1 | // Copyright (c) Microsoft. All rights reserved.
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2 | // Licensed under the MIT license. See LICENSE file in the project root for full license information.
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3 |
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4 | #include <stdlib.h>
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5 | #include <stddef.h>
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6 | #include <stdio.h>
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7 | #include <string.h>
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8 | #include "azure_c_shared_utility/tlsio.h"
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9 | #include "azure_c_shared_utility/tlsio_esp_at.h"
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10 | #include "azure_c_shared_utility/singlylinkedlist.h"
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11 | #include "azure_c_shared_utility/esp_at_socket.h"
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12 | #include "azure_c_shared_utility/optimize_size.h"
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13 | #include "azure_c_shared_utility/xlogging.h"
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14 |
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15 | #define ESP_AT_XIO_RECEIVE_BUFFER_SIZE 128
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16 |
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17 | typedef enum IO_STATE_TAG
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18 | {
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19 | IO_STATE_CLOSED,
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20 | IO_STATE_OPENING,
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21 | IO_STATE_OPEN,
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22 | IO_STATE_CLOSING,
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23 | IO_STATE_ERROR
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24 | } IO_STATE;
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25 |
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26 | typedef struct PENDING_TLS_IO_TAG
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27 | {
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28 | unsigned char* bytes;
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29 | size_t size;
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30 | ON_SEND_COMPLETE on_send_complete;
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31 | void* callback_context;
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32 | SINGLYLINKEDLIST_HANDLE pending_io_list;
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33 | } PENDING_TLS_IO;
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34 |
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35 | typedef struct TLS_IO_INSTANCE_TAG
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36 | {
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37 | ESP_AT_SOCKET_HANDLE tcp_socket_connection;
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38 | ON_BYTES_RECEIVED on_bytes_received;
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39 | ON_IO_ERROR on_io_error;
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40 | void* on_bytes_received_context;
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41 | void* on_io_error_context;
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42 | char* hostname;
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43 | int port;
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44 | IO_STATE io_state;
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45 | SINGLYLINKEDLIST_HANDLE pending_io_list;
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46 | } TLS_IO_INSTANCE;
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47 |
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48 | /*this function will clone an option given by name and value*/
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49 | static void* tlsio_esp_at_CloneOption(const char* name, const void* value)
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50 | {
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51 | (void)name;
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52 | (void)value;
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53 | return NULL;
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54 | }
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55 |
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56 | /*this function destroys an option previously created*/
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57 | static void tlsio_esp_at_DestroyOption(const char* name, const void* value)
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58 | {
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59 | (void)name;
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60 | (void)value;
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61 | }
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62 |
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63 | static OPTIONHANDLER_HANDLE tlsio_esp_at_retrieveoptions(CONCRETE_IO_HANDLE tlsio_esp_at)
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64 | {
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65 | OPTIONHANDLER_HANDLE result;
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66 | (void)tlsio_esp_at;
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67 | result = OptionHandler_Create(tlsio_esp_at_CloneOption, tlsio_esp_at_DestroyOption, tlsio_esp_at_setoption);
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68 | if (result == NULL)
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69 | {
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70 | /*return as is*/
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71 | }
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72 | else
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73 | {
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74 | /*insert here work to add the options to "result" handle*/
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75 | }
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76 | return result;
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77 | }
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78 |
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79 | static const IO_INTERFACE_DESCRIPTION tlsio_esp_at_interface_description =
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80 | {
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81 | tlsio_esp_at_retrieveoptions,
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82 | tlsio_esp_at_create,
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83 | tlsio_esp_at_destroy,
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84 | tlsio_esp_at_open,
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85 | tlsio_esp_at_close,
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86 | tlsio_esp_at_send,
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87 | tlsio_esp_at_dowork,
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88 | tlsio_esp_at_setoption
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89 | };
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90 |
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91 | static void indicate_error(TLS_IO_INSTANCE* tlsio_esp_at_instance)
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92 | {
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93 | if ((tlsio_esp_at_instance->io_state == IO_STATE_CLOSED)
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94 | || (tlsio_esp_at_instance->io_state == IO_STATE_ERROR))
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95 | {
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96 | return;
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97 | }
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98 | tlsio_esp_at_instance->io_state = IO_STATE_ERROR;
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99 | if (tlsio_esp_at_instance->on_io_error != NULL)
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100 | {
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101 | tlsio_esp_at_instance->on_io_error(tlsio_esp_at_instance->on_io_error_context);
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102 | }
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103 | }
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104 |
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105 | static int add_pending_io(TLS_IO_INSTANCE* tlsio_esp_at_instance, const unsigned char* buffer, size_t size, ON_SEND_COMPLETE on_send_complete, void* callback_context)
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106 | {
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107 | int result;
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108 | PENDING_TLS_IO* pending_tlsio_esp_at = (PENDING_TLS_IO*)malloc(sizeof(PENDING_TLS_IO));
