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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/net_util.h"
#include <algorithm>
#include <iterator>
#include <map>
#include "build/build_config.h"
#if defined(OS_WIN)
#include <windows.h>
#include <iphlpapi.h>
#include <winsock2.h>
#pragma comment(lib, "iphlpapi.lib")
#elif defined(OS_POSIX)
#include <fcntl.h>
#if !defined(OS_ANDROID)
#include <ifaddrs.h>
#endif
#include <net/if.h>
#include <netdb.h>
#include <netinet/in.h>
#endif
#include "base/basictypes.h"
#include "base/file_util.h"
#include "base/files/file_path.h"
#include "base/i18n/file_util_icu.h"
#include "base/i18n/icu_string_conversions.h"
#include "base/i18n/time_formatting.h"
#include "base/json/string_escape.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/memory/singleton.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/histogram.h"
#include "base/path_service.h"
#include "base/stl_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_split.h"
#include "base/strings/string_tokenizer.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/sys_string_conversions.h"
#include "base/strings/utf_offset_string_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/synchronization/lock.h"
#include "base/sys_byteorder.h"
#include "base/time/time.h"
#include "base/values.h"
#include "grit/net_resources.h"
#include "url/gurl.h"
#include "url/url_canon.h"
#include "url/url_canon_ip.h"
#include "url/url_parse.h"
#if defined(OS_ANDROID)
#include "net/android/network_library.h"
#endif
#include "net/base/dns_util.h"
#include "net/base/escape.h"
#include "net/base/mime_util.h"
#include "net/base/net_module.h"
#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
#if defined(OS_WIN)
#include "net/base/winsock_init.h"
#endif
#include "net/http/http_content_disposition.h"
#include "third_party/icu/source/common/unicode/uidna.h"
#include "third_party/icu/source/common/unicode/uniset.h"
#include "third_party/icu/source/common/unicode/uscript.h"
#include "third_party/icu/source/common/unicode/uset.h"
#include "third_party/icu/source/i18n/unicode/datefmt.h"
#include "third_party/icu/source/i18n/unicode/regex.h"
#include "third_party/icu/source/i18n/unicode/ulocdata.h"
using base::Time;
namespace net {
namespace {
typedef std::vector<size_t> Offsets;
// what we prepend to get a file URL
static const base::FilePath::CharType kFileURLPrefix[] =
FILE_PATH_LITERAL("file:///");
// The general list of blocked ports. Will be blocked unless a specific
// protocol overrides it. (Ex: ftp can use ports 20 and 21)
static const int kRestrictedPorts[] = {
1, // tcpmux
7, // echo
9, // discard
11, // systat
13, // daytime
15, // netstat
17, // qotd
19, // chargen
20, // ftp data
21, // ftp access
22, // ssh
23, // telnet
25, // smtp
37, // time
42, // name
43, // nicname
53, // domain
77, // priv-rjs
79, // finger
87, // ttylink
95, // supdup
101, // hostriame
102, // iso-tsap
103, // gppitnp
104, // acr-nema
109, // pop2
110, // pop3
111, // sunrpc
113, // auth
115, // sftp
117, // uucp-path
119, // nntp
123, // NTP
135, // loc-srv /epmap
139, // netbios
143, // imap2
179, // BGP
389, // ldap
465, // smtp+ssl
512, // print / exec
513, // login
514, // shell
515, // printer
526, // tempo
530, // courier
531, // chat
532, // netnews
540, // uucp
556, // remotefs
563, // nntp+ssl
587, // stmp?
601, // ??
636, // ldap+ssl
993, // ldap+ssl
995, // pop3+ssl
2049, // nfs
3659, // apple-sasl / PasswordServer
4045, // lockd
6000, // X11
6665, // Alternate IRC [Apple addition]
6666, // Alternate IRC [Apple addition]
6667, // Standard IRC [Apple addition]
6668, // Alternate IRC [Apple addition]
6669, // Alternate IRC [Apple addition]
0xFFFF, // Used to block all invalid port numbers (see
// third_party/WebKit/Source/WebCore/platform/KURLGoogle.cpp, port())
};
// FTP overrides the following restricted ports.
static const int kAllowedFtpPorts[] = {
21, // ftp data
22, // ssh
};
// Does some simple normalization of scripts so we can allow certain scripts
// to exist together.
// TODO(brettw) bug 880223: we should allow some other languages to be
// oombined such as Chinese and Latin. We will probably need a more
// complicated system of language pairs to have more fine-grained control.
UScriptCode NormalizeScript(UScriptCode code) {
switch (code) {
case USCRIPT_KATAKANA:
case USCRIPT_HIRAGANA:
case USCRIPT_KATAKANA_OR_HIRAGANA:
case USCRIPT_HANGUL: // This one is arguable.
return USCRIPT_HAN;
default:
return code;
}
}
bool IsIDNComponentInSingleScript(const base::char16* str, int str_len) {
UScriptCode first_script = USCRIPT_INVALID_CODE;
bool is_first = true;
int i = 0;
while (i < str_len) {
unsigned code_point;
U16_NEXT(str, i, str_len, code_point);
UErrorCode err = U_ZERO_ERROR;
UScriptCode cur_script = uscript_getScript(code_point, &err);
if (err != U_ZERO_ERROR)
return false; // Report mixed on error.
cur_script = NormalizeScript(cur_script);
// TODO(brettw) We may have to check for USCRIPT_INHERENT as well.
if (is_first && cur_script != USCRIPT_COMMON) {
first_script = cur_script;
is_first = false;
} else {
if (cur_script != USCRIPT_COMMON && cur_script != first_script)
return false;
}
}
return true;
}
// Check if the script of a language can be 'safely' mixed with
// Latin letters in the ASCII range.
bool IsCompatibleWithASCIILetters(const std::string& lang) {
// For now, just list Chinese, Japanese and Korean (positive list).
// An alternative is negative-listing (languages using Greek and
// Cyrillic letters), but it can be more dangerous.
return !lang.substr(0, 2).compare("zh") ||
!lang.substr(0, 2).compare("ja") ||
!lang.substr(0, 2).compare("ko");
}
typedef std::map<std::string, icu::UnicodeSet*> LangToExemplarSetMap;
class LangToExemplarSet {
public:
static LangToExemplarSet* GetInstance() {
return Singleton<LangToExemplarSet>::get();
}
private:
LangToExemplarSetMap map;
LangToExemplarSet() { }
~LangToExemplarSet() {
STLDeleteContainerPairSecondPointers(map.begin(), map.end());
}
friend class Singleton<LangToExemplarSet>;
friend struct DefaultSingletonTraits<LangToExemplarSet>;
friend bool GetExemplarSetForLang(const std::string&, icu::UnicodeSet**);
friend void SetExemplarSetForLang(const std::string&, icu::UnicodeSet*);
DISALLOW_COPY_AND_ASSIGN(LangToExemplarSet);
};
bool GetExemplarSetForLang(const std::string& lang,
icu::UnicodeSet** lang_set) {
const LangToExemplarSetMap& map = LangToExemplarSet::GetInstance()->map;
LangToExemplarSetMap::const_iterator pos = map.find(lang);
if (pos != map.end()) {
*lang_set = pos->second;
return true;
}
return false;
}
void SetExemplarSetForLang(const std::string& lang,
icu::UnicodeSet* lang_set) {
LangToExemplarSetMap& map = LangToExemplarSet::GetInstance()->map;
map.insert(std::make_pair(lang, lang_set));
}
static base::LazyInstance<base::Lock>::Leaky
g_lang_set_lock = LAZY_INSTANCE_INITIALIZER;
// Returns true if all the characters in component_characters are used by
// the language |lang|.
bool IsComponentCoveredByLang(const icu::UnicodeSet& component_characters,
const std::string& lang) {
CR_DEFINE_STATIC_LOCAL(
const icu::UnicodeSet, kASCIILetters, ('a', 'z'));
icu::UnicodeSet* lang_set = NULL;
// We're called from both the UI thread and the history thread.
{
base::AutoLock lock(g_lang_set_lock.Get());
if (!GetExemplarSetForLang(lang, &lang_set)) {
UErrorCode status = U_ZERO_ERROR;
ULocaleData* uld = ulocdata_open(lang.c_str(), &status);
// TODO(jungshik) Turn this check on when the ICU data file is
// rebuilt with the minimal subset of locale data for languages
// to which Chrome is not localized but which we offer in the list
// of languages selectable for Accept-Languages. With the rebuilt ICU
// data, ulocdata_open never should fall back to the default locale.
// (issue 2078)
// DCHECK(U_SUCCESS(status) && status != U_USING_DEFAULT_WARNING);
if (U_SUCCESS(status) && status != U_USING_DEFAULT_WARNING) {
lang_set = reinterpret_cast<icu::UnicodeSet *>(
ulocdata_getExemplarSet(uld, NULL, 0,
ULOCDATA_ES_STANDARD, &status));
// If |lang| is compatible with ASCII Latin letters, add them.
if (IsCompatibleWithASCIILetters(lang))
lang_set->addAll(kASCIILetters);
} else {
lang_set = new icu::UnicodeSet(1, 0);
}
lang_set->freeze();
SetExemplarSetForLang(lang, lang_set);
ulocdata_close(uld);
}
}
return !lang_set->isEmpty() && lang_set->containsAll(component_characters);
}
// Returns true if the given Unicode host component is safe to display to the
// user.
bool IsIDNComponentSafe(const base::char16* str,
int str_len,
const std::string& languages) {
// Most common cases (non-IDN) do not reach here so that we don't
// need a fast return path.
// TODO(jungshik) : Check if there's any character inappropriate
// (although allowed) for domain names.
// See http://www.unicode.org/reports/tr39/#IDN_Security_Profiles and
// http://www.unicode.org/reports/tr39/data/xidmodifications.txt
// For now, we borrow the list from Mozilla and tweaked it slightly.
// (e.g. Characters like U+00A0, U+3000, U+3002 are omitted because
// they're gonna be canonicalized to U+0020 and full stop before
// reaching here.)
