From: Timo Sirainen <timo.sirainen@open-xchange.com>
Date: Thu, 16 Apr 2026 15:38:45 +0000 (+0200)
Subject: [PATCH 4/5] imap-login: Add dict_reset side-channel command to imap-proxy
X-Git-Tag: archive/raspbian/1%2.4.1+dfsg1-6+rpi1+deb13u7^2~10
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=73081009b2ff1e6015d43210f4ca83abdc70e995;p=dovecot.git

[PATCH 4/5] imap-login: Add dict_reset side-channel command to imap-proxy

When imap_compress_on_proxy is enabled, DEFLATE compression runs inside
the imap-login process.  The imap backend process cannot call
o_stream_deflate_reset_dict() directly on a remote stream, so this adds
a new side-channel command "dict_reset" that the backend can send to
trigger the dictionary reset on the proxy side.

Gbp-Pq: Name 0004-imap-login-Add-dict_reset-side-channel-command-to-im.patch
---

diff --git a/src/imap-login/imap-proxy.c b/src/imap-login/imap-proxy.c
index 03dad69..2084cb2 100644
--- a/src/imap-login/imap-proxy.c
+++ b/src/imap-login/imap-proxy.c
@@ -10,6 +10,7 @@
 #include "str-sanitize.h"
 #include "safe-memset.h"
 #include "compression.h"
+#include "ostream-zlib.h"
 #include "dsasl-client.h"
 #include "imap-login-client.h"
 #include "client-authenticate.h"
@@ -641,11 +642,24 @@ proxy_side_cmd_compress(struct client *client, const char *const *args,
 	return 0;
 }
 
+static int
+proxy_side_cmd_dict_reset(struct client *client,
+			  const char *const *args ATTR_UNUSED,
+			  const char **error_r ATTR_UNUSED)
+{
+	struct ostream *client_output =
+		login_proxy_get_client_ostream(client->login_proxy);
+	o_stream_deflate_reset_dict(client_output);
+	return 0;
+}
+
 int imap_proxy_side_channel_input(struct client *client,
 				  const char *const *args, const char **error_r)
 {
 	if (strcmp(args[0], "compress") == 0)
 		return proxy_side_cmd_compress(client, args + 1, error_r);
+	else if (strcmp(args[0], "dict_reset") == 0)
+		return proxy_side_cmd_dict_reset(client, args + 1, error_r);
 	else {
 		*error_r = "Unsupported command";
 		return -1;