Maxim Integrated / Mbed 2 deprecated DeepCover Embedded Security in IoT

MAXREFDES143#: DeepCover Embedded Security in IoT Authenticated Sensing & Notification

Dependencies:   MaximInterface mbed

The MAXREFDES143# is an Internet of Things (IoT) embedded security reference design, built to protect an industrial sensing node by means of authentication and notification to a web server. The hardware includes a peripheral module representing a protected sensor node monitoring operating temperature and remaining life of a filter (simulated through ambient light sensing) and an mbed shield representing a controller node responsible for monitoring one or more sensor nodes. The design is hierarchical with each controller node communicating data from connected sensor nodes to a web server that maintains a centralized log and dispatches notifications as necessary. The mbed shield contains a Wi-Fi module, a DS2465 coprocessor with 1-Wire® master function, an LCD, LEDs, and pushbuttons. The protected sensor node contains a DS28E15 authenticator, a DS7505 temperature sensor, and a MAX44009 light sensor. The mbed shield communicates to a web server by the onboard Wi-Fi module and to the protected sensor node with I2C and 1-Wire. The MAXREFDES143# is equipped with a standard shield connector for immediate testing using an mbed board such as the MAX32600MBED#. The simplicity of this design enables rapid integration into any star-topology IoT network requiring the heightened security with low overhead provided by the SHA-256 symmetric-key algorithm.

More information about the MAXREFDES143# is available on the Maxim Integrated website.

WebServerInterface.cpp@28:e5cdaf13d299, 2017-01-26 (annotated)

Committer:
IanBenzMaxim
Date:
Thu Jan 26 14:18:21 2017 -0600
Revision:
28:e5cdaf13d299
Parent:
27:81a87d29bedd
Child:
29:590a7561318b
Migrated the web interface to the mbed 5 networking stack to improve system compatibility.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
IanBenzMaxim 1:e1c7c1c636af 1 /*******************************************************************************
IanBenzMaxim 1:e1c7c1c636af 2 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
IanBenzMaxim 1:e1c7c1c636af 3 *
IanBenzMaxim 1:e1c7c1c636af 4 * Permission is hereby granted, free of charge, to any person obtaining a
IanBenzMaxim 1:e1c7c1c636af 5 * copy of this software and associated documentation files (the "Software"),
IanBenzMaxim 1:e1c7c1c636af 6 * to deal in the Software without restriction, including without limitation
IanBenzMaxim 1:e1c7c1c636af 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
IanBenzMaxim 1:e1c7c1c636af 8 * and/or sell copies of the Software, and to permit persons to whom the
IanBenzMaxim 1:e1c7c1c636af 9 * Software is furnished to do so, subject to the following conditions:
IanBenzMaxim 1:e1c7c1c636af 10 *
IanBenzMaxim 1:e1c7c1c636af 11 * The above copyright notice and this permission notice shall be included
IanBenzMaxim 1:e1c7c1c636af 12 * in all copies or substantial portions of the Software.
IanBenzMaxim 1:e1c7c1c636af 13 *
IanBenzMaxim 1:e1c7c1c636af 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
IanBenzMaxim 1:e1c7c1c636af 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
IanBenzMaxim 1:e1c7c1c636af 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IanBenzMaxim 1:e1c7c1c636af 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
IanBenzMaxim 1:e1c7c1c636af 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
IanBenzMaxim 1:e1c7c1c636af 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
IanBenzMaxim 1:e1c7c1c636af 20 * OTHER DEALINGS IN THE SOFTWARE.
IanBenzMaxim 1:e1c7c1c636af 21 *
IanBenzMaxim 1:e1c7c1c636af 22 * Except as contained in this notice, the name of Maxim Integrated
IanBenzMaxim 1:e1c7c1c636af 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
IanBenzMaxim 1:e1c7c1c636af 24 * Products, Inc. Branding Policy.
IanBenzMaxim 1:e1c7c1c636af 25 *
IanBenzMaxim 1:e1c7c1c636af 26 * The mere transfer of this software does not imply any licenses
IanBenzMaxim 1:e1c7c1c636af 27 * of trade secrets, proprietary technology, copyrights, patents,
IanBenzMaxim 1:e1c7c1c636af 28 * trademarks, maskwork rights, or any other form of intellectual
IanBenzMaxim 1:e1c7c1c636af 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
IanBenzMaxim 1:e1c7c1c636af 30 * ownership rights.
