[solanum.git] / ircd / parse.c

/*
 *  charybdis: an advanced ircd.
 *  parse.c: The message parser.
 *
 *  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
 *  Copyright (C) 2007-2016 William Pitcock
 *
 *  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 "parse.h"
#include "client.h"
#include "channel.h"
#include "common.h"
#include "hash.h"
#include "match.h"
#include "ircd.h"
#include "numeric.h"
#include "logger.h"
#include "s_stats.h"
#include "send.h"
#include "msg.h"
#include "msgbuf.h"
#include "s_conf.h"
#include "s_serv.h"
#include "packet.h"
#include "s_assert.h"

struct Dictionary *cmd_dict = NULL;
struct Dictionary *alias_dict = NULL;

/* parv[0] is not used, and parv[LAST] == NULL */
static char *para[MAXPARA + 2];

static void cancel_clients(struct Client *, struct Client *);
static void remove_unknown(struct Client *, const char *, char *);

static void do_numeric(int, struct Client *, struct Client *, int, const char **);
static void do_alias(struct alias_entry *, struct Client *, char *);

static int handle_command(struct Message *, struct MsgBuf *, struct Client *, struct Client *);

static char buffer[1024];

/* turn a string into a parc/parv pair */

char *reconstruct_parv(int parc, const char *parv[])
{
	static char tmpbuf[BUFSIZE]; int i;

	rb_strlcpy(tmpbuf, parv[0], BUFSIZE);
	for (i = 1; i < parc; i++)
	{
		rb_strlcat(tmpbuf, " ", BUFSIZE);
		rb_strlcat(tmpbuf, parv[i], BUFSIZE);
	}
	return tmpbuf;
}

/* parse()
 *
 * given a raw buffer, parses it and generates parv and parc
 */
void
parse(struct Client *client_p, char *pbuffer, char *bufend)
{
	struct Client *from = client_p;
	char *end;
	int i = 1, res;
	int numeric = 0;
	struct Message *mptr;
	struct MsgBuf msgbuf;

	s_assert(MyConnect(client_p));
	s_assert(client_p->localClient->F != NULL);
	if(IsAnyDead(client_p))
		return;

	end = bufend - 1;

	/* XXX this should be done before parse() is called */
	if(*end == '\n')
		*end-- = '\0';
	if(*end == '\r')
		*end = '\0';

	res = msgbuf_parse(&msgbuf, pbuffer);
	if (res)
	{
		ServerStats.is_empt++;
		return;
	}

	if (msgbuf.origin != NULL)
	{
		from = find_client(msgbuf.origin);

		/* didnt find any matching client, issue a kill */
		if(from == NULL)
		{
			ServerStats.is_unpf++;
			remove_unknown(client_p, msgbuf.origin, pbuffer);
			return;
		}

		/* fake direction, hmm. */
		if(from->from != client_p)
		{
			ServerStats.is_wrdi++;
			cancel_clients(client_p, from);
			return;
		}
	}

	if(IsDigit(*msgbuf.cmd) && IsDigit(*(msgbuf.cmd + 1)) && IsDigit(*(msgbuf.cmd + 2)))
	{
		mptr = NULL;
		numeric = atoi(msgbuf.cmd);
		ServerStats.is_num++;
	}
	else
	{
		mptr = rb_dictionary_retrieve(cmd_dict, msgbuf.cmd);

		/* no command or its encap only, error */
		if(!mptr || !mptr->cmd)
		{
			if (IsPerson(client_p))
			{
				struct alias_entry *aptr = rb_dictionary_retrieve(alias_dict, msgbuf.cmd);
				if (aptr != NULL)
				{
					if (msgbuf.n_para < 2)
					{
						sendto_one(client_p, form_str(ERR_NEEDMOREPARAMS),
							   me.name,
							   EmptyString(client_p->name) ? "*" : client_p->name,
							   msgbuf.cmd);
						return;
					}

					do_alias(aptr, client_p, reconstruct_parv(msgbuf.n_para - 1, msgbuf.para + 1));
					return;
				}
			}
			if(IsPerson(from))
			{
				sendto_one(from, form_str(ERR_UNKNOWNCOMMAND),
					   me.name, from->name, msgbuf.cmd);
			}
			ServerStats.is_unco++;
			return;
		}

		mptr->bytes += msgbuf.parselen;
	}

	if(mptr == NULL)
	{
		do_numeric(numeric, client_p, from, msgbuf.n_para, msgbuf.para);
		return;
	}

	if(handle_command(mptr, &msgbuf, client_p, from) < -1)
	{
		char *p;
		for (p = pbuffer; p <= end; p += 8)
		{
			/* HACK HACK */
			/* Its expected this nasty code can be removed
			 * or rewritten later if still needed.
			 */
			if((p + 8) > end)
			{
				for (; p <= end; p++)
				{
					ilog(L_MAIN, "%02x |%c", p[0], p[0]);
				}
			}
			else
				ilog(L_MAIN,
				     "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
				     p[0], p[1], p[2], p[3], p[4], p[5],
				     p[6], p[7], p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
		}
	}

