1/*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * Copyright (c) 2015-2017 The strace developers.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "defs.h"
30
31#include "xlat/name_to_handle_at_flags.h"
32
33#ifndef MAX_HANDLE_SZ
34# define MAX_HANDLE_SZ 128
35#endif
36
37typedef struct {
38	unsigned int handle_bytes;
39	int handle_type;
40} file_handle_header;
41
42SYS_FUNC(name_to_handle_at)
43{
44	file_handle_header h;
45	const kernel_ulong_t addr = tcp->u_arg[2];
46
47	if (entering(tcp)) {
48		/* dirfd */
49		print_dirfd(tcp, tcp->u_arg[0]);
50
51		/* pathname */
52		printpath(tcp, tcp->u_arg[1]);
53		tprints(", ");
54
55		/* handle */
56		if (umove_or_printaddr(tcp, addr, &h)) {
57			tprints(", ");
58
59			/* mount_id */
60			printaddr(tcp->u_arg[3]);
61			tprints(", ");
62
63			/* flags */
64			printflags(name_to_handle_at_flags, tcp->u_arg[4],
65				   "AT_???");
66
67			return RVAL_DECODED;
68		}
69		tprintf("{handle_bytes=%u", h.handle_bytes);
70
71		set_tcb_priv_ulong(tcp, h.handle_bytes);
72
73		return 0;
74	} else {
75		unsigned int i = get_tcb_priv_ulong(tcp);
76
77		if ((!syserror(tcp) || EOVERFLOW == tcp->u_error)
78		    && !umove(tcp, addr, &h)) {
79			unsigned char f_handle[MAX_HANDLE_SZ];
80
81			if (i != h.handle_bytes)
82				tprintf(" => %u", h.handle_bytes);
83			if (!syserror(tcp)) {
84				tprintf(", handle_type=%d", h.handle_type);
85				if (h.handle_bytes > MAX_HANDLE_SZ)
86					h.handle_bytes = MAX_HANDLE_SZ;
87				if (!umoven(tcp, addr + sizeof(h), h.handle_bytes,
88					    f_handle)) {
89					tprints(", f_handle=0x");
90					for (i = 0; i < h.handle_bytes; ++i)
91						tprintf("%02x", f_handle[i]);
92				}
93			}
94		}
95		tprints("}, ");
96
97		/* mount_id */
98		printnum_int(tcp, tcp->u_arg[3], "%d");
99		tprints(", ");
100
101		/* flags */
102		printflags(name_to_handle_at_flags, tcp->u_arg[4], "AT_???");
103	}
104	return 0;
105}
106
107SYS_FUNC(open_by_handle_at)
108{
109	file_handle_header h;
110	const kernel_ulong_t addr = tcp->u_arg[1];
111
112	/* mount_fd */
113	printfd(tcp, tcp->u_arg[0]);
114	tprints(", ");
115
116	/* handle */
117	if (!umove_or_printaddr(tcp, addr, &h)) {
118		unsigned char f_handle[MAX_HANDLE_SZ];
119
120		tprintf("{handle_bytes=%u, handle_type=%d",
121			h.handle_bytes, h.handle_type);
122		if (h.handle_bytes > MAX_HANDLE_SZ)
123			h.handle_bytes = MAX_HANDLE_SZ;
124		if (!umoven(tcp, addr + sizeof(h), h.handle_bytes, &f_handle)) {
125			unsigned int i;
126
127			tprints(", f_handle=0x");
128			for (i = 0; i < h.handle_bytes; ++i)
129				tprintf("%02x", f_handle[i]);
130		}
131		tprints("}");
132	}
133	tprints(", ");
134
135	/* flags */
136	tprint_open_modes(tcp->u_arg[2]);
137
138	return RVAL_DECODED;
139}
140