[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
 *  Copyright (C) 2016 William Pitcock <nenolod@dereferenced.org>
 *
 * 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.
 */

#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"

static const char cap_desc[] = "Provides the commands used for client capability negotiation";

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

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

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_AV2(cap, NULL, NULL, cap_clist, NULL, NULL, NULL, NULL, cap_desc);

#define IsCapableEntry(c, e)		IsCapable(c, 1 << (e)->value)
#define HasCapabilityFlag(c, f)		(c->ownerdata != NULL && (((struct ClientCapability *)c->ownerdata)->flags & (f)) == f)

static inline int
clicap_visible(struct Client *client_p, const struct CapabilityEntry *cap)
{
	struct ClientCapability *clicap;

	/* orphaned caps shouldn't be visible */
	if (cap->flags & CAP_ORPHANED)
		return 0;

	if (cap->ownerdata == NULL)
		return 1;

	clicap = cap->ownerdata;
	if (clicap->visible == NULL)
		return 1;

	return clicap->visible(client_p);
}

/* 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 CapabilityEntry *
clicap_find(const char *data, int *negate, int *finished)
{
	static char buf[BUFSIZE];
	static char *p;
	struct CapabilityEntry *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 = capability_find(cli_capindex, p)) != NULL)
	{
		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
 * Outputs: None
 */
static void
clicap_generate(struct Client *source_p, const char *subcmd, int flags)
{
	char buf[BUFSIZE] = { 0 };
	char capbuf[BUFSIZE] = { 0 };
	int buflen = 0;
	int mlen;
	struct CapabilityEntry *entry;
	rb_dictionary_iter iter;

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

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

	RB_DICTIONARY_FOREACH(entry, &iter, cli_capindex->cap_dict)
	{
		size_t caplen = 0;
		struct ClientCapability *clicap = entry->ownerdata;
		const char *data = NULL;

		if(flags && !IsCapableEntry(source_p, entry))
			continue;

		if (!clicap_visible(source_p, entry))
			continue;

		caplen = strlen(entry->cap);
		if (!flags && (source_p->flags & FLAGS_CLICAP_DATA) && clicap != NULL && clicap->data != NULL)
			data = clicap->data(source_p);

		if (data != NULL)
			caplen += strlen(data) + 1;

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

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

			buflen = mlen;
			memset(capbuf, 0, sizeof capbuf);
		}

		buflen = rb_snprintf_append(capbuf, sizeof capbuf, "%s%s%s ",
				entry->cap, data != NULL ? "=" : "", data != NULL ? data : "");
	}

	/* remove trailing space */
	capbuf[buflen] = '\0';

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

static void
cap_ack(struct Client *source_p, const char *arg)
{
	struct CapabilityEntry *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(!IsCapableEntry(source_p, cap))
			continue;

		if(negate)
		{
			/* dont let them ack something sticky off */
			if(HasCapabilityFlag(cap, CLICAP_FLAGS_STICKY))
				continue;

			capdel |= (1 << cap->value);
		}
		else
			capadd |= (1 << cap->value);
	}

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

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);
}

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

	if (arg != NULL && !strcmp(arg, "302"))
	{
		source_p->flags |= FLAGS_CLICAP_DATA;
		source_p->localClient->caps |= CLICAP_CAP_NOTIFY;
	}

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

static void
cap_req(struct Client *source_p, const char *arg)
{
	char buf[BUFSIZE];
	char pbuf[2][BUFSIZE];
	struct CapabilityEntry *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))
	{
		size_t namelen = strlen(cap->cap);

		/* 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 + namelen + 6 >= BUFSIZE)
		{
			pbuf[1][0] = '\0';
			plen = 0;
			i = 1;
		}

		if(negate)
		{
			if(HasCapabilityFlag(cap, CLICAP_FLAGS_STICKY))
			{
				finished = 0;
				break;
			}

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

			capdel |= (1 << cap->value);
		}
		else
		{
			if (!clicap_visible(source_p, cap))
			{
				finished = 0;
				break;
			}

			capadd |= (1 << cap->value);
		}

		/* XXX this probably should exclude REQACK'd caps from capadd/capdel, but keep old behaviour for now */
		if(HasCapabilityFlag(cap, CLICAP_FLAGS_REQACK))
		{
			strcat(pbuf[i], "~");
			plen++;
		}

