smtp transport: message_linelength_limit option. Bug 1684

[exim.git] / src / src / transports / smtp.c

diff --git a/src/src/transports/smtp.c b/src/src/transports/smtp.c
index f47c6d92fbd06ffca90c30a187a0056f48cee026..12a1994646cea779ecbcb2b054c2874931c94a8a 100644 (file)
--- a/src/src/transports/smtp.c
+++ b/src/src/transports/smtp.c
@@ -111,6 +111,7 @@ optionlist smtp_transport_options[] = {
   { "lmtp_ignore_quota",    opt_bool,     LOFF(lmtp_ignore_quota) },
   { "max_rcpt",             opt_int | opt_public,
       OPT_OFF(transport_instance, max_addresses) },
+  { "message_linelength_limit", opt_int,   LOFF(message_linelength_limit) },
   { "multi_domain",         opt_expand_bool | opt_public,
       OPT_OFF(transport_instance, multi_domain) },
   { "port",                 opt_stringptr, LOFF(port) },
@@ -207,6 +208,7 @@ smtp_transport_options_block smtp_transport_option_defaults = {
   .size_addition =             1024,
   .hosts_max_try =             5,
   .hosts_max_try_hardlimit =   50,
+  .message_linelength_limit =  998,
   .address_retry_include_sender = TRUE,
   .allow_localhost =           FALSE,
   .authenticated_sender_force =        FALSE,
@@ -4524,6 +4526,23 @@ DEBUG(D_transport)
       cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
   }
 
+/* Check the restrictions on line length */
+
+debug_printf("%s %d: max_received_linelength %u message_linelength_limit %u\n", __FUNCTION__, __LINE__, max_received_linelength, ob->message_linelength_limit);
+if (max_received_linelength > ob->message_linelength_limit)
+  {
+  struct timeval now;
+  gettimeofday(&now, NULL);
+
+  for (address_item * addr = addrlist; addr; addr = addr->next)
+    if (addr->transport_return == DEFER)
+      addr->transport_return = PENDING_DEFER;
+
+  set_errno_nohost(addrlist, ERRNO_SMTPFORMAT,
+    US"message has lines too long for transport", FAIL, TRUE, &now);
+  goto END_TRANSPORT;
+  }
+
 /* Set the flag requesting that these hosts be added to the waiting
 database if the delivery fails temporarily or if we are running with
 queue_smtp or a 2-stage queue run. This gets unset for certain