modules/core/m_sjoin.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  m_sjoin.c: Joins a user to 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 "list.h"
#include "handlers.h"
#include "channel.h"
#include "channel_mode.h"
#include "client.h"
#include "hash.h"
#include "irc_string.h"
#include "sprintf_irc.h"
#include "ircd.h"
#include "numeric.h"
#include "send.h"
#include "common.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
#include "s_serv.h"
#include "s_conf.h"

static void ms_sjoin(struct Client *, struct Client *, int, char *[]);

struct Message sjoin_msgtab = {
  "SJOIN", 0, 0, 0, 0, MFLG_SLOW, 0,
  {m_unregistered, m_ignore, ms_sjoin, m_ignore, m_ignore, m_ignore}
};

void
_modinit(void)
{
  mod_add_cmd(&sjoin_msgtab);
}

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

const char *_version = "$Revision$";

static char modebuf[MODEBUFLEN];
static char parabuf[MODEBUFLEN];
static char sendbuf[MODEBUFLEN];
static const char *para[MAXMODEPARAMS];
static char *mbuf;
static int pargs;

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 void remove_ban_list(struct Channel *, struct Client *, dlink_list *, char, int);


/* ms_sjoin()
 *
 * parv[0] - sender
 * parv[1] - TS
 * parv[2] - channel
 * parv[3] - modes + n arguments (key and/or limit)
 * parv[4+n] - flags+nick list (all in one parameter)
 *
 * process a SJOIN, taking the TS's into account to either ignore the
 * incoming modes or undo the existing ones or merge them, and JOIN
 * all the specified users while sending JOIN/MODEs to local clients
 */
static void
ms_sjoin(struct Client *client_p, struct Client *source_p,
         int parc, char *parv[])
{
  struct Channel *chptr = NULL;
  struct Client  *target_p = NULL;
  time_t         newts;
  time_t         oldts;
  time_t         tstosend;
  struct Mode mode, *oldmode;
  int            args = 0;
  char           keep_our_modes = YES;
  char           keep_new_modes = YES;
  char           have_many_nicks = NO;
  int            lcount;
  char           nick_prefix[4];
  char           uid_prefix[4];
  char           *np, *up;
  int            len_nick = 0;
  int            len_uid = 0;
  int            isnew = 0;
  int            buflen = 0;
  int            slen;
  unsigned       int fl;
  char           *s;
  char           *sptr;
  char nick_buf[IRCD_BUFSIZE]; /* buffer for modes and prefix */
  char uid_buf[IRCD_BUFSIZE];  /* buffer for modes/prefixes for CAP_TS6 servers */
  char           *nick_ptr, *uid_ptr;      /* pointers used for making the two mode/prefix buffers */
  char           *p; /* pointer used making sjbuf */
  dlink_node     *m;
  const char *servername = (ConfigServerHide.hide_servers || IsHidden(source_p)) ?
                            me.name : source_p->name;  

  if (IsClient(source_p) || parc < 5)
    return;

  /* SJOIN's for local channels can't happen. */
  if (*parv[2] != '#')
    return;

  if (!check_channel_name(parv[2], 0))
  {
    sendto_realops_flags(UMODE_DEBUG, L_ALL,
                         "*** Too long or invalid channel name from %s: %s",
                         client_p->name, parv[2]);
    return;
  }

  modebuf[0] = '\0';
  mbuf = modebuf;
  pargs = 0;
  newts = atol(parv[1]);

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

  for (s = parv[3]; *s; ++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 'O':
        mode.mode |= MODE_OPERONLY;
        break;
      case 'S':
        mode.mode |= MODE_SSLONLY;
        break;
      case 'k':
        strlcpy(mode.key, parv[4 + args], sizeof(mode.key));
        args++;

        if (parc < 5 + args)
          return;
        break;
      case 'l':
        mode.limit = atoi(parv[4 + args]);
        args++;

        if (parc < 5 + args)
          return;
        break;
    }
  }

  if ((chptr = hash_find_channel(parv[2])) == NULL)
  {
    isnew = 1;
    chptr = make_channel(parv[2]);
  }

  parabuf[0] = '\0';
  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 = tstosend = newts;
  else if (newts == 0 || oldts == 0)
    chptr->channelts = tstosend = 0;
  else if (newts == oldts)
    tstosend = oldts;
  else if (newts < oldts)
  {
    keep_our_modes = NO;
    chptr->channelts = tstosend = newts;
  }
  else
  {
    keep_new_modes = NO;
    tstosend = oldts;
  }

  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);

    if (chptr->topic)
    {
      set_channel_topic(chptr, NULL, NULL, 0);
      chptr->topic_time = 0;
      sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s TOPIC %s :",
                           (IsHidden(source_p) ||
                           ConfigServerHide.hide_servers) ?
                           me.name : source_p->name, chptr->chname);
    }

    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')
  {
    /* 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 (parv[3][0] != '0' && keep_new_modes)
  {
    channel_modes(chptr, source_p, modebuf, parabuf);
  }
  else
  {
    modebuf[0] = '0';
    modebuf[1] = '\0';
  }

  buflen = ircsprintf(nick_buf, ":%s SJOIN %lu %s %s %s:",
                      source_p->name, (unsigned long)tstosend,
                      chptr->chname, modebuf, parabuf);
  nick_ptr = nick_buf + buflen;

  buflen = ircsprintf(uid_buf, ":%s SJOIN %lu %s %s %s:",
                      ID(source_p), (unsigned long)tstosend,
                      chptr->chname, modebuf, parabuf);
  uid_ptr = uid_buf + buflen;

