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freebsd-dev/lib/libcam/camlib.c
Kenneth D. Merry b735c71405 Use snprintf to make sure we don't overflow a buffer.
1998-11-15 23:17:39 +00:00

782 lines
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/*
* Copyright (c) 1997, 1998 Kenneth D. Merry.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: camlib.c,v 1.3 1998/11/15 23:12:42 ken Exp $
*/
#include <sys/types.h>
#include <sys/param.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <cam/cam.h>
#include <cam/scsi/scsi_all.h>
#include <cam/cam_ccb.h>
#include <cam/scsi/scsi_pass.h>
#include "camlib.h"
struct cam_devequiv {
char *given_dev;
char *real_dev;
};
struct cam_devequiv devmatchtable[] = {
{"sd", "da"},
{"st", "sa"}
};
char cam_errbuf[CAM_ERRBUF_SIZE];
static struct cam_device *cam_real_open_device(const char *path, int flags,
struct cam_device *device,
const char *given_path,
const char *given_dev_name,
int given_unit_number);
static struct cam_device *cam_lookup_pass(const char *dev_name, int unit,
int flags, const char *given_path,
struct cam_device *device);
/*
* Send a ccb to a passthrough device.
*/
int
cam_send_ccb(struct cam_device *device, union ccb *ccb)
{
return(ioctl(device->fd, CAMIOCOMMAND, ccb));
}
/*
* Malloc a CCB, zero out the header and set its path, target and lun ids.
*/
union ccb *
cam_getccb(struct cam_device *dev)
{
union ccb *ccb;
ccb = (union ccb *)malloc(sizeof(union ccb));
if (ccb != NULL) {
bzero(&ccb->ccb_h, sizeof(struct ccb_hdr));
ccb->ccb_h.path_id = dev->path_id;
ccb->ccb_h.target_id = dev->target_id;
ccb->ccb_h.target_lun = dev->target_lun;
}
return(ccb);
}
/*
* Free a CCB.
*/
void
cam_freeccb(union ccb *ccb)
{
if (ccb != NULL)
free(ccb);
}
/*
* Take a device name or path passed in by the user, and attempt to figure
* out the device name and unit number. Some possible device name formats are:
* /dev/foo0a
* /dev/rfoo0a
* /dev/rfoos2c
* foo0
* foo0a
* rfoo0
* rfoo0a
* nrfoo0
*
* If the caller passes in an old style device name like 'sd' or 'st',
* it will be converted to the new style device name based upon devmatchtable
* above.
*
* Input parameters: device name/path, length of devname string
* Output: device name, unit number
* Return values: returns 0 for success, -1 for failure
*/
int
cam_get_device(const char *path, char *dev_name, int devnamelen, int *unit)
{
char *func_name = "cam_get_device";
char *tmpstr, *tmpstr2;
char *newpath;
int unit_offset;
int i, found = 0;
if (path == NULL) {
sprintf(cam_errbuf, "%s: device pathname was NULL", func_name);
return(0);
}
/*
* We can be rather destructive to the path string. Make a copy of
* it so we don't hose the user's string.
*/
newpath = (char *)strdup(path);
tmpstr = newpath;
/* Get rid of any leading white space */
while (isspace(*tmpstr) && (*tmpstr != '\0'))
tmpstr++;
/*
* Check to see whether we have an absolute pathname.
*/
if (*tmpstr == '/') {
tmpstr2 = tmpstr;
tmpstr = (char *)rindex(tmpstr2, '/');
if ((tmpstr != NULL) && (*tmpstr != '\0'))
tmpstr++;
}
if (*tmpstr == '\0') {
sprintf(cam_errbuf, "%s: no text after slash", func_name);
free(newpath);
return(0);
}
/*
* Check to see whether the user has given us a nonrewound tape
* device.
*/
if (*tmpstr == 'n')
tmpstr++;
if (*tmpstr == '\0') {
sprintf(cam_errbuf, "%s: no text after leading 'n'", func_name);
free(newpath);
return(0);
}
/*
* See if the user has given us a character device.
*/
if (*tmpstr == 'r')
tmpstr++;
if (*tmpstr == '\0') {
sprintf(cam_errbuf, "%s: no text after leading 'r'", func_name);
free(newpath);
return(0);
}
/*
* Try to get rid of any trailing white space or partition letters.
*/
tmpstr2 = &tmpstr[strlen(tmpstr) - 1];
while ((*tmpstr2 != '\0') && (tmpstr2 > tmpstr) &&(!isdigit(*tmpstr2))){
*tmpstr2 = '\0';
tmpstr2--;
}
/*
* Check to see whether we have been given a partition with a slice
* name. If so, get rid of the slice name/number.
