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-rw-r--r--src/l4d2vote.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/src/l4d2vote.c b/src/l4d2vote.c
new file mode 100644
index 0000000..06c61b8
--- /dev/null
+++ b/src/l4d2vote.c
@@ -0,0 +1,134 @@
+/*
+ * Copyright © 2023 Willian Henrique <wsimanbrazil@yahoo.com.br>
+ *
+ * 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 "con_.h"
+#include "engineapi.h"
+#include "ent.h"
+#include "errmsg.h"
+#include "feature.h"
+#include "gamedata.h"
+#include "gametype.h"
+#include "intdefs.h"
+#include "mem.h"
+#include "x86.h"
+#include "x86util.h"
+
+FEATURE("Left 4 Dead 2 vote cooldown resetting")
+REQUIRE_GAMEDATA(vtidx_Spawn)
+
+static void **votecontroller = 0;
+static int off_callerrecords = 0;
+
+// Note: the vote callers vector contains these as elements. We don't currently
+// do anything with the structure, but keeping it here for reference.
+/*struct CallerRecord {
+ u32 steamid_trunc;
+ float last_time;
+ int votes_passed;
+ int votes_failed;
+ int last_issueidx;
+ bool last_passed;
+};*/
+
+DEF_CCMD_HERE_UNREG(sst_l4d2_vote_cooldown_reset,
+ "Reset vote cooldown for all players", CON_CHEAT) {
+ if (!*votecontroller) {
+ con_warn("vote controller not initialised\n");
+ return;
+ }
+ // Basically equivalent to CUtlVector::RemoveAll. The elements don't need
+ // to be destructed. This state is equivalent to when no one has voted yet
+ struct CUtlVector *recordvector = mem_offset(*votecontroller,
+ off_callerrecords);
+ recordvector->sz = 0;
+}
+
+PREINIT {
+ // note: L4D1 has sv_vote_creation_timer but it doesn't actually do anything
+ return GAMETYPE_MATCHES(L4D2) && !!con_findvar("sv_vote_creation_timer");
+}
+
+static inline bool find_votecontroller(con_cmdcbv1 listissues_cb) {
+ const uchar *insns = (const uchar *)listissues_cb;
+#ifdef _WIN32
+ // The "listissues" command calls CVoteController::ListIssues, loading
+ // g_voteController into ECX
+ for (const uchar *p = insns; p - insns < 32;) {
+ if (p[0] == X86_MOVRMW && p[1] == X86_MODRM(0, 1, 5)) {
+ votecontroller = mem_loadptr(p + 2);
+ return true;
+ }
+ NEXT_INSN(p, "g_voteController variable");
+ }
+#else
+#warning TODO(linux): this will be different
+#endif
+ return false;
+}
+
+// This finds the caller record vector using a pointer to the
+// CVoteController::Spawn function
+static inline bool find_votecallers(void *votectrlspawn) {
+ const uchar *insns = (const uchar *)votectrlspawn;
+ for (const uchar *p = insns; p - insns < 64;) {
+ // Unsure what the member on this offset actually is (the game seems to
+ // want it to be set to 0 to allow votes to happen), but the vector we
+ // want seems to consistently be 8 bytes after whatever this is
+ // "mov dword ptr [<reg> + off], 0", mod == 0b11
+ if (p[0] == X86_MOVMIW && (p[1] & 0xC0) == 0x80 &&
+ mem_load32(p + 6) == 0) {
+ off_callerrecords = mem_load32(p + 2) + 8;
+ return true;
+ }
+ NEXT_INSN(p, "vote caller record vector");
+ }
+ return false;
+}
+
+INIT {
+ struct con_cmd *cmd_listissues = con_findcmd("listissues");
+ if (!cmd_listissues) {
+ errmsg_errorx("couldn't find \"listissues\" command");
+ return false;
+ }
+ con_cmdcbv1 listissues_cb = con_getcmdcbv1(cmd_listissues);
+ if (!find_votecontroller(listissues_cb)) {
+ errmsg_errorx("couldn't find vote controller instance");
+ return false;
+ }
+
+ // g_voteController may have not been initialized yet so we get the vtable
+ // from the ent factory
+ const struct CEntityFactory *factory = ent_getfactory("vote_controller");
+ if (!factory) {
+ errmsg_errorx("couldn't find vote controller entity factory");
+ return false;
+ }
+ void **vtable = ent_findvtable(factory, "CVoteController");
+ if (!vtable) {
+ errmsg_errorx("couldn't find CVoteController vtable");
+ return false;
+ }
+ if (!find_votecallers(vtable[vtidx_Spawn])) {
+ errmsg_errorx("couldn't find vote callers vector offset");
+ return false;
+ }
+
+ con_reg(sst_l4d2_vote_cooldown_reset);
+ return true;
+}
+
+// vi: sw=4 ts=4 noet tw=80 cc=80