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1e649dff PP |
1 | /* |
2 | * Copyright 2016-2017 - Philippe Proulx <pproulx@efficios.com> | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
5 | * of this software and associated documentation files (the "Software"), to deal | |
6 | * in the Software without restriction, including without limitation the rights | |
7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
8 | * copies of the Software, and to permit persons to whom the Software is | |
9 | * furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice shall be included in | |
12 | * all copies or substantial portions of the Software. | |
13 | */ | |
14 | ||
15 | #include <stdio.h> | |
16 | #include <stdbool.h> | |
17 | #include <stdint.h> | |
18 | #include <stdlib.h> | |
19 | #include <assert.h> | |
3d9990ac PP |
20 | #include <babeltrace/compat/uuid-internal.h> |
21 | #include <babeltrace/compat/memstream-internal.h> | |
1e649dff PP |
22 | #include <babeltrace/ctf-ir/trace.h> |
23 | #include <glib.h> | |
24 | ||
25 | #include "ast.h" | |
26 | #include "decoder.h" | |
27 | #include "scanner.h" | |
28 | ||
29 | #define PRINT_ERR_STREAM mdec->err_stream | |
30 | #define PRINT_PREFIX "metadata-decoder" | |
31 | #include "../print.h" | |
32 | ||
33 | #define TSDL_MAGIC 0x75d11d57 | |
34 | ||
35 | struct ctf_metadata_decoder { | |
36 | struct ctf_visitor_generate_ir *visitor; | |
37 | FILE *err_stream; | |
38 | uint8_t uuid[16]; | |
39 | bool is_uuid_set; | |
40 | int bo; | |
41 | }; | |
42 | ||
43 | struct packet_header { | |
44 | uint32_t magic; | |
45 | uint8_t uuid[16]; | |
46 | uint32_t checksum; | |
47 | uint32_t content_size; | |
48 | uint32_t packet_size; | |
49 | uint8_t compression_scheme; | |
50 | uint8_t encryption_scheme; | |
51 | uint8_t checksum_scheme; | |
52 | uint8_t major; | |
53 | uint8_t minor; | |
54 | } __attribute__((__packed__)); | |
55 | ||
56 | BT_HIDDEN | |
57 | bool ctf_metadata_decoder_is_packetized(FILE *fp, int *byte_order) | |
58 | { | |
59 | uint32_t magic; | |
60 | size_t len; | |
61 | int ret = 0; | |
62 | ||
63 | len = fread(&magic, sizeof(magic), 1, fp); | |
64 | if (len != 1) { | |
65 | goto end; | |
66 | } | |
67 | ||
68 | if (byte_order) { | |
69 | if (magic == TSDL_MAGIC) { | |
70 | ret = 1; | |
71 | *byte_order = BYTE_ORDER; | |
72 | } else if (magic == GUINT32_SWAP_LE_BE(TSDL_MAGIC)) { | |
73 | ret = 1; | |
74 | *byte_order = BYTE_ORDER == BIG_ENDIAN ? | |
75 | LITTLE_ENDIAN : BIG_ENDIAN; | |
76 | } | |
77 | } | |
78 | ||
79 | end: | |
80 | rewind(fp); | |
81 | ||
82 | return ret; | |
83 | } | |
84 | ||
85 | static | |
86 | bool is_version_valid(unsigned int major, unsigned int minor) | |
87 | { | |
88 | return major == 1 && minor == 8; | |
89 | } | |
90 | ||
91 | static | |
92 | int decode_packet(struct ctf_metadata_decoder *mdec, FILE *in_fp, FILE *out_fp, | |
93 | int byte_order) | |
94 | { | |
95 | struct packet_header header; | |
96 | size_t readlen, writelen, toread; | |
97 | uint8_t buf[512 + 1]; /* + 1 for debug-mode \0 */ | |
98 | int ret = 0; | |
99 | ||
100 | readlen = fread(&header, sizeof(header), 1, in_fp); | |
101 | if (feof(in_fp) != 0) { | |
102 | goto end; | |
103 | } | |
104 | if (readlen < 1) { | |
105 | goto error; | |
106 | } | |
107 | ||
108 | if (byte_order != BYTE_ORDER) { | |
109 | header.magic = GUINT32_SWAP_LE_BE(header.magic); | |
110 | header.checksum = GUINT32_SWAP_LE_BE(header.checksum); | |
111 | header.content_size = GUINT32_SWAP_LE_BE(header.content_size); | |
112 | header.packet_size = GUINT32_SWAP_LE_BE(header.packet_size); | |
113 | } | |
114 | ||
115 | if (header.compression_scheme) { | |
116 | PERR("Metadata packet compression not supported yet\n"); | |
117 | goto error; | |
118 | } | |
119 | ||
120 | if (header.encryption_scheme) { | |
121 | PERR("Metadata packet encryption not supported yet\n"); | |
122 | goto error; | |
123 | } | |
124 | ||
125 | if (header.checksum || header.checksum_scheme) { | |
126 | PERR("Metadata packet checksum verification not supported yet\n"); | |
127 | goto error; | |
128 | } | |
129 | ||
130 | if (!is_version_valid(header.major, header.minor)) { | |
131 | PERR("Invalid metadata version: %u.%u\n", header.major, | |
132 | header.minor); | |
133 | goto error; | |
134 | } | |
135 | ||
136 | /* Set expected trace UUID if not set; otherwise validate it */ | |
137 | if (mdec) { | |
138 | if (!mdec->is_uuid_set) { | |
139 | memcpy(mdec->uuid, header.uuid, sizeof(header.uuid)); | |
140 | mdec->is_uuid_set = true; | |
141 | } else if (bt_uuid_compare(header.uuid, mdec->uuid)) { | |
142 | PERR("Metadata UUID mismatch between packets of the same stream\n"); | |
143 | goto error; | |
144 | } | |
145 | } | |
146 | ||
147 | if ((header.content_size / CHAR_BIT) < sizeof(header)) { | |
148 | PERR("Bad metadata packet content size: %u\n", | |
149 | header.content_size); | |
150 | goto error; | |
151 | } | |
152 | ||
153 | toread = header.content_size / CHAR_BIT - sizeof(header); | |
154 | ||
155 | for (;;) { | |
156 | readlen = fread(buf, sizeof(uint8_t), | |
157 | MIN(sizeof(buf) - 1, toread), in_fp); | |
158 | if (ferror(in_fp)) { | |
159 | PERR("Cannot read metadata packet buffer (at position %ld)\n", | |
160 | ftell(in_fp)); | |
161 | goto error; | |
162 | } | |
163 | ||
164 | writelen = fwrite(buf, sizeof(uint8_t), readlen, out_fp); | |
165 | if (writelen < readlen || ferror(out_fp)) { | |
166 | PERR("Cannot write decoded metadata text to buffer\n"); | |
167 | goto error; | |
168 | } | |
169 | ||
170 | toread -= readlen; | |
171 | if (toread == 0) { | |
172 | int fseek_ret; | |
173 | ||
174 | /* Read leftover padding */ | |
175 | toread = (header.packet_size - header.content_size) / | |
176 | CHAR_BIT; | |
177 | fseek_ret = fseek(in_fp, toread, SEEK_CUR); | |
178 | if (fseek_ret < 0) { | |
179 | PWARN("Missing padding at the end of the metadata file\n"); | |
180 | } | |
181 | ||
182 | break; | |
183 | } | |
184 | } | |
185 | ||
186 | goto end; | |
187 | ||
188 | error: | |
189 | ret = -1; | |
190 | ||
191 | end: | |
192 | return ret; | |
193 | } | |
194 | ||
195 | static | |
196 | int ctf_metadata_decoder_packetized_file_stream_to_buf_with_mdec( | |
197 | struct ctf_metadata_decoder *mdec, FILE *fp, | |
198 | char **buf, int byte_order) | |
199 | { | |
200 | FILE *out_fp; | |
201 | size_t size; | |
202 | int ret = 0; | |
203 | int tret; | |
204 | size_t packet_index = 0; | |
205 | ||
206 | out_fp = bt_open_memstream(buf, &size); | |
207 | if (out_fp == NULL) { | |
