Wade Guthrie | f162f8b | 2013-02-27 14:13:55 -0800 | [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/netlink_attribute.h" |
| 6 | |
| 7 | #include <netlink/attr.h> |
| 8 | |
| 9 | #include <string> |
| 10 | |
| 11 | #include <base/format_macros.h> |
| 12 | #include <base/stringprintf.h> |
| 13 | |
| 14 | #include "shill/attribute_list.h" |
| 15 | #include "shill/control_netlink_attribute.h" |
| 16 | #include "shill/logging.h" |
| 17 | #include "shill/nl80211_attribute.h" |
Wade Guthrie | f162f8b | 2013-02-27 14:13:55 -0800 | [diff] [blame] | 18 | |
| 19 | using std::string; |
| 20 | |
| 21 | using base::StringAppendF; |
| 22 | using base::StringPrintf; |
| 23 | |
| 24 | namespace shill { |
| 25 | |
| 26 | // This is a type-corrected copy of |nla_for_each_nested| from libnl. |
| 27 | #define nla_for_each_nested_type_corrected(pos, nla, rem) \ |
| 28 | for (pos = reinterpret_cast<struct nlattr *>(nla_data(nla)), \ |
| 29 | rem = nla_len(nla); \ |
| 30 | nla_ok(pos, rem); \ |
| 31 | pos = nla_next(pos, &(rem))) |
| 32 | |
| 33 | NetlinkAttribute::NetlinkAttribute(int id, |
| 34 | const char *id_string, |
| 35 | Type datatype, |
| 36 | const char *datatype_string) |
| 37 | : has_a_value_(false), id_(id), id_string_(id_string), datatype_(datatype), |
| 38 | datatype_string_(datatype_string) {} |
| 39 | |
| 40 | // static |
| 41 | NetlinkAttribute *NetlinkAttribute::NewNl80211AttributeFromId(int id) { |
| 42 | scoped_ptr<NetlinkAttribute> attr; |
| 43 | switch (id) { |
| 44 | case NL80211_ATTR_COOKIE: |
| 45 | attr.reset(new Nl80211AttributeCookie()); |
| 46 | break; |
| 47 | case NL80211_ATTR_CQM: |
| 48 | attr.reset(new Nl80211AttributeCqm()); |
| 49 | break; |
| 50 | case NL80211_ATTR_DISCONNECTED_BY_AP: |
| 51 | attr.reset(new Nl80211AttributeDisconnectedByAp()); |
| 52 | break; |
| 53 | case NL80211_ATTR_DURATION: |
| 54 | attr.reset(new Nl80211AttributeDuration()); |
| 55 | break; |
| 56 | case NL80211_ATTR_FRAME: |
| 57 | attr.reset(new Nl80211AttributeFrame()); |
| 58 | break; |
| 59 | case NL80211_ATTR_GENERATION: |
| 60 | attr.reset(new Nl80211AttributeGeneration()); |
| 61 | break; |
| 62 | case NL80211_ATTR_IFINDEX: |
| 63 | attr.reset(new Nl80211AttributeIfindex()); |
| 64 | break; |
| 65 | case NL80211_ATTR_KEY_IDX: |
| 66 | attr.reset(new Nl80211AttributeKeyIdx()); |
| 67 | break; |
| 68 | case NL80211_ATTR_KEY_SEQ: |
| 69 | attr.reset(new Nl80211AttributeKeySeq()); |
| 70 | break; |
| 71 | case NL80211_ATTR_KEY_TYPE: |
| 72 | attr.reset(new Nl80211AttributeKeyType()); |
| 73 | break; |
| 74 | case NL80211_ATTR_MAC: |
| 75 | attr.reset(new Nl80211AttributeMac()); |
| 76 | break; |
| 77 | case NL80211_ATTR_REASON_CODE: |
| 78 | attr.reset(new Nl80211AttributeReasonCode()); |
| 79 | break; |
| 80 | case NL80211_ATTR_REG_ALPHA2: |
| 81 | attr.reset(new Nl80211AttributeRegAlpha2()); |
| 82 | break; |
| 83 | case NL80211_ATTR_REG_INITIATOR: |
| 84 | attr.reset(new Nl80211AttributeRegInitiator()); |
| 85 | break; |
| 86 | case NL80211_ATTR_REG_TYPE: |
| 87 | attr.reset(new Nl80211AttributeRegType()); |
| 88 | break; |
| 89 | case NL80211_ATTR_RESP_IE: |
| 90 | attr.reset(new Nl80211AttributeRespIe()); |
| 91 | break; |
| 92 | case NL80211_ATTR_SCAN_FREQUENCIES: |
| 93 | attr.reset(new Nl80211AttributeScanFrequencies()); |
| 94 | break; |
| 95 | case NL80211_ATTR_SCAN_SSIDS: |
| 96 | attr.reset(new Nl80211AttributeScanSsids()); |
| 97 | break; |
| 98 | case NL80211_ATTR_STA_INFO: |
| 99 | attr.reset(new Nl80211AttributeStaInfo()); |
| 100 | break; |
| 101 | case NL80211_ATTR_STATUS_CODE: |
| 102 | attr.reset(new Nl80211AttributeStatusCode()); |
| 103 | break; |
| 104 | case NL80211_ATTR_SUPPORT_MESH_AUTH: |
| 105 | attr.reset(new Nl80211AttributeSupportMeshAuth()); |
| 106 | break; |
| 107 | case NL80211_ATTR_TIMED_OUT: |
| 108 | attr.reset(new Nl80211AttributeTimedOut()); |
| 109 | break; |
| 110 | case NL80211_ATTR_WIPHY_FREQ: |
| 111 | attr.reset(new Nl80211AttributeWiphyFreq()); |
| 112 | break; |
| 113 | case NL80211_ATTR_WIPHY: |
| 114 | attr.reset(new Nl80211AttributeWiphy()); |
| 115 | break; |
| 116 | case NL80211_ATTR_WIPHY_NAME: |
| 117 | attr.reset(new Nl80211AttributeWiphyName()); |
| 118 | break; |
| 119 | default: |
| 120 | attr.reset(new NetlinkAttributeGeneric(id)); |
| 121 | break; |
| 122 | } |
| 123 | return attr.release(); |
| 124 | } |
| 125 | |
| 126 | // static |
