If an application gives the first parameter to OSC 52, validate and pass

on to outside terminal. GitHub issue 3192.

cmd-load-buffer.c

@@ -77,7 +77,7 @@ cmd_load_buffer_done(__unused struct client *c, const char *path, int error,
 		} else if (tc != NULL &&
 		    tc->session != NULL &&
 		    (~tc->flags & CLIENT_DEAD))
-			tty_set_selection(&tc->tty, copy, bsize);
+			tty_set_selection(&tc->tty, "", copy, bsize);
 		if (tc != NULL)
 			server_client_unref(tc);
 	}

cmd-set-buffer.c

@@ -131,7 +131,7 @@ cmd_set_buffer_exec(struct cmd *self, struct cmdq_item *item)
 		return (CMD_RETURN_ERROR);
 	}
 	if (args_has(args, 'w') && tc != NULL)
- 		tty_set_selection(&tc->tty, bufdata, bufsize);
+ 		tty_set_selection(&tc->tty, "", bufdata, bufsize);
 
 	return (CMD_RETURN_NORMAL);
 }

input.c

@@ -2693,6 +2693,9 @@ input_osc_52(struct input_ctx *ictx, const char *p)
 	int			 outlen, state;
 	struct screen_write_ctx	 ctx;
 	struct paste_buffer	*pb;
+	const char*              allow = "cpqs01234567";
+	char                     flags[sizeof allow] = "";
+	u_int			 i, j = 0;
 
 	if (wp == NULL)
 		return;
@@ -2707,6 +2710,12 @@ input_osc_52(struct input_ctx *ictx, const char *p)
 		return;
 	log_debug("%s: %s", __func__, end);
 
+	for (i = 0; p + i != end; i++) {
+		if (strchr(allow, p[i]) != NULL && strchr(flags, p[i]) == NULL)
+			flags[j++] = p[i];
+	}
+	log_debug("%s: %.*s %s", __func__, (int)(end - p - 1), p, flags);
+
 	if (strcmp(end, "?") == 0) {
 		if ((pb = paste_get_top(NULL)) != NULL)
 			buf = paste_buffer_data(pb, &len);
@@ -2728,7 +2737,7 @@ input_osc_52(struct input_ctx *ictx, const char *p)
 	}
 
 	screen_write_start_pane(&ctx, wp, NULL);
-	screen_write_setselection(&ctx, out, outlen);
+	screen_write_setselection(&ctx, flags, out, outlen);
 	screen_write_stop(&ctx);
 	notify_pane("pane-set-clipboard", wp);
 

screen-write.c

@@ -2085,12 +2085,14 @@ screen_write_overwrite(struct screen_write_ctx *ctx, struct grid_cell *gc,
 
 /* Set external clipboard. */
 void
-screen_write_setselection(struct screen_write_ctx *ctx, u_char *str, u_int len)
+screen_write_setselection(struct screen_write_ctx *ctx, const char *flags,
+    u_char *str, u_int len)
 {
 	struct tty_ctx	ttyctx;
 
 	screen_write_initctx(ctx, &ttyctx, 0);
 	ttyctx.ptr = str;
+	ttyctx.ptr2 = (void *)flags;
 	ttyctx.num = len;
 
 	tty_write(tty_cmd_setselection, &ttyctx);

tmux.h

@@ -1421,6 +1421,7 @@ struct tty_ctx {
 
 	u_int			 num;
 	void			*ptr;
+	void			*ptr2;
 
 	/*
 	 * Cursor and region position before the screen was updated - this is
@@ -2278,7 +2279,7 @@ int	tty_open(struct tty *, char **);
 void	tty_close(struct tty *);
 void	tty_free(struct tty *);
 void	tty_update_features(struct tty *);
-void	tty_set_selection(struct tty *, const char *, size_t);
+void	tty_set_selection(struct tty *, const char *, const char *, size_t);
 void	tty_write(void (*)(struct tty *, const struct tty_ctx *),
 	    struct tty_ctx *);
 void	tty_cmd_alignmenttest(struct tty *, const struct tty_ctx *);
@@ -2872,7 +2873,8 @@ void	 screen_write_collect_end(struct screen_write_ctx *);
 void	 screen_write_collect_add(struct screen_write_ctx *,
 	     const struct grid_cell *);
 void	 screen_write_cell(struct screen_write_ctx *, const struct grid_cell *);
-void	 screen_write_setselection(struct screen_write_ctx *, u_char *, u_int);
+void	 screen_write_setselection(struct screen_write_ctx *, const char *,
+	     u_char *, u_int);
 void	 screen_write_rawstring(struct screen_write_ctx *, u_char *, u_int);
 void	 screen_write_alternateon(struct screen_write_ctx *,
 	     struct grid_cell *, int);

tty.c

@@ -671,7 +671,7 @@ static void
 tty_force_cursor_colour(struct tty *tty, int c)
 {
 	u_char	r, g, b;
-	char	s[13] = "";
+	char	s[13];
 
 	if (c != -1)
 		c = colour_force_rgb(c);
@@ -2082,11 +2082,12 @@ tty_cmd_cells(struct tty *tty, const struct tty_ctx *ctx)
 void
 tty_cmd_setselection(struct tty *tty, const struct tty_ctx *ctx)
 {
-	tty_set_selection(tty, ctx->ptr, ctx->num);
+	tty_set_selection(tty, ctx->ptr2, ctx->ptr, ctx->num);
 }
 
 void
-tty_set_selection(struct tty *tty, const char *buf, size_t len)
+tty_set_selection(struct tty *tty, const char *flags, const char *buf,
+    size_t len)
 {
 	char	*encoded;
 	size_t	 size;
@@ -2101,7 +2102,7 @@ tty_set_selection(struct tty *tty, const char *buf, size_t len)
 
 	b64_ntop(buf, len, encoded, size);
 	tty->flags |= TTY_NOBLOCK;
-	tty_putcode_ptr2(tty, TTYC_MS, "", encoded);
+	tty_putcode_ptr2(tty, TTYC_MS, flags, encoded);
 
 	free(encoded);
 }

window-copy.c

@@ -4570,7 +4570,7 @@ window_copy_copy_buffer(struct window_mode_entry *wme, const char *prefix,
 
 	if (options_get_number(global_options, "set-clipboard") != 0) {
 		screen_write_start_pane(&ctx, wp, NULL);
-		screen_write_setselection(&ctx, buf, len);
+		screen_write_setselection(&ctx, "", buf, len);
 		screen_write_stop(&ctx);
 		notify_pane("pane-set-clipboard", wp);
 	}
@@ -4644,7 +4644,7 @@ window_copy_append_selection(struct window_mode_entry *wme)
 
 	if (options_get_number(global_options, "set-clipboard") != 0) {
 		screen_write_start_pane(&ctx, wp, NULL);
-		screen_write_setselection(&ctx, buf, len);
+		screen_write_setselection(&ctx, "", buf, len);
 		screen_write_stop(&ctx);
 		notify_pane("pane-set-clipboard", wp);
 	}