mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-11-22 22:41:30 +03:00
6807fa854d
We never sniff for CSS, nor for non-page artefacts (e.g. treeview icons) svn path=/trunk/netsurf/; revision=12707
688 lines
18 KiB
C
688 lines
18 KiB
C
/*
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* Copyright 2011 John-Mark Bell <jmb@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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* MIME type sniffer (implementation)
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*/
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#include<string.h>
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#include "content/content_factory.h"
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#include "content/llcache.h"
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#include "content/mimesniff.h"
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#include "utils/http.h"
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#include "utils/utils.h"
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static lwc_string *unknown_unknown;
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static lwc_string *application_unknown;
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static lwc_string *any;
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static lwc_string *text_xml;
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static lwc_string *application_xml;
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static lwc_string *text_html;
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static lwc_string *text_plain;
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static lwc_string *application_octet_stream;
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static lwc_string *image_gif;
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static lwc_string *image_png;
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static lwc_string *image_jpeg;
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static lwc_string *image_bmp;
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static lwc_string *image_vnd_microsoft_icon;
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static lwc_string *image_webp;
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static lwc_string *application_rss_xml;
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static lwc_string *application_atom_xml;
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static lwc_string *audio_x_wave;
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static lwc_string *application_ogg;
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static lwc_string *video_webm;
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static lwc_string *application_x_rar_compressed;
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static lwc_string *application_zip;
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static lwc_string *application_x_gzip;
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static lwc_string *application_postscript;
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static lwc_string *application_pdf;
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nserror mimesniff_init(void)
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{
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lwc_error lerror;
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#define SINIT(v, s) \
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lerror = lwc_intern_string(s, SLEN(s), &v); \
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if (lerror != lwc_error_ok) \
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return NSERROR_NOMEM
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SINIT(unknown_unknown, "unknown/unknown");
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SINIT(application_unknown, "application/unknown");
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SINIT(any, "*/*");
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SINIT(text_xml, "text/xml");
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SINIT(application_xml, "application/xml");
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SINIT(text_html, "text/html");
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SINIT(text_plain, "text/plain");
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SINIT(application_octet_stream, "application/octet-stream");
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SINIT(image_gif, "image/gif");
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SINIT(image_png, "image/png");
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SINIT(image_jpeg, "image/jpeg");
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SINIT(image_bmp, "image/bmp");
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SINIT(image_vnd_microsoft_icon, "image/vnd.microsoft.icon");
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SINIT(image_webp, "image/webp");
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SINIT(application_rss_xml, "application/rss+xml");
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SINIT(application_atom_xml, "application/atom+xml");
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SINIT(audio_x_wave, "audio/x-wave");
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SINIT(application_ogg, "application/ogg");
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SINIT(video_webm, "video/webm");
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SINIT(application_x_rar_compressed, "application/x-rar-compressed");
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SINIT(application_zip, "application/zip");
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SINIT(application_x_gzip, "application/x-gzip");
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SINIT(application_postscript, "application/postscript");
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SINIT(application_pdf, "application/pdf");
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#undef SINIT
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return NSERROR_OK;
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}
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void mimesniff_fini(void)
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{
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lwc_string_unref(application_pdf);
