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Systemd/src/udev/scsi_id/scsi_serial.c
Lennart Poettering 5d13a15b1d tree-wide: drop spurious newlines (#8764) 
Double newlines (i.e. one empty lines) are great to structure code. But
let's avoid triple newlines (i.e. two empty lines), quadruple newlines,
quintuple newlines, …, that's just spurious whitespace.

It's an easy way to drop 121 lines of code, and keeps the coding style
of our sources a bit tigther.
2018-04-19 12:13:23 +02:00

962 lines
36 KiB
C
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) IBM Corp. 2003
*
* Author: Patrick Mansfield<patmans@us.ibm.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <linux/bsg.h>
#include <linux/types.h>
#include <scsi/scsi.h>
#include <scsi/sg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include "libudev.h"
#include "libudev-private.h"
#include "random-util.h"
#include "scsi.h"
#include "scsi_id.h"
#include "string-util.h"
/*
* A priority based list of id, naa, and binary/ascii for the identifier
* descriptor in VPD page 0x83.
*
* Brute force search for a match starting with the first value in the
* following id_search_list. This is not a performance issue, since there
* is normally one or some small number of descriptors.
*/
static const struct scsi_id_search_values id_search_list[] = {
{ SCSI_ID_TGTGROUP, SCSI_ID_NAA_DONT_CARE, SCSI_ID_BINARY },
{ SCSI_ID_NAA, SCSI_ID_NAA_IEEE_REG_EXTENDED, SCSI_ID_BINARY },
{ SCSI_ID_NAA, SCSI_ID_NAA_IEEE_REG_EXTENDED, SCSI_ID_ASCII },
{ SCSI_ID_NAA, SCSI_ID_NAA_IEEE_REG, SCSI_ID_BINARY },
{ SCSI_ID_NAA, SCSI_ID_NAA_IEEE_REG, SCSI_ID_ASCII },
/*
* Devices already exist using NAA values that are now marked
* reserved. These should not conflict with other values, or it is
* a bug in the device. As long as we find the IEEE extended one
* first, we really don't care what other ones are used. Using
* don't care here means that a device that returns multiple
* non-IEEE descriptors in a random order will get different
* names.
*/
{ SCSI_ID_NAA, SCSI_ID_NAA_DONT_CARE, SCSI_ID_BINARY },
{ SCSI_ID_NAA, SCSI_ID_NAA_DONT_CARE, SCSI_ID_ASCII },
{ SCSI_ID_EUI_64, SCSI_ID_NAA_DONT_CARE, SCSI_ID_BINARY },
{ SCSI_ID_EUI_64, SCSI_ID_NAA_DONT_CARE, SCSI_ID_ASCII },
{ SCSI_ID_T10_VENDOR, SCSI_ID_NAA_DONT_CARE, SCSI_ID_BINARY },
{ SCSI_ID_T10_VENDOR, SCSI_ID_NAA_DONT_CARE, SCSI_ID_ASCII },
{ SCSI_ID_VENDOR_SPECIFIC, SCSI_ID_NAA_DONT_CARE, SCSI_ID_BINARY },
{ SCSI_ID_VENDOR_SPECIFIC, SCSI_ID_NAA_DONT_CARE, SCSI_ID_ASCII },
};
static const char hex_str[]="0123456789abcdef";
/*
* Values returned in the result/status, only the ones used by the code
* are used here.
*/
#define DID_NO_CONNECT 0x01 /* Unable to connect before timeout */
#define DID_BUS_BUSY 0x02 /* Bus remain busy until timeout */
#define DID_TIME_OUT 0x03 /* Timed out for some other reason */
#define DRIVER_TIMEOUT 0x06
#define DRIVER_SENSE 0x08 /* Sense_buffer has been set */
/* The following "category" function returns one of the following */
#define SG_ERR_CAT_CLEAN 0 /* No errors or other information */
#define SG_ERR_CAT_MEDIA_CHANGED 1 /* interpreted from sense buffer */
#define SG_ERR_CAT_RESET 2 /* interpreted from sense buffer */
#define SG_ERR_CAT_TIMEOUT 3
#define SG_ERR_CAT_RECOVERED 4 /* Successful command after recovered err */
#define SG_ERR_CAT_NOTSUPPORTED 5 /* Illegal / unsupported command */
#define SG_ERR_CAT_SENSE 98 /* Something else in the sense buffer */
#define SG_ERR_CAT_OTHER 99 /* Some other error/warning */
static int do_scsi_page80_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, int fd,
char *serial, char *serial_short, int max_len);
static int sg_err_category_new(struct udev *udev,
int scsi_status, int msg_status, int
host_status, int driver_status, const
unsigned char *sense_buffer, int sb_len)
{
scsi_status &= 0x7e;
/*
* XXX change to return only two values - failed or OK.
