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FreeBSD: rework setsid code

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Pull request #650 is not valid to avoid run session twice.
It certainly stops running session twice but causes #1016.

In FreeBSD, sesman process will run like this. The intermediate
sesman is needed to detect session termination correctly.

xrdp-sesman (daemon)
    |
    +- xrdp-sesman (FreeBSD specific intermediate sesman)
        |
        +- xrdp-sesman (bsd sesion leader & each session)
             |
             +- Xorg
             +- startwm.sh
             +- xrdp-chansrv

To stop runninng session twice correctly, just exit before the
intermediate sesman executes Xorg, WM and chansrv.
This commit is contained in:
Koichiro IWAO 2018-02-05 17:38:20 +09:00
parent 4cee6726f8
commit c50015122c
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GPG Key ID: 9F72CDBC01BF10EB
1 changed files with 29 additions and 11 deletions
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40
sesman/session.c
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@ -484,22 +484,40 @@ session_start_fork(tbus data, tui8 type, struct SCP_CONNECTION *c,
* $OpenBSD: session.c,v 1.252 2010/03/07 11:57:13 dtucker Exp $ * $OpenBSD: session.c,v 1.252 2010/03/07 11:57:13 dtucker Exp $
* with some ideas about BSD process grouping to xrdp * with some ideas about BSD process grouping to xrdp
*/ */
pid_t bsdsespid = g_fork();
/** if (bsdsespid == -1)
* Create a new session and process group since the 4.4BSD
* setlogin() affects the entire process group
*/
if (g_setsid() < 0)
{ {
log_message(LOG_LEVEL_ERROR, }
"setsid failed - pid %d", g_getpid()); else if (bsdsespid == 0) /* BSD session leader */
{
/**
* Create a new session and process group since the 4.4BSD
* setlogin() affects the entire process group
*/
if (g_setsid() < 0)
{
log_message(LOG_LEVEL_ERROR,
"setsid failed - pid %d", g_getpid());
}
if (g_setlogin(s->username) < 0)
{
log_message(LOG_LEVEL_ERROR,
"setlogin failed for user %s - pid %d", s->username,
g_getpid());
}
} }
if (g_setlogin(s->username) < 0) g_waitpid(bsdsespid);
if (bsdsespid > 0)
{ {
log_message(LOG_LEVEL_ERROR, g_exit(0);
"setlogin failed for user %s - pid %d", s->username, /*
g_getpid()); * intermediate sesman should exit here after WM exits.
* do not execure the following codes.
*/
} }
#endif #endif
window_manager_pid = g_fork(); /* parent becomes X, window_manager_pid = g_fork(); /* parent becomes X,