| 127 | NetlinkAttribute *NetlinkAttribute::NewControlAttributeFromId(int id) { |
| 128 | scoped_ptr<NetlinkAttribute> attr; |
| 129 | switch (id) { |
| 130 | case CTRL_ATTR_FAMILY_ID: |
| 131 | attr.reset(new ControlAttributeFamilyId()); |
| 132 | break; |
| 133 | case CTRL_ATTR_FAMILY_NAME: |
| 134 | attr.reset(new ControlAttributeFamilyName()); |
| 135 | break; |
| 136 | case CTRL_ATTR_VERSION: |
| 137 | attr.reset(new ControlAttributeVersion()); |
| 138 | break; |
| 139 | case CTRL_ATTR_HDRSIZE: |
| 140 | attr.reset(new ControlAttributeHdrSize()); |
| 141 | break; |
| 142 | case CTRL_ATTR_MAXATTR: |
| 143 | attr.reset(new ControlAttributeMaxAttr()); |
| 144 | break; |
| 145 | case CTRL_ATTR_OPS: |
| 146 | attr.reset(new ControlAttributeAttrOps()); |
| 147 | break; |
| 148 | case CTRL_ATTR_MCAST_GROUPS: |
| 149 | attr.reset(new ControlAttributeMcastGroups()); |
| 150 | break; |
| 151 | default: |
| 152 | attr.reset(new NetlinkAttributeGeneric(id)); |
| 153 | break; |
| 154 | } |
| 155 | return attr.release(); |
| 156 | } |
| 157 | |
| 158 | // Duplicate attribute data, store in map indexed on |id|. |
| 159 | bool NetlinkAttribute::InitFromNlAttr(const nlattr *other) { |
| 160 | if (!other) { |
| 161 | LOG(ERROR) << "NULL data"; |
| 162 | return false; |
| 163 | } |
| 164 | |
| 165 | data_ = ByteString( |
| 166 | reinterpret_cast<char *>(nla_data(const_cast<nlattr *>(other))), |
| 167 | nla_len(const_cast<nlattr *>(other))); |
| 168 | return true; |
| 169 | } |
| 170 | |
| 171 | bool NetlinkAttribute::GetU8Value(uint8_t *value) const { |
| 172 | LOG(ERROR) << "Attribute is not of type 'U8'"; |
| 173 | return false; |
| 174 | } |
| 175 | |
| 176 | bool NetlinkAttribute::SetU8Value(uint8_t value) { |
| 177 | LOG(ERROR) << "Attribute is not of type 'U8'"; |
| 178 | return false; |
| 179 | } |
| 180 | |
| 181 | bool NetlinkAttribute::GetU16Value(uint16_t *value) const { |
| 182 | LOG(ERROR) << "Attribute is not of type 'U16'"; |
| 183 | return false; |
| 184 | } |
| 185 | |
| 186 | bool NetlinkAttribute::SetU16Value(uint16_t value) { |
| 187 | LOG(ERROR) << "Attribute is not of type 'U16'"; |
| 188 | return false; |
| 189 | } |
| 190 | |
| 191 | bool NetlinkAttribute::GetU32Value(uint32_t *value) const { |
| 192 | LOG(ERROR) << "Attribute is not of type 'U32'"; |
| 193 | return false; |
| 194 | } |
| 195 | |
| 196 | bool NetlinkAttribute::SetU32Value(uint32_t value) { |
| 197 | LOG(ERROR) << "Attribute is not of type 'U32'"; |
| 198 | return false; |
| 199 | } |
| 200 | |
| 201 | bool NetlinkAttribute::GetU64Value(uint64_t *value) const { |
| 202 | LOG(ERROR) << "Attribute is not of type 'U64'"; |
| 203 | return false; |
| 204 | } |
| 205 | |
| 206 | bool NetlinkAttribute::SetU64Value(uint64_t value) { |
| 207 | LOG(ERROR) << "Attribute is not of type 'U64'"; |
| 208 | return false; |
| 209 | } |
| 210 | |
| 211 | bool NetlinkAttribute::GetFlagValue(bool *value) const { |
| 212 | LOG(ERROR) << "Attribute is not of type 'Flag'"; |
| 213 | return false; |
| 214 | } |
| 215 | |
| 216 | bool NetlinkAttribute::SetFlagValue(bool value) { |
| 217 | LOG(ERROR) << "Attribute is not of type 'Flag'"; |
| 218 | return false; |
| 219 | } |
| 220 | |
| 221 | bool NetlinkAttribute::GetStringValue(string *value) const { |
| 222 | LOG(ERROR) << "Attribute is not of type 'String'"; |
| 223 | return false; |
| 224 | } |
| 225 | |
| 226 | bool NetlinkAttribute::SetStringValue(string value) { |
| 227 | LOG(ERROR) << "Attribute is not of type 'String'"; |
| 228 | return false; |
| 229 | } |
| 230 | |
| 231 | bool NetlinkAttribute::GetNestedAttributeList(AttributeListRefPtr *value) { |
| 232 | LOG(ERROR) << "Attribute is not of type 'Nested'"; |
| 233 | return false; |
| 234 | } |
| 235 | |
| 236 | bool NetlinkAttribute::ConstGetNestedAttributeList( |
| 237 | AttributeListConstRefPtr *value) const { |
| 238 | LOG(ERROR) << "Attribute is not of type 'Nested'"; |
| 239 | return false; |
| 240 | } |
| 241 | |
| 242 | bool NetlinkAttribute::SetNestedHasAValue() { |
| 243 | LOG(ERROR) << "Attribute is not of type 'Nested'"; |
| 244 | return false; |
| 245 | } |
| 246 | |
| 247 | bool NetlinkAttribute::GetRawValue(ByteString *value) const { |
| 248 | LOG(ERROR) << "Attribute is not of type 'Raw'"; |
| 249 | return false; |
| 250 | } |
| 251 | |
| 252 | bool NetlinkAttribute::SetRawValue(const ByteString new_value) { |
| 253 | LOG(ERROR) << "Attribute is not of type 'Raw'"; |
| 254 | return false; |