*/
if (!scsi_status && !host_status && !driver_status)
return SG_ERR_CAT_CLEAN;
if (IN_SET(scsi_status, SCSI_CHECK_CONDITION, SCSI_COMMAND_TERMINATED) ||
(driver_status & 0xf) == DRIVER_SENSE) {
if (sense_buffer && (sb_len > 2)) {
int sense_key;
unsigned char asc;
if (sense_buffer[0] & 0x2) {
sense_key = sense_buffer[1] & 0xf;
asc = sense_buffer[2];
} else {
sense_key = sense_buffer[2] & 0xf;
asc = (sb_len > 12) ? sense_buffer[12] : 0;
}
if (sense_key == RECOVERED_ERROR)
return SG_ERR_CAT_RECOVERED;
else if (sense_key == UNIT_ATTENTION) {
if (0x28 == asc)
return SG_ERR_CAT_MEDIA_CHANGED;
if (0x29 == asc)
return SG_ERR_CAT_RESET;
} else if (sense_key == ILLEGAL_REQUEST)
return SG_ERR_CAT_NOTSUPPORTED;
}
return SG_ERR_CAT_SENSE;
}
if (host_status) {
if (IN_SET(host_status, DID_NO_CONNECT, DID_BUS_BUSY, DID_TIME_OUT))
return SG_ERR_CAT_TIMEOUT;
}
if (driver_status) {
if (driver_status == DRIVER_TIMEOUT)
return SG_ERR_CAT_TIMEOUT;
}
return SG_ERR_CAT_OTHER;
}
static int sg_err_category3(struct udev *udev, struct sg_io_hdr *hp)
{
return sg_err_category_new(udev,
hp->status, hp->msg_status,
hp->host_status, hp->driver_status,
hp->sbp, hp->sb_len_wr);
}
static int sg_err_category4(struct udev *udev, struct sg_io_v4 *hp)
{
return sg_err_category_new(udev, hp->device_status, 0,
hp->transport_status, hp->driver_status,
(unsigned char *)(uintptr_t)hp->response,
hp->response_len);
}
static int scsi_dump_sense(struct udev *udev,
struct scsi_id_device *dev_scsi,
unsigned char *sense_buffer, int sb_len)
{
int s;
int code;
int sense_class;
int sense_key;
int asc, ascq;
#ifdef DUMP_SENSE
char out_buffer[256];
int i, j;
#endif
/*
* Figure out and print the sense key, asc and ascq.
*
* If you want to suppress these for a particular drive model, add
* a black list entry in the scsi_id config file.
*
* XXX We probably need to: lookup the sense/asc/ascq in a retry
* table, and if found return 1 (after dumping the sense, asc, and
* ascq). So, if/when we get something like a power on/reset,
* we'll retry the command.
*/
if (sb_len < 1) {
log_debug("%s: sense buffer empty", dev_scsi->kernel);
return -1;
}
sense_class = (sense_buffer[0] >> 4) & 0x07;
code = sense_buffer[0] & 0xf;
if (sense_class == 7) {
/*
* extended sense data.
*/
s = sense_buffer[7] + 8;
if (sb_len < s) {
log_debug("%s: sense buffer too small %d bytes, %d bytes too short",
dev_scsi->kernel, sb_len, s - sb_len);
return -1;
}
if (IN_SET(code, 0x0, 0x1)) {
sense_key = sense_buffer[2] & 0xf;
if (s < 14) {
/*
* Possible?
