libtopo/common/sw.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 (c) 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <libnvpair.h>
#include <fm/topo_mod.h>

#include <sys/fm/protocol.h>
#include <sys/types.h>

#include <topo_method.h>
#include <topo_subr.h>
#include <sw.h>

static int sw_fmri_nvl2str(topo_mod_t *, tnode_t *, topo_version_t,
    nvlist_t *, nvlist_t **);
static int sw_fmri_create(topo_mod_t *, tnode_t *, topo_version_t,
    nvlist_t *, nvlist_t **);

static const topo_method_t sw_methods[] = {
    { TOPO_METH_NVL2STR, TOPO_METH_NVL2STR_DESC, TOPO_METH_NVL2STR_VERSION,
        TOPO_STABILITY_INTERNAL, sw_fmri_nvl2str },
    { TOPO_METH_FMRI, TOPO_METH_FMRI_DESC, TOPO_METH_FMRI_VERSION,
        TOPO_STABILITY_INTERNAL, sw_fmri_create },
    { NULL }
};

static int sw_enum(topo_mod_t *, tnode_t *, const char *, topo_instance_t,
    topo_instance_t, void *, void *);
static void sw_release(topo_mod_t *, tnode_t *);

static const topo_modops_t sw_ops =
    { sw_enum, sw_release };

static const topo_modinfo_t sw_info =
    { "sw", FM_FMRI_SCHEME_SW, SW_VERSION, &sw_ops };

int
sw_init(topo_mod_t *mod, topo_version_t version)
{
    if (getenv("TOPOSWDEBUG"))
        topo_mod_setdebug(mod);
    topo_mod_dprintf(mod, "initializing sw builtin\n");

    if (version != SW_VERSION)
        return (topo_mod_seterrno(mod, EMOD_VER_NEW));

    if (topo_mod_register(mod, &sw_info, TOPO_VERSION) != 0) {
        topo_mod_dprintf(mod, "failed to register sw_info: "
            "%s\n", topo_mod_errmsg(mod));
        return (-1);
    }

    return (0);
}

void
sw_fini(topo_mod_t *mod)
{
    topo_mod_unregister(mod);
}

static int
sw_get_optl_string(nvlist_t *nvl, char *name, char **dest)
{
    if (nvlist_lookup_string(nvl, name, dest) == 0) {
        return (0);
    } else {
        *dest = NULL;
        return (errno == ENOENT ? 0 : 1);
    }
}

static int
sw_get_optl_int64(nvlist_t *nvl, char *name, int64_t *dest)
{
    if (nvlist_lookup_int64(nvl, name, dest) == 0) {
        return (0);
    } else {
        *dest = -1;
        return (errno == ENOENT ? 0 : 1);
    }
}

static int
sw_get_optl_nvlist(nvlist_t *nvl, char *name, nvlist_t **dest)
{
    if (nvlist_lookup_nvlist(nvl, name, dest) == 0) {
        return (0);
    } else {
        *dest = NULL;
        return (errno == ENOENT ? 0 : 1);
    }
}

static int
sw_add_optl_string(nvlist_t *nvl, char *name, char *val)
{
    if (val)
        return (nvlist_add_string(nvl, name, val) != 0);
    else
        return (0);
}

/*ARGSUSED*/
static int
sw_fmri_create(topo_mod_t *mod, tnode_t *node, topo_version_t version,
    nvlist_t *in, nvlist_t **out)
{
    nvlist_t *args, *fmri = NULL, *obj = NULL, *site = NULL, *ctxt = NULL;
    topo_mod_errno_t moderr;
    int err = 0;

    char *obj_path, *obj_root;
    nvlist_t *obj_pkg;

    char *site_token, *site_module, *site_file, *site_func;
    int64_t site_line;

    char *ctxt_origin, *ctxt_execname, *ctxt_zone;
    int64_t ctxt_pid, ctxt_ctid;
    char **ctxt_stack;
    uint_t ctxt_stackdepth;


    if (version > TOPO_METH_FMRI_VERSION)
        return (topo_mod_seterrno(mod, EMOD_VER_NEW));

    if (nvlist_lookup_nvlist(in, TOPO_METH_FMRI_ARG_NVL, &args) != 0)
        return (topo_mod_seterrno(mod, EMOD_METHOD_INVAL));

    if (nvlist_lookup_string(args, "obj_path", &obj_path) != 0)
        return (topo_mod_seterrno(mod, EMOD_NVL_INVAL));
    err |= sw_get_optl_string(args, "obj_root", &obj_root);
    err |= sw_get_optl_nvlist(args, "obj-pkg", &obj_pkg);

    err |= sw_get_optl_string(args, "site_token", &site_token);
    err |= sw_get_optl_string(args, "site_module", &site_module);
    err |= sw_get_optl_string(args, "site_file", &site_file);
    err |= sw_get_optl_string(args, "site_func", &site_func);
    err |= sw_get_optl_int64(args, "site_line", &site_line);

    err |= sw_get_optl_string(args, "ctxt_origin", &ctxt_origin);
    err |= sw_get_optl_string(args, "ctxt_execname", &ctxt_execname);
    err |= sw_get_optl_string(args, "ctxt_zone", &ctxt_zone);
    err |= sw_get_optl_int64(args, "ctxt_pid", &ctxt_pid);
    err |= sw_get_optl_int64(args, "ctxt_ctid", &ctxt_ctid);

    if (nvlist_lookup_string_array(args, "stack", &ctxt_stack,
        &ctxt_stackdepth) != 0) {
        if (errno == ENOENT)
            ctxt_stack = NULL;
        else
            err++;
    }

    if (err)
        (void) topo_mod_seterrno(mod, EMOD_FMRI_NVL);

    if (topo_mod_nvalloc(mod, &fmri, NV_UNIQUE_NAME) != 0 ||
        topo_mod_nvalloc(mod, &obj, NV_UNIQUE_NAME) != 0) {
        moderr = EMOD_NOMEM;
        goto out;
    }

    /*
     * Add standard FMRI members 'version' and 'scheme'.
     */
    err |= nvlist_add_uint8(fmri, FM_VERSION, FM_SW_SCHEME_VERSION);
    err |= nvlist_add_string(fmri, FM_FMRI_SCHEME, FM_FMRI_SCHEME_SW);

    /*
     * Build up the 'object' nvlist.
     */
    err |= nvlist_add_string(obj, FM_FMRI_SW_OBJ_PATH, obj_path);
    err |= sw_add_optl_string(obj, FM_FMRI_SW_OBJ_ROOT, obj_root);
    if (obj_pkg)
        err |= nvlist_add_nvlist(obj, FM_FMRI_SW_OBJ_PKG, obj_pkg);

    /*
     * Add 'object' to the fmri.
     */
    if (err == 0)
        err |= nvlist_add_nvlist(fmri, FM_FMRI_SW_OBJ, obj);

    if (err) {
        moderr = EMOD_NOMEM;
        goto out;
    }

    /*
     * Do we have anything for a 'site' nvlist?
     */
    if (site_token == NULL && site_module == NULL && site_file == NULL &&
        site_func == NULL && site_line == -1)
        goto context;

    /*
     * Allocate and build 'site' nvlist.
     */
    if (topo_mod_nvalloc(mod, &site, NV_UNIQUE_NAME) != 0) {
        moderr = EMOD_NOMEM;
        goto out;
    }

    err |= sw_add_optl_string(site, FM_FMRI_SW_SITE_TOKEN, site_token);
    err |= sw_add_optl_string(site, FM_FMRI_SW_SITE_MODULE, site_module);
    err |= sw_add_optl_string(site, FM_FMRI_SW_SITE_FILE, site_file);
    err |= sw_add_optl_string(site, FM_FMRI_SW_SITE_FUNC, site_func);
    if ((site_token || site_module || site_file || site_func) &&
        site_line != -1)
        err |= nvlist_add_int64(site, FM_FMRI_SW_SITE_LINE, site_line);

    /*
     * Add 'site' to the fmri.
     */
    if (err == 0)
        err |= nvlist_add_nvlist(fmri, FM_FMRI_SW_SITE, site);

    if (err) {
        moderr = EMOD_NOMEM;
        goto out;
    }

context:
    /*
     * Do we have anything for a 'context' nvlist?
     */
    if (ctxt_origin || ctxt_execname || ctxt_zone ||
        ctxt_pid != -1 || ctxt_ctid != -1 || ctxt_stack != NULL)
        goto out;

