Attention is currently required from: flichtenheld, mrbff, plaisthos.
Hello flichtenheld, plaisthos, stipa,
I'd like you to reexamine a change. Please visit
http://gerrit.openvpn.net/c/openvpn/+/809?usp=email
to look at the new patch set (#12).
Change subject: PUSH_UPDATE: Added remove_option() and do_update().
......................................................................
PUSH_UPDATE: Added remove_option() and do_update().
* Added remove_option() function and some utility functions to remove options at
runtime following the push-update logic.
* Added do_update() function to close and reopen the tun and apply option
updates.
Change-Id: I507180d7397b6959844a30908010132bc3411067
Signed-off-by: Marco Baffo <ma...@mandelbit.com>
---
M src/openvpn/init.c
M src/openvpn/init.h
M src/openvpn/multi.c
M src/openvpn/options.c
M src/openvpn/push.c
M src/openvpn/route.c
M src/openvpn/route.h
7 files changed, 373 insertions(+), 42 deletions(-)
git pull ssh://gerrit.openvpn.net:29418/openvpn refs/changes/09/809/12
diff --git a/src/openvpn/init.c b/src/openvpn/init.c
index 4ada221..fdbc817 100644
--- a/src/openvpn/init.c
+++ b/src/openvpn/init.c
@@ -2462,7 +2462,7 @@
if (pulled_options)
{
- if (!do_deferred_options(c, option_types_found))
+ if (!do_deferred_options(c, option_types_found, false))
{
msg(D_PUSH_ERRORS, "ERROR: Failed to apply push options");
return false;
@@ -2584,6 +2584,55 @@
return true;
}
+bool
+do_update(struct context *c, unsigned int option_types_found)
+{
+ /* Not necessary since to receive the update the openvpn
+ * instance must be up and running but just in case
+ */
+ if (!c->c2.do_up_ran)
+ {
+ return false;
+ }
+
+ bool tt_dco_win = tuntap_is_dco_win(c->c1.tuntap);
+ if (tt_dco_win)
+ {
+ msg(M_NONFATAL, "dco-win doesn't yet support reopening TUN device");
+ return false;
+ }
+
+ if (!do_deferred_options(c, option_types_found, true))
+ {
+ msg(D_PUSH_ERRORS, "ERROR: Failed to apply push options");
+ return false;
+ }
+
+ do_close_tun(c, true);
+
+ management_sleep(1);
+ int error_flags = 0;
+ c->c2.did_open_tun = do_open_tun(c, &error_flags);
+ update_time();
+
+ if (c->c2.did_open_tun)
+ {
+ /* if --route-delay was specified, start timer */
+ if ((route_order(c->c1.tuntap) == ROUTE_AFTER_TUN) &&
c->options.route_delay_defined)
+ {
+ event_timeout_init(&c->c2.route_wakeup, c->options.route_delay,
now);
+ event_timeout_init(&c->c2.route_wakeup_expire,
c->options.route_delay + c->options.route_delay_window, now);
+ tun_standby_init(c->c1.tuntap);
+ }
+
+ initialization_sequence_completed(c, error_flags);
+ }
+
+ CLEAR(c->c1.pulled_options_digest_save);
+
+ return true;
+}
+
/*
* These are the option categories which will be accepted by pull.
*/
@@ -2662,11 +2711,8 @@
return true;
}
-/*
- * Handle non-tun-related pulled options.
- */
bool
-do_deferred_options(struct context *c, const unsigned int found)
+do_deferred_options(struct context *c, const unsigned int found, const bool
is_update)
{
if (found & OPT_P_MESSAGES)
{
@@ -2772,7 +2818,7 @@
/* process (potentially) pushed options */
if (c->options.pull)
{
- if (!check_pull_client_ncp(c, found))
+ if (!is_update && !check_pull_client_ncp(c, found))
{
return false;
}
diff --git a/src/openvpn/init.h b/src/openvpn/init.h
index 11c32ac..77490d8 100644
--- a/src/openvpn/init.h
+++ b/src/openvpn/init.h
@@ -86,13 +86,29 @@
bool pulled_options,
unsigned int option_types_found);
+/**
+ * @brief A simplified version of the do_up() function. This function is called
+ * after receiving a successful PUSH_UPDATE message. It closes and
reopens
+ * the TUN device to apply the updated options.