*/
log_debug("%s: sense result too" " small %d bytes",
dev_scsi->kernel, s);
return -1;
}
asc = sense_buffer[12];
ascq = sense_buffer[13];
} else if (IN_SET(code, 0x2, 0x3)) {
sense_key = sense_buffer[1] & 0xf;
asc = sense_buffer[2];
ascq = sense_buffer[3];
} else {
log_debug("%s: invalid sense code 0x%x",
dev_scsi->kernel, code);
return -1;
}
log_debug("%s: sense key 0x%x ASC 0x%x ASCQ 0x%x",
dev_scsi->kernel, sense_key, asc, ascq);
} else {
if (sb_len < 4) {
log_debug("%s: sense buffer too small %d bytes, %d bytes too short",
dev_scsi->kernel, sb_len, 4 - sb_len);
return -1;
}
if (sense_buffer[0] < 15)
log_debug("%s: old sense key: 0x%x", dev_scsi->kernel, sense_buffer[0] & 0x0f);
else
log_debug("%s: sense = %2x %2x",
dev_scsi->kernel, sense_buffer[0], sense_buffer[2]);
log_debug("%s: non-extended sense class %d code 0x%0x",
dev_scsi->kernel, sense_class, code);
}
#ifdef DUMP_SENSE
for (i = 0, j = 0; (i < s) && (j < 254); i++) {
out_buffer[j++] = hex_str[(sense_buffer[i] & 0xf0) >> 4];
out_buffer[j++] = hex_str[sense_buffer[i] & 0x0f];
out_buffer[j++] = ' ';
}
out_buffer[j] = '\0';
log_debug("%s: sense dump:", dev_scsi->kernel);
log_debug("%s: %s", dev_scsi->kernel, out_buffer);
#endif
return -1;
}
static int scsi_dump(struct udev *udev,
struct scsi_id_device *dev_scsi, struct sg_io_hdr *io)
{
if (!io->status && !io->host_status && !io->msg_status &&
!io->driver_status) {
/*
* Impossible, should not be called.
*/
log_debug("%s: called with no error", __FUNCTION__);
return -1;
}
log_debug("%s: sg_io failed status 0x%x 0x%x 0x%x 0x%x",
dev_scsi->kernel, io->driver_status, io->host_status, io->msg_status, io->status);
if (io->status == SCSI_CHECK_CONDITION)
return scsi_dump_sense(udev, dev_scsi, io->sbp, io->sb_len_wr);
else
return -1;
}
static int scsi_dump_v4(struct udev *udev,
struct scsi_id_device *dev_scsi, struct sg_io_v4 *io)
{
if (!io->device_status && !io->transport_status &&
!io->driver_status) {
/*
* Impossible, should not be called.
*/
log_debug("%s: called with no error", __FUNCTION__);
return -1;
}
log_debug("%s: sg_io failed status 0x%x 0x%x 0x%x",
dev_scsi->kernel, io->driver_status, io->transport_status, io->device_status);
if (io->device_status == SCSI_CHECK_CONDITION)
return scsi_dump_sense(udev, dev_scsi, (unsigned char *)(uintptr_t)io->response,
io->response_len);
else
return -1;
}
static int scsi_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, int fd,
unsigned char evpd, unsigned char page,
unsigned char *buf, unsigned int buflen)
{
unsigned char inq_cmd[INQUIRY_CMDLEN] =
{ INQUIRY_CMD, evpd, page, 0, buflen, 0 };
unsigned char sense[SENSE_BUFF_LEN];
void *io_buf;
struct sg_io_v4 io_v4;
struct sg_io_hdr io_hdr;
int retry = 3; /* rather random */
int retval;
if (buflen > SCSI_INQ_BUFF_LEN) {
log_debug("buflen %d too long", buflen);
return -1;
}
resend:
if (dev_scsi->use_sg == 4) {
memzero(&io_v4, sizeof(struct sg_io_v4));
io_v4.guard = 'Q';
io_v4.protocol = BSG_PROTOCOL_SCSI;
io_v4.subprotocol = BSG_SUB_PROTOCOL_SCSI_CMD;
io_v4.request_len = sizeof(inq_cmd);
io_v4.request = (uintptr_t)inq_cmd;
io_v4.max_response_len = sizeof(sense);
io_v4.response = (uintptr_t)sense;
io_v4.din_xfer_len = buflen;
io_v4.din_xferp = (uintptr_t)buf;
io_buf = (void *)&io_v4;
} else {
memzero(&io_hdr, sizeof(struct sg_io_hdr));
io_hdr.interface_id = 'S';
io_hdr.cmd_len = sizeof(inq_cmd);
io_hdr.mx_sb_len = sizeof(sense);
io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
io_hdr.dxfer_len = buflen;
io_hdr.dxferp = buf;
io_hdr.cmdp = inq_cmd;
io_hdr.sbp = sense;
io_hdr.timeout = DEF_TIMEOUT;
io_buf = (void *)&io_hdr;
}
retval = ioctl(fd, SG_IO, io_buf);
if (retval < 0) {
if (IN_SET(errno, EINVAL, ENOSYS) && dev_scsi->use_sg == 4) {
dev_scsi->use_sg = 3;
goto resend;
}
log_debug_errno(errno, "%s: ioctl failed: %m", dev_scsi->kernel);
goto error;
}
if (dev_scsi->use_sg == 4)
retval = sg_err_category4(udev, io_buf);
else
retval = sg_err_category3(udev, io_buf);
switch (retval) {
case SG_ERR_CAT_NOTSUPPORTED:
buf[1] = 0;
_fallthrough_;
case SG_ERR_CAT_CLEAN:
case SG_ERR_CAT_RECOVERED:
retval = 0;
break;
default:
if (dev_scsi->use_sg == 4)
retval = scsi_dump_v4(udev, dev_scsi, io_buf);
else
retval = scsi_dump(udev, dev_scsi, io_buf);
}
if (!retval) {
retval = buflen;
} else if (retval > 0) {
if (--retry > 0)
goto resend;
retval = -1;
}
error:
if (retval < 0)
log_debug("%s: Unable to get INQUIRY vpd %d page 0x%x.",
dev_scsi->kernel, evpd, page);
return retval;
}
/* Get list of supported EVPD pages */
static int do_scsi_page0_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, int fd,
unsigned char *buffer, unsigned int len)
{
int retval;
memzero(buffer, len);
retval = scsi_inquiry(udev, dev_scsi, fd, 1, 0x0, buffer, len);
if (retval < 0)
return 1;
if (buffer[1] != 0) {
log_debug("%s: page 0 not available.", dev_scsi->kernel);
return 1;
}
if (buffer[3] > len) {
log_debug("%s: page 0 buffer too long %d", dev_scsi->kernel, buffer[3]);
return 1;
}
/*
* Following check is based on code once included in the 2.5.x
* kernel.
*
* Some ill behaved devices return the standard inquiry here
* rather than the evpd data, snoop the data to verify.
*/
if (buffer[3] > MODEL_LENGTH) {
/*
* If the vendor id appears in the page assume the page is
* invalid.
*/
if (strneq((char *)&buffer[VENDOR_LENGTH], dev_scsi->vendor, VENDOR_LENGTH)) {
log_debug("%s: invalid page0 data", dev_scsi->kernel);
return 1;
}
}
return 0;
}
/*
* The caller checks that serial is long enough to include the vendor +
* model.
*/
static int prepend_vendor_model(struct udev *udev,
struct scsi_id_device *dev_scsi, char *serial)
{
int ind;
strncpy(serial, dev_scsi->vendor, VENDOR_LENGTH);
strncat(serial, dev_scsi->model, MODEL_LENGTH);
ind = strlen(serial);
/*
* This is not a complete check, since we are using strncat/cpy
* above, ind will never be too large.
*/
if (ind != (VENDOR_LENGTH + MODEL_LENGTH)) {
log_debug("%s: expected length %d, got length %d",
dev_scsi->kernel, (VENDOR_LENGTH + MODEL_LENGTH), ind);
return -1;
}
return ind;
}
/*
* check_fill_0x83_id - check the page 0x83 id, if OK allocate and fill
* serial number.