*/
if (strlen(tmpstr) > 3) {
/*
* Basically, we're looking for a string that ends in the
* following general manner: 1s1 -- a number, the letter
* s, and then another number. This indicates that the
* user has given us a slice. We substitute nulls for the
* s and the slice number.
*/
if ((isdigit(tmpstr[strlen(tmpstr) - 1]))
&& (tmpstr[strlen(tmpstr) - 2] == 's')
&& (isdigit(tmpstr[strlen(tmpstr) - 3]))) {
tmpstr[strlen(tmpstr) - 1] = '\0';
tmpstr[strlen(tmpstr) - 1] = '\0';
}
}
/*
* After we nuke off the slice, we should have just a device name
* and unit number. That means there must be at least 2
* characters. If we only have 1, we don't have a valid device name.
*/
if (strlen(tmpstr) < 2) {
sprintf(cam_errbuf,
"%s: must have both device name and unit number",
func_name);
free(newpath);
return(0);
}
/*
* If the first character of the string is a digit, then the user
* has probably given us all numbers. Point out the error.
*/
if (isdigit(*tmpstr)) {
sprintf(cam_errbuf,
"%s: device name cannot begin with a number",
func_name);
free(newpath);
return(0);
}
/*
* At this point, if the last character of the string isn't a
* number, we know the user either didn't give us a device number,
* or he gave us a device name/number format we don't recognize.
*/
if (!isdigit(tmpstr[strlen(tmpstr) - 1])) {
sprintf(cam_errbuf, "%s: unable to find device unit number",
func_name);
free(newpath);
return(0);
}
/*
* Attempt to figure out where the device name ends and the unit
* number begins. As long as unit_offset is at least 1 less than
* the length of the string, we can still potentially have a device
* name at the front of the string. When we get to something that
* isn't a digit, we've hit the device name. Because of the check
* above, we know that this cannot happen when unit_offset == 1.
* Therefore it is okay to decrement unit_offset -- it won't cause
* us to go past the end of the character array.
*/
for (unit_offset = 1;
(unit_offset < (strlen(tmpstr)))
&& (isdigit(tmpstr[strlen(tmpstr) - unit_offset])); unit_offset++);
unit_offset--;
/*
* Grab the unit number.
*/
*unit = atoi(&tmpstr[strlen(tmpstr) - unit_offset]);
/*
* Put a null in place of the first number of the unit number so
* that all we have left is the device name.
*/
tmpstr[strlen(tmpstr) - unit_offset] = '\0';
/*
* Look through our equivalency table and see if the device name
* the user gave us is an old style device name. If so, translate
* it to the new style device name.
*/
for (i = 0;i < (sizeof(devmatchtable)/sizeof(struct cam_devequiv));i++){
if (strcmp(tmpstr, devmatchtable[i].given_dev) == 0) {
strncpy(dev_name,devmatchtable[i].real_dev, devnamelen);
found = 1;
break;
}
}
if (found == 0)
strncpy(dev_name, tmpstr, devnamelen);
/* Make sure we pass back a null-terminated string */
dev_name[devnamelen - 1] = '\0';
/* Clean up allocated memory */
free(newpath);
return(1);
}
/*
* Backwards compatible wrapper for the real open routine. This translates
* a pathname into a device name and unit number for use with the real open
* routine.
*/
struct cam_device *
cam_open_device(const char *path, int flags)
{
int unit;
char dev_name[DEV_IDLEN + 1];
/*
* cam_get_device() has already put an error message in cam_errbuf,
* so we don't need to.
*/
if (cam_get_device(path, dev_name, DEV_IDLEN + 1, &unit) == 0)
return(NULL);
return(cam_lookup_pass(dev_name, unit, flags, path, NULL));
}
/*
* Open the passthrough device for a given bus, target and lun, if the
* passthrough device exists.