  /* check we can fit a nick on the end, as well as \r\n and a prefix "
   * @%+", and a space.
   */
  if (buflen >= (IRCD_BUFSIZE - IRCD_MAX(NICKLEN, IDLEN) - 2 - 3 - 1))
  {
    sendto_realops_flags(UMODE_ALL, L_ALL,
                         "Long SJOIN from server: %s(via %s) (ignored)",
                         source_p->name, client_p->name);
    return;
  }

  mbuf = modebuf;
  sendbuf[0] = '\0';
  pargs = 0;

  *mbuf++ = '+';

  s = parv[args + 4];
  while (*s == ' ')
    s++;
  if ((p = strchr(s, ' ')) != NULL)
  {
    *p++ = '\0';
    while (*p == ' ')
      p++;
    have_many_nicks = *p;
  }

  while (*s)
  {
    int valid_mode = YES;
    fl = 0;

    do
    {
      switch (*s)
      {
      case '@':
        fl |= CHFL_CHANOP;
        s++;
        break;
#ifdef HALFOPS
      case '%':
        fl |= CHFL_HALFOP;
        s++;
        break;
#endif
      case '+':
        fl |= CHFL_VOICE;
        s++;
        break;
      default:
        valid_mode = NO;
        break;
      }
    } while (valid_mode);

    target_p = find_chasing(client_p, source_p, s, NULL);

    /*
     * if the client doesnt exist, or if its fake direction/server, skip.
     * we cannot send ERR_NOSUCHNICK here because if its a UID, we cannot
     * lookup the nick, and its better to never send the numeric than only
     * sometimes.
     */
    if (target_p == NULL ||
        target_p->from != client_p ||
        !IsClient(target_p))
    {
      goto nextnick;
    }

    len_nick = strlen(target_p->name);
    len_uid = strlen(ID(target_p));

    np = nick_prefix;
    up = uid_prefix;

    if (keep_new_modes)
    {
      if (fl & CHFL_CHANOP)
      {
        *np++ = '@';
        *up++  = '@';
        len_nick++;
        len_uid++;
      }
#ifdef HALFOPS
      if (fl & CHFL_HALFOP)
      {
        *np++ = '%';
        *up++  = '%';
        len_nick++;
        len_uid++;
      }
#endif
      if (fl & CHFL_VOICE)
      {
        *np++ = '+';
        *up++  = '+';
        len_nick++;
        len_uid++;
      }
    }
    else
    {
      if (fl & (CHFL_CHANOP|CHFL_HALFOP))
        fl = CHFL_DEOPPED;
      else
        fl = 0;
    }
    *np = *up = '\0';

    if ((nick_ptr - nick_buf + len_nick) > (IRCD_BUFSIZE  - 2))
    {
      sendto_server(client_p, chptr, 0, CAP_TS6, "%s", nick_buf);
      
      buflen = ircsprintf(nick_buf, ":%s SJOIN %lu %s %s %s:",
                          source_p->name, (unsigned long)tstosend,
                          chptr->chname, modebuf, parabuf);
      nick_ptr = nick_buf + buflen;
    }

    nick_ptr += ircsprintf(nick_ptr, "%s%s ", nick_prefix, target_p->name);
    
    if ((uid_ptr - uid_buf + len_uid) > (IRCD_BUFSIZE - 2))
    {
      sendto_server(client_p, chptr, CAP_TS6, 0, "%s", uid_buf);
      
      buflen = ircsprintf(uid_buf, ":%s SJOIN %lu %s %s %s:",
                          ID(source_p), (unsigned long)tstosend,
                          chptr->chname, modebuf, parabuf);
      uid_ptr = uid_buf + buflen;
    }

    uid_ptr  += ircsprintf(uid_ptr,  "%s%s ", uid_prefix, ID(target_p));
        
    if (!IsMember(target_p, chptr))
    {
      add_user_to_channel(chptr, target_p, fl, !have_many_nicks);
      sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN :%s",
                           target_p->name, target_p->username,
                           target_p->host, chptr->chname);
    }

    if (fl & CHFL_CHANOP)
    {
      *mbuf++ = 'o';
      para[pargs++] = target_p->name;

      if (pargs >= MAXMODEPARAMS)
      {
        /*
         * Ok, the code is now going to "walk" through
         * sendbuf, filling in para strings. So, I will use sptr
         * to point into the sendbuf.
         * Notice, that ircsprintf() returns the number of chars
         * successfully inserted into string.
         * - Dianora
         */

        sptr = sendbuf;
        *mbuf = '\0';
        for(lcount = 0; lcount < MAXMODEPARAMS; lcount++)
        {
          slen = ircsprintf(sptr, " %s", para[lcount]); /* see? */
          sptr += slen;                                 /* ready for next */
        }
        sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s%s",
                            servername, chptr->chname, modebuf, sendbuf);
        mbuf = modebuf;
        *mbuf++ = '+';

        sendbuf[0] = '\0';
        pargs = 0;
      }
    }
#ifdef HALFOPS
    if (fl & CHFL_HALFOP)
    {
      *mbuf++ = 'h';
      para[pargs++] = target_p->name;

      if (pargs >= MAXMODEPARAMS)
      {
        sptr = sendbuf;
        *mbuf = '\0';
        for(lcount = 0; lcount < MAXMODEPARAMS; lcount++)
        {
          slen = ircsprintf(sptr, " %s", para[lcount]);
          sptr += slen;
        }
        sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s%s",
                             servername, chptr->chname, modebuf, sendbuf);

        mbuf = modebuf;
        *mbuf++ = '+';

        sendbuf[0] = '\0';
        pargs = 0;
      }
    }
#endif
    if (fl & CHFL_VOICE)
    {
      *mbuf++ = 'v';
      para[pargs++] = target_p->name;

      if (pargs >= MAXMODEPARAMS)
      {
        sptr = sendbuf;
        *mbuf = '\0';
        for (lcount = 0; lcount < MAXMODEPARAMS; lcount++)
        {
          slen = ircsprintf(sptr, " %s", para[lcount]);
          sptr += slen;
        }
        sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s%s",
                             servername, chptr->chname, modebuf, sendbuf);

        mbuf = modebuf;
        *mbuf++ = '+';

        sendbuf[0] = '\0';
        pargs = 0;
      }
    }

  nextnick:
    if ((s = p) == NULL)
      break;
    while (*s == ' ')
      s++;
    if ((p = strchr(s, ' ')) != NULL)
    {
      *p++ = 0;
      while (*p == ' ')
        p++;
    }
  }

