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// Copyright (c) 2011 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/dns/dns_util.h"
#include <errno.h>
#include <limits.h>
#include <cstring>
#include "base/metrics/field_trial.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "build/build_config.h"
#if defined(OS_POSIX)
#include <netinet/in.h>
#if !defined(OS_NACL)
#include <net/if.h>
#if !defined(OS_ANDROID)
#include <ifaddrs.h>
#endif // !defined(OS_ANDROID)
#endif // !defined(OS_NACL)
#endif // defined(OS_POSIX)
#if defined(OS_ANDROID)
#include "net/android/network_library.h"
#endif
namespace net {
// Based on DJB's public domain code.
bool DNSDomainFromDot(const base::StringPiece& dotted, std::string* out) {
const char* buf = dotted.data();
unsigned n = dotted.size();
char label[63];
size_t labellen = 0; /* <= sizeof label */
char name[255];
size_t namelen = 0; /* <= sizeof name */
char ch;
for (;;) {
if (!n)
break;
ch = *buf++;
--n;
if (ch == '.') {
// Don't allow empty labels per http://crbug.com/456391.
if (!labellen)
return false;
if (namelen + labellen + 1 > sizeof name)
return false;
name[namelen++] = static_cast<char>(labellen);
memcpy(name + namelen, label, labellen);
namelen += labellen;
labellen = 0;
continue;
}
if (labellen >= sizeof label)
return false;
label[labellen++] = ch;
}
// Allow empty label at end of name to disable suffix search.
if (labellen) {
if (namelen + labellen + 1 > sizeof name)
return false;
name[namelen++] = static_cast<char>(labellen);
memcpy(name + namelen, label, labellen);
namelen += labellen;
labellen = 0;
}
if (namelen + 1 > sizeof name)
return false;
if (namelen == 0) // Empty names e.g. "", "." are not valid.
return false;
name[namelen++] = 0; // This is the root label (of length 0).
*out = std::string(name, namelen);
return true;
}
std::string DNSDomainToString(const base::StringPiece& domain) {
std::string ret;
for (unsigned i = 0; i < domain.size() && domain[i]; i += domain[i] + 1) {
#if CHAR_MIN < 0
if (domain[i] < 0)
return std::string();
#endif
if (domain[i] > 63)
return std::string();
if (i)
ret += ".";
if (static_cast<unsigned>(domain[i]) + i + 1 > domain.size())
return std::string();
domain.substr(i + 1, domain[i]).AppendToString(&ret);
}
return ret;
}
bool HaveOnlyLoopbackAddresses() {
#if defined(OS_ANDROID)
return android::HaveOnlyLoopbackAddresses();
#elif defined(OS_NACL)
NOTIMPLEMENTED();
return false;
#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)
}
#if !defined(OS_NACL)
namespace {
bool GetTimeDeltaForConnectionTypeFromFieldTrial(
const char* field_trial,
NetworkChangeNotifier::ConnectionType type,
base::TimeDelta* out) {
std::string group = base::FieldTrialList::FindFullName(field_trial);
if (group.empty())
return false;
std::vector<base::StringPiece> group_parts = base::SplitStringPiece(
group, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
if (type < 0)
return false;
size_t type_size = static_cast<size_t>(type);
if (type_size >= group_parts.size())
return false;
int64_t ms;
if (!base::StringToInt64(group_parts[type_size], &ms))
return false;
*out = base::TimeDelta::FromMilliseconds(ms);
return true;
}
} // namespace
base::TimeDelta GetTimeDeltaForConnectionTypeFromFieldTrialOrDefault(
const char* field_trial,
base::TimeDelta default_delta,
NetworkChangeNotifier::ConnectionType type) {
base::TimeDelta out;
if (!GetTimeDeltaForConnectionTypeFromFieldTrial(field_trial, type, &out))
out = default_delta;
return out;
}
#endif // !defined(OS_NACL)
} // namespace net
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