static void helper_stdout_readable(libxl__egc *egc, libxl__ev_fd *ev,
int fd, short events, short revents)
{
libxl__save_helper_state *shs = CONTAINER_OF(ev, *shs, readable);
STATE_AO_GC(shs->ao);
int rc, errnoval;
if (revents & (POLLERR|POLLPRI)) {
LOG(ERROR, "%s signaled POLLERR|POLLPRI (%#x)",
shs->stdout_what, revents);
rc = ERROR_FAIL;
out:
/* this is here because otherwise we bypass the decl of msg[] */
helper_failed(egc, shs, rc);
return;
}
uint16_t msglen;
errnoval = libxl_read_exactly(CTX, fd, &msglen, sizeof(msglen),
shs->stdout_what, "ipc msg header");
if (errnoval) { rc = ERROR_FAIL; goto out; }
unsigned char msg[msglen];
errnoval = libxl_read_exactly(CTX, fd, msg, msglen,
shs->stdout_what, "ipc msg body");
if (errnoval) { rc = ERROR_FAIL; goto out; }
shs->egc = egc;
shs->recv_callback(msg, msglen, shs);
shs->egc = 0;
return;
}
void libxl__srm_callout_sendreply(int r, void *user)
{
libxl__save_helper_state *shs = user;
libxl__egc *egc = shs->egc;
STATE_AO_GC(shs->ao);
int errnoval;
errnoval = libxl_write_exactly(CTX, libxl__carefd_fd(shs->pipes[0]),
&r, sizeof(r), shs->stdin_what,
"callback return value");
if (errnoval)
helper_failed(egc, shs, ERROR_FAIL);
}
static void helper_stop(libxl__egc *egc, libxl__ao_abortable *abrt, int rc)
{
libxl__save_helper_state *shs = CONTAINER_OF(abrt, *shs, abrt);
STATE_AO_GC(shs->ao);
if (!libxl__save_helper_inuse(shs)) {
helper_failed(egc, shs, rc);
return;
}
if (!shs->rc)
shs->rc = rc;
libxl__kill(gc, shs->child.pid, SIGTERM, "save/restore helper");
}
static void run_helper(libxl__egc *egc, libxl__save_helper_state *shs,
const char *mode_arg, int stream_fd,
const int *preserve_fds, int num_preserve_fds,
const unsigned long *argnums, int num_argnums)
{
STATE_AO_GC(shs->ao);
const char *args[4 + num_argnums];
const char **arg = args;
int i, rc;
/* Resources we must free */
libxl__carefd *childs_pipes[2] = { 0,0 };
/* Convenience aliases */
const uint32_t domid = shs->domid;
shs->rc = 0;
shs->completed = 0;
shs->pipes[0] = shs->pipes[1] = 0;
libxl__ev_fd_init(&shs->readable);
libxl__ev_child_init(&shs->child);
shs->stdin_what = GCSPRINTF("domain %"PRIu32" save/restore helper"
" stdin pipe", domid);
shs->stdout_what = GCSPRINTF("domain %"PRIu32" save/restore helper"
" stdout pipe", domid);
*arg++ = getenv("LIBXL_SAVE_HELPER") ?: PRIVATE_BINDIR "/" "libxl-save-helper";
*arg++ = mode_arg;
const char **stream_fd_arg = arg++;
for (i=0; i<num_argnums; i++)
*arg++ = GCSPRINTF("%lu", argnums[i]);
*arg++ = 0;
assert(arg == args + ARRAY_SIZE(args));
libxl__carefd_begin();
int childfd;
for (childfd=0; childfd<2; childfd++) {
/* Setting up the pipe for the child's fd childfd */
int fds[2];
if (libxl_pipe(CTX,fds)) {
rc = ERROR_FAIL;
libxl__carefd_unlock();
goto out;
}
int childs_end = childfd==0 ? 0 /*read*/ : 1 /*write*/;
int our_end = childfd==0 ? 1 /*write*/ : 0 /*read*/;
childs_pipes[childfd] = libxl__carefd_record(CTX, fds[childs_end]);
shs->pipes[childfd] = libxl__carefd_record(CTX, fds[our_end]);
}
libxl__carefd_unlock();
pid_t pid = libxl__ev_child_fork(gc, &shs->child, helper_exited);
if (!pid) {
if (stream_fd <= 2) {
stream_fd = dup(stream_fd);
if (stream_fd < 0) {
LOGE(ERROR,"dup migration stream fd");
exit(-1);
}
}
libxl_fd_set_cloexec(CTX, stream_fd, 0);
