/*      $NetBSD: pam_std_option.c,v 1.2 2004/12/12 08:18:43 christos Exp $      */

/*-
 * Copyright 1998 Juniper Networks, Inc.
 * 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. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 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.
 */

#include <sys/cdefs.h>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD: src/lib/libpam/libpam/pam_std_option.c,v 1.10 2002/04/14 18:30:03 des Exp $");
#else
__RCSID("$NetBSD: pam_std_option.c,v 1.2 2004/12/12 08:18:43 christos Exp $");
#endif

#include <stdio.h>
#include <string.h>
#include <syslog.h>

#include <security/pam_appl.h>
#include <security/pam_mod_misc.h>

/* Everyone has to have these options. It is not an error to
 * specify them and then not use them.
 */
struct opttab std_options[PAM_MAX_OPTIONS] = {
        { "debug",              PAM_OPT_DEBUG },
        { "no_warn",            PAM_OPT_NO_WARN },
        { "echo_pass",          PAM_OPT_ECHO_PASS },
        { "use_first_pass",     PAM_OPT_USE_FIRST_PASS },
        { "try_first_pass",     PAM_OPT_TRY_FIRST_PASS },
        { "use_mapped_pass",    PAM_OPT_USE_MAPPED_PASS },
        { "try_mapped_pass",    PAM_OPT_TRY_MAPPED_PASS },
        { "expose_account",     PAM_OPT_EXPOSE_ACCOUNT },
        { NULL,                 0 }
};

/* Populate the options structure, syslogging all errors */
void
pam_std_option(struct options *options, struct opttab other_options[],
    int argc, const char *argv[])
{
        struct opttab *oo;
        int i, j, std, extra, arglen, found;

        std = 1;
        extra = 1;
        oo = other_options;
        for (i = 0; i < PAM_MAX_OPTIONS; i++) {
                if (std && std_options[i].name == NULL)
                        std = 0;
                else if (extra && (oo == NULL || oo->name == NULL))
                        extra = 0;

                if (std)
                        options->opt[i].name = std_options[i].name;
                else if (extra) {
                        if (oo->value != i)
                                syslog(LOG_DEBUG, "Extra option fault: %d %d",
                                    oo->value, i);
                        options->opt[i].name = oo->name;
                        oo++;
                }
                else
                        options->opt[i].name = NULL;

                options->opt[i].bool = 0;
                options->opt[i].arg = NULL;
        }

        for (j = 0; j < argc; j++) {
#ifdef DEBUG
                syslog(LOG_DEBUG, "Doing arg %s", argv[j]);
#endif
                found = 0;
                for (i = 0; i < PAM_MAX_OPTIONS; i++) {
                        if (options->opt[i].name == NULL)
                                break;
                        arglen = strlen(options->opt[i].name);
                        if (strcmp(argv[j], options->opt[i].name) == 0) {
                                options->opt[i].bool = 1;
                                found = 1;
                                break;
                        }
                        else if (strncmp(argv[j], options->opt[i].name, arglen)
                            == 0 && argv[j][arglen] == '=')  {
                                options->opt[i].bool = 1;
                                options->opt[i].arg
                                    = strdup(&argv[j][arglen + 1]);
                                found = 1;
                                break;
                        }
                }
                if (!found)
                        syslog(LOG_WARNING, "PAM option: %s invalid", argv[j]);
        }
}

/* Test if option is set in options */
int
pam_test_option(struct options *options, enum opt option, char **arg)
{
        if (arg != NULL)
                *arg = options->opt[option].arg;
        return options->opt[option].bool;
}

/* Set option in options, errors to syslog */
void
pam_set_option(struct options *options, enum opt option)
{
        if (option < PAM_OPT_STD_MAX)
                options->opt[option].bool = 1;
#ifdef DEBUG
        else
                syslog(LOG_DEBUG, "PAM options: attempt to set option %d",
                    option);
#endif
}

/* Clear option in options, errors to syslog */
void
pam_clear_option(struct options *options, enum opt option)
{
        if (option < PAM_OPT_STD_MAX)
                options->opt[option].bool = 0;
#ifdef DEBUG
        else
                syslog(LOG_DEBUG, "PAM options: attempt to clear option %d",
                    option);
#endif
}

#ifdef DEBUG1
enum { PAM_OPT_FOO=PAM_OPT_STD_MAX, PAM_OPT_BAR, PAM_OPT_BAZ, PAM_OPT_QUX };

struct opttab other_options[] = {
        { "foo", PAM_OPT_FOO },
        { "bar", PAM_OPT_BAR },
        { "baz", PAM_OPT_BAZ },
        { "qux", PAM_OPT_QUX },
        { NULL, 0 }
};

int
main(int argc, const char *argv[])
{
        struct options options;
        int i, opt;
        char *arg;

        pam_std_option(&options, other_options, argc, argv);
        for (i = 0; i < PAM_MAX_OPTIONS; i++) {
                opt = pam_test_option(&options, i, &arg);
                if (opt) {
                        if (arg == NULL)
                                printf("%d []\n", i);
                        else
                                printf("%d [%s]\n", i, arg);
                }
        }
        return 0;
}
#endif