| 255 | } |
| 256 | |
| 257 | void NetlinkAttribute::Print(int log_level, int indent) const { |
| 258 | string attribute_value; |
| 259 | SLOG(WiFi, log_level) << HeaderToPrint(indent) << " " |
| 260 | << (ToString(&attribute_value) ? attribute_value : |
| 261 | "<DOES NOT EXIST>"); |
| 262 | } |
| 263 | |
| 264 | string NetlinkAttribute::RawToString() const { |
| 265 | string output = " === RAW: "; |
| 266 | |
| 267 | if (!has_a_value_) { |
| 268 | StringAppendF(&output, "(empty)"); |
| 269 | return output; |
| 270 | } |
| 271 | |
| 272 | uint16_t length = data_.GetLength(); |
| 273 | const uint8_t *const_data = data_.GetConstData(); |
| 274 | |
| 275 | StringAppendF(&output, "len=%u", length); |
| 276 | output.append(" DATA: "); |
| 277 | for (int i =0 ; i < length; ++i) { |
| 278 | StringAppendF(&output, "[%d]=%02x ", i, *(const_data)+i); |
| 279 | } |
| 280 | output.append(" ==== "); |
| 281 | return output; |
| 282 | } |
| 283 | |
| 284 | string NetlinkAttribute::HeaderToPrint(int indent) const { |
| 285 | static const int kSpacesPerIndent = 2; |
| 286 | return StringPrintf("%*s%s(%d) %s %s=", |
| 287 | indent * kSpacesPerIndent, "", |
| 288 | id_string(), |
| 289 | id(), |
| 290 | datatype_string(), |
| 291 | ((has_a_value()) ? "": "UNINITIALIZED ")); |
| 292 | } |
| 293 | |
| 294 | ByteString NetlinkAttribute::EncodeGeneric(const unsigned char *data, |
| 295 | size_t num_bytes) const { |
Wade Guthrie | 35cb4b9 | 2013-04-19 10:46:11 -0700 | [diff] [blame^] | 296 | ByteString result; |
| 297 | if (has_a_value_) { |
| 298 | nlattr header; |
| 299 | header.nla_type = id(); |
| 300 | header.nla_len = nla_attr_size(num_bytes); |
| 301 | result = ByteString(reinterpret_cast<unsigned char *>(&header), |
| 302 | sizeof(header)); |
| 303 | result.Resize(NLA_HDRLEN); // Add padding after the header. |
| 304 | if (data && (num_bytes != 0)) { |
| 305 | result.Append(ByteString(data, num_bytes)); |
| 306 | } |
| 307 | result.Resize(nla_total_size(num_bytes)); // Add padding. |
Wade Guthrie | f162f8b | 2013-02-27 14:13:55 -0800 | [diff] [blame] | 308 | } |
Wade Guthrie | f162f8b | 2013-02-27 14:13:55 -0800 | [diff] [blame] | 309 | return result; |
| 310 | } |
| 311 | |
| 312 | // NetlinkU8Attribute |
| 313 | |
| 314 | const char NetlinkU8Attribute::kMyTypeString[] = "uint8_t"; |
| 315 | const NetlinkAttribute::Type NetlinkU8Attribute::kType = |
| 316 | NetlinkAttribute::kTypeU8; |
| 317 | |
| 318 | bool NetlinkU8Attribute::InitFromNlAttr(const nlattr *input) { |
| 319 | if (!input) { |
| 320 | LOG(ERROR) << "Null |input| parameter"; |
| 321 | return false; |
| 322 | } |
| 323 | |
| 324 | uint8_t data = NlaGetU8(input); |
| 325 | SetU8Value(data); |
| 326 | return NetlinkAttribute::InitFromNlAttr(input); |
| 327 | } |
| 328 | |
| 329 | bool NetlinkU8Attribute::GetU8Value(uint8_t *output) const { |
| 330 | if (!has_a_value_) { |
| 331 | SLOG(WiFi, 7) << "U8 attribute " << id_string() |
| 332 | << " hasn't been set to any value."; |
| 333 | return false; |
| 334 | } |
| 335 | if (output) { |
| 336 | *output = value_; |
| 337 | } |
| 338 | return true; |
| 339 | } |
| 340 | |
| 341 | bool NetlinkU8Attribute::SetU8Value(uint8_t new_value) { |
| 342 | value_ = new_value; |
| 343 | has_a_value_ = true; |
| 344 | return true; |
| 345 | } |
| 346 | |
| 347 | bool NetlinkU8Attribute::ToString(string *output) const { |
| 348 | if (!output) { |
| 349 | LOG(ERROR) << "Null |output| parameter"; |
| 350 | return false; |
| 351 | } |
| 352 | uint8_t value; |
| 353 | if (!GetU8Value(&value)) |
| 354 | return false; |
| 355 | *output = StringPrintf("%u", value); |
| 356 | return true; |
| 357 | } |
| 358 | |
| 359 | ByteString NetlinkU8Attribute::Encode() const { |
| 360 | return NetlinkAttribute::EncodeGeneric( |
| 361 | reinterpret_cast<const unsigned char *>(&value_), sizeof(value_)); |
| 362 | } |
| 363 | |
| 364 | |
| 365 | // NetlinkU16Attribute |
| 366 | |
| 367 | const char NetlinkU16Attribute::kMyTypeString[] = "uint16_t"; |
| 368 | const NetlinkAttribute::Type NetlinkU16Attribute::kType = |
| 369 | NetlinkAttribute::kTypeU16; |
| 370 | |
| 371 | bool NetlinkU16Attribute::InitFromNlAttr(const nlattr *input) { |
| 372 | if (!input) { |
| 373 | LOG(ERROR) << "Null |input| parameter"; |
| 374 | return false; |
| 375 | } |
| 376 | |
| 377 | uint16_t data = NlaGetU16(input); |
| 378 | SetU16Value(data); |
| 379 | return NetlinkAttribute::InitFromNlAttr(input); |
