[solanum.git] / modules / m_cap.c

/* modules/m_cap.c
 *
 *  Copyright (C) 2005 Lee Hardy <lee@leeh.co.uk>
 *  Copyright (C) 2005 ircd-ratbox development team
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * 1.Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * 2.Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * 3.The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * $Id: m_cap.c 676 2006-02-03 20:05:09Z gxti $
 */

#include "stdinc.h"
#include "class.h"
#include "client.h"
#include "match.h"
#include "ircd.h"
#include "numeric.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
#include "s_serv.h"
#include "s_user.h"
#include "send.h"
#include "s_conf.h"
#include "hash.h"

typedef int (*bqcmp)(const void *, const void *);

static int m_cap(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
static int modinit(void);

struct Message cap_msgtab = {
	"CAP", 0, 0, 0, 0,
	{{m_cap, 2}, {m_cap, 2}, mg_ignore, mg_ignore, mg_ignore, {m_cap, 2}}
};

mapi_clist_av1 cap_clist[] = { &cap_msgtab, NULL };
DECLARE_MODULE_AV1(cap, modinit, NULL, cap_clist, NULL, NULL, "$Revision: 676 $");

#define _CLICAP(name, capserv, capclient, caprequired, flags)	\
	{ (name), (capserv), (capclient), (caprequired), (flags), sizeof(name) - 1 }

#define CLICAP_FLAGS_STICKY	0x001

static struct clicap
{
	const char *name;
	int cap_serv;		/* for altering s->c */
	int cap_cli;		/* for altering c->s */
	int cap_required_serv;	/* required dependency cap */
	int flags;
	int namelen;
} clicap_list[] = {
	_CLICAP("multi-prefix",	CLICAP_MULTI_PREFIX, 0, 0, 0),
	_CLICAP("sasl", CLICAP_SASL, 0, 0, CLICAP_FLAGS_STICKY),
	_CLICAP("account-notify", CLICAP_ACCOUNT_NOTIFY, 0, 0, 0),
	_CLICAP("extended-join", CLICAP_EXTENDED_JOIN, 0, 0, 0),
	_CLICAP("away-notify", CLICAP_AWAY_NOTIFY, 0, 0, 0),
	_CLICAP("tls", CLICAP_TLS, 0, 0, 0),
	_CLICAP("userhost-in-names", CLICAP_USERHOST_IN_NAMES, 0, 0, 0),
	_CLICAP("cap-notify", CLICAP_CAP_NOTIFY, 0, 0, 0),
	_CLICAP("chghost", CLICAP_CHGHOST, 0, 0, 0),
};

#define CLICAP_LIST_LEN (sizeof(clicap_list) / sizeof(struct clicap))

static int clicap_sort(struct clicap *, struct clicap *);

static int
modinit(void)
{
	qsort(clicap_list, CLICAP_LIST_LEN, sizeof(struct clicap),
		(bqcmp) clicap_sort);
	return 0;
}

static int
clicap_sort(struct clicap *one, struct clicap *two)
{
	return irccmp(one->name, two->name);
}

static int
clicap_compare(const char *name, struct clicap *cap)
{
	return irccmp(name, cap->name);
}

/* clicap_find()
 *   Used iteratively over a buffer, extracts individual cap tokens.
 *
 * Inputs: buffer to start iterating over (NULL to iterate over existing buf)
 *         int pointer to whether the cap token is negated
 *         int pointer to whether we finish with success
 * Ouputs: Cap entry if found, NULL otherwise.
 */
static struct clicap *
clicap_find(const char *data, int *negate, int *finished)
{
	static char buf[BUFSIZE];
	static char *p;
	struct clicap *cap;
	char *s;

	*negate = 0;

	if(data)
	{
		rb_strlcpy(buf, data, sizeof(buf));
		p = buf;
	}

	if(*finished)
		return NULL;

	/* skip any whitespace */
	while(*p && IsSpace(*p))
		p++;

	if(EmptyString(p))
	{
		*finished = 1;
		return NULL;
	}

	if(*p == '-')
	{
		*negate = 1;
		p++;

