8322 nl: misleading-indentation

[unleashed/tickless.git] / usr / src / cmd / modload / add_drv.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <stdio.h>
#include <stdlib.h>
#include <libelf.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <wait.h>
#include <unistd.h>
#include <libintl.h>
#include <sys/modctl.h>
#include <sys/systeminfo.h>
#include <string.h>
#include <limits.h>
#include <locale.h>
#include <ftw.h>
#include <sys/sunddi.h>
#include <libdevinfo.h>
#include <sys/sysmacros.h>
#include <fcntl.h>
#include <zone.h>
#include "addrem.h"
#include "errmsg.h"
#include "plcysubr.h"

/*
 * globals needed for libdevinfo - there is no way to pass
 * private data to the find routine.
 */
struct dev_list {
        int clone;
        char *dev_name;
        char *driver_name;
        struct dev_list *next;
};

static char *kelf_desc = NULL;
static int kelf_type = ELFCLASSNONE;

static char *new_drv;
static struct dev_list *conflict_lst = NULL;

static int module_not_found(char *, char *, int, char **, int *);
static void usage();
static int update_minor_perm(char *, char *);
static int devfs_update_minor_perm(char *, char *);
static int update_driver_classes(char *, char *);
static int drv_name_conflict(di_node_t);
static int devfs_node(di_node_t node, void *arg);
static int drv_name_match(char *, int, char *, char *);
static void print_drv_conflict_info(int);
static void check_dev_dir(int);
static int dev_node(const char *, const struct stat *, int, struct FTW *);
static void free_conflict_list(struct dev_list *);
static int clone(di_node_t node);
static int elf_type(char *, char **, int *);
static int correct_location(char *, char **, int *);
static int isaspec_drvmod_discovery();
static void remove_slashes(char *);
static int update_extra_privs(char *, char *privlist);
static int ignore_root_basedir();

int
main(int argc, char *argv[])
{
        int opt;
        major_t major_num;
        char driver_name[FILENAME_MAX + 1];
        int driver_name_size = sizeof (driver_name);
        char path_driver_name[MAXPATHLEN];
        int path_driver_name_size = sizeof (path_driver_name);
        char *perms = NULL;
        char *aliases = NULL;
        char *classes = NULL;
        char *policy = NULL;
        char *priv = NULL;
        int noload_flag = 0;
        int verbose_flag = 0;
        int force_flag = 0;
        int update_only = 0;
        int i_flag = 0;
        int c_flag = 0;
        int m_flag = 0;
        int cleanup_flag = 0;
        int server = 0;
        char *basedir = NULL;
        int is_unique;
        char *slash;
        int conflict;
        di_node_t root_node;    /* for device tree snapshot */
        char *drvelf_desc = NULL;
        int drvelf_type = ELFCLASSNONE;
        int config_flags;

        moddir = NULL;

        (void) setlocale(LC_ALL, "");
#if     !defined(TEXT_DOMAIN)   /* Should be defined by cc -D */
#define TEXT_DOMAIN "SYS_TEST"  /* Use this only if it weren't */
#endif
        (void) textdomain(TEXT_DOMAIN);

        /*  must be run by root */

        if (geteuid() != 0) {
                (void) fprintf(stderr, gettext(ERR_NOT_ROOT));
                exit(1);
        }

        while ((opt = getopt(argc, argv, "vfm:ni:b:c:p:P:u")) != EOF) {
                switch (opt) {
                case 'm' :
                        m_flag = 1;
                        perms = optarg;
                        break;
                case 'f':
                        force_flag++;
                        break;
                case 'v':
                        verbose_flag++;
                        break;
                case 'n':
                        noload_flag++;
                        break;
                case 'i' :
                        i_flag = 1;
                        aliases = optarg;
                        if (check_space_within_quote(aliases) == ERROR) {
                                (void) fprintf(stderr, gettext(ERR_NO_SPACE),
                                    aliases);
                                exit(1);
                        }
                        break;
                case 'b' :
                        server = 1;
                        basedir = optarg;
                        if (strcmp(basedir, "/") == 0 &&
                            ignore_root_basedir()) {
                                server = 0;
                                basedir = NULL;
                        }
                        break;
                case 'c':
                        c_flag = 1;
                        classes = optarg;
                        break;
                case 'p':
                        policy = optarg;
                        break;
                case 'P':
                        priv = optarg;
                        break;
                case 'u':
                        /*
                         * Update binding files and kernel but
                         * do not load or configure devices.
                         */
                        update_only = 1;
                        break;
                case '?' :
                default:
                        usage();
                        exit(1);
                }
        }


        if (argv[optind] != NULL) {
                if (strlcpy(driver_name, argv[optind], driver_name_size) >=
                    driver_name_size) {
                        (void) fprintf(stderr, gettext(ERR_DRVNAME_TOO_LONG),
                            driver_name_size, argv[optind]);
                        exit(1);
                }

