1 /** 2 * Describes high level functions for converting an entire CPER log, and functions for parsing 3 * CPER headers and section descriptions into an intermediate JSON format. 4 * 5 * Author: Lawrence.Tang@arm.com 6 **/ 7 8 #include <stdio.h> 9 #include <json.h> 10 #include "b64.h" 11 #include "edk/Cper.h" 12 #include "cper-parse.h" 13 #include "cper-utils.h" 14 #include "sections/cper-section.h" 15 16 //Private pre-definitions. 17 json_object *cper_header_to_ir(EFI_COMMON_ERROR_RECORD_HEADER *header); 18 json_object * 19 cper_section_descriptor_to_ir(EFI_ERROR_SECTION_DESCRIPTOR *section_descriptor); 20 json_object *cper_section_to_ir(FILE *handle, long base_pos, 21 EFI_ERROR_SECTION_DESCRIPTOR *descriptor); 22 23 //Reads a CPER log file at the given file location, and returns an intermediate 24 //JSON representation of this CPER record. 25 json_object *cper_to_ir(FILE *cper_file) 26 { 27 //Read the current file pointer location as the base of the record. 28 long base_pos = ftell(cper_file); 29 30 //Ensure this is really a CPER log. 31 EFI_COMMON_ERROR_RECORD_HEADER header; 32 if (fread(&header, sizeof(EFI_COMMON_ERROR_RECORD_HEADER), 1, 33 cper_file) != 1) { 34 printf("Invalid CPER file: Invalid length (log too short).\n"); 35 return NULL; 36 } 37 38 //Check if the header contains the magic bytes ("CPER"). 39 if (header.SignatureStart != EFI_ERROR_RECORD_SIGNATURE_START) { 40 printf("Invalid CPER file: Invalid header (incorrect signature).\n"); 41 return NULL; 42 } 43 44 //Create the header JSON object from the read bytes. 45 json_object *header_ir = cper_header_to_ir(&header); 46 47 //Read the appropriate number of section descriptors & sections, and convert them into IR format. 48 json_object *section_descriptors_ir = json_object_new_array(); 49 json_object *sections_ir = json_object_new_array(); 50 for (int i = 0; i < header.SectionCount; i++) { 51 //Create the section descriptor. 52 EFI_ERROR_SECTION_DESCRIPTOR section_descriptor; 53 if (fread(§ion_descriptor, 54 sizeof(EFI_ERROR_SECTION_DESCRIPTOR), 1, 55 cper_file) != 1) { 56 printf("Invalid number of section headers: Header states %d sections, could not read section %d.\n", 57 header.SectionCount, i + 1); 58 return NULL; 59 } 60 json_object_array_add( 61 section_descriptors_ir, 62 cper_section_descriptor_to_ir(§ion_descriptor)); 63 64 //Read the section itself. 65 json_object_array_add(sections_ir, 66 cper_section_to_ir(cper_file, base_pos, 67 §ion_descriptor)); 68 } 69 70 //Add the header, section descriptors, and sections to a parent object. 71 json_object *parent = json_object_new_object(); 72 json_object_object_add(parent, "header", header_ir); 73 json_object_object_add(parent, "sectionDescriptors", 74 section_descriptors_ir); 75 json_object_object_add(parent, "sections", sections_ir); 76 77 return parent; 78 } 79 80 //Converts a parsed CPER record header into intermediate JSON object format. 81 json_object *cper_header_to_ir(EFI_COMMON_ERROR_RECORD_HEADER *header) 82 { 83 json_object *header_ir = json_object_new_object(); 84 85 //Revision/version information. 86 json_object_object_add(header_ir, "revision", 87 revision_to_ir(header->Revision)); 88 89 //Section count. 90 json_object_object_add(header_ir, "sectionCount", 91 json_object_new_int(header->SectionCount)); 92 93 //Error severity (with interpreted string version). 94 json_object *error_severity = json_object_new_object(); 95 json_object_object_add(error_severity, "code", 96 json_object_new_uint64(header->ErrorSeverity)); 97 json_object_object_add(error_severity, "name", 98 json_object_new_string(severity_to_string( 99 header->ErrorSeverity))); 100 json_object_object_add(header_ir, "severity", error_severity); 101 102 //The validation bits for each section. 