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ircd-ratbox/ircd-ratbox-3.0.10/modules/core/m_nick.c
agatha 62da4c26fa Initial commit
2023-08-20 13:26:10 -04:00

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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) 2002-2012 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*
* $Id: m_nick.c 29271 2015-12-29 02:38:25Z androsyn $
*/
#include "stdinc.h"
#include "struct.h"
#include "client.h"
#include "channel.h"
#include "hash.h"
#include "match.h"
#include "ircd.h"
#include "numeric.h"
#include "s_conf.h"
#include "s_stats.h"
#include "s_user.h"
#include "hash.h"
#include "whowas.h"
#include "s_serv.h"
#include "s_log.h"
#include "send.h"
#include "parse.h"
#include "modules.h"
#include "scache.h"
#include "s_newconf.h"
#include "monitor.h"
#include "reject.h"
/* 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 int mr_nick(struct Client *, struct Client *, int, const char **);
static int m_nick(struct Client *, struct Client *, int, const char **);
static int mc_nick(struct Client *, struct Client *, int, const char **);
static int ms_nick(struct Client *, struct Client *, int, const char **);
static int ms_uid(struct Client *, struct Client *, int, const char **);
static int ms_save(struct Client *, struct Client *, int, const char **);
static int can_save(struct Client *);
static void save_user(struct Client *, struct Client *, struct Client *);
struct Message nick_msgtab = {
"NICK", 0, 0, 0, MFLG_SLOW,
{{mr_nick, 0}, {m_nick, 0}, {mc_nick, 3}, {ms_nick, 8}, mg_ignore, {m_nick, 0}}
};
struct Message uid_msgtab = {
"UID", 0, 0, 0, MFLG_SLOW,
{mg_ignore, mg_ignore, mg_ignore, {ms_uid, 9}, mg_ignore, mg_ignore}
};
struct Message save_msgtab = {
"SAVE", 0, 0, 0, MFLG_SLOW,
{mg_ignore, mg_ignore, mg_ignore, {ms_save, 3}, mg_ignore, mg_ignore}
};
mapi_clist_av1 nick_clist[] = { &nick_msgtab, &uid_msgtab, &save_msgtab, NULL };
DECLARE_MODULE_AV1(nick, NULL, NULL, nick_clist, NULL, NULL, "$Revision: 29271 $");
static int change_remote_nick(struct Client *, struct Client *, time_t, const char *, int);
static int clean_nick(const char *, int loc_client);
static int clean_username(const char *);
static int clean_host(const char *);
static int clean_uid(const char *uid);
static void set_initial_nick(struct Client *client_p, struct Client *source_p, char *nick);
static void change_local_nick(struct Client *client_p, struct Client *source_p, char *nick, int);
static int register_client(struct Client *client_p, struct Client *server,
const char *nick, time_t newts, int parc, const char *parv[]);
static int perform_nick_collides(struct Client *, struct Client *,
struct Client *, int, const char **,
time_t, const char *, const char *);
static int perform_nickchange_collides(struct Client *, struct Client *,
struct Client *, time_t, const char *);
/* mr_nick()
* parv[0] = sender prefix
* parv[1] = nickname
*/
static int
mr_nick(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
struct Client *target_p;
char nick[NICKLEN];
char *s;
if(parc < 2 || EmptyString(parv[1]) || (parv[1][0] == '~'))
{
sendto_one(source_p, form_str(ERR_NONICKNAMEGIVEN),
me.name, EmptyString(source_p->name) ? "*" : source_p->name);
return 0;
}
/* due to the scandinavian origins, (~ being uppercase of ^) and ~
* being disallowed as a nick char, we need to chop the first ~
* instead of just erroring.
