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 #include <dirent.h>
34
35 #include "xlat/dirent_types.h"
36
37 #define D_NAME_LEN_MAX 256
38
SYS_FUNC(getdents64)39 SYS_FUNC(getdents64)
40 {
41 /* the minimum size of a valid dirent64 structure */
42 const unsigned int d_name_offset = offsetof(struct dirent64, d_name);
43
44 unsigned int i, len, dents = 0;
45 char *buf;
46
47 if (entering(tcp)) {
48 printfd(tcp, tcp->u_arg[0]);
49 tprints(", ");
50 return 0;
51 }
52
53 const unsigned int count = tcp->u_arg[2];
54
55 if (syserror(tcp) || !verbose(tcp)) {
56 printaddr(tcp->u_arg[1]);
57 tprintf(", %u", count);
58 return 0;
59 }
60
61 /* Beware of insanely large or too small values in tcp->u_rval */
62 if (tcp->u_rval > 1024*1024)
63 len = 1024*1024;
64 else if (tcp->u_rval < (int) d_name_offset)
65 len = 0;
66 else
67 len = tcp->u_rval;
68
69 if (len) {
70 buf = malloc(len);
71 if (!buf || umoven(tcp, tcp->u_arg[1], len, buf) < 0) {
72 printaddr(tcp->u_arg[1]);
73 tprintf(", %u", count);
74 free(buf);
75 return 0;
76 }
77 } else {
78 buf = NULL;
79 }
80
81 if (!abbrev(tcp))
82 tprints("[");
83 for (i = 0; len && i <= len - d_name_offset; ) {
84 struct dirent64 *d = (struct dirent64 *) &buf[i];
85 if (!abbrev(tcp)) {
86 int d_name_len;
87 if (d->d_reclen >= d_name_offset
88 && i + d->d_reclen <= len) {
89 d_name_len = d->d_reclen - d_name_offset;
90 } else {
91 d_name_len = len - i - d_name_offset;
92 }
93 if (d_name_len > D_NAME_LEN_MAX)
94 d_name_len = D_NAME_LEN_MAX;
95
96 tprintf("%s{d_ino=%" PRIu64 ", d_off=%" PRId64
97 ", d_reclen=%u, d_type=",
98 i ? ", " : "",
99 d->d_ino,
100 d->d_off,
101 d->d_reclen);
102 printxval(dirent_types, d->d_type, "DT_???");
103
104 tprints(", d_name=");
105 if (print_quoted_string(d->d_name, d_name_len,
106 QUOTE_0_TERMINATED) > 0) {
107 tprints("...");
108 }
109
110 tprints("}");
111 }
112 if (d->d_reclen < d_name_offset) {
113 tprints("/* d_reclen < offsetof(struct dirent64, d_name) */");
114 break;
115 }
116 i += d->d_reclen;
117 dents++;
118 }
119 if (!abbrev(tcp))
120 tprints("]");
121 else
122 tprintf("/* %u entries */", dents);
123 tprintf(", %u", count);
124 free(buf);
125 return 0;
126 }
127