// The original list is available at
// http://kb.mozillazine.org/Network.IDN.blacklist_chars and
// at http://mxr.mozilla.org/seamonkey/source/modules/libpref/src/init/all.js#703
UErrorCode status = U_ZERO_ERROR;
#ifdef U_WCHAR_IS_UTF16
icu::UnicodeSet dangerous_characters(icu::UnicodeString(
L"[[\\ \u00ad\u00bc\u00bd\u01c3\u0337\u0338"
L"\u05c3\u05f4\u06d4\u0702\u115f\u1160][\u2000-\u200b]"
L"[\u2024\u2027\u2028\u2029\u2039\u203a\u2044\u205f]"
L"[\u2154-\u2156][\u2159-\u215b][\u215f\u2215\u23ae"
L"\u29f6\u29f8\u2afb\u2afd][\u2ff0-\u2ffb][\u3014"
L"\u3015\u3033\u3164\u321d\u321e\u33ae\u33af\u33c6\u33df\ufe14"
L"\ufe15\ufe3f\ufe5d\ufe5e\ufeff\uff0e\uff06\uff61\uffa0\ufff9]"
L"[\ufffa-\ufffd]]"), status);
DCHECK(U_SUCCESS(status));
icu::RegexMatcher dangerous_patterns(icu::UnicodeString(
// Lone katakana no, so, or n
L"[^\\p{Katakana}][\u30ce\u30f3\u30bd][^\\p{Katakana}]"
// Repeating Japanese accent characters
L"|[\u3099\u309a\u309b\u309c][\u3099\u309a\u309b\u309c]"),
0, status);
#else
icu::UnicodeSet dangerous_characters(icu::UnicodeString(
"[[\\u0020\\u00ad\\u00bc\\u00bd\\u01c3\\u0337\\u0338"
"\\u05c3\\u05f4\\u06d4\\u0702\\u115f\\u1160][\\u2000-\\u200b]"
"[\\u2024\\u2027\\u2028\\u2029\\u2039\\u203a\\u2044\\u205f]"
"[\\u2154-\\u2156][\\u2159-\\u215b][\\u215f\\u2215\\u23ae"
"\\u29f6\\u29f8\\u2afb\\u2afd][\\u2ff0-\\u2ffb][\\u3014"
"\\u3015\\u3033\\u3164\\u321d\\u321e\\u33ae\\u33af\\u33c6\\u33df\\ufe14"
"\\ufe15\\ufe3f\\ufe5d\\ufe5e\\ufeff\\uff0e\\uff06\\uff61\\uffa0\\ufff9]"
"[\\ufffa-\\ufffd]]", -1, US_INV), status);
DCHECK(U_SUCCESS(status));
icu::RegexMatcher dangerous_patterns(icu::UnicodeString(
// Lone katakana no, so, or n
"[^\\p{Katakana}][\\u30ce\\u30f3\u30bd][^\\p{Katakana}]"
// Repeating Japanese accent characters
"|[\\u3099\\u309a\\u309b\\u309c][\\u3099\\u309a\\u309b\\u309c]"),
0, status);
#endif
DCHECK(U_SUCCESS(status));
icu::UnicodeSet component_characters;
icu::UnicodeString component_string(str, str_len);
component_characters.addAll(component_string);
if (dangerous_characters.containsSome(component_characters))
return false;
DCHECK(U_SUCCESS(status));
dangerous_patterns.reset(component_string);
if (dangerous_patterns.find())
return false;
// If the language list is empty, the result is completely determined
// by whether a component is a single script or not. This will block
// even "safe" script mixing cases like <Chinese, Latin-ASCII> that are
// allowed with |languages| (while it blocks Chinese + Latin letters with
// an accent as should be the case), but we want to err on the safe side
// when |languages| is empty.
if (languages.empty())
return IsIDNComponentInSingleScript(str, str_len);
// |common_characters| is made up of ASCII numbers, hyphen, plus and
// underscore that are used across scripts and allowed in domain names.
// (sync'd with characters allowed in url_canon_host with square
// brackets excluded.) See kHostCharLookup[] array in url_canon_host.cc.
icu::UnicodeSet common_characters(UNICODE_STRING_SIMPLE("[[0-9]\\-_+\\ ]"),
status);
DCHECK(U_SUCCESS(status));
// Subtract common characters because they're always allowed so that
// we just have to check if a language-specific set contains
// the remainder.
component_characters.removeAll(common_characters);
base::StringTokenizer t(languages, ",");
while (t.GetNext()) {
if (IsComponentCoveredByLang(component_characters, t.token()))
return true;
}
return false;
}
// A wrapper to use LazyInstance<>::Leaky with ICU's UIDNA, a C pointer to
// a UTS46/IDNA 2008 handling object opened with uidna_openUTS46().
//
// We use UTS46 with BiDiCheck to migrate from IDNA 2003 to IDNA 2008 with
// the backward compatibility in mind. What it does:
//
// 1. Use the up-to-date Unicode data.
// 2. Define a case folding/mapping with the up-to-date Unicode data as
// in IDNA 2003.
// 3. Use transitional mechanism for 4 deviation characters (sharp-s,
// final sigma, ZWJ and ZWNJ) for now.
// 4. Continue to allow symbols and punctuations.
// 5. Apply new BiDi check rules more permissive than the IDNA 2003 BiDI rules.
// 6. Do not apply STD3 rules
// 7. Do not allow unassigned code points.
//
// It also closely matches what IE 10 does except for the BiDi check (
// http://goo.gl/3XBhqw ).
// See http://http://unicode.org/reports/tr46/ and references therein
// for more details.
struct UIDNAWrapper {
UIDNAWrapper() {
UErrorCode err = U_ZERO_ERROR;
// TODO(jungshik): Change options as different parties (browsers,
// registrars, search engines) converge toward a consensus.
value = uidna_openUTS46(UIDNA_CHECK_BIDI, &err);
if (U_FAILURE(err))
value = NULL;
}
UIDNA* value;
};
static base::LazyInstance<UIDNAWrapper>::Leaky
g_uidna = LAZY_INSTANCE_INITIALIZER;
// Converts one component of a host (between dots) to IDN if safe. The result
// will be APPENDED to the given output string and will be the same as the input
// if it is not IDN or the IDN is unsafe to display. Returns whether any
// conversion was performed.
bool IDNToUnicodeOneComponent(const base::char16* comp,
size_t comp_len,
const std::string& languages,
base::string16* out) {
DCHECK(out);
if (comp_len == 0)
return false;
// Only transform if the input can be an IDN component.
static const base::char16 kIdnPrefix[] = {'x', 'n', '-', '-'};
if ((comp_len > arraysize(kIdnPrefix)) &&
!memcmp(comp, kIdnPrefix, arraysize(kIdnPrefix) * sizeof(base::char16))) {
UIDNA* uidna = g_uidna.Get().value;
DCHECK(uidna != NULL);
size_t original_length = out->length();
int output_length = 64;
UIDNAInfo info = UIDNA_INFO_INITIALIZER;
UErrorCode status;
do {
out->resize(original_length + output_length);
status = U_ZERO_ERROR;
// This returns the actual length required. If this is more than 64
// code units, |status| will be U_BUFFER_OVERFLOW_ERROR and we'll try
// the conversion again, but with a sufficiently large buffer.
output_length = uidna_labelToUnicode(
uidna, comp, static_cast<int32_t>(comp_len), &(*out)[original_length],
output_length, &info, &status);
} while ((status == U_BUFFER_OVERFLOW_ERROR && info.errors == 0));
if (U_SUCCESS(status) && info.errors == 0) {
// Converted successfully. Ensure that the converted component
// can be safely displayed to the user.
out->resize(original_length + output_length);
if (IsIDNComponentSafe(out->data() + original_length, output_length,
languages))
return true;
}
// Something went wrong. Revert to original string.
out->resize(original_length);
}
// We get here with no IDN or on error, in which case we just append the
// literal input.
out->append(comp, comp_len);
return false;
}
// Clamps the offsets in |offsets_for_adjustment| to the length of |str|.
void LimitOffsets(const base::string16& str, Offsets* offsets_for_adjustment) {
if (offsets_for_adjustment) {
std::for_each(offsets_for_adjustment->begin(),
offsets_for_adjustment->end(),
base::LimitOffset<base::string16>(str.length()));
}
}
// TODO(brettw) bug 734373: check the scripts for each host component and
// don't un-IDN-ize if there is more than one. Alternatively, only IDN for
// scripts that the user has installed. For now, just put the entire
// path through IDN. Maybe this feature can be implemented in ICU itself?
//
// We may want to skip this step in the case of file URLs to allow unicode
// UNC hostnames regardless of encodings.
base::string16 IDNToUnicodeWithOffsets(const std::string& host,
const std::string& languages,
Offsets* offsets_for_adjustment) {
// Convert the ASCII input to a base::string16 for ICU.
base::string16 input16;
input16.reserve(host.length());
input16.insert(input16.end(), host.begin(), host.end());
// Do each component of the host separately, since we enforce script matching
// on a per-component basis.
base::string16 out16;
{
base::OffsetAdjuster offset_adjuster(offsets_for_adjustment);
for (size_t component_start = 0, component_end;
component_start < input16.length();
component_start = component_end + 1) {
// Find the end of the component.
component_end = input16.find('.', component_start);
if (component_end == base::string16::npos)
component_end = input16.length(); // For getting the last component.
size_t component_length = component_end - component_start;
size_t new_component_start = out16.length();
bool converted_idn = false;
if (component_end > component_start) {
// Add the substring that we just found.
converted_idn = IDNToUnicodeOneComponent(
input16.data() + component_start, component_length, languages,
&out16);
}
size_t new_component_length = out16.length() - new_component_start;
if (converted_idn && offsets_for_adjustment) {
offset_adjuster.Add(base::OffsetAdjuster::Adjustment(component_start,
component_length, new_component_length));
}
// Need to add the dot we just found (if we found one).
if (component_end < input16.length())
out16.push_back('.');
}
}
LimitOffsets(out16, offsets_for_adjustment);
return out16;
}
// Called after transforming a component to set all affected elements in
// |offsets_for_adjustment| to the correct new values. |original_offsets|
// represents the offsets before the transform; |original_component_begin| and
// |original_component_end| represent the pre-transform boundaries of the
// affected component. |transformed_offsets| should be a vector created by
// adjusting |original_offsets| to be relative to the beginning of the component
// in question (via an OffsetAdjuster) and then transformed along with the
// component. Note that any elements in this vector which didn't originally
// point into the component may contain arbitrary values and should be ignored.
