[solanum.git] / modules / m_who.c

/*
 *  ircd-ratbox: A slightly useful ircd.
 *  m_who.c: Shows who is on a channel.
 *
 *  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
 *
 *  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
 *
 *  $Id: m_who.c 3350 2007-04-02 22:03:08Z jilles $
 */
#include "stdinc.h"
#include "common.h"
#include "client.h"
#include "channel.h"
#include "hash.h"
#include "ircd.h"
#include "numeric.h"
#include "s_serv.h"
#include "send.h"
#include "match.h"
#include "s_conf.h"
#include "logger.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
#include "packet.h"
#include "s_newconf.h"
#include "ratelimit.h"

#define FIELD_CHANNEL    0x0001
#define FIELD_HOP        0x0002
#define FIELD_FLAGS      0x0004
#define FIELD_HOST       0x0008
#define FIELD_IP         0x0010
#define FIELD_IDLE       0x0020
#define FIELD_NICK       0x0040
#define FIELD_INFO       0x0080
#define FIELD_SERVER     0x0100
#define FIELD_QUERYTYPE  0x0200 /* cookie for client */
#define FIELD_USER       0x0400
#define FIELD_ACCOUNT    0x0800
#define FIELD_OPLEVEL    0x1000 /* meaningless and stupid, but whatever */

struct who_format
{
	int fields;
	const char *querytype;
};

static int m_who(struct Client *, struct Client *, int, const char **);

struct Message who_msgtab = {
	"WHO", 0, 0, 0, MFLG_SLOW,
	{mg_unreg, {m_who, 2}, mg_ignore, mg_ignore, mg_ignore, {m_who, 2}}
};

mapi_clist_av1 who_clist[] = { &who_msgtab, NULL };
DECLARE_MODULE_AV1(who, NULL, NULL, who_clist, NULL, NULL, "$Revision: 3350 $");

static void do_who_on_channel(struct Client *source_p, struct Channel *chptr,
			      int server_oper, int member,
			      struct who_format *fmt);

static void who_global(struct Client *source_p, const char *mask, int server_oper, int operspy, struct who_format *fmt);

static void do_who(struct Client *source_p,
		   struct Client *target_p, struct membership *msptr,
		   struct who_format *fmt);


/*
** m_who
**      parv[1] = nickname mask list
**      parv[2] = additional selection flag and format options
*/
static int
m_who(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
	static time_t last_used = 0;
	struct Client *target_p;
	struct membership *msptr;
	char *mask;
	rb_dlink_node *lp;
	struct Channel *chptr = NULL;
	int server_oper = parc > 2 ? (*parv[2] == 'o') : 0;	/* Show OPERS only */
	int member;
	int operspy = 0;
	struct who_format fmt;
	const char *s;
	char maskcopy[512];

	fmt.fields = 0;
	fmt.querytype = NULL;
	if (parc > 2 && (s = strchr(parv[2], '%')) != NULL)
	{
		s++;
		for (; *s != '\0'; s++)
		{
			switch (*s)
			{
				case 'c': fmt.fields |= FIELD_CHANNEL; break;
				case 'd': fmt.fields |= FIELD_HOP; break;
				case 'f': fmt.fields |= FIELD_FLAGS; break;
				case 'h': fmt.fields |= FIELD_HOST; break;
				case 'i': fmt.fields |= FIELD_IP; break;
				case 'l': fmt.fields |= FIELD_IDLE; break;
				case 'n': fmt.fields |= FIELD_NICK; break;
				case 'r': fmt.fields |= FIELD_INFO; break;
				case 's': fmt.fields |= FIELD_SERVER; break;
				case 't': fmt.fields |= FIELD_QUERYTYPE; break;
				case 'u': fmt.fields |= FIELD_USER; break;
				case 'a': fmt.fields |= FIELD_ACCOUNT; break;
				case 'o': fmt.fields |= FIELD_OPLEVEL; break;
				case ',':
					  s++;
					  fmt.querytype = s;
					  s += strlen(s);
					  s--;
					  break;
			}
		}
		if (EmptyString(fmt.querytype) || strlen(fmt.querytype) > 3)
			fmt.querytype = "0";
	}

	rb_strlcpy(maskcopy, parv[1], sizeof maskcopy);
	mask = maskcopy;

	collapse(mask);

	/* '/who *' */
	if((*(mask + 1) == '\0') && (*mask == '*'))
	{
		if(source_p->user == NULL)
			return 0;

		if((lp = source_p->user->channel.head) != NULL)
		{
			msptr = lp->data;
			do_who_on_channel(source_p, msptr->chptr, server_oper, YES, &fmt);
		}

		sendto_one(source_p, form_str(RPL_ENDOFWHO),
			   me.name, source_p->name, "*");
		return 0;
	}

	if(IsOperSpy(source_p) && *mask == '!')
	{
		mask++;
		operspy = 1;

		if(EmptyString(mask))
		{
			sendto_one(source_p, form_str(RPL_ENDOFWHO),
					me.name, source_p->name, parv[1]);
			return 0;
		}
	}