  *mbuf = '\0';
  *(nick_ptr - 1) = '\0';
  *(uid_ptr - 1) = '\0';

  /*
   * checking for lcount < MAXMODEPARAMS at this time is wrong
   * since the code has already verified above that pargs < MAXMODEPARAMS
   * checking for para[lcount] != '\0' is also wrong, since
   * there is no place where para[lcount] is set!
   * - Dianora
   */

  if (pargs != 0)
  {
    sptr = sendbuf;

    for (lcount = 0; lcount < pargs; lcount++)
    {
      slen = ircsprintf(sptr, " %s", para[lcount]);
      sptr += slen;
    }

    sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s%s",
                        servername, chptr->chname, modebuf, sendbuf);
  }

  /* If this happens, its the result of a malformed SJOIN
   * a remnant from the old persistent channel code. *sigh*
   * Or it could be the result of a client just leaving
   * and leaving us with a channel formed just as the client parts.
   * - Dianora
   */

  if ((dlink_list_length(&chptr->members) == 0) && isnew)
  {
    destroy_channel(chptr);
    return;
  }

  if (parv[4 + args][0] == '\0')
    return;

  /* relay the SJOIN to other servers */
  DLINK_FOREACH(m, serv_list.head)
  {
    target_p = m->data;

    if (target_p == client_p)
      continue;

    if (IsCapable(target_p, CAP_TS6))
      sendto_one(target_p, "%s", uid_buf);
    else
      sendto_one(target_p, "%s", nick_buf);
  }

  if (HasID(source_p) && !keep_our_modes)
  {
    if (dlink_list_length(&chptr->banlist) > 0)
      remove_ban_list(chptr, client_p, &chptr->banlist,
                      'b', NOCAPS);

    if (dlink_list_length(&chptr->exceptlist) > 0)
      remove_ban_list(chptr, client_p, &chptr->exceptlist,
                      'e', CAP_EX);

    if (dlink_list_length(&chptr->invexlist) > 0)
      remove_ban_list(chptr, client_p, &chptr->invexlist,
                      'I', CAP_IE);
    clear_ban_cache(chptr);
  }               
}

/* set_final_mode
 *
 * inputs       - channel mode
 *              - old channel mode
 * output       - NONE
 * side effects - walk through all the channel modes turning off modes
 *                that were on in oldmode but aren't on in mode.
 *                Then walk through turning on modes that are on in mode
 *                but were not set in oldmode.
 */

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' },
  { MODE_OPERONLY,   'O' },
  { MODE_SSLONLY,    'S' },
  { 0, '\0' }
};

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

  *mbuf++ = '-';

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

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

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

  if (*(mbuf-1) == '-')
    *(mbuf-1) = '+';
  else
    *mbuf++ = '+';

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

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

  if (mode->key[0] && strcmp(oldmode->key, mode->key))
  {
    *mbuf++ = 'k';
    len = ircsprintf(pbuf, "%s ", mode->key);
    pbuf += len;
    pargs++;
  }
  if (*(mbuf-1) == '+')
    *(mbuf-1) = '\0';
  else
    *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       - pointer to channel
 *              - server or client removing the mode
 *              - mask o/h/v mask to be removed
 *              - flag o/h/v to be removed
 * output       - NONE
 * side effects - remove ONE mode from all members of 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];
  char *sp=sendbuf;
  const char *lpara[MAXMODEPARAMS];
  int count = 0;
  int i;
  int l;

  mbuf = lmodebuf;
  *mbuf++ = '-';
  *sp = '\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(i = 0; i < MAXMODEPARAMS; i++)
      {
        l = ircsprintf(sp, " %s", lpara[i]);
        sp += l;
      }

      *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;
      sp = sendbuf;
      *sp = '\0';
    }
  }

  if (count != 0)
  {
    *mbuf = '\0';
    for(i = 0; i < count; i++)
    {
      l = ircsprintf(sp, " %s", lpara[i]);
      sp += l;
    }
    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);
  }
}

/* remove_ban_list()
 *
 * inputs       - channel, source, list to remove, char of mode, caps required
 * outputs      - none
 * side effects - given ban list is removed, modes are sent to local clients and
 *                non-ts6 servers linked through another uplink other than source_p
 */
static void
remove_ban_list(struct Channel *chptr, struct Client *source_p,
                dlink_list *list, char c, int cap)
{
  char lmodebuf[MODEBUFLEN];
  char lparabuf[IRCD_BUFSIZE];
  struct Ban *banptr = NULL;
  dlink_node *ptr = NULL;
  dlink_node *next_ptr = NULL;
  char *pbuf = NULL;
  int count = 0;      
  int cur_len, mlen, plen;

  pbuf = lparabuf;
  
  cur_len = mlen = ircsprintf(lmodebuf, ":%s MODE %s -",
                              source_p->name, chptr->chname);
  mbuf = lmodebuf + mlen;

  DLINK_FOREACH_SAFE(ptr, next_ptr, list->head)
  {
    banptr = ptr->data;

    plen = banptr->len + 4;  /* another +b and "!@ " */
    if (count >= MAXMODEPARAMS ||
        (cur_len + 1 /* space between */ + (plen - 1)) > IRCD_BUFSIZE - 2)
    {
      /* NUL-terminate and remove trailing space */
      *mbuf = *(pbuf - 1) = '\0';
      sendto_channel_local(ALL_MEMBERS, NO, chptr, "%s %s",
               lmodebuf, lparabuf);
      sendto_server(source_p, chptr, cap, CAP_TS6,
                    "%s %s", lmodebuf, lparabuf);

      cur_len = mlen;
      mbuf = lmodebuf + mlen;
      pbuf = lparabuf;
      count = 0;
    }     