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lwc_string_unref(application_postscript);
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lwc_string_unref(application_x_gzip);
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lwc_string_unref(application_zip);
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lwc_string_unref(application_x_rar_compressed);
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lwc_string_unref(video_webm);
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lwc_string_unref(application_ogg);
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lwc_string_unref(audio_x_wave);
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lwc_string_unref(application_atom_xml);
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lwc_string_unref(application_rss_xml);
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lwc_string_unref(image_webp);
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lwc_string_unref(image_vnd_microsoft_icon);
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lwc_string_unref(image_bmp);
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lwc_string_unref(image_jpeg);
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lwc_string_unref(image_png);
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lwc_string_unref(image_gif);
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lwc_string_unref(application_octet_stream);
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lwc_string_unref(text_plain);
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lwc_string_unref(text_html);
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lwc_string_unref(application_xml);
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lwc_string_unref(text_xml);
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lwc_string_unref(any);
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lwc_string_unref(application_unknown);
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lwc_string_unref(unknown_unknown);
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}
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static bool mimesniff__has_binary_octets(const uint8_t *data, size_t len)
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{
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const uint8_t *end = data + len;
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while (data != end) {
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const uint8_t c = *data;
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/* Binary iff in C0 and not ESC, CR, FF, LF, HT */
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if (c <= 0x1f && c != 0x1b && c != '\r' && c != '\f' &&
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c != '\n' && c != '\t')
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break;
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data++;
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}
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return data != end;
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}
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struct map_s {
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const uint8_t *sig;
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size_t len;
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bool safe;
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lwc_string **type;
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};
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static nserror mimesniff__match_unknown_ws(const uint8_t *data, size_t len,
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lwc_string **effective_type)
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{
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#define SIG(t, s, x) { (const uint8_t *) s, SLEN(s), x, t }
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static const struct map_s ws_exact_match_types[] = {
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SIG(&text_xml, "<?xml", false),
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{ NULL, 0, false, NULL }
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};
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static const struct map_s ws_inexact_match_types[] = {
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SIG(&text_html, "<!DOCTYPE HTML", false),
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SIG(&text_html, "<HTML", false),
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SIG(&text_html, "<HEAD", false),
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SIG(&text_html, "<SCRIPT", false),
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SIG(&text_html, "<IFRAME", false),
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SIG(&text_html, "<H1", false),
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SIG(&text_html, "<DIV", false),
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SIG(&text_html, "<FONT", false),
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SIG(&text_html, "<TABLE", false),
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SIG(&text_html, "<A", false),
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SIG(&text_html, "<STYLE", false),
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SIG(&text_html, "<TITLE", false),
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SIG(&text_html, "<B", false),
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SIG(&text_html, "<BODY", false),
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SIG(&text_html, "<BR", false),
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SIG(&text_html, "<P", false),
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SIG(&text_html, "<!--", false),
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{ NULL, 0, false, NULL }
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};
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#undef SIG
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const uint8_t *end = data + len;
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const struct map_s *it;
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/* Skip leading whitespace */
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while (data != end) {
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const uint8_t c = *data;
