func gethostbyname(name string) (addrs []IP, err error) {
h, err := syscall.GetHostByName(name)
if err != nil {
return nil, os.NewSyscallError("GetHostByName", err)
}
switch h.AddrType {
case syscall.AF_INET:
i := 0
addrs = make([]IP, 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])
}
addrs = addrs[0:i]
default: // TODO(vcc): Implement non IPv4 address lookups.
return nil, os.NewSyscallError("LookupIP", syscall.EWINDOWS)
}
return addrs, nil
}
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
}