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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "content/browser/renderer_host/pepper/pepper_host_resolver_message_filter.h"
      6 
      7 #include "base/logging.h"
      8 #include "base/memory/scoped_ptr.h"
      9 #include "content/browser/renderer_host/pepper/browser_ppapi_host_impl.h"
     10 #include "content/browser/renderer_host/pepper/pepper_lookup_request.h"
     11 #include "content/browser/renderer_host/pepper/pepper_socket_utils.h"
     12 #include "content/public/browser/browser_context.h"
     13 #include "content/public/browser/browser_thread.h"
     14 #include "content/public/browser/render_process_host.h"
     15 #include "content/public/browser/resource_context.h"
     16 #include "content/public/common/socket_permission_request.h"
     17 #include "net/base/address_list.h"
     18 #include "net/dns/host_resolver.h"
     19 #include "ppapi/c/pp_errors.h"
     20 #include "ppapi/c/private/ppb_host_resolver_private.h"
     21 #include "ppapi/c/private/ppb_net_address_private.h"
     22 #include "ppapi/host/dispatch_host_message.h"
     23 #include "ppapi/host/error_conversion.h"
     24 #include "ppapi/host/host_message_context.h"
     25 #include "ppapi/proxy/ppapi_messages.h"
     26 #include "ppapi/shared_impl/private/net_address_private_impl.h"
     27 
     28 using ppapi::host::NetErrorToPepperError;
     29 using ppapi::host::ReplyMessageContext;
     30 
     31 namespace content {
     32 
     33 namespace {
     34 
     35 void PrepareRequestInfo(const PP_HostResolver_Private_Hint& hint,
     36                         net::HostResolver::RequestInfo* request_info) {
     37   DCHECK(request_info);
     38 
     39   net::AddressFamily address_family;
     40   switch (hint.family) {
     41     case PP_NETADDRESSFAMILY_PRIVATE_IPV4:
     42       address_family = net::ADDRESS_FAMILY_IPV4;
     43       break;
     44     case PP_NETADDRESSFAMILY_PRIVATE_IPV6:
     45       address_family = net::ADDRESS_FAMILY_IPV6;
     46       break;
     47     default:
     48       address_family = net::ADDRESS_FAMILY_UNSPECIFIED;
     49   }
     50   request_info->set_address_family(address_family);
     51 
     52   net::HostResolverFlags host_resolver_flags = 0;
     53   if (hint.flags & PP_HOST_RESOLVER_PRIVATE_FLAGS_CANONNAME)
     54     host_resolver_flags |= net::HOST_RESOLVER_CANONNAME;
     55   if (hint.flags & PP_HOST_RESOLVER_PRIVATE_FLAGS_LOOPBACK_ONLY)
     56     host_resolver_flags |= net::HOST_RESOLVER_LOOPBACK_ONLY;
     57   request_info->set_host_resolver_flags(host_resolver_flags);
     58 }
     59 
     60 void CreateNetAddressListFromAddressList(
     61     const net::AddressList& list,
     62     std::vector<PP_NetAddress_Private>* net_address_list) {
     63   DCHECK(net_address_list);
     64 
     65   net_address_list->clear();
     66   net_address_list->reserve(list.size());
     67 
     68   PP_NetAddress_Private address;
     69   for (size_t i = 0; i < list.size(); ++i) {
     70     if (!ppapi::NetAddressPrivateImpl::IPEndPointToNetAddress(
     71             list[i].address(), list[i].port(), &address)) {
     72       net_address_list->clear();
     73       return;
     74     }
     75     net_address_list->push_back(address);
     76   }
     77 }
     78 
     79 }  // namespace
     80 
     81 PepperHostResolverMessageFilter::PepperHostResolverMessageFilter(
     82     BrowserPpapiHostImpl* host,
     83     PP_Instance instance,
     84     bool private_api)
     85     : external_plugin_(host->external_plugin()),
     86       private_api_(private_api),
     87       render_process_id_(0),
     88       render_frame_id_(0) {
     89   DCHECK(host);
     90 
     91   if (!host->GetRenderFrameIDsForInstance(
     92           instance, &render_process_id_, &render_frame_id_)) {
     93     NOTREACHED();
     94   }
     95 }
     96 
     97 PepperHostResolverMessageFilter::~PepperHostResolverMessageFilter() {}
     98 
     99 scoped_refptr<base::TaskRunner>
    100 PepperHostResolverMessageFilter::OverrideTaskRunnerForMessage(
    101     const IPC::Message& message) {
    102   if (message.type() == PpapiHostMsg_HostResolver_Resolve::ID)
    103     return BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI);
    104   return NULL;
    105 }
    106 
    107 int32_t PepperHostResolverMessageFilter::OnResourceMessageReceived(
    108     const IPC::Message& msg,
    109     ppapi::host::HostMessageContext* context) {
    110   PPAPI_BEGIN_MESSAGE_MAP(PepperHostResolverMessageFilter, msg)
    111     PPAPI_DISPATCH_HOST_RESOURCE_CALL(PpapiHostMsg_HostResolver_Resolve,
    112                                       OnMsgResolve)
    113   PPAPI_END_MESSAGE_MAP()
    114   return PP_ERROR_FAILED;
    115 }
    116 
    117 int32_t PepperHostResolverMessageFilter::OnMsgResolve(
    118     const ppapi::host::HostMessageContext* context,
    119     const ppapi::HostPortPair& host_port,
    120     const PP_HostResolver_Private_Hint& hint) {
    121   DCHECK_CURRENTLY_ON(BrowserThread::UI);
    122 
    123   // Check plugin permissions.
