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construct/modules/m_nick.cc
Jason Volk 9d0a959bb5 MAPI IV. This iteration leverages the C++11 standardized RTTI. 
* Simplifies the export declarations for module developers. While
MAPI III utilized a flexible key-value vector to eliminate positional
arguments in a header initializer, now the developer simply makes
a list of pointers to what they want to export for injection into
IRCd. Example:

mapi::header IRCD_MODULE
{
	"mymod",
	"My module adds a command, a hook, and a CLICAP",
	&my_cmdtab,
	&some_hook,
	&clicaptab
};

* Distributes the handlers for items passed to the above vector.
Anyone can add a type-handler to the module system from anywhere in IRCd
(and other modules?) When your type is encountered a handler is called
providing the symbol name to read out of the module. Example in parser.cc:

mods::add_loader<Message>([]
(mod &loading, const std::string &symbol)
{
	auto &msg(get<Message>(loading, symbol));
	add_command(msg.name, msg);
});
2016-09-09 16:17:01 -07:00

1173 lines
32 KiB
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/*
* ircd-ratbox: A slightly useful ircd.
* m_nick.c: Sets a users nick.
*
* 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
*
* 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;
/* Give all UID nicks the same TS. This ensures nick TS is always the same on
* all servers for each nick-user pair, also if a user with a UID nick changes
* their nick but is collided again (the server detecting the collision will
* not propagate the nick change further). -- jilles
*/
#define SAVE_NICKTS 100
static void mr_nick(struct MsgBuf *, client::client &, client::client &, int, const char **);
static void m_nick(struct MsgBuf *, client::client &, client::client &, int, const char **);
static void mc_nick(struct MsgBuf *, client::client &, client::client &, int, const char **);
static void ms_nick(struct MsgBuf *, client::client &, client::client &, int, const char **);
static void ms_uid(struct MsgBuf *, client::client &, client::client &, int, const char **);
static void ms_euid(struct MsgBuf *, client::client &, client::client &, int, const char **);
static void ms_save(struct MsgBuf *, client::client &, client::client &, int, const char **);
static bool can_save(client::client *);
static void save_user(client::client &, client::client &, client::client *);
static void bad_nickname(client::client &, const char *);
static void change_remote_nick(client::client &, client::client &, time_t,
const char *, int);
static bool clean_username(const char *);
static bool clean_host(const char *);
static bool clean_uid(const char *uid, const char *sid);
static void set_initial_nick(client::client &client, client::client &source, char *nick);
static void change_local_nick(client::client &client, client::client &source, char *nick, int);
static void register_client(client::client &client, client::client *server,
const char *nick, time_t newts, int parc, const char *parv[]);
static void perform_nick_collides(client::client &, client::client &,
client::client *, int, const char **,
time_t, const char *, const char *);
static void perform_nickchange_collides(client::client &, client::client &,
client::client *, int, const char **, time_t, const char *);
struct Message nick_msgtab = {
"NICK", 0, 0, 0, 0,
{{mr_nick, 0}, {m_nick, 0}, {mc_nick, 3}, {ms_nick, 0}, mg_ignore, {m_nick, 0}}
};
struct Message uid_msgtab = {
"UID", 0, 0, 0, 0,
{mg_ignore, mg_ignore, mg_ignore, {ms_uid, 9}, mg_ignore, mg_ignore}
};
struct Message euid_msgtab = {
"EUID", 0, 0, 0, 0,
{mg_ignore, mg_ignore, mg_ignore, {ms_euid, 12}, mg_ignore, mg_ignore}
};
struct Message save_msgtab = {
"SAVE", 0, 0, 0, 0,
{mg_ignore, mg_ignore, mg_ignore, {ms_save, 3}, mg_ignore, mg_ignore}
};
mapi_clist_av1 nick_clist[] = { &nick_msgtab, &uid_msgtab, &euid_msgtab,
&save_msgtab, NULL };
static const char nick_desc[] =
"Provides the NICK client and server commands as well as the UID, EUID, and SAVE TS6 server commands";
