Introduce the ``keep-session'' option. Refer to the man

page for details.  This allows MP over non-tty devices where
the original ppp process must not exit (such as sshd-spawned
ppp sessions).

5 files changed, 62 insertions, 17 deletions

diff --git a/usr.sbin/ppp/ppp/bundle.c b/usr.sbin/ppp/ppp/bundle.c
index 4fddb9cbc97..b7a19a598f3 100644
--- a/usr.sbin/ppp/ppp/bundle.c
+++ b/usr.sbin/ppp/ppp/bundle.c
@@ -23,7 +23,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: bundle.c,v 1.18 1999/05/31 23:57:35 brian Exp $
+ *	$Id: bundle.c,v 1.19 1999/06/02 00:46:55 brian Exp $
  */
 
 #include <sys/param.h>
@@ -1220,6 +1220,8 @@ bundle_ShowStatus(struct cmdargs const *arg)
                 optval(arg->bundle, OPT_SROUTES));
   prompt_Printf(arg->prompt, " ID check:      %s\n",
                 optval(arg->bundle, OPT_IDCHECK));
+  prompt_Printf(arg->prompt, " Keep-Session:  %s\n",
+                optval(arg->bundle, OPT_KEEPSESSION));
   prompt_Printf(arg->prompt, " Loopback:      %s\n",
                 optval(arg->bundle, OPT_LOOPBACK));
   prompt_Printf(arg->prompt, " PasswdAuth:    %s\n",
@@ -1520,7 +1522,8 @@ bundle_SendDatalink(struct datalink *dl, int s, struct sockaddr_un *sun)
     /* We must get the ACK before closing the descriptor ! */
     read(s, &ack, 1);
 
-    newsid = tcgetpgrp(link_fd) == getpgrp();
+    newsid = Enabled(dl->bundle, OPT_KEEPSESSION) ||
+             tcgetpgrp(link_fd) == getpgrp();
     close(link_fd);
     if (newsid)
       bundle_setsid(dl->bundle, 1);
diff --git a/usr.sbin/ppp/ppp/bundle.h b/usr.sbin/ppp/ppp/bundle.h
index 936dd8c211d..cb1ae3cbedf 100644
--- a/usr.sbin/ppp/ppp/bundle.h
+++ b/usr.sbin/ppp/ppp/bundle.h
@@ -23,7 +23,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: bundle.h,v 1.5 1999/05/31 23:57:35 brian Exp $
+ *	$Id: bundle.h,v 1.6 1999/06/02 00:46:55 brian Exp $
  */
 
 #define	PHASE_DEAD		0	/* Link is dead */
@@ -35,13 +35,14 @@
 /* cfg.opt bit settings */
 #define OPT_IDCHECK	0x0001
 #define OPT_IFACEALIAS	0x0002
-#define OPT_LOOPBACK	0x0004
-#define OPT_PASSWDAUTH	0x0008
-#define OPT_PROXY	0x0010
-#define OPT_PROXYALL	0x0020
-#define OPT_SROUTES	0x0040
-#define OPT_THROUGHPUT	0x0080
-#define OPT_UTMP	0x0100
+#define OPT_KEEPSESSION	0x0004
+#define OPT_LOOPBACK	0x0008
+#define OPT_PASSWDAUTH	0x0010
+#define OPT_PROXY	0x0020
+#define OPT_PROXYALL	0x0040
+#define OPT_SROUTES	0x0080
+#define OPT_THROUGHPUT	0x0100
+#define OPT_UTMP	0x0200
 
 #define MAX_ENDDISC_CLASS 5
 
diff --git a/usr.sbin/ppp/ppp/command.c b/usr.sbin/ppp/ppp/command.c
index 0671fccb4a5..03fa67ca7b4 100644
--- a/usr.sbin/ppp/ppp/command.c
+++ b/usr.sbin/ppp/ppp/command.c
@@ -17,7 +17,7 @@
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
- * $Id: command.c,v 1.22 1999/05/31 23:57:36 brian Exp $
+ * $Id: command.c,v 1.23 1999/06/02 00:46:55 brian Exp $
  *
  */
 #include <sys/param.h>
@@ -143,7 +143,7 @@
 #define NEG_DNS		52
 
 const char Version[] = "2.21";
-const char VersionDate[] = "$Date: 1999/05/31 23:57:36 $";
+const char VersionDate[] = "$Date: 1999/06/02 00:46:55 $";
 
 static int ShowCommand(struct cmdargs const *);
 static int TerminalCommand(struct cmdargs const *);
@@ -2271,6 +2271,8 @@ static struct cmdtab const NegotiateCommands[] = {
   {"iface-alias", NULL, IfaceAliasOptSet, LOCAL_AUTH,
    "retain interface addresses", "disable|enable",
    (const void *)OPT_IFACEALIAS},
+  {"keep-session", NULL, OptSet, LOCAL_AUTH, "Retain device session leader",
+  "disable|enable", (const void *)OPT_KEEPSESSION},
   {"loopback", NULL, OptSet, LOCAL_AUTH, "Loop packets for local iface",
   "disable|enable", (const void *)OPT_LOOPBACK},
   {"passwdauth", NULL, OptSet, LOCAL_AUTH, "Use passwd file",
@@ -2286,7 +2288,7 @@ static struct cmdtab const NegotiateCommands[] = {
   {"utmp", NULL, OptSet, LOCAL_AUTH, "Log connections in utmp",
   "disable|enable", (const void *)OPT_UTMP},
 