		/* someone sent a '-' without a parameter.. */
		if(*p == '\0')
			return NULL;
	}

	if((s = strchr(p, ' ')))
		*s++ = '\0';

	if((cap = bsearch(p, clicap_list, CLICAP_LIST_LEN,
				sizeof(struct clicap), (bqcmp) clicap_compare)))
	{
		if(s)
			p = s;
		else
			*finished = 1;
	}

	return cap;
}

/* clicap_generate()
 *   Generates a list of capabilities.
 *
 * Inputs: client to send to, subcmd to send,
 *         flags to match against: 0 to do none, -1 if client has no flags,
 *         int to whether we are doing CAP CLEAR
 * Outputs: None
 */
static void
clicap_generate(struct Client *source_p, const char *subcmd, int flags, int clear)
{
	char buf[BUFSIZE];
	char capbuf[BUFSIZE];
	char *p;
	int buflen = 0;
	int curlen, mlen;
	size_t i;

	mlen = sprintf(buf, ":%s CAP %s %s",
			me.name,
			EmptyString(source_p->name) ? "*" : source_p->name,
			subcmd);

	p = capbuf;
	buflen = mlen;

	/* shortcut, nothing to do */
	if(flags == -1)
	{
		sendto_one(source_p, "%s :", buf);
		return;
	}

	for(i = 0; i < CLICAP_LIST_LEN; i++)
	{
		if(flags)
		{
			if(!IsCapable(source_p, clicap_list[i].cap_serv))
				continue;
			/* they are capable of this, check sticky */
			else if(clear && clicap_list[i].flags & CLICAP_FLAGS_STICKY)
				continue;
		}

		if (clicap_list[i].cap_serv == CLICAP_SASL)
		{
			struct Client *agent_p = NULL;

			if (!ConfigFileEntry.sasl_service)
				continue;

			agent_p = find_named_client(ConfigFileEntry.sasl_service);
			if (agent_p == NULL || !IsService(agent_p))
				continue;
		}

		/* \r\n\0, possible "-~=", space, " *" */
		if(buflen + clicap_list[i].namelen >= BUFSIZE - 10)
		{
			/* remove our trailing space -- if buflen == mlen
			 * here, we didnt even succeed in adding one.
			 */
			if(buflen != mlen)
				*(p - 1) = '\0';
			else
				*p = '\0';

			sendto_one(source_p, "%s * :%s", buf, capbuf);
			p = capbuf;
			buflen = mlen;
		}

		if(clear)
		{
			*p++ = '-';
			buflen++;
		}

		curlen = sprintf(p, "%s ", clicap_list[i].name);
		p += curlen;
		buflen += curlen;
	}

	/* remove trailing space */
	if(buflen != mlen)
		*(p - 1) = '\0';
	else
		*p = '\0';

	sendto_one(source_p, "%s :%s", buf, capbuf);
}

static void
cap_ack(struct Client *source_p, const char *arg)
{
	struct clicap *cap;
	int capadd = 0, capdel = 0;
	int finished = 0, negate;

	if(EmptyString(arg))
		return;

	for(cap = clicap_find(arg, &negate, &finished); cap;
	    cap = clicap_find(NULL, &negate, &finished))
	{
		/* sent an ACK for something they havent REQd */
		if(!IsCapable(source_p, cap->cap_serv))
			continue;

		if(negate)
		{
			/* dont let them ack something sticky off */
			if(cap->flags & CLICAP_FLAGS_STICKY)
				continue;

			capdel |= cap->cap_cli;
		}
		else
			capadd |= cap->cap_cli;
	}

	source_p->localClient->caps |= capadd;
	source_p->localClient->caps &= ~capdel;
}

static void
cap_clear(struct Client *source_p, const char *arg)
{
	clicap_generate(source_p, "ACK",
			source_p->localClient->caps ? source_p->localClient->caps : -1, 1);

	/* XXX - sticky capabs */
#ifdef CLICAP_STICKY
	source_p->localClient->caps = source_p->localClient->caps & CLICAP_STICKY;
#else
	source_p->localClient->caps = 0;
#endif
}

static void
cap_end(struct Client *source_p, const char *arg)
{
	if(IsRegistered(source_p))
		return;

	source_p->flags &= ~FLAGS_CLICAP;

	if(source_p->name[0] && source_p->flags & FLAGS_SENTUSER)
	{
		register_local_user(source_p, source_p);
	}
}

static void
cap_list(struct Client *source_p, const char *arg)
{
	/* list of what theyre currently using */
	clicap_generate(source_p, "LIST",
			source_p->localClient->caps ? source_p->localClient->caps : -1, 0);
}

static void
cap_ls(struct Client *source_p, const char *arg)
{
	if(!IsRegistered(source_p))
		source_p->flags |= FLAGS_CLICAP;

