Adding upstream version 252.22.upstream/252.22

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 895 insertions, 0 deletions

diff --git a/src/udev/scsi_id/scsi_serial.c b/src/udev/scsi_id/scsi_serial.c
new file mode 100644
index 0000000..f1ce860
--- /dev/null
+++ b/src/udev/scsi_id/scsi_serial.c
@@ -0,0 +1,895 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright © IBM Corp. 2003
+ *
+ * Author: Patrick Mansfield<patmans@us.ibm.com>
+ */
+
+#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 <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "devnum-util.h"
+#include "memory-util.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 DID_TRANSPORT_DISRUPTED      0x0e        /* Transport disrupted and should retry */
+#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_RETRY                6        /* Command should be retried */
+#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 scsi_id_device *dev_scsi, int fd,
+                                  char *serial, char *serial_short, int max_len);
+
+static int sg_err_category_new(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 (host_status == DID_TRANSPORT_DISRUPTED)
+                        return SG_ERR_CAT_RETRY;
+        }
+        if (driver_status) {
+                if (driver_status == DRIVER_TIMEOUT)
+                        return SG_ERR_CAT_TIMEOUT;
+        }
+        return SG_ERR_CAT_OTHER;
+}
+
+static int sg_err_category3(struct sg_io_hdr *hp) {
+        return sg_err_category_new(hp->status, hp->msg_status,
+                                   hp->host_status, hp->driver_status,
+                                   hp->sbp, hp->sb_len_wr);
+}
+
+static int sg_err_category4(struct sg_io_v4 *hp) {
+        return sg_err_category_new(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 scsi_id_device *dev_scsi,
+                           unsigned char *sense_buffer, int sb_len) {
+        int s;
+        unsigned code, sense_class, sense_key, asc, ascq;
+
+        /*
+         * 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)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "%s: sense buffer empty",
+                                       dev_scsi->kernel);
+
+        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)
+                        return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                               "%s: sense buffer too small %d bytes, %d bytes too short",
+                                               dev_scsi->kernel, sb_len,
+                                               s - sb_len);
+
+                if (IN_SET(code, 0x0, 0x1)) {
+                        sense_key = sense_buffer[2] & 0xf;
+                        if (s < 14)
+                                /*
+                                 * Possible?
+                                 */
+                                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "%s: sense result too small %d bytes",
+                                                       dev_scsi->kernel, s);
+
+                        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
+                        return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                               "%s: invalid sense code 0x%x",
+                                               dev_scsi->kernel, code);
+
+                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)
+                        return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                               "%s: sense buffer too small %d bytes, %d bytes too short",
+                                               dev_scsi->kernel, sb_len,
+                                               4 - sb_len);
+
+                if (sense_buffer[0] < 15)
+                        log_debug("%s: old sense key: 0x%x", dev_scsi->kernel, sense_buffer[0] & 0x0fu);
+                else
+                        log_debug("%s: sense = %2x %2x",
+                                  dev_scsi->kernel, sense_buffer[0], sense_buffer[2]);
+                log_debug("%s: non-extended sense class %u code 0x%0x",
+                          dev_scsi->kernel, sense_class, code);
+
+        }
+
+        return -1;
+}
+
+static int scsi_dump(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.
+                 */
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "%s: called with no error",
+                                       __func__);
+
+        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(dev_scsi, io->sbp, io->sb_len_wr);
+        else
+                return -1;
+}
+
+static int scsi_dump_v4(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.
+                 */
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "%s: called with no error",
+                                       __func__);
+
+        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(dev_scsi, (unsigned char *)(uintptr_t)io->response,
+                                       io->response_len);
+        else
+                return -1;
+}
+
+static int scsi_inquiry(struct scsi_id_device *dev_scsi, int fd,
+                        unsigned char evpd, unsigned char page,
+                        unsigned char *buf, unsigned 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)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "buflen %u too long", buflen);
+
+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(io_buf);
+        else
+                retval = sg_err_category3(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;
+                case SG_ERR_CAT_RETRY:
+                        break;
+
+                default:
+                        if (dev_scsi->use_sg == 4)
+                                retval = scsi_dump_v4(dev_scsi, io_buf);
+                        else
+                                retval = scsi_dump(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 scsi_id_device *dev_scsi, int fd,
+                                 unsigned char *buffer, unsigned len) {
+        int retval;
+
+        memzero(buffer, len);
+        retval = scsi_inquiry(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;
+}
+
+static int append_vendor_model(
+                const struct scsi_id_device *dev_scsi,
+                char buf[static VENDOR_LENGTH + MODEL_LENGTH]) {
+
+        assert(dev_scsi);
+        assert(buf);
+
+        if (strnlen(dev_scsi->vendor, VENDOR_LENGTH) != VENDOR_LENGTH)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "%s: bad vendor string \"%s\"",
+                                       dev_scsi->kernel, dev_scsi->vendor);
+        if (strnlen(dev_scsi->model, MODEL_LENGTH) != MODEL_LENGTH)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "%s: bad model string \"%s\"",
+                                       dev_scsi->kernel, dev_scsi->model);
+        memcpy(buf, dev_scsi->vendor, VENDOR_LENGTH);
+        memcpy(buf + VENDOR_LENGTH, dev_scsi->model, MODEL_LENGTH);
+        return VENDOR_LENGTH + MODEL_LENGTH;
+}
+
+/*
+ * check_fill_0x83_id - check the page 0x83 id, if OK allocate and fill
+ * serial number.
+ */
+static int check_fill_0x83_id(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 group;
+
+                group = ((unsigned)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 (append_vendor_model(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)
+                        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 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[SCSI_ID_NAA];
+        /* 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 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 id_ind, j;
+        unsigned char page_83[SCSI_INQ_BUFF_LEN];
+
+        /* also pick up the page 80 serial number */
+        do_scsi_page80_inquiry(dev_scsi, fd, NULL, unit_serial_number, MAX_SERIAL_LEN);
+
+        memzero(page_83, SCSI_INQ_BUFF_LEN);
+        retval = scsi_inquiry(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(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)page_83[2] << 8) + (unsigned)page_83[3] + 3; j += page_83[j + 3] + 4) {
+                        retval = check_fill_0x83_id(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 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(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[SCSI_ID_NAA];
+        /*
+         * 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 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(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) {
+                serial[0] = 'S';
+                ser_ind = append_vendor_model(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) {
+                memcpy(serial_short, buf + 4, len);
+                serial_short[len] = '\0';
+        }
+        return 0;
+}
+
+int scsi_std_inquiry(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 | O_NOCTTY);
+        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;
+        }
+        format_devnum(statbuf.st_rdev, dev_scsi->kernel);
+
+        memzero(buf, SCSI_INQ_BUFF_LEN);
+        err = scsi_inquiry(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';
+        dev_scsi->type = buf[0] & 0x1f;
+
+out:
+        close(fd);
+        return err;
+}
+
+int scsi_get_serial(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);
+        for (cnt = 20; cnt > 0; cnt--) {
+                struct timespec duration;
+
+                fd = open(devname, O_RDONLY | O_NONBLOCK | O_CLOEXEC | O_NOCTTY);
+                if (fd >= 0 || errno != EBUSY)
+                        break;
+                duration.tv_sec = 0;
+                duration.tv_nsec = (200 * 1000 * 1000) + (random_u32() % 100 * 1000 * 1000);
+                nanosleep(&duration, NULL);
+        }
+        if (fd < 0)
+                return 1;
+
+        if (page_code == PAGE_80) {
+                if (do_scsi_page80_inquiry(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(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(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(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(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(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(dev_scsi, fd,
+                                                    dev_scsi->serial, dev_scsi->serial_short, len)) {
+                                /*
+                                 * Success
+                                 */
+                                retval = 0;
+                                goto completed;
+                        }
+        retval = 1;
+
+completed:
+        close(fd);
+        return retval;
+}