/*
 * 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) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <nss_dbdefs.h>
#include <deflt.h>
#include <exec_attr.h>
#include <user_attr.h>
#include <auth_attr.h>
#include <prof_attr.h>
#include <getxby_door.h>
#include <sys/mman.h>


/* Externs from libnsl */
extern execstr_t *_getexecattr(execstr_t *, char *, int, int *);
extern void _setexecattr(void);
extern void _endexecattr(void);
extern execstr_t *_getexecprof(const char *, const char *, const char *, int,
    execstr_t *, char *, int, int *);
extern userstr_t *_getusernam(const char *, userstr_t *, char *, int, int *);
extern userstr_t *_getuserattr(userstr_t *, char *, int, int *);
extern char *_strtok_escape(char *, char *, char **);
extern char *_strdup_null(char *);

static execattr_t *userprof(const char *, const char *, const char *, int);
static execattr_t *get_tail(execattr_t *);
static execattr_t *execstr2attr(execstr_t *);

execattr_t *
getexecattr()
{
        int             err = 0;
        char            buf[NSS_BUFLEN_EXECATTR];
        execstr_t       exec;
        execstr_t       *tmp;

        tmp = _getexecattr(&exec, buf, NSS_BUFLEN_EXECATTR, &err);

        return (execstr2attr(tmp));
}


execattr_t *
getexecprof(const char *name, const char *type, const char *id, int search_flag)
{
        int             err = 0;
        char            unique[NSS_BUFLEN_EXECATTR];
        char            buf[NSS_BUFLEN_EXECATTR];
        execattr_t      *head = NULL;
        execattr_t      *prev = NULL;
        execstr_t       exec;
        execstr_t       *tmp;

        (void) memset(unique, 0, NSS_BUFLEN_EXECATTR);
        (void) memset(&exec, 0, sizeof (execstr_t));

        if (!IS_GET_ONE(search_flag) && !IS_GET_ALL(search_flag)) {
                return (NULL);
        }

        if ((name == NULL) && (type == NULL) && (id == NULL)) {
                setexecattr();
                if (IS_GET_ONE(search_flag)) {
                        head = getexecattr();
                } else if (IS_GET_ALL(search_flag)) {
                        head = getexecattr();
                        prev = head;
                        while (prev != NULL) {
                                prev->next = getexecattr();
                                prev = prev->next;
                        };
                } else {
                        head = NULL;
                }
                endexecattr();
                return (head);
        }

        tmp = _getexecprof(name,
            type,
            id,
            search_flag,
            &exec,
            buf,
            NSS_BUFLEN_EXECATTR,
            &err);

        return (execstr2attr(tmp));
}

execattr_t *
getexecuser(const char *username, const char *type, const char *id,
    int search_flag)
{
        int             err = 0;
        char            buf[NSS_BUFLEN_USERATTR];
        userstr_t       user;
        userstr_t       *utmp;
        execattr_t      *head = NULL;
        execattr_t      *prev =  NULL;
        execattr_t      *new = NULL;

        if (!IS_GET_ONE(search_flag) && !IS_GET_ALL(search_flag)) {
                return (NULL);
        }

        if (username == NULL) {
                setuserattr();
                /* avoid userstr2attr mallocs by calling libnsl directly */
                utmp = _getuserattr(&user, buf, NSS_BUFLEN_USERATTR, &err);
                if (utmp == NULL) {
                        return (head);
                }
                if (IS_GET_ONE(search_flag)) {
                        head = userprof((const char *)(utmp->name), type, id,
                            search_flag);
                } else if (IS_GET_ALL(search_flag)) {
                        head = userprof((const char *)(utmp->name), type, id,
                            search_flag);
                        if (head != NULL) {
                                prev = get_tail(head);
                        }
                        while ((utmp = _getuserattr(&user,
                            buf, NSS_BUFLEN_USERATTR, &err)) != NULL) {
                                if ((new =
                                    userprof((const char *)(utmp->name),
                                    type, id, search_flag)) != NULL) {
                                        if (prev != NULL) {
                                                prev->next = new;
                                                prev = get_tail(prev->next);
                                        } else {
                                                head = new;
                                                prev = get_tail(head);
                                        }
                                }
                        }
                } else {
                        head = NULL;
                }
                enduserattr();
        } else {
                head = userprof(username, type, id, search_flag);
        }

        return (head);
}


execattr_t *
match_execattr(execattr_t *exec, const char *profname, const char *type,
    const char *id)
{
        execattr_t      *execp = NULL;

        for (execp = exec; execp != NULL; execp = execp->next) {
                if ((profname && execp->name &&
                    (strcmp(profname, execp->name) != 0)) ||
                    (type && execp->type && (strcmp(type, execp->type) != 0)) ||
                    (id && execp->id && (strcmp(id, execp->id) != 0)))
                        continue;
        }

        return (execp);
}


void
setexecattr()
{
        _setexecattr();
}


void
endexecattr()
{
        _endexecattr();
}


void
free_execattr(execattr_t *exec)
{
        if (exec != NULL) {
                free(exec->name);
                free(exec->type);
                free(exec->policy);
                free(exec->res1);
                free(exec->res2);
                free(exec->id);
                _kva_free(exec->attr);
                free_execattr(exec->next);
                free(exec);
        }
}

typedef struct call {
        const char      *type;
        const char      *id;
        int             sflag;
} call;

typedef struct result {
        execattr_t *head;
        execattr_t *prev;
} result;

/*ARGSUSED*/
static int
findexecattr(const char *prof, kva_t *kva, void *ctxt, void *res)
{
        execattr_t *exec;
        call *c = ctxt;
        result *r = res;

        if ((exec = getexecprof(prof, c->type, c->id, c->sflag)) != NULL) {
                if (IS_GET_ONE(c->sflag)) {
                        r->head = exec;
                        return (1);
                } else if (IS_GET_ALL(c->sflag)) {
                        if (r->head == NULL) {
                                r->head = exec;
                                r->prev = get_tail(r->head);
                        } else {
                                r->prev->next = exec;
                                r->prev = get_tail(exec);
                        }
                }
        }
        return (0);
}


static execattr_t *
userprof(const char *username, const char *type, const char *id,
    int search_flag)
{

        char            pwdb[NSS_BUFLEN_PASSWD];
        struct passwd   pwd;
        call            call;
        result          result;

        /*
         * Check if specified username is valid user
         */
        if (getpwnam_r(username, &pwd, pwdb, sizeof (pwdb)) == NULL) {
                return (NULL);
        }

        result.head = result.prev = NULL;
        call.type = type;
        call.id = id;
        call.sflag = search_flag;

        (void) _enum_profs(username, findexecattr, &call, &result);

        return (result.head);
}


static execattr_t *
get_tail(execattr_t *exec)
{
        execattr_t *i_exec = NULL;
        execattr_t *j_exec = NULL;

        if (exec != NULL) {
                if (exec->next == NULL) {
                        j_exec = exec;
                } else {
                        for (i_exec = exec->next; i_exec != NULL;
                            i_exec = i_exec->next) {
                                j_exec = i_exec;
                        }
                }
        }

        return (j_exec);
}


static execattr_t *
execstr2attr(execstr_t *es)
{
        execattr_t      *newexec;

        if (es == NULL) {
                return (NULL);
        }
        if ((newexec = malloc(sizeof (execattr_t))) == NULL) {
                return (NULL);
        }

        newexec->name = _do_unescape(es->name);
        newexec->policy = _do_unescape(es->policy);
        newexec->type = _do_unescape(es->type);
        newexec->res1 =  _do_unescape(es->res1);
        newexec->res2 = _do_unescape(es->res2);
        newexec->id = _do_unescape(es->id);
        newexec->attr = _str2kva(es->attr, KV_ASSIGN, KV_DELIMITER);
        if (es->next) {
                newexec->next = execstr2attr((execstr_t *)(es->next));
        } else {
                newexec->next = NULL;
        }
        return (newexec);
}

#ifdef DEBUG
void
print_execattr(execattr_t *exec)
{
        extern void print_kva(kva_t *);
        char *empty = "empty";

        if (exec != NULL) {
                printf("name=%s\n", exec->name ? exec->name : empty);
                printf("policy=%s\n", exec->policy ? exec->policy : empty);
                printf("type=%s\n", exec->type ? exec->type : empty);
                printf("res1=%s\n", exec->res1 ? exec->res1 : empty);
                printf("res2=%s\n", exec->res2 ? exec->res2 : empty);
                printf("id=%s\n", exec->id ? exec->id : empty);
                printf("attr=\n");
                print_kva(exec->attr);
                fflush(stdout);
                if (exec->next) {
                        print_execattr(exec->next);
                }
        } else {
                printf("NULL\n");
        }
}
#endif  /* DEBUG */