                /*
                 * check for extra args
                 */
                if ((optind + 1) != argc) {
                        usage();
                        exit(1);
                }

        } else {
                usage();
                exit(1);
        }

        if (getzoneid() != GLOBAL_ZONEID) {
                (void) fprintf(stderr, gettext(ERR_NOT_GLOBAL_ZONE));
                exit(1);
        }

        /*
         * Fail if add_drv was invoked with a pathname prepended to the
         * driver_name argument.
         *
         * Check driver_name for any '/'s. If found, we assume that caller
         * is trying to specify a pathname.
         */

        slash = strchr(driver_name, '/');
        if (slash) {
                remove_slashes(driver_name);

                /* extract module name out of path */
                slash = strrchr(driver_name, '/');

                if (slash != NULL) {
                        (void) fprintf(stderr, gettext(ERR_PATH_SPEC),
                            driver_name);
                        (void) fprintf(stderr, gettext(ERR_INSTALL_FAIL),
                            ++slash);
                        exit(1);
                }
        }
        new_drv = driver_name;

        /* set up add_drv filenames */
        if ((build_filenames(basedir)) == ERROR) {
                exit(1);
        }

        /* must be only running version of add_drv/rem_drv */
        enter_lock();

        if ((check_perms_aliases(m_flag, i_flag)) == ERROR)
                err_exit();

        if ((check_name_to_major(R_OK | W_OK)) == ERROR)
                err_exit();

        /*
         * check validity of options
         */
        if (m_flag) {
                if ((check_perm_opts(perms)) == ERROR) {
                        usage();
                        err_exit();
                }
        }

        if (i_flag) {
                if (aliases != NULL)
                        if ((aliases_unique(aliases)) == ERROR)
                                err_exit();
        }

        /* -u and -n/-b are mutually exclusive */
        if (update_only && (noload_flag || server)) {
                usage();
                err_exit();
        }

        /* update kernel unless -b or -n */
        if (noload_flag == 0 && server == 0 &&
            priv != NULL && check_priv_entry(priv, 1) != 0)
                err_exit();

        if (policy != NULL &&
            (policy = check_plcy_entry(policy, driver_name, B_FALSE)) == NULL) {
                err_exit();
        }

        if ((unique_driver_name(driver_name, name_to_major,
            &is_unique)) == ERROR)
                err_exit();

        if (is_unique == NOT_UNIQUE) {
                (void) fprintf(stderr, gettext(ERR_NOT_UNIQUE), driver_name);
                err_exit();
        }

        if (noload_flag == 0 && server == 0) {
                if (elf_type("/dev/ksyms", &kelf_desc, &kelf_type) == ERROR) {
                        (void) fprintf(stderr, gettext(ERR_KERNEL_ISA));
                        err_exit();
                }

                if (module_not_found(driver_name, path_driver_name,
                    path_driver_name_size, &drvelf_desc, &drvelf_type) ==
                    ERROR) {
                        (void) fprintf(stderr, gettext(ERR_NOMOD), driver_name);
                        err_exit();
                }

                /*
                 * If the driver location is incorrect but the kernel and driver
                 * are of the same ISA, suggest a fix.  If the driver location
                 * is incorrect and the ISA's mismatch, notify the user that
                 * this driver can not be loaded on this kernel.  In both cases,
                 * do not attempt to load the driver module.
                 */

                if (correct_location(path_driver_name, &drvelf_desc,
                    (&drvelf_type)) == ERROR) {
                        noload_flag = 1;
                        if (kelf_type == drvelf_type) {
                                (void) fprintf(stderr,
                                    gettext(ERR_SOL_LOCATION), driver_name,
                                    driver_name);
                        } else {
                                (void) fprintf(stderr,
                                    gettext(ERR_NOT_LOADABLE),
                                    drvelf_desc, driver_name, kelf_desc);
                        }

