m_server.c

Unreal irc 服务器源代码

/*
 *   IRC - Internet Relay Chat, src/modules/out.c
 *   (C) 2004 The UnrealIRCd Team
 *
 *   See file AUTHORS in IRC package for additional names of
 *   the programmers.
 *
 *   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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include "config.h"
#include "struct.h"
#include "common.h"
#include "sys.h"
#include "numeric.h"
#include "msg.h"
#include "proto.h"
#include "channel.h"
#include <time.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _WIN32
#include <io.h>
#endif
#include <fcntl.h>
#include "h.h"
#ifdef STRIPBADWORDS
#include "badwords.h"
#endif
#include "version.h"

void send_channel_modes(aClient *cptr, aChannel *chptr);
void send_channel_modes_sjoin(aClient *cptr, aChannel *chptr);
void send_channel_modes_sjoin3(aClient *cptr, aChannel *chptr);
DLLFUNC int m_server(aClient *cptr, aClient *sptr, int parc, char *parv[]);

static char buf[BUFSIZE];


#define MSG_SERVER 	"SERVER"	
#define TOK_SERVER 	"'"	

ModuleHeader MOD_HEADER(m_server)
  = {
	"m_server",
	"$Id: m_server.c,v 1.1.6.8 2006/12/22 21:10:33 syzop Exp $",
	"command /server", 
	"3.2-b8-1",
	NULL 
    };

DLLFUNC int MOD_INIT(m_server)(ModuleInfo *modinfo)
{
	add_CommandX(MSG_SERVER, TOK_SERVER, m_server, MAXPARA, M_UNREGISTERED|M_SERVER);
	MARK_AS_OFFICIAL_MODULE(modinfo);
	return MOD_SUCCESS;
}

DLLFUNC int MOD_LOAD(m_server)(int module_load)
{
	return MOD_SUCCESS;
}

DLLFUNC int MOD_UNLOAD(m_server)(int module_unload)
{
	if (del_Command(MSG_SERVER, TOK_SERVER, m_server) < 0)
	{
		sendto_realops("Failed to delete commands when unloading %s",
			MOD_HEADER(m_server).name);
	}
	return MOD_SUCCESS;
}

int m_server_synch(aClient *cptr, long numeric, ConfigItem_link *conf);

/*
** m_server
**	parv[0] = sender prefix
**	parv[1] = servername
**      parv[2] = hopcount
**      parv[3] = numeric
**      parv[4] = serverinfo
**
** on old protocols, serverinfo is parv[3], and numeric is left out
**
**  Recode 2001 by Stskeeps
*/
DLLFUNC CMD_FUNC(m_server)
{
	char *servername = NULL;	/* Pointer for servername */
 /*	char *password = NULL; */
	char *ch = NULL;	/* */
	char *inpath = get_client_name(cptr, TRUE);
	aClient *acptr = NULL, *ocptr = NULL;
	ConfigItem_ban *bconf;
	int  hop = 0, numeric = 0;
	char info[REALLEN + 61];
	ConfigItem_link *aconf = NULL;
	ConfigItem_deny_link *deny;
	char *flags = NULL, *protocol = NULL, *inf = NULL, *num = NULL;


	/* Ignore it  */
	if (IsPerson(sptr))
	{
		sendto_one(cptr, err_str(ERR_ALREADYREGISTRED),
		    me.name, parv[0]);
		sendto_one(cptr,
		    ":%s %s %s :*** Sorry, but your IRC program doesn't appear to support changing servers.",
		    me.name, IsWebTV(cptr) ? "PRIVMSG" : "NOTICE", cptr->name);
		sptr->since += 7;
		return 0;
	}

	/*
	 *  We do some parameter checks now. We want atleast upto serverinfo now
	 */
	if (parc < 4 || (!*parv[3]))
	{
		sendto_one(sptr, "ERROR :Not enough SERVER parameters");
		return exit_client(cptr, sptr, &me, 
			"Not enough parameters");		
	}

	if (IsUnknown(cptr) && (cptr->listener->umodes & LISTENER_CLIENTSONLY))
	{
		return exit_client(cptr, sptr, &me,
		    "This port is for clients only");
	}

