{
contacts++;
if(comma_offset == next_offset)
{
/* Line End reached: Stop Parsing */
break;
}
if(tvb_get_guint8(tvb, comma_offset) != ',')
{
/* Undefined value reached: Stop Parsing */
break;
}
comma_offset++; /* skip comma */
}
break;
default :
if(hdr_tree) {
proto_tree_add_string_format(hdr_tree,
hf_header_array[hf_index], tvb,
offset, next_offset - offset,
value, "%s",
tvb_format_text(tvb, offset, linelen));
}
break;
}/* end switch */
}/*if HF_index */
}/* if colon_offset */
offset = next_offset;
}/* End while */
if (tvb_offset_exists(tvb, next_offset)) {
/*
* There's a message body starting at "next_offset".
* Set the length of the header item.
*/
proto_item_set_end(th, tvb, next_offset);
next_tvb = tvb_new_subset(tvb, next_offset, -1, -1);
if(sip_tree) {
ti = proto_tree_add_text(sip_tree, next_tvb, 0, -1,
"Message body");
message_body_tree = proto_item_add_subtree(ti, ett_sip_message_body);
}
/* give the content type parameters to sub dissectors */
if ( media_type_str_lower_case != NULL ) {
void *save_private_data = pinfo->private_data;
pinfo->private_data = content_type_parameter_str;
found_match = dissector_try_string(media_type_dissector_table,
media_type_str_lower_case,
next_tvb, pinfo,
message_body_tree);
pinfo->private_data = save_private_data;
/* If no match dump as text */
}
if ( found_match != TRUE )
{
offset = 0;
while (tvb_offset_exists(next_tvb, offset)) {
tvb_find_line_end(next_tvb, offset, -1, &next_offset, FALSE);
linelen = next_offset - offset;
if(message_body_tree) {
proto_tree_add_text(message_body_tree, next_tvb, offset, linelen,
"%s", tvb_format_text(next_tvb, offset, linelen));
}
offset = next_offset;
}/* end while */
}
}
/* Add to info column interesting things learned from header fields. */
if (check_col(pinfo->cinfo, COL_INFO))
{
/* Registration requests */
if (strcmp(sip_methods[current_method_idx], "REGISTER") == 0)
{
if (contact_is_star && expires_is_0)
{
col_append_str(pinfo->cinfo, COL_INFO, " (remove all bindings)");
}
else
if (!contacts)
{
col_append_str(pinfo->cinfo, COL_INFO, " (fetch bindings)");
}
}
/* Registration responses */
if (line_type == STATUS_LINE && (strcmp(cseq_method, "REGISTER") == 0))
{
col_append_fstr(pinfo->cinfo, COL_INFO, " (%d bindings)", contacts);
}
}
/* Check if this packet is a resend. */
resend_for_packet = sip_is_packet_resend(pinfo, cseq_method, call_id,
cseq_number_set, cseq_number,
line_type);
/* Mark whether this is a resend for the tap */
stat_info->resend = (resend_for_packet > 0);
/* And add the filterable field to the request/response line */
if (reqresp_tree)
{
proto_item *item;
item = proto_tree_add_boolean(reqresp_tree, hf_sip_resend, tvb, 0, 0,
resend_for_packet > 0);
PROTO_ITEM_SET_GENERATED(item);
if (resend_for_packet > 0)
{
item = proto_tree_add_uint(reqresp_tree, hf_sip_original_frame,
tvb, 0, 0, resend_for_packet);
PROTO_ITEM_SET_GENERATED(item);
}
}
if (global_sip_raw_text)
tvb_raw_text_add(tvb, tree);
/* Report this packet to the tap */
if (!pinfo->in_error_pkt)
{
tap_queue_packet(sip_tap, pinfo, stat_info);
}
return TRUE;
}
/* Display filter for SIP Request-Line */
static void
dfilter_sip_request_line(tvbuff_t *tvb, proto_tree *tree, guint meth_len)
{
char *string;
/*
* We know we have the entire method; otherwise, "sip_parse_line()"
* would have returned OTHER_LINE.
