/* packet-text-media.c

 * Routines for text-based media dissection.

 *

 * NOTE - The media type is either found in pinfo->match_string,

 *        or passed into the dissector

 *

 * (C) Olivier Biot, 2004.

 *

 * Refer to the AUTHORS file or the AUTHORS section in the man page

 * for contacting the author(s) of this file.

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

/* Edit this file with 4-space tabs */

#include "config.h"

#include <epan/packet.h>

#include "packet-media-type.h"

/*

 * Media dissector for line-based text media like text/plain, message/http.

 *

 * TODO - character set and chunked transfer-coding

 */

void proto_register_text_lines(void);

void event_register_text_lines(void);

void proto_reg_handoff_text_lines(void);

void event_reg_handoff_text_lines(void);

/* Filterable header fields */

static int proto_text_lines;

/* Subtrees */

static int ett_text_lines;

/* Dissector handles */

static dissector_handle_t xml_handle;

static int

dissect_text_lines(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)

{

  proto_tree  *subtree;

  proto_item  *ti;

  unsigned  offset = 0, next_offset;

  unsigned  len;

  media_content_info_t *content_info;

  const char  *data_name;

  int length = tvb_captured_length(tvb);

  /* Check if this is actually xml

   * If there is less than 38 characters this is not XML

   * <?xml version="1.0" encoding="UTF-8"?>

   */

  if(length > 38){

    if (tvb_strncaseeql(tvb, 0, "<?xml", 5) == 0){

      call_dissector(xml_handle, tvb, pinfo, tree);

      return length;

    }

  }

  data_name = pinfo->match_string;

  if (! (data_name && data_name[0])) {

    /*

     * No information from "match_string"

     */

    content_info = (media_content_info_t *)data;

    if (content_info == NULL) {

      /*

       * No information from dissector data

       */

      data_name = NULL;

    } else {

      data_name = content_info->media_str;

      if (! (data_name && data_name[0])) {

        /*

         * No information from dissector data

         */

        data_name = NULL;

      }

    }

  }

  if (data_name)

    col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "(%s)",

        data_name);

  if (tree) {

    unsigned lines_read = 0;

    ti = proto_tree_add_item(tree, proto_text_lines,

        tvb, 0, -1, ENC_NA);

    if (data_name)

      proto_item_append_text(ti, ": %s", data_name);

    subtree = proto_item_add_subtree(ti, ett_text_lines);

    /* Read the media line by line */

    while (tvb_offset_exists(tvb, offset)) {

      /*

       * XXX - we need to be passed the parameters

       * of the content type via data parameter,

       * so that we know the character set.  We'd

       * have to handle that character set, which

       * might be a multibyte character set such

       * as "iso-10646-ucs-2", or might require other

       * special processing.

       */

      tvb_find_line_end_remaining(tvb, offset, &len, &next_offset);

      /* We use next_offset - offset instead of len in the

       * call to proto_tree_add_format_text() so it will include the

       * line terminator(s) (\r and/or \n) in the display.

       */

      proto_tree_add_format_text(subtree, tvb, offset, next_offset - offset);

      lines_read++;

      offset = next_offset;

    }

    proto_item_append_text(subtree, " (%u lines)", lines_read);

  }

  return length;

}

static void

common_register_text_lines(void)

{

  static int *ett[] = {

    &ett_text_lines,

  };

  proto_register_subtree_array(ett, array_length(ett));

  proto_text_lines = proto_register_protocol("Line-based text data", "Line-based text data", "data-text-lines");

  register_dissector("data-text-lines", dissect_text_lines, proto_text_lines);

}

void

proto_register_text_lines(void)

{

  common_register_text_lines();

}

void

event_register_text_lines(void)

{

  common_register_text_lines();

}

static void common_reg_handoff_text_lines(void)

{

  dissector_handle_t text_lines_handle;

  text_lines_handle = find_dissector("data-text-lines");

  dissector_add_string("media_type", "text/plain", text_lines_handle); /* RFC 2046 */

  dissector_add_string("media_type", "text/richtext", text_lines_handle);  /* RFC 1341 */

  dissector_add_string("media_type", "text/enriched", text_lines_handle);  /* RFC 1896 */

  dissector_add_string("media_type", "text/parameters", text_lines_handle);

  /* W3C line-based textual media */

  dissector_add_string("media_type", "text/html", text_lines_handle);

  dissector_add_string("media_type", "text/xml-external-parsed-entity", text_lines_handle);

  dissector_add_string("media_type", "text/css", text_lines_handle);

  dissector_add_string("media_type", "application/xml-external-parsed-entity", text_lines_handle);

  dissector_add_string("media_type", "text/javascript", text_lines_handle);

  dissector_add_string("media_type", "application/x-javascript", text_lines_handle);

  dissector_add_string("media_type", "application/x-tia-p25-issi", text_lines_handle);

  dissector_add_string("media_type", "application/x-tia-p25-sndcp", text_lines_handle);

  dissector_add_string("media_type", "application/x-ns-proxy-autoconfig", text_lines_handle);

  dissector_add_string("media_type", "text/vnd.sun.j2me.app-descriptor", text_lines_handle);

  dissector_add_string("media_type", "application/vnd.poc.refer-to", text_lines_handle);

  dissector_add_string("media_type", "application/vnd.drm.message", text_lines_handle);

  dissector_add_string("media_type", "application/x-wms-logplaystats", text_lines_handle);

  dissector_add_string("media_type", "application/x-rtsp-udp-packetpair", text_lines_handle);

  xml_handle = find_dissector_add_dependency("xml", proto_text_lines);

}

void

proto_reg_handoff_text_lines(void)

{

  common_reg_handoff_text_lines();

}

void

event_reg_handoff_text_lines(void)

{

  common_reg_handoff_text_lines();

}

/*

 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html

 *

 * Local variables:

 * c-basic-offset: 8

 * tab-width: 8

 * indent-tabs-mode: t

 * End:

 *

 * vi: set shiftwidth=8 tabstop=8 noexpandtab:

 * :indentSize=8:tabSize=8:noTabs=false:

 */