modules/core/m_join.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  m_join.c: Joins a channel.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  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
 *
 *  $Id$
 */

#include "stdinc.h"
#include "tools.h"
#include "handlers.h"
#include "channel.h"
#include "channel_mode.h"
#include "client.h"
#include "common.h"   /* bleah */
#include "hash.h"
#include "irc_string.h"
#include "sprintf_irc.h"
#include "ircd.h"
#include "list.h"
#include "numeric.h"
#include "send.h"
#include "s_serv.h"
#include "s_conf.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"


static void m_join(struct Client *, struct Client *, int, char **);
static void ms_join(struct Client *, struct Client *, int, char **);
static void do_join_0(struct Client *client_p, struct Client *source_p);

static void set_final_mode(struct Mode *, struct Mode *);
static void remove_our_modes(struct Channel *, struct Client *);
static void remove_a_mode(struct Channel *, struct Client *, int, char);

static char modebuf[MODEBUFLEN];
static char parabuf[MODEBUFLEN];
static char sendbuf[MODEBUFLEN];
static char *mbuf;

struct Message join_msgtab = {
  "JOIN", 0, 0, 2, 0, MFLG_SLOW, 0,
  {m_unregistered, m_join, ms_join, m_ignore, m_join, m_ignore}
};

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

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

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

/* last0() stolen from ircu */
static char *
last0(struct Client *client_p, struct Client *source_p, char *chanlist)
{
  char *p;
  int join0 = 0;

  for (p = chanlist; *p; ++p) /* find last "JOIN 0" */
  {
    if (*p == '0' && (*(p + 1) == ',' || *(p + 1) == '\0'))
    {
      if ((*p + 1) == ',')
        ++p;

      chanlist = p + 1;
      join0 = 1;
    }
    else
    {
      while (*p != ',' && *p != '\0') /* skip past channel name */
        ++p;

      if (*p == '\0') /* hit the end */
        break;
    }
  }

  if (join0)
    do_join_0(client_p, source_p);

  return chanlist;
}

/* m_join()
 *      parv[0] = sender prefix
 *      parv[1] = channel
 *      parv[2] = channel password (key)
 */
static void
m_join(struct Client *client_p, struct Client *source_p,
       int parc, char *parv[])
{
  char *p = NULL;
  char *key_list = NULL;
  char *chan_list = NULL;
  char *chan = NULL;
  struct Channel *chptr = NULL;
  int i = 0;
  unsigned int flags = 0;
  unsigned int error_reported = 0;

  if (*parv[1] == '\0')
  {
    sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
               me.name, source_p->name, "JOIN");
    return;
  }

  assert(client_p == source_p);

  key_list = parv[2];
  chan_list = last0(client_p, source_p, parv[1]);

  for (chan = strtoken(&p, chan_list, ","); chan;
       chan = strtoken(&p, NULL,      ","))
  {
    char *key = NULL;

    /* If we have any more keys, take the first for this channel. */
    if (!EmptyString(key_list) && (key_list = strchr(key = key_list, ',')))
      *key_list++ = '\0';

    /* Empty keys are the same as no keys. */
    if (key && *key == '\0')
      key = NULL;

    if (!IsChanPrefix(*chan) || !check_channel_name(chan))
    {
      sendto_one(source_p, form_str(ERR_BADCHANNAME),
                 me.name, source_p->name, chan);
      continue;
    }

    if (ConfigChannel.disable_local_channels && (*chan == '&'))
    {
      sendto_one(source_p, form_str(ERR_NOSUCHCHANNEL),
                 me.name, source_p->name, chan);
      continue;
    }

    if (strlen(chan) > LOCAL_CHANNELLEN)
    {
      sendto_one(source_p, form_str(ERR_BADCHANNAME),
                 me.name, source_p->name, chan);
      continue;
    }

    if (!IsExemptResv(source_p) &&
        !(IsOper(source_p) && ConfigFileEntry.oper_pass_resv) &&
        (!hash_find_resv(chan) == ConfigChannel.restrict_channels))
    {
      sendto_one(source_p, form_str(ERR_BADCHANNAME),
                 me.name, source_p->name, chan);
      sendto_realops_flags(UMODE_SPY, L_ALL,
                           "User %s (%s@%s) is attempting to join locally juped channel %s",
                           source_p->name, source_p->username, source_p->host, chan);
      continue;
    }

    if ((dlink_list_length(&source_p->channel) >= ConfigChannel.max_chans_per_user) &&
        (!IsOper(source_p) || (dlink_list_length(&source_p->channel) >=
                               ConfigChannel.max_chans_per_user * 3)))
    {
      if (!error_reported++)
        sendto_one(source_p, form_str(ERR_TOOMANYCHANNELS),
                   me.name, source_p->name, chan);
      continue;
    }

    if ((chptr = hash_find_channel(chan)) != NULL)
    {
      if (IsMember(source_p, chptr))
        continue;

      if (splitmode && !IsOper(source_p) && (*chan != '&') &&
          ConfigChannel.no_join_on_split)
      {
        sendto_one(source_p, form_str(ERR_UNAVAILRESOURCE),
                   me.name, source_p->name, chan);
        continue;
      }

      /*
       * This should never be the case unless there is some sort of
       * persistant channels.
       */
      if (dlink_list_length(&chptr->members) == 0)
        flags = CHFL_CHANOP;
      else
        flags = 0;
    }
    else
    {
      if (splitmode && !IsOper(source_p) && (*chan != '&') &&
          (ConfigChannel.no_create_on_split || ConfigChannel.no_join_on_split))
      {
        sendto_one(source_p, form_str(ERR_UNAVAILRESOURCE),
                   me.name, source_p->name, chan);
        continue;
      }

      flags = CHFL_CHANOP;

      if ((chptr = get_or_create_channel(source_p, chan, NULL)) == NULL)
      {
        sendto_one(source_p, form_str(ERR_UNAVAILRESOURCE),
                   me.name, source_p->name, chan);
        continue;
      }
    }

    if (!IsOper(source_p))
      check_spambot_warning(source_p, chptr->chname);