DECLARE_MODULE_AV2(nick, NULL, NULL, nick_clist, NULL, NULL, NULL, NULL, nick_desc);
/* mr_nick()
* parv[1] = nickname
*/
static void
mr_nick(struct MsgBuf *msgbuf_p, client::client &client, client::client &source, int parc, const char *parv[])
{
client::client *target_p;
char nick[NICKLEN];
if (strlen(client.id) == 3)
{
exit_client(&client, &client, &client, "Mixing client and server protocol");
return;
}
if(parc < 2 || EmptyString(parv[1]))
{
sendto_one(&source, form_str(ERR_NONICKNAMEGIVEN),
me.name, EmptyString(source.name) ? "*" : source.name);
return;
}
/* copy the nick and terminate it */
rb_strlcpy(nick, parv[1], ConfigFileEntry.nicklen);
/* check the nickname is ok */
if(!client::clean_nick(nick, 1))
{
sendto_one(&source, form_str(ERR_ERRONEUSNICKNAME),
me.name, EmptyString(source.name) ? "*" : source.name, parv[1]);
return;
}
/* check if the nick is resv'd */
if(find_nick_resv(nick))
{
sendto_one(&source, form_str(ERR_ERRONEUSNICKNAME),
me.name, EmptyString(source.name) ? "*" : source.name, nick);
return;
}
if(rb_dictionary_find(nd_dict, nick))
{
sendto_one(&source, form_str(ERR_UNAVAILRESOURCE),
me.name, EmptyString(source.name) ? "*" : source.name, nick);
return;
}
if((target_p = find_named_client(nick)) == NULL)
set_initial_nick(client, source, nick);
else if(&source == target_p)
rb_strlcpy(source.name, nick, sizeof(source.name));
else
sendto_one(&source, form_str(ERR_NICKNAMEINUSE), me.name, "*", nick);
}
/* m_nick()
* parv[1] = nickname
*/
static void
m_nick(struct MsgBuf *msgbuf_p, client::client &client, client::client &source, int parc, const char *parv[])
{
client::client *target_p;
char nick[NICKLEN];
if(parc < 2 || EmptyString(parv[1]))
{
sendto_one(&source, form_str(ERR_NONICKNAMEGIVEN), me.name, source.name);
return;
}
/* mark end of grace period, to prevent nickflooding */
if(!is_flood_done(source))
flood_endgrace(&source);
/* terminate nick to NICKLEN, we dont want client::clean_nick() to error! */
rb_strlcpy(nick, parv[1], ConfigFileEntry.nicklen);
/* check the nickname is ok */
if(!client::clean_nick(nick, 1))
{
sendto_one(&source, form_str(ERR_ERRONEUSNICKNAME), me.name, source.name, nick);
return;
}
if(!is_exempt_resv(source) && find_nick_resv(nick))
{
sendto_one(&source, form_str(ERR_ERRONEUSNICKNAME), me.name, source.name, nick);
return;
}
if(rb_dictionary_find(nd_dict, nick))
{
sendto_one(&source, form_str(ERR_UNAVAILRESOURCE),
me.name, EmptyString(source.name) ? "*" : source.name, nick);
return;
}
if((target_p = find_named_client(nick)))
{
/* If(target_p == &source) the client is changing nicks between
* equivalent nicknames ie: [nick] -> {nick}
*/
if(target_p == &source)
{
/* check the nick isnt exactly the same */
if(strcmp(target_p->name, nick))
change_local_nick(client, source, nick, 1);
}
/* drop unregged client */
else if(is_unknown(*target_p))
{
exit_client(NULL, target_p, &me, "Overridden");
change_local_nick(client, source, nick, 1);
}
else
sendto_one(&source, form_str(ERR_NICKNAMEINUSE), me.name, source.name, nick);
return;
}
else
change_local_nick(client, source, nick, 1);
}
/* mc_nick()
*
* server -> server nick change
* parv[1] = nickname
* parv[2] = TS when nick change
*/
static void
mc_nick(struct MsgBuf *msgbuf_p, client::client &client, client::client &source, int parc, const char *parv[])
{
client::client *target_p;
time_t newts = 0;
/* if nicks erroneous, or too long, kill */
if(!client::clean_nick(parv[1], 0))
{
bad_nickname(client, parv[1]);
return;
}
newts = atol(parv[2]);
target_p = find_named_client(parv[1]);
/* if the nick doesnt exist, allow it and process like normal */
if(target_p == NULL)
{
change_remote_nick(client, source, newts, parv[1], 1);
}
else if(is_unknown(*target_p))
{
exit_client(NULL, target_p, &me, "Overridden");
change_remote_nick(client, source, newts, parv[1], 1);
}
else if(target_p == &source)
{
/* client changing case of nick */
if(strcmp(target_p->name, parv[1]))
change_remote_nick(client, source, newts, parv[1], 1);
}
/* we've got a collision! */
else
perform_nickchange_collides(source, client, target_p,
parc, parv, newts, parv[1]);
}
