net: implement windows version of LookupHost/Port/SRV

R=brainman, rsc
CC=golang-dev
https://golang.org/cl/1748042

src/pkg/net/Makefile

@@ -7,8 +7,6 @@ include ../../Make.$(GOARCH)
 TARG=net
 GOFILES=\
 	dial.go\
-	dnsclient.go\
-	dnsconfig.go\
 	dnsmsg.go\
 	fd_$(GOOS).go\
 	hosts.go\
@@ -18,7 +16,6 @@ GOFILES=\
 	net.go\
 	parse.go\
 	pipe.go\
-	port.go\
 	sock.go\
 	tcpsock.go\
 	udpsock.go\
@@ -27,18 +24,33 @@ GOFILES=\
 GOFILES_freebsd=\
 	newpollserver.go\
 	fd.go\
+	dnsconfig.go\
+	dnsclient.go\
+	port.go\
 
 GOFILES_darwin=\
 	newpollserver.go\
 	fd.go\
+	dnsconfig.go\
+	dnsclient.go\
+	port.go\
 	
 GOFILES_linux=\
 	newpollserver.go\
 	fd.go\
+	dnsconfig.go\
+	dnsclient.go\
+	port.go\
 	
 GOFILES_nacl=\
 	newpollserver.go\
 	fd.go\
+	dnsconfig.go\
+	dnsclient.go\
+	port.go\
+
+GOFILES_windows=\
+	resolv_windows.go\
 
 GOFILES+=$(GOFILES_$(GOOS))
 

src/pkg/net/resolv_windows.go

@@ -0,0 +1,78 @@
+// 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 (
+	"syscall"
+	"unsafe"
+	"os"
+	"sync"
+)
+
+var hostentLock sync.Mutex
+var serventLock sync.Mutex
+
+func LookupHost(name string) (cname string, addrs []string, err os.Error) {
+	hostentLock.Lock()
+	defer hostentLock.Unlock()
+	h, e := syscall.GetHostByName(name)
+	if e != 0 {
+		return "", nil, os.NewSyscallError("GetHostByName", e)
+	}
+	cname = name
+	switch h.AddrType {
+	case syscall.AF_INET:
+		i := 0
+		addrs = make([]string, 100) // plenty of room to grow
+		for p := (*[100](*[4]byte))(unsafe.Pointer(h.AddrList)); i < cap(addrs) && p[i] != nil; i++ {
+			addrs[i] = IPv4(p[i][0], p[i][1], p[i][2], p[i][3]).String()
+		}
+		addrs = addrs[0:i]
+	default: // TODO(vcc): Implement non IPv4 address lookups.
+		return "", nil, os.NewSyscallError("LookupHost", syscall.EWINDOWS)
+	}
+	return cname, addrs, nil
+}
+
+type SRV struct {
+	Target   string
+	Port     uint16
+	Priority uint16
+	Weight   uint16
+}
+
+func LookupSRV(name string) (cname string, addrs []*SRV, err os.Error) {
+	var r *syscall.DNSRecord
+	e := syscall.DnsQuery(name, syscall.DNS_TYPE_SRV, 0, nil, &r, nil)
+	if int(e) != 0 {
+		return "", nil, os.NewSyscallError("LookupSRV", int(e))
+	}
+	defer syscall.DnsRecordListFree(r, 1)
+	addrs = make([]*SRV, 100)
+	i := 0
+	for p := r; p != nil && p.Type == syscall.DNS_TYPE_SRV; p = p.Next {
+		v := (*syscall.DNSSRVData)(unsafe.Pointer(&p.Data[0]))
+		addrs[i] = &SRV{syscall.UTF16ToString((*[256]uint16)(unsafe.Pointer(v.Target))), v.Port, v.Priority, v.Weight}
+		i++
+	}
+	addrs = addrs[0:i]
+	return name, addrs, nil
+}
+
+func LookupPort(network, service string) (port int, err os.Error) {
+	switch network {
+	case "tcp4", "tcp6":
+		network = "tcp"
+	case "udp4", "udp6":
+		network = "udp"
+	}
+	serventLock.Lock()
+	defer serventLock.Unlock()
+	s, e := syscall.GetServByName(service, network)
+	if e != 0 {
+		return 0, os.NewSyscallError("GetServByName", e)
+	}
+	return int(syscall.Ntohs(s.Port)), nil
+}

src/pkg/syscall/mksyscall_windows.sh

@@ -216,6 +216,9 @@ while(<>) {
 			$ret[$i] = sprintf("r%d", $i);
 			$ret[$i+1] = sprintf("r%d", $i+1);
 		}
+		if($type =~ /^\*/) {
+			$reg = "unsafe.Pointer($reg)";
+		}
 		if($i == 0) {
 			if($type eq "bool") {
 				$failexpr = "!$name";
@@ -238,7 +241,7 @@ while(<>) {
 			$body .= "\t\t$name = 0;\n";
 			$body .= "\t}\n";
 		} else {
-			$body .= "\t$name = $type($reg);\n";
+			$body .= "\t$name = ($type)($reg);\n";
 		}
 		push @pout, sprintf "\"%s=\", %s, ", $name, $name;
 	}