*/
string = tvb_get_ephemeral_string(tvb, 0, meth_len);
if (tree) {
proto_tree_add_string(tree, hf_Method, tvb, 0, meth_len, string);
}
/* Copy request method for telling tap */
stat_info->request_method = string;
}
/* Display filter for SIP Status-Line */
static void
dfilter_sip_status_line(tvbuff_t *tvb, proto_tree *tree)
{
char string[3+1];
gint response_code = 0;
/*
* We know we have the entire status code; otherwise,
* "sip_parse_line()" would have returned OTHER_LINE.
* We also know that we have a version string followed by a
* space at the beginning of the line, for the same reason.
*/
tvb_memcpy(tvb, (guint8 *)string, SIP2_HDR_LEN + 1, 3);
string[3] = '\0';
response_code = atoi(string);
/* Add numerical response code to tree */
if (tree) {
proto_tree_add_uint(tree, hf_Status_Code, tvb, SIP2_HDR_LEN + 1,
3, response_code);
}
/* Add response code for sending to tap */
stat_info->response_code = response_code;
}
void dfilter_store_sip_from_addr(tvbuff_t *tvb,proto_tree *tree,guint parameter_offset,
guint parameter_len)
{
proto_tree_add_item(tree, hf_sip_from_addr, tvb, parameter_offset,
parameter_len, FALSE);
}
/* From section 4.1 of RFC 2543:
*
* Request-Line = Method SP Request-URI SP SIP-Version CRLF
*
* From section 5.1 of RFC 2543:
*
* Status-Line = SIP-version SP Status-Code SP Reason-Phrase CRLF
*
* From section 7.1 of RFC 3261:
*
* Unlike HTTP, SIP treats the version number as a literal string.
* In practice, this should make no difference.
*/
static line_type_t
sip_parse_line(tvbuff_t *tvb, gint linelen, guint *token_1_lenp)
{
gint space_offset;
guint token_1_len;
gint token_2_start;
guint token_2_len;
gint token_3_start;
guint token_3_len;
gint colon_pos;
space_offset = tvb_find_guint8(tvb, 0, -1, ' ');
if (space_offset <= 0) {
/*
* Either there's no space in the line (which means
* the line is empty or doesn't have a token followed
* by a space; neither is valid for a request or status), or
* the first character in the line is a space (meaning
* the method is empty, which isn't valid for a request,
* or the SIP version is empty, which isn't valid for a
* status).
*/
return OTHER_LINE;
}
token_1_len = space_offset;
token_2_start = space_offset + 1;
space_offset = tvb_find_guint8(tvb, token_2_start, -1, ' ');
if (space_offset == -1) {
/*
* There's no space after the second token, so we don't
* have a third token.
*/
return OTHER_LINE;
}
token_2_len = space_offset - token_2_start;
token_3_start = space_offset + 1;
token_3_len = linelen - token_3_start;
*token_1_lenp = token_1_len;
/*
* Is the first token a version string?
*/
if ( (strict_sip_version && (
token_1_len == SIP2_HDR_LEN
&& tvb_strneql(tvb, 0, SIP2_HDR, SIP2_HDR_LEN) == 0)
) || (! strict_sip_version && (
tvb_strneql(tvb, 0, "SIP/", 4) == 0)
)) {
/*
* Yes, so this is either a Status-Line or something
* else other than a Request-Line. To be a Status-Line,
* the second token must be a 3-digit number.
*/
if (token_2_len != 3) {
/*
* We don't have 3-character status code.
*/
return OTHER_LINE;
}
if (!isdigit(tvb_get_guint8(tvb, token_2_start)) ||
!isdigit(tvb_get_guint8(tvb, token_2_start + 1)) ||
!isdigit(tvb_get_guint8(tvb, token_2_start + 2))) {
/*
* 3 characters yes, 3 digits no.
*/
return OTHER_LINE;
}
return STATUS_LINE;
} else {
/*
* No, so this is either a Request-Line or something
* other than a Status-Line. To be a Request-Line, the
* second token must be a URI and the third token must
* be a version string.
*/
if (token_2_len < 3) {
/*
* We don't have a URI consisting of at least 3
* characters.
*/
return OTHER_LINE;
}
colon_pos = tvb_find_guint8(tvb, token_2_start + 1, -1, ':');
if (colon_pos == -1) {
/*
* There is no colon after the method, so the URI
* doesn't have a colon in it, so it's not valid.
*/
return OTHER_LINE;
}
if (colon_pos >= token_3_start) {
/*
* The colon is in the version string, not the URI.