    124   SocketPermissionRequest request(
    125       SocketPermissionRequest::RESOLVE_HOST, host_port.host, host_port.port);
    126   if (!pepper_socket_utils::CanUseSocketAPIs(external_plugin_,
    127                                              private_api_,
    128                                              &request,
    129                                              render_process_id_,
    130                                              render_frame_id_)) {
    131     return PP_ERROR_NOACCESS;
    132   }
    133 
    134   RenderProcessHost* render_process_host =
    135       RenderProcessHost::FromID(render_process_id_);
    136   if (!render_process_host)
    137     return PP_ERROR_FAILED;
    138   BrowserContext* browser_context = render_process_host->GetBrowserContext();
    139   if (!browser_context || !browser_context->GetResourceContext())
    140     return PP_ERROR_FAILED;
    141 
    142   BrowserThread::PostTask(
    143       BrowserThread::IO,
    144       FROM_HERE,
    145       base::Bind(&PepperHostResolverMessageFilter::DoResolve,
    146                  this,
    147                  context->MakeReplyMessageContext(),
    148                  host_port,
    149                  hint,
    150                  browser_context->GetResourceContext()));
    151   return PP_OK_COMPLETIONPENDING;
    152 }
    153 
    154 void PepperHostResolverMessageFilter::DoResolve(
    155     const ReplyMessageContext& context,
    156     const ppapi::HostPortPair& host_port,
    157     const PP_HostResolver_Private_Hint& hint,
    158     ResourceContext* resource_context) {
    159   DCHECK_CURRENTLY_ON(BrowserThread::IO);
    160 
    161   net::HostResolver* host_resolver = resource_context->GetHostResolver();
    162   if (!host_resolver) {
    163     SendResolveError(PP_ERROR_FAILED, context);
    164     return;
    165   }
    166 
    167   net::HostResolver::RequestInfo request_info(
    168       net::HostPortPair(host_port.host, host_port.port));
    169   PrepareRequestInfo(hint, &request_info);
    170 
    171   scoped_ptr<ReplyMessageContext> bound_info(new ReplyMessageContext(context));
    172 
    173   // The lookup request will delete itself on completion.
    174   PepperLookupRequest<ReplyMessageContext>* lookup_request =
    175       new PepperLookupRequest<ReplyMessageContext>(
    176           host_resolver,
    177           request_info,
    178           net::DEFAULT_PRIORITY,
    179           bound_info.release(),
    180           base::Bind(&PepperHostResolverMessageFilter::OnLookupFinished, this));
    181   lookup_request->Start();
    182 }
    183 
    184 void PepperHostResolverMessageFilter::OnLookupFinished(
    185     int net_result,
    186     const net::AddressList& addresses,
    187     const ReplyMessageContext& context) {
    188   if (net_result != net::OK) {
    189     SendResolveError(NetErrorToPepperError(net_result), context);
    190   } else {
    191     const std::string& canonical_name = addresses.canonical_name();
    192     NetAddressList net_address_list;
    193     CreateNetAddressListFromAddressList(addresses, &net_address_list);
    194     if (net_address_list.empty())
    195       SendResolveError(PP_ERROR_FAILED, context);
    196     else
    197       SendResolveReply(PP_OK, canonical_name, net_address_list, context);
    198   }
    199 }
    200 
    201 void PepperHostResolverMessageFilter::SendResolveReply(
    202     int32_t result,
    203     const std::string& canonical_name,
    204     const NetAddressList& net_address_list,
    205     const ReplyMessageContext& context) {
    206   ReplyMessageContext reply_context = context;
    207   reply_context.params.set_result(result);
    208   SendReply(reply_context,
    209             PpapiPluginMsg_HostResolver_ResolveReply(canonical_name,
    210                                                      net_address_list));
    211 }
    212 
    213 void PepperHostResolverMessageFilter::SendResolveError(
    214     int32_t error,
    215     const ReplyMessageContext& context) {
    216   SendResolveReply(error, std::string(), NetAddressList(), context);
    217 }
    218 
    219 }  // namespace content
    220