    /*
     * can_join checks for +i key, bans.
     */
    if ((i = can_join(source_p, chptr, key)))
    {
      sendto_one(source_p, form_str(i), me.name,
                 source_p->name, chptr->chname);
      continue;
    }

    add_user_to_channel(chptr, source_p, flags, YES);

    /*
     *  Set timestamp if appropriate, and propagate
     */
    if (flags & CHFL_CHANOP)
    {
      chptr->channelts = CurrentTime;
      chptr->mode.mode |= MODE_TOPICLIMIT;
      chptr->mode.mode |= MODE_NOPRIVMSGS;

      sendto_server(client_p, source_p, chptr, CAP_TS6, NOCAPS, LL_ICLIENT,
                    ":%s SJOIN %lu %s +nt :@%s",
                    me.id, (unsigned long)chptr->channelts,
                    chptr->chname, source_p->id);
      sendto_server(client_p, source_p, chptr, NOCAPS, CAP_TS6, LL_ICLIENT,
                    ":%s SJOIN %lu %s +nt :@%s",
                    me.name, (unsigned long)chptr->channelts,
                    chptr->chname, parv[0]);
      /*
       * notify all other users on the new channel
       */
      sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN :%s",
                           source_p->name, source_p->username,
                           source_p->host, chptr->chname);
      sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s +nt",
                           me.name, chptr->chname);
    }
    else
    {
      sendto_server(client_p, source_p, chptr, CAP_TS6, NOCAPS, LL_ICLIENT,
                    ":%s JOIN %lu %s +",
                    source_p->id, (unsigned long)chptr->channelts,
                    chptr->chname);
      sendto_server(client_p, source_p, chptr, NOCAPS, CAP_TS6, LL_ICLIENT,
                    ":%s SJOIN %lu %s + :%s",
                    me.name, (unsigned long)chptr->channelts,
                    chptr->chname, source_p->name);

      sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN :%s",
                           source_p->name, source_p->username,
                           source_p->host, chptr->chname);
    }

    del_invite(chptr, source_p);

    if (chptr->topic != NULL)
    {
      sendto_one(source_p, form_str(RPL_TOPIC), me.name,
                 source_p->name, chptr->chname, chptr->topic);

      sendto_one(source_p, form_str(RPL_TOPICWHOTIME),
                 me.name, source_p->name, chptr->chname,
                 chptr->topic_info, chptr->topic_time);
    }

    channel_member_names(source_p, chptr, 1);

    source_p->localClient->last_join_time = CurrentTime;
  }
}

/* ms_join()
 *
 * inputs       - parv[0] = uid
 *                parv[1] = ts
 *                parv[2] = channel name
 *                parv[3] = modes
 * output       - none
 * side effects - handles remote JOIN's sent by servers. In TSora
 *                remote clients are joined using SJOIN, hence a 
 *                JOIN sent by a server on behalf of a client is an error.
 *                here, the initial code is in to take an extra parameter
 *                and use it for the TimeStamp on a new channel.
 */
static void 
ms_join(struct Client *client_p, struct Client *source_p,
        int parc, char *parv[])
{
  struct Channel *chptr;
  time_t         newts;
  time_t         oldts;
  static         struct Mode mode, *oldmode;
  int            args = 0;
  int            keep_our_modes = 1;
  int            keep_new_modes = 1;
  int            isnew;
  char           *s;
  const char *servername;

  if ((parv[1][0] == '0') && (parv[1][1] == '\0') && parc == 2)
  {
    do_join_0(client_p, source_p);
    return;
  }

  if (parc < 4)
    return;

  if (*parv[2] == '&')
    return;

  if (!check_channel_name(parv[2]))
    return;

  mbuf = modebuf;
  mode.mode = mode.limit = 0;
  mode.key[0] = '\0';

  s = parv[3];
  while (*s)
  {
    switch (*(s++))
    {
      case 't':
        mode.mode |= MODE_TOPICLIMIT;
        break;
      case 'n':
        mode.mode |= MODE_NOPRIVMSGS;
        break;
      case 's':
        mode.mode |= MODE_SECRET;
        break;
      case 'm':
        mode.mode |= MODE_MODERATED;
        break;
      case 'i':
        mode.mode |= MODE_INVITEONLY;
        break;
      case 'p':
        mode.mode |= MODE_PRIVATE;
        break;
      case 'k':
        if (parc < 5+args)
          return;

        strlcpy(mode.key, parv[4 + args], sizeof(mode.key));
        args++;
        break;
      case 'l':
        if (parc < 5+args)
          return;

        mode.limit = atoi(parv[4 + args]);
        args++;
        break;
    }
  }

  if ((chptr = get_or_create_channel(source_p, parv[2], &isnew)) == NULL)
    return; /* channel name too long? */

  newts = atol(parv[1]);
  oldts   = chptr->channelts;
  oldmode = &chptr->mode;

  if (ConfigFileEntry.ignore_bogus_ts)
  {
    if (newts < 800000000)
    {
      sendto_realops_flags(UMODE_DEBUG, L_ALL,
                           "*** Bogus TS %lu on %s ignored from %s",
                           (unsigned long)newts, chptr->chname,
                           client_p->name);

