From 95c1abdfcb62211557fdd14b463a014e87882a2d Mon Sep 17 00:00:00 2001
From: epoque11 <epoque11@54d463be-8e91-2dee-dedb-b68131a5f0ec>
Date: Wed, 14 Dec 2011 00:37:17 +0000
Subject: - Fixed floating shops being accessible from any location through 3rd
 party programs - TODO: needs amending for the walking glitch (bugreport:5016)

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@15099 54d463be-8e91-2dee-dedb-b68131a5f0ec
---
 src/map/clif.c   | 3 +++
 src/map/npc.c    | 9 ++++++++-
 src/map/pc.h     | 1 +
 src/map/script.c | 3 +++
 4 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/map/clif.c b/src/map/clif.c
index eab61ca4e..26de41816 100644
--- a/src/map/clif.c
+++ b/src/map/clif.c
@@ -8671,6 +8671,9 @@ void clif_parse_LoadEndAck(int fd,struct map_session_data *sd)
 		instance_check_idle(map[sd->bl.m].instance_id);
 	}
 	sd->state.debug_remove_map = 0; // temporary state to track double remove_map's [FlavioJS]
+	
+	// reset the callshop flag if the player changes map
+	sd->state.callshop = 0;
 
 	map_addblock(&sd->bl);
 	clif_spawn(&sd->bl);
diff --git a/src/map/npc.c b/src/map/npc.c
index 3eb92dcf6..3a8ea376f 100644
--- a/src/map/npc.c
+++ b/src/map/npc.c
@@ -1174,8 +1174,15 @@ int npc_buysellsel(struct map_session_data* sd, int id, int type)
 	}
 	if (nd->sc.option&OPTION_INVISIBLE)	// 無効化されている
 		return 1;
+	if( nd->class_ < 0 && !sd->state.callshop )
+	{// not called through a script and is not a visible NPC so an invalid call
+		return 1;
+	}
+
+	// reset the callshop state for future calls
+	sd->state.callshop = 0;
+	sd->npc_shopid = id;
 
-	sd->npc_shopid=id;
 	if (type==0) {
 		clif_buylist(sd,nd);
 	} else {
diff --git a/src/map/pc.h b/src/map/pc.h
index 16c31e69c..39e38bc34 100644
--- a/src/map/pc.h
+++ b/src/map/pc.h
@@ -135,6 +135,7 @@ struct map_session_data {
 		unsigned int vending : 1;
 		unsigned int noks : 3; // [Zeph Kill Steal Protection]
 		unsigned int changemap : 1;
+		unsigned int callshop : 1; // flag to indicate that a script used callshop; on a shop
 		short pmap; // Previous map on Map Change
 		unsigned short autoloot;
 		unsigned short autolootid; // [Zephyrus]
diff --git a/src/map/script.c b/src/map/script.c
index ea8e26c23..88380af29 100644
--- a/src/map/script.c
+++ b/src/map/script.c
@@ -13816,6 +13816,9 @@ BUILDIN_FUNC(callshop)
 	
 	if( nd->subtype == SHOP )
 	{
+		// flag the user as using a valid script call for opening the shop (for floating NPCs)
+		sd->state.callshop = 1;
+
 		switch( flag )
 		{
 			case 1: npc_buysellsel(sd,nd->bl.id,0); break; //Buy window
-- 
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