*/
if((s = strchr(parv[1], '~')))
*s = '\0';
/* copy the nick and terminate it */
rb_strlcpy(nick, parv[1], sizeof(nick));
/* check the nickname is ok */
if(!clean_nick(nick, 1))
{
sendto_one(source_p, form_str(ERR_ERRONEUSNICKNAME),
me.name, EmptyString(parv[0]) ? "*" : parv[0], parv[1]);
return 0;
}
/* check if the nick is resv'd */
if(!IsExemptResv(source_p) && find_nick_resv(nick))
{
sendto_one(source_p, form_str(ERR_ERRONEUSNICKNAME),
me.name, EmptyString(source_p->name) ? "*" : source_p->name, nick);
return 0;
}
if(hash_find_nd(nick))
{
sendto_one(source_p, form_str(ERR_UNAVAILRESOURCE),
me.name, EmptyString(source_p->name) ? "*" : source_p->name, nick);
return 0;
}
if((target_p = find_client(nick)) == NULL)
set_initial_nick(client_p, source_p, nick);
else if(source_p == target_p)
strcpy(source_p->user->name, nick);
else
sendto_one(source_p, form_str(ERR_NICKNAMEINUSE), me.name, "*", nick);
return 0;
}
/* m_nick()
* parv[0] = sender prefix
* parv[1] = nickname
*/
static int
m_nick(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
struct Client *target_p;
char nick[NICKLEN];
char *s;
if(parc < 2 || EmptyString(parv[1]) || (parv[1][0] == '~'))
{
sendto_one(source_p, form_str(ERR_NONICKNAMEGIVEN), me.name, source_p->name);
return 0;
}
/* due to the scandinavian origins, (~ being uppercase of ^) and ~
* being disallowed as a nick char, we need to chop the first ~
* instead of just erroring.
*/
if((s = strchr(parv[1], '~')))
*s = '\0';
/* mark end of grace period, to prevent nickflooding */
if(!IsFloodDone(source_p))
flood_endgrace(source_p);
/* terminate nick to NICKLEN, we dont want clean_nick() to error! */
rb_strlcpy(nick, parv[1], sizeof(nick));
/* check the nickname is ok */
if(!clean_nick(nick, 1))
{
sendto_one(source_p, form_str(ERR_ERRONEUSNICKNAME), me.name, parv[0], nick);
return 0;
}
if(find_nick_resv(nick))
{
sendto_one(source_p, form_str(ERR_ERRONEUSNICKNAME), me.name, source_p->name, nick);
return 0;
}
if(hash_find_nd(nick))
{
sendto_one(source_p, form_str(ERR_UNAVAILRESOURCE),
me.name, EmptyString(source_p->name) ? "*" : source_p->name, nick);
return 0;
}
if((target_p = find_client(nick)))
{
/* If(target_p == source_p) the client is changing nicks between
* equivalent nicknames ie: [nick] -> {nick}
*/
if(target_p == source_p)
{
/* check the nick isnt exactly the same */
if(strcmp(target_p->name, nick))
change_local_nick(client_p, source_p, nick, 1);
}
/* drop unregged client */
else if(IsUnknown(target_p))
{
exit_client(NULL, target_p, &me, "Overridden");
change_local_nick(client_p, source_p, nick, 1);
}
else
sendto_one(source_p, form_str(ERR_NICKNAMEINUSE), me.name, parv[0], nick);
return 0;
}
else
change_local_nick(client_p, source_p, nick, 1);
return 0;
}
/* ms_nick()
*
* server -> server nick change
* parv[0] = sender prefix
* parv[1] = nickname
* parv[2] = TS when nick change
*
* server introducing new nick
* parv[0] = sender prefix
* parv[1] = nickname
* parv[2] = hop count
* parv[3] = TS
* parv[4] = umode
* parv[5] = username
* parv[6] = hostname
* parv[7] = server
* parv[8] = ircname
*/
static int
mc_nick(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
struct Client *target_p;
time_t newts = 0;
/* if nicks erroneous, or too long, kill */
if(!clean_nick(parv[1], 0))
{
ServerStats.is_kill++;
sendto_realops_flags(UMODE_DEBUG, L_ALL,
"Bad Nick: %s From: %s(via %s)",
parv[1], source_p->servptr->name, client_p->name);
sendto_one(client_p, ":%s KILL %s :%s (Bad Nickname)", me.name, parv[1], me.name);
/* bad nick change, issue kill for the old nick to the rest
* of the network.