+ *
+ * @param c The context structure.
+ * @param option_types_found The options found in the PUSH_UPDATE message.
+ * @return true on success.
+ * @return false on error.
+ */
+bool do_update(struct context *c, unsigned int option_types_found);
+
unsigned int pull_permission_mask(const struct context *c);
const char *format_common_name(struct context *c, struct gc_arena *gc);
void reset_coarse_timers(struct context *c);
-bool do_deferred_options(struct context *c, const unsigned int found);
+/*
+ * Handle non-tun-related pulled options.
+ * Set `is_update` param to true to skip NCP check.
+ */
+bool do_deferred_options(struct context *c, const unsigned int found, const
bool is_update);
void inherit_context_child(struct context *dest,
const struct context *src,
diff --git a/src/openvpn/multi.c b/src/openvpn/multi.c
index f426b46..5b693f9 100644
--- a/src/openvpn/multi.c
+++ b/src/openvpn/multi.c
@@ -2411,7 +2411,7 @@
/*
* Process sourced options.
*/
- do_deferred_options(&mi->context, option_types_found);
+ do_deferred_options(&mi->context, option_types_found, false);
/*
* make sure we got ifconfig settings from somewhere
diff --git a/src/openvpn/options.c b/src/openvpn/options.c
index b05135f..7e38d2c 100644
--- a/src/openvpn/options.c
+++ b/src/openvpn/options.c
@@ -1055,6 +1055,40 @@
gc_free(&gc);
}
}
+
+static void
+delete_all_dhcp_fo(struct options *o, struct env_item **list)
+{
+ struct env_item *current, *prev;
+
+ ASSERT(list);
+
+ for (current = *list, prev = NULL; current != NULL; current =
current->next)
+ {
+ char *tmp_value = NULL;
+ if (!strncmp(current->string, "foreign_option_",
sizeof("foreign_option_")-1))
+ {
+ tmp_value = strchr(current->string, '=');
+ if (tmp_value && ++tmp_value)
+ {
+ if (!strncmp(tmp_value, "dhcp-option ", sizeof("dhcp-option
")-1))
+ {
+ if (prev)
+ {
+ prev->next = current->next;
+ }
+ else
+ {
+ *list = current->next;
+ }
+ o->foreign_option_index--;
+ }
+ }
+ }
+ prev = current;
+ }
+}
+
#endif /* ifndef _WIN32 */
static in_addr_t
@@ -3260,8 +3294,16 @@
msg(M_INFO, "Flag 'def1' added to --redirect-gateway (iservice is in
use)");
opt->routes->flags |= RG_DEF1;
}
+ else if (opt->routes
+ && ((opt->route_method != ROUTE_METHOD_SERVICE)
+ || !(opt->routes->flags & RG_REROUTE_GW))
+ && (opt->routes->flags & RG_DEF1))
+ {
+ msg(M_INFO, "Flag 'def1' removed from --redirect-gateway");
+ opt->routes->flags &= ~RG_DEF1;
+ }
}
-#endif
+#endif /* ifdef _WIN32 */
/*
* Save/Restore certain option defaults before --pull is applied.
@@ -5419,37 +5461,6 @@
}
}
-void
-options_server_import(struct options *o,
- const char *filename,
- int msglevel,
- unsigned int permission_mask,
- unsigned int *option_types_found,
- struct env_set *es)
-{
- msg(D_PUSH, "OPTIONS IMPORT: reading client specific options from: %s",
filename);
- read_config_file(o,
- filename,
- 0,
- filename,
- 0,
- msglevel,
- permission_mask,
- option_types_found,
- es);
-}
-
-void
-options_string_import(struct options *options,
- const char *config,
- const int msglevel,
- const unsigned int permission_mask,
- unsigned int *option_types_found,
- struct env_set *es)
-{
- read_config_string("[CONFIG-STRING]", options, config, msglevel,
permission_mask, option_types_found, es);
-}
-
#define VERIFY_PERMISSION(mask) { \
if (!verify_permission(p[0], file, line, (mask), permission_mask,
\
option_types_found, msglevel, options,
is_inline)) \
@@ -5552,6 +5563,198 @@
return options->forward_compatible ? M_WARN : msglevel;
}
+/**
+ * @brief Resets options found in the PUSH_UPDATE message that are preceded by
the `-` flag.
