2011-04-20 13:21:59 -06:00
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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2013-06-10 12:55:16 -06:00
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// +build !netgo
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2013-08-23 10:18:22 -06:00
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// +build darwin dragonfly freebsd linux netbsd openbsd
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build: add build comments to core packages
The go/build package already recognizes
system-specific file names like
mycode_darwin.go
mycode_darwin_386.go
mycode_386.s
However, it is also common to write files that
apply to multiple architectures, so a recent CL added
to go/build the ability to process comments
listing a set of conditions for building. For example:
// +build darwin freebsd openbsd/386
says that this file should be compiled only on
OS X, FreeBSD, or 32-bit x86 OpenBSD systems.
These conventions are not yet documented
(hence this long CL description).
This CL adds build comments to the multi-system
files in the core library, a step toward making it
possible to use go/build to build them.
With this change go/build can handle crypto/rand,
exec, net, path/filepath, os/user, and time.
os and syscall need additional adjustments.
R=golang-dev, r, gri, r, gustavo
CC=golang-dev
https://golang.org/cl/5011046
2011-09-15 14:48:57 -06:00
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2011-04-20 13:21:59 -06:00
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package net
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/*
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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*/
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import "C"
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import (
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"syscall"
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"unsafe"
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)
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2011-11-01 20:05:34 -06:00
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func cgoLookupHost(name string) (addrs []string, err error, completed bool) {
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2011-04-20 13:21:59 -06:00
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ip, err, completed := cgoLookupIP(name)
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for _, p := range ip {
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addrs = append(addrs, p.String())
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}
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return
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}
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2011-11-01 20:05:34 -06:00
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func cgoLookupPort(net, service string) (port int, err error, completed bool) {
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2013-08-16 20:43:05 -06:00
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acquireThread()
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defer releaseThread()
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2011-04-20 13:21:59 -06:00
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var res *C.struct_addrinfo
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var hints C.struct_addrinfo
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switch net {
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case "":
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// no hints
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case "tcp", "tcp4", "tcp6":
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hints.ai_socktype = C.SOCK_STREAM
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hints.ai_protocol = C.IPPROTO_TCP
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case "udp", "udp4", "udp6":
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hints.ai_socktype = C.SOCK_DGRAM
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hints.ai_protocol = C.IPPROTO_UDP
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default:
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return 0, UnknownNetworkError(net), true
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}
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if len(net) >= 4 {
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switch net[3] {
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case '4':
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hints.ai_family = C.AF_INET
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case '6':
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hints.ai_family = C.AF_INET6
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}
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}
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s := C.CString(service)
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defer C.free(unsafe.Pointer(s))
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if C.getaddrinfo(nil, s, &hints, &res) == 0 {
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defer C.freeaddrinfo(res)
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for r := res; r != nil; r = r.ai_next {
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switch r.ai_family {
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default:
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continue
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case C.AF_INET:
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sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(r.ai_addr))
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p := (*[2]byte)(unsafe.Pointer(&sa.Port))
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return int(p[0])<<8 | int(p[1]), nil, true
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case C.AF_INET6:
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sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(r.ai_addr))
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p := (*[2]byte)(unsafe.Pointer(&sa.Port))
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return int(p[0])<<8 | int(p[1]), nil, true
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}
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}
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}
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return 0, &AddrError{"unknown port", net + "/" + service}, true
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}
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2011-11-01 20:05:34 -06:00
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func cgoLookupIPCNAME(name string) (addrs []IP, cname string, err error, completed bool) {
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2013-08-16 20:43:05 -06:00
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acquireThread()
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defer releaseThread()
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2011-04-20 13:21:59 -06:00
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var res *C.struct_addrinfo
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var hints C.struct_addrinfo
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2012-06-03 07:54:14 -06:00
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hints.ai_flags = cgoAddrInfoFlags()
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2013-08-09 10:23:27 -06:00
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hints.ai_socktype = C.SOCK_STREAM
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2011-04-20 13:21:59 -06:00
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h := C.CString(name)
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defer C.free(unsafe.Pointer(h))
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gerrno, err := C.getaddrinfo(h, nil, &hints, &res)
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if gerrno != 0 {
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var str string
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if gerrno == C.EAI_NONAME {
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str = noSuchHost
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} else if gerrno == C.EAI_SYSTEM {
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2013-09-11 09:38:56 -06:00
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if err == nil {
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// err should not be nil, but sometimes getaddrinfo returns
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// gerrno == C.EAI_SYSTEM with err == nil on Linux.
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// The report claims that it happens when we have too many
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// open files, so use syscall.EMFILE (too many open files in system).
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// Most system calls would return ENFILE (too many open files),
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// so at the least EMFILE should be easy to recognize if this
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// comes up again. golang.org/issue/6232.
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err = syscall.EMFILE
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}
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2011-11-01 20:05:34 -06:00
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str = err.Error()
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2011-04-20 13:21:59 -06:00
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} else {
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str = C.GoString(C.gai_strerror(gerrno))
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}
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2011-11-01 20:05:34 -06:00
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return nil, "", &DNSError{Err: str, Name: name}, true
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2011-04-20 13:21:59 -06:00
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}
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defer C.freeaddrinfo(res)
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if res != nil {
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cname = C.GoString(res.ai_canonname)
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if cname == "" {
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cname = name
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}
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if len(cname) > 0 && cname[len(cname)-1] != '.' {
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cname += "."
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}
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}
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for r := res; r != nil; r = r.ai_next {
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2013-08-09 10:23:27 -06:00
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// We only asked for SOCK_STREAM, but check anyhow.
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2011-04-20 13:21:59 -06:00
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if r.ai_socktype != C.SOCK_STREAM {
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continue
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}
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switch r.ai_family {
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default:
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continue
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case C.AF_INET:
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sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(r.ai_addr))
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addrs = append(addrs, copyIP(sa.Addr[:]))
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case C.AF_INET6:
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sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(r.ai_addr))
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addrs = append(addrs, copyIP(sa.Addr[:]))
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}
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}
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return addrs, cname, nil, true
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}
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2011-11-01 20:05:34 -06:00
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func cgoLookupIP(name string) (addrs []IP, err error, completed bool) {
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2011-04-20 13:21:59 -06:00
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addrs, _, err, completed = cgoLookupIPCNAME(name)
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return
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}
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2011-11-01 20:05:34 -06:00
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func cgoLookupCNAME(name string) (cname string, err error, completed bool) {
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2011-04-20 13:21:59 -06:00
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_, cname, err, completed = cgoLookupIPCNAME(name)
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return
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}
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func copyIP(x IP) IP {
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y := make(IP, len(x))
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copy(y, x)
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return y
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}
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