trunk/src/channel_mode.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2015 ircd-hybrid 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 *  USA
 */

/*! \file channel_mode.c
 * \brief Controls modes on channels.
 * \version $Id$
 */

#include "stdinc.h"
#include "list.h"
#include "channel.h"
#include "channel_mode.h"
#include "client.h"
#include "conf.h"
#include "hostmask.h"
#include "irc_string.h"
#include "ircd.h"
#include "numeric.h"
#include "server.h"
#include "send.h"
#include "memory.h"
#include "mempool.h"
#include "parse.h"

/* 10 is a magic number in hybrid 6 NFI where it comes from -db */
#define BAN_FUDGE       10

static char nuh_mask[MAXPARA][IRCD_BUFSIZE];
/* some buffers for rebuilding channel/nick lists with ,'s */
static char modebuf[IRCD_BUFSIZE];
static char parabuf[MODEBUFLEN];
static struct ChModeChange mode_changes[IRCD_BUFSIZE];
static unsigned int mode_count;
static unsigned int mode_limit;  /* number of modes set other than simple */
static unsigned int simple_modes_mask;  /* bit mask of simple modes already set */
extern mp_pool_t *ban_pool;

const struct mode_letter chan_modes[] =
{
  { MODE_NOCTRL,     'c' },
  { MODE_INVITEONLY, 'i' },
  { MODE_MODERATED,  'm' },
  { MODE_NOPRIVMSGS, 'n' },
  { MODE_PRIVATE,    'p' },
  { MODE_REGISTERED, 'r' },
  { MODE_SECRET,     's' },
  { MODE_TOPICLIMIT, 't' },
  { MODE_NOCTCP,     'C' },
  { MODE_MODREG,     'M' },
  { MODE_OPERONLY,   'O' },
  { MODE_REGONLY,    'R' },
  { MODE_SSLONLY,    'S' },
  { MODE_NONOTICE,   'T' },
  { 0, '\0' }
};


/* check_string()
 *
 * inputs       - string to check
 * output       - pointer to modified string
 * side effects - Fixes a string so that the first white space found
 *                becomes an end of string marker (`\0`).
 *                returns the 'fixed' string or "*" if the string
 *                was NULL length or a NULL pointer.
 */
static char *
check_string(char *s)
{
  char *const str = s;
  static char star[] = "*";

  if (EmptyString(str))
    return star;

  for (; *s; ++s)
  {
    if (IsSpace(*s))
    {
      *s = '\0';
      break;
    }
  }

  return EmptyString(str) ? star : str;
}

/*
 * Ban functions to work with mode +b/e/I
 */
/* add the specified ID to the channel.
 *   -is 8/9/00
 */

int
add_id(struct Client *client_p, struct Channel *chptr, char *banid, unsigned int type)
{
  dlink_list *list = NULL;
  dlink_node *node = NULL;
  struct Ban *ban = NULL;
  size_t len = 0;
  char name[NICKLEN + 1] = "";
  char user[USERLEN + 1] = "";
  char host[HOSTLEN + 1] = "";
  struct split_nuh_item nuh;

  /* Don't let local clients overflow the b/e/I lists */
  if (MyClient(client_p))
  {
    unsigned int num_mask = dlink_list_length(&chptr->banlist) +
                            dlink_list_length(&chptr->exceptlist) +
                            dlink_list_length(&chptr->invexlist);

    if (num_mask >= ConfigChannel.max_bans)
    {
      sendto_one_numeric(client_p, &me, ERR_BANLISTFULL, chptr->name, banid);
      return 0;
    }

    collapse(banid);
  }

  nuh.nuhmask  = check_string(banid);
  nuh.nickptr  = name;
  nuh.userptr  = user;
  nuh.hostptr  = host;

  nuh.nicksize = sizeof(name);
  nuh.usersize = sizeof(user);
  nuh.hostsize = sizeof(host);

  split_nuh(&nuh);

  /*
   * Re-assemble a new n!u@h and print it back to banid for sending
   * the mode to the channel.
   */
  len = snprintf(banid, IRCD_BUFSIZE, "%s!%s@%s", name, user, host);

  switch (type)
  {
    case CHFL_BAN:
      list = &chptr->banlist;
      clear_ban_cache_channel(chptr);
      break;
    case CHFL_EXCEPTION:
      list = &chptr->exceptlist;
      clear_ban_cache_channel(chptr);
      break;
    case CHFL_INVEX:
      list = &chptr->invexlist;
      break;
    default:
      assert(0);
      return 0;
  }

  DLINK_FOREACH(node, list->head)
  {
    ban = node->data;

    if (!irccmp(ban->name, name) &&
        !irccmp(ban->user, user) &&
        !irccmp(ban->host, host))
      return 0;
  }

  ban = mp_pool_get(ban_pool);
  ban->when = CurrentTime;
  ban->len = len - 2;  /* -2 for ! + @ */
  ban->type = parse_netmask(host, &ban->addr, &ban->bits);
  strlcpy(ban->name, name, sizeof(ban->name));
  strlcpy(ban->user, user, sizeof(ban->user));
  strlcpy(ban->host, host, sizeof(ban->host));

  if (IsClient(client_p))
    snprintf(ban->who, sizeof(ban->who), "%s!%s@%s", client_p->name,
             client_p->username, client_p->host);
  else if (IsHidden(client_p) || ConfigServerHide.hide_servers)
    strlcpy(ban->who, me.name, sizeof(ban->who));
  else
    strlcpy(ban->who, client_p->name, sizeof(ban->who));

  dlinkAdd(ban, &ban->node, list);

  return 1;
}

/*
 * inputs       - pointer to channel
 *              - pointer to ban id
 *              - type of ban, i.e. ban, exception, invex
 * output       - 0 for failure, 1 for success
 * side effects -
 */
static int
del_id(struct Channel *chptr, char *banid, unsigned int type)
{
  dlink_list *list = NULL;
  dlink_node *node = NULL;
  char name[NICKLEN + 1] = "";
  char user[USERLEN + 1] = "";
  char host[HOSTLEN + 1] = "";
  struct split_nuh_item nuh;

  assert(banid);

  nuh.nuhmask  = check_string(banid);
  nuh.nickptr  = name;
  nuh.userptr  = user;
  nuh.hostptr  = host;

  nuh.nicksize = sizeof(name);
  nuh.usersize = sizeof(user);
  nuh.hostsize = sizeof(host);

  split_nuh(&nuh);

  /*
   * Re-assemble a new n!u@h and print it back to banid for sending
   * the mode to the channel.
   */
  snprintf(banid, IRCD_BUFSIZE, "%s!%s@%s", name, user, host);

  switch (type)
  {
    case CHFL_BAN:
      list = &chptr->banlist;
      clear_ban_cache_channel(chptr);
      break;
    case CHFL_EXCEPTION:
      list = &chptr->exceptlist;
      clear_ban_cache_channel(chptr);
      break;
    case CHFL_INVEX:
      list = &chptr->invexlist;
      break;
    default:
      assert(0);
      return 0;
  }