*/
struct cam_device *
cam_open_btl(path_id_t path_id, target_id_t target_id, lun_id_t target_lun,
int flags, struct cam_device *device)
{
union ccb ccb;
struct periph_match_pattern *match_pat;
char *func_name = "cam_open_btl";
int fd, bufsize;
if ((fd = open(XPT_DEVICE, O_RDWR)) < 0) {
snprintf(cam_errbuf, CAM_ERRBUF_SIZE,
"%s: couldn't open %s\n%s: %s", func_name, XPT_DEVICE,
func_name, strerror(errno));
return(NULL);
}
bzero(&ccb, sizeof(union ccb));
ccb.ccb_h.func_code = XPT_DEV_MATCH;
/* Setup the result buffer */
bufsize = sizeof(struct dev_match_result);
ccb.cdm.match_buf_len = bufsize;
ccb.cdm.matches = (struct dev_match_result *)malloc(bufsize);
if (ccb.cdm.matches == NULL) {
snprintf(cam_errbuf, CAM_ERRBUF_SIZE,
"%s: couldn't malloc match buffer", func_name);
return(NULL);
}
ccb.cdm.num_matches = 0;
/* Setup the pattern buffer */
ccb.cdm.num_patterns = 1;
ccb.cdm.pattern_buf_len = sizeof(struct dev_match_pattern);
ccb.cdm.patterns = (struct dev_match_pattern *)malloc(
sizeof(struct dev_match_pattern));
if (ccb.cdm.patterns == NULL) {
snprintf(cam_errbuf, CAM_ERRBUF_SIZE,
"%s: couldn't malloc pattern buffer", func_name);
free(ccb.cdm.matches);
return(NULL);
}
ccb.cdm.patterns[0].type = DEV_MATCH_PERIPH;
match_pat = &ccb.cdm.patterns[0].pattern.periph_pattern;
/*
* We're looking for the passthrough device associated with this
* particular bus/target/lun.
*/
sprintf(match_pat->periph_name, "pass");
match_pat->path_id = path_id;
match_pat->target_id = target_id;
match_pat->target_lun = target_lun;
/* Now set the flags to indicate what we're looking for. */
match_pat->flags = PERIPH_MATCH_PATH | PERIPH_MATCH_TARGET |
PERIPH_MATCH_LUN | PERIPH_MATCH_NAME;
if (ioctl(fd, CAMIOCOMMAND, &ccb) == -1) {
sprintf(cam_errbuf, "%s: CAMIOCOMMAND ioctl failed\n"
"%s: %s", func_name, func_name, strerror(errno));
goto btl_bailout;
}
/*
* Check for an outright error.
*/
if ((ccb.ccb_h.status != CAM_REQ_CMP)
|| ((ccb.cdm.status != CAM_DEV_MATCH_LAST)
&& (ccb.cdm.status != CAM_DEV_MATCH_MORE))) {
sprintf(cam_errbuf, "%s: CAM error %#x, CDM error %d "
"returned from XPT_DEV_MATCH ccb", func_name,
ccb.ccb_h.status, ccb.cdm.status);
goto btl_bailout;
}
if (ccb.cdm.status == CAM_DEV_MATCH_MORE) {
sprintf(cam_errbuf, "%s: CDM reported more than one"
" passthrough device at %d:%d:%d!!\n",
func_name, path_id, target_id, target_lun);
goto btl_bailout;
}
if (ccb.cdm.num_matches == 0) {
sprintf(cam_errbuf, "%s: no passthrough device found at"
" %d:%d:%d", func_name, path_id, target_id,
target_lun);
goto btl_bailout;
}
switch(ccb.cdm.matches[0].type) {
case DEV_MATCH_PERIPH: {
int pass_unit;
char dev_path[256];
struct periph_match_result *periph_result;
periph_result = &ccb.cdm.matches[0].result.periph_result;
pass_unit = periph_result->unit_number;
free(ccb.cdm.matches);
free(ccb.cdm.patterns);
sprintf(dev_path, "/dev/pass%d", pass_unit);
return(cam_real_open_device(dev_path, flags, device, NULL,
NULL, 0));
break; /* NOTREACHED */
}
default:
sprintf(cam_errbuf, "%s: asked for a peripheral match, but"
" got a bus or device match??!!", func_name);
goto btl_bailout;
break; /* NOTREACHED */
}
btl_bailout:
free(ccb.cdm.matches);
free(ccb.cdm.patterns);
return(NULL);
}
struct cam_device *
cam_open_spec_device(const char *dev_name, int unit, int flags,
struct cam_device *device)
{
return(cam_lookup_pass(dev_name, unit, flags, NULL, device));
}
struct cam_device *
cam_open_pass(const char *path, int flags, struct cam_device *device)
{
return(cam_real_open_device(path, flags, device, path, NULL, 0));
}
static struct cam_device *
cam_lookup_pass(const char *dev_name, int unit, int flags,
const char *given_path, struct cam_device *device)
{
int fd;
union ccb ccb;
char dev_path[256];
char *func_name = "cam_lookup_pass";
/*
* The flags argument above only applies to the actual passthrough
* device open, not our open of the given device to find the
* passthrough device.
