ngircd-tor/src/ngircd/irc.c

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2001-12-14 09:13:43 +01:00
/*
* ngIRCd -- The Next Generation IRC Daemon
* Copyright (c)2001-2014 Alexander Barton (alex@barton.de) and Contributors.
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*
* 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.
* Please read the file COPYING, README and AUTHORS for more information.
*/
#include "portab.h"
/**
* @file
* IRC commands
*/
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <time.h>
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#include "ngircd.h"
#include "conn-func.h"
#include "conf.h"
#include "channel.h"
#ifdef ICONV
# include "conn-encoding.h"
#endif
#include "irc-macros.h"
#include "irc-write.h"
#include "log.h"
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#include "match.h"
#include "messages.h"
#include "parse.h"
#include "op.h"
#include "irc.h"
static char *Option_String PARAMS((CONN_ID Idx));
static bool Send_Message PARAMS((CLIENT *Client, REQUEST *Req, int ForceType,
bool SendErrors));
static bool Send_Message_Mask PARAMS((CLIENT *from, char *command,
char *targetMask, char *message,
bool SendErrors));
static bool Help PARAMS((CLIENT *Client, const char *Topic));
/**
* Check if a list limit is reached and inform client accordingly.
*
* @param From The client.
* @param Count Reply item count.
* @param Limit Reply limit.
* @param Name Name of the list.
* @return true if list limit has been reached; false otherwise.
*/
GLOBAL bool
IRC_CheckListTooBig(CLIENT *From, const int Count, const int Limit,
const char *Name)
{
assert(From != NULL);
assert(Count >= 0);
assert(Limit > 0);
assert(Name != NULL);
if (Count < Limit)
return false;
(void)IRC_WriteStrClient(From,
"NOTICE %s :%s list limit (%d) reached!",
Client_ID(From), Name, Limit);
IRC_SetPenalty(From, 2);
return true;
}
/**
* 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)
{
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)
Log(LOG_NOTICE, "Got ERROR from \"%s\"!",
Client_Mask(Client));
else
Log(LOG_NOTICE, "Got ERROR from \"%s\": \"%s\"!",
Client_Mask(Client), Req->argv[0]);
return CONNECTED;
} /* IRC_ERROR */
/**
* Handler for the IRC "KILL" command.
*
* This function implements the IRC command "KILL" which 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.
* @return CONNECTED or DISCONNECTED.
*/
GLOBAL bool
IRC_KILL(CLIENT *Client, REQUEST *Req)
{
CLIENT *prefix;
char reason[COMMAND_LEN];
assert (Client != NULL);
assert (Req != NULL);
if (Client_Type(Client) != CLIENT_SERVER && !Op_Check(Client, Req))
return Op_NoPrivileges(Client, Req);
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/* 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. And this is the reason why we don't
* use the _IRC_GET_SENDER_OR_RETURN_ macro above! */
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]);
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/* 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));
return IRC_KillClient(Client, prefix, Req->argv[0], reason);
}
/**
* Handler for the IRC "NOTICE" 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_NOTICE(CLIENT *Client, REQUEST *Req)
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{
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return Send_Message(Client, Req, CLIENT_USER, false);
} /* IRC_NOTICE */
/**
* Handler for the IRC "PRIVMSG" 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_PRIVMSG(CLIENT *Client, REQUEST *Req)
{
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return Send_Message(Client, Req, CLIENT_USER, true);
} /* IRC_PRIVMSG */
/**
* Handler for the IRC "SQUERY" 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_SQUERY(CLIENT *Client, REQUEST *Req)
{
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return Send_Message(Client, Req, CLIENT_SERVICE, true);
} /* IRC_SQUERY */
/*
* Handler for the IRC "TRACE" 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_TRACE(CLIENT *Client, REQUEST *Req)
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{
CLIENT *from, *target, *c;
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CONN_ID idx, idx2;
char user[CLIENT_USER_LEN];
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assert(Client != NULL);
assert(Req != NULL);
_IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
_IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, from)
