From 1ef5d409355f433e2b067f0f7dd57ec9382e701a Mon Sep 17 00:00:00 2001
From: irungentoo <irungentoo@gmail.com>
Date: Sun, 16 Feb 2014 07:25:10 -0500
Subject: Possibly fixed the issue that group chats would sometimes DOS
 themselves.

---
 toxcore/group_chats.c | 27 ++++++++++++++++++++++++++-
 toxcore/group_chats.h |  3 +++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/toxcore/group_chats.c b/toxcore/group_chats.c
index 6dff52ef..e686ee5d 100644
--- a/toxcore/group_chats.c
+++ b/toxcore/group_chats.c
@@ -250,6 +250,22 @@ static int addpeer(Group_Chat *chat, uint8_t *client_id)
     return (chat->numpeers - 1);
 }
 
+/*
+ * Set a peer from the group chat to deleted.
+ *
+ * return 0 if success
+ * return -1 if error.
+ */
+static int del_peer_set(Group_Chat *chat, int peernum)
+{
+    if ((uint32_t)peernum >= chat->numpeers)
+        return -1;
+
+    chat->group[peernum].deleted = 1;
+    chat->group[peernum].deleted_time = unix_time();
+    return 0;
+}
+
 /*
  * Delete a peer from the group chat.
  *
@@ -488,6 +504,9 @@ static int handle_data(Group_Chat *chat, uint8_t *data, uint32_t len)
     if (peernum == -1)
         return 1;
 
+    if (chat->group[peernum].deleted)
+        return 1;
+
     /* Spam prevention (1 message per peer per second limit.)
 
         if (chat->group[peernum].last_recv == temp_time)
@@ -531,7 +550,7 @@ static int handle_data(Group_Chat *chat, uint8_t *data, uint32_t len)
             if (contents_len != 0)
                 return 1;
 
-            delpeer(chat, peernum);
+            del_peer_set(chat, peernum);
             break;
 
         case GROUP_CHAT_PEER_NICK:
@@ -758,6 +777,7 @@ static void ping_group(Group_Chat *chat)
     }
 }
 
+#define DEL_PEER_DELAY 3
 static void del_dead_peers(Group_Chat *chat)
 {
     uint32_t i;
@@ -766,6 +786,11 @@ static void del_dead_peers(Group_Chat *chat)
         if (is_timeout(chat->group[i].last_recv_msgping, GROUP_PING_INTERVAL * 4)) {
             delpeer(chat, i);
         }
+
+        if (chat->group[i].deleted) {
+            if (is_timeout(chat->group[i].deleted_time, DEL_PEER_DELAY))
+                delpeer(chat, i);
+        }
     }
 }
 
diff --git a/toxcore/group_chats.h b/toxcore/group_chats.h
index 8d5f5e50..e31aa229 100644
--- a/toxcore/group_chats.h
+++ b/toxcore/group_chats.h
@@ -41,6 +41,9 @@ typedef struct {
 
     uint8_t     nick[MAX_NICK_BYTES];
     uint16_t    nick_len;
+
+    uint8_t     deleted;
+    uint64_t    deleted_time;
 } Group_Peer;
 
 typedef struct {
-- 
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