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

	(cmd->func)(source_p, parv[2]);
}
Commit	Line	Data
212380e3	1	/* modules/m_cap.c
55abcbb2	2	*
212380e3 AC	3	* Copyright (C) 2005 Lee Hardy <lee@leeh.co.uk>
212380e3 AC	4	* Copyright (C) 2005 ircd-ratbox development team
32df5e96	5	* Copyright (C) 2016 William Pitcock <nenolod@dereferenced.org>
212380e3 AC	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions are
	9	* met:
	10	*
	11	* 1.Redistributions of source code must retain the above copyright notice,
	12	* this list of conditions and the following disclaimer.
	13	* 2.Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3.The name of the author may not be used to endorse or promote products
	17	* derived from this software without specific prior written permission.
	18	*
	19	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	20	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	21	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	22	* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
	23	* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	24	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	25	* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	26	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	27	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	28	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	29	* POSSIBILITY OF SUCH DAMAGE.
212380e3 AC	30	*/
	31
	32	#include "stdinc.h"
212380e3 AC	33	#include "class.h"
212380e3 AC	34	#include "client.h"
4562c604	35	#include "match.h"
212380e3 AC	36	#include "ircd.h"
	37	#include "numeric.h"
	38	#include "msg.h"
	39	#include "parse.h"
	40	#include "modules.h"
	41	#include "s_serv.h"
	42	#include "s_user.h"
77d3d2db	43	#include "send.h"
bbce62d2	44	#include "s_conf.h"
dafbd7fa	45	#include "hash.h"
212380e3	46
eeabf33a EM	47	static const char cap_desc[] = "Provides the commands used for client capability negotiation";
eeabf33a EM	48
212380e3 AC	49	typedef int (bqcmp)(const void , const void *);
212380e3 AC	50
3c7d6fcc	51	static void m_cap(struct MsgBuf , struct Client , struct Client , int, const char *);
212380e3 AC	52
212380e3 AC	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 };
5544da98	59
5544da98	60	DECLARE_MODULE_AV2(cap, NULL, NULL, cap_clist, NULL, NULL, NULL, NULL, cap_desc);
212380e3	61
32df5e96 AC	62	#define IsCapableEntry(c, e) IsCapable(c, 1 << (e)->value)
32df5e96 AC	63	#define HasCapabilityFlag(c, f) (c->ownerdata != NULL && (((struct ClientCapability *)c->ownerdata)->flags & (f)) == f)
212380e3	64
193d4db3	65	static inline int
38ffccf8	66	clicap_visible(struct Client client_p, const struct CapabilityEntry cap)
193d4db3 AC	67	{
	68	struct ClientCapability *clicap;
	69
455d2750 AC	70	/* orphaned caps shouldn't be visible */
	71	if (cap->flags & CAP_ORPHANED)
	72	return 0;
	73
193d4db3 AC	74	if (cap->ownerdata == NULL)
	75	return 1;
	76
	77	clicap = cap->ownerdata;
	78	if (clicap->visible == NULL)
	79	return 1;
	80
38ffccf8	81	return clicap->visible(client_p);
193d4db3 AC	82	}
193d4db3 AC	83
212380e3 AC	84	/* clicap_find()
