gio/gsimpleproxyresolver.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright 2010, 2013 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, see
  17  * <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "gsimpleproxyresolver.h"
  26 #include "ginetaddress.h"
  27 #include "ginetaddressmask.h"
  28 #include "gnetworkingprivate.h"
  29 #include "gtask.h"
  30
  31 #include "glibintl.h"
  32
  33 /**
  34  * SECTION:gsimpleproxyresolver
  35  * @short_description: Simple proxy resolver implementation
  36  * @include: gio/gio.h
  37  * @see_also: g_socket_client_set_proxy_resolver()
  38  *
  39  * #GSimpleProxyResolver is a simple #GProxyResolver implementation
  40  * that handles a single default proxy, multiple URI-scheme-specific
  41  * proxies, and a list of hosts that proxies should not be used for.
  42  *
  43  * #GSimpleProxyResolver is never the default proxy resolver, but it
  44  * can be used as the base class for another proxy resolver
  45  * implementation, or it can be created and used manually, such as
  46  * with g_socket_client_set_proxy_resolver().
  47  *
  48  * Since: 2.36
  49  */
  50
  51 typedef struct {
  52   gchar        *name;
  53   gint          length;
  54   gushort       port;
  55 } GSimpleProxyResolverDomain;
  56
  57 struct _GSimpleProxyResolverPrivate {
  58   gchar *default_proxy, **ignore_hosts;
  59   GHashTable *uri_proxies;
  60
  61   GPtrArray *ignore_ips;
  62   GSimpleProxyResolverDomain *ignore_domains;
  63 };
  64
  65 static void g_simple_proxy_resolver_iface_init (GProxyResolverInterface *iface);
  66
  67 G_DEFINE_TYPE_WITH_CODE (GSimpleProxyResolver, g_simple_proxy_resolver, G_TYPE_OBJECT,
  68                          G_ADD_PRIVATE (GSimpleProxyResolver)
  69                          G_IMPLEMENT_INTERFACE (G_TYPE_PROXY_RESOLVER,
  70                                                 g_simple_proxy_resolver_iface_init))
  71
  72 enum
  73 {
  74   PROP_0,
  75   PROP_DEFAULT_PROXY,
  76   PROP_IGNORE_HOSTS
  77 };
  78
  79 static void reparse_ignore_hosts (GSimpleProxyResolver *resolver);
  80
  81 static void
  82 g_simple_proxy_resolver_finalize (GObject *object)
  83 {
  84   GSimpleProxyResolver *resolver = G_SIMPLE_PROXY_RESOLVER (object);
  85   GSimpleProxyResolverPrivate *priv = resolver->priv;
  86
  87   g_free (priv->default_proxy);
  88   g_hash_table_destroy (priv->uri_proxies);
  89
  90   g_clear_pointer (&priv->ignore_hosts, g_strfreev);
  91   /* This will free ignore_ips and ignore_domains */
  92   reparse_ignore_hosts (resolver);
  93
  94   G_OBJECT_CLASS (g_simple_proxy_resolver_parent_class)->finalize (object);
  95 }
  96
  97 static void
  98 g_simple_proxy_resolver_init (GSimpleProxyResolver *resolver)
  99 {
 100   resolver->priv = g_simple_proxy_resolver_get_instance_private (resolver);
 101   resolver->priv->uri_proxies = g_hash_table_new_full (g_str_hash, g_str_equal,
 102                                                        g_free, g_free);
 103 }
 104
 105 static void
 106 g_simple_proxy_resolver_set_property (GObject      *object,
 107                                       guint         prop_id,
 108                                       const GValue *value,
 109                                       GParamSpec   *pspec)
 110 {
 111   GSimpleProxyResolver *resolver = G_SIMPLE_PROXY_RESOLVER (object);
 112
 113   switch (prop_id)
 114     {
 115       case PROP_DEFAULT_PROXY:
 116         g_simple_proxy_resolver_set_default_proxy (resolver, g_value_get_string (value));