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if (c != '\t' && c != '\n' && c != '\f' &&
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c != '\r' && c != ' ')
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break;
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data++;
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len--;
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}
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if (data == end)
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return NSERROR_NOT_FOUND;
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for (it = ws_exact_match_types; it->sig != NULL; it++) {
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if (it->len <= len && memcmp(data, it->sig, it->len) == 0) {
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*effective_type = lwc_string_ref(*it->type);
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return NSERROR_OK;
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}
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}
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for (it = ws_inexact_match_types; it->sig != NULL; it++) {
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/* +1 for trailing space or > */
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if (len < it->len + 1)
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continue;
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if (strncasecmp((const char *) data,
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(const char *) it->sig, it->len) == 0 &&
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(data[it->len] == ' ' ||
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data[it->len] == '>')) {
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*effective_type = lwc_string_ref(*it->type);
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return NSERROR_OK;
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}
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}
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return NSERROR_NOT_FOUND;
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}
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static nserror mimesniff__match_unknown_bom(const uint8_t *data, size_t len,
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lwc_string **effective_type)
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{
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#define SIG(t, s, x) { (const uint8_t *) s, SLEN(s), x, t }
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static const struct map_s bom_match_types[] = {
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SIG(&text_plain, "\xfe\xff", false),
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SIG(&text_plain, "\xff\xfe", false),
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SIG(&text_plain, "\xef\xbb\xbf", false),
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{ NULL, 0, false, NULL }
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};
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#undef SIG
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const struct map_s *it;
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for (it = bom_match_types; it->sig != NULL; it++) {
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if (it->len <= len && memcmp(data, it->sig, it->len) == 0) {
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*effective_type = lwc_string_ref(*it->type);
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return NSERROR_OK;
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}
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}
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return NSERROR_NOT_FOUND;
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}
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static nserror mimesniff__match_unknown_riff(const uint8_t *data, size_t len,
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lwc_string **effective_type)
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{
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#define SIG(t, s, x) { (const uint8_t *) s, SLEN(s), x, t }
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static const struct map_s riff_match_types[] = {
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SIG(&image_webp, "WEBPVP", true),
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SIG(&audio_x_wave, "WAVE", true),
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{ NULL, 0, false, NULL }
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};
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#undef SIG
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const struct map_s *it;
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for (it = riff_match_types; it->sig != NULL; it++) {
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if (it->len + SLEN("RIFF????") <= len &&
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memcmp(data, "RIFF", SLEN("RIFF")) == 0 &&
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memcmp(data + SLEN("RIFF????"),
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it->sig, it->len) == 0) {
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*effective_type = lwc_string_ref(*it->type);
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return NSERROR_OK;
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}
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}
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return NSERROR_NOT_FOUND;
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}
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static nserror mimesniff__match_unknown_exact(const uint8_t *data, size_t len,
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bool allow_unsafe, lwc_string **effective_type)
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{
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#define SIG(t, s, x) { (const uint8_t *) s, SLEN(s), x, t }
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static const struct map_s exact_match_types[] = {
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SIG(&image_gif, "GIF87a", true),
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SIG(&image_gif, "GIF89a", true),
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SIG(&image_png, "\x89PNG\r\n\x1a\n", true),
