/**
* Kill an client identified by its nick name.
*
* Please note that after killig a client, its CLIENT cond CONNECTION
* structures are invalid. So the caller must make sure on its own not to
* access data of probably killed clients after calling this function!
*
* @param Client The client from which the command leading to the KILL has
* been received, or NULL. The KILL will no be forwarded in this
* direction. Only relevant when From is set, too.
* @param From The client from which the command originated, or NULL for
the local server.
* @param Nick The nick name to kill.
* @param Reason Text to send as reason to the client and other servers.
*/
GLOBAL bool
IRC_KillClient(CLIENT *Client, CLIENT *From, const char *Nick, const char *Reason)
{
const char *msg;
CONN_ID my_conn, conn;
CLIENT *c;
/* Do we know such a client in the network? */
c = Client_Search(Nick);
if (!c) {
LogDebug("Client with nick \"%s\" is unknown, not forwaring.", Nick);
return CONNECTED;
}
/* Inform other servers */
IRC_WriteStrServersPrefix(From ? Client : NULL,
From ? From : Client_ThisServer(),
"KILL %s :%s", Nick, Reason);
if (Client_Type(c) != CLIENT_USER && Client_Type(c) != CLIENT_GOTNICK) {
/* Target of this KILL is not a regular user, this is
* invalid! So we ignore this case if we received a
* regular KILL from the network and try to kill the
* client/connection anyway (but log an error!) if the
* origin is the local server. */
if (Client != Client_ThisServer()) {
/* Invalid KILL received from remote */
if (Client_Type(c) == CLIENT_SERVER)
msg = ERR_CANTKILLSERVER_MSG;
else
msg = ERR_NOPRIVILEGES_MSG;
return IRC_WriteErrClient(Client, msg, Client_ID(Client));
}
Log(LOG_ERR,
"Got KILL for invalid client type: %d, \"%s\"!",
Client_Type(c), Nick);
}
/* Save ID of this connection */
my_conn = Client_Conn(Client);
/* Kill the client NOW:
* - Close the local connection (if there is one),
* - Destroy the CLIENT structure for remote clients.
* Note: Conn_Close() removes the CLIENT structure as well. */
conn = Client_Conn(c);
if(conn > NONE)
Conn_Close(conn, NULL, Reason, true);
else
Client_Destroy(c, NULL, Reason, false);
/* Are we still connected or were we killed, too? */
if (my_conn > NONE && Conn_GetClient(my_conn))
return CONNECTED;
else
return DISCONNECTED;
}
GLOBAL void
Client_Exit( void )
{
CLIENT *c, *next;
int cnt;
if( NGIRCd_SignalRestart ) Client_Destroy( This_Server, "Server going down (restarting).", NULL, false );
else Client_Destroy( This_Server, "Server going down.", NULL, false );
cnt = 0;
c = My_Clients;
while(c) {
cnt++;
next = (CLIENT *)c->next;
Free_Client(&c);
c = next;
}
if (cnt)
Log(LOG_INFO, "Freed %d client structure%s.",
cnt, cnt == 1 ? "" : "s");
} /* Client_Exit */
/**
* Handler for the IRC "QUIT" command.
*
* See RFC 2812, 3.1.7 "Quit", and RFC 2813, 4.1.5 "Quit".
*
* @param Client The client from which this command has been received.
* @param Req Request structure with prefix and all parameters.
* @returns CONNECTED or DISCONNECTED.
*/
GLOBAL bool
IRC_QUIT( CLIENT *Client, REQUEST *Req )
{
CLIENT *target;
char quitmsg[LINE_LEN];
assert(Client != NULL);
assert(Req != NULL);
/* Wrong number of arguments? */
if (Req->argc > 1)
return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
Client_ID(Client), Req->command);
if (Req->argc == 1)
strlcpy(quitmsg, Req->argv[0], sizeof quitmsg);
if (Client_Type(Client) == CLIENT_SERVER) {
/* Server */
target = Client_Search(Req->prefix);
if (!target) {
Log(LOG_WARNING,
"Got QUIT from %s for unknown client!?",
Client_ID(Client));
return CONNECTED;
}
if (target != Client) {
Client_Destroy(target, "Got QUIT command.",
Req->argc == 1 ? quitmsg : NULL, true);
return CONNECTED;
} else {
Conn_Close(Client_Conn(Client), "Got QUIT command.",
Req->argc == 1 ? quitmsg : NULL, true);
return DISCONNECTED;
}
} else {
if (Req->argc == 1 && quitmsg[0] != '\"') {
/* " " to avoid confusion */
strlcpy(quitmsg, "\"", sizeof quitmsg);
strlcat(quitmsg, Req->argv[0], sizeof quitmsg-1);
strlcat(quitmsg, "\"", sizeof quitmsg );
}
/* User, Service, or not yet registered */
Conn_Close(Client_Conn(Client), "Got QUIT command.",
Req->argc == 1 ? quitmsg : NULL, true);
return DISCONNECTED;
}
} /* IRC_QUIT */
/**
* Handler for the IRC "ERROR" command.