                /*
                 * The driver location is correct.  Verify that the kernel ISA
                 * and driver ISA match.  If they do not match, produce an error
                 * message and do not attempt to load the module.
                 */

                } else if (kelf_type != drvelf_type) {
                        noload_flag = 1;
                        (void) fprintf(stderr, gettext(ERR_ISA_MISMATCH),
                            kelf_desc, driver_name, drvelf_desc);
                        (void) fprintf(stderr, gettext(ERR_NOT_LOADABLE),
                            drvelf_desc, driver_name, kelf_desc);
                }


                /*
                 * Check for a more specific driver conflict - see
                 * PSARC/1995/239
                 * Note that drv_name_conflict() can return -1 for error
                 * or 1 for a conflict.  Since the default is to fail unless
                 * the -f flag is specified, we don't bother to differentiate.
                 */
                if ((root_node = di_init("/", DINFOSUBTREE | DINFOMINOR))
                    == DI_NODE_NIL) {
                        (void) fprintf(stderr, gettext(ERR_DEVTREE));
                        conflict = -1;
                } else {
                        conflict = drv_name_conflict(root_node);
                        di_fini(root_node);
                }

                if (conflict) {
                        /*
                         * if the force flag is not set, we fail here
                         */
                        if (!force_flag) {
                                (void) fprintf(stderr,
                                    gettext(ERR_INSTALL_FAIL), driver_name);
                                (void) fprintf(stderr, "Device managed by "
                                    "another driver.\n");
                                if (verbose_flag)
                                        print_drv_conflict_info(force_flag);
                                err_exit();
                        }
                        /*
                         * The force flag was specified so we print warnings
                         * and install the driver anyways
                         */
                        if (verbose_flag)
                                print_drv_conflict_info(force_flag);
                        free_conflict_list(conflict_lst);
                }
        }

        if ((update_name_to_major(driver_name, &major_num, server)) == ERROR) {
                err_exit();
        }

        cleanup_flag |= CLEAN_NAM_MAJ;


        if (m_flag) {
                cleanup_flag |= CLEAN_MINOR_PERM;
                if (update_minor_perm(driver_name, perms) == ERROR) {
                        remove_entry(cleanup_flag, driver_name);
                        err_exit();
                }
        }

        if (i_flag) {
                cleanup_flag |= CLEAN_DRV_ALIAS;
                if (update_driver_aliases(driver_name, aliases) == ERROR) {
                        remove_entry(cleanup_flag, driver_name);
                        err_exit();

                }
        }

        if (c_flag) {
                cleanup_flag |= CLEAN_DRV_CLASSES;
                if (update_driver_classes(driver_name, classes) == ERROR) {
                        remove_entry(cleanup_flag, driver_name);
                        err_exit();

                }
        }

        if (priv != NULL) {
                cleanup_flag |= CLEAN_DRV_PRIV;
                if (update_extra_privs(driver_name, priv) == ERROR) {
                        remove_entry(cleanup_flag, driver_name);
                        err_exit();
                }
        }

        if (policy != NULL) {
                cleanup_flag |= CLEAN_DEV_POLICY;
                if (update_device_policy(device_policy, policy, B_FALSE)
                    == ERROR) {
                        remove_entry(cleanup_flag, driver_name);
                        err_exit();
                }
        }

        if (noload_flag || server) {
                (void) fprintf(stderr, gettext(BOOT_CLIENT));
        } else {
                /*
                 * paranoia - if we crash whilst configuring the driver
                 * this might avert possible file corruption.
                 */
                sync();

                config_flags = 0;
                if (verbose_flag)
                        config_flags |= CONFIG_DRV_VERBOSE;
                if (update_only)
                        config_flags |= CONFIG_DRV_UPDATE_ONLY;

                if (config_driver(driver_name, major_num, aliases, classes,
                    cleanup_flag, config_flags) == ERROR) {
                        err_exit();
                }
                if (m_flag) {
                        if (devfs_update_minor_perm(basedir,
                            driver_name) == ERROR) {
                                err_exit();
                        }
                }
                if (update_only) {
                        (void) fprintf(stderr, gettext(INFO_UPDATE_ONLY),
                            driver_name);
                } else if (noload_flag) {
                        (void) fprintf(stderr, gettext(ERR_CONFIG_NOLOAD),
                            driver_name);
                } else {
                        load_driver(driver_name, verbose_flag);
                }
        }

