From 5589f4b55f6f739acb8a2ff616d54e919e01dba9 Mon Sep 17 00:00:00 2001
From: Ben Lindstrom <mouring@eviladmin.org>
Date: Fri, 22 Mar 2002 03:24:32 +0000
Subject:    - jakob@cvs.openbsd.org 2002/03/21 15:17:26      [clientloop.c
 ssh.1]      add built-in command line for adding new port forwardings on the
 fly.      based on a patch from brian wellington. ok markus@.

---
 ChangeLog    |  6 ++++-
 clientloop.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 ssh.1        |  8 ++++++-
 3 files changed, 88 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 307e20e14..b2e46a68c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -111,6 +111,10 @@
      [ssh-add.c]
      ignore errors for nonexisting default keys in ssh-add,
      fixes http://bugzilla.mindrot.org/show_bug.cgi?id=158
+   - jakob@cvs.openbsd.org 2002/03/21 15:17:26
+     [clientloop.c ssh.1]
+     add built-in command line for adding new port forwardings on the fly.
+     based on a patch from brian wellington. ok markus@.
 
 20020317
  - (tim) [configure.ac] Assume path given with --with-pid-dir=PATH is wanted,
@@ -7957,4 +7961,4 @@
  - Wrote replacements for strlcpy and mkdtemp
  - Released 1.0pre1
 
-$Id: ChangeLog,v 1.1956 2002/03/22 03:21:16 mouring Exp $
+$Id: ChangeLog,v 1.1957 2002/03/22 03:24:32 mouring Exp $
diff --git a/clientloop.c b/clientloop.c
index 65a6682a6..7259959ee 100644
--- a/clientloop.c
+++ b/clientloop.c
@@ -59,7 +59,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: clientloop.c,v 1.96 2002/02/06 14:55:15 markus Exp $");
+RCSID("$OpenBSD: clientloop.c,v 1.97 2002/03/21 15:17:26 jakob Exp $");
 
 #include "ssh.h"
 #include "ssh1.h"
@@ -81,6 +81,7 @@ RCSID("$OpenBSD: clientloop.c,v 1.96 2002/02/06 14:55:15 markus Exp $");
 #include "atomicio.h"
 #include "sshtty.h"
 #include "misc.h"
+#include "readpass.h"
 
 /* import options */
 extern Options options;
@@ -470,6 +471,75 @@ client_process_net_input(fd_set * readset)
 	}
 }
 
+static void
+process_cmdline(Buffer *bin, Buffer *bout, Buffer *berr)
+{
+	char string[1024];
+	void (*handler)(int);
+	char *s, *cmd;
+	u_short fwd_port, fwd_host_port;
+	char buf[1024], sfwd_port[6], sfwd_host_port[6];
+	int local = 0;
+	int n;
+
+	leave_raw_mode();
+ 	handler = signal(SIGINT, SIG_IGN);
+	s = read_passphrase("\r\nssh> ", RP_ECHO);
+	if (s == NULL)
+		goto out;
+	cmd = s;
+
+	while (*s && isspace(*s))
+		s++;
+
+	if (*s == 0)
+		goto out;
+
+	if (strlen(s) < 2 || s[0] != '-' || !(s[1] == 'L' || s[1] == 'R')) {
+		log("Invalid command");
+		goto out;
+	}
+	if (s[1] == 'L')
+		local = 1;
+	if (!local && !compat20) {
+		log("Not supported for SSH protocol version 1");
+		goto out;
+	}
+
+	s += 2;
+	while (*s && isspace(*s))
+		s++;
+
+	if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]",
+	    sfwd_port, buf, sfwd_host_port) != 3 &&
+	    sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]",
+	    sfwd_port, buf, sfwd_host_port) != 3) {
+		log("Bad forwarding specification");
+		goto out;
+	}
+	if ((fwd_port = a2port(sfwd_port)) == 0 ||
+	    (fwd_host_port = a2port(sfwd_host_port)) == 0) {
+		log("Bad forwarding port(s)");
+		goto out;
+	}
+	if (local) {
+		n = channel_setup_local_fwd_listener(fwd_port, buf,
+		    fwd_host_port, options.gateway_ports);
+		if (n <= 0) {
+			log("Port forwarding failed");
+			goto out;
+		}
+	} else
+		channel_request_remote_forwarding(fwd_port, buf,
+		    fwd_host_port);
+	log("Forwarding port");
+out:
+	signal(SIGINT, handler);
+	enter_raw_mode();
+	if (cmd)
+		xfree(cmd);
+}
+
 /* process the characters one by one */
 static int
 process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
@@ -574,6 +644,7 @@ process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
 "%c?\r\n\
 Supported escape sequences:\r\n\
 ~.  - terminate connection\r\n\
+~C  - open a command line\r\n\
 ~R  - Request rekey (SSH protocol 2 only)\r\n\
 ~^Z - suspend ssh\r\n\
 ~#  - list forwarded connections\r\n\
@@ -593,6 +664,10 @@ Supported escape sequences:\r\n\
 				xfree(s);
 				continue;
 
+			case 'C':
+				process_cmdline(bin, bout, berr);
+				continue;
+
 			default:
 				if (ch != escape_char) {
 					buffer_put_char(bin, escape_char);
diff --git a/ssh.1 b/ssh.1
index 43b75dc23..dc7fa2915 100644
--- a/ssh.1
+++ b/ssh.1
@@ -34,7 +34,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $OpenBSD: ssh.1,v 1.148 2002/02/18 17:55:20 markus Exp $
+.\" $OpenBSD: ssh.1,v 1.149 2002/03/21 15:17:26 jakob Exp $
 .Dd September 25, 1999
 .Dt SSH 1
 .Os
@@ -297,6 +297,12 @@ Background ssh at logout when waiting for forwarded connection / X11 sessions
 to terminate
 .It Cm ~?
 Display a list of escape characters
+.It Cm ~C
+Open command line (only useful for adding port forwardings using the
+.Fl L
+and
+.Fl R
+options)
 .It Cm ~R
 Request rekeying of the connection (only useful for SSH protocol version 2
 and if the peer supports it)
-- 
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