	/* Now, let us take a look at the parameters we got
	 * Passes here:
	 *    Check for bogus server name
	 */

	servername = parv[1];
	/* Cut off if too big */
	if (strlen(servername) > HOSTLEN)
		servername[HOSTLEN] = '\0';
	/* Check if bogus, like spaces and ~'s */
	for (ch = servername; *ch; ch++)
		if (*ch <= ' ' || *ch > '~')
			break;
	if (*ch || !index(servername, '.'))
	{
		sendto_one(sptr, "ERROR :Bogus server name (%s)", servername);
		sendto_snomask
		    (SNO_JUNK,
		    "WARNING: Bogus server name (%s) from %s (maybe just a fishy client)",
		    servername, get_client_name(cptr, TRUE));

		return exit_client(cptr, sptr, &me, "Bogus server name");
	}

	if ((IsUnknown(cptr) || IsHandshake(cptr)) && !cptr->passwd)
	{
		sendto_one(sptr, "ERROR :Missing password");
		return exit_client(cptr, sptr, &me, "Missing password");
	}

	/*
	 * Now, we can take a look at it all
	 */
	if (IsUnknown(cptr) || IsHandshake(cptr))
	{
		char xerrmsg[256];
		ConfigItem_link *link;
		
		strcpy(xerrmsg, "No matching link configuration");
		/* First check if the server is in the list */
		if (!servername) {
			strcpy(xerrmsg, "Null servername");
			goto errlink;
		}
		if (cptr->serv && cptr->serv->conf)
		{
			/* We already know what block we are dealing with (outgoing connect!) */
			link = cptr->serv->conf;
		} else {
			/* Hunt the linkblock down ;) */
			for(link = conf_link; link; link = (ConfigItem_link *) link->next)
				if (!match(link->servername, servername))
					break;
		}
		if (!link) {
			snprintf(xerrmsg, 256, "No link block named '%s'", servername);
			goto errlink;
		}
		if (link->username && match(link->username, cptr->username)) {
			snprintf(xerrmsg, 256, "Username '%s' didn't match '%s'",
				cptr->username, link->username);
			/* I assume nobody will have 2 link blocks with the same servername
			 * and different username. -- Syzop
			 */
			goto errlink;
		}
		/* For now, we don't check based on DNS, it is slow, and IPs are better.
		 * We also skip checking if link::options::nohostcheck is set.
		 */
		if (link->options & CONNECT_NOHOSTCHECK)
		{
			aconf = link;
			goto nohostcheck;
		}
		aconf = Find_link(cptr->username, cptr->sockhost, cptr->sockhost,
		    servername);
		
#ifdef INET6
		/*  
		 * We first try match on uncompressed form ::ffff:192.168.1.5 thing included
		*/
		if (!aconf)
			aconf = Find_link(cptr->username, cptr->sockhost, Inet_ia2pNB(&cptr->ip, 0), servername);
		/* 
		 * Then on compressed 
		*/
		if (!aconf)
			aconf = Find_link(cptr->username, cptr->sockhost, Inet_ia2pNB(&cptr->ip, 1), servername);
#endif		
		if (!aconf)
		{
			snprintf(xerrmsg, 256, "Server is in link block but IP/host didn't match");
errlink:
			/* Send the "simple" error msg to the server */
			sendto_one(cptr,
			    "ERROR :Link denied (No matching link configuration) %s",
			    inpath);
			/* And send the "verbose" error msg only to local failops */
			sendto_locfailops
			    ("Link denied for %s(%s@%s) (%s) %s",
			    servername, cptr->username, cptr->sockhost, xerrmsg, inpath);
			return exit_client(cptr, sptr, &me,
			    "Link denied (No matching link configuration)");
		}
nohostcheck:
		/* Now for checking passwords */
		if (Auth_Check(cptr, aconf->recvauth, cptr->passwd) == -1)
		{
			sendto_one(cptr,
			    "ERROR :Link denied (Authentication failed) %s",
			    inpath);
			sendto_locfailops
			    ("Link denied (Authentication failed [Bad password?]) %s", inpath);
			return exit_client(cptr, sptr, &me,
			    "Link denied (Authentication failed)");
		}

