Vergil Cola / Mbed OS MQTTGatewayK64

Fork of my MQTTGateway

Dependencies:   mbed-http

MQTTSManager/MQTTPacket/MQTTConnectServer.c@0:f1d3878b8dd9, 2017-04-08 (annotated)

Committer:
vpcola
Date:
Sat Apr 08 14:45:51 2017 +0000
Revision:
0:f1d3878b8dd9
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vpcola 0:f1d3878b8dd9 1 /*******************************************************************************
vpcola 0:f1d3878b8dd9 2 * Copyright (c) 2014 IBM Corp.
vpcola 0:f1d3878b8dd9 3 *
vpcola 0:f1d3878b8dd9 4 * All rights reserved. This program and the accompanying materials
vpcola 0:f1d3878b8dd9 5 * are made available under the terms of the Eclipse Public License v1.0
vpcola 0:f1d3878b8dd9 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
vpcola 0:f1d3878b8dd9 7 *
vpcola 0:f1d3878b8dd9 8 * The Eclipse Public License is available at
vpcola 0:f1d3878b8dd9 9 * http://www.eclipse.org/legal/epl-v10.html
vpcola 0:f1d3878b8dd9 10 * and the Eclipse Distribution License is available at
vpcola 0:f1d3878b8dd9 11 * http://www.eclipse.org/org/documents/edl-v10.php.
vpcola 0:f1d3878b8dd9 12 *
vpcola 0:f1d3878b8dd9 13 * Contributors:
vpcola 0:f1d3878b8dd9 14 * Ian Craggs - initial API and implementation and/or initial documentation
vpcola 0:f1d3878b8dd9 15 *******************************************************************************/
vpcola 0:f1d3878b8dd9 16
vpcola 0:f1d3878b8dd9 17 #include "StackTrace.h"
vpcola 0:f1d3878b8dd9 18 #include "MQTTPacket.h"
vpcola 0:f1d3878b8dd9 19 #include <string.h>
vpcola 0:f1d3878b8dd9 20
vpcola 0:f1d3878b8dd9 21 #define min(a, b) ((a < b) ? a : b)
vpcola 0:f1d3878b8dd9 22
vpcola 0:f1d3878b8dd9 23
vpcola 0:f1d3878b8dd9 24 /**
vpcola 0:f1d3878b8dd9 25 * Validates MQTT protocol name and version combinations
vpcola 0:f1d3878b8dd9 26 * @param protocol the MQTT protocol name as an MQTTString
vpcola 0:f1d3878b8dd9 27 * @param version the MQTT protocol version number, as in the connect packet
vpcola 0:f1d3878b8dd9 28 * @return correct MQTT combination? 1 is true, 0 is false
vpcola 0:f1d3878b8dd9 29 */
vpcola 0:f1d3878b8dd9 30 int MQTTPacket_checkVersion(MQTTString* protocol, int version)
vpcola 0:f1d3878b8dd9 31 {
vpcola 0:f1d3878b8dd9 32 int rc = 0;
vpcola 0:f1d3878b8dd9 33
vpcola 0:f1d3878b8dd9 34 if (version == 3 && memcmp(protocol->lenstring.data, "MQIdsp",
vpcola 0:f1d3878b8dd9 35 min(6, protocol->lenstring.len)) == 0)
vpcola 0:f1d3878b8dd9 36 rc = 1;
vpcola 0:f1d3878b8dd9 37 else if (version == 4 && memcmp(protocol->lenstring.data, "MQTT",
vpcola 0:f1d3878b8dd9 38 min(4, protocol->lenstring.len)) == 0)
vpcola 0:f1d3878b8dd9 39 rc = 1;
vpcola 0:f1d3878b8dd9 40 return rc;
vpcola 0:f1d3878b8dd9 41 }
vpcola 0:f1d3878b8dd9 42
vpcola 0:f1d3878b8dd9 43
vpcola 0:f1d3878b8dd9 44 /**
vpcola 0:f1d3878b8dd9 45 * Deserializes the supplied (wire) buffer into connect data structure
