/*
 * filesys.c -- part of filesys.mod
 *   main file of the filesys eggdrop module
 *
 * $Id: filesys.c,v 1.71 2006-05-29 01:56:08 wcc Exp $
 */
/*
 * Copyright (C) 1997 Robey Pointer
 * Copyright (C) 1999 - 2006 Eggheads Development Team
 *
 * 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.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#define MODULE_NAME "filesys"
#define MAKING_FILESYS

#include <fcntl.h>
#include <sys/stat.h>
#include <sys/file.h>

#include "src/mod/module.h"

#ifdef HAVE_DIRENT_H
#  include <dirent.h>
#  define NAMLEN(dirent) strlen((dirent)->d_name)
#else
#  define dirent direct
#  define NAMLEN(dirent) (dirent)->d_namlen
#  ifdef HAVE_SYS_NDIR_H
#    include <sys/ndir.h>
#  endif
#  ifdef HAVE_SYS_DIR_H
#    include <sys/dir.h>
#  endif
#  ifdef HAVE_NDIR_H
#    include <ndir.h>
#  endif
#endif

#ifdef TIME_WITH_SYS_TIME
#  include <sys/time.h>
#  include <time.h>
#else
#  ifdef HAVE_SYS_TIME_H
#    include <sys/time.h>
#  else
#    include <time.h>
#  endif
#endif

#include "filedb3.h"
#include "filesys.h"
#include "src/tandem.h"
#include "files.h"
#include "dbcompat.h"
#include "filelist.h"

static p_tcl_bind_list H_fil;
static Function *transfer_funcs = NULL;

#undef global /* Needs to be undef'd because of fcntl.h. */
static Function *global = NULL;

/* Root dcc directory */
static char dccdir[121] = "";

/* Directory to put incoming dcc's into */
static char dccin[121] = "";

/* Let all uploads go to the user's current directory? */
static int upload_to_cd = 0;

/* Maximum allowable file size for dcc send (1M). 0 indicates
 * unlimited file size. */
static int dcc_maxsize = 1024;

/* Maximum number of users can be in the file area at once */
static int dcc_users = 0;

/* Where to put the filedb, if not in a hidden '.filedb' file in
 * each directory. */
static char filedb_path[121] = "";

/* Prototypes */
static int is_valid();
static void eof_dcc_files(int idx);
static void dcc_files(int idx, char *buf, int i);
static void disp_dcc_files(int idx, char *buf);
static int expmem_dcc_files(void *x);
static void kill_dcc_files(int idx, void *x);
static void out_dcc_files(int idx, char *buf, void *x);
static char *mktempfile(char *filename);

static struct dcc_table DCC_FILES = {
  "FILES",
  DCT_MASTER | DCT_VALIDIDX | DCT_SHOWWHO | DCT_SIMUL | DCT_CANBOOT | DCT_FILES,
  eof_dcc_files,
  dcc_files,
  NULL,
  NULL,
  disp_dcc_files,
  expmem_dcc_files,
  kill_dcc_files,
  out_dcc_files
};

static struct user_entry_type USERENTRY_DCCDIR = {
  NULL,                         /* always NULL ;) */
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  "DCCDIR"
};

#include "files.c"
#include "filedb3.c"
#include "tclfiles.c"
#include "dbcompat.c"
#include "filelist.c"

/* Check for tcl-bound file command, return 1 if found
 * fil: proc-name <handle> <dcc-handle> <args...>
 */
static int check_tcl_fil(char *cmd, int idx, char *args)
{
  int x;
  char s[5];
  struct flag_record fr = { FR_GLOBAL | FR_CHAN, 0, 0, 0, 0, 0 };

  get_user_flagrec(dcc[idx].user, &fr, dcc[idx].u.file->chat->con_chan);
  sprintf(s, "%ld", dcc[idx].sock);
  Tcl_SetVar(interp, "_fil1", dcc[idx].nick, 0);
  Tcl_SetVar(interp, "_fil2", s, 0);
  Tcl_SetVar(interp, "_fil3", args, 0);
  x = check_tcl_bind(H_fil, cmd, &fr, " $_fil1 $_fil2 $_fil3",
                     MATCH_PARTIAL | BIND_USE_ATTR | BIND_HAS_BUILTINS);
  if (x == BIND_AMBIGUOUS) {
    dprintf(idx, "Ambiguous command.\n");
    return 0;
  }
  if (x == BIND_NOMATCH) {
    dprintf(idx, "What?  You need 'help'\n");
    return 0;
  }

