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Code Issues Releases Wiki Activity
construct/ircd/channel.cc
Jason Volk 052a6c8d22 Refactor snomask.
2016-08-28 01:48:25 -07:00

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/*
* ircd-ratbox: A slightly useful ircd.
* channel.c: Controls channels.
*
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
* Copyright (C) 1996-2002 Hybrid Development Team
* Copyright (C) 2002-2005 ircd-ratbox development team
* Copyright (C) 2005-2016 Charybdis Development Team
* Copyright (C) 2016 Jason Volk <jason@zemos.net>
*
* 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
*/
using namespace ircd;
int h_can_join;
int h_can_send;
int h_get_channel_access;
struct config_channel_entry ircd::ConfigChannel;
std::map<const std::string *, std::unique_ptr<chan::chan>, rfc1459::less> chan::chans;
void
chan::init()
{
h_can_join = register_hook("can_join");
h_can_send = register_hook("can_send");
h_get_channel_access = register_hook("get_channel_access");
}
bool
chan::del(const chan &chan)
{
return del(name(chan));
}
bool
chan::del(const std::string &name)
{
return chans.erase(&name);
}
chan::chan &
chan::add(const std::string &name,
client::client &client)
{
if (name.empty())
throw err::BADCHANNAME("");
if (name.size() > CHANNELLEN && is_server(client))
sendto_realops_snomask(sno::DEBUG, L_ALL,
"*** Long channel name from %s (%lu > %d): %s",
client.name,
name.size(),
CHANNELLEN,
name.c_str());
if (name.size() > CHANNELLEN)
throw err::BADCHANNAME(name.c_str());
const auto it(chans.lower_bound(&name));
if (it != end(chans))
{
auto &chan(*it->second);
if (irccmp(chan.name, name) == 0)
return chan;
}
auto chan(std::make_unique<chan>(name));
const auto name_p(&chan->name);
const auto iit(chans.emplace_hint(it, name_p, std::move(chan)));
return *iit->second;
}
chan::chan &
chan::get(const std::string &name)
try
{
return *chans.at(&name);
}
catch(const std::out_of_range &e)
{
throw err::NOSUCHCHANNEL(name.c_str());
}
chan::chan *
chan::get(const std::string &name,
std::nothrow_t)
{
const auto it(chans.find(&name));
if (it == end(chans))
return nullptr;
const auto &ptr(it->second);
return ptr.get();
}
bool
chan::exists(const std::string &name)
{
return chans.count(&name);
}
chan::chan::chan(const std::string &name)
:name{name}
,mode{}
,mode_lock{}
,topic{}
,members{}
,join_count{0}
,join_delta{0}
,flood_noticed{0}
,received_number_of_privmsgs{0}
,first_received_message_time{0}
,last_knock{0}
,bants{0}
,channelts{rb_current_time()}
,last_checked_ts{0}
,last_checked_client{nullptr}
,last_checked_type{mode::type(0)}
,last_checked_result{0}
{
}
chan::chan::~chan()
noexcept
{
clear_invites(*this);
}
/* remove_user_from_channels()
*
* input - user to remove from all channels
* output -
* side effects - user is removed from all channels
*/
void
chan::del(client::client &client)
{
using client::user::chans;
for(const auto &pit : chans(user(client)))
{
auto &chan(*pit.first);
auto &member(*pit.second);
if (my(client))
chan.members.local.erase(member.lit);
chan.members.global.erase(member.git);
chan.invites.erase(&client);
if (empty(chan) && ~chan.mode & mode::PERMANENT)
del(chan);
}
chans(user(client)).clear();
invites(user(client)).clear();
}
void
chan::del(chan &chan,
client::client &client)
{
using client::user::chans;
auto &global(chan.members.global);
auto &local(chan.members.local);
const auto it(chans(user(client)).find(&chan));
if (it == end(chans(user(client))))
return;
auto &member(*it->second);
if (my(client))
chan.members.local.erase(member.lit);
chan.members.global.erase(member.git); // The member is destroyed at this point.
chans(user(client)).erase(it);
if (empty(chan) && ~chan.mode & mode::PERMANENT)
del(chan);
}
void
chan::add(chan &chan,
client::client &client,
const int &flags)
{
using client::user::chans;
if (!client.user)
{
s_assert(0);
return;
}
// These are the relevant containers.
auto &global(chan.members.global);
auto &local(chan.members.local);
// Add client to channel's global map
const auto iit(global.emplace(&client, flags));
if (!iit.second)
return;
// The global map hosts the membership structure.
