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 <string.h>
10 #include <json.h>
11 #include "base64.h"
12 #include "Cper.h"
13 #include "cper-parse.h"
14 #include "cper-parse-str.h"
15 #include "cper-utils.h"
16 #include "sections/cper-section.h"
17
18 //Private pre-definitions.
19 json_object *cper_header_to_ir(EFI_COMMON_ERROR_RECORD_HEADER *header);
20 json_object *
21 cper_section_descriptor_to_ir(EFI_ERROR_SECTION_DESCRIPTOR *section_descriptor);
22 json_object *cper_section_to_ir(FILE *handle, long base_pos,
23 EFI_ERROR_SECTION_DESCRIPTOR *descriptor);
24
25 //Reads a CPER log file at the given file location, and returns an intermediate
26 //JSON representation of this CPER record.
cper_to_ir(FILE * cper_file)27 json_object *cper_to_ir(FILE *cper_file)
28 {
29 //Read the current file pointer location as the base of the record.
30 long base_pos = ftell(cper_file);
31
32 //Ensure this is really a CPER log.
33 EFI_COMMON_ERROR_RECORD_HEADER header;
34 if (fread(&header, sizeof(EFI_COMMON_ERROR_RECORD_HEADER), 1,
35 cper_file) != 1) {
36 printf("Invalid CPER file: Invalid length (log too short).\n");
37 return NULL;
38 }
39
40 //Check if the header contains the magic bytes ("CPER").
41 if (header.SignatureStart != EFI_ERROR_RECORD_SIGNATURE_START) {
42 printf("Invalid CPER file: Invalid header (incorrect signature).\n");
43 return NULL;
44 }
45
46 //Create the header JSON object from the read bytes.
47 json_object *header_ir = cper_header_to_ir(&header);
48
49 //Read the appropriate number of section descriptors & sections, and convert them into IR format.
50 json_object *section_descriptors_ir = json_object_new_array();
51 json_object *sections_ir = json_object_new_array();
52 for (int i = 0; i < header.SectionCount; i++) {
53 //Create the section descriptor.
54 EFI_ERROR_SECTION_DESCRIPTOR section_descriptor;
55 if (fread(§ion_descriptor,
56 sizeof(EFI_ERROR_SECTION_DESCRIPTOR), 1,
57 cper_file) != 1) {
58 printf("Invalid number of section headers: Header states %d sections, could not read section %d.\n",
59 header.SectionCount, i + 1);
60 // Free json objects
61 json_object_put(sections_ir);
62 json_object_put(section_descriptors_ir);
63 json_object_put(header_ir);
64 return NULL;
65 }
66 json_object_array_add(
67 section_descriptors_ir,
68 cper_section_descriptor_to_ir(§ion_descriptor));
69
70 //Read the section itself.
71 json_object_array_add(sections_ir,
72 cper_section_to_ir(cper_file, base_pos,
73 §ion_descriptor));
74 }
75
76 //Add the header, section descriptors, and sections to a parent object.
77 json_object *parent = json_object_new_object();
78 json_object_object_add(parent, "header", header_ir);
79 json_object_object_add(parent, "sectionDescriptors",
80 section_descriptors_ir);
81 json_object_object_add(parent, "sections", sections_ir);
82
83 return parent;
84 }
85
cper_to_str_ir(FILE * cper_file)86 char *cper_to_str_ir(FILE *cper_file)
87 {
88 json_object *jobj = cper_to_ir(cper_file);
89 char *str = jobj ? strdup(json_object_to_json_string(jobj)) : NULL;
90
91 json_object_put(jobj);
92 return str;
93 }
94
cperbuf_to_str_ir(const unsigned char * cper,size_t size)95 char *cperbuf_to_str_ir(const unsigned char *cper, size_t size)
96 {
97 FILE *cper_file = fmemopen((void *)cper, size, "r");
98
99 return cper_file ? cper_to_str_ir(cper_file) : NULL;
100 }
101
102 //Converts a parsed CPER record header into intermediate JSON object format.
cper_header_to_ir(EFI_COMMON_ERROR_RECORD_HEADER * header)103 json_object *cper_header_to_ir(EFI_COMMON_ERROR_RECORD_HEADER *header)
104 {
105 json_object *header_ir = json_object_new_object();
106
107 //Revision/version information.
108 json_object_object_add(header_ir, "revision",
109 revision_to_ir(header->Revision));
110
111 //Section count.
112 json_object_object_add(header_ir, "sectionCount",
113 json_object_new_int(header->SectionCount));
114
115 //Error severity (with interpreted string version).