    *mbuf++ = c;
    cur_len += plen;
    pbuf += ircsprintf(pbuf, "%s!%s@%s ", banptr->name, banptr->username,
                       banptr->host);
    ++count;

    remove_ban(banptr, list);
  }

  *mbuf = *(pbuf - 1) = '\0';
  sendto_channel_local(ALL_MEMBERS, NO, chptr, "%s %s", lmodebuf, lparabuf);
  sendto_server(source_p, chptr, cap, CAP_TS6,
                "%s %s", lmodebuf, lparabuf);
}
Revision:	1155
Committed:	Tue Aug 9 20:27:45 2011 UTC (14 years, 11 months ago) by michael
Content type:	text/x-csrc
Original Path:	*ircd-hybrid/modules/core/m_sjoin.c*
File size:	21303 byte(s)
Log Message:	- recreate "trunk"
#	User	Rev	Content
1	adx	30	/*
2			* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3			* m_sjoin.c: Joins a user to 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	michael	1011	#include "list.h"
27	adx	30	#include "handlers.h"
28			#include "channel.h"
29			#include "channel_mode.h"
30			#include "client.h"
31			#include "hash.h"
32			#include "irc_string.h"
33			#include "sprintf_irc.h"
34			#include "ircd.h"
35			#include "numeric.h"
36			#include "send.h"
37			#include "common.h"
38			#include "msg.h"
39			#include "parse.h"
40			#include "modules.h"
41			#include "s_serv.h"
42			#include "s_conf.h"
43
44			static void ms_sjoin(struct Client , struct Client , int, char *[]);
45
46			struct Message sjoin_msgtab = {
47			"SJOIN", 0, 0, 0, 0, MFLG_SLOW, 0,
48			{m_unregistered, m_ignore, ms_sjoin, m_ignore, m_ignore, m_ignore}
49			};
50
51			void
52			_modinit(void)
53			{
54			mod_add_cmd(&sjoin_msgtab);
55			}
56
57			void
58			_moddeinit(void)
59			{
60			mod_del_cmd(&sjoin_msgtab);
61			}
62
63	knight	31	const char *_version = "$Revision$";
64	adx	30
65			static char modebuf[MODEBUFLEN];
66			static char parabuf[MODEBUFLEN];
67			static char sendbuf[MODEBUFLEN];
68			static const char *para[MAXMODEPARAMS];
69			static char *mbuf;
70			static int pargs;
71
72			static void set_final_mode(struct Mode , struct Mode );
73			static void remove_our_modes(struct Channel , struct Client );
74			static void remove_a_mode(struct Channel , struct Client , int, char);
75			static void remove_ban_list(struct Channel , struct Client , dlink_list *, char, int);
76
77	michael	885
78	adx	30	/* ms_sjoin()
79			*
80			* parv[0] - sender
81			* parv[1] - TS
82			* parv[2] - channel
83			* parv[3] - modes + n arguments (key and/or limit)
84			* parv[4+n] - flags+nick list (all in one parameter)
85			*
86			* process a SJOIN, taking the TS's into account to either ignore the
87			* incoming modes or undo the existing ones or merge them, and JOIN
88			* all the specified users while sending JOIN/MODEs to local clients
89			*/
90			static void
91			ms_sjoin(struct Client client_p, struct Client source_p,
92			int parc, char *parv[])
93			{
94	michael	632	struct Channel *chptr = NULL;
95			struct Client *target_p = NULL;
96	adx	30	time_t newts;
97			time_t oldts;
98			time_t tstosend;
99	michael	632	struct Mode mode, *oldmode;
100	adx	30	int args = 0;
101			char keep_our_modes = YES;
102			char keep_new_modes = YES;
103			char have_many_nicks = NO;
104			int lcount;
105			char nick_prefix[4];
106			char uid_prefix[4];
107			char np, up;
108			int len_nick = 0;
109			int len_uid = 0;
110	michael	632	int isnew = 0;
111	adx	30	int buflen = 0;
112			int slen;
113			unsigned int fl;
114			char *s;
115			char *sptr;
116			char nick_buf[IRCD_BUFSIZE]; /* buffer for modes and prefix */
117			char uid_buf[IRCD_BUFSIZE]; /* buffer for modes/prefixes for CAP_TS6 servers */
118			char nick_ptr, uid_ptr; /* pointers used for making the two mode/prefix buffers */
119			char p; / pointer used making sjbuf */
120			dlink_node *m;
121			const char *servername = (ConfigServerHide.hide_servers \|\| IsHidden(source_p)) ?
122			me.name : source_p->name;
123
124			if (IsClient(source_p) \|\| parc < 5)
125			return;
126
127			/* SJOIN's for local channels can't happen. */
128			if (*parv[2] != '#')
129			return;
130
131	michael	632	if (!check_channel_name(parv[2], 0))
132			{
133			sendto_realops_flags(UMODE_DEBUG, L_ALL,
134			"*** Too long or invalid channel name from %s: %s",
135			client_p->name, parv[2]);
136	adx	30	return;
137	michael	632	}
138	adx	30
139			modebuf[0] = '\0';
140			mbuf = modebuf;
141			pargs = 0;
142			newts = atol(parv[1]);
143
144			mode.mode = 0;
145			mode.limit = 0;
146			mode.key[0] = '\0';
147
148	michael	632	for (s = parv[3]; *s; ++s)
149	adx	30	{
150	michael	632	switch (*s)
151	adx	30	{
152			case 't':
153			mode.mode \|= MODE_TOPICLIMIT;