103 json_object *validation_bits = bitfield_to_ir( 104 header->ValidationBits, 3, CPER_HEADER_VALID_BITFIELD_NAMES); 105 json_object_object_add(header_ir, "validationBits", validation_bits); 106 107 //Total length of the record (including headers) in bytes. 108 json_object_object_add(header_ir, "recordLength", 109 json_object_new_uint64(header->RecordLength)); 110 111 //If a timestamp exists according to validation bits, then add it. 112 if (header->ValidationBits & 0b10) { 113 char timestamp_string[TIMESTAMP_LENGTH]; 114 timestamp_to_string(timestamp_string, &header->TimeStamp); 115 116 json_object_object_add( 117 header_ir, "timestamp", 118 json_object_new_string(timestamp_string)); 119 json_object_object_add( 120 header_ir, "timestampIsPrecise", 121 json_object_new_boolean(header->TimeStamp.Flag)); 122 } 123 124 //If a platform ID exists according to the validation bits, then add it. 125 if (header->ValidationBits & 0b1) { 126 char platform_string[GUID_STRING_LENGTH]; 127 guid_to_string(platform_string, &header->PlatformID); 128 json_object_object_add(header_ir, "platformID", 129 json_object_new_string(platform_string)); 130 } 131 132 //If a partition ID exists according to the validation bits, then add it. 133 if (header->ValidationBits & 0b100) { 134 char partition_string[GUID_STRING_LENGTH]; 135 guid_to_string(partition_string, &header->PartitionID); 136 json_object_object_add( 137 header_ir, "partitionID", 138 json_object_new_string(partition_string)); 139 } 140 141 //Creator ID of the header. 142 char creator_string[GUID_STRING_LENGTH]; 143 guid_to_string(creator_string, &header->CreatorID); 144 json_object_object_add(header_ir, "creatorID", 145 json_object_new_string(creator_string)); 146 147 //Notification type for the header. Some defined types are available. 148 json_object *notification_type = json_object_new_object(); 149 char notification_type_string[GUID_STRING_LENGTH]; 150 guid_to_string(notification_type_string, &header->NotificationType); 151 json_object_object_add( 152 notification_type, "guid", 153 json_object_new_string(notification_type_string)); 154 155 //Add the human readable notification type if possible. 156 char *notification_type_readable = "Unknown"; 157 if (guid_equal(&header->NotificationType, 158 &gEfiEventNotificationTypeCmcGuid)) 159 notification_type_readable = "CMC"; 160 else if (guid_equal(&header->NotificationType, 161 &gEfiEventNotificationTypeCpeGuid)) 162 notification_type_readable = "CPE"; 163 else if (guid_equal(&header->NotificationType, 164 &gEfiEventNotificationTypeMceGuid)) 165 notification_type_readable = "MCE"; 166 else if (guid_equal(&header->NotificationType, 167 &gEfiEventNotificationTypePcieGuid)) 168 notification_type_readable = "PCIe"; 169 else if (guid_equal(&header->NotificationType, 170 &gEfiEventNotificationTypeInitGuid)) 171 notification_type_readable = "INIT"; 172 else if (guid_equal(&header->NotificationType, 173 &gEfiEventNotificationTypeNmiGuid)) 174 notification_type_readable = "NMI"; 175 else if (guid_equal(&header->NotificationType, 176 &gEfiEventNotificationTypeBootGuid)) 177 notification_type_readable = "Boot"; 178 else if (guid_equal(&header->NotificationType, 179 &gEfiEventNotificationTypeDmarGuid)) 180 notification_type_readable = "DMAr"; 181 else if (guid_equal(&header->NotificationType, 182 &gEfiEventNotificationTypeSeaGuid)) 183 notification_type_readable = "SEA"; 184 