*/
if ((fd = open(XPT_DEVICE, O_RDWR)) < 0) {
snprintf(cam_errbuf, CAM_ERRBUF_SIZE,
"%s: couldn't open %s\n%s: %s", func_name, XPT_DEVICE,
func_name, strerror(errno));
return(NULL);
}
/* This isn't strictly necessary for the GETPASSTHRU ioctl. */
ccb.ccb_h.func_code = XPT_GDEVLIST;
/* These two are necessary for the GETPASSTHRU ioctl to work. */
strncpy(ccb.cgdl.periph_name, dev_name, DEV_IDLEN - 1);
ccb.cgdl.periph_name[DEV_IDLEN - 1] = '\0';
ccb.cgdl.unit_number = unit;
/*
* Attempt to get the passthrough device. This ioctl will fail if
* the device name is null, if the device doesn't exist, or if the
* passthrough driver isn't in the kernel.
*/
if (ioctl(fd, CAMGETPASSTHRU, &ccb) == -1) {
char tmpstr[256];
/*
* If we get ENOENT from the transport layer version of
* the CAMGETPASSTHRU ioctl, it means one of two things:
* either the device name/unit number passed in doesn't
* exist, or the passthrough driver isn't in the kernel.
*/
if (errno == ENOENT) {
snprintf(tmpstr, sizeof(tmpstr),
"\n%s: either the pass driver isn't in "
"your kernel\n%s: or %s%d doesn't exist",
func_name, func_name, dev_name, unit);
}
snprintf(cam_errbuf, sizeof(cam_errbuf),
"%s: CAMGETPASSTHRU ioctl failed\n"
"%s: %s%s", func_name, func_name, strerror(errno),
(errno == ENOENT) ? tmpstr : "");
return(NULL);
}
close(fd);
/*
* If the ioctl returned the right status, but we got an error back
* in the ccb, that means that the kernel found the device the user
* passed in, but was unable to find the passthrough device for
* the device the user gave us.
*/
if (ccb.cgdl.status == CAM_GDEVLIST_ERROR) {
sprintf(cam_errbuf, "%s: device %s%d does not exist",
func_name, dev_name, unit);
return(NULL);
}
sprintf(dev_path, "/dev/%s%d", ccb.cgdl.periph_name,
ccb.cgdl.unit_number);
return(cam_real_open_device(dev_path, flags, device, NULL,
dev_name, unit));
}
/*
* Open a given device. The path argument isn't strictly necessary, but it
* is copied into the cam_device structure as a convenience to the user.
*/
static struct cam_device *
cam_real_open_device(const char *path, int flags, struct cam_device *device,
const char *given_path, const char *given_dev_name,
int given_unit_number)
{
char newpath[MAXPATHLEN+1];
char *func_name = "cam_real_open_device";
union ccb ccb;
int fd, malloced_device = 0;
/*
* See if the user wants us to malloc a device for him.
*/
if (device == NULL) {
if ((device = (struct cam_device *)malloc(
sizeof(struct cam_device))) == NULL) {
sprintf(cam_errbuf, "%s: device structure malloc"
" failed\n%s: %s", func_name, func_name,
strerror(errno));
return(NULL);
}
malloced_device = 1;
}
/*
* If the user passed in a path, save it for him.
*/
if (given_path != NULL)
strncpy(device->device_path, given_path, MAXPATHLEN + 1);
else
device->device_path[0] = '\0';
/*
* If the user passed in a device name and unit number pair, save
* those as well.
*/
if (given_dev_name != NULL)
strncpy(device->given_dev_name, given_dev_name, DEV_IDLEN);
else
device->given_dev_name[0] = '\0';
device->given_unit_number = given_unit_number;
if ((fd = open(path, flags)) < 0) {
snprintf(cam_errbuf, CAM_ERRBUF_SIZE,
"%s: couldn't open passthrough device %s\n"
"%s: %s", func_name, path, func_name,
strerror(errno));
goto crod_bailout;
}
device->fd = fd;
bzero(&ccb, sizeof(union ccb));
/*
* Unlike the transport layer version of the GETPASSTHRU ioctl,
* we don't have to set any fields.
*/
ccb.ccb_h.func_code = XPT_GDEVLIST;
/*
* We're only doing this to get some information on the device in
* question. Otherwise, we'd have to pass in yet another
* parameter: the passthrough driver unit number.
*/
if (ioctl(fd, CAMGETPASSTHRU, &ccb) == -1) {
/*
* At this point we know the passthrough device must exist
* because we just opened it above. The only way this
* ioctl can fail is if the ccb size is wrong.
*/
sprintf(cam_errbuf, "%s: CAMGETPASSTHRU ioctl failed\n"
"%s: %s", func_name, func_name, strerror(errno));
goto crod_bailout;
}
/*
* If the ioctl returned the right status, but we got an error back
* in the ccb, that means that the kernel found the device the user
* passed in, but was unable to find the passthrough device for
* the device the user gave us.