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/* Forward command to other server? */
if (target != Client_ThisServer()) {
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/* Send RPL_TRACELINK back to initiator */
idx = Client_Conn(Client);
assert(idx > NONE);
idx2 = Client_Conn(Client_NextHop(target));
assert(idx2 > NONE);
if (!IRC_WriteStrClient(from, RPL_TRACELINK_MSG,
Client_ID(from), PACKAGE_NAME,
PACKAGE_VERSION, Client_ID(target),
Client_ID(Client_NextHop(target)),
Option_String(idx2),
time(NULL) - Conn_StartTime(idx2),
Conn_SendQ(idx), Conn_SendQ(idx2)))
return DISCONNECTED;
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/* Forward command */
IRC_WriteStrClientPrefix(target, from, "TRACE %s", Req->argv[0]);
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return CONNECTED;
}
/* Infos about all connected servers */
c = Client_First();
while (c) {
if (Client_Conn(c) > NONE) {
/* Local client */
if (Client_Type(c) == CLIENT_SERVER) {
/* Server link */
strlcpy(user, Client_User(c), sizeof(user));
if (user[0] == '~')
strlcpy(user, "unknown", sizeof(user));
if (!IRC_WriteStrClient(from,
RPL_TRACESERVER_MSG,
Client_ID(from), Client_ID(c),
user, Client_Hostname(c),
Client_Mask(Client_ThisServer()),
Option_String(Client_Conn(c))))
return DISCONNECTED;
}
if (Client_Type(c) == CLIENT_USER
&& Client_HasMode(c, 'o')) {
/* IRC Operator */
if (!IRC_WriteStrClient(from,
RPL_TRACEOPERATOR_MSG,
Client_ID(from), Client_ID(c)))
return DISCONNECTED;
}
}
c = Client_Next( c );
}
return IRC_WriteStrClient(from, RPL_TRACEEND_MSG, Client_ID(from),
Conf_ServerName, PACKAGE_NAME,
PACKAGE_VERSION, NGIRCd_DebugLevel);
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} /* IRC_TRACE */
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/**
* Handler for the IRC "HELP" 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
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IRC_HELP(CLIENT *Client, REQUEST *Req)
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{
COMMAND *cmd;
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assert(Client != NULL);
assert(Req != NULL);
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if ((Req->argc == 0 && array_bytes(&Conf_Helptext) > 0)
|| (Req->argc >= 1 && strcasecmp(Req->argv[0], "Commands") != 0)) {
/* Help text available and requested */
if (Req->argc >= 1)
return Help(Client, Req->argv[0]);
if (!Help(Client, "Intro"))
return DISCONNECTED;
return CONNECTED;
}
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cmd = Parse_GetCommandStruct();
while(cmd->name) {
if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
Client_ID(Client), cmd->name))
return DISCONNECTED;
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cmd++;
}
return CONNECTED;
} /* IRC_HELP */
/**
* 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;
}
/**
* Send help for a given topic to the client.
*
* @param Client The client requesting help.
* @param Topoc The help topic requested.
* @return CONNECTED or DISCONNECTED.
*/
static bool
Help(CLIENT *Client, const char *Topic)
{
char *line;
size_t helptext_len, len_str, idx_start, lines = 0;
bool in_article = false;
assert(Client != NULL);
assert(Topic != NULL);
helptext_len = array_bytes(&Conf_Helptext);
line = array_start(&Conf_Helptext);
while (helptext_len > 0) {
len_str = strlen(line) + 1;
assert(helptext_len >= len_str);
helptext_len -= len_str;
if (in_article) {
/* The first character in each article text line must
* be a TAB (ASCII 9) character which will be stripped
* in the output. If it is not a TAB, the end of the
* article has been reached. */
if (line[0] != '\t') {
if (lines > 0)
return CONNECTED;
else
break;
}
/* A single '.' character indicates an empty line */
if (line[1] == '.' && line[2] == '\0')
idx_start = 2;
else
idx_start = 1;
if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
Client_ID(Client),
&line[idx_start]))
return DISCONNECTED;
lines++;
} else {
if (line[0] == '-' && line[1] == ' '
&& strcasecmp(&line[2], Topic) == 0)
in_article = true;
}
line += len_str;
}
/* Help topic not found (or empty)! */
if (!IRC_WriteStrClient(Client, "NOTICE %s :No help for \"%s\" found!",
Client_ID(Client), Topic))
return DISCONNECTED;
return CONNECTED;
}
/**
* Get pointer to a static string representing the connection "options".
*
* @param Idx Connection index.
* @return Pointer to static (global) string buffer.