116 json_object *error_severity = json_object_new_object();
117 json_object_object_add(error_severity, "code",
118 json_object_new_uint64(header->ErrorSeverity));
119 json_object_object_add(error_severity, "name",
120 json_object_new_string(severity_to_string(
121 header->ErrorSeverity)));
122 json_object_object_add(header_ir, "severity", error_severity);
123
124 //The validation bits for each section.
125 json_object *validation_bits = bitfield_to_ir(
126 header->ValidationBits, 3, CPER_HEADER_VALID_BITFIELD_NAMES);
127 json_object_object_add(header_ir, "validationBits", validation_bits);
128
129 //Total length of the record (including headers) in bytes.
130 json_object_object_add(header_ir, "recordLength",
131 json_object_new_uint64(header->RecordLength));
132
133 //If a timestamp exists according to validation bits, then add it.
134 if (header->ValidationBits & 0x2) {
135 char timestamp_string[TIMESTAMP_LENGTH];
136 timestamp_to_string(timestamp_string, &header->TimeStamp);
137
138 json_object_object_add(
139 header_ir, "timestamp",
140 json_object_new_string(timestamp_string));
141 json_object_object_add(
142 header_ir, "timestampIsPrecise",
143 json_object_new_boolean(header->TimeStamp.Flag));
144 }
145
146 //If a platform ID exists according to the validation bits, then add it.
147 if (header->ValidationBits & 0x1) {
148 char platform_string[GUID_STRING_LENGTH];
149 guid_to_string(platform_string, &header->PlatformID);
150 json_object_object_add(header_ir, "platformID",
151 json_object_new_string(platform_string));
152 }
153
154 //If a partition ID exists according to the validation bits, then add it.
155 if (header->ValidationBits & 0x4) {
156 char partition_string[GUID_STRING_LENGTH];
157 guid_to_string(partition_string, &header->PartitionID);
158 json_object_object_add(
159 header_ir, "partitionID",
160 json_object_new_string(partition_string));
161 }
162
163 //Creator ID of the header.
164 char creator_string[GUID_STRING_LENGTH];
165 guid_to_string(creator_string, &header->CreatorID);
166 json_object_object_add(header_ir, "creatorID",
167 json_object_new_string(creator_string));
168
169 //Notification type for the header. Some defined types are available.
170 json_object *notification_type = json_object_new_object();
171 char notification_type_string[GUID_STRING_LENGTH];
172 guid_to_string(notification_type_string, &header->NotificationType);
173 json_object_object_add(
174 notification_type, "guid",
175 json_object_new_string(notification_type_string));
176
177 //Add the human readable notification type if possible.
178 char *notification_type_readable = "Unknown";
179 if (guid_equal(&header->NotificationType,
180 &gEfiEventNotificationTypeCmcGuid)) {
181 notification_type_readable = "CMC";
182 } else if (guid_equal(&header->NotificationType,
183 &gEfiEventNotificationTypeCpeGuid)) {
184 notification_type_readable = "CPE";
185 } else if (guid_equal(&header->NotificationType,
186 &gEfiEventNotificationTypeMceGuid)) {
187 notification_type_readable = "MCE";
188 } else if (guid_equal(&header->NotificationType,
189 &gEfiEventNotificationTypePcieGuid)) {
190 notification_type_readable = "PCIe";
191 } else if (guid_equal(&header->NotificationType,
192 &gEfiEventNotificationTypeInitGuid)) {
193 notification_type_readable = "INIT";
194 } else if (guid_equal(&header->NotificationType,
195 &gEfiEventNotificationTypeNmiGuid)) {
196 notification_type_readable = "NMI";
197 } else if (guid_equal(&header->NotificationType,
198 &gEfiEventNotificationTypeBootGuid)) {
199 notification_type_readable = "Boot";
200 } else if (guid_equal(&header->NotificationType,
201 &gEfiEventNotificationTypeDmarGuid)) {
202 notification_type_readable = "DMAr";
203 } else if (guid_equal(&header->NotificationType,
204 &gEfiEventNotificationTypeSeaGuid)) {
205 notification_type_readable = "SEA";
206 } else if (guid_equal(&header->NotificationType,
207 &gEfiEventNotificationTypeSeiGuid)) {
208 notification_type_readable = "SEI";
209 } else if (guid_equal(&header->NotificationType,
210 &gEfiEventNotificationTypePeiGuid)) {
211 notification_type_readable = "PEI";
212 } else if (guid_equal(&header->NotificationType,
213 &gEfiEventNotificationTypeCxlGuid)) {
214 notification_type_readable = "CXL Component";
215 }
216 json_object_object_add(
217 notification_type, "type",
218 json_object_new_string(notification_type_readable));
219 json_object_object_add(header_ir, "notificationType",
220 notification_type);
221
222 //The record ID for this record, unique on a given system.