154			break;
155			case 'n':
156			mode.mode \|= MODE_NOPRIVMSGS;
157			break;
158			case 's':
159			mode.mode \|= MODE_SECRET;
160			break;
161			case 'm':
162			mode.mode \|= MODE_MODERATED;
163			break;
164			case 'i':
165			mode.mode \|= MODE_INVITEONLY;
166			break;
167			case 'p':
168			mode.mode \|= MODE_PRIVATE;
169			break;
170	michael	1150	case 'O':
171			mode.mode \|= MODE_OPERONLY;
172			break;
173			case 'S':
174			mode.mode \|= MODE_SSLONLY;
175			break;
176	adx	30	case 'k':
177			strlcpy(mode.key, parv[4 + args], sizeof(mode.key));
178			args++;
179	michael	632
180			if (parc < 5 + args)
181	adx	30	return;
182			break;
183			case 'l':
184			mode.limit = atoi(parv[4 + args]);
185			args++;
186	michael	632
187			if (parc < 5 + args)
188	adx	30	return;
189			break;
190			}
191			}
192
193	michael	632	if ((chptr = hash_find_channel(parv[2])) == NULL)
194			{
195			isnew = 1;
196			chptr = make_channel(parv[2]);
197			}
198
199	adx	30	parabuf[0] = '\0';
200	michael	632	oldts = chptr->channelts;
201	adx	30	oldmode = &chptr->mode;
202
203			if (ConfigFileEntry.ignore_bogus_ts)
204			{
205			if (newts < 800000000)
206			{
207			sendto_realops_flags(UMODE_DEBUG, L_ALL,
208			"*** Bogus TS %lu on %s ignored from %s",
209			(unsigned long)newts, chptr->chname,
210			client_p->name);
211
212			newts = (oldts == 0) ? 0 : 800000000;
213			}
214			}
215			else
216			{
217			if (!newts && !isnew && oldts)
218			{
219			sendto_channel_local(ALL_MEMBERS, NO, chptr,
220			":%s NOTICE %s :*** Notice -- TS for %s changed from %lu to 0",
221			me.name, chptr->chname, chptr->chname, (unsigned long)oldts);
222			sendto_realops_flags(UMODE_ALL, L_ALL,
223			"Server %s changing TS on %s from %lu to 0",
224			source_p->name, chptr->chname, (unsigned long)oldts);
225			}
226			}
227
228			if (isnew)
229			chptr->channelts = tstosend = newts;
230			else if (newts == 0 \|\| oldts == 0)
231			chptr->channelts = tstosend = 0;
232			else if (newts == oldts)
233			tstosend = oldts;
234			else if (newts < oldts)
235			{
236			keep_our_modes = NO;
237			chptr->channelts = tstosend = newts;
238			}
239			else
240			{
241			keep_new_modes = NO;
242			tstosend = oldts;
243			}
244
245			if (!keep_new_modes)
246			mode = *oldmode;
247			else if (keep_our_modes)
248			{
249			mode.mode \|= oldmode->mode;
250			if (oldmode->limit > mode.limit)
251			mode.limit = oldmode->limit;
252			if (strcmp(mode.key, oldmode->key) < 0)
253			strcpy(mode.key, oldmode->key);
254			}
255			set_final_mode(&mode, oldmode);
256			chptr->mode = mode;
257
258			/* Lost the TS, other side wins, so remove modes on this side */
259			if (!keep_our_modes)
260			{
261			remove_our_modes(chptr, source_p);
262	michael	873
263			if (chptr->topic)
264			{
265			set_channel_topic(chptr, NULL, NULL, 0);
266			chptr->topic_time = 0;
267			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s TOPIC %s :",
268			(IsHidden(source_p) \|\|
269			ConfigServerHide.hide_servers) ?
270			me.name : source_p->name, chptr->chname);
271			}
272
273	adx	30	sendto_channel_local(ALL_MEMBERS, NO, chptr,
274			":%s NOTICE %s :*** Notice -- TS for %s changed from %lu to %lu",
275			me.name, chptr->chname, chptr->chname,
276			(unsigned long)oldts, (unsigned long)newts);
277			}
278
279			if (*modebuf != '\0')
280			{
281			/* This _SHOULD_ be to ALL_MEMBERS
282			* It contains only +imnpstlk, etc */
283			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s %s",
284			servername, chptr->chname, modebuf, parabuf);
285			}
286
287			if (parv[3][0] != '0' && keep_new_modes)
288			{
289			channel_modes(chptr, source_p, modebuf, parabuf);
290			}
291			else
292			{
293			modebuf[0] = '0';
294			modebuf[1] = '\0';
295			}
296
297			buflen = ircsprintf(nick_buf, ":%s SJOIN %lu %s %s %s:",
298			source_p->name, (unsigned long)tstosend,
299			chptr->chname, modebuf, parabuf);
300			nick_ptr = nick_buf + buflen;
301
302			buflen = ircsprintf(uid_buf, ":%s SJOIN %lu %s %s %s:",
303			ID(source_p), (unsigned long)tstosend,
304			chptr->chname, modebuf, parabuf);
305			uid_ptr = uid_buf + buflen;
306
307			/* check we can fit a nick on the end, as well as \r\n and a prefix "
308			* @%+", and a space.
309			*/
310			if (buflen >= (IRCD_BUFSIZE - IRCD_MAX(NICKLEN, IDLEN) - 2 - 3 - 1))
311			{
312			sendto_realops_flags(UMODE_ALL, L_ALL,
313			"Long SJOIN from server: %s(via %s) (ignored)",
314			source_p->name, client_p->name);
315			return;
316			}
317
318			mbuf = modebuf;
319			sendbuf[0] = '\0';
320			pargs = 0;
321
322			*mbuf++ = '+';