+ * This function is used in push-updates to reset specified options.
+ * The number of parameters `p` must always be 1. If the permission is
verified,
+ * all related options are erased or reset to their default values.
+ * Upon successful permission verification (by VERIFY_PERMISSION()),
+ * `option_types_found` is filled with the flag corresponding to the
option.
+ *
+ * @param c The context structure.
+ * @param options A pointer to the options structure.
+ * @param p An array of strings containing the options and their parameters.
+ * @param is_inline A boolean indicating if the option is inline.
+ * @param file The file where the function is called.
+ * @param line The line number where the function is called.
+ * @param msglevel The message level.
+ * @param permission_mask The permission mask used by VERIFY_PERMISSION().
+ * @param option_types_found A pointer to the variable where the flags
corresponding to the options found are stored.
+ * @param es The environment set structure.
+ */
+static void
+remove_option(struct context *c,
+ struct options *options,
+ char *p[],
+ bool is_inline,
+ const char *file,
+ int line,
+ const int msglevel,
+ const unsigned int permission_mask,
+ unsigned int *option_types_found,
+ struct env_set *es)
+{
+ int msglevel_fc = msglevel_forward_compatible(options, msglevel);
+
+ if (streq(p[0], "ifconfig") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_UP);
+ options->ifconfig_local = NULL;
+ options->ifconfig_remote_netmask = NULL;
+ }
+ else if (streq(p[0], "ifconfig-ipv6") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_UP);
+ options->ifconfig_ipv6_local = NULL;
+ options->ifconfig_ipv6_netbits = 0;
+ options->ifconfig_ipv6_remote = NULL;
+ }
+ else if (streq(p[0], "route") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_ROUTE);
+ if (c->c1.route_list)
+ {
+ delete_routes_v4(c->c1.route_list, c->c1.tuntap,
+ ROUTE_OPTION_FLAGS(&c->options),
+ es, &c->net_ctx);
+ if (options->routes)
+ {
+ options->routes->routes = NULL;
+ options->routes->flags = 0;
+ }
+ }
+ }
+ else if (streq(p[0], "route-ipv6") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_ROUTE);
+ if (c->c1.route_ipv6_list)
+ {
+ delete_routes_v6(c->c1.route_ipv6_list, c->c1.tuntap,
+ ROUTE_OPTION_FLAGS(&c->options),
+ es, &c->net_ctx);
+ if (options->routes_ipv6)
+ {
+ options->routes_ipv6->routes_ipv6 = NULL;
+ options->routes_ipv6->flags = 0;
+ }
+ }
+ }
+ else if (streq(p[0], "route-gateway") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_ROUTE_EXTRAS);
+ options->route_gateway_via_dhcp = false;
+ options->route_default_gateway = NULL;
+ }
+ else if (streq(p[0], "route-metric") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_ROUTE);
+ options->route_default_metric = 0;
+ }
+ else if (streq(p[0], "push-continuation") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_PULL_MODE);
+ options->push_continuation = 0;
+ }
+ else if ((streq(p[0], "redirect-gateway") || streq(p[0],
"redirect-private")) && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_ROUTE);
+ if (options->routes)
+ {
+ options->routes->flags = 0;
+ }
+ if (options->routes_ipv6)
+ {
+ options->routes_ipv6->flags = 0;
+ }
+ }