*stream_fd_arg = GCSPRINTF("%d", stream_fd);
for (i=0; i<num_preserve_fds; i++)
if (preserve_fds[i] >= 0) {
assert(preserve_fds[i] > 2);
libxl_fd_set_cloexec(CTX, preserve_fds[i], 0);
}
libxl__exec(gc,
libxl__carefd_fd(childs_pipes[0]),
libxl__carefd_fd(childs_pipes[1]),
-1,
args[0], (char**)args, 0);
}
libxl__carefd_close(childs_pipes[0]);
libxl__carefd_close(childs_pipes[1]);
rc = libxl__ev_fd_register(gc, &shs->readable, helper_stdout_readable,
libxl__carefd_fd(shs->pipes[1]), POLLIN|POLLPRI);
if (rc) goto out;
return;
out:
libxl__carefd_close(childs_pipes[0]);
libxl__carefd_close(childs_pipes[1]);
helper_failed(egc, shs, rc);;
}
static gboolean
nm_openssh_send_ip4_config (sshtun_handle_t handle)
{
DBusGConnection *connection;
GError *err = NULL;
GHashTable *config;
GValue *val;
struct in_addr temp_addr;
const char *tmp;
connection = dbus_g_bus_get (DBUS_BUS_SYSTEM, &err);
if (!connection)
return FALSE;
config = g_hash_table_new (g_str_hash, g_str_equal);
/* Gateway */
val = addr_to_gvalue (sshtun_get_param (handle, SSHTUN_PARAM_GW_ADDR));
if (val)
g_hash_table_insert (config, NM_VPN_PLUGIN_IP4_CONFIG_GATEWAY, val);
else {
helper_failed (connection, "VPN Gateway");
dbus_g_connection_unref (connection);
return FALSE;
}
/* Tunnel device */
val = str_to_gvalue (sshtun_get_param (handle, SSHTUN_PARAM_TUN_DEV),
FALSE);
if (val)
g_hash_table_insert (config, NM_VPN_PLUGIN_IP4_CONFIG_TUNDEV, val);
else {
helper_failed (connection, "Tunnel Device");
dbus_g_connection_unref (connection);
return FALSE;
}
/* IP address */
val = addr_to_gvalue (sshtun_get_param (handle, SSHTUN_PARAM_ADDR));
if (val)
g_hash_table_insert (config, NM_VPN_PLUGIN_IP4_CONFIG_ADDRESS, val);
else {
helper_failed (connection, "IP4 Address");
dbus_g_connection_unref (connection);
return FALSE;
}
/* PTP address */
val = addr_to_gvalue (sshtun_get_param (handle, SSHTUN_PARAM_PEER_ADDR));
if (val)
g_hash_table_insert (config, NM_VPN_PLUGIN_IP4_CONFIG_PTP, val);
/* Netmask */
tmp = sshtun_get_param (handle, SSHTUN_PARAM_NETMASK);
if (tmp && inet_pton (AF_INET, tmp, &temp_addr) > 0) {
val = uint_to_gvalue (nm_utils_ip4_netmask_to_prefix (temp_addr.s_addr));
g_hash_table_insert (config, NM_VPN_PLUGIN_IP4_CONFIG_PREFIX, val);
}
/* MTU */
tmp = sshtun_get_param (handle, SSHTUN_PARAM_MTU);
if (tmp && strlen (tmp)) {
long int mtu;
errno = 0;
mtu = strtol (tmp, NULL, 10);
if (errno || mtu < 0 || mtu > 20000) {
nm_warning ("Ignoring invalid tunnel MTU '%s'", tmp);
} else {
val = uint_to_gvalue ((guint32) mtu);
g_hash_table_insert (config, NM_VPN_PLUGIN_IP4_CONFIG_MTU, val);
}
}
send_ip4_config (connection, config);
dbus_g_connection_unref (connection);
return TRUE;
}
int
main (int argc, char *argv[])
{
GDBusProxy *proxy;
GVariantBuilder builder, ip4builder, ip6builder;
GVariant *ip4config, *ip6config;
char *tmp;
GVariant *val;
int i;
GError *err = NULL;
GPtrArray *dns4_list, *dns6_list;
GPtrArray *nbns_list;
GPtrArray *dns_domains;
struct in_addr temp_addr;
int tapdev = -1;
char **iter;
int shift = 0;
gboolean is_restart;
gboolean has_ip4_prefix = FALSE;
gboolean has_ip4_address = FALSE;
gboolean has_ip6_address = FALSE;
gchar *bus_name = NM_DBUS_SERVICE_OPENVPN;
#if !GLIB_CHECK_VERSION (2, 35, 0)
g_type_init ();
#endif