  DLINK_FOREACH(node, list->head)
  {
    struct Ban *ban = node->data;

    if (!irccmp(name, ban->name) &&
        !irccmp(user, ban->user) &&
        !irccmp(host, ban->host))
    {
      remove_ban(ban, list);
      return 1;
    }
  }

  return 0;
}

/* channel_modes()
 *
 * inputs       - pointer to channel
 *              - pointer to client
 *              - pointer to mode buf
 *              - pointer to parameter buf
 * output       - NONE
 * side effects - write the "simple" list of channel modes for channel
 * chptr onto buffer mbuf with the parameters in pbuf.
 */
void
channel_modes(struct Channel *chptr, struct Client *client_p, char *mbuf, char *pbuf)
{
  *mbuf++ = '+';
  *pbuf = '\0';

  for (const struct mode_letter *tab = chan_modes; tab->mode; ++tab)
    if (chptr->mode.mode & tab->mode)
      *mbuf++ = tab->letter;

  if (chptr->mode.limit)
  {
    *mbuf++ = 'l';

    if (IsServer(client_p) || IsMember(client_p, chptr))
      pbuf += sprintf(pbuf, "%d ", chptr->mode.limit);
  }

  if (chptr->mode.key[0])
  {
    *mbuf++ = 'k';

    if (IsServer(client_p) || IsMember(client_p, chptr))
      sprintf(pbuf, "%s ", chptr->mode.key);
  }

  *mbuf = '\0';
}

/* fix_key()
 *
 * inputs       - pointer to key to clean up
 * output       - pointer to cleaned up key
 * side effects - input string is modified
 *
 * stolen from Undernet's ircd  -orabidoo
 */
static char *
fix_key(char *arg)
{
  unsigned char *s, *t, c;

  for (s = t = (unsigned char *)arg; (c = *s); ++s)
  {
    c &= 0x7f;

    if (c != ':' && c > ' ' && c != ',')
      *t++ = c;
  }

  *t = '\0';
  return arg;
}

/*
 * inputs       - pointer to channel
 * output       - none
 * side effects - clear ban cache
 */
void
clear_ban_cache_channel(struct Channel *chptr)
{
  dlink_node *node = NULL;

  DLINK_FOREACH(node, chptr->locmembers.head)
  {
    struct Membership *member = node->data;
    member->flags &= ~(CHFL_BAN_SILENCED | CHFL_BAN_CHECKED);
  }
}

void
clear_ban_cache_client(struct Client *client_p)
{
  dlink_node *node = NULL;

  DLINK_FOREACH(node, client_p->channel.head)
  {
    struct Membership *member = node->data;
    member->flags &= ~(CHFL_BAN_SILENCED | CHFL_BAN_CHECKED);
  }
}

/*
 * Bitmasks for various error returns that set_channel_mode should only return
 * once per call  -orabidoo
 */
enum
{
  SM_ERR_NOOPS        = 1 << 0,  /* No chan ops */
  SM_ERR_UNKNOWN      = 1 << 1,
  SM_ERR_RPL_B        = 1 << 2,
  SM_ERR_RPL_E        = 1 << 3,
  SM_ERR_RPL_I        = 1 << 4,
  SM_ERR_NOTONCHANNEL = 1 << 5,  /* Client is not on channel */
  SM_ERR_NOTOPER      = 1 << 6,
  SM_ERR_ONLYSERVER   = 1 << 7
};

/* Mode functions handle mode changes for a particular mode... */
static void
chm_nosuch(struct Client *source_p, struct Channel *chptr, int parc, int *parn,
           char **parv, int *errors, int alev, int dir, char c, unsigned int d)
{
  if (*errors & SM_ERR_UNKNOWN)
    return;

  *errors |= SM_ERR_UNKNOWN;
  sendto_one_numeric(source_p, &me, ERR_UNKNOWNMODE, c);
}

static void
chm_simple(struct Client *source_p, struct Channel *chptr, int parc, int *parn,
           char **parv, int *errors, int alev, int dir, char c, unsigned int d)
{
  if (alev < CHACCESS_HALFOP)
  {
    if (!(*errors & SM_ERR_NOOPS))
      sendto_one_numeric(source_p, &me,
                         alev == CHACCESS_NOTONCHAN ? ERR_NOTONCHANNEL :
                         ERR_CHANOPRIVSNEEDED, chptr->name);

    *errors |= SM_ERR_NOOPS;
    return;
  }

  /* If have already dealt with this simple mode, ignore it */
  if (simple_modes_mask & d)
    return;

  simple_modes_mask |= d;

  /* setting + */
  /* Apparently, (though no one has ever told the hybrid group directly)
   * admins don't like redundant mode checking. ok. It would have been nice
   * if you had have told us directly. I've left the original code snippets
   * in place.
   *
   * -Dianora
   */
  if (dir == MODE_ADD) /* && !(chptr->mode.mode & d)) */
  {
    chptr->mode.mode |= d;

    mode_changes[mode_count].letter = c;
    mode_changes[mode_count].arg = NULL;
    mode_changes[mode_count].id = NULL;
    mode_changes[mode_count++].dir = dir;
  }
  else if (dir == MODE_DEL) /* && (chptr->mode.mode & d)) */
  {
    /* setting - */

    chptr->mode.mode &= ~d;

    mode_changes[mode_count].letter = c;
    mode_changes[mode_count].arg = NULL;
    mode_changes[mode_count].id = NULL;
    mode_changes[mode_count++].dir = dir;
  }
}

static void
chm_registered(struct Client *source_p, struct Channel *chptr, int parc, int *parn,
               char **parv, int *errors, int alev, int dir, char c, unsigned int d)
{
  if (!IsServer(source_p) && !HasFlag(source_p, FLAGS_SERVICE))
  {
    if (!(*errors & SM_ERR_ONLYSERVER))
      sendto_one_numeric(source_p, &me,
                         alev == CHACCESS_NOTONCHAN ? ERR_NOTONCHANNEL :
                         ERR_ONLYSERVERSCANCHANGE, chptr->name);

    *errors |= SM_ERR_ONLYSERVER;
    return;
  }

  /* If have already dealt with this simple mode, ignore it */
  if (simple_modes_mask & d)
    return;

  simple_modes_mask |= d;

