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) 2005-2015 Dmitry V. Levin <ldv@altlinux.org>
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "defs.h"
33
34#include DEF_MPERS_TYPE(kernel_dirent)
35
36#include "kernel_types.h"
37
38#include MPERS_DEFS
39
40#define D_NAME_LEN_MAX 256
41
42static void
43print_old_dirent(struct tcb *tcp, long addr)
44{
45	kernel_dirent d;
46
47	if (umove_or_printaddr(tcp, addr, &d))
48		return;
49
50	tprintf("{d_ino=%llu, d_off=%llu, d_reclen=%u, d_name=",
51		(unsigned long long) d.d_ino,
52		(unsigned long long) d.d_off, d.d_reclen);
53	if (d.d_reclen > D_NAME_LEN_MAX)
54		d.d_reclen = D_NAME_LEN_MAX;
55	printpathn(tcp, addr + offsetof(kernel_dirent, d_name), d.d_reclen);
56	tprints("}");
57}
58
59SYS_FUNC(readdir)
60{
61	if (entering(tcp)) {
62		printfd(tcp, tcp->u_arg[0]);
63		tprints(", ");
64	} else {
65		if (tcp->u_rval == 0)
66			printaddr(tcp->u_arg[1]);
67		else
68			print_old_dirent(tcp, tcp->u_arg[1]);
69		/* Not much point in printing this out, it is always 1. */
70		if (tcp->u_arg[2] != 1)
71			tprintf(", %lu", tcp->u_arg[2]);
72	}
73	return 0;
74}
75
76SYS_FUNC(getdents)
77{
78	unsigned int i, len, dents = 0;
79	char *buf;
80
81	if (entering(tcp)) {
82		printfd(tcp, tcp->u_arg[0]);
83		tprints(", ");
84		return 0;
85	}
86	if (syserror(tcp) || !verbose(tcp)) {
87		printaddr(tcp->u_arg[1]);
88		tprintf(", %lu", tcp->u_arg[2]);
89		return 0;
90	}
91
92	/* Beware of insanely large or too small values in tcp->u_rval */
93	if (tcp->u_rval > 1024*1024)
94		len = 1024*1024;
95	else if (tcp->u_rval < (int) sizeof(kernel_dirent))
96		len = 0;
97	else
98		len = tcp->u_rval;
99
100	if (len) {
101		buf = malloc(len);
102		if (!buf || umoven(tcp, tcp->u_arg[1], len, buf) < 0) {
103			printaddr(tcp->u_arg[1]);
104			tprintf(", %lu", tcp->u_arg[2]);
105			free(buf);
106			return 0;
107		}
108	} else {
109		buf = NULL;
110	}
111
112	if (!abbrev(tcp))
113		tprints("[");
114	for (i = 0; len && i <= len - sizeof(kernel_dirent); ) {
115		kernel_dirent *d = (kernel_dirent *) &buf[i];
116
117		if (!abbrev(tcp)) {
118			int oob = d->d_reclen < sizeof(kernel_dirent) ||
119				  i + d->d_reclen - 1 >= len;
120			int d_name_len = oob ? len - i : d->d_reclen;
121			d_name_len -= offsetof(kernel_dirent, d_name) + 1;
122			if (d_name_len > D_NAME_LEN_MAX)
123				d_name_len = D_NAME_LEN_MAX;
124
125			tprintf("%s{d_ino=%llu, d_off=%llu, d_reclen=%u"
126				", d_name=", i ? ", " : "",
127				(unsigned long long) d->d_ino,
128				(unsigned long long) d->d_off, d->d_reclen);
129
130			if (print_quoted_string(d->d_name, d_name_len,
131					        QUOTE_0_TERMINATED) > 0) {
132				tprints("...");
133			}
134
135			tprints(", d_type=");
136			if (oob)
137				tprints("?");
138			else
139				printxval(dirent_types, buf[i + d->d_reclen - 1], "DT_???");
140			tprints("}");
141		}
142		dents++;
143		if (d->d_reclen < sizeof(kernel_dirent)) {
144			tprints("/* d_reclen < sizeof(struct dirent) */");
145			break;
146		}
147		i += d->d_reclen;
148	}
149	if (!abbrev(tcp))
150		tprints("]");
151	else
152		tprintf("/* %u entries */", dents);
153	tprintf(", %lu", tcp->u_arg[2]);
154	free(buf);
155	return 0;
156}
157