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109 | if (pending_tlsio_esp_at == NULL)
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110 | {
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111 | LogError("Allocation Failure: Unable to allocate pending list.");
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112 | result = MU_FAILURE;
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113 | }
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114 | else
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115 | {
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116 | pending_tlsio_esp_at->bytes = (unsigned char*)malloc(size);
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117 | if (pending_tlsio_esp_at->bytes == NULL)
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118 | {
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119 | LogError("Allocation Failure: Unable to allocate pending list.");
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120 | free(pending_tlsio_esp_at);
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121 | result = MU_FAILURE;
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122 | }
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123 | else
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124 | {
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125 | pending_tlsio_esp_at->size = size;
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126 | pending_tlsio_esp_at->on_send_complete = on_send_complete;
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127 | pending_tlsio_esp_at->callback_context = callback_context;
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128 | pending_tlsio_esp_at->pending_io_list = tlsio_esp_at_instance->pending_io_list;
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129 | (void)memcpy(pending_tlsio_esp_at->bytes, buffer, size);
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130 | if (singlylinkedlist_add(tlsio_esp_at_instance->pending_io_list, pending_tlsio_esp_at) == NULL)
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131 | {
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132 | LogError("Failure: Unable to add socket to pending list.");
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133 | free(pending_tlsio_esp_at->bytes);
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134 | free(pending_tlsio_esp_at);
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135 | result = MU_FAILURE;
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136 | }
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137 | else
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138 | {
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139 | result = 0;
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140 | }
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141 | }
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142 | }
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143 |
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144 | return result;
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145 | }
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146 |
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147 | #define NSAPI_ERROR_WOULD_BLOCK -3001
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148 |
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149 | static int retrieve_data(TLS_IO_INSTANCE* tlsio_esp_at_instance)
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150 | {
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151 | int received = 1;
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152 | int total_received = 0;
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153 |
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154 | unsigned char* recv_bytes = malloc(ESP_AT_XIO_RECEIVE_BUFFER_SIZE);
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155 | if (recv_bytes == NULL)
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156 | {
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157 | LogError("Socketio_Failure: NULL allocating input buffer.");
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158 | indicate_error(tlsio_esp_at_instance);
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159 | return -1;
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160 | }
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161 |
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162 | while (received > 0)
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163 | {
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164 | received = esp_at_socket_receive(tlsio_esp_at_instance->tcp_socket_connection, (char*)recv_bytes, ESP_AT_XIO_RECEIVE_BUFFER_SIZE);
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165 | if (received > 0)
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166 | {
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167 | total_received += received;
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168 | if (tlsio_esp_at_instance->on_bytes_received != NULL)
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169 | {
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170 | /* explictly ignoring here the result of the callback */
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171 | tlsio_esp_at_instance->on_bytes_received(tlsio_esp_at_instance->on_bytes_received_context, recv_bytes, received);
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172 | }
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173 | }
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174 | else if (received < 0)
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175 | {
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176 | if(received != NSAPI_ERROR_WOULD_BLOCK) // NSAPI_ERROR_WOULD_BLOCK is not a real error but pending.
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177 | {
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178 | indicate_error(tlsio_esp_at_instance);
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179 | LogError("Socketio_Failure: underlying IO error %d.", received);
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180 | free(recv_bytes);
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181 | return -1;
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182 | }
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183 | }
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184 | }
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185 | free(recv_bytes);
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186 |
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187 | return total_received;
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188 | }
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189 |
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190 | static int send_queued_data(TLS_IO_INSTANCE* tlsio_esp_at_instance)
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191 | {
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192 | int errors = 0;
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193 | int sent = 0;
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194 |
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195 | LIST_ITEM_HANDLE first_pending_io = singlylinkedlist_get_head_item(tlsio_esp_at_instance->pending_io_list);
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196 | while (first_pending_io != NULL)
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197 | {
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198 | PENDING_TLS_IO* pending_tlsio_esp_at = (PENDING_TLS_IO*)singlylinkedlist_item_get_value(first_pending_io);
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199 | if (pending_tlsio_esp_at == NULL)
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200 | {
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201 | indicate_error(tlsio_esp_at_instance);
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202 | return -1;
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203 | }
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204 |
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205 | int send_result = esp_at_socket_send(tlsio_esp_at_instance->tcp_socket_connection, (const char*)pending_tlsio_esp_at->bytes, pending_tlsio_esp_at->size);
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206 | if (send_result != (int)pending_tlsio_esp_at->size)
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207 | {
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208 | if (send_result == 0)
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209 | {
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210 | // The underlying network layer may encounter hardware / environment issues,
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211 | // but the driver doesn't handle it properly. So here the send API always return 0,
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212 | // this causes the program running into dead loop if not check it here.
