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1.10 ! jsg 1: /* $OpenBSD: ctfdump.c,v 1.9 2017/10/05 02:59:39 jsg Exp $ */
1.2 jasper 2:
1.1 mpi 3: /*
4: * Copyright (c) 2016 Martin Pieuchot <mpi@openbsd.org>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #include <sys/types.h>
20: #include <sys/stat.h>
21: #include <sys/exec_elf.h>
22: #include <sys/mman.h>
23: #include <sys/ctf.h>
24:
25: #include <err.h>
26: #include <fcntl.h>
27: #include <locale.h>
28: #include <stdio.h>
29: #include <stdint.h>
30: #include <stdlib.h>
31: #include <string.h>
32: #include <unistd.h>
33:
34: #ifdef ZLIB
35: #include <zlib.h>
36: #endif /* ZLIB */
37:
38: #ifndef nitems
39: #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
40: #endif
41:
42: #define DUMP_OBJECT (1 << 0)
43: #define DUMP_FUNCTION (1 << 1)
44: #define DUMP_HEADER (1 << 2)
45: #define DUMP_LABEL (1 << 3)
46: #define DUMP_STRTAB (1 << 4)
47: #define DUMP_STATISTIC (1 << 5)
48: #define DUMP_TYPE (1 << 6)
49:
50: int dump(const char *, uint8_t);
51: int isctf(const char *, size_t);
52: __dead void usage(void);
53:
54: int ctf_dump(const char *, size_t, uint8_t);
55: uint32_t ctf_dump_type(struct ctf_header *, const char *, off_t,
56: uint32_t, uint32_t);
57: const char *ctf_kind2name(uint16_t);
58: const char *ctf_enc2name(uint16_t);
1.7 uwe 59: const char *ctf_fpenc2name(uint16_t);
1.1 mpi 60: const char *ctf_off2name(struct ctf_header *, const char *, off_t,
61: uint32_t);
62:
63: int elf_dump(char *, size_t, uint8_t);
64: const char *elf_idx2sym(size_t *, uint8_t);
65:
66: /* elf.c */
67: int iself(const char *, size_t);
68: int elf_getshstab(const char *, size_t, const char **, size_t *);
1.9 jsg 69: ssize_t elf_getsymtab(const char *, size_t filesize, const char *,
70: size_t, const Elf_Sym **, size_t *);
71: ssize_t elf_getsection(char *, size_t, const char *, const char *,
1.1 mpi 72: size_t, const char **, size_t *);
73:
74: char *decompress(const char *, size_t, off_t);
75:
76: int
77: main(int argc, char *argv[])
78: {
79: const char *filename;
80: uint8_t flags = 0;
81: int ch, error = 0;
1.3 jasper 82:
1.4 jasper 83: setlocale(LC_ALL, "");
84:
1.3 jasper 85: if (pledge("stdio rpath", NULL) == -1)
86: err(1, "pledge");
1.1 mpi 87:
88: while ((ch = getopt(argc, argv, "dfhlst")) != -1) {
89: switch (ch) {
90: case 'd':
91: flags |= DUMP_OBJECT;
92: break;
93: case 'f':
94: flags |= DUMP_FUNCTION;
95: break;
96: case 'h':
97: flags |= DUMP_HEADER;
98: break;
99: case 'l':
100: flags |= DUMP_LABEL;
101: break;
102: case 's':
103: flags |= DUMP_STRTAB;
104: break;
105: case 't':
106: flags |= DUMP_TYPE;
107: break;
108: default:
109: usage();
110: }
111: }
112:
113: argc -= optind;
114: argv += optind;
115:
116: if (argc <= 0)
117: usage();
118:
119: /* Dump everything by default */
120: if (flags == 0)
121: flags = 0xff;
122:
123: while ((filename = *argv++) != NULL)
124: error |= dump(filename, flags);
125:
126: return error;
127: }
128:
129: int
130: dump(const char *path, uint8_t flags)
131: {
132: struct stat st;
133: int fd, error = 1;
134: char *p;
135:
136: fd = open(path, O_RDONLY);
137: if (fd == -1) {
138: warn("open");
139: return 1;
140: }
141: if (fstat(fd, &st) == -1) {
142: warn("fstat");
1.6 jsg 143: close(fd);
1.1 mpi 144: return 1;
145: }
146: if ((uintmax_t)st.st_size > SIZE_MAX) {
147: warnx("file too big to fit memory");
1.6 jsg 148: close(fd);
1.1 mpi 149: return 1;
150: }
151:
152: p = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
153: if (p == MAP_FAILED)
154: err(1, "mmap");
155:
156: if (iself(p, st.st_size)) {
157: error = elf_dump(p, st.st_size, flags);
158: } else if (isctf(p, st.st_size)) {
159: error = ctf_dump(p, st.st_size, flags);
160: }
161:
162: munmap(p, st.st_size);
163: close(fd);
164:
165: return error;
166: }
167:
168: const char *strtab;
169: const Elf_Sym *symtab;
170: size_t strtabsz, nsymb;
171:
172: const char *
173: elf_idx2sym(size_t *idx, uint8_t type)
174: {
175: const Elf_Sym *st;
176: size_t i;
177:
178: for (i = *idx + 1; i < nsymb; i++) {
179: st = &symtab[i];
180:
181: if (ELF_ST_TYPE(st->st_info) != type)
182: continue;
183:
1.10 ! jsg 184: if (st->st_name >= strtabsz)
! 185: break;
! 186:
1.1 mpi 187: *idx = i;
188: return strtab + st->st_name;
189: }
190:
191: return NULL;
192: }
193:
194: int
195: elf_dump(char *p, size_t filesize, uint8_t flags)
196: {
197: Elf_Ehdr *eh = (Elf_Ehdr *)p;
198: Elf_Shdr *sh;
199: const char *shstab;
200: size_t i, shstabsz;
201:
202: /* Find section header string table location and size. */
203: if (elf_getshstab(p, filesize, &shstab, &shstabsz))
204: return 1;
205:
206: /* Find symbol table location and number of symbols. */
1.9 jsg 207: if (elf_getsymtab(p, filesize, shstab, shstabsz, &symtab, &nsymb) == -1)
1.1 mpi 208: warnx("symbol table not found");
209:
210: /* Find string table location and size. */
1.9 jsg 211: if (elf_getsection(p, filesize, ELF_STRTAB, shstab, shstabsz, &strtab,
1.1 mpi 212: &strtabsz) == -1)
213: warnx("string table not found");
214:
215: /* Find CTF section and dump it. */
216: for (i = 0; i < eh->e_shnum; i++) {
217: sh = (Elf_Shdr *)(p + eh->e_shoff + i * eh->e_shentsize);
218:
219: if ((sh->sh_link >= eh->e_shnum) ||
220: (sh->sh_name >= shstabsz))
221: continue;
222:
223: if (strncmp(shstab + sh->sh_name, ELF_CTF, strlen(ELF_CTF)))
1.10 ! jsg 224: continue;
! 225:
! 226: if ((sh->sh_offset + sh->sh_size) > filesize)
1.1 mpi 227: continue;
228:
229: if (!isctf(p + sh->sh_offset, sh->sh_size))
230: break;
231:
232: return ctf_dump(p + sh->sh_offset, sh->sh_size, flags);
233: }
234:
235: warnx("%s section not found", ELF_CTF);
236: return 1;
237: }
238:
239: int
240: isctf(const char *p, size_t filesize)
241: {
242: struct ctf_header *cth = (struct ctf_header *)p;
243: off_t dlen;
244:
245: if (filesize < sizeof(struct ctf_header)) {
246: warnx("file too small to be CTF");
247: return 0;
248: }
249:
250: if (cth->cth_magic != CTF_MAGIC || cth->cth_version != CTF_VERSION)
251: return 0;
252:
253: dlen = cth->cth_stroff + cth->cth_strlen;
254: if (dlen > (off_t)filesize && !(cth->cth_flags & CTF_F_COMPRESS)) {
255: warnx("bogus file size");
256: return 0;
257: }
258:
259: if ((cth->cth_lbloff & 3) || (cth->cth_objtoff & 1) ||
260: (cth->cth_funcoff & 1) || (cth->cth_typeoff & 3)) {
261: warnx("wrongly aligned offset");
262: return 0;
263: }
264:
265: if ((cth->cth_lbloff >= dlen) || (cth->cth_objtoff >= dlen) ||
266: (cth->cth_funcoff >= dlen) || (cth->cth_typeoff >= dlen)) {
267: warnx("truncated file");
268: return 0;
269: }
270:
271: if ((cth->cth_lbloff > cth->cth_objtoff) ||
272: (cth->cth_objtoff > cth->cth_funcoff) ||