IanBenzMaxim 1:e1c7c1c636af 31 *******************************************************************************
IanBenzMaxim 1:e1c7c1c636af 32 */
IanBenzMaxim 1:e1c7c1c636af 33
IanBenzMaxim 28:e5cdaf13d299 34 #include <sstream>
IanBenzMaxim 1:e1c7c1c636af 35 #include <vector>
IanBenzMaxim 1:e1c7c1c636af 36 #include "WebServerInterface.hpp"
IanBenzMaxim 28:e5cdaf13d299 37 #include "NetworkStack.h"
IanBenzMaxim 28:e5cdaf13d299 38 #include "TCPSocket.h"
IanBenzMaxim 16:6bce01c1dd90 39 #include "Slaves/Authenticators/ISha256MacCoproc.h"
IanBenzMaxim 25:37ea43ff81be 40 #include "SensorData.hpp"
IanBenzMaxim 25:37ea43ff81be 41 #include "HexConversions.hpp"
IanBenzMaxim 6:b6bafd0a7013 42 #include "Serial.h"
IanBenzMaxim 6:b6bafd0a7013 43 #include "wait_api.h"
IanBenzMaxim 6:b6bafd0a7013 44
IanBenzMaxim 8:594529956266 45 using OneWire::ISha256MacCoproc;
IanBenzMaxim 1:e1c7c1c636af 46
IanBenzMaxim 12:5f8727ba1493 47 const char WebServerInterface::serverAddress[] = "www.mxim-security.us";
IanBenzMaxim 3:ac723be395d9 48 const unsigned int WebServerInterface::serverPort = 80;
IanBenzMaxim 1:e1c7c1c636af 49 const char WebServerInterface::serverPostPath[] = "/post.php";
IanBenzMaxim 1:e1c7c1c636af 50 const char WebServerInterface::serverChallengePath[] = "/challenge.php";
IanBenzMaxim 1:e1c7c1c636af 51
IanBenzMaxim 1:e1c7c1c636af 52 // HTTP formatting constants
IanBenzMaxim 1:e1c7c1c636af 53 static const char keyValSeparator = '=';
IanBenzMaxim 1:e1c7c1c636af 54 static const char fieldSeparator = '&';
IanBenzMaxim 1:e1c7c1c636af 55 static const std::string newline = "\r\n";
IanBenzMaxim 1:e1c7c1c636af 56 static const char sessionIdKey[] = "SessionId";
IanBenzMaxim 1:e1c7c1c636af 57
IanBenzMaxim 1:e1c7c1c636af 58 // Authentication MAC constants
IanBenzMaxim 6:b6bafd0a7013 59 static const size_t challengeLen = 32;
IanBenzMaxim 6:b6bafd0a7013 60 static const uint8_t defaultPaddingByte = 0x00;
IanBenzMaxim 1:e1c7c1c636af 61
IanBenzMaxim 1:e1c7c1c636af 62 /// Select the Transport Secret for the web server in the Controller.
IanBenzMaxim 1:e1c7c1c636af 63 /// @returns True on success.
IanBenzMaxim 25:37ea43ff81be 64 static bool setHttpPostSecret(ISha256MacCoproc & MacCoproc, const OneWire::RomId & sessionId)
IanBenzMaxim 1:e1c7c1c636af 65 {
IanBenzMaxim 25:37ea43ff81be 66 ISha256MacCoproc::DevicePage fillData;
IanBenzMaxim 25:37ea43ff81be 67 fillData.fill(defaultPaddingByte);
IanBenzMaxim 25:37ea43ff81be 68 ISha256MacCoproc::SlaveSecretData secretData;
IanBenzMaxim 25:37ea43ff81be 69 secretData.fill(defaultPaddingByte);
IanBenzMaxim 25:37ea43ff81be 70 std::copy(sessionId.buffer.begin(), sessionId.buffer.end(), secretData.begin());
IanBenzMaxim 25:37ea43ff81be 71 return (MacCoproc.computeSlaveSecret(fillData, fillData, secretData) == ISha256MacCoproc::Success);
IanBenzMaxim 1:e1c7c1c636af 72 }
IanBenzMaxim 1:e1c7c1c636af 73
IanBenzMaxim 1:e1c7c1c636af 74 /// Format an HTTP GET request as a string for transmission.