static void
ms_nick(struct MsgBuf *msgbuf_p, client::client &client, client::client &source, int parc, const char *parv[])
{
const char *nick, *server;
nick = parc > 1 ? parv[1] : "?";
server = parc > 7 ? parv[7] : "?";
sendto_wallops_flags(umode::WALLOP, &me,
"Link %s cancelled, TS5 nickname %s on %s introduced (old server?)",
client.name, nick, server);
sendto_server(NULL, NULL, CAP_TS6, NOCAPS,
":%s WALLOPS :Link %s cancelled, TS5 nickname %s on %s introduced (old server?)",
me.id, client.name, nick, server);
ilog(L_SERVER, "Link %s cancelled, TS5 nickname %s on %s introduced (old server?)",
client.name, nick, server);
exit_client(&client, &client, &me, "TS5 nickname introduced");
}
/* ms_uid()
* parv[1] - nickname
* parv[2] - hops
* parv[3] - TS
* parv[4] - umodes
* parv[5] - username
* parv[6] - hostname
* parv[7] - IP
* parv[8] - UID
* parv[9] - gecos
*/
static void
ms_uid(struct MsgBuf *msgbuf_p, client::client &client, client::client &source, int parc, const char *parv[])
{
client::client *target_p;
time_t newts = 0;
char squitreason[120];
newts = atol(parv[3]);
if(parc != 10)
{
sendto_realops_snomask(sno::GENERAL, L_ALL,
"Dropping server %s due to (invalid) command 'UID' "
"with %d arguments (expecting 10)", client.name, parc);
ilog(L_SERVER, "Excess parameters (%d) for command 'UID' from %s.",
parc, client.name);
snprintf(squitreason, sizeof squitreason,
"Excess parameters (%d) to %s command, expecting %d",
parc, "UID", 10);
exit_client(&client, &client, &client, squitreason);
return;
}
/* if nicks erroneous, or too long, kill */
if(!client::clean_nick(parv[1], 0))
{
bad_nickname(client, parv[1]);
return;
}
if(!clean_uid(parv[8], source.id))
{
snprintf(squitreason, sizeof squitreason,
"Invalid UID %s for nick %s on %s/%s",
parv[8], parv[1], source.name, source.id);
exit_client(&client, &client, &client, squitreason);
return;
}
if(!clean_username(parv[5]) || !clean_host(parv[6]))
{
ServerStats.is_kill++;
sendto_realops_snomask(sno::DEBUG, L_ALL,
"Bad user@host: %s@%s From: %s(via %s)",
parv[5], parv[6], source.name, client.name);
sendto_one(&client, ":%s KILL %s :%s (Bad user@host)", me.id, parv[8], me.name);
return;
}
/* check length of clients gecos */
if(strlen(parv[9]) > REALLEN)
{
char *s = LOCAL_COPY(parv[9]);
sendto_realops_snomask(sno::GENERAL, L_ALL, "Long realname from server %s for %s",
source.name, parv[1]);
s[REALLEN] = '\0';
parv[9] = s;
}
target_p = find_named_client(parv[1]);
if(target_p == NULL)
{
register_client(client, &source, parv[1], newts, parc, parv);
}
else if(is_unknown(*target_p))
{
exit_client(NULL, target_p, &me, "Overridden");
register_client(client, &source, parv[1], newts, parc, parv);
}
/* we've got a collision! */
else
perform_nick_collides(source, client, target_p, parc, parv,
newts, parv[1], parv[8]);
}
/* ms_euid()
* parv[1] - nickname
* parv[2] - hops
* parv[3] - TS
* parv[4] - umodes
* parv[5] - username
* parv[6] - hostname
* parv[7] - IP
* parv[8] - UID
* parv[9] - realhost
* parv[10] - account
* parv[11] - gecos
*/
static void
ms_euid(struct MsgBuf *msgbuf_p, client::client &client, client::client &source, int parc, const char *parv[])
{
client::client *target_p;
time_t newts = 0;
char squitreason[120];
newts = atol(parv[3]);
if(parc != 12)
{
sendto_realops_snomask(sno::GENERAL, L_ALL,
"Dropping server %s due to (invalid) command 'EUID' "
"with %d arguments (expecting 12)", client.name, parc);
ilog(L_SERVER, "Excess parameters (%d) for command 'EUID' from %s.",
parc, client.name);
snprintf(squitreason, sizeof squitreason,
"Excess parameters (%d) to %s command, expecting %d",
parc, "EUID", 12);
exit_client(&client, &client, &client, squitreason);
return;
}
/* if nicks erroneous, or too long, kill */
if(!client::clean_nick(parv[1], 0))
{
bad_nickname(client, parv[1]);
return;
}
if(!clean_uid(parv[8], source.id))
{
snprintf(squitreason, sizeof squitreason,
"Invalid UID %s for nick %s on %s/%s",
parv[8], parv[1], source.name, source.id);
exit_client(&client, &client, &client, squitreason);
return;
}
if(!clean_username(parv[5]) || !clean_host(parv[6]))