      newts = (oldts == 0) ? 0 : 800000000;
    }
  }
  else
  {
    if (!newts && !isnew && oldts)
    {
      sendto_channel_local(ALL_MEMBERS, NO, chptr,
                             ":%s NOTICE %s :*** Notice -- TS for %s changed from %lu to 0",
                             me.name, chptr->chname, chptr->chname, (unsigned long)oldts);
      sendto_realops_flags(UMODE_ALL, L_ALL,
                           "Server %s changing TS on %s from %lu to 0",
                           source_p->name, chptr->chname, (unsigned long)oldts);
    }
  }

  if (isnew)
    chptr->channelts = newts;
  else if (newts == 0 || oldts == 0)
    chptr->channelts = 0;
  else if (newts == oldts)
    ;
  else if (newts < oldts)
  {
    keep_our_modes = NO;
    chptr->channelts = newts;
  }
  else
    keep_new_modes = NO;

  if (!keep_new_modes)
    mode = *oldmode;
  else if (keep_our_modes)
  {
    mode.mode |= oldmode->mode;
    if (oldmode->limit > mode.limit)
      mode.limit = oldmode->limit;
    if (strcmp(mode.key, oldmode->key) < 0)
      strcpy(mode.key, oldmode->key);
  }

  set_final_mode(&mode, oldmode);
  chptr->mode = mode;

  /* Lost the TS, other side wins, so remove modes on this side */
  if (!keep_our_modes)
  {
    remove_our_modes(chptr, source_p);
    sendto_channel_local(ALL_MEMBERS, NO, chptr,
                         ":%s NOTICE %s :*** Notice -- TS for %s changed from %lu to %lu",
                          me.name, chptr->chname, chptr->chname,
                         (unsigned long)oldts, (unsigned long)newts);
  }
   
  if (*modebuf != '\0')
  {
    servername = (ConfigServerHide.hide_servers || IsHidden(source_p)) ?
                  me.name : source_p->name;

    /* This _SHOULD_ be to ALL_MEMBERS
     * It contains only +imnpstlk, etc */
    sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s %s",
                         servername, chptr->chname, modebuf, parabuf);
  }

  if (!IsMember(source_p, chptr))
  {
    add_user_to_channel(chptr, source_p, 0, YES);
    sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN :%s",
                         source_p->name, source_p->username,
                         source_p->host, chptr->chname);
  }

  sendto_server(client_p, NULL, chptr, CAP_TS6, NOCAPS, NOFLAGS,
                ":%s JOIN %lu %s +",
                ID(source_p), (unsigned long)chptr->channelts, chptr->chname);
  sendto_server(client_p, NULL, chptr, NOCAPS, CAP_TS6, NOFLAGS,
                ":%s SJOIN %lu %s + :%s",
                source_p->servptr->name, (unsigned long)chptr->channelts,
                chptr->chname, source_p->name);
}

/* do_join_0()
 *
 * inputs       - pointer to client doing join 0
 * output       - NONE
 * side effects - Use has decided to join 0. This is legacy
 *                from the days when channels were numbers not names. *sigh*
 *                There is a bunch of evilness necessary here due to
 *                anti spambot code.
 */
static void
do_join_0(struct Client *client_p, struct Client *source_p)
{
  struct Channel *chptr = NULL;
  dlink_node *ptr = NULL, *ptr_next = NULL;

  if (source_p->channel.head && MyConnect(source_p) && !IsOper(source_p))
    check_spambot_warning(source_p, NULL);

  DLINK_FOREACH_SAFE(ptr, ptr_next, source_p->channel.head)
  {
    chptr = ((struct Membership *)ptr->data)->chptr;

    sendto_server(client_p, NULL, chptr, CAP_TS6, NOCAPS, NOFLAGS,
                  ":%s PART %s", ID(source_p), chptr->chname);
    sendto_server(client_p, NULL, chptr, NOCAPS, CAP_TS6, NOFLAGS,
                  ":%s PART %s", source_p->name, chptr->chname);
    sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s PART %s",
                         source_p->name, source_p->username,
                         source_p->host, chptr->chname);

    remove_user_from_channel(ptr->data);
  }
}

/* set_final_mode()
 *
 * inputs       - pointer to mode to setup
 *              - pointer to old mode
 * output       - NONE
 * side effects -
 */
static const struct mode_letter
{
  unsigned int mode;
  unsigned char letter;
} flags[] = {
  { MODE_NOPRIVMSGS, 'n' },
  { MODE_TOPICLIMIT, 't' },
  { MODE_SECRET,     's' },
  { MODE_MODERATED,  'm' },
  { MODE_INVITEONLY, 'i' },
  { MODE_PRIVATE,    'p' },
  { 0, '\0' }
};

static void
set_final_mode(struct Mode *mode, struct Mode *oldmode)
{
  char *pbuf = parabuf;
  int what   = 0;
  int len;
  int i;

  for (i = 0; flags[i].letter; i++)
  {
    if ((flags[i].mode & mode->mode) &&
        !(flags[i].mode & oldmode->mode))
    {
      if (what != 1)
      {
        *mbuf++ = '+';
        what = 1;
      }
      *mbuf++ = flags[i].letter;
    }
  }

  for (i = 0; flags[i].letter; i++)
  {
    if ((flags[i].mode & oldmode->mode) &&
        !(flags[i].mode & mode->mode))
    {
      if (what != -1)
      {
        *mbuf++ = '-';
        what = -1;
      }
      *mbuf++ = flags[i].letter;
    }
  }

  if (oldmode->limit != 0 && mode->limit == 0)
  {
    if (what != -1)
    {
      *mbuf++ = '-';
      what = -1;
    }
    *mbuf++ = 'l';
  }

  if (oldmode->key[0] && !mode->key[0])
  {
    if (what != -1)
    {
      *mbuf++ = '-';
      what = -1;
    }
    *mbuf++ = 'k';
    len = ircsprintf(pbuf, "%s ", oldmode->key);
    pbuf += len;
  }

  if (mode->limit != 0 && oldmode->limit != mode->limit)
  {
    if (what != 1)
    {
      *mbuf++ = '+';
      what = 1;
    }
    *mbuf++ = 'l';
    len = ircsprintf(pbuf, "%d ", mode->limit);
    pbuf += len;
  }

  if (mode->key[0] && strcmp(oldmode->key, mode->key))
  {
    if (what != 1)
    {
      *mbuf++ = '+';
      what = 1;
    }
    *mbuf++ = 'k';
    len = ircsprintf(pbuf, "%s ", mode->key);
    pbuf += len;
  }
  *mbuf = '\0';
}