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213 | if (errors++ >= 10)
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214 | {
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215 | // Treat it as a network error after try 10 times.
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216 | LogError("Socketio_Failure: encountered unknow connection issue, the connection will be restarted.");
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217 | indicate_error(tlsio_esp_at_instance);
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218 | return -1;
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219 | }
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220 | ThreadAPI_Sleep(10);
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221 | }
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222 | else if (send_result < 0)
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223 | {
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224 | indicate_error(tlsio_esp_at_instance);
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225 | return -1;
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226 | }
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227 | else
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228 | {
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229 | /* send something, wait for the rest */
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230 | memmove(pending_tlsio_esp_at->bytes, pending_tlsio_esp_at->bytes + send_result, pending_tlsio_esp_at->size - send_result);
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231 | sent += send_result;
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232 | }
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233 | }
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234 | else
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235 | {
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236 | sent += send_result;
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237 | if (pending_tlsio_esp_at->on_send_complete != NULL)
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238 | {
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239 | pending_tlsio_esp_at->on_send_complete(pending_tlsio_esp_at->callback_context, IO_SEND_OK);
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240 | }
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241 |
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242 | free(pending_tlsio_esp_at->bytes);
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243 | free(pending_tlsio_esp_at);
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244 | if (singlylinkedlist_remove(tlsio_esp_at_instance->pending_io_list, first_pending_io) != 0)
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245 | {
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246 | indicate_error(tlsio_esp_at_instance);
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247 | return -1;
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248 | }
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249 | errors = 0;
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250 | }
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251 |
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252 | first_pending_io = singlylinkedlist_get_head_item(tlsio_esp_at_instance->pending_io_list);
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253 | }
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254 |
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255 | return sent;
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256 | }
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257 |
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258 | static void close_tcp_connection(TLS_IO_INSTANCE* tlsio_esp_at_instance)
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259 | {
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260 | if (tlsio_esp_at_instance->io_state != IO_STATE_CLOSED)
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261 | {
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262 | if (tlsio_esp_at_instance->tcp_socket_connection != NULL)
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263 | {
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264 | esp_at_socket_close(tlsio_esp_at_instance->tcp_socket_connection);
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265 | esp_at_socket_destroy(tlsio_esp_at_instance->tcp_socket_connection);
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266 | tlsio_esp_at_instance->tcp_socket_connection = NULL;
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267 | }
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268 | tlsio_esp_at_instance->io_state = IO_STATE_CLOSED;
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269 | }
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270 | }
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271 |
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272 | CONCRETE_IO_HANDLE tlsio_esp_at_create(void* io_create_parameters)
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273 | {
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274 | TLSIO_CONFIG* tlsio_esp_at_config = io_create_parameters;
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275 | TLS_IO_INSTANCE* result;
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276 |
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277 | if (tlsio_esp_at_config == NULL)
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278 | {
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279 | result = NULL;
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280 | }
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281 | else
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282 | {
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283 | result = (TLS_IO_INSTANCE*)malloc(sizeof(TLS_IO_INSTANCE));
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284 | if (result == NULL) {
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285 | LogError("Socketio_Failure: NULL allocating socket io instance.");
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286 | }
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287 | else
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288 | {
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289 | result->pending_io_list = singlylinkedlist_create();
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290 | if (result->pending_io_list == NULL)
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291 | {
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292 | free(result);
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293 | result = NULL;
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294 | }
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295 | else
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296 | {
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297 | result->hostname = strdup(tlsio_esp_at_config->hostname);
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298 | if (result->hostname == NULL)
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299 | {
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300 | singlylinkedlist_destroy(result->pending_io_list);
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301 | free(result);
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302 | result = NULL;