  /* We return 1 to leave the filesys */
  if (x == BIND_QUIT)           /* CMD_LEAVE, 'quit' */
    return 1;

  if (x == BIND_EXEC_LOG)
    putlog(LOG_FILES, "*", "#%s# files: %s %s", dcc[idx].nick, cmd, args);
  return 0;
}

static void dcc_files_pass(int idx, char *buf, int x)
{
  struct userrec *u = get_user_by_handle(userlist, dcc[idx].nick);

  if (!x)
    return;
  if (u_pass_match(u, buf)) {
    if (too_many_filers()) {
      dprintf(idx, "Too many people are in the file system right now.\n");
      dprintf(idx, "Please try again later.\n");
      putlog(LOG_MISC, "*", "File area full: DCC chat [%s]%s", dcc[idx].nick,
             dcc[idx].host);
      killsock(dcc[idx].sock);
      lostdcc(idx);
      return;
    }
    dcc[idx].type = &DCC_FILES;
    if (dcc[idx].status & STAT_TELNET)
      dprintf(idx, "\377\374\001\n");   /* turn echo back on */
    putlog(LOG_FILES, "*", "File system: [%s]%s/%d", dcc[idx].nick,
           dcc[idx].host, dcc[idx].port);
    if (!welcome_to_files(idx)) {
      putlog(LOG_FILES, "*", "File system broken.");
      killsock(dcc[idx].sock);
      lostdcc(idx);
    } else {
      struct userrec *u = get_user_by_handle(userlist, dcc[idx].nick);

      touch_laston(u, "filearea", now);
    }
    return;
  }
  dprintf(idx, "Negative on that, Houston.\n");
  putlog(LOG_MISC, "*", "Bad password: DCC chat [%s]%s", dcc[idx].nick,
         dcc[idx].host);
  killsock(dcc[idx].sock);
  lostdcc(idx);
}

/* Hash function for file area commands.
 */
static int got_files_cmd(int idx, char *msg)
{
  char *code;

  strcpy(msg, check_tcl_filt(idx, msg));
  if (!msg[0])
    return 1;
  if (msg[0] == '.')
    msg++;
  code = newsplit(&msg);
  return check_tcl_fil(code, idx, msg);
}

static void dcc_files(int idx, char *buf, int i)
{
  if (buf[0] && detect_dcc_flood(&dcc[idx].timeval, dcc[idx].u.file->chat,
      idx))
    return;
  dcc[idx].timeval = now;
  strcpy(buf, check_tcl_filt(idx, buf));
  if (!buf[0])
    return;
  touch_laston(dcc[idx].user, "filearea", now);
  if (buf[0] == ',') {
    for (i = 0; i < dcc_total; i++) {
      if ((dcc[i].type->flags & DCT_MASTER) && dcc[idx].user &&
          (dcc[idx].user->flags & USER_MASTER) &&
          ((dcc[i].type == &DCC_FILES) || (dcc[i].u.chat->channel >= 0)) &&
          ((i != idx) || (dcc[idx].status & STAT_ECHO)))
        dprintf(i, "-%s- %s\n", dcc[idx].nick, &buf[1]);
    }
  } else if (got_files_cmd(idx, buf)) {
    dprintf(idx, "*** Ja mata!\n");
    flush_lines(idx, dcc[idx].u.file->chat);
    putlog(LOG_FILES, "*", "DCC user [%s]%s left file system", dcc[idx].nick,
           dcc[idx].host);
    set_user(&USERENTRY_DCCDIR, dcc[idx].user, dcc[idx].u.file->dir);
    if (dcc[idx].status & STAT_CHAT) {
      struct chat_info *ci;

      dprintf(idx, "Returning you to command mode...\n");
      ci = dcc[idx].u.file->chat;
      my_free(dcc[idx].u.file);
      dcc[idx].u.chat = ci;
      dcc[idx].status &= (~STAT_CHAT);
      dcc[idx].type = &DCC_CHAT;
      if (dcc[idx].u.chat->channel >= 0) {
        chanout_but(-1, dcc[idx].u.chat->channel,
                    "*** %s has returned.\n", dcc[idx].nick);
        if (dcc[idx].u.chat->channel < GLOBAL_CHANS)
          botnet_send_join_idx(idx, -1);
      }
    } else {
      dprintf(idx, "Dropping connection now.\n");
      putlog(LOG_FILES, "*", "Left files: [%s]%s/%d", dcc[idx].nick,
             dcc[idx].host, dcc[idx].port);
      killsock(dcc[idx].sock);
      lostdcc(idx);
    }
  }
  if (dcc[idx].status & STAT_PAGE)
    flush_lines(idx, dcc[idx].u.file->chat);
}

static void tell_file_stats(int idx, char *hand)
{
  struct userrec *u;
  struct filesys_stats *fs;
  float fr = (-1.0), kr = (-1.0);

  u = get_user_by_handle(userlist, hand);
  if (u == NULL)
    return;
  if (!(fs = get_user(&USERENTRY_FSTAT, u))) {
    dprintf(idx, "No file statistics for %s.\n", hand);
  } else {
    dprintf(idx, "  uploads: %4u / %6luk\n", fs->uploads, fs->upload_ks);
    dprintf(idx, "downloads: %4u / %6luk\n", fs->dnloads, fs->dnload_ks);
    if (fs->uploads)
      fr = ((float) fs->dnloads / (float) fs->uploads);
    if (fs->upload_ks)
      kr = ((float) fs->dnload_ks / (float) fs->upload_ks);
    if (fr < 0.0)
      dprintf(idx, "(infinite file leech)\n");
    else
      dprintf(idx, "leech ratio (files): %6.2f\n", fr);
    if (kr < 0.0)
      dprintf(idx, "(infinite size leech)\n");
    else
      dprintf(idx, "leech ratio (size) : %6.2f\n", kr);
  }
}

