// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/network_interfaces_getifaddrs.h"
#include <ifaddrs.h>
#include <net/if.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <memory>
#include <set>
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/posix/eintr_wrapper.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_tokenizer.h"
#include "base/strings/string_util.h"
#include "base/threading/scoped_blocking_call.h"
#include "build/build_config.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_errors.h"
#include "net/base/network_interfaces_posix.h"
#if BUILDFLAG(IS_MAC)
#include <net/if_media.h>
#include <netinet/in_var.h>
#include <sys/ioctl.h>
#endif
#if BUILDFLAG(IS_ANDROID)
#include "base/android/build_info.h"
#include "net/base/network_interfaces_getifaddrs_android.h"
// Declare getifaddrs() and freeifaddrs() weakly as they're only available
// on Android N+.
extern "C" {
int getifaddrs(struct ifaddrs** __list_ptr) __attribute__((weak_import));
void freeifaddrs(struct ifaddrs* __ptr) __attribute__((weak_import));
}
#endif // BUILDFLAG(IS_ANDROID)
namespace net {
namespace internal {
#if BUILDFLAG(IS_MAC)
// MacOSX implementation of IPAttributesGetter which calls ioctl() on socket to
// retrieve IP attributes.
class IPAttributesGetterMac : public internal::IPAttributesGetter {
public:
IPAttributesGetterMac();
~IPAttributesGetterMac() override;
bool IsInitialized() const override;
bool GetAddressAttributes(const ifaddrs* if_addr, int* attributes) override;
NetworkChangeNotifier::ConnectionType GetNetworkInterfaceType(
const ifaddrs* if_addr) override;
private:
int ioctl_socket_;
};
IPAttributesGetterMac::IPAttributesGetterMac()
: ioctl_socket_(socket(AF_INET6, SOCK_DGRAM, 0)) {
DCHECK_GE(ioctl_socket_, 0);
}
IPAttributesGetterMac::~IPAttributesGetterMac() {
if (IsInitialized()) {
PCHECK(IGNORE_EINTR(close(ioctl_socket_)) == 0);
}
}
bool IPAttributesGetterMac::IsInitialized() const {
return ioctl_socket_ >= 0;
}
int AddressFlagsToNetAddressAttributes(int flags) {
int result = 0;
if (flags & IN6_IFF_TEMPORARY) {
result |= IP_ADDRESS_ATTRIBUTE_TEMPORARY;
}
if (flags & IN6_IFF_DEPRECATED) {
result |= IP_ADDRESS_ATTRIBUTE_DEPRECATED;
}
if (flags & IN6_IFF_ANYCAST) {
result |= IP_ADDRESS_ATTRIBUTE_ANYCAST;
}
if (flags & IN6_IFF_TENTATIVE) {
result |= IP_ADDRESS_ATTRIBUTE_TENTATIVE;
}
if (flags & IN6_IFF_DUPLICATED) {
result |= IP_ADDRESS_ATTRIBUTE_DUPLICATED;
}
if (flags & IN6_IFF_DETACHED) {
result |= IP_ADDRESS_ATTRIBUTE_DETACHED;
}
return result;
}
bool IPAttributesGetterMac::GetAddressAttributes(const ifaddrs* if_addr,
int* attributes) {
struct in6_ifreq ifr = {};
strncpy(ifr.ifr_name, if_addr->ifa_name, sizeof(ifr.ifr_name) - 1);
memcpy(&ifr.ifr_ifru.ifru_addr, if_addr->ifa_addr, if_addr->ifa_addr->sa_len);
int rv = ioctl(ioctl_socket_, SIOCGIFAFLAG_IN6, &ifr);
if (rv >= 0) {
*attributes = AddressFlagsToNetAddressAttributes(ifr.ifr_ifru.ifru_flags);
}
return (rv >= 0);
}
NetworkChangeNotifier::ConnectionType
IPAttributesGetterMac::GetNetworkInterfaceType(const ifaddrs* if_addr) {
if (!IsInitialized())
return NetworkChangeNotifier::CONNECTION_UNKNOWN;
struct ifmediareq ifmr = {};
strncpy(ifmr.ifm_name, if_addr->ifa_name, sizeof(ifmr.ifm_name) - 1);
if (ioctl(ioctl_socket_, SIOCGIFMEDIA, &ifmr) != -1) {
if (ifmr.ifm_current & IFM_IEEE80211) {
return NetworkChangeNotifier::CONNECTION_WIFI;
}
if (ifmr.ifm_current & IFM_ETHER) {
return NetworkChangeNotifier::CONNECTION_ETHERNET;
}
}
return NetworkChangeNotifier::CONNECTION_UNKNOWN;
}
#endif // BUILDFLAG(IS_MAC)
bool IfaddrsToNetworkInterfaceList(int policy,
const ifaddrs* interfaces,
IPAttributesGetter* ip_attributes_getter,
NetworkInterfaceList* networks) {
// Enumerate the addresses assigned to network interfaces which are up.
for (const ifaddrs* interface = interfaces; interface != nullptr;
interface = interface->ifa_next) {
// Skip loopback interfaces, and ones which are down.
if (!(IFF_UP & interface->ifa_flags)) {
continue;
}
if (!(IFF_RUNNING & interface->ifa_flags))
continue;
if (IFF_LOOPBACK & interface->ifa_flags)
continue;
// Skip interfaces with no address configured.
struct sockaddr* addr = interface->ifa_addr;
if (!addr)
continue;
// Skip unspecified addresses (i.e. made of zeroes) and loopback addresses
// configured on non-loopback interfaces.
if (IsLoopbackOrUnspecifiedAddress(addr))
continue;
std::string name = interface->ifa_name;
// Filter out VMware interfaces, typically named vmnet1 and vmnet8.
if (ShouldIgnoreInterface(name, policy)) {
continue;
}
NetworkChangeNotifier::ConnectionType connection_type =
NetworkChangeNotifier::CONNECTION_UNKNOWN;
int ip_attributes = IP_ADDRESS_ATTRIBUTE_NONE;
// Retrieve native ip attributes and convert to net version if a getter is
// given.
if (ip_attributes_getter && ip_attributes_getter->IsInitialized()) {
if (addr->sa_family == AF_INET6 &&
ip_attributes_getter->GetAddressAttributes(interface,
&ip_attributes)) {
// Disallow addresses with attributes ANYCASE, DUPLICATED, TENTATIVE,
// and DETACHED as these are still progressing through duplicated
// address detection (DAD) or are not suitable to be used in an
// one-to-one communication and shouldn't be used by the application
// layer.
if (ip_attributes &
(IP_ADDRESS_ATTRIBUTE_ANYCAST | IP_ADDRESS_ATTRIBUTE_DUPLICATED |
IP_ADDRESS_ATTRIBUTE_TENTATIVE | IP_ADDRESS_ATTRIBUTE_DETACHED)) {
continue;
}
}
connection_type =
ip_attributes_getter->GetNetworkInterfaceType(interface);
}
IPEndPoint address;
int addr_size = 0;
if (addr->sa_family == AF_INET6) {
addr_size = sizeof(sockaddr_in6);
} else if (addr->sa_family == AF_INET) {
addr_size = sizeof(sockaddr_in);
}
if (address.FromSockAddr(addr, addr_size)) {
uint8_t prefix_length = 0;
if (interface->ifa_netmask) {
// If not otherwise set, assume the same sa_family as ifa_addr.
if (interface->ifa_netmask->sa_family == 0) {
interface->ifa_netmask->sa_family = addr->sa_family;
}
IPEndPoint netmask;
if (netmask.FromSockAddr(interface->ifa_netmask, addr_size)) {
prefix_length = MaskPrefixLength(netmask.address());
}
}
networks->push_back(NetworkInterface(
name, name, if_nametoindex(name.c_str()), connection_type,
address.address(), prefix_length, ip_attributes));
}
}
return true;
}
} // namespace internal
// This version of GetNetworkList() can only be called on Android N+, so give it
// a different and internal name so it isn't invoked mistakenly.
#if BUILDFLAG(IS_ANDROID)
namespace internal {
bool GetNetworkListUsingGetifaddrs(NetworkInterfaceList* networks,
int policy,
bool use_alternative_getifaddrs) {
DCHECK_GE(base::android::BuildInfo::GetInstance()->sdk_int(),
base::android::SDK_VERSION_NOUGAT);
DCHECK(getifaddrs);
DCHECK(freeifaddrs);
#else
bool GetNetworkList(NetworkInterfaceList* networks, int policy) {
constexpr bool use_alternative_getifaddrs = false;
#endif
if (networks == nullptr)
return false;
// getifaddrs() may require IO operations.
base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
base::BlockingType::MAY_BLOCK);
ifaddrs* interfaces;
int getifaddrs_result;
if (use_alternative_getifaddrs) {
#if BUILDFLAG(IS_ANDROID)
// Chromium ships its own implementation of getifaddrs()
// under the name Getifaddrs.
getifaddrs_result = Getifaddrs(&interfaces);
#else
NOTREACHED_IN_MIGRATION();
#endif
} else {
getifaddrs_result = getifaddrs(&interfaces);
}
if (getifaddrs_result < 0) {
PLOG(ERROR) << "getifaddrs";
return false;
}
std::unique_ptr<internal::IPAttributesGetter> ip_attributes_getter;
#if BUILDFLAG(IS_MAC)
ip_attributes_getter = std::make_unique<internal::IPAttributesGetterMac>();
#endif
bool result = internal::IfaddrsToNetworkInterfaceList(
policy, interfaces, ip_attributes_getter.get(), networks);
if (use_alternative_getifaddrs) {
#if BUILDFLAG(IS_ANDROID)
Freeifaddrs(interfaces);
#else
NOTREACHED_IN_MIGRATION();
#endif
} else {
freeifaddrs(interfaces);
}
return result;
}
#if BUILDFLAG(IS_ANDROID)
} // namespace internal
// For Android use GetWifiSSID() impl in network_interfaces_linux.cc.
#else
std::string GetWifiSSID() {
NOTIMPLEMENTED();
return std::string();
}
#endif
} // namespace net
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