-#define OPT_MAX 9	/* accept/deny allowed below and not above */
+#define OPT_MAX 10	/* accept/deny allowed below and not above */
 
   {"acfcomp", NULL, NegotiateSet, LOCAL_AUTH | LOCAL_CX,
   "Address & Control field compression", "accept|deny|disable|enable",
diff --git a/usr.sbin/ppp/ppp/physical.c b/usr.sbin/ppp/ppp/physical.c
index b971808760d..24fd08eafc8 100644
--- a/usr.sbin/ppp/ppp/physical.c
+++ b/usr.sbin/ppp/ppp/physical.c
@@ -16,7 +16,7 @@
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
- *  $Id: physical.c,v 1.11 1999/06/01 19:08:52 brian Exp $
+ *  $Id: physical.c,v 1.12 1999/06/02 00:46:55 brian Exp $
  *
  */
 
@@ -595,8 +595,11 @@ physical2iov(struct physical *p, struct iovec *iov, int *niov, int maxiov,
       p->handler = (struct device *)(long)p->handler->type;
     }
 
-    if (tcgetpgrp(p->fd) == getpgrp())
+    if (Enabled(p->dl->bundle, OPT_KEEPSESSION) ||
+        tcgetpgrp(p->fd) == getpgrp())
       p->session_owner = getpid();      /* So I'll eventually get HUP'd */
+    else
+      p->session_owner = (pid_t)-1;
     timer_Stop(&p->link.throughput.Timer);
     physical_ChangedPid(p, newpid);
   }
@@ -618,7 +621,7 @@ physical2iov(struct physical *p, struct iovec *iov, int *niov, int maxiov,
 void
 physical_ChangedPid(struct physical *p, pid_t newpid)
 {
-  if (p->fd >= 0 && p->type != PHYS_DIRECT) {
+  if (p->fd >= 0 && *p->name.full == '/' && p->type != PHYS_DIRECT) {
     int res;
 
     if ((res = ID0uu_lock_txfr(p->name.base, newpid)) != UU_LOCK_OK)
diff --git a/usr.sbin/ppp/ppp/ppp.8 b/usr.sbin/ppp/ppp/ppp.8
index 20cde5520d2..9d2a67050b5 100644
--- a/usr.sbin/ppp/ppp/ppp.8
+++ b/usr.sbin/ppp/ppp/ppp.8
@@ -1,4 +1,4 @@
-.\" $Id: ppp.8,v 1.44 1999/06/01 08:46:43 brian Exp $
+.\" $Id: ppp.8,v 1.45 1999/06/02 00:46:55 brian Exp $
 .Dd 20 September 1995
 .nr XX \w'\fC00'
 .Os
@@ -2473,6 +2473,41 @@ field, reporting the fact at the respective log level.  If
 is disabled,
 .Nm
 will ignore the identifier field.
+.It keep-session
+Default: Disabled.  When
+.Nm
+runs as a Multi-link server, a different
+.Nm
+instance initially receives each connection.  After determining that
+the link belongs to an already existing bundle (controlled by another
+.Nm
+invocation),
+.Nm
+will transfer the link to that process.
+.Pp
+If the link is a tty device or if this option is enabled,
+.Nm
+will not exit, but will change its process name to
+.Dq session owner
+and wait for the controlling
+.Nm
+to finish with the link and deliver a signal back to the idle process.
+This prevents the confusion that results from
+.Nm ppp Ns No 's
+parent considering the link resource available again.
+.Pp
+For tty devices that have entries in
+.Pa /etc/ttys ,
+this is necessary to prevent another
+.Xr getty 8
+from being started, and for program links such as
+.Xr sshd 8 ,
+it prevents
+.Xr sshd 8
+from exiting due to the death of its child.  As
+.Nm
+cannot determine its parents requirements (except for the tty case), this
+option must be enabled manually depending on the circumstances.
 .It loopback
 Default: Enabled.  When
 .Ar loopback
@@ -4535,6 +4570,7 @@ This socket is used to pass links between different instances of
 .Xr pppctl 8 ,
 .Xr pppd 8 ,
 .Xr route 8 ,
+.Xr sshd 8 ,
 .Xr syslogd 8 ,
 .Xr traceroute 8 ,
 .Xr vipw 8