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-rw-r--r--occ.c393
1 files changed, 0 insertions, 393 deletions
diff --git a/occ.c b/occ.c
deleted file mode 100644
index b84b18d..0000000
--- a/occ.c
+++ /dev/null
@@ -1,393 +0,0 @@
-/*
- * OpenVPN -- An application to securely tunnel IP networks
- * over a single TCP/UDP port, with support for SSL/TLS-based
- * session authentication and key exchange,
- * packet encryption, packet authentication, and
- * packet compression.
- *
- * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program (see the file COPYING included with this
- * distribution); if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#include "syshead.h"
-
-#ifdef ENABLE_OCC
-
-#include "occ.h"
-
-#include "memdbg.h"
-
-#include "forward-inline.h"
-#include "occ-inline.h"
-
-/*
- * This random string identifies an OpenVPN
- * Configuration Control packet.
- * It should be of sufficient length and randomness
- * so as not to collide with other tunnel data.
- *
- * The OCC protocol is as follows:
- *
- * occ_magic -- (16 octets)
- *
- * type [OCC_REQUEST | OCC_REPLY] (1 octet)
- * null terminated options string if OCC_REPLY (variable)
- *
- * When encryption is used, the OCC packet
- * is encapsulated within the encrypted
- * envelope.
- *
- * OCC_STRING_SIZE must be set to sizeof (occ_magic)
- */
-
-const uint8_t occ_magic[] = {
- 0x28, 0x7f, 0x34, 0x6b, 0xd4, 0xef, 0x7a, 0x81,
- 0x2d, 0x56, 0xb8, 0xd3, 0xaf, 0xc5, 0x45, 0x9c
-};
-
-static const struct mtu_load_test mtu_load_test_sequence[] = {
-
- {OCC_MTU_LOAD_REQUEST, -1000},
- {OCC_MTU_LOAD, -1000},
- {OCC_MTU_LOAD_REQUEST, -1000},
- {OCC_MTU_LOAD, -1000},
- {OCC_MTU_LOAD_REQUEST, -1000},
- {OCC_MTU_LOAD, -1000},
-
- {OCC_MTU_LOAD_REQUEST, -750},
- {OCC_MTU_LOAD, -750},
- {OCC_MTU_LOAD_REQUEST, -750},
- {OCC_MTU_LOAD, -750},
- {OCC_MTU_LOAD_REQUEST, -750},
- {OCC_MTU_LOAD, -750},
-
- {OCC_MTU_LOAD_REQUEST, -500},
- {OCC_MTU_LOAD, -500},
- {OCC_MTU_LOAD_REQUEST, -500},
- {OCC_MTU_LOAD, -500},
- {OCC_MTU_LOAD_REQUEST, -500},
- {OCC_MTU_LOAD, -500},
-
- {OCC_MTU_LOAD_REQUEST, -400},
- {OCC_MTU_LOAD, -400},
- {OCC_MTU_LOAD_REQUEST, -400},
- {OCC_MTU_LOAD, -400},
- {OCC_MTU_LOAD_REQUEST, -400},
- {OCC_MTU_LOAD, -400},
-
- {OCC_MTU_LOAD_REQUEST, -300},
- {OCC_MTU_LOAD, -300},
- {OCC_MTU_LOAD_REQUEST, -300},
- {OCC_MTU_LOAD, -300},
- {OCC_MTU_LOAD_REQUEST, -300},
- {OCC_MTU_LOAD, -300},
-
- {OCC_MTU_LOAD_REQUEST, -200},
- {OCC_MTU_LOAD, -200},
- {OCC_MTU_LOAD_REQUEST, -200},
- {OCC_MTU_LOAD, -200},
- {OCC_MTU_LOAD_REQUEST, -200},
- {OCC_MTU_LOAD, -200},
-
- {OCC_MTU_LOAD_REQUEST, -150},
- {OCC_MTU_LOAD, -150},
- {OCC_MTU_LOAD_REQUEST, -150},
- {OCC_MTU_LOAD, -150},
- {OCC_MTU_LOAD_REQUEST, -150},
- {OCC_MTU_LOAD, -150},
-
- {OCC_MTU_LOAD_REQUEST, -100},
- {OCC_MTU_LOAD, -100},
- {OCC_MTU_LOAD_REQUEST, -100},
- {OCC_MTU_LOAD, -100},
- {OCC_MTU_LOAD_REQUEST, -100},
- {OCC_MTU_LOAD, -100},
-
- {OCC_MTU_LOAD_REQUEST, -50},
- {OCC_MTU_LOAD, -50},
- {OCC_MTU_LOAD_REQUEST, -50},
- {OCC_MTU_LOAD, -50},
- {OCC_MTU_LOAD_REQUEST, -50},
- {OCC_MTU_LOAD, -50},
-
- {OCC_MTU_LOAD_REQUEST, 0},
- {OCC_MTU_LOAD, 0},
- {OCC_MTU_LOAD_REQUEST, 0},
- {OCC_MTU_LOAD, 0},
- {OCC_MTU_LOAD_REQUEST, 0},
- {OCC_MTU_LOAD, 0},
-
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
- {OCC_MTU_REQUEST, 0},
-
- {-1, 0}
-};
-
-void
-check_send_occ_req_dowork (struct context *c)
-{
- if (++c->c2.occ_n_tries >= OCC_N_TRIES)
- {
- if (c->options.ce.remote)
- /*
- * No OCC_REPLY from peer after repeated attempts.
- * Give up.
- */
- msg (D_SHOW_OCC,
- "NOTE: failed to obtain options consistency info from peer -- "
- "this could occur if the remote peer is running a version of "
- PACKAGE_NAME
- " before 1.5-beta8 or if there is a network connectivity problem, and will not necessarily prevent "
- PACKAGE_NAME
- " from running (" counter_format " bytes received from peer, " counter_format
- " bytes authenticated data channel traffic) -- you can disable the options consistency "
- "check with --disable-occ.",
- c->c2.link_read_bytes,
- c->c2.link_read_bytes_auth);
- event_timeout_clear (&c->c2.occ_interval);
- }
- else
- {
- c->c2.occ_op = OCC_REQUEST;
-
- /*
- * If we don't hear back from peer, send another
- * OCC_REQUEST in OCC_INTERVAL_SECONDS.
- */
- event_timeout_reset (&c->c2.occ_interval);
- }
-}
-
-void
-check_send_occ_load_test_dowork (struct context *c)
-{
- if (CONNECTION_ESTABLISHED (c))
- {
- const struct mtu_load_test *entry;
-
- if (!c->c2.occ_mtu_load_n_tries)
- msg (M_INFO,
- "NOTE: Beginning empirical MTU test -- results should be available in 3 to 4 minutes.");
-
- entry = &mtu_load_test_sequence[c->c2.occ_mtu_load_n_tries++];
- if (entry->op >= 0)
- {
- c->c2.occ_op = entry->op;
- c->c2.occ_mtu_load_size =
- EXPANDED_SIZE (&c->c2.frame) + entry->delta;
- }
- else
- {
- msg (M_INFO,
- "NOTE: failed to empirically measure MTU (requires " PACKAGE_NAME " 1.5 or higher at other end of connection).");
- event_timeout_clear (&c->c2.occ_mtu_load_test_interval);
- c->c2.occ_mtu_load_n_tries = 0;
- }
- }
-}
-
-void
-check_send_occ_msg_dowork (struct context *c)
-{
- bool doit = false;
-
- c->c2.buf = c->c2.buffers->aux_buf;
- ASSERT (buf_init (&c->c2.buf, FRAME_HEADROOM (&c->c2.frame)));
- ASSERT (buf_safe (&c->c2.buf, MAX_RW_SIZE_TUN (&c->c2.frame)));
- ASSERT (buf_write (&c->c2.buf, occ_magic, OCC_STRING_SIZE));
-
- switch (c->c2.occ_op)
- {
- case OCC_REQUEST:
- if (!buf_write_u8 (&c->c2.buf, OCC_REQUEST))
- break;
- dmsg (D_PACKET_CONTENT, "SENT OCC_REQUEST");
- doit = true;
- break;
-
- case OCC_REPLY:
- if (!c->c2.options_string_local)
- break;
- if (!buf_write_u8 (&c->c2.buf, OCC_REPLY))
- break;
- if (!buf_write (&c->c2.buf, c->c2.options_string_local,
- strlen (c->c2.options_string_local) + 1))
- break;
- dmsg (D_PACKET_CONTENT, "SENT OCC_REPLY");
- doit = true;
- break;
-
- case OCC_MTU_REQUEST:
- if (!buf_write_u8 (&c->c2.buf, OCC_MTU_REQUEST))
- break;
- dmsg (D_PACKET_CONTENT, "SENT OCC_MTU_REQUEST");
- doit = true;
- break;
-
- case OCC_MTU_REPLY:
- if (!buf_write_u8 (&c->c2.buf, OCC_MTU_REPLY))
- break;
- if (!buf_write_u16 (&c->c2.buf, c->c2.max_recv_size_local))
- break;
- if (!buf_write_u16 (&c->c2.buf, c->c2.max_send_size_local))
- break;
- dmsg (D_PACKET_CONTENT, "SENT OCC_MTU_REPLY");
- doit = true;
- break;
-
- case OCC_MTU_LOAD_REQUEST:
- if (!buf_write_u8 (&c->c2.buf, OCC_MTU_LOAD_REQUEST))
- break;
- if (!buf_write_u16 (&c->c2.buf, c->c2.occ_mtu_load_size))
- break;
- dmsg (D_PACKET_CONTENT, "SENT OCC_MTU_LOAD_REQUEST");
- doit = true;
- break;
-
- case OCC_MTU_LOAD:
- {
- int need_to_add;
-
- if (!buf_write_u8 (&c->c2.buf, OCC_MTU_LOAD))
- break;
- need_to_add = min_int (c->c2.occ_mtu_load_size, EXPANDED_SIZE (&c->c2.frame))
- - OCC_STRING_SIZE
- - sizeof (uint8_t)
- - EXTRA_FRAME (&c->c2.frame);
-
- while (need_to_add > 0)
- {
- /*
- * Fill the load test packet with pseudo-random bytes.
