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-rw-r--r--src/net/port_unix.go57
1 files changed, 57 insertions, 0 deletions
diff --git a/src/net/port_unix.go b/src/net/port_unix.go
new file mode 100644
index 0000000..4fdd9a3
--- /dev/null
+++ b/src/net/port_unix.go
@@ -0,0 +1,57 @@
+// 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.
+
+// +build aix darwin dragonfly freebsd js,wasm linux netbsd openbsd solaris
+
+// Read system port mappings from /etc/services
+
+package net
+
+import (
+ "internal/bytealg"
+ "sync"
+)
+
+var onceReadServices sync.Once
+
+func readServices() {
+ file, err := open("/etc/services")
+ if err != nil {
+ return
+ }
+ defer file.close()
+
+ for line, ok := file.readLine(); ok; line, ok = file.readLine() {
+ // "http 80/tcp www www-http # World Wide Web HTTP"
+ if i := bytealg.IndexByteString(line, '#'); i >= 0 {
+ line = line[:i]
+ }
+ f := getFields(line)
+ if len(f) < 2 {
+ continue
+ }
+ portnet := f[1] // "80/tcp"
+ port, j, ok := dtoi(portnet)
+ if !ok || port <= 0 || j >= len(portnet) || portnet[j] != '/' {
+ continue
+ }
+ netw := portnet[j+1:] // "tcp"
+ m, ok1 := services[netw]
+ if !ok1 {
+ m = make(map[string]int)
+ services[netw] = m
+ }
+ for i := 0; i < len(f); i++ {
+ if i != 1 { // f[1] was port/net
+ m[f[i]] = port
+ }
+ }
+ }
+}
+
+// goLookupPort is the native Go implementation of LookupPort.
+func goLookupPort(network, service string) (port int, err error) {
+ onceReadServices.Do(readServices)
+ return lookupPortMap(network, service)
+}