src/pkg/syscall/syscall_windows.go

@@ -429,6 +429,12 @@ func Utimes(path string, tv []Timeval) (errno int) {
 //sys	GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = wsock32.GetAcceptExSockaddrs
 //sys	WSARecv(s uint32, bufs *WSABuf, bufcnt uint32, recvd *uint32, flags *uint32, overlapped *Overlapped, croutine *byte) (errno int) [failretval=-1] = ws2_32.WSARecv
 //sys	WSASend(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32, overlapped *Overlapped, croutine *byte) (errno int) [failretval=-1] = ws2_32.WSASend
+//sys	GetHostByName(name string) (h *Hostent, errno int) [failretval=nil] = ws2_32.gethostbyname
+//sys	GetServByName(name string, proto string) (s *Servent, errno int) [failretval=nil] = ws2_32.getservbyname
+//sys	Ntohs(netshort uint16) (u uint16) = ws2_32.ntohs
+//sys	DnsQuery(name string, qtype uint16, options uint32, extra *byte, qrs **DNSRecord, pr *byte) (status uint32) = dnsapi.DnsQuery_W
+//sys	DnsRecordListFree(rl *DNSRecord, freetype uint32) = dnsapi.DnsRecordListFree
+
 
 type RawSockaddrInet4 struct {
 	Family uint16

src/pkg/syscall/zsyscall_windows_386.go

@@ -10,6 +10,7 @@ var (
 	modadvapi32 = loadDll("advapi32.dll")
 	modwsock32  = loadDll("wsock32.dll")
 	modws2_32   = loadDll("ws2_32.dll")
+	moddnsapi   = loadDll("dnsapi.dll")
 
 	procGetLastError               = getSysProcAddr(modkernel32, "GetLastError")
 	procLoadLibraryW               = getSysProcAddr(modkernel32, "LoadLibraryW")
@@ -66,6 +67,11 @@ var (
 	procGetAcceptExSockaddrs       = getSysProcAddr(modwsock32, "GetAcceptExSockaddrs")
 	procWSARecv                    = getSysProcAddr(modws2_32, "WSARecv")
 	procWSASend                    = getSysProcAddr(modws2_32, "WSASend")
+	procgethostbyname              = getSysProcAddr(modws2_32, "gethostbyname")
+	procgetservbyname              = getSysProcAddr(modws2_32, "getservbyname")
+	procntohs                      = getSysProcAddr(modws2_32, "ntohs")
+	procDnsQuery_W                 = getSysProcAddr(moddnsapi, "DnsQuery_W")
+	procDnsRecordListFree          = getSysProcAddr(moddnsapi, "DnsRecordListFree")
 )
 
 func GetLastError() (lasterrno int) {
@@ -848,3 +854,50 @@ func WSASend(s uint32, bufs *WSABuf, bufcnt uint32, sent *uint32, flags uint32,
 	}
 	return
 }
+
+func GetHostByName(name string) (h *Hostent, errno int) {
+	r0, _, e1 := Syscall(procgethostbyname, uintptr(unsafe.Pointer(StringBytePtr(name))), 0, 0)
+	h = (*Hostent)(unsafe.Pointer(r0))
+	if h == nil {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func GetServByName(name string, proto string) (s *Servent, errno int) {
+	r0, _, e1 := Syscall(procgetservbyname, uintptr(unsafe.Pointer(StringBytePtr(name))), uintptr(unsafe.Pointer(StringBytePtr(proto))), 0)
+	s = (*Servent)(unsafe.Pointer(r0))
+	if s == nil {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func Ntohs(netshort uint16) (u uint16) {
+	r0, _, _ := Syscall(procntohs, uintptr(netshort), 0, 0)
+	u = (uint16)(r0)
+	return
+}
+
+func DnsQuery(name string, qtype uint16, options uint32, extra *byte, qrs **DNSRecord, pr *byte) (status uint32) {
+	r0, _, _ := Syscall6(procDnsQuery_W, uintptr(unsafe.Pointer(StringToUTF16Ptr(name))), uintptr(qtype), uintptr(options), uintptr(unsafe.Pointer(extra)), uintptr(unsafe.Pointer(qrs)), uintptr(unsafe.Pointer(pr)))
+	status = (uint32)(r0)
+	return
+}
+
+func DnsRecordListFree(rl *DNSRecord, freetype uint32) {
+	Syscall(procDnsRecordListFree, uintptr(unsafe.Pointer(rl)), uintptr(freetype), 0)
+	return
+}

src/pkg/syscall/ztypes_windows_386.go

@@ -1,7 +1,3 @@
-// godefs -gsyscall -f-m32 types_linux.c
-
-// MACHINE GENERATED - DO NOT EDIT.
-
 package syscall
 