auto &member(iit.first->second);
// Add iterator (pointer to the element) for constant time lookup/removal
member.git = iit.first;
// Add membership to a local list which can be iterated for local IO;
if (my(client))
member.lit = local.emplace(end(local), &member);
// Add channel to client's channel map, pointing to the membership;
chans(user(client)).emplace(&chan, &member);
}
chan::members::members()
{
}
chan::members::~members()
noexcept
{
}
chan::membership::membership(const uint &flags)
:flags{flags}
,bants{0}
{
}
chan::membership::~membership()
noexcept
{
}
chan::modes::modes()
:mode{0}
,limit{0}
,key{0}
,join_num{0}
,join_time{0}
,forward{0}
{
}
chan::ban::ban(const std::string &banstr,
const std::string &who,
const std::string &forward,
const time_t &when)
:banstr{banstr}
,who{who}
,forward{forward}
,when{when}
{
}
void
chan::send_join(chan &chan,
client::client &client)
{
if (!is_client(client))
return;
sendto_channel_local_with_capability(ALL_MEMBERS, NOCAPS, CLICAP_EXTENDED_JOIN, &chan,
":%s!%s@%s JOIN %s",
client.name,
client.username,
client.host,
chan.name.c_str());
sendto_channel_local_with_capability(ALL_MEMBERS, CLICAP_EXTENDED_JOIN, NOCAPS, &chan,
":%s!%s@%s JOIN %s %s :%s",
client.name,
client.username,
client.host,
chan.name.c_str(),
suser(user(client)).empty()? "*" : suser(user(client)).c_str(),
client.info);
// Send away message to away-notify enabled clients.
if (!away(user(client)).empty())
sendto_channel_local_with_capability_butone(&client, ALL_MEMBERS, CLICAP_AWAY_NOTIFY, NOCAPS, &chan,
":%s!%s@%s AWAY :%s",
client.name,
client.username,
client.host,
away(user(client)).c_str());
}
chan::membership &
chan::get(members &members,
const client::client &client)
{
if (!is_client(client))
throw invalid_argument();
const auto key(const_cast<client::client *>(&client));
const auto it(members.global.find(key));
if (it == end(members.global))
throw err::NOTONCHANNEL(client.name);
return it->second;
}
const chan::membership &
chan::get(const members &members,
const client::client &client)
{
if (!is_client(client))
throw invalid_argument();
const auto key(const_cast<client::client *>(&client));
const auto it(members.global.find(key));
if (it == end(members.global))
throw err::NOTONCHANNEL(client.name);
return it->second;
}
chan::membership *
chan::get(members &members,
const client::client &client,
std::nothrow_t)
{
if (!is_client(client))
return nullptr;
const auto key(const_cast<client::client *>(&client));
const auto it(members.global.find(key));
if (it == end(members.global))
return nullptr;
return &it->second;
}
const chan::membership *
chan::get(const members &members,
const client::client &client,
std::nothrow_t)
{
if (!is_client(client))
return nullptr;
const auto key(const_cast<client::client *>(&client));
const auto it(members.global.find(key));
if (it == end(members.global))
return nullptr;
return &it->second;
}
/* find_channel_status()
*
* input - membership to get status for, whether we can combine flags
* output - flags of user on channel
* side effects -
*/
const char *
chan::find_status(const membership *const &msptr,
const int &combine)
{
static char buffer[3];
char *p;
p = buffer;
if(is_chanop(msptr))
{
if(!combine)
return "@";
*p++ = '@';
}
if(is_voiced(msptr))
*p++ = '+';
*p = '\0';
return buffer;
}
/* invalidate_bancache_user()
*
* input - user to invalidate ban cache for
* output -
* side effects - ban cache is invalidated for all memberships of that user
* to be used after a nick change
*/
void
chan::invalidate_bancache_user(client::client *client)
{
using client::user::chans;
if(!client)
return;
for(const auto &pair : chans(user(*client)))
{
auto &chan(*pair.first);
auto &member(*pair.second);
member.bants = 0;
member.flags &= ~BANNED;
}
}
/* channel_pub_or_secret()
*
* input - channel
* output - "=" if public, "@" if secret, else "*"
* side effects -
*/
static const char *
channel_pub_or_secret(chan::chan *const &chptr)
{
return chan::is_public(chptr)? "=":
chan::is_secret(chptr)? "@":
"*";
}
/* channel_member_names()
*
* input - channel to list, client to list to, show endofnames
* output -
* side effects - client is given list of users on channel
*/
void
chan::channel_member_names(chan *chptr, client::client *client_p, int show_eon)
{
client::client *target_p;
rb_dlink_node *ptr;
char lbuf[BUFSIZE];
char *t;
int mlen;
int tlen;
int cur_len;
int stack = IsCapable(client_p, CLICAP_MULTI_PREFIX);
if(can_show(chptr, client_p))
{
cur_len = mlen = sprintf(lbuf, form_str(RPL_NAMREPLY),
me.name, client_p->name,
channel_pub_or_secret(chptr), chptr->name.c_str());
t = lbuf + cur_len;
for(const auto &pair : chptr->members.global)
{
auto *const target_p(pair.first);
const auto &member(pair.second);
if(is(*target_p, umode::INVISIBLE) && !is_member(chptr, client_p))
continue;
if (IsCapable(client_p, CLICAP_USERHOST_IN_NAMES))
{
/* space, possible "@+" prefix */
if (cur_len + strlen(target_p->name) + strlen(target_p->username) + strlen(target_p->host) + 5 >= BUFSIZE - 5)
{
*(t - 1) = '\0';
sendto_one(client_p, "%s", lbuf);
cur_len = mlen;
t = lbuf + mlen;
}
tlen = sprintf(t, "%s%s!%s@%s ", find_status(&member, stack),
target_p->name, target_p->username, target_p->host);
}
else
{
/* space, possible "@+" prefix */
if(cur_len + strlen(target_p->name) + 3 >= BUFSIZE - 3)
{
*(t - 1) = '\0';
sendto_one(client_p, "%s", lbuf);
cur_len = mlen;
t = lbuf + mlen;
}
tlen = sprintf(t, "%s%s ", find_status(&member, stack),
target_p->name);
}
cur_len += tlen;
t += tlen;
}
/* The old behaviour here was to always output our buffer,
* even if there are no clients we can show. This happens
* when a client does "NAMES" with no parameters, and all
* the clients on a -sp channel are +i. I dont see a good
* reason for keeping that behaviour, as it just wastes
* bandwidth. --anfl
*/
if(cur_len != mlen)
{
*(t - 1) = '\0';
sendto_one(client_p, "%s", lbuf);
}
}
if(show_eon)
sendto_one(client_p, form_str(RPL_ENDOFNAMES),
me.name, client_p->name, chptr->name.c_str());
}
void
chan::clear_invites(chan &chan)
{
for (auto &client : chan.invites)
invites(user(*client)).erase(&chan);
}
void
chan::del_invite(chan &chan, client::client &client)
{
chan.invites.erase(&client);
invites(user(client)).erase(&chan);
}
bool
chan::cache_check(const chan &chan,
const mode::type &type,
const client::client &who,
bool &result)
{
using namespace mode;
if (chan.last_checked_client != &who)
return false;
if (chan.last_checked_ts <= chan.bants)
return false;
switch (type)
{
case BAN:
case QUIET:
result = chan.last_checked_result;
return true;
default:
return false;
}
}
void
chan::cache_result(chan &chan,
const mode::type &type,
const client::client &client,
const bool &result,
membership *const &membership)
{
using namespace mode;
switch (type)
{
case BAN:
case QUIET:
break;
default:
return;
}
chan.last_checked_client = &client;
chan.last_checked_type = type;
chan.last_checked_result = result;
chan.last_checked_ts = rb_current_time();
if (membership)
{
membership->bants = chan.bants;
if (result)
membership->flags |= BANNED;
else
membership->flags &= ~BANNED;
}
}
bool
chan::check(chan &chan,
const mode::type &type,
const client::client &client,
check_data *const &data)
{
bool result;
if (cache_check(chan, type, client, result))
return result;
if (!my(client))
return false;
enum srcs { HOST, IPHOST, ALTHOST, IP4HOST, _NUM_ };
char src[num_of<srcs>()][NICKLEN + USERLEN + HOSTLEN + 6];
const char *s[num_of<srcs>()]
{
data? data->host : nullptr,
data? data->iphost : nullptr
};
// if the buffers havent been built, do it here
if (!s[HOST])
{
sprintf(src[HOST], "%s!%s@%s", client.name, client.username, client.host);
s[HOST] = src[HOST];
}
if (!s[IPHOST])
{
sprintf(src[IPHOST], "%s!%s@%s", client.name, client.username, client.sockhost);
s[IPHOST] = src[IPHOST];
}
if (client.localClient->mangledhost)
{
// if host mangling mode enabled, also check their real host
if (strcmp(client.host, client.localClient->mangledhost) == 0)
{
sprintf(src[ALTHOST], "%s!%s@%s", client.name, client.username, client.orighost);
s[ALTHOST] = src[ALTHOST];
}
// if host mangling mode not enabled and no other spoof, check the mangled form of their host
else if (!is_dyn_spoof(client))
{
sprintf(src[ALTHOST], "%s!%s@%s", client.name, client.username, client.localClient->mangledhost);
s[ALTHOST] = src[ALTHOST];
}
}
#ifdef RB_IPV6
struct sockaddr_in ip4;
if (GET_SS_FAMILY(&client.localClient->ip) == AF_INET6 &&
rb_ipv4_from_ipv6((const struct sockaddr_in6 *)&client.localClient->ip, &ip4))
{
sprintf(src[IP4HOST], "%s!%s@", client.name, client.username);
char *const pos(src[IP4HOST] + strlen(src[IP4HOST]));
rb_inet_ntop_sock((struct sockaddr *)&ip4, pos, src[IP4HOST] + sizeof(src[IP4HOST]) - pos);
