Unhide useful commands and allow cheats in lobbies

This is done through a new "fixes" file which will probably become one
of those silly dumping grounds that every project has to have somewhere
to put random miscellaneous crap in.

These are mainly hidden in L4D2 but they just get unilaterally unhidden
if they exist, just to be sure they're accessible.

As a bonus, it turns out that unhiding a single cvar also allows us to
set sv_cheats 1 in Left 4 Dead 2, bringing an end to the need to port-
forward a listen server for co-op practice.

4 files changed, 84 insertions, 1 deletions

diff --git a/src/con_.h b/src/con_.h
index 4c662fe..f6ef161 100644
--- a/src/con_.h
+++ b/src/con_.h
@@ -144,9 +144,11 @@ struct con_var { // ConVar in engine
 	int minval;
 	bool hasmax; // just sticking to sdk position for now
 	int maxval;
-	//void *cb; we don't currently bother with callback support. add if needed!
+	//void *cb; // we don't currently bother with callback support. add if needed!
 };
 
+/* The change callback used in most branches of Source. Takes an IConVar :) */
+typedef void (*con_varcb)(void *v, const char *, float);
 
 /*
  * These functions get and set the values of console variables in a
diff --git a/src/fixes.c b/src/fixes.c
new file mode 100644
index 0000000..fbab083
--- /dev/null
+++ b/src/fixes.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright © 2021 Michael Smith <mikesmiffy128@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "con_.h"
+
+static void unhide(const char *name) {
+	struct con_var *v = con_findvar(name);
+	if (v) v->parent->base.flags &= ~(CON_DEVONLY | CON_HIDDEN);
+}
+
+void fixes_apply(void) {
+	// expose all the demo stuff, for games like L4D that hide it for some
+	// reason.
+	unhide("demo_debug");
+	unhide("demo_fastforwardfinalspeed");
+	unhide("demo_fastforwardramptime");
+	unhide("demo_fastforwardstartspeed");
+	unhide("demo_gototick");
+	unhide("demo_interplimit");
+	unhide("demo_legacy_rollback");
+	unhide("demo_pauseatservertick");
+	unhide("demo_quitafterplayback");
+
+	unhide("director_afk_timeout");
+	unhide("mp_restartgame");
+
+	// handy console stuff
+	unhide("con_filter_enable");
+	unhide("con_filter_text");
+	unhide("con_filter_text_out");
+
+	// also, let people just do this lol. why not
+	unhide("developer");
+
+	// L4D2 doesn't let you set sv_cheats in lobbies, but turns out it skips all
+	// the lobby checks if this random command is developer-only, presumably
+	// because that flag is compiled out in debug builds and devs want to be
+	// able to use cheats. Took literally hours of staring at Ghidra to find
+	// this out. Good meme 8/10.
+	unhide("sv_hosting_lobby");
+}
+
+// vi: sw=4 ts=4 noet tw=80 cc=80
diff --git a/src/fixes.h b/src/fixes.h
new file mode 100644
index 0000000..6795b4c
--- /dev/null
+++ b/src/fixes.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright © 2021 Michael Smith <mikesmiffy128@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* Makes a best-effort attempt to fix up random annoyances in some games. */
+void fixes_apply(void);
+
+// vi: sw=4 ts=4 noet tw=80 cc=80
diff --git a/src/sst.c b/src/sst.c
index dbee4b7..6c60cf3 100644
--- a/src/sst.c
+++ b/src/sst.c
@@ -19,6 +19,7 @@
 #include "con_.h"
 #include "demorec.h"
 #include "factory.h"
+#include "fixes.h"
 #include "gamedata.h"
 #include "gameinfo.h"
 #include "gametype.h"
@@ -108,6 +109,7 @@ static bool do_load(ifacefactory enginef, ifacefactory serverf) {
 nc:	gamedata_init();
 	// TODO(autojump): we'd init that here
 	has_demorec = demorec_init();
+	fixes_apply();
 
 	con_colourmsg(RGBA(64, 255, 64, 255),
 			NAME " v" VERSION " successfully loaded");