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/*
* Copyright (C) 2016 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Author: Benjamin Zeller <benjamin.zeller@canonical.com>
*/
package ubuntu_sdk_tools
/*
#define _GNU_SOURCE
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <stdlib.h>
#include <errno.h>
#include <grp.h>
#include <stdio.h>
#include <shadow.h>
char *getGrpMember (struct group *grp, size_t index)
{
if (grp == NULL) return NULL;
if (grp->gr_mem[index] == NULL)
return NULL;
return grp->gr_mem[index];
}
*/
import "C"
import (
"unsafe"
"fmt"
"syscall"
)
type Passwd struct {
Uid uint32
Gid uint32
Dir string
Shell string
LoginName string
}
func Getpwnam(username string) (*Passwd, error) {
var pwd C.struct_passwd
var result *C.struct_passwd
bufSize := C.sysconf(C._SC_GETPW_R_SIZE_MAX)
if bufSize <= 0 || bufSize > 1<<20 {
return nil, fmt.Errorf("unreasonable _SC_GETPW_R_SIZE_MAX of %d", bufSize)
}
buf := C.malloc(C.size_t(bufSize))
defer C.free(buf)
var rv C.int
nameC := C.CString(username)
defer C.free(unsafe.Pointer(nameC))
rv, err := C.getpwnam_r(nameC,
&pwd,
(*C.char)(buf),
C.size_t(bufSize),
&result)
if rv != 0 {
return nil, fmt.Errorf("error while looking up username %s: %s", username, syscall.Errno(rv))
}
if result == nil {
if err != nil {
return nil, err
}
return nil, fmt.Errorf("Unknown error while getting the user entry for %s", username)
}
return &Passwd{
Uid: uint32(pwd.pw_uid),
Gid: uint32(pwd.pw_uid),
Dir: C.GoString(pwd.pw_dir),
Shell: C.GoString(pwd.pw_shell),
LoginName: C.GoString(pwd.pw_name)}, nil
}
type GroupEntry struct {
Gid uint32
Name string
Members []string
}
func GetGroups() ([]GroupEntry, error){
var grp C.struct_group
var result *C.struct_group
allGroups := make([]GroupEntry, 0)
//_SC_GETGR_R_SIZE_MAX
bufSize := C.sysconf(C._SC_GETGR_R_SIZE_MAX)
if bufSize <= 0 || bufSize > 1<<20 {
return nil, fmt.Errorf("unreasonable _SC_GETPW_R_SIZE_MAX of %d", bufSize)
}
buf := C.malloc(C.size_t(bufSize))
defer C.free(buf)
for {
result = nil
res, err := C.getgrent_r(&grp, (*C.char)(buf), C.size_t(bufSize), &result)
if res != 0 {
if err != nil {
return nil, err
}
break
}
currEntry := GroupEntry{}
currEntry.Gid = uint32(result.gr_gid)
currEntry.Name = C.GoString(result.gr_name)
idx := 0
for {
cMember := C.getGrpMember(result, C.size_t(idx))
if cMember == nil {
break
}
currEntry.Members = append(currEntry.Members, C.GoString(cMember))
idx++
}
allGroups = append(allGroups, currEntry)
}
return allGroups, nil
}
type SPasswd struct {
Sp_namp string /* Login name */
Sp_pwdp string /* Encrypted password */
}
func Getspnam (username string) (*SPasswd, error) {
var spwd C.struct_spwd
var result *C.struct_spwd
bufSize := C.sysconf(C._SC_GETPW_R_SIZE_MAX)
if bufSize <= 0 || bufSize > 1<<20 {
return nil, fmt.Errorf("unreasonable _SC_GETPW_R_SIZE_MAX of %d", bufSize)
}
buf := C.malloc(C.size_t(bufSize))
defer C.free(buf)
var rv C.int
nameC := C.CString(username)
defer C.free(unsafe.Pointer(nameC))
rv, err := C.getspnam_r(nameC,
&spwd,
(*C.char)(buf),
C.size_t(bufSize),
&result)
if rv != 0 {
return nil, fmt.Errorf("error while looking up passwd for %s: %s", username, syscall.Errno(rv))
}
if result == nil {
if err != nil {
return nil, err
}
return nil, fmt.Errorf("Unknown error while getting the password entry for %s", username)
}
return &SPasswd{
Sp_namp:C.GoString(result.sp_namp),
Sp_pwdp:C.GoString(result.sp_pwdp),
}, nil
}
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