check_smtp: Abort on missing/unexpected greeting

Abort immediately if we don't receive a server greeting or if the
greeting doesn't contain the "--expect"ed string (by default: "220")
instead of blindly sending the EHLO/HELO line.

Spotted by Daniel Piddock, see Debian bug report #611914.

1 files changed, 2 insertions, 2 deletions

diff --git a/plugins/check_smtp.c b/plugins/check_smtp.c
index 3da724b..ed49163 100644
--- a/plugins/check_smtp.c
+++ b/plugins/check_smtp.c
@@ -183,7 +183,7 @@ main (int argc, char **argv)
                 /* return a WARNING status if we couldn't read any data */
                 if (recvlines(buffer, MAX_INPUT_BUFFER) <= 0) {
                         printf (_("recv() failed\n"));
-                        result = STATE_WARNING;
+                        return STATE_WARNING;
                 }
                 else {
                         if (verbose)
@@ -197,7 +197,7 @@ main (int argc, char **argv)
                                 else
                                         printf (_("Invalid SMTP response received from host on port %d: %s\n"),
                                                                         server_port, buffer);
-                                result = STATE_WARNING;
+                                return STATE_WARNING;
                         }
                 }