X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fm_spanningtree%2Fsvsnick.cpp;h=b3a612ca350f9b53108ac9c213812ace9070066b;hb=8320bcc9df1ea89a47257c9f9c70aa6d476beaa8;hp=1caf679271a231cbc52a259c2d4466cc041374f2;hpb=f4cd5fb72ad191a3708d3d39a4fc74cc1ae4377e;p=user%2Fhenk%2Fcode%2Finspircd.git

diff --git a/src/modules/m_spanningtree/svsnick.cpp b/src/modules/m_spanningtree/svsnick.cpp
index 1caf67927..b3a612ca3 100644
--- a/src/modules/m_spanningtree/svsnick.cpp
+++ b/src/modules/m_spanningtree/svsnick.cpp
@@ -21,30 +21,50 @@
 #include "inspircd.h"
 
 #include "main.h"
-#include "utils.h"
 #include "commands.h"
 
-CmdResult CommandSVSNick::Handle(const std::vector<std::string>& parameters, User *user)
+CmdResult CommandSVSNick::Handle(User* user, std::vector<std::string>& parameters)
 {
 	User* u = ServerInstance->FindNick(parameters[0]);
 
 	if (u && IS_LOCAL(u))
 	{
+		// The 4th parameter is optional and it is the expected nick TS of the target user. If this parameter is
+		// present and it doesn't match the user's nick TS, the SVSNICK is not acted upon.
+		// This makes it possible to detect the case when services wants to change the nick of a user, but the
+		// user changes their nick before the SVSNICK arrives, making the SVSNICK nick change (usually to a guest nick)
+		// unnecessary. Consider the following for example:
+		//
+		// 1. test changes nick to Attila which is protected by services
+		// 2. Services SVSNICKs the user to Guest12345
+		// 3. Attila changes nick to Attila_ which isn't protected by services
+		// 4. SVSNICK arrives
+		// 5. Attila_ gets his nick changed to Guest12345 unnecessarily
+		//
+		// In this case when the SVSNICK is processed the target has already changed his nick to something
+		// which isn't protected, so changing the nick again to a Guest nick is not desired.
+		// However, if the expected nick TS parameter is present in the SVSNICK then the nick change in step 5
+		// won't happen because the timestamps won't match.
+		if (parameters.size() > 3)
+		{
+			time_t ExpectedTS = ConvToInt(parameters[3]);
+			if (u->age != ExpectedTS)
+				return CMD_FAILURE; // Ignore SVSNICK
+		}
+
 		std::string nick = parameters[1];
 		if (isdigit(nick[0]))
 			nick = u->uuid;
 
-		if (!u->ForceNickChange(nick.c_str()))
+		time_t NickTS = ConvToInt(parameters[2]);
+		if (NickTS <= 0)
+			return CMD_FAILURE;
+
+		if (!u->ChangeNick(nick, NickTS))
 		{
-			/* buh. UID them */
-			if (!u->ForceNickChange(u->uuid.c_str()))
-			{
-				ServerInstance->Users->QuitUser(u, "Nickname collision");
-				return CMD_SUCCESS;
-			}
+			// Changing to 'nick' failed (it may already be in use), change to the uuid
+			u->ChangeNick(u->uuid);
 		}
-
-		u->age = ConvToInt(parameters[2]);
 	}
 
 	return CMD_SUCCESS;