	/* '/who #some_channel' */
	if(IsChannelName(mask))
	{
		/* List all users on a given channel */
		chptr = find_channel(parv[1] + operspy);

		if(chptr != NULL)
		{
			if (!IsOper(source_p) && !ratelimit_client_who(source_p, rb_dlink_list_length(&chptr->members)/50))
			{
				sendto_one(source_p, form_str(RPL_LOAD2HI),
						me.name, source_p->name, "WHO");
				sendto_one(source_p, form_str(RPL_ENDOFWHO),
					   me.name, source_p->name, "*");
				return 0;
			}

			if(operspy)
				report_operspy(source_p, "WHO", chptr->chname);

			if(IsMember(source_p, chptr) || operspy)
				do_who_on_channel(source_p, chptr, server_oper, YES, &fmt);
			else if(!SecretChannel(chptr))
				do_who_on_channel(source_p, chptr, server_oper, NO, &fmt);
		}

		sendto_one(source_p, form_str(RPL_ENDOFWHO),
			   me.name, source_p->name, parv[1] + operspy);
		return 0;
	}

	/* '/who nick' */

	if(((target_p = find_named_person(mask)) != NULL) &&
	   (!server_oper || IsOper(target_p)))
	{
		int isinvis = 0;

		isinvis = IsInvisible(target_p);
		RB_DLINK_FOREACH(lp, target_p->user->channel.head)
		{
			msptr = lp->data;
			chptr = msptr->chptr;

			member = IsMember(source_p, chptr);

			if(isinvis && !member)
				continue;

			if(member || (!isinvis && PubChannel(chptr)))
				break;
		}

		/* if we stopped midlist, lp->data is the membership for
		 * target_p of chptr
		 */
		if(lp != NULL)
			do_who(source_p, target_p, lp->data, &fmt);
		else
			do_who(source_p, target_p, NULL, &fmt);

		sendto_one(source_p, form_str(RPL_ENDOFWHO), 
			   me.name, source_p->name, mask);
		return 0;
	}

	if(!IsFloodDone(source_p))
		flood_endgrace(source_p);

	/* it has to be a global who at this point, limit it */
	if(!IsOper(source_p))
	{
		if((last_used + ConfigFileEntry.pace_wait) > rb_current_time() || !ratelimit_client(source_p, 1))
		{
			sendto_one(source_p, form_str(RPL_LOAD2HI),
					me.name, source_p->name, "WHO");
			sendto_one(source_p, form_str(RPL_ENDOFWHO),
				   me.name, source_p->name, "*");
			return 0;
		}
		else
			last_used = rb_current_time();
	}

	/* Note: operspy_dont_care_user_info does not apply to
	 * who on channels */
	if(IsOperSpy(source_p) && ConfigFileEntry.operspy_dont_care_user_info)
		operspy = 1;

	/* '/who 0' for a global list.  this forces clients to actually
	 * request a full list.  I presume its because of too many typos
	 * with "/who" ;) --fl
	 */
	if((*(mask + 1) == '\0') && (*mask == '0'))
		who_global(source_p, NULL, server_oper, 0, &fmt);
	else
		who_global(source_p, mask, server_oper, operspy, &fmt);

	sendto_one(source_p, form_str(RPL_ENDOFWHO),
		   me.name, source_p->name, mask);

	return 0;
}

/* who_common_channel
 * inputs	- pointer to client requesting who
 * 		- pointer to channel member chain.
 *		- char * mask to match
 *		- int if oper on a server or not
 *		- pointer to int maxmatches
 *		- format options
 * output	- NONE
 * side effects - lists matching invisible clients on specified channel,
 * 		  marks matched clients.
 */
static void
who_common_channel(struct Client *source_p, struct Channel *chptr,
		   const char *mask, int server_oper, int *maxmatches,
		   struct who_format *fmt)
{
	struct membership *msptr;
	struct Client *target_p;
	rb_dlink_node *ptr;

	RB_DLINK_FOREACH(ptr, chptr->members.head)
	{
		msptr = ptr->data;
		target_p = msptr->client_p;

		if(!IsInvisible(target_p) || IsMarked(target_p))
			continue;

		if(server_oper && !IsOper(target_p))
			continue;

		SetMark(target_p);

		if(*maxmatches > 0)
		{
			if((mask == NULL) ||
					match(mask, target_p->name) || match(mask, target_p->username) ||
					match(mask, target_p->host) || match(mask, target_p->servptr->name) ||
					(IsOper(source_p) && match(mask, target_p->orighost)) ||
					match(mask, target_p->info))
			{
				do_who(source_p, target_p, NULL, fmt);
				--(*maxmatches);
			}
		}
	}
}

/*
 * who_global
 *
 * inputs	- pointer to client requesting who
 *		- char * mask to match
 *		- int if oper on a server or not
 *		- int if operspy or not
 *		- format options
 * output	- NONE
 * side effects - do a global scan of all clients looking for match
 *		  this is slightly expensive on EFnet ...
 *		  marks assumed cleared for all clients initially
 *		  and will be left cleared on return
 */
static void
who_global(struct Client *source_p, const char *mask, int server_oper, int operspy, struct who_format *fmt)
{
	struct membership *msptr;
	struct Client *target_p;
	rb_dlink_node *lp, *ptr;
	int maxmatches = 500;

