net_darwin.go

     1  // Copyright 2022 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.
     4  
     5  package unix
     6  
     7  import (
     8  	"internal/abi"
     9  	"syscall"
    10  	"unsafe"
    11  )
    12  
    13  const (
    14  	AI_CANONNAME = 0x2
    15  	AI_ALL       = 0x100
    16  	AI_V4MAPPED  = 0x800
    17  	AI_MASK      = 0x1407
    18  
    19  	EAI_AGAIN    = 2
    20  	EAI_NODATA   = 7
    21  	EAI_NONAME   = 8
    22  	EAI_SERVICE  = 9
    23  	EAI_SYSTEM   = 11
    24  	EAI_OVERFLOW = 14
    25  
    26  	NI_NAMEREQD = 4
    27  )
    28  
    29  type Addrinfo struct {
    30  	Flags     int32
    31  	Family    int32
    32  	Socktype  int32
    33  	Protocol  int32
    34  	Addrlen   uint32
    35  	Canonname *byte
    36  	Addr      *syscall.RawSockaddr
    37  	Next      *Addrinfo
    38  }
    39  
    40  //go:cgo_ldflag "-lresolv"
    41  
    42  //go:cgo_import_dynamic libc_getaddrinfo getaddrinfo "/usr/lib/libSystem.B.dylib"
    43  func libc_getaddrinfo_trampoline()
    44  
    45  func Getaddrinfo(hostname, servname *byte, hints *Addrinfo, res **Addrinfo) (int, error) {
    46  	gerrno, _, errno := syscall_syscall6(abi.FuncPCABI0(libc_getaddrinfo_trampoline),
    47  		uintptr(unsafe.Pointer(hostname)),
    48  		uintptr(unsafe.Pointer(servname)),
    49  		uintptr(unsafe.Pointer(hints)),
    50  		uintptr(unsafe.Pointer(res)),
    51  		0,
    52  		0)
    53  	var err error
    54  	if errno != 0 {
    55  		err = errno
    56  	}
    57  	return int(gerrno), err
    58  }
    59  
    60  //go:cgo_import_dynamic libc_freeaddrinfo freeaddrinfo "/usr/lib/libSystem.B.dylib"
    61  func libc_freeaddrinfo_trampoline()
    62  
    63  func Freeaddrinfo(ai *Addrinfo) {
    64  	syscall_syscall6(abi.FuncPCABI0(libc_freeaddrinfo_trampoline),
    65  		uintptr(unsafe.Pointer(ai)),
    66  		0, 0, 0, 0, 0)
    67  }
    68  
    69  //go:cgo_import_dynamic libc_getnameinfo getnameinfo "/usr/lib/libSystem.B.dylib"
    70  func libc_getnameinfo_trampoline()
    71  
    72  func Getnameinfo(sa *syscall.RawSockaddr, salen int, host *byte, hostlen int, serv *byte, servlen int, flags int) (int, error) {
    73  	gerrno, _, errno := syscall_syscall9(abi.FuncPCABI0(libc_getnameinfo_trampoline),
    74  		uintptr(unsafe.Pointer(sa)),
    75  		uintptr(salen),
    76  		uintptr(unsafe.Pointer(host)),
    77  		uintptr(hostlen),
    78  		uintptr(unsafe.Pointer(serv)),
    79  		uintptr(servlen),
    80  		uintptr(flags),
    81  		0,
    82  		0)
    83  	var err error
    84  	if errno != 0 {
    85  		err = errno
    86  	}
    87  	return int(gerrno), err
    88  }
    89  
    90  //go:cgo_import_dynamic libc_gai_strerror gai_strerror "/usr/lib/libSystem.B.dylib"
    91  func libc_gai_strerror_trampoline()
    92  
    93  func GaiStrerror(ecode int) string {
    94  	r1, _, _ := syscall_syscall(abi.FuncPCABI0(libc_gai_strerror_trampoline),
    95  		uintptr(ecode),
    96  		0, 0)
    97  	return GoString((*byte)(unsafe.Pointer(r1)))
    98  }
    99  
   100  // Implemented in the runtime package.
   101  func gostring(*byte) string
   102  
   103  func GoString(p *byte) string {
   104  	return gostring(p)
   105  }
   106  
   107  //go:linkname syscall_syscall syscall.syscall
   108  func syscall_syscall(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno)
   109  
   110  //go:linkname syscall_syscallPtr syscall.syscallPtr
   111  func syscall_syscallPtr(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno)
   112  
   113  //go:linkname syscall_syscall6 syscall.syscall6
   114  func syscall_syscall6(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)
   115  
   116  //go:linkname syscall_syscall6X syscall.syscall6X
   117  func syscall_syscall6X(fn, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)
   118  
   119  //go:linkname syscall_syscall9 syscall.syscall9
   120  func syscall_syscall9(fn, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err syscall.Errno)
   121  
   122  type ResState struct {
   123  	unexported [69]uintptr
   124  }
   125  
   126  //go:cgo_import_dynamic libresolv_res_9_ninit res_9_ninit "/usr/lib/libresolv.9.dylib"
   127  func libresolv_res_9_ninit_trampoline()
   128  
   129  func ResNinit(state *ResState) error {
   130  	_, _, errno := syscall_syscall(abi.FuncPCABI0(libresolv_res_9_ninit_trampoline),
   131  		uintptr(unsafe.Pointer(state)),
   132  		0, 0)
   133  	if errno != 0 {
   134  		return errno
   135  	}
   136  	return nil
   137  }
   138  
   139  //go:cgo_import_dynamic libresolv_res_9_nclose res_9_nclose "/usr/lib/libresolv.9.dylib"
   140  func libresolv_res_9_nclose_trampoline()
   141  
   142  func ResNclose(state *ResState) {
   143  	syscall_syscall(abi.FuncPCABI0(libresolv_res_9_nclose_trampoline),
   144  		uintptr(unsafe.Pointer(state)),
   145  		0, 0)
   146  }
   147  
   148  //go:cgo_import_dynamic libresolv_res_9_nsearch res_9_nsearch "/usr/lib/libresolv.9.dylib"
   149  func libresolv_res_9_nsearch_trampoline()
   150  
   151  func ResNsearch(state *ResState, dname *byte, class, typ int, ans *byte, anslen int) (int, error) {
   152  	r1, _, errno := syscall_syscall6(abi.FuncPCABI0(libresolv_res_9_nsearch_trampoline),
   153  		uintptr(unsafe.Pointer(state)),
   154  		uintptr(unsafe.Pointer(dname)),
   155  		uintptr(class),
   156  		uintptr(typ),
   157  		uintptr(unsafe.Pointer(ans)),
   158  		uintptr(anslen))
   159  	if errno != 0 {
   160  		return 0, errno
   161  	}
   162  	return int(int32(r1)), nil
   163  }
   164
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