ppp: Reject unknown protocols

NX won't send any IPCP requests until CCP negotiation is completed.
Since we don't want to implement compression for now (or ever), reject
unknown protocols with an LCP Protocol-Reject (cf. RFC 1661, ch. 5.7).

Signed-off-by: Andreas Gnau <rondom@rondom.de>

diff --git a/ppp.c b/ppp.c
index 5186b1c1de80a846d721dc12e93a0c3bccc78185..1a2a6b4ff9ee2b0b69b56a17aa3bf1d68d29782d 100644 (file)
--- a/ppp.c
+++ b/ppp.c
@@ -1087,7 +1087,9 @@ int ppp_mainloop(struct openconnect_info *vpninfo, int *timeout, int readable)
                                     _("PPP packet with unknown protocol 0x%04x. Payload:\n"),
                                     proto);
                        dump_buf_hex(vpninfo, PRG_ERR, '<', pp, payload_len);
-                       return 1;
+                       if (queue_config_packet(vpninfo, PPP_LCP, ++ppp->lcp.id, PROTREJ, payload_len + (pp - ph), ph))
+                               vpn_progress(vpninfo, PRG_ERR,
+                                            _("Failed queuing Protocol-Reject for unknown protocol 0x%04x.\n"), proto);
                }
 
                if (next_len) {