  /* setting + */
  /* Apparently, (though no one has ever told the hybrid group directly)
   * admins don't like redundant mode checking. ok. It would have been nice
   * if you had have told us directly. I've left the original code snippets
   * in place.
   *
   * -Dianora
   */
  if (dir == MODE_ADD) /* && !(chptr->mode.mode & d)) */
  {
    chptr->mode.mode |= d;

    mode_changes[mode_count].letter = c;
    mode_changes[mode_count].arg = NULL;
    mode_changes[mode_count].id = NULL;
    mode_changes[mode_count++].dir = dir;
  }
  else if (dir == MODE_DEL) /* && (chptr->mode.mode & d)) */
  {
    /* setting - */

    chptr->mode.mode &= ~d;

    mode_changes[mode_count].letter = c;
    mode_changes[mode_count].arg = NULL;
    mode_changes[mode_count].id = NULL;
    mode_changes[mode_count++].dir = dir;
  }
}

static void
chm_operonly(struct Client *source_p, struct Channel *chptr, int parc, int *parn,
             char **parv, int *errors, int alev, int dir, char c, unsigned int d)
{
  if (alev < CHACCESS_HALFOP)
  {
    if (!(*errors & SM_ERR_NOOPS))
      sendto_one_numeric(source_p, &me,
                         alev == CHACCESS_NOTONCHAN ? ERR_NOTONCHANNEL :
                         ERR_CHANOPRIVSNEEDED, chptr->name);

    *errors |= SM_ERR_NOOPS;
    return;
  }

  if (MyClient(source_p) && !HasUMode(source_p, UMODE_OPER))
  {
    if (!(*errors & SM_ERR_NOTOPER))
      sendto_one_numeric(source_p, &me, ERR_NOPRIVILEGES);

    *errors |= SM_ERR_NOTOPER;
    return;
  }

  /* If have already dealt with this simple mode, ignore it */
  if (simple_modes_mask & d)
    return;

  simple_modes_mask |= d;

  if (dir == MODE_ADD) /* && !(chptr->mode.mode & d)) */
  {
    chptr->mode.mode |= d;

    mode_changes[mode_count].letter = c;
    mode_changes[mode_count].arg = NULL;
    mode_changes[mode_count].id = NULL;
    mode_changes[mode_count++].dir = dir;
  }
  else if (dir == MODE_DEL) /* && (chptr->mode.mode & d)) */
  {
    /* setting - */

    chptr->mode.mode &= ~d;

    mode_changes[mode_count].letter = c;
    mode_changes[mode_count].arg = NULL;
    mode_changes[mode_count].id = NULL;
    mode_changes[mode_count++].dir = dir;
  }
}

static void
chm_ban(struct Client *source_p, struct Channel *chptr, int parc, int *parn,
        char **parv, int *errors, int alev, int dir, char c, unsigned int d)
{
  char *mask = NULL;

  if (dir == MODE_QUERY || parc <= *parn)
  {
    dlink_node *node = NULL;

    if (*errors & SM_ERR_RPL_B)
      return;

    *errors |= SM_ERR_RPL_B;

    DLINK_FOREACH(node, chptr->banlist.head)
    {
      const struct Ban *ban = node->data;
      sendto_one_numeric(source_p, &me, RPL_BANLIST, chptr->name,
                         ban->name, ban->user, ban->host,
                         ban->who, ban->when);
    }

    sendto_one_numeric(source_p, &me, RPL_ENDOFBANLIST, chptr->name);
    return;
  }

  if (alev < CHACCESS_HALFOP)
  {
    if (!(*errors & SM_ERR_NOOPS))
      sendto_one_numeric(source_p, &me,
                         alev == CHACCESS_NOTONCHAN ? ERR_NOTONCHANNEL :
                         ERR_CHANOPRIVSNEEDED, chptr->name);

    *errors |= SM_ERR_NOOPS;
    return;
  }

  if (MyClient(source_p) && (++mode_limit > MAXMODEPARAMS))
    return;

  mask = nuh_mask[*parn];
  strlcpy(mask, parv[*parn], sizeof(nuh_mask[*parn]));
  ++(*parn);

  if (*mask == ':' || (!MyConnect(source_p) && strchr(mask, ' ')))
    return;

  switch (dir)
  {
    case MODE_ADD:
      if (!add_id(source_p, chptr, mask, CHFL_BAN))
        return;
      break;
    case MODE_DEL:
      if (!del_id(chptr, mask, CHFL_BAN))
        return;
      break;
    default:
      assert(0);
  }

  mode_changes[mode_count].letter = c;
  mode_changes[mode_count].arg = mask;
  mode_changes[mode_count].id = NULL;
  mode_changes[mode_count++].dir = dir;
}

static void
chm_except(struct Client *source_p, struct Channel *chptr, int parc, int *parn,
           char **parv, int *errors, int alev, int dir, char c, unsigned int d)
{
  char *mask = NULL;

  if (dir == MODE_QUERY || parc <= *parn)
  {
    dlink_node *node = NULL;

    if (*errors & SM_ERR_RPL_E)
      return;

    *errors |= SM_ERR_RPL_E;

    DLINK_FOREACH(node, chptr->exceptlist.head)
    {
      const struct Ban *ban = node->data;

      sendto_one_numeric(source_p, &me, RPL_EXCEPTLIST, chptr->name,
                         ban->name, ban->user, ban->host,
                         ban->who, ban->when);
    }

    sendto_one_numeric(source_p, &me, RPL_ENDOFEXCEPTLIST, chptr->name);
    return;
  }

  if (alev < CHACCESS_HALFOP)
  {
    if (!(*errors & SM_ERR_NOOPS))
      sendto_one_numeric(source_p, &me,
                         alev == CHACCESS_NOTONCHAN ? ERR_NOTONCHANNEL :
                         ERR_CHANOPRIVSNEEDED, chptr->name);

    *errors |= SM_ERR_NOOPS;
    return;
  }

  if (MyClient(source_p) && (++mode_limit > MAXMODEPARAMS))
    return;

  mask = nuh_mask[*parn];
  strlcpy(mask, parv[*parn], sizeof(nuh_mask[*parn]));
  ++(*parn);

  if (*mask == ':' || (!MyConnect(source_p) && strchr(mask, ' ')))
    return;

  switch (dir)
  {
    case MODE_ADD:
      if (!add_id(source_p, chptr, mask, CHFL_EXCEPTION))
        return;
      break;
    case MODE_DEL:
      if (!del_id(chptr, mask, CHFL_EXCEPTION))
        return;
      break;
    default:
      assert(0);
  }

  mode_changes[mode_count].letter = c;
  mode_changes[mode_count].arg = mask;
  mode_changes[mode_count].id = NULL;
  mode_changes[mode_count++].dir = dir;
}

static void
chm_invex(struct Client *source_p, struct Channel *chptr, int parc, int *parn,
          char **parv, int *errors, int alev, int dir, char c, unsigned int d)
{
  char *mask = NULL;

  if (dir == MODE_QUERY || parc <= *parn)
  {
    dlink_node *node = NULL;

    if (*errors & SM_ERR_RPL_I)
      return;

    *errors |= SM_ERR_RPL_I;

