1 // Copyright 2016 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 // +build dragonfly freebsd !android,linux netbsd openbsd 6 7 package user 8 9 /* 10 #include <unistd.h> 11 #include <sys/types.h> 12 #include <grp.h> 13 14 static int mygetgrouplist(const char* user, gid_t group, gid_t* groups, int* ngroups) { 15 return getgrouplist(user, group, groups, ngroups); 16 } 17 */ 18 import "C" 19 import ( 20 "fmt" 21 "unsafe" 22 ) 23 24 func getGroupList(name *C.char, userGID C.gid_t, gids *C.gid_t, n *C.int) C.int { 25 return C.mygetgrouplist(name, userGID, gids, n) 26 } 27 28 // groupRetry retries getGroupList with much larger size for n. The result is 29 // stored in gids. 30 func groupRetry(username string, name []byte, userGID C.gid_t, gids *[]C.gid_t, n *C.int) error { 31 // More than initial buffer, but now n contains the correct size. 32 if *n > maxGroups { 33 return fmt.Errorf("user: %q is a member of more than %d groups", username, maxGroups) 34 } 35 *gids = make([]C.gid_t, *n) 36 rv := getGroupList((*C.char)(unsafe.Pointer(&name[0])), userGID, &(*gids)[0], n) 37 if rv == -1 { 38 return fmt.Errorf("user: list groups for %s failed", username) 39 } 40 return nil 41 } 42