*/
kill_client_serv_butone(client_p, source_p, "%s (Bad Nickname)", me.name);
source_p->flags |= FLAGS_KILLED;
exit_client(client_p, source_p, &me, "Bad Nickname");
return 0;
}
newts = atol(parv[2]);
target_p = find_client(parv[1]);
/* if the nick doesnt exist, allow it and process like normal */
if(target_p == NULL)
{
change_remote_nick(client_p, source_p, newts, parv[1], 1);
}
else if(IsUnknown(target_p))
{
exit_client(NULL, target_p, &me, "Overridden");
change_remote_nick(client_p, source_p, newts, parv[1], 1);
}
else if(target_p == source_p)
{
/* client changing case of nick */
if(strcmp(target_p->name, parv[1]))
change_remote_nick(client_p, source_p, newts, parv[1], 1);
}
/* we've got a collision! */
else
perform_nickchange_collides(source_p, client_p, target_p, newts, parv[1]);
return 0;
}
static int
ms_nick(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
struct Client *target_p;
time_t newts = 0;
if(parc != 9)
{
sendto_realops_flags(UMODE_ALL, L_ALL,
"Dropping server %s due to (invalid) command 'NICK' "
"with %d arguments (expecting 9)", client_p->name, parc);
ilog(L_SERVER, "Excess parameters (%d) for command 'NICK' from %s.",
parc, client_p->name);
exit_client(client_p, client_p, client_p, "Excess parameters to NICK command");
return 0;
}
/* if nicks empty, erroneous, or too long, kill */
if(!clean_nick(parv[1], 0))
{
ServerStats.is_kill++;
sendto_realops_flags(UMODE_DEBUG, L_ALL,
"Bad Nick: %s From: %s(via %s)",
parv[1], parv[7], client_p->name);
sendto_one(client_p, ":%s KILL %s :%s (Bad Nickname)", me.name, parv[1], me.name);
return 0;
}
/* invalid username or host? */
if(!clean_username(parv[5]) || !clean_host(parv[6]))
{
ServerStats.is_kill++;
sendto_realops_flags(UMODE_DEBUG, L_ALL,
"Bad user@host: %s@%s From: %s(via %s)",
parv[5], parv[6], parv[7], client_p->name);
sendto_one(client_p, ":%s KILL %s :%s (Bad user@host)", me.name, parv[1], me.name);
return 0;
}
/* check the length of the clients gecos */
if(strlen(parv[8]) > REALLEN)
{
parv[8] = LOCAL_COPY_N(parv[8], REALLEN);
/* why exactly do we care? --fl */
/* sendto_realops_flags(UMODE_ALL, L_ALL,
* "Long realname from server %s for %s", parv[7],
* parv[1]);
* i don't care, nobody else does. --androsyn
*/
}
newts = atol(parv[3]);
target_p = find_client(parv[1]);
/* if the nick doesnt exist, allow it and process like normal */
if(target_p == NULL)
{
register_client(client_p, NULL, parv[1], newts, parc, parv);
}
else if(IsUnknown(target_p))
{
exit_client(NULL, target_p, &me, "Overridden");
register_client(client_p, NULL, parv[1], newts, parc, parv);
}
else if(target_p == source_p)
{
/* client changing case of nick */
if(strcmp(target_p->name, parv[1]))
register_client(client_p, NULL, parv[1], newts, parc, parv);
}
/* we've got a collision! */
else
perform_nick_collides(source_p, client_p, target_p, parc, parv,
newts, parv[1], NULL);
return 0;
}
/* 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 int
ms_uid(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
struct Client *target_p;
time_t newts = 0;
newts = atol(parv[3]);
if(parc != 10)
{
sendto_realops_flags(UMODE_ALL, L_ALL,
"Dropping server %s due to (invalid) command 'UID' "
"with %d arguments (expecting 10)", client_p->name, parc);
ilog(L_SERVER, "Excess parameters (%d) for command 'UID' from %s.",
parc, client_p->name);