+ else if (streq(p[0], "dns") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_DHCPDNS);
+ gc_free(&options->dns_options.gc);
+ CLEAR(options->dns_options);
+ }
+ else if (streq(p[0], "topology") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_UP);
+ options->topology = TOP_UNDEF;
+ helper_setdefault_topology(options);
+ }
+ else if (streq(p[0], "tun-mtu") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_PUSH_MTU|OPT_P_CONNECTION);
+ options->ce.tun_mtu = TUN_MTU_DEFAULT;
+ options->ce.tun_mtu_defined = false;
+ options->ce.occ_mtu = 0;
+ }
+ else if (streq(p[0], "block-ipv6") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_ROUTE);
+ options->block_ipv6 = false;
+ }
+#if defined(_WIN32) || defined(TARGET_ANDROID)
+ else if (streq(p[0], "dhcp-option") && !p[1])
+ {
+ struct tuntap_options *o = &options->tuntap_options;
+ VERIFY_PERMISSION(OPT_P_DHCPDNS);
+
+ o->domain = NULL;
+ o->netbios_scope = NULL;
+ o->netbios_node_type = 0;
+ o->dns6_len = 0;
+ memset(o->dns6, 0, sizeof(o->dns6));
+ o->dns_len = 0;
+ memset(o->dns, 0, sizeof(o->dns));
+ o->wins_len = 0;
+ memset(o->wins, 0, sizeof(o->wins));
+ o->ntp_len = 0;
+ memset(o->ntp, 0, sizeof(o->ntp));
+ o->nbdd_len = 0;
+ memset(o->nbdd, 0, sizeof(o->nbdd));
+ while (o->domain_search_list_len-- > 0)
+ {
+ o->domain_search_list[o->domain_search_list_len] = NULL;
+ }
+ o->disable_nbt = 0;
+ o->dhcp_options = 0;
+#if defined(TARGET_ANDROID)
+ o->http_proxy_port = 0;
+ o->http_proxy = NULL;
+#endif
+ }
+#endif /* if defined(_WIN32) || defined(TARGET_ANDROID) */
+#ifdef _WIN32
+ else if (streq(p[0], "block-outside-dns") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_DHCPDNS);
+ options->block_outside_dns = false;
+ }
+#else /* ifdef _WIN32 */
+ else if (streq(p[0], "dhcp-option") && !p[1])
+ {
+ VERIFY_PERMISSION(OPT_P_DHCPDNS);
+ delete_all_dhcp_fo(options, &es->list);
+ }
+#endif
+ else
+ {
+ int i;
+ int msglevel_unknown = msglevel_fc;
+ /* Check if an option is in --ignore-unknown-option and
+ * set warning level to non fatal */
+ for (i = 0; options->ignore_unknown_option &&
options->ignore_unknown_option[i]; i++)
+ {
+ if (streq(p[0], options->ignore_unknown_option[i]))
+ {
+ msglevel_unknown = M_WARN;
+ break;
+ }
+ }
+ msg(msglevel_unknown, "Unrecognized option or missing or extra
parameter(s) in %s:%d: -%s (%s)", file, line, p[0], PACKAGE_VERSION);
+ }
+ return;
+err:
+ msg(msglevel, "Error occurred trying to remove %s option", p[0]);
+}
bool
apply_push_options(struct context *c,
struct options *options,
@@ -5585,11 +5788,47 @@
add_option(options, p, false, file, line_num, 0, msglevel,
permission_mask, option_types_found, es);
}
+ else if (push_update_option_flags & PUSH_OPT_TO_REMOVE)
+ {
+ remove_option(c, options, p, false, file, line_num, msglevel,
+ permission_mask, option_types_found, es);
+ }
}
}
return true;
}
+void
+options_server_import(struct options *o,
+ const char *filename,
+ int msglevel,
+ unsigned int permission_mask,
+ unsigned int *option_types_found,
+ struct env_set *es)
+{
+ msg(D_PUSH, "OPTIONS IMPORT: reading client specific options from: %s",
filename);
+ read_config_file(o,
+ filename,
+ 0,
+ filename,
+ 0,
+ msglevel,
+ permission_mask,
+ option_types_found,
+ es);
+}
+
+void
