1 /*
2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
7 * Linux for s390 port by D.J. Barrow
8 * <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
9 * Copyright (c) 1999-2018 The strace developers.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #include "defs.h"
36 #include <limits.h>
37 #include <fcntl.h>
38 #include <stdarg.h>
39 #ifdef HAVE_SYS_XATTR_H
40 # include <sys/xattr.h>
41 #endif
42 #include <sys/uio.h>
43 #include "xstring.h"
44
45 int
tv_nz(const struct timeval * a)46 tv_nz(const struct timeval *a)
47 {
48 return a->tv_sec || a->tv_usec;
49 }
50
51 int
tv_cmp(const struct timeval * a,const struct timeval * b)52 tv_cmp(const struct timeval *a, const struct timeval *b)
53 {
54 if (a->tv_sec < b->tv_sec
55 || (a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec))
56 return -1;
57 if (a->tv_sec > b->tv_sec
58 || (a->tv_sec == b->tv_sec && a->tv_usec > b->tv_usec))
59 return 1;
60 return 0;
61 }
62
63 double
tv_float(const struct timeval * tv)64 tv_float(const struct timeval *tv)
65 {
66 return tv->tv_sec + tv->tv_usec/1000000.0;
67 }
68
69 void
tv_add(struct timeval * tv,const struct timeval * a,const struct timeval * b)70 tv_add(struct timeval *tv, const struct timeval *a, const struct timeval *b)
71 {
72 tv->tv_sec = a->tv_sec + b->tv_sec;
73 tv->tv_usec = a->tv_usec + b->tv_usec;
74 if (tv->tv_usec >= 1000000) {
75 tv->tv_sec++;
76 tv->tv_usec -= 1000000;
77 }
78 }
79
80 void
tv_sub(struct timeval * tv,const struct timeval * a,const struct timeval * b)81 tv_sub(struct timeval *tv, const struct timeval *a, const struct timeval *b)
82 {
83 tv->tv_sec = a->tv_sec - b->tv_sec;
84 tv->tv_usec = a->tv_usec - b->tv_usec;
85 if (((long) tv->tv_usec) < 0) {
86 tv->tv_sec--;
87 tv->tv_usec += 1000000;
88 }
89 }
90
91 void
tv_div(struct timeval * tv,const struct timeval * a,int n)92 tv_div(struct timeval *tv, const struct timeval *a, int n)
93 {
94 tv->tv_usec = (a->tv_sec % n * 1000000 + a->tv_usec + n / 2) / n;
95 tv->tv_sec = a->tv_sec / n + tv->tv_usec / 1000000;
96 tv->tv_usec %= 1000000;
97 }
98
99 void
tv_mul(struct timeval * tv,const struct timeval * a,int n)100 tv_mul(struct timeval *tv, const struct timeval *a, int n)
101 {
102 tv->tv_usec = a->tv_usec * n;
103 tv->tv_sec = a->tv_sec * n + tv->tv_usec / 1000000;
104 tv->tv_usec %= 1000000;
105 }
106
107 #if !defined HAVE_STPCPY
108 char *
stpcpy(char * dst,const char * src)109 stpcpy(char *dst, const char *src)
110 {
111 while ((*dst = *src++) != '\0')
112 dst++;
113 return dst;
114 }
115 #endif
116
117 /* Find a next bit which is set.
118 * Starts testing at cur_bit.
119 * Returns -1 if no more bits are set.
120 *
121 * We never touch bytes we don't need to.
122 * On big-endian, array is assumed to consist of
123 * current_wordsize wide words: for example, is current_wordsize is 4,
124 * the bytes are walked in 3,2,1,0, 7,6,5,4, 11,10,9,8 ... sequence.
125 * On little-endian machines, word size is immaterial.
126 */
127 int
next_set_bit(const void * bit_array,unsigned cur_bit,unsigned size_bits)128 next_set_bit(const void *bit_array, unsigned cur_bit, unsigned size_bits)
129 {
130 const unsigned endian = 1;
131 int little_endian = *(char *) (void *) &endian;
132
133 const uint8_t *array = bit_array;
134 unsigned pos = cur_bit / 8;
135 unsigned pos_xor_mask = little_endian ? 0 : current_wordsize-1;
136
137 for (;;) {
138 uint8_t bitmask;
139 uint8_t cur_byte;
140
141 if (cur_bit >= size_bits)
142 return -1;
143 cur_byte = array[pos ^ pos_xor_mask];
144 if (cur_byte == 0) {
145 cur_bit = (cur_bit + 8) & (-8);
146 pos++;
147 continue;
148 }
149 bitmask = 1 << (cur_bit & 7);
150 for (;;) {
151 if (cur_byte & bitmask)
152 return cur_bit;
153 cur_bit++;
154 if (cur_bit >= size_bits)
155 return -1;
156 bitmask <<= 1;
157 /* This check *can't be* optimized out: */
158 if (bitmask == 0)
159 break;
160 }
161 pos++;
162 }
163 }
164
165 /*
166 * Fetch 64bit argument at position arg_no and
167 * return the index of the next argument.