exit_client(client_p, client_p, client_p, "Excess parameters to UID command");
return 0;
}
/* if nicks erroneous, or too long, kill */
if(!clean_nick(parv[1], 0))
{
ServerStats.is_kill++;
sendto_realops_flags(UMODE_DEBUG, L_ALL,
"Bad Nick: %s From: %s(via %s)",
parv[1], source_p->name, client_p->name);
sendto_one(client_p, ":%s KILL %s :%s (Bad Nickname)", me.id, parv[8], me.name);
return 0;
}
if(!clean_username(parv[5]) || !clean_host(parv[6]))
{
ServerStats.is_kill++;
sendto_realops_flags(UMODE_DEBUG, L_ALL,
"Bad user@host: %s@%s From: %s(via %s)",
parv[5], parv[6], source_p->name, client_p->name);
sendto_one(client_p, ":%s KILL %s :%s (Bad user@host)", me.id, parv[8], me.name);
return 0;
}
if(!clean_uid(parv[8]))
{
ServerStats.is_kill++;
sendto_realops_flags(UMODE_DEBUG, L_ALL,
"Bad UID: %s From: %s(via %s)",
parv[8], source_p->name, client_p->name);
sendto_one(client_p, ":%s KILL %s :%s (Bad UID)", me.id, parv[8], me.name);
return 0;
}
/* check length of clients gecos */
if(strlen(parv[9]) > REALLEN)
{
parv[9] = LOCAL_COPY_N(parv[9], REALLEN);
}
target_p = find_client(parv[1]);
if(target_p == NULL)
{
register_client(client_p, source_p, parv[1], newts, parc, parv);
}
else if(IsUnknown(target_p))
{
exit_client(NULL, target_p, &me, "Overridden");
register_client(client_p, source_p, parv[1], newts, parc, parv);
}
/* we've got a collision! */
else
perform_nick_collides(source_p, client_p, target_p, parc, parv,
newts, parv[1], parv[8]);
return 0;
}
/* ms_save()
* parv[1] - UID
* parv[2] - TS
*/
static int
ms_save(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
struct Client *target_p;
target_p = find_id(parv[1]);
if(target_p == NULL)
return 0;
if(!IsClient(target_p))
sendto_realops_flags(UMODE_ALL, L_ALL,
"Ignored SAVE message for non-person %s from %s",
target_p->name, source_p->name);
else if(IsDigit(target_p->name[0]))
sendto_realops_flags(UMODE_DEBUG, L_ALL,
"Ignored noop SAVE message for %s from %s",
target_p->name, source_p->name);
else if(target_p->tsinfo == atol(parv[2]))
save_user(client_p, source_p, target_p);
else
sendto_realops_flags(UMODE_SKILL, L_ALL,
"Ignored SAVE message for %s from %s",
target_p->name, source_p->name);
return 0;
}
/* clean_nick()
*
* input - nickname to check
* output - 0 if erroneous, else 1
* side effects -
*/
static int
clean_nick(const char *nick, int loc_client)
{
int len = 0;
/* nicks cant start with a digit or -, and must have a length */
if(*nick == '-' || *nick == '\0')
return 0;
if(loc_client && IsDigit(*nick))
return 0;
for(; *nick; nick++)
{
len++;
if(!IsNickChar(*nick))
return 0;
}
/* nicklen is +1 */
if(len >= NICKLEN)
return 0;
return 1;
}
/* clean_username()
*
* input - username to check
* output - 0 if erroneous, else 0
* side effects -
*/
static int
clean_username(const char *username)
{
int len = 0;
for(; *username; username++)
{
len++;
if(!IsUserChar(*username))
return 0;
}
if(len > USERLEN)
return 0;
return 1;
}
/* clean_host()
*
* input - host to check
* output - 0 if erroneous, else 0
* side effects -
*/
static int
clean_host(const char *host)
{
int len = 0;
for(; *host; host++)
{
len++;
if(!IsHostChar(*host))
return 0;
}
if(len > HOSTLEN)
return 0;
return 1;
}
static int
clean_uid(const char *uid)
{
int len = 1;
if(!IsDigit(*uid++))
return 0;
for(; *uid; uid++)
{
len++;
if(!IsIdChar(*uid))
return 0;
}
if(len != IDLEN - 1)
return 0;