        if (create_reconfig(basedir) == ERROR)
                (void) fprintf(stderr, gettext(ERR_CREATE_RECONFIG));

        cleanup_moddir();
        exit_unlock();

        if (verbose_flag) {
                (void) fprintf(stderr, gettext(DRIVER_INSTALLED), driver_name);
        }

        return (NOERR);
}

/*
 *      Searches for the driver module along the module path (returned
 *      from modctl) and returns a string (in drv_path) representing the path
 *      where drv_name was found.  ERROR is returned if function is unable
 *      to locate drv_name.
 */
int
module_not_found(char *drv_name, char *drv_path, int drv_path_size,
    char **drvelf_desc, int *drvelf_type_ptr)
{
        struct stat buf;
        char data [MAXMODPATHS];
        char pathsave [MAXMODPATHS];
        char *next = data;
        struct drvmod_dir *curdir = NULL;
        char foundpath[MAXPATHLEN];

        if (modctl(MODGETPATH, NULL, data) != 0) {
                (void) fprintf(stderr, gettext(ERR_MODPATH));
                return (ERROR);
        }
        (void) strcpy(pathsave, data);
        next = strtok(data, MOD_SEP);

        if (isaspec_drvmod_discovery() == ERROR)
                err_exit();

        curdir = moddir;
        while (curdir != NULL) {
                while (next != NULL) {
                        (void) snprintf(foundpath, sizeof (foundpath),
                            "%s/drv/%s/%s", next, curdir->direc, drv_name);
                        if ((stat(foundpath, &buf) == 0) &&
                            ((buf.st_mode & S_IFMT) == S_IFREG)) {
                                if (elf_type(foundpath, drvelf_desc,
                                    drvelf_type_ptr) == ERROR) {
                                        (void) fprintf(stderr,
                                            gettext(ERR_INSTALL_FAIL),
                                            drv_name);
                                        err_exit();
                                }
                                remove_slashes(foundpath);

                                if (strlcpy(drv_path, foundpath, drv_path_size)
                                    >= drv_path_size) {
                                        return (ERROR);
                                }

                                return (NOERR);
                        }
                        next = strtok((char *)NULL, MOD_SEP);
                }
                (void) strcpy(data, pathsave);
                next = strtok(data, MOD_SEP);
                curdir = curdir->next;
        }

        return (ERROR);
}

static void
usage()
{
        (void) fprintf(stderr, gettext(USAGE));
}

static int
update_driver_classes(
        char *driver_name,
        char *classes)
{
        /* make call to update the classes file */
        return (append_to_file(driver_name, classes, driver_classes,
            ' ', "\t", 0));
}

static int
update_minor_perm(
        char *driver_name,
        char *perm_list)
{
        return (append_to_minor_perm(driver_name, perm_list, minor_perm));
}


/*
 * Complete the minor perm update by communicating the minor perm
 * data to the kernel.  This information is used by devfs to ensure
 * that devices always have the correct permissions when attached.
 * The minor perm file must be updated and the driver configured
 * in the system for this step to complete correctly.
 */
static int
devfs_update_minor_perm(
        char *basedir,
        char *driver_name)
{
        int rval = 0;

        if (basedir == NULL || (strcmp(basedir, "/") == 0)) {
                if (devfs_add_minor_perm(driver_name,
                    log_minorperm_error) != 0) {
                        (void) fprintf(stderr,
                            gettext(ERR_UPDATE_PERM), driver_name);
                }
        }
        return (rval);
}

static int
update_extra_privs(
        char *driver_name,
        char *privlist)
{
        return (append_to_file(driver_name, privlist, extra_privs,
            ',', ":", 0));
}

