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 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "defs.h"
32#include <fcntl.h>
33#include <sys/file.h>
34#ifdef HAVE_SYS_EPOLL_H
35# include <sys/epoll.h>
36#endif
37#ifdef HAVE_LINUX_PERF_EVENT_H
38# include  <linux/perf_event.h>
39#endif
40
41#include "xlat/fcntlcmds.h"
42#include "xlat/fdflags.h"
43#include "xlat/flockcmds.h"
44#include "xlat/lockfcmds.h"
45#include "xlat/notifyflags.h"
46#include "xlat/perf_event_open_flags.h"
47
48/*
49 * Assume that F_SETLK64, F_SETLKW64, and F_GETLK64 are either defined
50 * or not defined altogether.
51 */
52#if defined(F_SETLK64) && F_SETLK64 + 0 != F_SETLK
53# define USE_PRINTFLOCK64 1
54#else
55# define USE_PRINTFLOCK64 0
56#endif
57
58#if USE_PRINTFLOCK64
59
60# ifndef HAVE_STRUCT_FLOCK64
61struct flock64 {
62	short int l_type, l_whence;
63	int64_t l_start, l_len;
64	int l_pid;
65};
66# endif
67
68static void
69printflock64(struct tcb *tcp, long addr, int getlk)
70{
71	struct flock64 fl;
72
73	if (umove(tcp, addr, &fl) < 0) {
74		tprints("{...}");
75		return;
76	}
77	tprints("{type=");
78	printxval(lockfcmds, fl.l_type, "F_???");
79	tprints(", whence=");
80	printxval(whence_codes, fl.l_whence, "SEEK_???");
81	tprintf(", start=%lld, len=%lld", (long long) fl.l_start, (long long) fl.l_len);
82	if (getlk)
83		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
84	else
85		tprints("}");
86}
87#endif /* USE_PRINTFLOCK64 */
88
89static void
90printflock(struct tcb *tcp, long addr, int getlk)
91{
92	struct flock fl;
93	int r;
94
95#if SUPPORTED_PERSONALITIES > 1
96	if (
97# if SIZEOF_OFF_T > SIZEOF_LONG
98	    current_personality > 0 &&
99#endif
100	    current_wordsize != sizeof(fl.l_start)) {
101		if (current_wordsize == 4) {
102			/* 32-bit x86 app on x86_64 and similar cases */
103			struct {
104				short int l_type;
105				short int l_whence;
106				int32_t l_start; /* off_t */
107				int32_t l_len; /* off_t */
108				int32_t l_pid; /* pid_t */
109			} fl32;
110			r = umove(tcp, addr, &fl32);
111			if (r >= 0) {
112				fl.l_type = fl32.l_type;
113				fl.l_whence = fl32.l_whence;
114				fl.l_start = fl32.l_start;
115				fl.l_len = fl32.l_len;
116				fl.l_pid = fl32.l_pid;
117			}
118		} else {
119			/* let people know we have a problem here */
120			tprintf("<decode error: unsupported wordsize %d>",
121				current_wordsize);
122			return;
123		}
124	} else
125#endif
126	{
127		r = umove(tcp, addr, &fl);
128	}
129	if (r < 0) {
130		tprints("{...}");
131		return;
132	}
133	tprints("{type=");
134	printxval(lockfcmds, fl.l_type, "F_???");
135	tprints(", whence=");
136	printxval(whence_codes, fl.l_whence, "SEEK_???");
137#if SIZEOF_OFF_T > SIZEOF_LONG
138	tprintf(", start=%lld, len=%lld", fl.l_start, fl.l_len);
139#else
140	tprintf(", start=%ld, len=%ld", fl.l_start, fl.l_len);
141#endif
142	if (getlk)
143		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
144	else
145		tprints("}");
146}
147
148int
149sys_fcntl(struct tcb *tcp)
150{
151	if (entering(tcp)) {
152		printfd(tcp, tcp->u_arg[0]);
153		tprints(", ");
154		printxval(fcntlcmds, tcp->u_arg[1], "F_???");
155		switch (tcp->u_arg[1]) {
156		case F_SETFD:
157			tprints(", ");
158			printflags(fdflags, tcp->u_arg[2], "FD_???");
159			break;
160		case F_SETOWN: case F_DUPFD:
161#ifdef F_DUPFD_CLOEXEC
162		case F_DUPFD_CLOEXEC:
163#endif
164			tprintf(", %ld", tcp->u_arg[2]);
165			break;
166		case F_SETFL:
167			tprints(", ");
168			tprint_open_modes(tcp->u_arg[2]);
169			break;