}

/*
 * handle_command
 *
 * inputs	- pointer to message block
 * 		- pointer to message buffer
 *		- pointer to client
 *		- pointer to client message is from
 * output	- -1 if error from server
 * side effects	-
 */
static int
handle_command(struct Message *mptr, struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *from)
{
	struct MessageEntry ehandler;
	MessageHandler handler = 0;
	char squitreason[80];

	if(IsAnyDead(client_p))
		return -1;

	if(IsServer(client_p))
		mptr->rcount++;

	mptr->count++;

	ehandler = mptr->handlers[from->handler];
	handler = ehandler.handler;

	/* check right amount of params is passed... --is */
	if(msgbuf_p->n_para < ehandler.min_para ||
	   (ehandler.min_para && EmptyString(msgbuf_p->para[ehandler.min_para - 1])))
	{
		if(!IsServer(client_p))
		{
			sendto_one(client_p, form_str(ERR_NEEDMOREPARAMS),
				   me.name,
				   EmptyString(client_p->name) ? "*" : client_p->name,
				   mptr->cmd);
			if(MyClient(client_p))
				return (1);
			else
				return (-1);
		}

		sendto_realops_snomask(SNO_GENERAL, L_ALL,
				     "Dropping server %s due to (invalid) command '%s'"
				     " with only %zu arguments (expecting %d).",
				     client_p->name, mptr->cmd, msgbuf_p->n_para, ehandler.min_para);
		ilog(L_SERVER,
		     "Insufficient parameters (%zu < %d) for command '%s' from %s.",
		     msgbuf_p->n_para, ehandler.min_para, mptr->cmd, client_p->name);
		snprintf(squitreason, sizeof squitreason,
				"Insufficient parameters (%zu < %d) for command '%s'",
				msgbuf_p->n_para, ehandler.min_para, mptr->cmd);
		exit_client(client_p, client_p, client_p, squitreason);
		return (-1);
	}

	(*handler) (msgbuf_p, client_p, from, msgbuf_p->n_para, msgbuf_p->para);
	return (1);
}

void
handle_encap(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p,
	     const char *command, int parc, const char *parv[])
{
	struct Message *mptr;
	struct MessageEntry ehandler;
	MessageHandler handler = 0;

	mptr = rb_dictionary_retrieve(cmd_dict, command);

	if(mptr == NULL || mptr->cmd == NULL)
		return;

	ehandler = mptr->handlers[ENCAP_HANDLER];
	handler = ehandler.handler;

	if(parc < ehandler.min_para ||
	   (ehandler.min_para && EmptyString(parv[ehandler.min_para - 1])))
		return;

	(*handler) (msgbuf_p, client_p, source_p, parc, parv);
}

/*
 * clear_hash_parse()
 *
 * inputs       -
 * output       - NONE
 * side effects - MUST MUST be called at startup ONCE before
 *                any other keyword hash routine is used.
 */
void
clear_hash_parse()
{
	cmd_dict = rb_dictionary_create("command", strcasecmp);
}

/* mod_add_cmd
 *
 * inputs	- command name
 *		- pointer to struct Message
 * output	- none
 * side effects - load this one command name
 *		  msg->count msg->bytes is modified in place, in
 *		  modules address space. Might not want to do that...
 */
void
mod_add_cmd(struct Message *msg)
{
	s_assert(msg != NULL);
	if(msg == NULL)
		return;

	if (rb_dictionary_find(cmd_dict, msg->cmd) != NULL)
		return;

	msg->count = 0;
	msg->rcount = 0;
	msg->bytes = 0;

	rb_dictionary_add(cmd_dict, msg->cmd, msg);
}

/* mod_del_cmd
 *
 * inputs	- command name
 * output	- none
 * side effects - unload this one command name
 */
void
mod_del_cmd(struct Message *msg)
{
	s_assert(msg != NULL);
	if(msg == NULL)
		return;

	rb_dictionary_delete(cmd_dict, msg->cmd);
}

/* cancel_clients()
 *
 * inputs	- client who sent us the message, client with fake
 *		  direction
 * outputs	- a given warning about the fake direction
 * side effects -
 */
static void
cancel_clients(struct Client *client_p, struct Client *source_p)
{
	/* ok, fake prefix happens naturally during a burst on a nick
	 * collision with TS5, we cant kill them because one client has to
	 * survive, so we just send an error.
	 */
	if(IsServer(source_p) || IsMe(source_p))
	{
		sendto_realops_snomask(SNO_DEBUG, L_ALL,
				     "Message for %s[%s] from %s",
				     source_p->name, source_p->from->name,
				     client_p->name);
	}
	else
	{
		sendto_realops_snomask(SNO_DEBUG, L_ALL,
				     "Message for %s[%s@%s!%s] from %s (TS, ignored)",
				     source_p->name,
				     source_p->username,
				     source_p->host,
				     source_p->from->name,
				     client_p->name);
	}
}

/* remove_unknown()
 *
 * inputs	- client who gave us message, supposed sender, buffer
 * output	-
 * side effects	- kills issued for clients, squits for servers
 */
static void
remove_unknown(struct Client *client_p, const char *lsender, char *lbuffer)
{
	int slen = strlen(lsender);
	char sid[4];
	struct Client *server;