*
* @param Client The client from which this command has been received.
* @param Req Request structure with prefix and all parameters.
* @return CONNECTED or DISCONNECTED.
*/
GLOBAL bool
IRC_ERROR(CLIENT *Client, REQUEST *Req)
{
char *msg;
assert( Client != NULL );
assert( Req != NULL );
if (Client_Type(Client) != CLIENT_GOTPASS
&& Client_Type(Client) != CLIENT_GOTPASS_2813
&& Client_Type(Client) != CLIENT_UNKNOWNSERVER
&& Client_Type(Client) != CLIENT_SERVER
&& Client_Type(Client) != CLIENT_SERVICE) {
LogDebug("Ignored ERROR command from \"%s\" ...",
Client_Mask(Client));
IRC_SetPenalty(Client, 2);
return CONNECTED;
}
if (Req->argc < 1) {
msg = "Got ERROR command";
Log(LOG_NOTICE, "Got ERROR from \"%s\"!",
Client_Mask(Client));
} else {
msg = Req->argv[0];
Log(LOG_NOTICE, "Got ERROR from \"%s\": \"%s\"!",
Client_Mask(Client), msg);
}
if (Client_Conn(Client) != NONE) {
Client_Destroy(Client, NULL, msg, false);
return DISCONNECTED;
}
return CONNECTED;
} /* IRC_ERROR */
/**
* Handler for the IRC "KILL" command.
*
* This function implements the IRC command "KILL" wich is used to selectively
* disconnect clients. It can be used by IRC operators and servers, for example
* to "solve" nick collisions after netsplits. See RFC 2812 section 3.7.1.
*
* Please note that this function is also called internally, without a real
* KILL command being received over the network! Client is Client_ThisServer()
* in this case, and the prefix in Req is NULL.
*
* @param Client The client from which this command has been received
* or Client_ThisServer() when generated interanlly.
* @param Req Request structure with prefix and all parameters.
* @returns CONNECTED or DISCONNECTED.
*/
GLOBAL bool
IRC_KILL( CLIENT *Client, REQUEST *Req )
{
CLIENT *prefix, *c;
char reason[COMMAND_LEN], *msg;
CONN_ID my_conn, conn;
assert (Client != NULL);
assert (Req != NULL);
if (Client_Type(Client) != CLIENT_SERVER && !Client_OperByMe(Client))
return IRC_WriteStrClient(Client, ERR_NOPRIVILEGES_MSG,
Client_ID(Client));
if (Req->argc != 2)
return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
Client_ID(Client), Req->command);
/* Get prefix (origin); use the client if no prefix is given. */
if (Req->prefix)
prefix = Client_Search(Req->prefix);
else
prefix = Client;
/* Log a warning message and use this server as origin when the
* prefix (origin) is invalid. */
if (!prefix) {
Log(LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
Req->prefix );
prefix = Client_ThisServer();
}
if (Client != Client_ThisServer())
Log(LOG_NOTICE|LOG_snotice,
"Got KILL command from \"%s\" for \"%s\": %s",
Client_Mask(prefix), Req->argv[0], Req->argv[1]);
/* Build reason string: Prefix the "reason" if the originator is a
* regular user, so users can't spoof KILLs of servers. */
if (Client_Type(Client) == CLIENT_USER)
snprintf(reason, sizeof(reason), "KILLed by %s: %s",
Client_ID(Client), Req->argv[1]);
else
strlcpy(reason, Req->argv[1], sizeof(reason));
/* Inform other servers */
IRC_WriteStrServersPrefix(Client, prefix, "KILL %s :%s",
Req->argv[0], reason);
/* Save ID of this connection */
my_conn = Client_Conn( Client );
/* Do we host such a client? */
c = Client_Search( Req->argv[0] );
if( c )
{
if(( Client_Type( c ) != CLIENT_USER ) &&
( Client_Type( c ) != CLIENT_GOTNICK ))
{
/* Target of this KILL is not a regular user, this is
* invalid! So we ignore this case if we received a
* regular KILL from the network and try to kill the
* client/connection anyway (but log an error!) if the
* origin is the local server. */
if( Client != Client_ThisServer( ))
{
/* Invalid KILL received from remote */
if( Client_Type( c ) == CLIENT_SERVER )
msg = ERR_CANTKILLSERVER_MSG;
else
msg = ERR_NOPRIVILEGES_MSG;
return IRC_WriteStrClient( Client, msg,
Client_ID( Client ));
}
Log( LOG_ERR, "Got KILL for invalid client type: %d, \"%s\"!",
Client_Type( c ), Req->argv[0] );
}
/* Kill the client NOW:
* - Close the local connection (if there is one),
* - Destroy the CLIENT structure for remote clients.
