1 // Copyright 2011 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
5 // +build darwin freebsd linux
10 #include <sys/types.h>
11 #include <sys/socket.h>
12 #include <netinet/in.h>
25 func libc_getaddrinfo(node *byte, service *byte, hints *syscall.Addrinfo, res **syscall.Addrinfo) int __asm__ ("getaddrinfo")
26 func libc_freeaddrinfo(res *syscall.Addrinfo) __asm__ ("freeaddrinfo")
27 func libc_gai_strerror(errcode int) *byte __asm__ ("gai_strerror")
29 // bytePtrToString takes a NUL-terminated array of bytes and convert
31 func bytePtrToString(p *byte) string {
32 a := (*[10000]byte)(unsafe.Pointer(p))
40 func cgoLookupHost(name string) (addrs []string, err os.Error, completed bool) {
41 ip, err, completed := cgoLookupIP(name)
42 for _, p := range ip {
43 addrs = append(addrs, p.String())
48 func cgoLookupPort(net, service string) (port int, err os.Error, completed bool) {
49 var res *syscall.Addrinfo
50 var hints syscall.Addrinfo
55 case "tcp", "tcp4", "tcp6":
56 hints.Ai_socktype = syscall.SOCK_STREAM
57 hints.Ai_protocol = syscall.IPPROTO_TCP
58 case "udp", "udp4", "udp6":
59 hints.Ai_socktype = syscall.SOCK_DGRAM
60 hints.Ai_protocol = syscall.IPPROTO_UDP
62 return 0, UnknownNetworkError(net), true
67 hints.Ai_family = syscall.AF_INET
69 hints.Ai_family = syscall.AF_INET6
73 s := syscall.StringBytePtr(service)
74 if libc_getaddrinfo(nil, s, &hints, &res) == 0 {
75 defer libc_freeaddrinfo(res)
76 for r := res; r != nil; r = r.Ai_next {
81 sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(r.Ai_addr))
82 p := (*[2]byte)(unsafe.Pointer(&sa.Port))
83 return int(p[0])<<8 | int(p[1]), nil, true
84 case syscall.AF_INET6:
85 sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(r.Ai_addr))
86 p := (*[2]byte)(unsafe.Pointer(&sa.Port))
87 return int(p[0])<<8 | int(p[1]), nil, true
91 return 0, &AddrError{"unknown port", net + "/" + service}, true
94 func cgoLookupIPCNAME(name string) (addrs []IP, cname string, err os.Error, completed bool) {
95 var res *syscall.Addrinfo
96 var hints syscall.Addrinfo
98 // NOTE(rsc): In theory there are approximately balanced
99 // arguments for and against including AI_ADDRCONFIG
100 // in the flags (it includes IPv4 results only on IPv4 systems,
101 // and similarly for IPv6), but in practice setting it causes
102 // getaddrinfo to return the wrong canonical name on Linux.
103 // So definitely leave it out.
104 hints.Ai_flags = int32((syscall.AI_ALL | syscall.AI_V4MAPPED | syscall.AI_CANONNAME) & cgoAddrInfoMask())
106 h := syscall.StringBytePtr(name)
107 gerrno := libc_getaddrinfo(h, nil, &hints, &res)
110 if gerrno == syscall.EAI_NONAME {
112 } else if gerrno == syscall.EAI_SYSTEM {
113 str = syscall.Errstr(syscall.GetErrno())
115 str = bytePtrToString(libc_gai_strerror(gerrno))
117 return nil, "", &DNSError{Error: str, Name: name}, true
119 defer libc_freeaddrinfo(res)
121 cname = bytePtrToString((*byte)(unsafe.Pointer(res.Ai_canonname)))
125 if len(cname) > 0 && cname[len(cname)-1] != '.' {
129 for r := res; r != nil; r = r.Ai_next {
130 // Everything comes back twice, once for UDP and once for TCP.
131 if r.Ai_socktype != syscall.SOCK_STREAM {
137 case syscall.AF_INET:
138 sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(r.Ai_addr))
139 addrs = append(addrs, copyIP(sa.Addr[:]))
140 case syscall.AF_INET6:
141 sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(r.Ai_addr))
142 addrs = append(addrs, copyIP(sa.Addr[:]))
145 return addrs, cname, nil, true
148 func cgoLookupIP(name string) (addrs []IP, err os.Error, completed bool) {
149 addrs, _, err, completed = cgoLookupIPCNAME(name)
153 func cgoLookupCNAME(name string) (cname string, err os.Error, completed bool) {
154 _, cname, err, completed = cgoLookupIPCNAME(name)
158 func copyIP(x IP) IP {
159 y := make(IP, len(x))