static int cmd_files(struct userrec *u, int idx, char *par)
{
  int atr = u ? u->flags : 0;
  static struct chat_info *ci;

  if (dccdir[0] == 0)
    dprintf(idx, "There is no file transfer area.\n");
  else if (too_many_filers()) {
    dprintf(idx, "The maximum of %d %s in the file area right now.\n",
            dcc_users, (dcc_users != 1) ? "people are" : "person is");
    dprintf(idx, "Please try again later.\n");
  } else {
    if (!(atr & (USER_MASTER | USER_XFER)))
      dprintf(idx, "You don't have access to the file area.\n");
    else {
      putlog(LOG_CMDS, "*", "#%s# files", dcc[idx].nick);
      dprintf(idx, "Entering file system...\n");
      if (dcc[idx].u.chat->channel >= 0) {

        chanout_but(-1, dcc[idx].u.chat->channel,
                    "*** %s has left: file system\n", dcc[idx].nick);
        if (dcc[idx].u.chat->channel < GLOBAL_CHANS)
          botnet_send_part_idx(idx, "file system");
      }
      ci = dcc[idx].u.chat;
      dcc[idx].u.file = get_data_ptr(sizeof(struct file_info));

      dcc[idx].u.file->chat = ci;
      dcc[idx].type = &DCC_FILES;
      dcc[idx].status |= STAT_CHAT;
      if (!welcome_to_files(idx)) {
        struct chat_info *ci = dcc[idx].u.file->chat;

        my_free(dcc[idx].u.file);
        dcc[idx].u.chat = ci;
        dcc[idx].type = &DCC_CHAT;
        putlog(LOG_FILES, "*", "File system broken.");
        if (dcc[idx].u.chat->channel >= 0) {
          chanout_but(-1, dcc[idx].u.chat->channel,
                      "*** %s has returned.\n", dcc[idx].nick);
          if (dcc[idx].u.chat->channel < GLOBAL_CHANS)
            botnet_send_join_idx(idx, -1);
        }
      } else
        touch_laston(u, "filearea", now);
    }
  }
  return 0;
}

static int _dcc_send(int idx, char *filename, char *nick, char *dir,
                     int resend)
{
  int x;
  char *nfn, *buf = NULL;

  if (strlen(nick) > NICKMAX)
    nick[NICKMAX] = 0;
  if (resend)
    x = raw_dcc_resend(filename, nick, dcc[idx].nick, dir);
  else
    x = raw_dcc_send(filename, nick, dcc[idx].nick, dir);
  if (x == DCCSEND_FULL) {
    dprintf(idx, "Sorry, too many DCC connections.  (try again later)\n");
    putlog(LOG_FILES, "*", "DCC connections full: %sGET %s [%s]", filename,
           resend ? "RE" : "", dcc[idx].nick);
    return 0;
  }
  if (x == DCCSEND_NOSOCK) {
    if (reserved_port_min) {
      dprintf(idx, "All my DCC SEND ports are in use.  Try later.\n");
      putlog(LOG_FILES, "*", "DCC port in use (can't open): %sGET %s [%s]",
             resend ? "RE" : "", filename, dcc[idx].nick);
    } else {
      dprintf(idx, "Unable to listen at a socket.\n");
      putlog(LOG_FILES, "*", "DCC socket error: %sGET %s [%s]", filename,
             resend ? "RE" : "", dcc[idx].nick);
    }
    return 0;
  }
  if (x == DCCSEND_BADFN) {
    dprintf(idx, "File not found ?\n");
    putlog(LOG_FILES, "*", "DCC file not found: %sGET %s [%s]", filename,
           resend ? "RE" : "", dcc[idx].nick);
    return 0;
  }
  if (x == DCCSEND_FEMPTY) {
    dprintf(idx, "The file is empty.  Aborted transfer.\n");
    putlog(LOG_FILES, "*", "DCC file is empty: %s [%s]", filename,
           dcc[idx].nick);
    return 0;
  }
  nfn = strrchr(dir, '/');
  if (nfn == NULL)
    nfn = dir;
  else
    nfn++;

  /* Eliminate any spaces in the filename. */
  if (strchr(nfn, ' ')) {
    char *p;

    malloc_strcpy(buf, nfn);
    p = nfn = buf;
    while ((p = strchr(p, ' ')) != NULL)
      *p = '_';
  }

  if (egg_strcasecmp(nick, dcc[idx].nick))
    dprintf(DP_HELP, "NOTICE %s :Here is %s file from %s %s...\n", nick,
            resend ? "the" : "a", dcc[idx].nick, resend ? "again " : "");
  dprintf(idx, "%sending: %s to %s\n", resend ? "Res" : "S", nfn, nick);
  my_free(buf);
  return 1;
}

static int do_dcc_send(int idx, char *dir, char *fn, char *nick, int resend)
{
  char *s = NULL, *s1 = NULL;
  int x;

  if (nick && strlen(nick) > NICKMAX)
    nick[NICKMAX] = 0;
  if (dccdir[0] == 0) {
    dprintf(idx, "DCC file transfers not supported.\n");
    putlog(LOG_FILES, "*", "Refused dcc %sget %s from [%s]", resend ? "re" : "",
           fn, dcc[idx].nick);
    return 0;
  }
  if (strchr(fn, '/') != NULL) {
    dprintf(idx, "Filename cannot have '/' in it...\n");
    putlog(LOG_FILES, "*", "Refused dcc %sget %s from [%s]", resend ? "re" : "",
           fn, dcc[idx].nick);
    return 0;
  }
  if (dir[0]) {
    s = nmalloc(strlen(dccdir) + strlen(dir) + strlen(fn) + 2);
    sprintf(s, "%s%s/%s", dccdir, dir, fn);
  } else {
    s = nmalloc(strlen(dccdir) + strlen(fn) + 1);
    sprintf(s, "%s%s", dccdir, fn);
  }

  if (!file_readable(s)) {
    dprintf(idx, "No such file.\n");
    putlog(LOG_FILES, "*", "Refused dcc %sget %s from [%s]", resend ? "re" :
           "", fn, dcc[idx].nick);
    my_free(s);
    return 0;
  }

  if (!nick || !nick[0])
    nick = dcc[idx].nick;
  /* Already have too many transfers active for this user?  queue it */
  if (at_limit(nick)) {
    char xxx[1024];

    sprintf(xxx, "%d*%s%s", strlen(dccdir), dccdir, dir);
    queue_file(xxx, fn, dcc[idx].nick, nick);
    dprintf(idx, "Queued: %s to %s\n", fn, nick);
    my_free(s);
    return 1;
  }
  if (copy_to_tmp) {
    char *tempfn = mktempfile(fn);

    /* Copy this file to /tmp, add a random prefix to the filename. */
    s = nrealloc(s, strlen(dccdir) + strlen(dir) + strlen(fn) + 2);
    sprintf(s, "%s%s%s%s", dccdir, dir, dir[0] ? "/" : "", fn);
    s1 = nrealloc(s1, strlen(tempdir) + strlen(tempfn) + 1);
    sprintf(s1, "%s%s", tempdir, tempfn);
    my_free(tempfn);
    if (copyfile(s, s1) != 0) {
      dprintf(idx, "Can't make temporary copy of file!\n");
      putlog(LOG_FILES | LOG_MISC, "*",
             "Refused dcc %sget %s: copy to %s FAILED!",
             resend ? "re" : "", fn, tempdir);
      my_free(s);
      my_free(s1);
      return 0;
    }
  } else {
    s1 = nrealloc(s1, strlen(dccdir) + strlen(dir) + strlen(fn) + 2);
    sprintf(s1, "%s%s%s%s", dccdir, dir, dir[0] ? "/" : "", fn);
  }
  s = nrealloc(s, strlen(dir) + strlen(fn) + 2);
  sprintf(s, "%s%s%s", dir, dir[0] ? "/" : "", fn);
  x = _dcc_send(idx, s1, nick, s, resend);
  if (x != DCCSEND_OK)
    wipe_tmp_filename(s1, -1);
  my_free(s);
  my_free(s1);
  return x;
}

static int builtin_fil STDVAR
{
  int idx;
  Function F = (Function) cd;

  BADARGS(4, 4, " hand idx param");

  CHECKVALIDITY(builtin_fil);
  idx = findanyidx(atoi(argv[2]));
  if (idx < 0 && dcc[idx].type != &DCC_FILES) {
    Tcl_AppendResult(irp, "invalid idx", NULL);
    return TCL_ERROR;
  }

  /* FIXME: This is an ugly hack. It is not documented as a
   *        'feature' because it will eventually go away.
   */
  if (F == CMD_LEAVE) {
    Tcl_AppendResult(irp, "break", NULL);
    return TCL_OK;
  }

  F(idx, argv[3]);
  Tcl_ResetResult(irp);
  return TCL_OK;
}

static void tout_dcc_files_pass(int i)
{
  dprintf(i, "Timeout.\n");
  putlog(LOG_MISC, "*", "Password timeout on dcc chat: [%s]%s", dcc[i].nick,
         dcc[i].host);
  killsock(dcc[i].sock);
  lostdcc(i);
}

static void disp_dcc_files(int idx, char *buf)
{
  sprintf(buf, "file  flags: %c%c%c%c%c",
          dcc[idx].status & STAT_CHAT ? 'C' : 'c',
          dcc[idx].status & STAT_PARTY ? 'P' : 'p',
          dcc[idx].status & STAT_TELNET ? 'T' : 't',
          dcc[idx].status & STAT_ECHO ? 'E' : 'e',
          dcc[idx].status & STAT_PAGE ? 'P' : 'p');
}

static void disp_dcc_files_pass(int idx, char *buf)
{
  sprintf(buf, "fpas  waited %lis", now - dcc[idx].timeval);
}

static void kill_dcc_files(int idx, void *x)
{
  register struct file_info *f = (struct file_info *) x;

  if (f->chat)
    DCC_CHAT.kill(idx, f->chat);
  my_free(x);
}

static void eof_dcc_files(int idx)
{
  dcc[idx].u.file->chat->con_flags = 0;
  putlog(LOG_MISC, "*", "Lost dcc connection to %s (%s/%d)", dcc[idx].nick,
         dcc[idx].host, dcc[idx].port);
  killsock(dcc[idx].sock);
  lostdcc(idx);
}

static int expmem_dcc_files(void *x)
{
  register struct file_info *p = (struct file_info *) x;
  int tot = sizeof(struct file_info);

  if (p->chat)
    tot += DCC_CHAT.expmem(p->chat);
  return tot;
}

static void out_dcc_files(int idx, char *buf, void *x)
{
  register struct file_info *p = (struct file_info *) x;

  if (p->chat)
    DCC_CHAT.output(idx, buf, p->chat);
  else
    tputs(dcc[idx].sock, buf, strlen(buf));
}

static cmd_t mydcc[] = {
  {"files", "-",  cmd_files, NULL},
  {NULL,    NULL, NULL,      NULL}
};

static tcl_strings mystrings[] = {
  {"files-path",    dccdir,      120, STR_DIR | STR_PROTECT},
  {"incoming-path", dccin,       120, STR_DIR | STR_PROTECT},
  {"filedb-path",   filedb_path, 120, STR_DIR | STR_PROTECT},
  {NULL,            NULL,        0,                       0}
};

static tcl_ints myints[] = {
  {"max-filesize",    &dcc_maxsize},
  {"max-file-users",    &dcc_users},
  {"upload-to-pwd",  &upload_to_cd},
  {NULL,                      NULL}
};

static struct dcc_table DCC_FILES_PASS = {
  "FILES_PASS",
  0,
  eof_dcc_files,
  dcc_files_pass,
  NULL,
  tout_dcc_files_pass,
  disp_dcc_files_pass,
  expmem_dcc_files,
  kill_dcc_files,
  out_dcc_files
};


static void filesys_dcc_send_hostresolved(int);

/* Received a ctcp-dcc.
 */
static void filesys_dcc_send(char *nick, char *from, struct userrec *u,
                             char *text)
{
  char *param, *ip, *prt, *buf = NULL, *msg;
  int atr = u ? u->flags : 0, i, j = 0;

  if (text[j] == '"') {
    text[j] = ' ';

    for (j = 1; text[j] != '"' && text[j] != '\0'; j++) {
      if (text[j] == ' ')
      {
        text[j] = '_';
      }
    }

    text[j] = ' ';
  }

  buf = nmalloc(strlen(text) + 1);
  msg = buf;
  strcpy(buf, text);
  param = newsplit(&msg);
  if (!(atr & USER_XFER)) {
    putlog(LOG_FILES, "*", "Refused DCC SEND %s (no access): %s!%s", param,
           nick, from);
    if (!quiet_reject)
      dprintf(DP_HELP, "NOTICE %s :No access\n", nick);
  } else if (!dccin[0] && !upload_to_cd) {
    dprintf(DP_HELP, "NOTICE %s :DCC file transfers not supported.\n", nick);
    putlog(LOG_FILES, "*", "Refused dcc send %s from %s!%s", param, nick, from);
  } else if (strchr(param, '/')) {
    dprintf(DP_HELP, "NOTICE %s :Filename cannot have '/' in it...\n", nick);
    putlog(LOG_FILES, "*", "Refused dcc send %s from %s!%s", param, nick, from);
  } else {
    ip = newsplit(&msg);
    prt = newsplit(&msg);
    if (atoi(prt) < 1024 || atoi(prt) > 65535) {
      /* Invalid port */
      dprintf(DP_HELP, "NOTICE %s :%s (invalid port)\n", nick,
              DCC_CONNECTFAILED1);
      putlog(LOG_FILES, "*", "Refused dcc send %s (%s): invalid port", param,
             nick);
    } else if (atoi(msg) == 0) {
      dprintf(DP_HELP, "NOTICE %s :Sorry, file size info must be included.\n",
              nick);
      putlog(LOG_FILES, "*", "Refused dcc send %s (%s): no file size",
             param, nick);
    } else if (dcc_maxsize && (atoi(msg) > (dcc_maxsize * 1024))) {
      dprintf(DP_HELP, "NOTICE %s :Sorry, file too large.\n", nick);
      putlog(LOG_FILES, "*", "Refused dcc send %s (%s): file too large", param,
             nick);
    } else {
      /* This looks like a good place for a sanity check. */
      if (!sanitycheck_dcc(nick, from, ip, prt)) {
        my_free(buf);
        return;
      }
      i = new_dcc(&DCC_DNSWAIT, sizeof(struct dns_info));
      if (i < 0) {
        dprintf(DP_HELP, "NOTICE %s :Sorry, too many DCC connections.\n", nick);
        putlog(LOG_MISC, "*", "DCC connections full: SEND %s (%s!%s)", param,
               nick, from);
        return;
      }
      dcc[i].addr = my_atoul(ip);
      dcc[i].port = atoi(prt);
      dcc[i].sock = -1;
      dcc[i].user = u;
      strcpy(dcc[i].nick, nick);
      strcpy(dcc[i].host, from);
      dcc[i].u.dns->cbuf = get_data_ptr(strlen(param) + 1);
      strcpy(dcc[i].u.dns->cbuf, param);
      dcc[i].u.dns->ibuf = atoi(msg);
      dcc[i].u.dns->ip = dcc[i].addr;
      dcc[i].u.dns->dns_type = RES_HOSTBYIP;
      dcc[i].u.dns->dns_success = filesys_dcc_send_hostresolved;
      dcc[i].u.dns->dns_failure = filesys_dcc_send_hostresolved;
      dcc[i].u.dns->type = &DCC_FORK_SEND;
      dcc_dnshostbyip(dcc[i].addr);
    }
  }
  my_free(buf);
}

/* Create a temporary filename with random elements. Shortens
 * the filename if the total string is longer than NAME_MAX.
 * The original buffer is not modified.   (Fabian)
 *
 * Please adjust MKTEMPFILE_TOT if you change any lengths
 *   7 - size of the random string
 *   2 - size of additional characters in "%u-%s-%s" format string
 *   8 - estimated size of getpid()'s output converted to %u */
#define MKTEMPFILE_TOT (7 + 2 + 8)
static char *mktempfile(char *filename)
{
  char rands[8], *tempname, *fn = filename;
  int l;

  make_rand_str(rands, 7);
  l = strlen(filename);
  if ((l + MKTEMPFILE_TOT) > NAME_MAX) {
    fn[NAME_MAX - MKTEMPFILE_TOT] = 0;
    l = NAME_MAX - MKTEMPFILE_TOT;
    fn = nmalloc(l + 1);
    strncpy(fn, filename, l);
    fn[l] = 0;
  }
  tempname = nmalloc(l + MKTEMPFILE_TOT + 1);
  sprintf(tempname, "%u-%s-%s", getpid(), rands, fn);
  if (fn != filename)
    my_free(fn);
  return tempname;
}

static void filesys_dcc_send_hostresolved(int i)
{
  char *s1, *param, prt[100], ip[100], *tempf;
  int len = dcc[i].u.dns->ibuf, j;

  sprintf(prt, "%d", dcc[i].port);
  sprintf(ip, "%lu", iptolong(htonl(dcc[i].addr)));
  if (!hostsanitycheck_dcc(dcc[i].nick, dcc[i].u.dns->host, dcc[i].addr,
                           dcc[i].u.dns->host, prt)) {
    lostdcc(i);
    return;
  }
  param = nmalloc(strlen(dcc[i].u.dns->cbuf) + 1);
  strcpy(param, dcc[i].u.dns->cbuf);

  changeover_dcc(i, &DCC_FORK_SEND, sizeof(struct xfer_info));
  if (param[0] == '.')
    param[0] = '_';
  /* Save the original filename */
  dcc[i].u.xfer->origname = get_data_ptr(strlen(param) + 1);
  strcpy(dcc[i].u.xfer->origname, param);
  tempf = mktempfile(param);
  dcc[i].u.xfer->filename = get_data_ptr(strlen(tempf) + 1);
  strcpy(dcc[i].u.xfer->filename, tempf);
  /* We don't need the temporary buffers anymore */
  my_free(tempf);
  my_free(param);

  if (upload_to_cd) {
    char *p = get_user(&USERENTRY_DCCDIR, dcc[i].user);

    if (p)
      sprintf(dcc[i].u.xfer->dir, "%s%s/", dccdir, p);
    else
      sprintf(dcc[i].u.xfer->dir, "%s", dccdir);
  } else
    strcpy(dcc[i].u.xfer->dir, dccin);
  dcc[i].u.xfer->length = len;
  s1 = nmalloc(strlen(dcc[i].u.xfer->dir) +
               strlen(dcc[i].u.xfer->origname) + 1);
  sprintf(s1, "%s%s", dcc[i].u.xfer->dir, dcc[i].u.xfer->origname);

  if (file_readable(s1)) {
    dprintf(DP_HELP, "NOTICE %s :File `%s' already exists.\n", dcc[i].nick,
            dcc[i].u.xfer->origname);
    lostdcc(i);
    my_free(s1);
  } else {
    my_free(s1);
    /* Check for dcc-sends in process with the same filename */
    for (j = 0; j < dcc_total; j++)
      if (j != i) {
        if ((dcc[j].type->flags & (DCT_FILETRAN | DCT_FILESEND)) ==
            (DCT_FILETRAN | DCT_FILESEND)) {
          if (!strcmp(dcc[i].u.xfer->origname, dcc[j].u.xfer->origname)) {
            dprintf(DP_HELP, "NOTICE %s :File `%s' is already being sent.\n",
                    dcc[i].nick, dcc[i].u.xfer->origname);
            lostdcc(i);
            return;
          }
        }
      }
    /* Put uploads in /tmp first */
    s1 = nmalloc(strlen(tempdir) + strlen(dcc[i].u.xfer->filename) + 1);
    sprintf(s1, "%s%s", tempdir, dcc[i].u.xfer->filename);
    dcc[i].u.xfer->f = fopen(s1, "w");
    my_free(s1);
    if (dcc[i].u.xfer->f == NULL) {
      dprintf(DP_HELP,
              "NOTICE %s :Can't create file `%s' (temp dir error)\n",
              dcc[i].nick, dcc[i].u.xfer->origname);
      lostdcc(i);
    } else {
      dcc[i].timeval = now;
      dcc[i].sock = getsock(SOCK_BINARY);
      if (dcc[i].sock < 0 || open_telnet_dcc(dcc[i].sock, ip, prt) < 0)
        dcc[i].type->eof(i);
    }
  }
}

/* This only handles CHAT requests, otherwise it's handled in transfer.
 */
static int filesys_DCC_CHAT(char *nick, char *from, char *handle,
                            char *object, char *keyword, char *text)
{
  char *param, *ip, *prt, buf[512], *msg = buf;
  int i, sock;
  struct userrec *u = get_user_by_handle(userlist, handle);
  struct flag_record fr = { FR_GLOBAL | FR_CHAN | FR_ANYWH, 0, 0, 0, 0, 0 };

  if (egg_strcasecmp(object, botname))
    return 0;
  if (!egg_strncasecmp(text, "SEND ", 5)) {
    filesys_dcc_send(nick, from, u, text + 5);
    return 1;
  }
  if (egg_strncasecmp(text, "CHAT ", 5) || !u)
    return 0;
  strcpy(buf, text + 5);
  get_user_flagrec(u, &fr, 0);
  param = newsplit(&msg);
  if (dcc_total == max_dcc) {
    putlog(LOG_MISC, "*", DCC_TOOMANYDCCS2, "CHAT(file)", param, nick, from);
  } else if (glob_party(fr) || (!require_p && chan_op(fr)))
    return 0;                   /* Allow ctcp.so to pick up the chat */
  else if (!glob_xfer(fr)) {
    if (!quiet_reject)
      dprintf(DP_HELP, "NOTICE %s :%s\n", nick, DCC_REFUSED2);
    putlog(LOG_MISC, "*", "%s: %s!%s", DCC_REFUSED, nick, from);
  } else if (u_pass_match(u, "-")) {
    if (!quiet_reject)
      dprintf(DP_HELP, "NOTICE %s :%s\n", nick, DCC_REFUSED3);
    putlog(LOG_MISC, "*", "%s: %s!%s", DCC_REFUSED4, nick, from);
  } else if (!dccdir[0]) {
    putlog(LOG_MISC, "*", "%s: %s!%s", DCC_REFUSED5, nick, from);
  } else {
    ip = newsplit(&msg);
    prt = newsplit(&msg);
    sock = getsock(0);
    if (sock < 0 || open_telnet_dcc(sock, ip, prt) < 0) {
      neterror(buf);
      if (!quiet_reject)
        dprintf(DP_HELP, "NOTICE %s :%s (%s)\n", nick, DCC_CONNECTFAILED1, buf);
      putlog(LOG_MISC, "*", "%s: CHAT(file) (%s!%s)", DCC_CONNECTFAILED2, nick,
             from);
      putlog(LOG_MISC, "*", "    (%s)", buf);
      killsock(sock);
    } else if (atoi(prt) < 1024 || atoi(prt) > 65535) {
      /* Invalid port */
      if (!quiet_reject)
        dprintf(DP_HELP, "NOTICE %s :%s (invalid port)\n", nick,
                DCC_CONNECTFAILED1);
      putlog(LOG_FILES, "*", "%s: %s!%s", DCC_REFUSED7, nick, from);