{
ServerStats.is_kill++;
sendto_realops_snomask(sno::DEBUG, L_ALL,
"Bad user@host: %s@%s From: %s(via %s)",
parv[5], parv[6], source.name, client.name);
sendto_one(&client, ":%s KILL %s :%s (Bad user@host)", me.id, parv[8], me.name);
return;
}
if(strcmp(parv[9], "*") && !clean_host(parv[9]))
{
ServerStats.is_kill++;
sendto_realops_snomask(sno::DEBUG, L_ALL,
"Bad realhost: %s From: %s(via %s)",
parv[9], source.name, client.name);
sendto_one(&client, ":%s KILL %s :%s (Bad user@host)", me.id, parv[8], me.name);
return;
}
/* check length of clients gecos */
if(strlen(parv[11]) > REALLEN)
{
char *s = LOCAL_COPY(parv[11]);
sendto_realops_snomask(sno::GENERAL, L_ALL, "Long realname from server %s for %s",
source.name, parv[1]);
s[REALLEN] = '\0';
parv[11] = s;
}
target_p = find_named_client(parv[1]);
if(target_p == NULL)
{
register_client(client, &source, parv[1], newts, parc, parv);
}
else if(is_unknown(*target_p))
{
exit_client(NULL, target_p, &me, "Overridden");
register_client(client, &source, parv[1], newts, parc, parv);
}
/* we've got a collision! */
else
perform_nick_collides(source, client, target_p, parc, parv,
newts, parv[1], parv[8]);
}
/* ms_save()
* parv[1] - UID
* parv[2] - TS
*/
static void
ms_save(struct MsgBuf *msgbuf_p, client::client &client, client::client &source, int parc, const char *parv[])
{
client::client *target_p;
target_p = find_id(parv[1]);
if (target_p == NULL)
return;
if (!is_person(*target_p))
sendto_realops_snomask(sno::GENERAL, L_ALL,
"Ignored SAVE message for non-person %s from %s",
target_p->name, source.name);
else if (rfc1459::is_digit(target_p->name[0]))
sendto_realops_snomask(sno::DEBUG, L_ALL,
"Ignored noop SAVE message for %s from %s",
target_p->name, source.name);
else if (target_p->tsinfo == atol(parv[2]))
save_user(client, source, target_p);
else
sendto_realops_snomask(sno::SKILL, L_ALL,
"Ignored SAVE message for %s from %s",
target_p->name, source.name);
}
/* clean_username()
*
* input - username to check
* output - false if erroneous, else true
* side effects -
*/
static bool
clean_username(const char *username)
{
int len = 0;
for(; *username; username++)
{
len++;
if(!rfc1459::is_user(*username))
return false;
}
if(len > USERLEN)
return false;
return true;
}
/* clean_host()
*
* input - host to check
* output - false if erroneous, else true
* side effects -
*/
static bool
clean_host(const char *host)
{
int len = 0;
for(; *host; host++)
{
len++;
if(!rfc1459::is_host(*host))
return false;
}
if(len > HOSTLEN)
return false;
return true;
}
static bool
clean_uid(const char *uid, const char *sid)
{
int len = 1;
if(strncmp(uid, sid, strlen(sid)))
return false;
if(!rfc1459::is_digit(*uid++))
return false;
for(; *uid; uid++)
{
len++;
if(!rfc1459::is_id(*uid))
return false;
}
if(len != client::IDLEN - 1)
return false;
return true;
}
static void
set_initial_nick(client::client &client, client::client &source, char *nick)
{
char note[NICKLEN + 10];
/* This had to be copied here to avoid problems.. */
source.tsinfo = rb_current_time();
if(source.name[0])
del_from_client_hash(source.name, &source);
rb_strlcpy(source.name, nick, sizeof(source.name));
add_to_client_hash(nick, &source);
snprintf(note, sizeof(note), "Nick: %s", nick);
rb_note(client.localClient->F, note);
if(source.flags & client::flags::SENTUSER)
{
/* got user, heres nick. */
register_local_user(&client, &source);
}
}
static void
change_local_nick(client::client &client, client::client &source,
char *nick, int dosend)
{
client::client *target_p;
rb_dlink_node *ptr, *next_ptr;
chan::chan *chptr;
char note[NICKLEN + 10];
int samenick;
if (dosend)
{
chptr = chan::find_bannickchange_channel(&source);
if (chptr != NULL)
{
sendto_one_numeric(&source, ERR_BANNICKCHANGE,
form_str(ERR_BANNICKCHANGE),
nick,
chptr->name.c_str());
return;
}
if((source.localClient->last_nick_change + ConfigFileEntry.max_nick_time) < rb_current_time())
source.localClient->number_of_nick_changes = 0;
source.localClient->last_nick_change = rb_current_time();
source.localClient->number_of_nick_changes++;