	85	* Used iteratively over a buffer, extracts individual cap tokens.
	86	*
	87	* Inputs: buffer to start iterating over (NULL to iterate over existing buf)
	88	* int pointer to whether the cap token is negated
	89	* int pointer to whether we finish with success
	90	* Ouputs: Cap entry if found, NULL otherwise.
	91	*/
32df5e96	92	static struct CapabilityEntry *
212380e3 AC	93	clicap_find(const char data, int negate, int *finished)
	94	{
	95	static char buf[BUFSIZE];
	96	static char *p;
32df5e96	97	struct CapabilityEntry *cap;
212380e3 AC	98	char *s;
	99
	100	*negate = 0;
	101
	102	if(data)
	103	{
f427c8b0	104	rb_strlcpy(buf, data, sizeof(buf));
212380e3 AC	105	p = buf;
	106	}
	107
	108	if(*finished)
	109	return NULL;
	110
	111	/* skip any whitespace */
	112	while(p && IsSpace(p))
	113	p++;
	114
	115	if(EmptyString(p))
	116	{
	117	*finished = 1;
	118	return NULL;
	119	}
	120
	121	if(*p == '-')
	122	{
	123	*negate = 1;
	124	p++;
	125
	126	/* someone sent a '-' without a parameter.. */
	127	if(*p == '\0')
	128	return NULL;
	129	}
	130
	131	if((s = strchr(p, ' ')))
	132	*s++ = '\0';
	133
32df5e96	134	if((cap = capability_find(cli_capindex, p)) != NULL)
212380e3 AC	135	{
	136	if(s)
	137	p = s;
	138	else
	139	*finished = 1;
	140	}
	141
	142	return cap;
	143	}
	144
	145	/* clicap_generate()
	146	* Generates a list of capabilities.
	147	*
	148	* Inputs: client to send to, subcmd to send,
ceabbbbf	149	* flags to match against: 0 to do none, -1 if client has no flags
212380e3 AC	150	* Outputs: None
	151	*/
	152	static void
ceabbbbf	153	clicap_generate(struct Client source_p, const char subcmd, int flags)
212380e3	154	{
6b23b98a AC	155	char buf[BUFSIZE] = { 0 };
6b23b98a AC	156	char capbuf[BUFSIZE] = { 0 };
212380e3	157	int buflen = 0;
e23126c8	158	int mlen;
32df5e96	159	struct CapabilityEntry *entry;
4177311e	160	rb_dictionary_iter iter;
212380e3	161
ccb75e91	162	mlen = snprintf(buf, sizeof buf, ":%s CAP %s %s",
55abcbb2 KB	163	me.name,
55abcbb2 KB	164	EmptyString(source_p->name) ? "*" : source_p->name,
212380e3 AC	165	subcmd);
212380e3 AC	166
212380e3 AC	167	/* shortcut, nothing to do */
	168	if(flags == -1)
	169	{
	170	sendto_one(source_p, "%s :", buf);
	171	return;
	172	}
	173
56f84ded	174	RB_DICTIONARY_FOREACH(entry, &iter, cli_capindex->cap_dict)
212380e3	175	{
ddf62b10 AC	176	size_t caplen = 0;
	177	struct ClientCapability *clicap = entry->ownerdata;
	178	const char *data = NULL;
	179
ceabbbbf MU	180	if(flags && !IsCapableEntry(source_p, entry))
ceabbbbf MU	181	continue;
212380e3	182
38ffccf8	183	if (!clicap_visible(source_p, entry))
193d4db3	184	continue;
bbce62d2	185
ddf62b10 AC	186	caplen = strlen(entry->cap);
ddf62b10 AC	187	if (!flags && (source_p->flags & FLAGS_CLICAP_DATA) && clicap != NULL && clicap->data != NULL)
38ffccf8	188	data = clicap->data(source_p);
ddf62b10 AC	189
	190	if (data != NULL)
	191	caplen += strlen(data) + 1;
	192
212380e3	193	/* \r\n\0, possible "-~=", space, " " /
ccb75e91	194	if(buflen + mlen >= BUFSIZE - 10)
212380e3 AC	195	{
	196	/* remove our trailing space -- if buflen == mlen
	197	* here, we didnt even succeed in adding one.
	198	*/
