1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
#pragma once
#include "channel.h"
#include <erebos/storage.h>
#include <netinet/in.h>
#include <cstdint>
#include <memory>
#include <mutex>
#include <variant>
#include <vector>
#include <optional>
namespace erebos {
using std::mutex;
using std::optional;
using std::unique_ptr;
using std::variant;
using std::vector;
class NetworkProtocol
{
public:
NetworkProtocol();
explicit NetworkProtocol(int sock, Identity self);
NetworkProtocol(const NetworkProtocol &) = delete;
NetworkProtocol(NetworkProtocol &&);
NetworkProtocol & operator=(const NetworkProtocol &) = delete;
NetworkProtocol & operator=(NetworkProtocol &&);
~NetworkProtocol();
static constexpr char defaultVersion[] = "0.1";
class Connection;
struct Header;
struct ReceivedAnnounce;
struct NewConnection;
struct ConnectionReadReady;
struct ProtocolClosed {};
using PollResult = variant<
ReceivedAnnounce,
NewConnection,
ConnectionReadReady,
ProtocolClosed>;
PollResult poll();
struct Cookie { vector<uint8_t> value; };
using ChannelState = variant<monostate,
Cookie,
Stored<ChannelRequest>,
shared_ptr<struct WaitingRef>,
Stored<ChannelAccept>,
unique_ptr<Channel>>;
Connection connect(sockaddr_in6 addr);
void updateIdentity(Identity self);
void announceTo(variant<sockaddr_in, sockaddr_in6> addr);
void shutdown();
private:
bool recvfrom(vector<uint8_t> & buffer, sockaddr_in6 & addr);
void sendto(const vector<uint8_t> & buffer, variant<sockaddr_in, sockaddr_in6> addr);
void sendCookie(variant<sockaddr_in, sockaddr_in6> addr);
optional<Connection> verifyNewConnection(const Header & header, sockaddr_in6 addr);
Cookie generateCookie(variant<sockaddr_in, sockaddr_in6> addr) const;
bool verifyCookie(variant<sockaddr_in, sockaddr_in6> addr, const Cookie & cookie) const;
int sock;
mutex protocolMutex;
vector<uint8_t> buffer;
optional<Identity> self;
struct ConnectionPriv;
vector<ConnectionPriv *> connections;
};
class NetworkProtocol::Connection
{
friend class NetworkProtocol;
Connection(unique_ptr<ConnectionPriv> p);
public:
Connection(const Connection &) = delete;
Connection(Connection &&);
Connection & operator=(const Connection &) = delete;
Connection & operator=(Connection &&);
~Connection();
using Id = uintptr_t;
Id id() const;
const sockaddr_in6 & peerAddress() const;
optional<Header> receive(const PartialStorage &);
bool send(const PartialStorage &, NetworkProtocol::Header,
const vector<Object> &, bool secure);
void close();
// temporary:
ChannelState & channel();
void trySendOutQueue();
private:
static optional<Header> receive(vector<uint8_t> & buf,
Channel * channel,
const PartialStorage & st);
unique_ptr<ConnectionPriv> p;
};
struct NetworkProtocol::ReceivedAnnounce { sockaddr_in6 addr; Digest digest; };
struct NetworkProtocol::NewConnection { Connection conn; };
struct NetworkProtocol::ConnectionReadReady { Connection::Id id; };
struct NetworkProtocol::Header
{
struct Acknowledged { Digest value; };
struct Version { string value; };
struct Initiation { Digest value; };
struct CookieSet { Cookie value; };
struct CookieEcho { Cookie value; };
struct DataRequest { Digest value; };
struct DataResponse { Digest value; };
struct AnnounceSelf { Digest value; };
struct AnnounceUpdate { Digest value; };
struct ChannelRequest { Digest value; };
struct ChannelAccept { Digest value; };
struct ServiceType { UUID value; };
struct ServiceRef { Digest value; };
using Item = variant<
Acknowledged,
Version,
Initiation,
CookieSet,
CookieEcho,
DataRequest,
DataResponse,
AnnounceSelf,
AnnounceUpdate,
ChannelRequest,
ChannelAccept,
ServiceType,
ServiceRef>;
Header(const vector<Item> & items): items(items) {}
static optional<Header> load(const PartialRef &);
static optional<Header> load(const PartialObject &);
PartialObject toObject(const PartialStorage &) const;
template<class T> const T * lookupFirst() const;
vector<Item> items;
};
template<class T>
const T * NetworkProtocol::Header::lookupFirst() const
{
for (const auto & h : items)
if (auto ptr = std::get_if<T>(&h))
return ptr;
return nullptr;
}
bool operator==(const NetworkProtocol::Header::Item &, const NetworkProtocol::Header::Item &);
inline bool operator!=(const NetworkProtocol::Header::Item & left,
const NetworkProtocol::Header::Item & right)
{ return not (left == right); }
inline bool operator==(const NetworkProtocol::Cookie & left, const NetworkProtocol::Cookie & right)
{ return left.value == right.value; }
class ReplyBuilder
{
public:
void header(NetworkProtocol::Header::Item &&);
void body(const Ref &);
const vector<NetworkProtocol::Header::Item> & header() const { return mheader; }
vector<Object> body() const;
private:
vector<NetworkProtocol::Header::Item> mheader;
vector<Ref> mbody;
};
struct WaitingRef
{
const Storage storage;
const PartialRef ref;
vector<Digest> missing;
optional<Ref> check();
optional<Ref> check(ReplyBuilder &);
};
}
|