273: (cth->cth_funcoff > cth->cth_typeoff) ||
274: (cth->cth_typeoff > cth->cth_stroff)) {
275: warnx("corrupted file");
276: return 0;
277: }
278:
279: return 1;
280: }
281:
282: int
283: ctf_dump(const char *p, size_t size, uint8_t flags)
284: {
285: struct ctf_header *cth = (struct ctf_header *)p;
286: off_t dlen = cth->cth_stroff + cth->cth_strlen;
287: char *data;
288:
289: if (cth->cth_flags & CTF_F_COMPRESS) {
290: data = decompress(p + sizeof(*cth), size - sizeof(*cth), dlen);
291: if (data == NULL)
292: return 1;
293: } else {
294: data = (char *)p + sizeof(*cth);
295: }
296:
297: if (flags & DUMP_HEADER) {
298: printf(" cth_magic = 0x%04x\n", cth->cth_magic);
299: printf(" cth_version = %d\n", cth->cth_version);
300: printf(" cth_flags = 0x%02x\n", cth->cth_flags);
301: printf(" cth_parlabel = %s\n",
302: ctf_off2name(cth, data, dlen, cth->cth_parname));
303: printf(" cth_parname = %s\n",
304: ctf_off2name(cth, data, dlen, cth->cth_parname));
305: printf(" cth_lbloff = %d\n", cth->cth_lbloff);
306: printf(" cth_objtoff = %d\n", cth->cth_objtoff);
307: printf(" cth_funcoff = %d\n", cth->cth_funcoff);
308: printf(" cth_typeoff = %d\n", cth->cth_typeoff);
309: printf(" cth_stroff = %d\n", cth->cth_stroff);
310: printf(" cth_strlen = %d\n", cth->cth_strlen);
311: printf("\n");
312: }
313:
314: if (flags & DUMP_LABEL) {
315: uint32_t lbloff = cth->cth_lbloff;
316: struct ctf_lblent *ctl;
317:
318: while (lbloff < cth->cth_objtoff) {
319: ctl = (struct ctf_lblent *)(data + lbloff);
320:
321: printf(" %5u %s\n", ctl->ctl_typeidx,
322: ctf_off2name(cth, data, dlen, ctl->ctl_label));
323:
324: lbloff += sizeof(*ctl);
325: }
326: printf("\n");
327: }
328:
329: if (flags & DUMP_OBJECT) {
330: uint32_t objtoff = cth->cth_objtoff;
331: size_t idx = 0, i = 0;
332: uint16_t *dsp;
333: const char *s;
334: int l;
335:
336: while (objtoff < cth->cth_funcoff) {
337: dsp = (uint16_t *)(data + objtoff);
338:
339: l = printf(" [%zu] %u", i++, *dsp);
340: if ((s = elf_idx2sym(&idx, STT_OBJECT)) != NULL)
341: printf("%*s %s (%zu)\n", (14 - l), "", s, idx);
342: else
343: printf("\n");
344:
345: objtoff += sizeof(*dsp);
346: }
347: printf("\n");
348: }
349:
350: if (flags & DUMP_FUNCTION) {
351: uint16_t *fsp, kind, vlen;
352: size_t idx = 0, i = -1;
353: const char *s;
354: int l;
355:
356: fsp = (uint16_t *)(data + cth->cth_funcoff);
357: while (fsp < (uint16_t *)(data + cth->cth_typeoff)) {
358: kind = CTF_INFO_KIND(*fsp);
359: vlen = CTF_INFO_VLEN(*fsp);
360: s = elf_idx2sym(&idx, STT_FUNC);
361: fsp++;
362: i++;
363:
364: if (kind == CTF_K_UNKNOWN && vlen == 0)
365: continue;
366:
367: l = printf(" [%zu] FUNC ", i);
368: if (s != NULL)
369: printf("(%s)", s);
370: printf(" returns: %u args: (", *fsp++);
371: while (vlen-- > 0)
372: printf("%u%s", *fsp++, (vlen > 0) ? ", " : "");
373: printf(")\n");
374: }
375: printf("\n");
376: }
377:
378: if (flags & DUMP_TYPE) {
379: uint32_t idx = 1, offset = cth->cth_typeoff;
380:
381: while (offset < cth->cth_stroff) {
382: offset += ctf_dump_type(cth, data, dlen, offset, idx++);
383: }
384: printf("\n");
385: }
386:
387: if (flags & DUMP_STRTAB) {
388: uint32_t offset = 0;
389: const char *str;
390:
391: while (offset < cth->cth_strlen) {
392: str = ctf_off2name(cth, data, dlen, offset);
393:
394: printf(" [%u] ", offset);
395: if (strcmp(str, "(anon)"))