*/
return OTHER_LINE;
}
/* XXX - Check for a proper URI prefix? */
if ( (strict_sip_version && (
token_3_len != SIP2_HDR_LEN
|| tvb_strneql(tvb, token_3_start, SIP2_HDR, SIP2_HDR_LEN) == -1)
) || (! strict_sip_version && (
tvb_strneql(tvb, token_3_start, "SIP/", 4) == -1)
)) {
/*
* The version string isn't an SIP version 2.0 version
* string.
*/
return OTHER_LINE;
}
return REQUEST_LINE;
}
}
static gboolean sip_is_known_request(tvbuff_t *tvb, int meth_offset,
guint meth_len, guint *meth_idx)
{
guint i;
for (i = 1; i < array_length(sip_methods); i++) {
if (meth_len == strlen(sip_methods[i]) &&
tvb_strneql(tvb, meth_offset, sip_methods[i], meth_len) == 0)
{
*meth_idx = i;
return TRUE;
}
}
return FALSE;
}
/* Returns index of method in sip_headers */
static gint sip_is_known_sip_header(tvbuff_t *tvb, int offset, guint header_len)
{
guint i;
for (i = 1; i < array_length(sip_headers); i++) {
if (header_len == strlen(sip_headers[i].name) &&
tvb_strncaseeql(tvb, offset, sip_headers[i].name, header_len) == 0)
return i;
if (sip_headers[i].compact_name != NULL &&
header_len == strlen(sip_headers[i].compact_name) &&
tvb_strncaseeql(tvb, offset, sip_headers[i].compact_name, header_len) == 0)
return i;
}
return -1;
}
/*
* Display the entire message as raw text.
*/
static void
tvb_raw_text_add(tvbuff_t *tvb, proto_tree *tree)
{
proto_tree *raw_tree = NULL;
proto_item *ti = NULL;
int offset, next_offset, linelen;
if(tree) {
ti = proto_tree_add_item(tree, proto_raw_sip, tvb, 0, -1, FALSE);
raw_tree = proto_item_add_subtree(ti, ett_raw_text);
}
offset = 0;
while (tvb_offset_exists(tvb, offset)) {
tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
linelen = next_offset - offset;
if(raw_tree) {
proto_tree_add_text(raw_tree, tvb, offset, linelen,
"%s", tvb_format_text(tvb, offset, linelen));
}
offset = next_offset;
}
}
/* Check to see if this packet is a resent request. Return value is number
of the original frame this packet seems to be resending (0 = no resend). */
guint sip_is_packet_resend(packet_info *pinfo,
gchar *cseq_method,
gchar *call_id,
guchar cseq_number_set,
guint32 cseq_number, line_type_t line_type)
{
guint32 cseq_to_compare = 0;
sip_hash_key key;
sip_hash_key *p_key = 0;
sip_hash_value *p_val = 0;
guint result = 0;
/* Only consider retransmission of UDP packets */
if (pinfo->ptype != PT_UDP)
{
return 0;
}
/* Don't consider packets that appear to be resent only because
they are e.g. returned in ICMP unreachable messages. */
if (pinfo->in_error_pkt)
{
return 0;
}
/* A broken packet may have no cseq number set. Don't consider it as
a resend */
if (!cseq_number_set)
{
return 0;
}
/* Return any answer stored from previous dissection */
if (pinfo->fd->flags.visited)
{
return GPOINTER_TO_UINT(p_get_proto_data(pinfo->fd, proto_sip));
}
/* No packet entry found, consult global hash table */
/* Prepare the key */
strncpy(key.call_id, call_id,
(strlen(call_id)+1 <= MAX_CALL_ID_SIZE) ?
strlen(call_id)+1 :
MAX_CALL_ID_SIZE);
COPY_ADDRESS(&key.dest_address, &pinfo->net_dst);
COPY_ADDRESS(&key.source_address, &pinfo->net_src);
key.dest_port = pinfo->destport;
key.source_port = pinfo->srcport;
/* Do the lookup */
p_val = (sip_hash_value*)g_hash_table_lookup(sip_hash, &key);
if (p_val)
{
/* Table entry found, we'll use its value for comparison */
cseq_to_compare = p_val->cseq;
}
else
{
/* Need to create a new table entry */
/* Allocate a new key and value */
p_key = se_alloc(sizeof(sip_hash_key));
p_val = se_alloc(sizeof(sip_hash_value));
/* Just give up if allocations failed */
if (!p_key || !p_val)
{
return 0;
}
/* Fill in key and value details */
strcpy(p_key->call_id, call_id);
COPY_ADDRESS(&(p_key->dest_address), &pinfo->net_dst);
COPY_ADDRESS(&(p_key->source_address), &pinfo->net_src);
p_key->dest_port = pinfo->destport;
p_key->source_port = pinfo->srcport;
p_val->cseq = cseq_number;
p_val->transaction_state = nothing_seen;
p_val->frame_number = 0;
/* Add entry */
g_hash_table_insert(sip_hash, p_key, p_val);
/* Assume have seen no cseq yet */
cseq_to_compare = 0;
}
/******************************************/
/* Is it a resend??? */
/* Does this look like a resent request (discount ACK, CANCEL) ? */
if ((line_type == REQUEST_LINE) && (cseq_number == cseq_to_compare) &&
(p_val->transaction_state == request_seen) &&
(strcmp(cseq_method, "ACK") != 0) &&
(strcmp(cseq_method, "CANCEL") != 0))
{
result = p_val->frame_number;
}
/* Does this look like a resent final response ? */
if ((line_type == STATUS_LINE) && (cseq_number == cseq_to_compare) &&
(p_val->transaction_state == final_response_seen) &&
(stat_info->response_code >= 200) &&
(stat_info->response_code == p_val->response_code))
{
result = p_val->frame_number;
}
/* Update state for this entry */
p_val->cseq = cseq_number;
switch (line_type)
{
case REQUEST_LINE:
p_val->transaction_state = request_seen;
if (!result)
{
p_val->frame_number = pinfo->fd->num;
}
break;
case STATUS_LINE:
if (stat_info->response_code >= 200)
{
p_val->response_code = stat_info->response_code;
p_val->transaction_state = final_response_seen;
if (!result)
{
p_val->frame_number = pinfo->fd->num;
}
}
else
{
p_val->transaction_state = provisional_response_seen;
}
break;
default:
break;
}
/* Store return value with this packet */
p_add_proto_data(pinfo->fd, proto_sip, GUINT_TO_POINTER(result));
return result;
}
/* Register the protocol with Ethereal */
void proto_register_sip(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_msg_hdr,
{ "Message Header", "sip.msg_hdr",
FT_NONE, 0, NULL, 0,
"Message Header in SIP message", HFILL }
},
{ &hf_Method,
{ "Method", "sip.Method",
FT_STRING, BASE_NONE,NULL,0x0,
"SIP Method", HFILL }
},
{ &hf_Request_Line,
{ "Request-Line", "sip.Request-Line",
FT_STRING, BASE_NONE,NULL,0x0,
"SIP Request-Line", HFILL }
},
{ &hf_Status_Code,
{ "Status-Code", "sip.Status-Code",
FT_UINT32, BASE_DEC,NULL,0x0,
"SIP Status Code", HFILL }
},
{ &hf_Status_Line,
{ "Status-Line", "sip.Status-Line",
FT_STRING, BASE_NONE,NULL,0x0,
"SIP Status-Line", HFILL }
},
{ &hf_sip_display,
{ "SIP Display info", "sip.display.info",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Display info", HFILL }
},
{ &hf_sip_to_addr,
{ "SIP to address", "sip.to.addr",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: to addr", HFILL }
},
{ &hf_sip_from_addr,
{ "SIP from address", "sip.from.addr",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: from addr", HFILL }
},
{ &hf_sip_contact_addr,
{ "SIP contact address", "sip.contact.addr",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: contact addr", HFILL }
},
{ &hf_sip_uri,
{ "URI", "sip.uri",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: SIP Uri", HFILL }
},
{ &hf_sip_contact_item,
{ "Contact Binding", "sip.contact.binding",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: one contact binding", HFILL }
},
{ &hf_sip_tag,
{ "SIP tag", "sip.tag",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: tag", HFILL }
},
{ &hf_header_array[POS_ACCEPT],
{ "Accept", "sip.Accept",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Accept Header", HFILL }
},
{ &hf_header_array[POS_ACCEPT_CONTACT],
{ "Accept-Contact", "sip.Accept-Contact",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3841: Accept-Contact Header", HFILL }
},
{ &hf_header_array[POS_ACCEPT_ENCODING],
{ "Accept-Encoding", "sip.Accept-Encoding",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3841: Accept-Encoding Header", HFILL }
},
{ &hf_header_array[POS_ACCEPT_LANGUAGE],
{ "Accept-Language", "sip.Accept-Language",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Accept-Language Header", HFILL }
},
{ &hf_header_array[POS_ACCEPT_RESOURCE_PRIORITY],
{ "Accept-Resource-Priority", "sip.Accept-Resource-Priority",
FT_STRING, BASE_NONE,NULL,0x0,
"Draft: Accept-Resource-Priority Header", HFILL }
},
{ &hf_header_array[POS_ALERT_INFO],
{ "Alert-Info", "sip.Alert-Info",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Alert-Info Header", HFILL }
},
{ &hf_header_array[POS_ALLOW],
{ "Allow", "sip.Allow",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Allow Header", HFILL }
},
{ &hf_header_array[POS_ALLOW_EVENTS],
{ "Allow-Events", "sip.Allow-Events",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3265: Allow-Events Header", HFILL }
},
{ &hf_header_array[POS_AUTHENTICATION_INFO],
{ "Authentication-Info", "sip.Authentication-Info",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Authentication-Info Header", HFILL }
},
{ &hf_header_array[POS_AUTHORIZATION],
{ "Authorization", "sip.Authorization",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Authorization Header", HFILL }
},
{ &hf_header_array[POS_CALL_ID],
{ "Call-ID", "sip.Call-ID",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Call-ID Header", HFILL }
},
{ &hf_header_array[POS_CALL_INFO],
{ "Call-Info", "sip.Call-Info",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Call-Info Header", HFILL }
},
{ &hf_header_array[POS_CONTACT],
{ "Contact", "sip.Contact",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Contact Header", HFILL }
},
{ &hf_header_array[POS_CONTENT_DISPOSITION],
{ "Content-Disposition", "sip.Content-Disposition",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Content-Disposition Header", HFILL }
},
{ &hf_header_array[POS_CONTENT_ENCODING],
{ "Content-Encoding", "sip.Content-Encoding",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Content-Encoding Header", HFILL }
},
{ &hf_header_array[POS_CONTENT_LANGUAGE],
{ "Content-Language", "sip.Content-Language",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Content-Language Header", HFILL }
},
{ &hf_header_array[POS_CONTENT_LENGTH],
{ "Content-Length", "sip.Content-Length",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Content-Length Header", HFILL }
},
{ &hf_header_array[POS_CONTENT_TYPE],
{ "Content-Type", "sip.Content-Type",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Content-Type Header", HFILL }
},
{ &hf_header_array[POS_CSEQ],
{ "CSeq", "sip.CSeq",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: CSeq Header", HFILL }
},
{ &hf_header_array[POS_DATE],
{ "Date", "sip.Date",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Date Header", HFILL }
},
{ &hf_header_array[POS_ERROR_INFO],
{ "Error-Info", "sip.Error-Info",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Error-Info Header", HFILL }
},
{ &hf_header_array[POS_EVENT],
{ "Event", "sip.Event",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3265: Event Header", HFILL }
},
{ &hf_header_array[POS_EXPIRES],
{ "Expires", "sip.Expires",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Expires Header", HFILL }
},
{ &hf_header_array[POS_FROM],
{ "From", "sip.From",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: From Header", HFILL }
