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#include "network.h"
#include <util/folder/dirut.h>
#include <util/folder/path.h>
#include <util/generic/singleton.h>
#include <util/generic/utility.h>
#include <util/generic/vector.h>
#include <util/generic/ylimits.h>
#include <util/network/address.h>
#include <util/network/sock.h>
#include <util/random/random.h>
#include <util/stream/file.h>
#include <util/string/split.h>
#include <util/system/env.h>
#include <util/system/error.h>
#include <util/system/file_lock.h>
#include <util/system/fs.h>
#ifdef _darwin_
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
namespace {
#define Y_VERIFY_SYSERROR(expr) \
do { \
if (!(expr)) { \
Y_FAIL(#expr ", errno=%d", LastSystemError()); \
} \
} while (false)
class TPortGuard : public NTesting::IPort {
public:
TPortGuard(ui16 port, THolder<TFileLock> lock)
: Lock_(std::move(lock))
, Port_(port)
{
}
~TPortGuard() override {
Y_VERIFY_SYSERROR(NFs::Remove(Lock_->GetName()));
}
ui16 Get() override {
return Port_;
}
private:
THolder<TFileLock> Lock_;
ui16 Port_;
};
std::pair<ui16, ui16> GetEphemeralRange() {
// IANA suggestion
std::pair<ui16, ui16> pair{(1 << 15) + (1 << 14), (1 << 16) - 1};
#ifdef _linux_
if (NFs::Exists("/proc/sys/net/ipv4/ip_local_port_range")) {
TIFStream fileStream("/proc/sys/net/ipv4/ip_local_port_range");
fileStream >> pair.first >> pair.second;
}
#endif
#ifdef _darwin_
ui32 first, last;
size_t size;
sysctlbyname("net.inet.ip.portrange.first", &first, &size, NULL, 0);
sysctlbyname("net.inet.ip.portrange.last", &last, &size, NULL, 0);
pair.first = first;
pair.second = last;
#endif
return pair;
}
TVector<std::pair<ui16, ui16>> GetPortRanges() {
TString givenRange = GetEnv("VALID_PORT_RANGE");
TVector<std::pair<ui16, ui16>> ranges;
if (givenRange.Contains(':')) {
auto res = StringSplitter(givenRange).Split(':').Limit(2).ToList<TString>();
ranges.emplace_back(FromString<ui16>(res.front()), FromString<ui16>(res.back()));
} else {
const ui16 firstValid = 1025;
const ui16 lastValid = Max<ui16>();
auto [firstEphemeral, lastEphemeral] = GetEphemeralRange();
const ui16 firstInvalid = Max(firstEphemeral, firstValid);
const ui16 lastInvalid = Min(lastEphemeral, lastValid);
if (firstInvalid > firstValid)
ranges.emplace_back(firstValid, firstInvalid - 1);
if (lastInvalid < lastValid)
ranges.emplace_back(lastInvalid + 1, lastValid);
}
return ranges;
}
class TPortManager {
static constexpr size_t Retries = 20;
public:
TPortManager()
: SyncDir_(GetEnv("PORT_SYNC_PATH"))
, Ranges_(GetPortRanges())
, TotalCount_(0)
{
if (!SyncDir_.IsDefined()) {
SyncDir_ = TFsPath(GetSystemTempDir()) / "yandex_port_locks";
}
Y_VERIFY(SyncDir_.IsDefined());
NFs::MakeDirectoryRecursive(SyncDir_);
for (auto [left, right] : Ranges_) {
TotalCount_ += right - left;
}
Y_VERIFY(0 != TotalCount_);
}
NTesting::TPortHolder GetFreePort() const {
ui16 salt = RandomNumber<ui16>();
for (ui16 attempt = 0; attempt < TotalCount_; ++attempt) {
ui16 probe = (salt + attempt) % TotalCount_;
for (auto [left, right] : Ranges_) {
if (probe >= right - left)
probe -= right - left;
else {
probe += left;
break;
}
}
auto port = TryAcquirePort(probe);
if (port) {
return NTesting::TPortHolder{std::move(port)};
}
}
Y_FAIL("Cannot get free port!");
}
TVector<NTesting::TPortHolder> GetFreePortsRange(size_t count) const {
Y_VERIFY(count > 0);
TVector<NTesting::TPortHolder> ports(Reserve(count));
for (size_t i = 0; i < Retries; ++i) {
for (auto[left, right] : Ranges_) {
if (right - left < count) {
continue;
}
ui16 start = left + RandomNumber<ui16>((right - left) / 2);
if (right - start < count) {
continue;
}
for (ui16 probe = start; probe < right; ++probe) {
auto port = TryAcquirePort(probe);
if (port) {
ports.emplace_back(std::move(port));
} else {
ports.clear();
}
if (ports.size() == count) {
return ports;
}
}
// Can't find required number of ports without gap in the current range
ports.clear();
}
}
Y_FAIL("Cannot get range of %zu ports!", count);
}
private:
THolder<NTesting::IPort> TryAcquirePort(ui16 port) const {
auto lock = MakeHolder<TFileLock>(TString(SyncDir_ / ::ToString(port)));
if (!lock->TryAcquire()) {
return nullptr;
}
TInet6StreamSocket sock;
Y_VERIFY_SYSERROR(INVALID_SOCKET != static_cast<SOCKET>(sock));
TSockAddrInet6 addr("::", port);
if (sock.Bind(&addr) != 0) {
lock->Release();
Y_VERIFY(EADDRINUSE == LastSystemError(), "unexpected error: %d", LastSystemError());
return nullptr;
}
return MakeHolder<TPortGuard>(port, std::move(lock));
}
private:
TFsPath SyncDir_;
TVector<std::pair<ui16, ui16>> Ranges_;
size_t TotalCount_;
};
}
namespace NTesting {
TPortHolder GetFreePort() {
return Singleton<TPortManager>()->GetFreePort();
}
namespace NLegacy {
TVector<TPortHolder> GetFreePortsRange(size_t count) {
return Singleton<TPortManager>()->GetFreePortsRange(count);
}
}
IOutputStream& operator<<(IOutputStream& out, const TPortHolder& port) {
return out << static_cast<ui16>(port);
}
}
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