*/
static int check_fill_0x83_id(struct udev *udev,
struct scsi_id_device *dev_scsi,
unsigned char *page_83,
const struct scsi_id_search_values
*id_search, char *serial, char *serial_short,
int max_len, char *wwn,
char *wwn_vendor_extension, char *tgpt_group)
{
int i, j, s, len;
/*
* ASSOCIATION must be with the device (value 0)
* or with the target port for SCSI_ID_TGTPORT
*/
if ((page_83[1] & 0x30) == 0x10) {
if (id_search->id_type != SCSI_ID_TGTGROUP)
return 1;
} else if ((page_83[1] & 0x30) != 0)
return 1;
if ((page_83[1] & 0x0f) != id_search->id_type)
return 1;
/*
* Possibly check NAA sub-type.
*/
if ((id_search->naa_type != SCSI_ID_NAA_DONT_CARE) &&
(id_search->naa_type != (page_83[4] & 0xf0) >> 4))
return 1;
/*
* Check for matching code set - ASCII or BINARY.
*/
if ((page_83[0] & 0x0f) != id_search->code_set)
return 1;
/*
* page_83[3]: identifier length
*/
len = page_83[3];
if ((page_83[0] & 0x0f) != SCSI_ID_ASCII)
/*
* If not ASCII, use two bytes for each binary value.
*/
len *= 2;
/*
* Add one byte for the NUL termination, and one for the id_type.
*/
len += 2;
if (id_search->id_type == SCSI_ID_VENDOR_SPECIFIC)
len += VENDOR_LENGTH + MODEL_LENGTH;
if (max_len < len) {
log_debug("%s: length %d too short - need %d",
dev_scsi->kernel, max_len, len);
return 1;
}
if (id_search->id_type == SCSI_ID_TGTGROUP && tgpt_group != NULL) {
unsigned int group;
group = ((unsigned int)page_83[6] << 8) | page_83[7];
sprintf(tgpt_group,"%x", group);
return 1;
}
serial[0] = hex_str[id_search->id_type];
/*
* For SCSI_ID_VENDOR_SPECIFIC prepend the vendor and model before
* the id since it is not unique across all vendors and models,
* this differs from SCSI_ID_T10_VENDOR, where the vendor is
* included in the identifier.
*/
if (id_search->id_type == SCSI_ID_VENDOR_SPECIFIC)
if (prepend_vendor_model(udev, dev_scsi, &serial[1]) < 0)
return 1;
i = 4; /* offset to the start of the identifier */
s = j = strlen(serial);
if ((page_83[0] & 0x0f) == SCSI_ID_ASCII) {
/*
* ASCII descriptor.
*/
while (i < (4 + page_83[3]))
serial[j++] = page_83[i++];
} else {
/*
* Binary descriptor, convert to ASCII, using two bytes of
* ASCII for each byte in the page_83.
*/
while (i < (4 + page_83[3])) {
serial[j++] = hex_str[(page_83[i] & 0xf0) >> 4];
serial[j++] = hex_str[page_83[i] & 0x0f];
i++;
}
}
strcpy(serial_short, &serial[s]);
if (id_search->id_type == SCSI_ID_NAA && wwn != NULL) {
strncpy(wwn, &serial[s], 16);
if (wwn_vendor_extension != NULL)
strncpy(wwn_vendor_extension, &serial[s + 16], 16);
}
return 0;
}
/* Extract the raw binary from VPD 0x83 pre-SPC devices */
static int check_fill_0x83_prespc3(struct udev *udev,
struct scsi_id_device *dev_scsi,
unsigned char *page_83,
const struct scsi_id_search_values
*id_search, char *serial, char *serial_short, int max_len)
{
int i, j;
serial[0] = hex_str[id_search->id_type];
/* serial has been memset to zero before */
j = strlen(serial); /* j = 1; */
for (i = 0; (i < page_83[3]) && (j < max_len-3); ++i) {
serial[j++] = hex_str[(page_83[4+i] & 0xf0) >> 4];
serial[j++] = hex_str[ page_83[4+i] & 0x0f];
}
serial[max_len-1] = 0;
strncpy(serial_short, serial, max_len-1);
return 0;
}
/* Get device identification VPD page */
static int do_scsi_page83_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, int fd,
char *serial, char *serial_short, int len,
char *unit_serial_number, char *wwn,
char *wwn_vendor_extension, char *tgpt_group)
{
int retval;
unsigned int id_ind, j;
unsigned char page_83[SCSI_INQ_BUFF_LEN];
/* also pick up the page 80 serial number */
do_scsi_page80_inquiry(udev, dev_scsi, fd, NULL, unit_serial_number, MAX_SERIAL_LEN);
memzero(page_83, SCSI_INQ_BUFF_LEN);
retval = scsi_inquiry(udev, dev_scsi, fd, 1, PAGE_83, page_83,
SCSI_INQ_BUFF_LEN);
if (retval < 0)
return 1;
if (page_83[1] != PAGE_83) {
log_debug("%s: Invalid page 0x83", dev_scsi->kernel);
return 1;
}
/*
* XXX Some devices (IBM 3542) return all spaces for an identifier if
* the LUN is not actually configured. This leads to identifiers of
* the form: "1 ".