168 */
169 int
getllval(struct tcb * tcp,unsigned long long * val,int arg_no)170 getllval(struct tcb *tcp, unsigned long long *val, int arg_no)
171 {
172 #if SIZEOF_KERNEL_LONG_T > 4
173 # ifndef current_klongsize
174 if (current_klongsize < SIZEOF_KERNEL_LONG_T) {
175 # if defined(AARCH64) || defined(POWERPC64)
176 /* Align arg_no to the next even number. */
177 arg_no = (arg_no + 1) & 0xe;
178 # endif /* AARCH64 || POWERPC64 */
179 *val = ULONG_LONG(tcp->u_arg[arg_no], tcp->u_arg[arg_no + 1]);
180 arg_no += 2;
181 } else
182 # endif /* !current_klongsize */
183 {
184 *val = tcp->u_arg[arg_no];
185 arg_no++;
186 }
187 #else /* SIZEOF_KERNEL_LONG_T == 4 */
188 # if defined __ARM_EABI__ \
189 || defined LINUX_MIPSO32 \
190 || defined POWERPC \
191 || defined XTENSA
192 /* Align arg_no to the next even number. */
193 arg_no = (arg_no + 1) & 0xe;
194 # elif defined SH
195 /*
196 * The SH4 ABI does allow long longs in odd-numbered registers, but
197 * does not allow them to be split between registers and memory - and
198 * there are only four argument registers for normal functions. As a
199 * result, pread, for example, takes an extra padding argument before
200 * the offset. This was changed late in the 2.4 series (around 2.4.20).
201 */
202 if (arg_no == 3)
203 arg_no++;
204 # endif /* __ARM_EABI__ || LINUX_MIPSO32 || POWERPC || XTENSA || SH */
205 *val = ULONG_LONG(tcp->u_arg[arg_no], tcp->u_arg[arg_no + 1]);
206 arg_no += 2;
207 #endif
208
209 return arg_no;
210 }
211
212 /*
213 * Print 64bit argument at position arg_no and
214 * return the index of the next argument.
215 */
216 int
printllval(struct tcb * tcp,const char * format,int arg_no)217 printllval(struct tcb *tcp, const char *format, int arg_no)
218 {
219 unsigned long long val = 0;
220
221 arg_no = getllval(tcp, &val, arg_no);
222 tprintf(format, val);
223 return arg_no;
224 }
225
226 void
printaddr(const kernel_ulong_t addr)227 printaddr(const kernel_ulong_t addr)
228 {
229 if (!addr)
230 tprints("NULL");
231 else
232 tprintf("%#" PRI_klx, addr);
233 }
234
235 #define DEF_PRINTNUM(name, type) \
236 bool \
237 printnum_ ## name(struct tcb *const tcp, const kernel_ulong_t addr, \
238 const char *const fmt) \
239 { \
240 type num; \
241 if (umove_or_printaddr(tcp, addr, &num)) \
242 return false; \
243 tprints("["); \
244 tprintf(fmt, num); \
245 tprints("]"); \
246 return true; \
247 }
248
249 #define DEF_PRINTNUM_ADDR(name, type) \
250 bool \
251 printnum_addr_ ## name(struct tcb *tcp, const kernel_ulong_t addr) \
252 { \
253 type num; \
254 if (umove_or_printaddr(tcp, addr, &num)) \
255 return false; \
256 tprints("["); \
257 printaddr(num); \
258 tprints("]"); \
259 return true; \
260 }
261
262 #define DEF_PRINTPAIR(name, type) \
263 bool \
264 printpair_ ## name(struct tcb *const tcp, const kernel_ulong_t addr, \
265 const char *const fmt) \
266 { \
267 type pair[2]; \
268 if (umove_or_printaddr(tcp, addr, &pair)) \
269 return false; \
270 tprints("["); \
271 tprintf(fmt, pair[0]); \
272 tprints(", "); \
273 tprintf(fmt, pair[1]); \
274 tprints("]"); \
275 return true; \
276 }
277
DEF_PRINTNUM(int,int)278 DEF_PRINTNUM(int, int)
279 DEF_PRINTNUM_ADDR(int, unsigned int)
280 DEF_PRINTPAIR(int, int)
281 DEF_PRINTNUM(short, short)
282 DEF_PRINTNUM(int64, uint64_t)
283 DEF_PRINTNUM_ADDR(int64, uint64_t)
284 DEF_PRINTPAIR(int64, uint64_t)
285
286 #ifndef current_wordsize
287 bool
288 printnum_long_int(struct tcb *const tcp, const kernel_ulong_t addr,
289 const char *const fmt_long, const char *const fmt_int)
290 {
291 if (current_wordsize > sizeof(int)) {
292 return printnum_int64(tcp, addr, fmt_long);
293 } else {
294 return printnum_int(tcp, addr, fmt_int);
295 }
296 }
297
298 bool
printnum_addr_long_int(struct tcb * tcp,const kernel_ulong_t addr)299 printnum_addr_long_int(struct tcb *tcp, const kernel_ulong_t addr)
300 {
301 if (current_wordsize > sizeof(int)) {
302 return printnum_addr_int64(tcp, addr);
303 } else {
304 return printnum_addr_int(tcp, addr);
305 }
306 }
307 #endif /* !current_wordsize */
308
309 #ifndef current_klongsize
310 bool
printnum_addr_klong_int(struct tcb * tcp,const kernel_ulong_t addr)311 printnum_addr_klong_int(struct tcb *tcp, const kernel_ulong_t addr)
312 {
313 if (current_klongsize > sizeof(int)) {
314 return printnum_addr_int64(tcp, addr);
315 } else {
316 return printnum_addr_int(tcp, addr);
317 }
318 }
319 #endif /* !current_klongsize */
320
321 /**
322 * Prints time to a (static internal) buffer and returns pointer to it.