| 380 | } |
| 381 | |
| 382 | bool NetlinkU16Attribute::GetU16Value(uint16_t *output) const { |
| 383 | if (!has_a_value_) { |
| 384 | SLOG(WiFi, 7) << "U16 attribute " << id_string() |
| 385 | << " hasn't been set to any value."; |
| 386 | return false; |
| 387 | } |
| 388 | if (output) { |
| 389 | *output = value_; |
| 390 | } |
| 391 | return true; |
| 392 | } |
| 393 | |
| 394 | bool NetlinkU16Attribute::SetU16Value(uint16_t new_value) { |
| 395 | value_ = new_value; |
| 396 | has_a_value_ = true; |
| 397 | return true; |
| 398 | } |
| 399 | |
| 400 | bool NetlinkU16Attribute::ToString(string *output) const { |
| 401 | if (!output) { |
| 402 | LOG(ERROR) << "Null |output| parameter"; |
| 403 | return false; |
| 404 | } |
| 405 | uint16_t value; |
| 406 | if (!GetU16Value(&value)) |
| 407 | return false; |
| 408 | *output = StringPrintf("%u", value); |
| 409 | return true; |
| 410 | } |
| 411 | |
| 412 | ByteString NetlinkU16Attribute::Encode() const { |
| 413 | return NetlinkAttribute::EncodeGeneric( |
| 414 | reinterpret_cast<const unsigned char *>(&value_), sizeof(value_)); |
| 415 | } |
| 416 | |
| 417 | // NetlinkU32Attribute:: |
| 418 | |
| 419 | const char NetlinkU32Attribute::kMyTypeString[] = "uint32_t"; |
| 420 | const NetlinkAttribute::Type NetlinkU32Attribute::kType = |
| 421 | NetlinkAttribute::kTypeU32; |
| 422 | |
| 423 | bool NetlinkU32Attribute::InitFromNlAttr(const nlattr *input) { |
| 424 | if (!input) { |
| 425 | LOG(ERROR) << "Null |input| parameter"; |
| 426 | return false; |
| 427 | } |
| 428 | |
| 429 | uint32_t data = NlaGetU32(input); |
| 430 | SetU32Value(data); |
| 431 | return NetlinkAttribute::InitFromNlAttr(input); |
| 432 | } |
| 433 | |
| 434 | bool NetlinkU32Attribute::GetU32Value(uint32_t *output) const { |
| 435 | if (!has_a_value_) { |
| 436 | SLOG(WiFi, 7) << "U32 attribute " << id_string() |
| 437 | << " hasn't been set to any value."; |
| 438 | return false; |
| 439 | } |
| 440 | if (output) { |
| 441 | *output = value_; |
| 442 | } |
| 443 | return true; |
| 444 | } |
| 445 | |
| 446 | bool NetlinkU32Attribute::SetU32Value(uint32_t new_value) { |
| 447 | value_ = new_value; |
| 448 | has_a_value_ = true; |
| 449 | return true; |
| 450 | } |
| 451 | |
| 452 | bool NetlinkU32Attribute::ToString(string *output) const { |
| 453 | if (!output) { |
| 454 | LOG(ERROR) << "Null |output| parameter"; |
| 455 | return false; |
| 456 | } |
| 457 | uint32_t value; |
| 458 | if (!GetU32Value(&value)) |
| 459 | return false; |
| 460 | *output = StringPrintf("%" PRIu32, value); |
| 461 | return true; |
| 462 | } |
| 463 | |
| 464 | ByteString NetlinkU32Attribute::Encode() const { |
| 465 | return NetlinkAttribute::EncodeGeneric( |
| 466 | reinterpret_cast<const unsigned char *>(&value_), sizeof(value_)); |
| 467 | } |
| 468 | |
| 469 | // NetlinkU64Attribute |
| 470 | |
| 471 | const char NetlinkU64Attribute::kMyTypeString[] = "uint64_t"; |
| 472 | const NetlinkAttribute::Type NetlinkU64Attribute::kType = |
| 473 | NetlinkAttribute::kTypeU64; |
| 474 | |
| 475 | bool NetlinkU64Attribute::InitFromNlAttr(const nlattr *input) { |
| 476 | if (!input) { |
| 477 | LOG(ERROR) << "Null |input| parameter"; |
| 478 | return false; |
| 479 | } |
| 480 | |
| 481 | uint64_t data = NlaGetU64(input); |
| 482 | SetU64Value(data); |
| 483 | return NetlinkAttribute::InitFromNlAttr(input); |
| 484 | } |
| 485 | |
| 486 | bool NetlinkU64Attribute::GetU64Value(uint64_t *output) const { |
| 487 | if (!has_a_value_) { |
| 488 | SLOG(WiFi, 7) << "U64 attribute " << id_string() |
| 489 | << " hasn't been set to any value."; |
| 490 | return false; |
| 491 | } |
| 492 | if (output) { |
| 493 | *output = value_; |
| 494 | } |
| 495 | return true; |
| 496 | } |
| 497 | |
| 498 | bool NetlinkU64Attribute::SetU64Value(uint64_t new_value) { |
| 499 | value_ = new_value; |
| 500 | has_a_value_ = true; |
| 501 | return true; |
| 502 | } |
| 503 | |
| 504 | bool NetlinkU64Attribute::ToString(string *output) const { |
| 505 | if (!output) { |
| 506 | LOG(ERROR) << "Null |output| parameter"; |
| 507 | return false; |
| 508 | } |
| 509 | uint64_t value; |
| 510 | if (!GetU64Value(&value)) |
| 511 | return false; |
| 512 | *output = StringPrintf("%" PRIu64, value); |
| 513 | return true; |
| 514 | } |
| 515 | |
| 516 | ByteString NetlinkU64Attribute::Encode() const { |
| 517 | return NetlinkAttribute::EncodeGeneric( |