	/* list of what we support */
	clicap_generate(source_p, "LS", 0, 0);
}

static void
cap_req(struct Client *source_p, const char *arg)
{
	char buf[BUFSIZE];
	char pbuf[2][BUFSIZE];
	struct clicap *cap;
	int buflen, plen;
	int i = 0;
	int capadd = 0, capdel = 0;
	int finished = 0, negate;

	if(!IsRegistered(source_p))
		source_p->flags |= FLAGS_CLICAP;

	if(EmptyString(arg))
		return;

	buflen = snprintf(buf, sizeof(buf), ":%s CAP %s ACK",
			me.name, EmptyString(source_p->name) ? "*" : source_p->name);

	pbuf[0][0] = '\0';
	plen = 0;

	for(cap = clicap_find(arg, &negate, &finished); cap;
	    cap = clicap_find(NULL, &negate, &finished))
	{
		/* filled the first array, but cant send it in case the
		 * request fails.  one REQ should never fill more than two
		 * buffers --fl
		 */
		if(buflen + plen + cap->namelen + 6 >= BUFSIZE)
		{
			pbuf[1][0] = '\0';
			plen = 0;
			i = 1;
		}

		if(negate)
		{
			if(cap->flags & CLICAP_FLAGS_STICKY)
			{
				finished = 0;
				break;
			}

			strcat(pbuf[i], "-");
			plen++;

			capdel |= cap->cap_serv;
		}
		else
		{
			if(cap->cap_required_serv && !((capadd & cap->cap_required_serv) == cap->cap_required_serv || IsCapable(source_p, cap->cap_required_serv)))
			{
				finished = 0;
				break;
			}

			if (cap->cap_serv == CLICAP_SASL)
			{
				struct Client *agent_p = NULL;

				if (!ConfigFileEntry.sasl_service)
				{
					finished = 0;
					break;
				}

				agent_p = find_named_client(ConfigFileEntry.sasl_service);
				if (agent_p == NULL || !IsService(agent_p))
				{
					finished = 0;
					break;
				}
			}

			capadd |= cap->cap_serv;
		}

		if(cap->cap_cli)
		{
			strcat(pbuf[i], "~");
			plen++;
		}

		strcat(pbuf[i], cap->name);
		if (!finished) {
			strcat(pbuf[i], " ");
			plen += (cap->namelen + 1);
		}
	}

	if(!finished)
	{
		sendto_one(source_p, ":%s CAP %s NAK :%s",
			me.name, EmptyString(source_p->name) ? "*" : source_p->name, arg);
		return;
	}

	if(i)
	{
		sendto_one(source_p, "%s * :%s", buf, pbuf[0]);
		sendto_one(source_p, "%s :%s", buf, pbuf[1]);
	}
	else
		sendto_one(source_p, "%s :%s", buf, pbuf[0]);

	source_p->localClient->caps |= capadd;
	source_p->localClient->caps &= ~capdel;
}

static struct clicap_cmd
{
	const char *cmd;
	void (*func)(struct Client *source_p, const char *arg);
} clicap_cmdlist[] = {
	/* This list *MUST* be in alphabetical order */
	{ "ACK",	cap_ack		},
	{ "CLEAR",	cap_clear	},
	{ "END",	cap_end		},
	{ "LIST",	cap_list	},
	{ "LS",		cap_ls		},
	{ "REQ",	cap_req		},
};

static int
clicap_cmd_search(const char *command, struct clicap_cmd *entry)
{
	return irccmp(command, entry->cmd);
}

static int
m_cap(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
	struct clicap_cmd *cmd;

	if(!(cmd = bsearch(parv[1], clicap_cmdlist,
				sizeof(clicap_cmdlist) / sizeof(struct clicap_cmd),
				sizeof(struct clicap_cmd), (bqcmp) clicap_cmd_search)))
	{
		sendto_one(source_p, form_str(ERR_INVALIDCAPCMD),
				me.name, EmptyString(source_p->name) ? "*" : source_p->name,
				parv[1]);
		return 0;
	}