223 json_object_object_add(header_ir, "recordID",
224 json_object_new_uint64(header->RecordID));
225
226 //Flag for the record, and a human readable form.
227 json_object *flags = integer_to_readable_pair(
228 header->Flags,
229 sizeof(CPER_HEADER_FLAG_TYPES_KEYS) / sizeof(int),
230 CPER_HEADER_FLAG_TYPES_KEYS, CPER_HEADER_FLAG_TYPES_VALUES,
231 "Unknown");
232 json_object_object_add(header_ir, "flags", flags);
233
234 //Persistence information. Outside the scope of specification, so just a uint32 here.
235 json_object_object_add(header_ir, "persistenceInfo",
236 json_object_new_uint64(header->PersistenceInfo));
237 return header_ir;
238 }
239
240 //Converts the given EFI section descriptor into JSON IR format.
241 json_object *
cper_section_descriptor_to_ir(EFI_ERROR_SECTION_DESCRIPTOR * section_descriptor)242 cper_section_descriptor_to_ir(EFI_ERROR_SECTION_DESCRIPTOR *section_descriptor)
243 {
244 json_object *section_descriptor_ir = json_object_new_object();
245
246 //The offset of the section from the base of the record header, length.
247 json_object_object_add(
248 section_descriptor_ir, "sectionOffset",
249 json_object_new_uint64(section_descriptor->SectionOffset));
250 json_object_object_add(
251 section_descriptor_ir, "sectionLength",
252 json_object_new_uint64(section_descriptor->SectionLength));
253
254 //Revision.
255 json_object_object_add(section_descriptor_ir, "revision",
256 revision_to_ir(section_descriptor->Revision));
257
258 //Validation bits.
259 json_object *validation_bits =
260 bitfield_to_ir(section_descriptor->SecValidMask, 2,
261 CPER_SECTION_DESCRIPTOR_VALID_BITFIELD_NAMES);
262 json_object_object_add(section_descriptor_ir, "validationBits",
263 validation_bits);
264
265 //Flag bits.
266 json_object *flags =
267 bitfield_to_ir(section_descriptor->SectionFlags, 8,
268 CPER_SECTION_DESCRIPTOR_FLAGS_BITFIELD_NAMES);
269 json_object_object_add(section_descriptor_ir, "flags", flags);
270
271 //Section type (GUID).
272 json_object *section_type = json_object_new_object();
273 char section_type_string[GUID_STRING_LENGTH];
274 guid_to_string(section_type_string, §ion_descriptor->SectionType);
275 json_object_object_add(section_type, "data",
276 json_object_new_string(section_type_string));
277
278 //Readable section type, if possible.
279 const char *section_type_readable = "Unknown";
280 for (size_t i = 0; i < section_definitions_len; i++) {
281 if (guid_equal(section_definitions[i].Guid,
282 §ion_descriptor->SectionType)) {
283 section_type_readable =
284 section_definitions[i].ReadableName;
285 break;
286 }
287 }
288
289 json_object_object_add(section_type, "type",
290 json_object_new_string(section_type_readable));
291 json_object_object_add(section_descriptor_ir, "sectionType",
292 section_type);
293
294 //If validation bits indicate it exists, add FRU ID.
295 if (section_descriptor->SecValidMask & 0x1) {
296 char fru_id_string[GUID_STRING_LENGTH];
297 guid_to_string(fru_id_string, §ion_descriptor->FruId);
298 json_object_object_add(section_descriptor_ir, "fruID",
299 json_object_new_string(fru_id_string));
300 }
301
302 //If validation bits indicate it exists, add FRU text.
303 if ((section_descriptor->SecValidMask & 0x2) >> 1) {
304 json_object_object_add(
305 section_descriptor_ir, "fruText",
306 json_object_new_string(section_descriptor->FruString));
307 }
308
309 //Section severity.