    DLINK_FOREACH(node, chptr->invexlist.head)
    {
      const struct Ban *ban = node->data;

      sendto_one_numeric(source_p, &me, RPL_INVEXLIST, chptr->name,
                         ban->name, ban->user, ban->host,
                         ban->who, ban->when);
    }

    sendto_one_numeric(source_p, &me, RPL_ENDOFINVEXLIST, chptr->name);
    return;
  }

  if (alev < CHACCESS_HALFOP)
  {
    if (!(*errors & SM_ERR_NOOPS))
      sendto_one_numeric(source_p, &me,
                         alev == CHACCESS_NOTONCHAN ? ERR_NOTONCHANNEL :
                         ERR_CHANOPRIVSNEEDED, chptr->name);

    *errors |= SM_ERR_NOOPS;
    return;
  }

  if (MyClient(source_p) && (++mode_limit > MAXMODEPARAMS))
    return;

  mask = nuh_mask[*parn];
  strlcpy(mask, parv[*parn], sizeof(nuh_mask[*parn]));
  ++(*parn);

  if (*mask == ':' || (!MyConnect(source_p) && strchr(mask, ' ')))
    return;

  switch (dir)
  {
    case MODE_ADD:
      if (!add_id(source_p, chptr, mask, CHFL_INVEX))
        return;
      break;
    case MODE_DEL:
      if (!del_id(chptr, mask, CHFL_INVEX))
        return;
      break;
    default:
      assert(0);
  }

  mode_changes[mode_count].letter = c;
  mode_changes[mode_count].arg = mask;
  mode_changes[mode_count].id = NULL;
  mode_changes[mode_count++].dir = dir;
}

static void
chm_voice(struct Client *source_p, struct Channel *chptr, int parc, int *parn,
          char **parv, int *errors, int alev, int dir, char c, unsigned int d)
{
  struct Client *target_p;
  struct Membership *member;

  if (alev < CHACCESS_HALFOP)
  {
    if (!(*errors & SM_ERR_NOOPS))
      sendto_one_numeric(source_p, &me,
                         alev == CHACCESS_NOTONCHAN ? ERR_NOTONCHANNEL :
                         ERR_CHANOPRIVSNEEDED, chptr->name);

    *errors |= SM_ERR_NOOPS;
    return;
  }

  if (dir == MODE_QUERY || parc <= *parn)
    return;

  if ((target_p = find_chasing(source_p, parv[(*parn)++])) == NULL)
    return;  /* find_chasing sends ERR_NOSUCHNICK */

  if ((member = find_channel_link(target_p, chptr)) == NULL)
  {
    if (!(*errors & SM_ERR_NOTONCHANNEL))
      sendto_one_numeric(source_p, &me, ERR_USERNOTINCHANNEL, target_p->name, chptr->name);

    *errors |= SM_ERR_NOTONCHANNEL;
    return;
  }

  if (MyClient(source_p) && (++mode_limit > MAXMODEPARAMS))
    return;

  /* no redundant mode changes */
  if (dir == MODE_ADD &&  has_member_flags(member, CHFL_VOICE))
    return;

  if (dir == MODE_DEL && !has_member_flags(member, CHFL_VOICE))
    return;

  mode_changes[mode_count].letter = c;
  mode_changes[mode_count].arg = target_p->name;
  mode_changes[mode_count].id = target_p->id;
  mode_changes[mode_count++].dir = dir;

  if (dir == MODE_ADD)
    AddMemberFlag(member, CHFL_VOICE);
  else
    DelMemberFlag(member, CHFL_VOICE);
}

static void
chm_hop(struct Client *source_p, struct Channel *chptr, int parc, int *parn,
        char **parv, int *errors, int alev, int dir, char c, unsigned int d)
{
  struct Client *target_p;
  struct Membership *member;

  if (alev < CHACCESS_CHANOP)
  {
    if (!(*errors & SM_ERR_NOOPS))
      sendto_one_numeric(source_p, &me,
                         alev == CHACCESS_NOTONCHAN ? ERR_NOTONCHANNEL :
                         ERR_CHANOPRIVSNEEDED, chptr->name);

    *errors |= SM_ERR_NOOPS;
    return;
  }

  if (dir == MODE_QUERY || parc <= *parn)
    return;

  if ((target_p = find_chasing(source_p, parv[(*parn)++])) == NULL)
    return;  /* find_chasing sends ERR_NOSUCHNICK */

  if ((member = find_channel_link(target_p, chptr)) == NULL)
  {
    if (!(*errors & SM_ERR_NOTONCHANNEL))
      sendto_one_numeric(source_p, &me, ERR_USERNOTINCHANNEL, target_p->name, chptr->name);

    *errors |= SM_ERR_NOTONCHANNEL;
    return;
  }

  if (MyClient(source_p) && (++mode_limit > MAXMODEPARAMS))
    return;

  /* no redundant mode changes */
  if (dir == MODE_ADD &&  has_member_flags(member, CHFL_HALFOP))
    return;

  if (dir == MODE_DEL && !has_member_flags(member, CHFL_HALFOP))
    return;

  mode_changes[mode_count].letter = c;
  mode_changes[mode_count].arg = target_p->name;
  mode_changes[mode_count].id = target_p->id;
  mode_changes[mode_count++].dir = dir;

  if (dir == MODE_ADD)
    AddMemberFlag(member, CHFL_HALFOP);
  else
    DelMemberFlag(member, CHFL_HALFOP);
}

static void
chm_op(struct Client *source_p, struct Channel *chptr, int parc, int *parn,
       char **parv, int *errors, int alev, int dir, char c, unsigned int d)
{
  struct Client *target_p;
  struct Membership *member;

  if (alev < CHACCESS_CHANOP)
  {
    if (!(*errors & SM_ERR_NOOPS))
      sendto_one_numeric(source_p, &me,
                         alev == CHACCESS_NOTONCHAN ? ERR_NOTONCHANNEL :
                         ERR_CHANOPRIVSNEEDED, chptr->name);

    *errors |= SM_ERR_NOOPS;
    return;
  }

  if (dir == MODE_QUERY || parc <= *parn)
    return;

  if ((target_p = find_chasing(source_p, parv[(*parn)++])) == NULL)
    return;  /* find_chasing sends ERR_NOSUCHNICK */

  if ((member = find_channel_link(target_p, chptr)) == NULL)
  {
    if (!(*errors & SM_ERR_NOTONCHANNEL))
      sendto_one_numeric(source_p, &me, ERR_USERNOTINCHANNEL, target_p->name, chptr->name);

    *errors |= SM_ERR_NOTONCHANNEL;
    return;
  }

  if (MyClient(source_p) && (++mode_limit > MAXMODEPARAMS))
    return;