// |transformed_component_begin| and |transformed_component_end| are the
// endpoints of the transformed component and are used in combination with the
// two offset vectors to calculate the resulting absolute offsets, which are
// stored in |offsets_for_adjustment|.
void AdjustForComponentTransform(const Offsets& original_offsets,
size_t original_component_begin,
size_t original_component_end,
const Offsets& transformed_offsets,
size_t transformed_component_begin,
size_t transformed_component_end,
Offsets* offsets_for_adjustment) {
if (!offsets_for_adjustment)
return; // Nothing to do.
for (size_t i = 0; i < original_offsets.size(); ++i) {
size_t original_offset = original_offsets[i];
if ((original_offset >= original_component_begin) &&
(original_offset < original_component_end)) {
// This offset originally pointed into the transformed component.
// Adjust the transformed relative offset by the new beginning point of
// the transformed component.
size_t transformed_offset = transformed_offsets[i];
(*offsets_for_adjustment)[i] =
(transformed_offset == base::string16::npos) ?
base::string16::npos :
(transformed_offset + transformed_component_begin);
} else if ((original_offset >= original_component_end) &&
(original_offset != std::string::npos)) {
// This offset pointed after the transformed component. Adjust the
// original absolute offset by the difference between the new and old
// component lengths.
(*offsets_for_adjustment)[i] =
original_offset - original_component_end + transformed_component_end;
}
}
}
// If |component| is valid, its begin is incremented by |delta|.
void AdjustComponent(int delta, url_parse::Component* component) {
if (!component->is_valid())
return;
DCHECK(delta >= 0 || component->begin >= -delta);
component->begin += delta;
}
// Adjusts all the components of |parsed| by |delta|, except for the scheme.
void AdjustAllComponentsButScheme(int delta, url_parse::Parsed* parsed) {
AdjustComponent(delta, &(parsed->username));
AdjustComponent(delta, &(parsed->password));
AdjustComponent(delta, &(parsed->host));
AdjustComponent(delta, &(parsed->port));
AdjustComponent(delta, &(parsed->path));
AdjustComponent(delta, &(parsed->query));
AdjustComponent(delta, &(parsed->ref));
}
// Helper for FormatUrlWithOffsets().
base::string16 FormatViewSourceUrl(const GURL& url,
const Offsets& original_offsets,
const std::string& languages,
FormatUrlTypes format_types,
UnescapeRule::Type unescape_rules,
url_parse::Parsed* new_parsed,
size_t* prefix_end,
Offsets* offsets_for_adjustment) {
DCHECK(new_parsed);
const char kViewSource[] = "view-source:";
const size_t kViewSourceLength = arraysize(kViewSource) - 1;
// Format the underlying URL and adjust offsets.
const std::string& url_str(url.possibly_invalid_spec());
Offsets offsets_into_underlying_url(original_offsets);
{
base::OffsetAdjuster adjuster(&offsets_into_underlying_url);
adjuster.Add(base::OffsetAdjuster::Adjustment(0, kViewSourceLength, 0));
}
base::string16 result(ASCIIToUTF16(kViewSource) +
FormatUrlWithOffsets(GURL(url_str.substr(kViewSourceLength)), languages,
format_types, unescape_rules, new_parsed, prefix_end,
&offsets_into_underlying_url));
AdjustForComponentTransform(original_offsets, kViewSourceLength,
url_str.length(), offsets_into_underlying_url,
kViewSourceLength, result.length(),
offsets_for_adjustment);
LimitOffsets(result, offsets_for_adjustment);
// Adjust positions of the parsed components.
if (new_parsed->scheme.is_nonempty()) {
// Assume "view-source:real-scheme" as a scheme.
new_parsed->scheme.len += kViewSourceLength;
} else {
new_parsed->scheme.begin = 0;
new_parsed->scheme.len = kViewSourceLength - 1;
}
AdjustAllComponentsButScheme(kViewSourceLength, new_parsed);
if (prefix_end)
*prefix_end += kViewSourceLength;
return result;
}
class AppendComponentTransform {
public:
AppendComponentTransform() {}
virtual ~AppendComponentTransform() {}
virtual base::string16 Execute(const std::string& component_text,
Offsets* offsets_into_component) const = 0;
// NOTE: No DISALLOW_COPY_AND_ASSIGN here, since gcc < 4.3.0 requires an
// accessible copy constructor in order to call AppendFormattedComponent()
// with an inline temporary (see http://gcc.gnu.org/bugs/#cxx%5Frvalbind ).
};
class HostComponentTransform : public AppendComponentTransform {
public:
explicit HostComponentTransform(const std::string& languages)
: languages_(languages) {
}
private:
virtual base::string16 Execute(
const std::string& component_text,
Offsets* offsets_into_component) const OVERRIDE {
return IDNToUnicodeWithOffsets(component_text, languages_,
offsets_into_component);
}
const std::string& languages_;
};
class NonHostComponentTransform : public AppendComponentTransform {
public:
explicit NonHostComponentTransform(UnescapeRule::Type unescape_rules)
: unescape_rules_(unescape_rules) {
}
private:
virtual base::string16 Execute(
const std::string& component_text,
Offsets* offsets_into_component) const OVERRIDE {
return (unescape_rules_ == UnescapeRule::NONE) ?
base::UTF8ToUTF16AndAdjustOffsets(component_text,
offsets_into_component) :
UnescapeAndDecodeUTF8URLComponentWithOffsets(component_text,
unescape_rules_, offsets_into_component);
}
const UnescapeRule::Type unescape_rules_;
};
// Transforms the portion of |spec| covered by |original_component| according to
// |transform|. Appends the result to |output|. If |output_component| is
// non-NULL, its start and length are set to the transformed component's new
// start and length. For each element in |original_offsets| which is at least
// as large as original_component.begin, the corresponding element of
// |offsets_for_adjustment| is transformed appropriately.
void AppendFormattedComponent(const std::string& spec,
const url_parse::Component& original_component,
const Offsets& original_offsets,
const AppendComponentTransform& transform,
base::string16* output,
url_parse::Component* output_component,
Offsets* offsets_for_adjustment) {
DCHECK(output);
if (original_component.is_nonempty()) {
size_t original_component_begin =
static_cast<size_t>(original_component.begin);
size_t output_component_begin = output->length();
std::string component_str(spec, original_component_begin,
static_cast<size_t>(original_component.len));
// Transform |component_str| and adjust the offsets accordingly.
Offsets offsets_into_component(original_offsets);
{
base::OffsetAdjuster adjuster(&offsets_into_component);
adjuster.Add(base::OffsetAdjuster::Adjustment(0, original_component_begin,
0));
}
output->append(transform.Execute(component_str, &offsets_into_component));
AdjustForComponentTransform(original_offsets, original_component_begin,
static_cast<size_t>(original_component.end()),
offsets_into_component, output_component_begin,
output->length(), offsets_for_adjustment);
// Set positions of the parsed component.
if (output_component) {
output_component->begin = static_cast<int>(output_component_begin);
output_component->len =
static_cast<int>(output->length() - output_component_begin);
}
} else if (output_component) {
output_component->reset();
}
}
void SanitizeGeneratedFileName(base::FilePath::StringType* filename,
bool replace_trailing) {
const base::FilePath::CharType kReplace[] = FILE_PATH_LITERAL("-");
if (filename->empty())
return;
if (replace_trailing) {
// Handle CreateFile() stripping trailing dots and spaces on filenames
// http://support.microsoft.com/kb/115827
size_t length = filename->size();
size_t pos = filename->find_last_not_of(FILE_PATH_LITERAL(" ."));
filename->resize((pos == std::string::npos) ? 0 : (pos + 1));
TrimWhitespace(*filename, TRIM_TRAILING, filename);
if (filename->empty())
return;
size_t trimmed = length - filename->size();
if (trimmed)
filename->insert(filename->end(), trimmed, kReplace[0]);
}
base::TrimString(*filename, FILE_PATH_LITERAL("."), filename);
if (filename->empty())
return;
// Replace any path information by changing path separators.
ReplaceSubstringsAfterOffset(filename, 0, FILE_PATH_LITERAL("/"), kReplace);
ReplaceSubstringsAfterOffset(filename, 0, FILE_PATH_LITERAL("\\"), kReplace);
}
// Returns the filename determined from the last component of the path portion
// of the URL. Returns an empty string if the URL doesn't have a path or is
// invalid. If the generated filename is not reliable,
// |should_overwrite_extension| will be set to true, in which case a better
// extension should be determined based on the content type.
std::string GetFileNameFromURL(const GURL& url,
const std::string& referrer_charset,
bool* should_overwrite_extension) {
// about: and data: URLs don't have file names, but esp. data: URLs may
// contain parts that look like ones (i.e., contain a slash). Therefore we
// don't attempt to divine a file name out of them.
if (!url.is_valid() || url.SchemeIs("about") || url.SchemeIs("data"))
return std::string();
const std::string unescaped_url_filename = UnescapeURLComponent(
url.ExtractFileName(),
UnescapeRule::SPACES | UnescapeRule::URL_SPECIAL_CHARS);
// The URL's path should be escaped UTF-8, but may not be.
std::string decoded_filename = unescaped_url_filename;
if (!IsStringUTF8(decoded_filename)) {
// TODO(jshin): this is probably not robust enough. To be sure, we need
// encoding detection.
base::string16 utf16_output;
if (!referrer_charset.empty() &&
base::CodepageToUTF16(unescaped_url_filename,
referrer_charset.c_str(),
base::OnStringConversionError::FAIL,
&utf16_output)) {
decoded_filename = UTF16ToUTF8(utf16_output);
} else {
decoded_filename = WideToUTF8(
base::SysNativeMBToWide(unescaped_url_filename));
}
}
// If the URL contains a (possibly empty) query, assume it is a generator, and
// allow the determined extension to be overwritten.
*should_overwrite_extension = !decoded_filename.empty() && url.has_query();
return decoded_filename;
}
// Returns whether the specified extension is automatically integrated into the
// windows shell.
bool IsShellIntegratedExtension(const base::FilePath::StringType& extension) {
base::FilePath::StringType extension_lower = StringToLowerASCII(extension);
// http://msdn.microsoft.com/en-us/library/ms811694.aspx
// Right-clicking on shortcuts can be magical.
if ((extension_lower == FILE_PATH_LITERAL("local")) ||
(extension_lower == FILE_PATH_LITERAL("lnk")))
return true;
// http://www.juniper.net/security/auto/vulnerabilities/vuln2612.html
// Files become magical if they end in a CLSID, so block such extensions.
if (!extension_lower.empty() &&
(extension_lower[0] == FILE_PATH_LITERAL('{')) &&
(extension_lower[extension_lower.length() - 1] == FILE_PATH_LITERAL('}')))
return true;
return false;
}
// Returns whether the specified file name is a reserved name on windows.
// This includes names like "com2.zip" (which correspond to devices) and
// desktop.ini and thumbs.db which have special meaning to the windows shell.
bool IsReservedName(const base::FilePath::StringType& filename) {
// This list is taken from the MSDN article "Naming a file"
// http://msdn2.microsoft.com/en-us/library/aa365247(VS.85).aspx
// I also added clock$ because GetSaveFileName seems to consider it as a
// reserved name too.
static const char* const known_devices[] = {
"con", "prn", "aux", "nul", "com1", "com2", "com3", "com4", "com5",
"com6", "com7", "com8", "com9", "lpt1", "lpt2", "lpt3", "lpt4",
"lpt5", "lpt6", "lpt7", "lpt8", "lpt9", "clock$"
};
#if defined(OS_WIN)
std::string filename_lower = StringToLowerASCII(WideToUTF8(filename));
#elif defined(OS_POSIX)
std::string filename_lower = StringToLowerASCII(filename);
#endif
for (size_t i = 0; i < arraysize(known_devices); ++i) {
// Exact match.
if (filename_lower == known_devices[i])
return true;
// Starts with "DEVICE.".
if (filename_lower.find(std::string(known_devices[i]) + ".") == 0)
return true;
}
static const char* const magic_names[] = {
// These file names are used by the "Customize folder" feature of the shell.
"desktop.ini",
"thumbs.db",
};
for (size_t i = 0; i < arraysize(magic_names); ++i) {
if (filename_lower == magic_names[i])
return true;
}
return false;
}
// Examines the current extension in |file_name| and modifies it if necessary in
// order to ensure the filename is safe. If |file_name| doesn't contain an
// extension or if |ignore_extension| is true, then a new extension will be
// constructed based on the |mime_type|.
//
// We're addressing two things here:
//
// 1) Usability. If there is no reliable file extension, we want to guess a
// reasonable file extension based on the content type.
//
// 2) Shell integration. Some file extensions automatically integrate with the
// shell. We block these extensions to prevent a malicious web site from
// integrating with the user's shell.
void EnsureSafeExtension(const std::string& mime_type,
bool ignore_extension,
base::FilePath* file_name) {
// See if our file name already contains an extension.
base::FilePath::StringType extension = file_name->Extension();
if (!extension.empty())
extension.erase(extension.begin()); // Erase preceding '.'.
if ((ignore_extension || extension.empty()) && !mime_type.empty()) {
base::FilePath::StringType preferred_mime_extension;
std::vector<base::FilePath::StringType> all_mime_extensions;
// The GetPreferredExtensionForMimeType call will end up going to disk. Do
// this on another thread to avoid slowing the IO thread.
// http://crbug.com/61827
// TODO(asanka): Remove this ScopedAllowIO once all callers have switched
// over to IO safe threads.
base::ThreadRestrictions::ScopedAllowIO allow_io;
net::GetPreferredExtensionForMimeType(mime_type, &preferred_mime_extension);
net::GetExtensionsForMimeType(mime_type, &all_mime_extensions);
// If the existing extension is in the list of valid extensions for the
// given type, use it. This avoids doing things like pointlessly renaming
// "foo.jpg" to "foo.jpeg".
if (std::find(all_mime_extensions.begin(),
all_mime_extensions.end(),
extension) != all_mime_extensions.end()) {
// leave |extension| alone
} else if (!preferred_mime_extension.empty()) {
extension = preferred_mime_extension;
}
}
#if defined(OS_WIN)
static const base::FilePath::CharType default_extension[] =
FILE_PATH_LITERAL("download");
// Rename shell-integrated extensions.
// TODO(asanka): Consider stripping out the bad extension and replacing it
// with the preferred extension for the MIME type if one is available.
if (IsShellIntegratedExtension(extension))
extension.assign(default_extension);
#endif
*file_name = file_name->ReplaceExtension(extension);
}
bool FilePathToString16(const base::FilePath& path, base::string16* converted) {
#if defined(OS_WIN)
return WideToUTF16(path.value().c_str(), path.value().size(), converted);
#elif defined(OS_POSIX)
std::string component8 = path.AsUTF8Unsafe();
return !component8.empty() &&
UTF8ToUTF16(component8.c_str(), component8.size(), converted);
#endif
}
bool IPNumberPrefixCheck(const IPAddressNumber& ip_number,
const unsigned char* ip_prefix,
size_t prefix_length_in_bits) {
// Compare all the bytes that fall entirely within the prefix.
int num_entire_bytes_in_prefix = prefix_length_in_bits / 8;
for (int i = 0; i < num_entire_bytes_in_prefix; ++i) {
if (ip_number[i] != ip_prefix[i])
return false;
}
// In case the prefix was not a multiple of 8, there will be 1 byte
// which is only partially masked.
int remaining_bits = prefix_length_in_bits % 8;
if (remaining_bits != 0) {
unsigned char mask = 0xFF << (8 - remaining_bits);
int i = num_entire_bytes_in_prefix;
if ((ip_number[i] & mask) != (ip_prefix[i] & mask))
return false;
}
return true;
}
} // namespace
const FormatUrlType kFormatUrlOmitNothing = 0;
const FormatUrlType kFormatUrlOmitUsernamePassword = 1 << 0;
const FormatUrlType kFormatUrlOmitHTTP = 1 << 1;
const FormatUrlType kFormatUrlOmitTrailingSlashOnBareHostname = 1 << 2;
const FormatUrlType kFormatUrlOmitAll = kFormatUrlOmitUsernamePassword |
kFormatUrlOmitHTTP | kFormatUrlOmitTrailingSlashOnBareHostname;
static base::LazyInstance<std::multiset<int> >::Leaky
g_explicitly_allowed_ports = LAZY_INSTANCE_INITIALIZER;
size_t GetCountOfExplicitlyAllowedPorts() {
return g_explicitly_allowed_ports.Get().size();
}
GURL FilePathToFileURL(const base::FilePath& path) {
// Produce a URL like "file:///C:/foo" for a regular file, or
// "file://///server/path" for UNC. The URL canonicalizer will fix up the
// latter case to be the canonical UNC form: "file://server/path"
base::FilePath::StringType url_string(kFileURLPrefix);
url_string.append(path.value());
// Now do replacement of some characters. Since we assume the input is a
// literal filename, anything the URL parser might consider special should
// be escaped here.
// must be the first substitution since others will introduce percents as the
// escape character
ReplaceSubstringsAfterOffset(&url_string, 0,
FILE_PATH_LITERAL("%"), FILE_PATH_LITERAL("%25"));
// semicolon is supposed to be some kind of separator according to RFC 2396
ReplaceSubstringsAfterOffset(&url_string, 0,
FILE_PATH_LITERAL(";"), FILE_PATH_LITERAL("%3B"));
ReplaceSubstringsAfterOffset(&url_string, 0,
FILE_PATH_LITERAL("#"), FILE_PATH_LITERAL("%23"));
ReplaceSubstringsAfterOffset(&url_string, 0,
FILE_PATH_LITERAL("?"), FILE_PATH_LITERAL("%3F"));
#if defined(OS_POSIX)
ReplaceSubstringsAfterOffset(&url_string, 0,
FILE_PATH_LITERAL("\\"), FILE_PATH_LITERAL("%5C"));
#endif
return GURL(url_string);
}
std::string GetSpecificHeader(const std::string& headers,
const std::string& name) {
// We want to grab the Value from the "Key: Value" pairs in the headers,
// which should look like this (no leading spaces, \n-separated) (we format
// them this way in url_request_inet.cc):
// HTTP/1.1 200 OK\n
// ETag: "6d0b8-947-24f35ec0"\n
// Content-Length: 2375\n
// Content-Type: text/html; charset=UTF-8\n
// Last-Modified: Sun, 03 Sep 2006 04:34:43 GMT\n
if (headers.empty())
return std::string();
std::string match('\n' + name + ':');
std::string::const_iterator begin =
std::search(headers.begin(), headers.end(), match.begin(), match.end(),
base::CaseInsensitiveCompareASCII<char>());
if (begin == headers.end())
return std::string();
begin += match.length();
std::string ret;
TrimWhitespace(std::string(begin, std::find(begin, headers.end(), '\n')),
TRIM_ALL, &ret);
return ret;
}
base::string16 IDNToUnicode(const std::string& host,
const std::string& languages) {
return IDNToUnicodeWithOffsets(host, languages, NULL);
}
std::string CanonicalizeHost(const std::string& host,
url_canon::CanonHostInfo* host_info) {
// Try to canonicalize the host.
const url_parse::Component raw_host_component(
0, static_cast<int>(host.length()));
std::string canon_host;
url_canon::StdStringCanonOutput canon_host_output(&canon_host);
url_canon::CanonicalizeHostVerbose(host.c_str(), raw_host_component,
&canon_host_output, host_info);
if (host_info->out_host.is_nonempty() &&
host_info->family != url_canon::CanonHostInfo::BROKEN) {
// Success! Assert that there's no extra garbage.
canon_host_output.Complete();
DCHECK_EQ(host_info->out_host.len, static_cast<int>(canon_host.length()));
} else {
// Empty host, or canonicalization failed. We'll return empty.
canon_host.clear();
}
return canon_host;
}
std::string GetDirectoryListingHeader(const base::string16& title) {
static const base::StringPiece header(
NetModule::GetResource(IDR_DIR_HEADER_HTML));
// This can be null in unit tests.
DLOG_IF(WARNING, header.empty()) <<
"Missing resource: directory listing header";
std::string result;
if (!header.empty())
result.assign(header.data(), header.size());
result.append("<script>start(");
base::JsonDoubleQuote(title, true, &result);
result.append(");</script>\n");
return result;
}
inline bool IsHostCharAlphanumeric(char c) {
// We can just check lowercase because uppercase characters have already been
// normalized.
return ((c >= 'a') && (c <= 'z')) || ((c >= '0') && (c <= '9'));
}
bool IsCanonicalizedHostCompliant(const std::string& host,
const std::string& desired_tld) {
if (host.empty())
return false;
bool in_component = false;
bool most_recent_component_started_alphanumeric = false;
bool last_char_was_underscore = false;
for (std::string::const_iterator i(host.begin()); i != host.end(); ++i) {
const char c = *i;
if (!in_component) {
most_recent_component_started_alphanumeric = IsHostCharAlphanumeric(c);
if (!most_recent_component_started_alphanumeric && (c != '-'))
return false;
in_component = true;
} else {
if (c == '.') {
if (last_char_was_underscore)
return false;
in_component = false;
} else if (IsHostCharAlphanumeric(c) || (c == '-')) {
last_char_was_underscore = false;
} else if (c == '_') {
last_char_was_underscore = true;
} else {
return false;
}
}
}
return most_recent_component_started_alphanumeric ||
(!desired_tld.empty() && IsHostCharAlphanumeric(desired_tld[0]));
}
std::string GetDirectoryListingEntry(const base::string16& name,
const std::string& raw_bytes,
bool is_dir,
int64 size,
Time modified) {
std::string result;
result.append("<script>addRow(");
base::JsonDoubleQuote(name, true, &result);
result.append(",");
if (raw_bytes.empty()) {
base::JsonDoubleQuote(EscapePath(UTF16ToUTF8(name)),
true, &result);
} else {
base::JsonDoubleQuote(EscapePath(raw_bytes), true, &result);
}
if (is_dir) {
result.append(",1,");
} else {
result.append(",0,");
}
// Negative size means unknown or not applicable (e.g. directory).
base::string16 size_string;
if (size >= 0)
size_string = FormatBytesUnlocalized(size);
base::JsonDoubleQuote(size_string, true, &result);
result.append(",");
base::string16 modified_str;
// |modified| can be NULL in FTP listings.
if (!modified.is_null()) {
modified_str = base::TimeFormatShortDateAndTime(modified);
}
base::JsonDoubleQuote(modified_str, true, &result);
result.append(");</script>\n");
return result;
}
base::string16 StripWWW(const base::string16& text) {
const base::string16 www(ASCIIToUTF16("www."));
return StartsWith(text, www, true) ? text.substr(www.length()) : text;
}
base::string16 StripWWWFromHost(const GURL& url) {
DCHECK(url.is_valid());
return StripWWW(ASCIIToUTF16(url.host()));
}
bool IsSafePortablePathComponent(const base::FilePath& component) {
base::string16 component16;
base::FilePath::StringType sanitized = component.value();
SanitizeGeneratedFileName(&sanitized, true);
base::FilePath::StringType extension = component.Extension();
if (!extension.empty())
extension.erase(extension.begin()); // Erase preceding '.'.
return !component.empty() &&
(component == component.BaseName()) &&
(component == component.StripTrailingSeparators()) &&
FilePathToString16(component, &component16) &&
file_util::IsFilenameLegal(component16) &&
!IsShellIntegratedExtension(extension) &&
(sanitized == component.value()) &&
!IsReservedName(component.value());
}
bool IsSafePortableRelativePath(const base::FilePath& path) {
if (path.empty() || path.IsAbsolute() || path.EndsWithSeparator())
return false;
std::vector<base::FilePath::StringType> components;
path.GetComponents(&components);
if (components.empty())
return false;
for (size_t i = 0; i < components.size() - 1; ++i) {
if (!IsSafePortablePathComponent(base::FilePath(components[i])))
return false;
}
return IsSafePortablePathComponent(path.BaseName());
}
void GenerateSafeFileName(const std::string& mime_type,
bool ignore_extension,
base::FilePath* file_path) {
// Make sure we get the right file extension
EnsureSafeExtension(mime_type, ignore_extension, file_path);
#if defined(OS_WIN)
// Prepend "_" to the file name if it's a reserved name
base::FilePath::StringType leaf_name = file_path->BaseName().value();
DCHECK(!leaf_name.empty());
if (IsReservedName(leaf_name)) {
leaf_name = base::FilePath::StringType(FILE_PATH_LITERAL("_")) + leaf_name;
*file_path = file_path->DirName();
if (file_path->value() == base::FilePath::kCurrentDirectory) {
*file_path = base::FilePath(leaf_name);
} else {
*file_path = file_path->Append(leaf_name);
}
}
#endif
}
base::string16 GetSuggestedFilename(const GURL& url,
const std::string& content_disposition,
const std::string& referrer_charset,
const std::string& suggested_name,
const std::string& mime_type,
const std::string& default_name) {
// TODO: this function to be updated to match the httpbis recommendations.
// Talk to abarth for the latest news.
// We don't translate this fallback string, "download". If localization is
// needed, the caller should provide localized fallback in |default_name|.
static const base::FilePath::CharType kFinalFallbackName[] =
FILE_PATH_LITERAL("download");
std::string filename; // In UTF-8
bool overwrite_extension = false;
// Try to extract a filename from content-disposition first.
if (!content_disposition.empty()) {
HttpContentDisposition header(content_disposition, referrer_charset);
filename = header.filename();
}
// Then try to use the suggested name.
if (filename.empty() && !suggested_name.empty())
filename = suggested_name;
// Now try extracting the filename from the URL. GetFileNameFromURL() only
// looks at the last component of the URL and doesn't return the hostname as a
// failover.
if (filename.empty())
filename = GetFileNameFromURL(url, referrer_charset, &overwrite_extension);
// Finally try the URL hostname, but only if there's no default specified in
// |default_name|. Some schemes (e.g.: file:, about:, data:) do not have a
// host name.
if (filename.empty() &&
default_name.empty() &&
url.is_valid() &&
!url.host().empty()) {
// TODO(jungshik) : Decode a 'punycoded' IDN hostname. (bug 1264451)
filename = url.host();
}
bool replace_trailing = false;
base::FilePath::StringType result_str, default_name_str;
#if defined(OS_WIN)
replace_trailing = true;
result_str = UTF8ToUTF16(filename);
default_name_str = UTF8ToUTF16(default_name);
#else
result_str = filename;
default_name_str = default_name;
#endif
SanitizeGeneratedFileName(&result_str, replace_trailing);
if (result_str.find_last_not_of(FILE_PATH_LITERAL("-_")) ==
base::FilePath::StringType::npos) {
result_str = !default_name_str.empty() ? default_name_str :
base::FilePath::StringType(kFinalFallbackName);
overwrite_extension = false;
}
file_util::ReplaceIllegalCharactersInPath(&result_str, '-');
base::FilePath result(result_str);
GenerateSafeFileName(mime_type, overwrite_extension, &result);
base::string16 result16;
if (!FilePathToString16(result, &result16)) {
result = base::FilePath(default_name_str);
if (!FilePathToString16(result, &result16)) {
result = base::FilePath(kFinalFallbackName);
FilePathToString16(result, &result16);
}
}
return result16;
}
base::FilePath GenerateFileName(const GURL& url,
const std::string& content_disposition,
const std::string& referrer_charset,
const std::string& suggested_name,
const std::string& mime_type,
const std::string& default_file_name) {
base::string16 file_name = GetSuggestedFilename(url,
content_disposition,
referrer_charset,
suggested_name,
mime_type,
default_file_name);
#if defined(OS_WIN)
base::FilePath generated_name(file_name);
#else
base::FilePath generated_name(
base::SysWideToNativeMB(UTF16ToWide(file_name)));
#endif
#if defined(OS_CHROMEOS)
// When doing file manager operations on ChromeOS, the file paths get
// normalized in WebKit layer, so let's ensure downloaded files have
// normalized names. Otherwise, we won't be able to handle files with NFD
// utf8 encoded characters in name.
file_util::NormalizeFileNameEncoding(&generated_name);
#endif
DCHECK(!generated_name.empty());
return generated_name;
}
bool IsPortAllowedByDefault(int port) {
int array_size = arraysize(kRestrictedPorts);
for (int i = 0; i < array_size; i++) {
if (kRestrictedPorts[i] == port) {
return false;
}
}
return true;
}
bool IsPortAllowedByFtp(int port) {
int array_size = arraysize(kAllowedFtpPorts);
for (int i = 0; i < array_size; i++) {
if (kAllowedFtpPorts[i] == port) {
return true;
}
}
// Port not explicitly allowed by FTP, so return the default restrictions.
return IsPortAllowedByDefault(port);
}
bool IsPortAllowedByOverride(int port) {
if (g_explicitly_allowed_ports.Get().empty())
return false;
return g_explicitly_allowed_ports.Get().count(port) > 0;
}
int SetNonBlocking(int fd) {
#if defined(OS_WIN)
unsigned long no_block = 1;
return ioctlsocket(fd, FIONBIO, &no_block);
#elif defined(OS_POSIX)
int flags = fcntl(fd, F_GETFL, 0);
if (-1 == flags)
return flags;
return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
#endif
}
bool ParseHostAndPort(std::string::const_iterator host_and_port_begin,
std::string::const_iterator host_and_port_end,
std::string* host,
int* port) {
if (host_and_port_begin >= host_and_port_end)
return false;
// When using url_parse, we use char*.
const char* auth_begin = &(*host_and_port_begin);
int auth_len = host_and_port_end - host_and_port_begin;
url_parse::Component auth_component(0, auth_len);
url_parse::Component username_component;
url_parse::Component password_component;
url_parse::Component hostname_component;
url_parse::Component port_component;
url_parse::ParseAuthority(auth_begin, auth_component, &username_component,
&password_component, &hostname_component, &port_component);
// There shouldn't be a username/password.
if (username_component.is_valid() || password_component.is_valid())
return false;
if (!hostname_component.is_nonempty())
return false; // Failed parsing.
int parsed_port_number = -1;
if (port_component.is_nonempty()) {
parsed_port_number = url_parse::ParsePort(auth_begin, port_component);
// If parsing failed, port_number will be either PORT_INVALID or
// PORT_UNSPECIFIED, both of which are negative.
if (parsed_port_number < 0)
return false; // Failed parsing the port number.
}
if (port_component.len == 0)
return false; // Reject inputs like "foo:"
// Pass results back to caller.
host->assign(auth_begin + hostname_component.begin, hostname_component.len);
*port = parsed_port_number;
return true; // Success.
}
bool ParseHostAndPort(const std::string& host_and_port,
std::string* host,
int* port) {
return ParseHostAndPort(
host_and_port.begin(), host_and_port.end(), host, port);
}
std::string GetHostAndPort(const GURL& url) {
// For IPv6 literals, GURL::host() already includes the brackets so it is
// safe to just append a colon.
return base::StringPrintf("%s:%d", url.host().c_str(),
url.EffectiveIntPort());
}
std::string GetHostAndOptionalPort(const GURL& url) {
// For IPv6 literals, GURL::host() already includes the brackets
// so it is safe to just append a colon.
if (url.has_port())
return base::StringPrintf("%s:%s", url.host().c_str(), url.port().c_str());
return url.host();
}
bool IsHostnameNonUnique(const std::string& hostname) {
// CanonicalizeHost requires surrounding brackets to parse an IPv6 address.
const std::string host_or_ip = hostname.find(':') != std::string::npos ?
"[" + hostname + "]" : hostname;
url_canon::CanonHostInfo host_info;
std::string canonical_name = CanonicalizeHost(host_or_ip, &host_info);
// If canonicalization fails, then the input is truly malformed. However,
// to avoid mis-reporting bad inputs as "non-unique", treat them as unique.
if (canonical_name.empty())
return false;
// If |hostname| is an IP address, check to see if it's in an IANA-reserved
// range.
if (host_info.IsIPAddress()) {
IPAddressNumber host_addr;
if (!ParseIPLiteralToNumber(hostname.substr(host_info.out_host.begin,
host_info.out_host.len),
&host_addr)) {
return false;
}
switch (host_info.family) {
case url_canon::CanonHostInfo::IPV4:
case url_canon::CanonHostInfo::IPV6:
return IsIPAddressReserved(host_addr);
case url_canon::CanonHostInfo::NEUTRAL:
case url_canon::CanonHostInfo::BROKEN:
return false;
}
}
// Check for a registry controlled portion of |hostname|, ignoring private
// registries, as they already chain to ICANN-administered registries,
// and explicitly ignoring unknown registries.
//
// Note: This means that as new gTLDs are introduced on the Internet, they
// will be treated as non-unique until the registry controlled domain list
// is updated. However, because gTLDs are expected to provide significant
// advance notice to deprecate older versions of this code, this an
// acceptable tradeoff.
return 0 == registry_controlled_domains::GetRegistryLength(
canonical_name,
registry_controlled_domains::EXCLUDE_UNKNOWN_REGISTRIES,
registry_controlled_domains::EXCLUDE_PRIVATE_REGISTRIES);
}
// Don't compare IPv4 and IPv6 addresses (they have different range
// reservations). Keep separate reservation arrays for each IP type, and
// consolidate adjacent reserved ranges within a reservation array when
// possible.
// Sources for info:
// www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xhtml
// www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml
// They're formatted here with the prefix as the last element. For example:
// 10.0.0.0/8 becomes 10,0,0,0,8 and fec0::/10 becomes 0xfe,0xc0,0,0,0...,10.
bool IsIPAddressReserved(const IPAddressNumber& host_addr) {
static const unsigned char kReservedIPv4[][5] = {
{ 0,0,0,0,8 }, { 10,0,0,0,8 }, { 100,64,0,0,10 }, { 127,0,0,0,8 },
{ 169,254,0,0,16 }, { 172,16,0,0,12 }, { 192,0,2,0,24 },
{ 192,88,99,0,24 }, { 192,168,0,0,16 }, { 198,18,0,0,15 },
{ 198,51,100,0,24 }, { 203,0,113,0,24 }, { 224,0,0,0,3 }
};
static const unsigned char kReservedIPv6[][17] = {
{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,8 },
{ 0x40,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2 },
{ 0x80,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2 },
{ 0xc0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3 },
{ 0xe0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4 },
{ 0xf0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5 },
{ 0xf8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6 },
{ 0xfc,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7 },
{ 0xfe,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,9 },
{ 0xfe,0x80,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10 },
{ 0xfe,0xc0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10 },
};
size_t array_size = 0;
const unsigned char* array = NULL;
switch (host_addr.size()) {
case kIPv4AddressSize:
array_size = arraysize(kReservedIPv4);
array = kReservedIPv4[0];
break;
case kIPv6AddressSize:
array_size = arraysize(kReservedIPv6);
array = kReservedIPv6[0];
break;
}
if (!array)
return false;
size_t width = host_addr.size() + 1;
for (size_t i = 0; i < array_size; ++i, array += width) {
if (IPNumberPrefixCheck(host_addr, array, array[width-1]))
return true;
}
return false;
}
// Extracts the address and port portions of a sockaddr.
bool GetIPAddressFromSockAddr(const struct sockaddr* sock_addr,
socklen_t sock_addr_len,
const uint8** address,
size_t* address_len,
uint16* port) {
if (sock_addr->sa_family == AF_INET) {
if (sock_addr_len < static_cast<socklen_t>(sizeof(struct sockaddr_in)))
return false;
const struct sockaddr_in* addr =
reinterpret_cast<const struct sockaddr_in*>(sock_addr);
*address = reinterpret_cast<const uint8*>(&addr->sin_addr);
*address_len = kIPv4AddressSize;
if (port)
*port = base::NetToHost16(addr->sin_port);
return true;
}
if (sock_addr->sa_family == AF_INET6) {
if (sock_addr_len < static_cast<socklen_t>(sizeof(struct sockaddr_in6)))
return false;
const struct sockaddr_in6* addr =
reinterpret_cast<const struct sockaddr_in6*>(sock_addr);
*address = reinterpret_cast<const unsigned char*>(&addr->sin6_addr);
*address_len = kIPv6AddressSize;
if (port)
*port = base::NetToHost16(addr->sin6_port);
return true;
}
return false; // Unrecognized |sa_family|.
}
std::string IPAddressToString(const uint8* address,
size_t address_len) {
std::string str;
url_canon::StdStringCanonOutput output(&str);
if (address_len == kIPv4AddressSize) {
url_canon::AppendIPv4Address(address, &output);
} else if (address_len == kIPv6AddressSize) {
url_canon::AppendIPv6Address(address, &output);
} else {
CHECK(false) << "Invalid IP address with length: " << address_len;
}
output.Complete();
return str;
}
std::string IPAddressToStringWithPort(const uint8* address,
size_t address_len,
uint16 port) {
std::string address_str = IPAddressToString(address, address_len);
if (address_len == kIPv6AddressSize) {
// Need to bracket IPv6 addresses since they contain colons.
return base::StringPrintf("[%s]:%d", address_str.c_str(), port);
}
return base::StringPrintf("%s:%d", address_str.c_str(), port);
}
std::string NetAddressToString(const struct sockaddr* sa,
socklen_t sock_addr_len) {
const uint8* address;
size_t address_len;
if (!GetIPAddressFromSockAddr(sa, sock_addr_len, &address,
&address_len, NULL)) {
NOTREACHED();
return std::string();
}
return IPAddressToString(address, address_len);
}
std::string NetAddressToStringWithPort(const struct sockaddr* sa,
socklen_t sock_addr_len) {
const uint8* address;
size_t address_len;
uint16 port;
if (!GetIPAddressFromSockAddr(sa, sock_addr_len, &address,
&address_len, &port)) {
NOTREACHED();
return std::string();
}
return IPAddressToStringWithPort(address, address_len, port);
}
std::string IPAddressToString(const IPAddressNumber& addr) {
return IPAddressToString(&addr.front(), addr.size());
}
std::string IPAddressToStringWithPort(const IPAddressNumber& addr,
uint16 port) {
return IPAddressToStringWithPort(&addr.front(), addr.size(), port);
}
std::string IPAddressToPackedString(const IPAddressNumber& addr) {
return std::string(reinterpret_cast<const char *>(&addr.front()),
addr.size());
}
std::string GetHostName() {
#if defined(OS_WIN)
EnsureWinsockInit();
#endif
// Host names are limited to 255 bytes.
char buffer[256];
int result = gethostname(buffer, sizeof(buffer));
if (result != 0) {
DVLOG(1) << "gethostname() failed with " << result;
buffer[0] = '\0';
}
return std::string(buffer);
}
void GetIdentityFromURL(const GURL& url,
base::string16* username,
base::string16* password) {
UnescapeRule::Type flags =
UnescapeRule::SPACES | UnescapeRule::URL_SPECIAL_CHARS;
*username = UnescapeAndDecodeUTF8URLComponent(url.username(), flags, NULL);
*password = UnescapeAndDecodeUTF8URLComponent(url.password(), flags, NULL);
}
std::string GetHostOrSpecFromURL(const GURL& url) {
return url.has_host() ? TrimEndingDot(url.host()) : url.spec();
}
void AppendFormattedHost(const GURL& url,
const std::string& languages,
base::string16* output) {
Offsets offsets;
AppendFormattedComponent(url.possibly_invalid_spec(),
url.parsed_for_possibly_invalid_spec().host, offsets,
HostComponentTransform(languages), output, NULL, NULL);
}
base::string16 FormatUrlWithOffsets(
const GURL& url,
const std::string& languages,
FormatUrlTypes format_types,
UnescapeRule::Type unescape_rules,
url_parse::Parsed* new_parsed,
size_t* prefix_end,
Offsets* offsets_for_adjustment) {
url_parse::Parsed parsed_temp;
if (!new_parsed)
new_parsed = &parsed_temp;
else
*new_parsed = url_parse::Parsed();
Offsets original_offsets;
if (offsets_for_adjustment)
original_offsets = *offsets_for_adjustment;
// Special handling for view-source:. Don't use content::kViewSourceScheme
// because this library shouldn't depend on chrome.
const char* const kViewSource = "view-source";
// Reject "view-source:view-source:..." to avoid deep recursion.
const char* const kViewSourceTwice = "view-source:view-source:";
if (url.SchemeIs(kViewSource) &&
!StartsWithASCII(url.possibly_invalid_spec(), kViewSourceTwice, false)) {
return FormatViewSourceUrl(url, original_offsets, languages, format_types,
unescape_rules, new_parsed, prefix_end,
offsets_for_adjustment);
}
// We handle both valid and invalid URLs (this will give us the spec
// regardless of validity).
const std::string& spec = url.possibly_invalid_spec();
const url_parse::Parsed& parsed = url.parsed_for_possibly_invalid_spec();
// Scheme & separators. These are ASCII.
base::string16 url_string;
url_string.insert(url_string.end(), spec.begin(),
spec.begin() + parsed.CountCharactersBefore(url_parse::Parsed::USERNAME,
true));
const char kHTTP[] = "http://";
const char kFTP[] = "ftp.";
// URLFixerUpper::FixupURL() treats "ftp.foo.com" as ftp://ftp.foo.com. This
// means that if we trim "http://" off a URL whose host starts with "ftp." and
// the user inputs this into any field subject to fixup (which is basically
// all input fields), the meaning would be changed. (In fact, often the
// formatted URL is directly pre-filled into an input field.) For this reason
// we avoid stripping "http://" in this case.
bool omit_http = (format_types & kFormatUrlOmitHTTP) &&
EqualsASCII(url_string, kHTTP) &&
!StartsWithASCII(url.host(), kFTP, true);
new_parsed->scheme = parsed.scheme;
// Username & password.
if ((format_types & kFormatUrlOmitUsernamePassword) != 0) {
// Remove the username and password fields. We don't want to display those
// to the user since they can be used for attacks,
// e.g. "http://google.com:search@evil.ru/"
new_parsed->username.reset();
new_parsed->password.reset();
// Update the offsets based on removed username and/or password.
if (offsets_for_adjustment && !offsets_for_adjustment->empty() &&
(parsed.username.is_nonempty() || parsed.password.is_nonempty())) {
base::OffsetAdjuster offset_adjuster(offsets_for_adjustment);
if (parsed.username.is_nonempty() && parsed.password.is_nonempty()) {
// The seeming off-by-one and off-by-two in these first two lines are to
// account for the ':' after the username and '@' after the password.
offset_adjuster.Add(base::OffsetAdjuster::Adjustment(
static_cast<size_t>(parsed.username.begin),
static_cast<size_t>(parsed.username.len + parsed.password.len + 2),
0));
} else {
const url_parse::Component* nonempty_component =
parsed.username.is_nonempty() ? &parsed.username : &parsed.password;
// The seeming off-by-one in below is to account for the '@' after the
// username/password.
offset_adjuster.Add(base::OffsetAdjuster::Adjustment(
static_cast<size_t>(nonempty_component->begin),
static_cast<size_t>(nonempty_component->len + 1), 0));
}
}
} else {
AppendFormattedComponent(spec, parsed.username, original_offsets,
NonHostComponentTransform(unescape_rules), &url_string,
&new_parsed->username, offsets_for_adjustment);
if (parsed.password.is_valid())
url_string.push_back(':');
AppendFormattedComponent(spec, parsed.password, original_offsets,
NonHostComponentTransform(unescape_rules), &url_string,
&new_parsed->password, offsets_for_adjustment);
if (parsed.username.is_valid() || parsed.password.is_valid())
url_string.push_back('@');
}
if (prefix_end)
*prefix_end = static_cast<size_t>(url_string.length());
// Host.
AppendFormattedComponent(spec, parsed.host, original_offsets,
HostComponentTransform(languages), &url_string, &new_parsed->host,
offsets_for_adjustment);
// Port.
if (parsed.port.is_nonempty()) {
url_string.push_back(':');
new_parsed->port.begin = url_string.length();
url_string.insert(url_string.end(),
spec.begin() + parsed.port.begin,
spec.begin() + parsed.port.end());
new_parsed->port.len = url_string.length() - new_parsed->port.begin;
} else {
new_parsed->port.reset();
}
// Path & query. Both get the same general unescape & convert treatment.
if (!(format_types & kFormatUrlOmitTrailingSlashOnBareHostname) ||
!CanStripTrailingSlash(url)) {
AppendFormattedComponent(spec, parsed.path, original_offsets,
NonHostComponentTransform(unescape_rules), &url_string,
&new_parsed->path, offsets_for_adjustment);
} else {
base::OffsetAdjuster offset_adjuster(offsets_for_adjustment);
offset_adjuster.Add(base::OffsetAdjuster::Adjustment(
url_string.length(), parsed.path.len, 0));
}
if (parsed.query.is_valid())
url_string.push_back('?');
AppendFormattedComponent(spec, parsed.query, original_offsets,
NonHostComponentTransform(unescape_rules), &url_string,
&new_parsed->query, offsets_for_adjustment);
// Ref. This is valid, unescaped UTF-8, so we can just convert.
if (parsed.ref.is_valid())
url_string.push_back('#');
AppendFormattedComponent(spec, parsed.ref, original_offsets,
NonHostComponentTransform(UnescapeRule::NONE), &url_string,
&new_parsed->ref, offsets_for_adjustment);
// If we need to strip out http do it after the fact. This way we don't need
// to worry about how offset_for_adjustment is interpreted.
if (omit_http && StartsWith(url_string, ASCIIToUTF16(kHTTP), true)) {
const size_t kHTTPSize = arraysize(kHTTP) - 1;
url_string = url_string.substr(kHTTPSize);
if (offsets_for_adjustment && !offsets_for_adjustment->empty()) {
base::OffsetAdjuster offset_adjuster(offsets_for_adjustment);
offset_adjuster.Add(base::OffsetAdjuster::Adjustment(0, kHTTPSize, 0));
}
if (prefix_end)
*prefix_end -= kHTTPSize;
// Adjust new_parsed.
DCHECK(new_parsed->scheme.is_valid());
int delta = -(new_parsed->scheme.len + 3); // +3 for ://.
new_parsed->scheme.reset();
AdjustAllComponentsButScheme(delta, new_parsed);
}
LimitOffsets(url_string, offsets_for_adjustment);
return url_string;
}
base::string16 FormatUrl(const GURL& url,
const std::string& languages,
FormatUrlTypes format_types,
UnescapeRule::Type unescape_rules,
url_parse::Parsed* new_parsed,
size_t* prefix_end,
size_t* offset_for_adjustment) {
Offsets offsets;
if (offset_for_adjustment)
offsets.push_back(*offset_for_adjustment);
base::string16 result = FormatUrlWithOffsets(url, languages, format_types,
unescape_rules, new_parsed, prefix_end, &offsets);
if (offset_for_adjustment)
*offset_for_adjustment = offsets[0];
return result;
}
bool CanStripTrailingSlash(const GURL& url) {
// Omit the path only for standard, non-file URLs with nothing but "/" after
// the hostname.
return url.IsStandard() && !url.SchemeIsFile() &&
!url.SchemeIsFileSystem() && !url.has_query() && !url.has_ref()
&& url.path() == "/";
}
GURL SimplifyUrlForRequest(const GURL& url) {
DCHECK(url.is_valid());
GURL::Replacements replacements;
replacements.ClearUsername();
replacements.ClearPassword();
replacements.ClearRef();
return url.ReplaceComponents(replacements);
}
// Specifies a comma separated list of port numbers that should be accepted
// despite bans. If the string is invalid no allowed ports are stored.
void SetExplicitlyAllowedPorts(const std::string& allowed_ports) {
if (allowed_ports.empty())
return;
std::multiset<int> ports;
size_t last = 0;
size_t size = allowed_ports.size();
// The comma delimiter.
const std::string::value_type kComma = ',';
// Overflow is still possible for evil user inputs.
for (size_t i = 0; i <= size; ++i) {
// The string should be composed of only digits and commas.
if (i != size && !IsAsciiDigit(allowed_ports[i]) &&
(allowed_ports[i] != kComma))
return;
if (i == size || allowed_ports[i] == kComma) {
if (i > last) {
int port;
base::StringToInt(base::StringPiece(allowed_ports.begin() + last,
allowed_ports.begin() + i),
&port);
ports.insert(port);
}
last = i + 1;
}
}
g_explicitly_allowed_ports.Get() = ports;
}
ScopedPortException::ScopedPortException(int port) : port_(port) {
g_explicitly_allowed_ports.Get().insert(port);
}
ScopedPortException::~ScopedPortException() {
std::multiset<int>::iterator it =
g_explicitly_allowed_ports.Get().find(port_);
if (it != g_explicitly_allowed_ports.Get().end())
g_explicitly_allowed_ports.Get().erase(it);
else
NOTREACHED();
}
bool HaveOnlyLoopbackAddresses() {
#if defined(OS_ANDROID)
return android::HaveOnlyLoopbackAddresses();
#elif defined(OS_POSIX)
struct ifaddrs* interface_addr = NULL;
int rv = getifaddrs(&interface_addr);
if (rv != 0) {
DVLOG(1) << "getifaddrs() failed with errno = " << errno;
return false;
}
bool result = true;
for (struct ifaddrs* interface = interface_addr;
interface != NULL;
interface = interface->ifa_next) {
if (!(IFF_UP & interface->ifa_flags))
continue;
if (IFF_LOOPBACK & interface->ifa_flags)
continue;
const struct sockaddr* addr = interface->ifa_addr;
if (!addr)
continue;
if (addr->sa_family == AF_INET6) {
// Safe cast since this is AF_INET6.
const struct sockaddr_in6* addr_in6 =
reinterpret_cast<const struct sockaddr_in6*>(addr);
const struct in6_addr* sin6_addr = &addr_in6->sin6_addr;
if (IN6_IS_ADDR_LOOPBACK(sin6_addr) || IN6_IS_ADDR_LINKLOCAL(sin6_addr))
continue;
}
if (addr->sa_family != AF_INET6 && addr->sa_family != AF_INET)
continue;
result = false;
break;
}
freeifaddrs(interface_addr);
return result;
#elif defined(OS_WIN)
// TODO(wtc): implement with the GetAdaptersAddresses function.
NOTIMPLEMENTED();
return false;
#else
NOTIMPLEMENTED();
return false;
#endif // defined(various platforms)
}
AddressFamily GetAddressFamily(const IPAddressNumber& address) {
switch (address.size()) {
case kIPv4AddressSize:
return ADDRESS_FAMILY_IPV4;
case kIPv6AddressSize:
return ADDRESS_FAMILY_IPV6;
default:
return ADDRESS_FAMILY_UNSPECIFIED;
}
}
int ConvertAddressFamily(AddressFamily address_family) {
switch (address_family) {
case ADDRESS_FAMILY_UNSPECIFIED:
return AF_UNSPEC;
case ADDRESS_FAMILY_IPV4:
return AF_INET;
case ADDRESS_FAMILY_IPV6:
return AF_INET6;
}
NOTREACHED();
return AF_UNSPEC;
}
bool ParseIPLiteralToNumber(const std::string& ip_literal,
IPAddressNumber* ip_number) {
// |ip_literal| could be either a IPv4 or an IPv6 literal. If it contains
// a colon however, it must be an IPv6 address.
if (ip_literal.find(':') != std::string::npos) {
// GURL expects IPv6 hostnames to be surrounded with brackets.
std::string host_brackets = "[" + ip_literal + "]";
url_parse::Component host_comp(0, host_brackets.size());
// Try parsing the hostname as an IPv6 literal.
ip_number->resize(16); // 128 bits.
return url_canon::IPv6AddressToNumber(host_brackets.data(),
host_comp,
&(*ip_number)[0]);
}
// Otherwise the string is an IPv4 address.
ip_number->resize(4); // 32 bits.
url_parse::Component host_comp(0, ip_literal.size());
int num_components;
url_canon::CanonHostInfo::Family family = url_canon::IPv4AddressToNumber(
ip_literal.data(), host_comp, &(*ip_number)[0], &num_components);
return family == url_canon::CanonHostInfo::IPV4;
}
namespace {
const unsigned char kIPv4MappedPrefix[] =
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF };
}
IPAddressNumber ConvertIPv4NumberToIPv6Number(
const IPAddressNumber& ipv4_number) {
DCHECK(ipv4_number.size() == 4);
// IPv4-mapped addresses are formed by:
// <80 bits of zeros> + <16 bits of ones> + <32-bit IPv4 address>.
IPAddressNumber ipv6_number;
ipv6_number.reserve(16);
ipv6_number.insert(ipv6_number.end(),
kIPv4MappedPrefix,
kIPv4MappedPrefix + arraysize(kIPv4MappedPrefix));
ipv6_number.insert(ipv6_number.end(), ipv4_number.begin(), ipv4_number.end());
return ipv6_number;
}
bool IsIPv4Mapped(const IPAddressNumber& address) {
if (address.size() != kIPv6AddressSize)
return false;
return std::equal(address.begin(),
address.begin() + arraysize(kIPv4MappedPrefix),
kIPv4MappedPrefix);
}
IPAddressNumber ConvertIPv4MappedToIPv4(const IPAddressNumber& address) {
DCHECK(IsIPv4Mapped(address));
return IPAddressNumber(address.begin() + arraysize(kIPv4MappedPrefix),
address.end());
}
bool ParseCIDRBlock(const std::string& cidr_literal,
IPAddressNumber* ip_number,
size_t* prefix_length_in_bits) {
// We expect CIDR notation to match one of these two templates:
// <IPv4-literal> "/" <number of bits>
// <IPv6-literal> "/" <number of bits>
std::vector<std::string> parts;
base::SplitString(cidr_literal, '/', &parts);
if (parts.size() != 2)
return false;
// Parse the IP address.
if (!ParseIPLiteralToNumber(parts[0], ip_number))
return false;
// Parse the prefix length.
int number_of_bits = -1;
if (!base::StringToInt(parts[1], &number_of_bits))
return false;
// Make sure the prefix length is in a valid range.
if (number_of_bits < 0 ||
number_of_bits > static_cast<int>(ip_number->size() * 8))
return false;
*prefix_length_in_bits = static_cast<size_t>(number_of_bits);
return true;
}
bool IPNumberMatchesPrefix(const IPAddressNumber& ip_number,
const IPAddressNumber& ip_prefix,
size_t prefix_length_in_bits) {
// Both the input IP address and the prefix IP address should be
// either IPv4 or IPv6.
DCHECK(ip_number.size() == 4 || ip_number.size() == 16);
DCHECK(ip_prefix.size() == 4 || ip_prefix.size() == 16);
DCHECK_LE(prefix_length_in_bits, ip_prefix.size() * 8);
// In case we have an IPv6 / IPv4 mismatch, convert the IPv4 addresses to
// IPv6 addresses in order to do the comparison.
if (ip_number.size() != ip_prefix.size()) {
if (ip_number.size() == 4) {
return IPNumberMatchesPrefix(ConvertIPv4NumberToIPv6Number(ip_number),
ip_prefix, prefix_length_in_bits);
}
return IPNumberMatchesPrefix(ip_number,
ConvertIPv4NumberToIPv6Number(ip_prefix),
96 + prefix_length_in_bits);
}
return IPNumberPrefixCheck(ip_number, &ip_prefix[0], prefix_length_in_bits);
}
const uint16* GetPortFieldFromSockaddr(const struct sockaddr* address,
socklen_t address_len) {
if (address->sa_family == AF_INET) {
DCHECK_LE(sizeof(sockaddr_in), static_cast<size_t>(address_len));
const struct sockaddr_in* sockaddr =
reinterpret_cast<const struct sockaddr_in*>(address);
return &sockaddr->sin_port;
} else if (address->sa_family == AF_INET6) {
DCHECK_LE(sizeof(sockaddr_in6), static_cast<size_t>(address_len));
const struct sockaddr_in6* sockaddr =
reinterpret_cast<const struct sockaddr_in6*>(address);
return &sockaddr->sin6_port;
} else {
NOTREACHED();
return NULL;
}
}
int GetPortFromSockaddr(const struct sockaddr* address, socklen_t address_len) {
const uint16* port_field = GetPortFieldFromSockaddr(address, address_len);
if (!port_field)
return -1;
return base::NetToHost16(*port_field);
}
bool IsLocalhost(const std::string& host) {
if (host == "localhost" ||
host == "localhost.localdomain" ||
host == "localhost6" ||
host == "localhost6.localdomain6")
return true;
IPAddressNumber ip_number;
if (ParseIPLiteralToNumber(host, &ip_number)) {
size_t size = ip_number.size();
switch (size) {
case kIPv4AddressSize: {
IPAddressNumber localhost_prefix;
localhost_prefix.push_back(127);
for (int i = 0; i < 3; ++i) {
localhost_prefix.push_back(0);
}
return IPNumberMatchesPrefix(ip_number, localhost_prefix, 8);
}
case kIPv6AddressSize: {
struct in6_addr sin6_addr;
memcpy(&sin6_addr, &ip_number[0], kIPv6AddressSize);
return !!IN6_IS_ADDR_LOOPBACK(&sin6_addr);
}
default:
NOTREACHED();
}
}
return false;
}
NetworkInterface::NetworkInterface() : network_prefix(0) {
}
NetworkInterface::NetworkInterface(const std::string& name,
const IPAddressNumber& address,
size_t network_prefix)
: name(name), address(address), network_prefix(network_prefix) {
}
NetworkInterface::~NetworkInterface() {
}
unsigned CommonPrefixLength(const IPAddressNumber& a1,
const IPAddressNumber& a2) {
DCHECK_EQ(a1.size(), a2.size());
for (size_t i = 0; i < a1.size(); ++i) {
unsigned diff = a1[i] ^ a2[i];
if (!diff)
continue;
for (unsigned j = 0; j < CHAR_BIT; ++j) {
if (diff & (1 << (CHAR_BIT - 1)))
return i * CHAR_BIT + j;
diff <<= 1;
}
NOTREACHED();
}
return a1.size() * CHAR_BIT;
}
unsigned MaskPrefixLength(const IPAddressNumber& mask) {
IPAddressNumber all_ones(mask.size(), 0xFF);
return CommonPrefixLength(mask, all_ones);
}
} // namespace net