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-rw-r--r--src/demorec.c333
1 files changed, 188 insertions, 145 deletions
diff --git a/src/demorec.c b/src/demorec.c
index a384e55..5d17452 100644
--- a/src/demorec.c
+++ b/src/demorec.c
@@ -24,6 +24,7 @@
#include "hook.h"
#include "factory.h"
#include "gamedata.h"
+#include "gameinfo.h"
#include "intdefs.h"
#include "mem.h"
#include "os.h"
@@ -31,112 +32,101 @@
#include "vcall.h"
#include "x86.h"
-#define SIGNONSTATE_SPAWN 5 // ready to receive entity packets
-#define SIGNONSTATE_FULL 6 // fully connected, first non-delta packet received
-
-typedef void (*VCALLCONV f_StopRecording)(void *);
-typedef void (*VCALLCONV f_SetSignonState)(void *, int);
+DEF_CVAR(sst_autorecord, "Continue recording demos after server disconnects", 1,
+ CON_ARCHIVE | CON_HIDDEN)
static void *demorecorder;
-static struct con_cmd *cmd_stop;
-static bool *recording;
static int *demonum;
-static f_SetSignonState orig_SetSignonState;
-static f_StopRecording orig_StopRecording;
-static con_cmdcb orig_stop_callback;
-static int nbits_msgtype;
-static int nbits_datalen;
+static bool *recording;
+static bool wantstop = false;
-static int auto_demonum = 1;
-static bool auto_recording = false;
+#define SIGNONSTATE_NEW 3
+#define SIGNONSTATE_SPAWN 5
+#define SIGNONSTATE_FULL 6
-DEF_CVAR(sst_autorecord, "Continue recording demos through map changes", 1,
- CON_ARCHIVE | CON_HIDDEN)
+typedef void (*VCALLCONV SetSignonState_func)(void *, int);
+static SetSignonState_func orig_SetSignonState;
+static void VCALLCONV hook_SetSignonState(void *this_, int state) {
+ struct CDemoRecorder *this = this_;
+ // apparently NEW only *sometimes* bumps the demo num - prevent this!
+ if (state == SIGNONSTATE_NEW) {
+ int oldnum = *demonum;
+ orig_SetSignonState(this, state);
+ *demonum = oldnum;
+ return;
+ }
+ // SPAWN always fires once every load, so use that to bump demonum instead
+ if (state == SIGNONSTATE_SPAWN) ++*demonum;
+ // dumb hack: game actually creates the demo file on FULL. we set demonum to
+ // 0 in the record command hook so that it gets incremented to 1 on SPAWN.
+ // if it's still 0 here, bump it up to 1 real quick!
+ else if (state == SIGNONSTATE_FULL && *demonum == 0) *demonum = 1;
+ orig_SetSignonState(this, state);
+}
+typedef void (*VCALLCONV StopRecording_func)(void *);
+static StopRecording_func orig_StopRecording;
static void VCALLCONV hook_StopRecording(void *this) {
- // This hook will get called twice per loaded save (in most games/versions,
- // at least, according to SAR people): first with m_bLoadgame set to false
- // and then with it set to true. This will set m_nDemoNumber to 0 and
- // m_bRecording to false
+ // This can be called any number of times in a row, generally twice per load
+ // and once per explicit disconnect. Each time the engine sets demonum to 0
+ // and recording to false.
+ bool wasrecording = *recording;
+ int lastnum = *demonum;
orig_StopRecording(this);
-
- if (auto_recording && con_getvari(sst_autorecord)) {
- *demonum = auto_demonum;
+ // If the user didn't specifically request the stop, tell the engine to
+ // start recording again as soon as it can.
+ if (wasrecording && !wantstop && con_getvari(sst_autorecord)) {
*recording = true;
- }
- else {
- auto_demonum = 1;
- auto_recording = false;
+ *demonum = lastnum;
}
}
-static void VCALLCONV hook_SetSignonState(void *this, int state) {
- // SIGNONSTATE_FULL *may* happen twice per load, depending on the game, so
- // use SIGNONSTATE_SPAWN for demo number increase
- if (state == SIGNONSTATE_SPAWN && auto_recording) auto_demonum++;
- // Starting a demo recording will call this function with SIGNONSTATE_FULL
- // After a load, the engine's demo recorder will only start recording when
- // it reaches this state, so this is a good time to set the flag if needed
- else if (state == SIGNONSTATE_FULL) {
- // Changing sessions may unset the recording flag (or so says NeKzor),
- // so if we want to be recording, we want to tell the engine to record.
- // But also, if the engine is already recording, we want our state to
- // reflect *that*. IOW, if either thing is set, also set the other one.