 117         break;
 118
 119       case PROP_IGNORE_HOSTS:
 120         g_simple_proxy_resolver_set_ignore_hosts (resolver, g_value_get_boxed (value));
 121         break;
 122
 123       default:
 124         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 125     }
 126 }
 127
 128 static void
 129 g_simple_proxy_resolver_get_property (GObject    *object,
 130                                       guint       prop_id,
 131                                       GValue     *value,
 132                                       GParamSpec *pspec)
 133 {
 134   GSimpleProxyResolver *resolver = G_SIMPLE_PROXY_RESOLVER (object);
 135
 136   switch (prop_id)
 137     {
 138       case PROP_DEFAULT_PROXY:
 139         g_value_set_string (value, resolver->priv->default_proxy);
 140         break;
 141
 142       case PROP_IGNORE_HOSTS:
 143         g_value_set_boxed (value, resolver->priv->ignore_hosts);
 144         break;
 145
 146       default:
 147         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 148     }
 149 }
 150
 151 static void
 152 reparse_ignore_hosts (GSimpleProxyResolver *resolver)
 153 {
 154   GSimpleProxyResolverPrivate *priv = resolver->priv;
 155   GPtrArray *ignore_ips;
 156   GArray *ignore_domains;
 157   gchar *host, *tmp, *colon, *bracket;
 158   GInetAddress *iaddr;
 159   GInetAddressMask *mask;
 160   GSimpleProxyResolverDomain domain;
 161   gushort port;
 162   int i;
 163
 164   if (priv->ignore_ips)
 165     g_ptr_array_free (priv->ignore_ips, TRUE);
 166   if (priv->ignore_domains)
 167     {
 168       for (i = 0; priv->ignore_domains[i].name; i++)
 169         g_free (priv->ignore_domains[i].name);
 170       g_free (priv->ignore_domains);
 171     }
 172   priv->ignore_ips = NULL;
 173   priv->ignore_domains = NULL;
 174
 175   if (!priv->ignore_hosts || !priv->ignore_hosts[0])
 176     return;
 177
 178   ignore_ips = g_ptr_array_new_with_free_func (g_object_unref);
 179   ignore_domains = g_array_new (TRUE, FALSE, sizeof (GSimpleProxyResolverDomain));
 180
 181   for (i = 0; priv->ignore_hosts[i]; i++)
 182     {
 183       host = g_strchomp (priv->ignore_hosts[i]);
 184
 185       /* See if it's an IP address or IP/length mask */
 186       mask = g_inet_address_mask_new_from_string (host, NULL);
 187       if (mask)
 188         {
 189           g_ptr_array_add (ignore_ips, mask);
 190           continue;
 191         }
 192
 193       port = 0;
 194
 195       if (*host == '[')
 196         {
 197           /* [IPv6]:port */
 198           host++;
 199           bracket = strchr (host, ']');
 200           if (!bracket || !bracket[1] || bracket[1] != ':')
 201             goto bad;
 202
 203           port = strtoul (bracket + 2, &tmp, 10);
 204           if (*tmp)
 205             goto bad;
 206
 207           *bracket = '\0';
 208         }
 209       else
 210         {
 211           colon = strchr (host, ':');
 212           if (colon && !strchr (colon + 1, ':'))
 213             {
 214               /* hostname:port or IPv4:port */
 215               port = strtoul (colon + 1, &tmp, 10);
 216               if (*tmp)
 217                 goto bad;
 218               *colon = '\0';
 219             }
 220         }
 221
 222       iaddr = g_inet_address_new_from_string (host);
 223       if (iaddr)
 224         g_object_unref (iaddr);
 225       else
 226         {
 227           if (g_str_has_prefix (host, "*."))
 228             host += 2;
 229           else if (*host == '.')
