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/*
* lbcd load module to check IMAP server.
*
* Written by Larry Schwimmer
* Copyright 1997, 1998, 2008, 2012
* The Board of Trustees of the Leland Stanford Junior University
*
* See LICENSE for licensing terms.
*/
#include <config.h>
#include <portable/socket.h>
#include <portable/system.h>
#include <server/internal.h>
#include <modules/modules.h>
#include <util/macros.h>
/*
* Given a host and timeout, probe the IMAP server. The port is not
* configurable. The host defaults to localhost. This closes down the IMAP
* connection nicely rather than just closing the connection.
*/
static int
probe_imap(const char *host, int timeout)
{
socket_type sd;
int retval = 0;
sd = tcp_connect(host ? host : "localhost", "imap", 143);
if (sd == INVALID_SOCKET)
return -1;
else {
retval = lbcd_check_reply(sd, timeout, "* OK");
/* Only for clean shutdown, don't care about failure. */
if (socket_write(sd, "tag logout\r\n", 12) < 0) {}
socket_close(sd);
}
return retval;
}
/*
* The module interface with the rest of lbcd.
*/
int
lbcd_imap_weight(uint32_t *weight_val, uint32_t *incr_val UNUSED, int timeout,
const char *portarg UNUSED, struct lbcd_reply *lb UNUSED)
{
return *weight_val = probe_imap("localhost", timeout);
}
/*
* Test routine.
*/
#ifdef MAIN
int
main(int argc, char *argv[])
{
int status;
status = probe_imap(argv[1]);
printf("imap service %savailable\n", status ? "not " : "");
return status;
}
#endif
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