/* Routines for sipfrag packet disassembly (RFC 3420)
 *
 * Martin Mathieson
 * Based on packet-sdp.c
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <epan/packet.h>

/*
 * Doesn't do a detailed dissection of the lines of the message, just treat as text.
 */

void proto_register_sipfrag(void);

/* Initialize the protocol and registered fields. */
static int proto_sipfrag = -1;
static int hf_sipfrag_line = -1;

/* Protocol subtree. */
static int ett_sipfrag = -1;

void proto_reg_handoff_sipfrag(void);

static dissector_handle_t sipfrag_handle;

/* Main dissection function. */
static int dissect_sipfrag(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
    proto_tree  *sipfrag_tree;
    proto_item  *ti;
    gint        offset = 0;
    gint        next_offset;
    int         linelen;
    char        *string;
    gint        lines = 0;

    /* Append this protocol name rather than replace. */
    col_append_str(pinfo->cinfo, COL_PROTOCOL, "/sipfrag");

    /* Add mention of this protocol to info column */
    col_append_str(pinfo->cinfo, COL_INFO, ", with Sipfrag");

    /* Create sipfrag tree. */
    ti = proto_tree_add_item(tree, proto_sipfrag, tvb, offset, -1, ENC_NA);
    sipfrag_tree = proto_item_add_subtree(ti, ett_sipfrag);

    /* Show the sipfrag message a line at a time. */
    while (tvb_offset_exists(tvb, offset))
    {
        /* Find the end of the line. */
        linelen = tvb_find_line_end_unquoted(tvb, offset, -1, &next_offset);

        /* For now, add all lines as unparsed strings */

        /* Extract & add the string. */
        string = (char*)tvb_get_string_enc(pinfo->pool, tvb, offset, linelen, ENC_ASCII);
        proto_tree_add_string_format(sipfrag_tree, hf_sipfrag_line,
                                     tvb, offset,
                                     linelen, string,
                                     "%s", string);
        lines++;

        /* Show first line in info column */
        if (lines == 1) {
            col_append_fstr(pinfo->cinfo, COL_INFO, "(%s", string);
        }

        /* Move onto next line. */
        offset = next_offset;
    }

    /* Close off summary of sipfrag in info column */
    col_append_str(pinfo->cinfo, COL_INFO, (lines > 1) ? "...)" : ")");
    return tvb_captured_length(tvb);
}

void proto_register_sipfrag(void)
{
    static hf_register_info hf[] =
    {
        { &hf_sipfrag_line,
            { "Line",
              "sipfrag.line",FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL
            }
        },
    };

    static gint *ett[] =
    {
        &ett_sipfrag
    };

    /* Register protocol. */
    proto_sipfrag = proto_register_protocol("Sipfrag", "SIPFRAG", "sipfrag");
    proto_register_field_array(proto_sipfrag, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));

    /* Allow other dissectors to find this one by name. */
    sipfrag_handle = register_dissector("sipfrag", dissect_sipfrag, proto_sipfrag);
}

void proto_reg_handoff_sipfrag(void)
{
    dissector_add_string("media_type", "message/sipfrag", sipfrag_handle);
}

/*
 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */
