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construct/modules/m_signon.c
Elizabeth Myers 3c7d6fcce7 Message handlers should return void.
Also fix up some return values and stuff to use bool (or void if
nothing). I just did it whilst I was here.

According to jilles, the return value used to signify whether or not the
client had exited. This was error-prone and was fixed a long, long time
ago, but the return value was left int for historical reasons.

Since the return type is not used (and has no clear use case anyway),
it's safe to just get rid of it.
2016-03-09 01:37:03 -06:00

417 lines
12 KiB
C

/* modules/m_signon.c
* Copyright (C) 2006 Michael Tharp <gxti@partiallystapled.com>
* Copyright (C) 2006 charybdis development team
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1.Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2.Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3.The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "stdinc.h"
#include "send.h"
#include "channel.h"
#include "client.h"
#include "common.h"
#include "config.h"
#include "ircd.h"
#include "numeric.h"
#include "s_conf.h"
#include "s_serv.h"
#include "hash.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
#include "whowas.h"
#include "monitor.h"
#include "s_stats.h"
#include "snomask.h"
#include "match.h"
#include "s_user.h"
static const char signon_desc[] = "Provides account login/logout support for services";
static void me_svslogin(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void ms_signon(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void send_signon(struct Client *, struct Client *, const char *, const char *, const char *, unsigned int, const char *);
struct Message svslogin_msgtab = {
"SVSLOGIN", 0, 0, 0, 0,
{mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_svslogin, 6}, mg_ignore}
};
struct Message signon_msgtab = {
"SIGNON", 0, 0, 0, 0,
{mg_ignore, mg_ignore, {ms_signon, 6}, mg_ignore, mg_ignore, mg_ignore}
};
mapi_clist_av1 signon_clist[] = {
&svslogin_msgtab, &signon_msgtab, NULL
};
DECLARE_MODULE_AV2(signon, NULL, NULL, signon_clist, NULL, NULL, NULL, NULL, signon_desc);
#define NICK_VALID 1
#define USER_VALID 2
#define HOST_VALID 4
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;
}
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 void
me_svslogin(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
int parc, const char *parv[])
{
struct Client *target_p, *exist_p;
char nick[NICKLEN+1], login[NICKLEN+1];
char user[USERLEN+1], host[HOSTLEN+1];
int valid = 0;
if(!(source_p->flags & FLAGS_SERVICE))
{
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Non-service server %s attempting to execute services-only command SVSLOGIN", source_p->name);
return;
}
if((target_p = find_client(parv[1])) == NULL)
return;
if(!MyClient(target_p) && !IsUnknown(target_p))
return;
if(clean_nick(parv[2], 0))
{
rb_strlcpy(nick, parv[2], NICKLEN + 1);
valid |= NICK_VALID;
}
else if(*target_p->name)
rb_strlcpy(nick, target_p->name, NICKLEN + 1);
else
strcpy(nick, "*");
if(clean_username(parv[3]))
{
rb_strlcpy(user, parv[3], USERLEN + 1);
valid |= USER_VALID;
}
else
rb_strlcpy(user, target_p->username, USERLEN + 1);
if(clean_host(parv[4]))
{
rb_strlcpy(host, parv[4], HOSTLEN + 1);
valid |= HOST_VALID;
}
else
rb_strlcpy(host, target_p->host, HOSTLEN + 1);
if(*parv[5] == '*')
{
if(target_p->user)
rb_strlcpy(login, target_p->user->suser, NICKLEN + 1);
else
login[0] = '\0';
}
else if(!strcmp(parv[5], "0"))
login[0] = '\0';
else
rb_strlcpy(login, parv[5], NICKLEN + 1);
/* Login (mostly) follows nick rules. */
if(*login && !clean_nick(login, 0))
return;
if((exist_p = find_person(nick)) && target_p != exist_p)
{
char buf[BUFSIZE];
if(MyClient(exist_p))
sendto_one(exist_p, ":%s KILL %s :(Nickname regained by services)",
me.name, exist_p->name);
exist_p->flags |= FLAGS_KILLED;
kill_client_serv_butone(NULL, exist_p, "%s (Nickname regained by services)",
me.name);
sendto_realops_snomask(SNO_SKILL, L_ALL,
"Nick collision due to SVSLOGIN on %s",
nick);
snprintf(buf, sizeof(buf), "Killed (%s (Nickname regained by services))",
me.name);
exit_client(NULL, exist_p, &me, buf);
}
else if((exist_p = find_client(nick)) && IsUnknown(exist_p) && exist_p != target_p)
{
exit_client(NULL, exist_p, &me, "Overridden");
}
if(*login)
{
/* Strip leading digits, unless it's purely numeric. */
const char *p = login;
while(IsDigit(*p))
p++;
if(!*p)
p = login;