170		case F_SETLK: case F_SETLKW:
171			tprints(", ");
172			printflock(tcp, tcp->u_arg[2], 0);
173			break;
174#if USE_PRINTFLOCK64
175		case F_SETLK64: case F_SETLKW64:
176			tprints(", ");
177			printflock64(tcp, tcp->u_arg[2], 0);
178			break;
179#endif /* USE_PRINTFLOCK64 */
180#ifdef F_NOTIFY
181		case F_NOTIFY:
182			tprints(", ");
183			printflags(notifyflags, tcp->u_arg[2], "DN_???");
184			break;
185#endif
186#ifdef F_SETLEASE
187		case F_SETLEASE:
188			tprints(", ");
189			printxval(lockfcmds, tcp->u_arg[2], "F_???");
190			break;
191#endif
192		}
193	}
194	else {
195		switch (tcp->u_arg[1]) {
196		case F_DUPFD:
197#ifdef F_DUPFD_CLOEXEC
198		case F_DUPFD_CLOEXEC:
199#endif
200		case F_SETFD: case F_SETFL:
201		case F_SETLK: case F_SETLKW:
202		case F_SETOWN: case F_GETOWN:
203#ifdef F_NOTIFY
204		case F_NOTIFY:
205#endif
206#ifdef F_SETLEASE
207		case F_SETLEASE:
208#endif
209			break;
210		case F_GETFD:
211			if (syserror(tcp) || tcp->u_rval == 0)
212				return 0;
213			tcp->auxstr = sprintflags("flags ", fdflags, tcp->u_rval);
214			return RVAL_HEX|RVAL_STR;
215		case F_GETFL:
216			if (syserror(tcp))
217				return 0;
218			tcp->auxstr = sprint_open_modes(tcp->u_rval);
219			return RVAL_HEX|RVAL_STR;
220		case F_GETLK:
221			tprints(", ");
222			printflock(tcp, tcp->u_arg[2], 1);
223			break;
224#if USE_PRINTFLOCK64
225		case F_GETLK64:
226			tprints(", ");
227			printflock64(tcp, tcp->u_arg[2], 1);
228			break;
229#endif
230#ifdef F_GETLEASE
231		case F_GETLEASE:
232			if (syserror(tcp))
233				return 0;
234			tcp->auxstr = xlookup(lockfcmds, tcp->u_rval);
235			return RVAL_HEX|RVAL_STR;
236#endif
237		default:
238			tprintf(", %#lx", tcp->u_arg[2]);
239			break;
240		}
241	}
242	return 0;
243}
244
245#ifdef LOCK_SH
246
247int
248sys_flock(struct tcb *tcp)
249{
250	if (entering(tcp)) {
251		printfd(tcp, tcp->u_arg[0]);
252		tprints(", ");
253		printflags(flockcmds, tcp->u_arg[1], "LOCK_???");
254	}
255	return 0;
256}
257#endif /* LOCK_SH */
258
259int
260sys_close(struct tcb *tcp)
261{
262	if (entering(tcp)) {
263		printfd(tcp, tcp->u_arg[0]);
264	}
265	return 0;
266}
267
268int
269sys_dup(struct tcb *tcp)
270{
271	if (entering(tcp)) {
272		printfd(tcp, tcp->u_arg[0]);
273	}
274	return RVAL_FD;
275}
276
277static int
278do_dup2(struct tcb *tcp, int flags_arg)
279{
280	if (entering(tcp)) {
281		printfd(tcp, tcp->u_arg[0]);
282		tprints(", ");
283		printfd(tcp, tcp->u_arg[1]);
284		if (flags_arg >= 0) {
285			tprints(", ");
286			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
287		}
288	}
289	return RVAL_FD;
290}
291
292int
293sys_dup2(struct tcb *tcp)
294{
295	return do_dup2(tcp, -1);
296}
297
298int
299sys_dup3(struct tcb *tcp)
300{
301	return do_dup2(tcp, 2);
302}
303
304#if defined(ALPHA)
305int
306sys_getdtablesize(struct tcb *tcp)
307{
308	return 0;
309}
310#endif
311
312static int
313decode_select(struct tcb *tcp, long *args, enum bitness_t bitness)
314{
315	int i, j;
316	int nfds, fdsize;
317	fd_set *fds;
318	const char *sep;
319	long arg;
320
321	/* Kernel truncates arg[0] to int, we do the same. */
322	nfds = (int) args[0];
323
324	/* Kernel rejects negative nfds, so we don't parse it either. */
325	if (nfds < 0) {
326		nfds = 0;
327		fds = NULL;
328	}
329	/* Beware of select(2^31-1, NULL, NULL, NULL) and similar... */
330	if (nfds > 1024*1024)
331		nfds = 1024*1024;
332
333	/*
334	 * We had bugs a-la "while (j < args[0])" and "umoven(args[0])" below.
335	 * Instead of args[0], use nfds for fd count, fdsize for array lengths.