return 1;
}
static void
set_initial_nick(struct Client *client_p, struct Client *source_p, char *nick)
{
char buf[USERLEN + 1];
char note[NICKLEN + 10];
/* This had to be copied here to avoid problems.. */
source_p->tsinfo = rb_current_time();
if(!EmptyString(source_p->name))
del_from_hash(HASH_CLIENT, source_p->name, source_p);
make_user(source_p);
strcpy(source_p->user->name, nick);
source_p->name = source_p->user->name;
add_to_hash(HASH_CLIENT, nick, source_p);
rb_snprintf(note, sizeof(note), "Nick: %s", nick);
rb_note(client_p->localClient->F, note);
if(HasSentUser(source_p))
{
rb_strlcpy(buf, source_p->username, sizeof(buf));
/* got user, heres nick. */
register_local_user(client_p, source_p, buf);
}
}
static void
change_local_nick(struct Client *client_p, struct Client *source_p, char *nick, int dosend)
{
struct Client *target_p;
rb_dlink_node *ptr, *next_ptr;
char note[NICKLEN + 10];
int samenick;
if(dosend)
{
if((source_p->localClient->last_nick_change + ConfigFileEntry.max_nick_time) <
rb_current_time())
source_p->localClient->number_of_nick_changes = 0;
if(ConfigFileEntry.anti_nick_flood && !IsOper(source_p) &&
source_p->localClient->number_of_nick_changes > ConfigFileEntry.max_nick_changes)
{
sendto_one(source_p, form_str(ERR_NICKTOOFAST),
me.name, source_p->name, source_p->name,
nick, ConfigFileEntry.max_nick_time);
return;
}
source_p->localClient->last_nick_change = rb_current_time();
source_p->localClient->number_of_nick_changes++;
}
samenick = irccmp(source_p->name, nick) ? 0 : 1;
/* dont reset TS if theyre just changing case of nick */
if(!samenick)
{
/* force the TS to increase -- jilles */
if(source_p->tsinfo >= rb_current_time())
source_p->tsinfo++;
else
source_p->tsinfo = rb_current_time();
monitor_signoff(source_p);
/* we only do bancache for local users -- jilles */
if(source_p->user)
invalidate_bancache_user(source_p);
}
sendto_realops_flags(UMODE_NCHANGE, L_ALL,
"Nick change: From %s to %s [%s@%s]",
source_p->name, nick, source_p->username, source_p->host);
/* send the nick change to the users channels */
sendto_common_channels_local(source_p, ":%s!%s@%s NICK :%s",
source_p->name, source_p->username, source_p->host, nick);
/* send the nick change to servers.. */
if(source_p->user)
{
add_history(source_p, 1);
if(dosend)
{
sendto_server(client_p, NULL, CAP_TS6, NOCAPS, ":%s NICK %s :%" RBTT_FMT,
use_id(source_p), nick, source_p->tsinfo);
sendto_server(client_p, NULL, NOCAPS, CAP_TS6, ":%s NICK %s :%" RBTT_FMT,
source_p->name, nick, source_p->tsinfo);
}
}
/* Finally, add to hash */
del_from_hash(HASH_CLIENT, source_p->name, source_p);
strcpy(source_p->user->name, nick);
add_to_hash(HASH_CLIENT, nick, source_p);
if(!samenick)
monitor_signon(source_p);
/* 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_p->on_allow_list.head)
{
target_p = ptr->data;
rb_dlinkFindDestroy(source_p, &target_p->localClient->allow_list);
rb_dlinkDestroy(ptr, &source_p->on_allow_list);
}
rb_snprintf(note, sizeof(note), "Nick: %s", nick);
rb_note(client_p->localClient->F, note);
return;
}
/*
* change_remote_nick()
*/
static int
change_remote_nick(struct Client *client_p, struct Client *source_p,
time_t newts, const char *nick, int dosend)
{
struct nd_entry *nd;
int samenick = irccmp(source_p->name, nick) ? 0 : 1;
/* client changing their nick - dont reset ts if its same */