},
{ &hf_header_array[POS_IN_REPLY_TO],
{ "In-Reply-To", "sip.In-Reply-To",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: In-Reply-To Header", HFILL }
},
{ &hf_header_array[POS_JOIN],
{ "Join", "sip.Join",
FT_STRING, BASE_NONE,NULL,0x0,
"Draft: Join Header", HFILL }
},
{ &hf_header_array[POS_MAX_FORWARDS],
{ "Max-Forwards", "sip.Max-Forwards",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Max-Forwards Header", HFILL }
},
{ &hf_header_array[POS_MIME_VERSION],
{ "MIME-Version", "sip.MIME-Version",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: MIME-Version Header", HFILL }
},
{ &hf_header_array[POS_MIN_EXPIRES],
{ "Min-Expires", "sip.Min-Expires",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Min-Expires Header", HFILL }
},
{ &hf_header_array[POS_MIN_SE],
{ "Min-SE", "sip.Min-SE",
FT_STRING, BASE_NONE,NULL,0x0,
"Draft: Min-SE Header", HFILL }
},
{ &hf_header_array[POS_ORGANIZATION],
{ "Organization", "sip.Organization",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Organization Header", HFILL }
},
{ &hf_header_array[POS_P_ACCESS_NETWORK_INFO],
{ "P-Access-Network-Info", "sip.P-Access-Network-Info",
FT_STRING, BASE_NONE,NULL,0x0,
"P-Access-Network-Info Header", HFILL }
},
{ &hf_header_array[POS_P_ASSERTED_IDENTITY],
{ "P-Asserted-Identity", "sip.P-Asserted-Identity",
FT_STRING, BASE_NONE,NULL,0x0,
"P-Asserted-Identity Header", HFILL }
},
{ &hf_header_array[POS_P_ASSOCIATED_URI],
{ "P-Associated-URI", "sip.P-Associated-URI",
FT_STRING, BASE_NONE,NULL,0x0,
"P-Associated-URI Header", HFILL }
},
{ &hf_header_array[POS_P_CALLED_PARTY_ID],
{ "P-Called-Party-ID", "sip.P-Called-Party-ID",
FT_STRING, BASE_NONE,NULL,0x0,
"P-Called-Party-ID Header", HFILL }
},
{ &hf_header_array[POS_P_CHARGING_FUNCTION_ADDRESSES],
{ "P-Charging-Function-Addresses","sip.P-Charging-Function-Addresses",
FT_STRING, BASE_NONE,NULL,0x0,
"P-Charging-Function-Addresses", HFILL }
},
{ &hf_header_array[POS_P_CHARGING_VECTOR],
{ "P-Charging-Vector", "sip.P-Charging-Vector",
FT_STRING, BASE_NONE,NULL,0x0,
"P-Charging-Vector Header", HFILL }
},
{ &hf_header_array[POS_P_DCS_TRACE_PARTY_ID],
{ "P-DCS-Trace-Party-ID", "sip.P-DCS-Trace-Party-ID",
FT_STRING, BASE_NONE,NULL,0x0,
"P-DCS-Trace-Party-ID Header", HFILL }
},
{ &hf_header_array[POS_P_DCS_OSPS],
{ "P-DCS-OSPS", "sip.P-DCS-OSPS",
FT_STRING, BASE_NONE,NULL,0x0,
"P-DCS-OSPS Header", HFILL }
},
{ &hf_header_array[POS_P_DCS_BILLING_INFO],
{ "P-DCS-Billing-Info", "sip.P-DCS-Billing-Info",
FT_STRING, BASE_NONE,NULL,0x0,
"P-DCS-Billing-Info Header", HFILL }
},
{ &hf_header_array[POS_P_DCS_LAES],
{ "P-DCS-LAES", "sip.P-DCS-LAES",
FT_STRING, BASE_NONE,NULL,0x0,
"P-DCS-LAES Header", HFILL }
},
{ &hf_header_array[POS_P_DCS_REDIRECT],
{ "P-DCS-Redirect", "sip.P-DCS-Redirect",
FT_STRING, BASE_NONE,NULL,0x0,
"P-DCS-Redirect Header", HFILL }
},
{ &hf_header_array[POS_P_MEDIA_AUTHORIZATION],
{ "P-Media-Authorization", "sip.P-Media-Authorization",
FT_STRING, BASE_NONE,NULL,0x0,
"P-Media-Authorization Header", HFILL }
},
{ &hf_header_array[POS_P_PREFERRED_IDENTITY],
{ "P-Preferred-Identity", "sip.P-Preferred-Identity",
FT_STRING, BASE_NONE,NULL,0x0,
"P-Preferred-Identity Header", HFILL }
},
{ &hf_header_array[POS_P_VISITED_NETWORK_ID],
{ "P-Visited-Network-ID", "sip.P-Visited-Network-ID",
FT_STRING, BASE_NONE,NULL,0x0,
"P-Visited-Network-ID Header", HFILL }
},
{ &hf_header_array[POS_PATH],
{ "Path", "sip.Path",
FT_STRING, BASE_NONE,NULL,0x0,
"Path Header", HFILL }
},
{ &hf_header_array[POS_PRIORITY],
{ "Priority", "sip.Priority",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Priority Header", HFILL }
},
{ &hf_header_array[POS_PRIVACY],
{ "Privacy", "sip.Privacy",
FT_STRING, BASE_NONE,NULL,0x0,
"Privacy Header", HFILL }
},
{ &hf_header_array[POS_PROXY_AUTHENTICATE],
{ "Proxy-Authenticate", "sip.Proxy-Authenticate",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Proxy-Authenticate Header", HFILL }
