Hello,
the following trivial patch allows to configure the maximum number of
unrecognised SMTP commands. I don't know why 5 was used as default.
To me, it seems as if a lower value might keep more spam away.
Michael
----------------------------------------------------------------------
--- globals.h.orig 2002-12-16 15:55:55.000000000 +0100
+++ globals.h 2002-12-16 15:57:20.000000000 +0100
@@ -460,6 +460,7 @@
extern BOOL smtp_input; /* TRUE if input is via SMTP */
extern int smtp_load_reserve; /* Only from reserved if load > this */
extern int smtp_mailcmd_count; /* Count of MAIL commands */
+extern int smtp_max_unrecognized; /* Maximum number of unrecognized cmds */
extern FILE *smtp_out; /* Incoming SMTP output file */
extern int smtp_port; /* Alternate SMTP port number */
extern uschar *smtp_ratelimit_hosts; /* Rate limit these hosts */
--- globals.c.orig 2002-12-16 16:03:49.000000000 +0100
+++ globals.c 2002-12-16 15:58:00.000000000 +0100
@@ -753,6 +753,7 @@
BOOL smtp_input = FALSE;
int smtp_load_reserve = -1;
int smtp_mailcmd_count = 0;
+int smtp_max_unrecognized = 5;
FILE *smtp_out = NULL;
int smtp_port = -1;
uschar *smtp_etrn_command = NULL;
--- readconf.c.orig 2002-12-16 16:00:05.000000000 +0100
+++ readconf.c 2002-12-16 16:00:38.000000000 +0100
@@ -175,6 +175,7 @@
{ "smtp_etrn_command", opt_stringptr, &smtp_etrn_command },
{ "smtp_etrn_serialize", opt_bool, &smtp_etrn_serialize },
{ "smtp_load_reserve", opt_fixed, &smtp_load_reserve },
+ { "smtp_max_unrecognized", opt_int, &smtp_max_unrecognized },
{ "smtp_ratelimit_hosts", opt_stringptr, &smtp_ratelimit_hosts },
{ "smtp_ratelimit_mail", opt_stringptr, &smtp_ratelimit_mail },
{ "smtp_ratelimit_rcpt", opt_stringptr, &smtp_ratelimit_rcpt },
--- smtp_in.c.orig 2002-12-16 16:00:49.000000000 +0100
+++ smtp_in.c 2002-12-16 16:00:58.000000000 +0100
@@ -2827,7 +2827,7 @@
default:
- if (unknown_command_count++ >= smtp_max_unrecognized)
+ if (unknown_command_count++ >= 5)
{
/* Just logs */
synprot_error(L_smtp_syntax_error, 0, NULL, US"unrecognized command");