		/*
		 * Third phase, we check that the server does not exist
		 * already
		 */
		if ((acptr = find_server(servername, NULL)))
		{
			/* Found. Bad. Quit. */
			acptr = acptr->from;
			ocptr =
			    (cptr->firsttime > acptr->firsttime) ? acptr : cptr;
			acptr =
			    (cptr->firsttime > acptr->firsttime) ? cptr : acptr;
			sendto_one(acptr,
			    "ERROR :Server %s already exists from %s",
			    servername,
			    (ocptr->from ? ocptr->from->name : "<nobody>"));
			sendto_realops
			    ("Link %s cancelled, server %s already exists from %s",
			    get_client_name(acptr, TRUE), servername,
			    (ocptr->from ? ocptr->from->name : "<nobody>"));
			return exit_client(acptr, acptr, acptr,
			    "Server Exists");
		}
		if ((bconf = Find_ban(NULL, servername, CONF_BAN_SERVER)))
		{
			sendto_realops
				("Cancelling link %s, banned server",
				get_client_name(cptr, TRUE));
			sendto_one(cptr, "ERROR :Banned server (%s)", bconf->reason ? bconf->reason : "no reason");
			return exit_client(cptr, cptr, &me, "Banned server");
		}
		if (aconf->class->clients + 1 > aconf->class->maxclients)
		{
			sendto_realops
				("Cancelling link %s, full class",
					get_client_name(cptr, TRUE));
			return exit_client(cptr, cptr, &me, "Full class");
		}
		/* OK, let us check in the data now now */
		hop = TS2ts(parv[2]);
		numeric = (parc > 4) ? TS2ts(parv[3]) : 0;
		if ((numeric < 0) || (numeric > 255))
		{
			sendto_realops
				("Cancelling link %s, invalid numeric",
					get_client_name(cptr, TRUE));
			return exit_client(cptr, cptr, &me, "Invalid numeric");
		}
		strncpyzt(info, parv[parc - 1], REALLEN + 61);
		strncpyzt(cptr->name, servername, sizeof(cptr->name));
		cptr->hopcount = hop;
		/* Add ban server stuff */
		if (SupportVL(cptr))
		{
			/* we also have a fail safe incase they say they are sending
			 * VL stuff and don't -- codemastr
			 */
			ConfigItem_deny_version *vlines;
			inf = NULL;
			protocol = NULL;
			flags = NULL;
			num = NULL;
			protocol = (char *)strtok((char *)info, "-");
			if (protocol)
				flags = (char *)strtok((char *)NULL, "-");
			if (flags)
				num = (char *)strtok((char *)NULL, " ");
			if (num)
				inf = (char *)strtok((char *)NULL, "");
			if (inf) {
				strncpyzt(cptr->info, inf[0] ? inf : me.name,
				    sizeof(cptr->info));

				for (vlines = conf_deny_version; vlines; vlines = (ConfigItem_deny_version *) vlines->next) {
					if (!match(vlines->mask, cptr->name))
						break;
				}
				if (vlines) {
					char *proto = vlines->version;
					char *vflags = vlines->flags;
					int version, result = 0, i;
					protocol++;
					version = atoi(protocol);
					switch (*proto) {
						case '<':
							proto++;
							if (version < atoi(proto))
								result = 1;
							break;
						case '>':
							proto++;
							if (version > atoi(proto))
								result = 1;
							break;
						case '=':
							proto++;
							if (version == atoi(proto))
								result = 1;
							break;
						case '!':
							proto++;
							if (version != atoi(proto))
								result = 1;
							break;
						default:
							if (version == atoi(proto))
								result = 1;
							break;
					}
					if (version == 0 || *proto == '*')
						result = 0;

					if (result)
						return exit_client(cptr, cptr, cptr,
							"Denied by V:line");

					for (i = 0; vflags[i]; i++) {
						if (vflags[i] == '!') {
							i++;
							if (strchr(flags, vflags[i])) {
								result = 1;
								break;
							}
						}
						else if (!strchr(flags, vflags[i])) {
								result = 1;
								break;
						}
					}
					if (*vflags == '*' || !strcmp(flags, "0"))
						result = 0;
					if (result)
						return exit_client(cptr, cptr, cptr,
							"Denied by V:line");
				}
			}
			else
				strncpyzt(cptr->info, info[0] ? info : me.name,
				    sizeof(cptr->info));