/* remove_our_modes()
 *
 * inputs       - pointer to channel to remove modes from
 *              - client pointer
 * output       - NONE
 * side effects - Go through the local members, remove all their
 *                chanop modes etc., this side lost the TS.
 */
static void
remove_our_modes(struct Channel *chptr, struct Client *source_p)
{
  remove_a_mode(chptr, source_p, CHFL_CHANOP, 'o');
#ifdef HALFOPS
  remove_a_mode(chptr, source_p, CHFL_HALFOP, 'h');
#endif
  remove_a_mode(chptr, source_p, CHFL_VOICE, 'v');
}

/* remove_a_mode()
 *
 * inputs       -
 * output       - NONE
 * side effects - remove ONE mode from a channel
 */
static void
remove_a_mode(struct Channel *chptr, struct Client *source_p,
              int mask, char flag)
{
  dlink_node *ptr;
  struct Membership *ms;
  char lmodebuf[MODEBUFLEN];
  const char *lpara[MAXMODEPARAMS];
  int count = 0;
  int lcount;

  mbuf = lmodebuf;
  *mbuf++ = '-';

  for (lcount = 0; lcount < MAXMODEPARAMS; lcount++)
    lpara[lcount] = "";
  sendbuf[0] = '\0';

  DLINK_FOREACH(ptr, chptr->members.head)
  {
    ms = ptr->data;

    if ((ms->flags & mask) == 0)
      continue;

    ms->flags &= ~mask;

    lpara[count++] = ms->client_p->name;

    *mbuf++ = flag;

    if (count >= MAXMODEPARAMS)
    {
      for (lcount = 0; lcount < MAXMODEPARAMS; lcount++)
      {
        if (*lpara[lcount] == '\0')
          break;

        strlcat(sendbuf, " ", sizeof(sendbuf));
        strlcat(sendbuf, lpara[lcount], sizeof(sendbuf));
        lpara[lcount] = "";
      }

      *mbuf = '\0';
      sendto_channel_local(ALL_MEMBERS, NO, chptr,
                           ":%s MODE %s %s%s",
                           (IsHidden(source_p) ||
                           ConfigServerHide.hide_servers) ?
                           me.name : source_p->name,
                           chptr->chname, lmodebuf, sendbuf);
      mbuf = lmodebuf;
      *mbuf++ = '-';
      count = 0;
      sendbuf[0] = '\0';
    }
  }

  if (count != 0)
  {
    *mbuf = '\0';
    for (lcount = 0; lcount < MAXMODEPARAMS; lcount++)
    {
      if (*lpara[lcount] == '\0')
        break;

      strlcat(sendbuf, " ", sizeof(sendbuf));
      strlcat(sendbuf, lpara[lcount], sizeof(sendbuf));
    }
    sendto_channel_local(ALL_MEMBERS, NO, chptr,
                         ":%s MODE %s %s%s",
                         (IsHidden(source_p) || ConfigServerHide.hide_servers) ?
                         me.name : source_p->name,
                         chptr->chname, lmodebuf, sendbuf);
  }
}

