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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(list[i].address(),
     71                                                               list[i].port(),
     72                                                               &address)) {
     73       net_address_list->clear();
     74       return;
     75     }
     76     net_address_list->push_back(address);
     77   }
     78 }
     79 
     80 }  // namespace
     81 
     82 PepperHostResolverMessageFilter::PepperHostResolverMessageFilter(
     83     BrowserPpapiHostImpl* host,
     84     PP_Instance instance,
     85     bool private_api)
     86     : external_plugin_(host->external_plugin()),
     87       private_api_(private_api),
     88       render_process_id_(0),
     89       render_view_id_(0) {
     90   DCHECK(host);
     91 
     92   if (!host->GetRenderViewIDsForInstance(
     93           instance,
     94           &render_process_id_,
     95           &render_view_id_)) {
     96     NOTREACHED();
     97   }
     98 }
     99 
    100 PepperHostResolverMessageFilter::~PepperHostResolverMessageFilter() {
    101 }
    102 
    103 scoped_refptr<base::TaskRunner>
    104 PepperHostResolverMessageFilter::OverrideTaskRunnerForMessage(
    105     const IPC::Message& message) {
    106   if (message.type() == PpapiHostMsg_HostResolver_Resolve::ID)
    107     return BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI);
    108   return NULL;
    109 }
    110 
    111 int32_t PepperHostResolverMessageFilter::OnResourceMessageReceived(
    112     const IPC::Message& msg,
    113     ppapi::host::HostMessageContext* context) {
    114   IPC_BEGIN_MESSAGE_MAP(PepperHostResolverMessageFilter, msg)
    115     PPAPI_DISPATCH_HOST_RESOURCE_CALL(
    116         PpapiHostMsg_HostResolver_Resolve, OnMsgResolve)
    117   IPC_END_MESSAGE_MAP()
    118   return PP_ERROR_FAILED;
    119 }
    120 
    121 int32_t PepperHostResolverMessageFilter::OnMsgResolve(
    122     const ppapi::host::HostMessageContext* context,
    123     const ppapi::HostPortPair& host_port,
    124     const PP_HostResolver_Private_Hint& hint) {
    125   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
    126 
    127   // Check plugin permissions.
    128   SocketPermissionRequest request(
    129       SocketPermissionRequest::RESOLVE_HOST, host_port.host, host_port.port);
    130   RenderViewHost* render_view_host =
    131       RenderViewHost::FromID(render_process_id_, render_view_id_);
    132   if (!render_view_host ||
    133       !pepper_socket_utils::CanUseSocketAPIs(external_plugin_,
    134                                              private_api_,
    135                                              request,
    136                                              render_view_host)) {
    137     return PP_ERROR_NOACCESS;
    138   }
    139 
    140   RenderProcessHost* render_process_host =
    141       RenderProcessHost::FromID(render_process_id_);
    142   if (!render_process_host)
    143     return PP_ERROR_FAILED;
    144   BrowserContext* browser_context = render_process_host->GetBrowserContext();
    145   if (!browser_context || !browser_context->GetResourceContext())
    146     return PP_ERROR_FAILED;
    147 
    148   BrowserThread::PostTask(
    149       BrowserThread::IO, FROM_HERE,
    150       base::Bind(&PepperHostResolverMessageFilter::DoResolve, this,
    151                  context->MakeReplyMessageContext(),
    152                  host_port,
    153                  hint,
    154                  browser_context->GetResourceContext()));
    155   return PP_OK_COMPLETIONPENDING;
    156 }
    157 
    158 void PepperHostResolverMessageFilter::DoResolve(
    159     const ReplyMessageContext& context,
    160     const ppapi::HostPortPair& host_port,
    161     const PP_HostResolver_Private_Hint& hint,
    162     ResourceContext* resource_context) {
    163   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
    164 
    165   net::HostResolver* host_resolver = resource_context->GetHostResolver();
    166   if (!host_resolver) {
    167     SendResolveError(PP_ERROR_FAILED, context);
    168     return;
    169   }
    170 
    171   net::HostResolver::RequestInfo request_info(
    172       net::HostPortPair(host_port.host, host_port.port));
    173   PrepareRequestInfo(hint, &request_info);
    174 
    175   scoped_ptr<ReplyMessageContext> bound_info(new ReplyMessageContext(context));
    176 
    177   // The lookup request will delete itself on completion.
    178   PepperLookupRequest<ReplyMessageContext>* lookup_request =
    179       new PepperLookupRequest<ReplyMessageContext>(
    180           host_resolver,
    181           request_info,
    182           bound_info.release(),
    183           base::Bind(&PepperHostResolverMessageFilter::OnLookupFinished, this));
    184   lookup_request->Start();
    185 }
    186 
    187 void PepperHostResolverMessageFilter::OnLookupFinished(
    188     int net_result,
    189     const net::AddressList& addresses,
    190     const ReplyMessageContext& context) {
    191   if (net_result != net::OK) {
    192     SendResolveError(NetErrorToPepperError(net_result), context);
    193   } else {
    194     const std::string& canonical_name = addresses.canonical_name();
    195     NetAddressList net_address_list;
    196     CreateNetAddressListFromAddressList(addresses, &net_address_list);
    197     if (net_address_list.empty())
    198       SendResolveError(PP_ERROR_FAILED, context);
    199     else
    200       SendResolveReply(PP_OK, canonical_name, net_address_list, context);
    201   }
    202 }
    203 
    204 void PepperHostResolverMessageFilter::SendResolveReply(
    205     int32_t result,
    206     const std::string& canonical_name,
    207     const NetAddressList& net_address_list,
    208     const ReplyMessageContext& context) {
    209   ReplyMessageContext reply_context = context;
    210   reply_context.params.set_result(result);
    211   SendReply(reply_context,
    212             PpapiPluginMsg_HostResolver_ResolveReply(
    213                 canonical_name, net_address_list));
    214 }
    215 
    216 void PepperHostResolverMessageFilter::SendResolveError(
    217     int32_t error,
    218     const ReplyMessageContext& context) {
    219   SendResolveReply(error, std::string(), NetAddressList(), context);
    220 }
    221 
    222 }  // namespace content
    223