IanBenzMaxim 1:e1c7c1c636af 75 /// @param host Web server address.
IanBenzMaxim 1:e1c7c1c636af 76 /// @param path Web server location to retrieve.
IanBenzMaxim 1:e1c7c1c636af 77 /// @param sessionId Session ID used to identify this controller.
IanBenzMaxim 1:e1c7c1c636af 78 /// @returns GET request string.
IanBenzMaxim 1:e1c7c1c636af 79 static std::string formatHttpGet(const std::string & host, const std::string & path, const std::string & sessionId)
IanBenzMaxim 1:e1c7c1c636af 80 {
IanBenzMaxim 1:e1c7c1c636af 81 std::ostringstream httpGetStream;
IanBenzMaxim 1:e1c7c1c636af 82 httpGetStream << "GET " << path;
IanBenzMaxim 1:e1c7c1c636af 83 if (sessionId.length() > 0)
IanBenzMaxim 1:e1c7c1c636af 84 httpGetStream << '?' << sessionIdKey << keyValSeparator << sessionId;
IanBenzMaxim 1:e1c7c1c636af 85 httpGetStream << " HTTP/1.1" << newline;
IanBenzMaxim 1:e1c7c1c636af 86 httpGetStream << "Host: " << host << newline;
IanBenzMaxim 1:e1c7c1c636af 87 httpGetStream << newline;
IanBenzMaxim 1:e1c7c1c636af 88 return httpGetStream.str();
IanBenzMaxim 1:e1c7c1c636af 89 }
IanBenzMaxim 1:e1c7c1c636af 90
IanBenzMaxim 1:e1c7c1c636af 91 /// Computes a MAC using the Transport Secret to sign HTTP POST requests.
IanBenzMaxim 1:e1c7c1c636af 92 /// @param macCoproc Coprocessor such as the DS2465 used to calculate the authentication MAC.
IanBenzMaxim 1:e1c7c1c636af 93 /// @param input Message array used for MAC calculation.
IanBenzMaxim 1:e1c7c1c636af 94 /// @param ilen Length of array input.
IanBenzMaxim 1:e1c7c1c636af 95 /// @param output Calculated MAC output.
IanBenzMaxim 6:b6bafd0a7013 96 static void calculateHttpPostMac(const ISha256MacCoproc & macCoproc, const uint8_t * input, size_t ilen, ISha256MacCoproc::Mac & output)
IanBenzMaxim 1:e1c7c1c636af 97 {
IanBenzMaxim 6:b6bafd0a7013 98 ISha256MacCoproc::DeviceScratchpad block;
IanBenzMaxim 6:b6bafd0a7013 99 size_t index = 0;
IanBenzMaxim 6:b6bafd0a7013 100 ISha256MacCoproc::AuthMacData padding;
IanBenzMaxim 25:37ea43ff81be 101 padding.fill(defaultPaddingByte);
IanBenzMaxim 25:37ea43ff81be 102 output.fill(defaultPaddingByte); // Set initial hash value
IanBenzMaxim 1:e1c7c1c636af 103 while (index < ilen)
IanBenzMaxim 1:e1c7c1c636af 104 {
IanBenzMaxim 25:37ea43ff81be 105 if ((index + block.size()) <= ilen) // Full block
IanBenzMaxim 1:e1c7c1c636af 106 {
IanBenzMaxim 25:37ea43ff81be 107 std::memcpy(block.data(), &input[index], block.size());
IanBenzMaxim 25:37ea43ff81be 108 index += block.size();
IanBenzMaxim 1:e1c7c1c636af 109 }
IanBenzMaxim 1:e1c7c1c636af 110 else // Partial block with padding
IanBenzMaxim 1:e1c7c1c636af 111 {
IanBenzMaxim 25:37ea43ff81be 112 std::memcpy(block.data(), &input[index], ilen - index);
IanBenzMaxim 25:37ea43ff81be 113 std::memset(&block[ilen - index], defaultPaddingByte, block.size() - (ilen - index));
IanBenzMaxim 1:e1c7c1c636af 114 index = ilen;
IanBenzMaxim 1:e1c7c1c636af 115 }
IanBenzMaxim 1:e1c7c1c636af 116 // Write data to coprocessor and hash block
IanBenzMaxim 1:e1c7c1c636af 117 macCoproc.computeAuthMac(output, block, padding, output);
IanBenzMaxim 1:e1c7c1c636af 118 }
IanBenzMaxim 1:e1c7c1c636af 119 }
IanBenzMaxim 1:e1c7c1c636af 120
IanBenzMaxim 1:e1c7c1c636af 121 /// Format an HTTP POST request as a string for transmission.