	(cmd->func)(source_p, parv[2]);
	return 0;
}
Commit	Line	Data
212380e3	1	/* modules/m_cap.c
55abcbb2	2	*
212380e3 AC	3	* Copyright (C) 2005 Lee Hardy <lee@leeh.co.uk>
	4	* Copyright (C) 2005 ircd-ratbox development team
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions are
	8	* met:
	9	*
	10	* 1.Redistributions of source code must retain the above copyright notice,
	11	* this list of conditions and the following disclaimer.
	12	* 2.Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3.The name of the author may not be used to endorse or promote products
	16	* derived from this software without specific prior written permission.
	17	*
	18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	20	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	21	* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
	22	* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	23	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	24	* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	25	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	26	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	27	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	28	* POSSIBILITY OF SUCH DAMAGE.
	29	*
	30	* $Id: m_cap.c 676 2006-02-03 20:05:09Z gxti $
	31	*/
	32
	33	#include "stdinc.h"
212380e3 AC	34	#include "class.h"
212380e3 AC	35	#include "client.h"
4562c604	36	#include "match.h"
212380e3 AC	37	#include "ircd.h"
	38	#include "numeric.h"
	39	#include "msg.h"
	40	#include "parse.h"
	41	#include "modules.h"
	42	#include "s_serv.h"
	43	#include "s_user.h"
77d3d2db	44	#include "send.h"
bbce62d2	45	#include "s_conf.h"
dafbd7fa	46	#include "hash.h"
212380e3 AC	47
	48	typedef int (bqcmp)(const void , const void *);
	49
428ca87b	50	static int m_cap(struct MsgBuf , struct Client , struct Client , int, const char *);
212380e3 AC	51	static int modinit(void);
	52
	53	struct Message cap_msgtab = {
7baa37a9	54	"CAP", 0, 0, 0, 0,
212380e3 AC	55	{{m_cap, 2}, {m_cap, 2}, mg_ignore, mg_ignore, mg_ignore, {m_cap, 2}}
	56	};
	57
	58	mapi_clist_av1 cap_clist[] = { &cap_msgtab, NULL };
	59	DECLARE_MODULE_AV1(cap, modinit, NULL, cap_clist, NULL, NULL, "$Revision: 676 $");
	60
0044d400 AC	61	#define _CLICAP(name, capserv, capclient, caprequired, flags) \
0044d400 AC	62	{ (name), (capserv), (capclient), (caprequired), (flags), sizeof(name) - 1 }
212380e3 AC	63
	64	#define CLICAP_FLAGS_STICKY 0x001
	65
	66	static struct clicap
	67	{
	68	const char *name;
	69	int cap_serv; /* for altering s->c */
	70	int cap_cli; /* for altering c->s */
0044d400	71	int cap_required_serv; /* required dependency cap */
212380e3 AC	72	int flags;
	73	int namelen;
	74	} clicap_list[] = {
0044d400	75	_CLICAP("multi-prefix", CLICAP_MULTI_PREFIX, 0, 0, 0),
aaaf9faf	76	_CLICAP("sasl", CLICAP_SASL, 0, 0, CLICAP_FLAGS_STICKY),
0044d400 AC	77	_CLICAP("account-notify", CLICAP_ACCOUNT_NOTIFY, 0, 0, 0),
	78	_CLICAP("extended-join", CLICAP_EXTENDED_JOIN, 0, 0, 0),
	79	_CLICAP("away-notify", CLICAP_AWAY_NOTIFY, 0, 0, 0),
	80	_CLICAP("tls", CLICAP_TLS, 0, 0, 0),
1b54aa5c	81	_CLICAP("userhost-in-names", CLICAP_USERHOST_IN_NAMES, 0, 0, 0),
13de7083	82	_CLICAP("cap-notify", CLICAP_CAP_NOTIFY, 0, 0, 0),
4a5330bb	83	_CLICAP("chghost", CLICAP_CHGHOST, 0, 0, 0),
212380e3 AC	84	};
	85