- auto_recording |= *recording; *recording = auto_recording;
+static struct con_cmd *cmd_record, *cmd_stop;
+static con_cmdcb orig_record_cb, orig_stop_cb;
- // FIXME: this will override demonum incorrectly if the plugin is
- // loaded while demos are already being recorded
- if (auto_recording) *demonum = auto_demonum;
+static void hook_record_cb(const struct con_cmdargs *args) {
+ bool was = *recording;
+ if (!was && args->argc == 2 || args->argc == 3) {
+ // safety check: make sure a directory exists, otherwise recording
+ // silently fails
+ const char *arg = args->argv[1];
+ const char *lastslash = 0;
+ for (const char *p = arg; *p; ++p) {
+#ifdef _WIN32
+ if (*p == '/' || *p == '\\') lastslash = p;
+#else
+ if (*p == '/') lastslash = p;
+#endif
+ }
+ if (lastslash) {
+ int argdirlen = lastslash - arg;
+ int gdlen = os_strlen(gameinfo_gamedir);
+ if (gdlen + 1 + argdirlen < PATH_MAX) { // if not, too bad
+ os_char dir[PATH_MAX], *q = dir;
+ memcpy(q, gameinfo_gamedir, gdlen * sizeof(gameinfo_gamedir));
+ q += gdlen;
+ *q++ = OS_LIT('/');
+ // ascii->wtf16 (probably turns into memcpy() on linux)
+ for (const char *p = arg; p - arg < argdirlen; ++p, ++q) {
+ *q = (uchar)*p;
+ }
+ q[argdirlen] = OS_LIT('\0');
+ if (os_access(dir, X_OK) == -1) {
+ con_warn("ERROR: can't record demo: subdirectory %.*s "
+ "doesn't exist\n", argdirlen, arg);
+ return;
+ }
+ }
+ }
}
- orig_SetSignonState(this, state);
+ orig_record_cb(args);
+ if (!was && *recording) *demonum = 0; // see SetSignonState comment above
}
-static void hook_stop_callback(const struct con_cmdargs *args) {
- auto_recording = false;
- orig_stop_callback(args);
-}
-
-// The engine allows usermessages up to 255 bytes, we add 2 bytes of overhead,
-// and then there's the leading bits before that too (see create_message)
-static char bb_buf[DEMOREC_CUSTOM_MSG_MAX + 4];
-static struct bitbuf bb = {
- bb_buf, sizeof(bb_buf), sizeof(bb_buf) * 8, 0, false, false, "SST"
-};
-
-static void create_message(struct bitbuf *msg, const void *buf, int len) {
- // The way we pack our custom demo data is via a user message packet with
- // type "HudText" - this causes the client to do a text lookup which will
- // simply silently fail on invalid keys. By making the first byte null
- // (creating an empty string), we get the rest of the packet to stick in
- // whatever other data we want.
- //
- // Notes from Uncrafted:
- // > But yeah the data you want to append is as follows:
- // > - 6 bits (5 bits in older versions) for the message type - should be 23
- // > for user message
- bitbuf_appendbits(msg, 23, nbits_msgtype);
- // > - 1 byte for the user message type - should be 2 for HudText
- bitbuf_appendbyte(msg, 2);
- // > - ~~an int~~ 11 or 12 bits for the length of your data in bits,
- // NOTE: this assumes len <= 254
- bitbuf_appendbits(msg, len * 8, nbits_datalen);
- // > - your data
- // [first the aforementioned null byte, plus an arbitrary marker byte to
- // avoid confusion when parsing the demo later...
- bitbuf_appendbyte(msg, 0);
- bitbuf_appendbyte(msg, 0xAC);
- // ... and then just the data itself]
- bitbuf_appendbuf(msg, buf, len);
- // Thanks Uncrafted, very cool!
-}
-
-typedef void (*VCALLCONV WriteMessages_func)(void *this, struct bitbuf *msg);
-static WriteMessages_func WriteMessages = 0;
-
-void demorec_writecustom(void *buf, int len) {
- create_message(&bb, buf, len);
- WriteMessages(demorecorder, &bb);
- bitbuf_reset(&bb);
+static void hook_stop_cb(const struct con_cmdargs *args) {
+ wantstop = true;
+ orig_stop_cb(args);
+ wantstop = false;
}
// XXX: probably want some general foreach-instruction macro once we start doing
@@ -154,10 +144,9 @@ void demorec_writecustom(void *buf, int len) {
// instance).
static inline bool find_demorecorder(struct con_cmd *cmd_stop) {
#ifdef _WIN32
- uchar *stopcb = (uchar *)con_getcmdcb(cmd_stop);
// The "stop" command calls the virtual function demorecorder.IsRecording(),
// so just look for the load of the "this" pointer into ECX
- for (uchar *p = stopcb; p - stopcb < 32;) {
+ for (uchar *p = (uchar *)orig_stop_cb; p - (uchar *)orig_stop_cb < 32;) {
if (p[0] == X86_MOVRMW && p[1] == X86_MODRM(0, 1, 5)) {
void **indirect = mem_loadptr(p + 2);
demorecorder = *indirect;
@@ -195,50 +184,23 @@ static inline bool find_recmembers(void *stoprecording) {
return false;
}
-// This finds the CDemoRecorder::WriteMessages() function, which takes a raw
-// network packet, wraps it up in the appropriate demo framing format and writes
-// it out to the demo file being recorded.
