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sg_cmds_basic2.c
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/*
* Copyright (c) 1999-2023 Douglas Gilbert.
* All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the BSD_LICENSE file.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
/*
* CONTENTS
* Some SCSI commands are executed in many contexts and hence began
* to appear in several sg3_utils utilities. This files centralizes
* some of the low level command execution code. In most cases the
* interpretation of the command response is left to the each
* utility.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "sg_lib.h"
#include "sg_cmds_basic.h"
#include "sg_pt.h"
#include "sg_unaligned.h"
#include "sg_pr2serr.h"
#define SENSE_BUFF_LEN 64 /* Arbitrary, could be larger */
#define EBUFF_SZ 256
#define DEF_PT_TIMEOUT 60 /* 60 seconds */
#define START_PT_TIMEOUT 120 /* 120 seconds == 2 minutes */
#define LONG_PT_TIMEOUT 7200 /* 7,200 seconds == 120 minutes */
#define SYNCHRONIZE_CACHE_CMD 0x35
#define SYNCHRONIZE_CACHE_CMDLEN 10
#define SERVICE_ACTION_IN_16_CMD 0x9e
#define SERVICE_ACTION_IN_16_CMDLEN 16
#define READ_CAPACITY_16_SA 0x10
#define READ_CAPACITY_10_CMD 0x25
#define READ_CAPACITY_10_CMDLEN 10
#define MODE_SENSE6_CMD 0x1a
#define MODE_SENSE6_CMDLEN 6
#define MODE_SENSE10_CMD 0x5a
#define MODE_SENSE10_CMDLEN 10
#define MODE_SELECT6_CMD 0x15
#define MODE_SELECT6_CMDLEN 6
#define MODE_SELECT10_CMD 0x55
#define MODE_SELECT10_CMDLEN 10
#define LOG_SENSE_CMD 0x4d
#define LOG_SENSE_CMDLEN 10
#define LOG_SELECT_CMD 0x4c
#define LOG_SELECT_CMDLEN 10
#define START_STOP_CMD 0x1b
#define START_STOP_CMDLEN 6
#define PREVENT_ALLOW_CMD 0x1e
#define PREVENT_ALLOW_CMDLEN 6
#define MODE6_RESP_HDR_LEN 4
#define MODE10_RESP_HDR_LEN 8
#define MODE_RESP_ARB_LEN 8192
#define INQUIRY_RESP_INITIAL_LEN 36
static struct sg_pt_base *
create_pt_obj(const char * cname)
{
struct sg_pt_base * ptvp = construct_scsi_pt_obj();
if (NULL == ptvp)
pr2ws("%s: out of memory\n", cname);
return ptvp;
}
/* Invokes a SCSI SYNCHRONIZE CACHE (10) command. Return of 0 -> success,
* various SG_LIB_CAT_* positive values or -1 -> other errors */
int
sg_ll_sync_cache_10(int sg_fd, bool sync_nv, bool immed, int group,
unsigned int lba, unsigned int count, bool noisy,
int verbose)
{
static const char * const cdb_s = "synchronize cache(10)";
int res, ret, sense_cat;
uint8_t sc_cdb[SYNCHRONIZE_CACHE_CMDLEN] =
{SYNCHRONIZE_CACHE_CMD, 0, 0, 0, 0, 0, 0, 0, 0, 0};
uint8_t sense_b[SENSE_BUFF_LEN] SG_C_CPP_ZERO_INIT;
struct sg_pt_base * ptvp;
if (sync_nv)
sc_cdb[1] |= 4;
if (immed)
sc_cdb[1] |= 2;
sg_put_unaligned_be32((uint32_t)lba, sc_cdb + 2);
sc_cdb[6] = group & GRPNUM_MASK;
if (count > 0xffff) {
pr2ws("count too big\n");
return -1;
}
sg_put_unaligned_be16((int16_t)count, sc_cdb + 7);
if (verbose) {
char b[128];
pr2ws(" %s cdb: %s\n", cdb_s,
sg_get_command_str(sc_cdb, SYNCHRONIZE_CACHE_CMDLEN, false,
sizeof(b), b));
}
if (NULL == ((ptvp = create_pt_obj(cdb_s))))
return -1;
set_scsi_pt_cdb(ptvp, sc_cdb, sizeof(sc_cdb));
set_scsi_pt_sense(ptvp, sense_b, sizeof(sense_b));
res = do_scsi_pt(ptvp, sg_fd, DEF_PT_TIMEOUT, verbose);