s[IP4HOST] = src[IP4HOST];
}
#endif
const auto matched([&s, &chan, &client]
(const ban &ban)
{
const auto &mask(ban.banstr);
if (match(mask, s[HOST]))
return true;
if (match(mask, s[IPHOST]))
return true;
if (match_cidr(mask, s[IPHOST]))
return true;
if (s[ALTHOST] && match(mask, s[ALTHOST]))
return true;
if (match_extban(mask.c_str(), const_cast<client::client *>(&client), &chan, mode::BAN))
return true;
#ifdef RB_IPV6
if (s[IP4HOST] && match(mask, s[IP4HOST]))
return true;
if (s[IP4HOST] && match_cidr(mask, s[IP4HOST]))
return true;
#endif
return false;
});
const auto &list(get(chan, type));
const auto it(std::find_if(begin(list), end(list), matched));
const auto msptr(data? data->msptr : nullptr);
result = it != end(list);
if (result && ircd::ConfigChannel.use_except)
{
const auto &list(get(chan, mode::EXCEPTION));
if (std::any_of(begin(list), end(list), matched))
{
cache_result(chan, type, client, false, msptr);
return false;
}
}
if (result && data && data->forward)
{
const auto &ban(*it);
if (!ban.forward.empty())
*data->forward = ban.forward.c_str(); //TODO: XXX: ???
}
cache_result(chan, type, client, result, msptr);
return result;
}
/* can_join()
*
* input - client to check, channel to check for, key
* output - reason for not being able to join, else 0, channel name to forward to
* side effects -
* caveats - this function should only be called on a local user.
*/
int
chan::can_join(client::client *source_p, chan *chptr, const char *key, const char **forward)
{
rb_dlink_node *ptr;
bool invited(false);
ban *invex = NULL;
char src_host[NICKLEN + USERLEN + HOSTLEN + 6];
char src_iphost[NICKLEN + USERLEN + HOSTLEN + 6];
char src_althost[NICKLEN + USERLEN + HOSTLEN + 6];
int use_althost = 0;
int i = 0;
hook_data_channel moduledata;
s_assert(source_p->localClient != NULL);
moduledata.client = source_p;
moduledata.chptr = chptr;
moduledata.approved = 0;
sprintf(src_host, "%s!%s@%s", source_p->name, source_p->username, source_p->host);
sprintf(src_iphost, "%s!%s@%s", source_p->name, source_p->username, source_p->sockhost);
if(source_p->localClient->mangledhost != NULL)
{
/* if host mangling mode enabled, also check their real host */
if(!strcmp(source_p->host, source_p->localClient->mangledhost))
{
sprintf(src_althost, "%s!%s@%s", source_p->name, source_p->username, source_p->orighost);
use_althost = 1;
}
/* if host mangling mode not enabled and no other spoof,
* also check the mangled form of their host */
else if (!is_dyn_spoof(*source_p))
{
sprintf(src_althost, "%s!%s@%s", source_p->name, source_p->username, source_p->localClient->mangledhost);
use_althost = 1;
}
}
check_data data
{
nullptr,
src_host,
src_iphost,
forward
};
if (check(*chptr, mode::BAN, *source_p, &data))
{
moduledata.approved = ERR_BANNEDFROMCHAN;
goto finish_join_check;
}
if (*chptr->mode.key && (EmptyString(key) || irccmp(chptr->mode.key, key)))
{
moduledata.approved = ERR_BADCHANNELKEY;
goto finish_join_check;
}
/* All checks from this point on will forward... */
if (forward)
*forward = chptr->mode.forward;
if (chptr->mode.mode & mode::INVITEONLY)
{
if (!(invited = chptr->invites.count(source_p)))
{
if (!ConfigChannel.use_invex)
moduledata.approved = ERR_INVITEONLYCHAN;
const auto &list(get(*chptr, mode::INVEX));
const bool matched(std::any_of(begin(list), end(list), [&]
(const auto &ban)
{
const auto &mask(ban.banstr);
if (match(mask, src_host))
return true;
if (match(mask, src_iphost))
return true;
if (match_cidr(mask, src_iphost))
return true;
if (match_extban(mask.c_str(), source_p, chptr, mode::INVEX))
return true;
if (use_althost && match(mask, src_althost))
return true;
return false;
}));
if (!matched)
moduledata.approved = ERR_INVITEONLYCHAN;
}
}
if(chptr->mode.limit && size(chptr->members) >= ulong(chptr->mode.limit))
i = ERR_CHANNELISFULL;
if(chptr->mode.mode & mode::REGONLY && suser(user(*source_p)).empty())
i = ERR_NEEDREGGEDNICK;
/* join throttling stuff --nenolod */
else if(chptr->mode.join_num > 0 && chptr->mode.join_time > 0)
{
if ((rb_current_time() - chptr->join_delta <=
chptr->mode.join_time) && (chptr->join_count >=
chptr->mode.join_num))
i = ERR_THROTTLE;
}
/* allow /invite to override +l/+r/+j also -- jilles */
if (i != 0 && !invited)
{
if (!(invited = chptr->invites.count(source_p)))
moduledata.approved = i;
}
finish_join_check:
call_hook(h_can_join, &moduledata);
return moduledata.approved;