-static bool find_WriteMessages(void) {
- // TODO(compat): probably rewrite this to just scan for a call instruction!
- const uchar *insns = (*(uchar ***)demorecorder)[gamedata_vtidx_RecordPacket];
- // RecordPacket calls WriteMessages pretty much right away:
- // 56 push esi
- // 57 push edi
- // 8B F1 mov esi,ecx
- // 8D BE lea edi,[esi + 0x68c]
- // 8C 06 00 00
- // 57 push edi
- // E8 call CDemoRecorder_WriteMessages
- // B0 EF FF FF
- // So we just double check the byte pattern...
- static const uchar bytes[] =
-#ifdef _WIN32
- HEXBYTES(56, 57, 8B, F1, 8D, BE, 8C, 06, 00, 00, 57, E8);
-#else
-#warning This is possibly different on Linux too, have a look!
- {-1, -1, -1, -1, -1, -1};
-#endif
- if (!memcmp(insns, bytes, sizeof(bytes))) {
- ssize off = mem_loadoffset(insns + sizeof(bytes));
- // ... and then offset is relative to the address of whatever is _after_
- // the call instruction... because x86.
- WriteMessages = (WriteMessages_func)(insns + sizeof(bytes) + 4 + off);
- return true;
- }
- return false;
-}
-
bool demorec_init(void) {
- if (!gamedata_has_vtidx_SetSignonState ||
- !gamedata_has_vtidx_StopRecording) {
+ if (!gamedata_has_vtidx_StopRecording) {
con_warn("demorec: missing gamedata entries for this engine\n");
return false;
}
+ cmd_record = con_findcmd("record");
+ if (!cmd_record) { // can *this* even happen? I hope not!
+ con_warn("demorec: couldn't find \"record\" command\n");
+ return false;
+ }
+ orig_record_cb = con_getcmdcb(cmd_record);
cmd_stop = con_findcmd("stop");
- if (!cmd_stop) { // can *this* even happen? I hope not!
+ if (!cmd_stop) {
con_warn("demorec: couldn't find \"stop\" command\n");
return false;
}
+ orig_stop_cb = con_getcmdcb(cmd_stop);
if (!find_demorecorder(cmd_stop)) {
con_warn("demorec: couldn't find demo recorder instance\n");
return false;
@@ -256,26 +218,116 @@ bool demorec_init(void) {
con_warn("demorec: couldn't unprotect CDemoRecorder vtable: %s\n", err);
return false;
}
-
- if (!find_recmembers(vtable[7])) { // XXX: stop hardcoding this!?
+ if (!find_recmembers(vtable[gamedata_vtidx_StopRecording])) {
con_warn("demorec: couldn't find m_bRecording and m_nDemoNumber\n");
return false;
}
- orig_SetSignonState = (f_SetSignonState)hook_vtable(vtable,
+ orig_SetSignonState = (SetSignonState_func)hook_vtable(vtable,
gamedata_vtidx_SetSignonState, (void *)&hook_SetSignonState);
- orig_StopRecording = (f_StopRecording)hook_vtable(vtable,
+ orig_StopRecording = (StopRecording_func)hook_vtable(vtable,
gamedata_vtidx_StopRecording, (void *)&hook_StopRecording);
- orig_stop_callback = cmd_stop->cb;
- cmd_stop->cb = &hook_stop_callback;
+ orig_record_cb = cmd_record->cb; cmd_record->cb = &hook_record_cb;
+ orig_stop_cb = cmd_stop->cb; cmd_stop->cb = &hook_stop_cb;
sst_autorecord->base.flags &= ~CON_HIDDEN;
return true;
}
-// make custom data a separate feature so we don't lose autorecording if we
-// can't find the WriteMessage stuff
+void demorec_end(void) {
+ // avoid dumb edge case if someone somehow records and immediately unloads
+ if (*recording && *demonum == 0) *demonum = 1;
+ void **vtable = *(void ***)demorecorder;
+ unhook_vtable(vtable, gamedata_vtidx_SetSignonState,
+ (void *)orig_SetSignonState);
+ unhook_vtable(vtable, gamedata_vtidx_StopRecording,
+ (void *)orig_StopRecording);
+ cmd_record->cb = orig_record_cb;
+ cmd_stop->cb = orig_stop_cb;
+}
+
+// custom data writing stuff is a separate feature, defined below. it we can't
+// find WriteMessage, we can still probably do the auto recording stuff above
+
+static int nbits_msgtype;
+static int nbits_datalen;
+
+// The engine allows usermessages up to 255 bytes, we add 2 bytes of overhead,
+// and then there's the leading bits before that too (see create_message)
+static char bb_buf[DEMOREC_CUSTOM_MSG_MAX + 4];
+static struct bitbuf bb = {
+ bb_buf, sizeof(bb_buf), sizeof(bb_buf) * 8, 0, false, false, "SST"
+};
+
+static void create_message(struct bitbuf *msg, const void *buf, int len) {
+ // The way we pack our custom demo data is via a user message packet with
+ // type "HudText" - this causes the client to do a text lookup which will
+ // simply silently fail on invalid keys. By making the first byte null
+ // (creating an empty string), we get the rest of the packet to stick in
+ // whatever other data we want.
