SIP reassembly using req_resp_hdrs_do_reassembly()
svn path=/trunk/; revision=15709
This commit is contained in:
Tomas Kukosa
parent
00aa0f43b8
commit
cd88fb82d8
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@ -55,6 +55,7 @@
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/req_resp_hdrs.h>
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#include <epan/emem.h>
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#include "packet-sip.h"
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@ -405,10 +406,21 @@ static gboolean global_sip_raw_text = FALSE;
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/* strict_sip_version determines whether the SIP dissector enforces
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* the SIP version to be "SIP/2.0". */
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static gboolean strict_sip_version = TRUE;
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static gboolean sip_desegment = FALSE;
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static gboolean dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree, gboolean is_heur);
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/*
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* desegmentation of SIP headers
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* (when we are over TCP or another protocol providing the desegmentation API)
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*/
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static gboolean sip_desegment_headers = FALSE;
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/*
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* desegmentation of SIP bodies
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* (when we are over TCP or another protocol providing the desegmentation API)
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*/
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static gboolean sip_desegment_body = FALSE;
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static gboolean dissect_sip_common(tvbuff_t *tvb, int offset, packet_info *pinfo,
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proto_tree *tree, gboolean is_heur, gboolean use_reassembly);
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static line_type_t sip_parse_line(tvbuff_t *tvb, int offset, gint linelen,
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guint *token_1_len);
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static gboolean sip_is_known_request(tvbuff_t *tvb, int meth_offset,
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@ -418,7 +430,7 @@ static gint sip_is_known_sip_header(tvbuff_t *tvb, int offset,
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static void dfilter_sip_request_line(tvbuff_t *tvb, proto_tree *tree,
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guint meth_len);
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static void dfilter_sip_status_line(tvbuff_t *tvb, proto_tree *tree);
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static void tvb_raw_text_add(tvbuff_t *tvb, proto_tree *tree);
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static void tvb_raw_text_add(tvbuff_t *tvb, int offset, int length, proto_tree *tree);
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static guint sip_is_packet_resend(packet_info *pinfo,
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gchar* cseq_method,
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gchar* call_id,
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@ -944,107 +956,43 @@ dissect_sip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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}
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if (!dissect_sip_common(tvb, pinfo, tree, FALSE))
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return 0;
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return tvb_length(tvb);
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}
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static guint
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get_sip_pdu_len(tvbuff_t *tvb, int begin_offset) {
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int offset;
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gint next_offset, linelen, content_length;
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line_type_t line_type;
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guint tvb_len, token_1_len;
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tvb_len = tvb_length_remaining(tvb, begin_offset);
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offset = begin_offset;
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linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
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line_type = sip_parse_line(tvb, offset, linelen, &token_1_len);
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if (line_type == OTHER_LINE) return tvb_len;
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offset = next_offset;
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content_length = -1;
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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gint line_end_offset;
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gint colon_offset;
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gint hf_index;
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gint value_offset;
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guchar c;
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char *value;
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linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, TRUE);
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if (linelen == -1) {
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/* end of the line has not been found, request more bytes */
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return tvb_len + 2;
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}
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if (linelen == 0) {
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/*
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* This is a blank line separating the
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* message header from the message body.
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*/
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if (content_length >= 0)
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return next_offset - begin_offset + content_length;
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else
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return tvb_len;
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}
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line_end_offset = offset + linelen;
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colon_offset = tvb_find_guint8(tvb, offset, linelen, ':');
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if (colon_offset == -1) return tvb_len;
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hf_index = sip_is_known_sip_header(tvb, offset, colon_offset - offset);
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if (hf_index == POS_CONTENT_LENGTH) {
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/* Skip whitespace after the colon. */
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value_offset = colon_offset + 1;
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while (value_offset < line_end_offset &&
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((c = tvb_get_guint8(tvb, value_offset)) == ' ' || c == '\t'))
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value_offset++;
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/* Fetch the value. */
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value = (char*)tvb_get_ephemeral_string(tvb, value_offset, line_end_offset - value_offset);
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content_length = atoi(value);
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}
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offset = next_offset;
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}
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return tvb_len + 2; /* end of the message header has not been found, request more bytes */
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}
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static void
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dissect_sip_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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dissect_sip_common(tvb, pinfo, tree, TRUE);
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return dissect_sip_common(tvb, 0, pinfo, tree, FALSE, FALSE);
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}
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static void
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dissect_sip_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint8 octet;
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int offset = 0;
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int len;
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octet = tvb_get_guint8(tvb,0);
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if ((octet & 0xf8) == 0xf8){
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call_dissector(sigcomp_handle, tvb, pinfo, tree);
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return;
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}
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if (sip_desegment) {
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tcp_dissect_pdus(tvb, pinfo, tree,
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sip_desegment, /* desegment or not */
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36, /* fixed-length part of the PDU */
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get_sip_pdu_len, /* routine to get the length of the PDU */
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dissect_sip_pdu); /* routine to dissect a PDU */
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} else {
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dissect_sip_common(tvb, pinfo, tree, TRUE);
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while (tvb_reported_length_remaining(tvb, offset) != 0) {
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len = dissect_sip_common(tvb, offset, pinfo, tree, TRUE, TRUE);
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if (len == -1)
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break;
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offset += len;
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}
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}
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static gboolean
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dissect_sip_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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return dissect_sip_common(tvb, pinfo, tree, FALSE);
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return dissect_sip_common(tvb, 0, pinfo, tree, FALSE, FALSE) > 0;
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}
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static gboolean
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dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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gboolean dissect_other_as_continuation)
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static int
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dissect_sip_common(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree,
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gboolean dissect_other_as_continuation, gboolean use_reassembly)
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{
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int offset;
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int orig_offset;
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gint next_offset, linelen;
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int content_length, datalen, reported_datalen;
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line_type_t line_type;
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tvbuff_t *next_tvb;
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gboolean is_known_request;
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@ -1083,9 +1031,9 @@ dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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* Note that "tvb_strneql()" doesn't throw exceptions, so
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* "sip_parse_line()" won't throw an exception.
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*/
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offset = 0;
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linelen = tvb_find_line_end(tvb, 0, -1, &next_offset, FALSE);
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line_type = sip_parse_line(tvb, 0, linelen, &token_1_len);
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orig_offset = offset;
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linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
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line_type = sip_parse_line(tvb, offset, linelen, &token_1_len);
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if (line_type == OTHER_LINE) {
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/*
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* This is neither a SIP request nor response.
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@ -1094,12 +1042,26 @@ dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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/*
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* We were asked to reject this.
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*/
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return FALSE;
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return -1;
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}
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/*
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* Just dissect it as a continuation.
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*/
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} else if (use_reassembly) {
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/*
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* Yes, it's a request or response.
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* Do header desegmentation if we've been told to,
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* and do body desegmentation if we've been told to and
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* we find a Content-Length header.
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*/
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if (!req_resp_hdrs_do_reassembly(tvb, offset, pinfo,
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sip_desegment_headers, sip_desegment_body)) {
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/*
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* More data needed for desegmentation.
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*/
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return -1;
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}
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}
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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@ -1108,12 +1070,12 @@ dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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switch (line_type) {
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case REQUEST_LINE:
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is_known_request = sip_is_known_request(tvb, 0, token_1_len, ¤t_method_idx);
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is_known_request = sip_is_known_request(tvb, offset, token_1_len, ¤t_method_idx);
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descr = is_known_request ? "Request" : "Unknown request";
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %s",
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descr,
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tvb_format_text(tvb, 0, linelen - SIP2_HDR_LEN - 1));
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tvb_format_text(tvb, offset, linelen - SIP2_HDR_LEN - 1));
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}
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break;
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@ -1121,9 +1083,9 @@ dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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descr = "Status";
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "Status: %s",
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tvb_format_text(tvb, SIP2_HDR_LEN + 1, linelen - SIP2_HDR_LEN - 1));
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tvb_format_text(tvb, offset + SIP2_HDR_LEN + 1, linelen - SIP2_HDR_LEN - 1));
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}
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stat_info->reason_phrase = tvb_get_ephemeral_string(tvb, SIP2_HDR_LEN + 5, linelen - (SIP2_HDR_LEN + 5));
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stat_info->reason_phrase = tvb_get_ephemeral_string(tvb, offset + SIP2_HDR_LEN + 5, linelen - (SIP2_HDR_LEN + 5));
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break;
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case OTHER_LINE:
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@ -1135,7 +1097,7 @@ dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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}
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if (tree) {