* Note: Conn_Close() removes the CLIENT structure as well. */
conn = Client_Conn( c );
if(conn > NONE)
Conn_Close(conn, NULL, reason, true);
else
Client_Destroy(c, NULL, reason, false);
}
else
Log( LOG_NOTICE, "Client with nick \"%s\" is unknown here.", Req->argv[0] );
/* Are we still connected or were we killed, too? */
if(( my_conn > NONE ) && ( Conn_GetClient( my_conn )))
return CONNECTED;
else
return DISCONNECTED;
} /* IRC_KILL */
GLOBAL void
Client_Destroy( CLIENT *Client, const char *LogMsg, const char *FwdMsg, bool SendQuit )
{
/* remove a client */
CLIENT *last, *c;
char msg[COMMAND_LEN];
const char *txt;
assert( Client != NULL );
txt = LogMsg ? LogMsg : FwdMsg;
if (!txt)
txt = "Reason unknown";
/* netsplit message */
if( Client->type == CLIENT_SERVER ) {
strlcpy(msg, This_Server->id, sizeof (msg));
strlcat(msg, " ", sizeof (msg));
strlcat(msg, Client->id, sizeof (msg));
}
last = NULL;
c = My_Clients;
while( c )
{
if(( Client->type == CLIENT_SERVER ) && ( c->introducer == Client ) && ( c != Client ))
{
/*
* The client that is about to be removed is a server,
* the client we are checking right now is a child of that
* server and thus has to be removed, too.
*
* Call Client_Destroy() recursively with the server as the
* new "object to be removed". This starts the cycle again, until
* all servers that are linked via the original server have been
* removed.
*/
Client_Destroy( c, NULL, msg, false );
last = NULL;
c = My_Clients;
continue;
}
if( c == Client )
{
/* found the client: remove it */
if( last ) last->next = c->next;
else My_Clients = (CLIENT *)c->next;
if(c->type == CLIENT_USER || c->type == CLIENT_SERVICE)
Destroy_UserOrService(c, txt, FwdMsg, SendQuit);
else if( c->type == CLIENT_SERVER )
{
if (c != This_Server) {
if (c->conn_id != NONE)
Log(LOG_NOTICE|LOG_snotice,
"Server \"%s\" unregistered (connection %d): %s.",
c->id, c->conn_id, txt);
else
Log(LOG_NOTICE|LOG_snotice,
"Server \"%s\" unregistered: %s.",
c->id, txt);
}
/* inform other servers */
if( ! NGIRCd_SignalQuit )
{
if( FwdMsg ) IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "SQUIT %s :%s", c->id, FwdMsg );
else IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "SQUIT %s :", c->id );
}
}
else
{
if (c->conn_id != NONE) {
if (c->id[0])
Log(LOG_NOTICE,
"Client \"%s\" unregistered (connection %d): %s.",
c->id, c->conn_id, txt);
else
Log(LOG_NOTICE,
"Client unregistered (connection %d): %s.",
c->conn_id, txt);
} else {
Log(LOG_WARNING,
"Unregistered unknown client \"%s\": %s",
c->id[0] ? c->id : "(No Nick)", txt);
}
}
Free_Client(&c);
break;
}
last = c;
c = (CLIENT *)c->next;
}
} /* Client_Destroy */
void Dht_DestroyClient(void *client)
{
Client_Destroy((Client *)client);
}
/**
* Handler for the IRC command "SQUIT".
* See RFC 2813 section 4.1.2 and RFC 2812 section 3.1.8.
