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BUG/MINOR: tcpcheck: Be able to expect an empty response

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It is not possible to successfully match an empty response. However using
regex, it should be possible to reject response with any content. For
instance:

   tcp-check expect !rstring ".+"

It may seem a be strange to do that, but it is possible, it is a valid
config. So it must work. Thanks to this patch, it is now really supported.

This patch may be backported as far as 2.2. But only if someone ask for it.
This commit is contained in:
Christopher Faulet 2023-03-20 16:49:51 +01:00
parent 0222cc6366
commit a664aa6a68
1 changed files with 17 additions and 28 deletions
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37
src/tcpcheck.c
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@ -421,6 +421,7 @@ static void tcpcheck_expect_onerror_message(struct buffer *msg, struct check *ch
int match, struct ist info)
{
struct sample *smp;
int is_empty;
/* Follows these step to produce the info message:
* 1. if info field is already provided, copy it
@ -438,9 +439,18 @@ static void tcpcheck_expect_onerror_message(struct buffer *msg, struct check *ch
goto comment;
}
if (check->type == PR_O2_TCPCHK_CHK &&
(check->tcpcheck_rules->flags & TCPCHK_RULES_PROTO_CHK) != TCPCHK_RULES_TCP_CHK)
is_empty = (IS_HTX_SC(check->sc) ? htx_is_empty(htxbuf(&check->bi)) : !b_data(&check->bi));
if (is_empty) {
TRACE_ERROR("empty response", CHK_EV_RX_DATA|CHK_EV_RX_ERR, check);
chunk_printf(msg, "TCPCHK got an empty response at step %d",
tcpcheck_get_step_id(check, rule));
goto comment;
}
if (check->type == PR_O2_TCPCHK_CHK &&
(check->tcpcheck_rules->flags & TCPCHK_RULES_PROTO_CHK) != TCPCHK_RULES_TCP_CHK) {
goto comment;
}
chunk_strcat(msg, (match ? "TCPCHK matched unwanted content" : "TCPCHK did not match content"));
switch (rule->expect.type) {
@ -1597,32 +1607,11 @@ enum tcpcheck_eval_ret tcpcheck_eval_recv(struct check *check, struct tcpcheck_r
TRACE_ERROR("connection error during recv", CHK_EV_RX_DATA|CHK_EV_RX_ERR, check);
goto stop;
}
if (!cur_read) {
if (sc_ep_test(sc, SE_FL_EOI)) {
/* If EOI is set, it means there is a response or an error */
goto out;
}
if (!sc_ep_test(sc, SE_FL_WANT_ROOM | SE_FL_ERROR | SE_FL_EOS)) {
else if (!cur_read && !sc_ep_test(sc, SE_FL_WANT_ROOM | SE_FL_ERROR | SE_FL_EOS)) {
conn->mux->subscribe(sc, SUB_RETRY_RECV, &sc->wait_event);
TRACE_DEVEL("waiting for response", CHK_EV_RX_DATA, check);
goto wait_more_data;
}
if (is_empty) {
int status;
chunk_printf(&trash, "TCPCHK got an empty response at step %d",
tcpcheck_get_step_id(check, rule));
if (rule->comment)
chunk_appendf(&trash, " comment: '%s'", rule->comment);
TRACE_ERROR("empty response", CHK_EV_RX_DATA|CHK_EV_RX_ERR, check);
status = ((rule->expect.err_status != HCHK_STATUS_UNKNOWN) ? rule->expect.err_status : HCHK_STATUS_L7RSP);
set_server_check_status(check, status, trash.area);
goto stop;
}
}
TRACE_DATA("data received", CHK_EV_RX_DATA, check, 0, 0, (size_t[]){cur_read});
out: