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quic: add multiple internal utilities
* add the CID implementation * add the PreferredAddress implementation * add Path and PathStorage implementations * add Store implementation * add QuicError implementation PR-URL: #47263 Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: Stephen Belanger <[email protected]> Reviewed-By: Tobias Nießen <[email protected]>
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#if HAVE_OPENSSL && NODE_OPENSSL_HAS_QUIC | ||
#include "cid.h" | ||
#include <crypto/crypto_util.h> | ||
#include <memory_tracker-inl.h> | ||
#include <node_mutex.h> | ||
#include <string_bytes.h> | ||
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namespace node { | ||
namespace quic { | ||
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// ============================================================================ | ||
// CID | ||
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CID::CID() : ptr_(&cid_) { | ||
cid_.datalen = 0; | ||
} | ||
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CID::CID(const ngtcp2_cid& cid) : CID(cid.data, cid.datalen) {} | ||
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CID::CID(const uint8_t* data, size_t len) : CID() { | ||
DCHECK_GE(len, kMinLength); | ||
DCHECK_LE(len, kMaxLength); | ||
ngtcp2_cid_init(&cid_, data, len); | ||
} | ||
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CID::CID(const ngtcp2_cid* cid) : ptr_(cid) { | ||
CHECK_NOT_NULL(cid); | ||
DCHECK_GE(cid->datalen, kMinLength); | ||
DCHECK_LE(cid->datalen, kMaxLength); | ||
} | ||
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CID::CID(const CID& other) : ptr_(&cid_) { | ||
CHECK_NOT_NULL(other.ptr_); | ||
ngtcp2_cid_init(&cid_, other.ptr_->data, other.ptr_->datalen); | ||
} | ||
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bool CID::operator==(const CID& other) const noexcept { | ||
if (this == &other || (length() == 0 && other.length() == 0)) return true; | ||
if (length() != other.length()) return false; | ||
return memcmp(ptr_->data, other.ptr_->data, ptr_->datalen) == 0; | ||
} | ||
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bool CID::operator!=(const CID& other) const noexcept { | ||
return !(*this == other); | ||
} | ||
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CID::operator const uint8_t*() const { | ||
return ptr_->data; | ||
} | ||
CID::operator const ngtcp2_cid&() const { | ||
return *ptr_; | ||
} | ||
CID::operator const ngtcp2_cid*() const { | ||
return ptr_; | ||
} | ||
CID::operator bool() const { | ||
return ptr_->datalen >= kMinLength; | ||
} | ||
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size_t CID::length() const { | ||
return ptr_->datalen; | ||
} | ||
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std::string CID::ToString() const { | ||
char dest[kMaxLength * 2]; | ||
size_t written = | ||
StringBytes::hex_encode(reinterpret_cast<const char*>(ptr_->data), | ||
ptr_->datalen, | ||
dest, | ||
arraysize(dest)); | ||
return std::string(dest, written); | ||
} | ||
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CID CID::kInvalid{}; | ||
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// ============================================================================ | ||
// CID::Hash | ||
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size_t CID::Hash::operator()(const CID& cid) const { | ||
size_t hash = 0; | ||
for (size_t n = 0; n < cid.length(); n++) { | ||
hash ^= std::hash<uint8_t>{}(cid.ptr_->data[n] + 0x9e3779b9 + (hash << 6) + | ||
(hash >> 2)); | ||
} | ||
return hash; | ||
} | ||
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// ============================================================================ | ||
// CID::Factory | ||
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namespace { | ||
class RandomCIDFactory : public CID::Factory { | ||
public: | ||
RandomCIDFactory() = default; | ||
RandomCIDFactory(const RandomCIDFactory&) = delete; | ||
RandomCIDFactory(RandomCIDFactory&&) = delete; | ||
RandomCIDFactory& operator=(const RandomCIDFactory&) = delete; | ||
RandomCIDFactory& operator=(RandomCIDFactory&&) = delete; | ||
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CID Generate(size_t length_hint) const override { | ||
DCHECK_GE(length_hint, CID::kMinLength); | ||
DCHECK_LE(length_hint, CID::kMaxLength); | ||
Mutex::ScopedLock lock(mutex_); | ||
maybe_refresh_pool(length_hint); | ||
auto start = pool_ + pos_; | ||
pos_ += length_hint; | ||
return CID(start, length_hint); | ||
} | ||
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void GenerateInto(ngtcp2_cid* cid, | ||
size_t length_hint = CID::kMaxLength) const override { | ||
DCHECK_GE(length_hint, CID::kMinLength); | ||
DCHECK_LE(length_hint, CID::kMaxLength); | ||
Mutex::ScopedLock lock(mutex_); | ||
maybe_refresh_pool(length_hint); | ||
auto start = pool_ + pos_; | ||
pos_ += length_hint; | ||
ngtcp2_cid_init(cid, start, length_hint); | ||
} | ||
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private: | ||
void maybe_refresh_pool(size_t length_hint) const { | ||
// We generate a pool of random data kPoolSize in length | ||
// and pull our random CID from that. If we don't have | ||
// enough random random remaining in the pool to generate | ||
// a CID of the requested size, we regenerate the pool | ||
// and reset it to zero. | ||
if (pos_ + length_hint > kPoolSize) { | ||
CHECK(crypto::CSPRNG(pool_, kPoolSize).is_ok()); | ||
pos_ = 0; | ||
} | ||
} | ||
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static constexpr int kPoolSize = 4096; | ||
mutable int pos_ = kPoolSize; | ||
mutable uint8_t pool_[kPoolSize]; | ||
mutable Mutex mutex_; | ||
}; | ||
} // namespace | ||
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const CID::Factory& CID::Factory::random() { | ||
static RandomCIDFactory instance; | ||
return instance; | ||
} | ||
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} // namespace quic | ||
} // namespace node | ||
#endif // HAVE_OPENSSL && NODE_OPENSSL_HAS_QUIC |
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#pragma once | ||
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#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS | ||
#if HAVE_OPENSSL && NODE_OPENSSL_HAS_QUIC | ||
#include <memory_tracker.h> | ||
#include <ngtcp2/ngtcp2.h> | ||
#include <string> | ||
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namespace node { | ||
namespace quic { | ||
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// CIDS are used to identify endpoints participating in a QUIC session. | ||
// Once created, CID instances are immutable. | ||
// | ||
// CIDs contain between 1 to 20 bytes. Most typically they are selected | ||
// randomly but there is a spec for creating "routable" CIDs that encode | ||
// a specific structure that is meaningful only to the side that creates | ||
// the CID. For most purposes, CIDs should be treated as opaque tokens. | ||
// | ||
// Each peer in a QUIC session generates one or more CIDs that the *other* | ||
// peer will use to identify the session. When a QUIC client initiates a | ||
// brand new session, it will initially generates a CID of its own (its | ||
// source CID) and a random placeholder CID for the server (the original | ||
// destination CID). When the server receives the initial packet, it will | ||
// generate its own source CID and use the clients source CID as the | ||
// server's destination CID. | ||
// | ||
// Client Server | ||
// ------------------------------------------- | ||
// Source CID <====> Destination CID | ||
// Destination CID <====> Source CID | ||
// | ||
// While the connection is being established, it is possible for either | ||
// peer to generate additional CIDs that are also associated with the | ||
// connection. | ||
class CID final : public MemoryRetainer { | ||
public: | ||
static constexpr size_t kMinLength = NGTCP2_MIN_CIDLEN; | ||
static constexpr size_t kMaxLength = NGTCP2_MAX_CIDLEN; | ||
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// Copy the given ngtcp2_cid. | ||
explicit CID(const ngtcp2_cid& cid); | ||
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// Copy the given buffer as a CID. The len must be within | ||
// kMinLength and kMaxLength. | ||
explicit CID(const uint8_t* data, size_t len); | ||
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// Wrap the given ngtcp2_cid. The CID does not take ownership | ||
// of the underlying ngtcp2_cid. | ||
explicit CID(const ngtcp2_cid* cid); | ||
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CID(const CID& other); | ||
CID(CID&& other) = delete; | ||
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struct Hash final { | ||
size_t operator()(const CID& cid) const; | ||
}; | ||
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bool operator==(const CID& other) const noexcept; | ||
bool operator!=(const CID& other) const noexcept; | ||
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operator const uint8_t*() const; | ||
operator const ngtcp2_cid&() const; | ||
operator const ngtcp2_cid*() const; | ||
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// True if the CID length is at least kMinLength; | ||
operator bool() const; | ||
size_t length() const; | ||
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std::string ToString() const; | ||
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SET_NO_MEMORY_INFO() | ||
SET_MEMORY_INFO_NAME(CID) | ||
SET_SELF_SIZE(CID) | ||
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template <typename T> | ||
using Map = std::unordered_map<CID, T, CID::Hash>; | ||
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// A CID::Factory, as the name suggests, is used to create new CIDs. | ||
// Per https://datatracker.ietf.org/doc/draft-ietf-quic-load-balancers/, QUIC | ||
// implementations MAY use the Connection ID associated with a QUIC session | ||
// as a routing mechanism, with each CID instance securely encoding the | ||
// routing information. By default, our implementation creates CIDs randomly | ||
// but will allow user code to provide their own CID::Factory implementation. | ||
class Factory; | ||
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static CID kInvalid; | ||
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private: | ||
// The default constructor creates an empty, zero-length CID. | ||
// Zero-length CIDs are not usable. We use them as a placeholder | ||
// for a missing or empty CID value. | ||
CID(); | ||
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ngtcp2_cid cid_; | ||
const ngtcp2_cid* ptr_; | ||
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friend struct Hash; | ||
}; | ||
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class CID::Factory { | ||
public: | ||
virtual ~Factory() = default; | ||
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// Generate a new CID. The length_hint must be between CID::kMinLength | ||
// and CID::kMaxLength. The implementation can choose to ignore the length. | ||
virtual CID Generate(size_t length_hint = CID::kMaxLength) const = 0; | ||
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// Generate a new CID into the given ngtcp2_cid. This variation of | ||
// Generate should be used far less commonly. It is provided largely | ||
// for a couple of internal cases. | ||
virtual void GenerateInto(ngtcp2_cid* cid, | ||
size_t length_hint = CID::kMaxLength) const = 0; | ||
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// The default random CID generator instance. | ||
static const Factory& random(); | ||
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// TODO(@jasnell): This will soon also include additional implementations | ||
// of CID::Factory that implement the QUIC Load Balancers spec. | ||
}; | ||
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} // namespace quic | ||
} // namespace node | ||
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#endif // HAVE_OPENSSL && NODE_OPENSSL_HAS_QUIC | ||
#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS |
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