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solanum-vs-hackint-and-char.../modules/core/m_server.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

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/*
* ircd-ratbox: A slightly useful ircd.
* m_server.c: Introduces a server.
*
* 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" /* client struct */
#include "common.h"
#include "hash.h" /* add_to_client_hash */
#include "match.h"
#include "ircd.h" /* me */
#include "numeric.h" /* ERR_xxx */
#include "s_conf.h" /* struct ConfItem */
#include "s_newconf.h"
#include "logger.h" /* log level defines */
#include "s_serv.h" /* server_estab, check_server */
#include "s_stats.h" /* ServerStats */
#include "scache.h"
#include "send.h" /* sendto_one */
#include "msg.h"
#include "parse.h"
#include "modules.h"
static const char server_desc[] =
"Provides the TS6 commands to introduce a new server to the network";
static void mr_server(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void ms_server(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static void ms_sid(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static bool bogus_host(const char *host);
static void set_server_gecos(struct Client *, const char *);
struct Message server_msgtab = {
"SERVER", 0, 0, 0, 0,
{{mr_server, 4}, mg_reg, mg_ignore, {ms_server, 4}, mg_ignore, mg_reg}
};
struct Message sid_msgtab = {
"SID", 0, 0, 0, 0,
{mg_ignore, mg_reg, mg_ignore, {ms_sid, 5}, mg_ignore, mg_reg}
};
mapi_clist_av1 server_clist[] = { &server_msgtab, &sid_msgtab, NULL };
DECLARE_MODULE_AV2(server, NULL, NULL, server_clist, NULL, NULL, NULL, NULL, server_desc);
/*
* mr_server - SERVER message handler
* parv[1] = servername
* parv[2] = serverinfo/hopcount
* parv[3] = serverinfo
*/
static void
mr_server(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
char info[REALLEN + 1];
const char *name;
struct Client *target_p;
int hop;
unsigned int required_mask;
const char *missing;
name = parv[1];
hop = atoi(parv[2]);
rb_strlcpy(info, parv[3], sizeof(info));
if (IsHandshake(client_p) && irccmp(client_p->name, name))
{
sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL,
"Server %s has unexpected name %s",
client_p->name, name);
ilog(L_SERVER, "Server %s has unexpected name %s",
log_client_name(client_p, SHOW_IP), name);
exit_client(client_p, client_p, client_p, "Server name mismatch");
return;
}
/*
* Reject a direct nonTS server connection if we're TS_ONLY -orabidoo
*/
if(!DoesTS(client_p))
{
sendto_realops_snomask(SNO_GENERAL, L_ALL, "Link %s dropped, non-TS server",
client_p->name);
exit_client(client_p, client_p, client_p, "Non-TS server");
return;
}
if(bogus_host(name))
{
exit_client(client_p, client_p, client_p, "Bogus server name");
return;
}
/* Now we just have to call check_server and everything should be
* check for us... -A1kmm. */
switch (check_server(name, client_p))
{
case -1:
if(ConfigFileEntry.warn_no_nline)
{
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Unauthorised server connection attempt from %s: "
"No entry for servername %s",
"[@255.255.255.255]", name);
ilog(L_SERVER, "Access denied, no connect block for server %s%s",
EmptyString(client_p->name) ? name : "",
log_client_name(client_p, SHOW_IP));
}
exit_client(client_p, client_p, client_p, "Invalid servername.");
return;
/* NOT REACHED */
break;
case -2:
sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL,
"Unauthorised server connection attempt from %s: "
"Bad credentials for server %s",
"[@255.255.255.255]", name);
ilog(L_SERVER, "Access denied, invalid credentials for server %s%s",
EmptyString(client_p->name) ? name : "",
log_client_name(client_p, SHOW_IP));
exit_client(client_p, client_p, client_p, "Invalid credentials.");
return;
/* NOT REACHED */
break;
case -3:
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Unauthorised server connection attempt from %s: "
"Invalid host for server %s",
"[@255.255.255.255]", name);
ilog(L_SERVER, "Access denied, invalid host for server %s%s",
EmptyString(client_p->name) ? name : "",
log_client_name(client_p, SHOW_IP));
exit_client(client_p, client_p, client_p, "Invalid host.");
return;
/* NOT REACHED */
break;
/* servername is > HOSTLEN */
case -4:
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Invalid servername %s from %s",
name, "[@255.255.255.255]");
ilog(L_SERVER, "Access denied, invalid servername from %s",
log_client_name(client_p, SHOW_IP));
exit_client(client_p, client_p, client_p, "Invalid servername.");
return;
/* NOT REACHED */
break;
case -5:
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Connection from servername %s requires SSL/TLS but is plaintext",
name);
ilog(L_SERVER, "Access denied, requires SSL/TLS but is plaintext from %s",
log_client_name(client_p, SHOW_IP));
exit_client(client_p, client_p, client_p, "Access denied, requires SSL/TLS but is plaintext");
return;
}
/* require TS6 for direct links */
if(!IsCapable(client_p, CAP_TS6))
{
sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL,
"Link %s dropped, TS6 protocol is required", name);
exit_client(client_p, client_p, client_p, "Incompatible TS version");
return;
}
/* check to ensure any "required" caps are set. --nenolod */
required_mask = capability_index_get_required(serv_capindex);
if (!IsCapable(client_p, required_mask))
{
missing = capability_index_list(serv_capindex, required_mask &
~client_p->localClient->caps);
sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL,
"Link %s dropped, required CAPABs [%s] are missing",
name, missing);
ilog(L_SERVER, "Link %s%s dropped, required CAPABs [%s] are missing",
EmptyString(client_p->name) ? name : "",
log_client_name(client_p, SHOW_IP), missing);
/* Do not use '[' in the below message because it would cause
* it to be considered potentially unsafe (might disclose IP
* addresses)
*/
sendto_one(client_p, "ERROR :Missing required CAPABs (%s)", missing);
exit_client(client_p, client_p, client_p, "Missing required CAPABs");
return;
}
if((target_p = find_server(NULL, name)))
{
/*
* This link is trying feed me a server that I already have
* access through another path -- multiple paths not accepted
* currently, kill this link immediately!!
*
* Rather than KILL the link which introduced it, KILL the
* youngest of the two links. -avalon
*
* Definitely don't do that here. This is from an unregistered
* connect - A1kmm.
*/
if (target_p->servptr->flags & FLAGS_SERVICE)
{
/* Assume any servers introduced by services
* are jupes.
* -- jilles
*/
sendto_one(client_p, "ERROR :Server juped.");
}
else
{
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Attempt to re-introduce server %s from %s",
name, "[@255.255.255.255]");
ilog(L_SERVER, "Attempt to re-introduce server %s from %s",
name, log_client_name(client_p, SHOW_IP));
sendto_one(client_p, "ERROR :Server already exists.");
}
exit_client(client_p, client_p, client_p, "Server Exists");
return;
}
if(has_id(client_p) && (target_p = find_id(client_p->id)) != NULL)
{
sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL,
"Attempt to re-introduce SID %s from %s%s (already in use by %s)",
client_p->id,
EmptyString(client_p->name) ? name : "",
client_p->name, target_p->name);
ilog(L_SERVER, "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
client_p->id,
EmptyString(client_p->name) ? name : "",
log_client_name(client_p, SHOW_IP),
target_p->name);
sendto_one(client_p, "ERROR :SID already exists.");
exit_client(client_p, client_p, client_p, "SID Exists");
return;
}
/*
* if we are connecting (Handshake), we already have the name from the
* C:line in client_p->name
*/
rb_strlcpy(client_p->name, name, sizeof(client_p->name));
set_server_gecos(client_p, info);
client_p->hopcount = hop;
server_estab(client_p);
}
/*
* ms_server - SERVER message handler
* parv[1] = servername
* parv[2] = serverinfo/hopcount
* parv[3] = serverinfo
*/
static void
ms_server(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
char info[REALLEN + 1];
/* same size as in s_misc.c */
const char *name;
struct Client *target_p;
struct remote_conf *hub_p;
hook_data_client hdata;
int hop;
int hlined = 0;
int llined = 0;
rb_dlink_node *ptr;
char squitreason[160];
name = parv[1];
hop = atoi(parv[2]);
rb_strlcpy(info, parv[3], sizeof(info));
if(find_server(NULL, name))
{
/*
* This link is trying feed me a server that I already have
* access through another path -- multiple paths not accepted
* currently, kill this link immediately!!
