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/* proc.c: proc files for key database enumeration

 *

 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.

 * Written by David Howells (dhowells@redhat.com)

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */

#include <linux/module.h>

#include <linux/init.h>

#include <linux/sched.h>

#include <linux/slab.h>

#include <linux/fs.h>

#include <linux/proc_fs.h>

#include <linux/seq_file.h>

#include <asm/errno.h>

#include "internal.h"

#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS

static int proc_keys_open(struct inode *inode, struct file *file);

static void *proc_keys_start(struct seq_file *p, loff_t *_pos);

static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos);

static void proc_keys_stop(struct seq_file *p, void *v);

static int proc_keys_show(struct seq_file *m, void *v);

static struct seq_operations proc_keys_ops = {

        .start  = proc_keys_start,

        .next   = proc_keys_next,

        .stop   = proc_keys_stop,

        .show   = proc_keys_show,

};

static const struct file_operations proc_keys_fops = {

        .open           = proc_keys_open,

        .read           = seq_read,

        .llseek         = seq_lseek,

        .release        = seq_release,

};

#endif

static int proc_key_users_open(struct inode *inode, struct file *file);

static void *proc_key_users_start(struct seq_file *p, loff_t *_pos);

static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos);

static void proc_key_users_stop(struct seq_file *p, void *v);

static int proc_key_users_show(struct seq_file *m, void *v);

static struct seq_operations proc_key_users_ops = {

        .start  = proc_key_users_start,

        .next   = proc_key_users_next,

        .stop   = proc_key_users_stop,

        .show   = proc_key_users_show,

};

static const struct file_operations proc_key_users_fops = {

        .open           = proc_key_users_open,

        .read           = seq_read,

        .llseek         = seq_lseek,

        .release        = seq_release,

};

/*****************************************************************************/

/*

 * declare the /proc files

 */

static int __init key_proc_init(void)

{

        struct proc_dir_entry *p;

#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS

        p = create_proc_entry("keys", 0, NULL);

        if (!p)

                panic("Cannot create /proc/keys\n");

        p->proc_fops = &proc_keys_fops;

#endif

        p = create_proc_entry("key-users", 0, NULL);

        if (!p)

                panic("Cannot create /proc/key-users\n");

        p->proc_fops = &proc_key_users_fops;

        return 0;

} /* end key_proc_init() */

__initcall(key_proc_init);

/*****************************************************************************/

/*

 * implement "/proc/keys" to provides a list of the keys on the system

 */

#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS

static int proc_keys_open(struct inode *inode, struct file *file)

{

        return seq_open(file, &proc_keys_ops);

}

static void *proc_keys_start(struct seq_file *p, loff_t *_pos)

{

        struct rb_node *_p;

        loff_t pos = *_pos;

        spin_lock(&key_serial_lock);

        _p = rb_first(&key_serial_tree);

        while (pos > 0 && _p) {

                pos--;

                _p = rb_next(_p);

        }

        return _p;

}

static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)

{

        (*_pos)++;

        return rb_next((struct rb_node *) v);

}

static void proc_keys_stop(struct seq_file *p, void *v)

{

        spin_unlock(&key_serial_lock);

}

static int proc_keys_show(struct seq_file *m, void *v)

{

        struct rb_node *_p = v;

        struct key *key = rb_entry(_p, struct key, serial_node);

        struct timespec now;

        unsigned long timo;

        char xbuf[12];

        int rc;

        /* check whether the current task is allowed to view the key (assuming

         * non-possession) */

        rc = key_task_permission(make_key_ref(key, 0), current, KEY_VIEW);

        if (rc < 0)

                return 0;

        now = current_kernel_time();

        rcu_read_lock();

        /* come up with a suitable timeout value */

        if (key->expiry == 0) {

                memcpy(xbuf, "perm", 5);

        }

        else if (now.tv_sec >= key->expiry) {

                memcpy(xbuf, "expd", 5);

        }

        else {

                timo = key->expiry - now.tv_sec;

                if (timo < 60)

                        sprintf(xbuf, "%lus", timo);

                else if (timo < 60*60)

                        sprintf(xbuf, "%lum", timo / 60);

                else if (timo < 60*60*24)

                        sprintf(xbuf, "%luh", timo / (60*60));

                else if (timo < 60*60*24*7)

                        sprintf(xbuf, "%lud", timo / (60*60*24));

                else

                        sprintf(xbuf, "%luw", timo / (60*60*24*7));

        }

#define showflag(KEY, LETTER, FLAG) \

        (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')

        seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",

                   key->serial,

                   showflag(key, 'I', KEY_FLAG_INSTANTIATED),

                   showflag(key, 'R', KEY_FLAG_REVOKED),

                   showflag(key, 'D', KEY_FLAG_DEAD),

                   showflag(key, 'Q', KEY_FLAG_IN_QUOTA),

                   showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),

                   showflag(key, 'N', KEY_FLAG_NEGATIVE),

                   atomic_read(&key->usage),

                   xbuf,

                   key->perm,

                   key->uid,

                   key->gid,

                   key->type->name);

#undef showflag

        if (key->type->describe)

                key->type->describe(key, m);

        seq_putc(m, '\n');

        rcu_read_unlock();

        return 0;

}

#endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */

/*****************************************************************************/

/*

 * implement "/proc/key-users" to provides a list of the key users

 */

static int proc_key_users_open(struct inode *inode, struct file *file)

{

        return seq_open(file, &proc_key_users_ops);

}

static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)

{

        struct rb_node *_p;

        loff_t pos = *_pos;

        spin_lock(&key_user_lock);

        _p = rb_first(&key_user_tree);

        while (pos > 0 && _p) {

                pos--;

                _p = rb_next(_p);

        }

        return _p;

}

static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)

{

        (*_pos)++;

        return rb_next((struct rb_node *) v);

}

static void proc_key_users_stop(struct seq_file *p, void *v)

{

        spin_unlock(&key_user_lock);

}

static int proc_key_users_show(struct seq_file *m, void *v)

{

        struct rb_node *_p = v;

        struct key_user *user = rb_entry(_p, struct key_user, node);

        seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",

                   user->uid,

                   atomic_read(&user->usage),

                   atomic_read(&user->nkeys),

                   atomic_read(&user->nikeys),

                   user->qnkeys,

                   KEYQUOTA_MAX_KEYS,

                   user->qnbytes,

                   KEYQUOTA_MAX_BYTES

                   );

        return 0;

}