/** Fill <b>cell_out</b> with a correctly formatted version of the
* CREATED{,_FAST,2} cell in <b>cell_in</b>. Return 0 on success, -1 on
* failure. */
int
created_cell_format(cell_t *cell_out, const created_cell_t *cell_in)
{
if (check_created_cell(cell_in) < 0)
return -1;
memset(cell_out->payload, 0, sizeof(cell_out->payload));
cell_out->command = cell_in->cell_type;
switch (cell_in->cell_type) {
case CELL_CREATED:
case CELL_CREATED_FAST:
tor_assert(cell_in->handshake_len <= sizeof(cell_out->payload));
memcpy(cell_out->payload, cell_in->reply, cell_in->handshake_len);
break;
case CELL_CREATED2:
tor_assert(cell_in->handshake_len <= sizeof(cell_out->payload)-2);
set_uint16(cell_out->payload, htons(cell_in->handshake_len));
memcpy(cell_out->payload + 2, cell_in->reply, cell_in->handshake_len);
break;
default:
return -1;
}
return 0;
}
/** Parse a CREATED, CREATED_FAST, or CREATED2 cell from <b>cell_in</b> into
* <b>cell_out</b>. Return 0 on success, -1 on failure. */
int
created_cell_parse(created_cell_t *cell_out, const cell_t *cell_in)
{
memset(cell_out, 0, sizeof(*cell_out));
switch (cell_in->command) {
case CELL_CREATED:
cell_out->cell_type = CELL_CREATED;
cell_out->handshake_len = TAP_ONIONSKIN_REPLY_LEN;
memcpy(cell_out->reply, cell_in->payload, TAP_ONIONSKIN_REPLY_LEN);
break;
case CELL_CREATED_FAST:
cell_out->cell_type = CELL_CREATED_FAST;
cell_out->handshake_len = CREATED_FAST_LEN;
memcpy(cell_out->reply, cell_in->payload, CREATED_FAST_LEN);
break;
case CELL_CREATED2:
{
const uint8_t *p = cell_in->payload;
cell_out->cell_type = CELL_CREATED2;
cell_out->handshake_len = ntohs(get_uint16(p));
if (cell_out->handshake_len > CELL_PAYLOAD_SIZE - 2)
return -1;
memcpy(cell_out->reply, p+2, cell_out->handshake_len);
break;
}
}
return check_created_cell(cell_out);
}
/** Parse a CREATED, CREATED_FAST, or CREATED2 cell from <b>cell_in</b> into
* <b>cell_out</b>. Return 0 on success, -1 on failure. */
int
created_cell_parse(created_cell_t *cell_out, const cell_t *cell_in)
{
// printf("\nAsserting in created_cell_parse");
memmgr_assert((void*)cell_in);
memset(cell_out, 0, sizeof(cell_t));
int i;
switch (cell_in->command) {
case CELL_CREATED:
// printf("\ncreated cell t case 1");
cell_out->cell_type = CELL_CREATED;
cell_out->handshake_len = TAP_ONIONSKIN_REPLY_LEN;
for(i=0; i<TAP_ONIONSKIN_REPLY_LEN; i++){
cell_out->reply[i] = cell_in->payload[i];
}
// memcpy(cell_out->reply, cell_in->payload, TAP_ONIONSKIN_REPLY_LEN);
// printf("\ncreated cell t case 1 done");
break;
case CELL_CREATED_FAST:
// printf("\ncreated cell t case 2");
cell_out->cell_type = CELL_CREATED_FAST;
cell_out->handshake_len = CREATED_FAST_LEN;
for(i=0; i<CREATED_FAST_LEN; i++){
cell_out->reply[i] = cell_in->payload[i];
}
// memcpy(cell_out->reply, cell_in->payload, CREATED_FAST_LEN);
// printf("\ncreated cell t case 2 done");
break;
case CELL_CREATED2:
{
// printf("\ncreated cell t case 3");
const uint8_t *p = cell_in->payload;
cell_out->cell_type = CELL_CREATED2;
cell_out->handshake_len = ntohs(get_uint16(p));
if (cell_out->handshake_len > CELL_PAYLOAD_SIZE - 2)
return -1;
for(i=0; i<cell_out->handshake_len; i++){
cell_out->reply[i] = p[i+2];
}
// memcpy(cell_out->reply, p+2, cell_out->handshake_len);
// printf("\ncreated cell t case 3 done");
break;
}
}
return check_created_cell(cell_out);
}
/** Helper: return 0 if <b>cell</b> appears valid, -1 otherwise. */
static int
check_extended_cell(const extended_cell_t *cell)
{
if (cell->created_cell.cell_type == CELL_CREATED) {
if (cell->cell_type != RELAY_COMMAND_EXTENDED)
return -1;
} else if (cell->created_cell.cell_type == CELL_CREATED2) {
if (cell->cell_type != RELAY_COMMAND_EXTENDED2)
return -1;
} else {
return -1;
}
return check_created_cell(&cell->created_cell);
}