*/
static char *
#ifdef ZLIB
Option_String(CONN_ID Idx)
#else
Option_String(UNUSED CONN_ID Idx)
#endif
{
static char option_txt[8];
UINT16 options;
assert(Idx != NONE);
options = Conn_Options(Idx);
strcpy(option_txt, "F"); /* No idea what this means, but the
* original ircd sends it ... */
#ifdef SSL_SUPPORT
if(options & CONN_SSL) /* SSL encrypted link */
strlcat(option_txt, "s", sizeof(option_txt));
#endif
#ifdef ZLIB
if(options & CONN_ZIP) /* zlib compression enabled */
strlcat(option_txt, "z", sizeof(option_txt));
#endif
LogDebug(" *** %d: %d = %s", Idx, options, option_txt);
return option_txt;
} /* Option_String */
static bool
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Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
{
CLIENT *cl, *from;
CL2CHAN *cl2chan;
CHANNEL *chan;
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char *currentTarget = Req->argv[0];
char *lastCurrentTarget = NULL;
char *message = NULL;
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assert(Client != NULL);
assert(Req != NULL);
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if (Req->argc == 0) {
if (!SendErrors)
return CONNECTED;
return IRC_WriteErrClient(Client, ERR_NORECIPIENT_MSG,
Client_ID(Client), Req->command);
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}
if (Req->argc == 1) {
if (!SendErrors)
return CONNECTED;
return IRC_WriteErrClient(Client, ERR_NOTEXTTOSEND_MSG,
Client_ID(Client));
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}
if (Req->argc > 2) {
if (!SendErrors)
return CONNECTED;
return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
Client_ID(Client), Req->command);
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}
if (Client_Type(Client) == CLIENT_SERVER)
from = Client_Search(Req->prefix);
else
from = Client;
if (!from)
return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
Client_ID(Client), Req->prefix);
#ifdef ICONV
if (Client_Conn(Client) > NONE)
message = Conn_EncodingFrom(Client_Conn(Client), Req->argv[1]);
else
#endif
message = Req->argv[1];
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/* handle msgtarget = msgto *("," msgto) */
currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
ngt_UpperStr(Req->command);
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while (currentTarget) {
/* Check for and handle valid <msgto> of form:
* RFC 2812 2.3.1:
* msgto = channel / ( user [ "%" host ] "@" servername )
* msgto =/ ( user "%" host ) / targetmask
* msgto =/ nickname / ( nickname "!" user "@" host )
*/
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if (strchr(currentTarget, '!') == NULL)
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/* nickname */
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cl = Client_Search(currentTarget);
else
cl = NULL;
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if (cl == NULL) {
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/* If currentTarget isn't a nickname check for:
* user ["%" host] "@" servername
* user "%" host
* nickname "!" user "@" host
*/
char target[COMMAND_LEN];
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char * nick = NULL;
char * user = NULL;
char * host = NULL;
char * server = NULL;
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strlcpy(target, currentTarget, COMMAND_LEN);
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server = strchr(target, '@');
if (server) {
*server = '\0';
server++;
}
host = strchr(target, '%');
if (host) {
*host = '\0';
host++;
}
user = strchr(target, '!');
if (user) {
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/* msgto form: nick!user@host */
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*user = '\0';
user++;
nick = target;
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host = server; /* not "@server" but "@host" */
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} else {
user = target;
}
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for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
if (Client_Type(cl) != CLIENT_USER &&
Client_Type(cl) != CLIENT_SERVICE)
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continue;
if (nick != NULL && host != NULL) {
if (strcasecmp(nick, Client_ID(cl)) == 0 &&
strcasecmp(user, Client_User(cl)) == 0 &&
strcasecmp(host, Client_HostnameDisplayed(cl)) == 0)
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break;
else
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continue;
}
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if (strcasecmp(user, Client_User(cl)) != 0)
continue;
if (host != NULL && strcasecmp(host,
Client_HostnameDisplayed(cl)) != 0)
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continue;
if (server != NULL && strcasecmp(server,
Client_ID(Client_Introducer(cl))) != 0)
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continue;
break;
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}
}
if (cl) {
/* Target is a user, enforce type */
#ifndef STRICT_RFC
if (Client_Type(cl) != ForceType &&
!(ForceType == CLIENT_USER &&
(Client_Type(cl) == CLIENT_USER ||
Client_Type(cl) == CLIENT_SERVICE))) {