ret = sg_cmds_process_resp(ptvp, cdb_s, res, noisy, verbose, &sense_cat);
if (-1 == ret) {
if (get_scsi_pt_transport_err(ptvp))
ret = SG_LIB_TRANSPORT_ERROR;
else
ret = sg_convert_errno(get_scsi_pt_os_err(ptvp));
} else if (-2 == ret) {
switch (sense_cat) {
case SG_LIB_CAT_RECOVERED:
case SG_LIB_CAT_NO_SENSE:
ret = 0;
break;
default:
ret = sense_cat;
break;
}
} else
ret = 0;
destruct_scsi_pt_obj(ptvp);
return ret;
}
/* Invokes a SCSI READ CAPACITY (16) command. Returns 0 -> success,
* various SG_LIB_CAT_* positive values or -1 -> other errors */
int
sg_ll_readcap_16(int sg_fd, bool pmi, uint64_t llba, void * resp,
int mx_resp_len, bool noisy, int verbose)
{
static const char * const cdb_s = "read capacity(16)";
int ret, res, sense_cat;
uint8_t rc_cdb[SERVICE_ACTION_IN_16_CMDLEN] =
{SERVICE_ACTION_IN_16_CMD, READ_CAPACITY_16_SA,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
uint8_t sense_b[SENSE_BUFF_LEN] SG_C_CPP_ZERO_INIT;
struct sg_pt_base * ptvp;
if (pmi) { /* lbs only valid when pmi set */
rc_cdb[14] |= 1;
sg_put_unaligned_be64(llba, rc_cdb + 2);
}
/* Allocation length, no guidance in SBC-2 rev 15b */
sg_put_unaligned_be32((uint32_t)mx_resp_len, rc_cdb + 10);
if (verbose) {
char b[128];
pr2ws(" %s cdb: %s\n", cdb_s,
sg_get_command_str(rc_cdb, SERVICE_ACTION_IN_16_CMDLEN, false,
sizeof(b), b));
}
if (NULL == ((ptvp = create_pt_obj(cdb_s))))
return -1;
set_scsi_pt_cdb(ptvp, rc_cdb, sizeof(rc_cdb));
set_scsi_pt_sense(ptvp, sense_b, sizeof(sense_b));
set_scsi_pt_data_in(ptvp, (uint8_t *)resp, mx_resp_len);
res = do_scsi_pt(ptvp, sg_fd, DEF_PT_TIMEOUT, verbose);
ret = sg_cmds_process_resp(ptvp, cdb_s, res, noisy, verbose, &sense_cat);
if (-1 == ret) {
if (get_scsi_pt_transport_err(ptvp))
ret = SG_LIB_TRANSPORT_ERROR;
else
ret = sg_convert_errno(get_scsi_pt_os_err(ptvp));
} else if (-2 == ret) {
switch (sense_cat) {
case SG_LIB_CAT_RECOVERED:
case SG_LIB_CAT_NO_SENSE:
ret = 0;
break;
default:
ret = sense_cat;
break;
}
} else
ret = 0;
destruct_scsi_pt_obj(ptvp);
return ret;
}
/* Invokes a SCSI READ CAPACITY (10) command. Returns 0 -> success,
* various SG_LIB_CAT_* positive values or -1 -> other errors */
int
sg_ll_readcap_10(int sg_fd, bool pmi, unsigned int lba, void * resp,
int mx_resp_len, bool noisy, int verbose)
{
static const char * const cdb_s = "read capacity(10)";
int ret, res, sense_cat;
uint8_t rc_cdb[READ_CAPACITY_10_CMDLEN] =
{READ_CAPACITY_10_CMD, 0, 0, 0, 0, 0, 0, 0, 0, 0};
uint8_t sense_b[SENSE_BUFF_LEN] SG_C_CPP_ZERO_INIT;
struct sg_pt_base * ptvp;
if (pmi) { /* lbs only valid when pmi set */
rc_cdb[8] |= 1;
sg_put_unaligned_be32((uint32_t)lba, rc_cdb + 2);
}
if (verbose) {
char b[128];
pr2ws(" %s cdb: %s\n", cdb_s,
sg_get_command_str(rc_cdb, READ_CAPACITY_10_CMDLEN, false,
sizeof(b), b));
}
if (NULL == ((ptvp = create_pt_obj(cdb_s))))
return -1;
set_scsi_pt_cdb(ptvp, rc_cdb, sizeof(rc_cdb));
set_scsi_pt_sense(ptvp, sense_b, sizeof(sense_b));
set_scsi_pt_data_in(ptvp, (uint8_t *)resp, mx_resp_len);
res = do_scsi_pt(ptvp, sg_fd, DEF_PT_TIMEOUT, verbose);
ret = sg_cmds_process_resp(ptvp, cdb_s, res, noisy, verbose, &sense_cat);
if (-1 == ret) {
if (get_scsi_pt_transport_err(ptvp))
ret = SG_LIB_TRANSPORT_ERROR;
else
ret = sg_convert_errno(get_scsi_pt_os_err(ptvp));
} else if (-2 == ret) {
switch (sense_cat) {
case SG_LIB_CAT_RECOVERED:
case SG_LIB_CAT_NO_SENSE:
ret = 0;
break;
default:
ret = sense_cat;
break;
}
} else
ret = 0;
destruct_scsi_pt_obj(ptvp);
return ret;
}
/* Invokes a SCSI MODE SENSE (6) command. Return of 0 -> success,
* various SG_LIB_CAT_* positive values or -1 -> other errors */
int
sg_ll_mode_sense6(int sg_fd, bool dbd, int pc, int pg_code, int sub_pg_code,
void * resp, int mx_resp_len, bool noisy, int verbose)
{
static const char * const cdb_s = "mode sense(6)";
int res, ret, sense_cat, resid;
uint8_t modes_cdb[MODE_SENSE6_CMDLEN] =
{MODE_SENSE6_CMD, 0, 0, 0, 0, 0};
uint8_t sense_b[SENSE_BUFF_LEN] SG_C_CPP_ZERO_INIT;
struct sg_pt_base * ptvp;
modes_cdb[1] = (uint8_t)(dbd ? 0x8 : 0);
modes_cdb[2] = (uint8_t)(((pc << 6) & 0xc0) | (pg_code & 0x3f));
modes_cdb[3] = (uint8_t)(sub_pg_code & 0xff);
modes_cdb[4] = (uint8_t)(mx_resp_len & 0xff);
if (mx_resp_len > 0xff) {
pr2ws("mx_resp_len too big\n");
return -1;
}
if (verbose) {
char b[128];
pr2ws(" %s cdb: %s\n", cdb_s,
sg_get_command_str(modes_cdb, MODE_SENSE6_CMDLEN, false,
sizeof(b), b));
}
if (NULL == ((ptvp = create_pt_obj(cdb_s))))
return -1;
set_scsi_pt_cdb(ptvp, modes_cdb, sizeof(modes_cdb));
set_scsi_pt_sense(ptvp, sense_b, sizeof(sense_b));
set_scsi_pt_data_in(ptvp, (uint8_t *)resp, mx_resp_len);
res = do_scsi_pt(ptvp, sg_fd, DEF_PT_TIMEOUT, verbose);
ret = sg_cmds_process_resp(ptvp, cdb_s, res, noisy, verbose, &sense_cat);
resid = get_scsi_pt_resid(ptvp);
if (-1 == ret) {
if (get_scsi_pt_transport_err(ptvp))
ret = SG_LIB_TRANSPORT_ERROR;
else
ret = sg_convert_errno(get_scsi_pt_os_err(ptvp));
} else if (-2 == ret) {
switch (sense_cat) {
case SG_LIB_CAT_RECOVERED:
case SG_LIB_CAT_NO_SENSE:
ret = 0;
break;
default:
ret = sense_cat;
break;
}
} else {
if ((verbose > 2) && (ret > 0)) {
pr2ws(" %s: response", cdb_s);
if (3 == verbose) {
pr2ws("%s:\n", (ret > 256 ? ", first 256 bytes" : ""));
hex2stderr((const uint8_t *)resp, (ret > 256 ? 256 : ret),
-1);
} else {
pr2ws(":\n");
hex2stderr((const uint8_t *)resp, ret, 0);
}
}
ret = 0;
}
destruct_scsi_pt_obj(ptvp);
if (resid > 0) {
if (resid > mx_resp_len) {
pr2ws("%s: resid (%d) should never exceed requested len=%d\n",
cdb_s, resid, mx_resp_len);
return ret ? ret : SG_LIB_CAT_MALFORMED;
}
/* zero unfilled section of response buffer */
memset((uint8_t *)resp + (mx_resp_len - resid), 0, resid);
}
return ret;
}
/* Invokes a SCSI MODE SENSE (10) command. Return of 0 -> success,
* various SG_LIB_CAT_* positive values or -1 -> other errors */
int
sg_ll_mode_sense10(int sg_fd, bool llbaa, bool dbd, int pc, int pg_code,
int sub_pg_code, void * resp, int mx_resp_len,
bool noisy, int verbose)
{
return sg_ll_mode_sense10_v2(sg_fd, llbaa, dbd, pc, pg_code, sub_pg_code,
resp, mx_resp_len, 0, NULL, noisy, verbose);
}
/* Invokes a SCSI MODE SENSE (10) command. Return of 0 -> success,
* various SG_LIB_CAT_* positive values or -1 -> other errors.
* Adds the ability to set the command abort timeout
* and the ability to report the residual count. If timeout_secs is zero
* or less the default command abort timeout (60 seconds) is used.
* If residp is non-NULL then the residual value is written where residp
* points. A residual value of 0 implies mx_resp_len bytes have be written
* where resp points. If the residual value equals mx_resp_len then no
* bytes have been written. */
int
sg_ll_mode_sense10_v2(int sg_fd, bool llbaa, bool dbd, int pc, int pg_code,
int sub_pg_code, void * resp, int mx_resp_len,
int timeout_secs, int * residp, bool noisy, int verbose)
{
int res, ret, sense_cat, resid;
static const char * const cdb_s = "mode sense(10)";
struct sg_pt_base * ptvp;
uint8_t modes_cdb[MODE_SENSE10_CMDLEN] =
{MODE_SENSE10_CMD, 0, 0, 0, 0, 0, 0, 0, 0, 0};
uint8_t sense_b[SENSE_BUFF_LEN] SG_C_CPP_ZERO_INIT;
modes_cdb[1] = (uint8_t)((dbd ? 0x8 : 0) | (llbaa ? 0x10 : 0));
modes_cdb[2] = (uint8_t)(((pc << 6) & 0xc0) | (pg_code & 0x3f));
modes_cdb[3] = (uint8_t)(sub_pg_code & 0xff);
sg_put_unaligned_be16((int16_t)mx_resp_len, modes_cdb + 7);
if (mx_resp_len > 0xffff) {
pr2ws("mx_resp_len too big\n");
goto gen_err;
}
if (verbose) {
char b[128];
pr2ws(" %s cdb: %s\n", cdb_s,
sg_get_command_str(modes_cdb, MODE_SENSE10_CMDLEN, false,
sizeof(b), b));
}
if (timeout_secs <= 0)
timeout_secs = DEF_PT_TIMEOUT;
if (NULL == ((ptvp = create_pt_obj(cdb_s))))
goto gen_err;
set_scsi_pt_cdb(ptvp, modes_cdb, sizeof(modes_cdb));
set_scsi_pt_sense(ptvp, sense_b, sizeof(sense_b));
set_scsi_pt_data_in(ptvp, (uint8_t *)resp, mx_resp_len);
res = do_scsi_pt(ptvp, sg_fd, timeout_secs, verbose);
ret = sg_cmds_process_resp(ptvp, cdb_s, res, noisy, verbose, &sense_cat);
resid = get_scsi_pt_resid(ptvp);
if (residp)
*residp = resid;
if (-1 == ret) {
if (get_scsi_pt_transport_err(ptvp))
ret = SG_LIB_TRANSPORT_ERROR;
else
ret = sg_convert_errno(get_scsi_pt_os_err(ptvp));
} else if (-2 == ret) {
switch (sense_cat) {
case SG_LIB_CAT_RECOVERED:
case SG_LIB_CAT_NO_SENSE:
ret = 0;
break;
default:
ret = sense_cat;
break;
}
} else {
if ((verbose > 2) && (ret > 0)) {
pr2ws(" %s: response", cdb_s);
if (3 == verbose) {
pr2ws("%s:\n", (ret > 256 ? ", first 256 bytes" : ""));
hex2stderr((const uint8_t *)resp, (ret > 256 ? 256 : ret),
-1);
} else {
pr2ws(":\n");
hex2stderr((const uint8_t *)resp, ret, 0);
}
}
ret = 0;
}
destruct_scsi_pt_obj(ptvp);
if (resid > 0) {
if (resid > mx_resp_len) {
pr2ws("%s: resid (%d) should never exceed requested len=%d\n",
cdb_s, resid, mx_resp_len);
return ret ? ret : SG_LIB_CAT_MALFORMED;
}
/* zero unfilled section of response buffer */
memset((uint8_t *)resp + (mx_resp_len - resid), 0, resid);
}
return ret;
gen_err:
if (residp)
*residp = 0;
return -1;
}
/* Invokes a SCSI MODE SELECT (6) command. Return of 0 -> success,
* various SG_LIB_CAT_* positive values or -1 -> other errors */
int
sg_ll_mode_select6_v2(int sg_fd, bool pf, bool rtd, bool sp, void * paramp,
int param_len, bool noisy, int verbose)
{
static const char * const cdb_s = "mode select(6)";
int res, ret, sense_cat;
uint8_t modes_cdb[MODE_SELECT6_CMDLEN] =
{MODE_SELECT6_CMD, 0, 0, 0, 0, 0};
uint8_t sense_b[SENSE_BUFF_LEN] SG_C_CPP_ZERO_INIT;
struct sg_pt_base * ptvp;
modes_cdb[1] = (uint8_t)((pf ? 0x10 : 0x0) | (sp ? 0x1 : 0x0));
if (rtd)
modes_cdb[1] |= 0x2;
modes_cdb[4] = (uint8_t)(param_len & 0xff);
if (param_len > 0xff) {
pr2ws("%s: param_len too big\n", cdb_s);
return -1;
}
if (verbose) {
char b[128];
pr2ws(" %s cdb: %s\n", cdb_s,
sg_get_command_str(modes_cdb, MODE_SELECT6_CMDLEN, false,
sizeof(b), b));
}
if (verbose > 1) {
pr2ws(" %s parameter list\n", cdb_s);
hex2stderr((const uint8_t *)paramp, param_len, -1);
}
if (NULL == ((ptvp = create_pt_obj(cdb_s))))
return -1;
set_scsi_pt_cdb(ptvp, modes_cdb, sizeof(modes_cdb));
set_scsi_pt_sense(ptvp, sense_b, sizeof(sense_b));
set_scsi_pt_data_out(ptvp, (uint8_t *)paramp, param_len);
res = do_scsi_pt(ptvp, sg_fd, DEF_PT_TIMEOUT, verbose);
ret = sg_cmds_process_resp(ptvp, cdb_s, res, noisy, verbose, &sense_cat);
if (-1 == ret) {
if (get_scsi_pt_transport_err(ptvp))
ret = SG_LIB_TRANSPORT_ERROR;
else
ret = sg_convert_errno(get_scsi_pt_os_err(ptvp));
} else if (-2 == ret) {
switch (sense_cat) {
case SG_LIB_CAT_RECOVERED:
case SG_LIB_CAT_NO_SENSE:
ret = 0;
break;
