/usr/share/gocode/src/github.com/coreos/pkg/netutil/proxy.go is in golang-github-coreos-pkg-dev 0.0~git20151028.0.2c77715-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | package netutil
import (
"io"
"net"
"sync"
"time"
"github.com/coreos/pkg/capnslog"
)
var (
log = capnslog.NewPackageLogger("github.com/coreos/pkg/netutil", "main")
)
// ProxyTCP proxies between two TCP connections.
// Because TLS connections don't have CloseRead() and CloseWrite() methods, our
// temporary solution is to use timeouts.
func ProxyTCP(conn1, conn2 net.Conn, tlsWriteDeadline, tlsReadDeadline time.Duration) {
var wg sync.WaitGroup
wg.Add(2)
go copyBytes(conn1, conn2, &wg, tlsWriteDeadline, tlsReadDeadline)
go copyBytes(conn2, conn1, &wg, tlsWriteDeadline, tlsReadDeadline)
wg.Wait()
conn1.Close()
conn2.Close()
}
func copyBytes(dst, src net.Conn, wg *sync.WaitGroup, writeDeadline, readDeadline time.Duration) {
defer wg.Done()
n, err := io.Copy(dst, src)
if err != nil {
log.Errorf("proxy i/o error: %v", err)
}
if cr, ok := src.(*net.TCPConn); ok {
cr.CloseRead()
} else {
// For TLS connections.
wto := time.Now().Add(writeDeadline)
src.SetWriteDeadline(wto)
}
if cw, ok := dst.(*net.TCPConn); ok {
cw.CloseWrite()
} else {
// For TLS connections.
rto := time.Now().Add(readDeadline)
dst.SetReadDeadline(rto)
}
log.Debugf("proxy copied %d bytes %s -> %s", n, src.RemoteAddr(), dst.RemoteAddr())
}
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