+static void
+client_input_agent_open(int type, u_int32_t seq, void *ctxt)
+{
+ Channel *c = NULL;
+ int remote_id, sock;
+
+ /* Read the remote channel number from the message. */
+ remote_id = packet_get_int();
+ packet_check_eom();
+
+ /*
+ * Get a connection to the local authentication agent (this may again
+ * get forwarded).
+ */
+ sock = ssh_get_authentication_socket();
+
+ /*
+ * If we could not connect the agent, send an error message back to
+ * the server. This should never happen unless the agent dies,
+ * because authentication forwarding is only enabled if we have an
+ * agent.
+ */
+ if (sock >= 0) {
+ c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
+ -1, 0, 0, 0, "authentication agent connection", 1);
+ c->remote_id = remote_id;
+ c->force_drain = 1;
+ }
+ if (c == NULL) {
+ packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+ packet_put_int(remote_id);
+ } else {
+ /* Send a confirmation to the remote host. */
+ debug("Forwarding authentication connection.");
+ packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
+ packet_put_int(remote_id);
+ packet_put_int(c->self);
+ }
+ packet_send();
+}
+
+static Channel *
+client_request_forwarded_tcpip(const char *request_type, int rchan)
+{
+ Channel *c = NULL;
+ char *listen_address, *originator_address;
+ int listen_port, originator_port;
+ int sock;
+
+ /* Get rest of the packet */
+ listen_address = packet_get_string(NULL);
+ listen_port = packet_get_int();
+ originator_address = packet_get_string(NULL);
+ originator_port = packet_get_int();
+ packet_check_eom();
+
+ debug("client_request_forwarded_tcpip: listen %s port %d, originator %s port %d",
+ listen_address, listen_port, originator_address, originator_port);
+
+ sock = channel_connect_by_listen_address(listen_port);
+ if (sock < 0) {
+ xfree(originator_address);
+ xfree(listen_address);
+ return NULL;
+ }
+ c = channel_new("forwarded-tcpip",
+ SSH_CHANNEL_CONNECTING, sock, sock, -1,
+ CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
+ originator_address, 1);
+ xfree(originator_address);
+ xfree(listen_address);
+ return c;
+}
+
+static Channel *
+client_request_x11(const char *request_type, int rchan)
+{
+ Channel *c = NULL;
+ char *originator;
+ int originator_port;
+ int sock;
+
+ if (!options.forward_x11) {
+ error("Warning: ssh server tried X11 forwarding.");
+ error("Warning: this is probably a break in attempt by a malicious server.");
+ return NULL;
+ }
+ originator = packet_get_string(NULL);
+ if (datafellows & SSH_BUG_X11FWD) {
+ debug2("buggy server: x11 request w/o originator_port");
+ originator_port = 0;
+ } else {
+ originator_port = packet_get_int();
+ }
+ packet_check_eom();
+ /* XXX check permission */
+ debug("client_request_x11: request from %s %d", originator,
+ originator_port);
+ xfree(originator);
+ sock = x11_connect_display();
+ if (sock < 0)
+ return NULL;
+ c = channel_new("x11",
+ SSH_CHANNEL_X11_OPEN, sock, sock, -1,
+ CHAN_TCP_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, 0, "x11", 1);
+ c->force_drain = 1;
+ return c;
+}
+
+static Channel *
+client_request_agent(const char *request_type, int rchan)
+{
+ Channel *c = NULL;
+ int sock;
+
+ if (!options.forward_agent) {
+ error("Warning: ssh server tried agent forwarding.");
+ error("Warning: this is probably a break in attempt by a malicious server.");
+ return NULL;
+ }
+ sock = ssh_get_authentication_socket();
+ if (sock < 0)
+ return NULL;
+ c = channel_new("authentication agent connection",
+ SSH_CHANNEL_OPEN, sock, sock, -1,
+ CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
+ "authentication agent connection", 1);
+ c->force_drain = 1;
+ return c;
+}