	86	#define CLICAP_LIST_LEN (sizeof(clicap_list) / sizeof(struct clicap))
	87
	88	static int clicap_sort(struct clicap , struct clicap );
	89
	90	static int
	91	modinit(void)
	92	{
	93	qsort(clicap_list, CLICAP_LIST_LEN, sizeof(struct clicap),
	94	(bqcmp) clicap_sort);
	95	return 0;
	96	}
	97
	98	static int
	99	clicap_sort(struct clicap one, struct clicap two)
	100	{
	101	return irccmp(one->name, two->name);
	102	}
	103
	104	static int
	105	clicap_compare(const char name, struct clicap cap)
	106	{
	107	return irccmp(name, cap->name);
	108	}
	109
	110	/* clicap_find()
	111	* Used iteratively over a buffer, extracts individual cap tokens.
	112	*
	113	* Inputs: buffer to start iterating over (NULL to iterate over existing buf)
	114	* int pointer to whether the cap token is negated
	115	* int pointer to whether we finish with success
	116	* Ouputs: Cap entry if found, NULL otherwise.
	117	*/
	118	static struct clicap *
	119	clicap_find(const char data, int negate, int *finished)
	120	{
	121	static char buf[BUFSIZE];
	122	static char *p;
	123	struct clicap *cap;
	124	char *s;
	125
	126	*negate = 0;
	127
	128	if(data)
	129	{
f427c8b0	130	rb_strlcpy(buf, data, sizeof(buf));
212380e3 AC	131	p = buf;
	132	}
	133
	134	if(*finished)
	135	return NULL;
	136
	137	/* skip any whitespace */
	138	while(p && IsSpace(p))
	139	p++;
	140
	141	if(EmptyString(p))
	142	{
	143	*finished = 1;
	144	return NULL;
	145	}
	146
	147	if(*p == '-')
	148	{
	149	*negate = 1;
	150	p++;
	151
	152	/* someone sent a '-' without a parameter.. */
	153	if(*p == '\0')
	154	return NULL;
	155	}
	156
	157	if((s = strchr(p, ' ')))
	158	*s++ = '\0';
	159
55abcbb2	160	if((cap = bsearch(p, clicap_list, CLICAP_LIST_LEN,
212380e3 AC	161	sizeof(struct clicap), (bqcmp) clicap_compare)))
	162	{
	163	if(s)
	164	p = s;
	165	else
	166	*finished = 1;
	167	}
	168
	169	return cap;
	170	}
	171
	172	/* clicap_generate()
	173	* Generates a list of capabilities.
	174	*
	175	* Inputs: client to send to, subcmd to send,
	176	* flags to match against: 0 to do none, -1 if client has no flags,
	177	* int to whether we are doing CAP CLEAR
	178	* Outputs: None
	179	*/
	180	static void
	181	clicap_generate(struct Client source_p, const char subcmd, int flags, int clear)
	182	{
	183	char buf[BUFSIZE];
	184	char capbuf[BUFSIZE];
	185	char *p;
	186	int buflen = 0;
	187	int curlen, mlen;
34e02db6	188	size_t i;
212380e3	189
5203cba5	190	mlen = sprintf(buf, ":%s CAP %s %s",
55abcbb2 KB	191	me.name,
55abcbb2 KB	192	EmptyString(source_p->name) ? "*" : source_p->name,
212380e3 AC	193	subcmd);
	194
	195	p = capbuf;
	196	buflen = mlen;
	197
	198	/* shortcut, nothing to do */
	199	if(flags == -1)
	200	{
	201	sendto_one(source_p, "%s :", buf);
	202	return;
	203	}
	204
	205	for(i = 0; i < CLICAP_LIST_LEN; i++)
	206	{
	207	if(flags)
	208	{
	209	if(!IsCapable(source_p, clicap_list[i].cap_serv))
	210	continue;
	211	/* they are capable of this, check sticky */
	212	else if(clear && clicap_list[i].flags & CLICAP_FLAGS_STICKY)
	213	continue;
	214	}
	215
bbce62d2 MT	216	if (clicap_list[i].cap_serv == CLICAP_SASL)
	217	{
	218	struct Client *agent_p = NULL;
	219
	220	if (!ConfigFileEntry.sasl_service)
	221	continue;
	222
	223	agent_p = find_named_client(ConfigFileEntry.sasl_service);
	224	if (agent_p == NULL \|\| !IsService(agent_p))
