Source file
src/net/tcpsock_posix.go
Documentation: net
1
2
3
4
5
6
7 package net
8
9 import (
10 "context"
11 "io"
12 "os"
13 "syscall"
14 )
15
16 func sockaddrToTCP(sa syscall.Sockaddr) Addr {
17 switch sa := sa.(type) {
18 case *syscall.SockaddrInet4:
19 return &TCPAddr{IP: sa.Addr[0:], Port: sa.Port}
20 case *syscall.SockaddrInet6:
21 return &TCPAddr{IP: sa.Addr[0:], Port: sa.Port, Zone: zoneCache.name(int(sa.ZoneId))}
22 }
23 return nil
24 }
25
26 func (a *TCPAddr) family() int {
27 if a == nil || len(a.IP) <= IPv4len {
28 return syscall.AF_INET
29 }
30 if a.IP.To4() != nil {
31 return syscall.AF_INET
32 }
33 return syscall.AF_INET6
34 }
35
36 func (a *TCPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
37 if a == nil {
38 return nil, nil
39 }
40 return ipToSockaddr(family, a.IP, a.Port, a.Zone)
41 }
42
43 func (a *TCPAddr) toLocal(net string) sockaddr {
44 return &TCPAddr{loopbackIP(net), a.Port, a.Zone}
45 }
46
47 func (c *TCPConn) readFrom(r io.Reader) (int64, error) {
48 if n, err, handled := splice(c.fd, r); handled {
49 return n, err
50 }
51 if n, err, handled := sendFile(c.fd, r); handled {
52 return n, err
53 }
54 return genericReadFrom(c, r)
55 }
56
57 func (sd *sysDialer) dialTCP(ctx context.Context, laddr, raddr *TCPAddr) (*TCPConn, error) {
58 if h := sd.testHookDialTCP; h != nil {
59 return h(ctx, sd.network, laddr, raddr)
60 }
61 if h := testHookDialTCP; h != nil {
62 return h(ctx, sd.network, laddr, raddr)
63 }
64 return sd.doDialTCP(ctx, laddr, raddr)
65 }
66
67 func (sd *sysDialer) doDialTCP(ctx context.Context, laddr, raddr *TCPAddr) (*TCPConn, error) {
68 fd, err := internetSocket(ctx, sd.network, laddr, raddr, syscall.SOCK_STREAM, 0, "dial", sd.Dialer.Control)
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 for i := 0; i < 2 && (laddr == nil || laddr.Port == 0) && (selfConnect(fd, err) || spuriousENOTAVAIL(err)); i++ {
95 if err == nil {
96 fd.Close()
97 }
98 fd, err = internetSocket(ctx, sd.network, laddr, raddr, syscall.SOCK_STREAM, 0, "dial", sd.Dialer.Control)
99 }
100
101 if err != nil {
102 return nil, err
103 }
104 return newTCPConn(fd), nil
105 }
106
107 func selfConnect(fd *netFD, err error) bool {
108
109 if err != nil {
110 return false
111 }
112
113
114
115
116
117
118
119
120
121 if fd.laddr == nil || fd.raddr == nil {
122 return true
123 }
124 l := fd.laddr.(*TCPAddr)
125 r := fd.raddr.(*TCPAddr)
126 return l.Port == r.Port && l.IP.Equal(r.IP)
127 }
128
129 func spuriousENOTAVAIL(err error) bool {
130 if op, ok := err.(*OpError); ok {
131 err = op.Err
132 }
133 if sys, ok := err.(*os.SyscallError); ok {
134 err = sys.Err
135 }
136 return err == syscall.EADDRNOTAVAIL
137 }
138
139 func (ln *TCPListener) ok() bool { return ln != nil && ln.fd != nil }
140
141 func (ln *TCPListener) accept() (*TCPConn, error) {
142 fd, err := ln.fd.accept()
143 if err != nil {
144 return nil, err
145 }
146 tc := newTCPConn(fd)
147 if ln.lc.KeepAlive >= 0 {
148 setKeepAlive(fd, true)
149 ka := ln.lc.KeepAlive
150 if ln.lc.KeepAlive == 0 {
151 ka = defaultTCPKeepAlive
152 }
153 setKeepAlivePeriod(fd, ka)
154 }
155 return tc, nil
156 }
157
158 func (ln *TCPListener) close() error {
159 return ln.fd.Close()
160 }
161
162 func (ln *TCPListener) file() (*os.File, error) {
163 f, err := ln.fd.dup()
164 if err != nil {
165 return nil, err
166 }
167 return f, nil
168 }
169
170 func (sl *sysListener) listenTCP(ctx context.Context, laddr *TCPAddr) (*TCPListener, error) {
171 fd, err := internetSocket(ctx, sl.network, laddr, nil, syscall.SOCK_STREAM, 0, "listen", sl.ListenConfig.Control)
172 if err != nil {
173 return nil, err
174 }
175 return &TCPListener{fd: fd, lc: sl.ListenConfig}, nil
176 }
177
View as plain text