323
324			s = parv[args + 4];
325			while (*s == ' ')
326			s++;
327			if ((p = strchr(s, ' ')) != NULL)
328			{
329			*p++ = '\0';
330			while (*p == ' ')
331			p++;
332			have_many_nicks = *p;
333			}
334
335			while (*s)
336			{
337			int valid_mode = YES;
338			fl = 0;
339
340			do
341			{
342			switch (*s)
343			{
344			case '@':
345			fl \|= CHFL_CHANOP;
346			s++;
347			break;
348			#ifdef HALFOPS
349			case '%':
350			fl \|= CHFL_HALFOP;
351			s++;
352			break;
353			#endif
354			case '+':
355			fl \|= CHFL_VOICE;
356			s++;
357			break;
358			default:
359			valid_mode = NO;
360			break;
361			}
362			} while (valid_mode);
363
364			target_p = find_chasing(client_p, source_p, s, NULL);
365
366			/*
367			* if the client doesnt exist, or if its fake direction/server, skip.
368			* we cannot send ERR_NOSUCHNICK here because if its a UID, we cannot
369			* lookup the nick, and its better to never send the numeric than only
370			* sometimes.
371			*/
372			if (target_p == NULL \|\|
373			target_p->from != client_p \|\|
374			!IsClient(target_p))
375			{
376			goto nextnick;
377			}
378
379			len_nick = strlen(target_p->name);
380			len_uid = strlen(ID(target_p));
381
382			np = nick_prefix;
383			up = uid_prefix;
384
385			if (keep_new_modes)
386			{
387			if (fl & CHFL_CHANOP)
388			{
389			*np++ = '@';
390			*up++ = '@';
391			len_nick++;
392			len_uid++;
393			}
394			#ifdef HALFOPS
395			if (fl & CHFL_HALFOP)
396			{
397			*np++ = '%';
398			*up++ = '%';
399			len_nick++;
400			len_uid++;
401			}
402			#endif
403			if (fl & CHFL_VOICE)
404			{
405			*np++ = '+';
406			*up++ = '+';
407			len_nick++;
408			len_uid++;
409			}
410			}
411			else
412			{
413			if (fl & (CHFL_CHANOP\|CHFL_HALFOP))
414			fl = CHFL_DEOPPED;
415			else
416			fl = 0;
417			}
418			np = up = '\0';
419
420			if ((nick_ptr - nick_buf + len_nick) > (IRCD_BUFSIZE - 2))
421			{
422	michael	885	sendto_server(client_p, chptr, 0, CAP_TS6, "%s", nick_buf);
423	adx	30
424			buflen = ircsprintf(nick_buf, ":%s SJOIN %lu %s %s %s:",
425			source_p->name, (unsigned long)tstosend,
426			chptr->chname, modebuf, parabuf);
427			nick_ptr = nick_buf + buflen;
428			}
429	michael	885
430	adx	30	nick_ptr += ircsprintf(nick_ptr, "%s%s ", nick_prefix, target_p->name);
431
432			if ((uid_ptr - uid_buf + len_uid) > (IRCD_BUFSIZE - 2))
433			{
434	michael	885	sendto_server(client_p, chptr, CAP_TS6, 0, "%s", uid_buf);
435	adx	30
436			buflen = ircsprintf(uid_buf, ":%s SJOIN %lu %s %s %s:",
437			ID(source_p), (unsigned long)tstosend,
438			chptr->chname, modebuf, parabuf);
439			uid_ptr = uid_buf + buflen;
440			}
441
442			uid_ptr += ircsprintf(uid_ptr, "%s%s ", uid_prefix, ID(target_p));
443
444			if (!IsMember(target_p, chptr))
445			{
446			add_user_to_channel(chptr, target_p, fl, !have_many_nicks);
447			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s!%s@%s JOIN :%s",
448			target_p->name, target_p->username,
449			target_p->host, chptr->chname);
450			}
451
452			if (fl & CHFL_CHANOP)
453			{
454			*mbuf++ = 'o';
455			para[pargs++] = target_p->name;
456
457			if (pargs >= MAXMODEPARAMS)
458			{
459			/*
460			* Ok, the code is now going to "walk" through
461			* sendbuf, filling in para strings. So, I will use sptr
462			* to point into the sendbuf.
463			* Notice, that ircsprintf() returns the number of chars
464			* successfully inserted into string.
465			* - Dianora
466			*/
467
468			sptr = sendbuf;
469			*mbuf = '\0';
470			for(lcount = 0; lcount < MAXMODEPARAMS; lcount++)
471			{
472			slen = ircsprintf(sptr, " %s", para[lcount]); /* see? */
473			sptr += slen; /* ready for next */
474			}
475			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s%s",
476			servername, chptr->chname, modebuf, sendbuf);
477			mbuf = modebuf;
478			*mbuf++ = '+';
479
480			sendbuf[0] = '\0';
481			pargs = 0;
482			}
483			}
484			#ifdef HALFOPS
485			if (fl & CHFL_HALFOP)
486			{
487			*mbuf++ = 'h';
488			para[pargs++] = target_p->name;
489
490			if (pargs >= MAXMODEPARAMS)
491			{
492			sptr = sendbuf;
493			*mbuf = '\0';
494			for(lcount = 0; lcount < MAXMODEPARAMS; lcount++)
495			{
496			slen = ircsprintf(sptr, " %s", para[lcount]);
497			sptr += slen;
498			}
499			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s%s",
500			servername, chptr->chname, modebuf, sendbuf);
501
502			mbuf = modebuf;
503			*mbuf++ = '+';
504
505			sendbuf[0] = '\0';
506			pargs = 0;
507			}
508			}
509			#endif
510			if (fl & CHFL_VOICE)
511			{
512			*mbuf++ = 'v';
513			para[pargs++] = target_p->name;
