Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame^] | 1 | // Copyright (c) 2012 The Chromium OS 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 "shill/config80211.h" |
| 6 | |
| 7 | #include <ctype.h> |
| 8 | |
| 9 | #include <netlink/msg.h> |
| 10 | |
| 11 | #include <map> |
| 12 | #include <sstream> |
| 13 | #include <string> |
| 14 | |
| 15 | #include <base/memory/weak_ptr.h> |
| 16 | #include <base/stringprintf.h> |
| 17 | |
| 18 | #include "shill/io_handler.h" |
| 19 | #include "shill/logging.h" |
| 20 | #include "shill/nl80211_socket.h" |
| 21 | #include "shill/scope_logger.h" |
| 22 | #include "shill/user_bound_nlmessage.h" |
| 23 | |
| 24 | using base::Bind; |
| 25 | using base::LazyInstance; |
| 26 | using base::StringAppendF; |
| 27 | using base::StringPrintf; |
| 28 | using std::map; |
| 29 | using std::string; |
| 30 | |
| 31 | namespace shill { |
| 32 | |
| 33 | namespace { |
| 34 | LazyInstance<Config80211> g_config80211 = LAZY_INSTANCE_INITIALIZER; |
| 35 | LazyInstance<Callback80211Object> g_callback80211 = LAZY_INSTANCE_INITIALIZER; |
| 36 | } // namespace |
| 37 | |
| 38 | map<Config80211::EventType, std::string> *Config80211::event_types_ = NULL; |
| 39 | |
| 40 | Config80211::Config80211() |
| 41 | : dispatcher_(NULL), |
| 42 | weak_ptr_factory_(this), |
| 43 | dispatcher_callback_(Bind(&Config80211::HandleIncomingEvents, |
| 44 | weak_ptr_factory_.GetWeakPtr())), |
| 45 | sock_(NULL) { |
| 46 | } |
| 47 | |
| 48 | Config80211::~Config80211() { |
| 49 | // Since Config80211 is a singleton, it should be safe to delete a static |
| 50 | // member. |
| 51 | delete event_types_; |
| 52 | event_types_ = NULL; |
| 53 | } |
| 54 | |
| 55 | Config80211 *Config80211::GetInstance() { |
| 56 | return g_config80211.Pointer(); |
| 57 | } |
| 58 | |
| 59 | bool Config80211::Init(EventDispatcher *dispatcher) { |
| 60 | if (!sock_) { |
| 61 | sock_ = new Nl80211Socket; |
| 62 | if (!sock_) { |
| 63 | LOG(ERROR) << "No memory"; |
| 64 | return false; |
| 65 | } |
| 66 | |
| 67 | if (!sock_->Init()) { |
| 68 | return false; |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | if (!event_types_) { |
| 73 | event_types_ = new std::map<EventType, std::string>; |
| 74 | (*event_types_)[Config80211::kEventTypeConfig] = "config"; |
| 75 | (*event_types_)[Config80211::kEventTypeScan] = "scan"; |
| 76 | (*event_types_)[Config80211::kEventTypeRegulatory] = "regulatory"; |
| 77 | (*event_types_)[Config80211::kEventTypeMlme] = "mlme"; |
| 78 | } |
| 79 | |
| 80 | // Install ourselves in the shill mainloop so we receive messages on the |
| 81 | // nl80211 socket. |
| 82 | dispatcher_ = dispatcher; |
| 83 | if (dispatcher_) { |
| 84 | dispatcher_handler_.reset( |
| 85 | dispatcher_->CreateReadyHandler(GetFd(), |
| 86 | IOHandler::kModeInput, |
| 87 | dispatcher_callback_)); |
| 88 | } |
| 89 | return true; |
| 90 | } |
| 91 | |
| 92 | // static |
| 93 | bool Config80211::GetEventTypeString(EventType type, string *value) { |
| 94 | if (!value) { |
| 95 | LOG(ERROR) << "NULL |value|"; |
| 96 | return false; |
| 97 | } |
| 98 | if (!event_types_) { |
| 99 | LOG(ERROR) << "NULL |event_types_|"; |
| 100 | return false; |
| 101 | } |
| 102 | |
| 103 | map<EventType, string>::iterator match = (*event_types_).find(type); |
| 104 | if (match == (*event_types_).end()) { |
| 105 | LOG(ERROR) << "Event type " << type << " not found"; |
| 106 | return false; |
| 107 | } |
| 108 | *value = match->second; |
| 109 | return true; |
| 110 | } |
| 111 | |
| 112 | bool Config80211::SubscribeToEvents(EventType type) { |
| 113 | string group_name; |
| 114 | |
| 115 | if (!GetEventTypeString(type, &group_name)) { |
| 116 | return false; |
| 117 | } |
| 118 | if (!sock_->AddGroupMembership(group_name)) { |
| 119 | return false; |
| 120 | } |
| 121 | |
| 122 | // No sequence checking for multicast messages. |
| 123 | if (!sock_->DisableSequenceChecking()) { |
| 124 | return false; |
| 125 | } |
| 126 | |
| 127 | // Install the global NetLink Callback for messages along with a parameter. |
| 128 | // The Netlink Callback's parameter is passed to 'C' as a 'void *'. |
| 129 | if (!sock_->SetNetlinkCallback(OnNlMessageReceived, |
| 130 | static_cast<void *>( |
| 131 | const_cast<Config80211::Callback *>( |
| 132 | &default_callback_)))) { |
| 133 | return false; |
| 134 | } |
| 135 | return true; |
| 136 | } |
| 137 | |
| 138 | void Config80211::HandleIncomingEvents(int unused_fd) { |
| 139 | sock_->GetMessages(); |
| 140 | } |
| 141 | |
| 142 | // NOTE: the "struct nl_msg" declaration, below, is a complete fabrication |
| 143 | // (but one consistent with the nl_socket_modify_cb call to which |
| 144 | // |OnNlMessageReceived| is a parameter). |raw_message| is actually a |
| 145 | // "struct sk_buff" but that data type is only visible in the kernel. We'll |
| 146 | // scrub this erroneous datatype with the "nlmsg_hdr" call, below, which |
| 147 | // extracts an nlmsghdr pointer from |raw_message|. |
| 148 | int Config80211::OnNlMessageReceived(struct nl_msg *raw_message, |
| 149 | void *user_callback_object) { |
| 150 | SLOG(WiFi, 6) << "\t Entering " << __func__ |
| 151 | << "( msg:" << raw_message |
| 152 | << ", cb:" << user_callback_object << ")"; |
| 153 | |
| 154 | string output("@"); |
| 155 | |
| 156 | nlmsghdr *msg = nlmsg_hdr(raw_message); |
| 157 | |
| 158 | scoped_ptr<UserBoundNlMessage> message( |
| 159 | UserBoundNlMessageFactory::CreateMessage(msg)); |
| 160 | if (message == NULL) { |
| 161 | output.append("unknown event"); |
| 162 | } else { |
| 163 | if (user_callback_object) { |
| 164 | Config80211::Callback *bound_object = |
| 165 | static_cast<Config80211::Callback *> (user_callback_object); |
| 166 | if (!bound_object->is_null()) { |
| 167 | bound_object->Run(*message); |
| 168 | } |
| 169 | } |
| 170 | StringAppendF(&output, "%s", message->ToString().c_str()); |
| 171 | } |
| 172 | |
| 173 | SLOG(WiFi, 5) << output; |
| 174 | |
| 175 | return NL_SKIP; // Skip current message, continue parsing buffer. |
| 176 | } |
| 177 | |
| 178 | // Callback80211Object |
| 179 | |
| 180 | Callback80211Object::Callback80211Object() : |
| 181 | config80211_(NULL), |
| 182 | weak_ptr_factory_(this) { |
| 183 | } |
| 184 | |
| 185 | Callback80211Object::~Callback80211Object() { |
| 186 | DeinstallAsCallback(); |
| 187 | } |
| 188 | |
| 189 | void Callback80211Object::Config80211MessageCallback( |
| 190 | const UserBoundNlMessage &msg) { |
| 191 | SLOG(WiFi, 2) << "Received " << msg.GetMessageTypeString() |
| 192 | << " (" << + msg.GetMessageType() << ")"; |
| 193 | scoped_ptr<UserBoundNlMessage::AttributeNameIterator> i; |
| 194 | |
| 195 | for (i.reset(msg.GetAttributeNameIterator()); !i->AtEnd(); i->Advance()) { |
| 196 | string value = "<unknown>"; |
| 197 | msg.GetAttributeString(i->GetName(), &value); |
| 198 | SLOG(WiFi, 2) << " Attr:" << msg.StringFromAttributeName(i->GetName()) |
| 199 | << "=" << value |
| 200 | << " Type:" << msg.GetAttributeTypeString(i->GetName()); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | bool Callback80211Object::InstallAsCallback() { |
| 205 | if (config80211_) { |
| 206 | Config80211::Callback callback = |
| 207 | Bind(&Callback80211Object::Config80211MessageCallback, |
| 208 | weak_ptr_factory_.GetWeakPtr()); |
| 209 | config80211_->SetDefaultCallback(callback); |
| 210 | return true; |
| 211 | } |
| 212 | return false; |
| 213 | } |
| 214 | |
| 215 | bool Callback80211Object::DeinstallAsCallback() { |
| 216 | if (config80211_) { |
| 217 | config80211_->UnsetDefaultCallback(); |
| 218 | return true; |
| 219 | } |
| 220 | return false; |
| 221 | } |
| 222 | |
| 223 | Callback80211Object *Callback80211Object::GetInstance() { |
| 224 | return g_callback80211.Pointer(); |
| 225 | } |
| 226 | |
| 227 | } // namespace shill. |