if(!samenick)
{
source_p->tsinfo = newts ? newts : rb_current_time();
monitor_signoff(source_p);
}
sendto_common_channels_local(source_p, ":%s!%s@%s NICK :%s",
source_p->name, source_p->username, source_p->host, nick);
if(source_p->user)
{
add_history(source_p, 1);
if(dosend)
{
sendto_server(client_p, NULL, CAP_TS6, NOCAPS, ":%s NICK %s :%" RBTT_FMT,
use_id(source_p), nick, source_p->tsinfo);
sendto_server(client_p, NULL, NOCAPS, CAP_TS6, ":%s NICK %s :%" RBTT_FMT,
source_p->name, nick, source_p->tsinfo);
}
}
del_from_hash(HASH_CLIENT, source_p->name, source_p);
/* invalidate nick delay when a remote client uses the nick.. */
if((nd = hash_find_nd(nick)))
free_nd_entry(nd);
strcpy(source_p->user->name, nick);
add_to_hash(HASH_CLIENT, nick, source_p);
if(!samenick)
monitor_signon(source_p);
/* remove all accepts pointing to the client */
del_all_accepts(source_p);
return 0;
}
static int
perform_nick_collides(struct Client *source_p, struct Client *client_p,
struct 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_p);
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_flags(UMODE_ALL, L_ALL,
"Nick collision on %s(%s <- %s)(both %s)",
target_p->name, target_p->from->name, client_p->name, action);
if(use_save)
{
save_user(&me, &me, target_p);
ServerStats.is_save++;
sendto_one(client_p, ":%s SAVE %s %" RBTT_FMT, me.id, uid, newts);
register_client(client_p, source_p, 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_p, ":%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 |= FLAGS_KILLED;
exit_client(client_p, target_p, &me, "Nick collision (new)");
}
return 0;
}
/* 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_p, ":%s SAVE %s %" RBTT_FMT, me.id, uid, newts);
register_client(client_p, source_p, uid, SAVE_NICKTS, parc, parv);
}
else if(uid)
sendto_one(client_p,
":%s KILL %s :%s (Nick collision (new))",
me.id, uid, me.name);
return 0;
}
else
{
if(sameuser)
sendto_realops_flags(UMODE_ALL, L_ALL,
"Nick collision on %s(%s <- %s)(older %s)",
target_p->name, target_p->from->name,
client_p->name, action);
else
sendto_realops_flags(UMODE_ALL, L_ALL,
"Nick collision on %s(%s <- %s)(newer %s)",
target_p->name, target_p->from->name,
client_p->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_p, target_p,
"%s (Nick collision (new))", me.name);
target_p->flags |= FLAGS_KILLED;
(void)exit_client(client_p, target_p, &me, "Nick collision");
}
register_client(client_p, parc == 10 ? source_p : NULL,
nick, newts, parc, parv);
return 0;
}
}
}
static int
perform_nickchange_collides(struct Client *source_p, struct Client *client_p,
struct Client *target_p, 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_p);
action = use_save ? "saved" : "killed";
/* its a client changing nick and causing a collide */
if(!newts || !target_p->tsinfo || (newts == target_p->tsinfo) || !source_p->user)
{
sendto_realops_flags(UMODE_ALL, L_ALL,
"Nick change collision from %s to %s(%s <- %s)(both %s)",
source_p->name, target_p->name, target_p->from->name,
client_p->name, action);
if(use_save)
{
ServerStats.is_save += 2;
save_user(&me, &me, target_p);
sendto_one(client_p, ":%s SAVE %s %" RBTT_FMT, me.id, source_p->id, newts);
/* don't send a redundant nick change */
if(!IsDigit(source_p->name[0]))
change_remote_nick(client_p, source_p, SAVE_NICKTS, source_p->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_p, "%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 |= FLAGS_KILLED;
