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check_smtp: Add option to prefix PROXY header

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This enables checks of SMTP servers that expect the haproxy
PROXY protocol:  -o smtpd_upstream_proxy_protocol=haproxy.

Backported from nagios-plugins:
3246efe923
This commit is contained in:
Patrick Uiterwijk 2018-12-13 18:24:53 +01:00 committed by Franz Schwartau
parent d01740f22e
commit ce85affd20
1 changed files with 16 additions and 1 deletions
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17
plugins/check_smtp.c
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@ -52,6 +52,7 @@ int days_till_exp_warn, days_till_exp_crit;
enum {
SMTP_PORT = 25
};
#define PROXY_PREFIX "PROXY TCP4 0.0.0.0 0.0.0.0 25 25\r\n"
#define SMTP_EXPECT "220"
#define SMTP_HELO "HELO "
#define SMTP_EHLO "EHLO "
@ -102,6 +103,7 @@ double critical_time = 0;
int check_critical_time = FALSE;
int verbose = 0;
int use_ssl = FALSE;
short use_proxy_prefix = FALSE;
short use_ehlo = FALSE;
short use_lhlo = FALSE;
short ssl_established = 0;
@ -184,6 +186,13 @@ main (int argc, char **argv)
if (result == STATE_OK) { /* we connected */
/* If requested, send PROXY header */
if (use_proxy_prefix) {
if (verbose)
printf ("Sending header %s\n", PROXY_PREFIX);
send(sd, PROXY_PREFIX, strlen(PROXY_PREFIX), 0);
}
/* watch for the SMTP connection string and */
/* return a WARNING status if we couldn't read any data */
if (recvlines(buffer, MAX_INPUT_BUFFER) <= 0) {
@ -478,6 +487,7 @@ process_arguments (int argc, char **argv)
{"starttls",no_argument,0,'S'},
{"certificate",required_argument,0,'D'},
{"ignore-quit-failure",no_argument,0,'q'},
{"proxy",no_argument,0,'r'},
{0, 0, 0, 0}
};
@ -494,7 +504,7 @@ process_arguments (int argc, char **argv)
}
while (1) {
c = getopt_long (argc, argv, "+hVv46Lt:p:f:e:c:w:H:C:R:SD:F:A:U:P:q",
c = getopt_long (argc, argv, "+hVv46Lrt:p:f:e:c:w:H:C:R:SD:F:A:U:P:q",
longopts, &option);
if (c == -1 || c == EOF)
@ -621,6 +631,9 @@ process_arguments (int argc, char **argv)
use_ssl = TRUE;
use_ehlo = TRUE;
break;
case 'r':
use_proxy_prefix = TRUE;
break;
case 'L':
use_lhlo = TRUE;
break;
@ -819,6 +832,8 @@ print_help (void)
printf (" %s\n", _("FROM-address to include in MAIL command, required by Exchange 2000")),
printf (" %s\n", "-F, --fqdn=STRING");
printf (" %s\n", _("FQDN used for HELO"));
printf (" %s\n", "-r, --proxy");
printf (" %s\n", _("Use PROXY protocol prefix for the connection."));
#ifdef HAVE_SSL
printf (" %s\n", "-D, --certificate=INTEGER[,INTEGER]");
printf (" %s\n", _("Minimum number of days a certificate has to be valid."));