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solanum-vs-hackint-and-char.../modules/core/m_nick.c
Doug Freed c1b01bf5ec client: refactor del_all_accepts to allow skipping own accept list 
This allows reusing this function for other uses that just need to
remove this client from others' accept lists on nick change and not have
duplicates of this code everywhere
2023-11-06 17:31:44 +00:00

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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) 2002-2005 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
*/
#include "stdinc.h"
#include "client.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 "send.h"
#include "channel.h"
#include "logger.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
#include "packet.h"
#include "scache.h"
#include "s_newconf.h"
#include "monitor.h"
#include "s_assert.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 void mr_nick(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void m_nick(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void mc_nick(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void ms_nick(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void ms_uid(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void ms_euid(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void ms_save(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static bool can_save(struct Client *);
static void save_user(struct Client *, struct Client *, struct Client *);
static void bad_nickname(struct Client *, const char *);
static void change_remote_nick(struct Client *, struct 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(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 void register_client(struct Client *client_p, struct Client *server,
const char *nick, time_t newts, int parc, const char *parv[]);
static void perform_nick_collides(struct Client *, struct Client *,
struct Client *, int, const char **,
time_t, const char *, const char *);
static void perform_nickchange_collides(struct Client *, struct Client *,
struct Client *, int, const char **, time_t, const char *);
static int h_local_nick_change;
static int h_remote_nick_change;
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 };
mapi_hlist_av1 nick_hlist[] = {
{ "local_nick_change", &h_local_nick_change },
{ "remote_nick_change", &h_remote_nick_change },
{ NULL, 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, nick_hlist, NULL, NULL, NULL, nick_desc);
/* mr_nick()
* parv[1] = nickname
*/
static void
mr_nick(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
struct Client *target_p;
char nick[NICKLEN];
if (strlen(client_p->id) == 3 || (source_p->preClient && !EmptyString(source_p->preClient->id)))
{
exit_client(client_p, client_p, client_p, "Mixing client and server protocol");
return;
}
if(parc < 2 || EmptyString(parv[1]))
{
sendto_one(source_p, form_str(ERR_NONICKNAMEGIVEN),
me.name, EmptyString(source_p->name) ? "*" : source_p->name);
return;
}
/* copy the nick and terminate it */
rb_strlcpy(nick, parv[1], ConfigFileEntry.nicklen);
/* check the nickname is ok */
if(!clean_nick(nick, 1))
{
sendto_one(source_p, form_str(ERR_ERRONEUSNICKNAME),
me.name, EmptyString(source_p->name) ? "*" : source_p->name, parv[1]);
return;
}
/* check if the nick is resv'd */
if(find_nick_resv(nick))
{
sendto_one(source_p, form_str(ERR_ERRONEUSNICKNAME),
me.name, EmptyString(source_p->name) ? "*" : source_p->name, nick);
return;
}
if(rb_dictionary_find(nd_dict, nick))
{
sendto_one(source_p, form_str(ERR_UNAVAILRESOURCE),
me.name, EmptyString(source_p->name) ? "*" : source_p->name, nick);
return;
}
if((target_p = find_named_client(nick)) == NULL)
set_initial_nick(client_p, source_p, nick);
else if(source_p == target_p)
rb_strlcpy(source_p->name, nick, sizeof(source_p->name));
else
sendto_one(source_p, form_str(ERR_NICKNAMEINUSE), me.name, "*", nick);
}
/* m_nick()
* parv[1] = nickname
*/
static void
m_nick(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
struct Client *target_p;
char nick[NICKLEN];
if(parc < 2 || EmptyString(parv[1]))
{
sendto_one(source_p, form_str(ERR_NONICKNAMEGIVEN), me.name, source_p->name);
return;
}
/* 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], ConfigFileEntry.nicklen);
/* check the nickname is ok */
if(!clean_nick(nick, 1))
{
sendto_one(source_p, form_str(ERR_ERRONEUSNICKNAME), me.name, source_p->name, nick);
return;
}
if(!IsExemptResv(source_p) && find_nick_resv(nick))
{