514
515			if (pargs >= MAXMODEPARAMS)
516			{
517			sptr = sendbuf;
518			*mbuf = '\0';
519			for (lcount = 0; lcount < MAXMODEPARAMS; lcount++)
520			{
521			slen = ircsprintf(sptr, " %s", para[lcount]);
522			sptr += slen;
523			}
524			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s%s",
525			servername, chptr->chname, modebuf, sendbuf);
526
527			mbuf = modebuf;
528			*mbuf++ = '+';
529
530			sendbuf[0] = '\0';
531			pargs = 0;
532			}
533			}
534
535			nextnick:
536			if ((s = p) == NULL)
537			break;
538			while (*s == ' ')
539			s++;
540			if ((p = strchr(s, ' ')) != NULL)
541			{
542			*p++ = 0;
543			while (*p == ' ')
544			p++;
545			}
546			}
547
548			*mbuf = '\0';
549			*(nick_ptr - 1) = '\0';
550			*(uid_ptr - 1) = '\0';
551
552			/*
553			* checking for lcount < MAXMODEPARAMS at this time is wrong
554			* since the code has already verified above that pargs < MAXMODEPARAMS
555			* checking for para[lcount] != '\0' is also wrong, since
556			* there is no place where para[lcount] is set!
557			* - Dianora
558			*/
559
560			if (pargs != 0)
561			{
562			sptr = sendbuf;
563
564			for (lcount = 0; lcount < pargs; lcount++)
565			{
566			slen = ircsprintf(sptr, " %s", para[lcount]);
567			sptr += slen;
568			}
569
570			sendto_channel_local(ALL_MEMBERS, NO, chptr, ":%s MODE %s %s%s",
571			servername, chptr->chname, modebuf, sendbuf);
572			}
573
574			/* If this happens, its the result of a malformed SJOIN
575			* a remnant from the old persistent channel code. sigh
576			* Or it could be the result of a client just leaving
577			* and leaving us with a channel formed just as the client parts.
578			* - Dianora
579			*/
580
581			if ((dlink_list_length(&chptr->members) == 0) && isnew)
582			{
583			destroy_channel(chptr);
584			return;
585			}
586
587			if (parv[4 + args][0] == '\0')
588			return;
589
590			/* relay the SJOIN to other servers */
591			DLINK_FOREACH(m, serv_list.head)
592			{
593			target_p = m->data;
594
595			if (target_p == client_p)
596			continue;
597
598			if (IsCapable(target_p, CAP_TS6))
599			sendto_one(target_p, "%s", uid_buf);
600			else
601			sendto_one(target_p, "%s", nick_buf);
602			}
603
604			if (HasID(source_p) && !keep_our_modes)
605			{
606			if (dlink_list_length(&chptr->banlist) > 0)
607			remove_ban_list(chptr, client_p, &chptr->banlist,
608			'b', NOCAPS);
609
610			if (dlink_list_length(&chptr->exceptlist) > 0)
611			remove_ban_list(chptr, client_p, &chptr->exceptlist,
612			'e', CAP_EX);
613
614			if (dlink_list_length(&chptr->invexlist) > 0)
615			remove_ban_list(chptr, client_p, &chptr->invexlist,
616			'I', CAP_IE);
617			clear_ban_cache(chptr);
618			}
619			}
620
621			/* set_final_mode
622			*
623			* inputs - channel mode
624			* - old channel mode
625			* output - NONE
626			* side effects - walk through all the channel modes turning off modes
627			* that were on in oldmode but aren't on in mode.
628			* Then walk through turning on modes that are on in mode
629			* but were not set in oldmode.
630			*/
631
632			static const struct mode_letter
633			{
634			unsigned int mode;
635			unsigned char letter;
636			} flags[] = {
637			{ MODE_NOPRIVMSGS, 'n' },
638			{ MODE_TOPICLIMIT, 't' },
639			{ MODE_SECRET, 's' },
640			{ MODE_MODERATED, 'm' },
641			{ MODE_INVITEONLY, 'i' },
642			{ MODE_PRIVATE, 'p' },
643	michael	1150	{ MODE_OPERONLY, 'O' },
644			{ MODE_SSLONLY, 'S' },
645	adx	30	{ 0, '\0' }
646			};
647
648			static void
649			set_final_mode(struct Mode mode, struct Mode oldmode)
650			{
651			char *pbuf = parabuf;
652			int len;
653			int i;
654
655			*mbuf++ = '-';
656
657			for (i = 0; flags[i].letter; i++)
658			{
659			if ((flags[i].mode & oldmode->mode) &&
660			!(flags[i].mode & mode->mode))
661			*mbuf++ = flags[i].letter;
662			}
663
664			if (oldmode->limit != 0 && mode->limit == 0)
665			*mbuf++ = 'l';
666
667			if (oldmode->key[0] && !mode->key[0])
668			{
669			*mbuf++ = 'k';
670			len = ircsprintf(pbuf, "%s ", oldmode->key);
671			pbuf += len;
672			pargs++;
673			}
674
675			if (*(mbuf-1) == '-')
676			*(mbuf-1) = '+';
677			else
678			*mbuf++ = '+';
679
680			for (i = 0; flags[i].letter; i++)
681			{
682			if ((flags[i].mode & mode->mode) &&
683			!(flags[i].mode & oldmode->mode))
684			*mbuf++ = flags[i].letter;
685			}
686
687			if (mode->limit != 0 && oldmode->limit != mode->limit)
688			{
689			*mbuf++ = 'l';
690			len = ircsprintf(pbuf, "%d ", mode->limit);
691			pbuf += len;
692			pargs++;
693			}
694
695			if (mode->key[0] && strcmp(oldmode->key, mode->key))