exit_client(NULL, target_p, &me, "Nick collision(new)");
source_p->flags |= FLAGS_KILLED;
exit_client(client_p, source_p, &me, "Nick collision(old)");
}
return 0;
}
else
{
sameuser = !irccmp(target_p->username, source_p->username) &&
!irccmp(target_p->host, source_p->host);
if((sameuser && newts < target_p->tsinfo) ||
(!sameuser && newts > target_p->tsinfo))
{
if(sameuser)
sendto_realops_flags(UMODE_ALL, L_ALL,
"Nick change collision from %s to %s(%s <- %s)(older %s)",
source_p->name, target_p->name,
target_p->from->name, client_p->name, action);
else
sendto_realops_flags(UMODE_ALL, L_ALL,
"Nick change collision from %s to %s(%s <- %s)(newer %s)",
source_p->name, target_p->name,
target_p->from->name, client_p->name, action);
if(use_save)
{
ServerStats.is_save++;
/* can't broadcast a SAVE because the
* nickchange has happened at client_p
* but not in other directions -- jilles */
sendto_one(client_p, ":%s SAVE %s %" RBTT_FMT, me.id,
source_p->id, newts);
/* send a :<id> NICK <id> <ts> (!) */
if(!IsDigit(source_p->name[0]))
change_remote_nick(client_p, source_p, SAVE_NICKTS,
source_p->id, 1);
}
else
{
ServerStats.is_kill++;
sendto_one_numeric(target_p, ERR_NICKCOLLISION,
form_str(ERR_NICKCOLLISION), target_p->name);
/* kill the client issuing the nickchange */
kill_client_serv_butone(client_p, source_p,
"%s (Nick change collision)", me.name);
source_p->flags |= FLAGS_KILLED;
if(sameuser)
exit_client(client_p, source_p, &me, "Nick collision(old)");
else
exit_client(client_p, source_p, &me, "Nick collision(new)");
}
return 0;
}
else
{
if(sameuser)
sendto_realops_flags(UMODE_ALL, L_ALL,
"Nick collision on %s(%s <- %s)(older %s)",
target_p->name, target_p->from->name,
client_p->name, action);
else
sendto_realops_flags(UMODE_ALL, L_ALL,
"Nick collision on %s(%s <- %s)(newer %s)",
target_p->name, target_p->from->name,
client_p->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_p, target_p,
"%s (Nick collision)", me.name);
ServerStats.is_kill++;
target_p->flags |= FLAGS_KILLED;
(void)exit_client(client_p, target_p, &me, "Nick collision");
}
}
}
change_remote_nick(client_p, source_p, newts, nick, 1);
return 0;
}
static int
register_client(struct Client *client_p, struct Client *server,
const char *nick, time_t newts, int parc, const char *parv[])
{
struct Client *source_p;
struct User *user;
struct nd_entry *nd;
const char *m;
int flag;
source_p = make_client(client_p);
user = make_user(source_p);
source_p->hopcount = atoi(parv[2]);
source_p->tsinfo = newts;
strcpy(source_p->user->name, nick);
source_p->name = source_p->user->name;
rb_strlcpy(source_p->username, parv[5], sizeof(source_p->username));
rb_strlcpy(source_p->host, parv[6], sizeof(source_p->host));
if(parc == 10)
{
rb_strlcpy(source_p->info, parv[9], sizeof(source_p->info));
rb_strlcpy(source_p->sockhost, parv[7], sizeof(source_p->sockhost));
rb_strlcpy(source_p->id, parv[8], sizeof(source_p->id));
add_to_hash(HASH_ID, source_p->id, source_p);
}
else
{
rb_strlcpy(source_p->info, parv[8], sizeof(source_p->info));
if((server = find_server(NULL, parv[7])) == NULL)
{
sendto_realops_flags(UMODE_ALL, L_ALL,
"Ghost killed: %s on invalid server %s",
source_p->name, parv[7]);
kill_client(client_p, source_p, "%s (Server doesn't exist)", me.name);