for (i = 1; i < argc; i++) {
if (!strcmp (argv[i], "--")) {
i++;
break;
}
if (nm_streq (argv[i], "--debug")) {
if (i + 2 >= argc) {
g_printerr ("Missing debug arguments (requires <LEVEL> <PREFIX_TOKEN>)\n");
exit (1);
}
gl.log_level = _nm_utils_ascii_str_to_int64 (argv[++i], 10, 0, LOG_DEBUG, 0);
gl.log_prefix_token = argv[++i];
} else if (!strcmp (argv[i], "--tun"))
tapdev = 0;
else if (!strcmp (argv[i], "--tap"))
tapdev = 1;
else if (!strcmp (argv[i], "--bus-name")) {
if (++i == argc) {
g_printerr ("Missing bus name argument\n");
exit (1);
}
if (!g_dbus_is_name (argv[i])) {
g_printerr ("Invalid bus name\n");
exit (1);
}
bus_name = argv[i];
} else
break;
}
shift = i - 1;
if (_LOGD_enabled ()) {
GString *args;
args = g_string_new (NULL);
for (i = 0; i < argc; i++) {
if (i > 0)
g_string_append_c (args, ' ');
if (shift && 1 + shift == i)
g_string_append (args, " ");
tmp = g_strescape (argv[i], NULL);
g_string_append_printf (args, "\"%s\"", tmp);
g_free (tmp);
}
_LOGD ("command line: %s", args->str);
g_string_free (args, TRUE);
for (iter = environ; iter && *iter; iter++)
_LOGD ("environment: %s", *iter);
}
/* shift the arguments to the right leaving only those provided by openvpn */
argv[shift] = argv[0];
argv += shift;
argc -= shift;
is_restart = argc >= 7 && !g_strcmp0 (argv[6], "restart");
proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES,
NULL,
bus_name,
NM_VPN_DBUS_PLUGIN_PATH,
NM_VPN_DBUS_PLUGIN_INTERFACE,
NULL, &err);
if (!proxy) {
_LOGW ("Could not create a D-Bus proxy: %s", err->message);
g_error_free (err);
exit (1);
}
g_variant_builder_init (&builder, G_VARIANT_TYPE_VARDICT);
g_variant_builder_init (&ip4builder, G_VARIANT_TYPE_VARDICT);
g_variant_builder_init (&ip6builder, G_VARIANT_TYPE_VARDICT);
/* External world-visible VPN gateway */
val = trusted_remote_to_gvariant ();
if (val)
g_variant_builder_add (&builder, "{sv}", NM_VPN_PLUGIN_CONFIG_EXT_GATEWAY, val);
else
helper_failed (proxy, "VPN Gateway");
/* Internal VPN subnet gateway */
tmp = getenv ("route_vpn_gateway");
val = addr4_to_gvariant (tmp);
if (val)
g_variant_builder_add (&ip4builder, "{sv}", NM_VPN_PLUGIN_IP4_CONFIG_INT_GATEWAY, val);
else {
val = addr6_to_gvariant (tmp);
if (val)
g_variant_builder_add (&ip6builder, "{sv}", NM_VPN_PLUGIN_IP6_CONFIG_INT_GATEWAY, val);
}
/* VPN device */
tmp = getenv ("dev");
val = str_to_gvariant (tmp, FALSE);
if (val)
g_variant_builder_add (&builder, "{sv}", NM_VPN_PLUGIN_CONFIG_TUNDEV, val);
else
helper_failed (proxy, "Tunnel Device");
if (tapdev == -1)
tapdev = strncmp (tmp, "tap", 3) == 0;
/* IPv4 address */
tmp = getenv ("ifconfig_local");
if (!tmp && is_restart)
tmp = argv[4];
if (tmp && strlen (tmp)) {
val = addr4_to_gvariant (tmp);
if (val) {
has_ip4_address = TRUE;
g_variant_builder_add (&ip4builder, "{sv}", NM_VPN_PLUGIN_IP4_CONFIG_ADDRESS, val);
} else
helper_failed (proxy, "IP4 Address");
}
/* PTP address; for vpnc PTP address == internal IP4 address */
tmp = getenv ("ifconfig_remote");
if (!tmp && is_restart)
tmp = argv[5];
val = addr4_to_gvariant (tmp);
if (val) {
/* Sigh. Openvpn added 'topology' stuff in 2.1 that changes the meaning
* of the ifconfig bits without actually telling you what they are
* supposed to mean; basically relying on specific 'ifconfig' behavior.
