Revert 37009 - Adding geolocation data provider infrastructure to Chrome....

chrome/browser/geolocation/wifi_data_provider_linux.cc

Index: chrome/browser/geolocation/wifi_data_provider_linux.cc
===================================================================
--- chrome/browser/geolocation/wifi_data_provider_linux.cc	(revision 37014)
+++ chrome/browser/geolocation/wifi_data_provider_linux.cc	(working copy)
@@ -1,279 +0,0 @@
-// Copyright 2008, Google Inc.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-//
-//  1. Redistributions of source code must retain the above copyright notice,
-//     this list of conditions and the following disclaimer.
-//  2. Redistributions in binary form must reproduce the above copyright notice,
-//     this list of conditions and the following disclaimer in the documentation
-//     and/or other materials provided with the distribution.
-//  3. Neither the name of Google Inc. nor the names of its contributors may be
-//     used to endorse or promote products derived from this software without
-//     specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
-// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
-// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
-// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
-// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
-// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-//
-// WiFi card drivers for Linux implement the Wireless Extensions interface.
-// This interface is part of the Linux kernel.
-//
-// Various sets of tools are available to manipulate the Wireless Extensions,
-// of which Wireless Tools is the default implementation. Wireless Tools
-// provides a C++ library (libiw) as well as a set of command line tools
-// (iwconfig, iwlist etc). See
-// http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/Tools.html for details.
-//
-// Ideally, we would use libiw to obtain WiFi data. However, Wireless Tools is
-// released under GPL, which is not compatible with Gears. Furthermore, little
-// documentation is available for Wireless Extensions, so replicating libiw
-// without copying it directly would be difficult.
-//
-// We therefore simply invoke iwlist (one of the Wireless Tools command line
-// tools) and parse the output. Sample output is shown below.
-//
-// lo        Interface doesn't support scanning.
-//
-// ath0      Scan completed :
-//           Cell 01 - Address: 00:24:86:11:4C:42
-//                     ESSID:"Test SSID"
-//                     Mode:Master
-//                     Frequency:2.427 GHz (Channel 4)
-//                     Quality=5/94  Signal level=-90 dBm  Noise level=-95 dBm
-//                     Encryption key:off
-//                     Bit Rates:1 Mb/s; 2 Mb/s; 5 Mb/s; 6 Mb/s; 9 Mb/s
-//                               11 Mb/s; 12 Mb/s; 18 Mb/s
-//                     Extra:bcn_int=100
-//           Cell 02 - Address: 00:24:86:11:6F:E2
-//                     ESSID:"Test SSID"
-//                     Mode:Master
-//                     Frequency:2.447 GHz (Channel 8)
-//                     Quality=4/94  Signal level=-91 dBm  Noise level=-95 dBm
-//                     Encryption key:off
-//                     Bit Rates:1 Mb/s; 2 Mb/s; 5 Mb/s; 6 Mb/s; 9 Mb/s
-//                               11 Mb/s; 12 Mb/s; 18 Mb/s
-//                     Extra:bcn_int=100
-//
-// TODO(steveblock): Investigate the possibility of the author of Wireless Tools
-// releasing libiw under a Gears-compatible license.
-
-// TODO(cprince): remove platform-specific #ifdef guards when OS-specific
-// sources (e.g. WIN32_CPPSRCS) are implemented
-#if defined(LINUX) && !defined(OS_MACOSX)
-
-#include "gears/geolocation/wifi_data_provider_linux.h"
-
-#include <ctype.h>  // For isxdigit()
-#include <stdio.h>
-#include "gears/base/common/string_utils.h"
-#include "gears/geolocation/wifi_data_provider_common.h"
-
-// The time periods, in milliseconds, between successive polls of the wifi data.
-extern const int kDefaultPollingInterval = 10000;  // 10s
-extern const int kNoChangePollingInterval = 120000;  // 2 mins
-extern const int kTwoNoChangePollingInterval = 600000;  // 10 mins
-
-// Local function
-static bool GetAccessPointData(WifiData::AccessPointDataSet *access_points);
-
-// static
-template<>
-WifiDataProviderImplBase *WifiDataProvider::DefaultFactoryFunction() {
-  return new LinuxWifiDataProvider();
-}
-
-
-LinuxWifiDataProvider::LinuxWifiDataProvider()
-    : is_first_scan_complete_(false) {
-  Start();
-}
-
-LinuxWifiDataProvider::~LinuxWifiDataProvider() {
-  stop_event_.Signal();
-  Join();
-}
-
-bool LinuxWifiDataProvider::GetData(WifiData *data) {
-  assert(data);
-  MutexLock lock(&data_mutex_);
-  *data = wifi_data_;
-  // If we've successfully completed a scan, indicate that we have all of the
-  // data we can get.
-  return is_first_scan_complete_;
-}
-
-// Thread implementation
-void LinuxWifiDataProvider::Run() {
-  // Regularly get the access point data.
-  int polling_interval = kDefaultPollingInterval;
-  do {
-    WifiData new_data;
-    if (GetAccessPointData(&new_data.access_point_data)) {
-      bool update_available;
-      data_mutex_.Lock();
-      update_available = wifi_data_.DiffersSignificantly(new_data);
-      wifi_data_ = new_data;
-      data_mutex_.Unlock();
-      polling_interval =
-          UpdatePollingInterval(polling_interval, update_available);
-      if (update_available) {
-        is_first_scan_complete_ = true;
-        NotifyListeners();
-      }
-    }
-  } while (!stop_event_.WaitWithTimeout(polling_interval));
-}
-
-// Local functions
-
-static bool IsValidMacAddress(const char *mac_address) {
-  return isxdigit(mac_address[0]) &&
-         isxdigit(mac_address[1]) &&
-         mac_address[2] == ':' &&
-         isxdigit(mac_address[3]) &&
-         isxdigit(mac_address[4]) &&
-         mac_address[5] == ':' &&
-         isxdigit(mac_address[6]) &&
-         isxdigit(mac_address[7]) &&
-         mac_address[8] == ':' &&
-         isxdigit(mac_address[9]) &&
-         isxdigit(mac_address[10]) &&
-         mac_address[11] == ':' &&
-         isxdigit(mac_address[12]) &&
-         isxdigit(mac_address[13]) &&
-         mac_address[14] == ':' &&
-         isxdigit(mac_address[15]) &&
-         isxdigit(mac_address[16]);
-}
-
-static void ParseLine(const std::string &line,
-                      const std::string &mac_address_string,
-                      const std::string &ssid_string,
-                      const std::string &signal_strength_string,
-                      AccessPointData *access_point_data) {
-  // Currently we get only MAC address, SSID and signal strength.
-  // TODO(steveblock): Work out how to get age, channel and signal-to-noise.
-  std::string::size_type index;
-  if ((index = line.find(mac_address_string)) != std::string::npos) {
-    // MAC address
-    if (IsValidMacAddress(&line.at(index + mac_address_string.size()))) {
-      UTF8ToString16(&line.at(index + mac_address_string.size()),
-                     17,  // XX:XX:XX:XX:XX:XX
-                     &access_point_data->mac_address);
-    }
-  } else if ((index = line.find(ssid_string)) != std::string::npos) {
-    // SSID
-    // The string should be quoted.
-    std::string::size_type start = index + ssid_string.size() + 1;
-    std::string::size_type end = line.find('\"', start);
-    // If we can't find a trailing quote, something has gone wrong.
-    if (end != std::string::npos) {
-      UTF8ToString16(&line.at(start), end - start, &access_point_data->ssid);
-    }
-  } else if ((index = line.find(signal_strength_string)) != std::string::npos) {
-    // Signal strength
-    // iwlist will convert to dBm if it can. If it has failed to do so, we can't
-    // make use of the data.
-    if (line.find("dBm") != std::string::npos) {
-      // atoi will ignore trailing non-numeric characters
-      access_point_data->radio_signal_strength =
-          atoi(&line.at(index + signal_strength_string.size()));
-    }
-  }
-}
-
-static void ParseAccessPoint(const std::string &text,
-                             const std::string &mac_address_string,
-                             const std::string &ssid_string,
-                             const std::string &signal_strength_string,
-                             AccessPointData *access_point_data) {
-  // Split response into lines to aid parsing.
-  std::string::size_type start = 0;
-  std::string::size_type end;
-  do {
-    end = text.find('\n', start);
-    std::string::size_type length = (end == std::string::npos) ?
-                                    std::string::npos : end - start;
-    ParseLine(text.substr(start, length),
-              mac_address_string,
-              ssid_string,
-              signal_strength_string,
-              access_point_data);
-    start = end + 1;
-  } while (end != std::string::npos);
-}
-
-// Issues the specified command, and parses the response. Data for each access
-// point is separated by the given delimiter. Within each block of data, the
-// repsonse is split into lines and data is extracted by searching for the MAC
-// address, SSID and signal strength strings.
-bool IssueCommandAndParseResult(const char *command,
-                                const char *delimiter,
-                                const std::string &mac_address_string,
-                                const std::string &ssid_string,
-                                const std::string &signal_strength_string,
-                                WifiData::AccessPointDataSet *access_points) {
-  // Open pipe in read mode.
-  FILE *result_pipe = popen(command, "r");
-  if (result_pipe == NULL) {
-    LOG(("IssueCommand(): Failed to open pipe.\n"));
-    return false;
-  }
-
-  // Read results of command.
-  static const int kBufferSize = 1024;
-  char buffer[kBufferSize];
-  size_t bytes_read;
-  std::string result;
-  do {
-    bytes_read = fread(buffer, 1, kBufferSize, result_pipe);
-    result.append(buffer, bytes_read);
-  } while (static_cast<int>(bytes_read) == kBufferSize);
-  pclose(result_pipe);
-
-
-  // Parse results.
-  assert(access_points);
-  access_points->clear();
-  std::string::size_type start = result.find(delimiter);
-  while (start != std::string::npos) {
-    std::string::size_type end = result.find(delimiter, start + 1);
-    std::string::size_type length = (end == std::string::npos) ?
-                                    std::string::npos : end - start;
-    AccessPointData access_point_data;
-    ParseAccessPoint(result.substr(start, length),
-                     mac_address_string,
-                     ssid_string,
-                     signal_strength_string,
-                     &access_point_data);
-    access_points->insert(access_point_data);
-    start = end;
-  }
-
-  return !access_points->empty();
-}
-
-static bool GetAccessPointData(WifiData::AccessPointDataSet *access_points) {
-  return IssueCommandAndParseResult("iwlist scan 2> /dev/null",
-                                    "Cell ",
-                                    "Address: ",
-                                    "ESSID:",
-                                    "Signal level=",
-                                    access_points) ||
-         IssueCommandAndParseResult("iwconfig 2> /dev/null",
-                                    "ESSID:\"",
-                                    "Access Point: ",
-                                    "ESSID:",
-                                    "Signal level=",
-                                    access_points);
-}
-
-#endif  // LINUX && !OS_MACOSX