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From 7b952299ea7dbe17289d5f34d5c2867a8077fb19 Mon Sep 17 00:00:00 2001
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From: Ryan O'Hara <rohara@redhat.com>
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Date: Thu, 28 Feb 2019 08:22:45 -0600
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Subject: [PATCH] BUG/MEDIUM: tcp-check: single connect rule can't detect DOWN
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servers
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When tcpcheck is used to do TCP port monitoring only and the script is
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composed by a single "tcp-check connect" rule (whatever port and ssl
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options enabled), then the server can't be seen as DOWN.
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Simple configuration to reproduce:
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backend b
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[...]
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option tcp-check
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tcp-check connect
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server s1 127.0.0.1:22 check
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The main reason for this issue is that the piece of code which validates
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that we're not at the end of the chained list (of rules) prevents
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executing the validation of the establishment of the TCP connection.
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Since validation is not executed, the rule is terminated and the report
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says no errors were encountered, hence the server is UP all the time.
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The workaround is simple: move the connection validation outsied the
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CONNECT rule processing loop, into the main function.
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That way, if the connection status is not CONNECTED, then HAProxy will
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now add more time to wait for it. If the time is expired, an error is
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now well reported.
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---
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src/checks.c | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/src/checks.c b/src/checks.c
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index 27a23b21..f280367b 100644
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--- a/src/checks.c
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+++ b/src/checks.c
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@@ -2246,6 +2246,25 @@ static void tcpcheck_main(struct connection *conn)
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} /* end expect */
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} /* end loop over double chained step list */
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+ /* don't do anything until the connection is established */
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+ if (!(conn->flags & CO_FL_CONNECTED)) {
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+ /* update expire time, should be done by process_chk */
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+ /* we allow up to min(inter, timeout.connect) for a connection
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+ * to establish but only when timeout.check is set
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+ * as it may be to short for a full check otherwise
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+ */
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+ while (tick_is_expired(t->expire, now_ms)) {
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+ int t_con;
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+
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+ t_con = tick_add(t->expire, s->proxy->timeout.connect);
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+ t->expire = tick_add(t->expire, MS_TO_TICKS(check->inter));
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+
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+ if (s->proxy->timeout.check)
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+ t->expire = tick_first(t->expire, t_con);
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+ }
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+ return;
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+ }
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+
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/* We're waiting for some I/O to complete, we've reached the end of the
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* rules, or both. Do what we have to do, otherwise we're done.
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*/
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--
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2.20.1
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