epan/dissectors/packet-sipfrag.c

   1 /* Routines for sipfrag packet disassembly (RFC 3420)
   2  *
   3  * Martin Mathieson
   4  * Based on packet-sdp.c
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * SPDX-License-Identifier: GPL-2.0-or-later
  11  */
  12
  13 #include "config.h"
  14
  15 #include <epan/packet.h>
  16
  17 /*
  18  * Doesn't do a detailed dissection of the lines of the message, just treat as text.
  19  */
  20
  21 void proto_register_sipfrag(void);
  22
  23 /* Initialize the protocol and registered fields. */
  24 static int proto_sipfrag;
  25 static int hf_sipfrag_line;
  26
  27 /* Protocol subtree. */
  28 static int ett_sipfrag;
  29
  30 void proto_reg_handoff_sipfrag(void);
  31
  32 static dissector_handle_t sipfrag_handle;
  33
  34 /* Main dissection function. */
  35 static int dissect_sipfrag(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  36 {
  37     proto_tree  *sipfrag_tree;
  38     proto_item  *ti;
  39     int         offset = 0;
  40     int         next_offset;
  41     int         linelen;
  42     char        *string;
  43     int         lines = 0;
  44
  45     /* Append this protocol name rather than replace. */
  46     col_append_str(pinfo->cinfo, COL_PROTOCOL, "/sipfrag");
  47
  48     /* Add mention of this protocol to info column */
  49     col_append_str(pinfo->cinfo, COL_INFO, ", with Sipfrag");
  50
  51     /* Create sipfrag tree. */
  52     ti = proto_tree_add_item(tree, proto_sipfrag, tvb, offset, -1, ENC_NA);
  53     sipfrag_tree = proto_item_add_subtree(ti, ett_sipfrag);
  54
  55     /* Show the sipfrag message a line at a time. */
  56     while (tvb_offset_exists(tvb, offset))
  57     {
  58         /* Find the end of the line. */
  59         linelen = tvb_find_line_end_unquoted(tvb, offset, -1, &next_offset);
  60
  61         /* For now, add all lines as unparsed strings */
  62
  63         /* Extract & add the string. */
  64         string = (char*)tvb_get_string_enc(pinfo->pool, tvb, offset, linelen, ENC_ASCII);
  65         proto_tree_add_string_format(sipfrag_tree, hf_sipfrag_line,
  66                                      tvb, offset,
  67                                      linelen, string,
  68                                      "%s", string);
  69         lines++;
  70
  71         /* Show first line in info column */
  72         if (lines == 1) {
  73             col_append_fstr(pinfo->cinfo, COL_INFO, "(%s", string);
  74         }
  75
  76         /* Move onto next line. */
  77         offset = next_offset;
  78     }
  79
  80     /* Close off summary of sipfrag in info column */
  81     col_append_str(pinfo->cinfo, COL_INFO, (lines > 1) ? "...)" : ")");
  82     return tvb_captured_length(tvb);
  83 }
  84
  85 void proto_register_sipfrag(void)
  86 {
  87     static hf_register_info hf[] =
  88     {
  89         { &hf_sipfrag_line,
  90             { "Line",
  91               "sipfrag.line",FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL
  92             }
  93         },
  94     };
  95
  96     static int *ett[] =
  97     {
  98         &ett_sipfrag
  99     };
 100
 101     /* Register protocol. */
 102     proto_sipfrag = proto_register_protocol("Sipfrag", "SIPFRAG", "sipfrag");
 103     proto_register_field_array(proto_sipfrag, hf, array_length(hf));
 104     proto_register_subtree_array(ett, array_length(ett));
 105
 106     /* Allow other dissectors to find this one by name. */
 107     sipfrag_handle = register_dissector("sipfrag", dissect_sipfrag, proto_sipfrag);
 108 }
 109
 110 void proto_reg_handoff_sipfrag(void)
 111 {
 112     dissector_add_string("media_type", "message/sipfrag", sipfrag_handle);
 113 }
 114
 115 /*
 116  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 117  *
 118  * Local variables:
 119  * c-basic-offset: 4
 120  * tab-width: 8
 121  * indent-tabs-mode: nil
 122  * End:
 123  *
 124  * vi: set shiftwidth=4 tabstop=8 expandtab:
 125  * :indentSize=4:tabSize=8:noTabs=true:
 126  */