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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 "build/build_config.h"
#if defined(OS_WIN)
#include <windows.h>
#include <ws2tcpip.h>
#elif defined(OS_POSIX)
#include <sys/types.h>
#include <sys/socket.h>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/strings/string16.h"
#include "base/strings/utf_offset_string_conversions.h"
#include "net/base/address_family.h"
#include "net/base/escape.h"
#include "net/base/net_export.h"
#include "net/base/network_change_notifier.h"
class GURL;
namespace base {
class Time;
namespace url {
struct CanonHostInfo;
struct Parsed;
namespace net {
// Used by FormatUrl to specify handling of certain parts of the url.
typedef uint32 FormatUrlType;
typedef uint32 FormatUrlTypes;
// IPAddressNumber is used to represent an IP address's numeric value as an
// array of bytes, from most significant to least significant. This is the
// network byte ordering.
// IPv4 addresses will have length 4, whereas IPv6 address will have length 16.
typedef std::vector<unsigned char> IPAddressNumber;
typedef std::vector<IPAddressNumber> IPAddressList;
static const size_t kIPv4AddressSize = 4;
static const size_t kIPv6AddressSize = 16;
#if defined(OS_WIN)
// Bluetooth address size. Windows Bluetooth is supported via winsock.
static const size_t kBluetoothAddressSize = 6;
// Nothing is ommitted.
NET_EXPORT extern const FormatUrlType kFormatUrlOmitNothing;
// If set, any username and password are removed.
NET_EXPORT extern const FormatUrlType kFormatUrlOmitUsernamePassword;
// If the scheme is 'http://', it's removed.
NET_EXPORT extern const FormatUrlType kFormatUrlOmitHTTP;
// Omits the path if it is just a slash and there is no query or ref. This is
// meaningful for non-file "standard" URLs.
NET_EXPORT extern const FormatUrlType kFormatUrlOmitTrailingSlashOnBareHostname;
// Convenience for omitting all unecessary types.
NET_EXPORT extern const FormatUrlType kFormatUrlOmitAll;
// Returns the number of explicitly allowed ports; for testing.
NET_EXPORT_PRIVATE extern size_t GetCountOfExplicitlyAllowedPorts();
// Splits an input of the form <host>[":"<port>] into its consitituent parts.
// Saves the result into |*host| and |*port|. If the input did not have
// the optional port, sets |*port| to -1.
// Returns true if the parsing was successful, false otherwise.
// The returned host is NOT canonicalized, and may be invalid. If <host> is
// an IPv6 literal address, the returned host includes the square brackets.
NET_EXPORT bool ParseHostAndPort(
std::string::const_iterator host_and_port_begin,
std::string::const_iterator host_and_port_end,
std::string* host,
int* port);
NET_EXPORT bool ParseHostAndPort(
const std::string& host_and_port,
std::string* host,
int* port);
// Returns a host:port string for the given URL.
NET_EXPORT std::string GetHostAndPort(const GURL& url);
// Returns a host[:port] string for the given URL, where the port is omitted
// if it is the default for the URL's scheme.
NET_EXPORT_PRIVATE std::string GetHostAndOptionalPort(const GURL& url);
// Returns true if |hostname| contains a non-registerable or non-assignable
// domain name (eg: a gTLD that has not been assigned by IANA) or an IP address
// that falls in an IANA-reserved range.
NET_EXPORT bool IsHostnameNonUnique(const std::string& hostname);
// Returns true if an IP address hostname is in a range reserved by the IANA.
// Works with both IPv4 and IPv6 addresses, and only compares against a given
// protocols's reserved ranges.
NET_EXPORT bool IsIPAddressReserved(const IPAddressNumber& address);
// Convenience struct for when you need a |struct sockaddr|.
struct SockaddrStorage {
SockaddrStorage() : addr_len(sizeof(addr_storage)),
addr(reinterpret_cast<struct sockaddr*>(&addr_storage)) {}
struct sockaddr_storage addr_storage;
socklen_t addr_len;
struct sockaddr* const addr;
// Extracts the IP address and port portions of a sockaddr. |port| is optional,
// and will not be filled in if NULL.
bool GetIPAddressFromSockAddr(const struct sockaddr* sock_addr,
socklen_t sock_addr_len,
const unsigned char** address,
size_t* address_len,
uint16* port);
// Returns the string representation of an IP address.
// For example: "" or "::1".
NET_EXPORT std::string IPAddressToString(const uint8* address,
size_t address_len);
// Returns the string representation of an IP address along with its port.
// For example: "" or "[::1]:80".
NET_EXPORT std::string IPAddressToStringWithPort(const uint8* address,
size_t address_len,
uint16 port);
// Same as IPAddressToString() but for a sockaddr. This output will not include
// the IPv6 scope ID.
NET_EXPORT std::string NetAddressToString(const struct sockaddr* sa,
socklen_t sock_addr_len);
// Same as IPAddressToStringWithPort() but for a sockaddr. This output will not
// include the IPv6 scope ID.
NET_EXPORT std::string NetAddressToStringWithPort(const struct sockaddr* sa,
socklen_t sock_addr_len);
// Same as IPAddressToString() but for an IPAddressNumber.
NET_EXPORT std::string IPAddressToString(const IPAddressNumber& addr);
// Same as IPAddressToStringWithPort() but for an IPAddressNumber.
NET_EXPORT std::string IPAddressToStringWithPort(
const IPAddressNumber& addr, uint16 port);
// Returns the address as a sequence of bytes in network-byte-order.
NET_EXPORT std::string IPAddressToPackedString(const IPAddressNumber& addr);
// Returns the hostname of the current system. Returns empty string on failure.
NET_EXPORT std::string GetHostName();
// Extracts the unescaped username/password from |url|, saving the results
// into |*username| and |*password|.
NET_EXPORT_PRIVATE void GetIdentityFromURL(const GURL& url,
base::string16* username,
base::string16* password);
// Returns either the host from |url|, or, if the host is empty, the full spec.
NET_EXPORT std::string GetHostOrSpecFromURL(const GURL& url);
// Return the value of the HTTP response header with name 'name'. 'headers'
// should be in the format that URLRequest::GetResponseHeaders() returns.
// Returns the empty string if the header is not found.
NET_EXPORT std::string GetSpecificHeader(const std::string& headers,
const std::string& name);
// Converts the given host name to unicode characters. This can be called for
// any host name, if the input is not IDN or is invalid in some way, we'll just
// return the ASCII source so it is still usable.
// The input should be the canonicalized ASCII host name from GURL. This
// function does NOT accept UTF-8!
// |languages| is a comma separated list of ISO 639 language codes. It
// is used to determine whether a hostname is 'comprehensible' to a user
// who understands languages listed. |host| will be converted to a
// human-readable form (Unicode) ONLY when each component of |host| is
// regarded as 'comprehensible'. Scipt-mixing is not allowed except that
// Latin letters in the ASCII range can be mixed with a limited set of
// script-language pairs (currently Han, Kana and Hangul for zh,ja and ko).
// When |languages| is empty, even that mixing is not allowed.
NET_EXPORT base::string16 IDNToUnicode(const std::string& host,
const std::string& languages);
// Canonicalizes |host| and returns it. Also fills |host_info| with
// IP address information. |host_info| must not be NULL.
NET_EXPORT std::string CanonicalizeHost(const std::string& host,
url::CanonHostInfo* host_info);
// Returns true if |host| is not an IP address and is compliant with a set of
// rules based on RFC 1738 and tweaked to be compatible with the real world.
// The rules are:
// * One or more components separated by '.'
// * Each component begins with an alphanumeric character or '-'
// * Each component contains only alphanumeric characters and '-' or '_'
// * Each component ends with an alphanumeric character or '-'
// * The last component begins with an alphanumeric character
// * Optional trailing dot after last component (means "treat as FQDN")
// If |desired_tld| is non-NULL, the host will only be considered invalid if
// appending it as a trailing component still results in an invalid host. This
// helps us avoid marking as "invalid" user attempts to open, say, ""
// by typing -, 9, <ctrl>+<enter>.
// NOTE: You should only pass in hosts that have been returned from
// CanonicalizeHost(), or you may not get accurate results.
NET_EXPORT bool IsCanonicalizedHostCompliant(const std::string& host,
const std::string& desired_tld);
// Call these functions to get the html snippet for a directory listing.
// The return values of both functions are in UTF-8.
NET_EXPORT std::string GetDirectoryListingHeader(const base::string16& title);
// Given the name of a file in a directory (ftp or local) and
// other information (is_dir, size, modification time), it returns
// the html snippet to add the entry for the file to the directory listing.
// Currently, it's a script tag containing a call to a Javascript function
// |addRow|.
// |name| is the file name to be displayed. |raw_bytes| will be used
// as the actual target of the link (so for example, ftp links should use
// server's encoding). If |raw_bytes| is an empty string, UTF-8 encoded |name|
// will be used.
// Both |name| and |raw_bytes| are escaped internally.
NET_EXPORT std::string GetDirectoryListingEntry(const base::string16& name,
const std::string& raw_bytes,
bool is_dir, int64 size,
base::Time modified);
// If text starts with "www." it is removed, otherwise text is returned
// unmodified.
NET_EXPORT base::string16 StripWWW(const base::string16& text);
// Runs |url|'s host through StripWWW(). |url| must be valid.
NET_EXPORT base::string16 StripWWWFromHost(const GURL& url);
// Checks |port| against a list of ports which are restricted by default.
// Returns true if |port| is allowed, false if it is restricted.
NET_EXPORT bool IsPortAllowedByDefault(int port);
// Checks |port| against a list of ports which are restricted by the FTP
// protocol. Returns true if |port| is allowed, false if it is restricted.
NET_EXPORT_PRIVATE bool IsPortAllowedByFtp(int port);
// Check if banned |port| has been overriden by an entry in
// |explicitly_allowed_ports_|.
NET_EXPORT_PRIVATE bool IsPortAllowedByOverride(int port);
// Set socket to non-blocking mode
NET_EXPORT int SetNonBlocking(int fd);
// Formats the host in |url| and appends it to |output|. The host formatter
// takes the same accept languages component as ElideURL().
NET_EXPORT void AppendFormattedHost(const GURL& url,
const std::string& languages,
base::string16* output);
// Creates a string representation of |url|. The IDN host name may be in Unicode
// if |languages| accepts the Unicode representation. |format_type| is a bitmask
// of FormatUrlTypes, see it for details. |unescape_rules| defines how to clean
// the URL for human readability. You will generally want |UnescapeRule::SPACES|
// for display to the user if you can handle spaces, or |UnescapeRule::NORMAL|
// if not. If the path part and the query part seem to be encoded in %-encoded
// UTF-8, decodes %-encoding and UTF-8.
// The last three parameters may be NULL.
// |new_parsed| will be set to the parsing parameters of the resultant URL.
// |prefix_end| will be the length before the hostname of the resultant URL.
// |offset[s]_for_adjustment| specifies one or more offsets into the original
// URL, representing insertion or selection points between characters: if the
// input is "", offset 0 is before the entire URL, offset 7 is
// between the scheme and the host, and offset 15 is after the end of the URL.
// Valid input offsets range from 0 to the length of the input URL string. On
// exit, each offset will have been modified to reflect any changes made to the
// output string. For example, if |url| is "",
// |omit_username_password| is true, and an offset is 12 (pointing between 'c'
// and '.'), then on return the output string will be "" and the
// offset will be 8. If an offset cannot be successfully adjusted (e.g. because
// it points into the middle of a component that was entirely removed or into
// the middle of an encoding sequence), it will be set to base::string16::npos.
// For consistency, if an input offset points between the scheme and the
// username/password, and both are removed, on output this offset will be 0
// rather than npos; this means that offsets at the starts and ends of removed
// components are always transformed the same way regardless of what other
// components are adjacent.
NET_EXPORT base::string16 FormatUrl(const GURL& url,
const std::string& languages,
FormatUrlTypes format_types,
UnescapeRule::Type unescape_rules,
url::Parsed* new_parsed,
size_t* prefix_end,
size_t* offset_for_adjustment);
NET_EXPORT base::string16 FormatUrlWithOffsets(
const GURL& url,
const std::string& languages,
FormatUrlTypes format_types,
UnescapeRule::Type unescape_rules,
url::Parsed* new_parsed,
size_t* prefix_end,
std::vector<size_t>* offsets_for_adjustment);
// This function is like those above except it takes |adjustments| rather
// than |offset[s]_for_adjustment|. |adjustments| will be set to reflect all
// the transformations that happened to |url| to convert it into the returned
// value.
NET_EXPORT base::string16 FormatUrlWithAdjustments(
const GURL& url,
const std::string& languages,
FormatUrlTypes format_types,
UnescapeRule::Type unescape_rules,
url::Parsed* new_parsed,
size_t* prefix_end,
base::OffsetAdjuster::Adjustments* adjustments);
// This is a convenience function for FormatUrl() with
// format_types = kFormatUrlOmitAll and unescape = SPACES. This is the typical
// set of flags for "URLs to display to the user". You should be cautious about
// using this for URLs which will be parsed or sent to other applications.
inline base::string16 FormatUrl(const GURL& url, const std::string& languages) {
return FormatUrl(url, languages, kFormatUrlOmitAll, UnescapeRule::SPACES,
// Returns whether FormatUrl() would strip a trailing slash from |url|, given a
// format flag including kFormatUrlOmitTrailingSlashOnBareHostname.
NET_EXPORT bool CanStripTrailingSlash(const GURL& url);
// Strip the portions of |url| that aren't core to the network request.
// - user name / password
// - reference section
NET_EXPORT_PRIVATE GURL SimplifyUrlForRequest(const GURL& url);
NET_EXPORT void SetExplicitlyAllowedPorts(const std::string& allowed_ports);
class NET_EXPORT ScopedPortException {
explicit ScopedPortException(int port);
int port_;
// Returns true if it can determine that only loopback addresses are configured.
// i.e. if only and ::1 are routable.
// Also returns false if it cannot determine this.
bool HaveOnlyLoopbackAddresses();
// Returns AddressFamily of the address.
NET_EXPORT_PRIVATE AddressFamily GetAddressFamily(
const IPAddressNumber& address);
// Maps the given AddressFamily to either AF_INET, AF_INET6 or AF_UNSPEC.
NET_EXPORT_PRIVATE int ConvertAddressFamily(AddressFamily address_family);
// Parses an IP address literal (either IPv4 or IPv6) to its numeric value.
// Returns true on success and fills |ip_number| with the numeric value.
NET_EXPORT_PRIVATE bool ParseIPLiteralToNumber(const std::string& ip_literal,
IPAddressNumber* ip_number);
// Converts an IPv4 address to an IPv4-mapped IPv6 address.
// For example would be converted to ::ffff:
NET_EXPORT_PRIVATE IPAddressNumber ConvertIPv4NumberToIPv6Number(
const IPAddressNumber& ipv4_number);
// Returns true iff |address| is an IPv4-mapped IPv6 address.
NET_EXPORT_PRIVATE bool IsIPv4Mapped(const IPAddressNumber& address);
// Converts an IPv4-mapped IPv6 address to IPv4 address. Should only be called
// on IPv4-mapped IPv6 addresses.
NET_EXPORT_PRIVATE IPAddressNumber ConvertIPv4MappedToIPv4(
const IPAddressNumber& address);
// Parses an IP block specifier from CIDR notation to an
// (IP address, prefix length) pair. Returns true on success and fills
// |*ip_number| with the numeric value of the IP address and sets
// |*prefix_length_in_bits| with the length of the prefix.
// CIDR notation literals can use either IPv4 or IPv6 literals. Some examples:
// a:b:c::/46
// ::1/128
NET_EXPORT bool ParseCIDRBlock(const std::string& cidr_literal,
IPAddressNumber* ip_number,
size_t* prefix_length_in_bits);
// Compares an IP address to see if it falls within the specified IP block.
// Returns true if it does, false otherwise.
// The IP block is given by (|ip_prefix|, |prefix_length_in_bits|) -- any
// IP address whose |prefix_length_in_bits| most significant bits match
// |ip_prefix| will be matched.
// In cases when an IPv4 address is being compared to an IPv6 address prefix
// and vice versa, the IPv4 addresses will be converted to IPv4-mapped
// (IPv6) addresses.
NET_EXPORT_PRIVATE bool IPNumberMatchesPrefix(const IPAddressNumber& ip_number,
const IPAddressNumber& ip_prefix,
size_t prefix_length_in_bits);
// Retuns the port field of the |sockaddr|.
const uint16* GetPortFieldFromSockaddr(const struct sockaddr* address,
socklen_t address_len);
// Returns the value of port in |sockaddr| (in host byte ordering).
NET_EXPORT_PRIVATE int GetPortFromSockaddr(const struct sockaddr* address,
socklen_t address_len);
// Returns true if |host| is one of the names (e.g. "localhost") or IP
// addresses (IPv4 or IPv6 ::1) that indicate a loopback.
// Note that this function does not check for IP addresses other than
// the above, although other IP addresses may point to the local
// machine.
NET_EXPORT_PRIVATE bool IsLocalhost(const std::string& host);
// struct that is used by GetNetworkList() to represent a network
// interface.
struct NET_EXPORT NetworkInterface {
NetworkInterface(const std::string& name,
const std::string& friendly_name,
uint32 interface_index,
NetworkChangeNotifier::ConnectionType type,
const IPAddressNumber& address,
size_t network_prefix);
std::string name;
std::string friendly_name; // Same as |name| on non-Windows.
uint32 interface_index; // Always 0 on Android.
NetworkChangeNotifier::ConnectionType type;
IPAddressNumber address;
size_t network_prefix;
typedef std::vector<NetworkInterface> NetworkInterfaceList;
// Policy settings to include/exclude network interfaces.
enum HostAddressSelectionPolicy {
// Include temp address only when interface has both permanent and
// temp addresses.
// Returns list of network interfaces except loopback interface. If an
// interface has more than one address, a separate entry is added to
// the list for each address.
// Can be called only on a thread that allows IO.
NET_EXPORT bool GetNetworkList(NetworkInterfaceList* networks,
int policy);
// General category of the IEEE 802.11 (wifi) physical layer operating mode.
enum WifiPHYLayerProtocol {
// No wifi support or no associated AP.
// An obsolete modes introduced by the original 802.11, e.g. IR, FHSS.
// 802.11a, OFDM-based rates.
// 802.11b, DSSS or HR DSSS.
// 802.11g, same rates as 802.11a but compatible with 802.11b.
// 802.11n, HT rates.
// Unclassified mode or failure to identify.
// Characterize the PHY mode of the currently associated access point.
// Currently only available on OS_WIN.
NET_EXPORT WifiPHYLayerProtocol GetWifiPHYLayerProtocol();
// Returns number of matching initial bits between the addresses |a1| and |a2|.
unsigned CommonPrefixLength(const IPAddressNumber& a1,
const IPAddressNumber& a2);
// Computes the number of leading 1-bits in |mask|.
unsigned MaskPrefixLength(const IPAddressNumber& mask);
// Differentiated Services Code Point.
// See for details.
enum DiffServCodePoint {
DSCP_DEFAULT = 0, // Same as DSCP_CS0
DSCP_CS0 = 0, // The default
DSCP_CS1 = 8, // Bulk/background traffic
DSCP_AF11 = 10,
DSCP_AF12 = 12,
DSCP_AF13 = 14,
DSCP_CS2 = 16,
DSCP_AF21 = 18,
DSCP_AF22 = 20,
DSCP_AF23 = 22,
DSCP_CS3 = 24,
DSCP_AF31 = 26,
DSCP_AF32 = 28,
DSCP_AF33 = 30,
DSCP_CS4 = 32,
DSCP_AF41 = 34, // Video
DSCP_AF42 = 36, // Video
DSCP_AF43 = 38, // Video
DSCP_CS5 = 40, // Video
DSCP_EF = 46, // Voice
DSCP_CS6 = 48, // Voice
DSCP_CS7 = 56, // Control messages
} // namespace net
#endif // NET_BASE_NET_UTIL_H_