default:
ret = sense_cat;
break;
}
} else
ret = 0;
destruct_scsi_pt_obj(ptvp);
return ret;
}
int
sg_ll_mode_select6(int sg_fd, bool pf, bool sp, void * paramp, int param_len,
bool noisy, int verbose)
{
return sg_ll_mode_select6_v2(sg_fd, pf, false, sp, paramp, param_len,
noisy, verbose);
}
/* Invokes a SCSI MODE SELECT (10) command. Return of 0 -> success,
* various SG_LIB_CAT_* positive values or -1 -> other errors,
* v2 adds rtd (revert to defaults) bit (spc5r11). */
int
sg_ll_mode_select10_v2(int sg_fd, bool pf, bool rtd, bool sp, void * paramp,
int param_len, bool noisy, int verbose)
{
static const char * const cdb_s = "mode select(10)";
int res, ret, sense_cat;
uint8_t modes_cdb[MODE_SELECT10_CMDLEN] =
{MODE_SELECT10_CMD, 0, 0, 0, 0, 0, 0, 0, 0, 0};
uint8_t sense_b[SENSE_BUFF_LEN] SG_C_CPP_ZERO_INIT;
struct sg_pt_base * ptvp;
modes_cdb[1] = (uint8_t)((pf ? 0x10 : 0x0) | (sp ? 0x1 : 0x0));
if (rtd)
modes_cdb[1] |= 0x2;
sg_put_unaligned_be16((int16_t)param_len, modes_cdb + 7);
if (param_len > 0xffff) {
pr2ws("%s: param_len too big\n", cdb_s);
return -1;
}
if (verbose) {
char b[128];
pr2ws(" %s cdb: %s\n", cdb_s,
sg_get_command_str(modes_cdb, MODE_SELECT10_CMDLEN, false,
sizeof(b), b));
}
if (verbose > 1) {
pr2ws(" %s parameter list\n", cdb_s);
hex2stderr((const uint8_t *)paramp, param_len, -1);
}
if (NULL == ((ptvp = create_pt_obj(cdb_s))))
return -1;
set_scsi_pt_cdb(ptvp, modes_cdb, sizeof(modes_cdb));
set_scsi_pt_sense(ptvp, sense_b, sizeof(sense_b));
set_scsi_pt_data_out(ptvp, (uint8_t *)paramp, param_len);
res = do_scsi_pt(ptvp, sg_fd, DEF_PT_TIMEOUT, verbose);
ret = sg_cmds_process_resp(ptvp, cdb_s, res, noisy, verbose, &sense_cat);
if (-1 == ret) {
if (get_scsi_pt_transport_err(ptvp))
ret = SG_LIB_TRANSPORT_ERROR;
else
ret = sg_convert_errno(get_scsi_pt_os_err(ptvp));
} else if (-2 == ret) {
switch (sense_cat) {
case SG_LIB_CAT_RECOVERED:
case SG_LIB_CAT_NO_SENSE:
ret = 0;
break;
default:
ret = sense_cat;
break;
}
} else
ret = 0;
destruct_scsi_pt_obj(ptvp);
return ret;
}
int
sg_ll_mode_select10(int sg_fd, bool pf, bool sp, void * paramp,
int param_len, bool noisy, int verbose)
{
return sg_ll_mode_select10_v2(sg_fd, pf, false, sp, paramp, param_len,
noisy, verbose);
}
/* MODE SENSE commands yield a response that has header then zero or more
* block descriptors followed by mode pages. In most cases users are
* interested in the first mode page. This function returns the (byte)
* offset of the start of the first mode page. Set mode_sense_6 to true for
* MODE SENSE (6) and false for MODE SENSE (10). Returns >= 0 is successful
* or -1 if failure. If there is a failure a message is written to err_buff
* if it is non-NULL and err_buff_len > 0. */
int
sg_mode_page_offset(const uint8_t * resp, int resp_len,
bool mode_sense_6, char * err_buff, int err_buff_len)
{
int bd_len, calc_len, offset;
bool err_buff_ok = ((err_buff_len > 0) && err_buff);
if ((NULL == resp) || (resp_len < 4))
goto too_short;
if (mode_sense_6) {
calc_len = resp[0] + 1;
bd_len = resp[3];
offset = bd_len + MODE6_RESP_HDR_LEN;
} else { /* Mode sense(10) */
if (resp_len < 8)
goto too_short;
calc_len = sg_get_unaligned_be16(resp) + 2;
bd_len = sg_get_unaligned_be16(resp + 6);
/* LongLBA doesn't change this calculation */
offset = bd_len + MODE10_RESP_HDR_LEN;
}
if ((offset + 2) > calc_len) {
if (err_buff_ok)
snprintf(err_buff, err_buff_len, "calculated response "
"length too small, offset=%d calc_len=%d bd_len=%d\n",
offset, calc_len, bd_len);
offset = -1;
}
return offset;
too_short:
if (err_buff_ok)
snprintf(err_buff, err_buff_len, "given MS(%d) response length (%d) "
"too short\n", (mode_sense_6 ? 6 : 10), resp_len);
return -1;
}
/* MODE SENSE commands yield a response that has header then zero or more
* block descriptors followed by mode pages. This functions returns the
* length (in bytes) of those three components. Note that the return value
* can exceed resp_len in which case the MODE SENSE command should be
* re-issued with a larger response buffer. If bd_lenp is non-NULL and if
* successful the block descriptor length (in bytes) is written to *bd_lenp.
