func GetGroupList(u *user.User) ([]string, error) {
var members []string
gid, err := strconv.Atoi(u.Gid)
if err != nil {
return nil, err
}
nameC := C.CString(u.Username)
defer C.free(unsafe.Pointer(nameC))
groupC := C.gid_t(gid)
ngroupsC := C.int(0)
C.mygetgrouplist(nameC, groupC, nil, &ngroupsC)
ngroups := int(ngroupsC)
groups := C.malloc(C.size_t(int(unsafe.Sizeof(groupC)) * ngroups))
defer C.free(groups)
rv := C.mygetgrouplist(nameC, groupC, (*C.gid_t)(groups), &ngroupsC)
if rv == -1 {
return nil, fmt.Errorf("user: membership of %s in %s: %s", u.Username, u.Gid, syscall.Errno(rv))
}
ngroups = int(ngroupsC)
for i := 0; i < ngroups; i++ {
gid := C.group_at(C.int(i), (*C.gid_t)(groups))
gidS := strconv.Itoa(int(gid))
group, err := LookupGroupID(gidS)
if err != nil {
return nil, err
}
members = append(members, group.Name)
}
return members, nil
}
func userInGroup(u *user.User, g *Group) (bool, error) {
if u.Gid == g.Gid {
return true, nil
}
gid, err := strconv.Atoi(g.Gid)
if err != nil {
return false, err
}
nameC := C.CString(u.Username)
defer C.free(unsafe.Pointer(nameC))
groupC := C.gid_t(gid)
ngroupsC := C.int(0)
C.mygetgrouplist(nameC, groupC, nil, &ngroupsC)
ngroups := int(ngroupsC)
groups := C.malloc(C.size_t(int(unsafe.Sizeof(groupC)) * ngroups))
defer C.free(groups)
rv := C.mygetgrouplist(nameC, groupC, (*C.gid_t)(groups), &ngroupsC)
if rv == -1 {
return false, fmt.Errorf("user: membership of %s in %s: %s", u.Username, g.Name, syscall.Errno(rv))
}
ngroups = int(ngroupsC)
for i := 0; i < ngroups; i++ {
gid := C.group_at(C.int(i), (*C.gid_t)(groups))
if g.Gid == strconv.Itoa(int(gid)) {
return true, nil
}
}
return false, nil
}