summaryrefslogtreecommitdiffstats
path: root/src/net/ipsock_plan9.go
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/net/ipsock_plan9.go366
1 files changed, 366 insertions, 0 deletions
diff --git a/src/net/ipsock_plan9.go b/src/net/ipsock_plan9.go
new file mode 100644
index 0000000..7a4b7a6
--- /dev/null
+++ b/src/net/ipsock_plan9.go
@@ -0,0 +1,366 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+ "context"
+ "internal/bytealg"
+ "io/fs"
+ "os"
+ "syscall"
+)
+
+// Probe probes IPv4, IPv6 and IPv4-mapped IPv6 communication
+// capabilities.
+//
+// Plan 9 uses IPv6 natively, see ip(3).
+func (p *ipStackCapabilities) probe() {
+ p.ipv4Enabled = probe(netdir+"/iproute", "4i")
+ p.ipv6Enabled = probe(netdir+"/iproute", "6i")
+ if p.ipv4Enabled && p.ipv6Enabled {
+ p.ipv4MappedIPv6Enabled = true
+ }
+}
+
+func probe(filename, query string) bool {
+ var file *file
+ var err error
+ if file, err = open(filename); err != nil {
+ return false
+ }
+ defer file.close()
+
+ r := false
+ for line, ok := file.readLine(); ok && !r; line, ok = file.readLine() {
+ f := getFields(line)
+ if len(f) < 3 {
+ continue
+ }
+ for i := 0; i < len(f); i++ {
+ if query == f[i] {
+ r = true
+ break
+ }
+ }
+ }
+ return r
+}
+
+// parsePlan9Addr parses address of the form [ip!]port (e.g. 127.0.0.1!80).
+func parsePlan9Addr(s string) (ip IP, iport int, err error) {
+ addr := IPv4zero // address contains port only
+ i := bytealg.IndexByteString(s, '!')
+ if i >= 0 {
+ addr = ParseIP(s[:i])
+ if addr == nil {
+ return nil, 0, &ParseError{Type: "IP address", Text: s}
+ }
+ }
+ p, plen, ok := dtoi(s[i+1:])
+ if !ok {
+ return nil, 0, &ParseError{Type: "port", Text: s}
+ }
+ if p < 0 || p > 0xFFFF {
+ return nil, 0, &AddrError{Err: "invalid port", Addr: s[i+1 : i+1+plen]}
+ }
+ return addr, p, nil
+}
+
+func readPlan9Addr(net, filename string) (addr Addr, err error) {
+ var buf [128]byte
+
+ f, err := os.Open(filename)
+ if err != nil {
+ return
+ }
+ defer f.Close()
+ n, err := f.Read(buf[:])
+ if err != nil {
+ return
+ }
+ ip, port, err := parsePlan9Addr(string(buf[:n]))
+ if err != nil {
+ return
+ }
+ switch net {
+ case "tcp4", "udp4":
+ if ip.Equal(IPv6zero) {
+ ip = ip[:IPv4len]
+ }
+ }
+ switch net {
+ case "tcp", "tcp4", "tcp6":
+ addr = &TCPAddr{IP: ip, Port: port}
+ case "udp", "udp4", "udp6":
+ addr = &UDPAddr{IP: ip, Port: port}
+ default:
+ return nil, UnknownNetworkError(net)
+ }
+ return addr, nil
+}
+
+func startPlan9(ctx context.Context, net string, addr Addr) (ctl *os.File, dest, proto, name string, err error) {
+ var (
+ ip IP
+ port int
+ )
+ switch a := addr.(type) {
+ case *TCPAddr:
+ proto = "tcp"
+ ip = a.IP
+ port = a.Port
+ case *UDPAddr:
+ proto = "udp"
+ ip = a.IP
+ port = a.Port
+ default:
+ err = UnknownNetworkError(net)
+ return
+ }
+
+ if port > 65535 {
+ err = InvalidAddrError("port should be < 65536")
+ return
+ }
+
+ clone, dest, err := queryCS1(ctx, proto, ip, port)
+ if err != nil {
+ return
+ }
+ f, err := os.OpenFile(clone, os.O_RDWR, 0)
+ if err != nil {
+ return
+ }
+ var buf [16]byte
+ n, err := f.Read(buf[:])
+ if err != nil {
+ f.Close()
+ return
+ }
+ return f, dest, proto, string(buf[:n]), nil
+}
+
+func fixErr(err error) {
+ oe, ok := err.(*OpError)
+ if !ok {
+ return
+ }
+ nonNilInterface := func(a Addr) bool {
+ switch a := a.(type) {
+ case *TCPAddr:
+ return a == nil
+ case *UDPAddr:
+ return a == nil
+ case *IPAddr:
+ return a == nil
+ default:
+ return false
+ }
+ }
+ if nonNilInterface(oe.Source) {
+ oe.Source = nil
+ }
+ if nonNilInterface(oe.Addr) {
+ oe.Addr = nil
+ }
+ if pe, ok := oe.Err.(*fs.PathError); ok {
+ if _, ok = pe.Err.(syscall.ErrorString); ok {
+ oe.Err = pe.Err
+ }
+ }
+}
+
+func dialPlan9(ctx context.Context, net string, laddr, raddr Addr) (fd *netFD, err error) {
+ defer func() { fixErr(err) }()
+ type res struct {
+ fd *netFD
+ err error
+ }
+ resc := make(chan res)
+ go func() {
+ testHookDialChannel()
+ fd, err := dialPlan9Blocking(ctx, net, laddr, raddr)
+ select {
+ case resc <- res{fd, err}:
+ case <-ctx.Done():
+ if fd != nil {
+ fd.Close()
+ }
+ }
+ }()
+ select {
+ case res := <-resc:
+ return res.fd, res.err
+ case <-ctx.Done():
+ return nil, mapErr(ctx.Err())
+ }
+}
+
+func dialPlan9Blocking(ctx context.Context, net string, laddr, raddr Addr) (fd *netFD, err error) {
+ if isWildcard(raddr) {
+ raddr = toLocal(raddr, net)
+ }
+ f, dest, proto, name, err := startPlan9(ctx, net, raddr)
+ if err != nil {
+ return nil, err
+ }
+ if la := plan9LocalAddr(laddr); la == "" {
+ err = hangupCtlWrite(ctx, proto, f, "connect "+dest)
+ } else {
+ err = hangupCtlWrite(ctx, proto, f, "connect "+dest+" "+la)
+ }
+ if err != nil {
+ f.Close()
+ return nil, err
+ }
+ data, err := os.OpenFile(netdir+"/"+proto+"/"+name+"/data", os.O_RDWR, 0)
+ if err != nil {
+ f.Close()
+ return nil, err
+ }
+ laddr, err = readPlan9Addr(net, netdir+"/"+proto+"/"+name+"/local")
+ if err != nil {
+ data.Close()
+ f.Close()
+ return nil, err
+ }
+ return newFD(proto, name, nil, f, data, laddr, raddr)
+}
+
+func listenPlan9(ctx context.Context, net string, laddr Addr) (fd *netFD, err error) {
+ defer func() { fixErr(err) }()
+ f, dest, proto, name, err := startPlan9(ctx, net, laddr)
+ if err != nil {
+ return nil, err
+ }
+ _, err = f.WriteString("announce " + dest)
+ if err != nil {
+ f.Close()
+ return nil, &OpError{Op: "announce", Net: net, Source: laddr, Addr: nil, Err: err}
+ }
+ laddr, err = readPlan9Addr(net, netdir+"/"+proto+"/"+name+"/local")
+ if err != nil {
+ f.Close()
+ return nil, err
+ }
+ return newFD(proto, name, nil, f, nil, laddr, nil)
+}
+
+func (fd *netFD) netFD() (*netFD, error) {
+ return newFD(fd.net, fd.n, fd.listen, fd.ctl, fd.data, fd.laddr, fd.raddr)
+}
+
+func (fd *netFD) acceptPlan9() (nfd *netFD, err error) {
+ defer func() { fixErr(err) }()
+ if err := fd.pfd.ReadLock(); err != nil {
+ return nil, err
+ }
+ defer fd.pfd.ReadUnlock()
+ listen, err := os.Open(fd.dir + "/listen")
+ if err != nil {
+ return nil, err
+ }
+ var buf [16]byte
+ n, err := listen.Read(buf[:])
+ if err != nil {
+ listen.Close()
+ return nil, err
+ }
+ name := string(buf[:n])
+ ctl, err := os.OpenFile(netdir+"/"+fd.net+"/"+name+"/ctl", os.O_RDWR, 0)
+ if err != nil {
+ listen.Close()
+ return nil, err
+ }
+ data, err := os.OpenFile(netdir+"/"+fd.net+"/"+name+"/data", os.O_RDWR, 0)
+ if err != nil {
+ listen.Close()
+ ctl.Close()
+ return nil, err
+ }
+ raddr, err := readPlan9Addr(fd.net, netdir+"/"+fd.net+"/"+name+"/remote")
+ if err != nil {
+ listen.Close()
+ ctl.Close()
+ data.Close()
+ return nil, err
+ }
+ return newFD(fd.net, name, listen, ctl, data, fd.laddr, raddr)
+}
+
+func isWildcard(a Addr) bool {
+ var wildcard bool
+ switch a := a.(type) {
+ case *TCPAddr:
+ wildcard = a.isWildcard()
+ case *UDPAddr:
+ wildcard = a.isWildcard()
+ case *IPAddr:
+ wildcard = a.isWildcard()
+ }
+ return wildcard
+}
+
+func toLocal(a Addr, net string) Addr {
+ switch a := a.(type) {
+ case *TCPAddr:
+ a.IP = loopbackIP(net)
+ case *UDPAddr:
+ a.IP = loopbackIP(net)
+ case *IPAddr:
+ a.IP = loopbackIP(net)
+ }
+ return a
+}
+
+// plan9LocalAddr returns a Plan 9 local address string.
+// See setladdrport at https://9p.io/sources/plan9/sys/src/9/ip/devip.c.
+func plan9LocalAddr(addr Addr) string {
+ var ip IP
+ port := 0
+ switch a := addr.(type) {
+ case *TCPAddr:
+ if a != nil {
+ ip = a.IP
+ port = a.Port
+ }
+ case *UDPAddr:
+ if a != nil {
+ ip = a.IP
+ port = a.Port
+ }
+ }
+ if len(ip) == 0 || ip.IsUnspecified() {
+ if port == 0 {
+ return ""
+ }
+ return itoa(port)
+ }
+ return ip.String() + "!" + itoa(port)
+}
+
+func hangupCtlWrite(ctx context.Context, proto string, ctl *os.File, msg string) error {
+ if proto != "tcp" {
+ _, err := ctl.WriteString(msg)
+ return err
+ }
+ written := make(chan struct{})
+ errc := make(chan error)
+ go func() {
+ select {
+ case <-ctx.Done():
+ ctl.WriteString("hangup")
+ errc <- mapErr(ctx.Err())
+ case <-written:
+ errc <- nil
+ }
+ }()
+ _, err := ctl.WriteString(msg)
+ close(written)
+ if e := <-errc; err == nil && e != nil { // we hung up
+ return e
+ }
+ return err
+}