	225	continue;
	226	}
	227
212380e3 AC	228	/* \r\n\0, possible "-~=", space, " " /
	229	if(buflen + clicap_list[i].namelen >= BUFSIZE - 10)
	230	{
	231	/* remove our trailing space -- if buflen == mlen
	232	* here, we didnt even succeed in adding one.
	233	*/
	234	if(buflen != mlen)
	235	*(p - 1) = '\0';
	236	else
	237	*p = '\0';
	238
	239	sendto_one(source_p, "%s * :%s", buf, capbuf);
	240	p = capbuf;
	241	buflen = mlen;
	242	}
	243
	244	if(clear)
	245	{
	246	*p++ = '-';
	247	buflen++;
212380e3 AC	248	}
212380e3 AC	249
5203cba5	250	curlen = sprintf(p, "%s ", clicap_list[i].name);
212380e3 AC	251	p += curlen;
	252	buflen += curlen;
	253	}
	254
	255	/* remove trailing space */
	256	if(buflen != mlen)
	257	*(p - 1) = '\0';
	258	else
	259	*p = '\0';
	260
	261	sendto_one(source_p, "%s :%s", buf, capbuf);
	262	}
	263
	264	static void
	265	cap_ack(struct Client source_p, const char arg)
	266	{
	267	struct clicap *cap;
	268	int capadd = 0, capdel = 0;
	269	int finished = 0, negate;
	270
	271	if(EmptyString(arg))
	272	return;
	273
	274	for(cap = clicap_find(arg, &negate, &finished); cap;
	275	cap = clicap_find(NULL, &negate, &finished))
	276	{
	277	/* sent an ACK for something they havent REQd */
	278	if(!IsCapable(source_p, cap->cap_serv))
	279	continue;
	280
	281	if(negate)
	282	{
	283	/* dont let them ack something sticky off */
	284	if(cap->flags & CLICAP_FLAGS_STICKY)
	285	continue;
	286
	287	capdel \|= cap->cap_cli;
	288	}
	289	else
	290	capadd \|= cap->cap_cli;
	291	}
	292
	293	source_p->localClient->caps \|= capadd;
	294	source_p->localClient->caps &= ~capdel;
	295	}
	296
	297	static void
	298	cap_clear(struct Client source_p, const char arg)
	299	{
55abcbb2	300	clicap_generate(source_p, "ACK",
212380e3 AC	301	source_p->localClient->caps ? source_p->localClient->caps : -1, 1);
	302
	303	/* XXX - sticky capabs */
	304	#ifdef CLICAP_STICKY
	305	source_p->localClient->caps = source_p->localClient->caps & CLICAP_STICKY;
	306	#else
	307	source_p->localClient->caps = 0;
	308	#endif
	309	}
	310
	311	static void
	312	cap_end(struct Client source_p, const char arg)
	313	{
	314	if(IsRegistered(source_p))
	315	return;
	316
095328a7	317	source_p->flags &= ~FLAGS_CLICAP;
212380e3	318
1fb3b1e1	319	if(source_p->name[0] && source_p->flags & FLAGS_SENTUSER)
212380e3	320	{
21251822	321	register_local_user(source_p, source_p);
212380e3 AC	322	}
	323	}
	324
	325	static void
	326	cap_list(struct Client source_p, const char arg)
	327	{
	328	/* list of what theyre currently using */
	329	clicap_generate(source_p, "LIST",
	330	source_p->localClient->caps ? source_p->localClient->caps : -1, 0);
	331	}
	332
	333	static void
	334	cap_ls(struct Client source_p, const char arg)
	335	{
	336	if(!IsRegistered(source_p))
095328a7	337	source_p->flags \|= FLAGS_CLICAP;
212380e3 AC	338
	339	/* list of what we support */
	340	clicap_generate(source_p, "LS", 0, 0);
	341	}
	342
	343	static void
	344	cap_req(struct Client source_p, const char arg)
	345	{
	346	char buf[BUFSIZE];
	347	char pbuf[2][BUFSIZE];
	348	struct clicap *cap;
	349	int buflen, plen;
	350	int i = 0;
	351	int capadd = 0, capdel = 0;
	352	int finished = 0, negate;
	353
	354	if(!IsRegistered(source_p))
095328a7	355	source_p->flags \|= FLAGS_CLICAP;
212380e3 AC	356
	357	if(EmptyString(arg))