sendto_one(source_p, form_str(ERR_ERRONEUSNICKNAME), me.name, source_p->name, nick);
return;
}
if(rb_dictionary_find(nd_dict, nick))
{
sendto_one(source_p, form_str(ERR_UNAVAILRESOURCE),
me.name, EmptyString(source_p->name) ? "*" : source_p->name, nick);
return;
}
if((target_p = find_named_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, source_p->name, nick);
return;
}
else
change_local_nick(client_p, source_p, 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, 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))
{
bad_nickname(client_p, 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_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,
parc, parv, newts, parv[1]);
}
static void
ms_nick(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, 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_p->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_p->name, nick, server);
ilog(L_SERVER, "Link %s cancelled, TS5 nickname %s on %s introduced (old server?)",
client_p->name, nick, server);
exit_client(client_p, client_p, &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, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
struct Client *target_p;
time_t newts = 0;
char squitreason[120];
newts = atol(parv[3]);
if(parc != 10)
{
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"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);
snprintf(squitreason, sizeof squitreason,
"Excess parameters (%d) to %s command, expecting %d",
parc, "UID", 10);
exit_client(client_p, client_p, client_p, squitreason);
return;
}
/* if nicks erroneous, or too long, kill */
if(!clean_nick(parv[1], 0))
{
bad_nickname(client_p, parv[1]);
return;
}
if(!clean_uid(parv[8], source_p->id))
{
snprintf(squitreason, sizeof squitreason,
"Invalid UID %s for nick %s on %s/%s",
parv[8], parv[1], source_p->name, source_p->id);
exit_client(client_p, client_p, client_p, squitreason);
return;
}
if(!clean_username(parv[5]) || !clean_host(parv[6]))
{
ServerStats.is_kill++;
sendto_realops_snomask(SNO_DEBUG, L_NETWIDE,
"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;
}
/* check length of clients gecos */
if(strlen(parv[9]) > REALLEN)
{
char *s = LOCAL_COPY(parv[9]);
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "Long realname from server %s for %s",
source_p->name, parv[1]);
s[REALLEN] = '\0';
parv[9] = s;
}
target_p = find_named_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]);
}
/* 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, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
struct Client *target_p;
time_t newts = 0;
char squitreason[120];
newts = atol(parv[3]);
if(parc != 12)
{
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Dropping server %s due to (invalid) command 'EUID' "
"with %d arguments (expecting 12)", client_p->name, parc);
ilog(L_SERVER, "Excess parameters (%d) for command 'EUID' from %s.",
parc, client_p->name);
snprintf(squitreason, sizeof squitreason,
"Excess parameters (%d) to %s command, expecting %d",
parc, "EUID", 12);
exit_client(client_p, client_p, client_p, squitreason);
return;
}
/* if nicks erroneous, or too long, kill */
if(!clean_nick(parv[1], 0))
{
bad_nickname(client_p, parv[1]);
return;
}
if(!clean_uid(parv[8], source_p->id))
{
snprintf(squitreason, sizeof squitreason,
"Invalid UID %s for nick %s on %s/%s",
parv[8], parv[1], source_p->name, source_p->id);
exit_client(client_p, client_p, client_p, squitreason);
return;
}
if(!clean_username(parv[5]) || !clean_host(parv[6]))
{
ServerStats.is_kill++;
sendto_realops_snomask(SNO_DEBUG, L_NETWIDE,
"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;
}
if(strcmp(parv[9], "*") && !clean_host(parv[9]))
{
ServerStats.is_kill++;
sendto_realops_snomask(SNO_DEBUG, L_NETWIDE,
"Bad realhost: %s From: %s(via %s)",
parv[9], source_p->name, client_p->name);
sendto_one(client_p, ":%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_NETWIDE, "Long realname from server %s for %s",
source_p->name, parv[1]);
s[REALLEN] = '\0';
parv[11] = s;
}
target_p = find_named_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]);
}
/* ms_save()
* parv[1] - UID
* parv[2] - TS
*/
static void
ms_save(struct MsgBuf *msgbuf_p, 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;
if (!IsPerson(target_p))
sendto_realops_snomask(SNO_GENERAL, 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_snomask(SNO_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_snomask(SNO_SKILL, L_ALL,
"Ignored SAVE message for %s from %s",