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ts = proto_tree_add_item(tree, proto_sip, tvb, 0, -1, FALSE);
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ts = proto_tree_add_item(tree, proto_sip, tvb, offset, -1, FALSE);
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sip_tree = proto_item_add_subtree(ts, ett_sip);
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}
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@ -1143,8 +1105,8 @@ dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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case REQUEST_LINE:
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if (sip_tree) {
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ti = proto_tree_add_string(sip_tree, hf_Request_Line, tvb, 0, linelen,
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tvb_format_text(tvb, 0, linelen));
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ti = proto_tree_add_string(sip_tree, hf_Request_Line, tvb, offset, linelen,
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tvb_format_text(tvb, offset, linelen));
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reqresp_tree = proto_item_add_subtree(ti, ett_sip_reqresp);
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}
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dfilter_sip_request_line(tvb, reqresp_tree, token_1_len);
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@ -1152,8 +1114,8 @@ dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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case STATUS_LINE:
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if (sip_tree) {
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ti = proto_tree_add_string(sip_tree, hf_Status_Line, tvb, 0, linelen,
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tvb_format_text(tvb, 0, linelen));
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ti = proto_tree_add_string(sip_tree, hf_Status_Line, tvb, offset, linelen,
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tvb_format_text(tvb, offset, linelen));
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reqresp_tree = proto_item_add_subtree(ti, ett_sip_reqresp);
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}
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dfilter_sip_status_line(tvb, reqresp_tree);
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@ -1161,14 +1123,14 @@ dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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case OTHER_LINE:
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if (sip_tree) {
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ti = proto_tree_add_text(sip_tree, tvb, 0, next_offset,
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ti = proto_tree_add_text(sip_tree, tvb, offset, next_offset,
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"%s line: %s", descr,
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tvb_format_text(tvb, 0, linelen));
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tvb_format_text(tvb, offset, linelen));
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reqresp_tree = proto_item_add_subtree(ti, ett_sip_reqresp);
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proto_tree_add_text(sip_tree, tvb, 0, -1,
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proto_tree_add_text(sip_tree, tvb, offset, -1,
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"Continuation data");
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}
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return TRUE;
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return tvb_length_remaining(tvb, offset);
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}
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offset = next_offset;
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@ -1183,6 +1145,7 @@ dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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* headers from the message body.
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*/
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next_offset = offset;
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content_length = -1;
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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gint line_end_offset;
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gint colon_offset;
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@ -1206,6 +1169,7 @@ dissect_sip_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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* This is a blank line separating the
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* message header from the message body.
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*/
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offset = next_offset;
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break;
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}
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line_end_offset = offset + linelen;
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@ -1489,7 +1453,7 @@ separator_found2:
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if (value_offset == (gint)strlen(value))
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{
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THROW(ReportedBoundsError);
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return TRUE;
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return offset - orig_offset;
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}
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/* Extract method name from value */
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@ -1505,7 +1469,7 @@ separator_found2:
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strlen_to_copy);
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}
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THROW(ReportedBoundsError);
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return TRUE;
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return offset - orig_offset;
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}
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else {
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strncpy(cseq_method, value+value_offset, MIN(strlen_to_copy, MAX_CSEQ_METHOD_SIZE));
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@ -1593,6 +1557,17 @@ separator_found2:
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#endif
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break;
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case POS_CONTENT_LENGTH :
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if(hdr_tree) {
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proto_tree_add_string_format(hdr_tree,
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hf_header_array[hf_index], tvb,
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offset, next_offset - offset,
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value, "%s",
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tvb_format_text(tvb, offset, linelen));
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}
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content_length = atoi(value);
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break;
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case POS_CONTACT :
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if(hdr_tree) {
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sip_element_item = proto_tree_add_string_format(hdr_tree,
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@ -1643,14 +1618,22 @@ separator_found2:
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offset = next_offset;
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}/* End while */
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if (tvb_offset_exists(tvb, next_offset)) {
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datalen = tvb_length_remaining(tvb, offset);
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reported_datalen = tvb_reported_length_remaining(tvb, offset);
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if (content_length != -1) {
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if (datalen > content_length)
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datalen = content_length;
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if (reported_datalen > content_length)
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reported_datalen = content_length;
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}
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if (datalen > 0) {
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/*
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* There's a message body starting at "next_offset".
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* There's a message body starting at "offset".
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* Set the length of the header item.
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*/
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proto_item_set_end(th, tvb, next_offset);
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next_tvb = tvb_new_subset(tvb, next_offset, -1, -1);
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proto_item_set_end(th, tvb, offset);
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next_tvb = tvb_new_subset(tvb, offset, datalen, reported_datalen);
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if(sip_tree) {
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ti = proto_tree_add_text(sip_tree, next_tvb, 0, -1,
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"Message body");
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@ -1671,17 +1654,18 @@ separator_found2:
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}
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if ( found_match != TRUE )
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{
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offset = 0;
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while (tvb_offset_exists(next_tvb, offset)) {
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tvb_find_line_end(next_tvb, offset, -1, &next_offset, FALSE);
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linelen = next_offset - offset;
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int tmp_offset = 0;
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while (tvb_offset_exists(next_tvb, tmp_offset)) {
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tvb_find_line_end(next_tvb, tmp_offset, -1, &next_offset, FALSE);
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linelen = next_offset - tmp_offset;
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if(message_body_tree) {
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proto_tree_add_text(message_body_tree, next_tvb, offset, linelen,
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"%s", tvb_format_text(next_tvb, offset, linelen));
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proto_tree_add_text(message_body_tree, next_tvb, tmp_offset, linelen,
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"%s", tvb_format_text(next_tvb, tmp_offset, linelen));
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}
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offset = next_offset;
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tmp_offset = next_offset;
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}/* end while */
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}
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offset += datalen;
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}
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@ -1720,20 +1704,23 @@ separator_found2:
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if (reqresp_tree)
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{
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proto_item *item;
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item = proto_tree_add_boolean(reqresp_tree, hf_sip_resend, tvb, 0, 0,
|
||||
item = proto_tree_add_boolean(reqresp_tree, hf_sip_resend, tvb, orig_offset, 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);
|
||||
tvb, orig_offset, 0, resend_for_packet);
|
||||
PROTO_ITEM_SET_GENERATED(item);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
if (ts != NULL)
|
||||
proto_item_set_len(ts, offset - orig_offset);
|
||||
|
||||
if (global_sip_raw_text)
|
||||
tvb_raw_text_add(tvb, tree);
|
||||
tvb_raw_text_add(tvb, orig_offset, offset - orig_offset, tree);
|
||||
|
||||
/* Report this packet to the tap */
|
||||
if (!pinfo->in_error_pkt)
|
||||
|
|
@ -1741,7 +1728,7 @@ separator_found2:
|
|||
tap_queue_packet(sip_tap, pinfo, stat_info);
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
return offset - orig_offset;
|
||||
}
|
||||
|
||||
/* Display filter for SIP Request-Line */
|
||||
|
|
@ -1964,20 +1951,20 @@ static gint sip_is_known_sip_header(tvbuff_t *tvb, int offset, guint header_len)
|
|||
* Display the entire message as raw text.
|
||||
*/
|
||||
static void
|
||||
tvb_raw_text_add(tvbuff_t *tvb, proto_tree *tree)
|
||||
tvb_raw_text_add(tvbuff_t *tvb, int offset, int length, proto_tree *tree)
|
||||
{
|
||||
proto_tree *raw_tree = NULL;
|
||||
proto_item *ti = NULL;
|
||||
int offset, next_offset, linelen;
|
||||
int next_offset, linelen, end_offset;
|
||||
|
||||
if(tree) {
|
||||
ti = proto_tree_add_item(tree, proto_raw_sip, tvb, 0, -1, FALSE);
|
||||
ti = proto_tree_add_item(tree, proto_raw_sip, tvb, offset, length, FALSE);
|
||||
raw_tree = proto_item_add_subtree(ti, ett_raw_text);
|
||||
}
|
||||
|
||||
offset = 0;
|
||||
end_offset = offset + length;
|
||||
|
||||
while (tvb_offset_exists(tvb, offset)) {
|
||||
while (offset < end_offset) {
|
||||
tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
|
||||
linelen = next_offset - offset;
|
||||
if(raw_tree) {
|
||||
|
|
@ -2697,10 +2684,22 @@ void proto_register_sip(void)
|
|||
"Disable it to allow SIP traffic with a different version "
|
||||
"to be dissected as SIP.",
|
||||
&strict_sip_version);
|
||||
prefs_register_bool_preference(sip_module, "desegment",
|
||||
"Desegment SIP messages",
|
||||
"Whether the SIP dissector should desegment all messages spanning multiple TCP segments",
|
||||
&sip_desegment);
|
||||
prefs_register_bool_preference(sip_module, "desegment_headers",
|
||||
"Reassemble SIP headers spanning multiple TCP segments",
|
||||
"Whether the SIP dissector should reassemble headers "
|
||||
"of a request spanning multiple TCP segments. "
|
||||
"To use this option, you must also enable "
|
||||
"\"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
|
||||
&sip_desegment_headers);
|
||||
prefs_register_bool_preference(sip_module, "desegment_body",
|
||||
"Reassemble SIP bodies spanning multiple TCP segments",
|
||||
"Whether the SIP dissector should use the "
|
||||
"\"Content-length:\" value, if present, to reassemble "
|
||||
"the body of a request spanning multiple TCP segments, "
|
||||
"and reassemble chunked data spanning multiple TCP segments. "
|
||||
"To use this option, you must also enable "
|
||||
"\"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
|
||||
&sip_desegment_body);
|
||||
|
||||
register_init_routine(&sip_init_protocol);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue