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| 1 // Copyright 2009 The Go Authors. All rights reserved. | 1 // Copyright 2009 The Go Authors. All rights reserved. |
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| 2 // Use of this source code is governed by a BSD-style | 2 // Use of this source code is governed by a BSD-style |
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| 3 // license that can be found in the LICENSE file. | 3 // license that can be found in the LICENSE file. |
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| 4 | 4 |
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| 5 // +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris | 5 // +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris |
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| 6 | 6 |
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| 7 // Read system port mappings from /etc/services | 7 // Read system port mappings from /etc/services |
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| 8 | 8 |
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| 9 package net | 9 package net |
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| 10 | 10 |
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| 11 import "sync" | 11 import "sync" |
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| 12 | 12 |
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| 13 // services contains minimal mappings between services names and port | 13 // services contains minimal mappings between services names and port |
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| 14 // numbers for platforms that don't have a complete list of port numbers | 14 // numbers for platforms that don't have a complete list of port numbers |
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| 15 // (some Solaris distros). | 15 // (some Solaris distros). |
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| 16 var services = map[string]map[string]int{ | 16 var services = map[string]map[string]int{ |
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| 17 "tcp": {"http": 80}, | 17 "tcp": {"http": 80}, |
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| 18 } | 18 } |
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| 19 var servicesError error | 19 var servicesError error |
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| 20 var onceReadServices sync.Once | 20 var onceReadServices sync.Once |
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| 21 | 21 |
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| 22 // ServicesPath points to the file with port/service mapping. |
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| 23 var ServicesPath = "/etc/services" |
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| 24 |
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| 22 func readServices() { | 25 func readServices() { |
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| 23 var file *file | 26 var file *file |
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| 24 » if file, servicesError = open("/etc/services"); servicesError != nil { | 27 » if file, servicesError = open(ServicesPath); servicesError != nil { |
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| 25 return | 28 return |
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| 26 } | 29 } |
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| 27 for line, ok := file.readLine(); ok; line, ok = file.readLine() { | 30 for line, ok := file.readLine(); ok; line, ok = file.readLine() { |
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| 28 // "http 80/tcp www www-http # World Wide Web HTTP" | 31 // "http 80/tcp www www-http # World Wide Web HTTP" |
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| 29 if i := byteIndex(line, '#'); i >= 0 { | 32 if i := byteIndex(line, '#'); i >= 0 { |
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| 30 line = line[0:i] | 33 line = line[0:i] |
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| 31 } | 34 } |
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| 32 f := getFields(line) | 35 f := getFields(line) |
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| 33 if len(f) < 2 { | 36 if len(f) < 2 { |
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| 34 continue | 37 continue |
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| 64 network = "udp" | 67 network = "udp" |
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| 65 } | 68 } |
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| 66 | 69 |
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| 67 if m, ok := services[network]; ok { | 70 if m, ok := services[network]; ok { |
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| 68 if port, ok = m[service]; ok { | 71 if port, ok = m[service]; ok { |
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| 69 return | 72 return |
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| 70 } | 73 } |
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| 71 } | 74 } |
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| 72 return 0, &AddrError{"unknown port", network + "/" + service} | 75 return 0, &AddrError{"unknown port", network + "/" + service} |
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| 73 } | 76 } |
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