- */
- if (!buf_write_u8 (&c->c2.buf, get_random () & 0xFF))
- break;
- --need_to_add;
- }
- dmsg (D_PACKET_CONTENT, "SENT OCC_MTU_LOAD min_int(%d-%d-%d-%d,%d) size=%d",
- c->c2.occ_mtu_load_size,
- OCC_STRING_SIZE,
- (int) sizeof (uint8_t),
- EXTRA_FRAME (&c->c2.frame),
- MAX_RW_SIZE_TUN (&c->c2.frame),
- BLEN (&c->c2.buf));
- doit = true;
- }
- break;
-
- case OCC_EXIT:
- if (!buf_write_u8 (&c->c2.buf, OCC_EXIT))
- break;
- dmsg (D_PACKET_CONTENT, "SENT OCC_EXIT");
- doit = true;
- break;
- }
-
- if (doit)
- {
- /*
- * We will treat the packet like any other outgoing packet,
- * compress, encrypt, sign, etc.
- */
- encrypt_sign (c, true);
- }
-
- c->c2.occ_op = -1;
-}
-
-void
-process_received_occ_msg (struct context *c)
-{
- ASSERT (buf_advance (&c->c2.buf, OCC_STRING_SIZE));
- switch (buf_read_u8 (&c->c2.buf))
- {
- case OCC_REQUEST:
- dmsg (D_PACKET_CONTENT, "RECEIVED OCC_REQUEST");
- c->c2.occ_op = OCC_REPLY;
- break;
-
- case OCC_MTU_REQUEST:
- dmsg (D_PACKET_CONTENT, "RECEIVED OCC_MTU_REQUEST");
- c->c2.occ_op = OCC_MTU_REPLY;
- break;
-
- case OCC_MTU_LOAD_REQUEST:
- dmsg (D_PACKET_CONTENT, "RECEIVED OCC_MTU_LOAD_REQUEST");
- c->c2.occ_mtu_load_size = buf_read_u16 (&c->c2.buf);
- if (c->c2.occ_mtu_load_size >= 0)
- c->c2.occ_op = OCC_MTU_LOAD;
- break;
-
- case OCC_REPLY:
- dmsg (D_PACKET_CONTENT, "RECEIVED OCC_REPLY");
- if (c->options.occ && !TLS_MODE (c) && c->c2.options_string_remote)
- {
- if (!options_cmp_equal_safe ((char *) BPTR (&c->c2.buf),
- c->c2.options_string_remote,
- c->c2.buf.len))
- {
- options_warning_safe ((char *) BPTR (&c->c2.buf),
- c->c2.options_string_remote,
- c->c2.buf.len);
- }
- }
- event_timeout_clear (&c->c2.occ_interval);
- break;
-
- case OCC_MTU_REPLY:
- dmsg (D_PACKET_CONTENT, "RECEIVED OCC_MTU_REPLY");
- c->c2.max_recv_size_remote = buf_read_u16 (&c->c2.buf);
- c->c2.max_send_size_remote = buf_read_u16 (&c->c2.buf);
- if (c->options.mtu_test
- && c->c2.max_recv_size_remote > 0
- && c->c2.max_send_size_remote > 0)
- {
- msg (M_INFO, "NOTE: Empirical MTU test completed [Tried,Actual] local->remote=[%d,%d] remote->local=[%d,%d]",
- c->c2.max_send_size_local,
- c->c2.max_recv_size_remote,
- c->c2.max_send_size_remote,
- c->c2.max_recv_size_local);
- if (!c->options.fragment
- && c->options.ce.proto == PROTO_UDPv4
- && c->c2.max_send_size_local > TUN_MTU_MIN
- && (c->c2.max_recv_size_remote < c->c2.max_send_size_local
- || c->c2.max_recv_size_local < c->c2.max_send_size_remote))
- msg (M_INFO, "NOTE: This connection is unable to accomodate a UDP packet size of %d. Consider using --fragment or --mssfix options as a workaround.",
- c->c2.max_send_size_local);
- }
- event_timeout_clear (&c->c2.occ_mtu_load_test_interval);
- break;
-
- case OCC_EXIT:
- dmsg (D_PACKET_CONTENT, "RECEIVED OCC_EXIT");
- c->sig->signal_received = SIGTERM;
- c->sig->signal_text = "remote-exit";
- break;
- }
- c->c2.buf.len = 0; /* don't pass packet on */
-}
-
-#else
-static void dummy(void) {}
-#endif
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