vpcola 0:f1d3878b8dd9 46 * @param data the connect data structure to be filled out
vpcola 0:f1d3878b8dd9 47 * @param buf the raw buffer data, of the correct length determined by the remaining length field
vpcola 0:f1d3878b8dd9 48 * @param len the length in bytes of the data in the supplied buffer
vpcola 0:f1d3878b8dd9 49 * @return error code. 1 is success, 0 is failure
vpcola 0:f1d3878b8dd9 50 */
vpcola 0:f1d3878b8dd9 51 int MQTTDeserialize_connect(MQTTPacket_connectData* data, unsigned char* buf, int len)
vpcola 0:f1d3878b8dd9 52 {
vpcola 0:f1d3878b8dd9 53 MQTTHeader header = {0};
vpcola 0:f1d3878b8dd9 54 MQTTConnectFlags flags = {0};
vpcola 0:f1d3878b8dd9 55 unsigned char* curdata = buf;
vpcola 0:f1d3878b8dd9 56 unsigned char* enddata = &buf[len];
vpcola 0:f1d3878b8dd9 57 int rc = 0;
vpcola 0:f1d3878b8dd9 58 MQTTString Protocol;
vpcola 0:f1d3878b8dd9 59 int version;
vpcola 0:f1d3878b8dd9 60 int mylen = 0;
vpcola 0:f1d3878b8dd9 61
vpcola 0:f1d3878b8dd9 62 FUNC_ENTRY;
vpcola 0:f1d3878b8dd9 63 header.byte = readChar(&curdata);
vpcola 0:f1d3878b8dd9 64 if (header.bits.type != CONNECT)
vpcola 0:f1d3878b8dd9 65 goto exit;
vpcola 0:f1d3878b8dd9 66
vpcola 0:f1d3878b8dd9 67 curdata += MQTTPacket_decodeBuf(curdata, &mylen); /* read remaining length */
vpcola 0:f1d3878b8dd9 68
vpcola 0:f1d3878b8dd9 69 if (!readMQTTLenString(&Protocol, &curdata, enddata) ||
vpcola 0:f1d3878b8dd9 70 enddata - curdata < 0) /* do we have enough data to read the protocol version byte? */
vpcola 0:f1d3878b8dd9 71 goto exit;
vpcola 0:f1d3878b8dd9 72
vpcola 0:f1d3878b8dd9 73 version = (int)readChar(&curdata); /* Protocol version */
vpcola 0:f1d3878b8dd9 74 /* If we don't recognize the protocol version, we don't parse the connect packet on the
vpcola 0:f1d3878b8dd9 75 * basis that we don't know what the format will be.
vpcola 0:f1d3878b8dd9 76 */
vpcola 0:f1d3878b8dd9 77 if (MQTTPacket_checkVersion(&Protocol, version))
vpcola 0:f1d3878b8dd9 78 {
vpcola 0:f1d3878b8dd9 79 flags.all = readChar(&curdata);
vpcola 0:f1d3878b8dd9 80 data->cleansession = flags.bits.cleansession;
vpcola 0:f1d3878b8dd9 81 data->keepAliveInterval = readInt(&curdata);
vpcola 0:f1d3878b8dd9 82 if (!readMQTTLenString(&data->clientID, &curdata, enddata))
vpcola 0:f1d3878b8dd9 83 goto exit;
vpcola 0:f1d3878b8dd9 84 if (flags.bits.will)
vpcola 0:f1d3878b8dd9 85 {
vpcola 0:f1d3878b8dd9 86 data->willFlag = 1;
vpcola 0:f1d3878b8dd9 87 data->will.qos = flags.bits.willQoS;
vpcola 0:f1d3878b8dd9 88 data->will.retained = flags.bits.willRetain;
vpcola 0:f1d3878b8dd9 89 if (!readMQTTLenString(&data->will.topicName, &curdata, enddata) ||
vpcola 0:f1d3878b8dd9 90 !readMQTTLenString(&data->will.message, &curdata, enddata))
vpcola 0:f1d3878b8dd9 91 goto exit;
vpcola 0:f1d3878b8dd9 92 }
vpcola 0:f1d3878b8dd9 93 if (flags.bits.username)
vpcola 0:f1d3878b8dd9 94 {