*/
GLOBAL bool
IRC_SQUIT(CLIENT * Client, REQUEST * Req)
{
char msg[COMMAND_LEN], logmsg[COMMAND_LEN];
CLIENT *from, *target;
CONN_ID con;
int loglevel;
assert(Client != NULL);
assert(Req != NULL);
if (Client_Type(Client) != CLIENT_SERVER
&& !Client_HasMode(Client, 'o'))
return Op_NoPrivileges(Client, Req);
/* Bad number of arguments? */
if (Req->argc != 2)
return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
Client_ID(Client), Req->command);
if (Client_Type(Client) == CLIENT_SERVER && Req->prefix) {
from = Client_Search(Req->prefix);
if (Client_Type(from) != CLIENT_SERVER
&& !Op_Check(Client, Req))
return Op_NoPrivileges(Client, Req);
} else
from = Client;
if (!from)
return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
Client_ID(Client), Req->prefix);
if (Client_Type(Client) == CLIENT_USER)
loglevel = LOG_NOTICE | LOG_snotice;
else
loglevel = LOG_DEBUG;
Log(loglevel, "Got SQUIT from %s for \"%s\": \"%s\" ...",
Client_ID(from), Req->argv[0], Req->argv[1]);
target = Client_Search(Req->argv[0]);
if (Client_Type(Client) != CLIENT_SERVER &&
target == Client_ThisServer())
return Op_NoPrivileges(Client, Req);
if (!target) {
/* The server is (already) unknown */
Log(LOG_WARNING,
"Got SQUIT from %s for unknown server \"%s\"!?",
Client_ID(Client), Req->argv[0]);
return CONNECTED;
}
con = Client_Conn(target);
if (Req->argv[1][0])
if (Client_NextHop(from) != Client || con > NONE)
snprintf(msg, sizeof(msg), "%s (SQUIT from %s)",
Req->argv[1], Client_ID(from));
else
strlcpy(msg, Req->argv[1], sizeof(msg));
else
snprintf(msg, sizeof(msg), "Got SQUIT from %s",
Client_ID(from));
if (con > NONE) {
/* We are directly connected to the target server, so we
* have to tear down the connection and to inform all the
* other remaining servers in the network */
IRC_SendWallops(Client_ThisServer(), Client_ThisServer(),
"Received SQUIT %s from %s: %s",
Req->argv[0], Client_ID(from),
Req->argv[1][0] ? Req->argv[1] : "-");
Conn_Close(con, NULL, msg, true);
if (con == Client_Conn(Client))
return DISCONNECTED;
} else {
/* This server is not directly connected, so the SQUIT must
* be forwarded ... */
if (Client_Type(from) != CLIENT_SERVER) {
/* The origin is not an IRC server, so don't evaluate
* this SQUIT but simply forward it */
IRC_WriteStrClientPrefix(Client_NextHop(target),
from, "SQUIT %s :%s", Req->argv[0], Req->argv[1]);
} else {
/* SQUIT has been generated by another server, so
* remove the target server from the network! */
logmsg[0] = '\0';
if (!strchr(msg, '('))
snprintf(logmsg, sizeof(logmsg),
"%s (SQUIT from %s)", Req->argv[1],
Client_ID(from));
Client_Destroy(target, logmsg[0] ? logmsg : msg,
msg, false);
}
}
return CONNECTED;
} /* IRC_SQUIT */
void server_exec(Socket server, SockAddrIn server_addr, ClientSet* clients,
NoticeBoard* board)
{
int i;
if (listen(server, 5) == -1) {
error("Could not listen on socket");
exit(1);
}
while (running) {
usleep(100000);
/* -- Accepting connections -- */
socklen_t sz = sizeof(server_addr);
Socket new_socket = accept(server, (SockAddr*)&server_addr, &sz);
/* Error handling, most likely EAGAIN since we're using
* non blocking sockets.
*/
if (new_socket == -1) {
if (errno != EAGAIN) {
error("Could not accept connection");
}
} else {
int j = 0;
fcntl(new_socket, F_SETFL, O_NONBLOCK);
Client* c = ClientSet_Add(clients, new_socket);
if (c == NULL) continue;
memset(c->properties.nick, 0, NICK_MAXLEN);
strcpy(c->properties.nick, "user");
for (i = 0; i < clients->size; i++) {
if (&clients->clients[i] == c ||
clients->clients[i].state == DISCONNECTED) continue;
if (!strcmp(clients->clients[i].properties.nick,
c->properties.nick)) {
j++;
sprintf(c->properties.nick, "user(%d)", j);
i = 0;
}
}
SockAddr peer_address;
socklen_t addrlen = sizeof(peer_address);
int has_error = getpeername(new_socket, &peer_address,
&addrlen);
if (has_error == -1) {
error("Error getting peer name");
}
SockAddrIn *addr_in = (struct sockaddr_in *)&peer_address;
c->ip_string = ipaddr(*addr_in);
printf("Client connected (%s)\n", c->ip_string);
send_motd(c);
}
/* -- Reading data -- */
for (i = 0; i < clients->size; i++) {
if (clients->clients[i].state == DISCONNECTED) {
Client_Destroy(&clients->clients[i]);
continue;
}
client_exec(&(clients->clients[i]), i, clients, board);
}
}
}
void disconnect(Client* client)
{
printf("Client disconnected (%s)\n", client->ip_string);
Client_Destroy(client);
}