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303 | }
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304 | else
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305 | {
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306 | result->port = tlsio_esp_at_config->port;
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307 | result->on_bytes_received = NULL;
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308 | result->on_io_error = NULL;
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309 | result->on_bytes_received_context = NULL;
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310 | result->on_io_error_context = NULL;
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311 | result->io_state = IO_STATE_CLOSED;
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312 | result->tcp_socket_connection = NULL;
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313 | }
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314 | }
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315 | }
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316 | }
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317 |
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318 | return result;
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319 | }
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320 |
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321 | void tlsio_esp_at_destroy(CONCRETE_IO_HANDLE tlsio_esp_at)
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322 | {
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323 | if (tlsio_esp_at != NULL)
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324 | {
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325 | TLS_IO_INSTANCE* tlsio_esp_at_instance = (TLS_IO_INSTANCE*)tlsio_esp_at;
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326 |
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327 | // Close the tcp connection
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328 | close_tcp_connection(tlsio_esp_at_instance);
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329 |
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330 | // Clear all pending IOs
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331 | LIST_ITEM_HANDLE first_pending_io = singlylinkedlist_get_head_item(tlsio_esp_at_instance->pending_io_list);
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332 | while (first_pending_io != NULL)
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333 | {
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334 | PENDING_TLS_IO* pending_tlsio_esp_at = (PENDING_TLS_IO*)singlylinkedlist_item_get_value(first_pending_io);
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335 | if (pending_tlsio_esp_at != NULL)
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336 | {
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337 | free(pending_tlsio_esp_at->bytes);
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338 | free(pending_tlsio_esp_at);
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339 | }
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340 |
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341 | (void)singlylinkedlist_remove(tlsio_esp_at_instance->pending_io_list, first_pending_io);
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342 | first_pending_io = singlylinkedlist_get_head_item(tlsio_esp_at_instance->pending_io_list);
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343 | }
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344 | singlylinkedlist_destroy(tlsio_esp_at_instance->pending_io_list);
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345 |
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346 | if(tlsio_esp_at_instance->hostname != NULL)
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347 | {
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348 | free(tlsio_esp_at_instance->hostname);
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349 | tlsio_esp_at_instance->hostname = NULL;
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350 | }
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351 | free(tlsio_esp_at);
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352 | }
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353 | }
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354 |
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355 | int tlsio_esp_at_open(CONCRETE_IO_HANDLE tlsio_esp_at, ON_IO_OPEN_COMPLETE on_io_open_complete, void* on_io_open_complete_context, ON_BYTES_RECEIVED on_bytes_received, void* on_bytes_received_context, ON_IO_ERROR on_io_error, void* on_io_error_context)
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356 | {
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357 | int result;
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358 | TLS_IO_INSTANCE* tlsio_esp_at_instance = (TLS_IO_INSTANCE*)tlsio_esp_at;
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359 |
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360 |
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361 | if (tlsio_esp_at_instance == NULL ||
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362 | tlsio_esp_at_instance->io_state != IO_STATE_CLOSED)
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363 | {
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364 | result = MU_FAILURE;
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365 | }
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366 | else
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367 | {
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368 | tlsio_esp_at_instance->tcp_socket_connection = esp_at_socket_create(true);
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369 | if (tlsio_esp_at_instance->tcp_socket_connection == NULL)
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370 | {
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371 | result = MU_FAILURE;
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372 | }
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373 | else
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374 | {
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375 | if (esp_at_socket_connect(tlsio_esp_at_instance->tcp_socket_connection, tlsio_esp_at_instance->hostname, tlsio_esp_at_instance->port) != 0)
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376 | {
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377 | esp_at_socket_destroy(tlsio_esp_at_instance->tcp_socket_connection);
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378 | tlsio_esp_at_instance->tcp_socket_connection = NULL;
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379 | result = MU_FAILURE;
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380 | }
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381 | else
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382 | {
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383 | esp_at_socket_set_blocking(tlsio_esp_at_instance->tcp_socket_connection, false, 0);
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384 |
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385 | tlsio_esp_at_instance->on_bytes_received = on_bytes_received;
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386 | tlsio_esp_at_instance->on_bytes_received_context = on_bytes_received_context;
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387 |