 230             host++;
 231         }
 232
 233       memset (&domain, 0, sizeof (domain));
 234       domain.name = g_strdup (host);
 235       domain.length = strlen (domain.name);
 236       domain.port = port;
 237       g_array_append_val (ignore_domains, domain);
 238       continue;
 239
 240     bad:
 241       g_warning ("Ignoring invalid ignore_hosts value '%s'", host);
 242     }
 243
 244   if (ignore_ips->len)
 245     priv->ignore_ips = ignore_ips;
 246   else
 247     g_ptr_array_free (ignore_ips, TRUE);
 248
 249   if (ignore_domains->len)
 250     priv->ignore_domains = (GSimpleProxyResolverDomain *)ignore_domains->data;
 251   g_array_free (ignore_domains, ignore_domains->len == 0);
 252 }
 253
 254 static gboolean
 255 ignore_host (GSimpleProxyResolver *resolver,
 256              const gchar          *host,
 257              gushort               port)
 258 {
 259   GSimpleProxyResolverPrivate *priv = resolver->priv;
 260   gchar *ascii_host = NULL;
 261   gboolean ignore = FALSE;
 262   gint i, length, offset;
 263
 264   if (priv->ignore_ips)
 265     {
 266       GInetAddress *iaddr;
 267
 268       iaddr = g_inet_address_new_from_string (host);
 269       if (iaddr)
 270         {
 271           for (i = 0; i < priv->ignore_ips->len; i++)
 272             {
 273               GInetAddressMask *mask = priv->ignore_ips->pdata[i];
 274
 275               if (g_inet_address_mask_matches (mask, iaddr))
 276                 {
 277                   ignore = TRUE;
 278                   break;
 279                 }
 280             }
 281
 282           g_object_unref (iaddr);
 283           if (ignore)
 284             return TRUE;
 285         }
 286     }
 287
 288   if (priv->ignore_domains)
 289     {
 290       if (g_hostname_is_non_ascii (host))
 291         host = ascii_host = g_hostname_to_ascii (host);
 292       length = strlen (host);
 293
 294       for (i = 0; priv->ignore_domains[i].length; i++)
 295         {
 296           GSimpleProxyResolverDomain *domain = &priv->ignore_domains[i];
 297
 298           offset = length - domain->length;
 299           if ((domain->port == 0 || domain->port == port) &&
 300               (offset == 0 || (offset > 0 && host[offset - 1] == '.')) &&
 301               (g_ascii_strcasecmp (domain->name, host + offset) == 0))
 302             {
 303               ignore = TRUE;
 304               break;
 305             }
 306         }
 307
 308       g_free (ascii_host);
 309     }
 310
 311   return ignore;
 312 }
 313
 314 static gchar **
 315 g_simple_proxy_resolver_lookup (GProxyResolver  *proxy_resolver,
 316                                 const gchar     *uri,
 317                                 GCancellable    *cancellable,
 318                                 GError         **error)
 319 {
 320   GSimpleProxyResolver *resolver = G_SIMPLE_PROXY_RESOLVER (proxy_resolver);
 321   GSimpleProxyResolverPrivate *priv = resolver->priv;
 322   const gchar *proxy = NULL;
 323   gchar **proxies;
 324
 325   if (priv->ignore_ips || priv->ignore_domains)
 326     {
 327       gchar *host = NULL;
 328       gushort port;
 329
 330       if (_g_uri_parse_authority (uri, &host, &port, NULL) &&
 331           ignore_host (resolver, host, port))
 332         proxy = "direct://";
 333
 334       g_free (host);
 335     }
 336
 337   if (!proxy && g_hash_table_size (priv->uri_proxies))
 338     {
 339       gchar *scheme = g_ascii_strdown (uri, strcspn (uri, ":"));
 340
 341       proxy = g_hash_table_lookup (priv->uri_proxies, scheme);
 342       g_free (scheme);
 343     }
 344
 345   if (!proxy)
 346     proxy = priv->default_proxy;
 347   if (!proxy)
 348     proxy = "direct://";
 349
 350   if (!strncmp (proxy, "socks://", 8))
 351     {
 352       proxies = g_new0 (gchar *, 4);
 353       proxies[0] = g_strdup_printf ("socks5://%s", proxy + 8);
 354       proxies[1] = g_strdup_printf ("socks4a://%s", proxy + 8);
 355       proxies[2] = g_strdup_printf ("socks4://%s", proxy + 8);
 356       proxies[3] = NULL;
 357     }
 358   else
 359     {
 360       proxies = g_new0 (gchar *, 2);
 361       proxies[0] = g_strdup (proxy);
 362     }
 363
 364   return proxies;
 365 }
 366
 367 static void
 368 g_simple_proxy_resolver_lookup_async (GProxyResolver      *proxy_resolver,
 369                                       const gchar         *uri,
 370                                       GCancellable        *cancellable,
 371                                       GAsyncReadyCallback  callback,
 372                                       gpointer             user_data)
 373 {
 374   GSimpleProxyResolver *resolver = G_SIMPLE_PROXY_RESOLVER (proxy_resolver);
 375   GTask *task;
 376   GError *error = NULL;
 377   char **proxies;
 378
 379   task = g_task_new (resolver, cancellable, callback, user_data);
 380   g_task_set_source_tag (task, g_simple_proxy_resolver_lookup_async);
 381
 382   proxies = g_simple_proxy_resolver_lookup (proxy_resolver, uri,
 383                                             cancellable, &error);
 384   if (proxies)
 385     g_task_return_pointer (task, proxies, (GDestroyNotify)g_strfreev);
 386   else
 387     g_task_return_error (task, error);
 388   g_object_unref (task);
 389 }
 390
 391 static gchar **
 392 g_simple_proxy_resolver_lookup_finish (GProxyResolver  *resolver,
 393                                        GAsyncResult    *result,
 394                                        GError         **error)
 395 {
 396   g_return_val_if_fail (g_task_is_valid (result, resolver), NULL);
 397
 398   return g_task_propagate_pointer (G_TASK (result), error);
 399 }
 400
 401 static void
 402 g_simple_proxy_resolver_class_init (GSimpleProxyResolverClass *resolver_class)
 403 {
 404   GObjectClass *object_class = G_OBJECT_CLASS (resolver_class);
 405
 406   object_class->get_property = g_simple_proxy_resolver_get_property;
 407   object_class->set_property = g_simple_proxy_resolver_set_property;
 408   object_class->finalize = g_simple_proxy_resolver_finalize;
 409
 410   /**
 411    * GSimpleProxyResolver:default-proxy:
 412    *
 413    * The default proxy URI that will be used for any URI that doesn't
 414    * match #GSimpleProxyResolver:ignore-hosts, and doesn't match any
 415    * of the schemes set with g_simple_proxy_resolver_set_uri_proxy().