/*
 * Check to see if the driver we are adding is a more specific
 * driver for a device already attached to a less specific driver.
 * In other words, see if this driver comes earlier on the compatible
 * list of a device already attached to another driver.
 * If so, the new node will not be created (since the device is
 * already attached) but when the system reboots, it will attach to
 * the new driver but not have a node - we need to warn the user
 * if this is the case.
 */
static int
drv_name_conflict(di_node_t root_node)
{
        /*
         * walk the device tree checking each node
         */
        if (di_walk_node(root_node, DI_WALK_SIBFIRST, NULL, devfs_node) == -1) {
                free_conflict_list(conflict_lst);
                conflict_lst = (struct dev_list *)NULL;
                (void) fprintf(stderr, gettext(ERR_DEVTREE));
                return (-1);
        }

        if (conflict_lst == NULL)
                /* no conflicts found */
                return (0);
        else
                /* conflicts! */
                return (1);
}

/*
 * called via di_walk_node().
 * called for each node in the device tree.  We skip nodes that:
 *      1. are not hw nodes (since they cannot have generic names)
 *      2. that do not have a compatible property
 *      3. whose node name = binding name.
 *      4. nexus nodes - the name of a generic nexus node would
 *      not be affected by a driver change.
 * Otherwise, we parse the compatible property, if we find a
 * match with the new driver before we find a match with the
 * current driver, then we have a conflict and we save the
 * node away.
 */
/*ARGSUSED*/
static int
devfs_node(di_node_t node, void *arg)
{
        char *binding_name, *node_name, *compat_names, *devfsnm;
        struct dev_list *new_entry;
        char strbuf[MAXPATHLEN];
        int n_names;

        /*
         * if there is no compatible property, we don't
         * have to worry about any conflicts.
         */
        if ((n_names = di_compatible_names(node, &compat_names)) <= 0)
                return (DI_WALK_CONTINUE);

        /*
         * if the binding name and the node name match, then
         * either no driver existed that could be bound to this node,
         * or the driver name is the same as the node name.
         */
        binding_name = di_binding_name(node);
        node_name = di_node_name(node);
        if ((binding_name == NULL) || (strcmp(node_name, binding_name) == 0))
                return (DI_WALK_CONTINUE);

        /*
         * we can skip nexus drivers since they do not
         * have major/minor number info encoded in their
         * /devices name and therefore won't change.
         */
        if (di_driver_ops(node) & DI_BUS_OPS)
                return (DI_WALK_CONTINUE);

        /*
         * check for conflicts
         * If we do find that the new driver is a more specific driver
         * than the driver already attached to the device, we'll save
         * away the node name for processing later.
         */
        if (drv_name_match(compat_names, n_names, binding_name, new_drv)) {
                devfsnm = di_devfs_path(node);
                (void) snprintf(strbuf, sizeof (strbuf),
                    "%s%s", DEVFS_ROOT, devfsnm);
                di_devfs_path_free(devfsnm);
                new_entry = (struct dev_list *)calloc(1,
                    sizeof (struct dev_list));
                if (new_entry == (struct dev_list *)NULL) {
                        (void) fprintf(stderr, gettext(ERR_NO_MEM));
                        err_exit();
                }
                /* save the /devices name */
                if ((new_entry->dev_name = strdup(strbuf)) == NULL) {
                        (void) fprintf(stderr, gettext(ERR_NO_MEM));
                        free(new_entry);
                        err_exit();
                }
                /* save the driver name */
                if ((new_entry->driver_name = strdup(di_driver_name(node)))
                    == NULL) {
                        (void) fprintf(stderr, gettext(ERR_NO_MEM));
                        free(new_entry->dev_name);
                        free(new_entry);
                        err_exit();
                }
                /* check to see if this is a clone device */
                if (clone(node))
                        new_entry->clone = 1;

                /* add it to the list */
                new_entry->next = conflict_lst;
                conflict_lst = new_entry;
        }

        return (DI_WALK_CONTINUE);
}

static int
clone(di_node_t node)
{
        di_minor_t minor = DI_MINOR_NIL;

        while ((minor = di_minor_next(node, minor)) != DI_MINOR_NIL) {
                if (di_minor_type(minor) == DDM_ALIAS)
                        return (1);
        }
        return (0);
}
/*
 * check to see if the new_name shows up on the compat list before
 * the cur_name (driver currently attached to the device).
 */
static int
drv_name_match(char *compat_names, int n_names, char *cur_name, char *new_name)
{
        int i, ret = 0;

        if (strcmp(cur_name, new_name) == 0)
                return (0);