sendto_one(target_p, form_str(RPL_LOGGEDIN), me.name, EmptyString(target_p->name) ? "*" : target_p->name,
nick, user, host, p, p);
}
else
sendto_one(target_p, form_str(RPL_LOGGEDOUT), me.name, EmptyString(target_p->name) ? "*" : target_p->name,
nick, user, host);
if(IsUnknown(target_p))
{
struct User *user_p = make_user(target_p);
if(valid & NICK_VALID)
strcpy(target_p->preClient->spoofnick, nick);
if(valid & USER_VALID)
strcpy(target_p->preClient->spoofuser, user);
if(valid & HOST_VALID)
strcpy(target_p->preClient->spoofhost, host);
rb_strlcpy(user_p->suser, login, NICKLEN + 1);
}
else
{
char note[NICKLEN + 10];
send_signon(NULL, target_p, nick, user, host, rb_current_time(), login);
snprintf(note, NICKLEN + 10, "Nick: %s", target_p->name);
rb_note(target_p->localClient->F, note);
}
}
static void
ms_signon(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
int parc, const char *parv[])
{
struct Client *target_p;
int newts, sameuser;
char login[NICKLEN+1];
if(!clean_nick(parv[1], 0))
{
ServerStats.is_kill++;
sendto_realops_snomask(SNO_DEBUG, L_ALL,
"Bad Nick from SIGNON: %s From: %s(via %s)",
parv[1], source_p->servptr->name, client_p->name);
/* if source_p has an id, kill_client_serv_butone() will
* send a kill to client_p, otherwise do it here */
if (!has_id(source_p))
sendto_one(client_p, ":%s KILL %s :%s (Bad nickname from SIGNON)",
get_id(&me, client_p), parv[1], me.name);
kill_client_serv_butone(client_p, source_p, "%s (Bad nickname from SIGNON)",
me.name);
source_p->flags |= FLAGS_KILLED;
exit_client(NULL, source_p, &me, "Bad nickname from SIGNON");
return;
}
if(!clean_username(parv[2]) || !clean_host(parv[3]))
{
ServerStats.is_kill++;
sendto_realops_snomask(SNO_DEBUG, L_ALL,
"Bad user@host from SIGNON: %s@%s From: %s(via %s)",
parv[2], parv[3], source_p->servptr->name, client_p->name);
/* if source_p has an id, kill_client_serv_butone() will
* send a kill to client_p, otherwise do it here */
if (!has_id(source_p))
sendto_one(client_p, ":%s KILL %s :%s (Bad user@host from SIGNON)",
get_id(&me, client_p), parv[1], me.name);
kill_client_serv_butone(client_p, source_p, "%s (Bad user@host from SIGNON)",
me.name);
source_p->flags |= FLAGS_KILLED;
exit_client(NULL, source_p, &me, "Bad user@host from SIGNON");
return;
}
newts = atol(parv[4]);
if(!strcmp(parv[5], "0"))
login[0] = '\0';
else if(*parv[5] != '*')
{
if (clean_nick(parv[5], 0))
rb_strlcpy(login, parv[5], NICKLEN + 1);
else
return;
}
else
login[0] = '\0';
target_p = find_named_client(parv[1]);
if(target_p != NULL && target_p != source_p)
{
/* In case of collision, follow NICK rules. */
/* XXX this is duplicated code and does not do SAVE */
if(IsUnknown(target_p))
exit_client(NULL, target_p, &me, "Overridden");
else
{
if(!newts || !target_p->tsinfo || (newts == target_p->tsinfo) || !source_p->user)
{
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Nick change collision from SIGNON from %s to %s(%s <- %s)(both killed)",
source_p->name, target_p->name, target_p->from->name,
client_p->name);
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_GENERAL, L_ALL,
"Nick change collision from SIGNON from %s to %s(%s <- %s)(older killed)",
source_p->name, target_p->name,
target_p->from->name, client_p->name);
else
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Nick change collision from SIGNON from %s to %s(%s <- %s)(newer killed)",
source_p->name, target_p->name,
target_p->from->name, client_p->name);
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;
}
else
{
if(sameuser)
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Nick collision from SIGNON on %s(%s <- %s)(older killed)",
target_p->name, target_p->from->name,
client_p->name);
else
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Nick collision from SIGNON on %s(%s <- %s)(newer killed)",
target_p->name, target_p->from->name,
client_p->name);
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");
}
}
}
}
send_signon(client_p, source_p, parv[1], parv[2], parv[3], newts, login);
}
static void
send_signon(struct Client *client_p, struct Client *target_p,
const char *nick, const char *user, const char *host,
unsigned int newts, const char *login)
{
sendto_server(client_p, NULL, CAP_TS6, NOCAPS, ":%s SIGNON %s %s %s %ld %s",
use_id(target_p), nick, user, host,
(long) target_p->tsinfo, *login ? login : "0");
strcpy(target_p->user->suser, login);
change_nick_user_host(target_p, nick, user, host, newts, "Signing %s (%s)", *login ? "in" : "out", nick);
}