From 7a9a9000b75088830651490b5945a00458977cf1 Mon Sep 17 00:00:00 2001
From: Jilles Tjoelker <jilles@stack.nl>
Date: Fri, 13 Sep 2013 22:29:26 +0200
Subject: [PATCH] Enable remote WHOWAS queries.

On ircd-seven, this will allow remote opers to see certain hidden IPs.
---
 doc/technical/ts6-protocol.txt |  9 +++++++++
 help/opers/whowas              |  4 +++-
 modules/m_whowas.c             | 13 ++++++++-----
 3 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/doc/technical/ts6-protocol.txt b/doc/technical/ts6-protocol.txt
index 8c90e182..df253420 100644
--- a/doc/technical/ts6-protocol.txt
+++ b/doc/technical/ts6-protocol.txt
@@ -1058,6 +1058,15 @@ parameters: hunted, target nick
 
 Remote WHOIS request.
 
+WHOWAS
+source: user
+parameters: nickname, limit, hunted
+
+Remote WHOWAS request. Not implemented in all servers.
+
+Different from a local WHOWAS request, the limit is mandatory and servers should
+apply a maximum to it.
+
 XLINE
 1.
 encap only
diff --git a/help/opers/whowas b/help/opers/whowas
index 0f3023c0..b277942f 100644
--- a/help/opers/whowas
+++ b/help/opers/whowas
@@ -1,4 +1,4 @@
-WHOWAS <nick> [limit]
+WHOWAS <nick> [limit] [server|nick]
 
 WHOWAS will show you the last known host and whois
 information for the specified nick.  Depending on the
@@ -8,4 +8,6 @@ may be more than one listing for a specific user.
 If a limit is specified, WHOWAS will not show more
 than that many listings.
 
+The third parameter allows querying another server.
+
 The WHOWAS data will expire after time.
diff --git a/modules/m_whowas.c b/modules/m_whowas.c
index eb32ede2..c0f10b66 100644
--- a/modules/m_whowas.c
+++ b/modules/m_whowas.c
@@ -45,7 +45,7 @@ static int m_whowas(struct Client *, struct Client *, int, const char **);
 
 struct Message whowas_msgtab = {
 	"WHOWAS", 0, 0, 0, MFLG_SLOW,
-	{mg_unreg, {m_whowas, 2}, mg_ignore, mg_ignore, mg_ignore, {m_whowas, 2}}
+	{mg_unreg, {m_whowas, 2}, {m_whowas, 4}, mg_ignore, mg_ignore, {m_whowas, 2}}
 };
 
 mapi_clist_av1 whowas_clist[] = { &whowas_msgtab, NULL };
@@ -68,9 +68,11 @@ m_whowas(struct Client *client_p, struct Client *source_p, int parc, const char
 
 	static time_t last_used = 0L;
 
-	if(!IsOper(source_p))
+	if(MyClient(source_p) && !IsOper(source_p))
 	{
-		if((last_used + ConfigFileEntry.pace_wait_simple) > rb_current_time())
+		if(last_used + (parc > 3 ? ConfigFileEntry.pace_wait :
+						ConfigFileEntry.pace_wait_simple
+				) > rb_current_time())
 		{
 			sendto_one(source_p, form_str(RPL_LOAD2HI),
 				   me.name, source_p->name, "WHOWAS");
@@ -86,11 +88,12 @@ m_whowas(struct Client *client_p, struct Client *source_p, int parc, const char
 	if(parc > 2)
 		max = atoi(parv[2]);
 
-#if 0
 	if(parc > 3)
 		if(hunt_server(client_p, source_p, ":%s WHOWAS %s %s :%s", 3, parc, parv))
 			return 0;
-#endif
+
+	if(!MyClient(source_p) && (max <= 0 || max > 20))
+		max = 20;
 
 	if((p = strchr(parv[1], ',')))
 		*p = '\0';