sendmail/libsm/niprop.c

/*
 * Copyright (c) 2001 Sendmail, Inc. and its suppliers.
 *  All rights reserved.
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the sendmail distribution.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sm/gen.h>
SM_RCSID("@(#)$Id: niprop.c,v 1.6 2001/09/04 22:41:27 ca Exp $")

#if NETINFO
#include <ctype.h>
#include <stdlib.h>
#include <sm/io.h>
#include <sm/assert.h>
#include <sm/debug.h>
#include <sm/string.h>
#include <sm/varargs.h>
#include <sm/heap.h>

/*
**  NI_PROPVAL -- NetInfo property value lookup routine
**
**  Parameters:
**      keydir -- the NetInfo directory name in which to search
**          for the key.
**      keyprop -- the name of the property in which to find the
**          property we are interested.  Defaults to "name".
**      keyval -- the value for which we are really searching.
**      valprop -- the property name for the value in which we
**          are interested.
**      sepchar -- if non-nil, this can be multiple-valued, and
**          we should return a string separated by this
**          character.
**
**  Returns:
**      NULL -- if:
**          1. the directory is not found
**          2. the property name is not found
**          3. the property contains multiple values
**          4. some error occurred
**      else -- the value of the lookup.
**
**  Example:
**      To search for an alias value, use:
**        ni_propval("/aliases", "name", aliasname, "members", ',')
**
**  Notes:
**      Caller should free the return value of ni_proval
*/

# include <netinfo/ni.h>

# define LOCAL_NETINFO_DOMAIN   "."
# define PARENT_NETINFO_DOMAIN  ".."
# define MAX_NI_LEVELS      256

char *
ni_propval(keydir, keyprop, keyval, valprop, sepchar)
    char *keydir;
    char *keyprop;
    char *keyval;
    char *valprop;
    int sepchar;
{
    char *propval = NULL;
    int i;
    int j, alen, l;
    void *ni = NULL;
    void *lastni = NULL;
    ni_status nis;
    ni_id nid;
    ni_namelist ninl;
    register char *p;
    char keybuf[1024];

    /*
    **  Create the full key from the two parts.
    **
    **  Note that directory can end with, e.g., "name=" to specify
    **  an alternate search property.
    */

    i = strlen(keydir) + strlen(keyval) + 2;
    if (keyprop != NULL)
        i += strlen(keyprop) + 1;
    if (i >= sizeof keybuf)
        return NULL;
    (void) sm_strlcpyn(keybuf, sizeof keybuf, 2, keydir, "/");
    if (keyprop != NULL)
    {
        (void) sm_strlcat2(keybuf, keyprop, "=", sizeof keybuf);
    }
    (void) sm_strlcat(keybuf, keyval, sizeof keybuf);

#if 0
    if (tTd(38, 21))
        sm_dprintf("ni_propval(%s, %s, %s, %s, %d) keybuf='%s'\n",
            keydir, keyprop, keyval, valprop, sepchar, keybuf);
#endif /* 0 */

    /*
    **  If the passed directory and property name are found
    **  in one of netinfo domains we need to search (starting
    **  from the local domain moving all the way back to the
    **  root domain) set propval to the property's value
    **  and return it.
    */

    for (i = 0; i < MAX_NI_LEVELS && propval == NULL; i++)
    {
        if (i == 0)
        {
            nis = ni_open(NULL, LOCAL_NETINFO_DOMAIN, &ni);
#if 0
            if (tTd(38, 20))
                sm_dprintf("ni_open(LOCAL) = %d\n", nis);
#endif /* 0 */
        }
        else
        {
            if (lastni != NULL)
                ni_free(lastni);
            lastni = ni;
            nis = ni_open(lastni, PARENT_NETINFO_DOMAIN, &ni);
#if 0
            if (tTd(38, 20))
                sm_dprintf("ni_open(PARENT) = %d\n", nis);
#endif /* 0 */
        }

        /*
        **  Don't bother if we didn't get a handle on a
        **  proper domain.  This is not necessarily an error.
        **  We would get a positive ni_status if, for instance
        **  we never found the directory or property and tried
        **  to open the parent of the root domain!
        */

        if (nis != 0)
            break;

        /*
        **  Find the path to the server information.
        */

        if (ni_pathsearch(ni, &nid, keybuf) != 0)
            continue;

        /*
        **  Find associated value information.
        */

        if (ni_lookupprop(ni, &nid, valprop, &ninl) != 0)
            continue;

#if 0
        if (tTd(38, 20))
            sm_dprintf("ni_lookupprop: len=%d\n",
                ninl.ni_namelist_len);
#endif /* 0 */

        /*
        **  See if we have an acceptable number of values.
        */

        if (ninl.ni_namelist_len <= 0)
            continue;

        if (sepchar == '\0' && ninl.ni_namelist_len > 1)
        {
            ni_namelist_free(&ninl);
            continue;
        }

        /*
        **  Calculate number of bytes needed and build result
        */

        alen = 1;
        for (j = 0; j < ninl.ni_namelist_len; j++)
            alen += strlen(ninl.ni_namelist_val[j]) + 1;
        propval = p = sm_malloc(alen);
        if (propval == NULL)
            goto cleanup;
        for (j = 0; j < ninl.ni_namelist_len; j++)
        {
            (void) sm_strlcpy(p, ninl.ni_namelist_val[j], alen);
            l = strlen(p);
            p += l;
            *p++ = sepchar;
            alen -= l + 1;
        }
        *--p = '\0';

        ni_namelist_free(&ninl);
    }

  cleanup:
    if (ni != NULL)
        ni_free(ni);
    if (lastni != NULL && ni != lastni)
        ni_free(lastni);
#if 0
    if (tTd(38, 20))
        sm_dprintf("ni_propval returns: '%s'\n", propval);
#endif /* 0 */

    return propval;
}
#endif /* NETINFO */