 416    *
 417    * Note that as a special case, if this URI starts with
 418    * "socks://", #GSimpleProxyResolver will treat it as referring
 419    * to all three of the socks5, socks4a, and socks4 proxy types.
 420    */
 421   g_object_class_install_property (object_class, PROP_DEFAULT_PROXY,
 422                                    g_param_spec_string ("default-proxy",
 423                                                         P_("Default proxy"),
 424                                                         P_("The default proxy URI"),
 425                                                         NULL,
 426                                                         G_PARAM_READWRITE |
 427                                                         G_PARAM_STATIC_STRINGS));
 428
 429   /**
 430    * GSimpleProxyResolver:ignore-hosts:
 431    *
 432    * A list of hostnames and IP addresses that the resolver should
 433    * allow direct connections to.
 434    *
 435    * Entries can be in one of 4 formats:
 436    *
 437    * - A hostname, such as "example.com", ".example.com", or
 438    *   "*.example.com", any of which match "example.com" or
 439    *   any subdomain of it.
 440    *
 441    * - An IPv4 or IPv6 address, such as "192.168.1.1",
 442    *   which matches only that address.
 443    *
 444    * - A hostname or IP address followed by a port, such as
 445    *   "example.com:80", which matches whatever the hostname or IP
 446    *   address would match, but only for URLs with the (explicitly)
 447    *   indicated port. In the case of an IPv6 address, the address
 448    *   part must appear in brackets: "[::1]:443"
 449    *
 450    * - An IP address range, given by a base address and prefix length,
 451    *   such as "fe80::/10", which matches any address in that range.
 452    *
 453    * Note that when dealing with Unicode hostnames, the matching is
 454    * done against the ASCII form of the name.
 455    *
 456    * Also note that hostname exclusions apply only to connections made
 457    * to hosts identified by name, and IP address exclusions apply only
 458    * to connections made to hosts identified by address. That is, if
 459    * example.com has an address of 192.168.1.1, and the :ignore-hosts list
 460    * contains only "192.168.1.1", then a connection to "example.com"
 461    * (eg, via a #GNetworkAddress) will use the proxy, and a connection to
 462    * "192.168.1.1" (eg, via a #GInetSocketAddress) will not.
 463    *
 464    * These rules match the "ignore-hosts"/"noproxy" rules most
 465    * commonly used by other applications.
 466    */
 467   g_object_class_install_property (object_class, PROP_IGNORE_HOSTS,
 468                                    g_param_spec_boxed ("ignore-hosts",
 469                                                        P_("Ignore hosts"),
 470                                                        P_("Hosts that will not use the proxy"),
 471                                                        G_TYPE_STRV,
 472                                                        G_PARAM_READWRITE |
 473                                                        G_PARAM_STATIC_STRINGS));
 474
 475 }
 476
 477 static void
 478 g_simple_proxy_resolver_iface_init (GProxyResolverInterface *iface)
 479 {
 480   iface->lookup = g_simple_proxy_resolver_lookup;
 481   iface->lookup_async = g_simple_proxy_resolver_lookup_async;
 482   iface->lookup_finish = g_simple_proxy_resolver_lookup_finish;
 483 }
 484
 485 /**
 486  * g_simple_proxy_resolver_new:
 487  * @default_proxy: (nullable): the default proxy to use, eg
 488  *     "socks://192.168.1.1"
 489  * @ignore_hosts: (nullable): an optional list of hosts/IP addresses
 490  *     to not use a proxy for.