free_user(source_p->user, source_p);
free_client(source_p);
return 0;
}
}
rb_dlinkAddTail(source_p, &source_p->node, &global_client_list);
/* server is guaranteed to exist at this point */
source_p->servptr = server;
rb_dlinkAdd(source_p, &source_p->lnode, &source_p->servptr->serv->users);
/* remove any nd entries for this nick */
if((nd = hash_find_nd(nick)))
free_nd_entry(nd);
add_to_hash(HASH_CLIENT, nick, source_p);
add_to_hash(HASH_HOSTNAME, source_p->host, source_p);
inc_global_cidr_count(source_p);
monitor_signon(source_p);
m = &parv[4][1];
while(*m)
{
flag = UserModeBitmask(*m);
#ifdef ENABLE_SERVICES
if(flag & UMODE_SERVICE)
{
int hit = 0;
rb_dlink_node *ptr;
RB_DLINK_FOREACH(ptr, service_list.head)
{
if(!irccmp((const char *)ptr->data, source_p->servptr->name))
{
hit++;
break;
}
}
if(!hit)
{
m++;
continue;
}
}
#endif
/* increment +i count if theyre invis */
if(!(source_p->umodes & UMODE_INVISIBLE) && (flag & UMODE_INVISIBLE))
Count.invisi++;
/* increment opered count if theyre opered */
if(!(source_p->umodes & UMODE_OPER) && (flag & UMODE_OPER))
Count.oper++;
source_p->umodes |= (flag & SEND_UMODES);
m++;
}
SetRemoteClient(source_p);
if(++Count.total > Count.max_tot)
Count.max_tot = Count.total;
/* fake direction */
if(source_p->servptr->from != source_p->from)
{
struct Client *target_p = source_p->servptr->from;
sendto_realops_flags(UMODE_DEBUG, L_ALL,
"Bad User [%s] :%s USER %s@%s %s, != %s[%s]",
client_p->name, source_p->name,
source_p->username, source_p->host,
source_p->servptr->name, target_p->name, target_p->from->name);
kill_client(client_p, source_p,
"%s (NICK from wrong direction (%s != %s))",
me.name, source_p->servptr->name, target_p->from->name);
source_p->flags |= FLAGS_KILLED;
return exit_client(source_p, source_p, &me, "USER server wrong direction");
}
introduce_client(client_p, source_p);
return 0;
}
/* Check if we can do SAVE. target_p can be a client to save or a
* server introducing a client -- jilles */
static int
can_save(struct Client *target_p)
{
struct Client *serv_p;
if(MyClient(target_p))
return 1;
if(!has_id(target_p))
return 0;
serv_p = IsServer(target_p) ? target_p : target_p->servptr;
while(serv_p != NULL && serv_p != &me)
{
if(!(serv_p->serv->caps & CAP_SAVE))
return 0;
serv_p = serv_p->servptr;
}
return serv_p == &me;
}
static void
save_user(struct Client *client_p, struct Client *source_p, struct Client *target_p)
{
if(!MyConnect(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_flags(UMODE_ALL, 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_p->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 |= FLAGS_KILLED;
exit_client(NULL, target_p, &me, "Nick collision (no SAVE support)");
return;
}
sendto_server(client_p, NULL, CAP_SAVE | CAP_TS6, NOCAPS, ":%s SAVE %s %" RBTT_FMT,
source_p->id, target_p->id, target_p->tsinfo);
sendto_server(client_p, NULL, CAP_TS6, CAP_SAVE, ":%s NICK %s :%" RBTT_FMT,
target_p->id, target_p->id, (time_t)SAVE_NICKTS);
sendto_server(client_p, NULL, NOCAPS, CAP_TS6, ":%s NICK %s :%" RBTT_FMT,
target_p->name, target_p->id, (time_t)SAVE_NICKTS);
if(!IsMe(client_p))
sendto_realops_flags(UMODE_SKILL, L_ALL,
"Received SAVE message for %s from %s",
target_p->name, source_p->name);
if(MyClient(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);
}
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