 // TODO(brainman): autogenerate types in ztypes_windows_386.go
@@ -247,9 +243,10 @@ type Timezoneinformation struct {
 // Socket related.
 
 const (
-	AF_UNIX  = 1
+	AF_UNIX    = 1
-	AF_INET  = 2
+	AF_INET    = 2
-	AF_INET6 = 23
+	AF_INET6   = 23
+	AF_NETBIOS = 17
 
 	SOCK_STREAM = 1
 	SOCK_DGRAM  = 2
@@ -336,3 +333,102 @@ const (
 	FILE_TYPE_REMOTE  = 0x8000
 	FILE_TYPE_UNKNOWN = 0x0000
 )
+
+type Hostent struct {
+	Name     *byte
+	Aliases  **byte
+	AddrType uint16
+	Length   uint16
+	AddrList **byte
+}
+
+type Servent struct {
+	Name    *byte
+	Aliases **byte
+	Port    uint16
+	Proto   *byte
+}
+
+const (
+	DNS_TYPE_A       = 0x0001
+	DNS_TYPE_NS      = 0x0002
+	DNS_TYPE_MD      = 0x0003
+	DNS_TYPE_MF      = 0x0004
+	DNS_TYPE_CNAME   = 0x0005
+	DNS_TYPE_SOA     = 0x0006
+	DNS_TYPE_MB      = 0x0007
+	DNS_TYPE_MG      = 0x0008
+	DNS_TYPE_MR      = 0x0009
+	DNS_TYPE_NULL    = 0x000a
+	DNS_TYPE_WKS     = 0x000b
+	DNS_TYPE_PTR     = 0x000c
+	DNS_TYPE_HINFO   = 0x000d
+	DNS_TYPE_MINFO   = 0x000e
+	DNS_TYPE_MX      = 0x000f
+	DNS_TYPE_TEXT    = 0x0010
+	DNS_TYPE_RP      = 0x0011
+	DNS_TYPE_AFSDB   = 0x0012
+	DNS_TYPE_X25     = 0x0013
+	DNS_TYPE_ISDN    = 0x0014
+	DNS_TYPE_RT      = 0x0015
+	DNS_TYPE_NSAP    = 0x0016
+	DNS_TYPE_NSAPPTR = 0x0017
+	DNS_TYPE_SIG     = 0x0018
+	DNS_TYPE_KEY     = 0x0019
+	DNS_TYPE_PX      = 0x001a
+	DNS_TYPE_GPOS    = 0x001b
+	DNS_TYPE_AAAA    = 0x001c
+	DNS_TYPE_LOC     = 0x001d
+	DNS_TYPE_NXT     = 0x001e
+	DNS_TYPE_EID     = 0x001f
+	DNS_TYPE_NIMLOC  = 0x0020
+	DNS_TYPE_SRV     = 0x0021
+	DNS_TYPE_ATMA    = 0x0022
+	DNS_TYPE_NAPTR   = 0x0023
+	DNS_TYPE_KX      = 0x0024
+	DNS_TYPE_CERT    = 0x0025
+	DNS_TYPE_A6      = 0x0026
+	DNS_TYPE_DNAME   = 0x0027
+	DNS_TYPE_SINK    = 0x0028
+	DNS_TYPE_OPT     = 0x0029
+	DNS_TYPE_DS      = 0x002B
+	DNS_TYPE_RRSIG   = 0x002E
+	DNS_TYPE_NSEC    = 0x002F
+	DNS_TYPE_DNSKEY  = 0x0030
+	DNS_TYPE_DHCID   = 0x0031
+	DNS_TYPE_UINFO   = 0x0064
+	DNS_TYPE_UID     = 0x0065
+	DNS_TYPE_GID     = 0x0066
+	DNS_TYPE_UNSPEC  = 0x0067
+	DNS_TYPE_ADDRS   = 0x00f8
+	DNS_TYPE_TKEY    = 0x00f9
+	DNS_TYPE_TSIG    = 0x00fa
+	DNS_TYPE_IXFR    = 0x00fb
+	DNS_TYPE_AXFR    = 0x00fc
+	DNS_TYPE_MAILB   = 0x00fd
+	DNS_TYPE_MAILA   = 0x00fe
+	DNS_TYPE_ALL     = 0x00ff
+	DNS_TYPE_ANY     = 0x00ff
+	DNS_TYPE_WINS    = 0xff01
+	DNS_TYPE_WINSR   = 0xff02
+	DNS_TYPE_NBSTAT  = 0xff01
+)
+
+type DNSSRVData struct {
+	Target   *uint16
+	Priority uint16
+	Weight   uint16
+	Port     uint16
+	Pad      uint16
+}
+
+type DNSRecord struct {
+	Next     *DNSRecord
+	Name     *uint16
+	Type     uint16
+	Length   uint16
+	Dw       uint32
+	Ttl      uint32
+	Reserved uint32
+	Data     [40]byte
+}