IanBenzMaxim 1:e1c7c1c636af 122 /// @param host Web server address.
IanBenzMaxim 1:e1c7c1c636af 123 /// @param path Web server location to receive POST.
IanBenzMaxim 1:e1c7c1c636af 124 /// @param sessionId Session ID used to identify this Controller.
IanBenzMaxim 1:e1c7c1c636af 125 /// @param macCoproc Coprocessor such as the DS2465 used to calculate the authentication MAC.
IanBenzMaxim 1:e1c7c1c636af 126 /// @param event Event message type.
IanBenzMaxim 1:e1c7c1c636af 127 /// @param initialPostBody Message body as determined by the event message type.
IanBenzMaxim 1:e1c7c1c636af 128 /// @param challenge Challenge previously received from web server for use in authentication MAC.
IanBenzMaxim 1:e1c7c1c636af 129 /// @returns POST request string.
IanBenzMaxim 1:e1c7c1c636af 130 static std::string formatHttpPost(const std::string & host, const std::string & path, const std::string & sessionId,
IanBenzMaxim 6:b6bafd0a7013 131 const ISha256MacCoproc & macCoproc, PostEvent event, const std::string & initialPostBody,
IanBenzMaxim 6:b6bafd0a7013 132 const uint8_t (&challenge)[challengeLen])
IanBenzMaxim 1:e1c7c1c636af 133 {
IanBenzMaxim 6:b6bafd0a7013 134 const size_t headerReserve = 115, bodyReserve = 200;
IanBenzMaxim 1:e1c7c1c636af 135
IanBenzMaxim 1:e1c7c1c636af 136 std::string httpPost;
IanBenzMaxim 1:e1c7c1c636af 137 httpPost.reserve(initialPostBody.length() + headerReserve + bodyReserve);
IanBenzMaxim 1:e1c7c1c636af 138
IanBenzMaxim 1:e1c7c1c636af 139 // Add session ID to post body
IanBenzMaxim 1:e1c7c1c636af 140 if (sessionId.length() > 0)
IanBenzMaxim 1:e1c7c1c636af 141 {
IanBenzMaxim 1:e1c7c1c636af 142 httpPost += sessionIdKey;
IanBenzMaxim 1:e1c7c1c636af 143 httpPost += keyValSeparator;
IanBenzMaxim 1:e1c7c1c636af 144 httpPost += sessionId;
IanBenzMaxim 1:e1c7c1c636af 145 }
IanBenzMaxim 1:e1c7c1c636af 146
IanBenzMaxim 1:e1c7c1c636af 147 // Add event to post body
IanBenzMaxim 1:e1c7c1c636af 148 std::string eventString;
IanBenzMaxim 1:e1c7c1c636af 149 switch (event)
IanBenzMaxim 1:e1c7c1c636af 150 {
IanBenzMaxim 1:e1c7c1c636af 151 case SensorDataEvent:
IanBenzMaxim 1:e1c7c1c636af 152 eventString = "SensorData";
IanBenzMaxim 1:e1c7c1c636af 153 break;
IanBenzMaxim 1:e1c7c1c636af 154
IanBenzMaxim 1:e1c7c1c636af 155 case InvalidSensorEvent:
IanBenzMaxim 1:e1c7c1c636af 156 eventString = "InvalidSensor";
IanBenzMaxim 1:e1c7c1c636af 157 break;
IanBenzMaxim 1:e1c7c1c636af 158 }
IanBenzMaxim 1:e1c7c1c636af 159 if (eventString.length() > 0)
IanBenzMaxim 1:e1c7c1c636af 160 {
IanBenzMaxim 1:e1c7c1c636af 161 if (httpPost.length() > 0)
IanBenzMaxim 1:e1c7c1c636af 162 httpPost += fieldSeparator;
IanBenzMaxim 1:e1c7c1c636af 163 httpPost += "Event";
IanBenzMaxim 1:e1c7c1c636af 164 httpPost += keyValSeparator;