vpcola 0:f1d3878b8dd9 95 if (enddata - curdata < 3 || !readMQTTLenString(&data->username, &curdata, enddata))
vpcola 0:f1d3878b8dd9 96 goto exit; /* username flag set, but no username supplied - invalid */
vpcola 0:f1d3878b8dd9 97 if (flags.bits.password &&
vpcola 0:f1d3878b8dd9 98 (enddata - curdata < 3 || !readMQTTLenString(&data->password, &curdata, enddata)))
vpcola 0:f1d3878b8dd9 99 goto exit; /* password flag set, but no password supplied - invalid */
vpcola 0:f1d3878b8dd9 100 }
vpcola 0:f1d3878b8dd9 101 else if (flags.bits.password)
vpcola 0:f1d3878b8dd9 102 goto exit; /* password flag set without username - invalid */
vpcola 0:f1d3878b8dd9 103 rc = 1;
vpcola 0:f1d3878b8dd9 104 }
vpcola 0:f1d3878b8dd9 105 exit:
vpcola 0:f1d3878b8dd9 106 FUNC_EXIT_RC(rc);
vpcola 0:f1d3878b8dd9 107 return rc;
vpcola 0:f1d3878b8dd9 108 }
vpcola 0:f1d3878b8dd9 109
vpcola 0:f1d3878b8dd9 110
vpcola 0:f1d3878b8dd9 111 /**
vpcola 0:f1d3878b8dd9 112 * Serializes the connack packet into the supplied buffer.
vpcola 0:f1d3878b8dd9 113 * @param buf the buffer into which the packet will be serialized
vpcola 0:f1d3878b8dd9 114 * @param buflen the length in bytes of the supplied buffer
vpcola 0:f1d3878b8dd9 115 * @param connack_rc the integer connack return code to be used
vpcola 0:f1d3878b8dd9 116 * @param sessionPresent the MQTT 3.1.1 sessionPresent flag
vpcola 0:f1d3878b8dd9 117 * @return serialized length, or error if 0
vpcola 0:f1d3878b8dd9 118 */
vpcola 0:f1d3878b8dd9 119 int MQTTSerialize_connack(unsigned char* buf, int buflen, unsigned char connack_rc, unsigned char sessionPresent)
vpcola 0:f1d3878b8dd9 120 {
vpcola 0:f1d3878b8dd9 121 MQTTHeader header = {0};
vpcola 0:f1d3878b8dd9 122 int rc = 0;
vpcola 0:f1d3878b8dd9 123 unsigned char *ptr = buf;
vpcola 0:f1d3878b8dd9 124 MQTTConnackFlags flags = {0};
vpcola 0:f1d3878b8dd9 125
vpcola 0:f1d3878b8dd9 126 FUNC_ENTRY;
vpcola 0:f1d3878b8dd9 127 if (buflen < 2)
vpcola 0:f1d3878b8dd9 128 {
vpcola 0:f1d3878b8dd9 129 rc = MQTTPACKET_BUFFER_TOO_SHORT;
vpcola 0:f1d3878b8dd9 130 goto exit;
vpcola 0:f1d3878b8dd9 131 }
vpcola 0:f1d3878b8dd9 132 header.byte = 0;
vpcola 0:f1d3878b8dd9 133 header.bits.type = CONNACK;
vpcola 0:f1d3878b8dd9 134 writeChar(&ptr, header.byte); /* write header */
vpcola 0:f1d3878b8dd9 135
vpcola 0:f1d3878b8dd9 136 ptr += MQTTPacket_encode(ptr, 2); /* write remaining length */
vpcola 0:f1d3878b8dd9 137
vpcola 0:f1d3878b8dd9 138 flags.all = 0;
vpcola 0:f1d3878b8dd9 139 flags.bits.sessionpresent = sessionPresent;
vpcola 0:f1d3878b8dd9 140 writeChar(&ptr, flags.all);
vpcola 0:f1d3878b8dd9 141 writeChar(&ptr, connack_rc);
vpcola 0:f1d3878b8dd9 142
vpcola 0:f1d3878b8dd9 143 rc = ptr - buf;
vpcola 0:f1d3878b8dd9 144 exit:
vpcola 0:f1d3878b8dd9 145 FUNC_EXIT_RC(rc);
vpcola 0:f1d3878b8dd9 146 return rc;
vpcola 0:f1d3878b8dd9 147 }
vpcola 0:f1d3878b8dd9 148