* Set mode_sense_6 to true for MODE SENSE (6) and false for MODE SENSE (10)
* responses. Returns -1 if there is an error (e.g. response too short). */
int
sg_msense_calc_length(const uint8_t * resp, int resp_len,
bool mode_sense_6, int * bd_lenp)
{
int calc_len;
if (NULL == resp)
goto an_err;
if (mode_sense_6) {
if (resp_len < 4)
goto an_err;
calc_len = resp[0] + 1;
} else {
if (resp_len < 8)
goto an_err;
calc_len = sg_get_unaligned_be16(resp + 0) + 2;
}
if (bd_lenp)
*bd_lenp = mode_sense_6 ? resp[3] : sg_get_unaligned_be16(resp + 6);
return calc_len;
an_err:
if (bd_lenp)
*bd_lenp = 0;
return -1;
}
/* Fetches current, changeable, default and/or saveable mode pages (note:
* _only_ mode pages) as indicated by pcontrol_arr for given pg_code and
* sub_pg_code. If mode6 is true then use MODE SENSE (6) else use MODE SENSE
* (10). If flexible true and mode data length seems wrong then try and fix
* (compensating hack for bad device or driver). pcontrol_arr should have 4
* elements for output of current, changeable, default and saved values
* respectively. Each element should be NULL or a pointer to memory that is
* at least mx_mpage_len bytes long. The length of the fetched mode page
* (or pages) is written to the reported_lenp pointer, if it is non-NULL.
* That should be the length written to each pointer within pcontrol_arr .
* If success_mask pointer is not NULL then first zeros it. Then set bits
* 0, 1, 2 and/or 3 if the current, changeable, default and saved values
* respectively have been fetched. Returns 0 if overall success, otherwise
* a SG_LIB_CAT type error is returned or -1 for an uncategorized error.
* If error on current page then stops and returns that error; otherwise
* continues if an error is detected, returning the first error encountered.
* So if the saved page control is not supported, for example, then 7 is
* written to *smask and SG_LIB_CAT_ILLEGAL_REQ is returned. */
int
sg_get_mode_page_controls(int sg_fd, bool mode6, int pg_code, int sub_pg_code,
bool dbd, bool flexible, int mx_mpage_len,
int * success_mask, void * pcontrol_arr[],
int * reported_lenp, int verbose)
{
bool resp_mode6;
int k, n, res, offset, calc_len, xfer_len;
int resid = 0;
const int msense10_hlen = MODE10_RESP_HDR_LEN;
uint8_t * buffp;
uint8_t * free_buffp;
char ebuff[EBUFF_SZ];
int first_err = 0;
if (success_mask)
*success_mask = 0;
if (reported_lenp)
*reported_lenp = 0;
if (mx_mpage_len < 4)
return 0;
buffp = sg_memalign(MODE_RESP_ARB_LEN, 0, &free_buffp, false);
if (NULL == buffp)
return sg_convert_errno(ENOMEM);
memset(ebuff, 0, sizeof(ebuff));
/* first try to find length of current page response */
memset(buffp, 0, msense10_hlen);
if (mode6) /* want first 8 bytes just in case */
res = sg_ll_mode_sense6(sg_fd, dbd, 0 /* pc */, pg_code,
sub_pg_code, buffp, msense10_hlen, true,
verbose);
else /* MODE SENSE(10) obviously */
res = sg_ll_mode_sense10_v2(sg_fd, false /* llbaa */, dbd,
0 /* pc */, pg_code, sub_pg_code, buffp,
msense10_hlen, 0, NULL, true, verbose);
if (0 != res) {
first_err = res;
goto fini;
}
n = buffp[0];
if (reported_lenp) {
int bd_len, non_mps;
int m = sg_msense_calc_length(buffp, msense10_hlen, mode6, &bd_len);
non_mps = bd_len + (mode6 ? 4 : 8);
*reported_lenp = (m > non_mps) ? m - non_mps : 0;
}
resp_mode6 = mode6;
if (flexible) {
if (mode6 && (n < 3)) {
resp_mode6 = false;
if (verbose)
pr2ws(">>> msense(6) but resp[0]=%d so try msense(10) "
"response processing\n", n);
}
if ((! mode6) && (n > 5)) {
if ((n > 11) && (0 == (n % 2)) && (0 == buffp[4]) &&
(0 == buffp[5]) && (0 == buffp[6])) {
buffp[1] = n;
buffp[0] = 0;
if (verbose)
pr2ws(">>> msense(10) but resp[0]=%d and not msense(6) "
"response so fix length\n", n);
} else
resp_mode6 = true;
}
}
