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) 2005-2007 Roland McGrath <roland@redhat.com>
7 * Copyright (c) 2006-2007 Ulrich Drepper <drepper@redhat.com>
8 * Copyright (c) 2009-2013 Denys Vlasenko <dvlasenk@redhat.com>
9 * Copyright (c) 2005-2015 Dmitry V. Levin <ldv@altlinux.org>
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #include "defs.h"
36
37 #include <fcntl.h>
38
39 /* some libcs are guilty of messing up with O_ACCMODE */
40 #undef O_ACCMODE
41 #define O_ACCMODE 03
42
43 #ifdef O_LARGEFILE
44 # if O_LARGEFILE == 0 /* biarch platforms in 64-bit mode */
45 # undef O_LARGEFILE
46 # ifdef SPARC64
47 # define O_LARGEFILE 0x40000
48 # elif defined X86_64 || defined S390X
49 # define O_LARGEFILE 0100000
50 # endif
51 # endif
52 #endif
53
54 #include "xlat/open_access_modes.h"
55 #include "xlat/open_mode_flags.h"
56
57 #ifndef AT_FDCWD
58 # define AT_FDCWD -100
59 #endif
60
61 /* The fd is an "int", so when decoding x86 on x86_64, we need to force sign
62 * extension to get the right value. We do this by declaring fd as int here.
63 */
64 void
print_dirfd(struct tcb * tcp,int fd)65 print_dirfd(struct tcb *tcp, int fd)
66 {
67 if (fd == AT_FDCWD)
68 tprints("AT_FDCWD, ");
69 else {
70 printfd(tcp, fd);
71 tprints(", ");
72 }
73 }
74
75 /*
76 * low bits of the open(2) flags define access mode,
77 * other bits are real flags.
78 */
79 const char *
sprint_open_modes(unsigned int flags)80 sprint_open_modes(unsigned int flags)
81 {
82 static char outstr[(1 + ARRAY_SIZE(open_mode_flags)) * sizeof("O_LARGEFILE")];
83 char *p;
84 char sep;
85 const char *str;
86 const struct xlat *x;
87
88 sep = ' ';
89 p = stpcpy(outstr, "flags");
90 str = xlookup(open_access_modes, flags & 3);
91 if (str) {
92 *p++ = sep;
93 p = stpcpy(p, str);
94 flags &= ~3;
95 if (!flags)
96 return outstr;
97 sep = '|';
98 }
99
100 for (x = open_mode_flags; x->str; x++) {
101 if ((flags & x->val) == x->val) {
102 *p++ = sep;
103 p = stpcpy(p, x->str);
104 flags &= ~x->val;
105 if (!flags)
106 return outstr;
107 sep = '|';
108 }
109 }
110 /* flags is still nonzero */
111 *p++ = sep;
112 sprintf(p, "%#x", flags);
113 return outstr;
114 }
115
116 void
tprint_open_modes(unsigned int flags)117 tprint_open_modes(unsigned int flags)
118 {
119 tprints(sprint_open_modes(flags) + sizeof("flags"));
120 }
121
122 #ifdef O_TMPFILE
123 /* The kernel & C libraries often inline O_DIRECTORY. */
124 # define STRACE_O_TMPFILE (O_TMPFILE & ~O_DIRECTORY)
125 #else /* !O_TMPFILE */
126 # define STRACE_O_TMPFILE 0
127 #endif
128
129 static int
decode_open(struct tcb * tcp,int offset)130 decode_open(struct tcb *tcp, int offset)
131 {
132 printpath(tcp, tcp->u_arg[offset]);
133 tprints(", ");
134 /* flags */
135 tprint_open_modes(tcp->u_arg[offset + 1]);
136 if (tcp->u_arg[offset + 1] & (O_CREAT | STRACE_O_TMPFILE)) {
137 /* mode */
138 tprints(", ");
139 print_numeric_umode_t(tcp->u_arg[offset + 2]);
140 }
141
142 return RVAL_DECODED | RVAL_FD;
143 }
144
SYS_FUNC(open)145 SYS_FUNC(open)
146 {
147 return decode_open(tcp, 0);
148 }
149
SYS_FUNC(openat)150 SYS_FUNC(openat)
151 {
152 print_dirfd(tcp, tcp->u_arg[0]);
153 return decode_open(tcp, 1);
154 }
155
SYS_FUNC(creat)156 SYS_FUNC(creat)
157 {
158 printpath(tcp, tcp->u_arg[0]);
159 tprints(", ");
160 print_numeric_umode_t(tcp->u_arg[1]);
161
162 return RVAL_DECODED | RVAL_FD;
163 }
164