else if (guid_equal(&header->NotificationType, 185 &gEfiEventNotificationTypeSeiGuid)) 186 notification_type_readable = "SEI"; 187 else if (guid_equal(&header->NotificationType, 188 &gEfiEventNotificationTypePeiGuid)) 189 notification_type_readable = "PEI"; 190 else if (guid_equal(&header->NotificationType, 191 &gEfiEventNotificationTypeCxlGuid)) 192 notification_type_readable = "CXL Component"; 193 json_object_object_add( 194 notification_type, "type", 195 json_object_new_string(notification_type_readable)); 196 json_object_object_add(header_ir, "notificationType", 197 notification_type); 198 199 //The record ID for this record, unique on a given system. 200 json_object_object_add(header_ir, "recordID", 201 json_object_new_uint64(header->RecordID)); 202 203 //Flag for the record, and a human readable form. 204 json_object *flags = integer_to_readable_pair( 205 header->Flags, 206 sizeof(CPER_HEADER_FLAG_TYPES_KEYS) / sizeof(int), 207 CPER_HEADER_FLAG_TYPES_KEYS, CPER_HEADER_FLAG_TYPES_VALUES, 208 "Unknown"); 209 json_object_object_add(header_ir, "flags", flags); 210 211 //Persistence information. Outside the scope of specification, so just a uint32 here. 212 json_object_object_add(header_ir, "persistenceInfo", 213 json_object_new_uint64(header->PersistenceInfo)); 214 return header_ir; 215 } 216 217 //Converts the given EFI section descriptor into JSON IR format. 218 json_object * 219 cper_section_descriptor_to_ir(EFI_ERROR_SECTION_DESCRIPTOR *section_descriptor) 220 { 221 json_object *section_descriptor_ir = json_object_new_object(); 222 223 //The offset of the section from the base of the record header, length. 224 json_object_object_add( 225 section_descriptor_ir, "sectionOffset", 226 json_object_new_uint64(section_descriptor->SectionOffset)); 227 json_object_object_add( 228 section_descriptor_ir, "sectionLength", 229 json_object_new_uint64(section_descriptor->SectionLength)); 230 231 //Revision. 232 json_object_object_add(section_descriptor_ir, "revision", 233 revision_to_ir(section_descriptor->Revision)); 234 235 //Validation bits. 236 json_object *validation_bits = 237 bitfield_to_ir(section_descriptor->SecValidMask, 2, 238 CPER_SECTION_DESCRIPTOR_VALID_BITFIELD_NAMES); 239 json_object_object_add(section_descriptor_ir, "validationBits", 240 validation_bits); 241 242 //Flag bits. 243 json_object *flags = 244 bitfield_to_ir(section_descriptor->SectionFlags, 8, 245 CPER_SECTION_DESCRIPTOR_FLAGS_BITFIELD_NAMES); 246 json_object_object_add(section_descriptor_ir, "flags", flags); 247 248 //Section type (GUID). 249 json_object *section_type = json_object_new_object(); 250 char section_type_string[GUID_STRING_LENGTH]; 251 guid_to_string(section_type_string, §ion_descriptor->SectionType); 252 json_object_object_add(section_type, "data", 253 json_object_new_string(section_type_string)); 254 255 //Readable section type, if possible. 256 const char *section_type_readable = "Unknown"; 257 for (int i = 0; i < section_definitions_len; i++) { 258 if (guid_equal(section_definitions[i].Guid, 259 §ion_descriptor->SectionType)) { 260 section_type_readable = 261 section_definitions[i].ReadableName; 262 break; 263 } 264 } 265 266 json_object_object_add(section_type, "type", 267 json_object_new_string(section_type_readable)); 268 json_object_object_add(section_descriptor_ir, "sectionType", 269 section_type); 270 271 //If validation bits indicate it exists, add FRU ID. 272 if (section_descriptor->SecValidMask & 0b1) { 273 char fru_id_string[GUID_STRING_LENGTH]; 274 guid_to_string(fru_id_string, §ion_descriptor->FruId); 275 json_object_object_add(section_descriptor_ir, "fruID", 276 json_object_new_string(fru_id_string)); 277 } 278 279 //If validation bits indicate it exists, add FRU text. 280 if ((section_descriptor->SecValidMask & 0b10) >> 1) 281 json_object_object_add( 282 section_descriptor_ir, "fruText", 283 json_object_new_string(section_descriptor->FruString)); 284 285 //Section severity. 