if(ConfigFileEntry.anti_nick_flood && !is(source, umode::OPER) &&
source.localClient->number_of_nick_changes > ConfigFileEntry.max_nick_changes)
{
sendto_one(&source, form_str(ERR_NICKTOOFAST),
me.name, source.name, source.name,
nick, ConfigFileEntry.max_nick_time);
return;
}
}
samenick = irccmp(source.name, nick) ? 0 : 1;
/* dont reset TS if theyre just changing case of nick */
if(!samenick)
{
/* force the TS to increase -- jilles */
if (source.tsinfo >= rb_current_time())
source.tsinfo++;
else
source.tsinfo = rb_current_time();
monitor_signoff(&source);
/* we only do bancache for local users -- jilles */
if(source.user)
chan::invalidate_bancache_user(&source);
}
sendto_realops_snomask(sno::NCHANGE, L_ALL,
"Nick change: From %s to %s [%s@%s]",
source.name, nick, source.username, source.host);
/* send the nick change to the users channels */
sendto_common_channels_local(&source, NOCAPS, NOCAPS, ":%s!%s@%s NICK :%s",
source.name, source.username, source.host, nick);
/* send the nick change to servers.. */
if(source.user)
{
whowas::add(source);
if (dosend)
{
sendto_server(&client, NULL, CAP_TS6, NOCAPS, ":%s NICK %s :%ld",
use_id(&source), nick, (long) source.tsinfo);
}
}
/* Finally, add to hash */
del_from_client_hash(source.name, &source);
rb_strlcpy(source.name, nick, sizeof(source.name));
add_to_client_hash(nick, &source);
if(!samenick)
monitor_signon(&source);
/* Make sure everyone that has this client on its accept list
* loses that reference.
*/
/* we used to call del_all_accepts() here, but theres no real reason
* to clear a clients own list of accepted clients. So just remove
* them from everyone elses list --anfl
*/
RB_DLINK_FOREACH_SAFE(ptr, next_ptr, source.on_allow_list.head)
{
target_p = (client::client *)ptr->data;
rb_dlinkFindDestroy(&source, &target_p->localClient->allow_list);
rb_dlinkDestroy(ptr, &source.on_allow_list);
}
snprintf(note, sizeof(note), "Nick: %s", nick);
rb_note(client.localClient->F, note);
return;
}
/*
* change_remote_nick()
*/
static void
change_remote_nick(client::client &client, client::client &source,
time_t newts, const char *nick, int dosend)
{
struct nd_entry *nd;
int samenick = irccmp(source.name, nick) ? 0 : 1;
/* client changing their nick - dont reset ts if its same */
if(!samenick)
{
source.tsinfo = newts ? newts : rb_current_time();
monitor_signoff(&source);
}
sendto_common_channels_local(&source, NOCAPS, NOCAPS, ":%s!%s@%s NICK :%s",
source.name, source.username, source.host, nick);
if(source.user)
{
whowas::add(source);
if (dosend)
{
sendto_server(&client, NULL, CAP_TS6, NOCAPS, ":%s NICK %s :%ld",
use_id(&source), nick, (long) source.tsinfo);
}
}
del_from_client_hash(source.name, &source);
/* invalidate nick delay when a remote client uses the nick.. */
if((nd = (nd_entry *)rb_dictionary_retrieve(nd_dict, nick)))
free_nd_entry(nd);
rb_strlcpy(source.name, nick, sizeof(source.name));
add_to_client_hash(nick, &source);
if(!samenick)
monitor_signon(&source);
/* remove all accepts pointing to the client */
del_all_accepts(&source);
}
static void
perform_nick_collides(client::client &source, client::client &client,
client::client *target_p, int parc, const char *parv[],
time_t newts, const char *nick, const char *uid)
{
int sameuser;
int use_save;
const char *action;
use_save = ConfigFileEntry.collision_fnc && can_save(target_p) &&
uid != NULL && can_save(&source);
action = use_save ? "saved" : "killed";
/* if we dont have a ts, or their TS's are the same, kill both */
if(!newts || !target_p->tsinfo || (newts == target_p->tsinfo))
{
sendto_realops_snomask(sno::SKILL, L_ALL,
"Nick collision on %s(%s <- %s)(both %s)",
target_p->name, target_p->from->name, client.name, action);
if (use_save)
{
save_user(me, me, target_p);
ServerStats.is_save++;
sendto_one(&client, ":%s SAVE %s %ld", me.id,
uid, (long)newts);
register_client(client, &source,
uid, SAVE_NICKTS, parc, parv);
}
else
{
sendto_one_numeric(target_p, ERR_NICKCOLLISION,
form_str(ERR_NICKCOLLISION), target_p->name);
/* if the new client being introduced has a UID, we need to
* issue a KILL for it..
