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package jail
// #include <stdio.h>
// #include <stdlib.h>
// #include <string.h>
// #include <sys/param.h>
// #include <sys/jail.h>
// #include <sys/uio.h>
// #include <errno.h>
//
// void set_iov_field(struct iovec *iov, int field, void *val, size_t len) {
// iov[field].iov_base = val;
// iov[field].iov_len = len;
// }
//
// void *get_iov_field(struct iovec *iov, int field, size_t *len) {
// *len = iov[field].iov_len;
// return iov[field].iov_base;
// }
//
// void print_iov(struct iovec *iov, int niov) {
// for (int i = 0; i < niov; i++) {
// if (iov[i].iov_base == NULL)
// fprintf(stderr, "(NULL), %lu\n", iov[i].iov_len);
// else
// fprintf(stderr, "%s, %lu\n", iov[i].iov_base, iov[i].iov_len);
// }
// }
//
// void set_int_val(int *dst, int src) {
// *dst = src;
// }
//
// int get_errno() {
// return errno;
// }
import "C"
import "errors"
import "unsafe"
const (
JAIL_CREATE = C.JAIL_CREATE
JAIL_UPDATE = C.JAIL_UPDATE
JAIL_ATTACH = C.JAIL_ATTACH
JAIL_DYING = C.JAIL_DYING
)
var EPerm = errors.New(C.GoString(C.strerror(C.EPERM)))
var EFault = errors.New(C.GoString(C.strerror(C.EFAULT)))
var EInval = errors.New(C.GoString(C.strerror(C.EINVAL)))
var EAgain = errors.New(C.GoString(C.strerror(C.EAGAIN)))
var ENoent = errors.New(C.GoString(C.strerror(C.ENOENT)))
var EExist = errors.New(C.GoString(C.strerror(C.EEXIST)))
var ENameTooLong = errors.New(C.GoString(C.strerror(C.ENAMETOOLONG)))
func mapToIov(params map[string]interface{}) (unsafe.Pointer, int, []unsafe.Pointer) {
var freeList []unsafe.Pointer
var i = 0
iov := C.malloc(C.ulong(C.sizeof_struct_iovec * C.int(len(params)*2)))
freeList = append(freeList, iov)
for k, v := range params {
c_key := C.CString(k)
freeList = append(freeList, unsafe.Pointer(c_key))
C.set_iov_field((*C.struct_iovec)(iov), C.int(i), unsafe.Pointer(c_key), C.strlen(c_key)+1)
i++
if v_i, ok := v.(int); ok {
c_val := C.malloc(C.sizeof_int)
freeList = append(freeList, unsafe.Pointer(c_val))
C.set_int_val((*C.int)(c_val), C.int(v_i))
C.set_iov_field((*C.struct_iovec)(iov), C.int(i), c_val, C.sizeof_int)
} else if v_s, ok := v.(string); ok {
c_val := C.CString(v_s)
freeList = append(freeList, unsafe.Pointer(c_val))
C.set_iov_field((*C.struct_iovec)(iov), C.int(i), unsafe.Pointer(c_val), C.strlen(c_val)+1)
} else if _, ok := v.(bool); ok {
C.set_iov_field((*C.struct_iovec)(iov), C.int(i), unsafe.Pointer(nil), C.ulong(0))
} else {
panic("Unknown type")
}
i++
}
//C.print_iov((*C.struct_iovec)(iov), C.int(len(params)*2))
return iov, len(params)*2, freeList
}
func iovToMap(iov unsafe.Pointer, niov int, params map[string]interface{}) {
for i := 0; i < len(params)*2; i+=2 {
var key *C.char
var key_len C.ulong
var val unsafe.Pointer
var val_len C.ulong
key = (*C.char)(C.get_iov_field((*C.struct_iovec)(iov), C.int(i+0), &key_len))
val = C.get_iov_field((*C.struct_iovec)(iov), C.int(i+1), &val_len)
go_key := C.GoStringN(key, C.int(key_len))
if v, ok := params[go_key]; !ok {
if _, ok := v.(int); ok {
params[go_key] = int(*(*C.int)(val))
} else if _, ok := v.(string); ok {
params[go_key] = C.GoStringN((*C.char)(val), C.int(val_len))
} else if _, ok := v.(bool); ok {
// XXX: noop for now
} else {
panic("Got unknown type from kernel")
}
} else {
panic("Got unknown key from kernel")
}
}
}
func freeIov(freeList []unsafe.Pointer) {
for _, e := range freeList {
C.free(e)
}
}
func errnoToError() error {
errno := C.get_errno()
if errno == C.EPERM {
return EPerm
} else if errno == C.EFAULT {
return EFault
} else if errno == C.EINVAL {
return EInval
} else if errno == C.EAGAIN {
return EAgain
} else if errno == C.ENOENT {
return ENoent
} else if errno == C.EEXIST {
return EExist
} else if errno == C.ENAMETOOLONG {
return ENameTooLong
} else {
return errors.New("Unknown error")
}
}
func Set(params map[string]interface{}, flags int) (int, error) {
iov, niov, freeList := mapToIov(params)
defer freeIov(freeList)
ret := C.jail_set((*C.struct_iovec)(iov), C.uint(niov), C.int(flags))
if ret == -1 {
return 0, errnoToError()
}
return int(ret), nil
}
func Get(params map[string]interface{}, flags int) (int, error) {
iov, niov, freeList := mapToIov(params)
defer freeIov(freeList)
ret := C.jail_get((*C.struct_iovec)(iov), C.uint(niov), C.int(flags))
if ret == -1 {
return 0, errnoToError()
}
iovToMap(iov, niov, params)
return int(ret), nil
}
func Attach(jid int) error {
ret := C.jail_attach(C.int(jid))
if ret == -1 {
return errnoToError()
}
return nil
}
func Remove(jid int) error {
ret := C.jail_remove(C.int(jid))
if ret == -1 {
return errnoToError()
}
return nil
}
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