*/
if (tmp && !strncmp (tmp, "255.", 4)) {
guint32 addr;
/* probably a netmask, not a PTP address; topology == subnet */
addr = g_variant_get_uint32 (val);
g_variant_unref (val);
val = g_variant_new_uint32 (nm_utils_ip4_netmask_to_prefix (addr));
g_variant_builder_add (&ip4builder, "{sv}", NM_VPN_PLUGIN_IP4_CONFIG_PREFIX, val);
has_ip4_prefix = TRUE;
} else
g_variant_builder_add (&ip4builder, "{sv}", NM_VPN_PLUGIN_IP4_CONFIG_PTP, val);
}
/* Netmask
*
* Either TAP or TUN modes can have an arbitrary netmask in newer versions
* of openvpn, while in older versions only TAP mode would. So accept a
* netmask if passed, otherwise default to /32 for TUN devices since they
* are usually point-to-point.
*/
tmp = getenv ("ifconfig_netmask");
if (tmp && inet_pton (AF_INET, tmp, &temp_addr) > 0) {
val = g_variant_new_uint32 (nm_utils_ip4_netmask_to_prefix (temp_addr.s_addr));
g_variant_builder_add (&ip4builder, "{sv}", NM_VPN_PLUGIN_IP4_CONFIG_PREFIX, val);
} else if (!tapdev) {
if (has_ip4_address && !has_ip4_prefix) {
val = g_variant_new_uint32 (32);
g_variant_builder_add (&ip4builder, "{sv}", NM_VPN_PLUGIN_IP4_CONFIG_PREFIX, val);
}
} else
_LOGW ("No IP4 netmask/prefix (missing or invalid 'ifconfig_netmask')");
val = get_ip4_routes ();
if (val)
g_variant_builder_add (&ip4builder, "{sv}", NM_VPN_PLUGIN_IP4_CONFIG_ROUTES, val);
else if (is_restart) {
g_variant_builder_add (&ip4builder, "{sv}",
NM_VPN_PLUGIN_IP4_CONFIG_PRESERVE_ROUTES,
g_variant_new_boolean (TRUE));
}
/* IPv6 address */
tmp = getenv ("ifconfig_ipv6_local");
if (tmp && strlen (tmp)) {
val = addr6_to_gvariant (tmp);
if (val) {
g_variant_builder_add (&ip6builder, "{sv}", NM_VPN_PLUGIN_IP6_CONFIG_ADDRESS, val);
has_ip6_address = TRUE;
} else
helper_failed (proxy, "IP6 Address");
}
/* IPv6 remote address */
tmp = getenv ("ifconfig_ipv6_remote");
if (tmp && strlen (tmp)) {
val = addr6_to_gvariant (tmp);
if (val)
g_variant_builder_add (&ip6builder, "{sv}", NM_VPN_PLUGIN_IP6_CONFIG_PTP, val);
else
helper_failed (proxy, "IP6 PTP Address");
}
/* IPv6 netbits */
tmp = getenv ("ifconfig_ipv6_netbits");
if (tmp && strlen (tmp)) {
long int netbits;
errno = 0;
netbits = strtol (tmp, NULL, 10);
if (errno || netbits < 0 || netbits > 128) {
_LOGW ("Ignoring invalid prefix '%s'", tmp);
} else {
val = g_variant_new_uint32 ((guint32) netbits);
g_variant_builder_add (&ip6builder, "{sv}", NM_VPN_PLUGIN_IP6_CONFIG_PREFIX, val);
}
}
val = get_ip6_routes ();
if (val)
g_variant_builder_add (&ip6builder, "{sv}", NM_VPN_PLUGIN_IP6_CONFIG_ROUTES, val);
else if (is_restart) {
g_variant_builder_add (&ip6builder, "{sv}",
NM_VPN_PLUGIN_IP6_CONFIG_PRESERVE_ROUTES,
g_variant_new_boolean (TRUE));
}
/* DNS and WINS servers */
dns_domains = g_ptr_array_sized_new (3);
dns4_list = g_ptr_array_new ();
dns6_list = g_ptr_array_new ();
nbns_list = g_ptr_array_new ();
for (i = 1; i < 256; i++) {