*/
if(uid)
sendto_one(&client, ":%s KILL %s :%s (Nick collision (new))",
me.id, uid, me.name);
/* we then need to KILL the old client everywhere */
kill_client_serv_butone(NULL, target_p, "%s (Nick collision (new))", me.name);
ServerStats.is_kill++;
target_p->flags |= client::flags::KILLED;
exit_client(&client, target_p, &me, "Nick collision (new)");
}
return;
}
/* the timestamps are different */
else
{
sameuser = (target_p->user) && !irccmp(target_p->username, parv[5])
&& !irccmp(target_p->host, parv[6]);
if((sameuser && newts < target_p->tsinfo) ||
(!sameuser && newts > target_p->tsinfo))
{
/* if we have a UID, then we need to issue a KILL,
* otherwise we do nothing and hope that the other
* client will collide it..
*/
if (use_save)
{
sendto_one(&client, ":%s SAVE %s %ld", me.id,
uid, (long)newts);
register_client(client, &source,
uid, SAVE_NICKTS, parc, parv);
}
else if(uid)
sendto_one(&client,
":%s KILL %s :%s (Nick collision (new))",
me.id, uid, me.name);
return;
}
else
{
if(sameuser)
sendto_realops_snomask(sno::SKILL, L_ALL,
"Nick collision on %s(%s <- %s)(older %s)",
target_p->name, target_p->from->name,
client.name, action);
else
sendto_realops_snomask(sno::SKILL, L_ALL,
"Nick collision on %s(%s <- %s)(newer %s)",
target_p->name, target_p->from->name,
client.name, action);
if (use_save)
{
ServerStats.is_save++;
save_user(me, me, target_p);
}
else
{
ServerStats.is_kill++;
sendto_one_numeric(target_p, ERR_NICKCOLLISION,
form_str(ERR_NICKCOLLISION), target_p->name);
/* now we just need to kill the existing client */
kill_client_serv_butone(&client, target_p,
"%s (Nick collision (new))", me.name);
target_p->flags |= client::flags::KILLED;
(void) exit_client(&client, target_p, &me, "Nick collision");
}
register_client(client, &source,
nick, newts, parc, parv);
}
}
}
static void
perform_nickchange_collides(client::client &source, client::client &client,
client::client *target_p, int parc,
const char *parv[], time_t newts, const char *nick)
{
int sameuser;
int use_save;
const char *action;
use_save = ConfigFileEntry.collision_fnc && can_save(target_p) &&
can_save(&source);
action = use_save ? "saved" : "killed";
/* its a client changing nick and causing a collide */
if(!newts || !target_p->tsinfo || (newts == target_p->tsinfo) || !source.user)
{
sendto_realops_snomask(sno::SKILL, L_ALL,
"Nick change collision from %s to %s(%s <- %s)(both %s)",
source.name, target_p->name, target_p->from->name,
client.name, action);
if (use_save)
{
ServerStats.is_save += 2;
save_user(me, me, target_p);
sendto_one(&client, ":%s SAVE %s %ld", me.id,
source.id, (long)newts);
/* don't send a redundant nick change */
if (!rfc1459::is_digit(source.name[0]))
change_remote_nick(client, source, SAVE_NICKTS, source.id, 1);
}
else
{
ServerStats.is_kill++;
sendto_one_numeric(target_p, ERR_NICKCOLLISION,
form_str(ERR_NICKCOLLISION), target_p->name);
kill_client_serv_butone(NULL, &source, "%s (Nick change collision)", me.name);
ServerStats.is_kill++;
kill_client_serv_butone(NULL, target_p, "%s (Nick change collision)", me.name);
target_p->flags |= client::flags::KILLED;
exit_client(NULL, target_p, &me, "Nick collision(new)");
source.flags |= client::flags::KILLED;
exit_client(&client, &source, &me, "Nick collision(old)");
}
return;
}
else
{
sameuser = !irccmp(target_p->username, source.username) &&
!irccmp(target_p->host, source.host);
if((sameuser && newts < target_p->tsinfo) ||
(!sameuser && newts > target_p->tsinfo))
{
if(sameuser)