*/
/*
* Model 4, 5, and (some) model 6 EMC Symmetrix devices return
* a page 83 reply according to SCSI-2 format instead of SPC-2/3.
*
* The SCSI-2 page 83 format returns an IEEE WWN in binary
* encoded hexi-decimal in the 16 bytes following the initial
* 4-byte page 83 reply header.
*
* Both the SPC-2 and SPC-3 formats return an IEEE WWN as part
* of an Identification descriptor. The 3rd byte of the first
* Identification descriptor is a reserved (BSZ) byte field.
*
* Reference the 7th byte of the page 83 reply to determine
* whether the reply is compliant with SCSI-2 or SPC-2/3
* specifications. A zero value in the 7th byte indicates
* an SPC-2/3 conformant reply, (i.e., the reserved field of the
* first Identification descriptor). This byte will be non-zero
* for a SCSI-2 conformant page 83 reply from these EMC
* Symmetrix models since the 7th byte of the reply corresponds
* to the 4th and 5th nibbles of the 6-byte OUI for EMC, that is,
* 0x006048.
*/
if (page_83[6] != 0)
return check_fill_0x83_prespc3(udev,
dev_scsi, page_83, id_search_list,
serial, serial_short, len);
/*
* Search for a match in the prioritized id_search_list - since WWN ids
* come first we can pick up the WWN in check_fill_0x83_id().
*/
for (id_ind = 0;
id_ind < sizeof(id_search_list)/sizeof(id_search_list[0]);
id_ind++) {
/*
* Examine each descriptor returned. There is normally only
* one or a small number of descriptors.
*/
for (j = 4; j <= (unsigned int)page_83[3] + 3; j += page_83[j + 3] + 4) {
retval = check_fill_0x83_id(udev,
dev_scsi, &page_83[j],
&id_search_list[id_ind],
serial, serial_short, len,
wwn, wwn_vendor_extension,
tgpt_group);
if (!retval)
return retval;
else if (retval < 0)
return retval;
}
}
return 1;
}
/*
* Get device identification VPD page for older SCSI-2 device which is not
* compliant with either SPC-2 or SPC-3 format.
*
* Return the hard coded error code value 2 if the page 83 reply is not
* conformant to the SCSI-2 format.
*/
static int do_scsi_page83_prespc3_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, int fd,
char *serial, char *serial_short, int len)
{
int retval;
int i, j;
unsigned char page_83[SCSI_INQ_BUFF_LEN];
memzero(page_83, SCSI_INQ_BUFF_LEN);
retval = scsi_inquiry(udev, dev_scsi, fd, 1, PAGE_83, page_83, SCSI_INQ_BUFF_LEN);
if (retval < 0)
return 1;
if (page_83[1] != PAGE_83) {
log_debug("%s: Invalid page 0x83", dev_scsi->kernel);
return 1;
}
/*
* Model 4, 5, and (some) model 6 EMC Symmetrix devices return
* a page 83 reply according to SCSI-2 format instead of SPC-2/3.
*
* The SCSI-2 page 83 format returns an IEEE WWN in binary
* encoded hexi-decimal in the 16 bytes following the initial
* 4-byte page 83 reply header.
*
* Both the SPC-2 and SPC-3 formats return an IEEE WWN as part
* of an Identification descriptor. The 3rd byte of the first
* Identification descriptor is a reserved (BSZ) byte field.
*
* Reference the 7th byte of the page 83 reply to determine
* whether the reply is compliant with SCSI-2 or SPC-2/3
* specifications. A zero value in the 7th byte indicates
* an SPC-2/3 conformant reply, (i.e., the reserved field of the
* first Identification descriptor). This byte will be non-zero
* for a SCSI-2 conformant page 83 reply from these EMC
* Symmetrix models since the 7th byte of the reply corresponds
* to the 4th and 5th nibbles of the 6-byte OUI for EMC, that is,
* 0x006048.
*/
if (page_83[6] == 0)
return 2;
serial[0] = hex_str[id_search_list[0].id_type];
/*
* The first four bytes contain data, not a descriptor.
*/
i = 4;
j = strlen(serial);
/*
* Binary descriptor, convert to ASCII,
* using two bytes of ASCII for each byte
* in the page_83.
*/
while (i < (page_83[3]+4)) {
serial[j++] = hex_str[(page_83[i] & 0xf0) >> 4];
serial[j++] = hex_str[page_83[i] & 0x0f];
i++;
}
return 0;
}
/* Get unit serial number VPD page */
static int do_scsi_page80_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, int fd,
char *serial, char *serial_short, int max_len)
{
int retval;
int ser_ind;
int i;
int len;
unsigned char buf[SCSI_INQ_BUFF_LEN];
memzero(buf, SCSI_INQ_BUFF_LEN);
retval = scsi_inquiry(udev, dev_scsi, fd, 1, PAGE_80, buf, SCSI_INQ_BUFF_LEN);
if (retval < 0)
return retval;
if (buf[1] != PAGE_80) {
log_debug("%s: Invalid page 0x80", dev_scsi->kernel);
return 1;
}
len = 1 + VENDOR_LENGTH + MODEL_LENGTH + buf[3];
if (max_len < len) {
log_debug("%s: length %d too short - need %d",
dev_scsi->kernel, max_len, len);
return 1;
}
/*
* Prepend 'S' to avoid unlikely collision with page 0x83 vendor
* specific type where we prepend '0' + vendor + model.
*/
len = buf[3];
if (serial != NULL) {
serial[0] = 'S';
ser_ind = prepend_vendor_model(udev, dev_scsi, &serial[1]);
if (ser_ind < 0)
return 1;
ser_ind++; /* for the leading 'S' */
for (i = 4; i < len + 4; i++, ser_ind++)
serial[ser_ind] = buf[i];
}
if (serial_short != NULL) {
memcpy(serial_short, &buf[4], len);
serial_short[len] = '\0';
}
return 0;
}
int scsi_std_inquiry(struct udev *udev,
struct scsi_id_device *dev_scsi, const char *devname)
{
int fd;
unsigned char buf[SCSI_INQ_BUFF_LEN];
struct stat statbuf;
int err = 0;
fd = open(devname, O_RDONLY | O_NONBLOCK | O_CLOEXEC);
if (fd < 0) {
log_debug_errno(errno, "scsi_id: cannot open %s: %m", devname);
return 1;
}
if (fstat(fd, &statbuf) < 0) {
log_debug_errno(errno, "scsi_id: cannot stat %s: %m", devname);
err = 2;
goto out;
}
sprintf(dev_scsi->kernel,"%d:%d", major(statbuf.st_rdev),
minor(statbuf.st_rdev));
memzero(buf, SCSI_INQ_BUFF_LEN);
err = scsi_inquiry(udev, dev_scsi, fd, 0, 0, buf, SCSI_INQ_BUFF_LEN);
if (err < 0)
goto out;
err = 0;
memcpy(dev_scsi->vendor, buf + 8, 8);
dev_scsi->vendor[8] = '\0';