	/* first, list all matching INvisible clients on common channels
	 * if this is not an operspy who
	 */
	if(!operspy)
	{
		RB_DLINK_FOREACH(lp, source_p->user->channel.head)
		{
			msptr = lp->data;
			who_common_channel(source_p, msptr->chptr, mask, server_oper, &maxmatches, fmt);
		}
	}
	else if (!ConfigFileEntry.operspy_dont_care_user_info)
		report_operspy(source_p, "WHO", mask);

	/* second, list all matching visible clients and clear all marks
	 * on invisible clients
	 * if this is an operspy who, list all matching clients, no need
	 * to clear marks
	 */
	RB_DLINK_FOREACH(ptr, global_client_list.head)
	{
		target_p = ptr->data;
		if(!IsPerson(target_p))
			continue;

		if(IsInvisible(target_p) && !operspy)
		{
			ClearMark(target_p);
			continue;
		}

		if(server_oper && !IsOper(target_p))
			continue;

		if(maxmatches > 0)
		{
			if(!mask ||
					match(mask, target_p->name) || match(mask, target_p->username) ||
					match(mask, target_p->host) || match(mask, target_p->servptr->name) ||
					(IsOper(source_p) && match(mask, target_p->orighost)) ||
					match(mask, target_p->info))
			{
				do_who(source_p, target_p, NULL, fmt);
				--maxmatches;
			}
		}
	}

	if (maxmatches <= 0)
		sendto_one(source_p,
			form_str(ERR_TOOMANYMATCHES),
			me.name, source_p->name, "WHO");
}

/*
 * do_who_on_channel
 *
 * inputs	- pointer to client requesting who
 *		- pointer to channel to do who on
 *		- The "real name" of this channel
 *		- int if source_p is a server oper or not
 *		- int if client is member or not
 *		- format options
 * output	- NONE
 * side effects - do a who on given channel
 */
static void
do_who_on_channel(struct Client *source_p, struct Channel *chptr,
		  int server_oper, int member, struct who_format *fmt)
{
	struct Client *target_p;
	struct membership *msptr;
	rb_dlink_node *ptr;

	RB_DLINK_FOREACH(ptr, chptr->members.head)
	{
		msptr = ptr->data;
		target_p = msptr->client_p;

		if(server_oper && !IsOper(target_p))
			continue;

		if(member || !IsInvisible(target_p))
			do_who(source_p, target_p, msptr, fmt);
	}
}

/*
 * append_format
 *
 * inputs	- pointer to buffer
 *		- size of buffer
 *		- pointer to position
 *		- format string
 *		- arguments for format
 * output	- NONE
 * side effects - position incremented, possibly beyond size of buffer
 *		  this allows detecting overflow
 */
static void
append_format(char *buf, size_t bufsize, size_t *pos, const char *fmt, ...)
{
	size_t max, result;
	va_list ap;

	max = *pos >= bufsize ? 0 : bufsize - *pos;
	va_start(ap, fmt);
	result = rb_vsnprintf(buf + *pos, max, fmt, ap);
	va_end(ap);
	*pos += result;
}

/*
 * do_who
 *
 * inputs	- pointer to client requesting who
 *		- pointer to client to do who on
 *		- channel membership or NULL
 *		- format options
 * output	- NONE
 * side effects - do a who on given person
 */

static void
do_who(struct Client *source_p, struct Client *target_p, struct membership *msptr, struct who_format *fmt)
{
	char status[16];
	char str[510 + 1]; /* linebuf.c will add \r\n */
	size_t pos;
	const char *q;

	rb_sprintf(status, "%c%s%s",
		   target_p->user->away ? 'G' : 'H', IsOper(target_p) ? "*" : "", msptr ? find_channel_status(msptr, fmt->fields || IsCapable(source_p, CLICAP_MULTI_PREFIX)) : "");

