/*
 * charybdis: an advanced ircd.
 * privilege.c: Dynamic privileges API.
 *
 * Copyright (c) 2008 William Pitcock <nenolod@dereferenced.org>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice is present in all copies.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 <stdinc.h>
#include "s_conf.h"
#include "privilege.h"
#include "numeric.h"

static rb_dlink_list privilegeset_list = {};

int
privilegeset_in_set(struct PrivilegeSet *set, const char *priv)
{
    s_assert(set != NULL);
    s_assert(priv != NULL);

    return strstr(set->privs, priv) != NULL;
}

static struct PrivilegeSet *
privilegeset_get_any(const char *name)
{
    rb_dlink_node *iter;

    s_assert(name != NULL);

    RB_DLINK_FOREACH(iter, privilegeset_list.head) {
        struct PrivilegeSet *set = (struct PrivilegeSet *) iter->data;

        if (!strcasecmp(set->name, name))
            return set;
    }

    return NULL;
}

struct PrivilegeSet *
privilegeset_set_new(const char *name, const char *privs, PrivilegeFlags flags)
{
    struct PrivilegeSet *set;

    set = privilegeset_get_any(name);
    if (set != NULL) {
        if (!(set->status & CONF_ILLEGAL))
            ilog(L_MAIN, "Duplicate privset %s", name);
        set->status &= ~CONF_ILLEGAL;
        rb_free(set->privs);
    } else {
        set = rb_malloc(sizeof(struct PrivilegeSet));
        set->status = 0;
        set->refs = 0;
        set->name = rb_strdup(name);

        rb_dlinkAdd(set, &set->node, &privilegeset_list);
    }
    set->privs = rb_strdup(privs);
    set->flags = flags;

    return set;
}

struct PrivilegeSet *
privilegeset_extend(struct PrivilegeSet *parent, const char *name, const char *privs, PrivilegeFlags flags)
{
    struct PrivilegeSet *set;

    s_assert(parent != NULL);
    s_assert(name != NULL);
    s_assert(privs != NULL);

    set = privilegeset_get_any(name);
    if (set != NULL) {
        if (!(set->status & CONF_ILLEGAL))
            ilog(L_MAIN, "Duplicate privset %s", name);
        set->status &= ~CONF_ILLEGAL;
        rb_free(set->privs);
    } else {
        set = rb_malloc(sizeof(struct PrivilegeSet));
        set->status = 0;
        set->refs = 0;
        set->name = rb_strdup(name);

        rb_dlinkAdd(set, &set->node, &privilegeset_list);
    }
    set->flags = flags;
    set->privs = rb_malloc(strlen(parent->privs) + 1 + strlen(privs) + 1);
    strcpy(set->privs, parent->privs);
    strcat(set->privs, " ");
    strcat(set->privs, privs);

    return set;
}

struct PrivilegeSet *
privilegeset_get(const char *name)
{
    struct PrivilegeSet *set;

    set = privilegeset_get_any(name);
    if (set != NULL && set->status & CONF_ILLEGAL)
        set = NULL;
    return set;
}

struct PrivilegeSet *
privilegeset_ref(struct PrivilegeSet *set)
{
    s_assert(set != NULL);

    set->refs++;

    return set;
}

void
privilegeset_unref(struct PrivilegeSet *set)
{
    s_assert(set != NULL);

    if (set->refs > 0)
        set->refs--;
    else
        ilog(L_MAIN, "refs on privset %s is already 0",
             set->name);
    if (set->refs == 0 && set->status & CONF_ILLEGAL) {
        rb_dlinkDelete(&set->node, &privilegeset_list);

        rb_free(set->name);
        rb_free(set->privs);
        rb_free(set);
    }
}

void
privilegeset_mark_all_illegal(void)
{
    rb_dlink_node *iter;

    RB_DLINK_FOREACH(iter, privilegeset_list.head) {
        struct PrivilegeSet *set = (struct PrivilegeSet *) iter->data;

        /* the "default" privset is special and must remain available */
        if (!strcmp(set->name, "default"))
            continue;

        set->status |= CONF_ILLEGAL;
        rb_free(set->privs);
        set->privs = rb_strdup("");
        /* but do not free it yet */
    }
}

void
privilegeset_delete_all_illegal(void)
{
    rb_dlink_node *iter, *next;

    RB_DLINK_FOREACH_SAFE(iter, next, privilegeset_list.head) {
        struct PrivilegeSet *set = (struct PrivilegeSet *) iter->data;

        privilegeset_ref(set);
        privilegeset_unref(set);
    }
}

void
privilegeset_report(struct Client *source_p)
{
    rb_dlink_node *ptr;

    RB_DLINK_FOREACH(ptr, privilegeset_list.head) {
        struct PrivilegeSet *set = ptr->data;

        /* use RPL_STATSDEBUG for now -- jilles */
        sendto_one_numeric(source_p, RPL_STATSDEBUG,
                           "O :%s %s",
                           set->name,
                           set->privs);
    }
}
