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Diffstat (limited to 'epan/dissectors/packet-text-media.c')
| -rw-r--r-- | epan/dissectors/packet-text-media.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/epan/dissectors/packet-text-media.c b/epan/dissectors/packet-text-media.c new file mode 100644 index 00000000..1a40eb99 --- /dev/null +++ b/epan/dissectors/packet-text-media.c @@ -0,0 +1,183 @@ +/* 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 proto_reg_handoff_text_lines(void); + +/* Filterable header fields */ +static gint proto_text_lines = -1; + +/* Subtrees */ +static gint ett_text_lines = -1; + +/* 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; + gint offset = 0, next_offset; + gint 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) { + guint 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. + */ + len = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE); + if (len == -1) + break; + + /* 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; +} + +void +proto_register_text_lines(void) +{ + static gint *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_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); +} + +/* + * 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: + */ |