}
/* can_send()
*
* input - user to check in channel, membership pointer
* output - whether can explicitly send or not, else CAN_SEND_NONOP
* side effects -
*/
int
chan::can_send(chan *chptr, client::client *source_p, membership *msptr)
{
hook_data_channel_approval moduledata;
moduledata.approved = CAN_SEND_NONOP;
moduledata.dir = MODE_QUERY;
if(is_server(*source_p) || is(*source_p, umode::SERVICE))
return CAN_SEND_OPV;
if(my(*source_p) && hash_find_resv(chptr->name.c_str()) &&
!is(*source_p, umode::OPER) && !is_exempt_resv(*source_p))
moduledata.approved = CAN_SEND_NO;
if(msptr == NULL)
{
msptr = get(chptr->members, *source_p, std::nothrow);
if(msptr == NULL)
{
/* if its +m or +n and theyre not in the channel,
* they cant send. we dont check bans here because
* theres no possibility of caching them --fl
*/
if(chptr->mode.mode & mode::NOPRIVMSGS || chptr->mode.mode & mode::MODERATED)
moduledata.approved = CAN_SEND_NO;
else
moduledata.approved = CAN_SEND_NONOP;
return moduledata.approved;
}
}
if(chptr->mode.mode & mode::MODERATED)
moduledata.approved = CAN_SEND_NO;
if(my(*source_p))
{
/* cached can_send */
if(msptr->bants == chptr->bants)
{
if(can_send_banned(msptr))
moduledata.approved = CAN_SEND_NO;
} else {
check_data data
{
msptr
};
if (check(*chptr, mode::BAN, *source_p, &data))
moduledata.approved = CAN_SEND_NO;
if (check(*chptr, mode::QUIET, *source_p, &data))
moduledata.approved = CAN_SEND_NO;
}
}
if (is_chanop(msptr) || is_voiced(msptr))
moduledata.approved = CAN_SEND_OPV;
moduledata.client = source_p;
moduledata.chptr = chptr;
moduledata.msptr = msptr;
moduledata.target = NULL;
moduledata.dir = moduledata.approved == CAN_SEND_NO? MODE_ADD : MODE_QUERY;
call_hook(h_can_send, &moduledata);
return moduledata.approved;
}
/*
* flood_attack_channel
* inputs - flag 0 if PRIVMSG 1 if NOTICE. RFC
* says NOTICE must not auto reply
* - pointer to source Client
* - pointer to target channel
* output - true if target is under flood attack
* side effects - check for flood attack on target chptr
*/
bool
chan::flood_attack_channel(int p_or_n, client::client *source_p, chan *chptr)
{
int delta;
if(GlobalSetOptions.floodcount && my(*source_p))
{
if((chptr->first_received_message_time + 1) < rb_current_time())
{
delta = rb_current_time() - chptr->first_received_message_time;
chptr->received_number_of_privmsgs -= delta;
chptr->first_received_message_time = rb_current_time();
if(chptr->received_number_of_privmsgs <= 0)
{
chptr->received_number_of_privmsgs = 0;
chptr->flood_noticed = 0;
}
}
if((chptr->received_number_of_privmsgs >= GlobalSetOptions.floodcount)
|| chptr->flood_noticed)
{
if(chptr->flood_noticed == 0)
{
sendto_realops_snomask(sno::BOTS, chptr->name[0] == '&' ? L_ALL : L_NETWIDE,
"Possible Flooder %s[%s@%s] on %s target: %s",
source_p->name, source_p->username,
source_p->orighost,
source_p->servptr->name, chptr->name.c_str());
chptr->flood_noticed = 1;
/* Add a bit of penalty */
chptr->received_number_of_privmsgs += 2;
}
if(my(*source_p) && (p_or_n != 1))
sendto_one(source_p,
":%s NOTICE %s :*** Message to %s throttled due to flooding",
me.name, source_p->name, chptr->name.c_str());
return true;
}
else
chptr->received_number_of_privmsgs++;
}
return false;
}
/* find_bannickchange_channel()
* Input: client to check
* Output: channel preventing nick change
*/
chan::chan *
chan::find_bannickchange_channel(client::client *client_p)
{
using client::user::chans;
chan *chptr;
membership *msptr;
rb_dlink_node *ptr;
char src_host[NICKLEN + USERLEN + HOSTLEN + 6];
char src_iphost[NICKLEN + USERLEN + HOSTLEN + 6];
if (!my(*client_p))
return NULL;
sprintf(src_host, "%s!%s@%s", client_p->name, client_p->username, client_p->host);
sprintf(src_iphost, "%s!%s@%s", client_p->name, client_p->username, client_p->sockhost);
for(const auto &pit : chans(user(*client_p)))
{
auto &chptr(pit.first);
auto &msptr(pit.second);
if (is_chanop(msptr) || is_voiced(msptr))
continue;
/* cached can_send */
if (msptr->bants == chptr->bants)
{
if (can_send_banned(msptr))
return chptr;
} else {
check_data data
{
msptr,
src_host,
src_iphost,
};
if (check(*chptr, mode::BAN, *client_p, &data))
return chptr;
if (check(*chptr, mode::QUIET, *client_p, &data))
return chptr;
}
}
return NULL;
}
/* void check_spambot_warning(client::client *source_p)
* Input: Client to check, channel name or NULL if this is a part.