	if (fmt->fields == 0)
		sendto_one(source_p, form_str(RPL_WHOREPLY), me.name,
			   source_p->name, msptr ? msptr->chptr->chname : "*",
			   target_p->username, target_p->host,
			   target_p->servptr->name, target_p->name, status,
			   ConfigServerHide.flatten_links && !IsOper(source_p) && !IsExemptShide(source_p) ? 0 : target_p->hopcount, 
			   target_p->info);
	else
	{
		str[0] = '\0';
		pos = 0;
		append_format(str, sizeof str, &pos, ":%s %d %s",
				me.name, RPL_WHOSPCRPL, source_p->name);
		if (fmt->fields & FIELD_QUERYTYPE)
			append_format(str, sizeof str, &pos, " %s", fmt->querytype);
		if (fmt->fields & FIELD_CHANNEL)
			append_format(str, sizeof str, &pos, " %s", msptr ? msptr->chptr->chname : "*");
		if (fmt->fields & FIELD_USER)
			append_format(str, sizeof str, &pos, " %s", target_p->username);
		if (fmt->fields & FIELD_IP)
		{
			if (show_ip(source_p, target_p) && !EmptyString(target_p->sockhost) && strcmp(target_p->sockhost, "0"))
				append_format(str, sizeof str, &pos, " %s", target_p->sockhost);
			else
				append_format(str, sizeof str, &pos, " %s", "255.255.255.255");
		}
		if (fmt->fields & FIELD_HOST)
			append_format(str, sizeof str, &pos, " %s", target_p->host);
		if (fmt->fields & FIELD_SERVER)
			append_format(str, sizeof str, &pos, " %s", target_p->servptr->name);
		if (fmt->fields & FIELD_NICK)
			append_format(str, sizeof str, &pos, " %s", target_p->name);
		if (fmt->fields & FIELD_FLAGS)
			append_format(str, sizeof str, &pos, " %s", status);
		if (fmt->fields & FIELD_HOP)
			append_format(str, sizeof str, &pos, " %d", ConfigServerHide.flatten_links && !IsOper(source_p) && !IsExemptShide(source_p) ? 0 : target_p->hopcount);
		if (fmt->fields & FIELD_IDLE)
			append_format(str, sizeof str, &pos, " %d", (int)(MyClient(target_p) ? rb_current_time() - target_p->localClient->last : 0));
		if (fmt->fields & FIELD_ACCOUNT)
		{
			/* display as in whois */
			q = target_p->user->suser;
			if (!EmptyString(q))
			{
				while(IsDigit(*q))
					q++;
				if(*q == '\0')
					q = target_p->user->suser;
			}
			else
				q = "0";
			append_format(str, sizeof str, &pos, " %s", q);
		}
		if (fmt->fields & FIELD_OPLEVEL)
			append_format(str, sizeof str, &pos, " %s", is_chanop(msptr) ? "999" : "n/a");
		if (fmt->fields & FIELD_INFO)
			append_format(str, sizeof str, &pos, " :%s", target_p->info);

