commit d67b10fae2e4c48b15867f5e6a47a2746961cad7
author wrightlaw <wrightlaw@users.noreply.github.com> Thu Sep 08 16:10:48 2022 +0100
committer Christopher Faulet <cfaulet@haproxy.com> Mon Oct 10 09:02:48 2022 +0200
tree cc84c50849e97db81ec5976595f77224904bc507
parent 96878445ba73002fcd5788e867f4da7c7377fd4d

BUG/MINOR: smtpchk: SMTP Service check should gracefully close SMTP transaction

At present option smtpchk closes the TCP connection abruptly on completion of service checking,
even if successful. This can result in a very high volume of errors in backend SMTP server logs.
This patch ensures an SMTP QUIT is sent and a positive 2xx response is received from the SMTP
server prior to disconnection.

This patch depends on the following one:

 * MINOR: smtpchk: Update expect rule to fully match replies to EHLO commands

This patch should fix the issue #1812. It may be backported as far as 2.2
with the commit above On the 2.2, proxy_parse_smtpchk_opt() function is
located in src/check.c

[cf: I updated reg-tests script accordingly]

(cherry picked from commit 9a8d8a3fd0828a1cb64745318dcc5704a0b4b1a9)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 3593db1a396bd87785871f6682d5080a739d7728)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 8cedc5b32a5d025e1da54e91238a000d1937f749)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>

reg-tests/checks/smtp-check.vtc

diff --git a/reg-tests/checks/smtp-check.vtc b/reg-tests/checks/smtp-check.vtc
index 29d0ddb..9d8bb8a 100644
--- a/reg-tests/checks/smtp-check.vtc
+++ b/reg-tests/checks/smtp-check.vtc
@@ -10,6 +10,8 @@
   send "220 smtp-check.vtc SMTP Server\r\n"
   recv 16
   send "250 smtp-check.vtc\r\n"
+  recv 6
+  send "221 smtp-check.vtc closing\r\n"
 } -start
 
 server s2 {
@@ -18,6 +20,8 @@
   send "250-smtp-check.vtc\r\n"
   send "250-KEYWORD\r\n"
   send "250 LAST KEYWORD\r\n"
+  recv 6
+  send "221 smtp-check.vtc closing\r\n"
 } -start
 
 server s3 {
@@ -36,12 +40,12 @@
 
 syslog S1 -level notice {
     recv
-    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be1/srv succeeded, reason: Layer7 check passed.+code: 250.+info: \"smtp-check.vtc\".+check duration: [[:digit:]]+ms, status: 1/1 UP."
+    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be1/srv succeeded, reason: Layer7 check passed.+code: 221.+info: \"smtp-check.vtc closing\".+check duration: [[:digit:]]+ms, status: 1/1 UP."
 } -start
 
 syslog S2 -level notice {
     recv
-    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be2/srv succeeded, reason: Layer7 check passed.+code: 250.+info: \"smtp-check.vtc\".+check duration: [[:digit:]]+ms, status: 1/1 UP."
+    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be2/srv succeeded, reason: Layer7 check passed.+code: 221.+info: \"smtp-check.vtc closing\".+check duration: [[:digit:]]+ms, status: 1/1 UP."
 } -start
 
 syslog S3 -level notice {