},
{ &hf_header_array[POS_PROXY_AUTHORIZATION],
{ "Proxy-Authorization", "sip.Proxy-Authorization",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Proxy-Authorization Header", HFILL }
},
{ &hf_header_array[POS_PROXY_REQUIRE],
{ "Proxy-Require", "sip.Proxy-Require",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Proxy-Require Header", HFILL }
},
{ &hf_header_array[POS_RACK],
{ "RAck", "sip.RAck",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3262: RAck Header", HFILL }
},
{ &hf_header_array[POS_REASON],
{ "Reason", "sip.Reason",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3326 Reason Header", HFILL }
},
{ &hf_header_array[POS_RECORD_ROUTE],
{ "Record-Route", "sip.Record-Route",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Record-Route Header", HFILL }
},
{ &hf_header_array[POS_REFERED_BY],
{ "Refered By", "sip.Refered-by",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3892: Refered-by Header", HFILL }
},
{ &hf_header_array[POS_REJECT_CONTACT],
{ "Reject-Contact", "sip.Reject-Contact",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3841: Reject-Contact Header", HFILL }
},
{ &hf_header_array[POS_REPLACES],
{ "Replaces", "sip.Replaces",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3891: Replaces Header", HFILL }
},
{ &hf_header_array[POS_REPLY_TO],
{ "Reply-To", "sip.Reply-To",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Reply-To Header", HFILL }
},
{ &hf_header_array[POS_REQUEST_DISPOSITION],
{ "Request-Disposition", "sip.Request-Disposition",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3841: Request-Disposition Header", HFILL }
},
{ &hf_header_array[POS_REQUIRE],
{ "Require", "sip.Require",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Require Header", HFILL }
},
{ &hf_header_array[POS_RESOURCE_PRIORITY],
{ "Resource-Priority", "sip.Resource-Priority",
FT_STRING, BASE_NONE,NULL,0x0,
"Draft: Resource-Priority Header", HFILL }
},
{ &hf_header_array[POS_RETRY_AFTER],
{ "Retry-After", "sip.Retry-After",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Retry-After Header", HFILL }
},
{ &hf_header_array[POS_ROUTE],
{ "Route", "sip.Route",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Route Header", HFILL }
},
{ &hf_header_array[POS_RSEQ],
{ "RSeq", "sip.RSeq",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3262: RSeq Header", HFILL }
},
{ &hf_header_array[ POS_SECURITY_CLIENT],
{ "Security-Client", "sip.Security-Client",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3329 Security-Client Header", HFILL }
},
{ &hf_header_array[ POS_SECURITY_SERVER],
{ "Security-Server", "sip.Security-Server",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3329 Security-Server Header", HFILL }
},
{ &hf_header_array[ POS_SECURITY_VERIFY],
{ "Security-Verify", "sip.Security-Verify",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3329 Security-Verify Header", HFILL }
},
{ &hf_header_array[POS_SERVER],
{ "Server", "sip.Server",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Server Header", HFILL }
},
{ &hf_header_array[POS_SERVICE_ROUTE],
{ "Service-Route", "sip.Service-Route",
FT_STRING, BASE_NONE,NULL,0x0,
"Service-Route Header", HFILL }
},
{ &hf_header_array[POS_SESSION_EXPIRES],
{ "Session-Expires", "sip.Session-Expires",
FT_STRING, BASE_NONE,NULL,0x0,
"Session-Expires Header", HFILL }
},
{ &hf_header_array[POS_SIP_ETAG],
{ "ETag", "sip.ETag",
FT_STRING, BASE_NONE,NULL,0x0,
"SIP-ETag Header", HFILL }
},
{ &hf_header_array[POS_SIP_IF_MATCH],
{ "If_Match", "sip.If_Match",
FT_STRING, BASE_NONE,NULL,0x0,
"SIP-If-Match Header", HFILL }
},
{ &hf_header_array[POS_SUBJECT],
{ "Subject", "sip.Subject",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Subject Header", HFILL }
},
{ &hf_header_array[POS_SUBSCRIPTION_STATE],