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SIG(&image_jpeg, "\xff\xd8\xff", true),
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SIG(&image_bmp, "BM", true),
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SIG(&image_vnd_microsoft_icon, "\x00\x00\x01\x00", true),
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SIG(&application_ogg, "OggS\x00", true),
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SIG(&video_webm, "\x1a\x45\xdf\xa3", true),
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SIG(&application_x_rar_compressed, "Rar \x1a\x07\x00", true),
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SIG(&application_zip, "PK\x03\x04", true),
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SIG(&application_x_gzip, "\x1f\x8b\x08", true),
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SIG(&application_postscript, "%!PS-Adobe-", true),
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SIG(&application_pdf, "%PDF-", false),
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{ NULL, 0, false, NULL }
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};
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#undef SIG
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const struct map_s *it;
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for (it = exact_match_types; it->sig != NULL; it++) {
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if (it->len <= len && memcmp(data, it->sig, it->len) == 0 &&
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(allow_unsafe || it->safe)) {
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*effective_type = lwc_string_ref(*it->type);
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return NSERROR_OK;
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}
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}
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return NSERROR_NOT_FOUND;
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}
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static nserror mimesniff__match_unknown(const uint8_t *data, size_t len,
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bool allow_unsafe, lwc_string **effective_type)
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{
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if (mimesniff__match_unknown_exact(data, len, allow_unsafe,
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effective_type) == NSERROR_OK)
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return NSERROR_OK;
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if (mimesniff__match_unknown_riff(data, len,
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effective_type) == NSERROR_OK)
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return NSERROR_OK;
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if (allow_unsafe == false)
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return NSERROR_NOT_FOUND;
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if (mimesniff__match_unknown_bom(data, len,
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effective_type) == NSERROR_OK)
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return NSERROR_OK;
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if (mimesniff__match_unknown_ws(data, len,
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effective_type) == NSERROR_OK)
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return NSERROR_OK;
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return NSERROR_NOT_FOUND;
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}
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static nserror mimesniff__compute_unknown(const uint8_t *data, size_t len,
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lwc_string **effective_type)
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{
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if (data == NULL)
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return NSERROR_NEED_DATA;
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len = min(len, 512);
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if (mimesniff__match_unknown(data, len, true,
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effective_type) == NSERROR_OK)
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return NSERROR_OK;
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if (mimesniff__has_binary_octets(data, len) == false) {
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/* No binary octets => text/plain */
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*effective_type = lwc_string_ref(text_plain);
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return NSERROR_OK;
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}
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*effective_type = lwc_string_ref(application_octet_stream);
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return NSERROR_OK;
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}
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static nserror mimesniff__compute_text_or_binary(const uint8_t *data,
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size_t len, lwc_string **effective_type)
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{
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if (data == NULL)
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return NSERROR_NEED_DATA;
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len = min(len, 512);
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if (len >= 3 && ((data[0] == 0xfe && data[1] == 0xff) ||
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(data[0] == 0xff && data[1] == 0xfe) ||
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(data[0] == 0xef && data[1] == 0xbb &&
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data[2] == 0xbf))) {
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/* Found a BOM => text/plain */
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*effective_type = lwc_string_ref(text_plain);
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return NSERROR_OK;
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}
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if (mimesniff__has_binary_octets(data, len) == false) {
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/* No binary octets => text/plain */
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*effective_type = lwc_string_ref(text_plain);
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return NSERROR_OK;
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}
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if (mimesniff__match_unknown(data, len, false,
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effective_type) == NSERROR_OK)
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return NSERROR_OK;
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*effective_type = lwc_string_ref(application_octet_stream);
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return NSERROR_OK;
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}
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static nserror mimesniff__compute_image(lwc_string *official_type,
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const uint8_t *data, size_t len, lwc_string **effective_type)
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{
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#define SIG(t, s) { (const uint8_t *) s, SLEN(s), t }
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static const struct it_s {
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const uint8_t *sig;
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size_t len;
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lwc_string **type;
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} image_types[] = {
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SIG(&image_gif, "GIF87a"),
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SIG(&image_gif, "GIF89a"),
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SIG(&image_png, "\x89PNG\r\n\x1a\n"),
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SIG(&image_jpeg, "\xff\xd8\xff"),
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SIG(&image_bmp, "BM"),
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SIG(&image_vnd_microsoft_icon, "\x00\x00\x01\x00"),
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{ NULL, 0, NULL }
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};
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#undef SIG
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const struct it_s *it;
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if (data == NULL)
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return NSERROR_NEED_DATA;
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for (it = image_types; it->sig != NULL; it++) {
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if (it->len <= len && memcmp(data, it->sig, it->len) == 0) {
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lwc_string_unref(official_type);
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*effective_type = lwc_string_ref(*it->type);
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return NSERROR_OK;
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}
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}
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/* WebP has a signature that doesn't fit into the above table */
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if (SLEN("RIFF????WEBPVP") <= len &&
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memcmp(data, "RIFF", SLEN("RIFF")) == 0 &&
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memcmp(data + SLEN("RIFF????"),
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"WEBPVP", SLEN("WEBPVP")) == 0 ) {
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lwc_string_unref(official_type);
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*effective_type = lwc_string_ref(image_webp);
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return NSERROR_OK;
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}
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*effective_type = official_type;
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return NSERROR_OK;
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}
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static nserror mimesniff__compute_feed_or_html(const uint8_t *data,
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size_t len, lwc_string **effective_type)
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{
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#define RDF_NS "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
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#define RSS_NS "http://purl.org/rss/1.0"
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enum state_e {
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BEFORE_BOM,
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BEFORE_MARKUP,
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MARKUP_START,
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COMMENT_OR_DOCTYPE,
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IN_COMMENT,
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IN_DOCTYPE,
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IN_PI,
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IN_TAG,
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IN_RDF
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} state = BEFORE_BOM;
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bool rdf = false, rss = false;
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const uint8_t *end;
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if (data == NULL)
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return NSERROR_NEED_DATA;
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end = data + min(len, 512);
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while (data < end) {
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const uint8_t c = *data;
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#define MATCH(s) SLEN(s) <= (size_t) (end - data) && \
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memcmp(data, s, SLEN(s)) == 0
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switch (state) {
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case BEFORE_BOM:
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if (3 <= end - data && c == 0xef && data[1] == 0xbb &&
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data[2] == 0xbf) {
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data += 3;