	/* meepfoo	is a nickname (ignore)
	 * #XXXXXXXX	is a UID (KILL)
	 * #XX		is a SID (SQUIT)
	 * meep.foo	is a server (SQUIT)
	 */
	if((IsDigit(lsender[0]) && slen == 3) ||
	   (strchr(lsender, '.') != NULL))
	{
		sendto_realops_snomask(SNO_DEBUG, L_ALL,
				     "Unknown prefix (%s) from %s, Squitting %s",
				     lbuffer, client_p->name, lsender);

		sendto_one(client_p,
			   ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
			   get_id(&me, client_p), lsender,
			   lbuffer, client_p->name);
	}
	else if(!IsDigit(lsender[0]))
		;
	else if(slen != 9)
		sendto_realops_snomask(SNO_DEBUG, L_ALL,
				     "Invalid prefix (%s) from %s",
				     lbuffer, client_p->name);
	else
	{
		memcpy(sid, lsender, 3);
		sid[3] = '\0';
		server = find_server(NULL, sid);
		if (server != NULL && server->from == client_p)
			sendto_one(client_p, ":%s KILL %s :%s (Unknown Client)",
					get_id(&me, client_p), lsender, me.name);
	}
}


/*
 *
 *      parc    number of arguments ('sender' counted as one!)
 *      parv[1]..parv[parc-1]
 *              pointers to additional parameters, this is a NULL
 *              terminated list (parv[parc] == NULL).
 *
 * *WARNING*
 *      Numerics are mostly error reports. If there is something
 *      wrong with the message, just *DROP* it! Don't even think of
 *      sending back a neat error message -- big danger of creating
 *      a ping pong error message...
 */
static void
do_numeric(int numeric, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
	struct Client *target_p;
	struct Channel *chptr;

	if(parc < 2 || !IsServer(source_p))
		return;

	/* Remap low number numerics. */
	if(numeric < 100)
		numeric += 100;

	/*
	 * Prepare the parameter portion of the message into 'buffer'.
	 * (Because the buffer is twice as large as the message buffer
	 * for the socket, no overflow can occur here... ...on current
	 * assumptions--bets are off, if these are changed --msa)
	 * Note: if buffer is non-empty, it will begin with SPACE.
	 */
	if(parc > 1)
	{
		char *t = buffer;	/* Current position within the buffer */
		int i;
		int tl;		/* current length of presently being built string in t */
		for (i = 2; i < (parc - 1); i++)
		{
			tl = sprintf(t, " %s", parv[i]);
			t += tl;
		}
		sprintf(t, " :%s", parv[parc - 1]);
	}

	if((target_p = find_client(parv[1])) != NULL)
	{
		if(IsMe(target_p))
		{
			/*
			 * We shouldn't get numerics sent to us,
			 * any numerics we do get indicate a bug somewhere..
			 */
			/* ugh.  this is here because of nick collisions.  when two servers
			 * relink, they burst each other their nicks, then perform collides.
			 * if there is a nick collision, BOTH servers will kill their own
			 * nicks, and BOTH will kill the other servers nick, which wont exist,
			 * because it will have been already killed by the local server.
			 *
			 * unfortunately, as we cant guarantee other servers will do the
			 * "right thing" on a nick collision, we have to keep both kills.
			 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
			 */
			/* quick comment. This _was_ tried. i.e. assume the other servers
			 * will do the "right thing" and kill a nick that is colliding.
			 * unfortunately, it did not work. --Dianora
			 */
			/* note, now we send PING on server connect, we can
			 * also get ERR_NOSUCHSERVER..
			 */
			if(numeric != ERR_NOSUCHNICK &&
			   numeric != ERR_NOSUCHSERVER)
				sendto_realops_snomask(SNO_GENERAL, L_ADMIN,
						     "*** %s(via %s) sent a %03d numeric to me: %s",
						     source_p->name,
						     client_p->name, numeric, buffer);
			return;
		}
		else if(target_p->from == client_p)
		{
			/* This message changed direction (nick collision?)
			 * ignore it.
			 */
			return;
		}

		/* csircd will send out unknown umode flag for +a (admin), drop it here. */
		if(numeric == ERR_UMODEUNKNOWNFLAG && MyClient(target_p))
			return;

		/* Fake it for server hiding, if its our client */
		sendto_one(target_p, ":%s %03d %s%s",
			   get_id(source_p, target_p), numeric,
			   get_id(target_p, target_p), buffer);
		return;
	}
	else if((chptr = find_channel(parv[1])) != NULL)
		sendto_channel_flags(client_p, ALL_MEMBERS, source_p, chptr,
				     "%03d %s%s",
				     numeric, chptr->chname, buffer);
}

static void do_alias(struct alias_entry *aptr, struct Client *source_p, char *text)
{
	char *p;
	struct Client *target_p;

	if (!IsFloodDone(source_p) && source_p->localClient->receiveM > 20)
		flood_endgrace(source_p);

	p = strchr(aptr->target, '@');
	if (p != NULL)
	{
		/* user@server */
		target_p = find_server(NULL, p + 1);
		if (target_p != NULL && IsMe(target_p))
			target_p = NULL;
	}
	else
	{
		/* nick, must be +S */
		target_p = find_named_person(aptr->target);
		if (target_p != NULL && !IsService(target_p))
			target_p = NULL;
	}

	if (target_p == NULL)
	{
		sendto_one_numeric(source_p, ERR_SERVICESDOWN, form_str(ERR_SERVICESDOWN), aptr->target);
		return;
	}

	if (text != NULL && *text == ':')
		text++;
	if (text == NULL || *text == '\0')
	{
		sendto_one(source_p, form_str(ERR_NOTEXTTOSEND), me.name, source_p->name);
		return;
	}

