www.nico.schottelius.org/blog/openssh-6.2-add-callback-functionality-using-dynamic-remote-port-forwarding/openssh-6.2p1-expose-remote-port-forwarding.diff
Nico Schottelius 0264bb72fb ++dynamic port forwarding patch + blog entry
Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>
2013-05-15 23:29:34 +02:00

82 lines
2.3 KiB
Diff

diff -ru openssh-6.2p1/channels.c openssh-6.2p1.patched/channels.c
--- openssh-6.2p1/channels.c 2012-12-02 23:50:55.000000000 +0100
+++ openssh-6.2p1.patched/channels.c 2013-05-15 23:26:17.119989982 +0200
@@ -2865,6 +2865,52 @@
return success;
}
+/*
+ * Write list of remote forwarding ports into an existing buffer
+ */
+void
+channel_list_rport_listener(char *buf, size_t size)
+{
+ u_int i, j, num_ports = 0;
+ int offset = 0;
+ int *ports;
+ int skip;
+
+ ports = xcalloc(channels_alloc, sizeof(int));
+
+ for (i = 0; i < channels_alloc; i++) {
+ skip = 0;
+ Channel *c = channels[i];
+ if (c == NULL || c->type != SSH_CHANNEL_RPORT_LISTENER)
+ continue;
+
+ /* Skip already added ports - IPv4 + IPv6 == same port twice */
+ for(j = 0; j < num_ports; j++) {
+ if (ports[j] == c->listening_port) {
+ skip = 1;
+ break;
+ }
+ }
+
+ if(skip) continue;
+
+ ports[num_ports] = c->listening_port;
+ num_ports++;
+
+ if(!offset) {
+ offset += snprintf(&buf[offset], size - offset, "%d", c->listening_port);
+ } else
+ offset += snprintf(&buf[offset], size - offset, " %d", c->listening_port);
+
+ if(offset >= size) {
+ error("Exceeded buffer space for remote forwarding ports listing");
+ break;
+ }
+ }
+
+ xfree(ports);
+}
+
int
channel_cancel_rport_listener(const char *host, u_short port)
{
Only in openssh-6.2p1.patched/: .channels.c.swp
diff -ru openssh-6.2p1/channels.h openssh-6.2p1.patched/channels.h
--- openssh-6.2p1/channels.h 2012-04-22 03:21:10.000000000 +0200
+++ openssh-6.2p1.patched/channels.h 2013-05-09 23:21:37.385423623 +0200
@@ -222,6 +222,7 @@
void channel_cancel_cleanup(int);
int channel_close_fd(int *);
void channel_send_window_changes(void);
+void channel_list_rport_listener(char *buf, size_t size);
/* protocol handler */
diff -ru openssh-6.2p1/session.c openssh-6.2p1.patched/session.c
--- openssh-6.2p1/session.c 2013-03-15 01:22:37.000000000 +0100
+++ openssh-6.2p1.patched/session.c 2013-05-15 23:27:12.459989713 +0200
@@ -1235,6 +1235,9 @@
xfree(laddr);
child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
+ channel_list_rport_listener(buf, sizeof buf);
+ child_set_env(&env, &envsize, "SSH_REMOTE_FORWARDING_PORTS", buf);
+
if (s->ttyfd != -1)
child_set_env(&env, &envsize, "SSH_TTY", s->tty);
if (s->term)
Only in openssh-6.2p1.patched/: .session.c.swp