ccb75e91	199	capbuf[buflen] = '\0';
212380e3 AC	200
212380e3 AC	201	sendto_one(source_p, "%s * :%s", buf, capbuf);
6b23b98a	202
212380e3	203	buflen = mlen;
6b23b98a	204	memset(capbuf, 0, sizeof capbuf);
212380e3 AC	205	}
212380e3 AC	206
ceabbbbf MU	207	buflen = rb_snprintf_append(capbuf, sizeof capbuf, "%s%s%s ",
ceabbbbf MU	208	entry->cap, data != NULL ? "=" : "", data != NULL ? data : "");
212380e3 AC	209	}
	210
	211	/* remove trailing space */
ccb75e91	212	capbuf[buflen] = '\0';
212380e3 AC	213
	214	sendto_one(source_p, "%s :%s", buf, capbuf);
	215	}
	216
	217	static void
	218	cap_ack(struct Client source_p, const char arg)
	219	{
32df5e96	220	struct CapabilityEntry *cap;
212380e3 AC	221	int capadd = 0, capdel = 0;
	222	int finished = 0, negate;
	223
	224	if(EmptyString(arg))
	225	return;
	226
	227	for(cap = clicap_find(arg, &negate, &finished); cap;
	228	cap = clicap_find(NULL, &negate, &finished))
	229	{
	230	/* sent an ACK for something they havent REQd */
32df5e96	231	if(!IsCapableEntry(source_p, cap))
212380e3 AC	232	continue;
	233
	234	if(negate)
	235	{
	236	/* dont let them ack something sticky off */
32df5e96	237	if(HasCapabilityFlag(cap, CLICAP_FLAGS_STICKY))
212380e3 AC	238	continue;
212380e3 AC	239
32df5e96	240	capdel \|= (1 << cap->value);
212380e3 AC	241	}
212380e3 AC	242	else
32df5e96	243	capadd \|= (1 << cap->value);
212380e3 AC	244	}
	245
	246	source_p->localClient->caps \|= capadd;
	247	source_p->localClient->caps &= ~capdel;
	248	}
	249
212380e3 AC	250	static void
	251	cap_end(struct Client source_p, const char arg)
	252	{
	253	if(IsRegistered(source_p))
	254	return;
	255
095328a7	256	source_p->flags &= ~FLAGS_CLICAP;
212380e3	257
1fb3b1e1	258	if(source_p->name[0] && source_p->flags & FLAGS_SENTUSER)
212380e3	259	{
21251822	260	register_local_user(source_p, source_p);
212380e3 AC	261	}
	262	}
	263
	264	static void
	265	cap_list(struct Client source_p, const char arg)
	266	{
	267	/* list of what theyre currently using */
	268	clicap_generate(source_p, "LIST",
ceabbbbf	269	source_p->localClient->caps ? source_p->localClient->caps : -1);
212380e3 AC	270	}
	271
	272	static void
	273	cap_ls(struct Client source_p, const char arg)
	274	{
	275	if(!IsRegistered(source_p))
095328a7	276	source_p->flags \|= FLAGS_CLICAP;
212380e3	277
ddf62b10	278	if (arg != NULL && !strcmp(arg, "302"))
ba316ed5	279	{
ddf62b10	280	source_p->flags \|= FLAGS_CLICAP_DATA;
ba316ed5 AC	281	source_p->localClient->caps \|= CLICAP_CAP_NOTIFY;
ba316ed5 AC	282	}
ddf62b10	283
212380e3	284	/* list of what we support */
ceabbbbf	285	clicap_generate(source_p, "LS", 0);
212380e3 AC	286	}
	287
	288	static void
	289	cap_req(struct Client source_p, const char arg)
	290	{
	291	char buf[BUFSIZE];
	292	char pbuf[2][BUFSIZE];
32df5e96	293	struct CapabilityEntry *cap;
212380e3 AC	294	int buflen, plen;
	295	int i = 0;
	296	int capadd = 0, capdel = 0;
	297	int finished = 0, negate;
	298
	299	if(!IsRegistered(source_p))
095328a7	300	source_p->flags \|= FLAGS_CLICAP;
212380e3 AC	301
	302	if(EmptyString(arg))
	303	return;
	304
5203cba5	305	buflen = snprintf(buf, sizeof(buf), ":%s CAP %s ACK",