target_p->name, source_p->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(!IsUserChar(*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(!IsHostChar(*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(!IsDigit(*uid++))
return false;
for(; *uid; uid++)
{
len++;
if(!IsIdChar(*uid))
return false;
}
if(len != IDLEN - 1)
return false;
return true;
}
static void
set_initial_nick(struct Client *client_p, struct Client *source_p, char *nick)
{
char note[NICKLEN + 10];
/* This had to be copied here to avoid problems.. */
source_p->tsinfo = rb_current_time();
if(source_p->name[0])
del_from_client_hash(source_p->name, source_p);
rb_strlcpy(source_p->name, nick, sizeof(source_p->name));
add_to_client_hash(nick, source_p);
snprintf(note, sizeof(note), "Nick: %s", nick);
rb_note(client_p->localClient->F, note);
if(source_p->flags & FLAGS_SENTUSER)
{
/* got user, heres nick. */
register_local_user(client_p, source_p);
}
}
static void
change_local_nick(struct Client *client_p, struct Client *source_p,
char *nick, int dosend)
{
struct Channel *chptr;
char note[NICKLEN + 10];
int samenick;
hook_cdata hook_info;
if (dosend)
{
chptr = find_bannickchange_channel(source_p);
if (chptr != NULL)
{
sendto_one_numeric(source_p, ERR_BANNICKCHANGE,
form_str(ERR_BANNICKCHANGE),
nick, chptr->chname);
return;
}
if((source_p->localClient->last_nick_change + ConfigFileEntry.max_nick_time) < rb_current_time())
source_p->localClient->number_of_nick_changes = 0;
source_p->localClient->last_nick_change = rb_current_time();
source_p->localClient->number_of_nick_changes++;
if(ConfigFileEntry.anti_nick_flood && !IsOperGeneral(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;
}
}
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);
}
hook_info.client = source_p;
hook_info.arg1 = source_p->name;
hook_info.arg2 = nick;
call_hook(h_local_nick_change, &hook_info);
sendto_realops_snomask(SNO_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, NOCAPS, NOCAPS, ":%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)
{
whowas_add_history(source_p, 1);
if (dosend)
{
sendto_server(client_p, NULL, CAP_TS6, NOCAPS, ":%s NICK %s :%ld",
use_id(source_p), nick, (long) source_p->tsinfo);
}
}
/* Finally, add to hash */
del_from_client_hash(source_p->name, source_p);
rb_strlcpy(source_p->name, nick, sizeof(source_p->name));
add_to_client_hash(nick, source_p);
if(!samenick)
monitor_signon(source_p);
/* Make sure everyone that has this client on its accept list
* loses that reference.
*/
del_all_accepts(source_p, false);
snprintf(note, sizeof(note), "Nick: %s", nick);
rb_note(client_p->localClient->F, note);
return;
}
/*
* change_remote_nick()
*/
static void
change_remote_nick(struct Client *client_p, struct Client *source_p,
time_t newts, const char *nick, int dosend)
{
struct Client *target_p;
rb_dlink_node *ptr, *next_ptr;
struct nd_entry *nd;
int samenick = irccmp(source_p->name, nick) ? 0 : 1;
hook_cdata hook_info;
/* client changing their nick - dont reset ts if its same */
if(!samenick)
{
source_p->tsinfo = newts ? newts : rb_current_time();
monitor_signoff(source_p);
}
hook_info.client = source_p;
hook_info.arg1 = source_p->name;
hook_info.arg2 = nick;
call_hook(h_remote_nick_change, &hook_info);
sendto_common_channels_local(source_p, NOCAPS, NOCAPS, ":%s!%s@%s NICK :%s",
source_p->name, source_p->username, source_p->host, nick);
if(source_p->user)
{
whowas_add_history(source_p, 1);
if (dosend)
{
sendto_server(client_p, NULL, CAP_TS6, NOCAPS, ":%s NICK %s :%ld",
use_id(source_p), nick, (long) source_p->tsinfo);
}
}
del_from_client_hash(source_p->name, source_p);
/* invalidate nick delay when a remote client uses the nick.. */
if((nd = rb_dictionary_retrieve(nd_dict, nick)))
free_nd_entry(nd);
rb_strlcpy(source_p->name, nick, sizeof(source_p->name));
add_to_client_hash(nick, source_p);
if(!samenick)
monitor_signon(source_p);
/* remove all accepts pointing to the client */
RB_DLINK_FOREACH_SAFE(ptr, next_ptr, source_p->on_allow_list.head)
{
target_p = ptr->data;
if (!has_common_channel(source_p, target_p))
{
rb_dlinkFindDestroy(source_p, &target_p->localClient->allow_list);
rb_dlinkDestroy(ptr, &source_p->on_allow_list);
}
}
}
static void
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_snomask(SNO_SKILL, L_NETWIDE,
"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 %ld", me.id,
uid, (long)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;
}
/* 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 %ld", me.id,
uid, (long)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;
}
else
{
if(sameuser)