323 *
324 * @param sec Seconds since epoch.
325 * @param part_sec Amount of second parts since the start of a second.
326 * @param max_part_sec Maximum value of a valid part_sec.
327 * @param width 1 + floor(log10(max_part_sec)).
328 */
329 static const char *
sprinttime_ex(const long long sec,const unsigned long long part_sec,const unsigned int max_part_sec,const int width)330 sprinttime_ex(const long long sec, const unsigned long long part_sec,
331 const unsigned int max_part_sec, const int width)
332 {
333 static char buf[sizeof(int) * 3 * 6 + sizeof(part_sec) * 3
334 + sizeof("+0000")];
335
336 if ((sec == 0 && part_sec == 0) || part_sec > max_part_sec)
337 return NULL;
338
339 time_t t = (time_t) sec;
340 struct tm *tmp = (sec == t) ? localtime(&t) : NULL;
341 if (!tmp)
342 return NULL;
343
344 size_t pos = strftime(buf, sizeof(buf), "%FT%T", tmp);
345 if (!pos)
346 return NULL;
347
348 if (part_sec > 0)
349 pos += xsnprintf(buf + pos, sizeof(buf) - pos, ".%0*llu",
350 width, part_sec);
351
352 return strftime(buf + pos, sizeof(buf) - pos, "%z", tmp) ? buf : NULL;
353 }
354
355 const char *
sprinttime(long long sec)356 sprinttime(long long sec)
357 {
358 return sprinttime_ex(sec, 0, 0, 0);
359 }
360
361 const char *
sprinttime_usec(long long sec,unsigned long long usec)362 sprinttime_usec(long long sec, unsigned long long usec)
363 {
364 return sprinttime_ex(sec, usec, 999999, 6);
365 }
366
367 const char *
sprinttime_nsec(long long sec,unsigned long long nsec)368 sprinttime_nsec(long long sec, unsigned long long nsec)
369 {
370 return sprinttime_ex(sec, nsec, 999999999, 9);
371 }
372
373 enum sock_proto
getfdproto(struct tcb * tcp,int fd)374 getfdproto(struct tcb *tcp, int fd)
375 {
376 #ifdef HAVE_SYS_XATTR_H
377 size_t bufsize = 256;
378 char buf[bufsize];
379 ssize_t r;
380 char path[sizeof("/proc/%u/fd/%u") + 2 * sizeof(int)*3];
381
382 if (fd < 0)
383 return SOCK_PROTO_UNKNOWN;
384
385 xsprintf(path, "/proc/%u/fd/%u", tcp->pid, fd);
386 r = getxattr(path, "system.sockprotoname", buf, bufsize - 1);
387 if (r <= 0)
388 return SOCK_PROTO_UNKNOWN;
389 else {
390 /*
391 * This is a protection for the case when the kernel
392 * side does not append a null byte to the buffer.
393 */
394 buf[r] = '\0';
395
396 return get_proto_by_name(buf);
397 }
398 #else
399 return SOCK_PROTO_UNKNOWN;
400 #endif
401 }
402
403 unsigned long
getfdinode(struct tcb * tcp,int fd)404 getfdinode(struct tcb *tcp, int fd)
405 {
406 char path[PATH_MAX + 1];
407
408 if (getfdpath(tcp, fd, path, sizeof(path)) >= 0) {
409 const char *str = STR_STRIP_PREFIX(path, "socket:[");
410
411 if (str != path) {
412 const size_t str_len = strlen(str);
413 if (str_len && str[str_len - 1] == ']')
414 return strtoul(str, NULL, 10);
415 }
416 }
417
418 return 0;
419 }
420
421 void
printfd(struct tcb * tcp,int fd)422 printfd(struct tcb *tcp, int fd)
423 {
424 char path[PATH_MAX + 1];
425 if (show_fd_path && getfdpath(tcp, fd, path, sizeof(path)) >= 0) {
426 const char *str;
427 size_t len;
428 unsigned long inode;
429
430 tprintf("%d<", fd);
431 if (show_fd_path <= 1
432 || (str = STR_STRIP_PREFIX(path, "socket:[")) == path
433 || !(len = strlen(str))
434 || str[len - 1] != ']'
435 || !(inode = strtoul(str, NULL, 10))
436 || !print_sockaddr_by_inode(tcp, fd, inode)) {
437 print_quoted_string(path, strlen(path),
438 QUOTE_OMIT_LEADING_TRAILING_QUOTES);
439 }
440 tprints(">");
441 } else
442 tprintf("%d", fd);
443 }
444
445 /*
446 * Quote string `instr' of length `size'
447 * Write up to (3 + `size' * 4) bytes to `outstr' buffer.
448 *
449 * If QUOTE_0_TERMINATED `style' flag is set,
450 * treat `instr' as a NUL-terminated string,
451 * checking up to (`size' + 1) bytes of `instr'.
452 *
453 * If QUOTE_OMIT_LEADING_TRAILING_QUOTES `style' flag is set,
454 * do not add leading and trailing quoting symbols.
455 *
456 * Returns 0 if QUOTE_0_TERMINATED is set and NUL was seen, 1 otherwise.
457 * Note that if QUOTE_0_TERMINATED is not set, always returns 1.
458 */
459 int
string_quote(const char * instr,char * outstr,const unsigned int size,const unsigned int style)460 string_quote(const char *instr, char *outstr, const unsigned int size,
461 const unsigned int style)
462 {
463 const unsigned char *ustr = (const unsigned char *) instr;
464 char *s = outstr;
465 unsigned int i;
466 int usehex, c, eol;
467
468 if (style & QUOTE_0_TERMINATED)
469 eol = '\0';
470 else
471 eol = 0x100; /* this can never match a char */
472
473 usehex = 0;
474 if ((xflag > 1) || (style & QUOTE_FORCE_HEX)) {
475 usehex = 1;
476 } else if (xflag) {
477 /* Check for presence of symbol which require
478 to hex-quote the whole string. */
479 for (i = 0; i < size; ++i) {
480 c = ustr[i];
481 /* Check for NUL-terminated string. */
482 if (c == eol)
483 break;
484
485 /* Force hex unless c is printable or whitespace */
486 if (c > 0x7e) {
487 usehex = 1;
488 break;
489 }
490 /* In ASCII isspace is only these chars: "\t\n\v\f\r".
491 * They happen to have ASCII codes 9,10,11,12,13.
492 */
493 if (c < ' ' && (unsigned)(c - 9) >= 5) {
494 usehex = 1;
495 break;
496 }
497 }
498 }
499
500 if (style & QUOTE_EMIT_COMMENT)
501 s = stpcpy(s, " /* ");
502 if (!(style & QUOTE_OMIT_LEADING_TRAILING_QUOTES))
503 *s++ = '\"';
504
505 if (usehex) {
506 /* Hex-quote the whole string. */
507 for (i = 0; i < size; ++i) {
508 c = ustr[i];
509 /* Check for NUL-terminated string. */
510 if (c == eol)
511 goto asciz_ended;
512 *s++ = '\\';
513 *s++ = 'x';
514 *s++ = "0123456789abcdef"[c >> 4];
515 *s++ = "0123456789abcdef"[c & 0xf];
516 }
517 } else {
518 for (i = 0; i < size; ++i) {
519 c = ustr[i];
520 /* Check for NUL-terminated string. */
521 if (c == eol)
522 goto asciz_ended;
523 if ((i == (size - 1)) &&
524 (style & QUOTE_OMIT_TRAILING_0) && (c == '\0'))
525 goto asciz_ended;
526 switch (c) {
527 case '\"': case '\\':
528 *s++ = '\\';
529 *s++ = c;
530 break;
531 case '\f':
532 *s++ = '\\';
533 *s++ = 'f';
534 break;
535 case '\n':
536 *s++ = '\\';
537 *s++ = 'n';
538 break;
539 case '\r':
540 *s++ = '\\';
541 *s++ = 'r';
542 break;
543 case '\t':
544 *s++ = '\\';
545 *s++ = 't';
546 break;
547 case '\v':
548 *s++ = '\\';
549 *s++ = 'v';
550 break;
551 default:
552 if (c >= ' ' && c <= 0x7e)
553 *s++ = c;
554 else {
555 /* Print \octal */
556 *s++ = '\\';
557 if (i + 1 < size
558 && ustr[i + 1] >= '0'
559 && ustr[i + 1] <= '9'
560 ) {
561 /* Print \ooo */
562 *s++ = '0' + (c >> 6);
563 *s++ = '0' + ((c >> 3) & 0x7);
564 } else {
565 /* Print \[[o]o]o */
566 if ((c >> 3) != 0) {
567 if ((c >> 6) != 0)
568 *s++ = '0' + (c >> 6);
569 *s++ = '0' + ((c >> 3) & 0x7);
570 }
571 }
572 *s++ = '0' + (c & 0x7);
573 }
574 break;
575 }
576 }
577 }
578
579 if (!(style & QUOTE_OMIT_LEADING_TRAILING_QUOTES))
580 *s++ = '\"';
581 if (style & QUOTE_EMIT_COMMENT)
582 s = stpcpy(s, " */");
583 *s = '\0';
584
585 /* Return zero if we printed entire ASCIZ string (didn't truncate it) */
586 if (style & QUOTE_0_TERMINATED && ustr[i] == '\0') {
587 /* We didn't see NUL yet (otherwise we'd jump to 'asciz_ended')
588 * but next char is NUL.