  /* no redundant mode changes */
  if (dir == MODE_ADD &&  has_member_flags(member, CHFL_CHANOP))
    return;

  if (dir == MODE_DEL && !has_member_flags(member, CHFL_CHANOP))
    return;

  mode_changes[mode_count].letter = c;
  mode_changes[mode_count].arg = target_p->name;
  mode_changes[mode_count].id = target_p->id;
  mode_changes[mode_count++].dir = dir;

  if (dir == MODE_ADD)
    AddMemberFlag(member, CHFL_CHANOP);
  else
    DelMemberFlag(member, CHFL_CHANOP);
}

static void
chm_limit(struct Client *source_p, struct Channel *chptr, int parc, int *parn,
          char **parv, int *errors, int alev, int dir, char c, unsigned int d)
{
  int limit = 0;

  if (alev < CHACCESS_HALFOP)
  {
    if (!(*errors & SM_ERR_NOOPS))
      sendto_one_numeric(source_p, &me,
                         alev == CHACCESS_NOTONCHAN ? ERR_NOTONCHANNEL :
                         ERR_CHANOPRIVSNEEDED, chptr->name);
    *errors |= SM_ERR_NOOPS;
    return;
  }

  if (dir == MODE_QUERY)
    return;

  if (dir == MODE_ADD && parc > *parn)
  {
    char *const lstr = parv[(*parn)++];

    if (EmptyString(lstr) || (limit = atoi(lstr)) <= 0)
      return;

    sprintf(lstr, "%d", limit);

    /* If somebody sets MODE #channel +ll 1 2, accept latter --fl */
    for (unsigned int i = 0; i < mode_count; ++i)
      if (mode_changes[i].letter == c && mode_changes[i].dir == MODE_ADD)
        mode_changes[i].letter = 0;

    mode_changes[mode_count].letter = c;
    mode_changes[mode_count].arg = lstr;
    mode_changes[mode_count].id = NULL;
    mode_changes[mode_count++].dir = dir;

    chptr->mode.limit = limit;
  }
  else if (dir == MODE_DEL)
  {
    if (!chptr->mode.limit)
      return;

    chptr->mode.limit = 0;

    mode_changes[mode_count].letter = c;
    mode_changes[mode_count].arg = NULL;
    mode_changes[mode_count].id = NULL;
    mode_changes[mode_count++].dir = dir;
  }
}

static void
chm_key(struct Client *source_p, struct Channel *chptr, int parc, int *parn,
        char **parv, int *errors, int alev, int dir, char c, unsigned int d)
{
  if (alev < CHACCESS_HALFOP)
  {
    if (!(*errors & SM_ERR_NOOPS))
      sendto_one_numeric(source_p, &me,
                         alev == CHACCESS_NOTONCHAN ? ERR_NOTONCHANNEL :
                         ERR_CHANOPRIVSNEEDED, chptr->name);
    *errors |= SM_ERR_NOOPS;
    return;
  }

  if (dir == MODE_QUERY)
    return;

  if (dir == MODE_ADD && parc > *parn)
  {
    char *const key = fix_key(parv[(*parn)++]);

    if (EmptyString(key))
      return;

    assert(key[0] != ' ');
    strlcpy(chptr->mode.key, key, sizeof(chptr->mode.key));

    /* If somebody does MODE #channel +kk a b, accept latter --fl */
    for (unsigned int i = 0; i < mode_count; ++i)
      if (mode_changes[i].letter == c && mode_changes[i].dir == MODE_ADD)
        mode_changes[i].letter = 0;

    mode_changes[mode_count].letter = c;
    mode_changes[mode_count].arg = chptr->mode.key;
    mode_changes[mode_count].id = NULL;
    mode_changes[mode_count++].dir = dir;
  }
  else if (dir == MODE_DEL)
  {
    if (parc > *parn)
      ++(*parn);

    if (chptr->mode.key[0] == '\0')
      return;

    chptr->mode.key[0] = '\0';

    mode_changes[mode_count].letter = c;
    mode_changes[mode_count].arg = "*";
    mode_changes[mode_count].id = NULL;
    mode_changes[mode_count++].dir = dir;
  }
}

const struct ChannelMode ModeTable[256] =
{
  { chm_nosuch,  0 },                   /* 0x00 */
  { chm_nosuch,  0 },                   /* 0x01 */
  { chm_nosuch,  0 },                   /* 0x02 */
  { chm_nosuch,  0 },                   /* 0x03 */
  { chm_nosuch,  0 },                   /* 0x04 */
  { chm_nosuch,  0 },                   /* 0x05 */
  { chm_nosuch,  0 },                   /* 0x06 */
  { chm_nosuch,  0 },                   /* 0x07 */
  { chm_nosuch,  0 },                   /* 0x08 */
  { chm_nosuch,  0 },                   /* 0x09 */
  { chm_nosuch,  0 },                   /* 0x0a */
  { chm_nosuch,  0 },                   /* 0x0b */
  { chm_nosuch,  0 },                   /* 0x0c */
  { chm_nosuch,  0 },                   /* 0x0d */
  { chm_nosuch,  0 },                   /* 0x0e */
  { chm_nosuch,  0 },                   /* 0x0f */
  { chm_nosuch,  0 },                   /* 0x10 */
  { chm_nosuch,  0 },                   /* 0x11 */
  { chm_nosuch,  0 },                   /* 0x12 */
  { chm_nosuch,  0 },                   /* 0x13 */
  { chm_nosuch,  0 },                   /* 0x14 */
  { chm_nosuch,  0 },                   /* 0x15 */
  { chm_nosuch,  0 },                   /* 0x16 */
  { chm_nosuch,  0 },                   /* 0x17 */
  { chm_nosuch,  0 },                   /* 0x18 */
  { chm_nosuch,  0 },                   /* 0x19 */
  { chm_nosuch,  0 },                   /* 0x1a */
  { chm_nosuch,  0 },                   /* 0x1b */
  { chm_nosuch,  0 },                   /* 0x1c */
  { chm_nosuch,  0 },                   /* 0x1d */
  { chm_nosuch,  0 },                   /* 0x1e */
  { chm_nosuch,  0 },                   /* 0x1f */
  { chm_nosuch,  0 },                   /* 0x20 */
  { chm_nosuch,  0 },                   /* 0x21 */
  { chm_nosuch,  0 },                   /* 0x22 */
  { chm_nosuch,  0 },                   /* 0x23 */
  { chm_nosuch,  0 },                   /* 0x24 */
  { chm_nosuch,  0 },                   /* 0x25 */
  { chm_nosuch,  0 },                   /* 0x26 */
  { chm_nosuch,  0 },                   /* 0x27 */
  { chm_nosuch,  0 },                   /* 0x28 */
  { chm_nosuch,  0 },                   /* 0x29 */
  { chm_nosuch,  0 },                   /* 0x2a */
  { chm_nosuch,  0 },                   /* 0x2b */
  { chm_nosuch,  0 },                   /* 0x2c */
  { chm_nosuch,  0 },                   /* 0x2d */
  { chm_nosuch,  0 },                   /* 0x2e */
  { chm_nosuch,  0 },                   /* 0x2f */
  { chm_nosuch,  0 },                   /* 0x30 */
  { chm_nosuch,  0 },                   /* 0x31 */
  { chm_nosuch,  0 },                   /* 0x32 */
  { chm_nosuch,  0 },                   /* 0x33 */
  { chm_nosuch,  0 },                   /* 0x34 */
  { chm_nosuch,  0 },                   /* 0x35 */
  { chm_nosuch,  0 },                   /* 0x36 */
  { chm_nosuch,  0 },                   /* 0x37 */
  { chm_nosuch,  0 },                   /* 0x38 */
  { chm_nosuch,  0 },                   /* 0x39 */
  { chm_nosuch,  0 },                   /* 0x3a */
  { chm_nosuch,  0 },                   /* 0x3b */
  { chm_nosuch,  0 },                   /* 0x3c */
  { chm_nosuch,  0 },                   /* 0x3d */
  { chm_nosuch,  0 },                   /* 0x3e */
  { chm_nosuch,  0 },                   /* 0x3f */
  { chm_nosuch,  0 },                   /* @ */
  { chm_nosuch,  0 },                   /* A */
  { chm_nosuch,  0 },                   /* B */
  { chm_simple,  MODE_NOCTCP },         /* C */
  { chm_nosuch,  0 },                   /* D */
  { chm_nosuch,  0 },                   /* E */
  { chm_nosuch,  0 },                   /* F */
  { chm_nosuch,  0 },                   /* G */
  { chm_nosuch,  0 },                   /* H */
  { chm_invex,   0 },                   /* I */
  { chm_nosuch,  0 },                   /* J */
  { chm_nosuch,  0 },                   /* K */
  { chm_nosuch,  0 },                   /* L */
  { chm_simple, MODE_MODREG},           /* M */
  { chm_nosuch,  0 },                   /* N */
  { chm_operonly, MODE_OPERONLY},       /* O */
  { chm_nosuch,  0 },                   /* P */
  { chm_nosuch,  0 },                   /* Q */
  { chm_simple, MODE_REGONLY},          /* R */
  { chm_simple, MODE_SSLONLY},          /* S */
  { chm_simple, MODE_NONOTICE},         /* T */
  { chm_nosuch,  0 },                   /* U */
  { chm_nosuch,  0 },                   /* V */
  { chm_nosuch,  0 },                   /* W */
  { chm_nosuch,  0 },                   /* X */
  { chm_nosuch,  0 },                   /* Y */
  { chm_nosuch,  0 },                   /* Z */
  { chm_nosuch,  0 },
  { chm_nosuch,  0 },
  { chm_nosuch,  0 },
  { chm_nosuch,  0 },
  { chm_nosuch,  0 },
  { chm_nosuch,  0 },
  { chm_nosuch,  0 },                   /* a */
  { chm_ban,     0 },                   /* b */
  { chm_simple, MODE_NOCTRL},           /* c */
  { chm_nosuch,  0 },                   /* d */
  { chm_except,  0 },                   /* e */
  { chm_nosuch,  0 },                   /* f */
  { chm_nosuch,  0 },                   /* g */
  { chm_hop,     0 },                   /* h */
  { chm_simple,     MODE_INVITEONLY },  /* i */
  { chm_nosuch,     0               },  /* j */
  { chm_key,        0               },  /* k */
  { chm_limit,      0               },  /* l */
  { chm_simple,     MODE_MODERATED  },  /* m */
  { chm_simple,     MODE_NOPRIVMSGS },  /* n */
  { chm_op,         0               },  /* o */
  { chm_simple,     MODE_PRIVATE    },  /* p */
  { chm_nosuch,     0               },  /* q */
  { chm_registered, MODE_REGISTERED },  /* r */
  { chm_simple,     MODE_SECRET     },  /* s */
  { chm_simple,     MODE_TOPICLIMIT },  /* t */
  { chm_nosuch,     0               },  /* u */
  { chm_voice,      0               },  /* v */
  { chm_nosuch,     0               },  /* w */
  { chm_nosuch,     0               },  /* x */
  { chm_nosuch,     0               },  /* y */
  { chm_nosuch,     0               },  /* z */
  { chm_nosuch,  0 },                   /* 0x7b */
  { chm_nosuch,  0 },                   /* 0x7c */
  { chm_nosuch,  0 },                   /* 0x7d */
  { chm_nosuch,  0 },                   /* 0x7e */
  { chm_nosuch,  0 },                   /* 0x7f */
  { chm_nosuch,  0 },                   /* 0x80 */
  { chm_nosuch,  0 },                   /* 0x81 */
  { chm_nosuch,  0 },                   /* 0x82 */
  { chm_nosuch,  0 },                   /* 0x83 */
  { chm_nosuch,  0 },                   /* 0x84 */
  { chm_nosuch,  0 },                   /* 0x85 */
  { chm_nosuch,  0 },                   /* 0x86 */
  { chm_nosuch,  0 },                   /* 0x87 */
  { chm_nosuch,  0 },                   /* 0x88 */
  { chm_nosuch,  0 },                   /* 0x89 */
  { chm_nosuch,  0 },                   /* 0x8a */
  { chm_nosuch,  0 },                   /* 0x8b */
  { chm_nosuch,  0 },                   /* 0x8c */
  { chm_nosuch,  0 },                   /* 0x8d */
  { chm_nosuch,  0 },                   /* 0x8e */
  { chm_nosuch,  0 },                   /* 0x8f */
  { chm_nosuch,  0 },                   /* 0x90 */
  { chm_nosuch,  0 },                   /* 0x91 */
  { chm_nosuch,  0 },                   /* 0x92 */
  { chm_nosuch,  0 },                   /* 0x93 */
  { chm_nosuch,  0 },                   /* 0x94 */
  { chm_nosuch,  0 },                   /* 0x95 */
  { chm_nosuch,  0 },                   /* 0x96 */
  { chm_nosuch,  0 },                   /* 0x97 */
  { chm_nosuch,  0 },                   /* 0x98 */
  { chm_nosuch,  0 },                   /* 0x99 */
  { chm_nosuch,  0 },                   /* 0x9a */
  { chm_nosuch,  0 },                   /* 0x9b */
  { chm_nosuch,  0 },                   /* 0x9c */
  { chm_nosuch,  0 },                   /* 0x9d */
  { chm_nosuch,  0 },                   /* 0x9e */
  { chm_nosuch,  0 },                   /* 0x9f */
  { chm_nosuch,  0 },                   /* 0xa0 */
  { chm_nosuch,  0 },                   /* 0xa1 */
  { chm_nosuch,  0 },                   /* 0xa2 */
  { chm_nosuch,  0 },                   /* 0xa3 */
  { chm_nosuch,  0 },                   /* 0xa4 */
  { chm_nosuch,  0 },                   /* 0xa5 */
  { chm_nosuch,  0 },                   /* 0xa6 */
  { chm_nosuch,  0 },                   /* 0xa7 */
  { chm_nosuch,  0 },                   /* 0xa8 */
  { chm_nosuch,  0 },                   /* 0xa9 */
  { chm_nosuch,  0 },                   /* 0xaa */
  { chm_nosuch,  0 },                   /* 0xab */
  { chm_nosuch,  0 },                   /* 0xac */
  { chm_nosuch,  0 },                   /* 0xad */
  { chm_nosuch,  0 },                   /* 0xae */
  { chm_nosuch,  0 },                   /* 0xaf */
  { chm_nosuch,  0 },                   /* 0xb0 */
  { chm_nosuch,  0 },                   /* 0xb1 */
  { chm_nosuch,  0 },                   /* 0xb2 */
  { chm_nosuch,  0 },                   /* 0xb3 */
  { chm_nosuch,  0 },                   /* 0xb4 */
  { chm_nosuch,  0 },                   /* 0xb5 */
  { chm_nosuch,  0 },                   /* 0xb6 */
  { chm_nosuch,  0 },                   /* 0xb7 */
  { chm_nosuch,  0 },                   /* 0xb8 */
  { chm_nosuch,  0 },                   /* 0xb9 */
  { chm_nosuch,  0 },                   /* 0xba */
  { chm_nosuch,  0 },                   /* 0xbb */
  { chm_nosuch,  0 },                   /* 0xbc */
  { chm_nosuch,  0 },                   /* 0xbd */
  { chm_nosuch,  0 },                   /* 0xbe */
  { chm_nosuch,  0 },                   /* 0xbf */
  { chm_nosuch,  0 },                   /* 0xc0 */
  { chm_nosuch,  0 },                   /* 0xc1 */
  { chm_nosuch,  0 },                   /* 0xc2 */
  { chm_nosuch,  0 },                   /* 0xc3 */
  { chm_nosuch,  0 },                   /* 0xc4 */
  { chm_nosuch,  0 },                   /* 0xc5 */
  { chm_nosuch,  0 },                   /* 0xc6 */
  { chm_nosuch,  0 },                   /* 0xc7 */
  { chm_nosuch,  0 },                   /* 0xc8 */
  { chm_nosuch,  0 },                   /* 0xc9 */
  { chm_nosuch,  0 },                   /* 0xca */
  { chm_nosuch,  0 },                   /* 0xcb */
  { chm_nosuch,  0 },                   /* 0xcc */
  { chm_nosuch,  0 },                   /* 0xcd */
  { chm_nosuch,  0 },                   /* 0xce */
  { chm_nosuch,  0 },                   /* 0xcf */
  { chm_nosuch,  0 },                   /* 0xd0 */
  { chm_nosuch,  0 },                   /* 0xd1 */
  { chm_nosuch,  0 },                   /* 0xd2 */
  { chm_nosuch,  0 },                   /* 0xd3 */
  { chm_nosuch,  0 },                   /* 0xd4 */
  { chm_nosuch,  0 },                   /* 0xd5 */
  { chm_nosuch,  0 },                   /* 0xd6 */
  { chm_nosuch,  0 },                   /* 0xd7 */
  { chm_nosuch,  0 },                   /* 0xd8 */
  { chm_nosuch,  0 },                   /* 0xd9 */
  { chm_nosuch,  0 },                   /* 0xda */
  { chm_nosuch,  0 },                   /* 0xdb */
  { chm_nosuch,  0 },                   /* 0xdc */
  { chm_nosuch,  0 },                   /* 0xdd */
  { chm_nosuch,  0 },                   /* 0xde */
  { chm_nosuch,  0 },                   /* 0xdf */
  { chm_nosuch,  0 },                   /* 0xe0 */
  { chm_nosuch,  0 },                   /* 0xe1 */
  { chm_nosuch,  0 },                   /* 0xe2 */
  { chm_nosuch,  0 },                   /* 0xe3 */
  { chm_nosuch,  0 },                   /* 0xe4 */
  { chm_nosuch,  0 },                   /* 0xe5 */
  { chm_nosuch,  0 },                   /* 0xe6 */
  { chm_nosuch,  0 },                   /* 0xe7 */
  { chm_nosuch,  0 },                   /* 0xe8 */
  { chm_nosuch,  0 },                   /* 0xe9 */
  { chm_nosuch,  0 },                   /* 0xea */
  { chm_nosuch,  0 },                   /* 0xeb */
  { chm_nosuch,  0 },                   /* 0xec */
  { chm_nosuch,  0 },                   /* 0xed */
  { chm_nosuch,  0 },                   /* 0xee */
  { chm_nosuch,  0 },                   /* 0xef */
  { chm_nosuch,  0 },                   /* 0xf0 */
  { chm_nosuch,  0 },                   /* 0xf1 */
  { chm_nosuch,  0 },                   /* 0xf2 */
  { chm_nosuch,  0 },                   /* 0xf3 */
  { chm_nosuch,  0 },                   /* 0xf4 */
  { chm_nosuch,  0 },                   /* 0xf5 */
  { chm_nosuch,  0 },                   /* 0xf6 */
  { chm_nosuch,  0 },                   /* 0xf7 */
  { chm_nosuch,  0 },                   /* 0xf8 */
  { chm_nosuch,  0 },                   /* 0xf9 */
  { chm_nosuch,  0 },                   /* 0xfa */
  { chm_nosuch,  0 },                   /* 0xfb */
  { chm_nosuch,  0 },                   /* 0xfc */
  { chm_nosuch,  0 },                   /* 0xfd */
  { chm_nosuch,  0 },                   /* 0xfe */
  { chm_nosuch,  0 },                   /* 0xff */
};

/* get_channel_access()
 *
 * inputs       - pointer to Client struct
 *              - pointer to Membership struct
 * output       - CHACCESS_CHANOP if we should let them have
 *                chanop level access, 0 for peon level access.
 * side effects - NONE
 */
static int
get_channel_access(const struct Client *source_p,
                   const struct Membership *member)
{
  /* Let hacked servers in for now... */
  if (!MyClient(source_p))
    return CHACCESS_REMOTE;

  if (!member)
    return CHACCESS_NOTONCHAN;

  /* Just to be sure.. */
  assert(source_p == member->client_p);

  if (has_member_flags(member, CHFL_CHANOP))
    return CHACCESS_CHANOP;

  if (has_member_flags(member, CHFL_HALFOP))
    return CHACCESS_HALFOP;

  return CHACCESS_PEON;
}

/* send_mode_changes_server()
 * Input: the source client(source_p),
 *        the channel to send mode changes for(chptr)
 * Output: None.
 * Side-effects: Sends the appropriate mode changes to servers.
 *
 */
static void
send_mode_changes_server(struct Client *source_p, struct Channel *chptr)
{
  int mbl = 0, pbl = 0, arglen = 0, nc = 0, mc = 0;
  int len = 0;
  int dir = MODE_QUERY;
  const char *arg = NULL;
  char *parptr = NULL;

  parabuf[0] = '\0';
  parptr = parabuf;

  mbl = snprintf(modebuf, sizeof(modebuf), ":%s TMODE %ju %s ", source_p->id,
                 chptr->creationtime, chptr->name);