208 | PERR("Cannot open memory stream: %s\n", strerror(errno)); | |
209 | goto error; | |
210 | } | |
211 | ||
212 | for (;;) { | |
213 | if (feof(fp) != 0) { | |
214 | break; | |
215 | } | |
216 | ||
217 | tret = decode_packet(mdec, fp, out_fp, byte_order); | |
218 | if (tret) { | |
219 | PERR("Cannot decode packet #%zu\n", packet_index); | |
220 | goto error; | |
221 | } | |
222 | ||
223 | packet_index++; | |
224 | } | |
225 | ||
226 | /* Make sure the whole string ends with a null character */ | |
227 | tret = fputc('\0', out_fp); | |
228 | if (tret == EOF) { | |
229 | PERR("Cannot append '\\0' to the decoded metadata buffer\n"); | |
230 | goto error; | |
231 | } | |
232 | ||
233 | /* Close stream, which also flushes the buffer */ | |
234 | ret = bt_close_memstream(buf, &size, out_fp); | |
235 | if (ret < 0) { | |
236 | PERR("Cannot close memory stream: %s\n", strerror(errno)); | |
237 | goto error; | |
238 | } | |
239 | ||
240 | goto end; | |
241 | ||
242 | error: | |
243 | ret = -1; | |
244 | ||
245 | if (out_fp) { | |
246 | bt_close_memstream(buf, &size, out_fp); | |
247 | } | |
248 | ||
249 | if (*buf) { | |
250 | free(*buf); | |
251 | } | |
252 | ||
253 | end: | |
254 | return ret; | |
255 | } | |
256 | ||
257 | BT_HIDDEN | |
258 | int ctf_metadata_decoder_packetized_file_stream_to_buf( | |
259 | FILE *fp, char **buf, int byte_order) | |
260 | { | |
261 | return ctf_metadata_decoder_packetized_file_stream_to_buf_with_mdec( | |
262 | NULL, fp, buf, byte_order); | |
263 | } | |
264 | ||
265 | BT_HIDDEN | |
266 | struct ctf_metadata_decoder *ctf_metadata_decoder_create(FILE *err, | |
267 | uint64_t clock_class_offset_ns) | |
268 | { | |
269 | struct ctf_metadata_decoder *mdec = | |
270 | g_new0(struct ctf_metadata_decoder, 1); | |
271 | ||
272 | if (!mdec) { | |
273 | goto end; | |
274 | } | |
275 | ||
276 | mdec->err_stream = err; | |
277 | mdec->visitor = ctf_visitor_generate_ir_create(err, | |
278 | clock_class_offset_ns); | |
279 | if (!mdec->visitor) { | |
280 | ctf_metadata_decoder_destroy(mdec); | |
281 | mdec = NULL; | |
282 | goto end; | |
283 | } | |
284 | ||
285 | end: | |
286 | return mdec; | |
287 | } | |
288 | ||
289 | BT_HIDDEN | |
290 | void ctf_metadata_decoder_destroy(struct ctf_metadata_decoder *mdec) | |
291 | { | |
292 | if (!mdec) { | |
293 | return; | |
294 | } | |
295 | ||
296 | ctf_visitor_generate_ir_destroy(mdec->visitor); | |
297 | g_free(mdec); | |
298 | } | |
299 | ||
300 | BT_HIDDEN | |
301 | enum ctf_metadata_decoder_status ctf_metadata_decoder_decode( | |
302 | struct ctf_metadata_decoder *mdec, FILE *fp) | |
303 | { | |
304 | enum ctf_metadata_decoder_status status = | |
305 | CTF_METADATA_DECODER_STATUS_OK; | |
306 | int ret; | |
307 | struct ctf_scanner *scanner = NULL; | |
308 | char *buf = NULL; | |
309 | bool close_fp = false; | |
310 | ||
311 | assert(mdec); | |
312 | ||
313 | if (ctf_metadata_decoder_is_packetized(fp, &mdec->bo)) { | |
314 | PDBG("Metadata stream is packetized\n"); | |
315 | ret = ctf_metadata_decoder_packetized_file_stream_to_buf_with_mdec( | |
316 | mdec, fp, &buf, mdec->bo); | |
317 | if (ret) { | |
318 | // log: details | |
319 | status = CTF_METADATA_DECODER_STATUS_ERROR; | |
320 | goto end; | |
321 | } | |
322 | ||