| 518 | reinterpret_cast<const unsigned char *>(&value_), sizeof(value_)); |
| 519 | } |
| 520 | |
| 521 | // NetlinkFlagAttribute |
| 522 | |
| 523 | const char NetlinkFlagAttribute::kMyTypeString[] = "flag"; |
| 524 | const NetlinkAttribute::Type NetlinkFlagAttribute::kType = |
| 525 | NetlinkAttribute::kTypeFlag; |
| 526 | |
| 527 | bool NetlinkFlagAttribute::InitFromNlAttr(const nlattr *input) { |
| 528 | if (!input) { |
| 529 | LOG(ERROR) << "Null |input| parameter"; |
| 530 | return false; |
| 531 | } |
| 532 | |
| 533 | // The existence of the parameter means it's true |
| 534 | SetFlagValue(true); |
| 535 | return NetlinkAttribute::InitFromNlAttr(input); |
| 536 | } |
| 537 | |
| 538 | |
| 539 | bool NetlinkFlagAttribute::GetFlagValue(bool *output) const { |
| 540 | if (output) { |
| 541 | // The lack of the existence of the attribute implies 'false'. |
| 542 | *output = (has_a_value_) ? value_ : false; |
| 543 | } |
| 544 | return true; |
| 545 | } |
| 546 | |
| 547 | bool NetlinkFlagAttribute::SetFlagValue(bool new_value) { |
| 548 | value_ = new_value; |
| 549 | has_a_value_ = true; |
| 550 | return true; |
| 551 | } |
| 552 | |
| 553 | bool NetlinkFlagAttribute::ToString(string *output) const { |
| 554 | if (!output) { |
| 555 | LOG(ERROR) << "Null |output| parameter"; |
| 556 | return false; |
| 557 | } |
| 558 | bool value; |
| 559 | if (!GetFlagValue(&value)) |
| 560 | return false; |
| 561 | *output = StringPrintf("%s", value ? "true" : "false"); |
| 562 | return true; |
| 563 | } |
| 564 | |
| 565 | ByteString NetlinkFlagAttribute::Encode() const { |
| 566 | if (has_a_value_ && value_) { |
| 567 | return NetlinkAttribute::EncodeGeneric(NULL, 0); |
| 568 | } |
| 569 | return ByteString(); // Encoding of nothing implies 'false'. |
| 570 | } |
| 571 | |
| 572 | // NetlinkStringAttribute |
| 573 | |
| 574 | const char NetlinkStringAttribute::kMyTypeString[] = "string"; |
| 575 | const NetlinkAttribute::Type NetlinkStringAttribute::kType = |
| 576 | NetlinkAttribute::kTypeString; |
| 577 | |
| 578 | bool NetlinkStringAttribute::InitFromNlAttr(const nlattr *input) { |
| 579 | if (!input) { |
| 580 | LOG(ERROR) << "Null |input| parameter"; |
| 581 | return false; |
| 582 | } |
| 583 | |
| 584 | SetStringValue(NlaGetString(input)); |
| 585 | return NetlinkAttribute::InitFromNlAttr(input); |
| 586 | } |
| 587 | |
| 588 | bool NetlinkStringAttribute::GetStringValue(string *output) const { |
| 589 | if (!has_a_value_) { |
| 590 | SLOG(WiFi, 7) << "String attribute " << id_string() |
| 591 | << " hasn't been set to any value."; |
| 592 | return false; |
| 593 | } |
| 594 | if (output) { |
| 595 | *output = value_; |
| 596 | } |
| 597 | return true; |
| 598 | } |
| 599 | |
| 600 | bool NetlinkStringAttribute::SetStringValue(const string new_value) { |
| 601 | value_ = new_value; |
| 602 | has_a_value_ = true; |
| 603 | return true; |
| 604 | } |
| 605 | |
| 606 | bool NetlinkStringAttribute::ToString(string *output) const { |
| 607 | if (!output) { |
| 608 | LOG(ERROR) << "Null |output| parameter"; |
| 609 | return false; |
| 610 | } |
| 611 | string value; |
| 612 | if (!GetStringValue(&value)) |
| 613 | return false; |
| 614 | |
| 615 | *output = StringPrintf("'%s'", value.c_str()); |
| 616 | return true; |
| 617 | } |
| 618 | |
| 619 | ByteString NetlinkStringAttribute::Encode() const { |
| 620 | return NetlinkAttribute::EncodeGeneric( |
| 621 | reinterpret_cast<const unsigned char *>(value_.c_str()), |
| 622 | value_.size() + 1); |
| 623 | } |
| 624 | |
| 625 | // NetlinkNestedAttribute |
| 626 | |
| 627 | const char NetlinkNestedAttribute::kMyTypeString[] = "nested"; |
| 628 | const NetlinkAttribute::Type NetlinkNestedAttribute::kType = |
| 629 | NetlinkAttribute::kTypeNested; |
| 630 | |
| 631 | NetlinkNestedAttribute::NetlinkNestedAttribute(int id, |
| 632 | const char *id_string) : |
| 633 | NetlinkAttribute(id, id_string, kType, kMyTypeString), |
| 634 | value_(new AttributeList) {} |
| 635 | |
| 636 | ByteString NetlinkNestedAttribute::Encode() const { |
| 637 | // Encode attribute header. |
| 638 | nlattr header; |
| 639 | header.nla_type = id(); |
| 640 | header.nla_len = nla_attr_size(sizeof(header)); |
| 641 | ByteString result(reinterpret_cast<unsigned char *>(&header), sizeof(header)); |
| 642 | result.Resize(NLA_HDRLEN); // Add padding after the header. |
| 643 | |
| 644 | // Encode all nested attributes. |