Revision:	488
Committed:	Wed Mar 1 12:40:31 2006 UTC (18 years, 1 month ago) by michael
Content type:	text/x-csrc
File size:	19633 byte(s)
Log Message:	- Rewrote m_join(). This was mainly done to fix some bug that can be easily abused. Details about this bug have been given on IRC.
#	User	Rev	Content
1	adx	30	/*
2			* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3			* m_join.c: Joins a channel.
4			*
5			* Copyright (C) 2002 by the past and present ircd coders, and others.
6			*
7			* This program is free software; you can redistribute it and/or modify
8			* it under the terms of the GNU General Public License as published by
9			* the Free Software Foundation; either version 2 of the License, or
10			* (at your option) any later version.
11			*
12			* This program is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			* GNU General Public License for more details.
16			*
17			* You should have received a copy of the GNU General Public License
18			* along with this program; if not, write to the Free Software
19			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20			* USA
21			*
22	knight	31	* $Id$
23	adx	30	*/
24
25			#include "stdinc.h"
26			#include "tools.h"
27			#include "handlers.h"
28			#include "channel.h"
29			#include "channel_mode.h"
30			#include "client.h"
31			#include "common.h" /* bleah */
32			#include "hash.h"
33			#include "irc_string.h"
34			#include "sprintf_irc.h"
35			#include "ircd.h"
36			#include "list.h"
37			#include "numeric.h"
38			#include "send.h"
39			#include "s_serv.h"
40			#include "s_conf.h"
41			#include "msg.h"
42			#include "parse.h"
43			#include "modules.h"
44
45
46			static void m_join(struct Client , struct Client , int, char **);
47			static void ms_join(struct Client , struct Client , int, char **);
48			static void do_join_0(struct Client client_p, struct Client source_p);
49
50			static void set_final_mode(struct Mode , struct Mode );
51			static void remove_our_modes(struct Channel , struct Client );
52			static void remove_a_mode(struct Channel , struct Client , int, char);
53
54			static char modebuf[MODEBUFLEN];
55			static char parabuf[MODEBUFLEN];
56			static char sendbuf[MODEBUFLEN];
57			static char *mbuf;
58
59			struct Message join_msgtab = {
60			"JOIN", 0, 0, 2, 0, MFLG_SLOW, 0,
61			{m_unregistered, m_join, ms_join, m_ignore, m_join, m_ignore}
62			};
63
64			#ifndef STATIC_MODULES
65			void
66			_modinit(void)
67			{
68			mod_add_cmd(&join_msgtab);
69			}
70
71			void
72			_moddeinit(void)
73			{
74			mod_del_cmd(&join_msgtab);
75			}
76
77	knight	31	const char *_version = "$Revision$";
78	adx	30	#endif
79
80	michael	488	/* last0() stolen from ircu */
81			static char *
82			last0(struct Client client_p, struct Client source_p, char *chanlist)
83			{
84			char *p;
85			int join0 = 0;
86
87			for (p = chanlist; p; ++p) / find last "JOIN 0" */
88			{
89			if (p == '0' && ((p + 1) == ',' \|\| *(p + 1) == '\0'))
90			{
91			if ((*p + 1) == ',')
92			++p;
93
94			chanlist = p + 1;
95			join0 = 1;
96			}
97			else
98			{
99			while (p != ',' && p != '\0') /* skip past channel name */
100			++p;
101
102			if (p == '\0') / hit the end */
103			break;
104			}
105			}
106
107			if (join0)
108			do_join_0(client_p, source_p);
109
110			return chanlist;
111			}
112
113	adx	30	/* m_join()
114			* parv[0] = sender prefix
115			* parv[1] = channel
116			* parv[2] = channel password (key)
117			*/
118			static void
119			m_join(struct Client client_p, struct Client source_p,
120			int parc, char *parv[])
121			{
122	michael	488	char *p = NULL;
123			char *key_list = NULL;
124			char *chan_list = NULL;
125			char *chan = NULL;
126	adx	30	struct Channel *chptr = NULL;
127	michael	488	int i = 0;
128	adx	30	unsigned int flags = 0;
129	michael	488	unsigned int error_reported = 0;
130	adx	30
131			if (*parv[1] == '\0')
132			{
133			sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
134			me.name, source_p->name, "JOIN");
135			return;
136			}
137
138	michael	487	assert(client_p == source_p);
139	adx	30
140	michael	488	key_list = parv[2];
141			chan_list = last0(client_p, source_p, parv[1]);
142	michael	487
143	michael	488	for (chan = strtoken(&p, chan_list, ","); chan;
144			chan = strtoken(&p, NULL, ","))
145	adx	30	{
146	michael	488	char *key = NULL;
147	adx	30
148	michael	488	/* If we have any more keys, take the first for this channel. */
149			if (!EmptyString(key_list) && (key_list = strchr(key = key_list, ',')))
150			*key_list++ = '\0';
151
152			/* Empty keys are the same as no keys. */
153			if (key && *key == '\0')
154			key = NULL;
155
156			if (!IsChanPrefix(*chan) \|\| !check_channel_name(chan))
157			{
158			sendto_one(source_p, form_str(ERR_BADCHANNAME),
159			me.name, source_p->name, chan);
160	adx	30	continue;
161	michael	488	}
162	adx	30
163	michael	488	if (ConfigChannel.disable_local_channels && (*chan == '&'))
164			{
165			sendto_one(source_p, form_str(ERR_NOSUCHCHANNEL),
166			me.name, source_p->name, chan);
167			continue;
168			}
169
170			if (strlen(chan) > LOCAL_CHANNELLEN)
171			{
172			sendto_one(source_p, form_str(ERR_BADCHANNAME),
173			me.name, source_p->name, chan);
174			continue;
175			}
176
177			if (!IsExemptResv(source_p) &&
178			!(IsOper(source_p) && ConfigFileEntry.oper_pass_resv) &&
179			(!hash_find_resv(chan) == ConfigChannel.restrict_channels))
180			{
181			sendto_one(source_p, form_str(ERR_BADCHANNAME),
182			me.name, source_p->name, chan);
183			sendto_realops_flags(UMODE_SPY, L_ALL,
184			"User %s (%s@%s) is attempting to join locally juped channel %s",
185			source_p->name, source_p->username, source_p->host, chan);
186			continue;
187			}
188
189			if ((dlink_list_length(&source_p->channel) >= ConfigChannel.max_chans_per_user) &&
190			(!IsOper(source_p) \|\| (dlink_list_length(&source_p->channel) >=
191			ConfigChannel.max_chans_per_user * 3)))
192			{
193			if (!error_reported++)
194			sendto_one(source_p, form_str(ERR_TOOMANYCHANNELS),
195			me.name, source_p->name, chan);
196			continue;
197			}
198
199			if ((chptr = hash_find_channel(chan)) != NULL)
200			{
201			if (IsMember(source_p, chptr))
202			continue;
203
204			if (splitmode && !IsOper(source_p) && (*chan != '&') &&
205			ConfigChannel.no_join_on_split)
206			{
207			sendto_one(source_p, form_str(ERR_UNAVAILRESOURCE),
208			me.name, source_p->name, chan);
209			continue;
210			}
211
212			/*
213			* This should never be the case unless there is some sort of
214			* persistant channels.
215			*/
216			if (dlink_list_length(&chptr->members) == 0)
217			flags = CHFL_CHANOP;
218			else
219			flags = 0;
220			}
221			else
222			{
223			if (splitmode && !IsOper(source_p) && (*chan != '&') &&
224			(ConfigChannel.no_create_on_split \|\| ConfigChannel.no_join_on_split))
225			{
226			sendto_one(source_p, form_str(ERR_UNAVAILRESOURCE),
227			me.name, source_p->name, chan);
228			continue;
229			}
230
231			flags = CHFL_CHANOP;
232
233			if ((chptr = get_or_create_channel(source_p, chan, NULL)) == NULL)
234			{
235			sendto_one(source_p, form_str(ERR_UNAVAILRESOURCE),
236			me.name, source_p->name, chan);
237			continue;
238			}
239			}
240
241	adx	30	if (!IsOper(source_p))
242			check_spambot_warning(source_p, chptr->chname);
243
244			/*
245			* can_join checks for +i key, bans.
246			*/
247			if ((i = can_join(source_p, chptr, key)))
248			{
249	michael	488	sendto_one(source_p, form_str(i), me.name,
250			source_p->name, chptr->chname);
251	adx	30	continue;
252			}
253
254			add_user_to_channel(chptr, source_p, flags, YES);
255
256			/*
257	michael	488	* Set timestamp if appropriate, and propagate
258			*/
259	adx	30	if (flags & CHFL_CHANOP)
260			{
261			chptr->channelts = CurrentTime;
262			chptr->mode.mode \|= MODE_TOPICLIMIT;
263			chptr->mode.mode \|= MODE_NOPRIVMSGS;
264
265			sendto_server(client_p, source_p, chptr, CAP_TS6, NOCAPS, LL_ICLIENT,
266			":%s SJOIN %lu %s +nt :@%s",
267			me.id, (unsigned long)chptr->channelts,
268			chptr->chname, source_p->id);
269			sendto_server(client_p, source_p, chptr, NOCAPS, CAP_TS6, LL_ICLIENT,
270			":%s SJOIN %lu %s +nt :@%s",
271			me.name, (unsigned long)chptr->channelts,
272			chptr->chname, parv[0]);
273			/*
274			* notify all other users on the new channel
275			*/
276			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN :%s",
277			source_p->name, source_p->username,
278			source_p->host, chptr->chname);
279	michael	488	sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s +nt",
280	adx	30	me.name, chptr->chname);
281			}
282			else
283			{
284			sendto_server(client_p, source_p, chptr, CAP_TS6, NOCAPS, LL_ICLIENT,
285			":%s JOIN %lu %s +",
286			source_p->id, (unsigned long)chptr->channelts,
287			chptr->chname);
288			sendto_server(client_p, source_p, chptr, NOCAPS, CAP_TS6, LL_ICLIENT,
289			":%s SJOIN %lu %s + :%s",
290			me.name, (unsigned long)chptr->channelts,
291			chptr->chname, source_p->name);
292
293			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN :%s",
294			source_p->name, source_p->username,
295			source_p->host, chptr->chname);
296			}
297
298			del_invite(chptr, source_p);
299
300			if (chptr->topic != NULL)
301			{
302			sendto_one(source_p, form_str(RPL_TOPIC), me.name,
303			source_p->name, chptr->chname, chptr->topic);
304
305			sendto_one(source_p, form_str(RPL_TOPICWHOTIME),
306			me.name, source_p->name, chptr->chname,
307			chptr->topic_info, chptr->topic_time);
308			}
309
310			channel_member_names(source_p, chptr, 1);
311
312	michael	487	source_p->localClient->last_join_time = CurrentTime;
313	adx	30	}
314			}
315
316			/* ms_join()
317			*
318			* inputs - parv[0] = uid
319			* parv[1] = ts
320			* parv[2] = channel name
321			* parv[3] = modes
322			* output - none
323			* side effects - handles remote JOIN's sent by servers. In TSora
324			* remote clients are joined using SJOIN, hence a
325			* JOIN sent by a server on behalf of a client is an error.
326			* here, the initial code is in to take an extra parameter
327			* and use it for the TimeStamp on a new channel.
328			*/
329			static void
330			ms_join(struct Client client_p, struct Client source_p,
331			int parc, char *parv[])
332			{
333			struct Channel *chptr;
334			time_t newts;
335			time_t oldts;
