ClabureDB: Classified Bug-Reports Database

  /* 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 const 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 const 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 = proc_create("keys", 0, NULL, &proc_keys_fops);
         if (!p)
                 panic("Cannot create /proc/keys\n");
 #endif
 
         p = proc_create("key-users", 0, NULL, &proc_key_users_fops);
         if (!p)
                 panic("Cannot create /proc/key-users\n");
 
         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);
        unsigned maxkeys = (user->uid == 0) ?
                key_quota_root_maxkeys : key_quota_maxkeys;
        unsigned maxbytes = (user->uid == 0) ?
                key_quota_root_maxbytes : key_quota_maxbytes;

        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,
                   maxkeys,
                   user->qnbytes,
                   maxbytes);

        return 0;

}