* Output: none
* Side-effects: Updates the client's oper_warn_count_down, warns the
* IRC operators if necessary, and updates join_leave_countdown as
* needed.
*/
void
chan::check_spambot_warning(client::client *source_p, const char *name)
{
int t_delta;
int decrement_count;
if((GlobalSetOptions.spam_num &&
(source_p->localClient->join_leave_count >= GlobalSetOptions.spam_num)))
{
if(source_p->localClient->oper_warn_count_down > 0)
source_p->localClient->oper_warn_count_down--;
else
source_p->localClient->oper_warn_count_down = 0;
if(source_p->localClient->oper_warn_count_down == 0 &&
name != NULL)
{
/* Its already known as a possible spambot */
sendto_realops_snomask(sno::BOTS, L_NETWIDE,
"User %s (%s@%s) trying to join %s is a possible spambot",
source_p->name,
source_p->username, source_p->orighost, name);
source_p->localClient->oper_warn_count_down = OPER_SPAM_COUNTDOWN;
}
}
else
{
if((t_delta =
(rb_current_time() - source_p->localClient->last_leave_time)) >
JOIN_LEAVE_COUNT_EXPIRE_TIME)
{
decrement_count = (t_delta / JOIN_LEAVE_COUNT_EXPIRE_TIME);
if(name != NULL)
;
else if(decrement_count > source_p->localClient->join_leave_count)
source_p->localClient->join_leave_count = 0;
else
source_p->localClient->join_leave_count -= decrement_count;
}
else
{
if((rb_current_time() -
(source_p->localClient->last_join_time)) < GlobalSetOptions.spam_time)
{
/* oh, its a possible spambot */
source_p->localClient->join_leave_count++;
}
}
if(name != NULL)
source_p->localClient->last_join_time = rb_current_time();
else
source_p->localClient->last_leave_time = rb_current_time();
}
}
/* check_splitmode()
*
* input -
* output -
* side effects - compares usercount and servercount against their split
* values and adjusts splitmode accordingly
*/
void
chan::check_splitmode(void *unused)
{
if(splitchecking && (ConfigChannel.no_join_on_split || ConfigChannel.no_create_on_split))
{
/* not split, we're being asked to check now because someone
* has left
*/
if(!splitmode)
{
if(eob_count < split_servers || Count.total < split_users)
{
splitmode = 1;
sendto_realops_snomask(sno::GENERAL, L_ALL,
"Network split, activating splitmode");
check_splitmode_ev = rb_event_addish("check_splitmode", check_splitmode, NULL, 2);
}
}
/* in splitmode, check whether its finished */
else if(eob_count >= split_servers && Count.total >= split_users)
{
splitmode = 0;
sendto_realops_snomask(sno::GENERAL, L_ALL,
"Network rejoined, deactivating splitmode");
rb_event_delete(check_splitmode_ev);
check_splitmode_ev = NULL;
}
}
}
/* set_channel_topic()
*
* input - channel, topic to set, topic info and topic ts
* output -
* side effects - channels topic, topic info and TS are set.