#else
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if (Client_Type(cl) != ForceType) {
#endif
if (SendErrors && !IRC_WriteErrClient(
from, ERR_NOSUCHNICK_MSG,Client_ID(from),
currentTarget))
return DISCONNECTED;
goto send_next_target;
}
#ifndef STRICT_RFC
if (ForceType == CLIENT_SERVICE &&
(Conn_Options(Client_Conn(Client_NextHop(cl)))
& CONN_RFC1459)) {
/* SQUERY command but RFC 1459 link: convert
* request to PRIVMSG command */
Req->command = "PRIVMSG";
}
#endif
if (Client_HasMode(cl, 'b') &&
!Client_HasMode(from, 'R') &&
!Client_HasMode(from, 'o') &&
!(Client_Type(from) == CLIENT_SERVER) &&
!(Client_Type(from) == CLIENT_SERVICE)) {
if (SendErrors && !IRC_WriteErrClient(from,
ERR_NONONREG_MSG,
Client_ID(from), Client_ID(cl)))
return DISCONNECTED;
goto send_next_target;
}
if (Client_HasMode(cl, 'C')) {
cl2chan = Channel_FirstChannelOf(cl);
while (cl2chan) {
chan = Channel_GetChannel(cl2chan);
if (Channel_IsMemberOf(chan, from))
break;
cl2chan = Channel_NextChannelOf(cl, cl2chan);
}
if (!cl2chan) {
if (SendErrors && !IRC_WriteErrClient(
from, ERR_NOTONSAMECHANNEL_MSG,
Client_ID(from), Client_ID(cl)))
return DISCONNECTED;
goto send_next_target;
}
}
if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
&& Client_HasMode(cl, 'a')) {
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/* Target is away */
if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
Client_ID(from),
Client_ID(cl),
Client_Away(cl)))
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return DISCONNECTED;
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}
if (Client_Conn(from) > NONE) {
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Conn_UpdateIdle(Client_Conn(from));
}
if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
Req->command, Client_ID(cl),
message))
return DISCONNECTED;
} else if (ForceType != CLIENT_SERVICE
&& (chan = Channel_Search(currentTarget))) {
if (!Channel_Write(chan, from, Client, Req->command,
SendErrors, message))
return DISCONNECTED;
} else if (ForceType != CLIENT_SERVICE
/* $#: server/target mask, RFC 2812, sec. 3.3.1 */
&& strchr("$#", currentTarget[0])
&& strchr(currentTarget, '.')) {
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/* targetmask */
if (!Send_Message_Mask(from, Req->command, currentTarget,
message, SendErrors))
return DISCONNECTED;
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} else {
if (!SendErrors)
return CONNECTED;
if (!IRC_WriteErrClient(from, ERR_NOSUCHNICK_MSG,
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Client_ID(from), currentTarget))
return DISCONNECTED;
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}
send_next_target:
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currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
if (currentTarget)
Conn_SetPenalty(Client_Conn(Client), 1);
}
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return CONNECTED;
} /* Send_Message */
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static bool
Send_Message_Mask(CLIENT * from, char * command, char * targetMask,
char * message, bool SendErrors)
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{
CLIENT *cl;
bool client_match;
char *mask = targetMask + 1;
const char *check_wildcards;
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cl = NULL;
if (!Client_HasMode(from, 'o')) {
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if (!SendErrors)
return true;
return IRC_WriteErrClient(from, ERR_NOPRIVILEGES_MSG,
Client_ID(from));
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}
/*
* RFC 2812, sec. 3.3.1 requires that targetMask have at least one
* dot (".") and no wildcards ("*", "?") following the last one.
*/
check_wildcards = strrchr(targetMask, '.');
assert(check_wildcards != NULL);
if (check_wildcards &&
check_wildcards[strcspn(check_wildcards, "*?")])
{
if (!SendErrors)
return true;
return IRC_WriteErrClient(from, ERR_WILDTOPLEVEL, targetMask);
}
/* #: hostmask, see RFC 2812, sec. 3.3.1 */
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if (targetMask[0] == '#') {
for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
if (Client_Type(cl) != CLIENT_USER)
continue;
client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
if (client_match)
if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
command, Client_ID(cl), message))
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return false;
}
} else {
assert(targetMask[0] == '$'); /* $: server mask, see RFC 2812, sec. 3.3.1 */
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for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
if (Client_Type(cl) != CLIENT_USER)
continue;
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client_match = MatchCaseInsensitive(mask,
Client_ID(Client_Introducer(cl)));
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if (client_match)
if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
command, Client_ID(cl), message))
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return false;
}
}
return CONNECTED;
} /* Send_Message_Mask */
2001-12-14 09:13:43 +01:00
/* -eof- */