upstream commit

Expose devices allocated for tun/tap forwarding.

At the client, the device may be obtained from a new %T expansion
for LocalCommand.

At the server, the allocated devices will be listed in a
SSH_TUNNEL variable exposed to the environment of any user sessions
started after the tunnel forwarding was established.

ok markus

Upstream-ID: e61e53f8ae80566e9ddc0d67a5df5bdf2f3c9f9e

1 files changed, 9 insertions, 3 deletions

diff --git a/misc.c b/misc.c
index d4d0e44a5..7f1d42567 100644
--- a/misc.c
+++ b/misc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: misc.c,v 1.114 2017/10/21 23:06:24 millert Exp $ */
+/* $OpenBSD: misc.c,v 1.115 2017/10/23 05:08:00 djm Exp $ */
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  * Copyright (c) 2005,2006 Damien Miller.  All rights reserved.
@@ -964,16 +964,19 @@ read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
 }
 
 int
-tun_open(int tun, int mode)
+tun_open(int tun, int mode, char **ifname)
 {
 #if defined(CUSTOM_SYS_TUN_OPEN)
-        return (sys_tun_open(tun, mode));
+        return (sys_tun_open(tun, mode, ifname));
 #elif defined(SSH_TUN_OPENBSD)
         struct ifreq ifr;
         char name[100];
         int fd = -1, sock;
         const char *tunbase = "tun";
 
+        if (ifname != NULL)
+                *ifname = NULL;
+
         if (mode == SSH_TUNMODE_ETHERNET)
                 tunbase = "tap";
 
@@ -1020,6 +1023,9 @@ tun_open(int tun, int mode)
                 }
         }
 
+        if (ifname != NULL)
+                *ifname = xstrdup(ifr.ifr_name);
+
         close(sock);
         return fd;