*/
void
chan::set_channel_topic(chan *chptr, const char *topic, const char *topic_info, time_t topicts)
{
//TODO: XXX: is the topic* len previously truncated at TOPICLEN
//TODO: XXX: is the topc_info* previously truncated at USERHOST_REPLYLEN
if(strlen(topic) > 0)
{
chptr->topic.text = topic;
chptr->topic.info = topic_info;
chptr->topic.time = topicts;
}
else
{
chptr->topic.text.clear();
chptr->topic.info.clear();
chptr->topic.time = 0;
}
}
/* channel_modes()
*
* inputs - pointer to channel
* - pointer to client
* output - string with simple modes
* side effects - result from previous calls overwritten
*
* Stolen from ShadowIRCd 4 --nenolod
*/
const char *
chan::channel_modes(chan *chptr, client::client *client_p)
{
int i;
char buf1[BUFSIZE];
char buf2[BUFSIZE];
static char final[BUFSIZE];
char *mbuf = buf1;
char *pbuf = buf2;
*mbuf++ = '+';
*pbuf = '\0';
for (i = 0; i < 256; i++)
{
if(mode::table[i].set_func == mode::functor::hidden && (!is(*client_p, umode::OPER) || !is_client(*client_p)))
continue;
if(chptr->mode.mode & mode::table[i].type)
*mbuf++ = i;
}
if(chptr->mode.limit)
{
*mbuf++ = 'l';
if(!is_client(*client_p) || is_member(chptr, client_p))
pbuf += sprintf(pbuf, " %d", chptr->mode.limit);
}
if(*chptr->mode.key)
{
*mbuf++ = 'k';
if(pbuf > buf2 || !is_client(*client_p) || is_member(chptr, client_p))
pbuf += sprintf(pbuf, " %s", chptr->mode.key);
}
if(chptr->mode.join_num)
{
*mbuf++ = 'j';
if(pbuf > buf2 || !is_client(*client_p) || is_member(chptr, client_p))
pbuf += sprintf(pbuf, " %d:%d", chptr->mode.join_num,
chptr->mode.join_time);
}
if(*chptr->mode.forward &&
(ConfigChannel.use_forward || !is_client(*client_p)))
{
*mbuf++ = 'f';
if(pbuf > buf2 || !is_client(*client_p) || is_member(chptr, client_p))
pbuf += sprintf(pbuf, " %s", chptr->mode.forward);
}
*mbuf = '\0';
rb_strlcpy(final, buf1, sizeof final);
rb_strlcat(final, buf2, sizeof final);
return final;
}
/* void send_cap_mode_changes(client::client *client_p,
* client::client *source_p,
* chan *chptr, int cap, int nocap)
* Input: The client sending(client_p), the source client(source_p),
* the channel to send mode changes for(chptr)
* Output: None.
* Side-effects: Sends the appropriate mode changes to capable servers.
*
* Reverted back to my original design, except that we now keep a count
* of the number of servers which each combination as an optimisation, so
* the capabs combinations which are not needed are not worked out. -A1kmm
*
* Removed most code here because we don't need to be compatible with ircd
* 2.8.21+CSr and stuff. --nenolod
*/
void
chan::send_cap_mode_changes(client::client *client_p, client::client *source_p,
chan *chptr, mode::change mode_changes[], int mode_count)
{
static char modebuf[BUFSIZE];
static char parabuf[BUFSIZE];
int i, mbl, pbl, nc, mc, preflen, len;
char *pbuf;
const char *arg;
int dir;
int arglen = 0;
/* Now send to servers... */
mc = 0;
nc = 0;
pbl = 0;
parabuf[0] = 0;
pbuf = parabuf;
dir = MODE_QUERY;
mbl = preflen = sprintf(modebuf, ":%s TMODE %ld %s ",
use_id(source_p), (long) chptr->channelts,
chptr->name.c_str());
/* loop the list of - modes we have */
for (i = 0; i < mode_count; i++)
{
/* if they dont support the cap we need, or they do support a cap they
* cant have, then dont add it to the modebuf.. that way they wont see
* the mode
*/
if (mode_changes[i].letter == 0)
continue;
if (!EmptyString(mode_changes[i].id))
arg = mode_changes[i].id;
else
arg = mode_changes[i].arg;
if(arg)
{
arglen = strlen(arg);
/* dont even think about it! --fl */
if(arglen > mode::BUFLEN - 5)
continue;
}
/* if we're creeping past the buf size, we need to send it and make
* another line for the other modes
* XXX - this could give away server topology with uids being
* different lengths, but not much we can do, except possibly break
* them as if they were the longest of the nick or uid at all times,
* which even then won't work as we don't always know the uid -A1kmm.
