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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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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"os"
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"syscall"
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"unsafe"
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)
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func cgoLookupHost(name string) (addrs []string, err os.Error, completed bool) {
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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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func cgoLookupPort(net, service string) (port int, err os.Error, completed bool) {
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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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func cgoLookupIPCNAME(name string) (addrs []IP, cname string, err os.Error, completed bool) {
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var res *C.struct_addrinfo
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var hints C.struct_addrinfo
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// NOTE(rsc): In theory there are approximately balanced
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// arguments for and against including AI_ADDRCONFIG
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// in the flags (it includes IPv4 results only on IPv4 systems,
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// and similarly for IPv6), but in practice setting it causes
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// getaddrinfo to return the wrong canonical name on Linux.
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// So definitely leave it out.
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2011-04-21 08:22:53 -06:00
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hints.ai_flags = (C.AI_ALL | C.AI_V4MAPPED | C.AI_CANONNAME) & cgoAddrInfoMask()
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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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str = err.String()
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} else {
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str = C.GoString(C.gai_strerror(gerrno))
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}
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return nil, "", &DNSError{Error: str, Name: name}, true
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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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// Everything comes back twice, once for UDP and once for TCP.
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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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func cgoLookupIP(name string) (addrs []IP, err os.Error, completed bool) {
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addrs, _, err, completed = cgoLookupIPCNAME(name)
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return
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}
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func cgoLookupCNAME(name string) (cname string, err os.Error, completed bool) {
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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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