589 */
590 return 0;
591 }
592
593 return 1;
594
595 asciz_ended:
596 if (!(style & QUOTE_OMIT_LEADING_TRAILING_QUOTES))
597 *s++ = '\"';
598 if (style & QUOTE_EMIT_COMMENT)
599 s = stpcpy(s, " */");
600 *s = '\0';
601 /* Return zero: we printed entire ASCIZ string (didn't truncate it) */
602 return 0;
603 }
604
605 #ifndef ALLOCA_CUTOFF
606 # define ALLOCA_CUTOFF 4032
607 #endif
608 #define use_alloca(n) ((n) <= ALLOCA_CUTOFF)
609
610 /*
611 * Quote string `str' of length `size' and print the result.
612 *
613 * If QUOTE_0_TERMINATED `style' flag is set,
614 * treat `str' as a NUL-terminated string and
615 * quote at most (`size' - 1) bytes.
616 *
617 * If QUOTE_OMIT_LEADING_TRAILING_QUOTES `style' flag is set,
618 * do not add leading and trailing quoting symbols.
619 *
620 * Returns 0 if QUOTE_0_TERMINATED is set and NUL was seen, 1 otherwise.
621 * Note that if QUOTE_0_TERMINATED is not set, always returns 1.
622 */
623 int
print_quoted_string(const char * str,unsigned int size,const unsigned int style)624 print_quoted_string(const char *str, unsigned int size,
625 const unsigned int style)
626 {
627 char *buf;
628 char *outstr;
629 unsigned int alloc_size;
630 int rc;
631
632 if (size && style & QUOTE_0_TERMINATED)
633 --size;
634
635 alloc_size = 4 * size;
636 if (alloc_size / 4 != size) {
637 error_msg("Out of memory");
638 tprints("???");
639 return -1;
640 }
641 alloc_size += 1 + (style & QUOTE_OMIT_LEADING_TRAILING_QUOTES ? 0 : 2) +
642 (style & QUOTE_EMIT_COMMENT ? 7 : 0);
643
644 if (use_alloca(alloc_size)) {
645 outstr = alloca(alloc_size);
646 buf = NULL;
647 } else {
648 outstr = buf = malloc(alloc_size);
649 if (!buf) {
650 error_msg("Out of memory");
651 tprints("???");
652 return -1;
653 }
654 }
655
656 rc = string_quote(str, outstr, size, style);
657 tprints(outstr);
658
659 free(buf);
660 return rc;
661 }
662
663 /*
664 * Quote a NUL-terminated string `str' of length up to `size' - 1
665 * and print the result.
666 *
667 * Returns 0 if NUL was seen, 1 otherwise.
668 */
669 int
print_quoted_cstring(const char * str,unsigned int size)670 print_quoted_cstring(const char *str, unsigned int size)
671 {
672 int unterminated =
673 print_quoted_string(str, size, QUOTE_0_TERMINATED);
674
675 if (unterminated)
676 tprints("...");
677
678 return unterminated;
679 }
680
681 /*
682 * Print path string specified by address `addr' and length `n'.
683 * If path length exceeds `n', append `...' to the output.
684 *
685 * Returns the result of umovenstr.
686 */
687 int
printpathn(struct tcb * const tcp,const kernel_ulong_t addr,unsigned int n)688 printpathn(struct tcb *const tcp, const kernel_ulong_t addr, unsigned int n)
689 {
690 char path[PATH_MAX];
691 int nul_seen;
692
693 if (!addr) {
694 tprints("NULL");
695 return -1;
696 }
697
698 /* Cap path length to the path buffer size */
699 if (n > sizeof(path) - 1)
700 n = sizeof(path) - 1;
701
702 /* Fetch one byte more to find out whether path length > n. */
703 nul_seen = umovestr(tcp, addr, n + 1, path);
704 if (nul_seen < 0)
705 printaddr(addr);
706 else {
707 path[n++] = !nul_seen;
708 print_quoted_cstring(path, n);
709 }
710
711 return nul_seen;
712 }
713
714 int
printpath(struct tcb * const tcp,const kernel_ulong_t addr)715 printpath(struct tcb *const tcp, const kernel_ulong_t addr)
716 {
717 /* Size must correspond to char path[] size in printpathn */
718 return printpathn(tcp, addr, PATH_MAX - 1);
719 }
720
721 /*
722 * Print string specified by address `addr' and length `len'.