memcpy(dev_scsi->model, buf + 16, 16);
dev_scsi->model[16] = '\0';
memcpy(dev_scsi->revision, buf + 32, 4);
dev_scsi->revision[4] = '\0';
sprintf(dev_scsi->type,"%x", buf[0] & 0x1f);
out:
close(fd);
return err;
}
int scsi_get_serial(struct udev *udev,
struct scsi_id_device *dev_scsi, const char *devname,
int page_code, int len)
{
unsigned char page0[SCSI_INQ_BUFF_LEN];
int fd = -1;
int cnt;
int ind;
int retval;
memzero(dev_scsi->serial, len);
initialize_srand();
for (cnt = 20; cnt > 0; cnt--) {
struct timespec duration;
fd = open(devname, O_RDONLY | O_NONBLOCK | O_CLOEXEC);
if (fd >= 0 || errno != EBUSY)
break;
duration.tv_sec = 0;
duration.tv_nsec = (200 * 1000 * 1000) + (rand() % 100 * 1000 * 1000);
nanosleep(&duration, NULL);
}
if (fd < 0)
return 1;
if (page_code == PAGE_80) {
if (do_scsi_page80_inquiry(udev, dev_scsi, fd, dev_scsi->serial, dev_scsi->serial_short, len)) {
retval = 1;
goto completed;
} else {
retval = 0;
goto completed;
}
} else if (page_code == PAGE_83) {
if (do_scsi_page83_inquiry(udev, dev_scsi, fd, dev_scsi->serial, dev_scsi->serial_short, len, dev_scsi->unit_serial_number, dev_scsi->wwn, dev_scsi->wwn_vendor_extension, dev_scsi->tgpt_group)) {
retval = 1;
goto completed;
} else {
retval = 0;
goto completed;
}
} else if (page_code == PAGE_83_PRE_SPC3) {
retval = do_scsi_page83_prespc3_inquiry(udev, dev_scsi, fd, dev_scsi->serial, dev_scsi->serial_short, len);
if (retval) {
/*
* Fallback to servicing a SPC-2/3 compliant page 83
* inquiry if the page 83 reply format does not
* conform to pre-SPC3 expectations.
*/
if (retval == 2) {
if (do_scsi_page83_inquiry(udev, dev_scsi, fd, dev_scsi->serial, dev_scsi->serial_short, len, dev_scsi->unit_serial_number, dev_scsi->wwn, dev_scsi->wwn_vendor_extension, dev_scsi->tgpt_group)) {
retval = 1;
goto completed;
} else {
retval = 0;
goto completed;
}
}
else {
retval = 1;
goto completed;
}
} else {
retval = 0;
goto completed;
}
} else if (page_code != 0x00) {
log_debug("%s: unsupported page code 0x%d", dev_scsi->kernel, page_code);
retval = 1;
goto completed;
}
/*
* Get page 0, the page of the pages. By default, try from best to
* worst of supported pages: 0x83 then 0x80.
*/
if (do_scsi_page0_inquiry(udev, dev_scsi, fd, page0, SCSI_INQ_BUFF_LEN)) {
/*
* Don't try anything else. Black list if a specific page
* should be used for this vendor+model, or maybe have an
* optional fall-back to page 0x80 or page 0x83.
*/
retval = 1;
goto completed;
}
for (ind = 4; ind <= page0[3] + 3; ind++)
if (page0[ind] == PAGE_83)
if (!do_scsi_page83_inquiry(udev, dev_scsi, fd,
dev_scsi->serial, dev_scsi->serial_short, len, dev_scsi->unit_serial_number, dev_scsi->wwn, dev_scsi->wwn_vendor_extension, dev_scsi->tgpt_group)) {
/*
* Success
*/
retval = 0;
goto completed;
}
for (ind = 4; ind <= page0[3] + 3; ind++)
if (page0[ind] == PAGE_80)
if (!do_scsi_page80_inquiry(udev, dev_scsi, fd,
dev_scsi->serial, dev_scsi->serial_short, len)) {
/*
* Success
*/
retval = 0;
goto completed;
}
retval = 1;
completed:
close(fd);
return retval;
}
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