        /* parse the coompatible list */
        for (i = 0; i < n_names; i++) {
                if (strcmp(compat_names, new_name) == 0) {
                        ret = 1;
                        break;
                }
                if (strcmp(compat_names, cur_name) == 0) {
                        break;
                }
                compat_names += strlen(compat_names) + 1;
        }
        return (ret);
}

/*
 * A more specific driver is being added for a device already attached
 * to a less specific driver.  Print out a general warning and if
 * the force flag was passed in, give the user a hint as to what
 * nodes may be affected in /devices and /dev
 */
static void
print_drv_conflict_info(int force)
{
        struct dev_list *ptr;

        if (conflict_lst == NULL)
                return;
        if (force) {
                (void) fprintf(stderr,
                    "\nA reconfiguration boot must be performed to "
                    "complete the\n");
                (void) fprintf(stderr, "installation of this driver.\n");
        }

        if (force) {
                (void) fprintf(stderr,
                    "\nThe following entries in /devices will be "
                    "affected:\n\n");
        } else {
                (void) fprintf(stderr,
                    "\nDriver installation failed because the following\n");
                (void) fprintf(stderr,
                    "entries in /devices would be affected:\n\n");
        }

        ptr = conflict_lst;
        while (ptr != NULL) {
                (void) fprintf(stderr, "\t%s", ptr->dev_name);
                if (ptr->clone)
                        (void) fprintf(stderr, " (clone device)\n");
                else
                        (void) fprintf(stderr, "[:*]\n");
                (void) fprintf(stderr, "\t(Device currently managed by driver "
                    "\"%s\")\n\n", ptr->driver_name);
                ptr = ptr->next;
        }
        check_dev_dir(force);
}

/*
 * use nftw to walk through /dev looking for links that match
 * an entry in the conflict list.
 */
static void
check_dev_dir(int force)
{
        int  walk_flags = FTW_PHYS | FTW_MOUNT;
        int ft_depth = 15;

        if (force) {
                (void) fprintf(stderr, "\nThe following entries in /dev will "
                    "be affected:\n\n");
        } else {
                (void) fprintf(stderr, "\nThe following entries in /dev would "
                    "be affected:\n\n");
        }

        (void) nftw("/dev", dev_node, ft_depth, walk_flags);

        (void) fprintf(stderr, "\n");
}

/*
 * checks a /dev link to see if it matches any of the conlficting
 * /devices nodes in conflict_lst.
 */
/*ARGSUSED1*/
static int
dev_node(const char *node, const struct stat *node_stat, int flags,
        struct FTW *ftw_info)
{
        char linkbuf[MAXPATHLEN];
        struct dev_list *ptr;

        if (readlink(node, linkbuf, MAXPATHLEN) == -1)
                return (0);

        ptr = conflict_lst;

        while (ptr != NULL) {
                if (strstr(linkbuf, ptr->dev_name) != NULL)
                        (void) fprintf(stderr, "\t%s\n", node);
                ptr = ptr->next;
        }
        return (0);
}


static void
free_conflict_list(struct dev_list *list)
{
        struct dev_list *save;

        /* free up any dev_list structs we allocated. */
        while (list != NULL) {
                save = list;
                list = list->next;
                free(save->dev_name);
                free(save);
        }
}

int
elf_type(char *file, char **elfdesc, int *elf_type_ptr)
{
        int fd;
        Elf *elf;
        char *ident;

        if ((fd = open(file, O_RDONLY)) < 0) {
                (void) fprintf(stderr, gettext(ERR_CANNOT_OPEN), file,
                    strerror(errno));
                return (ERROR);
        }
        if (elf_version(EV_CURRENT) == EV_NONE) {
                (void) fprintf(stderr, gettext(ERR_ELF_VERSION),
                    elf_errmsg(-1));
                (void) close(fd);
                return (ERROR);
        }
        elf = elf_begin(fd, ELF_C_READ, NULL);
        if (elf_kind(elf) != ELF_K_ELF) {
                (void) fprintf(stderr, gettext(ERR_ELF_KIND), file);
                (void) elf_end(elf);
                (void) close(fd);
                return (ERROR);
        }
        ident = elf_getident(elf, 0);
        if (ident[EI_CLASS] == ELFCLASS32) {
                *elfdesc = "32";
                *elf_type_ptr = ELFCLASS32;
        } else if (ident[EI_CLASS] == ELFCLASS64) {
                *elfdesc = "64";
                *elf_type_ptr = ELFCLASS64;
        } else {
                *elfdesc = "none";
                *elf_type_ptr = ELFCLASSNONE;
        }
        (void) elf_end(elf);
        (void) close(fd);
        return (NOERR);
}

int
correct_location(char *drv_path, char **drvelf_desc, int *drvelf_type_ptr)
{

        char copy_drv_path[MAXPATHLEN];
        char *token = copy_drv_path;

