/*
 *  m_mkpasswd.c: Encrypts a password online, DES or MD5.
 *
 *  Copyright 2002 W. Campbell and the ircd-hybrid development team
 *  Based on mkpasswd.c, originally by Nelson Minar (minar@reed.edu)
 *
 *  You can use this code in any way as long as these names remain.
 *
 *  $Id: m_mkpasswd.c,v 1.2 2003/08/14 07:51:07 stu Exp $
 */

/* List of ircd includes from ../include/ */
#include "stdinc.h"
#include "handlers.h"
#include "client.h"
#include "common.h"     /* FALSE bleah */
#include "ircd.h"
#include "irc_string.h"
#include "numeric.h"
#include "fdlist.h"
#include "s_bsd.h"
#include "s_conf.h"
#include "s_log.h"
#include "s_serv.h"
#include "send.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"

static void m_mkpasswd(struct Client *client_p, struct Client *source_p,
                       int parc, char *parv[]);
static void mo_mkpasswd(struct Client *client_p, struct Client *source_p,
                        int parc, char *parv[]);
static char *make_salt(void);
static char *make_md5_salt(void);

static char saltChars[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789./";

struct Message mkpasswd_msgtab = {
  "MKPASSWD", 0, 0, 1, 2, MFLG_SLOW, 0,
  {m_unregistered, m_mkpasswd, m_ignore, mo_mkpasswd, m_ignore}
};

#ifndef STATIC_MODULES
void _modinit(void)
{
  mod_add_cmd(&mkpasswd_msgtab);
}

void _moddeinit(void)
{
  mod_del_cmd(&mkpasswd_msgtab);
}

const char *_version = "$Revision: 1.2 $";
#endif

static void
m_mkpasswd(struct Client *client_p, struct Client *source_p,
           int parc, char *parv[])
{
  static time_t last_used = 0;
  int is_md5 = 0;

  if ((last_used + ConfigFileEntry.pace_wait) > CurrentTime)
  {
    /* safe enough to give this on a local connect only */
    sendto_one(source_p, form_str(RPL_LOAD2HI),
               me.name, source_p->name);
    return;
  }
  else
    last_used = CurrentTime;

  if (parc == 3)
  {
    if (irccmp(parv[2], "MD5") == 0)
    {
      is_md5 = 1;
    }
    else if (irccmp(parv[2], "DES") == 0)
    {
      /* Not really needed, but we may want to have a default encryption
       * setting somewhere down the road
       */
      is_md5 = 0;
    }
    else
    {
      sendto_one(source_p, ":%s NOTICE %s :MKPASSWD syntax error:  MKPASSWD pass [DES|MD5]", me.name, parv[0]);
      return;
    }
  }

  if (parc == 1)
    sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
               me.name, parv[0], "MKPASSWD");
  else
    sendto_one(source_p, ":%s NOTICE %s :Encryption for [%s]:  %s",
               me.name, parv[0], parv[1], crypt(parv[1],
               is_md5 ? make_md5_salt() : make_salt()));
}

/*
** mo_mkpasswd
**      parv[0] = sender prefix
**      parv[1] = parameter
*/
static void
mo_mkpasswd(struct Client *client_p, struct Client *source_p,
	    int parc, char *parv[])
{		 
  int is_md5 = 0;

  if (parc == 3)
  {
    if (irccmp(parv[2], "MD5") == 0)
    {
      is_md5 = 1;
    }
    else if (irccmp(parv[2], "DES") == 0)
    {
      /* Not really needed, but we may want to have a default encryption
       * setting somewhere down the road
       */
      is_md5 = 0;
    }
    else
    {
      sendto_one(source_p, ":%s NOTICE %s :MKPASSWD syntax error:  MKPASSWD pass [DES|MD5]", me.name, parv[0]);
      return;
    }
  }

  if (parc == 1)
    sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
               me.name, parv[0], "MKPASSWD");
  else
    sendto_one(source_p, ":%s NOTICE %s :Encryption for [%s]:  %s",
               me.name, parv[0], parv[1], crypt(parv[1],
               is_md5 ? make_md5_salt() : make_salt()));
}

static char *
make_salt(void)
{
  static char salt[3];

  salt[0] = saltChars[random() % 64];
  salt[1] = saltChars[random() % 64];
  salt[2] = '\0';
  return(salt);
}

static char *
make_md5_salt(void)
{
  static char salt[13];
  int i;

  salt[0] = '$';
  salt[1] = '1';
  salt[2] = '$';

  for (i=3; i<11; i++)
    salt[i] = saltChars[random() % 64];

  salt[11] = '$';
  salt[12] = '\0';
  return(salt);
}