212380e3 AC	306	me.name, EmptyString(source_p->name) ? "*" : source_p->name);
	307
	308	pbuf[0][0] = '\0';
	309	plen = 0;
	310
	311	for(cap = clicap_find(arg, &negate, &finished); cap;
	312	cap = clicap_find(NULL, &negate, &finished))
	313	{
32df5e96 AC	314	size_t namelen = strlen(cap->cap);
32df5e96 AC	315
212380e3 AC	316	/* filled the first array, but cant send it in case the
	317	* request fails. one REQ should never fill more than two
	318	* buffers --fl
	319	*/
32df5e96	320	if(buflen + plen + namelen + 6 >= BUFSIZE)
212380e3 AC	321	{
	322	pbuf[1][0] = '\0';
	323	plen = 0;
	324	i = 1;
	325	}
	326
	327	if(negate)
	328	{
32df5e96	329	if(HasCapabilityFlag(cap, CLICAP_FLAGS_STICKY))
212380e3 AC	330	{
	331	finished = 0;
	332	break;
	333	}
	334
	335	strcat(pbuf[i], "-");
	336	plen++;
	337
32df5e96	338	capdel \|= (1 << cap->value);
212380e3 AC	339	}
	340	else
	341	{
38ffccf8	342	if (!clicap_visible(source_p, cap))
bbce62d2	343	{
193d4db3 AC	344	finished = 0;
193d4db3 AC	345	break;
bbce62d2 MT	346	}
bbce62d2 MT	347
32df5e96	348	capadd \|= (1 << cap->value);
212380e3 AC	349	}
212380e3 AC	350
32df5e96 AC	351	/* XXX this probably should exclude REQACK'd caps from capadd/capdel, but keep old behaviour for now */
32df5e96 AC	352	if(HasCapabilityFlag(cap, CLICAP_FLAGS_REQACK))
212380e3 AC	353	{
	354	strcat(pbuf[i], "~");
	355	plen++;
	356	}
	357
32df5e96	358	strcat(pbuf[i], cap->cap);
d855e13e VL	359	if (!finished) {
d855e13e VL	360	strcat(pbuf[i], " ");
32df5e96	361	plen += (namelen + 1);
d855e13e	362	}
212380e3 AC	363	}
	364
	365	if(!finished)
	366	{
	367	sendto_one(source_p, ":%s CAP %s NAK :%s",
	368	me.name, EmptyString(source_p->name) ? "*" : source_p->name, arg);
	369	return;
	370	}
	371
	372	if(i)
	373	{
	374	sendto_one(source_p, "%s * :%s", buf, pbuf[0]);
	375	sendto_one(source_p, "%s :%s", buf, pbuf[1]);
	376	}
	377	else
	378	sendto_one(source_p, "%s :%s", buf, pbuf[0]);
	379
	380	source_p->localClient->caps \|= capadd;
	381	source_p->localClient->caps &= ~capdel;
	382	}
	383
	384	static struct clicap_cmd
	385	{
	386	const char *cmd;
	387	void (func)(struct Client source_p, const char *arg);
	388	} clicap_cmdlist[] = {
	389	/* This list MUST be in alphabetical order */
	390	{ "ACK", cap_ack },
212380e3 AC	391	{ "END", cap_end },
	392	{ "LIST", cap_list },
	393	{ "LS", cap_ls },
	394	{ "REQ", cap_req },
	395	};
	396
	397	static int
	398	clicap_cmd_search(const char command, struct clicap_cmd entry)
	399	{
	400	return irccmp(command, entry->cmd);
	401	}
	402
3c7d6fcc	403	static void
428ca87b	404	m_cap(struct MsgBuf msgbuf_p, struct Client client_p, struct Client source_p, int parc, const char parv[])
212380e3 AC	405	{
	406	struct clicap_cmd *cmd;
	407
	408	if(!(cmd = bsearch(parv[1], clicap_cmdlist,
	409	sizeof(clicap_cmdlist) / sizeof(struct clicap_cmd),
	410	sizeof(struct clicap_cmd), (bqcmp) clicap_cmd_search)))
	411	{
	412	sendto_one(source_p, form_str(ERR_INVALIDCAPCMD),
48a038f4 JT	413	me.name, EmptyString(source_p->name) ? "*" : source_p->name,
48a038f4 JT	414	parv[1]);
3c7d6fcc	415	return;
212380e3 AC	416	}
	417
	418	(cmd->func)(source_p, parv[2]);
212380e3	419	}