336			static struct Mode mode, *oldmode;
337			int args = 0;
338			int keep_our_modes = 1;
339			int keep_new_modes = 1;
340			int isnew;
341			char *s;
342			const char *servername;
343
344			if ((parv[1][0] == '0') && (parv[1][1] == '\0') && parc == 2)
345			{
346			do_join_0(client_p, source_p);
347			return;
348			}
349
350			if (parc < 4)
351			return;
352
353			if (*parv[2] == '&')
354			return;
355
356			if (!check_channel_name(parv[2]))
357			return;
358
359			mbuf = modebuf;
360			mode.mode = mode.limit = 0;
361			mode.key[0] = '\0';
362
363			s = parv[3];
364			while (*s)
365			{
366			switch (*(s++))
367			{
368			case 't':
369			mode.mode \|= MODE_TOPICLIMIT;
370			break;
371			case 'n':
372			mode.mode \|= MODE_NOPRIVMSGS;
373			break;
374			case 's':
375			mode.mode \|= MODE_SECRET;
376			break;
377			case 'm':
378			mode.mode \|= MODE_MODERATED;
379			break;
380			case 'i':
381			mode.mode \|= MODE_INVITEONLY;
382			break;
383			case 'p':
384			mode.mode \|= MODE_PRIVATE;
385			break;
386			case 'k':
387			if (parc < 5+args)
388			return;
389
390			strlcpy(mode.key, parv[4 + args], sizeof(mode.key));
391			args++;
392			break;
393			case 'l':
394			if (parc < 5+args)
395			return;
396
397			mode.limit = atoi(parv[4 + args]);
398			args++;
399			break;
400			}
401			}
402
403			if ((chptr = get_or_create_channel(source_p, parv[2], &isnew)) == NULL)
404			return; /* channel name too long? */
405
406			newts = atol(parv[1]);
407			oldts = chptr->channelts;
408			oldmode = &chptr->mode;
409
410			if (ConfigFileEntry.ignore_bogus_ts)
411			{
412			if (newts < 800000000)
413			{
414			sendto_realops_flags(UMODE_DEBUG, L_ALL,
415			"*** Bogus TS %lu on %s ignored from %s",
416			(unsigned long)newts, chptr->chname,
417			client_p->name);
418
419			newts = (oldts == 0) ? 0 : 800000000;
420			}
421			}
422			else
423			{
424			if (!newts && !isnew && oldts)
425			{
426			sendto_channel_local(ALL_MEMBERS, NO, chptr,
427			":%s NOTICE %s :*** Notice -- TS for %s changed from %lu to 0",
428			me.name, chptr->chname, chptr->chname, (unsigned long)oldts);
429			sendto_realops_flags(UMODE_ALL, L_ALL,
430			"Server %s changing TS on %s from %lu to 0",
431			source_p->name, chptr->chname, (unsigned long)oldts);
432			}
433			}
434
435			if (isnew)
436			chptr->channelts = newts;
437			else if (newts == 0 \|\| oldts == 0)
438			chptr->channelts = 0;
439			else if (newts == oldts)
440			;
441			else if (newts < oldts)
442			{
443			keep_our_modes = NO;
444			chptr->channelts = newts;
445			}
446			else
447			keep_new_modes = NO;
448
449			if (!keep_new_modes)
450			mode = *oldmode;
451			else if (keep_our_modes)
452			{
453			mode.mode \|= oldmode->mode;
454			if (oldmode->limit > mode.limit)
455			mode.limit = oldmode->limit;
456			if (strcmp(mode.key, oldmode->key) < 0)
457			strcpy(mode.key, oldmode->key);
458			}
459
460			set_final_mode(&mode, oldmode);
461			chptr->mode = mode;
462
463			/* Lost the TS, other side wins, so remove modes on this side */
464			if (!keep_our_modes)
465			{
466			remove_our_modes(chptr, source_p);
467			sendto_channel_local(ALL_MEMBERS, NO, chptr,
468			":%s NOTICE %s :*** Notice -- TS for %s changed from %lu to %lu",
469			me.name, chptr->chname, chptr->chname,
470			(unsigned long)oldts, (unsigned long)newts);
471			}
472
473			if (*modebuf != '\0')
474			{
475			servername = (ConfigServerHide.hide_servers \|\| IsHidden(source_p)) ?
476			me.name : source_p->name;
477
478			/* This _SHOULD_ be to ALL_MEMBERS
479			* It contains only +imnpstlk, etc */
480			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s %s",
481			servername, chptr->chname, modebuf, parabuf);
482			}
483
484			if (!IsMember(source_p, chptr))
485			{
486			add_user_to_channel(chptr, source_p, 0, YES);
487			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN :%s",
488			source_p->name, source_p->username,
489			source_p->host, chptr->chname);
490			}
491
492			sendto_server(client_p, NULL, chptr, CAP_TS6, NOCAPS, NOFLAGS,
493			":%s JOIN %lu %s +",
494			ID(source_p), (unsigned long)chptr->channelts, chptr->chname);
495			sendto_server(client_p, NULL, chptr, NOCAPS, CAP_TS6, NOFLAGS,
496			":%s SJOIN %lu %s + :%s",
497			source_p->servptr->name, (unsigned long)chptr->channelts,
498			chptr->chname, source_p->name);
499			}
500
501			/* do_join_0()
502			*
503			* inputs - pointer to client doing join 0
504			* output - NONE
505			* side effects - Use has decided to join 0. This is legacy
506			* from the days when channels were numbers not names. sigh
507			* There is a bunch of evilness necessary here due to
508			* anti spambot code.
509			*/
510			static void
511			do_join_0(struct Client client_p, struct Client source_p)
512			{
513			struct Channel *chptr = NULL;
514	michael	488	dlink_node ptr = NULL, ptr_next = NULL;
515	adx	30
516	michael	488	if (source_p->channel.head && MyConnect(source_p) && !IsOper(source_p))
517	adx	30	check_spambot_warning(source_p, NULL);
518
519			DLINK_FOREACH_SAFE(ptr, ptr_next, source_p->channel.head)
520			{
521			chptr = ((struct Membership *)ptr->data)->chptr;
522