IanBenzMaxim 1:e1c7c1c636af 165 httpPost += eventString;
IanBenzMaxim 1:e1c7c1c636af 166 }
IanBenzMaxim 1:e1c7c1c636af 167
IanBenzMaxim 1:e1c7c1c636af 168 // Add initial post body
IanBenzMaxim 1:e1c7c1c636af 169 if (initialPostBody.length() > 0)
IanBenzMaxim 1:e1c7c1c636af 170 {
IanBenzMaxim 1:e1c7c1c636af 171 if (httpPost.length() > 0)
IanBenzMaxim 1:e1c7c1c636af 172 httpPost += fieldSeparator;
IanBenzMaxim 1:e1c7c1c636af 173 httpPost += initialPostBody;
IanBenzMaxim 1:e1c7c1c636af 174 }
IanBenzMaxim 1:e1c7c1c636af 175
IanBenzMaxim 1:e1c7c1c636af 176 // Combine initial post body with initial secret and hash
IanBenzMaxim 6:b6bafd0a7013 177 std::vector<uint8_t> hashInput;
IanBenzMaxim 1:e1c7c1c636af 178 hashInput.reserve(challengeLen + httpPost.length());
IanBenzMaxim 25:37ea43ff81be 179 hashInput.assign(challenge, challenge + challengeLen);
IanBenzMaxim 1:e1c7c1c636af 180 hashInput.insert(hashInput.end(), httpPost.begin(), httpPost.end());
IanBenzMaxim 6:b6bafd0a7013 181 ISha256MacCoproc::Mac mac;
IanBenzMaxim 1:e1c7c1c636af 182 calculateHttpPostMac(macCoproc, &hashInput[0], hashInput.size(), mac);
IanBenzMaxim 1:e1c7c1c636af 183
IanBenzMaxim 1:e1c7c1c636af 184 char contentLen[5];
IanBenzMaxim 25:37ea43ff81be 185 snprintf(contentLen, sizeof(contentLen) / sizeof(contentLen[0]), "%u", (hashInput.size() - challengeLen) + (mac.size() * charsPerByte) + 5 /* &MAC= */);
IanBenzMaxim 1:e1c7c1c636af 186
IanBenzMaxim 1:e1c7c1c636af 187 // Construct full post request
IanBenzMaxim 1:e1c7c1c636af 188 httpPost = "";
IanBenzMaxim 1:e1c7c1c636af 189 httpPost += "POST ";
IanBenzMaxim 1:e1c7c1c636af 190 httpPost += path;
IanBenzMaxim 1:e1c7c1c636af 191 httpPost += " HTTP/1.1";
IanBenzMaxim 1:e1c7c1c636af 192 httpPost += newline;
IanBenzMaxim 1:e1c7c1c636af 193 httpPost += "Host: ";
IanBenzMaxim 1:e1c7c1c636af 194 httpPost += host;
IanBenzMaxim 1:e1c7c1c636af 195 httpPost += newline;
IanBenzMaxim 1:e1c7c1c636af 196 httpPost += "Accept: */*";
IanBenzMaxim 1:e1c7c1c636af 197 httpPost += newline;
IanBenzMaxim 1:e1c7c1c636af 198 httpPost += "Content-Length: ";
IanBenzMaxim 1:e1c7c1c636af 199 httpPost += contentLen;
IanBenzMaxim 1:e1c7c1c636af 200 httpPost += newline;
IanBenzMaxim 1:e1c7c1c636af 201 httpPost += "Content-Type: application/x-www-form-urlencoded";
IanBenzMaxim 1:e1c7c1c636af 202 httpPost += newline;
IanBenzMaxim 1:e1c7c1c636af 203 httpPost += newline;
IanBenzMaxim 1:e1c7c1c636af 204 // Add post body
IanBenzMaxim 1:e1c7c1c636af 205 httpPost.append(reinterpret_cast<char *>(&hashInput[challengeLen]), hashInput.size() - challengeLen);
IanBenzMaxim 1:e1c7c1c636af 206 // Convert hash to hex string and add to post body
IanBenzMaxim 1:e1c7c1c636af 207 httpPost += fieldSeparator;
