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
|
package server
import (
"errors"
"log"
"net"
"sync"
"go.rctt.net/solec/core"
)
type Server struct {
listenAddr string
name string
users map[string]User
servers map[string]RemoteServer
usersMu sync.RWMutex
serversMu sync.RWMutex
}
func NewServer(listenAddr string, name string) *Server {
return &Server{
listenAddr: listenAddr,
name: name,
users: make(map[string]User),
servers: make(map[string]RemoteServer),
}
}
func (s *Server) Start() error {
ln, err := net.Listen("tcp", s.listenAddr)
if err != nil {
return err
}
for {
conn, err := ln.Accept()
if err != nil {
log.Println("cannot listen:", err)
continue
}
log.Println("client connected:", conn.RemoteAddr())
go s.handleConn(conn)
}
}
func (s *Server) handleConn(conn net.Conn) {
defer conn.Close()
cType, err := s.performHandshake(conn)
if err != nil {
log.Println("handshake error:", err)
return
}
switch cType {
case core.ConnTypeUnknown:
log.Println("invalid connection type")
case core.ConnTypeUser:
s.handleUserConn(conn)
case core.ConnTypeServer:
s.handleServerConn(conn)
}
}
func (s *Server) performHandshake(conn net.Conn) (core.ConnType, error) {
serverHs := core.Handshake{0, 2, core.ConnTypeServer}
if err := core.Send(conn, serverHs); err != nil {
return core.ConnTypeUnknown, err
}
clientPayload, err := core.Decode(conn)
if err != nil {
return core.ConnTypeUnknown, err
}
clientHs, ok := clientPayload.(core.Handshake)
if !ok {
return core.ConnTypeUnknown, core.ErrUnexpectedPayloadType
}
if serverHs.Major != clientHs.Major {
return clientHs.ConnType, errors.New("server and client are using different protocol version")
}
return clientHs.ConnType, nil
}
func (s *Server) readInput(conn net.Conn) error {
for {
payload, err := core.Decode(conn)
if err != nil {
return err
}
if err := s.handlePayload(payload); err != nil {
log.Print("handler error: ", err)
}
}
}
func (s *Server) handlePayload(payload any) error {
switch v := payload.(type) {
case core.Message:
return s.handleMessage(v)
default:
return core.ErrUnexpectedPayloadType
}
}
|