*/
if(arg && ((mc == mode::MAXPARAMSSERV) ||
((mbl + pbl + arglen + 4) > (BUFSIZE - 3))))
{
if(nc != 0)
sendto_server(client_p, chptr, NOCAPS, NOCAPS,
"%s %s", modebuf, parabuf);
nc = 0;
mc = 0;
mbl = preflen;
pbl = 0;
pbuf = parabuf;
parabuf[0] = 0;
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 != NULL)
{
len = sprintf(pbuf, "%s ", arg);
pbuf += len;
pbl += len;
mc++;
}
}
if(pbl && parabuf[pbl - 1] == ' ')
parabuf[pbl - 1] = 0;
if(nc != 0)
sendto_server(client_p, chptr, NOCAPS, NOCAPS, "%s %s", modebuf, parabuf);
}
void
chan::resv_chan_forcepart(const char *name, const char *reason, int temp_time)
{
rb_dlink_node *ptr;
rb_dlink_node *next_ptr;
chan *chptr;
membership *msptr;
client::client *target_p;
if(!ConfigChannel.resv_forcepart)
return;
/* for each user on our server in the channel list
* send them a PART, and notify opers.
*/
chptr = get(name, std::nothrow);
if(chptr != NULL)
{
// Iterate a copy of the local list while all of this is going on
auto local(chptr->members.local);
for(auto &msptr : local)
{
const auto target_p(msptr->git->first);
if(is_exempt_resv(*target_p))
continue;
sendto_server(target_p, chptr, CAP_TS6, NOCAPS,
":%s PART %s", target_p->id, chptr->name.c_str());
sendto_channel_local(ALL_MEMBERS, chptr, ":%s!%s@%s PART %s :%s",
target_p->name, target_p->username,
target_p->host, chptr->name.c_str(), target_p->name);
del(*chptr, *target_p);
/* notify opers & user they were removed from the channel */
sendto_realops_snomask(sno::GENERAL, L_ALL,
"Forced PART for %s!%s@%s from %s (%s)",
target_p->name, target_p->username,
target_p->host, name, reason);
if(temp_time > 0)
sendto_one_notice(target_p, ":*** Channel %s is temporarily unavailable on this server.",
name);
else
sendto_one_notice(target_p, ":*** Channel %s is no longer available on this server.",
name);
}
}
}
bool
chan::add(chan &chan,
const mode::type &type,
const std::string &mask,
client::client &source,
const std::string &forward)
{
// dont let local clients overflow the banlist, or set redundant bans
if (my(source))
{
const bool large(chan.mode & mode::EXLIMIT);
const size_t &max(large? ConfigChannel.max_bans_large : ConfigChannel.max_bans);
if (lists_size(chan) > max)
{
sendto_one(&source, form_str(ERR_BANLISTFULL),
me.name,
source.name,
chan.name.c_str(),
mask.c_str());
return false;
}
const auto matches([&mask](const ban &ban)
{
return match_mask(ban.banstr, mask);
});
const auto &list(get(chan, type));
if (std::any_of(begin(list), end(list), matches))
return false;
}
auto &list(get(chan, type));
auto insertion(list.emplace(mask, std::string{}, forward, rb_current_time()));
if (!insertion.second)
return false;
auto &ban(const_cast<struct ban &>(*insertion.first));
if (is_person(source))
{
static char who[USERHOST_REPLYLEN];
snprintf(who, sizeof(who), "%s!%s@%s", source.name, source.username, source.host);
ban.who = who;
}
else ban.who = source.name;
cache_invalidate(chan, type, ban.when);
return true;
}
bool
chan::del(chan &chan,
const mode::type &type,
const std::string &mask)
{
if (mask.empty())
return false;
auto &list(get(chan, type));
if (!list.erase(mask))
return false;
cache_invalidate(chan, type);
return true;
}
const chan::ban &
chan::get(const chan &chan,
const mode::type &type,
const std::string &mask)
{
const auto &list(get(chan, type));
const auto &it(list.find(mask));
if (it == end(list))
throw not_found();
return *it;
}
void
chan::cache_invalidate(chan &chan,
const mode::type &type,
time_t time)
{
using namespace mode;
if (!time)
time = rb_current_time();
switch (type)
{
case BAN:
case QUIET:
case EXCEPTION:
chan.bants = time;
break;
default:
break;
}
}
size_t
chan::lists_size(const chan &chan)
{
using namespace mode;
return size(chan, BAN) +
size(chan, EXCEPTION) +
size(chan, INVEX) +
size(chan, QUIET);
}
size_t
chan::size(const chan &chan,
const mode::type &type)
{
return get(chan, type).size();
}
bool
chan::empty(const chan &chan,
const mode::type &type)
{
return get(chan, type).empty();
}
chan::list &
chan::get(chan &chan,
const mode::type &type)
{
using namespace mode;
switch (type)
{
case BAN: return chan.bans;
case EXCEPTION: return chan.excepts;
case INVEX: return chan.invexs;
case QUIET: return chan.quiets;
default:
throw invalid_list();
}
}
const chan::list &
chan::get(const chan &chan,
const mode::type &type)
{
using namespace mode;
switch (type)
{
case BAN: return chan.bans;
case EXCEPTION: return chan.excepts;
case INVEX: return chan.invexs;
case QUIET: return chan.quiets;
default:
throw invalid_list();
}
}
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