sendto_realops_snomask(sno::SKILL, L_ALL,
"Nick change collision from %s to %s(%s <- %s)(older %s)",
source.name, target_p->name,
target_p->from->name, client.name, action);
else
sendto_realops_snomask(sno::SKILL, L_ALL,
"Nick change collision from %s to %s(%s <- %s)(newer %s)",
source.name, target_p->name,
target_p->from->name, client.name, action);
if (use_save)
{
ServerStats.is_save++;
/* can't broadcast a SAVE because the
* nickchange has happened at &client
* but not in other directions -- jilles */
sendto_one(&client, ":%s SAVE %s %ld", me.id,
source.id, (long)newts);
/* send a :<id> NICK <id> <ts> (!) */
if (!rfc1459::is_digit(source.name[0]))
change_remote_nick(client, source, SAVE_NICKTS, source.id, 1);
}
else
{
ServerStats.is_kill++;
sendto_one_numeric(&source, ERR_NICKCOLLISION,
form_str(ERR_NICKCOLLISION), source.name);
/* kill the client issuing the nickchange */
kill_client_serv_butone(&client, &source,
"%s (Nick change collision)", me.name);
source.flags |= client::flags::KILLED;
if(sameuser)
exit_client(&client, &source, &me, "Nick collision(old)");
else
exit_client(&client, &source, &me, "Nick collision(new)");
}
return;
}
else
{
if(sameuser)
sendto_realops_snomask(sno::SKILL, L_ALL,
"Nick collision on %s(%s <- %s)(older %s)",
target_p->name, target_p->from->name,
client.name, action);
else
sendto_realops_snomask(sno::SKILL, L_ALL,
"Nick collision on %s(%s <- %s)(newer %s)",
target_p->name, target_p->from->name,
client.name, action);
if (use_save)
{
ServerStats.is_save++;
save_user(me, me, target_p);
}
else
{
sendto_one_numeric(target_p, ERR_NICKCOLLISION,
form_str(ERR_NICKCOLLISION), target_p->name);
/* kill the client who existed before hand */
kill_client_serv_butone(&client, target_p, "%s (Nick collision)", me.name);
ServerStats.is_kill++;
target_p->flags |= client::flags::KILLED;
(void) exit_client(&client, target_p, &me, "Nick collision");
}
}
}
change_remote_nick(client, source, newts, nick, 1);
}
static void
register_client(client::client &client, client::client *server,
const char *nick, time_t newts, int parc, const char *parv[])
{
client::client *source;
struct nd_entry *nd;
const char *m;
int flag;
source = make_client(&client);
make_user(*source);
rb_dlinkAddTail(source, &source->node, &global_client_list);
source->hopcount = atoi(parv[2]);
source->tsinfo = newts;
rb_strlcpy(source->name, nick, sizeof(source->name));
rb_strlcpy(source->username, parv[5], sizeof(source->username));
rb_strlcpy(source->host, parv[6], sizeof(source->host));
rb_strlcpy(source->orighost, source->host, sizeof(source->orighost));
if(parc == 12)
{
rb_strlcpy(source->info, parv[11], sizeof(source->info));
rb_strlcpy(source->sockhost, parv[7], sizeof(source->sockhost));
rb_strlcpy(source->id, parv[8], sizeof(source->id));
add_to_id_hash(source->id, source);
if (strcmp(parv[9], "*"))
{
rb_strlcpy(source->orighost, parv[9], sizeof(source->orighost));
if (irccmp(source->host, source->orighost))
set_dyn_spoof(*source);
}
if (strcmp(parv[10], "*"))
suser(user(*source)) = parv[10];
}
else if(parc == 10)
{
rb_strlcpy(source->info, parv[9], sizeof(source->info));
rb_strlcpy(source->sockhost, parv[7], sizeof(source->sockhost));
rb_strlcpy(source->id, parv[8], sizeof(source->id));
add_to_id_hash(source->id, source);
}
else
{
s_assert(0);
}
/* remove any nd entries for this nick */
if((nd = (nd_entry *)rb_dictionary_retrieve(nd_dict, nick)))
free_nd_entry(nd);
add_to_client_hash(nick, source);
add_to_hostname_hash(source->orighost, source);
monitor_signon(source);
m = &parv[4][1];
while(*m)
{
flag = umode::table[(unsigned char) *m];
if(flag & umode::SERVICE)
{
int hit = 0;
rb_dlink_node *ptr;
RB_DLINK_FOREACH(ptr, service_list.head)
{
if(!irccmp((const char *) ptr->data, server->name))
{
hit++;
break;
}
}
if(!hit)
{
m++;
continue;
}
}
/* increment +i count if theyre invis */
if(!(source->mode & umode::INVISIBLE) && (flag & umode::INVISIBLE))
Count.invisi++;
/* increment opered count if theyre opered */
if(!(source->mode & umode::OPER) && (flag & umode::OPER))
Count.oper++;
source->mode |= flag;
m++;
}
if(is(*source, umode::OPER) && !is(*source, umode::SERVICE))
rb_dlinkAddAlloc(source, &oper_list);
set_remote_client(*source);
if(++Count.total > Count.max_tot)
Count.max_tot = Count.total;
source->servptr = server;
source->lnode = users(serv(*source)).emplace(end(users(serv(*source))), source);
call_hook(h_new_remote_user, source);
introduce_client(&client, source, nick, parc == 12);
}
/* Check if we can do SAVE. target_p can be a client to save or a
* server introducing a client -- jilles */
static bool
can_save(client::client *target_p)
{
client::client *serv_p;
if (my(*target_p))
return true;
if (!has_id(target_p))
return false;
serv_p = is_server(*target_p) ? target_p : target_p->servptr;
while (serv_p != NULL && serv_p != &me)
{
if (~caps(serv(*serv_p)) & CAP_SAVE)
return false;
serv_p = serv_p->servptr;
}
return serv_p == &me;
}
static void
save_user(client::client &client, client::client &source,
client::client *target_p)
{
if (!my_connect(*target_p) && (!has_id(target_p) || !IsCapable(target_p->from, CAP_SAVE)))
{
/* This shouldn't happen */
/* Note we only need SAVE support in this direction */
sendto_realops_snomask(sno::GENERAL, L_ALL,
"Killed %s!%s@%s for nick collision detected by %s (%s does not support SAVE)",
target_p->name, target_p->username, target_p->host, source.name, target_p->from->name);
kill_client_serv_butone(NULL, target_p, "%s (Nick collision (no SAVE support))", me.name);
ServerStats.is_kill++;
target_p->flags |= client::flags::KILLED;
(void) exit_client(NULL, target_p, &me, "Nick collision (no SAVE support)");
return;
}
sendto_server(&client, NULL, CAP_SAVE|CAP_TS6, NOCAPS, ":%s SAVE %s %ld",
source.id, target_p->id, (long)target_p->tsinfo);
sendto_server(&client, NULL, CAP_TS6, CAP_SAVE, ":%s NICK %s :%ld",
target_p->id, target_p->id, (long)SAVE_NICKTS);
if (!is_me(client))
sendto_realops_snomask(sno::SKILL, L_ALL,
"Received SAVE message for %s from %s",
target_p->name, source.name);
if (my(*target_p))
{
sendto_one_numeric(target_p, RPL_SAVENICK,
form_str(RPL_SAVENICK), target_p->id);
change_local_nick(*target_p, *target_p, target_p->id, 0);
target_p->tsinfo = SAVE_NICKTS;
}
else
change_remote_nick(*target_p, *target_p, SAVE_NICKTS, target_p->id, 0);
}
static void bad_nickname(client::client &client, const char *nick)
{
char squitreason[100];
sendto_wallops_flags(umode::WALLOP, &me,
"Squitting %s because of bad nickname %s (NICKLEN mismatch?)",
client.name, nick);
sendto_server(NULL, NULL, CAP_TS6, NOCAPS,
":%s WALLOPS :Squitting %s because of bad nickname %s (NICKLEN mismatch?)",
me.id, client.name, nick);
ilog(L_SERVER, "Link %s cancelled, bad nickname %s sent (NICKLEN mismatch?)",
client.name, nick);
snprintf(squitreason, sizeof squitreason,
"Bad nickname introduced [%s]", nick);
exit_client(&client, &client, &me, squitreason);
}
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