if (verbose && (resp_mode6 != mode6))
pr2ws(">>> msense(%d) but resp[0]=%d so switch response "
"processing\n", (mode6 ? 6 : 10), buffp[0]);
calc_len = sg_msense_calc_length(buffp, msense10_hlen, resp_mode6, NULL);
if (calc_len > MODE_RESP_ARB_LEN)
calc_len = MODE_RESP_ARB_LEN;
offset = sg_mode_page_offset(buffp, calc_len, resp_mode6, ebuff, EBUFF_SZ);
if (offset < 0) {
if (('\0' != ebuff[0]) && (verbose > 0))
pr2ws("%s: %s\n", __func__, ebuff);
first_err = SG_LIB_CAT_MALFORMED;
goto fini;
}
xfer_len = calc_len - offset;
if (xfer_len > mx_mpage_len)
xfer_len = mx_mpage_len;
for (k = 0; k < 4; ++k) {
if (NULL == pcontrol_arr[k])
continue;
memset(pcontrol_arr[k], 0, mx_mpage_len);
resid = 0;
if (mode6)
res = sg_ll_mode_sense6(sg_fd, dbd, k /* pc */,
pg_code, sub_pg_code, buffp,
calc_len, true, verbose);
else
res = sg_ll_mode_sense10_v2(sg_fd, false /* llbaa */, dbd,
k /* pc */, pg_code, sub_pg_code,
buffp, calc_len, 0, &resid, true,
verbose);
if (res || resid) {
if (0 == first_err) {
if (res)
first_err = res;
else {
first_err = -49; /* unexpected resid != 0 */
if (verbose)
pr2ws("%s: unexpected resid=%d, page=0x%x, "
"pcontrol=%d\n", __func__, resid, pg_code, k);
}
}
if (0 == k)
break; /* if problem on current page, it won't improve */
else
continue;
}
if (xfer_len > 0)
memcpy(pcontrol_arr[k], buffp + offset, xfer_len);
if (success_mask)
*success_mask |= (1 << k);
}
fini:
if (free_buffp)
free(free_buffp);
return first_err;
}
/* Invokes a SCSI LOG SENSE command. Return of 0 -> success,
* various SG_LIB_CAT_* positive values or -1 -> other errors. */
int
sg_ll_log_sense(int sg_fd, bool ppc, bool sp, int pc, int pg_code,
int subpg_code, int paramp, uint8_t * resp,
int mx_resp_len, bool noisy, int verbose)
{
return sg_ll_log_sense_v2(sg_fd, ppc, sp, pc, pg_code, subpg_code,
paramp, resp, mx_resp_len, 0, NULL, noisy,
verbose);
}
/* Invokes a SCSI LOG SENSE command. Return of 0 -> success,
* various SG_LIB_CAT_* positive values or -1 -> other errors.
* Adds the ability to set the command abort timeout
* and the ability to report the residual count. If timeout_secs is zero
* or less the default command abort timeout (60 seconds) is used.
* If residp is non-NULL then the residual value is written where residp
* points. A residual value of 0 implies mx_resp_len bytes have be written
* where resp points. If the residual value equals mx_resp_len then no
* bytes have been written. */
int
sg_ll_log_sense_v2(int sg_fd, bool ppc, bool sp, int pc, int pg_code,
int subpg_code, int paramp, uint8_t * resp,
int mx_resp_len, int timeout_secs, int * residp,
bool noisy, int verbose)
{
static const char * const cdb_s = "log sense";
int res, ret, sense_cat, resid;
uint8_t logs_cdb[LOG_SENSE_CMDLEN] =
{LOG_SENSE_CMD, 0, 0, 0, 0, 0, 0, 0, 0, 0};
uint8_t sense_b[SENSE_BUFF_LEN] SG_C_CPP_ZERO_INIT;
struct sg_pt_base * ptvp;
if (mx_resp_len > 0xffff) {
pr2ws("mx_resp_len too big\n");
goto gen_err;
}
logs_cdb[1] = (uint8_t)((ppc ? 2 : 0) | (sp ? 1 : 0));
logs_cdb[2] = (uint8_t)(((pc << 6) & 0xc0) | (pg_code & 0x3f));
logs_cdb[3] = (uint8_t)(subpg_code & 0xff);
sg_put_unaligned_be16((int16_t)paramp, logs_cdb + 5);
sg_put_unaligned_be16((int16_t)mx_resp_len, logs_cdb + 7);
if (verbose) {
char b[128];
pr2ws(" %s cdb: %s\n", cdb_s,
sg_get_command_str(logs_cdb, LOG_SENSE_CMDLEN, false,
sizeof(b), b));
}
if (timeout_secs <= 0)
timeout_secs = DEF_PT_TIMEOUT;
if (NULL == ((ptvp = create_pt_obj(cdb_s))))
goto gen_err;
set_scsi_pt_cdb(ptvp, logs_cdb, sizeof(logs_cdb));
set_scsi_pt_sense(ptvp, sense_b, sizeof(sense_b));
set_scsi_pt_data_in(ptvp, resp, mx_resp_len);
res = do_scsi_pt(ptvp, sg_fd, timeout_secs, verbose);
ret = sg_cmds_process_resp(ptvp, cdb_s, res, noisy, verbose, &sense_cat);