sendto_realops_snomask(SNO_SKILL, L_NETWIDE,
"Nick collision on %s(%s <- %s)(older %s)",
target_p->name, target_p->from->name,
client_p->name, action);
else
sendto_realops_snomask(SNO_SKILL, L_NETWIDE,
"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, source_p,
nick, newts, parc, parv);
}
}
}
static void
perform_nickchange_collides(struct Client *source_p, struct Client *client_p,
struct 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_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_snomask(SNO_SKILL, L_NETWIDE,
"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 %ld", me.id,
source_p->id, (long)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;
}
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_snomask(SNO_SKILL, L_NETWIDE,
"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_snomask(SNO_SKILL, L_NETWIDE,
"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 %ld", me.id,
source_p->id, (long)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(source_p, ERR_NICKCOLLISION,
form_str(ERR_NICKCOLLISION), source_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;
}
else
{
if(sameuser)
sendto_realops_snomask(SNO_SKILL, L_NETWIDE,
"Nick collision on %s(%s <- %s)(older %s)",
target_p->name, target_p->from->name,
client_p->name, action);
else
sendto_realops_snomask(SNO_SKILL, L_NETWIDE,
"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);
}
static void
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);
rb_dlinkAddTail(source_p, &source_p->node, &global_client_list);
source_p->hopcount = atoi(parv[2]);
source_p->tsinfo = newts;
rb_strlcpy(source_p->name, nick, sizeof(source_p->name));
rb_strlcpy(source_p->username, parv[5], sizeof(source_p->username));
rb_strlcpy(source_p->host, parv[6], sizeof(source_p->host));
rb_strlcpy(source_p->orighost, source_p->host, sizeof(source_p->orighost));
if(parc == 12)
{
rb_strlcpy(source_p->info, parv[11], 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_id_hash(source_p->id, source_p);
if (strcmp(parv[9], "*"))
{
rb_strlcpy(source_p->orighost, parv[9], sizeof(source_p->orighost));
if (irccmp(source_p->host, source_p->orighost))
SetDynSpoof(source_p);
}
if (strcmp(parv[10], "*"))
rb_strlcpy(source_p->user->suser, parv[10], sizeof(source_p->user->suser));
}
else 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_id_hash(source_p->id, source_p);
}
else
{
s_assert(0);
}
/* remove any nd entries for this nick */
if((nd = rb_dictionary_retrieve(nd_dict, nick)))
free_nd_entry(nd);
add_to_client_hash(nick, source_p);
add_to_hostname_hash(source_p->orighost, source_p);
monitor_signon(source_p);
m = &parv[4][1];
while(*m)
{
flag = user_modes[(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_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;
m++;
}
if(IsOper(source_p) && !IsService(source_p))
rb_dlinkAddAlloc(source_p, &oper_list);
SetRemoteClient(source_p);
if(++Count.total > Count.max_tot)
Count.max_tot = Count.total;
source_p->servptr = server;
rb_dlinkAdd(source_p, &source_p->lnode, &source_p->servptr->serv->users);
call_hook(h_new_remote_user, source_p);
introduce_client(client_p, source_p, user, 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(struct Client *target_p)
{
struct Client *serv_p;
if (MyClient(target_p))
return true;
if (!has_id(target_p))
return false;
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 false;
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_snomask(SNO_GENERAL, L_NETWIDE,
"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;
(void) 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 %ld",
source_p->id, target_p->id, (long)target_p->tsinfo);
sendto_server(client_p, NULL, CAP_TS6, CAP_SAVE, ":%s NICK %s :%ld",
target_p->id, target_p->id, (long)SAVE_NICKTS);
if (!IsMe(client_p))
sendto_realops_snomask(SNO_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);
}
static void bad_nickname(struct Client *client_p, const char *nick)
{
char squitreason[100];
sendto_wallops_flags(UMODE_WALLOP, &me,
"Squitting %s because of bad nickname %s (NICKLEN mismatch?)",
client_p->name, nick);
sendto_server(NULL, NULL, CAP_TS6, NOCAPS,
":%s WALLOPS :Squitting %s because of bad nickname %s (NICKLEN mismatch?)",
me.id, client_p->name, nick);
ilog(L_SERVER, "Link %s cancelled, bad nickname %s sent (NICKLEN mismatch?)",
client_p->name, nick);
snprintf(squitreason, sizeof squitreason,
"Bad nickname introduced [%s]", nick);
exit_client(client_p, client_p, &me, squitreason);
}
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