*
* Rather than KILL the link which introduced it, KILL the
* youngest of the two links. -avalon
*
* I think that we should exit the link itself, not the introducer,
* and we should always exit the most recently received(i.e. the
* one we are receiving this SERVER for. -A1kmm
*
* You *cant* do this, if you link somewhere, it bursts you a server
* that already exists, then sends you a client burst, you squit the
* server, but you keep getting the burst of clients on a server that
* doesnt exist, although ircd can handle it, its not a realistic
* solution.. --fl_
*/
ilog(L_SERVER, "Link %s cancelled, server %s already exists",
client_p->name, name);
snprintf(squitreason, sizeof squitreason,
"Server %s already exists",
name);
exit_client(client_p, client_p, &me, squitreason);
return;
}
/*
* User nicks never have '.' in them and server names
* must always have '.' in them.
*/
if(strchr(name, '.') == NULL)
{
/*
* Server trying to use the same name as a person. Would
* cause a fair bit of confusion. Enough to make it hellish
* for a while and servers to send stuff to the wrong place.
*/
sendto_one(client_p, "ERROR :Nickname %s already exists!", name);
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Link %s cancelled: Server/nick collision on %s",
client_p->name, name);
ilog(L_SERVER, "Link %s cancelled: Server/nick collision on %s",
client_p->name, name);
exit_client(client_p, client_p, client_p, "Nick as Server");
return;
}
/*
* Server is informing about a new server behind
* this link. Create REMOTE server structure,
* add it to list and propagate word to my other
* server links...
*/
/*
* See if the newly found server is behind a guaranteed
* leaf. If so, close the link.
*
*/
RB_DLINK_FOREACH(ptr, hubleaf_conf_list.head)
{
hub_p = ptr->data;
if(match(hub_p->server, client_p->name) && match(hub_p->host, name))
{
if(hub_p->flags & CONF_HUB)
hlined++;
else
llined++;
}
}
/* Ok, this way this works is
*
* A server can have a CONF_HUB allowing it to introduce servers
* behind it.
*
* connect {
* name = "irc.bighub.net";
* hub_mask="*";
* ...
*
* That would allow "irc.bighub.net" to introduce anything it wanted..
*
* However
*
* connect {
* name = "irc.somehub.fi";
* hub_mask="*";
* leaf_mask="*.edu";
*...
* Would allow this server in finland to hub anything but
* .edu's
*/
/* Ok, check client_p can hub the new server */
if(!hlined)
{
/* OOOPs nope can't HUB */
sendto_realops_snomask(SNO_GENERAL, L_ALL, "Non-Hub link %s introduced %s.",
client_p->name, name);
ilog(L_SERVER, "Non-Hub link %s introduced %s.",
client_p->name, name);
snprintf(squitreason, sizeof squitreason,
"No matching hub_mask for %s",
name);
exit_client(NULL, client_p, &me, squitreason);
return;
}
/* Check for the new server being leafed behind this HUB */
if(llined)
{
/* OOOPs nope can't HUB this leaf */
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Link %s introduced leafed server %s.",
client_p->name, name);
ilog(L_SERVER, "Link %s introduced leafed server %s.",
client_p->name, name);
snprintf(squitreason, sizeof squitreason,
"Matching leaf_mask for %s",
name);
exit_client(NULL, client_p, &me, squitreason);
return;
}
if(strlen(name) > HOSTLEN)
{
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Link %s introduced server with invalid servername %s",
client_p->name, name);
ilog(L_SERVER, "Link %s introduced server with invalid servername %s",
client_p->name, name);
exit_client(NULL, client_p, &me, "Invalid servername introduced.");
return;
}
target_p = make_client(client_p);