resid = get_scsi_pt_resid(ptvp);
if (residp)
*residp = resid;
if (-1 == ret) {
if (get_scsi_pt_transport_err(ptvp))
ret = SG_LIB_TRANSPORT_ERROR;
else
ret = sg_convert_errno(get_scsi_pt_os_err(ptvp));
} else if (-2 == ret) {
switch (sense_cat) {
case SG_LIB_CAT_RECOVERED:
case SG_LIB_CAT_NO_SENSE:
ret = 0;
break;
default:
ret = sense_cat;
break;
}
} else {
if ((mx_resp_len > 3) && (ret < 4)) {
/* resid indicates LOG SENSE response length bad, so zero it */
resp[2] = 0;
resp[3] = 0;
}
ret = 0;
}
destruct_scsi_pt_obj(ptvp);
if (resid > 0) {
if (resid > mx_resp_len) {
pr2ws("%s: resid (%d) should never exceed requested len=%d\n",
cdb_s, resid, mx_resp_len);
return ret ? ret : SG_LIB_CAT_MALFORMED;
}
/* zero unfilled section of response buffer */
memset((uint8_t *)resp + (mx_resp_len - resid), 0, resid);
}
return ret;
gen_err:
if (residp)
*residp = 0;
return -1;
}
/* Invokes a SCSI LOG SELECT command. Return of 0 -> success,
* various SG_LIB_CAT_* positive values or -1 -> other errors */
int
sg_ll_log_select(int sg_fd, bool pcr, bool sp, int pc, int pg_code,
int subpg_code, uint8_t * paramp, int param_len,
bool noisy, int verbose)
{
static const char * const cdb_s = "log select";
int res, ret, sense_cat;
uint8_t logs_cdb[LOG_SELECT_CMDLEN] =
{LOG_SELECT_CMD, 0, 0, 0, 0, 0, 0, 0, 0, 0};
uint8_t sense_b[SENSE_BUFF_LEN] SG_C_CPP_ZERO_INIT;
struct sg_pt_base * ptvp;
if (param_len > 0xffff) {
pr2ws("%s: param_len too big\n", cdb_s);
return -1;
}
logs_cdb[1] = (uint8_t)((pcr ? 2 : 0) | (sp ? 1 : 0));
logs_cdb[2] = (uint8_t)(((pc << 6) & 0xc0) | (pg_code & 0x3f));
logs_cdb[3] = (uint8_t)(subpg_code & 0xff);
sg_put_unaligned_be16((int16_t)param_len, logs_cdb + 7);
if (verbose) {
char b[128];
pr2ws(" %s cdb: %s\n", cdb_s,
sg_get_command_str(logs_cdb, LOG_SELECT_CMDLEN, false,
sizeof(b), b));
}
if ((verbose > 1) && (param_len > 0)) {
pr2ws(" %s parameter list\n", cdb_s);
hex2stderr(paramp, param_len, -1);
}
if (NULL == ((ptvp = create_pt_obj(cdb_s))))
return -1;
set_scsi_pt_cdb(ptvp, logs_cdb, sizeof(logs_cdb));
set_scsi_pt_sense(ptvp, sense_b, sizeof(sense_b));
set_scsi_pt_data_out(ptvp, paramp, param_len);
res = do_scsi_pt(ptvp, sg_fd, DEF_PT_TIMEOUT, verbose);
ret = sg_cmds_process_resp(ptvp, cdb_s, res, noisy, verbose, &sense_cat);
if (-1 == ret) {
if (get_scsi_pt_transport_err(ptvp))
ret = SG_LIB_TRANSPORT_ERROR;
else
ret = sg_convert_errno(get_scsi_pt_os_err(ptvp));
} else if (-2 == ret) {
switch (sense_cat) {
case SG_LIB_CAT_RECOVERED:
case SG_LIB_CAT_NO_SENSE:
ret = 0;
break;
default:
ret = sense_cat;
break;
}
} else
ret = 0;
destruct_scsi_pt_obj(ptvp);
return ret;
}
/* Invokes a SCSI START STOP UNIT command (SBC + MMC).
* Return of 0 -> success,
* various SG_LIB_CAT_* positive values or -1 -> other errors.
* SBC-3 and MMC partially overlap on the power_condition_modifier(sbc) and
* format_layer_number(mmc) fields. They also overlap on the noflush(sbc)
* and fl(mmc) one bit field. This is the cause of the awkardly named
* pc_mod__fl_num and noflush__fl arguments to this function.
* */
static int
sg_ll_start_stop_unit_com(struct sg_pt_base * ptvp, int sg_fd, bool immed,
int pc_mod__fl_num, int power_cond, bool noflush__fl,
bool loej, bool start, bool noisy, int verbose)
{
static const char * const cdb_s = "start stop unit";
bool ptvp_given = false;
bool local_sense = true;
bool local_cdb = true;
int res, ret, sense_cat;
uint8_t ssuBlk[START_STOP_CMDLEN] = {START_STOP_CMD, 0, 0, 0, 0, 0};
uint8_t sense_b[SENSE_BUFF_LEN] SG_C_CPP_ZERO_INIT;
if (immed)
ssuBlk[1] = 0x1;
ssuBlk[3] = pc_mod__fl_num & 0xf; /* bits 2 and 3 are reserved in MMC */
ssuBlk[4] = ((power_cond & 0xf) << 4);
if (noflush__fl)
ssuBlk[4] |= 0x4;
if (loej)
ssuBlk[4] |= 0x2;
if (start)
ssuBlk[4] |= 0x1;