IanBenzMaxim 1:e1c7c1c636af 208 httpPost += "MAC";
IanBenzMaxim 1:e1c7c1c636af 209 httpPost += keyValSeparator;
IanBenzMaxim 25:37ea43ff81be 210 byteArrayToHexString(mac.data(), mac.size(), httpPost);
IanBenzMaxim 1:e1c7c1c636af 211 httpPost += newline;
IanBenzMaxim 1:e1c7c1c636af 212
IanBenzMaxim 1:e1c7c1c636af 213 return httpPost;
IanBenzMaxim 1:e1c7c1c636af 214 }
IanBenzMaxim 1:e1c7c1c636af 215
IanBenzMaxim 6:b6bafd0a7013 216 bool WebServerInterface::authPostHttpEvent(ISha256MacCoproc & macCoproc, PostEvent event, const std::string & postData, bool setSecret)
IanBenzMaxim 1:e1c7c1c636af 217 {
IanBenzMaxim 1:e1c7c1c636af 218 bool result;
IanBenzMaxim 1:e1c7c1c636af 219
IanBenzMaxim 1:e1c7c1c636af 220 if (setSecret)
IanBenzMaxim 1:e1c7c1c636af 221 {
IanBenzMaxim 25:37ea43ff81be 222 result = setHttpPostSecret(macCoproc, m_sessionId);
IanBenzMaxim 1:e1c7c1c636af 223 if (!result)
IanBenzMaxim 1:e1c7c1c636af 224 return result;
IanBenzMaxim 1:e1c7c1c636af 225 }
IanBenzMaxim 1:e1c7c1c636af 226
IanBenzMaxim 1:e1c7c1c636af 227 // Open connection
IanBenzMaxim 28:e5cdaf13d299 228 TCPSocket socket(&networkStack);
IanBenzMaxim 28:e5cdaf13d299 229 result = (socket.connect(serverAddress, 80) == 0);
IanBenzMaxim 1:e1c7c1c636af 230 if (result)
IanBenzMaxim 1:e1c7c1c636af 231 {
IanBenzMaxim 1:e1c7c1c636af 232 // Request challenge
IanBenzMaxim 28:e5cdaf13d299 233 std::string httpData = formatHttpGet(serverAddress, serverChallengePath, m_sessionIdString);
IanBenzMaxim 28:e5cdaf13d299 234 result = (socket.send(httpData.data(), httpData.size()) == httpData.size());
IanBenzMaxim 1:e1c7c1c636af 235 if (result)
IanBenzMaxim 1:e1c7c1c636af 236 {
IanBenzMaxim 1:e1c7c1c636af 237 // Receive server response
IanBenzMaxim 28:e5cdaf13d299 238 int recvResult = socket.recv(recvBuf, sizeof(recvBuf) / sizeof(recvBuf[0]));
IanBenzMaxim 28:e5cdaf13d299 239 result = recvResult > 0;
IanBenzMaxim 28:e5cdaf13d299 240
IanBenzMaxim 28:e5cdaf13d299 241 if (result)
IanBenzMaxim 28:e5cdaf13d299 242 {
IanBenzMaxim 28:e5cdaf13d299 243 // Parse challenge from response
IanBenzMaxim 28:e5cdaf13d299 244 const std::string challengeSearch(newline + newline);
IanBenzMaxim 28:e5cdaf13d299 245 httpData.assign(recvBuf, recvResult);
IanBenzMaxim 28:e5cdaf13d299 246 size_t challengePos = httpData.find(challengeSearch);
IanBenzMaxim 28:e5cdaf13d299 247 if ((challengePos != std::string::npos) && ((challengePos + challengeSearch.length() + (challengeLen * charsPerByte)) <= httpData.length()))
IanBenzMaxim 1:e1c7c1c636af 248 {
IanBenzMaxim 28:e5cdaf13d299 249 uint8_t challenge[challengeLen];
IanBenzMaxim 28:e5cdaf13d299 250 challengePos += challengeSearch.length();
IanBenzMaxim 28:e5cdaf13d299 251 for (size_t i = 0; i < challengeLen; i++)