696			{
697			*mbuf++ = 'k';
698			len = ircsprintf(pbuf, "%s ", mode->key);
699			pbuf += len;
700			pargs++;
701			}
702			if (*(mbuf-1) == '+')
703			*(mbuf-1) = '\0';
704			else
705			*mbuf = '\0';
706			}
707
708			/* remove_our_modes()
709			*
710			* inputs - pointer to channel to remove modes from
711			* - client pointer
712			* output - NONE
713			* side effects - Go through the local members, remove all their
714			* chanop modes etc., this side lost the TS.
715			*/
716			static void
717			remove_our_modes(struct Channel chptr, struct Client source_p)
718			{
719			remove_a_mode(chptr, source_p, CHFL_CHANOP, 'o');
720			#ifdef HALFOPS
721			remove_a_mode(chptr, source_p, CHFL_HALFOP, 'h');
722			#endif
723			remove_a_mode(chptr, source_p, CHFL_VOICE, 'v');
724			}
725
726			/* remove_a_mode()
727			*
728			* inputs - pointer to channel
729			* - server or client removing the mode
730			* - mask o/h/v mask to be removed
731			* - flag o/h/v to be removed
732			* output - NONE
733			* side effects - remove ONE mode from all members of a channel
734			*/
735			static void
736			remove_a_mode(struct Channel chptr, struct Client source_p,
737			int mask, char flag)
738			{
739			dlink_node *ptr;
740			struct Membership *ms;
741			char lmodebuf[MODEBUFLEN];
742			char *sp=sendbuf;
743			const char *lpara[MAXMODEPARAMS];
744			int count = 0;
745			int i;
746			int l;
747
748			mbuf = lmodebuf;
749			*mbuf++ = '-';
750			*sp = '\0';
751
752			DLINK_FOREACH(ptr, chptr->members.head)
753			{
754			ms = ptr->data;
755
756			if ((ms->flags & mask) == 0)
757			continue;
758
759			ms->flags &= ~mask;
760
761			lpara[count++] = ms->client_p->name;
762
763			*mbuf++ = flag;
764
765			if (count >= MAXMODEPARAMS)
766			{
767			for(i = 0; i < MAXMODEPARAMS; i++)
768			{
769			l = ircsprintf(sp, " %s", lpara[i]);
770			sp += l;
771			}
772
773			*mbuf = '\0';
774			sendto_channel_local(ALL_MEMBERS, NO, chptr,
775			":%s MODE %s %s%s",
776			(IsHidden(source_p) \|\|
777			ConfigServerHide.hide_servers) ?
778			me.name : source_p->name,
779			chptr->chname, lmodebuf, sendbuf);
780			mbuf = lmodebuf;
781			*mbuf++ = '-';
782			count = 0;
783			sp = sendbuf;
784			*sp = '\0';
785			}
786			}
787
788			if (count != 0)
789			{
790			*mbuf = '\0';
791			for(i = 0; i < count; i++)
792			{
793			l = ircsprintf(sp, " %s", lpara[i]);
794			sp += l;
795			}
796			sendto_channel_local(ALL_MEMBERS, NO, chptr,
797			":%s MODE %s %s%s",
798			(IsHidden(source_p) \|\| ConfigServerHide.hide_servers) ?
799			me.name : source_p->name,
800			chptr->chname, lmodebuf, sendbuf);
801			}
802			}
803
804			/* remove_ban_list()
805			*
806			* inputs - channel, source, list to remove, char of mode, caps required
807			* outputs - none
808			* side effects - given ban list is removed, modes are sent to local clients and
809			* non-ts6 servers linked through another uplink other than source_p
810			*/
811			static void
812			remove_ban_list(struct Channel chptr, struct Client source_p,
813			dlink_list *list, char c, int cap)
814			{
815			char lmodebuf[MODEBUFLEN];
816			char lparabuf[IRCD_BUFSIZE];
817			struct Ban *banptr = NULL;
818			dlink_node *ptr = NULL;
819			dlink_node *next_ptr = NULL;
820			char *pbuf = NULL;
821			int count = 0;
822			int cur_len, mlen, plen;
823
824			pbuf = lparabuf;
825
826			cur_len = mlen = ircsprintf(lmodebuf, ":%s MODE %s -",
827			source_p->name, chptr->chname);
828			mbuf = lmodebuf + mlen;
829
830			DLINK_FOREACH_SAFE(ptr, next_ptr, list->head)
831			{
832			banptr = ptr->data;
833
834			plen = banptr->len + 4; /* another +b and "!@ " */
835			if (count >= MAXMODEPARAMS \|\|
836			(cur_len + 1 /* space between */ + (plen - 1)) > IRCD_BUFSIZE - 2)
837			{
838			/* NUL-terminate and remove trailing space */
839			mbuf = (pbuf - 1) = '\0';
840			sendto_channel_local(ALL_MEMBERS, NO, chptr, "%s %s",
841			lmodebuf, lparabuf);
842	michael	885	sendto_server(source_p, chptr, cap, CAP_TS6,
843	adx	30	"%s %s", lmodebuf, lparabuf);
844
845			cur_len = mlen;
846			mbuf = lmodebuf + mlen;
847			pbuf = lparabuf;
848			count = 0;
849			}
850
851			*mbuf++ = c;
852			cur_len += plen;
853			pbuf += ircsprintf(pbuf, "%s!%s@%s ", banptr->name, banptr->username,
854			banptr->host);
855			++count;
856
857			remove_ban(banptr, list);
858			}
859
860			mbuf = (pbuf - 1) = '\0';
861			sendto_channel_local(ALL_MEMBERS, NO, chptr, "%s %s", lmodebuf, lparabuf);
862	michael	885	sendto_server(source_p, chptr, cap, CAP_TS6,
863	adx	30	"%s %s", lmodebuf, lparabuf);
864			}