523	michael	488	sendto_server(client_p, NULL, chptr, CAP_TS6, NOCAPS, NOFLAGS,
524			":%s PART %s", ID(source_p), chptr->chname);
525			sendto_server(client_p, NULL, chptr, NOCAPS, CAP_TS6, NOFLAGS,
526			":%s PART %s", source_p->name, chptr->chname);
527			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s PART %s",
528			source_p->name, source_p->username,
529			source_p->host, chptr->chname);
530	adx	30
531	michael	488	remove_user_from_channel(ptr->data);
532	adx	30	}
533			}
534
535			/* set_final_mode()
536			*
537			* inputs - pointer to mode to setup
538			* - pointer to old mode
539			* output - NONE
540			* side effects -
541			*/
542			static const struct mode_letter
543			{
544			unsigned int mode;
545			unsigned char letter;
546			} flags[] = {
547			{ MODE_NOPRIVMSGS, 'n' },
548			{ MODE_TOPICLIMIT, 't' },
549			{ MODE_SECRET, 's' },
550			{ MODE_MODERATED, 'm' },
551			{ MODE_INVITEONLY, 'i' },
552			{ MODE_PRIVATE, 'p' },
553			{ 0, '\0' }
554			};
555
556			static void
557			set_final_mode(struct Mode mode, struct Mode oldmode)
558			{
559			char *pbuf = parabuf;
560			int what = 0;
561			int len;
562			int i;
563
564			for (i = 0; flags[i].letter; i++)
565			{
566			if ((flags[i].mode & mode->mode) &&
567			!(flags[i].mode & oldmode->mode))
568			{
569			if (what != 1)
570			{
571			*mbuf++ = '+';
572			what = 1;
573			}
574			*mbuf++ = flags[i].letter;
575			}
576			}
577
578			for (i = 0; flags[i].letter; i++)
579			{
580			if ((flags[i].mode & oldmode->mode) &&
581			!(flags[i].mode & mode->mode))
582			{
583			if (what != -1)
584			{
585			*mbuf++ = '-';
586			what = -1;
587			}
588			*mbuf++ = flags[i].letter;
589			}
590			}
591
592			if (oldmode->limit != 0 && mode->limit == 0)
593			{
594			if (what != -1)
595			{
596			*mbuf++ = '-';
597			what = -1;
598			}
599			*mbuf++ = 'l';
600			}
601
602			if (oldmode->key[0] && !mode->key[0])
603			{
604			if (what != -1)
605			{
606			*mbuf++ = '-';
607			what = -1;
608			}
609			*mbuf++ = 'k';
610			len = ircsprintf(pbuf, "%s ", oldmode->key);
611			pbuf += len;
612			}
613
614			if (mode->limit != 0 && oldmode->limit != mode->limit)
615			{
616			if (what != 1)
617			{
618			*mbuf++ = '+';
619			what = 1;
620			}
621			*mbuf++ = 'l';
622			len = ircsprintf(pbuf, "%d ", mode->limit);
623			pbuf += len;
624			}
625
626			if (mode->key[0] && strcmp(oldmode->key, mode->key))
627			{
628			if (what != 1)
629			{
630			*mbuf++ = '+';
631			what = 1;
632			}
633			*mbuf++ = 'k';
634			len = ircsprintf(pbuf, "%s ", mode->key);
635			pbuf += len;
636			}
637			*mbuf = '\0';
638			}
639
640			/* remove_our_modes()
641			*
642			* inputs - pointer to channel to remove modes from
643			* - client pointer
644			* output - NONE
645			* side effects - Go through the local members, remove all their
646			* chanop modes etc., this side lost the TS.
647			*/
648			static void
649			remove_our_modes(struct Channel chptr, struct Client source_p)
650			{
651			remove_a_mode(chptr, source_p, CHFL_CHANOP, 'o');
652			#ifdef HALFOPS
653			remove_a_mode(chptr, source_p, CHFL_HALFOP, 'h');
654			#endif
655			remove_a_mode(chptr, source_p, CHFL_VOICE, 'v');
656			}
657
658			/* remove_a_mode()
659			*
660			* inputs -
661			* output - NONE
662			* side effects - remove ONE mode from a channel
663			*/
664			static void
665			remove_a_mode(struct Channel chptr, struct Client source_p,
666			int mask, char flag)
667			{
668			dlink_node *ptr;
669			struct Membership *ms;
670			char lmodebuf[MODEBUFLEN];
671			const char *lpara[MAXMODEPARAMS];
672			int count = 0;
673			int lcount;
674
675			mbuf = lmodebuf;
676			*mbuf++ = '-';
677
678			for (lcount = 0; lcount < MAXMODEPARAMS; lcount++)
679			lpara[lcount] = "";
680			sendbuf[0] = '\0';
681
682			DLINK_FOREACH(ptr, chptr->members.head)
683			{
684			ms = ptr->data;
685
686			if ((ms->flags & mask) == 0)
687			continue;
688
689			ms->flags &= ~mask;
690
691			lpara[count++] = ms->client_p->name;
692
693			*mbuf++ = flag;
694
695			if (count >= MAXMODEPARAMS)
696			{
697			for (lcount = 0; lcount < MAXMODEPARAMS; lcount++)
698			{
699			if (*lpara[lcount] == '\0')
700			break;
701
702			strlcat(sendbuf, " ", sizeof(sendbuf));
703			strlcat(sendbuf, lpara[lcount], sizeof(sendbuf));
704			lpara[lcount] = "";
705			}
706
707			*mbuf = '\0';
708			sendto_channel_local(ALL_MEMBERS, NO, chptr,
709			":%s MODE %s %s%s",
710			(IsHidden(source_p) \|\|
711			ConfigServerHide.hide_servers) ?
712			me.name : source_p->name,
713			chptr->chname, lmodebuf, sendbuf);
714			mbuf = lmodebuf;
715			*mbuf++ = '-';
716			count = 0;
717			sendbuf[0] = '\0';
718			}
719			}
720
721			if (count != 0)
722			{
723			*mbuf = '\0';
724			for (lcount = 0; lcount < MAXMODEPARAMS; lcount++)
725			{
726			if (*lpara[lcount] == '\0')
727			break;
728
729			strlcat(sendbuf, " ", sizeof(sendbuf));
730			strlcat(sendbuf, lpara[lcount], sizeof(sendbuf));
731			}
732			sendto_channel_local(ALL_MEMBERS, NO, chptr,
733			":%s MODE %s %s%s",
734			(IsHidden(source_p) \|\| ConfigServerHide.hide_servers) ?
735			me.name : source_p->name,
736			chptr->chname, lmodebuf, sendbuf);
737			}
738			}
739