723 * If `user_style' has QUOTE_0_TERMINATED bit set, treat the string
724 * as a NUL-terminated string.
725 * Pass `user_style' on to `string_quote'.
726 * Append `...' to the output if either the string length exceeds `max_strlen',
727 * or QUOTE_0_TERMINATED bit is set and the string length exceeds `len'.
728 *
729 * Returns the result of umovenstr if style has QUOTE_0_TERMINATED,
730 * or the result of umoven otherwise.
731 */
732 int
printstr_ex(struct tcb * const tcp,const kernel_ulong_t addr,const kernel_ulong_t len,const unsigned int user_style)733 printstr_ex(struct tcb *const tcp, const kernel_ulong_t addr,
734 const kernel_ulong_t len, const unsigned int user_style)
735 {
736 static char *str;
737 static char *outstr;
738
739 unsigned int size;
740 unsigned int style = user_style;
741 int rc;
742 int ellipsis;
743
744 if (!addr) {
745 tprints("NULL");
746 return -1;
747 }
748 /* Allocate static buffers if they are not allocated yet. */
749 if (!str) {
750 const unsigned int outstr_size =
751 4 * max_strlen + /* for quotes and NUL */ 3;
752 /*
753 * We can assume that outstr_size / 4 == max_strlen
754 * since we have a guarantee that max_strlen <= -1U / 4.
755 */
756
757 str = xmalloc(max_strlen + 1);
758 outstr = xmalloc(outstr_size);
759 }
760
761 /* Fetch one byte more because string_quote may look one byte ahead. */
762 size = max_strlen + 1;
763
764 if (size > len)
765 size = len;
766 if (style & QUOTE_0_TERMINATED)
767 rc = umovestr(tcp, addr, size, str);
768 else
769 rc = umoven(tcp, addr, size, str);
770
771 if (rc < 0) {
772 printaddr(addr);
773 return rc;
774 }
775
776 if (size > max_strlen)
777 size = max_strlen;
778 else
779 str[size] = '\xff';
780
781 /* If string_quote didn't see NUL and (it was supposed to be ASCIZ str
782 * or we were requested to print more than -s NUM chars)...
783 */
784 ellipsis = string_quote(str, outstr, size, style)
785 && len
786 && ((style & QUOTE_0_TERMINATED)
787 || len > max_strlen);
788
789 tprints(outstr);
790 if (ellipsis)
791 tprints("...");
792
793 return rc;
794 }
795
796 void
dumpiov_upto(struct tcb * const tcp,const int len,const kernel_ulong_t addr,kernel_ulong_t data_size)797 dumpiov_upto(struct tcb *const tcp, const int len, const kernel_ulong_t addr,
798 kernel_ulong_t data_size)
799 {
800 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
801 union {
802 struct { uint32_t base; uint32_t len; } *iov32;
803 struct { uint64_t base; uint64_t len; } *iov64;
804 } iovu;
805 #define iov iovu.iov64
806 #define sizeof_iov \
807 (current_wordsize == 4 ? sizeof(*iovu.iov32) : sizeof(*iovu.iov64))
808 #define iov_iov_base(i) \
809 (current_wordsize == 4 ? (uint64_t) iovu.iov32[i].base : iovu.iov64[i].base)
810 #define iov_iov_len(i) \
811 (current_wordsize == 4 ? (uint64_t) iovu.iov32[i].len : iovu.iov64[i].len)
812 #else
813 struct iovec *iov;
814 #define sizeof_iov sizeof(*iov)
815 #define iov_iov_base(i) ptr_to_kulong(iov[i].iov_base)
816 #define iov_iov_len(i) iov[i].iov_len
817 #endif
818 int i;
819 unsigned size;
820
821 size = sizeof_iov * len;
822 /* Assuming no sane program has millions of iovs */
823 if ((unsigned)len > 1024*1024 /* insane or negative size? */
824 || (iov = malloc(size)) == NULL) {
825 error_msg("Out of memory");
826 return;
827 }
828 if (umoven(tcp, addr, size, iov) >= 0) {
829 for (i = 0; i < len; i++) {
830 kernel_ulong_t iov_len = iov_iov_len(i);
831 if (iov_len > data_size)
832 iov_len = data_size;
833 if (!iov_len)
834 break;
835 data_size -= iov_len;
836 /* include the buffer number to make it easy to
837 * match up the trace with the source */
838 tprintf(" * %" PRI_klu " bytes in buffer %d\n", iov_len, i);
839 dumpstr(tcp, iov_iov_base(i), iov_len);
840 }
841 }
842 free(iov);
843 #undef sizeof_iov
844 #undef iov_iov_base
845 #undef iov_iov_len
846 #undef iov
847 }
848
849 void