 491  *
 492  * Creates a new #GSimpleProxyResolver. See
 493  * #GSimpleProxyResolver:default-proxy and
 494  * #GSimpleProxyResolver:ignore-hosts for more details on how the
 495  * arguments are interpreted.
 496  *
 497  * Returns: (transfer full) a new #GSimpleProxyResolver
 498  *
 499  * Since: 2.36
 500  */
 501 GProxyResolver *
 502 g_simple_proxy_resolver_new (const gchar  *default_proxy,
 503                              gchar       **ignore_hosts)
 504 {
 505   return g_object_new (G_TYPE_SIMPLE_PROXY_RESOLVER,
 506                        "default-proxy", default_proxy,
 507                        "ignore-hosts", ignore_hosts,
 508                        NULL);
 509 }
 510
 511 /**
 512  * g_simple_proxy_resolver_set_default_proxy:
 513  * @resolver: a #GSimpleProxyResolver
 514  * @default_proxy: the default proxy to use
 515  *
 516  * Sets the default proxy on @resolver, to be used for any URIs that
 517  * don't match #GSimpleProxyResolver:ignore-hosts or a proxy set
 518  * via g_simple_proxy_resolver_set_uri_proxy().
 519  *
 520  * If @default_proxy starts with "socks://",
 521  * #GSimpleProxyResolver will treat it as referring to all three of
 522  * the socks5, socks4a, and socks4 proxy types.
 523  *
 524  * Since: 2.36
 525  */
 526 void
 527 g_simple_proxy_resolver_set_default_proxy (GSimpleProxyResolver *resolver,
 528                                            const gchar          *default_proxy)
 529 {
 530   g_return_if_fail (G_IS_SIMPLE_PROXY_RESOLVER (resolver));
 531
 532   g_free (resolver->priv->default_proxy);
 533   resolver->priv->default_proxy = g_strdup (default_proxy);
 534   g_object_notify (G_OBJECT (resolver), "default-proxy");
 535 }
 536
 537 /**
 538  * g_simple_proxy_resolver_set_ignore_hosts:
 539  * @resolver: a #GSimpleProxyResolver
 540  * @ignore_hosts: %NULL-terminated list of hosts/IP addresses
 541  *     to not use a proxy for
 542  *
 543  * Sets the list of ignored hosts.
 544  *
 545  * See #GSimpleProxyResolver:ignore-hosts for more details on how the
 546  * @ignore_hosts argument is interpreted.
 547  *
 548  * Since: 2.36
 549  */
 550 void
 551 g_simple_proxy_resolver_set_ignore_hosts (GSimpleProxyResolver  *resolver,
 552                                           gchar                **ignore_hosts)
 553 {
 554   g_return_if_fail (G_IS_SIMPLE_PROXY_RESOLVER (resolver));
 555
 556   g_strfreev (resolver->priv->ignore_hosts);
 557   resolver->priv->ignore_hosts = g_strdupv (ignore_hosts);
 558   reparse_ignore_hosts (resolver);
 559   g_object_notify (G_OBJECT (resolver), "ignore-hosts");
 560 }
 561
 562 /**
 563  * g_simple_proxy_resolver_set_uri_proxy:
 564  * @resolver: a #GSimpleProxyResolver
 565  * @uri_scheme: the URI scheme to add a proxy for
 566  * @proxy: the proxy to use for @uri_scheme
 567  *
 568  * Adds a URI-scheme-specific proxy to @resolver; URIs whose scheme
 569  * matches @uri_scheme (and which don't match
 570  * #GSimpleProxyResolver:ignore-hosts) will be proxied via @proxy.
 571  *
 572  * As with #GSimpleProxyResolver:default-proxy, if @proxy starts with
 573  * "socks://", #GSimpleProxyResolver will treat it
 574  * as referring to all three of the socks5, socks4a, and socks4 proxy
 575  * types.
 576  *
 577  * Since: 2.36
 578  */
 579 void
 580 g_simple_proxy_resolver_set_uri_proxy (GSimpleProxyResolver *resolver,
 581                                        const gchar          *uri_scheme,
 582                                        const gchar          *proxy)
 583 {
 584   g_return_if_fail (G_IS_SIMPLE_PROXY_RESOLVER (resolver));
 585
 586   g_hash_table_replace (resolver->priv->uri_proxies,
 587                         g_ascii_strdown (uri_scheme, -1),
 588                         g_strdup (proxy));
 589 }