+ //
+ // Notes from Uncrafted:
+ // > But yeah the data you want to append is as follows:
+ // > - 6 bits (5 bits in older versions) for the message type - should be 23
+ // > for user message
+ bitbuf_appendbits(msg, 23, nbits_msgtype);
+ // > - 1 byte for the user message type - should be 2 for HudText
+ bitbuf_appendbyte(msg, 2);
+ // > - ~~an int~~ 11 or 12 bits for the length of your data in bits,
+ bitbuf_appendbits(msg, len * 8, nbits_datalen); // NOTE: assuming len <= 254
+ // > - your data
+ // [first the aforementioned null byte, plus an arbitrary marker byte to
+ // avoid confusion when parsing the demo later...
+ bitbuf_appendbyte(msg, 0);
+ bitbuf_appendbyte(msg, 0xAC);
+ // ... and then just the data itself]
+ bitbuf_appendbuf(msg, buf, len);
+ // Thanks Uncrafted, very cool!
+}
+
+typedef void (*VCALLCONV WriteMessages_func)(void *this, struct bitbuf *msg);
+static WriteMessages_func WriteMessages = 0;
+
+void demorec_writecustom(void *buf, int len) {
+ create_message(&bb, buf, len);
+ WriteMessages(demorecorder, &bb);
+ bitbuf_reset(&bb);
+}
+
+// This finds the CDemoRecorder::WriteMessages() function, which takes a raw
+// network packet, wraps it up in the appropriate demo framing format and writes
+// it out to the demo file being recorded.
+static bool find_WriteMessages(void) {
+ // TODO(compat): probably rewrite this to just scan for a call instruction!
+ const uchar *insns = (*(uchar ***)demorecorder)[gamedata_vtidx_RecordPacket];
+ // RecordPacket calls WriteMessages pretty much right away:
+ // 56 push esi
+ // 57 push edi
+ // 8B F1 mov esi,ecx
+ // 8D BE lea edi,[esi + 0x68c]
+ // 8C 06 00 00
+ // 57 push edi
+ // E8 call CDemoRecorder_WriteMessages
+ // B0 EF FF FF
+ // So we just double check the byte pattern...
+ static const uchar bytes[] =
+#ifdef _WIN32
+ HEXBYTES(56, 57, 8B, F1, 8D, BE, 8C, 06, 00, 00, 57, E8);
+#else
+#warning This is possibly different on Linux too, have a look!
+ {-1, -1, -1, -1, -1, -1};
+#endif
+ if (!memcmp(insns, bytes, sizeof(bytes))) {
+ ssize off = mem_loadoffset(insns + sizeof(bytes));
+ // ... and then offset is relative to the address of whatever is _after_
+ // the call instruction... because x86.
+ WriteMessages = (WriteMessages_func)(insns + sizeof(bytes) + 4 + off);
+ return true;
+ }
+ return false;
+}
+
bool demorec_custom_init(void) {
if (!gamedata_has_vtidx_GetEngineBuildNumber ||
!gamedata_has_vtidx_RecordPacket) {
@@ -319,13 +371,4 @@ bool demorec_custom_init(void) {
return find_WriteMessages();
}
-void demorec_end(void) {
- void **vtable = *(void ***)demorecorder;
- unhook_vtable(vtable, gamedata_vtidx_SetSignonState,
- (void *)orig_SetSignonState);
- unhook_vtable(vtable, gamedata_vtidx_StopRecording,
- (void *)orig_StopRecording);
- cmd_stop->cb = orig_stop_callback;
-}
-
// vi: sw=4 ts=4 noet tw=80 cc=80
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 15:36:20 +0000