| 645 | std::map<int, AttributeList::AttributePointer>::const_iterator attribute; |
| 646 | for (attribute = value_->attributes_.begin(); |
| 647 | attribute != value_->attributes_.end(); |
| 648 | ++attribute) { |
| 649 | // Each attribute appends appropriate padding so it's not necessary to |
| 650 | // re-add padding. |
| 651 | result.Append(attribute->second->Encode()); |
| 652 | } |
| 653 | |
| 654 | // Go back and fill-in the size. |
| 655 | nlattr *new_header = reinterpret_cast<nlattr *>(result.GetData()); |
| 656 | new_header->nla_len = result.GetLength(); |
| 657 | |
| 658 | return result; |
| 659 | } |
| 660 | |
| 661 | void NetlinkNestedAttribute::Print(int log_level, int indent) const { |
| 662 | SLOG(WiFi, log_level) << HeaderToPrint(indent); |
| 663 | value_->Print(log_level, indent + 1); |
| 664 | } |
| 665 | |
| 666 | bool NetlinkNestedAttribute::ToString(std::string *output) const { |
| 667 | if (!output) { |
| 668 | LOG(ERROR) << "Null |output| parameter"; |
| 669 | return false; |
| 670 | } |
| 671 | |
| 672 | // This should never be called (attribute->ToString is only called |
| 673 | // from attribute->Print but NetlinkNestedAttribute::Print doesn't call |
| 674 | // |ToString|. Still, we should print something in case we got here |
| 675 | // accidentally. |
| 676 | LOG(WARNING) << "It is unexpected for this method to be called."; |
| 677 | output->append("<Nested Attribute>"); |
| 678 | return true; |
| 679 | } |
| 680 | |
| 681 | bool NetlinkNestedAttribute::GetNestedAttributeList( |
| 682 | AttributeListRefPtr *output) { |
| 683 | // Not checking |has_a_value| since GetNestedAttributeList is called to get |
| 684 | // a newly created AttributeList in order to have something to which to add |
| 685 | // attributes. |
| 686 | if (output) { |
| 687 | *output = value_; |
| 688 | } |
| 689 | return true; |
| 690 | } |
| 691 | |
| 692 | bool NetlinkNestedAttribute::ConstGetNestedAttributeList( |
| 693 | AttributeListConstRefPtr *output) const { |
| 694 | if (!has_a_value_) { |
| 695 | LOG(ERROR) << "Attribute does not exist."; |
| 696 | return false; |
| 697 | } |
| 698 | if (output) { |
| 699 | *output = value_; |
| 700 | } |
| 701 | return true; |
| 702 | } |
| 703 | |
| 704 | bool NetlinkNestedAttribute::SetNestedHasAValue() { |
| 705 | has_a_value_ = true; |
| 706 | return true; |
| 707 | } |
| 708 | |
| 709 | // static |
| 710 | bool NetlinkNestedAttribute::InitNestedFromNlAttr( |
| 711 | AttributeList *list, |
| 712 | const NestedData *nested_template, |
| 713 | size_t nested_template_size, |
| 714 | const nlattr *const_data) { |
| 715 | if (!nested_template) { |
| 716 | LOG(ERROR) << "Null |nested_template| parameter"; |
| 717 | return false; |
| 718 | } |
| 719 | if ((nested_template_size == 1) && (nested_template[0].is_array)) { |
| 720 | return ParseNestedArray(list, *nested_template, const_data); |
| 721 | } else { |
| 722 | return ParseNestedStructure(list, nested_template, nested_template_size, |
| 723 | const_data); |
| 724 | } |
| 725 | return true; |
| 726 | } |
| 727 | |
| 728 | // A nested array provides an arbitrary number of children, all of the same |
| 729 | // data type. Each array element may be a simple type or may be a structure. |
| 730 | // |
| 731 | // static |
| 732 | bool NetlinkNestedAttribute::ParseNestedArray( |
| 733 | AttributeList *list, |
| 734 | const NestedData &array_template, |
| 735 | const nlattr *const_data) { |
| 736 | if (!list) { |
| 737 | LOG(ERROR) << "NULL |list| parameter"; |
| 738 | return false; |
| 739 | } |
| 740 | if (!const_data) { |
| 741 | LOG(ERROR) << "Null |const_data| parameter"; |
| 742 | return false; |
| 743 | } |
| 744 | // Casting away constness since |nla_parse_nested| doesn't mark its input as |
| 745 | // const even though it doesn't modify this input parameter. |
| 746 | nlattr *attrs = const_cast<nlattr *>(const_data); |
| 747 | |
| 748 | struct nlattr *attr; |
| 749 | int remaining; |
| 750 | // The |nlattr::nla_type| value for array elements in the provided data may |
| 751 | // start on any number and are allowed to be discontiguous. In order to |
| 752 | // skirt writing an iterator, this code replaces the |nla_type| with a |
| 753 | // contiguous |id|, starting at 1 (note that, while nested structure |
| 754 | // attributes may not have an |nlattr::nla_type| valued at zero, no such |
| 755 | // restriction exists for nested array attributes -- this code starts the id |