dumpstr(struct tcb * const tcp,const kernel_ulong_t addr,const int len)850 dumpstr(struct tcb *const tcp, const kernel_ulong_t addr, const int len)
851 {
852 static int strsize = -1;
853 static unsigned char *str;
854
855 char outbuf[
856 (
857 (sizeof(
858 "xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx "
859 "1234567890123456") + /*in case I'm off by few:*/ 4)
860 /*align to 8 to make memset easier:*/ + 7) & -8
861 ];
862 const unsigned char *src;
863 int i;
864
865 memset(outbuf, ' ', sizeof(outbuf));
866
867 if (strsize < len + 16) {
868 free(str);
869 str = malloc(len + 16);
870 if (!str) {
871 strsize = -1;
872 error_msg("Out of memory");
873 return;
874 }
875 strsize = len + 16;
876 }
877
878 if (umoven(tcp, addr, len, str) < 0)
879 return;
880
881 /* Space-pad to 16 bytes */
882 i = len;
883 while (i & 0xf)
884 str[i++] = ' ';
885
886 i = 0;
887 src = str;
888 while (i < len) {
889 char *dst = outbuf;
890 /* Hex dump */
891 do {
892 if (i < len) {
893 *dst++ = "0123456789abcdef"[*src >> 4];
894 *dst++ = "0123456789abcdef"[*src & 0xf];
895 } else {
896 *dst++ = ' ';
897 *dst++ = ' ';
898 }
899 dst++; /* space is there by memset */
900 i++;
901 if ((i & 7) == 0)
902 dst++; /* space is there by memset */
903 src++;
904 } while (i & 0xf);
905 /* ASCII dump */
906 i -= 16;
907 src -= 16;
908 do {
909 if (*src >= ' ' && *src < 0x7f)
910 *dst++ = *src;
911 else
912 *dst++ = '.';
913 src++;
914 } while (++i & 0xf);
915 *dst = '\0';
916 tprintf(" | %05x %s |\n", i - 16, outbuf);
917 }
918 }
919
920 int
umoven_or_printaddr(struct tcb * const tcp,const kernel_ulong_t addr,const unsigned int len,void * const our_addr)921 umoven_or_printaddr(struct tcb *const tcp, const kernel_ulong_t addr,
922 const unsigned int len, void *const our_addr)
923 {
924 if (!addr || !verbose(tcp) || (exiting(tcp) && syserror(tcp)) ||
925 umoven(tcp, addr, len, our_addr) < 0) {
926 printaddr(addr);
927 return -1;
928 }
929 return 0;
930 }
931
932 int
umoven_or_printaddr_ignore_syserror(struct tcb * const tcp,const kernel_ulong_t addr,const unsigned int len,void * const our_addr)933 umoven_or_printaddr_ignore_syserror(struct tcb *const tcp,
934 const kernel_ulong_t addr,
935 const unsigned int len,
936 void *const our_addr)
937 {
938 if (!addr || !verbose(tcp) || umoven(tcp, addr, len, our_addr) < 0) {
939 printaddr(addr);
940 return -1;
941 }
942 return 0;
943 }
944
945 /*
946 * Iteratively fetch and print up to nmemb elements of elem_size size
947 * from the array that starts at tracee's address start_addr.
948 *
949 * Array elements are being fetched to the address specified by elem_buf.
950 *
951 * The fetcher callback function specified by umoven_func should follow
952 * the same semantics as umoven_or_printaddr function.
953 *
954 * The printer callback function specified by print_func is expected
955 * to print something; if it returns false, no more iterations will be made.
956 *
957 * The pointer specified by opaque_data is passed to each invocation
958 * of print_func callback function.
959 *
960 * This function prints:
961 * - "NULL", if start_addr is NULL;
962 * - "[]", if nmemb is 0;
963 * - start_addr, if nmemb * elem_size overflows or wraps around;
964 * - nothing, if the first element cannot be fetched
965 * (if umoven_func returns non-zero), but it is assumed that
966 * umoven_func has printed the address it failed to fetch data from;
967 * - elements of the array, delimited by ", ", with the array itself
968 * enclosed with [] brackets.
969 *
970 * If abbrev(tcp) is true, then
971 * - the maximum number of elements printed equals to max_strlen;
972 * - "..." is printed instead of max_strlen+1 element
973 * and no more iterations will be made.
974 *
975 * This function returns true only if
976 * - umoven_func has been called at least once AND
977 * - umoven_func has not returned false.