	358	return;
	359
5203cba5	360	buflen = snprintf(buf, sizeof(buf), ":%s CAP %s ACK",
212380e3 AC	361	me.name, EmptyString(source_p->name) ? "*" : source_p->name);
	362
	363	pbuf[0][0] = '\0';
	364	plen = 0;
	365
	366	for(cap = clicap_find(arg, &negate, &finished); cap;
	367	cap = clicap_find(NULL, &negate, &finished))
	368	{
	369	/* filled the first array, but cant send it in case the
	370	* request fails. one REQ should never fill more than two
	371	* buffers --fl
	372	*/
	373	if(buflen + plen + cap->namelen + 6 >= BUFSIZE)
	374	{
	375	pbuf[1][0] = '\0';
	376	plen = 0;
	377	i = 1;
	378	}
	379
	380	if(negate)
	381	{
	382	if(cap->flags & CLICAP_FLAGS_STICKY)
	383	{
	384	finished = 0;
	385	break;
	386	}
	387
	388	strcat(pbuf[i], "-");
	389	plen++;
	390
	391	capdel \|= cap->cap_serv;
	392	}
	393	else
	394	{
3a48406b	395	if(cap->cap_required_serv && !((capadd & cap->cap_required_serv) == cap->cap_required_serv \|\| IsCapable(source_p, cap->cap_required_serv)))
0044d400 AC	396	{
	397	finished = 0;
	398	break;
	399	}
	400
bbce62d2 MT	401	if (cap->cap_serv == CLICAP_SASL)
	402	{
	403	struct Client *agent_p = NULL;
	404
	405	if (!ConfigFileEntry.sasl_service)
	406	{
	407	finished = 0;
	408	break;
	409	}
	410
	411	agent_p = find_named_client(ConfigFileEntry.sasl_service);
	412	if (agent_p == NULL \|\| !IsService(agent_p))
	413	{
	414	finished = 0;
	415	break;
	416	}
	417	}
	418
212380e3 AC	419	capadd \|= cap->cap_serv;
	420	}
	421
	422	if(cap->cap_cli)
	423	{
	424	strcat(pbuf[i], "~");
	425	plen++;
	426	}
	427
	428	strcat(pbuf[i], cap->name);
d855e13e VL	429	if (!finished) {
	430	strcat(pbuf[i], " ");
	431	plen += (cap->namelen + 1);
	432	}
212380e3 AC	433	}
	434
	435	if(!finished)
	436	{
	437	sendto_one(source_p, ":%s CAP %s NAK :%s",
	438	me.name, EmptyString(source_p->name) ? "*" : source_p->name, arg);
	439	return;
	440	}
	441
	442	if(i)
	443	{
	444	sendto_one(source_p, "%s * :%s", buf, pbuf[0]);
	445	sendto_one(source_p, "%s :%s", buf, pbuf[1]);
	446	}
	447	else
	448	sendto_one(source_p, "%s :%s", buf, pbuf[0]);
	449
	450	source_p->localClient->caps \|= capadd;
	451	source_p->localClient->caps &= ~capdel;
	452	}
	453
	454	static struct clicap_cmd
	455	{
	456	const char *cmd;
	457	void (func)(struct Client source_p, const char *arg);
	458	} clicap_cmdlist[] = {
	459	/* This list MUST be in alphabetical order */
	460	{ "ACK", cap_ack },
	461	{ "CLEAR", cap_clear },
	462	{ "END", cap_end },
	463	{ "LIST", cap_list },
	464	{ "LS", cap_ls },
	465	{ "REQ", cap_req },
	466	};
	467
	468	static int
	469	clicap_cmd_search(const char command, struct clicap_cmd entry)
	470	{
	471	return irccmp(command, entry->cmd);
	472	}
	473
	474	static int
428ca87b	475	m_cap(struct MsgBuf msgbuf_p, struct Client client_p, struct Client source_p, int parc, const char parv[])
212380e3 AC	476	{
	477	struct clicap_cmd *cmd;
	478
	479	if(!(cmd = bsearch(parv[1], clicap_cmdlist,
	480	sizeof(clicap_cmdlist) / sizeof(struct clicap_cmd),
	481	sizeof(struct clicap_cmd), (bqcmp) clicap_cmd_search)))
	482	{
	483	sendto_one(source_p, form_str(ERR_INVALIDCAPCMD),
48a038f4 JT	484	me.name, EmptyString(source_p->name) ? "*" : source_p->name,
48a038f4 JT	485	parv[1]);
212380e3 AC	486	return 0;
	487	}
	488
	489	(cmd->func)(source_p, parv[2]);
	490	return 0;
	491	}