char *env_name;
env_name = g_strdup_printf ("foreign_option_%d", i);
tmp = getenv (env_name);
g_free (env_name);
if (!tmp || strlen (tmp) < 1)
break;
if (!g_str_has_prefix (tmp, "dhcp-option "))
continue;
tmp += 12; /* strlen ("dhcp-option ") */
if (g_str_has_prefix (tmp, "DNS "))
parse_addr_list (dns4_list, dns6_list, tmp + 4);
else if (g_str_has_prefix (tmp, "WINS "))
parse_addr_list (nbns_list, NULL, tmp + 5);
else if (g_str_has_prefix (tmp, "DOMAIN ") && is_domain_valid (tmp + 7))
g_ptr_array_add (dns_domains, tmp + 7);
}
if (dns4_list->len) {
val = g_variant_new_array (G_VARIANT_TYPE_UINT32, (GVariant **) dns4_list->pdata, dns4_list->len);
g_variant_builder_add (&ip4builder, "{sv}", NM_VPN_PLUGIN_IP4_CONFIG_DNS, val);
}
if (has_ip6_address && dns6_list->len) {
val = g_variant_new_array (G_VARIANT_TYPE ("ay"), (GVariant **) dns6_list->pdata, dns6_list->len);
g_variant_builder_add (&ip6builder, "{sv}", NM_VPN_PLUGIN_IP6_CONFIG_DNS, val);
}
if (nbns_list->len) {
val = g_variant_new_array (G_VARIANT_TYPE_UINT32, (GVariant **) nbns_list->pdata, nbns_list->len);
g_variant_builder_add (&ip4builder, "{sv}", NM_VPN_PLUGIN_IP4_CONFIG_NBNS, val);
}
if (dns_domains->len) {
val = g_variant_new_strv ((const gchar **) dns_domains->pdata, dns_domains->len);
g_variant_builder_add (&ip4builder, "{sv}", NM_VPN_PLUGIN_IP4_CONFIG_DOMAINS, val);
/* Domains apply to both IPv4 and IPv6 configurations */
if (has_ip6_address) {
val = g_variant_new_strv ((const gchar **) dns_domains->pdata, dns_domains->len);
g_variant_builder_add (&ip6builder, "{sv}", NM_VPN_PLUGIN_IP6_CONFIG_DOMAINS, val);
}
}
g_ptr_array_unref (dns4_list);
g_ptr_array_unref (dns6_list);
g_ptr_array_unref (nbns_list);
g_ptr_array_unref (dns_domains);
/* Tunnel MTU */
tmp = getenv ("tun_mtu");
if (tmp && strlen (tmp)) {
long int mtu;
errno = 0;
mtu = strtol (tmp, NULL, 10);
if (errno || mtu < 0 || mtu > 20000) {
_LOGW ("Ignoring invalid tunnel MTU '%s'", tmp);
} else {
val = g_variant_new_uint32 ((guint32) mtu);
g_variant_builder_add (&builder, "{sv}", NM_VPN_PLUGIN_CONFIG_MTU, val);
}
}
ip4config = g_variant_builder_end (&ip4builder);
if (g_variant_n_children (ip4config)) {
val = g_variant_new_boolean (TRUE);
g_variant_builder_add (&builder, "{sv}", NM_VPN_PLUGIN_CONFIG_HAS_IP4, val);
} else {
g_variant_unref (ip4config);
ip4config = NULL;
}
ip6config = g_variant_builder_end (&ip6builder);
if (g_variant_n_children (ip6config)) {
val = g_variant_new_boolean (TRUE);
g_variant_builder_add (&builder, "{sv}", NM_VPN_PLUGIN_CONFIG_HAS_IP6, val);
} else {
g_variant_unref (ip6config);
ip6config = NULL;
}
if (!ip4config && !ip6config)
helper_failed (proxy, "IPv4 or IPv6 configuration");
/* Send the config info to nm-openvpn-service */
send_config (proxy, g_variant_builder_end (&builder), ip4config, ip6config);
g_object_unref (proxy);
return 0;
}