        (void) strcpy(copy_drv_path, drv_path);

        if (elf_type(drv_path, drvelf_desc, drvelf_type_ptr) == ERROR) {
                err_exit();
        }
        token = strtok(copy_drv_path, DIR_SEP);
        while (token != NULL) {
                if (strcmp("drv", token) == 0) {
                        token = strtok((char *)NULL, DIR_SEP);
                        if (strcmp(DRVDIR64, token) == 0) {
                                if (*drvelf_type_ptr == ELFCLASS64)
                                        return (NOERR);
                                (void) fprintf(stderr, gettext(ERR_LOCATION),
                                    *drvelf_desc, drv_path);
                                return (ERROR);
                        } else {
                                if (*drvelf_type_ptr == ELFCLASS32)
                                        return (NOERR);
                                (void) fprintf(stderr, gettext(ERR_LOCATION),
                                    *drvelf_desc, drv_path);
                                return (ERROR);
                        }
                } else {
                        token = strtok((char *)NULL, DIR_SEP);
                }
        }
        return (ERROR);
}

/*
 * Creates a two-element linked list of isa-specific subdirectories to
 * search for each driver, which is is used by the function
 * module_not_found() to convert the isa-independent modpath into an
 * isa-specific path .  The list is ordered depending on the machine
 * architecture and instruction set architecture, corresponding to the
 * order in which module_not_found() will search for the driver.  This
 * routine relies on an architecture not having more than two
 * sub-architectures (e.g., sparc/sparcv9 or i386/amd64).
 */
int
isaspec_drvmod_discovery()
{
        char arch[SYS_NMLN];

        moddir = (struct drvmod_dir *)calloc(1, sizeof (struct drvmod_dir));
        if (moddir == NULL) {
                (void) fprintf(stderr, gettext(ERR_NO_MEM));
                return (ERROR);
        }

        if (sysinfo(SI_ARCHITECTURE, arch, sizeof (arch)) == -1) {
                (void) fprintf(stderr, gettext(ERR_SYSINFO_ARCH));
                return (ERROR);
        }

        if (strcmp(arch, "sparc") == 0 || strcmp(arch, "i386") == 0) {
                moddir->next = (struct drvmod_dir *)
                    calloc(1, sizeof (struct drvmod_dir));
                if (moddir->next == NULL) {
                        (void) fprintf(stderr, gettext(ERR_NO_MEM));
                        return (ERROR);
                }
                if (kelf_type == ELFCLASS64) {
                        (void) strcpy(moddir->direc, DRVDIR64);
                        (void) strcpy(moddir->next->direc, "");
                } else {
                        (void) strcpy(moddir->direc, "");
                        (void) strcpy(moddir->next->direc, DRVDIR64);
                }
                moddir->next->next = NULL;
                return (NOERR);
        } else {
                (void) fprintf(stderr, gettext(ERR_ARCH_NOT_SUPPORTED), arch);
                return (ERROR);
        }
}

void
remove_slashes(char *path)
{
        char *slash = path;
        char *remain_str;
        int pathlen;

        while ((slash = strchr(slash, '/')) != NULL) {
                remain_str = ++slash;
                while (*remain_str == '/')
                        ++remain_str;
                if (slash != remain_str)
                        (void) strcpy(slash, remain_str);
        }

        pathlen = strlen(path);
        if ((pathlen > 1) && path[pathlen - 1] == '/')
                path[pathlen - 1] = '\0';
}

/*
 * This is for ITU floppies to add packages to the miniroot
 */
static int
ignore_root_basedir(void)
{
        struct stat statbuf;

        return (stat("/ADD_DRV_IGNORE_ROOT_BASEDIR", &statbuf) == 0);
}