*/
if (ccb.cgdl.status == CAM_GDEVLIST_ERROR) {
sprintf(cam_errbuf, "%s: passthrough device does not exist??!!",
func_name);
goto crod_bailout;
}
device->dev_unit_num = ccb.cgdl.unit_number;
strcpy(device->device_name, ccb.cgdl.periph_name);
device->path_id = ccb.ccb_h.path_id;
device->target_id = ccb.ccb_h.target_id;
device->target_lun = ccb.ccb_h.target_lun;
ccb.ccb_h.func_code = XPT_PATH_INQ;
if (ioctl(fd, CAMIOCOMMAND, &ccb) == -1) {
sprintf(cam_errbuf, "%s: Path Inquiry CCB failed\n"
"%s: %s", func_name, func_name, strerror(errno));
goto crod_bailout;
}
strncpy(device->sim_name, ccb.cpi.dev_name, SIM_IDLEN);
device->sim_unit_number = ccb.cpi.unit_number;
device->bus_id = ccb.cpi.bus_id;
/*
* It doesn't really matter what is in the payload for a getdev
* CCB, the kernel doesn't look at it.
*/
ccb.ccb_h.func_code = XPT_GDEV_TYPE;
if (ioctl(fd, CAMIOCOMMAND, &ccb) == -1) {
sprintf(cam_errbuf, "%s: Get Device Type CCB failed\n"
"%s: %s", func_name, func_name, strerror(errno));
goto crod_bailout;
}
device->pd_type = ccb.cgd.pd_type;
bcopy(&ccb.cgd.inq_data, &device->inq_data,
sizeof(struct scsi_inquiry_data));
device->serial_num_len = ccb.cgd.serial_num_len;
bcopy(&ccb.cgd.serial_num, &device->serial_num, device->serial_num_len);
/*
* Zero the payload, the kernel does look at the flags.
*/
bzero(&(&ccb.ccb_h)[1], sizeof(struct ccb_trans_settings));
/*
* Get transfer settings for this device.
*/
ccb.ccb_h.func_code = XPT_GET_TRAN_SETTINGS;
ccb.cts.flags = CCB_TRANS_CURRENT_SETTINGS;
if (ioctl(fd, CAMIOCOMMAND, &ccb) == -1) {
sprintf(cam_errbuf, "%s: Get Transfer Settings CCB failed\n"
"%s: %s", func_name, func_name, strerror(errno));
goto crod_bailout;
}
device->sync_period = ccb.cts.sync_period;
device->sync_offset = ccb.cts.sync_offset;
device->bus_width = ccb.cts.bus_width;
return(device);
crod_bailout:
if (malloced_device)
free(device);
return(NULL);
}
void
cam_close_device(struct cam_device *dev)
{
if (dev == NULL)
return;
cam_close_spec_device(dev);
if (dev != NULL)
free(dev);
}
void
cam_close_spec_device(struct cam_device *dev)
{
if (dev == NULL)
return;
if (dev->fd >= 0)
close(dev->fd);
}
char *
cam_path_string(struct cam_device *dev, char *str, int len)
{
if (dev == NULL) {
snprintf(str, len, "No path");
return(str);
}
snprintf(str, len, "(%s%d:%s%d:%d:%d:%d): ",
(dev->device_name[0] != '\0') ? dev->device_name : "pass",
dev->dev_unit_num,
(dev->sim_name[0] != '\0') ? dev->sim_name : "unknown",
dev->sim_unit_number,
dev->bus_id,
dev->target_id,
dev->target_lun);
return(str);
}
/*
* Malloc/duplicate a CAM device structure.
*/
struct cam_device *
cam_device_dup(struct cam_device *device)
{
char *func_name = "cam_device_dup";
struct cam_device *newdev;
if (device == NULL) {
sprintf(cam_errbuf, "%s: device is NULL", func_name);
return(NULL);
}
newdev = malloc(sizeof(struct cam_device));
bcopy(device, newdev, sizeof(struct cam_device));
return(newdev);
}
/*
* Copy a CAM device structure.
*/
void
cam_device_copy(struct cam_device *src, struct cam_device *dst)
{
char *func_name = "cam_device_copy";
if (src == NULL) {
sprintf(cam_errbuf, "%s: source device struct was NULL",
func_name);
return;
}
if (dst == NULL) {
sprintf(cam_errbuf, "%s: destination device struct was NULL",
func_name);
return;
}
bcopy(src, dst, sizeof(struct cam_device));
}
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