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//go:build linux && cgo && libsubid
// +build linux,cgo,libsubid
package idtools
import (
"errors"
"os/user"
"unsafe"
)
/*
#cgo LDFLAGS: -l subid
#include <shadow/subid.h>
#include <stdlib.h>
#include <stdio.h>
const char *Prog = "storage";
FILE *shadow_logfd = NULL;
struct subid_range get_range(struct subid_range *ranges, int i)
{
shadow_logfd = stderr;
return ranges[i];
}
#if !defined(SUBID_ABI_MAJOR) || (SUBID_ABI_MAJOR < 4)
# define subid_get_uid_ranges get_subuid_ranges
# define subid_get_gid_ranges get_subgid_ranges
#endif
*/
import "C"
func readSubid(username string, isUser bool) (ranges, error) {
var ret ranges
uidstr := ""
if username == "ALL" {
return nil, errors.New("username ALL not supported")
}
if u, err := user.Lookup(username); err == nil {
uidstr = u.Uid
}
cUsername := C.CString(username)
defer C.free(unsafe.Pointer(cUsername))
cuidstr := C.CString(uidstr)
defer C.free(unsafe.Pointer(cuidstr))
var nRanges C.int
var cRanges *C.struct_subid_range
if isUser {
nRanges = C.subid_get_uid_ranges(cUsername, &cRanges)
if nRanges <= 0 {
nRanges = C.subid_get_uid_ranges(cuidstr, &cRanges)
}
} else {
nRanges = C.subid_get_gid_ranges(cUsername, &cRanges)
if nRanges <= 0 {
nRanges = C.subid_get_gid_ranges(cuidstr, &cRanges)
}
}
if nRanges < 0 {
return nil, errors.New("cannot read subids")
}
defer C.free(unsafe.Pointer(cRanges))
for i := 0; i < int(nRanges); i++ {
r := C.get_range(cRanges, C.int(i))
newRange := subIDRange{
Start: int(r.start),
Length: int(r.count),
}
ret = append(ret, newRange)
}
return ret, nil
}
func readSubuid(username string) (ranges, error) {
return readSubid(username, true)
}
func readSubgid(username string) (ranges, error) {
return readSubid(username, false)
}
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