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
42 static void
print_old_dirent(struct tcb * tcp,long addr)43 print_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
SYS_FUNC(readdir)59 SYS_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
SYS_FUNC(getdents)76 SYS_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