310 json_object *section_severity = json_object_new_object();
311 json_object_object_add(
312 section_severity, "code",
313 json_object_new_uint64(section_descriptor->Severity));
314 json_object_object_add(section_severity, "name",
315 json_object_new_string(severity_to_string(
316 section_descriptor->Severity)));
317 json_object_object_add(section_descriptor_ir, "severity",
318 section_severity);
319
320 return section_descriptor_ir;
321 }
322
323 //Converts the section described by a single given section descriptor.
cper_section_to_ir(FILE * handle,long base_pos,EFI_ERROR_SECTION_DESCRIPTOR * descriptor)324 json_object *cper_section_to_ir(FILE *handle, long base_pos,
325 EFI_ERROR_SECTION_DESCRIPTOR *descriptor)
326 {
327 //Save our current position in the stream.
328 long position = ftell(handle);
329
330 //Read section as described by the section descriptor.
331 fseek(handle, base_pos + descriptor->SectionOffset, SEEK_SET);
332 void *section = malloc(descriptor->SectionLength);
333 if (fread(section, descriptor->SectionLength, 1, handle) != 1) {
334 printf("Section read failed: Could not read %u bytes from global offset %d.\n",
335 descriptor->SectionLength, descriptor->SectionOffset);
336 free(section);
337 return NULL;
338 }
339
340 //Seek back to our original position.
341 fseek(handle, position, SEEK_SET);
342
343 //Parse section to IR based on GUID.
344 json_object *result = NULL;
345
346 json_object *section_ir = NULL;
347 int section_converted = 0;
348 for (size_t i = 0; i < section_definitions_len; i++) {
349 if (guid_equal(section_definitions[i].Guid,
350 &descriptor->SectionType) &&
351 section_definitions[i].ToIR != NULL) {
352 section_ir = section_definitions[i].ToIR(section);
353
354 result = json_object_new_object();
355 json_object_object_add(result,
356 section_definitions[i].ShortName,
357 section_ir);
358
359 section_converted = 1;
360 break;
361 }
362 }
363
364 //Was it an unknown GUID/failed read?
365 if (!section_converted) {
366 //Output the data as formatted base64.
367 int32_t encoded_len = 0;
368 char *encoded = base64_encode(
369 section, descriptor->SectionLength, &encoded_len);
370 if (encoded == NULL) {
371 printf("Failed to allocate encode output buffer. \n");
372 } else {
373 section_ir = json_object_new_object();
374 json_object_object_add(section_ir, "data",
375 json_object_new_string_len(
376 encoded, encoded_len));
377 free(encoded);
378
379 result = json_object_new_object();
380 json_object_object_add(result, "Unknown", section_ir);
381 }
382 }
383
384 //Free section memory, return result.
385 free(section);
386 return result;
387 }
388
389 //Converts a single CPER section, without a header but with a section descriptor, to JSON.
cper_single_section_to_ir(FILE * cper_section_file)390 json_object *cper_single_section_to_ir(FILE *cper_section_file)
391 {
392 json_object *ir = json_object_new_object();
393
394 //Read the current file pointer location as base record position.
395 long base_pos = ftell(cper_section_file);
396
397 //Read the section descriptor out.
398 EFI_ERROR_SECTION_DESCRIPTOR section_descriptor;
399 if (fread(§ion_descriptor, sizeof(EFI_ERROR_SECTION_DESCRIPTOR), 1,
400 cper_section_file) != 1) {
401 printf("Failed to read section descriptor for CPER single section (fread() returned an unexpected value).\n");
402 return NULL;
403 }
404
405 //Convert the section descriptor to IR.
406 json_object *section_descriptor_ir =
407 cper_section_descriptor_to_ir(§ion_descriptor);
408 json_object_object_add(ir, "sectionDescriptor", section_descriptor_ir);
409
410 //Parse the single section.
411 json_object *section_ir = cper_section_to_ir(
412 cper_section_file, base_pos, §ion_descriptor);
413 json_object_object_add(ir, "section", section_ir);
414
415 return ir;
416 }
417
cper_single_section_to_str_ir(FILE * cper_section_file)418 char *cper_single_section_to_str_ir(FILE *cper_section_file)
419 {
420 json_object *jobj = cper_single_section_to_ir(cper_section_file);
421 char *str = jobj ? strdup(json_object_to_json_string(jobj)) : NULL;
422
423 json_object_put(jobj);
424 return str;
425 }
426
cperbuf_single_section_to_str_ir(const unsigned char * cper_section,size_t size)427 char *cperbuf_single_section_to_str_ir(const unsigned char *cper_section,
428 size_t size)
429 {
430 FILE *cper_section_file = fmemopen((void *)cper_section, size, "r");
431
432 return cper_section_file ?
433 cper_single_section_to_str_ir(cper_section_file) :
434 NULL;
435 }
436