		if (pos >= sizeof str)
		{
			static int warned = 0;
			if (!warned)
				sendto_realops_snomask(SNO_DEBUG, L_NETWIDE,
						"WHOX overflow while sending information about %s to %s",
						target_p->name, source_p->name);
			warned = 1;
		}
		sendto_one(source_p, "%s", str);
	}
}
Commit	Line	Data
212380e3 AC	1	/*
	2	* ircd-ratbox: A slightly useful ircd.
	3	* m_who.c: Shows who is on a channel.
	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
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
	22	* USA
	23	*
f71e18ee	24	* $Id: m_who.c 3350 2007-04-02 22:03:08Z jilles $
212380e3 AC	25	*/
212380e3 AC	26	#include "stdinc.h"
212380e3 AC	27	#include "common.h"
	28	#include "client.h"
	29	#include "channel.h"
	30	#include "hash.h"
	31	#include "ircd.h"
	32	#include "numeric.h"
	33	#include "s_serv.h"
	34	#include "send.h"
4562c604	35	#include "match.h"
212380e3	36	#include "s_conf.h"
4016731b	37	#include "logger.h"
212380e3 AC	38	#include "msg.h"
	39	#include "parse.h"
	40	#include "modules.h"
	41	#include "packet.h"
	42	#include "s_newconf.h"
7e132ff0	43	#include "ratelimit.h"
212380e3	44
48957a49 JT	45	#define FIELD_CHANNEL 0x0001
	46	#define FIELD_HOP 0x0002
	47	#define FIELD_FLAGS 0x0004
	48	#define FIELD_HOST 0x0008
	49	#define FIELD_IP 0x0010
	50	#define FIELD_IDLE 0x0020
	51	#define FIELD_NICK 0x0040
	52	#define FIELD_INFO 0x0080
	53	#define FIELD_SERVER 0x0100
	54	#define FIELD_QUERYTYPE 0x0200 /* cookie for client */
	55	#define FIELD_USER 0x0400
	56	#define FIELD_ACCOUNT 0x0800
	57	#define FIELD_OPLEVEL 0x1000 /* meaningless and stupid, but whatever */
	58
	59	struct who_format
	60	{
	61	int fields;
	62	const char *querytype;
	63	};
	64
212380e3 AC	65	static int m_who(struct Client , struct Client , int, const char **);
	66
	67	struct Message who_msgtab = {
	68	"WHO", 0, 0, 0, MFLG_SLOW,
	69	{mg_unreg, {m_who, 2}, mg_ignore, mg_ignore, mg_ignore, {m_who, 2}}
	70	};
	71
	72	mapi_clist_av1 who_clist[] = { &who_msgtab, NULL };
f71e18ee	73	DECLARE_MODULE_AV1(who, NULL, NULL, who_clist, NULL, NULL, "$Revision: 3350 $");
212380e3 AC	74
212380e3 AC	75	static void do_who_on_channel(struct Client source_p, struct Channel chptr,
48957a49 JT	76	int server_oper, int member,
48957a49 JT	77	struct who_format *fmt);
212380e3	78
48957a49	79	static void who_global(struct Client source_p, const char mask, int server_oper, int operspy, struct who_format *fmt);
212380e3 AC	80
212380e3 AC	81	static void do_who(struct Client *source_p,
02eca3f1 JT	82	struct Client target_p, struct membership msptr,
02eca3f1 JT	83	struct who_format *fmt);
212380e3 AC	84
	85
	86	/*
	87	** m_who
212380e3	88	** parv[1] = nickname mask list
48957a49	89	** parv[2] = additional selection flag and format options
212380e3 AC	90	*/
	91	static int
	92	m_who(struct Client client_p, struct Client source_p, int parc, const char *parv[])
	93	{
	94	static time_t last_used = 0;
	95	struct Client *target_p;
	96	struct membership *msptr;
	97	char *mask;
5b96d9a6	98	rb_dlink_node *lp;
212380e3 AC	99	struct Channel *chptr = NULL;
	100	int server_oper = parc > 2 ? (parv[2] == 'o') : 0; / Show OPERS only */
	101	int member;
	102	int operspy = 0;
48957a49 JT	103	struct who_format fmt;
48957a49 JT	104	const char *s;
04d77684	105	char maskcopy[512];
48957a49 JT	106
	107	fmt.fields = 0;
	108	fmt.querytype = NULL;
	109	if (parc > 2 && (s = strchr(parv[2], '%')) != NULL)
	110	{
	111	s++;
	112	for (; *s != '\0'; s++)
	113	{
	114	switch (*s)
	115	{
	116	case 'c': fmt.fields \|= FIELD_CHANNEL; break;
	117	case 'd': fmt.fields \|= FIELD_HOP; break;
	118	case 'f': fmt.fields \|= FIELD_FLAGS; break;
	119	case 'h': fmt.fields \|= FIELD_HOST; break;
	120	case 'i': fmt.fields \|= FIELD_IP; break;
	121	case 'l': fmt.fields \|= FIELD_IDLE; break;
	122	case 'n': fmt.fields \|= FIELD_NICK; break;
	123	case 'r': fmt.fields \|= FIELD_INFO; break;
	124	case 's': fmt.fields \|= FIELD_SERVER; break;
	125	case 't': fmt.fields \|= FIELD_QUERYTYPE; break;
	126	case 'u': fmt.fields \|= FIELD_USER; break;
	127	case 'a': fmt.fields \|= FIELD_ACCOUNT; break;
	128	case 'o': fmt.fields \|= FIELD_OPLEVEL; break;
	129	case ',':
	130	s++;
	131	fmt.querytype = s;
	132	s += strlen(s);
	133	s--;
	134	break;
	135	}
	136	}
	137	if (EmptyString(fmt.querytype) \|\| strlen(fmt.querytype) > 3)
	138	fmt.querytype = "0";
	139	}
212380e3	140
62656efd	141	rb_strlcpy(maskcopy, parv[1], sizeof maskcopy);
04d77684	142	mask = maskcopy;
212380e3 AC	143
	144	collapse(mask);
	145
	146	/* '/who ' /
	147	if(((mask + 1) == '\0') && (mask == '*'))
	148	{
	149	if(source_p->user == NULL)
	150	return 0;
	151
	152	if((lp = source_p->user->channel.head) != NULL)
	153	{
	154	msptr = lp->data;
48957a49	155	do_who_on_channel(source_p, msptr->chptr, server_oper, YES, &fmt);
212380e3 AC	156	}
	157
	158	sendto_one(source_p, form_str(RPL_ENDOFWHO),
	159	me.name, source_p->name, "*");
	160	return 0;
	161	}
	162
	163	if(IsOperSpy(source_p) && *mask == '!')
	164	{
	165	mask++;
	166	operspy = 1;
	167
	168	if(EmptyString(mask))
	169	{
	170	sendto_one(source_p, form_str(RPL_ENDOFWHO),
	171	me.name, source_p->name, parv[1]);
	172	return 0;
	173	}
	174	}
	175
	176	/* '/who #some_channel' */
	177	if(IsChannelName(mask))
	178	{
	179	/* List all users on a given channel */
f71e18ee	180	chptr = find_channel(parv[1] + operspy);
7e132ff0	181
212380e3 AC	182	if(chptr != NULL)
212380e3 AC	183	{
7e132ff0 KB	184	if (!IsOper(source_p) && !ratelimit_client_who(source_p, rb_dlink_list_length(&chptr->members)/50))
	185	{
	186	sendto_one(source_p, form_str(RPL_LOAD2HI),
	187	me.name, source_p->name, "WHO");
	188	sendto_one(source_p, form_str(RPL_ENDOFWHO),
	189	me.name, source_p->name, "*");
	190	return 0;
	191	}
	192
212380e3 AC	193	if(operspy)
	194	report_operspy(source_p, "WHO", chptr->chname);
	195
	196	if(IsMember(source_p, chptr) \|\| operspy)
48957a49	197	do_who_on_channel(source_p, chptr, server_oper, YES, &fmt);
212380e3	198	else if(!SecretChannel(chptr))
48957a49	199	do_who_on_channel(source_p, chptr, server_oper, NO, &fmt);
212380e3	200	}
7e132ff0	201
212380e3	202	sendto_one(source_p, form_str(RPL_ENDOFWHO),
f71e18ee	203	me.name, source_p->name, parv[1] + operspy);
212380e3 AC	204	return 0;
	205	}
	206
	207	/* '/who nick' */
	208
	209	if(((target_p = find_named_person(mask)) != NULL) &&
	210	(!server_oper \|\| IsOper(target_p)))
	211	{
	212	int isinvis = 0;
	213
	214	isinvis = IsInvisible(target_p);
5b96d9a6	215	RB_DLINK_FOREACH(lp, target_p->user->channel.head)
212380e3 AC	216	{
	217	msptr = lp->data;
	218	chptr = msptr->chptr;
	219
	220	member = IsMember(source_p, chptr);
	221
	222	if(isinvis && !member)
	223	continue;
	224
	225	if(member \|\| (!isinvis && PubChannel(chptr)))
	226	break;
	227	}
	228
	229	/* if we stopped midlist, lp->data is the membership for
	230	* target_p of chptr
	231	*/
	232	if(lp != NULL)
02eca3f1	233	do_who(source_p, target_p, lp->data, &fmt);
212380e3	234	else
02eca3f1	235	do_who(source_p, target_p, NULL, &fmt);
212380e3 AC	236
	237	sendto_one(source_p, form_str(RPL_ENDOFWHO),
	238	me.name, source_p->name, mask);
	239	return 0;
	240	}
	241
	242	if(!IsFloodDone(source_p))
	243	flood_endgrace(source_p);
	244
	245	/* it has to be a global who at this point, limit it */
	246	if(!IsOper(source_p))
	247	{
7e132ff0	248	if((last_used + ConfigFileEntry.pace_wait) > rb_current_time() \|\| !ratelimit_client(source_p, 1))
212380e3 AC	249	{
	250	sendto_one(source_p, form_str(RPL_LOAD2HI),
	251	me.name, source_p->name, "WHO");
	252	sendto_one(source_p, form_str(RPL_ENDOFWHO),
	253	me.name, source_p->name, "*");
	254	return 0;
	255	}
	256	else
e3354945	257	last_used = rb_current_time();
212380e3 AC	258	}
	259
	260	/* Note: operspy_dont_care_user_info does not apply to
	261	* who on channels */
	262	if(IsOperSpy(source_p) && ConfigFileEntry.operspy_dont_care_user_info)
	263	operspy = 1;
	264
	265	/* '/who 0' for a global list. this forces clients to actually
	266	* request a full list. I presume its because of too many typos
	267	* with "/who" ;) --fl
	268	*/
	269	if(((mask + 1) == '\0') && (mask == '0'))
48957a49	270	who_global(source_p, NULL, server_oper, 0, &fmt);
212380e3	271	else
48957a49	272	who_global(source_p, mask, server_oper, operspy, &fmt);
212380e3 AC	273
	274	sendto_one(source_p, form_str(RPL_ENDOFWHO),
	275	me.name, source_p->name, mask);
	276
	277	return 0;
	278	}
	279
	280	/* who_common_channel
	281	* inputs - pointer to client requesting who
	282	* - pointer to channel member chain.
	283	* - char * mask to match
	284	* - int if oper on a server or not
	285	* - pointer to int maxmatches
48957a49	286	* - format options
212380e3 AC	287	* output - NONE
	288	* side effects - lists matching invisible clients on specified channel,
	289	* marks matched clients.
	290	*/
	291	static void
	292	who_common_channel(struct Client source_p, struct Channel chptr,
48957a49 JT	293	const char mask, int server_oper, int maxmatches,
48957a49 JT	294	struct who_format *fmt)
212380e3 AC	295	{
	296	struct membership *msptr;
	297	struct Client *target_p;
5b96d9a6	298	rb_dlink_node *ptr;
212380e3	299
5b96d9a6	300	RB_DLINK_FOREACH(ptr, chptr->members.head)
212380e3 AC	301	{
	302	msptr = ptr->data;
	303	target_p = msptr->client_p;
	304
	305	if(!IsInvisible(target_p) \|\| IsMarked(target_p))
	306	continue;
	307
	308	if(server_oper && !IsOper(target_p))
	309	continue;
	310
	311	SetMark(target_p);
	312
	313	if(*maxmatches > 0)
	314	{
	315	if((mask == NULL) \|\|
	316	match(mask, target_p->name) \|\| match(mask, target_p->username) \|\|
c88cdb00	317	match(mask, target_p->host) \|\| match(mask, target_p->servptr->name) \|\|
212380e3 AC	318	(IsOper(source_p) && match(mask, target_p->orighost)) \|\|
	319	match(mask, target_p->info))
	320	{
02eca3f1	321	do_who(source_p, target_p, NULL, fmt);
212380e3 AC	322	--(*maxmatches);
	323	}
	324	}
	325	}
	326	}
	327
	328	/*
	329	* who_global
	330	*
	331	* inputs - pointer to client requesting who
	332	* - char * mask to match
	333	* - int if oper on a server or not
48957a49 JT	334	* - int if operspy or not
48957a49 JT	335	* - format options
212380e3 AC	336	* output - NONE
	337	* side effects - do a global scan of all clients looking for match
	338	* this is slightly expensive on EFnet ...
	339	* marks assumed cleared for all clients initially
	340	* and will be left cleared on return
	341	*/
	342	static void
48957a49	343	who_global(struct Client source_p, const char mask, int server_oper, int operspy, struct who_format *fmt)
212380e3 AC	344	{
	345	struct membership *msptr;
	346	struct Client *target_p;
5b96d9a6	347	rb_dlink_node lp, ptr;
212380e3 AC	348	int maxmatches = 500;
	349
	350	/* first, list all matching INvisible clients on common channels
	351	* if this is not an operspy who
	352	*/
	353	if(!operspy)
	354	{
5b96d9a6	355	RB_DLINK_FOREACH(lp, source_p->user->channel.head)
212380e3 AC	356	{
212380e3 AC	357	msptr = lp->data;
48957a49	358	who_common_channel(source_p, msptr->chptr, mask, server_oper, &maxmatches, fmt);
212380e3 AC	359	}
	360	}
	361	else if (!ConfigFileEntry.operspy_dont_care_user_info)
	362	report_operspy(source_p, "WHO", mask);
	363
	364	/* second, list all matching visible clients and clear all marks
	365	* on invisible clients
	366	* if this is an operspy who, list all matching clients, no need
	367	* to clear marks
	368	*/
5b96d9a6	369	RB_DLINK_FOREACH(ptr, global_client_list.head)
212380e3 AC	370	{
	371	target_p = ptr->data;
	372	if(!IsPerson(target_p))
	373	continue;
	374
	375	if(IsInvisible(target_p) && !operspy)
	376	{
	377	ClearMark(target_p);
	378	continue;
	379	}
	380
	381	if(server_oper && !IsOper(target_p))
	382	continue;
	383
	384	if(maxmatches > 0)
	385	{
	386	if(!mask \|\|
	387	match(mask, target_p->name) \|\| match(mask, target_p->username) \|\|
c88cdb00	388	match(mask, target_p->host) \|\| match(mask, target_p->servptr->name) \|\|
212380e3 AC	389	(IsOper(source_p) && match(mask, target_p->orighost)) \|\|
	390	match(mask, target_p->info))
	391	{
02eca3f1	392	do_who(source_p, target_p, NULL, fmt);
212380e3 AC	393	--maxmatches;
	394	}
	395	}
	396	}
	397
	398	if (maxmatches <= 0)
	399	sendto_one(source_p,
	400	form_str(ERR_TOOMANYMATCHES),
	401	me.name, source_p->name, "WHO");
	402	}
	403
	404	/*
	405	* do_who_on_channel
	406	*
	407	* inputs - pointer to client requesting who
	408	* - pointer to channel to do who on
	409	* - The "real name" of this channel
	410	* - int if source_p is a server oper or not
	411	* - int if client is member or not
48957a49	412	* - format options
212380e3 AC	413	* output - NONE
	414	* side effects - do a who on given channel
	415	*/
	416	static void
	417	do_who_on_channel(struct Client source_p, struct Channel chptr,
48957a49	418	int server_oper, int member, struct who_format *fmt)
212380e3 AC	419	{
	420	struct Client *target_p;
	421	struct membership *msptr;
5b96d9a6	422	rb_dlink_node *ptr;
212380e3	423
5b96d9a6	424	RB_DLINK_FOREACH(ptr, chptr->members.head)
212380e3 AC	425	{
	426	msptr = ptr->data;
	427	target_p = msptr->client_p;
	428
	429	if(server_oper && !IsOper(target_p))
	430	continue;
	431
	432	if(member \|\| !IsInvisible(target_p))
02eca3f1	433	do_who(source_p, target_p, msptr, fmt);
212380e3 AC	434	}
	435	}
	436
bac250f6 JT	437	/*
	438	* append_format
	439	*
	440	* inputs - pointer to buffer
	441	* - size of buffer
	442	* - pointer to position
	443	* - format string
	444	* - arguments for format
	445	* output - NONE
	446	* side effects - position incremented, possibly beyond size of buffer
	447	* this allows detecting overflow
	448	*/
	449	static void
	450	append_format(char buf, size_t bufsize, size_t pos, const char *fmt, ...)
	451	{
	452	size_t max, result;
	453	va_list ap;
	454
	455	max = pos >= bufsize ? 0 : bufsize - pos;
	456	va_start(ap, fmt);
94734aac	457	result = rb_vsnprintf(buf + *pos, max, fmt, ap);
bac250f6 JT	458	va_end(ap);
	459	*pos += result;
	460	}
	461
212380e3 AC	462	/*
	463	* do_who
	464	*
	465	* inputs - pointer to client requesting who
	466	* - pointer to client to do who on
02eca3f1	467	* - channel membership or NULL
48957a49	468	* - format options
212380e3 AC	469	* output - NONE
	470	* side effects - do a who on given person
	471	*/
	472
	473	static void
02eca3f1	474	do_who(struct Client source_p, struct Client target_p, struct membership msptr, struct who_format fmt)
212380e3	475	{
ea6dade2	476	char status[16];
bac250f6 JT	477	char str[510 + 1]; /* linebuf.c will add \r\n */
bac250f6 JT	478	size_t pos;
48957a49	479	const char *q;
212380e3	480
7cdb0a09	481	rb_sprintf(status, "%c%s%s",
c127b45b	482	target_p->user->away ? 'G' : 'H', IsOper(target_p) ? "*" : "", msptr ? find_channel_status(msptr, fmt->fields \|\| IsCapable(source_p, CLICAP_MULTI_PREFIX)) : "");
212380e3	483
48957a49 JT	484	if (fmt->fields == 0)
48957a49 JT	485	sendto_one(source_p, form_str(RPL_WHOREPLY), me.name,
02eca3f1	486	source_p->name, msptr ? msptr->chptr->chname : "*",
48957a49 JT	487	target_p->username, target_p->host,
48957a49 JT	488	target_p->servptr->name, target_p->name, status,
9a7ab95b	489	ConfigServerHide.flatten_links && !IsOper(source_p) && !IsExemptShide(source_p) ? 0 : target_p->hopcount,
48957a49 JT	490	target_p->info);
	491	else
	492	{
	493	str[0] = '\0';
bac250f6 JT	494	pos = 0;
	495	append_format(str, sizeof str, &pos, ":%s %d %s",
	496	me.name, RPL_WHOSPCRPL, source_p->name);
48957a49	497	if (fmt->fields & FIELD_QUERYTYPE)
bac250f6	498	append_format(str, sizeof str, &pos, " %s", fmt->querytype);
48957a49	499	if (fmt->fields & FIELD_CHANNEL)
bac250f6	500	append_format(str, sizeof str, &pos, " %s", msptr ? msptr->chptr->chname : "*");
48957a49	501	if (fmt->fields & FIELD_USER)
bac250f6	502	append_format(str, sizeof str, &pos, " %s", target_p->username);
48957a49 JT	503	if (fmt->fields & FIELD_IP)
	504	{
	505	if (show_ip(source_p, target_p) && !EmptyString(target_p->sockhost) && strcmp(target_p->sockhost, "0"))
bac250f6	506	append_format(str, sizeof str, &pos, " %s", target_p->sockhost);
48957a49	507	else
bac250f6	508	append_format(str, sizeof str, &pos, " %s", "255.255.255.255");
48957a49 JT	509	}
48957a49 JT	510	if (fmt->fields & FIELD_HOST)
bac250f6	511	append_format(str, sizeof str, &pos, " %s", target_p->host);
48957a49	512	if (fmt->fields & FIELD_SERVER)
bac250f6	513	append_format(str, sizeof str, &pos, " %s", target_p->servptr->name);
48957a49	514	if (fmt->fields & FIELD_NICK)
bac250f6	515	append_format(str, sizeof str, &pos, " %s", target_p->name);
48957a49	516	if (fmt->fields & FIELD_FLAGS)
bac250f6	517	append_format(str, sizeof str, &pos, " %s", status);
48957a49	518	if (fmt->fields & FIELD_HOP)
9a7ab95b	519	append_format(str, sizeof str, &pos, " %d", ConfigServerHide.flatten_links && !IsOper(source_p) && !IsExemptShide(source_p) ? 0 : target_p->hopcount);
48957a49	520	if (fmt->fields & FIELD_IDLE)
bac250f6	521	append_format(str, sizeof str, &pos, " %d", (int)(MyClient(target_p) ? rb_current_time() - target_p->localClient->last : 0));
48957a49 JT	522	if (fmt->fields & FIELD_ACCOUNT)
	523	{
	524	/* display as in whois */
	525	q = target_p->user->suser;
	526	if (!EmptyString(q))
	527	{
	528	while(IsDigit(*q))
	529	q++;
	530	if(*q == '\0')
	531	q = target_p->user->suser;
	532	}
	533	else
	534	q = "0";
bac250f6	535	append_format(str, sizeof str, &pos, " %s", q);
48957a49 JT	536	}
48957a49 JT	537	if (fmt->fields & FIELD_OPLEVEL)
bac250f6	538	append_format(str, sizeof str, &pos, " %s", is_chanop(msptr) ? "999" : "n/a");
48957a49	539	if (fmt->fields & FIELD_INFO)
bac250f6 JT	540	append_format(str, sizeof str, &pos, " :%s", target_p->info);
	541
	542	if (pos >= sizeof str)
	543	{
	544	static int warned = 0;
	545	if (!warned)
	546	sendto_realops_snomask(SNO_DEBUG, L_NETWIDE,
	547	"WHOX overflow while sending information about %s to %s",
	548	target_p->name, source_p->name);
	549	warned = 1;
	550	}
	551	sendto_one(source_p, "%s", str);
48957a49	552	}
212380e3	553	}