Resend EHLO after TLS negotiation as per RFC3207 (Holger Weiss - 1482832)

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1493 f882894a-f735-0410-b71e-b25c423dba1c

1 files changed, 32 insertions, 2 deletions

diff --git a/plugins/check_smtp.c b/plugins/check_smtp.c
index e7cf2ea..e4da30e 100644
--- a/plugins/check_smtp.c
+++ b/plugins/check_smtp.c
@@ -282,6 +282,35 @@ main (int argc, char **argv)
                   } else {
                         ssl_established = 1;
                   }
+
+                /*
+                 * Resend the EHLO command.
+                 *
+                 * RFC 3207 (4.2) says: ``The client MUST discard any knowledge
+                 * obtained from the server, such as the list of SMTP service
+                 * extensions, which was not obtained from the TLS negotiation
+                 * itself.  The client SHOULD send an EHLO command as the first
+                 * command after a successful TLS negotiation.''  For this
+                 * reason, some MTAs will not allow an AUTH LOGIN command before
+                 * we resent EHLO via TLS.
+                 */
+                if (my_send(helocmd, strlen(helocmd)) <= 0) {
+                        printf(_("SMTP UNKNOWN - Cannot send EHLO command via TLS.\n"));
+                        my_close();
+                        return STATE_UNKNOWN;
+                }
+                if (verbose)
+                        printf(_("sent %s"), helocmd);
+                if ((n = my_recv(buffer, MAX_INPUT_BUFFER - 1)) <= 0) {
+                        printf(_("SMTP UNKNOWN - Cannot read EHLO response via TLS.\n"));
+                        my_close();
+                        return STATE_UNKNOWN;
+                }
+                if (verbose) {
+                        buffer[n] = '\0';
+                        printf("%s", buffer);
+                }
+
 #  ifdef USE_OPENSSL
                   if ( check_cert ) {
                     result = np_net_ssl_check_cert(days_till_exp);
@@ -705,8 +734,8 @@ print_help (void)
         printf (_(UT_IPv46));
 
         printf (" %s\n", "-e, --expect=STRING");
-  printf (_("String to expect in first line of server response (default: '%s')"),SMTP_EXPECT);
-  printf (" %s\n\n", "-n, nocommand\n");
+  printf (_("    String to expect in first line of server response (default: '%s')\n"), SMTP_EXPECT);
+  printf (" %s\n", "-n, nocommand");
   printf ("    %s\n", _("Suppress SMTP command"));
   printf (" %s\n", "-C, --command=STRING");
   printf ("    %s\n", _("SMTP command (may be used repeatedly)"));
@@ -734,6 +763,7 @@ print_help (void)
 
         printf (_(UT_VERBOSE));
 
+        printf("\n");
         printf ("%s\n", _("Successul connects return STATE_OK, refusals and timeouts return"));
   printf ("%s\n", _("STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful"));
   printf ("%s\n", _("connects, but incorrect reponse messages from the host result in"));