    } else {
      i = new_dcc(&DCC_FILES_PASS, sizeof(struct file_info));
      dcc[i].addr = my_atoul(ip);
      dcc[i].port = atoi(prt);
      dcc[i].sock = sock;
      strcpy(dcc[i].nick, u->handle);
      strcpy(dcc[i].host, from);
      dcc[i].status = STAT_ECHO;
      dcc[i].timeval = now;
      dcc[i].u.file->chat = get_data_ptr(sizeof(struct chat_info));
      strcpy(dcc[i].u.file->chat->con_chan, "*");
      dcc[i].user = u;
      putlog(LOG_MISC, "*", "DCC connection: CHAT(file) (%s!%s)", nick, from);
      dprintf(i, "%s\n", DCC_ENTERPASS);
    }
  }
  return 1;
}

static cmd_t myctcp[] = {
  {"DCC", "",   filesys_DCC_CHAT, "files:DCC"},
  {NULL,  NULL, NULL,                    NULL}
};

static void init_server_ctcps(char *module)
{
  p_tcl_bind_list H_ctcp;

  if ((H_ctcp = find_bind_table("ctcp")))
    add_builtins(H_ctcp, myctcp);
}

static cmd_t myload[] = {
  {"server", "",   (Function) init_server_ctcps, "filesys:server"},
  {NULL,     NULL, NULL,                                     NULL}
};

static int filesys_expmem()
{
  return 0;
}

static void filesys_report(int idx, int details)
{
  if (details) {
    int size = filesys_expmem();

    if (dccdir[0]) {
      dprintf(idx, "    DCC file path: %s", dccdir);
      if (upload_to_cd)
        dprintf(idx, "\n      Incoming: (user's current directory)\n");
      else if (dccin[0])
        dprintf(idx, "\n      Incoming: %s\n", dccin);
      else
        dprintf(idx, " (no uploads)\n");

      if (dcc_users)
        dprintf(idx, "    Max users: %d\n", dcc_users);
      if (upload_to_cd || dccin[0])
        dprintf(idx, "    Max upload file size: %dk\n", dcc_maxsize);
    } else
      dprintf(idx, "    Filesystem module loaded, but no active dcc path "
              "exists.\n");
    dprintf(idx, "    Using %d byte%s of memory\n", size,
            (size != 1) ? "s" : "");
  }
}

static char *filesys_close()
{
  int i;
  p_tcl_bind_list H_ctcp;

  putlog(LOG_MISC, "*", "Unloading filesystem; killing all filesystem "
         "connections.");
  for (i = 0; i < dcc_total; i++)
    if (dcc[i].type == &DCC_FILES) {
      dprintf(i, DCC_BOOTED1);
      dprintf(i, "You have been booted from the filesystem, module "
              "unloaded.\n");
      killsock(dcc[i].sock);
      lostdcc(i);
    } else if (dcc[i].type == &DCC_FILES_PASS) {
      killsock(dcc[i].sock);
      lostdcc(i);
    }
  rem_tcl_commands(mytcls);
  rem_tcl_strings(mystrings);
  rem_tcl_ints(myints);
  rem_builtins(H_dcc, mydcc);
  rem_builtins(H_load, myload);
  rem_builtins(H_fil, myfiles);
  rem_help_reference("filesys.help");
  if ((H_ctcp = find_bind_table("ctcp")))
    rem_builtins(H_ctcp, myctcp);
  del_bind_table(H_fil);
  del_entry_type(&USERENTRY_DCCDIR);
  del_lang_section("filesys");
  module_undepend(MODULE_NAME);
  return NULL;
}

EXPORT_SCOPE char *filesys_start();

static Function filesys_table[] = {
  /* 0 - 3 */
  (Function) filesys_start,
  (Function) filesys_close,
  (Function) filesys_expmem,
  (Function) filesys_report,
  /* 4 - 7 */
  (Function) remote_filereq,
  (Function) add_file,
  (Function) incr_file_gots,
  (Function) is_valid,
  /* 8 - 11 */
  (Function) & H_fil,
};

char *filesys_start(Function *global_funcs)
{
  global = global_funcs;

  module_register(MODULE_NAME, filesys_table, 2, 0);
  if (!module_depend(MODULE_NAME, "eggdrop", 106, 0)) {
    module_undepend(MODULE_NAME);
    return "This module requires Eggdrop 1.6.0 or later.";
  }
  if (!(transfer_funcs = module_depend(MODULE_NAME, "transfer", 2, 0))) {
    module_undepend(MODULE_NAME);
    return "This module requires transfer module 2.0 or later.";
  }
  add_tcl_commands(mytcls);
  add_tcl_strings(mystrings);
  add_tcl_ints(myints);
  H_fil = add_bind_table("fil", 0, builtin_fil);
  add_builtins(H_dcc, mydcc);
  add_builtins(H_fil, myfiles);
  add_builtins(H_load, myload);
  add_help_reference("filesys.help");
  init_server_ctcps(0);
  my_memcpy(&USERENTRY_DCCDIR, &USERENTRY_INFO,
            sizeof(struct user_entry_type) - sizeof(char *));

  USERENTRY_DCCDIR.got_share = 0;       /* We dont want it shared tho */
  add_entry_type(&USERENTRY_DCCDIR);
  DCC_FILES_PASS.timeout_val = &password_timeout;
  add_lang_section("filesys");
  return NULL;
}

static int is_valid()
{
  return dccdir[0];
}