323 | /* Convert the real file pointer to a memory file pointer */ | |
324 | fp = bt_fmemopen(buf, strlen(buf), "rb"); | |
325 | close_fp = true; | |
326 | if (!fp) { | |
327 | PERR("Cannot memory-open metadata buffer: %s\n", | |
328 | strerror(errno)); | |
329 | status = CTF_METADATA_DECODER_STATUS_ERROR; | |
330 | goto end; | |
331 | } | |
332 | } else { | |
333 | unsigned int major, minor; | |
334 | ssize_t nr_items; | |
335 | const long init_pos = ftell(fp); | |
336 | ||
337 | PDBG("Metadata stream is plain text\n"); | |
338 | ||
339 | /* Check text-only metadata header and version */ | |
340 | nr_items = fscanf(fp, "/* CTF %10u.%10u", &major, &minor); | |
341 | if (nr_items < 2) { | |
342 | PWARN("Ill-shapen or missing \"/* CTF major.minor\" header in plain text metadata file stream\n"); | |
343 | } | |
344 | ||
345 | PDBG("Metadata version: %u.%u\n", major, minor); | |
346 | ||
347 | if (!is_version_valid(major, minor)) { | |
348 | PERR("Invalid metadata version: %u.%u\n", major, minor); | |
349 | status = CTF_METADATA_DECODER_STATUS_INVAL_VERSION; | |
350 | goto end; | |
351 | } | |
352 | ||
353 | if (fseek(fp, init_pos, SEEK_SET)) { | |
354 | PERR("Cannot seek metadata file stream to initial position: %s\n", | |
355 | strerror(errno)); | |
356 | status = CTF_METADATA_DECODER_STATUS_ERROR; | |
357 | goto end; | |
358 | } | |
359 | } | |
360 | ||
361 | /* Allocate a scanner and append the metadata text content */ | |
362 | scanner = ctf_scanner_alloc(); | |
363 | if (!scanner) { | |
364 | PERR("Cannot allocate a metadata lexical scanner\n"); | |
365 | status = CTF_METADATA_DECODER_STATUS_ERROR; | |
366 | goto end; | |
367 | } | |
368 | ||
369 | assert(fp); | |
370 | ret = ctf_scanner_append_ast(scanner, fp); | |
371 | if (ret) { | |
372 | PERR("Cannot create the metadata AST\n"); | |
373 | status = CTF_METADATA_DECODER_STATUS_INCOMPLETE; | |
374 | goto end; | |
375 | } | |
376 | ||
377 | ret = ctf_visitor_semantic_check(stderr, 0, &scanner->ast->root); | |
378 | if (ret) { | |
379 | PERR("Metadata semantic validation failed\n"); | |
380 | status = CTF_METADATA_DECODER_STATUS_ERROR; | |
381 | goto end; | |
382 | } | |
383 | ||
384 | ret = ctf_visitor_generate_ir_visit_node(mdec->visitor, | |
385 | &scanner->ast->root); | |
386 | switch (ret) { | |
387 | case 0: | |
388 | /* Success */ | |
389 | break; | |
390 | case -EINCOMPLETE: | |
391 | PDBG("While visiting AST: incomplete data\n"); | |
392 | status = CTF_METADATA_DECODER_STATUS_INCOMPLETE; | |
393 | goto end; | |
394 | default: | |
395 | PERR("Cannot visit AST node to create CTF IR objects\n"); | |
396 | status = CTF_METADATA_DECODER_STATUS_IR_VISITOR_ERROR; | |
397 | goto end; | |
398 | } | |
399 | ||
400 | end: | |
401 | if (scanner) { | |
402 | ctf_scanner_free(scanner); | |
403 | } | |
404 | ||
405 | if (fp && close_fp) { | |
406 | if (fclose(fp)) { | |
407 | PERR("Cannot close metadata file stream\n"); | |
408 | } | |
409 | } | |
410 | ||
411 | if (buf) { | |
412 | free(buf); | |
413 | } | |
414 | ||
415 | return status; | |
416 | } | |
417 | ||
418 | BT_HIDDEN | |
419 | struct bt_ctf_trace *ctf_metadata_decoder_get_trace( | |
420 | struct ctf_metadata_decoder *mdec) | |
421 | { | |
422 | return ctf_visitor_generate_ir_get_trace(mdec->visitor); | |
423 | } |