  /* Loop the list of modes we have */
  for (unsigned int i = 0; i < mode_count; ++i)
  {
    if (mode_changes[i].letter == 0)
      continue;

    if (mode_changes[i].id)
      arg = mode_changes[i].id;
    else
      arg = mode_changes[i].arg;

    if (arg)
      arglen = strlen(arg);
    else
      arglen = 0;

    /*
     * If we're creeping past the buf size, we need to send it and make
     * another line for the other modes
     */
    if ((mc == MAXMODEPARAMS) ||
        ((arglen + mbl + pbl + 2) > IRCD_BUFSIZE) ||
        (pbl + arglen + BAN_FUDGE) >= MODEBUFLEN)
    {
      if (nc)
        sendto_server(source_p, 0, 0, "%s %s", modebuf, parabuf);

      nc = 0;
      mc = 0;

      mbl = snprintf(modebuf, sizeof(modebuf), ":%s TMODE %ju %s ", source_p->id,
                     chptr->creationtime, chptr->name);

      pbl = 0;
      parabuf[0] = '\0';
      parptr = parabuf;
      dir = MODE_QUERY;
    }

    if (dir != mode_changes[i].dir)
    {
      modebuf[mbl++] = (mode_changes[i].dir == MODE_ADD) ? '+' : '-';
      dir = mode_changes[i].dir;
    }

    modebuf[mbl++] = mode_changes[i].letter;
    modebuf[mbl] = '\0';
    ++nc;

    if (arg)
    {
      len = sprintf(parptr, "%s ", arg);
      pbl += len;
      parptr += len;
      ++mc;
    }
  }

  if (pbl && parabuf[pbl - 1] == ' ')
    parabuf[pbl - 1] = '\0';

  if (nc)
    sendto_server(source_p, 0, 0, "%s %s", modebuf, parabuf);
}

/* void send_mode_changes(struct Client *client_p,
 *                        struct Client *source_p,
 *                        struct Channel *chptr)
 * Input: The client sending(client_p), the source client(source_p),
 *        the channel to send mode changes for(chptr),
 *        mode change globals.
 * Output: None.
 * Side-effects: Sends the appropriate mode changes to other clients
 *               and propagates to servers.
 */
/* ensure parabuf < MODEBUFLEN -db */
static void
send_mode_changes_client(struct Client *source_p, struct Channel *chptr)
{
  int mbl = 0, pbl = 0, arglen = 0, nc = 0, mc = 0;
  int len = 0;
  int dir = MODE_QUERY;
  const char *arg = NULL;
  char *parptr = NULL;

  if (IsServer(source_p))
    mbl = snprintf(modebuf, sizeof(modebuf), ":%s MODE %s ", (IsHidden(source_p) ||
                   ConfigServerHide.hide_servers) ?
                   me.name : source_p->name, chptr->name);
  else
    mbl = snprintf(modebuf, sizeof(modebuf), ":%s!%s@%s MODE %s ", source_p->name,
                   source_p->username, source_p->host, chptr->name);

  parabuf[0] = '\0';
  parptr = parabuf;

  for (unsigned int i = 0; i < mode_count; ++i)
  {
    if (mode_changes[i].letter == 0)
      continue;

    arg = mode_changes[i].arg;
    if (arg)
      arglen = strlen(arg);
    else
      arglen = 0;

    if ((mc == MAXMODEPARAMS) ||
        ((arglen + mbl + pbl + 2) > IRCD_BUFSIZE) ||
        ((arglen + pbl + BAN_FUDGE) >= MODEBUFLEN))
    {
      if (mbl && modebuf[mbl - 1] == '-')
        modebuf[mbl - 1] = '\0';

      if (nc)
        sendto_channel_local(NULL, chptr, 0, 0, 0, "%s %s", modebuf, parabuf);

      nc = 0;
      mc = 0;

      if (IsServer(source_p))
        mbl = snprintf(modebuf, sizeof(modebuf), ":%s MODE %s ", (IsHidden(source_p) ||
                       ConfigServerHide.hide_servers) ?
                       me.name : source_p->name, chptr->name);
      else
        mbl = snprintf(modebuf, sizeof(modebuf), ":%s!%s@%s MODE %s ", source_p->name,
                       source_p->username, source_p->host, chptr->name);

      pbl = 0;
      parabuf[0] = '\0';
      parptr = parabuf;
      dir = MODE_QUERY;
    }

    if (dir != mode_changes[i].dir)
    {
      modebuf[mbl++] = (mode_changes[i].dir == MODE_ADD) ? '+' : '-';
      dir = mode_changes[i].dir;
    }

    modebuf[mbl++] = mode_changes[i].letter;
    modebuf[mbl] = '\0';
    ++nc;

    if (arg)
    {
      len = sprintf(parptr, "%s ", arg);
      pbl += len;
      parptr += len;
      ++mc;
    }
  }

  if (pbl && parabuf[pbl - 1] == ' ')
    parabuf[pbl - 1] = '\0';

  if (nc)
    sendto_channel_local(NULL, chptr, 0, 0, 0, "%s %s", modebuf, parabuf);
}

/*
 * Input: The the client this originated
 *        from, the channel, the parameter count starting at the modes,
 *        the parameters, the channel name.
 * Output: None.
 * Side-effects: Changes the channel membership and modes appropriately,
 *               sends the appropriate MODE messages to the appropriate
 *               clients.
 */
void
set_channel_mode(struct Client *source_p, struct Channel *chptr,
                 struct Membership *member, int parc, char *parv[])
{
  int dir = MODE_ADD;
  int parn = 1;
  int alevel = 0, errors = 0;

  mode_count = 0;
  mode_limit = 0;
  simple_modes_mask = 0;

  alevel = get_channel_access(source_p, member);

  for (const char *ml = parv[0]; *ml; ++ml)
  {
    switch (*ml)
    {
      case '+':
        dir = MODE_ADD;
        break;
      case '-':
        dir = MODE_DEL;
        break;
      case '=':
        dir = MODE_QUERY;
        break;
      default:
      {
        const struct ChannelMode *tptr = &ModeTable[(unsigned char)*ml];

        tptr->func(source_p, chptr, parc, &parn, parv,
                   &errors, alevel, dir, *ml, tptr->d);
        break;
      }
    }
  }

  /* Bail out if we have nothing to do... */
  if (!mode_count)
    return;

  send_mode_changes_client(source_p, chptr);
  send_mode_changes_server(source_p, chptr);
}
Revision:	6858
Committed:	Sun Nov 29 18:28:53 2015 UTC (9 years, 8 months ago) by michael
Content type:	text/x-csrc
File size:	42584 byte(s)
Log Message:	- Added channel mode +T which forbids NOTICEs to be sent to a channel