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 MPERS_DEFS
37
38 #define D_NAME_LEN_MAX 256
39
40 static void
print_old_dirent(struct tcb * const tcp,const kernel_ulong_t addr)41 print_old_dirent(struct tcb *const tcp, const kernel_ulong_t addr)
42 {
43 kernel_dirent d;
44
45 if (umove_or_printaddr(tcp, addr, &d))
46 return;
47
48 tprintf("{d_ino=%llu, d_off=%llu, d_reclen=%u, d_name=",
49 zero_extend_signed_to_ull(d.d_ino),
50 zero_extend_signed_to_ull(d.d_off), d.d_reclen);
51 if (d.d_reclen > D_NAME_LEN_MAX)
52 d.d_reclen = D_NAME_LEN_MAX;
53 printpathn(tcp, addr + offsetof(kernel_dirent, d_name), d.d_reclen);
54 tprints("}");
55 }
56
SYS_FUNC(readdir)57 SYS_FUNC(readdir)
58 {
59 if (entering(tcp)) {
60 printfd(tcp, tcp->u_arg[0]);
61 tprints(", ");
62 } else {
63 if (tcp->u_rval == 0)
64 printaddr(tcp->u_arg[1]);
65 else
66 print_old_dirent(tcp, tcp->u_arg[1]);
67 /* Not much point in printing this out, it is always 1. */
68 if (tcp->u_arg[2] != 1)
69 tprintf(", %" PRI_klu, tcp->u_arg[2]);
70 }
71 return 0;
72 }
73
SYS_FUNC(getdents)74 SYS_FUNC(getdents)
75 {
76 unsigned int i, len, dents = 0;
77 unsigned char *buf;
78
79 if (entering(tcp)) {
80 printfd(tcp, tcp->u_arg[0]);
81 tprints(", ");
82 return 0;
83 }
84
85 const unsigned int count = tcp->u_arg[2];
86
87 if (syserror(tcp) || !verbose(tcp)) {
88 printaddr(tcp->u_arg[1]);
89 tprintf(", %u", count);
90 return 0;
91 }
92
93 /* Beware of insanely large or too small values in tcp->u_rval */
94 if (tcp->u_rval > 1024*1024)
95 len = 1024*1024;
96 else if (tcp->u_rval < (int) sizeof(kernel_dirent))
97 len = 0;
98 else
99 len = tcp->u_rval;
100
101 if (len) {
102 buf = malloc(len);
103 if (!buf || umoven(tcp, tcp->u_arg[1], len, buf) < 0) {
104 printaddr(tcp->u_arg[1]);
105 tprintf(", %u", count);
106 free(buf);
107 return 0;
108 }
109 } else {
110 buf = NULL;
111 }
112
113 if (!abbrev(tcp))
114 tprints("[");
115 for (i = 0; len && i <= len - sizeof(kernel_dirent); ) {
116 kernel_dirent *d = (kernel_dirent *) &buf[i];
117
118 if (!abbrev(tcp)) {
119 int oob = d->d_reclen < sizeof(kernel_dirent) ||
120 i + d->d_reclen - 1 >= len;
121 int d_name_len = oob ? len - i : d->d_reclen;
122 d_name_len -= offsetof(kernel_dirent, d_name) + 1;
123 if (d_name_len > D_NAME_LEN_MAX)
124 d_name_len = D_NAME_LEN_MAX;
125
126 tprintf("%s{d_ino=%llu, d_off=%llu, d_reclen=%u"
127 ", d_name=", i ? ", " : "",
128 zero_extend_signed_to_ull(d->d_ino),
129 zero_extend_signed_to_ull(d->d_off),
130 d->d_reclen);
131
132 if (print_quoted_string(d->d_name, d_name_len,
133 QUOTE_0_TERMINATED) > 0) {
134 tprints("...");
135 }
136
137 tprints(", d_type=");
138 if (oob)
139 tprints("?");
140 else
141 printxval(dirent_types, buf[i + d->d_reclen - 1], "DT_???");
142 tprints("}");
143 }
144 dents++;
145 if (d->d_reclen < sizeof(kernel_dirent)) {
146 tprints("/* d_reclen < sizeof(struct dirent) */");
147 break;
148 }
149 i += d->d_reclen;
150 }
151 if (!abbrev(tcp))
152 tprints("]");
153 else
154 tprintf("/* %u entries */", dents);
155 tprintf(", %u", count);
156 free(buf);
157 return 0;
158 }
159