+options_string_import(struct options *options,
+ const char *config,
+ const int msglevel,
+ const unsigned int permission_mask,
+ unsigned int *option_types_found,
+ struct env_set *es)
+{
+ read_config_string("[CONFIG-STRING]", options, config, msglevel,
permission_mask, option_types_found, es);
+}
+
static void
set_user_script(struct options *options,
const char **script,
diff --git a/src/openvpn/push.c b/src/openvpn/push.c
index db1393e..29c7f79 100644
--- a/src/openvpn/push.c
+++ b/src/openvpn/push.c
@@ -542,6 +542,11 @@
{
msg(M_WARN, "No updatable options found in incoming
PUSH_UPDATE message");
}
+ else if (!do_update(c, option_types_found))
+ {
+ msg(D_PUSH_ERRORS, "Failed to update options");
+ goto error;
+ }
}
}
event_timeout_clear(&c->c2.push_request_interval);
diff --git a/src/openvpn/route.c b/src/openvpn/route.c
index d17b285..35cf5e9 100644
--- a/src/openvpn/route.c
+++ b/src/openvpn/route.c
@@ -1258,7 +1258,16 @@
const struct tuntap *tt, unsigned int flags,
const struct env_set *es, openvpn_net_ctx_t *ctx)
{
- if (rl && rl->iflags & RL_ROUTES_ADDED)
+ delete_routes_v4(rl, tt, flags, es, ctx);
+ delete_routes_v6(rl6, tt, flags, es, ctx);
+}
+
+void
+delete_routes_v4(struct route_list *rl, const struct tuntap *tt,
+ unsigned int flags, const struct env_set *es,
+ openvpn_net_ctx_t *ctx)
+{
+ if (rl && (rl->iflags & RL_ROUTES_ADDED))
{
struct route_ipv4 *r;
for (r = rl->routes; r; r = r->next)
@@ -1274,8 +1283,14 @@
{
clear_route_list(rl);
}
+}
- if (rl6 && (rl6->iflags & RL_ROUTES_ADDED) )
+void
+delete_routes_v6(struct route_ipv6_list *rl6, const struct tuntap *tt,
+ unsigned int flags, const struct env_set *es,
+ openvpn_net_ctx_t *ctx)
+{
+ if (rl6 && (rl6->iflags & RL_ROUTES_ADDED))
{
struct route_ipv6 *r6;
for (r6 = rl6->routes_ipv6; r6; r6 = r6->next)
diff --git a/src/openvpn/route.h b/src/openvpn/route.h
index 421e7d2..0cc9ed6 100644
--- a/src/openvpn/route.h
+++ b/src/openvpn/route.h
@@ -321,6 +321,16 @@
const struct env_set *es,
openvpn_net_ctx_t *ctx);
+void
+delete_routes_v4(struct route_list *rl, const struct tuntap *tt,
+ unsigned int flags, const struct env_set *es,
+ openvpn_net_ctx_t *ctx);
+
+void
+delete_routes_v6(struct route_ipv6_list *rl6, const struct tuntap *tt,
+ unsigned int flags, const struct env_set *es,
+ openvpn_net_ctx_t *ctx);
+
void setenv_routes(struct env_set *es, const struct route_list *rl);
void setenv_routes_ipv6(struct env_set *es, const struct route_ipv6_list *rl6);
--
To view, visit http://gerrit.openvpn.net/c/openvpn/+/809?usp=email
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Gerrit-Project: openvpn
Gerrit-Branch: master
Gerrit-Change-Id: I507180d7397b6959844a30908010132bc3411067
Gerrit-Change-Number: 809
Gerrit-PatchSet: 12
Gerrit-Owner: mrbff <ma...@mandelbit.com>
Gerrit-Reviewer: flichtenheld <fr...@lichtenheld.com>
Gerrit-Reviewer: plaisthos <arne-open...@rfc2549.org>
Gerrit-Reviewer: stipa <lstipa...@gmail.com>
Gerrit-CC: openvpn-devel <openvpn-devel@lists.sourceforge.net>
Gerrit-Attention: plaisthos <arne-open...@rfc2549.org>
Gerrit-Attention: flichtenheld <fr...@lichtenheld.com>
Gerrit-Attention: mrbff <ma...@mandelbit.com>
Gerrit-MessageType: newpatchset
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