		}
		else
				strncpyzt(cptr->info, info[0] ? info : me.name,
					sizeof(cptr->info));
		/* Numerics .. */
		numeric = num ? atol(num) : numeric;
		if (numeric)
		{
			if ((numeric < 0) || (numeric > 254))
			{
				sendto_locfailops("Link %s denied, numeric '%d' out of range (should be 0-254)",
					inpath, numeric);

				return exit_client(cptr, cptr, cptr,
				    "Numeric out of range (0-254)");
			}
			if (numeric_collides(numeric))
			{
				sendto_locfailops("Link %s denied, colliding server numeric",
					inpath);

				return exit_client(cptr, cptr, cptr,
				    "Colliding server numeric (choose another)");
			}
		}
		for (deny = conf_deny_link; deny; deny = (ConfigItem_deny_link *) deny->next) {
			if (deny->flag.type == CRULE_ALL && !match(deny->mask, servername)
				&& crule_eval(deny->rule)) {
				sendto_ops("Refused connection from %s.",
					get_client_host(cptr));
				return exit_client(cptr, cptr, cptr,
					"Disallowed by connection rule");
			}
		}
		if (aconf->options & CONNECT_QUARANTINE)
			cptr->flags |= FLAGS_QUARANTINE;
		/* Start synch now */
		if (m_server_synch(cptr, numeric, aconf) == FLUSH_BUFFER)
			return FLUSH_BUFFER;
	}
	else
	{
		return m_server_remote(cptr, sptr, parc, parv);
	}
	return 0;
}

CMD_FUNC(m_server_remote)
{
	aClient *acptr, *ocptr, *bcptr;
	ConfigItem_link	*aconf;
	ConfigItem_ban *bconf;
	int 	hop;
	char	info[REALLEN + 61];
	long	numeric = 0;
	char	*servername = parv[1];
	int	i;

	if ((acptr = find_server(servername, NULL)))
	{
		/* Found. Bad. Quit. */
		acptr = acptr->from;
		ocptr =
		    (cptr->firsttime > acptr->firsttime) ? acptr : cptr;
		acptr =
		    (cptr->firsttime > acptr->firsttime) ? cptr : acptr;
		sendto_one(acptr,
		    "ERROR :Server %s already exists from %s",
		    servername,
		    (ocptr->from ? ocptr->from->name : "<nobody>"));
		sendto_realops
		    ("Link %s cancelled, server %s already exists from %s",
		    get_client_name(acptr, TRUE), servername,
		    (ocptr->from ? ocptr->from->name : "<nobody>"));
		if (acptr == cptr) {
			return exit_client(acptr, acptr, acptr, "Server Exists");
		} else {
			/* AFAIK this can cause crashes if this happends remotely because
			 * we will still receive msgs for some time because of lag.
			 * Two possible solutions: unlink the directly connected server (cptr)
			 * and/or fix all those commands which blindly trust server input. -- Syzop
			 */
			exit_client(acptr, acptr, acptr, "Server Exists");
			return 0;
		}
	}
	if ((bconf = Find_ban(NULL, servername, CONF_BAN_SERVER)))
	{
		sendto_realops
			("Cancelling link %s, banned server %s",
			get_client_name(cptr, TRUE), servername);
		sendto_one(cptr, "ERROR :Banned server (%s)", bconf->reason ? bconf->reason : "no reason");
		return exit_client(cptr, cptr, &me, "Brought in banned server");
	}
	/* OK, let us check in the data now now */
	hop = TS2ts(parv[2]);
	numeric = (parc > 4) ? TS2ts(parv[3]) : 0;
	if ((numeric < 0) || (numeric > 255))
	{
		sendto_realops
			("Cancelling link %s, invalid numeric at server %s",
				get_client_name(cptr, TRUE), servername);
		sendto_one(cptr, "ERROR :Invalid numeric (%s)",
			servername);
		return exit_client(cptr, cptr, &me, "Invalid remote numeric");
	}
	strncpyzt(info, parv[parc - 1], REALLEN + 61);
	if (!cptr->serv->conf)
	{
		sendto_realops("Lost conf for %s!!, dropping link", cptr->name);
		return exit_client(cptr, cptr, cptr, "Lost configuration");
	}