int
iscsi_pdu_add_data(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
unsigned char *dptr, int dsize)
{
if (pdu == NULL) {
iscsi_set_error(iscsi, "trying to add data to NULL pdu");
return -1;
}
if (dsize == 0) {
iscsi_set_error(iscsi, "Trying to append zero size data to "
"pdu");
return -1;
}
if (iscsi_add_data(iscsi, &pdu->outdata, dptr, dsize, 1) != 0) {
iscsi_set_error(iscsi, "failed to add data to pdu buffer");
return -1;
}
/* update data segment length */
*(uint32_t *)&pdu->outdata.data[4] = htonl(pdu->outdata.size
- ISCSI_HEADER_SIZE);
return 0;
}
int iscsi_process_scsi_data_in(struct iscsi_context *iscsi, struct iscsi_pdu *pdu, const unsigned char *hdr, int size, int *is_finished)
{
int statsn, flags, status;
struct iscsi_scsi_cbdata *scsi_cbdata = pdu->scsi_cbdata;
struct scsi_task *task = scsi_cbdata->task;
int dsl;
statsn = ntohl(*(uint32_t *)&hdr[24]);
if (statsn > (int)iscsi->statsn) {
iscsi->statsn = statsn;
}
flags = hdr[1];
if ((flags&ISCSI_PDU_DATA_ACK_REQUESTED) != 0) {
printf("scsi response asked for ACK 0x%02x\n", flags);
pdu->callback(iscsi, ISCSI_STATUS_ERROR, task, pdu->private_data);
return -1;
}
/* for now, we ignore all overflow/underflow flags. We just print/log them so we can tweak
* libiscsi to not generate under/over flows
*/
if ((flags&ISCSI_PDU_DATA_RESIDUAL_OVERFLOW) != 0) {
printf("scsi response contains residual overflow 0x%02x\n", flags);
}
if ((flags&ISCSI_PDU_DATA_RESIDUAL_UNDERFLOW) != 0) {
printf("scsi response contains residual underflow 0x%02x\n", flags);
}
dsl = ntohl(*(uint32_t *)&hdr[4])&0x00ffffff;
if (dsl > size - ISCSI_HEADER_SIZE) {
printf ("dsl is :%d, while buffser size if %d\n", dsl, size - ISCSI_HEADER_SIZE);
}
if (iscsi_add_data(&pdu->indata, discard_const(hdr + ISCSI_HEADER_SIZE), dsl, 0) != 0) {
printf("failed to add data to pdu in buffer\n");
return -3;
}
if ((flags&ISCSI_PDU_DATA_FINAL) == 0) {
printf("scsi data-in without Final bit: 0x%02x\n", flags);
*is_finished = 0;
}
if ((flags&ISCSI_PDU_DATA_CONTAINS_STATUS) == 0) {
printf("scsi data-in without Status bit: 0x%02x\n", flags);
*is_finished = 0;
}
if (*is_finished == 0) {
return 0;
}
/* this was the final data-in packet in the sequence and it has the s-bit set, so invoke the
* callback.
*/
status = hdr[3];
task->datain.data = pdu->indata.data;
task->datain.size = pdu->indata.size;
pdu->callback(iscsi, status, task, pdu->private_data);
return 0;
}