	/* increment the hitcounter on this alias */
	aptr->hits++;

	sendto_one(target_p, ":%s PRIVMSG %s :%s",
			get_id(source_p, target_p),
			p != NULL ? aptr->target : get_id(target_p, target_p),
			text);
}

void
m_not_oper(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
	sendto_one_numeric(source_p, ERR_NOPRIVILEGES, form_str(ERR_NOPRIVILEGES));
}

void
m_unregistered(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
	/* bit of a hack.
	 * I don't =really= want to waste a bit in a flag
	 * number_of_nick_changes is only really valid after the client
	 * is fully registered..
	 */
	if(client_p->localClient->number_of_nick_changes == 0)
	{
		sendto_one(client_p, form_str(ERR_NOTREGISTERED), me.name);
		client_p->localClient->number_of_nick_changes++;
	}
}

void
m_registered(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
	sendto_one(client_p, form_str(ERR_ALREADYREGISTRED), me.name, source_p->name);
}

void
m_ignore(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
	/* Does nothing */
}
Commit	Line	Data
212380e3	1	/*
8ac75529	2	* charybdis: an advanced ircd.
212380e3 AC	3	* parse.c: The message parser.
	4	*
	5	* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
	6	* Copyright (C) 1996-2002 Hybrid Development Team
	7	* Copyright (C) 2002-2005 ircd-ratbox development team
4d03595d	8	* Copyright (C) 2007-2016 William Pitcock
212380e3 AC	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
	23	* USA
212380e3 AC	24	*/
	25
	26	#include "stdinc.h"
	27	#include "parse.h"
	28	#include "client.h"
	29	#include "channel.h"
	30	#include "common.h"
	31	#include "hash.h"
4562c604	32	#include "match.h"
212380e3 AC	33	#include "ircd.h"
212380e3 AC	34	#include "numeric.h"
4016731b	35	#include "logger.h"
212380e3 AC	36	#include "s_stats.h"
	37	#include "send.h"
	38	#include "msg.h"
4d03595d	39	#include "msgbuf.h"
212380e3	40	#include "s_conf.h"
212380e3 AC	41	#include "s_serv.h"
212380e3 AC	42	#include "packet.h"
77d3d2db	43	#include "s_assert.h"
212380e3	44
7416e480	45	struct Dictionary *cmd_dict = NULL;
8ac75529 AC	46	struct Dictionary *alias_dict = NULL;
8ac75529 AC	47
161f0409	48	/* parv[0] is not used, and parv[LAST] == NULL */
212380e3 AC	49	static char *para[MAXPARA + 2];
212380e3 AC	50
29c92cf9	51	static void cancel_clients(struct Client , struct Client );
1579e155	52	static void remove_unknown(struct Client , const char , char *);
212380e3	53
4d03595d	54	static void do_numeric(int, struct Client , struct Client , int, const char **);
212380e3 AC	55	static void do_alias(struct alias_entry , struct Client , char *);
212380e3 AC	56
4a84a763	57	static int handle_command(struct Message , struct MsgBuf , struct Client , struct Client );
212380e3	58
212380e3 AC	59	static char buffer[1024];
212380e3 AC	60
212380e3 AC	61	/* turn a string into a parc/parv pair */
212380e3 AC	62
e4603e3d AC	63	char reconstruct_parv(int parc, const char parv[])
	64	{
	65	static char tmpbuf[BUFSIZE]; int i;
	66
	67	rb_strlcpy(tmpbuf, parv[0], BUFSIZE);
	68	for (i = 1; i < parc; i++)
	69	{
	70	rb_strlcat(tmpbuf, " ", BUFSIZE);
	71	rb_strlcat(tmpbuf, parv[i], BUFSIZE);
	72	}
	73	return tmpbuf;
	74	}
212380e3	75
212380e3 AC	76	/* parse()
212380e3 AC	77	*
819dd2d2	78	* given a raw buffer, parses it and generates parv and parc
212380e3 AC	79	*/
	80	void
	81	parse(struct Client client_p, char pbuffer, char *bufend)
	82	{
	83	struct Client *from = client_p;
212380e3	84	char *end;
4d03595d AC	85	int i = 1, res;
4d03595d AC	86	int numeric = 0;
212380e3	87	struct Message *mptr;
4d03595d	88	struct MsgBuf msgbuf;
212380e3 AC	89
212380e3 AC	90	s_assert(MyConnect(client_p));
8c23bb2e	91	s_assert(client_p->localClient->F != NULL);
212380e3 AC	92	if(IsAnyDead(client_p))
	93	return;
	94
4d03595d	95	end = bufend - 1;
212380e3	96
4d03595d AC	97	/* XXX this should be done before parse() is called */
	98	if(*end == '\n')
	99	*end-- = '\0';
	100	if(*end == '\r')
	101	*end = '\0';
212380e3	102
4d03595d AC	103	res = msgbuf_parse(&msgbuf, pbuffer);
4d03595d AC	104	if (res)