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}
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state = BEFORE_MARKUP;
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break;
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case BEFORE_MARKUP:
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if (c == '\t' || c == '\n' || c == '\r' || c == ' ')
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data++;
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else if (c != '<')
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data = end;
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else {
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state = MARKUP_START;
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data++;
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}
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break;
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|
case MARKUP_START:
|
|
if (c == '!') {
|
|
state = COMMENT_OR_DOCTYPE;
|
|
data++;
|
|
} else if (c == '?') {
|
|
state = IN_PI;
|
|
data++;
|
|
} else {
|
|
/* Reconsume input */
|
|
state = IN_TAG;
|
|
}
|
|
break;
|
|
case COMMENT_OR_DOCTYPE:
|
|
if (2 <= end - data && c == '-' && data[1] == '-') {
|
|
state = IN_COMMENT;
|
|
data += 2;
|
|
} else {
|
|
/* Reconsume input */
|
|
state = IN_DOCTYPE;
|
|
}
|
|
break;
|
|
case IN_COMMENT:
|
|
if (3 <= end - data && c == '-' && data[1] == '-' &&
|
|
data[2] == '>') {
|
|
state = BEFORE_MARKUP;
|
|
data += 3;
|
|
} else
|
|
data++;
|
|
break;
|
|
case IN_DOCTYPE:
|
|
if (c == '>')
|
|
state = BEFORE_MARKUP;
|
|
data++;
|
|
break;
|
|
case IN_PI:
|
|
if (2 <= end - data && c == '?' && data[1] == '>') {
|
|
state = BEFORE_MARKUP;
|
|
data += 2;
|
|
} else
|
|
data++;
|
|
break;
|
|
case IN_TAG:
|
|
if (MATCH("rss")) {
|
|
*effective_type =
|
|
lwc_string_ref(application_rss_xml);
|
|
return NSERROR_OK;
|
|
} else if (MATCH("feed")) {
|
|
*effective_type =
|
|
lwc_string_ref(application_atom_xml);
|
|
return NSERROR_OK;
|
|
} else if (MATCH("rdf:RDF")) {
|
|
state = IN_RDF;
|
|
data += SLEN("rdf:RDF");
|
|
} else
|
|
data = end;
|
|
break;
|
|
case IN_RDF:
|
|
if (MATCH(RSS_NS)) {
|
|
rss = true;
|
|
data += SLEN(RSS_NS);
|
|
} else if (MATCH(RDF_NS)) {
|
|
rdf = true;
|
|
data += SLEN(RDF_NS);
|
|
} else
|
|
data++;
|
|
|
|
if (rdf && rss) {
|
|
*effective_type =
|
|
lwc_string_ref(application_rss_xml);
|
|
return NSERROR_OK;
|
|
}
|
|
|
|
break;
|
|
}
|
|
#undef MATCH
|
|
}
|
|
|
|
*effective_type = lwc_string_ref(text_html);
|
|
|
|
return NSERROR_OK;
|
|
|
|
#undef RSS_NS
|
|
#undef RDF_NS
|
|
}
|
|
|
|
/* See mimesniff.h for documentation */
|
|
nserror mimesniff_compute_effective_type(llcache_handle *handle,
|
|
const uint8_t *data, size_t len, bool sniff_allowed,
|
|
lwc_string **effective_type)
|
|
{
|
|
#define S(s) { s, SLEN(s) }
|
|
static const struct tt_s {
|
|
const char *data;
|
|
size_t len;
|
|
} text_types[] = {
|
|
S("text/plain"),
|
|
S("text/plain; charset=ISO-8859-1"),
|
|
S("text/plain; charset=iso-8859-1"),
|
|
S("text/plain; charset=UTF-8"),
|
|
{ NULL, 0 }
|
|
};
|
|
#undef S
|
|
|
|
const char *content_type_header;
|
|
size_t content_type_header_len;
|
|
http_content_type *ct;
|
|
const struct tt_s *tt;
|
|
bool match;
|
|
nserror error;
|
|
|
|
content_type_header =
|
|
llcache_handle_get_header(handle, "Content-Type");
|
|
if (content_type_header == NULL) {
|
|
if (sniff_allowed == false)
|
|
return NSERROR_NOT_FOUND;
|
|
|
|
/* No official type => unknown */
|
|
return mimesniff__compute_unknown(data, len, effective_type);
|
|
}
|
|
|
|
error = http_parse_content_type(content_type_header, &ct);
|
|
if (error != NSERROR_OK) {
|
|
if (sniff_allowed == false)
|
|
return NSERROR_NOT_FOUND;
|
|
|
|
/* Unparseable => unknown */
|
|
return mimesniff__compute_unknown(data, len, effective_type);
|
|
}
|
|
|
|
if (sniff_allowed == false) {
|
|
*effective_type = lwc_string_ref(ct->media_type);
|
|
http_content_type_destroy(ct);
|
|
return NSERROR_OK;
|
|
}
|
|
|
|
content_type_header_len = strlen(content_type_header);
|
|
|
|
/* Look for text types */
|
|
for (tt = text_types; tt->data != NULL; tt++) {
|
|
if (tt->len == content_type_header_len &&
|
|
memcmp(tt->data, content_type_header,
|
|
content_type_header_len) == 0) {
|
|
http_content_type_destroy(ct);
|
|
return mimesniff__compute_text_or_binary(data, len,
|
|
effective_type);
|
|
}
|
|
}
|
|
|
|
/* unknown/unknown, application/unknown, * / * */
|
|
if ((lwc_string_caseless_isequal(ct->media_type, unknown_unknown,
|
|
&match) == lwc_error_ok && match) ||
|
|
(lwc_string_caseless_isequal(ct->media_type,
|
|
application_unknown, &match) == lwc_error_ok &&
|
|
match) ||
|
|
(lwc_string_caseless_isequal(ct->media_type, any,
|
|
&match) == lwc_error_ok && match)) {
|
|
http_content_type_destroy(ct);
|
|
return mimesniff__compute_unknown(data, len, effective_type);
|
|
}
|
|
|
|
/* +xml */
|
|
if (lwc_string_length(ct->media_type) > SLEN("+xml") &&
|
|
strncasecmp(lwc_string_data(ct->media_type) +
|
|
lwc_string_length(ct->media_type) -
|
|
SLEN("+xml"),
|
|
"+xml", SLEN("+xml")) == 0) {
|
|
/* Use official type */
|
|
*effective_type = lwc_string_ref(ct->media_type);
|
|
http_content_type_destroy(ct);
|
|
return NSERROR_OK;
|
|
}
|
|
|
|
/* text/xml, application/xml */
|
|
if ((lwc_string_caseless_isequal(ct->media_type, text_xml,
|
|
&match) == lwc_error_ok && match) ||
|
|
(lwc_string_caseless_isequal(ct->media_type,
|
|
application_xml, &match) == lwc_error_ok &&
|
|
match)) {
|
|
/* Use official type */
|
|
*effective_type = lwc_string_ref(ct->media_type);
|
|
http_content_type_destroy(ct);
|
|
return NSERROR_OK;
|
|
}
|
|
|
|
/* Image types */
|
|
if (content_factory_type_from_mime_type(ct->media_type) ==
|
|
CONTENT_IMAGE) {
|
|
lwc_string *official_type = lwc_string_ref(ct->media_type);
|
|
http_content_type_destroy(ct);
|
|
return mimesniff__compute_image(official_type,
|
|
data, len, effective_type);
|
|
}
|
|
|
|
/* text/html */
|
|
if ((lwc_string_caseless_isequal(ct->media_type, text_html,
|
|
&match) == lwc_error_ok && match)) {
|
|
http_content_type_destroy(ct);
|
|
return mimesniff__compute_feed_or_html(data, len,
|
|
effective_type);
|
|
}
|
|
|
|
/* Use official type */
|
|
*effective_type = lwc_string_ref(ct->media_type);
|
|
|
|
http_content_type_destroy(ct);
|
|
|
|
return NSERROR_OK;
|
|
}
|
|
|