{ "Subscription-State", "sip.Subscription-State",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3265: Subscription-State Header", HFILL }
},
{ &hf_header_array[POS_SUPPORTED],
{ "Supported", "sip.Supported",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Supported Header", HFILL }
},
{ &hf_header_array[POS_TIMESTAMP],
{ "Timestamp", "sip.Timestamp",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Timestamp Header", HFILL }
},
{ &hf_header_array[POS_TO],
{ "To", "sip.To",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: To Header", HFILL }
},
{ &hf_header_array[POS_UNSUPPORTED],
{ "Unsupported", "sip.Unsupported",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Unsupported Header", HFILL }
},
{ &hf_header_array[POS_USER_AGENT],
{ "User-Agent", "sip.User-Agent",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: User-Agent Header", HFILL }
},
{ &hf_header_array[POS_VIA],
{ "Via", "sip.Via",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Via Header", HFILL }
},
{ &hf_header_array[POS_WARNING],
{ "Warning", "sip.Warning",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: Warning Header", HFILL }
},
{ &hf_header_array[POS_WWW_AUTHENTICATE],
{ "WWW-Authenticate", "sip.WWW-Authenticate",
FT_STRING, BASE_NONE,NULL,0x0,
"RFC 3261: WWW-Authenticate Header", HFILL }
},
{ &hf_header_array[POS_REFER_TO],
{ "Refer-To", "sip.Refer-To",
FT_STRING, BASE_NONE,NULL,0x0,
"Refer-To Header", HFILL }
},
{ &hf_sip_resend,
{ "Resent Packet", "sip.resend",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"", HFILL }
},
{ &hf_sip_original_frame,
{ "Suspected resend of frame", "sip.resend-original",
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
"Original transmission of frame", HFILL}}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_sip,
&ett_sip_reqresp,
&ett_sip_hdr,
&ett_sip_element,
&ett_sip_uri,
&ett_sip_contact_item,
&ett_sip_message_body,
};
static gint *ett_raw[] = {
&ett_raw_text,
};
module_t *sip_module;
/* Register the protocol name and description */
proto_sip = proto_register_protocol("Session Initiation Protocol",
"SIP", "sip");
proto_raw_sip = proto_register_protocol("Session Initiation Protocol (SIP as raw text)",
"Raw_SIP", "raw_sip");
new_register_dissector("sip", dissect_sip, proto_sip);
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_sip, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
proto_register_subtree_array(ett_raw, array_length(ett_raw));
/* SIP content type and internet media type used by other dissectors are the same */
media_type_dissector_table = find_dissector_table("media_type");
sip_module = prefs_register_protocol(proto_sip, NULL);
prefs_register_bool_preference(sip_module, "display_raw_text",
"Display raw text for SIP message",
"Specifies that the raw text of the "
"SIP message should be displayed "
"in addition to the dissection tree",
&global_sip_raw_text);
prefs_register_bool_preference(sip_module, "strict_sip_version",
"Enforce strict SIP version check (" SIP2_HDR ")",
"If enabled, only " SIP2_HDR " traffic will be dissected as SIP. "
"Disable it to allow SIP traffic with a different version "
"to be dissected as SIP.",
&strict_sip_version);
register_init_routine(&sip_init_protocol);
/* Register for tapping */
sip_tap = register_tap("sip");
}
void
proto_reg_handoff_sip(void)
{
dissector_handle_t sip_handle, sip_tcp_handle;
sip_handle = new_create_dissector_handle(dissect_sip, proto_sip);
dissector_add("udp.port", UDP_PORT_SIP, sip_handle);
dissector_add_string("media_type", "message/sip", sip_handle);
sigcomp_handle = find_dissector("sigcomp");
sip_tcp_handle = create_dissector_handle(dissect_sip_tcp, proto_sip);
dissector_add("tcp.port", TCP_PORT_SIP, sip_tcp_handle);
heur_dissector_add("udp", dissect_sip_heur, proto_sip);
heur_dissector_add("tcp", dissect_sip_heur, proto_sip);
heur_dissector_add("sctp", dissect_sip_heur, proto_sip);
}
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