396: offset += printf("%s\n", str);
397: else {
398: printf("\\0\n");
399: offset++;
400: }
401: }
402: printf("\n");
403: }
404:
405: if (cth->cth_flags & CTF_F_COMPRESS)
406: free(data);
407:
408: return 0;
409: }
410:
411: uint32_t
412: ctf_dump_type(struct ctf_header *cth, const char *data, off_t dlen,
413: uint32_t offset, uint32_t idx)
414: {
415: const char *p = data + offset;
416: const struct ctf_type *ctt = (struct ctf_type *)p;
417: const struct ctf_array *cta;
418: uint16_t *argp, i, kind, vlen, root;
419: uint32_t eob, toff;
420: uint64_t size;
421: const char *name, *kname;
422:
423: kind = CTF_INFO_KIND(ctt->ctt_info);
424: vlen = CTF_INFO_VLEN(ctt->ctt_info);
425: root = CTF_INFO_ISROOT(ctt->ctt_info);
426: name = ctf_off2name(cth, data, dlen, ctt->ctt_name);
427:
428: if (root)
429: printf(" <%u> ", idx);
430: else
431: printf(" [%u] ", idx);
432:
433: if ((kname = ctf_kind2name(kind)) != NULL)
434: printf("%s %s", kname, name);
435:
436: if (ctt->ctt_size <= CTF_MAX_SIZE) {
437: size = ctt->ctt_size;
438: toff = sizeof(struct ctf_stype);
439: } else {
440: size = CTF_TYPE_LSIZE(ctt);
441: toff = sizeof(struct ctf_type);
442: }
443:
444: switch (kind) {
445: case CTF_K_UNKNOWN:
446: case CTF_K_FORWARD:
447: break;
448: case CTF_K_INTEGER:
449: eob = *((uint32_t *)(p + toff));
450: toff += sizeof(uint32_t);
451: printf(" encoding=%s offset=%u bits=%u",
452: ctf_enc2name(CTF_INT_ENCODING(eob)), CTF_INT_OFFSET(eob),
453: CTF_INT_BITS(eob));
454: break;
455: case CTF_K_FLOAT:
456: eob = *((uint32_t *)(p + toff));
457: toff += sizeof(uint32_t);
1.7 uwe 458: printf(" encoding=%s offset=%u bits=%u",
459: ctf_fpenc2name(CTF_FP_ENCODING(eob)), CTF_FP_OFFSET(eob),
460: CTF_FP_BITS(eob));
1.1 mpi 461: break;
462: case CTF_K_ARRAY:
463: cta = (struct ctf_array *)(p + toff);
464: printf(" content: %u index: %u nelems: %u\n", cta->cta_contents,
465: cta->cta_index, cta->cta_nelems);
466: toff += sizeof(struct ctf_array);
467: break;
468: case CTF_K_FUNCTION:
469: argp = (uint16_t *)(p + toff);
470: printf(" returns: %u args: (%u", ctt->ctt_type, *argp);
471: for (i = 1; i < vlen; i++) {
472: argp++;
473: printf(", %u", *argp);
474: }
475: printf(")");
476: toff += (vlen + (vlen & 1)) * sizeof(uint16_t);
477: break;
478: case CTF_K_STRUCT:
479: case CTF_K_UNION:
480: printf(" (%llu bytes)\n", size);
481:
482: if (size < CTF_LSTRUCT_THRESH) {
483: for (i = 0; i < vlen; i++) {
484: struct ctf_member *ctm;
485:
486: ctm = (struct ctf_member *)(p + toff);
487: toff += sizeof(struct ctf_member);
488:
489: printf("\t%s type=%u off=%u\n",
490: ctf_off2name(cth, data, dlen,
491: ctm->ctm_name),
492: ctm->ctm_type, ctm->ctm_offset);
493: }
494: } else {
495: for (i = 0; i < vlen; i++) {
496: struct ctf_lmember *ctlm;
497:
498: ctlm = (struct ctf_lmember *)(p + toff);
499: toff += sizeof(struct ctf_lmember);
500:
501: printf("\t%s type=%u off=%llu\n",
502: ctf_off2name(cth, data, dlen,
503: ctlm->ctlm_name),
504: ctlm->ctlm_type, CTF_LMEM_OFFSET(ctlm));
505: }
506: }
507: break;
508: case CTF_K_ENUM:
509: printf("\n");
510: for (i = 0; i < vlen; i++) {
511: struct ctf_enum *cte;
512:
513: cte = (struct ctf_enum *)(p + toff);
514: toff += sizeof(struct ctf_enum);
515:
516: printf("\t%s = %d\n",
517: ctf_off2name(cth, data, dlen, cte->cte_name),
518: cte->cte_value);
