func cgoLookupPort(network, service string) (port int, err error, completed bool) {
acquireThread()
defer releaseThread()
var hints syscall.Addrinfo
switch network {
case "": // no hints
case "tcp", "tcp4", "tcp6":
hints.Ai_socktype = syscall.SOCK_STREAM
hints.Ai_protocol = syscall.IPPROTO_TCP
case "udp", "udp4", "udp6":
hints.Ai_socktype = syscall.SOCK_DGRAM
hints.Ai_protocol = syscall.IPPROTO_UDP
default:
return 0, &DNSError{Err: "unknown network", Name: network + "/" + service}, true
}
if len(network) >= 4 {
switch network[3] {
case '4':
hints.Ai_family = syscall.AF_INET
case '6':
hints.Ai_family = syscall.AF_INET6
}
}
s := syscall.StringBytePtr(service)
var res *syscall.Addrinfo
syscall.Entersyscall()
gerrno := libc_getaddrinfo(nil, s, &hints, &res)
syscall.Exitsyscall()
if gerrno != 0 {
switch gerrno {
case syscall.EAI_SYSTEM:
errno := syscall.GetErrno()
if errno == 0 { // see golang.org/issue/6232
errno = syscall.EMFILE
}
err = errno
default:
err = addrinfoErrno(gerrno)
}
return 0, &DNSError{Err: err.Error(), Name: network + "/" + service}, true
}
defer libc_freeaddrinfo(res)
for r := res; r != nil; r = r.Ai_next {
switch r.Ai_family {
case syscall.AF_INET:
sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(r.Ai_addr))
p := (*[2]byte)(unsafe.Pointer(&sa.Port))
return int(p[0])<<8 | int(p[1]), nil, true
case syscall.AF_INET6:
sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(r.Ai_addr))
p := (*[2]byte)(unsafe.Pointer(&sa.Port))
return int(p[0])<<8 | int(p[1]), nil, true
}
}
return 0, &DNSError{Err: "unknown port", Name: network + "/" + service}, true
}
func cgoLookupPort(net, service string) (port int, err error, completed bool) {
acquireThread()
defer releaseThread()
var res *syscall.Addrinfo
var hints syscall.Addrinfo
switch net {
case "":
// no hints
case "tcp", "tcp4", "tcp6":
hints.Ai_socktype = syscall.SOCK_STREAM
hints.Ai_protocol = syscall.IPPROTO_TCP
case "udp", "udp4", "udp6":
hints.Ai_socktype = syscall.SOCK_DGRAM
hints.Ai_protocol = syscall.IPPROTO_UDP
default:
return 0, UnknownNetworkError(net), true
}
if len(net) >= 4 {
switch net[3] {
case '4':
hints.Ai_family = syscall.AF_INET
case '6':
hints.Ai_family = syscall.AF_INET6
}
}
s := syscall.StringBytePtr(service)
syscall.Entersyscall()
gerrno := libc_getaddrinfo(nil, s, &hints, &res)
syscall.Exitsyscall()
if gerrno == 0 {
defer libc_freeaddrinfo(res)
for r := res; r != nil; r = r.Ai_next {
switch r.Ai_family {
default:
continue
case syscall.AF_INET:
sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(r.Ai_addr))
p := (*[2]byte)(unsafe.Pointer(&sa.Port))
return int(p[0])<<8 | int(p[1]), nil, true
case syscall.AF_INET6:
sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(r.Ai_addr))
p := (*[2]byte)(unsafe.Pointer(&sa.Port))
return int(p[0])<<8 | int(p[1]), nil, true
}
}
}
return 0, &AddrError{"unknown port", net + "/" + service}, true
}