336	 */
337	fdsize = (((nfds + 7) / 8) + current_wordsize-1) & -current_wordsize;
338
339	if (entering(tcp)) {
340		tprintf("%d", (int) args[0]);
341
342		if (fdsize > 0) {
343			fds = malloc(fdsize);
344			if (!fds)
345				die_out_of_memory();
346		}
347		for (i = 0; i < 3; i++) {
348			arg = args[i+1];
349			if (arg == 0) {
350				tprints(", NULL");
351				continue;
352			}
353			if (!verbose(tcp) || !fds) {
354				tprintf(", %#lx", arg);
355				continue;
356			}
357			if (umoven(tcp, arg, fdsize, (char *) fds) < 0) {
358				tprints(", [?]");
359				continue;
360			}
361			tprints(", [");
362			for (j = 0, sep = "";; j++) {
363				j = next_set_bit(fds, j, nfds);
364				if (j < 0)
365					break;
366				tprints(sep);
367				printfd(tcp, j);
368				sep = " ";
369			}
370			tprints("]");
371		}
372		free(fds);
373		tprints(", ");
374		printtv_bitness(tcp, args[4], bitness, 0);
375	}
376	else {
377		static char outstr[1024];
378		char *outptr;
379#define end_outstr (outstr + sizeof(outstr))
380		int ready_fds;
381
382		if (syserror(tcp))
383			return 0;
384
385		ready_fds = tcp->u_rval;
386		if (ready_fds == 0) {
387			tcp->auxstr = "Timeout";
388			return RVAL_STR;
389		}
390
391		fds = malloc(fdsize);
392		if (!fds)
393			die_out_of_memory();
394
395		outptr = outstr;
396		sep = "";
397		for (i = 0; i < 3 && ready_fds > 0; i++) {
398			int first = 1;
399
400			arg = args[i+1];
401			if (!arg || umoven(tcp, arg, fdsize, (char *) fds) < 0)
402				continue;
403			for (j = 0;; j++) {
404				j = next_set_bit(fds, j, nfds);
405				if (j < 0)
406					break;
407				/* +2 chars needed at the end: ']',NUL */
408				if (outptr < end_outstr - (sizeof(", except [") + sizeof(int)*3 + 2)) {
409					if (first) {
410						outptr += sprintf(outptr, "%s%s [%u",
411							sep,
412							i == 0 ? "in" : i == 1 ? "out" : "except",
413							j
414						);
415						first = 0;
416						sep = ", ";
417					}
418					else {
419						outptr += sprintf(outptr, " %u", j);
420					}
421				}
422				if (--ready_fds == 0)
423					break;
424			}
425			if (outptr != outstr)
426				*outptr++ = ']';
427		}
428		free(fds);
429		/* This contains no useful information on SunOS.  */
430		if (args[4]) {
431			if (outptr < end_outstr - (10 + TIMEVAL_TEXT_BUFSIZE)) {
432				outptr += sprintf(outptr, "%sleft ", sep);
433				outptr = sprinttv(outptr, tcp, args[4], bitness, /*special:*/ 0);
434			}
435		}
436		*outptr = '\0';
437		tcp->auxstr = outstr;
438		return RVAL_STR;
439#undef end_outstr
440	}
441	return 0;
442}
443
444int
445sys_oldselect(struct tcb *tcp)
446{
447	long args[5];
448
449	if (umoven(tcp, tcp->u_arg[0], sizeof args, (char *) args) < 0) {
450		tprints("[...]");
451		return 0;
452	}
453	return decode_select(tcp, args, BITNESS_CURRENT);
454}
455
456#ifdef ALPHA
457int
458sys_osf_select(struct tcb *tcp)
459{
460	long *args = tcp->u_arg;
461	return decode_select(tcp, args, BITNESS_32);
462}
463#endif
464
465#include "xlat/epollctls.h"
466#include "xlat/epollevents.h"
467#include "xlat/epollflags.h"
468
469/* Not aliased to printargs_ld: we want it to have a distinct address */
470int
471sys_epoll_create(struct tcb *tcp)
472{
473	return printargs_ld(tcp);
474}
475
476int
477sys_epoll_create1(struct tcb *tcp)
478{
479	if (entering(tcp))
480		printflags(epollflags, tcp->u_arg[0], "EPOLL_???");
481	return 0;
482}
483
484#ifdef HAVE_SYS_EPOLL_H
485static void
486print_epoll_event(struct epoll_event *ev)
487{
488	tprints("{");
489	printflags(epollevents, ev->events, "EPOLL???");
490	/* We cannot know what format the program uses, so print u32 and u64
491	   which will cover every value.  */
492	tprintf(", {u32=%" PRIu32 ", u64=%" PRIu64 "}}",
493		ev->data.u32, ev->data.u64);
494}
