1 files changed, 38 insertions, 0 deletions
diff --git a/src/lib-smtp/smtp-command.h b/src/lib-smtp/smtp-command.h
new file mode 100644
index 0000000..94f2251
--- /dev/null
+++ b/src/lib-smtp/smtp-command.h
@@ -0,0 +1,38 @@
+#ifndef SMTP_COMMAND_H
+#define SMTP_COMMAND_H
+
+#define SMTP_COMMAND_DEFAULT_MAX_PARAMETERS_SIZE  4*1024
+#define SMTP_COMMAND_DEFAULT_MAX_AUTH_SIZE        8*1024
+#define SMTP_COMMAND_DEFAULT_MAX_DATA_SIZE        40*1024*1024
+
+struct smtp_command_limits {
+	/* Maximum size of command parameters, starting after first space */
+	size_t max_parameters_size;
+	/* Maximum size of authentication response */
+	size_t max_auth_size;
+	/* Absolute maximum size of command data, beyond which the parser yields
+	   a fatal error; i.e. closing the connection in the server. This should
+	   be higher than a normal message size limit, which would return a
+	   normal informative error. The limit here just serves to protect
+	   against abuse. */
+	uoff_t max_data_size;
+};
+
+struct smtp_command {
+	const char *name;
+	const char *parameters;
+};
+
+static inline void
+smtp_command_limits_merge(struct smtp_command_limits *limits,
+			  const struct smtp_command_limits *new_limits)
+{
+	if (new_limits->max_parameters_size > 0)
+		limits->max_parameters_size = new_limits->max_parameters_size;
+	if (new_limits->max_auth_size > 0)
+		limits->max_auth_size = new_limits->max_auth_size;
+	if (new_limits->max_data_size > 0)
+		limits->max_data_size = new_limits->max_data_size;
+}
+
+#endif