    /*
     * Allocate and build 'context' nvlist.
     */
    if (topo_mod_nvalloc(mod, &ctxt, NV_UNIQUE_NAME) != 0) {
        moderr = EMOD_NOMEM;
        goto out;
    }

    err |= sw_add_optl_string(ctxt, FM_FMRI_SW_CTXT_ORIGIN, ctxt_origin);
    err |= sw_add_optl_string(ctxt, FM_FMRI_SW_CTXT_EXECNAME,
        ctxt_execname);
    err |= sw_add_optl_string(ctxt, FM_FMRI_SW_CTXT_ZONE, ctxt_zone);
    if (ctxt_pid != -1)
        err |= nvlist_add_int64(ctxt, FM_FMRI_SW_CTXT_PID, ctxt_pid);
    if (ctxt_ctid != -1)
        err |= nvlist_add_int64(ctxt, FM_FMRI_SW_CTXT_CTID, ctxt_ctid);
    if (ctxt_stack != NULL)
        err |= nvlist_add_string_array(ctxt, FM_FMRI_SW_CTXT_STACK,
            ctxt_stack, ctxt_stackdepth);

    /*
     * Add 'context' to the fmri.
     */
    if (err == 0)
        err |= nvlist_add_nvlist(fmri, FM_FMRI_SW_CTXT, ctxt);

    moderr = err ? EMOD_NOMEM : 0;
out:
    if (moderr == 0)
        *out = fmri;
    else
        nvlist_free(fmri);

    nvlist_free(obj);
    nvlist_free(site);
    nvlist_free(ctxt);

    return (moderr == 0 ? 0 : topo_mod_seterrno(mod, moderr));
}


/*ARGSUSED*/
static int
sw_enum(topo_mod_t *mod, tnode_t *pnode, const char *name,
    topo_instance_t min, topo_instance_t max, void *notused1, void *notused2)
{
    (void) topo_method_register(mod, pnode, sw_methods);
    return (0);
}

static void
sw_release(topo_mod_t *mod, tnode_t *node)
{
    topo_method_unregister_all(mod, node);
}

/*
 * Lookup a string in an nvlist.  Possible return values:
 *  if 'required' is B_TRUE:
 *      1 = found
 *      0 = not found
 *  if 'required' is B_FALSE:
 *      1 = found
 *      0 = not found, but some error other than ENOENT encountered
 *      -1 = not found, with ENOENT
 *
 *  So 0 is an error condition in both cases.
 *
 *  In all "not found" cases, *valp is NULLed.
 */
static int
lookup_string(nvlist_t *nvl, char *name, char **valp, boolean_t required)
{
    int err;

    err = nvlist_lookup_string(nvl, name, valp);

    /*
     * A return value of 1 always means "found"
     */
    if (err == 0)
        return (1);

    /*
     * Failure to lookup for whatever reason NULLs valp
     */
    *valp = NULL;

    /*
     * Return 0 if not found but required, or optional but some error
     * other than ENOENT was returned.
     */
    if (required == B_TRUE || err != ENOENT)
        return (0);

    /*
     * Return -1 if not found but was optional (and got ENOENT).
     */
    return (-1);
}

/*ARGSUSED*/
static int
sw_fmri_nvl2str(topo_mod_t *mod, tnode_t *node, topo_version_t version,
    nvlist_t *nvl, nvlist_t **out)
{
    nvlist_t *object, *site = NULL, *anvl = NULL;
    char *file, *func, *token;
    uint8_t scheme_version;
    char *path, *root;
    nvlist_t *fmristr;
    size_t buflen = 0;
    int linevalid = 0;
    char *buf = NULL;
    ssize_t size = 0;
    char linebuf[32];
    int64_t line;
    int pass;
    int err;

    if (version > TOPO_METH_NVL2STR_VERSION)
        return (topo_mod_seterrno(mod, EMOD_VER_NEW));

    if (nvlist_lookup_uint8(nvl, FM_VERSION, &scheme_version) != 0 ||
        scheme_version > FM_SW_SCHEME_VERSION)
        return (topo_mod_seterrno(mod, EMOD_FMRI_NVL));

    /* Get authority, if present */
    err = nvlist_lookup_nvlist(nvl, FM_FMRI_AUTHORITY, &anvl);
    if (err != 0 && err != ENOENT)
        return (topo_mod_seterrno(mod, EMOD_FMRI_NVL));

    /*
     * The 'object' nvlist is required. It must include the path,
     * but the root is optional.
     */
    if (nvlist_lookup_nvlist(nvl, FM_FMRI_SW_OBJ, &object) != 0 ||
        !lookup_string(object, FM_FMRI_SW_OBJ_PATH, &path, B_TRUE) ||
        !lookup_string(object, FM_FMRI_SW_OBJ_ROOT, &root, B_FALSE))
        return (topo_mod_seterrno(mod, EMOD_FMRI_NVL));