212380e3	105	{
4d03595d AC	106	ServerStats.is_empt++;
	107	return;
	108	}
212380e3	109
4d03595d AC	110	if (msgbuf.origin != NULL)
	111	{
	112	from = find_client(msgbuf.origin);
212380e3	113
4d03595d AC	114	/* didnt find any matching client, issue a kill */
4d03595d AC	115	if(from == NULL)
212380e3	116	{
4d03595d	117	ServerStats.is_unpf++;
1579e155	118	remove_unknown(client_p, msgbuf.origin, pbuffer);
4d03595d	119	return;
212380e3 AC	120	}
212380e3 AC	121
4d03595d AC	122	/* fake direction, hmm. */
4d03595d AC	123	if(from->from != client_p)
212380e3	124	{
4d03595d AC	125	ServerStats.is_wrdi++;
	126	cancel_clients(client_p, from);
	127	return;
212380e3	128	}
212380e3 AC	129	}
212380e3 AC	130
4d03595d	131	if(IsDigit(msgbuf.cmd) && IsDigit((msgbuf.cmd + 1)) && IsDigit(*(msgbuf.cmd + 2)))
212380e3 AC	132	{
212380e3 AC	133	mptr = NULL;
4d03595d	134	numeric = atoi(msgbuf.cmd);
47adde3d	135	ServerStats.is_num++;
212380e3 AC	136	}
	137	else
	138	{
a4bf26dd	139	mptr = rb_dictionary_retrieve(cmd_dict, msgbuf.cmd);
212380e3 AC	140
	141	/* no command or its encap only, error */
	142	if(!mptr \|\| !mptr->cmd)
	143	{
4d03595d	144	if (IsPerson(client_p))
212380e3	145	{
a4bf26dd	146	struct alias_entry *aptr = rb_dictionary_retrieve(alias_dict, msgbuf.cmd);
4d03595d	147	if (aptr != NULL)
212380e3	148	{
1ca8cd52 AC	149	if (msgbuf.n_para < 2)
	150	{
	151	sendto_one(client_p, form_str(ERR_NEEDMOREPARAMS),
	152	me.name,
	153	EmptyString(client_p->name) ? "*" : client_p->name,
	154	msgbuf.cmd);
	155	return;
	156	}
	157
20dd3725	158	do_alias(aptr, client_p, reconstruct_parv(msgbuf.n_para - 1, msgbuf.para + 1));
4d03595d	159	return;
212380e3 AC	160	}
212380e3 AC	161	}
4d03595d AC	162	if(IsPerson(from))
	163	{
	164	sendto_one(from, form_str(ERR_UNKNOWNCOMMAND),
1579e155	165	me.name, from->name, msgbuf.cmd);
4d03595d	166	}
47adde3d	167	ServerStats.is_unco++;
212380e3 AC	168	return;
	169	}
	170
4d03595d	171	mptr->bytes += msgbuf.parselen;
212380e3 AC	172	}
212380e3 AC	173
212380e3 AC	174	if(mptr == NULL)
212380e3 AC	175	{
4d03595d	176	do_numeric(numeric, client_p, from, msgbuf.n_para, msgbuf.para);
212380e3 AC	177	return;
	178	}
	179
4a84a763	180	if(handle_command(mptr, &msgbuf, client_p, from) < -1)
212380e3 AC	181	{
	182	char *p;
	183	for (p = pbuffer; p <= end; p += 8)
	184	{
	185	/* HACK HACK */
	186	/* Its expected this nasty code can be removed
	187	* or rewritten later if still needed.
	188	*/
44f442e3	189	if((p + 8) > end)
212380e3 AC	190	{
	191	for (; p <= end; p++)
	192	{
	193	ilog(L_MAIN, "%02x \|%c", p[0], p[0]);
	194	}
	195	}
	196	else
	197	ilog(L_MAIN,
	198	"%02x %02x %02x %02x %02x %02x %02x %02x \|%c%c%c%c%c%c%c%c",
	199	p[0], p[1], p[2], p[3], p[4], p[5],
	200	p[6], p[7], p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
	201	}
	202	}
	203
	204	}
	205
	206	/*
	207	* handle_command
	208	*
	209	* inputs - pointer to message block
4a84a763	210	* - pointer to message buffer
212380e3 AC	211	* - pointer to client
212380e3 AC	212	* - pointer to client message is from
212380e3 AC	213	* output - -1 if error from server
	214	* side effects -
	215	*/
	216	static int
4a84a763	217	handle_command(struct Message mptr, struct MsgBuf msgbuf_p, struct Client client_p, struct Client from)
212380e3 AC	218	{
	219	struct MessageEntry ehandler;
	220	MessageHandler handler = 0;
	221	char squitreason[80];
	222
	223	if(IsAnyDead(client_p))
	224	return -1;
	225
	226	if(IsServer(client_p))
	227	mptr->rcount++;
	228
	229	mptr->count++;
	230
212380e3 AC	231	ehandler = mptr->handlers[from->handler];
	232	handler = ehandler.handler;
	233
	234	/* check right amount of params is passed... --is */
4a84a763 AC	235	if(msgbuf_p->n_para < ehandler.min_para \|\|
4a84a763 AC	236	(ehandler.min_para && EmptyString(msgbuf_p->para[ehandler.min_para - 1])))
212380e3 AC	237	{
	238	if(!IsServer(client_p))
	239	{
	240	sendto_one(client_p, form_str(ERR_NEEDMOREPARAMS),
55abcbb2 KB	241	me.name,
55abcbb2 KB	242	EmptyString(client_p->name) ? "*" : client_p->name,
212380e3 AC	243	mptr->cmd);