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388 | tlsio_esp_at_instance->on_io_error = on_io_error;
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389 | tlsio_esp_at_instance->on_io_error_context = on_io_error_context;
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390 |
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391 | tlsio_esp_at_instance->io_state = IO_STATE_OPEN;
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392 |
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393 | result = 0;
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394 | }
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395 | }
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396 | }
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397 |
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398 | if (on_io_open_complete != NULL)
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399 | {
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400 | on_io_open_complete(on_io_open_complete_context, result == 0 ? IO_OPEN_OK : IO_OPEN_ERROR);
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401 | }
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402 |
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403 | return result;
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404 | }
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405 |
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406 | int tlsio_esp_at_close(CONCRETE_IO_HANDLE tlsio_esp_at, ON_IO_CLOSE_COMPLETE on_io_close_complete, void* callback_context)
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407 | {
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408 | int result = 0;
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409 |
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410 | if (tlsio_esp_at == NULL)
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411 | {
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412 | result = MU_FAILURE;
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413 | }
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414 | else
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415 | {
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416 | TLS_IO_INSTANCE* tlsio_esp_at_instance = (TLS_IO_INSTANCE*)tlsio_esp_at;
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417 | if (tlsio_esp_at_instance->io_state == IO_STATE_CLOSED ||
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418 | tlsio_esp_at_instance->io_state == IO_STATE_ERROR)
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419 | {
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420 | result = MU_FAILURE;
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421 | }
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422 | else
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423 | {
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424 | close_tcp_connection(tlsio_esp_at_instance);
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425 | if (on_io_close_complete != NULL)
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426 | {
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427 | on_io_close_complete(callback_context);
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428 | }
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429 | result = 0;
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430 | }
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431 | }
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432 |
|
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433 | return result;
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434 | }
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435 |
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436 | int tlsio_esp_at_send(CONCRETE_IO_HANDLE tlsio_esp_at, const void* buffer, size_t size, ON_SEND_COMPLETE on_send_complete, void* callback_context)
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437 | {
|
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438 | int result;
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439 |
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440 | if ((tlsio_esp_at == NULL) ||
|
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441 | (buffer == NULL) ||
|
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442 | (size == 0))
|
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443 | {
|
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444 | /* Invalid arguments */
|
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445 | result = MU_FAILURE;
|
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446 | }
|
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447 | else
|
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448 | {
|
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449 | result = 0;
|
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450 |
|
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451 | TLS_IO_INSTANCE* tlsio_esp_at_instance = (TLS_IO_INSTANCE*)tlsio_esp_at;
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452 | if (tlsio_esp_at_instance->io_state != IO_STATE_OPEN)
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453 | {
|
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454 | result = MU_FAILURE;
|
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455 | }
|
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456 | else
|
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457 | {
|
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458 | // Queue the data, and the tlsio_esp_at_dowork sends the package later
|
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459 | if (add_pending_io(tlsio_esp_at_instance, buffer, size, on_send_complete, callback_context) != 0)
|
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460 | {
|
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461 | result = MU_FAILURE;
|
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462 | }
|
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463 | }
|
---|
464 | }
|
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465 |
|
---|
466 | return result;
|
---|
467 | }
|
---|
468 |
|
---|
469 | void tlsio_esp_at_dowork(CONCRETE_IO_HANDLE tlsio_esp_at)
|
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470 | {
|
---|
471 | if (tlsio_esp_at != NULL)
|
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472 | {
|
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473 | TLS_IO_INSTANCE* tlsio_esp_at_instance = (TLS_IO_INSTANCE*)tlsio_esp_at;
|
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474 | if (tlsio_esp_at_instance->io_state == IO_STATE_OPEN)
|
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475 | {
|
---|
476 | // Retrieve all data from IoT Hub
|
---|
477 | if (retrieve_data(tlsio_esp_at_instance) < 0)
|
---|
478 | {
|
---|
479 | return;
|
---|
480 | }
|
---|
481 |
|
---|
482 | // Send all packages in the queue
|
---|
483 | send_queued_data(tlsio_esp_at_instance);
|
---|
484 | }
|
---|
485 | }
|
---|
486 | }
|
---|
487 |
|
---|
488 | int tlsio_esp_at_setoption(CONCRETE_IO_HANDLE tlsio_esp_at, const char* optionName, const void* value)
|
---|
489 | {
|
---|
490 | /* Not implementing any options, do nothing */
|
---|
491 | return OPTIONHANDLER_OK;
|
---|
492 | }
|
---|
493 |
|
---|
494 | const IO_INTERFACE_DESCRIPTION* tlsio_esp_at_get_interface_description(void)
|
---|
495 | {
|
---|
496 | return &tlsio_esp_at_interface_description;
|
---|
497 | }
|
---|