1 files changed, 85 insertions, 3 deletions

diff --git a/serverloop.c b/serverloop.c
index 031847873..f72b73bf8 100644
--- a/serverloop.c
+++ b/serverloop.c
@@ -35,7 +35,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: serverloop.c,v 1.118 2005/07/17 07:17:55 djm Exp $");
+RCSID("$OpenBSD: serverloop.c,v 1.124 2005/12/13 15:03:02 reyk Exp $");
 
 #include "xmalloc.h"
 #include "packet.h"
@@ -61,6 +61,7 @@ extern ServerOptions options;
 /* XXX */
 extern Kex *xxx_kex;
 extern Authctxt *the_authctxt;
+extern int use_privsep;
 
 static Buffer stdin_buffer;     /* Buffer for stdin data. */
 static Buffer stdout_buffer;    /* Buffer for stdout data. */
@@ -90,6 +91,9 @@ static int client_alive_timeouts = 0;
 
 static volatile sig_atomic_t child_terminated = 0;      /* The child has terminated. */
 
+/* Cleanup on signals (!use_privsep case only) */
+static volatile sig_atomic_t received_sigterm = 0;
+
 /* prototypes */
 static void server_init_dispatch(void);
 
@@ -151,6 +155,12 @@ sigchld_handler(int sig)
         errno = save_errno;
 }
 
+static void
+sigterm_handler(int sig)
+{
+        received_sigterm = sig;
+}
+
 /*
  * Make packets from buffered stderr data, and buffer it for sending
  * to the client.
@@ -502,6 +512,12 @@ server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
         child_terminated = 0;
         mysignal(SIGCHLD, sigchld_handler);
 
+        if (!use_privsep) {
+                signal(SIGTERM, sigterm_handler);
+                signal(SIGINT, sigterm_handler);
+                signal(SIGQUIT, sigterm_handler);
+        }
+
         /* Initialize our global variables. */
         fdin = fdin_arg;
         fdout = fdout_arg;
@@ -548,7 +564,7 @@ server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
          * If we have no separate fderr (which is the case when we have a pty
          * - there we cannot make difference between data sent to stdout and
          * stderr), indicate that we have seen an EOF from stderr.  This way
-         * we don\'t need to check the descriptor everywhere.
+         * we don't need to check the descriptor everywhere.
          */
         if (fderr == -1)
                 fderr_eof = 1;
@@ -629,6 +645,12 @@ server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
                 wait_until_can_do_something(&readset, &writeset, &max_fd,
                     &nalloc, max_time_milliseconds);
 
+                if (received_sigterm) {
+                        logit("Exiting on signal %d", received_sigterm);
+                        /* Clean up sessions, utmp, etc. */
+                        cleanup_exit(255);
+                }
+
                 /* Process any channel events. */
                 channel_after_select(readset, writeset);
 
@@ -749,6 +771,12 @@ server_loop2(Authctxt *authctxt)
         connection_in = packet_get_connection_in();
         connection_out = packet_get_connection_out();
 
+        if (!use_privsep) {
+                signal(SIGTERM, sigterm_handler);
+                signal(SIGINT, sigterm_handler);
+                signal(SIGQUIT, sigterm_handler);
+        }
+
         notify_setup();
 
         max_fd = MAX(connection_in, connection_out);
@@ -766,6 +794,12 @@ server_loop2(Authctxt *authctxt)
                 wait_until_can_do_something(&readset, &writeset, &max_fd,
                     &nalloc, 0);
 
+                if (received_sigterm) {
+                        logit("Exiting on signal %d", received_sigterm);
+                        /* Clean up sessions, utmp, etc. */
+                        cleanup_exit(255);
+                }
+
                 collect_children();
                 if (!rekeying) {
                         channel_after_select(readset, writeset);
@@ -880,6 +914,52 @@ server_request_direct_tcpip(void)
 }
 
 static Channel *
+server_request_tun(void)
+{
+        Channel *c = NULL;
+        int mode, tun;
+        int sock;
+
+        mode = packet_get_int();
+        switch (mode) {
+        case SSH_TUNMODE_POINTOPOINT:
+        case SSH_TUNMODE_ETHERNET:
+                break;
+        default:
+                packet_send_debug("Unsupported tunnel device mode.");
+                return NULL;
+        }
+        if ((options.permit_tun & mode) == 0) {
+                packet_send_debug("Server has rejected tunnel device "
+                    "forwarding");
+                return NULL;
+        }
+
+        tun = packet_get_int();
+        if (forced_tun_device != -1) {
+                if (tun != SSH_TUNID_ANY && forced_tun_device != tun)
+                        goto done;
+                tun = forced_tun_device;
+        }
+        sock = tun_open(tun, mode);
+        if (sock < 0)
+                goto done;
+        c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1,
+            CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
+        c->datagram = 1;
+#if defined(SSH_TUN_FILTER)
+        if (mode == SSH_TUNMODE_POINTOPOINT)
+                channel_register_filter(c->self, sys_tun_infilter,
+                    sys_tun_outfilter);
+#endif
+
+ done:
+        if (c == NULL)
+                packet_send_debug("Failed to open the tunnel device.");
+        return c;
+}
+
+static Channel *
 server_request_session(void)
 {
         Channel *c;
@@ -900,7 +980,7 @@ server_request_session(void)
                 channel_free(c);
                 return NULL;
         }
-        channel_register_cleanup(c->self, session_close_by_channel);
+        channel_register_cleanup(c->self, session_close_by_channel, 0);
         return c;
 }
 
@@ -924,6 +1004,8 @@ server_input_channel_open(int type, u_int32_t seq, void *ctxt)
                 c = server_request_session();
         } else if (strcmp(ctype, "direct-tcpip") == 0) {
                 c = server_request_direct_tcpip();
+        } else if (strcmp(ctype, "tun@openssh.com") == 0) {
+                c = server_request_tun();
         }
         if (c != NULL) {
                 debug("server_input_channel_open: confirm %s", ctype);