	244	if(MyClient(client_p))
	245	return (1);
	246	else
	247	return (-1);
	248	}
	249
	250	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	251	"Dropping server %s due to (invalid) command '%s'"
4a84a763 AC	252	" with only %zu arguments (expecting %d).",
4a84a763 AC	253	client_p->name, mptr->cmd, msgbuf_p->n_para, ehandler.min_para);
212380e3	254	ilog(L_SERVER,
4a84a763 AC	255	"Insufficient parameters (%zu < %d) for command '%s' from %s.",
4a84a763 AC	256	msgbuf_p->n_para, ehandler.min_para, mptr->cmd, client_p->name);
5203cba5	257	snprintf(squitreason, sizeof squitreason,
4a84a763 AC	258	"Insufficient parameters (%zu < %d) for command '%s'",
4a84a763 AC	259	msgbuf_p->n_para, ehandler.min_para, mptr->cmd);
212380e3 AC	260	exit_client(client_p, client_p, client_p, squitreason);
	261	return (-1);
	262	}
	263
4a84a763	264	(*handler) (msgbuf_p, client_p, from, msgbuf_p->n_para, msgbuf_p->para);
212380e3 AC	265	return (1);
	266	}
	267
	268	void
4a84a763	269	handle_encap(struct MsgBuf msgbuf_p, struct Client client_p, struct Client *source_p,
212380e3 AC	270	const char command, int parc, const char parv[])
	271	{
	272	struct Message *mptr;
	273	struct MessageEntry ehandler;
	274	MessageHandler handler = 0;
	275
a4bf26dd	276	mptr = rb_dictionary_retrieve(cmd_dict, command);
212380e3 AC	277
	278	if(mptr == NULL \|\| mptr->cmd == NULL)
	279	return;
	280
	281	ehandler = mptr->handlers[ENCAP_HANDLER];
	282	handler = ehandler.handler;
	283
55abcbb2	284	if(parc < ehandler.min_para \|\|
212380e3 AC	285	(ehandler.min_para && EmptyString(parv[ehandler.min_para - 1])))
	286	return;
	287
4a84a763	288	(*handler) (msgbuf_p, client_p, source_p, parc, parv);
212380e3 AC	289	}
	290
	291	/*
	292	* clear_hash_parse()
	293	*
	294	* inputs -
	295	* output - NONE
	296	* side effects - MUST MUST be called at startup ONCE before
	297	* any other keyword hash routine is used.
212380e3 AC	298	*/
	299	void
	300	clear_hash_parse()
	301	{
a4bf26dd	302	cmd_dict = rb_dictionary_create("command", strcasecmp);
212380e3 AC	303	}
	304
	305	/* mod_add_cmd
	306	*
	307	* inputs - command name
	308	* - pointer to struct Message
	309	* output - none
	310	* side effects - load this one command name
	311	* msg->count msg->bytes is modified in place, in
	312	* modules address space. Might not want to do that...
	313	*/
	314	void
	315	mod_add_cmd(struct Message *msg)
	316	{
212380e3 AC	317	s_assert(msg != NULL);
	318	if(msg == NULL)
	319	return;
	320
a4bf26dd	321	if (rb_dictionary_find(cmd_dict, msg->cmd) != NULL)
8ac75529	322	return;
212380e3 AC	323
	324	msg->count = 0;
	325	msg->rcount = 0;
	326	msg->bytes = 0;
	327
a4bf26dd	328	rb_dictionary_add(cmd_dict, msg->cmd, msg);
212380e3 AC	329	}
	330
	331	/* mod_del_cmd
	332	*
	333	* inputs - command name
	334	* output - none
	335	* side effects - unload this one command name
	336	*/
	337	void
	338	mod_del_cmd(struct Message *msg)
	339	{
212380e3 AC	340	s_assert(msg != NULL);
	341	if(msg == NULL)
	342	return;
	343
a4bf26dd	344	rb_dictionary_delete(cmd_dict, msg->cmd);
212380e3 AC	345	}
212380e3 AC	346
212380e3 AC	347	/* cancel_clients()
	348	*
	349	* inputs - client who sent us the message, client with fake
29c92cf9	350	* direction
212380e3 AC	351	* outputs - a given warning about the fake direction
	352	* side effects -
	353	*/
	354	static void
29c92cf9	355	cancel_clients(struct Client client_p, struct Client source_p)
212380e3 AC	356	{
	357	/* ok, fake prefix happens naturally during a burst on a nick
	358	* collision with TS5, we cant kill them because one client has to
	359	* survive, so we just send an error.
	360	*/
	361	if(IsServer(source_p) \|\| IsMe(source_p))
	362	{
	363	sendto_realops_snomask(SNO_DEBUG, L_ALL,
	364	"Message for %s[%s] from %s",
	365	source_p->name, source_p->from->name,
b3ebc7ab	366	client_p->name);
212380e3 AC	367	}
	368	else
	369	{
	370	sendto_realops_snomask(SNO_DEBUG, L_ALL,
	371	"Message for %s[%s@%s!%s] from %s (TS, ignored)",
	372	source_p->name,
	373	source_p->username,
	374	source_p->host,
	375	source_p->from->name,