286 json_object *section_severity = json_object_new_object(); 287 json_object_object_add( 288 section_severity, "code", 289 json_object_new_uint64(section_descriptor->Severity)); 290 json_object_object_add(section_severity, "name", 291 json_object_new_string(severity_to_string( 292 section_descriptor->Severity))); 293 json_object_object_add(section_descriptor_ir, "severity", 294 section_severity); 295 296 return section_descriptor_ir; 297 } 298 299 //Converts the section described by a single given section descriptor. 300 json_object *cper_section_to_ir(FILE *handle, long base_pos, 301 EFI_ERROR_SECTION_DESCRIPTOR *descriptor) 302 { 303 //Save our current position in the stream. 304 long position = ftell(handle); 305 306 //Read section as described by the section descriptor. 307 fseek(handle, base_pos + descriptor->SectionOffset, SEEK_SET); 308 void *section = malloc(descriptor->SectionLength); 309 if (fread(section, descriptor->SectionLength, 1, handle) != 1) { 310 printf("Section read failed: Could not read %d bytes from global offset %d.\n", 311 descriptor->SectionLength, descriptor->SectionOffset); 312 free(section); 313 return NULL; 314 } 315 316 //Seek back to our original position. 317 fseek(handle, position, SEEK_SET); 318 319 //Parse section to IR based on GUID. 320 json_object *result = NULL; 321 int section_converted = 0; 322 for (int i = 0; i < section_definitions_len; i++) { 323 if (guid_equal(section_definitions[i].Guid, 324 &descriptor->SectionType) && 325 section_definitions[i].ToIR != NULL) { 326 result = section_definitions[i].ToIR(section, 327 descriptor); 328 section_converted = 1; 329 break; 330 } 331 } 332 333 //Was it an unknown GUID/failed read? 334 if (!section_converted) { 335 //Output the data as formatted base64. 336 result = json_object_new_object(); 337 char *encoded = b64_encode((unsigned char *)section, 338 descriptor->SectionLength); 339 json_object_object_add(result, "data", 340 json_object_new_string(encoded)); 341 free(encoded); 342 } 343 344 //Free section memory, return result. 345 free(section); 346 return result; 347 } 348 349 //Converts a single CPER section, without a header but with a section descriptor, to JSON. 350 json_object *cper_single_section_to_ir(FILE *cper_section_file) 351 { 352 json_object *ir = json_object_new_object(); 353 354 //Read the current file pointer location as base record position. 355 long base_pos = ftell(cper_section_file); 356 357 //Read the section descriptor out. 358 EFI_ERROR_SECTION_DESCRIPTOR section_descriptor; 359 if (fread(§ion_descriptor, sizeof(EFI_ERROR_SECTION_DESCRIPTOR), 1, 360 cper_section_file) != 1) { 361 printf("Failed to read section descriptor for CPER single section (fread() returned an unexpected value).\n"); 362 return NULL; 363 } 364 365 //Convert the section descriptor to IR. 366 json_object *section_descriptor_ir = 367 cper_section_descriptor_to_ir(§ion_descriptor); 368 json_object_object_add(ir, "sectionDescriptor", section_descriptor_ir); 369 370 //Parse the single section. 371 json_object *section_ir = 372 cper_section_to_ir(cper_section_file, base_pos, §ion_descriptor); 373 json_object_object_add(ir, "section", section_ir); 374 375 return ir; 376 }