- 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@.

1 files changed, 76 insertions, 1 deletions

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);