b3ebc7ab	376	client_p->name);
212380e3 AC	377	}
	378	}
	379
	380	/* remove_unknown()
	381	*
	382	* inputs - client who gave us message, supposed sender, buffer
55abcbb2	383	* output -
212380e3 AC	384	* side effects - kills issued for clients, squits for servers
	385	*/
	386	static void
1579e155	387	remove_unknown(struct Client client_p, const char lsender, char *lbuffer)
212380e3 AC	388	{
212380e3 AC	389	int slen = strlen(lsender);
d45f5ea2 JT	390	char sid[4];
d45f5ea2 JT	391	struct Client *server;
212380e3	392
ba0711fd	393	/* meepfoo is a nickname (ignore)
212380e3 AC	394	* #XXXXXXXX is a UID (KILL)
	395	* #XX is a SID (SQUIT)
	396	* meep.foo is a server (SQUIT)
	397	*/
55abcbb2	398	if((IsDigit(lsender[0]) && slen == 3) \|\|
212380e3 AC	399	(strchr(lsender, '.') != NULL))
	400	{
	401	sendto_realops_snomask(SNO_DEBUG, L_ALL,
	402	"Unknown prefix (%s) from %s, Squitting %s",
b3ebc7ab	403	lbuffer, client_p->name, lsender);
212380e3 AC	404
	405	sendto_one(client_p,
	406	":%s SQUIT %s :(Unknown prefix (%s) from %s)",
55abcbb2	407	get_id(&me, client_p), lsender,
212380e3 AC	408	lbuffer, client_p->name);
212380e3 AC	409	}
d45f5ea2 JT	410	else if(!IsDigit(lsender[0]))
	411	;
	412	else if(slen != 9)
	413	sendto_realops_snomask(SNO_DEBUG, L_ALL,
	414	"Invalid prefix (%s) from %s",
	415	lbuffer, client_p->name);
	416	else
	417	{
	418	memcpy(sid, lsender, 3);
	419	sid[3] = '\0';
	420	server = find_server(NULL, sid);
	421	if (server != NULL && server->from == client_p)
55abcbb2	422	sendto_one(client_p, ":%s KILL %s :%s (Unknown Client)",
d45f5ea2 JT	423	get_id(&me, client_p), lsender, me.name);
d45f5ea2 JT	424	}
212380e3 AC	425	}
	426
	427
	428
	429	/*
	430	*
	431	* parc number of arguments ('sender' counted as one!)
212380e3 AC	432	* parv[1]..parv[parc-1]
	433	* pointers to additional parameters, this is a NULL
	434	* terminated list (parv[parc] == NULL).
	435	*
	436	* WARNING
	437	* Numerics are mostly error reports. If there is something
	438	* wrong with the message, just DROP it! Don't even think of
	439	* sending back a neat error message -- big danger of creating
	440	* a ping pong error message...
	441	*/
	442	static void
4d03595d	443	do_numeric(int numeric, struct Client client_p, struct Client source_p, int parc, const char *parv[])
212380e3 AC	444	{
	445	struct Client *target_p;
	446	struct Channel *chptr;
	447
	448	if(parc < 2 \|\| !IsServer(source_p))
	449	return;
	450
	451	/* Remap low number numerics. */
4d03595d AC	452	if(numeric < 100)
4d03595d AC	453	numeric += 100;
212380e3 AC	454
	455	/*
	456	* Prepare the parameter portion of the message into 'buffer'.
	457	* (Because the buffer is twice as large as the message buffer
	458	* for the socket, no overflow can occur here... ...on current
	459	* assumptions--bets are off, if these are changed --msa)
	460	* Note: if buffer is non-empty, it will begin with SPACE.
	461	*/
	462	if(parc > 1)
	463	{
	464	char t = buffer; / Current position within the buffer */
	465	int i;
	466	int tl; /* current length of presently being built string in t */
	467	for (i = 2; i < (parc - 1); i++)
	468	{
5203cba5	469	tl = sprintf(t, " %s", parv[i]);
212380e3 AC	470	t += tl;
212380e3 AC	471	}
5203cba5	472	sprintf(t, " :%s", parv[parc - 1]);
212380e3 AC	473	}
	474
	475	if((target_p = find_client(parv[1])) != NULL)
	476	{
	477	if(IsMe(target_p))
	478	{
	479	/*
	480	* We shouldn't get numerics sent to us,
	481	* any numerics we do get indicate a bug somewhere..
	482	*/
	483	/* ugh. this is here because of nick collisions. when two servers
	484	* relink, they burst each other their nicks, then perform collides.
	485	* if there is a nick collision, BOTH servers will kill their own
	486	* nicks, and BOTH will kill the other servers nick, which wont exist,
	487	* because it will have been already killed by the local server.
	488	*
	489	* unfortunately, as we cant guarantee other servers will do the
55abcbb2	490	* "right thing" on a nick collision, we have to keep both kills.
212380e3 AC	491	* ergo we need to ignore ERR_NOSUCHNICK. --fl_
