summaryrefslogtreecommitdiffstats
path: root/src/udev/scsi_id/scsi_serial.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/udev/scsi_id/scsi_serial.c')
-rw-r--r--src/udev/scsi_id/scsi_serial.c892
1 files changed, 892 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..aed6082
--- /dev/null
+++ b/src/udev/scsi_id/scsi_serial.c
@@ -0,0 +1,892 @@
+/* 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 deny 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 = -EBADF;
+ int cnt;
+ int ind;
+ int retval;
+
+ memzero(dev_scsi->serial, len);
+ for (cnt = 20; cnt > 0; cnt--) {
+ fd = open(devname, O_RDONLY | O_NONBLOCK | O_CLOEXEC | O_NOCTTY);
+ if (fd >= 0 || errno != EBUSY)
+ break;
+
+ usleep_safe(200U*USEC_PER_MSEC + random_u64_range(100U*USEC_PER_MSEC));
+ }
+ 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-20 01:15:16 +0000