978 */
979 bool
print_array(struct tcb * const tcp,const kernel_ulong_t start_addr,const size_t nmemb,void * const elem_buf,const size_t elem_size,int (* const umoven_func)(struct tcb *,kernel_ulong_t,unsigned int,void *),bool (* const print_func)(struct tcb *,void * elem_buf,size_t elem_size,void * opaque_data),void * const opaque_data)980 print_array(struct tcb *const tcp,
981 const kernel_ulong_t start_addr,
982 const size_t nmemb,
983 void *const elem_buf,
984 const size_t elem_size,
985 int (*const umoven_func)(struct tcb *,
986 kernel_ulong_t,
987 unsigned int,
988 void *),
989 bool (*const print_func)(struct tcb *,
990 void *elem_buf,
991 size_t elem_size,
992 void *opaque_data),
993 void *const opaque_data)
994 {
995 if (!start_addr) {
996 tprints("NULL");
997 return false;
998 }
999
1000 if (!nmemb) {
1001 tprints("[]");
1002 return false;
1003 }
1004
1005 const size_t size = nmemb * elem_size;
1006 const kernel_ulong_t end_addr = start_addr + size;
1007
1008 if (end_addr <= start_addr || size / elem_size != nmemb) {
1009 printaddr(start_addr);
1010 return false;
1011 }
1012
1013 const kernel_ulong_t abbrev_end =
1014 (abbrev(tcp) && max_strlen < nmemb) ?
1015 start_addr + elem_size * max_strlen : end_addr;
1016 kernel_ulong_t cur;
1017
1018 for (cur = start_addr; cur < end_addr; cur += elem_size) {
1019 if (cur != start_addr)
1020 tprints(", ");
1021
1022 if (umoven_func(tcp, cur, elem_size, elem_buf))
1023 break;
1024
1025 if (cur == start_addr)
1026 tprints("[");
1027
1028 if (cur >= abbrev_end) {
1029 tprints("...");
1030 cur = end_addr;
1031 break;
1032 }
1033
1034 if (!print_func(tcp, elem_buf, elem_size, opaque_data)) {
1035 cur = end_addr;
1036 break;
1037 }
1038 }
1039 if (cur != start_addr)
1040 tprints("]");
1041
1042 return cur >= end_addr;
1043 }
1044
1045 int
printargs(struct tcb * tcp)1046 printargs(struct tcb *tcp)
1047 {
1048 const int n = tcp->s_ent->nargs;
1049 int i;
1050 for (i = 0; i < n; ++i)
1051 tprintf("%s%#" PRI_klx, i ? ", " : "", tcp->u_arg[i]);
1052 return RVAL_DECODED;
1053 }
1054
1055 int
printargs_u(struct tcb * tcp)1056 printargs_u(struct tcb *tcp)
1057 {
1058 const int n = tcp->s_ent->nargs;
1059 int i;
1060 for (i = 0; i < n; ++i)
1061 tprintf("%s%u", i ? ", " : "",
1062 (unsigned int) tcp->u_arg[i]);
1063 return RVAL_DECODED;
1064 }
1065
1066 int
printargs_d(struct tcb * tcp)1067 printargs_d(struct tcb *tcp)
1068 {
1069 const int n = tcp->s_ent->nargs;
1070 int i;
1071 for (i = 0; i < n; ++i)
1072 tprintf("%s%d", i ? ", " : "",
1073 (int) tcp->u_arg[i]);
1074 return RVAL_DECODED;
1075 }
1076
1077 /* Print abnormal high bits of a kernel_ulong_t value. */
1078 void
print_abnormal_hi(const kernel_ulong_t val)1079 print_abnormal_hi(const kernel_ulong_t val)
1080 {
1081 if (current_klongsize > 4) {
1082 const unsigned int hi = (unsigned int) ((uint64_t) val >> 32);
1083 if (hi)
1084 tprintf("%#x<<32|", hi);
1085 }
1086 }
1087
1088 #if defined _LARGEFILE64_SOURCE && defined HAVE_OPEN64
1089 # define open_file open64
1090 #else
1091 # define open_file open
1092 #endif
1093
1094 int
read_int_from_file(struct tcb * tcp,const char * const fname,int * const pvalue)1095 read_int_from_file(struct tcb *tcp, const char *const fname, int *const pvalue)
1096 {
1097 const int fd = open_file(fname, O_RDONLY);
1098 if (fd < 0)
1099 return -1;
1100
1101 long lval;
1102 char buf[sizeof(lval) * 3];
1103 int n = read(fd, buf, sizeof(buf) - 1);
1104 int saved_errno = errno;
1105 close(fd);
1106
1107 if (n < 0) {
1108 errno = saved_errno;
1109 return -1;
1110 }
1111
1112 buf[n] = '\0';
1113 char *endptr = 0;
1114 errno = 0;
1115 lval = strtol(buf, &endptr, 10);
1116 if (!endptr || (*endptr && '\n' != *endptr)
1117 #if INT_MAX < LONG_MAX
1118 || lval > INT_MAX || lval < INT_MIN
1119 #endif
1120 || ERANGE == errno) {
1121 if (!errno)
1122 errno = EINVAL;
1123 return -1;
1124 }
1125
1126 *pvalue = (int) lval;
1127 return 0;
1128 }
1129