From 854196b9645097bac7dc806d1a3a08c1ef379a3b Mon Sep 17 00:00:00 2001
From: Stef Walter <stef@memberwebs.com>
Date: Fri, 1 Oct 2004 20:20:41 +0000
Subject: Send NOOPs to the server during slow connections to prevent timeouts.
 Bug #134

---
 common/smtppass.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

(limited to 'common/smtppass.c')

diff --git a/common/smtppass.c b/common/smtppass.c
index dc1cf77..8b71f4d 100644
--- a/common/smtppass.c
+++ b/common/smtppass.c
@@ -78,7 +78,7 @@ typedef struct spthread
 spthread_t;
 
 /* -----------------------------------------------------------------------
- *  STRINGS
+ *  DATA
  */
 
 #define CRLF                "\r\n"
@@ -93,6 +93,7 @@ spthread_t;
 #define SMTP_REJPREFIX      "550 Content Rejected; "
 
 #define SMTP_DATA           "DATA" CRLF
+#define SMTP_NOOP           "NOOP" CRLF
 #define SMTP_BANNER         "220 smtp.passthru" CRLF
 #define SMTP_HELO_RSP       "250 smtp.passthru" CRLF
 #define SMTP_EHLO_RSP       "250-smtp.passthru" CRLF
@@ -126,6 +127,9 @@ spthread_t;
 
 #define LINE_TOO_LONG(l)      ((l) >= (SP_LINE_LENGTH - 2))
 
+/* The amount interval at which to send NOOPS to server */
+#define INTERACTION_DELTA   10
+
 /* -----------------------------------------------------------------------
  *  CONFIGURATION OPTIONS
  *
@@ -179,6 +183,7 @@ static int read_server_response(spctx_t* ctx);
 static int parse_config_file(const char* configfile);
 static char* parse_address(char* line);
 static const char* get_successful_rsp(const char* line, int* cont);
+static void do_server_noop(spctx_t* ctx);
 
 /* Used externally in some cases */
 int sp_parse_option(const char* name, const char* option);
@@ -1123,6 +1128,14 @@ int sp_read_data(spctx_t* ctx, const char** data)
         return -1;
     };
 
+    /*
+     * During this time we're just reading from the client. If we haven't
+     * had any interaction with the server recently then send something
+     * to let it know we're still around.
+     */
+    if((ctx->server.last_action + INTERACTION_DELTA) < time(NULL))
+        do_server_noop(ctx);
+
     if(ctx->_crlf && strcmp(ctx->client.line, DATA_END_SIG) == 0)
         return 0;
 
@@ -1373,6 +1386,12 @@ static int read_server_response(spctx_t* ctx)
     return 0;
 }
 
+static void do_server_noop(spctx_t* ctx)
+{
+    if(spio_write_data(ctx, &(ctx->server), SMTP_NOOP) != -1)
+        spio_read_line(ctx, &(ctx->server), SPIO_DISCARD);
+}
+
 void sp_setup_forked(spctx_t* ctx, int file)
 {
     /* Signals we've messed with */
-- 
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