	492	*/
	493	/* quick comment. This _was_ tried. i.e. assume the other servers
	494	* will do the "right thing" and kill a nick that is colliding.
	495	* unfortunately, it did not work. --Dianora
	496	*/
	497	/* note, now we send PING on server connect, we can
	498	* also get ERR_NOSUCHSERVER..
	499	*/
4d03595d AC	500	if(numeric != ERR_NOSUCHNICK &&
4d03595d AC	501	numeric != ERR_NOSUCHSERVER)
212380e3	502	sendto_realops_snomask(SNO_GENERAL, L_ADMIN,
4d03595d	503	"*** %s(via %s) sent a %03d numeric to me: %s",
212380e3 AC	504	source_p->name,
	505	client_p->name, numeric, buffer);
	506	return;
	507	}
	508	else if(target_p->from == client_p)
	509	{
	510	/* This message changed direction (nick collision?)
	511	* ignore it.
	512	*/
	513	return;
	514	}
	515
	516	/* csircd will send out unknown umode flag for +a (admin), drop it here. */
4d03595d	517	if(numeric == ERR_UMODEUNKNOWNFLAG && MyClient(target_p))
212380e3 AC	518	return;
	519
	520	/* Fake it for server hiding, if its our client */
4d03595d	521	sendto_one(target_p, ":%s %03d %s%s",
55abcbb2	522	get_id(source_p, target_p), numeric,
212380e3 AC	523	get_id(target_p, target_p), buffer);
	524	return;
	525	}
	526	else if((chptr = find_channel(parv[1])) != NULL)
06b697a2	527	sendto_channel_flags(client_p, ALL_MEMBERS, source_p, chptr,
4d03595d	528	"%03d %s%s",
06b697a2	529	numeric, chptr->chname, buffer);
212380e3 AC	530	}
	531
	532	static void do_alias(struct alias_entry aptr, struct Client source_p, char *text)
	533	{
	534	char *p;
	535	struct Client *target_p;
	536
	537	if (!IsFloodDone(source_p) && source_p->localClient->receiveM > 20)
	538	flood_endgrace(source_p);
	539
	540	p = strchr(aptr->target, '@');
	541	if (p != NULL)
	542	{
	543	/* user@server */
	544	target_p = find_server(NULL, p + 1);
	545	if (target_p != NULL && IsMe(target_p))
	546	target_p = NULL;
	547	}
	548	else
	549	{
	550	/* nick, must be +S */
	551	target_p = find_named_person(aptr->target);
	552	if (target_p != NULL && !IsService(target_p))
	553	target_p = NULL;
	554	}
	555
	556	if (target_p == NULL)
	557	{
	558	sendto_one_numeric(source_p, ERR_SERVICESDOWN, form_str(ERR_SERVICESDOWN), aptr->target);
	559	return;
	560	}
	561
	562	if (text != NULL && *text == ':')
	563	text++;
	564	if (text == NULL \|\| *text == '\0')
	565	{
	566	sendto_one(source_p, form_str(ERR_NOTEXTTOSEND), me.name, source_p->name);
	567	return;
	568	}
	569
	570	/* increment the hitcounter on this alias */
	571	aptr->hits++;
	572
	573	sendto_one(target_p, ":%s PRIVMSG %s :%s",
	574	get_id(source_p, target_p),
	575	p != NULL ? aptr->target : get_id(target_p, target_p),
	576	text);
	577	}
	578
3c7d6fcc	579	void
4a84a763	580	m_not_oper(struct MsgBuf msgbuf_p, struct Client client_p, struct Client source_p, int parc, const char parv[])
212380e3 AC	581	{
212380e3 AC	582	sendto_one_numeric(source_p, ERR_NOPRIVILEGES, form_str(ERR_NOPRIVILEGES));
212380e3 AC	583	}
212380e3 AC	584
3c7d6fcc	585	void
4a84a763	586	m_unregistered(struct MsgBuf msgbuf_p, struct Client client_p, struct Client source_p, int parc, const char parv[])
212380e3 AC	587	{
	588	/* bit of a hack.
	589	* I don't =really= want to waste a bit in a flag
	590	* number_of_nick_changes is only really valid after the client
	591	* is fully registered..
	592	*/
	593	if(client_p->localClient->number_of_nick_changes == 0)
	594	{
	595	sendto_one(client_p, form_str(ERR_NOTREGISTERED), me.name);
	596	client_p->localClient->number_of_nick_changes++;
	597	}
212380e3 AC	598	}
212380e3 AC	599
3c7d6fcc	600	void
4a84a763	601	m_registered(struct MsgBuf msgbuf_p, struct Client client_p, struct Client source_p, int parc, const char parv[])
212380e3 AC	602	{
212380e3 AC	603	sendto_one(client_p, form_str(ERR_ALREADYREGISTRED), me.name, source_p->name);
212380e3 AC	604	}
212380e3 AC	605
3c7d6fcc	606	void
4a84a763	607	m_ignore(struct MsgBuf msgbuf_p, struct Client client_p, struct Client source_p, int parc, const char parv[])
212380e3	608	{
3c7d6fcc	609	/* Does nothing */
212380e3	610	}