/*
 * IRC - Internet Relay Chat, ircd/m_pass.c
 * Copyright (C) 1990 Jarkko Oikarinen and
 *                    University of Oulu, Computing Center
 *
 * See file AUTHORS in IRC package for additional names of
 * the programmers.
 *
 * 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 1, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id: m_pass.c 1668 2006-06-17 13:09:14Z entrope $
 */

/*
 * m_functions execute protocol messages on this server:
 *
 *    cptr    is always NON-NULL, pointing to a *LOCAL* client
 *            structure (with an open socket connected!). This
 *            identifies the physical socket where the message
 *            originated (or which caused the m_function to be
 *            executed--some m_functions may call others...).
 *
 *    sptr    is the source of the message, defined by the
 *            prefix part of the message if present. If not
 *            or prefix not found, then sptr==cptr.
 *
 *            (!IsServer(cptr)) => (cptr == sptr), because
 *            prefixes are taken *only* from servers...
 *
 *            (IsServer(cptr))
 *                    (sptr == cptr) => the message didn't
 *                    have the prefix.
 *
 *                    (sptr != cptr && IsServer(sptr) means
 *                    the prefix specified servername. (?)
 *
 *                    (sptr != cptr && !IsServer(sptr) means
 *                    that message originated from a remote
 *                    user (not local).
 *
 *            combining
 *
 *            (!IsServer(sptr)) means that, sptr can safely
 *            taken as defining the target structure of the
 *            message in this server.
 *
 *    *Always* true (if 'parse' and others are working correct):
 *
 *    1)      sptr->from == cptr  (note: cptr->from == cptr)
 *
 *    2)      MyConnect(sptr) <=> sptr == cptr (e.g. sptr
 *            *cannot* be a local connection, unless it's
 *            actually cptr!). [MyConnect(x) should probably
 *            be defined as (x == x->from) --msa ]
 *
 *    parc    number of variable parameter strings (if zero,
 *            parv is allowed to be NULL)
 *
 *    parv    a NULL terminated list of parameter pointers,
 *
 *                    parv[0], sender (prefix string), if not present
 *                            this points to an empty string.
 *                    parv[1]...parv[parc-1]
 *                            pointers to additional parameters
 *                    parv[parc] == NULL, *always*
 *
 *            note:   it is guaranteed that parv[0]..parv[parc-1] are all
 *                    non-NULL pointers.
 */
#include "config.h"

#include "client.h"
#include "ircd_features.h"
#include "ircd_log.h"
#include "ircd_alloc.h"
#include "ircd_reply.h"
#include "ircd_string.h"
#include "s_auth.h"
#include "s_user.h"
#include "send.h"
#include "struct.h"

#include <string.h>

/* #include <assert.h> -- Now using assert in ircd_log.h */

/*
 * mr_pass - registration message handler
 */
int mr_pass(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
  char password[BUFSIZE];
  int arg, len, i = 0, emptypass = 0;
  char* locargv[3] = {NULL, NULL, NULL};
  char *tmp = NULL;

  assert(0 != cptr);
  assert(cptr == sptr);
  assert(!IsRegistered(sptr));

  /* Some clients (brokenly) send "PASS x y" rather than "PASS :x y"
   * when the user enters "x y" as the password.  Unsplit arguments to
   * work around this.
   */
  for (arg = 1, len = 0; arg < parc; ++arg)
  {
    ircd_strncpy(password + len, parv[arg], sizeof(password) - len);
    len += strlen(parv[arg]);
    password[len++] = ' ';
  }
  if (len > 0)
    --len;
  password[len] = '\0';

  if (feature_bool(FEAT_LOGIN_ON_CONNECT) &&
      feature_bool(FEAT_EXTENDED_ACCOUNTS) &&
      !cli_loc(cptr) && (password[0] != '\0')) {
    emptypass = 1;
    tmp = password;
    if (*tmp == '/') {
      *tmp = '\0';
      tmp++;
    } else {
      tmp = strstr(tmp, " /");
      if (tmp != NULL) {
        *tmp = '\0';
        tmp += 2;
      }
    }

    while ((tmp != NULL) && *tmp && (i<3)) {
      locargv[i++] = tmp;
      tmp = strstr(tmp, "/");
      if (tmp != NULL) {
        *tmp = '\0';
        tmp++;
      }
    }

    if ((i>1) && !EmptyString(locargv[i-2]) && !EmptyString(locargv[i-1])) {
      cli_loc(cptr) = (struct LOCInfo *)MyMalloc(sizeof(struct LOCInfo));
      memset(cli_loc(cptr), 0, sizeof(struct LOCInfo));

      cli_loc(cptr)->cookie = 0;

      ircd_strncpy(cli_loc(cptr)->password, locargv[--i], ACCPASSWDLEN + 1);
      ircd_strncpy(cli_loc(cptr)->account, locargv[--i], ACCOUNTLEN + 1);

      if ((i>0) && !EmptyString(locargv[i-1]))
        ircd_strncpy(cli_loc(cptr)->service, locargv[--i], NICKLEN + 1);
      else
        ircd_strncpy(cli_loc(cptr)->service, feature_str(FEAT_LOC_DEFAULT_SERVICE), NICKLEN + 1);
    }
  }

  if ((password[0] == '\0') && !(cli_loc(cptr)) && !emptypass)
    return need_more_params(cptr, "PASS");

  if (cli_loc(cptr) && (password[0] == '\0') && !emptypass) {
    if (cli_auth(cptr))
      auth_end_loc(cli_auth(cptr));
    MyFree(cli_loc(cptr));
  }

  if (cli_passwd(cptr)[0] == '\0')
    ircd_strncpy(cli_passwd(cptr), password, PASSWDLEN + 1);
  return cli_auth(cptr) ? auth_set_password(cli_auth(cptr), password) : 0;
}