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/*
* Copyright (c) 2020 Proofpoint, Inc. and its suppliers.
* All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*
*/
#include <sm/gen.h>
#if _FFR_DMTRIGGER && _FFR_NOTIFY < 2
#include <sm/conf.h> /* FDSET_CAST */
#include <sm/fdset.h>
#include <sm/assert.h>
#include <sm/notify.h>
#include "notify.h"
#include <sm/time.h>
#include <sm/string.h>
#include <sys/types.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h> /* for memset() */
static int Notifypipe[2];
#define NotifyRDpipe Notifypipe[0]
#define NotifyWRpipe Notifypipe[1]
#define CLOSEFD(fd) do { \
if ((fd) != -1) { \
(void) close(fd); \
fd = - 1; \
} \
} while (0) \
/*
** SM_NOTIFY_INIT -- initialize notify system
**
** Parameters:
** flags -- ignored
**
** Returns:
** 0: success
** <0: -errno
*/
int
sm_notify_init(flags)
int flags;
{
if (pipe(Notifypipe) < 0)
return -errno;
return 0;
}
/*
** SM_NOTIFY_START -- start notify system
**
** Parameters:
** owner -- owner.
** flags -- currently ignored.
**
** Returns:
** 0: success
** <0: -errno
*/
int
sm_notify_start(owner, flags)
bool owner;
int flags;
{
int r;
r = 0;
if (owner)
CLOSEFD(NotifyWRpipe);
else
CLOSEFD(NotifyRDpipe);
return r;
}
/*
** SM_NOTIFY_STOP -- stop notify system
**
** Parameters:
** owner -- owner.
** flags -- currently ignored.
**
** Returns:
** 0: success
** <0: -errno
*/
int
sm_notify_stop(owner, flags)
bool owner;
int flags;
{
if (owner)
CLOSEFD(NotifyRDpipe);
else
CLOSEFD(NotifyWRpipe);
return 0;
}
/*
** SM_NOTIFY_SND -- send notification
**
** Parameters:
** buf -- where to write data
** buflen -- len of buffer
**
** Returns:
** 0: success
** <0: -errno
*/
int
sm_notify_snd(buf, buflen)
char *buf;
size_t buflen;
{
int r;
int save_errno;
size_t len;
char netstr[MAX_NETSTR];
SM_REQUIRE(buf != NULL);
SM_REQUIRE(buflen > 0);
if (NotifyWRpipe < 0)
return -EINVAL;
if (buflen >= MAX_NETSTR - 7)
return -E2BIG; /* XXX "TOO LARGE"? */
len = sm_snprintf(netstr, sizeof(netstr), "%04d:%s,", (int)buflen, buf);
r = write(NotifyWRpipe, netstr, len);
save_errno = errno;
SM_DBG((stderr, "pid=%ld, write=%d, fd=%d, e=%d\n", (long)getpid(), r, NotifyWRpipe, save_errno));
return r >= 0 ? 0 : -save_errno;
}
/*
** SM_NOTIFY_RCV -- receive notification
**
** Parameters:
** buf -- where to write data
** buflen -- len of buffer
** tmo -- timeout (micro seconds)
**
** Returns:
** 0: EOF (XXX need to provide info about client)
** >0: length of received data
** <0: -errno
*/
int
sm_notify_rcv(buf, buflen, tmo)
char *buf;
size_t buflen;
long tmo;
{
int r, len;
int save_errno;
fd_set readfds;
struct timeval timeout, *tval;
SM_REQUIRE(buf != NULL);
SM_REQUIRE(buflen > NETSTRPRE + 2);
if (NotifyRDpipe < 0)
return -EINVAL;
FD_ZERO(&readfds);
SM_FD_SET(NotifyRDpipe, &readfds);
SM_MICROS2TVAL(tmo, tval, timeout);
do {
r = select(NotifyRDpipe + 1, FDSET_CAST &readfds, NULL, NULL, tval);
save_errno = errno;
SM_DBG((stderr, "pid=%ld, select=%d, fd=%d, e=%d\n", (long)getpid(), r, NotifyRDpipe, save_errno));
} while (r < 0 && save_errno == EINTR);
RDNETSTR(r, NotifyRDpipe, (void)0);
}
#endif /* _FFR_DMTRIGGER && _FFR_NOTIFY < 2 */
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