| 756 | // at zero in order to be consistent with nested structures). |
| 757 | // |
| 758 | // TODO(wdg): Determine whether any code depends on the value of |
| 759 | // |nlattr::nla_type| for nested array attributes. |
| 760 | int id = 1; |
| 761 | nla_for_each_nested_type_corrected(attr, attrs, remaining) { |
| 762 | string attribute_name = StringPrintf("%s_%d", |
| 763 | array_template.attribute_name, id); |
| 764 | AddAttributeToNested(list, array_template.policy.type, id, attribute_name, |
| 765 | *attr, array_template); |
| 766 | ++id; |
| 767 | } |
| 768 | return true; |
| 769 | } |
| 770 | |
| 771 | // A nested structure provides a fixed set of child attributes (some of |
| 772 | // which may be optional). The caller provides the expectation of the members |
| 773 | // and values of a nested structure in the supplied 'policy' template |
| 774 | // (|struct_template|). |
| 775 | // |
| 776 | // static |
| 777 | bool NetlinkNestedAttribute::ParseNestedStructure( |
| 778 | AttributeList *list, |
| 779 | const NestedData *struct_template, |
| 780 | size_t nested_template_size, |
| 781 | const nlattr *const_data) { |
| 782 | if (!list) { |
| 783 | LOG(ERROR) << "NULL |list| parameter"; |
| 784 | return false; |
| 785 | } |
| 786 | if (!struct_template) { |
| 787 | LOG(ERROR) << "Null |struct_template| parameter"; |
| 788 | return false; |
| 789 | } |
| 790 | if (nested_template_size == 0) { |
| 791 | LOG(ERROR) << "|nested_template_size| parameter is zero"; |
| 792 | return false; |
| 793 | } |
| 794 | if (!const_data) { |
| 795 | LOG(ERROR) << "Null |const_data| parameter"; |
| 796 | return false; |
| 797 | } |
| 798 | // Casting away constness since |nla_parse_nested| doesn't mark its input as |
| 799 | // const even though it doesn't modify this input parameter. |
| 800 | nlattr *attr_data = const_cast<nlattr *>(const_data); |
| 801 | |
| 802 | // |nla_parse_nested| requires an array of |nla_policy|. While an attribute id |
| 803 | // of zero is illegal, we still need to fill that spot in the policy |
| 804 | // array so the loop will start at zero. |
| 805 | scoped_array<nla_policy> policy(new nla_policy[nested_template_size]); |
| 806 | for (size_t id = 0; id < nested_template_size ; ++id) { |
| 807 | memcpy(&policy[id], &struct_template[id].policy, sizeof(nla_policy)); |
| 808 | } |
| 809 | |
| 810 | // |nla_parse_nested| builds an array of |nlattr| from the input message. |
| 811 | scoped_array<nlattr *>attr(new nlattr *[nested_template_size]); |
| 812 | if (nla_parse_nested(attr.get(), nested_template_size-1, attr_data, |
| 813 | policy.get())) { |
| 814 | LOG(ERROR) << "nla_parse_nested failed"; |
| 815 | return false; |
| 816 | } |
| 817 | |
| 818 | // Note that the attribute id of zero is illegal so we'll start with id=1. |
| 819 | for (size_t id = 1; id < nested_template_size; ++id) { |
| 820 | // Add |attr[id]| if it exists, otherwise, it's a legally omitted optional |
| 821 | // attribute. |
| 822 | if (attr[id]) { |
| 823 | AddAttributeToNested(list, policy[id].type, id, |
| 824 | struct_template[id].attribute_name, *attr[id], |
| 825 | struct_template[id]); |
| 826 | } |
| 827 | } |
| 828 | return true; |
| 829 | } |
| 830 | |
| 831 | // static |
| 832 | void NetlinkNestedAttribute::AddAttributeToNested( |
| 833 | AttributeList *list, uint16_t type, size_t id, const string &attribute_name, |
| 834 | const nlattr &attr, const NestedData &nested_template) { |
| 835 | switch (type) { |
| 836 | case NLA_UNSPEC: |
| 837 | list->CreateRawAttribute(id, attribute_name.c_str()); |
| 838 | list->SetRawAttributeValue(id, ByteString( |
| 839 | reinterpret_cast<const char *>(nla_data(&attr)), nla_len(&attr))); |
| 840 | break; |
| 841 | case NLA_U8: |
| 842 | list->CreateU8Attribute(id, attribute_name.c_str()); |
| 843 | list->SetU8AttributeValue(id, NlaGetU8(&attr)); |
| 844 | break; |
| 845 | case NLA_U16: |
| 846 | list->CreateU16Attribute(id, attribute_name.c_str()); |
| 847 | list->SetU16AttributeValue(id, NlaGetU16(&attr)); |
| 848 | break; |
| 849 | case NLA_U32: |
| 850 | list->CreateU32Attribute(id, attribute_name.c_str()); |
| 851 | list->SetU32AttributeValue(id, NlaGetU32(&attr)); |
| 852 | break; |
| 853 | case NLA_U64: |
| 854 | list->CreateU64Attribute(id, attribute_name.c_str()); |
| 855 | list->SetU64AttributeValue(id, NlaGetU64(&attr)); |
| 856 | break; |
| 857 | case NLA_FLAG: |