make_server(target_p);
target_p->hopcount = hop;
rb_strlcpy(target_p->name, name, sizeof(target_p->name));
set_server_gecos(target_p, info);
target_p->servptr = source_p;
SetServer(target_p);
rb_dlinkAddTail(target_p, &target_p->node, &global_client_list);
rb_dlinkAddTailAlloc(target_p, &global_serv_list);
add_to_client_hash(target_p->name, target_p);
rb_dlinkAdd(target_p, &target_p->lnode, &target_p->servptr->serv->servers);
target_p->serv->nameinfo = scache_connect(target_p->name, target_p->info, IsHidden(target_p));
sendto_server(client_p, NULL, NOCAPS, NOCAPS,
":%s SERVER %s %d :%s%s",
source_p->name, target_p->name, target_p->hopcount + 1,
IsHidden(target_p) ? "(H) " : "", target_p->info);
sendto_realops_snomask(SNO_EXTERNAL, L_ALL,
"Server %s being introduced by %s", target_p->name, source_p->name);
/* quick, dirty EOB. you know you love it. */
sendto_one(target_p, ":%s PING %s %s", get_id(&me, target_p), me.name, target_p->name);
hdata.client = source_p;
hdata.target = target_p;
call_hook(h_server_introduced, &hdata);
}
static void
ms_sid(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
struct Client *target_p;
struct remote_conf *hub_p;
hook_data_client hdata;
rb_dlink_node *ptr;
int hlined = 0;
int llined = 0;
char squitreason[160];
/* collision on the name? */
if(find_server(NULL, parv[1]) != NULL)
{
ilog(L_SERVER, "Link %s cancelled, server %s already exists",
client_p->name, parv[1]);
snprintf(squitreason, sizeof squitreason,
"Server %s already exists",
parv[1]);
exit_client(NULL, client_p, &me, squitreason);
return;
}
/* collision on the SID? */
if((target_p = find_id(parv[3])) != NULL)
{
sendto_wallops_flags(UMODE_WALLOP, &me,
"Link %s cancelled, SID %s for server %s already in use by %s",
client_p->name, parv[3], parv[1], target_p->name);
sendto_server(NULL, NULL, CAP_TS6, NOCAPS,
":%s WALLOPS :Link %s cancelled, SID %s for server %s already in use by %s",
me.id, client_p->name, parv[3], parv[1], target_p->name);
ilog(L_SERVER, "Link %s cancelled, SID %s for server %s already in use by %s",
client_p->name, parv[3], parv[1], target_p->name);
snprintf(squitreason, sizeof squitreason,
"SID %s for %s already in use by %s",
parv[3], parv[1], target_p->name);
exit_client(NULL, client_p, &me, squitreason);
return;
}
if(bogus_host(parv[1]) || strlen(parv[1]) > HOSTLEN)
{
sendto_one(client_p, "ERROR :Invalid servername");
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Link %s cancelled, servername %s invalid",
client_p->name, parv[1]);
ilog(L_SERVER, "Link %s cancelled, servername %s invalid",
client_p->name, parv[1]);
exit_client(NULL, client_p, &me, "Bogus server name");
return;
}
if(!IsDigit(parv[3][0]) || !IsIdChar(parv[3][1]) ||
!IsIdChar(parv[3][2]) || parv[3][3] != '\0')
{
sendto_one(client_p, "ERROR :Invalid SID");
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Link %s cancelled, SID %s invalid",
client_p->name, parv[3]);
ilog(L_SERVER, "Link %s cancelled, SID %s invalid",
client_p->name, parv[3]);
exit_client(NULL, client_p, &me, "Bogus SID");
return;
}
/* for the directly connected server:
* H: allows it to introduce a server matching that mask
* L: disallows it introducing a server matching that mask
*/
RB_DLINK_FOREACH(ptr, hubleaf_conf_list.head)
{
hub_p = ptr->data;
if(match(hub_p->server, client_p->name) && match(hub_p->host, parv[1]))
{
if(hub_p->flags & CONF_HUB)
hlined++;
else
llined++;
}
}
/* no matching hub_mask */
if(!hlined)
{
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Non-Hub link %s introduced %s.",