495#endif
496
497int
498sys_epoll_ctl(struct tcb *tcp)
499{
500	if (entering(tcp)) {
501		printfd(tcp, tcp->u_arg[0]);
502		tprints(", ");
503		printxval(epollctls, tcp->u_arg[1], "EPOLL_CTL_???");
504		tprints(", ");
505		printfd(tcp, tcp->u_arg[2]);
506		tprints(", ");
507		if (tcp->u_arg[3] == 0)
508			tprints("NULL");
509		else {
510#ifdef HAVE_SYS_EPOLL_H
511			struct epoll_event ev;
512			if (
513#ifdef EPOLL_CTL_DEL
514			    (tcp->u_arg[1] != EPOLL_CTL_DEL) &&
515#endif
516			    umove(tcp, tcp->u_arg[3], &ev) == 0)
517				print_epoll_event(&ev);
518			else
519#endif
520				tprintf("%lx", tcp->u_arg[3]);
521		}
522	}
523	return 0;
524}
525
526static void
527epoll_wait_common(struct tcb *tcp)
528{
529	if (entering(tcp)) {
530		printfd(tcp, tcp->u_arg[0]);
531		tprints(", ");
532	} else {
533		if (syserror(tcp))
534			tprintf("%lx", tcp->u_arg[1]);
535		else if (tcp->u_rval == 0)
536			tprints("{}");
537		else {
538#ifdef HAVE_SYS_EPOLL_H
539			struct epoll_event ev, *start, *cur, *end;
540			int failed = 0;
541
542			tprints("{");
543			start = (struct epoll_event *) tcp->u_arg[1];
544			end = start + tcp->u_rval;
545			for (cur = start; cur < end; ++cur) {
546				if (cur > start)
547					tprints(", ");
548				if (umove(tcp, (long) cur, &ev) == 0)
549					print_epoll_event(&ev);
550				else {
551					tprints("?");
552					failed = 1;
553					break;
554				}
555			}
556			tprints("}");
557			if (failed)
558				tprintf(" %#lx", (long) start);
559#else
560			tprints("{...}");
561#endif
562		}
563		tprintf(", %d, %d", (int) tcp->u_arg[2], (int) tcp->u_arg[3]);
564	}
565}
566
567int
568sys_epoll_wait(struct tcb *tcp)
569{
570	epoll_wait_common(tcp);
571	return 0;
572}
573
574int
575sys_epoll_pwait(struct tcb *tcp)
576{
577	epoll_wait_common(tcp);
578	if (exiting(tcp)) {
579		tprints(", ");
580		/* NB: kernel requires arg[5] == NSIG / 8 */
581		print_sigset_addr_len(tcp, tcp->u_arg[4], tcp->u_arg[5]);
582		tprintf(", %lu", tcp->u_arg[5]);
583	}
584	return 0;
585}
586
587int
588sys_select(struct tcb *tcp)
589{
590	return decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
591}
592
593int
594sys_pselect6(struct tcb *tcp)
595{
596	int rc = decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
597	if (entering(tcp)) {
598		long r;
599		struct {
600			unsigned long ptr;
601			unsigned long len;
602		} data;
603#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
604		if (current_wordsize == 4) {
605			struct {
606				uint32_t ptr;
607				uint32_t len;
608			} data32;
609			r = umove(tcp, tcp->u_arg[5], &data32);
610			data.ptr = data32.ptr;
611			data.len = data32.len;
612		} else
613#endif
614			r = umove(tcp, tcp->u_arg[5], &data);
615		if (r < 0)
616			tprintf(", %#lx", tcp->u_arg[5]);
617		else {
618			tprints(", {");
619			/* NB: kernel requires data.len == NSIG / 8 */
620			print_sigset_addr_len(tcp, data.ptr, data.len);
621			tprintf(", %lu}", data.len);
622		}
623	}
624	return rc;
625}
626
627static int
628do_eventfd(struct tcb *tcp, int flags_arg)
629{
630	if (entering(tcp)) {
631		tprintf("%lu", tcp->u_arg[0]);
632		if (flags_arg >= 0) {
633			tprints(", ");
634			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
635		}
636	}
637	return 0;
638}
639
640int
641sys_eventfd(struct tcb *tcp)
642{
643	return do_eventfd(tcp, -1);
644}
645
646int
647sys_eventfd2(struct tcb *tcp)
648{
649	return do_eventfd(tcp, 1);
650}
651
652int
653sys_perf_event_open(struct tcb *tcp)
654{
655	if (entering(tcp)) {
656		tprintf("%#lx, %d, %d, %d, ",
657			tcp->u_arg[0],
658			(int) tcp->u_arg[1],
659			(int) tcp->u_arg[2],
660			(int) tcp->u_arg[3]);
661		printflags(perf_event_open_flags, tcp->u_arg[4],
662			   "PERF_FLAG_???");
663	}
664	return 0;
665}
666