| 858 | list->CreateFlagAttribute(id, attribute_name.c_str()); |
| 859 | list->SetFlagAttributeValue(id, true); |
| 860 | break; |
| 861 | case NLA_STRING: |
| 862 | // Note that nested structure attributes are validated by |validate_nla| |
| 863 | // which requires a string attribute to have at least 1 character |
| 864 | // (presumably for the '\0') while the kernel can create an empty string |
| 865 | // for at least one nested string array attribute type |
| 866 | // (NL80211_ATTR_SCAN_SSIDS -- the emptyness of the string is exhibited |
| 867 | // by the value of |nlattr::nla_len|). This code handles both cases. |
| 868 | list->CreateStringAttribute(id, attribute_name.c_str()); |
| 869 | if (nla_len(&attr) <= 0) { |
| 870 | list->SetStringAttributeValue(id, ""); |
| 871 | } else { |
| 872 | list->SetStringAttributeValue(id, NlaGetString(&attr)); |
| 873 | } |
| 874 | break; |
| 875 | case NLA_NESTED: |
| 876 | { |
| 877 | if (!nested_template.deeper_nesting) { |
| 878 | LOG(ERROR) << "No rules for nesting " << attribute_name |
| 879 | << ". Ignoring."; |
| 880 | break; |
| 881 | } |
| 882 | list->CreateNestedAttribute(id, attribute_name.c_str()); |
| 883 | |
| 884 | // Now, handle the nested data. |
| 885 | AttributeListRefPtr nested_attribute; |
| 886 | if (!list->GetNestedAttributeList(id, &nested_attribute) || |
| 887 | !nested_attribute) { |
| 888 | LOG(FATAL) << "Couldn't get attribute " << attribute_name |
| 889 | << " which we just created."; |
| 890 | break; |
| 891 | } |
| 892 | |
| 893 | if (!InitNestedFromNlAttr(nested_attribute.get(), |
| 894 | nested_template.deeper_nesting, |
| 895 | nested_template.deeper_nesting_size, |
| 896 | &attr)) { |
| 897 | LOG(ERROR) << "Couldn't parse attribute " << attribute_name; |
| 898 | break; |
| 899 | } |
| 900 | list->SetNestedAttributeHasAValue(id); |
| 901 | } |
| 902 | break; |
| 903 | default: |
| 904 | LOG(ERROR) << "Discarding " << attribute_name |
| 905 | << ". Attribute has unhandled type " << type << "."; |
| 906 | break; |
| 907 | } |
| 908 | } |
| 909 | |
| 910 | // NetlinkRawAttribute |
| 911 | |
| 912 | const char NetlinkRawAttribute::kMyTypeString[] = "<raw>"; |
| 913 | const NetlinkAttribute::Type NetlinkRawAttribute::kType = |
| 914 | NetlinkAttribute::kTypeRaw; |
| 915 | |
| 916 | bool NetlinkRawAttribute::InitFromNlAttr(const nlattr *input) { |
| 917 | if (!input) { |
| 918 | LOG(ERROR) << "Null |input| parameter"; |
| 919 | return false; |
| 920 | } |
| 921 | |
| 922 | if (!NetlinkAttribute::InitFromNlAttr(input)) { |
| 923 | return false; |
| 924 | } |
| 925 | has_a_value_ = true; |
| 926 | return true; |
| 927 | } |
| 928 | |
| 929 | bool NetlinkRawAttribute::GetRawValue(ByteString *output) const { |
| 930 | if (!has_a_value_) { |
| 931 | SLOG(WiFi, 7) << "Raw attribute " << id_string() |
| 932 | << " hasn't been set to any value."; |
| 933 | return false; |
| 934 | } |
| 935 | if (output) { |
| 936 | *output = data_; |
| 937 | } |
| 938 | return true; |
| 939 | } |
| 940 | |
| 941 | bool NetlinkRawAttribute::SetRawValue(const ByteString new_value) { |
| 942 | data_ = new_value; |
| 943 | has_a_value_ = true; |
| 944 | return true; |
| 945 | } |
| 946 | |
| 947 | bool NetlinkRawAttribute::ToString(string *output) const { |
| 948 | if (!output) { |
| 949 | LOG(ERROR) << "Null |output| parameter"; |
| 950 | return false; |
| 951 | } |
| 952 | if (!has_a_value_) { |
| 953 | SLOG(WiFi, 7) << "Raw attribute " << id_string() |
| 954 | << " hasn't been set to any value."; |
| 955 | return false; |
| 956 | } |
| 957 | int total_bytes = data_.GetLength(); |
| 958 | const uint8_t *const_data = data_.GetConstData(); |
| 959 | |
| 960 | *output = StringPrintf("%d bytes:", total_bytes); |
| 961 | for (int i = 0; i < total_bytes; ++i) { |
| 962 | StringAppendF(output, " 0x%02x", const_data[i]); |
| 963 | } |
| 964 | return true; |
| 965 | } |
| 966 | |
| 967 | ByteString NetlinkRawAttribute::Encode() const { |
| 968 | return NetlinkAttribute::EncodeGeneric(data_.GetConstData(), |
| 969 | data_.GetLength()); |
| 970 | } |
| 971 | |
| 972 | NetlinkAttributeGeneric::NetlinkAttributeGeneric(int id) |
| 973 | : NetlinkRawAttribute(id, "unused-string") { |
| 974 | StringAppendF(&id_string_, "<UNKNOWN ATTRIBUTE %d>", id); |
| 975 | } |
| 976 | |
| 977 | const char *NetlinkAttributeGeneric::id_string() const { |
| 978 | return id_string_.c_str(); |
| 979 | } |
| 980 | |
| 981 | } // namespace shill |