IanBenzMaxim 1:e1c7c1c636af 252 {
IanBenzMaxim 28:e5cdaf13d299 253 std::sscanf(httpData.substr(challengePos + (i * charsPerByte), charsPerByte).c_str(), "%2hhx", &challenge[i]);
IanBenzMaxim 1:e1c7c1c636af 254 }
IanBenzMaxim 28:e5cdaf13d299 255
IanBenzMaxim 28:e5cdaf13d299 256 // Post sensor data
IanBenzMaxim 28:e5cdaf13d299 257 httpData = formatHttpPost(serverAddress, serverPostPath, m_sessionIdString, macCoproc, event, postData, challenge);
IanBenzMaxim 28:e5cdaf13d299 258 result = (socket.send(httpData.data(), httpData.size()) == httpData.size());
IanBenzMaxim 28:e5cdaf13d299 259 if (result)
IanBenzMaxim 1:e1c7c1c636af 260 {
IanBenzMaxim 28:e5cdaf13d299 261 result = (socket.recv(recvBuf, sizeof(recvBuf) / sizeof(recvBuf[0])) >= 0);
IanBenzMaxim 1:e1c7c1c636af 262 }
IanBenzMaxim 1:e1c7c1c636af 263 }
IanBenzMaxim 1:e1c7c1c636af 264 }
IanBenzMaxim 1:e1c7c1c636af 265 }
IanBenzMaxim 1:e1c7c1c636af 266
IanBenzMaxim 1:e1c7c1c636af 267 // Close connection
IanBenzMaxim 28:e5cdaf13d299 268 socket.close();
IanBenzMaxim 1:e1c7c1c636af 269 }
IanBenzMaxim 1:e1c7c1c636af 270
IanBenzMaxim 1:e1c7c1c636af 271 return result;
IanBenzMaxim 1:e1c7c1c636af 272 }
IanBenzMaxim 1:e1c7c1c636af 273
IanBenzMaxim 1:e1c7c1c636af 274 std::string WebServerInterface::formatSensorDataPostBody(const SensorData & sensorData)
IanBenzMaxim 1:e1c7c1c636af 275 {
IanBenzMaxim 1:e1c7c1c636af 276 // Create initial post body string from input data
IanBenzMaxim 1:e1c7c1c636af 277 std::ostringstream postBodyStream;
IanBenzMaxim 1:e1c7c1c636af 278 postBodyStream << "Temp" << keyValSeparator << static_cast<int>(sensorData.temp);
IanBenzMaxim 1:e1c7c1c636af 279 postBodyStream << fieldSeparator;
IanBenzMaxim 1:e1c7c1c636af 280 postBodyStream << "FilterLife" << keyValSeparator << static_cast<unsigned>(sensorData.filterLife);
IanBenzMaxim 1:e1c7c1c636af 281 postBodyStream << fieldSeparator;
IanBenzMaxim 1:e1c7c1c636af 282 postBodyStream << "TempAlarm" << keyValSeparator << (sensorData.tempAlarm() ? "true" : "false");
IanBenzMaxim 1:e1c7c1c636af 283 postBodyStream << fieldSeparator;
IanBenzMaxim 1:e1c7c1c636af 284 postBodyStream << "FilterLifeAlarm" << keyValSeparator << (sensorData.filterLifeAlarm() ? "true" : "false");
IanBenzMaxim 1:e1c7c1c636af 285 return postBodyStream.str();
IanBenzMaxim 25:37ea43ff81be 286 }
IanBenzMaxim 25:37ea43ff81be 287
IanBenzMaxim 25:37ea43ff81be 288 void WebServerInterface::setSessionId(const OneWire::RomId & sessionId)
IanBenzMaxim 25:37ea43ff81be 289 {
IanBenzMaxim 25:37ea43ff81be 290 m_sessionIdString = byteArrayToHexString(sessionId.buffer.data(), sessionId.buffer.size());
IanBenzMaxim 25:37ea43ff81be 291 m_sessionId = sessionId;
IanBenzMaxim 1:e1c7c1c636af 292 }