    /* The 'site' nvlist is optional */
    file = func = token = NULL;
    linevalid = 0;
    if ((err = nvlist_lookup_nvlist(nvl, FM_FMRI_SW_SITE, &site)) == 0) {
        /*
         * Prefer 'token' to file/func/line
         */
        if (lookup_string(site, FM_FMRI_SW_SITE_TOKEN, &token,
            B_FALSE) <= 0) {
            /*
             * If no token then try file, func, line - but
             * func and line are meaningless without file.
             */
            if (lookup_string(site, FM_FMRI_SW_SITE_FILE,
                &file, B_FALSE) == 1) {
                (void) lookup_string(site, FM_FMRI_SW_SITE_FUNC,
                    &func, B_FALSE);
                if (nvlist_lookup_int64(site,
                    FM_FMRI_SW_SITE_LINE, &line) == 0)
                    linevalid = 1;
            }
        }
    } else if (err != ENOENT) {
        return (topo_mod_seterrno(mod, EMOD_FMRI_NVL));
    }

    /* On the first pass buf is NULL and size and buflen are 0 */
    pass = 1;
again:
    /*
     * sw://[<authority>]/
     *  [:root=<object.root]
     *  :path=<object.path>
     *  [#<fragment-identifier>]
     *
     *  <fragment-identifier> is one of
     *
     *      :token=<site.token>
     *  or
     *      :file=<site.file>[:func=<site.func>][:line=<site.line>]
     */

    /* sw:// */
    topo_fmristr_build(&size, buf, buflen, FM_FMRI_SCHEME_SW,
        NULL, "://");

    /* authority, if any */
    if (anvl != NULL) {
        nvpair_t *apair;
        char *aname, *aval;

        for (apair = nvlist_next_nvpair(anvl, NULL);
            apair != NULL; apair = nvlist_next_nvpair(anvl, apair)) {
            if (nvpair_type(apair) != DATA_TYPE_STRING ||
                nvpair_value_string(apair, &aval) != 0)
                continue;
            aname = nvpair_name(apair);
            topo_fmristr_build(&size, buf, buflen, ":", NULL, NULL);
            topo_fmristr_build(&size, buf, buflen, "=",
                aname, aval);
        }
    }

    /* separating slash */
    topo_fmristr_build(&size, buf, buflen, "/", NULL, NULL);

    /* :root=... */
    if (root) {
        topo_fmristr_build(&size, buf, buflen, root,
            ":" FM_FMRI_SW_OBJ_ROOT "=", NULL);
    }

    /* :path=... */
    topo_fmristr_build(&size, buf, buflen, path,
        ":" FM_FMRI_SW_OBJ_PATH "=", NULL);

    if (token) {
        /* #:token=... */
        topo_fmristr_build(&size, buf, buflen, token,
            "#:" FM_FMRI_SW_SITE_TOKEN "=", NULL);
    } else if (file) {
        /* #:file=... */
        topo_fmristr_build(&size, buf, buflen, file,
            "#:" FM_FMRI_SW_SITE_FILE "=", NULL);

        /* :func=... */
        if (func) {
            topo_fmristr_build(&size, buf, buflen, func,
                ":" FM_FMRI_SW_SITE_FUNC "=", NULL);
        }

        /* :line=... */
        if (linevalid) {
            if (pass == 1)
                (void) snprintf(linebuf, sizeof (linebuf),
                    "%lld", line);

            topo_fmristr_build(&size, buf, buflen, linebuf,
                ":" FM_FMRI_SW_SITE_LINE "=", NULL);
        }
    }

    if (buf == NULL) {
        if ((buf = topo_mod_alloc(mod, size + 1)) == NULL)
            return (topo_mod_seterrno(mod, EMOD_NOMEM));

        buflen = size + 1;
        size = 0;
        pass = 2;
        goto again;
    }

    /*
     * Construct the nvlist to return as the result.
     */
    if (topo_mod_nvalloc(mod, &fmristr, NV_UNIQUE_NAME) != 0) {
        topo_mod_strfree(mod, buf);
        return (topo_mod_seterrno(mod, EMOD_NOMEM));
    }

    if (nvlist_add_string(fmristr, "fmri-string", buf) != 0) {
        topo_mod_strfree(mod, buf);
        nvlist_free(fmristr);
        return (topo_mod_seterrno(mod, EMOD_NOMEM));
    }
    topo_mod_strfree(mod, buf);
    *out = fmristr;

    return (0);
}