519: }
520: break;
521: case CTF_K_POINTER:
522: case CTF_K_TYPEDEF:
523: case CTF_K_VOLATILE:
524: case CTF_K_CONST:
525: case CTF_K_RESTRICT:
526: printf(" refers to %u", ctt->ctt_type);
527: break;
528: default:
529: errx(1, "incorrect type %u at offset %u", kind, offset);
530: }
531:
532: printf("\n");
533:
534: return toff;
535: }
536:
537: const char *
538: ctf_kind2name(uint16_t kind)
539: {
540: static const char *kind_name[] = { NULL, "INTEGER", "FLOAT", "POINTER",
541: "ARRAY", "FUNCTION", "STRUCT", "UNION", "ENUM", "FORWARD",
542: "TYPEDEF", "VOLATILE", "CONST", "RESTRICT" };
543:
544: if (kind >= nitems(kind_name))
545: return NULL;
546:
547: return kind_name[kind];
548: }
549:
550: const char *
551: ctf_enc2name(uint16_t enc)
552: {
553: static const char *enc_name[] = { "SIGNED", "CHAR", "SIGNED CHAR",
554: "BOOL", "SIGNED BOOL" };
555: static char invalid[7];
556:
557: if (enc == CTF_INT_VARARGS)
558: return "VARARGS";
559:
1.8 uwe 560: if (enc > 0 && enc <= nitems(enc_name))
1.7 uwe 561: return enc_name[enc - 1];
562:
563: snprintf(invalid, sizeof(invalid), "0x%x", enc);
564: return invalid;
565: }
566:
567: const char *
568: ctf_fpenc2name(uint16_t enc)
569: {
570: static const char *enc_name[] = { "SINGLE", "DOUBLE", NULL, NULL,
571: NULL, "LDOUBLE" };
572: static char invalid[7];
573:
574: if (enc > 0 && enc <= nitems(enc_name) && enc_name[enc - 1] != NULL)
1.1 mpi 575: return enc_name[enc - 1];
576:
577: snprintf(invalid, sizeof(invalid), "0x%x", enc);
578: return invalid;
579: }
580:
581: const char *
582: ctf_off2name(struct ctf_header *cth, const char *data, off_t dlen,
583: uint32_t offset)
584: {
585: const char *name;
586:
587: if (CTF_NAME_STID(offset) != CTF_STRTAB_0)
588: return "external";
589:
590: if (CTF_NAME_OFFSET(offset) >= cth->cth_strlen)
591: return "exceeds strlab";
592:
593: if (cth->cth_stroff + CTF_NAME_OFFSET(offset) >= dlen)
594: return "invalid";
595:
596: name = data + cth->cth_stroff + CTF_NAME_OFFSET(offset);
597: if (*name == '\0')
598: return "(anon)";
599:
600: return name;
601: }
602:
603: char *
604: decompress(const char *buf, size_t size, off_t len)
605: {
606: #ifdef ZLIB
607: z_stream stream;
608: char *data;
609: int error;
610:
611: data = malloc(len);
612: if (data == NULL) {
613: warn(NULL);
614: return NULL;
615: }
616:
617: memset(&stream, 0, sizeof(stream));
618: stream.next_in = (void *)buf;
619: stream.avail_in = size;
620: stream.next_out = (uint8_t *)data;
621: stream.avail_out = len;
622:
623: if ((error = inflateInit(&stream)) != Z_OK) {
624: warnx("zlib inflateInit failed: %s", zError(error));
625: goto exit;
626: }
627:
628: if ((error = inflate(&stream, Z_FINISH)) != Z_STREAM_END) {
629: warnx("zlib inflate failed: %s", zError(error));
630: inflateEnd(&stream);
631: goto exit;
632: }
633:
634: if ((error = inflateEnd(&stream)) != Z_OK) {
635: warnx("zlib inflateEnd failed: %s", zError(error));
636: goto exit;
637: }
638:
639: if (stream.total_out != len) {
640: warnx("decompression failed: %llu != %llu",
641: stream.total_out, len);
642: goto exit;
643: }
644:
645: return data;
646:
647: exit:
648: free(data);
649: #endif /* ZLIB */
650: return NULL;
651: }
652:
653: __dead void
654: usage(void)
655: {
656: fprintf(stderr, "usage: %s [-dfhlst] file ...\n",
657: getprogname());
658: exit(1);
659: }