client_p->name, parv[1]);
ilog(L_SERVER, "Non-Hub link %s introduced %s.",
client_p->name, parv[1]);
snprintf(squitreason, sizeof squitreason,
"No matching hub_mask for %s",
parv[1]);
exit_client(NULL, client_p, &me, squitreason);
return;
}
/* matching leaf_mask */
if(llined)
{
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"Link %s introduced leafed server %s.",
client_p->name, parv[1]);
ilog(L_SERVER, "Link %s introduced leafed server %s.",
client_p->name, parv[1]);
snprintf(squitreason, sizeof squitreason,
"Matching leaf_mask for %s",
parv[1]);
exit_client(NULL, client_p, &me, squitreason);
return;
}
/* ok, alls good */
target_p = make_client(client_p);
make_server(target_p);
rb_strlcpy(target_p->name, parv[1], sizeof(target_p->name));
target_p->hopcount = atoi(parv[2]);
strcpy(target_p->id, parv[3]);
set_server_gecos(target_p, parv[4]);
target_p->servptr = source_p;
SetServer(target_p);
rb_dlinkAddTail(target_p, &target_p->node, &global_client_list);
rb_dlinkAddTailAlloc(target_p, &global_serv_list);
add_to_client_hash(target_p->name, target_p);
add_to_id_hash(target_p->id, target_p);
rb_dlinkAdd(target_p, &target_p->lnode, &target_p->servptr->serv->servers);
target_p->serv->nameinfo = scache_connect(target_p->name, target_p->info, IsHidden(target_p));
sendto_server(client_p, NULL, CAP_TS6, NOCAPS,
":%s SID %s %d %s :%s%s",
source_p->id, target_p->name, target_p->hopcount + 1,
target_p->id, IsHidden(target_p) ? "(H) " : "", target_p->info);
sendto_realops_snomask(SNO_EXTERNAL, L_ALL,
"Server %s being introduced by %s", target_p->name, source_p->name);
/* quick, dirty EOB. you know you love it. */
sendto_one(target_p, ":%s PING %s %s",
get_id(&me, target_p), me.name, get_id(target_p, target_p));
hdata.client = source_p;
hdata.target = target_p;
call_hook(h_server_introduced, &hdata);
}
/* set_server_gecos()
*
* input - pointer to client
* output - none
* side effects - servers gecos field is set
*/
static void
set_server_gecos(struct Client *client_p, const char *info)
{
/* check the info for [IP] */
if(info[0])
{
char *p;
char *s;
s = LOCAL_COPY(info);
/* we should only check the first word for an ip */
if((p = strchr(s, ' ')))
*p = '\0';
/* check for a ] which would symbolise an [IP] */
if(strchr(s, ']'))
{
/* set s to after the first space */
if(p)
s = ++p;
else
s = NULL;
}
/* no ], put the space back */
else if(p)
*p = ' ';
/* p may have been set to a trailing space, so check s exists and that
* it isnt \0 */
if(s && (*s != '\0'))
{
/* a space? if not (H) could be the last part of info.. */
if((p = strchr(s, ' ')))
*p = '\0';
/* check for (H) which is a hidden server */
if(!strcmp(s, "(H)"))
{
SetHidden(client_p);
/* if there was no space.. theres nothing to set info to */
if(p)
s = ++p;
else
s = NULL;
}
else if(p)
*p = ' ';
/* if there was a trailing space, s could point to \0, so check */
if(s && (*s != '\0'))
{
rb_strlcpy(client_p->info, s, sizeof(client_p->info));
return;
}
}
}
rb_strlcpy(client_p->info, "(Unknown Location)", sizeof(client_p->info));
}
/*
* bogus_host
*
* inputs - hostname
* output - true if a bogus hostname input, false if its valid
* side effects - none
*/
static bool
bogus_host(const char *host)
{
bool bogus_server = false;
const char *s;
int dots = 0;
for(s = host; *s; s++)
{
if(!IsServChar(*s))
{
bogus_server = true;
break;
}
if('.' == *s)
++dots;
}
if(!dots || bogus_server)
return true;
return false;
}
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